LG Electronics LMU421HHV LG Air Conditioner Cooling Area, User Manual

MULTI

MAX

MULTI

HEAT PUMP OUTDOOR UNIT

INSTALLATION MANUAL

Multi-Zone Heat Pump Systems

1.5 to 4.0 Tons

WITH

Dual-, Tri-, and Quad-Zone

Multi F

Up to Eight Zones

Multi F MAX

For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice.

PROPRIETARY DATA NOTICE

For more technical materials such as submittals, catalogs, engineering,

owner’s, best practices, building ventilation guide, and service manuals,

visit www.lghvac.com.

Do not throw away, destroy, or lose this manual.

Please read carefully and store in a safe place for future reference.

Content familiarity is required for proper installation.

The instructions included in this manual must be followed to prevent product malfunction, property damage, injury, or death to the user or

other people. Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the

symbols described by the summary list of safety precautions on page 4.

This document, as well as all reports, illustrations, data, information,

and other materials are the property of LG Electronics U.S.A., Inc., and are

disclosed by LG Electronics U.S.A., Inc. only in confidence.

Due to our policy of continuous product innovation, some specifications may change without notification.

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TABLE OF CONTENTS

Safety Instructions ...................................................................................................................................................................................................... 4-7

Nomenclature.................................................................................................................................................................................................................. 8

General Data .............................................................................................................................................................................................................. 9-16

Installation................................................................................................................................................................................................................ 17-30

Transporting / Lifting................................................................................................................................................................................................... 17

Placement Considerations..................................................................................................................................................................................... 18-27

Mounting / Anchoring............................................................................................................................................................................................. 28-30

General Refrigerant Piping System Information .................................................................................................................................................. 31-45

LG Air Conditioner Technical Solution (LATS) ....................................................................................................................................................... 31-32

Refrigerant Safety Standards / Device

Connection Limitations .......................................................................................................................................................................................... 33-34

Selecting Copper Piping............................................................................................................................................................................................. 35

Copper Expansion and Contraction....................................................................................................................................................................... 36-38

Piping Handling .......................................................................................................................................................................................................... 39

Refrigerant System Engineering............................................................................................................................................................................ 40-43

Flaring and Brazing Procedures............................................................................................................................................................................ 44-45

Refrigerant Piping System Installation.................................................................................................................................................................. 46-54

Refrigerant Piping Insulation ................................................................................................................................................................................. 55-57

Electrical System Installation................................................................................................................................................................................. 58-71

General Information.................................................................................................................................................................................................... 58

&RQQHFWLRQVDQG6SHFL¿FDWLRQV ............................................................................................................................................................................ 59-61

Installation ............................................................................................................................................................................................................. 62-71

Final Installation Procedures ................................................................................................................................................................................. 72-88

Triple Leak / Pressure Test .................................................................................................................................................................................... 72-73

Deep Evacuation Test............................................................................................................................................................................................ 73-74

Triple Evacuation Test............................................................................................................................................................................................ 74-75

Refrigerant Charge................................................................................................................................................................................................ 76-78

Cautions for Refrigerant Leaks.............................................................................................................................................................................. 79-80

Test Run ..................................................................................................................................................................................................................... 81

DIP Switch Settings for Optional Modes................................................................................................................................................................ 82-88

Error Codes.............................................................................................................................................................................................................. 89-91

LG Monitoring View (LGMV) Diagnostic Software ............................................................................................................................................... 92-93

Maintenance Recommendations................................................................................................................................................................................. 94

Installation Checklists and Worksheets.............................................................................................................................................................. 95-100

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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SAFETY INSTRUCTIONS

TABLE OF SYMBOLS

This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

This symbol indicates situations that may result in equipment or property damage accidents only.

This symbol indicates an action must not be completed.

DANGER

CAUTION

Do not install or remove the unit by yourself (end user).

Ask the dealer or an trained technician to install the unit.

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shock, physical injury or death.

For replacement of an installed unit, always contact an LG

trained service provider.

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death.

Wear protective gloves when handling equipment. Sharp

edges will cause personal injury.

Do not change the settings of the protection devices.

If the protection devices have been bypassed or is forced to operate

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Replace all control box and panel covers.

If cover panels are not installed securely, dust, water and animals will

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death.

Always check for system refrigerant leaks after the unit has

been installed or serviced.

Exposure to high concentration levels of refrigerant gas will lead to

illness or death.

Periodically check that the outdoor frame is not damaged.

There is a risk of explosion, physical injury, or death.

If the air conditioner is installed in a small space, take

measures to prevent the refrigerant concentration from

exceeding safety limits in the event of a refrigerant leak.

Consult the latest edition of ASHRAE (American Society of Heating,

Refrigerating, and Air Conditioning Engineers) Standard 15. If the

refrigerant leaks and safety limits are exceeded, it could result in person-

al injuries or death from oxygen depletion.

The branch distribution (BD) unit must be installed indoors;

do not install the BD unit in a highly humid environment.

There is risk of physical injury or death due to electric shock.

Dispose the packing materials safely.

• Packing materials, such as nails and other metal or wooden parts,

will cause puncture wounds or other injuries.

• Tear apart and throw away plastic packaging bags so that children

will not play with them and risk suffocation and death.

Install the unit considering the potential for strong winds or

earthquakes.

Improper installation will cause the unit to fall over, resulting in physical

injury or death.

Install the unit in a safe location where nobody can step, fall

onto it, or place objects on it.

Do not install the unit on a

defective stand.

It will result in an accident that causes physical injury or death.

Installation

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the unit.

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Do not supply power to the unit until all wiring and pip-

ing are completed or reconnected and checked.

There is risk of physical injury or death due to electric shock.

DANGER

The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incor-

rect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols described

below.

Safety Instructions

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SAFETY INSTRUCTIONS

CAUTION

Installation, continued

Be very careful when transporting the product. There is a risk of the product falling and causing physical injury.

• Use appropriate moving equipment to transport each frame; ensure the equipment is capable of supporting the weights listed.

• Some products use polypropylene bands for packaging.

Do not use polypropylene bands to lift the unit.

• Support the outdoor unit a minimum of four points to avoid slippage from rigging apparatus.

LG Electronics U.S.A.,Inc., is not responsible for any piping

calculations, refrigerant leaks, degradation of performance,

or any other potential problems or damages as a result of

interconnecting piping, their joint connections, isolation

valves, introduced debris inside the piping system, or other

problems caused by the interconnecting piping system.

Do not install the product where it is exposed directly to

ocean winds.

Sea salt in the air will cause the product to corrode. Corrosion, par-

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PDOIXQFWLRQRULQHI¿FLHQWRSHUDWLRQ

When installing the outdoor unit in a low-lying area, or a lo-

cation that is not level, use a raised concrete pad or concrete

blocks to provide a solid, level foundation.

This prevents water damage and abnormal vibration.

Properly insulate all cold surfaces to prevent “sweating.”

Cold surfaces such as uninsulated piping can generate condensate that

will drip and cause water damage to walls.

Always check for system refrigerant leaks after the unit has

been installed or serviced.

Low refrigerant levels will cause product failure.

The branch distribution (BD) unit must be installed indoors;

Do not install the BD box in a highly humid environment.

There is risk of product failure and property damage.

Do not make refrigerant substitutions. Use R410A only.

If a different refrigerant is used, or air mixes with original refrigerant, the

unit will malfunction and be damaged.

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the unit.

There is a risk of product failure.

Do not use the product for mission critical or special pur-

pose applications such as preserving foods, works of art, or

other precision air conditioning applications. The equipment

is designed to provide comfort cooling and heating.

There is risk of property damage.

Keep the unit upright during installation to avoid vibration or

water leakage.

When connecting refrigerant tubing, remember to allow for

pipe expansion.

Improper piping will cause refrigerant leaks and system malfunction.

Do not install the outdoor unit or BD unit in a noise-sen-

sitive area.

Take appropriate actions at the end of HVAC equipment life

to recover, recycle, reclaim or destroy R410A refrigerant

according to applicable U.S. Environmental Protection

Agency (EPA) rules.

Periodically check that the outdoor frame is not damaged.

There is a risk of equipment damage.

Install the unit in a safe location where nobody can step on

or fall onto it.

Do not install the unit on a defective stand.

There is a risk of unit and property damage.

Install the drain hose to ensure adequate drainage.

There is a risk of water leakage and property damage.

Properly insulate all cold surfaces to prevent “sweating.”

Cold surfaces such as uninsulated piping can generate condensate that could drip, causing a slippery surface that creates a risk of slipping, falling,

and personal injury.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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SAFETY INSTRUCTIONS

Do not supply power to the unit until all electrical wiring,

controls wiring, piping, installation, and refrigerant system

evacuation are completed.

System will malfunction.

The information contained in this manual is intended for use

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familiar with the U.S. National Electric Code (NEC) who is

equipped with the proper tools and test instruments.

Failure to carefully read and follow all instructions in this manual can

result in equipment malfunction and / or property damage.

The information contained in this manual is intended for use

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familiar with the U.S. National Electric Code (NEC) who is

equipped with the proper tools and test instruments.

Failure to carefully read and follow all instructions in this manual can

result in personal injury or death.

All electric work must be performed by a licensed electrician

and conform to local building codes or, in the absence of

local codes, with the National Electrical Code, and the

instructions given in this manual.

If the power source capacity is inadequate or the electric work is not

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death.

Refer to local, state, and federal codes, and use power wires

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strain relief.

Improperly securing wires will create undue stress on equipment power

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cal injury or death.

Ensure the system is connected to a dedicated power source

that provides adequate power.

If the power source capacity is inadequate or the electric work is not

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death.

Properly tighten all power connections.

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injury or death.

Do not change the settings of the protection devices.

If the protection devices have been bypassed or are forced to operate

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Wiring

DANGER

High voltage electricity is required to operate this system.

Adhere to the NEC code and these instructions when wiring.

Improper connections and inadequate grounding can cause accidental

injury or death.

Always ground the unit following local, state, and NEC codes.

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the equipment.

Electrical shock can cause physical injury or death.

Properly size all circuit breakers or fuses.

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Do not share the electrical circuit with other appliances.

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heat generation.

Do not use damaged or loose power wiring. Do not

randomly modify or extend the outdoor unit’s power wiring.

Ensure that the power wiring will not be pulled nor weight be

placed on the power wiring during operation.

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Safety Instructions

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Do not allow water, dirt, or animals to enter the unit.

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Do not operate the unit with the panel(s) or protective

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moving parts.

The rotating, hot, cold, and high-voltage parts of the unit can cause

physical injury or death.

Do not touch the refrigerant piping during or after

operation.

It can cause burns or frostbite.

Do not open the inlet during operation.

There is risk of electric shock, physical injury or death.

Operation

DANGER

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or submerged.

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Use a dedicated breaker for this product.

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Do not operate the disconnect switch with wet hands.

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Periodically verify the equipment mounts have not

deteriorated.

If the base collapses, the unit could fall and cause physical injury or

death.

Use inert (nitrogen) gas when performing leak tests or air

purges.

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ble gases.

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death.

If refrigerant leaks out, ventilate the area before operating the

unit.

If the unit is mounted in an enclosed, low-lying, or poorly ventilated area,

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shock, explosion, physical injury or death.

To avoid physical injury, use caution when cleaning or servicing the air conditioner.

There is risk of electric shock, physical injury or death.

CAUTION

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no metal scraps, screws, or bits of wiring have been left

inside or surrounding the unit.

Do not use the product for mission critical or special pur-

pose applications such as preserving foods, works of art, or

other precision air conditioning applications. The equipment

is designed to provide comfort cooling and heating.

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of the unit, or damage its parts.

Do not block the inlet or outlet.

Unit will malfunction.

Do not allow water, dirt, or animals to enter the unit.

There is risk of unit failure.

Do not open the inlet during operation.

There is risk of unit failure.

Do not operate the unit when the panel(s) or protective

cover(s) are removed.

Non-secured covers can result in product malfunction due to dust or

water in the service panel.

Periodically verify the equipment mounts have not

deteriorated.

If the base collapses, the unit could fall and cause property damage or

product failure.

Use a only soft cloth to clean the air conditioner. Do not

use wax, thinner, or strong detergents.

Strong cleaning products will damage the surface of the air conditioner,

or will cause its appearance to deteriorate.

SAFETY INSTRUCTIONS

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MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

Multi-Zone Systems — Indoor Units and Outdoor Units

CN 07 8 HV

Generation

Features:

H = Heat Pump

HH = High Heat

V = Inverter

T = High Wall-Mounted Indoor Unit

P = Art Cool Gallery Indoor Unit

Nominal Capacity

(Nominal cooling capacity in Btu/h):

Component:

AN: Art Cool™ Wall-Mounted Indoor Unit

N: Standard Wall-Mounted Indoor Unit

CN: Four-Way Ceiling-Cassette Indoor Unit

DN: Ceiling-Concealed Duct (Low Static) Indoor Unit

HN: Ceiling-Concealed Duct (High Static) Indoor Unit

QN: Low-Wall Console Indoor Unit

VN: Vertical-Horizontal Air Handling Indoor Unit

U: Outdoor Unit

L = LG

07 = 7,000

09 = 9,000

12 = 12,000

15 = 15,000

18 = 18,000

24 = 24,000

30 = 30,000

36 = 36,000

42 = 42,000

48 = 48,000

54 = 54,000

Type: M = Multi-Zone

• Voltage for all equipment is 208-230V, 60 Hz, 1-phase.

• All indoor units are compatible with wired controllers.

• All outdoor units are LGAP control network compatible with PI-485 V-net Control Integration Board (PMNFP14A1, sold separately).

• Compatible single zone IDU nomenclature is listed in the Single Zone Wall-Mounted IDU Engineering Manual.

Branch Distribution Units

BD 36

BD: Branch Distribution Unit

P = Part (Accessory)

Type: M = Multi-Zone

Family

Number of Port Connections

(Maximum Number of Connectible Indoor Units): 2, 3, 4

Generation: 0, 1

UNIT NOMENCLATURE

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Product Data

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GENERAL DATA

0XOWL)ZLWK/*5('2XWGRRU8QLW6SHFL¿FDWLRQV

Model Number LMU180HHV LMU240HHV LMU300HHV

Capacity

Nominal 18,000 24,000 30,000

Cooling (Btu/h) (Min.~Rated~ Max.)

8,400 ~ 18,000 ~ 19,980 8,400 ~ 24,000 ~ 30,000 8,400 ~ 28,400 ~ 34,080

Cooling Power Input (kW) (Min.~Rated~ Max.) 0.88 ~ 1.33 ~ 1.87 0.94 ~ 1.78 ~ 2.49 0.95 ~ 2.27 ~ 3.18

Cooling Running Current (A) (Min.~Rated~ Max.) 4.0 ~ 6.0 ~ 8.5 4.3 ~ 8.1 ~ 11.3 4.3 ~ 10.3 ~ 14.5

Heating (Btu/h) (Min.~Rated~ Max.)

10,248~22,000~24,000 10,248~26,000~31,200 10,248~28,600~34,320

Heating Power Input (kW) (Min.~Rated~ Max.) 1.25 ~ 2.22 ~ 3.11 1.26 ~ 2.12 ~ 2.96 1.30 ~ 2.33 ~ 3.26

Heating Running Current (A) (Min.~Rated~ Max.) 5.7 ~ 10.1 ~ 14.1 5.7 ~ 9.6 ~ 13.5 5.9 ~ 10.6 ~ 14.8

Operating Range

Cooling (°F DB)

14 to +118

Heating (°F WB) -13 to +64

Compressor

Inverter Quantity Twin Rotary x 1

Oil / Type FVC68D

Fan (Side Discharge)

Type Propeller

Motor Output (W) x Qty. 124.2 x 1

Motor / Drive Brushless Digitally Controlled / Direct

Maximum Air Flow Rate (ft.

/ min.) 2,295

Unit Data

Refrigerant Type R410A

Refrigerant Control / Location Electronic Expansion Valve / Outdoor Unit

Min. Number Indoor Units/System

222

Max. Number Indoor Units/System

234

Maximum Allowable Total Indoor Unit Connected Capacity (Btu/h) 24,000 33,000 40,000

Sound Pressure ±3 dB(A) (Cooling / Heating) dB(A)

50 / 54 52 / 55 52 / 55

Dimensions (W x H x D [inch]) 37-13/32 x 32-27/32 x 13

Net Unit Weight (lbs.) 147.7 152.1 152.1

Power Supply (V, Phase, Hz) 208 / 230V, 1, 60

Communication / Connection (Power) Cable (No. x AWG)

5,6

4C x 14

Heat Exchanger

Material and Fin Coating Copper Tube/Aluminum Fin and GoldFin™ / Hydrophilic

Rows/Columns / Fins per inch x Qty. (3 x 38 x 16) x 1

Piping

Liquid Line Connection (in., O.D.) x Qty. Ø1/4 x 2 Ø1/4 x 3 Ø1/4 x 4

Vapor Line Connection (in., O.D.) x Qty. Ø3/8 x 2 Ø3/8 x 3 Ø3/8 x 4

Factory Charge oz. of R410A 98.8 112.8

Additional Charging Volume (oz. / ft.) 0.22

Piping Lengths

Maximum Total Piping (ft.)

164 246.1

Maximum Outdoor Unit to Indoor Unit Piping (ft.) 82.0

Piping Length (No Additional Refrigerant [ft.]) 49.2 73.8 98.4

Maximum Elevation between Outdoor Unit and Indoor Unit (ft.) 49.2

Maximum Elevation between Indoor Unit and Indoor Unit (ft.) 24.6

Table 1: 0XOWL)ZLWK/*5('2XWGRRU8QLW6SHFL¿FDWLRQV

Capacity is rated with non-ducted IDUs, 0 ft. above sea level, with a 0 ft. level difference

between ODU and IDUs, and the following refrigerant pipe lengths:

LMU180HHV: 16.4 ft. x 2 = 32.8 ft.

LMU240HHV: 16.4 ft. x 3 = 49.2 ft.

LMU300HHV: 16.4 ft. x 4 = 65.6 ft.

All capacities are net with a combination ratio between 95 – 105%.

Rated cooling capacity obtained with air entering the indoor unit at 80ºF dry bulb (DB) and

67ºF wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet

bulb (WB).

Rated heating capacity obtained with air entering the indoor unit at 70ºF dry bulb (DB) and

60ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet

bulb (WB).

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At least two indoor units must be connected. For allocated capacity information, see the

combination tables in the "Multi F / Multi F MAX with LGRED Combination Data Manual" on

www.lghvac.com. For performance data, see "Multi F / Multi F MAX with LGRED Perfor-

mance Data Manual" on www.lghvac.com.

Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745 and

are the same in both cooling and heating mode. These values can increase due to ambient

conditions during operation.

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with all the applicable local and national codes. For detailed information, please refer to

electrical characteristics on page 10.

Communication / connection (power) cable from the outdoor units to the indoor units must

be a minimum of 14 AWG, 4-conductor stranded, shielded or unshielded (if shielded, it

must be grounded to the chassis of the outdoor unit only), and must comply with applicable

local and national codes. For detailed electrical information, please refer to electric charac-

teristics on page 10.

Piping lengths are equivalent.

MULTI

MAX

MULTI

WITH

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

GENERAL DATA

Multi F with LGRED Outdoor Unit Electrical Data

Table 2: Multi F with LGRED Electrical Data.

Nominal

Tons

Unit Model

No.

Hertz Voltage

Voltage Range

(Min. to Max.)

MCA MOP RFA

Compressor

Quantity

Compressor

Motor RLA

Outdoor Unit Fan

Motor

Indoor Unit

Fan Motor

kW FLA FLA

1.5 LMU180HHV

60 208 - 230 187 - 253

18.6 30 25 1 13 0.12 0.73 1.6

2 LMU240HHV 19 30 25 1 13 0.12 0.73 2.0

2.5 LMU300HHV 19.4 30 25 1 13 0.12 0.73 2.4

Voltage tolerance is ±10%.

Maximum allowable voltage unbalance is 2%.

MCA = Minimum Circuit Ampacity.

Maximum Overcurrent Protection (MOP) is calculated as

follows: (Largest motor FLA x 2.25) + (Sum of other motor

FLA) rounded down to the nearest standard fuse size.

RFA = Recommended Fuse Amps.

RLA = Rated Load Amps.

FLA = Full Load Amps.

Indoor Fan Motor (FLA) is based on the max. combination

of IDUs.

The maximum combination for each outdoor unit is:

- 18,000 ODU (LMU180HHV): 12,000 IDU x 2

- 24,000 ODU (LMU240HHV): 12,000 IDU x 2 + 9,000 IDU

x 1

- 30,000 ODU (LMU300HHV): 12,000 IDU x 3

MULTI

MAX

MULTI

WITH

Product Data

Due to our policy of continuous product innovation, some specifications may change without notification.

Multi F with LGRED Outdoor Unit Dimensions

GENERAL DATA

Figure 1: LMU180HHV, LMU240HHV, and LMU300HHV External Dimensions.

Gas pipe connection

Part Name

Air discharge grille

Liquid pipe connection

Main service valve (Gas)

Main service valve (Liquid)

No.

Unit: Inch

Gravity point

MULTI

MAX

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WITH

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

GENERAL DATA

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Capacity is rated with non-ducted IDUs, 0 ft. above sea level, with a 0 ft. level difference

between ODU and IDUs, and the following refrigerant pipe lengths:

LMU361HHV: 16.4 ft. Main + (16.4 ft. Branch x 5) = 98.4 ft.

LMU421HHV: 16.4 ft. Main + (16.4 ft. Branch x 6) = 114.8 ft.

LMU480HHV: 16.4 ft. Main + (16.4 ft. Branch x 8) = 147.6 ft.

All capacities are net with a combination ratio between 95 – 105%.

Rated cooling capacity obtained with air entering the indoor unit at 80ºF dry bulb (DB) and 67ºF wet

bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and 75ºF wet bulb (WB).

Rated heating capacity obtained with air entering the indoor unit at 70ºF dry bulb (DB) and 60ºF wet

bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).

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At least one Branch Distribution Unit is required for system operation; a maximum of two can be

installed per outdoor unit with use of Y-branch accessory (PMBL5620). At least two indoor units must be

connected. For allocated capacity information, see the combination tables in the “Multi F / Multi F MAX

with LGRED Combination Data Manual” on www.lghvac.com. For performance data, see “Multi F / Multi

F MAX with LGRED Performance Data Manual” on www.lghvac.com.

Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745. These values can

increase due to ambient conditions during operation.

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ble local and national codes. For detailed information, please refer to electrical characteristics on page

13.

Communications / connection (power) cable must be a minimum of 14 AWG, 4-conductor from the

outdoor unit to the BD unit, and 14 AWG, 4-conductor from the BD unit to the indoor unit, stranded,

shielded or unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only), and

must comply with applicable local and national codes. For detailed electrical information, please refer to

electric characteristics on page 13.

Piping lengths are equivalent.

Model Number LMU361HHV LMU421HHV LMU480HHV

Capacity

Cooling (Btu/h) (Min.~Rated~ Max.)

10,800~36,000~47,000 10,800~42,000~53,000 10,800~48,000~58,000

Cooling Power Input (kW) (Min.~Rated~ Max.) 0.64~2.48~4.07 0.64~3.04~4.71 0.64~3.66~5.17

Cooling Running Current (A) (Min.~Rated~ Max.) 2.9~11.2~18.5 2.9~13.8~21.3 2.9~16.6~23.4

Heating (Btu/h) (Min.~Rated~ Max.)

12,420~45,000~50,000 12,420~48,000~54,500 12,420~52,500~59,000

Heating Power Input (kW) (Min.~Rated~ Max.) 0.71~3.30~4.31 0.71~3.70~4.70 0.71~4.25~5.09

Heating Running Current (A) (Min.~Rated~ Max.) 3.2~14.9~19.5 3.2~16.8~21.3 3.2~20.0~23.0

Operating Range

Cooling (°F DB)

14 to 118

Heating (°F WB) -13 to +64

Compressor

Inverter Quantity R1 Scroll x 1

Oil / Type FVC68D

Fan (Side Discharge)

Type Propeller

Motor Output (W) x Qty. 124.2 x 2

Motor / Drive Brushless Digitally Controlled / Direct

Maximum Air Flow Rate (CFM) 2,119 x 2

Unit Data

Refrigerant Type R410A

Refrigerant Control / Location Electronic Expansion Valve / Outdoor Unit

Minimum ~ Maximum Number Indoor Units / System

2~5 2~6 2~8

Max. Number of Branch Distribution Units 2

Min. ~ Max. Allowable Total Indoor Unit Connected Capacity (Btu/h) 18,000 ~ 48,000 18,000 ~ 56,000 18,000 ~ 65,000

Sound Pressure ±3 dB(A) (Cooling / Heating)

53 / 55 54 / 56

Dimensions (W x H x D [inch]) 37-13/32 x 54-11/32 x 13

Net / Shipping Unit Weight (lbs.) 218 / 243

Power Supply (V, Phase, Hz) 208 / 230V, 1, 60

Comm./Conn. (Power) Cable from ODU & BDU/BDU & IDU (No. X AWG)

5,6

4C x 14 / 4C x 14

Heat Exchanger

Material and Fin Coating Copper Tube / Aluminum Fin and GoldFin™ / Hydrophilic

Rows/Columns / Fins per inch x Qty. (2 x 32 x 14) x 2, (1 x 32 x 14) x 2

Piping

Liquid Line Connection (in., O.D.) x Qty. Ø3/8 x 1

Vapor Line Connection (in., O.D.) x Qty. Ø3/4 x 1

Factory Charge oz. of R410A 183.4

Additional Charging Volume (oz. / ft.)

Main Pipe 0.54

Branch Pipe 0.22

Piping Lengths

Maximum Total Piping (ft.)

475.7

Maximum Piping Length (No Additional Refrigerant [ft.]) 49.2 ft. of Main Piping + 131.2 ft. of Branch Piping

Maximum Main Pipe Length (ODU to BDU [ft.]) 180.4

Total Branch Piping (BDU to all IDU [ft.]) 295.3

Maximum Branch Pipe Length (Length between each BDU & IDU [ft.]) 49.2

Maximum Outdoor Unit to IDU Pipe Length (ft.) 229.6

Maximum Elevation between ODU and IDU (ft.) 98.4

Maximum Elevation between Indoor Unit and Indoor Unit (ft.) 49.2

Maximum Elevation between BDU and IDU (ft.) 32.8

Maximum Elevation between BDU and BDU (ft.) 49.2

MULTI

MAX

MULTI

WITH

Product Data

Due to our policy of continuous product innovation, some specifications may change without notification.

Table 4: Multi F MAX with LGRED Electrical Data.

GENERAL DATA

Multi F MAX with LGRED Outdoor Unit Electrical Data

Voltage tolerance is ±10%.

Maximum allowable voltage unbalance is 2%.

MCA = Minimum Circuit Ampacity.

Maximum Overcurrent Protection (MOP) is calculated as

follows: (Largest motor FLA x 2.25) + (Sum of other motor

FLA) rounded down to the nearest standard fuse size.

RLA = Rated Load Amps.

FLA = Full Load Amps.

Indoor Fan Motor (FLA) is based on the max. combination

of IDUs.

Nominal

Tons

Unit Model

No.

Phase Hertz Voltage

Voltage

Range

(Min. to Max.)

MCA MOP

Compressor

Quantity

Compressor

Motor RLA

Outdoor Unit Fan

Motor(s)

Indoor

Unit Fan

Motor

kW x Qty. FLA x Qty. FLA

3.0 LMU361HHV

1 60 208 -230 187 - 253

32.7 40 1 22.0 0.12 x 2 1.60 x 2 3.6

3.5 LMU421HHV 32.7 40 1 22.0 0.12 x 2 1.60 x 2 4.2

4.0 LMU480HHV 32.7 40 1 22.0 0.12 x 2 1.60 x 2 4.9

MULTI

MAX

MULTI

WITH

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

Multi F with LGRED Outdoor Unit Dimensions

GENERAL DATA

Figure 2: LMU361HHV, LMU421HHV, and LMU480HHV External Dimensions.

Chassis code : U60A-B

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1. Unit must be installed in compliance with the installation manual.

2. Unit must be grounded in accordance with the local or state

regulations and applicable national codes.

3. All field-supplied electrical components and materials must comply

with local, state, and national codes.

4. Electrical characteristics must be considered for electrical

work and design. The capacity of power cable and circuit

breaker for the outdoor unit must follow local, state, national,

and manufacturer requirements.

Notes:

Handle

Liquid Pipe

Connection

(Flare)

Handle

Vapor Pipe

Connection

(Flare)

Power Wiring /

Communication

Cable Access

Holes

Air Outlet

MULTI

MAX

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WITH

Product Data

Due to our policy of continuous product innovation, some specifications may change without notification.

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GENERAL DATA

Table 5: Branch Distribution Unit General Data.

At least one branch distribution Unit is required for system operation; a maximum of two can be installed per outdoor unit with use of Y-branch accessory (PMBL5620) To connect only

one (1) indoor unit to a branch distribution unit, the system must include another branch distribution unit with at least one (1) connected indoor unit.

Branch distribution unit can accommodate from one (1) indoor unit up to four (4) indoor units depending on the ports available on the branch distribution unit.

All communication / power (connection) cable must be a minimum of 14 AWG, 4-conductor from the outdoor unit to the branch distribution unit (Multi F MAX with LGRED systems only),

and 14 AWG, 4-conductor from the branch distribution unit to the indoor unit, stranded, shielded or unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only),

and must comply with applicable local and national codes.

Piping lengths are equivalent.

Model Number PMBD3620 PMBD3630 PMBD3640 PMBD3641

No. of Connectible Indoor Units

1-2 1-3 1-4 1-4

Max. Nominal Capacity / Port (Btu/h)

24,000 24,000 24,000

Ports A, B, C: 24,000;

Port D: 36,000

Connected Indoor Unit Capacity (Btu/h) 7,000 ~ 24,000 7,000 ~ 24,000 7,000 ~ 24,000

Ports A, B, C: 7,000 ~ 24,000;

Port D: 24,000 or 36,000

Max. Nominal Capacity / Branch Distribution

Unit (Btu/h)

48,000 72,000 73,000 73,000

Operation Temperature Range (°F DB) 0 ~ 150 0 ~ 150 0 ~ 150 0 ~ 150

Maximum Humidity 80% 80% 80% 80%

Unit Data

Refrigerant Type R410A R410A R410A R410A

Power Supply V, Ø, Hz 208-230, 1, 60 208-230, 1, 60 208-230, 1, 60 208-230, 1, 60

Power Input (W) 16 24 32 32

Rated Amps (A) 0.08 0.12 0.16 0.16

Dimensions W x H x D (in.)

17-3/32 x 6-13/32

x 10-23/32

17-3/32 x 6-13/32

x 10-23/32

17-3/32 x 6-13/32

x 10-23/32

17-3/32 x 6-13/32 x 10-23/32

Net Unit Weight (lbs.) 13 14.3 15.7 15.7

Shipping Weight (lbs.) 15 17 18 18

Communication / Connection (Power) Cables

From Outdoor Unit to Branch Distribution Unit

(Qty. x AWG)

4C x 14 4C x 14 4C x 14 4C x 14

From Branch Distribution Unit to Indoor Unit

(Qty. x AWG)

4C x 14 4C x 14 4C x 14 4C x 14

Piping Connections

Outdoor Unit to

BDU

Liquid (in., OD) Ø3/8 Ø3/8 Ø3/8 Ø3/8

Vapor (in., OD) Ø3/4 Ø3/4 Ø3/4 Ø3/4

BDU to Indoor

Units

Liquid (in., OD) x Qty. Ø1/4 x 2 Ø1/4 x 3 Ø1/4 x 4 Ø1/4 x 4

Vapor (in., OD) x Qty. Ø3/8 x 2 Ø3/8 x 3 Ø3/8 x 4 Ø3/8 x 3; Ø1/2 x 1

Piping Lengths

Maximum Total System Piping (ft.)

475.7 475.7 475.7 475.7

Maximum Main Pipe Length (Outdoor Unit

to Branch Distribution Units [ft.])

180.4 180.4 180.4 180.4

Total Branch Piping (Branch Distribution Units

to Indoor Units [ft.])

295.3 295.3 295.3 295.3

Maximum Branch Pipe Length Between Branch

Distribution Unit and Each Indoor Unit [ft.])

49.2 49.2 49.2 49.2

Maximum Outdoor Unit to Indoor Unit

Pipe Length (ft.)

229.6 229.6 229.6 229.6

Piping Length (No Additional Refrigerant [ft.];

approx. 49.2 ft. of Main Piping + 131.2 ft. of

Branch Piping)

180.4 180.4 180.4 180.4

Maximum Elevation between Branch

Distribution Unit and Indoor Unit (ft.)

32.8 32.8 32.8 32.8

Maximum Elevation between Branch

Distribution Unit and Branch Distribution Unit (ft.)

49.2 49.2 49.2 49.2

MULTI

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MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

Branch Distribution Unit Dimensions

GENERAL DATA

Figure 3: PMBD3620, PMBD3630, PMBD3640, and PMBD3641 External Dimensions.

Mininum 1-3/16

Mininum 3-15/16

Minimum 15-3/4

Branch Pipe

6-5/16

Cover Control

Main Pipe

Service Space

EEV Service

Controller Service

Inspection Opening

Minimum 12

11-23/32

9-27/32

Ø3/4

Ø3/8

Suspension Bolt Pitch

9-21/32

13-9/32

Indoor Unit

Piping Direction

Unit: Inch

Minimum 24

Bottom View

Minimum 15-3/4Mininum 15-3/4

Side View

5-29/32

2-27/32

11-13/16

2-3/8

1-3/16

1-31/32

4-3/8

A-C (and PMBD3640 D) Connections:

Liquid Pipe Ø1/4

Gas Pipe Ø3/8

PMBD3641 D Connections:

Liquid Pipe Ø1/4

Gas Pipe Ø1/2

Notes:

1. For PMBD3620 Unit, Ports A and B are Available.

2. For PMBD3630 Unit, Ports A, B, and C are Available.

3. For PMBD3640 and PMBD3641 Units, Ports A, B, C, and D are Available.

ABCD

1-1/2 1-31/32

1-23/32

1-31/32

2-7/32

Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

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Unit

• At the time of delivery, the package must be checked for any dam-

age (exterior and interior). Report any damage to the carrier claims

agent immediately.

• When lifting the unit, use lifting straps and place properly around

the unit.

• Always lift the unit using properly sized lifting straps rated to carry

the unit weight.

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angle.

Capacity (ton)

Shipping Weight

(lbs.)

Net Weight (lbs.)

1.5 163.1 147.7

165.3 152.1

2.5

243 2183.5

Table 6: Multi F / Multi F MAX with LGRED Shipping and Net Weights.

Be very careful when transporting the product. There is a risk of the product falling and causing physical injury.

• Use appropriate moving equipment to transport each frame; ensure the equipment is capable of supporting the weights listed above. If the

equipment is not properly secured, it will result in an accident that causes physical injury or death.

• Wear protective gloves when handling equipment. Sharp edges will cause personal injury.

• Dispose the packing materials safely. Packing materials, such as nails and other metal or wooden parts, will cause puncture wounds or

other injuries.

• Tear apart and throw away plastic packaging bags so that children will not play with them and risk suffocation and death.

• Use caution when using a forklift to transport an unpackaged unit. The forklift arms must pass through the openings at the bottom.

not drop the unit when carrying it with a forklift. There is a risk of the product falling and causing physical injury.

• Consider the unit’s center of gravity before lifting. Hoist the unit with the center of gravity centered among the lifting straps. There is a risk of

the product falling and causing physical injury.

• Some products include polypropylene bands around the unit for packaging.

Do not use polypropylene bands to lift the unit. There is a

risk of the product falling and causing physical injury.

• Lift the outdoor unit from the base at specified locations. Support the outdoor unit at a minimum of four (4) points to avoid slippage from the

rigging apparatus. There is a risk of the product falling and causing physical injury.

• If a crane is to suspend the outdoor unit, it is recommended that two (2) ropes at least twenty-three (23) feet in length be used.

• Pass the ropes under the unit. Pass the rope through the two (2) forklift slots each at the front and rear of the outdoor unit.

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• Make sure the outdoor unit is in its original packaging to avoid damage during local transport.

• Handle the outdoor unit with care. Keep the outdoor unit upright to avoid damaging inside components.

• When lifting, always include padding to protect the outdoor unit from rope damage.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

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Selecting the Best Location for the Outdoor Unit

DANGER

• Do not install the unit in an area where combustible gas will generate, flow, stagnate, or leak. These conditions can cause a fire, result-

ing in bodily injury or death.

•

Do not install the unit in a location where acidic solution and spray (sulfur) are often used as it can cause bodily injury or death.

• Do not use the unit in environments where oil, steam, or sulfuric gas are present as it can cause bodily injury or death.

When deciding on a location to place the outdoor unit, be sure to choose an area where run-off from defrost will not accumulate and freeze on

sidewalks or driveways, which will create unsafe conditions. Properly install and insulate any drain hoses to prevent the hose from freezing, cracking,

leaking, and causing unsafe conditions from frozen condensate.

Install a fence to prevent vermin from crawling into the unit or unauthorized individuals from accessing it. Vermin and unauthorized individuals will

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Install a fence to prevent vermin from crawling into the unit or unauthorized individuals from accessing it. Vermin and unauthorized individuals will

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Select a location for installing the outdoor unit that will meet the following conditions:

• Where there is enough strength to bear the weight of the unit.

• A location that allows for optimum air flow and is easily accessible for inspection, maintenance, and service.

• Where piping between the outdoor unit and indoor unit (and branch distribution unit[s], if Multi F MAX with LGRED) is within allowable limits.

• Include space for drainage to ensure condensate flows properly out of the unit when it is in heating mode.

Avoid placing the outdoor

unit in a low-lying area where water could accumulate.

• If the outdoor unit is installed in a highly humid environment (near an ocean, lake, etc.), ensure that the site is well-ventilated and has a lot

of natural light (Example: Install on a rooftop).

Do Not’s

• Where it will be subjected to direct thermal radiation from other heat sources, or an area that would expose the outdoor unit to heat or

steam like discharge from boiler stacks, chimneys, steam relief ports, other air conditioning units, kitchen vents, plumbing vents, and other

sources of extreme temperatures.

• Where high-frequency electrical noise / electromagnetic waves will affect operation.

• Where operating sound from the unit will disturb inhabitants of surrounding buildings.

• Where the unit will be exposed to direct, strong winds.

• Where the discharge of one outdoor unit will blow into the inlet side of an adjacent unit (when installing multiple outdoor units).

Planning for Snow and Ice

To ensure the outdoor unit operates properly, certain measures are required in locations where there is a possibility of heavy snowfall or

severe windchill or cold:

1. Prepare for severe winter wind chills and heavy snowfall, even in areas of the country where these are unusual phenomena.

2. Position the outdoor unit so that its airflow fans are not buried by direct, heavy snowfall. If snow piles up and blocks the airflow, the sys-

tem will malfunction.

3. Remove any snow that has accumulated four (4) inches or more on the top of the outdoor unit.

4. In climates that will experience significant snow buildup, mount the outdoor unit on a raised, field-provided platform or stand. The raised

support platform must be high enough to allow the unit to remain above possible snow drifts, and must be higher than the maximum antici-

pated snowfall for the location.

5. Design the mounting base to prevent snow accumulation on the platform in front or back of the unit frame.

6. Provide a field fabricated snow protection hood to keep snow and ice and/or drifting snow from accumulating on the coil surfaces.

7. To prevent snow and heavy rain from entering the outdoor unit, install the condenser air inlets and outlets facing away from direct winds.

8. Consider tie-down requirements in case of high winds or where required by local codes.

PLACEMENT CONSIDERATIONS

Selecting the Best Location for the Outdoor Unit

Outdoor Unit Condensate Drain Piping

Outdoor unit requires condensate drain piping. Condensate drain pipe is constructed with materials approved by local code. See pages 20 to

22 for information in reference to outdoor unit placement.

Installation

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Rooftop Installations

If the outdoor unit is installed on a roof structure, be sure to level the unit. Ensure the roof structure and anchoring method are adequate for

the unit location. Consult local codes regarding rooftop mounting.

Ocean winds

Windbreaker

Oceanside Installation Precautions

• Install the outdoor unit on the side of the building opposite from

direct ocean winds.

• Select a location with good drainage.

• Periodically clean dust or salt particles off of the heat exchanger

with water.

Avoid installing the outdoor unit where it would be directly exposed to

ocean winds.

Additional anti-corrosion treatment will need to be applied to the outdoor

unit at oceanside locations.

If the outdoor unit must be

placed in a location where it

would be subjected to direct

ocean winds, install a concrete

windbreaker strong enough to

block any winds. Windbreaker

height and width must be more

than 150% of the outdoor unit,

and be installed at least 27-1/2

inches away from the outdoor

unit to allow for airflow.

Ocean winds will cause corrosion, particularly on the condenser and

HYDSRUDWRU¿QVZKLFKLQWXUQFRXOGFDXVHSURGXFWPDOIXQFWLRQRULQHI¿-

cient performance.

When deciding on a location to place the outdoor unit, be sure to choose an area where run-off from defrost will not accumulate and freeze on

sidewalks or driveways, which will create unsafe conditions. Properly install and insulate any drain hoses to prevent the hose from freezing, cracking,

leaking, and causing unsafe conditions from frozen condensate.

PLACEMENT CONSIDERATIONS

Planning for Snow and Ice, continued.

Tie-Downs and Lightning Protection

Tie-Downs

• The strength of the roof must be checked before installing the

outdoor units.

• If the installation site is prone to high winds or earthquakes, when

installing on the wall or roof, securely anchor the mounting base

using a field-provided tie-down configuration approved by a local

professional engineer.

• The overall tie-down configuration must be approved by a local

professional engineer. Always refer to local code when using a

wind restraint system.

Lightning Protection

• To protect the outdoor unit from lightning, it must be placed within

the specified lightning safety zone.

• Power cable and communication cable must be installed five (5)

feet away from lightning rod.

• A high-resistance ground system must be included to protect

against induced lightning or indirect strike.

Table 7: 6DIHW\=RQH6SHFL¿FDWLRQV

Building Height (feet) 66 98 148 197

3URWHFWLRQ$QJOHÜ 55 45 35 25

Ground

Safe zone

Lightning rod

Protection Angle (25˚~55˚)

1.5m

5 feet

Lightning rod

Figure 4: Lightning Protection Diagram.

If the building does not include lightning protection, the outdoor unit will be damaged from a lightning strike. Inform the customer of this possibility in

advance.

Selecting the Best Location for the Outdoor Unit

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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PLACEMENT CONSIDERATIONS

Multi F with LGRED Outdoor Unit (18,000, 24,000, 30,000 Btu/h Capacities) Service Access and Allowable Clearances

Specific clearance requirements in the diagram below are for (18,000, 24,000, 30,000 Btu/h capacities). Figure 5 shows the overall minimum

clearances that must be observed for safe operation and adequate airflow around the outdoor unit.

When placing the outdoor unit under an overhang, awning, sunroof or other “roof-like structure”, observe the clearance requirements (as

shown in Cases 1 and 2) for height in relation to the unit. To have successful service access to the outdoor unit, see Figure 5 for minimum

spacing. When installing multiple outdoor units, see Cases 4 and 5 for correct spacing requirements.

Figure 5: Multi F with LGRED 18,000, 24,000, 30,000 Btu/h Capacity Outdoor Unit Service Access and Allowable Clearances Diagram.

Unit: Inch A B C D E F G

Case 1

Standard 12 24 - 12 - - -

Minimum 410- 4 - -40

Case 2

Standard --20----

Minimum --14---40

Case 3

Standard - - 20 12 - - -

Minimum --144---

Case 4

Standard ---1224--

Minimum ---4879-

Case 5

Standard -24-12- - -

Minimum -10- 4 - - -

Table 8: Multi F with LGRED 18,000, 24,000, and 30,000 Outdoor Unit Service Access and Allowable Clearances Diagram Legend.

Do not place the unit where animals

and/or plants will be in the path of the warm

air, or where the warm air and/or noise will

disturb neighbors.

If the outdoor unit is installed between standard and minimum clearances, capacity decreases approximately 10%.

Minimum Allowable Clearance and Service Access Requirements

Proper clearance for the outdoor unit coil is critical for proper operation. When installing the outdoor unit, consider service, inlet and outlet,

and minimum allowable space requirements as illustrated in the diagrams on the following pages.

• Include enough space for airflow and for service access. If installing multiple outdoor units, avoid placing the units where the discharge

of one unit will blow into the inlet side of an adjacent unit.

• If an awning is built over the unit to prevent direct sunlight or rain exposure, make sure that the discharge air of the outdoor unit isn’t restricted.

•

No obstacles to air circulation around the unit; keep proper distances from ceilings, fences, floor, walls, etc. (Install a fence to prevent

pests from damaging the unit or unauthorized individuals from accessing it.)

1/16 inch

20 inches or less

Case 1

Case 4

Case 2 Case 3

Case 5

20 inches or less

Selecting the Best Location for the Outdoor Unit

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Minimum 12

Air inlet grille

Blown

air

Strong

wind

Strong

wind

Minimum 12

Minimum 24

Sunroof

Fence or

obstacles

Minimum 12

Air inlet grille

Blown

air

Strong

wind

Strong

wind

Minimum 20

Fence or

obstacles

Unit: Inch

Minimum 12

Ensure that the space at the back of the outdoor unit is a minimum of 12 inches, and

include a minimum of 24 inches at the right side of the unit for service.

If the outdoor unit discharge side faces a wall, include a minimum of 20 inches between

the outdoor unit and the wall. Install the outdoor unit so that the discharge port is set at a

right angle to the wind direction.

Multi F MAX with LGRED Outdoor Unit (36,000, 42,000, 48,000 Btu/h Capacity) Service Access and Allowable Clearances

When installing the outdoor unit, consider service, inlet, and outlet, and minimum allowable space requirements as illustrated in the following

diagrams.

Clearance Requirements when Different Obstacles are Present (Unit: Inch).

Selecting the Best Location for the Outdoor Unit

Minimum 12"

Minimum 40"

Obstacles above and on

the air intake side.

Maximum 20"

Minimum 12"

Minimum 12

Minimum 24

Obstacle on the suction side

only.

Obstacles on the suction side

and on both left and right sides.

Minimum 12"

Maximum 20

Minimum 12"

Minimum 40"

Minimum 24"

Obstacles above, on the air intake

side, and on both left and right sides.

Minimum 20"

Obstacle just on the air

discharge side.

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Clearance Requirements when Different Obstacles are Present, continued. (Unit: Inch)

PLACEMENT CONSIDERATIONS

Selecting the Best Location for the Outdoor Unit

Table 9: Ratio among H, A, and L.

If a stand is necessary, it must be contained (not

open frame) to prevent the discharge air from

short cycling.

 H

/+ 30 inches

1/2 H < L 40 inches

H < L 6HW6WDQGDV/+

³/´PXVWEHORZHUWKDQ³+´,IDVWDQG

is necessary, it must be contained (not

open frame) to prevent the discharge air

from short cycling.

Where there are obstacles on both suction

and discharge sides (discharge side obstacle

is higher than the outdoor unit).

Minimum 20"

Minimum 12"

Where there are obstacles above, and on both

suction and discharge sides (discharge side obstacle

is higher than the outdoor unit).

Maximum 20"

Minimum 12"

Minimum 40"

Maximum 20"

Minimum 12"

Where there are obstacles above, and on both

suction and discharge sides (discharge side obstacle

is lower than the outdoor unit).

Minimum 12"

Minimum 79"

Minimum 24"

Minimum 40"

Series installation.

Where there are obstacles on both suction

and discharge sides (discharge side obstacle

is lower than the outdoor unit).

Minimum 20"

Minimum 12"

Minimum 20

Maximum 20"

Minimum 40"

Obstacles above and on

the air discharge side.

Minimum 12"

Minimum 24"

Side-by-side series installation.

Installation

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PLACEMENT CONSIDERATIONS

Installing Outdoor Units Indoors

LG Multi F / Multi F MAX with LGRED outdoor units are engineered to be mounted outdoors and include technology designed to minimize the

negative effects of winter weather’s freezing rain, sleet, and snow. Some building projects, however, necessitate placing the HVAC outdoor

units indoors:

• Lack of ground space.

• Lack of an appropriate outdoor location that meets system design requirements.

• When mounting on the roof is not an option due to a lack of roof space.

• Roof warranty will be voided if mechanical equipment is placed on the membrane.

• On retrofit projects, a former chiller / boiler / air handler equipment room, mechanical area, or penthouse already exists.

• To curtail the potential need for redundant zone heating devices such as wall-fin radiators or duct heaters.

• In extremely cold environments where there is a significant amount of run-time at temperatures well below freezing outside the outdoor unit

ambient air temperature range published in this engineering manual.

Benefits of Installing Outdoor Units Indoors

• Shelters the outdoor unit from direct exposure to prevailing winds that decrease the heating capability of the outdoor unit.

• Protects equipment from freezing precipitation and/or potential ice build-up that could hinder unit operation.

• Maintains coil heat transfer efficiency by reducing the number of and shortening the cycle time for defrost operation.

• Easier maintenance and servicing during inclement weather.

• When mounted in a fully enclosed space, limiting the ambient air temperature will allow the Multi F / Multi F MAX with LGRED system

designer to eliminate oversizing.

• The outdoor unit to compensate for loss of capacity at low ambient temperatures.

• Will also curtail the need to provide inefficient redundant zone heating devices such as wall-fin radiators and second-stage ancillary heating

devices.

Design Considerations Include:

• Enclosure types and elements such as louvers (see next page), rain hoods, dampers and controls, heating methods and sizing of heating

devices.

• Heating strategies.

• Duct design.

• Condensate handling.

General Guidelines

• Follow ASHRAE 62.1 design guidelines.

• Depending on the project / application, a roof over the outdoor units in combination with a wind break will be all that is necessary.

• Consider the potential for snow accumulation near louvers / roof openings. Outside air intakes and discharge ducts/louvers must be engi-

neered to clear anticipated snow accumulation levels by at least one (1) foot.

• ,QVLWXDWLRQVZKHUHRSHUDWLRQLVDQWLFLSDWHGDWWHPSHUDWXUHVRI)DQGORZHUDQFLOODU\KHDWPXVWEHSURYLGHGWRKHDWWKHRXWGRRUXQLW

coils to assure continuous compressor operation and heating.

It will be necessary to use a field-fabricated air guide to prevent discharge air from short-cycling back to the coil inlet.

• Consider the direction of prevailing winds and opening placement. If possible, locate inlet openings upwind of discharge openings and other

exhaust outlets.

• When inlet and outlet openings are placed on the same wall, minimum distance between the two openings must be approximately three (3)

feet (minimum distance varies significantly with variations in outlet opening face velocity).

• If roof-mounted ventilation openings are used, strategically locate the inlet ventilation opening(s) upwind of the outlet opening(s).

• Discharge and supply ductwork must be designed to avoid weather related long periods of water entrainment and the potential for microbial

growth.

Selecting the Best Location for the Outdoor Unit

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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1. Outdoor Unit Enclosure: Manual Door Open Type.

2. /RXYHU$QJOH1R0RUH7KDQ+RUL]RQWDOO\

3. Space Between Louvers: More than 4 inches (Recommend).

4. Louver Shape: Wing or Plane Type.

Inside

Outside

Air flow passing through

the louver blade backwards

can generate noise.

side

Maximum 15°

(Recommended)

More than 4 in.

(Recommended)

Louver

• Open Rate and Inlet must be taken into consideration when design-

ing the louvered outdoor unit enclosure.

• 'RQRWXVH³6´W\SHORXYHUV

If the Louver Open Rate is Too Small

1. Noise can occur because of the increased air velocity passing

through the louver blade.

2. Noise can occur from louver blade vibrations.

3. A drop in outdoor unit fan performance (excess static pressure can

cause a drop in outdoor unit performance and heat exchanger ef-

ficiency).

4. If the louver open rate is too small or there is insufficient air flow

exchange, the air conditioner might stop operating.

Figure 6: Louver Recommendations.

Figure 7: Using “S” Type Louvers.

Provide a means to drain the condensate generated during heating mode and defrost cycle in addition to rainwater that infiltrates the inlet

louver enclosed area.

• Install a field-provided drain pan under the outdoor units and provide a path to a nearby floor drain.

• ,IWKHDPELHQWDLUWHPSHUDWXUHLVH[SHFWHGWRGURSEHORZ)LQWKHHQFORVXUHKHDWWKHERWWRPVXUIDFHRIWKHSDQGUDLQOLQHDQGIORRU

drain so that the condensate does not freeze before reaching the drain.

Louver Recommendations for Outdoor Unit Enclosure

Allow for ventilation intake and exhaust air based on maximum outdoor unit fan capacity.

• Select the size, type and orientation of architectural louvers with adequate “net free area” face velocity to ensure the total external static

pressure from the outdoor unit fan does not exceed design limitations (see specification data tables).

• No obstructions must be placed in front of the louver that could hamper the free flow (throw) of air.

• Roof top openings and / or discharge and supply louvers must be equipped with screens to prevent bird and insect infiltration.

For louver recommendations, see below and on the next page.

As always, the best solution for each project balances acceptable heating performance (considering local weather conditions), capital costs,

life cycle energy consumption, and limitations set forth by local building codes.

When deciding on a location to place the outdoor unit, be sure to choose an area where run-off from defrost will not accumulate and freeze on side-

walks or driveways which will create unsafe conditions.

CAUTION

PLACEMENT CONSIDERATIONS

Selecting the Best Location for the Outdoor Unit

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Figure 8: Open Rate by Louver Radian Formula.

Side View

ho = h * COS

Total Area (A) = H * W

Number of Open Spaces (N) = (Number of Louvers - 1)

Effective Area (Af) = ho * W * N

Louver Open Rate (n) = Af / A

Af = A * n

Effective Cross Section Area

Front View



Open Rate by Louver Radian

PLACEMENT CONSIDERATIONS

Selecting the Best Location for the Outdoor Unit

Confirming Air Flow Rate / Total Opening Rate

• Example: LMU361HHV

• Discharge Airflow Rate: 4,238 ft.

/min.

• Velocity of Outlet Air: 12.9 ft./s

• Velocity of Inlet Air: 7.7 ft./s

• Open Rate = 80% or More

• Inlet airflow should match or exceed discharge

airflow.

• Separate inlet airflow from discharge airflow to

prevent recirculation.

Open Rate = Effective Face Area (Af)

Total Face Area (A)

Figure 9: Example of Installing Outdoor Unit Indoors.

Formula

• Total Louver Dimension (Excluding Frame) (A) = 3.9 feet x 6.2 feet = 24.2 ft.

• Area Blocked by Outdoor Unit (Discharge) (B) = 3.12 feet x 4.53 feet = 14.13 ft.

• Inlet Louver Dimension (A - B) = 10.1 ft.

• Equivalent Inlet Dimension (Open Rate 80%) = 10.1 ft.

x 0.8 = 8.08 ft.

• Equivalent Inlet Air Volume = 8.08 ft.

x 7.7 ft./s x 60 sec./min. = 3,734 ft.

/min.

• Equivalent Inlet Airflow / Discharge Airflow = 3,734 ft.

/min. / 4,238 ft.

/min. = 88% (Not Allowed; Suction Airflow Must Equal /

Exceed Discharge Airflow)

55-1/8

47-1/4

74-13/16

Unit: Inch

Air Guide Duct

Louver Dimensions

Air Guide Duct on

Outdoor Unit

Dimensions

54-11/32

37-3/8

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Selecting the Best Location for the Indoor Units

Select a location for installing the indoor units that will meet the following conditions:

• Within allowable parameters for proper connection to the outdoor unit (and branch distribution unit, if a Multi F MAX with LGRED system).

• So that condensation drainage can be conveniently routed away.

• Include enough space around the indoor unit so that it is accessible for maintenance and service purposes.

• Where electrical noise / electromagnetic waves will not affect indoor unit operation. Maintain proper distances between the indoor units and

electric wires, audio and visual appliances, breaker / circuit panels, etc. If the frequency signal of the appliance is unstable, then install the

indoor unit a minimum of ten (10) feet away, and run the power and transmission cables through a conduit.

• An area that is level and with enough strength to bear the weight of the indoor unit(s).

Do Not’s

• Install in an area with obstacles to air circulation around the unit; keep proper distances from ceilings, doorways, floor, walls, etc.

• Install in an area where operation sound will disturb occupants.

• Install in an area that exposes the indoor unit(s) to heat, water, steam, oil splattering or spray.

Selecting the Best Location for the Branch Distribution (BD) Units

Branch distribution (BD) units are used only with Multi F

MAX with LGRED systems to distribute the refrigerant

from the outdoor unit up to six (6) indoor units.

Select a location indoors that will meet the following

conditions:

• Within allowable parameters for proper connection

to the Multi F MAX with LGRED outdoor unit and

indoor unit(s); refrigerant piping and wire lengths

must not exceed amounts specified by LG Elec-

tronics, U.S.A., Inc.

• Condensate drain piping is not required.

• Ensure there is enough space in the installation

area for service purposes (minimum 24 inches); install the refrigerant piping and electrical wiring system in an easily accessible location.

• Level where there is enough strength to bear the weight of the branch distribution unit.

Do Not’s

• Install the branch distribution unit in a location where it would be subjected to strong radiation heat from heat sources.

• Install in an installation environment where the branch distribution unit would be exposed to heat, water, steam, oil splattering or spray.

• Install the unit in a location where any sound it generates will disturb occupants in the surrounding rooms.

• Install in a location where there are obstacles to air circulation around the unit; keep proper distances from ceilings, doorways, floor, walls,

etc.

• Install in an area where high-frequency electrical noise / electromagnetic waves will affect operation. Maintain proper distances between the

branch distribution unit(s) and electric wires, audio and visual appliances, breaker / circuit panels, etc.

Indoor units (IDUs) must not be placed in an environment where the IDUs will be exposed to harmful volatile organic compounds (VOCs) or in

environments where there is improper air make up or supply or inadequate ventilation. If there are concerns about VOCs in the environment where

the IDUs are installed, proper air make up or supply and / or adequate ventilation must be provided. Additionally, in buildings where IDUs will be

exposed to VOCs consider a factory-applied epoxy coating to the fan coils for each IDU.

)RUGHWDLOHGSODFHPHQWFRQVLGHUDWLRQVDQGLQVWDOODWLRQUHTXLUHPHQWVIRULQGRRUXQLWVUHIHUWRLWV,QGRRU8QLW(QJLQHHULQJDQG

or Installation Manuals.

PLACEMENT CONSIDERATIONS

6HOHFWLQJWKH%HVW/RFDWLRQIRUWKH,QGRRU8QLWV

Branch Distribution Units

PCB

1-31/321-3/16

4-3/8

Service Direction

Piping to

Indoor Units

Service Direction

Figure 10: %UDQFK'LVWULEXWLRQ8QLW.H\&RPSRQHQWV

Installation

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Mininum 1-3/16

Mininum 3-15/16

Minimum 15-3/4

Branch Pipe

6-5/16

Cover Control

Main Pipe

Service Space

EEV Service

Controller Service

Inspection Opening

Minimum 12

11-23/32

9-27/32

Ø3/4

Ø3/8

Suspension Bolt Pitch

9-21/32

13-9/32

Indoor Unit

Piping Direction

Unit: Inch

Minimum 24

Bottom View

Minimum 15-3/4Mininum 15-3/4

Side View

5-29/32

2-27/32

11-13/16

2-3/8

1-3/16

1-31/32

4-3/8

A-C (and PMBD3640 D) Connections:

Liquid Pipe Ø1/4

Gas Pipe Ø3/8

PMBD3641 D Connections:

Liquid Pipe Ø1/4

Gas Pipe Ø1/2

Notes:

1. For PMBD3620 Unit, Ports A and B are Available.

2. For PMBD3630 Unit, Ports A, B, and C are Available.

3. For PMBD3640 and PMBD3641 Units, Ports A, B, C, and D are Available.

ABCD

1-1/2 1-31/32

1-23/32

1-31/32

2-7/32

PLACEMENT CONSIDERATIONS

Selecting the Best Location for the Branch Distribution Units

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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02817,1*$1&+25,1*

THE OUTDOOR UNITS

0RXQWLQJ$QFKRULQJWKH2XWGRRU8QLW*HQHUDO

Specifications

• Tightly anchor the outdoor unit with a bolt and nut to a concrete or rigid platform.

• :KHQLQVWDOOLQJRQDZDOOZLWK¿HOGVXSSOLHGEUDFNHWVURRIRUURRIWRSVHFXUHO\DQFKRUWKHPRXQWLQJ

platform with nails and / or wiring, taking into consideration the possibility of strong winds or earthquakes.

• If installing the outdoor unit on the roof, check the strength of the roof.

M10

Anchor Bolt

13/16

Unit: Inch

Figure 11: Example of Using an

Insert for a Hole in a Reinforced

Concrete Beam.

Concrete Beam

Insert

Suspension Bolt

Polyblock /

Anti-Vibration

Material

Nail Securing

Polyblock

Figure 12: Close up of Bolt Attachment.

Outdoor Unit Platform Concrete Specifications

• Concrete foundations must be made of one part cement, two parts sand, and four parts gravel.

• The surface of the foundation must be finished with mortar with rounded edges, and weatherproofed.

• See table and figures for height, width, etc., requirements.

• Include an area for drainage around the foundation to ensure condensate thoroughly drains away from

the outdoor unit.

Bolting the Outdoor Unit to the Platform Procedure

1. Ensure that the concrete platform will not degrade easily, and has enough

strength to bear the weight of the unit.

2. Include an H-beam support. Firmly attach the corners, otherwise the support

will bend.

3. Use a hexagon nut.

4. If there is a possibility of vibration from the outdoor unit transmitting to the

building, add an anti-vibration material to the platform.

5. Include enough space around the concrete foundation for condensate drain-

age.

6. Seal all wiring and piping access holes with field-supplied sealing material to

prevent animals and bugs from entering the unit.

Figure 15: Bolting the Outdoor Unit to the Platform (Piping

Location Will Differ Depending on Outdoor Unit Model).

Figure 13: LMU180HHV, LMU240HHV, and LMU300HHV Outdoor Units.

Outdoor Unit Bolt Type Concrete Height Bolt Depth

LMU180HHV,

LMU240HHV,

LMU300HHV

M10-J

Minimum Four (4)

Inches

Minimum Three (3)

Inches

LMU361HHV,

LMU421HHV,

LMU480HHV

M10-J

Minimum Eight

(8) Inches

Minimum Three (3)

Inches

Table 10: 2XWGRRU8QLW)RXQGDWLRQ6SHFL¿FDWLRQV

Minimum 4

24-13/32

Minimum 16

Unit: Inch

Figure 14: LMU361HHV, LMU421HHV, LMU480HHV Outdoor Units.

Minimum

7-7/8

15-3/4

Minimum 24-13/32

Unit: Inch

oun

Bolt

Piping Connections

Installation

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Branch Distribution Unit Orientation

Multi F MAX with LGRED branch distribution (BD) units can be installed in a multitude of options to fit

various building configurations and job or application requirements (suspended from the ceiling or mount-

ed on the wall). The installation location of the PCB within the branch distribution unit can be changed for

easier service access, depending on the branch distribution unit installation itself (see the wiring section

for information). Branch distribution units include electronic expansion valves that properly seat only if

the branch distribution unit is installed in an acceptable orientation. Installations with improper branch

distribution unit orientation risk incomplete valve seating and system performance degradation from

potential refrigerant leakage through the electronic expansion valve.

This material is for informational

or educational purposes only. It is

not intended to be a substitute for

professional advice. Consult with

your engineer or design profes-

VLRQDOVIRUVSHFL¿FDSSOLFDWLRQVWR

your system.

Figure 16: Acceptable Branch Distribution Unit Ceiling Mount Orientations.

Left Side View,

Port End Facing Left

Ceiling Mounting Options

Port End View

Right Side View,

Port End Facing Right

Ceiling Ceiling

Ceiling

Top of Unit

Refrigerant Piping End View

Ceiling

Top of Unit

Into the Ceiling

Into the Unit

Into the Ceiling

Into the Unit

Into the Ceiling

Isometric View

Ceiling Mount Installation - Hangers with

Hanging Bolt

1. Drill four (4) holes in the ceiling, following the dimensions on the previous pages.

2. Attach the factory-supplied hangers with two (2) screws each at the designated four

(4) areas on the frame of the branch distribution unit.

3. Install an anchor in the ceiling, and attach the hanging bolts to the ceiling.

4. Add nuts and washers to the hanging bolt as shown at right.

5. Hang the branch distribution unit on the hanging bolts (ceiling side up), and after

checking for level (±5 degrees), securely tighten all nuts.

BD unit

Nu t

(M10 or M8

Nut

(M10 or M8)

Flat washerFlat washer

Hanging bol tHanging bolt

(M10 or M8)

Figure 17: Branch Distribution Ceiling Mount

Installation.

If a screw has been installed on the frame of the branch distribution unit and the screw has been removed, to prevent condensation, either re-install

the screw or cover the open hole with aluminum tape.

Ceiling Mount Installation - Hangers Only

1. Attach the factory-supplied hangers with two (2) screws each at the designated four

(4) areas on the frame of the branch distribution unit.

2. Install the branch distribution unit to the ceiling using two screws on each of the

hangers as shown below. Unit must be ±5 degrees of level.

3. Cover parts of the hanger holes with polyethylene foam insulation (to prevent con-

densation).

02817,1*$1&+25,1*

THE BRANCH DISTRIBUTION UNITS

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

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MULTI

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Bottom of Unit

Wall

Bottom View, Port End Facing Up

PCB

Bott

Figure 18: Unacceptable Branch

Distribution Unit Orientation.

Wall Mounting Options

Wall

Bottom View, Port End Down

PCB

Wall

Bottom

of Unit

PCB

Wall

Bottom View, Port End Facing Right

Bottom

of Unit

Bottom of Unit

Into the

Wall

Into the Unit

Into the Wall

Bottom of Unit

Isometric View

Bottom View, Port End Facing Left

Wall

Left Side View, Port End Facing Left

Wall

Top of Unit

Right Side View, Port End Facing Right

Figure 19: Acceptable Branch Distribution Unit Wall Mount Orientations.

Wall Mount Installation - Hangers Only

1. Attach the factory-supplied hangers with two (2) screws each at the designated four (4) areas on the frame of the branch distribution

unit.

2. Install the branch distribution unit to the wall using two screws on each of the hangers. Unit must be ±5 degrees of level.

3. Cover parts of the hanger holes with polyethylene foam insulation (to prevent condensation).

02817,1*$1&+25,1*

THE BRANCH DISTRIBUTION UNITS

General Refrigerant Piping System Information

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

LG Air Conditioner Technical Solution (LATS) Software

A properly designed and installed refrigerant piping system is critical to the optimal performance of LG air-conditioning systems. To assist

engineers, LG offers, free of charge, LG Air Conditioner Technical Solution (LATS) software—a total design solution for LG air conditioning

systems.

To reduce the risk of designing an improper applied system or one that will not operate correctly, LG prefers that LATS software be used on all

projects.

Formats

LATS is available to LG customers in three user interfaces: LATS HVAC, LATS CAD2, and LATS Revit. All three LATS formats are available

through www.myLGHVAC.com, or contact an LG Sales Representative.

LATS HVAC is a Windows®-based application that aids engineers in designing LG Variable Refrigerant Flow (VRF), Multi F / Multi F MAX,

Multi F / Multi F MAX with LGRED, Single-Zone, and Energy Recovery Ventilator (ERV) systems.

*Windows

is a registered mark of Microsoft

Corporation.

LATS CAD2 combines the LG LATS program with AutoCAD® soft-

ware**. It permits engineers to layout and validate LG Multi V Vari-

able Refrigerant Flow (VRF), Multi F / Multi F MAX, Multi F / Multi

F MAX with LGRED, Single-Zone, and Energy Recovery Ventilator

(ERV) systems directly into CAD drawings.

LATS Revit integrates the LG LATS program with Revit

software**.

It permits engineers to layout and validate Multi V VRF systems

directly into Revit drawings.

**AutoCAD® and Revit® are both registered marks of Autodesk, Inc.

Features

All LG product design criteria have been loaded into the program, making LATS simple to use: double click or drag and drop the component

choices. Build systems in Tree Mode where the refrigerant system can be viewed. Switch to a Schematic diagram to see the electrical and

communications wiring.

LATS software permits the user to input region data, indoor and outdoor design temperatures, modify humidity default values, zoning, specify

type and size of outdoor units and indoor units, and input air flow and external static pressure (ESP) for ducted indoor units.

The program can also:

LG AIR CONDITIONER

TECHNICAL SOLUTION (LATS)

• Import building loads from a separate Excel file.

• Present options for outdoor unit auto selection.

• Automatically calculate component capacity based on design

conditions for the chosen region.

• Verify if the height differences between the various system

components are within system limits.

• Provide the correct size of each refrigerant piping segment and LG

Y-Branches and Headers.

• Adjust overall piping system length when elbows are added.

• Check for component piping limitations and flag if any parameters

are broken.

• Factor operation and capacity for defrost operation.

• Calculate refrigerant charge, noting any additional trim charge.

• Suggest accessories for indoor units and outdoor units.

• Run system simulation.

Features depend on which LATS program is being used, and the type of system being designed.

Figure 20: Example of LATS CAD2.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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LATS Generates a Complete Project Report

LATS software also generates a report containing project design parameters, cooling and heating design data, system component perfor-

mance, and capacity data. The report includes system combination ratio and refrigerant charge calculations; and provides detailed bill of

material, including outdoor units, indoor units, control devices, accessories, refrigerant pipe sizes segregated by building, by system, by pipe

size, and by pipe segments. LATS can generate an Excel GERP report that can imported into the LG SOPS pricing and ordering system.

Proper Design to Install Procedure

LG encourages a two report design-to-install-proce-

dure. After the design engineer determines building

/ zone loads and other details, the engineer opens

the LATS program and inputs the project’s infor-

mation. When the design is complete, the “Auto

Piping” and “System Check” functions must be used

to verify piping sizes, limitations, and if any design

errors are present. If errors are found, engineers

must adjust the design, and run Auto Piping and

System Check again. When the design passes the

checks, then the engineer prints out a project “Shop

Drawing” (LATS Tree Diagram) and provides it to the

installing contractor. The contractor must follow the

LATS Tree Diagram when building the piping system, but oftentimes the design changes on the building site:

• Architect has changed location and/or purpose of room(s).

• Outdoor unit cannot be placed where originally intended.

• Structural elements prevent routing the piping as planned.

• Air conditioning system conflicts with other building systems (plumbing, gas lines, etc.).

The contractor must mark any deviation from the design on the Shop Drawing, including as-built straight lines and elbows. This “Mark Up”

drawing must be returned to the design engineer or Rep, who must input contractor changes into the LATS file. (Copy the original LATS soft-

ware file, save and rename as a separate file, and modify all piping lengths by double-clicking on each length and editing information.) Like

the shop drawing, the Auto Piping and System Check must also be run on this new “As Built” drawing. The design engineer or Rep must then

provide the final As Built file to the contractor. The Mark Up version must be compared to the As Built version for:

• Differences in pipe diameter(s). If incorrect diameters have been installed, the piping must be changed out. If pipe diameters have changed,

check to see if Y-Branches will also need to be changed.

• Changes to outdoor unit and indoor unit capacities. Capacities changes will impact line length changes.

• Additional refrigerant charge quantity (“Trim Charge”). Trim charge will change if piping lengths and diameters change. The As Built version

must reflect installed piping lengths to ensure correct trim charge.

All documents submitted by the contractor, as well as the Shop Drawing and the As Built Drawing files must be provided for commissioning

purposes. Model and serial numbers for all system components must also be submitted. If the steps previously detailed are not followed,

and all documents are not provided to the commissioning agent, the project runs the risk of not being commissioned and voiding any limited

warranty LG offers on the equipment.

LG AIR CONDITIONER

TECHNICAL SOLUTION (LATS)

Contact your LG representative for the vest software program for your application.

Figure 21: Example of a LATS Tree Diagram.

General Refrigerant Piping System Information

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Refrigerant Safety Standards

ASHRAE Standards 15-2010 and 34-2010 address refrigerant safety and the maximum allowable concentration of refrigerant in an occupied

space. Refrigerant will dissipate into the atmosphere, but a certain volume of air is required to safely dissipate the refrigerant. For R410A

refrigerant, the maximum allowable concentration of refrigerant is 26 lbs./1,000 cubic feet (Addendum L modified the RCL to 26) of occupied

spaces. Buildings with 24-hour occupancy allow half of that concentration.

If a VRF system develops a refrigerant leak, the entire refrigerant charge of the system will dump into the area where the leak occurs. To

meet ASHRAE Standards 15 and 34, the smallest room volume on the system must be calculated and compared to the maximum allowable

concentration. If the concentration level is higher than allowed, the following are some design suggestions to eliminate the problem:

• Split dual-frame and triple-frame systems into single-frame systems that have lower refrigerant charges.

• Add transfer grilles in the ceiling or walls of the smaller rooms to increase the volume of the room.

• Remove the smallest space from the system and serve it with a smaller mini-split system.

5()5,*(5$176$)(7<67$1'$5'6

DEVICE CONNECTION LIMITATIONS

Device Connection Limitations

• The minimum number of connected and operating indoor units to Multi F / Multi F MAX with LGRED systems is two, taking into consider-

ation the minimum combination ratio.

• The maximum number of indoor units for each Multi F / Multi F MAX with LGRED heat pump system is:

LMU180HHV = 2 LMU240HHV = 3 LMU300HHV = 4 LMU361HHV = 5 LMU421HHV = 6 LMU480HHV = 8

One of the most critical elements of multi-zone systems is the refrigerant piping. See below and the following page for pipe length limits that

must be followed in the design of Multi F and Multi F MAX with LGRED refrigerant pipe systems:

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ZZZOJKYDFFRP)RUSHUIRUPDQFHGDWDVHH³0XOWL)0XOWL)0$;ZLWK/*5('3HUIRUPDQFH'DWD0DQXDO´RQZZZOJKYDFFRP

Table 11: Multi F with LGRED Outdoor Unit Refrigerant Piping System Limitations.

Outdoor Unit Model (Btu/h)

LMU180HHV /

18,000

LMU240HHV /

24,000

LMU300HHV /

30,000

Max. Total System Piping Length (ft.)

164

A+B

246.1

A+B+C

246.1

A+B+C+D

Min. Length for One Branch (ft.) 9.8 9.8 9.8

Max. Length for One Branch (ft.) 82 82 82

Max. Elevation Between Each Indoor Unit

and Outdoor Unit (h1)

49.2 49.2 49.2

Max. Elevation Between Indoor Units (h2) 24.6 24.6 24.6

Max. Combination of Indoor Units 24,000 33,000 40,000

Figure 22: Multi F Refrigerant Piping System

Limitations (LMU180HHV Example).

Multi F with LGRED Outdoor Unit Piping Length

and Elevation Limitations

Example of a Multi F with LGRED System

Example: LMU300HHV outdoor unit with four (4) indoor units

connected.

ODU: Outdoor Unit.

IDU: Indoor Unit.

A, B, C, D: Pipes from Outdoor Unit to Indoor Unit.

Max. 49.2 feet

Max. 24.6 feet

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Table 12: Multi F MAX with LGRED Outdoor Unit Refrigerant Piping System Limitations.

Component

Size (Inches)

1/4 3/8 1/2 5/8 3/4

Elbow (ft.) 0.5 0.6 0.7 0.8 1.2

Y-Branch Kit (ft., Multi F MAX with

LGRED systems only)

1.6

Branch Distribution Unit (ft., Multi F

MAX with LGRED systems only)

8.2

Using Refrigerant Components

Field-supplied elbows are allowed as long as they are designed for

use with R410A refrigerant. The designer, however, must be cau-

tious with the quantity and size of fittings used, and must account

for the additional pressure losses in equivalent pipe length calcula-

tion for each branch. The equivalent pipe length of each elbow must

be added to each pipe segment.

Example of a Multi F MAX with LGRED System with Two Branch Distribution

Units

Example: LMU421HHV outdoor unit with six (6) indoor

units and two (2) branch distribution units connected.

ODU: Outdoor Unit.

IDU: Indoor Unit.

BD: Branch Distribution Unit(s).

A: Main Pipe.

B: Branch Pipe (Branch Distribution Unit[s] to Indoor Unit[s]).

Table 13: Multi F MAX with LGRED Piping Sizes.

Table 14: Equivalent Piping Length for Elbows, Y-branches, and Branch

Distribution Units.

Multi F MAX with LGRED Outdoor Unit Piping Length and Elevation

Limitations

5()5,*(5$176$)(7<67$1'$5'6

DEVICE CONNECTION LIMITATIONS

Branch Pipe

Main Pipe

BD Unit

Figure 23: Multi F MAX Refrigerant Piping

System Limitations.

Piping Main Pipe A (inch) Branch Pipe B

Liquid Ø3/8

Depends on the size

of the indoor unit piping

Gas Ø3/4

h2 IHHW

h3 IHHW

KIHHW

h1 IHHW

BDU Y-Branch

BDU

IDU

ODU

IDU

Pipe Length

(ELF = Equivalent

Length of pipe in

Feet)

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Main pipe (Outdoor

Unit to Branch Distri-

bution Units: A)

Minimum for Each (A)

Piping Segment

16.4 feet

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Branch pipe (Branch

Distribution Units to

Indoor Units: B)

Minimum 16.4 feet

Maximum IHHW

Elevation

Differential

(All Elevation

Limitations are

Measured in

Actual Feet)

If outdoor unit is above or below indoor unit (h1) IHHW

Between the farthest two indoor units (h2) IHHW

Between branch distribution unit and farthest

connected indoor unit(s) (h3)

IHHW

Between branch distribution units (h4) IHHW

Max. Combination

of IDUs

LMU361HHV = 48,000 LMU421HHV = 56,000 LMU480HHV = 65,000

.LWFRQWDLQVWZR<EUDQFKHVRQHIRUOLTXLGDQGRQHIRUYDSRU

General Refrigerant Piping System Information

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Table 15: ACR Rated Copper Tubing Material.

Table 16: ACR Rated Piping Wall Thicknesses.

All dimensions provided are in accordance with ASTM B280 – Standard.

Design pressure = 551 psig.

The Copper Tube Handbook, 2016, Copper Development Association Inc., 260 Madison Avenue, New York, NY 10016.

Type Seamless Phosphorous Deoxidized

Class UNS C12200 DHP

Straight Lengths H58 Temper

Coils O60 Temper

Table 17: ACR Copper Tubing Dimensions and Physical Characteristics

1-3

Selecting Field-Supplied Copper Piping

OD (in) 1/4 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 1-5/8

Material Rigid or Soft ACR Rated for R410A Rigid or Soft ACR Rated for R410A

Min. Bend Radius (in) 0.563 0.9375 1.5 2.25 3.0 3.0 3.5 4.0 4.5

Min. Wall Thickness (in) 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.04 0.050

Always follow local codes when selecting and installing copper pipe and piping system components.

• Commercially available piping often contains dust and other materials. Always blow it clean with a dry nitrogen.

• Prevent dust, water or other contaminants from entering the piping during installation.

For Multi-Zone Split Systems

Use ACR copper piping rated at the system working pressure (rated for R410A refrigerant).

Approved piping for use with LG HVAC products will be marked “R410 RATED” along the length of the pipe. Piping wall thickness must meet

local code requirements and be approved for a maximum operating pressure of 551 psi. When bending piping, try to keep the number of

bends to a minimum, and use the largest radii possible to reduce the equivalent length of installed piping; also, bending radii greater than ten

(10) piping diameters can minimize pressure drop. Be sure no traps or sags are present.

Always properly support the piping as per the instructions on page 41.

SELECTING COPPER PIPING

Nominal Pipe

Outside

Diameter (in)

Actual Outside

Diameter (in)

Tempered (Hard Drawn) Annealed (Soft)

Nominal Wall

Thickness (in)

Weight (lb/ft)

Cubic ft per

Linear ft

Nominal Wall

Thickness (in)

Weight (lb/ft)

Cubic ft per

Linear ft

1/4 0.250 -- -- -- 0.030 0.081 0.00020

3/8 0.375 0.030 0.126 0.00054 0.032 0.134 0.00053

1/2 0.500 0.035 0.198 0.00101 0.032 0.182 0.00103

5/8 0.625 0.040 0.285 0.00162 0.035 0.251 0.00168

3/4 0.750 0.042 0.362 0.00242 0.042 0.362 0.00242

7/8 0.875 0.045 0.455 0.00336 0.045 0.455 0.00336

1-1/8 1.125 0.050 0.655 0.00573 0.050 0.655 0.00573

1-3/8 1.375 0.055 0.884 0.00875 0.055 0.884 0.00875

1-5/8 1.625 0.060 1.14 0.0124 0.060 1.14 0.0124

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Under normal operating conditions, the vapor pipe temperature of

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large variance in pipe temperature, the designer must consider pipe

expansion and contraction to avoid pipe and fitting fatigue failures.

Refrigerant pipe along with the insulation jacket form a cohesive

unit that expands and contracts together. During system operation,

thermal heat transfer occurs between the pipe and the surrounding

insulation.

If the pipe is mounted in free air space, no natural restriction to

movement is present if mounting clamps are properly spaced and

installed. When the refrigerant pipe is mounted underground in a

utility duct stacked among other pipes, natural restriction to linear

movement is present. In extreme cases, the restrictive force of

surface friction between insulating jackets could become so great

that natural expansion ceases and the pipe is “fixed” in place. In this

situation, opposing force caused by change in refrigerant fluid/vapor

temperature can lead to pipe/fitting stress failure.

The refrigerant pipe support system must be engineered to allow

free expansion to occur. When a segment of pipe is mounted

between two fixed points, provisions must be provided to allow pipe

expansion to naturally occur. The most common method is the

inclusion of expansion Loop or U-bends mounted in the horizontal

plane. When expansion loops are placed in a vertical riser, the loop

is to be formed in a horizontal fashion resulting in a torsional move-

ment during expansion and contraction. Each segment of pipe has

a natural fixed point where no movement occurs. This fixed point is

located at the center point of the segment assuming the entire pipe

is insulated in a similar fashion. The natural fixed point of the pipe

segment is typically where the expansion Loop or U-bend must be.

Linear pipe expansion can be calculated using the following formula:

1. From the table “Linear Thermal Expansion of Copper Tubing in

Inches,” find the row corresponding with the actual length of the

straight pipe segment.

2. Estimate the minimum and maximum temperature of the pipe.

Typical pipe temperature change ranges: High Pressure Vapor:

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)/LTXLGSLSHDPELHQW))&KRRVHWKHWZRPRVW

extreme. In the column showing the minimum pipe temperature,

look up the anticipated expansion distance. Do the same for the

maximum pipe temperature.

3. Calculate the difference in the two expansion distance values.

The result will be the anticipated change in pipe length.

General Example:

A system is installed and the design shows that there is a 100 foot

straight segment of tubing between a Y-branch and a branch distribu-

tion unit. The system operates 24 hours per day. In heating, this pipe

WUDQVSRUWVKRWJDVYDSRUWRWKHLQGRRUXQLWVDW),QFRROLQJWKH

same tube is a suction line returning refrigerant vapor to the outdoor

XQLWDW)/RRNXSWKHFRSSHUWXELQJH[SDQVLRQDWHDFKWHPSHUD-

ture and calculate the difference.

Vapor Line

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7UDQVSRUWLQJ6XFWLRQ9DSRUIWSLSHDW) LQ

Anticipated Change in Length: 1.40 in. – 0.40 in. = 1.00 in.

Liquid Line

The liquid temperature remains relatively the same temperature; only

the direction of flow will reverse. Therefore, no significant change in

length of the liquid line is anticipated.

When creating an expansion joint, the joint depth must be a

minimum of two times the joint width. Although different types of

expansion arrangements are available, the data for correctly sizing

an expansion loop is provided in the table “Coiled Expansion Loops

and Offsets (Plan View).” Use soft copper with long radius bends

on longer runs or long radius elbows for shorter pipe segments.

Using the anticipated linear expansion (LE) distance calculated, look

up the Expansion Loop or U-bend minimum design dimensions. If

other types of expansion joints are chosen, design per ASTM B-88

Standards.

LE = C x L x (T

– T

) x 12

LE = Anticipated linear tubing expansion (in.)

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L = Length of pipe (ft.)

5HIULJHUDQWSLSHWHPSHUDWXUH)

$PELHQWDLUWHPSHUDWXUH)

12 = Inches to feet conversion (12 in./ft.)

Copper Expansion and Contraction

COPPER EXPANSION AND

CONTRACTION

General Refrigerant Piping System Information

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

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MULTI

WITH

To find the anticipated expansion value:

1. From the table below, find the row corresponding with the actual feet of the straight pipe segment.

2. Estimate the minimum and maximum temperature of the pipe.

3. In the column showing the minimum pipe temperature, look up the anticipated expansion distance corresponding to the segment length.

Do the same for the maximum pipe temperature.

4. Calculate the difference in the two expansion distance values. The result will be the change in pipe length.

Pipe

Length

Fluid Temperature °F

35° 40° 45° 50° 55° 60° 65° 70° 75° 80° 85° 90° 95° 100° 105° 110° 115° 120° 125° 130°

10 0.04 0.04 0.05 0.06 0.06 0.07 0.08 0.08 0.09 0.09 0.10 0.10 0.11 0.11 0.11 0.12 0.13 0.14 0.15 0.15

20 0.08 0.08 0.10 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 0.22 0.23 0.26 0.28 0.29 0.30

30 0.12 0.12 0.15 0.18 0.20 0.21 0.23 0.24 0.26 0.27 0.29 0.30 0.32 0.33 0.32 0.35 0.39 0.42 0.44 0.45

40 0.16 0.16 0.20 0.24 0.26 0.28 0.30 0.32 0.34 0.36 0.38 0.40 0.42 0.44 0.43 0.46 0.52 0.56 0.58 0.60

50 0.20 0.20 0.25 0.30 0.33 0.35 0.38 0.40 0.43 0.45 0.48 0.50 0.53 0.55 0.54 0.58 0.65 0.70 0.73 0.75

60 0.24 0.24 0.30 0.36 0.39 0.42 0.45 0.48 0.51 0.54 0.57 0.60 0.63 0.66 0.65 0.69 0.78 0.84 0.87 0.90

70 0.28 0.28 0.35 0.42 0.46 0.49 0.53 0.56 0.60 0.63 0.67 0.70 0.74 0.77 0.76 0.81 0.91 0.98 1.02 1.05

80 0.32 0.32 0.40 0.48 0.52 0.56 0.60 0.64 0.68 0.72 0.76 0.80 0.84 0.88 0.86 0.92 1.04 1.12 1.16 1.20

90 0.36 0.36 0.45 0.54 0.59 0.63 0.68 0.72 0.77 0.81 0.86 0.90 0.95 0.99 0.97 1.04 1.17 1.26 1.31 1.35

100 0.40 0.40 0.50 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.08 1.15 1.30 1.40 1.45 1.50

120 0.48 0.48 0.60 0.72 0.78 0.84 0.90 0.96 1.02 1.08 1.14 1.20 1.26 1.32 1.30 1.38 1.56 1.68 1.74 1.80

140 0.56 0.56 0.70 0.84 0.91 0.98 1.05 1.12 1.19 1.26 1.33 1.40 1.47 1.54 1.51 1.61 1.82 1.96 2.03 2.10

160 0.64 0.64 0.80 0.96 1.04 1.12 1.20 1.28 1.36 1.44 1.52 1.60 1.68 1.76 1.73 1.84 2.08 2.24 2.32 2.40

180 0.72 0.72 0.90 1.08 1.17 1.26 1.35 1.44 1.53 1.62 1.71 1.80 1.89 1.98 1.94 2.07 2.34 2.52 2.61 2.70

200 0.80 0.80 1.00 1.20 1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00 2.10 2.20 2.16 2.30 2.60 2.80 2.90 3.00

220 0.88 0.88 1.10 1.32 1.43 1.54 1.65 1.76 1.87 1.98 2.09 2.20 2.31 2.42 2.38 2.53 2.86 3.08 3.19 3.30

240 0.96 0.96 1.20 1.44 1.56 1.68 1.80 1.92 2.04 2.16 2.28 2.40 2.52 2.64 2.59 2.76 3.12 3.36 3.48 3.60

260 1.04 1.04 1.30 1.56 1.69 1.82 1.95 2.08 2.21 2.34 2.47 2.60 2.73 2.86 2.81 2.99 3.38 3.64

3.77 3.90

280 1.12 1.12 1.40 1.68 1.82 1.96 2.10 2.24 2.38 2.52 2.66 2.80 2.94 3.08 3.02 3.22 3.64 3.92 4.06 4.20

300 1.20 1.20 1.50 1.80 1.95 2.10 2.25 2.40 2.55 2.70 2.85 3.00 3.15 3.30 3.24 3.45 3.90 4.20 4.35 4.50

320 1.28 1.28 1.60 1.92 2.08 2.24 2.40 2.56 2.72 2.88 3.04 3.20 3.36 3.52 3.46 3.68 4.16 4.48 4.64 4.80

340 1.36 1.36 1.70 2.04 2.21 2.38 2.55 2.72 2.89 3.06 3.23 3.40 3.57 3.74 3.67 3.91 4.42 4.76 4.93 5.10

360 1.44 1.44 1.80 2.16 2.34 2.52 2.70 2.88 3.06 3.24 3.42 3.60 3.78 3.96 3.89 4.14 4.68 5.04 5.22 5.40

380 1.52 1.52 1.90 2.28 2.47 2.66 2.85 3.04 3.23 3.42 3.61 3.80 3.99 4.18 4.10 4.37 4.94 5.32 5.51 5.70

400 1.60 1.60 2.00 2.40 2.60 2.80 3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.32 4.60 5.20 5.60 5.80 6.00

420 1.68 1.68 2.10 2.52 2.73 2.94 3.15 3.36 3.57 3.78 3.99 4.20 4.41 4.62 4.54 4.83 5.46 5.88 6.09 6.30

440 1.76 1.76 2.20 2.64 2.86 3.08 3.30 3.52 3.74 3.96 4.18 4.40 4.62 4.84 4.75 5.06 5.72 6.16 6.38 6.60

460 1.84 1.84 2.30 2.76 2.99 3.22 3.45 3.68 3.91 4.14 4.37 4.60 4.83 5.06 4.97 5.29 5.98 6.44 6.67 6.90

480 1.92 1.92 2.40 2.88 3.12 3.36 3.60 3.84 4.08 4.32 4.56 4.80 5.04 5.28 5.18 5.52 6.24 6.72 6.96 7.20

500 2.00 2.00 2.50 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.40 5.75 6.50 7.00 7.25 7.50

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www.engineeringtoolbox.com.

Table 18: Linear Thermal Expansion of Copper Tubing in Inches.

COPPER EXPANSION AND

CONTRACTION

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Figure 24: Coiled Expansion Loops and Offsets (Plan View).

Anticipated Linear

Expansion (LE) (in.)

Nominal Tube Size (OD) inches

1/4 3/8 1/2 3/4 1 1-1/4 1-1/2

1/2

6789111213

38 44 50 59 67 74 80

9 101113151718

54 63 70 83 94 104 113

1-1/2

11 12 14 16 18 20 22

66 77 86 101 115 127 138

12 14 16 19 21 23 25

77 89 99 117 133 147 160

2-1/2

14 16 18 21 24 26 29

86 99 111 131 149 165 179

15 17 19 23 26 29 31

94 109 122 143 163 180 196

3-1/2

16 19 21 25 28 31 34

102 117 131 155 176 195 212

17 20 22 26 30 33 36

109 126 140 166 188 208 226

R = Centerline Length of Pipe.

L = Centerline Minimum Radius (inches).

Table 19: Radii of Coiled Expansion Loops and Developed Lengths of Expansion Offsets.

Large Tubing U-bend (>3/4 in.) Loop

Small Tubing U-bend (<3/4 in.)

All expansion loops and offsets must be installed in the horizontal plane to prevent the possibility of trapping oil. Loops and offsets in vertical risers

must also be installed in a horizontal plane.

COPPER EXPANSION AND

CONTRACTION

General Refrigerant Piping System Information

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Piping Handling

Pipes used for the refrigerant piping system must include the specified thickness, and the

interior must be clean.

While handling and storing, do not bend or damage the pipes, and take care not to

contaminate the interior with dust, moisture, etc.

Clean Airtight

No moisture should be inside the piping. No dust should be inside the piping. No leaks should occur.

Possible

Problems

- Significant hydrolysis of refrigerant oil.

- Refrigerant oil degradation.

- Poor insulation of the compressor.

- System does not operate properly.

- EEVs, capillary tubes are clogged.

- Refrigerant oil degradation.

- Poor insulation of the compressor.

- System does not operate properly.

- EEVs and capillary tubes become

clogged.

- Refrigerant gas leaks / shortages.

- Refrigerant oil degradation.

- Poor insulation of the compressor.

- System does not operate properly.

Solutions

- Remove moisture from the piping.

- Piping ends should remain capped until

connections are complete.

- Do not install piping on a rainy day.

- Connect piping properly at the unit’s side.

- Remove caps only after the piping is

cut, the burrs are removed, and after

passing the piping through the walls.

- Evacuate system to a maximum of 500

microns and insure the vacuum holds at

that level for 1 hour.

- Remove dust from the piping.

- Piping ends should remain capped until

connections are complete.

- Connect piping properly at the side of

the unit.

- Remove caps only after the piping is cut

and burrs are removed.

- Retain the cap on the piping when

passing it through walls, etc.

- Test system for air tightness.

- Perform brazing procedures that comply

with all applicable standards.

- Perform flaring procedures that comply

with all applicable standards.

- Perform flanging procedures that

comply with all applicable standards.

- Ensure that refrigerant lines are pressure

tested to 550 psig and hold for 24 hours.

Moisture

Dust

Leaks

Keep Pipes Capped While Storing.

Keep refrigerant pipe dry, clean, and airtight.

PIPING HANDLING

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REFRIGERANT SYSTEM ENGINEERING

Proper system operation depends on the installer using utmost care while assembling the piping system. The following pages are an over-

view of best practices when installing the refrigerant piping system.

LG Electronics U.S.A.,Inc., is not responsible for any piping calculations, refrigerant leaks, degradation of performance, any other potential problems

or damages caused by the interconnecting piping, their joint connections, isolation valves, or introduced debris inside the piping system.

No Pipe Size Substitutions

Use only the pipe size selected by the LATS HVAC pipe system design software. Using a different size is prohibited and will result in a

system malfunction or failure to work at all.

No In-line Refrigeration Components

Components such as oil traps, solenoid valves, filter-driers, sight glasses, tee fittings, and other after-market accessories are not

permitted on the refrigerant piping system between the outdoor units and the indoor / heat recovery units. LG HVAC systems are provided

with redundant systems that make sure oil is properly returned to the compressor. Sight-glasses and solenoid valves will cause vapor to form

in the liquid stream. Over time, driers will deteriorate and introduce debris into the system. The designer and installer must verify the refriger-

ant piping system is free of traps, sagging pipes, sight glasses, filter driers, etc.

Field-Provided Isolation Ball Valves

LG maintains a neutral position on using isolation valves in LG HVAC refrigerant piping systems. LG does not endorse any manufacturer of

isolation valves. It is recognized that installing isolation valves will simplify future maintenance requirements, and, if used, considerations

must be taken including, but not limited to, the following:

• Pressure drops for any component used, including isolation valves, must be known in equivalent pipe length and calculated into the total

and segment equivalent piping lengths and compared to product design limitations.

• In all cases, materials must be suitable for the application and any applicable codes, including, but not limited to, diameter and wall thick-

ness continuity per ACR standards.

Failure to do so will cause significant performance degradation. Proper leak checks must be performed. Using isolation valves does not

automatically void any LG product warranty, however, a limited warranty will be voided in whole or part must any field supplied accessory fail

in any way that causes product failure.

Using Elbows

Field-supplied elbows are allowed if they are long radius and designed for use with R410A refrigerant. The designer and installer, however,

must be cautious with the quantity and size of fittings used, and must account for the additional pressure losses in equivalent pipe length

calculation for each branch. The equivalent pipe length of each elbow must be added to each pipe segment in the LATS program.

Pipe Bends

When bending soft copper, use long radius bends. Refer to the “Radii of Coiled Expansion Loops and Developed Lengths of Expansion

Offsets” table for minimum radius specifications.

General Refrigerant Piping System Information

Due to our policy of continuous product innovation, some specifications may change without notification.

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Obstacles

When an obstacle, such as an I-beam or concrete T, is in the path of

the planned refrigerant pipe run, it is best practice to route the pipe

over the obstacle. If adequate space is not available to route the

insulated pipe over the obstacle, then route the pipe under the obsta-

cle. In either case, it is imperative the length of the horizontal section

of pipe above or below the obstacle be a minimum of three (3) times

the longest vertical rise (or fall) at either end of the segment.

Figure 25: Installing Piping Above and Below an Obstacle.

MINIMUM

Above an obstacle

MINIMUM

Below an obstacle

Pipe Supports

A properly installed pipe system must be adequately supported to avoid pipe sagging. Sag-

ging pipes become oil traps that lead to equipment malfunction.

Pipe supports must

never touch the pipe wall; supports must be installed outside

(around) the primary pipe insulation jacket. Insulate the pipe first because pipe supports

must be installed outside (around) the primary pipe insulation jacket. Clevis hangers must be

used with shields between the hangers and insulation. Field provided pipe supports must be

designed to meet local codes. If allowed by code, use fiber straps or split-ring hangers

suspended from the ceiling on all-thread rods (fiber straps or split ring hangers can be used

as long as they do not compress the pipe insulation). Place a second layer of insulation over

the pipe insulation jacket to prevent chafing and compression of the primary insulation in the

confines of the support clamp.

A properly installed pipe system will have sufficient supports to avoid pipes from sagging

during the life of the system. As necessary, place supports closer for segments where

potential sagging could occur. Maximum spacing of pipe supports must meet local codes.

If local codes do not specify pipe support spacing, pipe must be supported:

• Maximum of five (5) feet on center for straight segments of pipe up to 3/4 inches outside

diameter size.

• Maximum of six (6) feet on center for pipe up to one (1) inch outside diameter size.

• Maximum of eight (8) feet on center for pipe up to two (2) inches outside diameter size.

Wherever the pipe changes direction, place a hanger within twelve (12) inches on one side

and within twelve (12) to nineteen (19) inches of the bend on the other side. Support piping

at indoor units, Y-branch, and Header fittings as shown.

Figure 26: Pipe Hanger Details.

Figure 27: Typical Pipe Support Location—

Change in Pipe Direction.

Figure 28: Pipe Support at Indoor Unit. Figure 29: Pipe Support at Y-branch Fitting.

Figure 30: Pipe Support at Header Fitting.

Max. 12"

~ 12" – 19"

Max. 12" Max. 12"

Max. 12"

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saddles between hanger bracket and insula-

tion to promote linear expansion/contraction.

REFRIGERANT SYSTEM ENGINEERING

~ 12" – 19"

Maximum 12"

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Examples of Supports

Bolt

1.5t

Plate

Insulation

Bolt

PVC

Figure 31: U-Bolt Support with Insulation. Figure 32: O-Ring Support with Insulation.

To prevent

insulation from

pressing and

lagging, use a cover.

Sheathing

O-Ring

Band

Lags

Do not compress the insulation with the saddle-type support. If the insulation is compressed, it will tear open and allow condensation to

generate during product operation.

Welding

Refrigerant Pipe

Insulated

Support Band

Insulated

Support Band

Down

Stop

Welding

Plate Nut

Hexagonal Nut

O-ring Band

Support at Intervals Between 5 and 6-3/4 Feet

Figure 33: Saddle-Type Support.

Figure 34: U-Bolt Support with an Insulated Pipe. Figure 35: O-Ring Band Support with an Insulated Pipe.

Figure 36: One-Point Down-Stop Support (>441 lbs.).

Figure 37: Two-Point Down-Stop Support.

REFRIGERANT SYSTEM ENGINEERING

General Refrigerant Piping System Information

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Pipe Sleeves at Penetrations

LG recommends that all pipe penetrations through walls, floors, and pipes buried underground be properly insulated and routed through an

appropriate wall sleeve of sufficient size to prevent compression of refrigerant pipe insulation and promote free movement of the pipe within

the sleeve. Use 4"+ curved sheet metal saddles between the bottom surface of the pipe and the bottom surface of the penetration.

Figure 38: Pipe Sleeve Options.

Diameter of penetrations must be determined by pipe diameter plus the thickness of the insulation.

Underground Refrigerant Piping

Refrigerant pipe installed underground must be routed inside a vapor tight

protective sleeve to prevent insulation deterioration and water infiltration. Re-

frigerant pipe installed inside underground casing must be continuous without

any joints. Underground refrigerant pipe must be located at a level below the

frost line.

Figure 39: Typical Arrangement of Refrigerant Pipe

and Cable(s) in a Utility Conduit.

Table 20: Utility Conduit Sizes.

OD pipe diameter in inches; Values in parenthesis () indicate OD of pipe with insulation

jacket.

Diameter of pipe with insulation. Thickness of pipe insulation is typical. Actual required

thickness will vary based on surrounding ambient conditions and must be calculated and

VSHFL¿HGE\WKHGHVLJQHQJLQHHU

Insulation thickness (value in parenthesis) = 3/8 inch.

Insulation thickness (value in parenthesis) = 1 inch.

Insulation thickness (value in parenthesis) = 3/4 inch.

Liquid Pipe

Vapor Pipe

3/8 (2.0

2,5

) 1/2 (2.0

2,5

) 5/8 (2-1/8

2,5

) 3/4 (2-1/4

2,5

)

1/4 (1.0)

44 4 4

3/8 (1-1/8)

44 4 5

1/2 (1-1/2)

55 5 5

5/8 (1-5/8)

55 5 5

3/4 (1-3/4)

55 5 5

Vapor Line

Liquid Line

Cable

Power/Communication

e Sleeve

Insulation Material

Insulation

Material

Provide expansion joints in long pipe segments and place in an accessi-

ble conduit box for inspection. Use galvanized curved sheet metal sad-

dles at all mounting points. Pipe must be allowed to move freely linearly.

REFRIGERANT SYSTEM ENGINEERING

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3. Flaring the pipe end.

• Use the proper size flaring tool to finish flared connections as

shown.

• ALWAYS create a 45° flare when working with R410A.

1. Cut the pipe to length.

• Measure the distance between the indoor unit and the outdoor unit.

• Cut the pipes a little longer than measured distance.

2A. Remove the burrs.

• Completely remove all burrs from pipe ends.

• When removing burrs, point the end of the copper pipe down to

avoid introducing foreign materials in the pipe.

2B. Slide the flare nut onto the copper tube.

90°

Slanted Uneven Rough

Pipe

Reamer

Point

down

Flare nut

Copper

tube

Bar

Copper pipe

Clamp handle

Red arrow

Cone

Bar

Slanted

Smooth

Uneven

Thickness

2A. 2B.

4. Carefully inspect the flared pipe end.

• Compare the geometry with the figure to the right

• If the flare is defective, cut it off and re-do procedure.

• If flare looks good, blow the pipe clean with dry nitrogen.

90°

45°

“A”

R=0.4 – 0.8

Dimensions of the Flare.

Pipe Size (in. O.D.) “A” Dimension (mm [in.])

1/2

1/4

5/8

3/8

3/4

Flared Connection Dimensions / Tightening Torque.

Handle

Incorrect Flare

Even Length

Cracked

Yoke

Inside is shiny with no scratches

Surface

Damaged

Copper

tube

Outside Diameter (mm)

6.35

9.52

12.7

15.88

19.05

~ 9.1 (11/32 - 23/64)

~ 13.2 (1/2 - 33/64)

~ 16.6 (41/64 - 21/32)

~ 19.7 (49/64 - 25/32)

Flaring Procedure

Flaring and Brazing Procedures

One of the main causes of refrigerant leaks is a defective connection. For LG HVAC systems, the installer needs to know how perform both

flared and brazed connections successfully.

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state, or federal standards.

• During installation, it is imperative to keep the piping system free of contaminants and debris such as copper burrs, slag, or carbon dust.

•

Do not use kinked pipe caused by excessive bending in one specific area on its length.

FLARING AND BRAZING PROCEDURES

General Refrigerant Piping System Information

Due to our policy of continuous product innovation, some specifications may change without notification.

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13.0 - 18.0

24.6 - 30.4

39.8 - 47.7

Tightening Torque for Flare Nuts.

Tightening the Flare Nuts

1. When connecting the flare nuts, coat the flare (outside only) with polyvinyl ether (PVE) refrigeration oil only.

2. Initially hand tighten the flare nuts using three (3) or four (4) turns.

3. To finish tightening the flare nuts, use both a torque wrench and a backup wrench.

4. After all the piping has been connected and the caps have been tightened, check for refrigerant gas leaks.

Loosening the Flare Nuts

Always use two (2) wrenches to loosen the flare nuts.

Do not use polyolyester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with the PVE oil

used in this system and create oil sludge leading to equipment damage and system malfunction.

Pipe Size (in. O.D.) Tightening Torque (ft-lbs.)

1/2

1/4

5/8

3/8

3/4

Outside Diameter (mm)

6.35

9.52

12.7

15.88

19.05

45.4 - 59.3

71.5 - 87.5

Do not add any contaminants inside the refrigerant piping.

Figure 40: Refrigerant Pipe Brazing.

Pressure-reducing

Valve

Taping

Nitrogen

Pipe to

be brazed

Refrigerant

Piping

Brazing Procedure

Do not braze in an enclosed location. Do not allow the refrigerant to leak during brazing. Always test for gas leaks before and after brazing.

If the refrigerant combusts, it generates a toxic gas the will cause physical injury or death.

Braze the pipes to the service valve pipe stub of the outdoor unit.

1. All joints are brazed in the field. LG HVAC refrigeration system components contain

very small capillary tubes, small orifices, electronic expansion valves, oil separators,

and heat exchangers that can easily become blocked. Proper system operation de-

pends on the installer using best practices and utmost care while assembling the piping

system.

2. Store pipe stock in a dry place; keep stored pipe capped and clean.

3. Blow clean all pipe sections with dry nitrogen prior to assembly.

4. Use adapters to assemble different sizes of pipe.

5. Always use a non-oxidizing material for brazing.

Do not use flux, soft solder, or anti-oxidant agents. If the proper material is not used,

oxidized film will accumulate and clog or damage the compressors. Flux can harm the copper piping or refrigerant oil.

6. Use a tubing cutter,

do not use a saw to cut pipe. De-bur and clean all cuts before assembly.

7. Brazing joints:

• Use a dry nitrogen purge operating at a minimum pressure of three (3) psig and maintain a steady flow.

• Use a 15% silver phosphorous copper brazing alloy to avoid overheating and produce good flow.

• Protect isolation valves, electronic expansion valves, and other heat-sensitive control components from excessive heat with a wet rag or

heat barrier spray.

WARNING

FLARING AND BRAZING PROCEDURES

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INSTALLING MULTI F WITH

LGRED SYSTEMS

Multi F with LGRED Outdoor Unit to Indoor Unit Piping Connections

Figure 41: Multi F with LGRED Outdoor Unit

Refrigerant Pipe Connections (LMU240HHV

shown as example).

Multi F with LGRED Outdoor Unit

(18, 24, 30kBtu/h)

Liquid

Piping

Liquid Piping

Service

Port

Vapor Piping

Service Port

ROOM A

ROOM B

ROOM C

Vapor Piping

Avoid Pipe Damage

• When routing field-provided piping, avoid damaging the outdoor unit from exces-

sive vibration.

• Properly insulate the liquid and gas lines separately up to the point of connection at

the unit frame.

• See table below for Multi F with LGRED outdoor unit connection types.

Correctly route the piping so it does not make contact with mounting bolts. Allow room

IRU¿HOGLQVWDOODWLRQ

Table 21: Multi F with LGRED Outdoor Unit Piping Connections.

Outdoor Unit Piping Connections LMU180HHV LMU240HHV LMU300HHV

Liquid Line Connection (in., OD) x Qty. Ø1/4 x 2 Ø1/4 x 3 Ø1/4 x 4

Vapor Line Connection (in., OD) x Qty. Ø3/8 x 2 Ø3/8 x 3 Ø3/8 x 4

Connection sockets (included as a factory-supplied accessory with the indoor units) will need to be used when piping the indoor units to the outdoor

unit. See tables above and below for indoor unit piping connection and connection socket dimensions. See the following page for the connection

socket installation procedure.

Table 22: Indoor Unit Pipe Sizes.

Table 23: Connection Socket Dimensions.

Indoor Unit Capacity

Vapor Line

Piping Size (in., OD)

Liquid Line

Piping Size (in., OD)

7,000 Btu/h

Ø3/8

Ø1/4

9,000 Btu/h

12,000 Btu/h

15,000 Btu/h

15,000 Btu/h:

Console;

18,000 Btu/h

Ø1/2

24,000 Btu/h

Table 24: Indoor Unit Piping Connections.

Indoor Unit Capacity

Vapor Line

Conn. (in., OD)

Liquid Line

Conn. (in., OD)

7,000 Btu/h

Ø3/8 Ø1/4

9,000 Btu/h

12,000 Btu/h

15,000 Btu/h

18,000 Btu/h: Wall-Mounted Ø5/8 Ø3/8

15,000 Btu/h: Console;

18,000 Btu/h: Low Static Duct,

Four-Way Cassette, VAHU

Ø1/2 Ø1/4

24,000 Btu/h Ø1/2 Ø1/4

Indoor Unit Capacity

Vapor (in., OD) Liquid (in., OD)

A B A B

18,000 Btu/h Wall-Mounted and Vertical Air Handling Units ĺĺ ĺ

15,000 Btu/h: Console; 18,000 Btu/h: Low Static

Duct, Four-Way Cassette, VAHU

ĺ N/A

24,000 Btu/h ĺ N/A

Refrigerant Piping System Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Connection Socket

Figure 43: Connection Socket Installation.

Installing Field Piping to the Outdoor Unit Piping Connections

1. Verify the outdoor unit service ports are closed.

2. Remove the caps on the outdoor unit piping connections.

3. Connect the gas piping first to ROOM A, then to ROOM B, then to ROOM C, in that

order. Number of connections will differ depending on outdoor unit.

4. Tighten each gas piping connection individually following the “Tightening the Flare Nuts”

procedure below.

5. Connect the liquid piping first to ROOM A, then to ROOM B, then to ROOM C, in that

order. Number of connections will differ depending on outdoor unit.

6. Tighten each liquid piping connection individually following the “Tightening the Flare

Nuts” procedure below.

Using the Connection Socket

Some indoor units require the use of a connection socket when piping the indoor units

to the outdoor unit. (See previous page for information.) The connection sockets are

included as a factory-supplied accessory with the indoor units. To install:

1. Align the center of the piping sections as seen in the diagrams at right and below.

2. Follow the “Tightening the Flare Nuts” procedure above.

Connection Socket Necessary

Only for 18, 24 kBtu/h Indoor

Units

Flare

Indoor

Unit

Flare

Outdoor

Unit

Figure 42: Close Up of the Field Piping to the

Outdoor Unit Piping Connection.

Figure 44: Connection Socket Diagram, External View.

Figure 45: Connection Socket Diagram, Internal View.

13.0 - 18.0

24.6 - 30.4

39.8 - 47.7

Tightening Torque for Flare Nuts.

Tightening the Flare Nuts

1. When connecting the flare nuts, coat the flare (outside only) with polyvinyl ether (PVE) refrigeration oil only.

2. Initially hand tighten the flare nuts using three (3) or four (4) turns.

3. To finish tightening the flare nuts, use both a torque wrench and a backup wrench.

4. After all the piping has been connected and the caps have been tightened, check for refrigerant gas leaks.

Do not use polyolyester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with the PVE oil

used in this system and create oil sludge leading to equipment damage and system malfunction.

Pipe Size (in. O.D.) Tightening Torque (ft-lbs.)

1/2

1/4

5/8

3/8

3/4

Outside Diameter (mm)

6.35

9.52

12.7

15.88

19.05

45.4 - 59.3

71.5 - 87.5

Do not add any contaminants inside the refrigerant piping.

INSTALLING MULTI F WITH

LGRED SYSTEMS

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

INSTALLING MULTI F MAX WITH

LGRED SYSTEMS

0XOWL)0$;ZLWK/*5('5HIULJHUDQW3LSLQJ&RQQHFWLRQV3LSLQJ5RXWHV

For Multi F MAX with LGRED

outdoor units, piping can be in-

stalled in one of four directions:

front, rear, right, and bottom.

Whatever direction is chosen,

plug the access holes with

field-provided putty or insulation

to fill all gaps.

If the piping is installed from the

bottom, the access hole of the

base pan must be knocked out

before piping work begins.

Figure 46: Multi F MAX with LGRED Outdoor Unit

Refrigerant Piping Connection Options.

Insects or small animals entering the outdoor unit will cause a short circuit in the electrical

ER[ZKLFKZLOOOHDGWR¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK

Insects or small animals entering the outdoor unit will cause a short circuit in the electrical

box, which will lead to unit failure.

Access Hole Knock Out

for Liquid / Gas Piping

Base Pan

Front

Right

Rear

Bottom

Gas Piping

Service Port

(Larger Dia.)

Liquid Piping

Service Port

(Smaller Dia.)

Putty or Insulation (Field Supplied)

Drain Hose

Communication /

Connection

(Power) Cable

Piping to the

Branch

Distribution Units

Figure 47: 5HPRYLQJWKH%DVH3DQ.QRFN2XW+ROH

Figure 48: Filling Access Holes in the Outdoor Units.

Multi F MAX with LGRED Outdoor Unit System Piping Connections

Outdoor Unit Piping Connections LMU361HHV, LMU421HHV, LMU480HHV

Liquid Line Connection (in., OD) x Qty. Ø3/8 x 1

Vapor Line Connection (in., OD) x Qty. Ø3/4 x 1

Avoid Pipe Damage

• When routing field-provided piping, avoid damaging the outdoor unit from exces-

sive vibration.

• Properly insulate the liquid and gas lines separately up to the point of connection at

the unit frame.

• See table below for Multi F MAX outdoor unit connection types.

Table 25: Multi F MAX with LGRED Outdoor Unit Piping Connections.

Torque

Wrench

Figure 49: Multi F MAX with LGRED Outdoor Unit

Refrigerant Pipe Connections.

Correctly route the piping so it does not make contact with mounting bolts. Allow room

IRU¿HOGLQVWDOODWLRQ

Refrigerant Piping System Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Multi F MAX with LGRED Outdoor Units

(36, 42, 48 kBtu/h)

(For 7~24 kBtu/h Indoor Units)

(Branch Distribution Unit: PMBD3640)

A ROOM

B ROOM

C ROOM

D R

OOM

A ROOM

B ROOM

C ROOM

D ROOM

(Branch Distribution Unit: PMBD3641)

(Ports A~C only for 7~24 kBtu/h

Indoor Units;

Port D only for 24 or 36 kBtu/h

Indoor Units)

Branch Distribution to Indoor Unit Piping Connections

• Install indoor unit liquid and vapor refrigerant pipes (and connection wiring) to the appropri-

ate branch distribution ports.

• Clearly note on the indoor unit’s refrigerant piping (liquid, vapor) which branch distribution

port it is connected to (A, B, C, D).

Table 26: Branch Distribution Unit Piping Connections.

Branch

Distribution

Unit

Refrigerant Connections

Pipe Size (in.)

Connectible Indoor Unit Capacity

(Btu/h)

Liquid Vapor

PMBD3620 Ø1/4 x 2 Ø3/8 x 2 7,000, 9,000, 12,000, 15,000, 18,000, 24,000

PMBD3630 Ø1/4 x 3 Ø3/8 x 3 7,000, 9,000, 12,000, 15,000, 18,000, 24,000

PMBD3640 Ø1/4 x 4 Ø3/8 x 4 7,000, 9,000, 12,000, 15,000, 18,000, 24,000

PMBD3641 Ø1/4 x 4

Ø3/8 x 3 7,000, 9,000, 12,000, 15,000, 18,000, 24,000 (A, B, C)

Ø1/2 x 1 24,000, 36,000 (D)

Figure 51: Branch Distribution Ports to Indoor

Units -- Side View.

Connection sockets (included as

a factory-supplied accessory with

the indoor units) will need to be

used when piping the indoor units

to the branch distribution unit.

The connection sockets for 36k

indoor units are factory supplied

with the branch distribution units.

See tables above and below for

indoor unit piping connection and

connection socket dimensions.

See the following page for the

connection socket installation

procedure.

Indoor Unit Capacity

Vapor Line

Piping Size (in., OD)

Liquid Line

Piping Size (in., OD)

7,000 Btu/h

Ø3/8

Ø1/4

9,000 Btu/h

12,000 Btu/h

15,000 Btu/h

15,000 Btu/h: Console;

18,000 Btu/h

Ø1/2

24,000 Btu/h

36,000 Btu/h Ø5/8 Ø3/8

Indoor Unit Capacity

Vapor Line

Conn. (in., OD)

Liquid Line

Conn. (in., OD)

7,000 Btu/h

Ø3/8 Ø1/4

9,000 Btu/h

12,000 Btu/h

15,000 Btu/h

18,000 Btu/h: Wall-Mounted Ø5/8 Ø3/8

15,000 Btu/h: Console;

18,000 Btu/h: Low Static Duct,

Four-Way Cassette, VAHU

Ø1/2 Ø1/4

24,000 Btu/h Ø1/2 Ø1/4

36,000 Btu/h Ø5/8 Ø3/8

Table 27: Indoor Unit Pipe Sizes.

Table 28: Indoor Unit Piping Connections.

Indoor Unit Capacity

Vapor (in., OD) Liquid (in., OD)

A B A B

18,000 Btu/h: Wall-Mounted ĺĺ ĺ

15,000 Btu/h: Console;

18,000 Btu/h: Low Static Duct, Four-Way Cassette,

VAHU

ĺ N/A

24,000 Btu/h* ĺ N/A

36,000 Btu/h ĺ ĺ

Table 29: Connection Socket Dimensions.

INSTALLING MULTI F MAX WITH

LGRED SYSTEMS

Figure 50: Branch Distribution Piping

Connections.

ABC D

*No socket adapter is required if connected to Port D on the PMBD3641.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Installing Field Piping to the Branch Distribution Unit Piping Connections

1. Remove any caps, etc., that could be on the branch distribution unit.

2. Tighten each piping connection individually following the “Tightening the Flare Nuts” procedure below.

3. When all piping installation has been completed, perform the triple leak / pressure and evacuation tests (see the Final Installation Proce-

dures Section), verify that the system does not have any leaks, and then fully insulate all joints / connections.

Figure 52: Close Up of Branch Distribution to Indoor Unit Piping Connections.

13.0 - 18.0

24.6 - 30.4

39.8 - 47.7

Tightening Torque for Flare Nuts.

Tightening the Flare Nuts

1. When connecting the flare nuts, coat the flare (outside only) with polyvinyl ether (PVE) refrigeration oil only.

2. Initially hand tighten the flare nuts using three (3) or four (4) turns.

3. To finish tightening the flare nuts, use both a torque wrench and a backup wrench.

4. After all the piping has been connected and the caps have been tightened, check for refrigerant gas leaks.

Do not use polyolyester (POE) or any other type of mineral oil as a thread lubricant. These lubricants are not compatible with the PVE oil

used in this system and create oil sludge leading to equipment damage and system malfunction.

Pipe Size (in. O.D.) Tightening Torque (ft-lbs.)

1/2

1/4

5/8

3/8

3/4

Outside Diameter (mm)

6.35

9.52

12.7

15.88

19.05

45.4 - 59.3

71.5 - 87.5

Do not add any contaminants inside the refrigerant piping.

A ROOM

B ROOM

C ROOM

D ROOM

(Branch Distribution Unit: PMBD3641)

(Ports A~C only for 7~24 kBtu/h

Indoor Units;

Port D only for 24 or 36 kBtu/h

Indoor Units)

(For 7~24 kBtu/h Indoor Units)

(Branch Distribution Unit: PMBD3640)

A ROOM

B ROOM

C R

OOM

D ROOM

Using the Connection Socket

Some indoor units require the use of a connection socket when piping the indoor units to the branch distribution unit. (See previous page and

below for information.) The connection sockets are included as a factory-supplied accessory with the indoor units, or in the case of the 36k

indoor unit, it is factory supplied with the branch distribution units. To install:

1. Remove any caps, etc., that could be on the branch distribution unit.

2. Align the center of the piping sections as seen in the diagram at right.

3. Tighten each piping connection individually following the “Tightening the Flare

Nuts” procedure below.

4. When all piping installation has been completed, perform the triple leak / pressure

and evacuation tests (see the Final Installation Procedures Section), verify that the

system does not have any leaks, and then fully insulate all joints / connections.

Figure 53: Connection Socket Diagram, External View.

Connection Socket

To Branch

Distribution

Connection

To Flared

End of

Field Piping

INSTALLING MULTI F MAX WITH

LGRED SYSTEMS

Refrigerant Piping System Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Figure 54: Socket Connection.

Flare nut

Piping

1. 3/8 in. to 3/8 in.

Connection

2. 3/8 in. to 1/2 in.

Connection

Flare side to

branch distribution unit or outdoor unit

Flare side to indoor unit

Ø3/8 in.

Flare side to indoor

unit

Ø1/2 in.

Connection socket

Flare nut

Piping

Ø3/8 in.

3. 1/2 in. to 5/8 in.

Connection

Ø5/8 in.

Connection socket

Flare nut

Piping

Ø1/2 in.

4. 1/4 in. to 3/8

Connection

Flare side to indoor

unit

Ø3/8 in.

Connection socket

Flare nut

Piping

Ø1/4 in.

Flare side

to branch

distribution unit or outdoor unit

Flare side to indoor

unit

Flare side

to branch

distribution unit or outdoor unit

Flare side

to branch

distribution unit or outdoor unit

INSTALLING MULTI F MAX WITH

LGRED SYSTEMS

Figure 55: Possible Outdoor Unit or Branch Distribution Unit to Indoor Unit Connections.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

The LG-supplied Y-Branch kit PMBL5620 MUST be used when

installing two (2) branch distribution units in parallel on one (1) Multi

F MAX with LGRED system.

Field-supplied fittings are not per-

mitted. Each Y-Branch kit includes two (2) Y-branches (one for the

liquid line and one for the vapor line) and insulation covers.

Y-branches can be installed in horizontal or vertical configurations.

When installed vertically, position the Y-branch so the straight

WKURXJKOHJLVRISOXPE:KHQLQVWDOOHGKRUL]RQWDOO\SRVLWLRQWKH

Y-branch so the take-off leg is level and shares the same horizontal

SODQHDVWKHVWUDLJKWWKURXJKOHJURWDWLRQ

Y-branches must be properly installed following instructions in the

applicable LG manual. Y-branches must always be installed with the

single port facing the outdoor unit and the two-port end facing the

branch distribution units.

Do not install Y-branches backwards

as refrigerant flow cannot make U-turns. The Y-branch kit must be

located at least three (3) feet from the outdoor unit. Provide a min-

imum of 20 inches between a Y-branch and the branch distribution

unit.

When a Y-branch is located in a pipe chase or other concealed

space, access doors must be provided for inspection access.

7KHHTXLYDOHQWSLSHOHQJWKRIHDFK<EUDQFKƍPXVWEHDGGHGWR

the main pipe segment entered into LATS piping design software.

Figure 56: <%UDQFK3RUW,GHQWL¿HU'LDJUDP

Figure 57: Y-Branch Dimensions Diagram.

Figure 58: +RUL]RQWDO&RQ¿JXUDWLRQ(QG9LHZ

Figure 59: <EUDQFK,QVWDOODWLRQ$OLJQPHQW6SHFL¿FDWLRQ

Viewed from A in direction of arrow

Horizontal

plane

Within 5°

Vertical Up

Configuration

Within ± 3°Within ± 3°

Vertical Down

Configuration

A = To Outdoor Unit B = To Branch Distribution Unit

Multi F MAX with LGRED Y-Branch Kit PMBL5620

• Design pressure is 551 psig.

• All dimensions in inches. Tolerance ±1/4 inch.

• Images are not to scale.

Table 30: 0XOWL)0$;ZLWK/*5('<%UDQFK6SHFL¿FDWLRQV

Model Y-Branch Type

3RUW,GHQWLÀHULQFK

123

PMBL5620

Liquid Ø3/8 Ø3/8 Ø3/8

Vapor Ø3/4 Ø3/4 Ø3/4

Y-Branch Type

Dimensions (inch)

Liquid 13.80 3.24

Vapor 12.48 3.02

INSTALLING MULTI F MAX WITH

LGRED SYSTEMS

Refrigerant Piping System Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Special Applications

If an additional drain hose is necessary, the end of drain outlet must

be routed above the ground. Secure the drain hose appropriately.

When the Outdoor Unit is Installed Below the Indoor Unit:

1. Use a conduit, piping set cover, or bundle the (separately) insu-

lated refrigerant piping, the drain hose, and the communications /

connection (power) cable together.

2. Make sure to include some slack in the wiring. Wiring must be

installed in an upwards direction to prevent water from accessing

into the control box.

3. Secure the conduit, piping set cover, or bundle along the outside

wall using saddles or a similar type of piping support.

4. Seal any openings in the wall that are around the piping.

Figure 60: Bundling the Connection Components (From Outdoor Unit to

Indoor Unit / Branch Distribution Unit [Multi F MAX with LGRED systems

only]).

Vinyl tape (narrow)

Connection pipe

Connecting cable

Vinyl tape (wide)

Wrap with vinyl tape

Indoor unit pipe

Pipe

When the Outdoor Unit is Installed Above the Indoor Unit:

1. Use a conduit, piping set cover, or bundle the (separately)

insulated refrigerant piping and the communications / connection

(power) cable together up to the outdoor unit service valves.

2. Make sure to include some slack in the wiring. Wiring must be

installed in upwards direction to prevent water from traveling into

the control box.

3. If necessary, secure the conduit, piping set cover, or bundle

along the outside wall using saddles or a similar type of piping

support.

4. Ensure the insulated drain hose from the indoor unit is installed

away from the outdoor unit, and in a downwards direction. If nec-

essary, secure along the outside wall using saddles or a similar

type of support.

5. Seal any openings in the wall that are around the piping.

Figure 61: Special Applications.

BUNDLING AND SPECIAL

APPLICATIONS

Bundling

If a conduit or piping set cover is not used on the connection from

the outdoor unit to the interior, bundle both insulated refrigerant

pipes, the drain hose, and outdoor unit to indoor unit / branch distri-

bution unit communication / connection (power) cable together with

wide vinyl tape.

1. Piping must be fully encased in insulation material: Overlap the

field installation piping insulation material and the indoor unit

piping insulation material.

2. Bind together the two pipes, using vinyl tape. Make sure there

are no gaps during the binding.

3. Be sure the cutting line is placed upward.

4. Wrap the rear piping section with narrow vinyl tape.

5. Continue to wrap the indoor unit pipe as connected to the outdoor

connection pipe.

6. Using a wider vinyl tape, bundle the piping and drain hose

together.

• Tape must be sufficient to cover the piping in order to fit into the

rear piping housing area at the back of the indoor unit.

Insulation

Drain Hose

Piping

Communication

Cables

Power Wiring

Seal the small access hole

in the wall around the piping.

Outdoor Unit Below Indoor Units

Outdoor Unit Above Indoor Units

Seal the small access hole

in the wall around the piping.

Drainage from the Indoor Units

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Condensate Drain Piping

Outdoor unit requires condensate drain piping. Condensate drain pipe must be constructed with materials approved by local code. See pages

20 to 22 for information in reference to outdoor unit placement and condensate drainage.

Drain Leak Test

A leak test must be performed 24 hours after the drainage system has been installed.

CONDENSATE DRAIN PIPING

)RULQGRRUXQLWFRQGHQVDWHGUDLQSLSLQJLQIRUPDWLRQVHHWKH0XOWL)0XOWL)0$;,QGRRU8QLW(QJLQHHULQJ0DQXDORUWKHLQVWDOODWLRQPDQXDOVSHFL¿F

to the indoor unit type.

Insulation

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

INSULATION

General Piping System Insulation

All refrigerant piping from the outdoor unit to the indoor units /

branch distribution units (Multi F MAX with LGRED systems only)

must be insulated correctly for safety and usage. Y-branch con-

nections, refrigerant piping, field-provided isolation ball valves (if

present), service valves, and elbows must be properly and com-

pletely insulated using closed cell pipe insulation (up to the indoor

unit piping connections). To prevent heat loss / heat gain through

the refrigerant piping, all refrigerant piping including liquid lines and

vapor lines must be insulated separately. Insulation must be a mini-

mum 1/2 inches thick, and thickness will need to be increased based

on ambient conditions and local codes. Table on the next page lists

minimum wall thickness requirements for Ethylene Propylene Diene

Methylene (EPDM) insulation.

)RULQIRUPDWLRQUHJDUGLQJLQVXODWLRQIRUXQGHUJURXQGRUSHQHWUDWLRQVLWXDWLRQVVHHWKH³*HQHUDO5HIULJHUDQW3LSLQJ6\VWHP,QIRUPDWLRQ´VHFWLRQ

Vapor Line

Liquid Line

Communication /

Connection (Power) Cable

e Sleeve

Insulation Material

Insulation

Material

Figure 62: Typical Pipe Insulation, Power Wire and Communications

Cable Arrangement

,QVLGHWKHRXWGRRUXQLWPD[LPXPSLSHWHPSHUDWXUHLV)DQG

PLQLPXPSLSHWHPSHUDWXUHLV))RUILHOGLQVXODWLRQRIUHIULJHUDQW

piping between outdoor units and indoor units, consider the following

pipe temperature ranges for an operating heat pump system:

• +HDWLQJPRGHUHIULJHUDQWWHPSHUDWXUHUDQJHV/LTXLG)

+LJK3UHVVXUH9DSRU)

• &RROLQJPRGHUHIULJHUDQWWHPSHUDWXUHUDQJHV/LTXLG)

/RZ3UHVVXUH9DSRU)

All insulation joints must be glued with no air gaps. Insulation

material must fit snugly against the refrigeration pipe with no air

space between it and the pipe. Insulation passing through pipe

hangers, inside conduit, and/or sleeves must not be compressed.

Protect insulation inside hangers and supports with a second layer.

All pipe insulation exposed to the sun and outdoor elements must be

properly protected with PVC, aluminum vapor barrier, or alternatively

placed in a weather-resistant enclosure such as a pipe rack with a

top cover; or meet local codes. LG-provided Y-branches are shipped

from the factory with pre-formed peel-and-stick foam insulation jack-

ets, with a 1.84 lb./ft.

density, 1/2 inch thickness, and meet UL94

MF-1 flammability.

The design engineer must perform calculations to determine if the

factory-supplied insulation jackets are sufficient to meet local codes

and avoid sweating. Add additional insulation if necessary. Check

the fit of the insulation jacket after the Y-branch fitting and all run-out

pipes are installed.

Figure 63: Typical Insulation Butt-Joint at

Indoor Unit Casing.

Figure 64: Typical Refrigerant

Flare Fitting Insulation Detail.

Surface of

Indoor Unit Casing

Field-Provided

Pipe Insulation

Figure 65: Insulating the Shut Off / Isolation Ball Valve (If Present).

Indoor Unit

Insulation (Field Supplied)

Cable Tie, etc.

(Field Supplied)

Refrigerant Piping

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Minimum Refrigerant Pipe Ethylene Propylene Diene Methylene (EPDM)

Insulation Wall Thickness Requirements

• Do not insulate gas and liquid pipes together as this can result in pipe leakage and malfunction due to extreme temperature

fluctuations.

• Always properly insulate the piping. Insufficient insulation will result in condensation, reduced heating/cooling performance, etc. Also, if the

pipes aren’t insulated properly, condensation could potentially cause damage to building finishes. Pay special attention to insulating the

pipes installed in the ceiling plenum.

• Fully insulate the piping connections.

• Follow local codes and the designer’s instructions when selecting ethylene propylene diene methylene (EPDM) insulation wall thickness.

&ODVVLÀFDWLRQ

Air-conditioned location Non-air conditioned location

1. Typical Conditioned

Location

2. Special Conditioned

Location

3. Typical Unconditioned

Location

4. Special Unconditioned

Location

Liquid pipe

ø1/4 inch

LQFK LQFK LQFK LQFK

ø3/8 inch

¡LQFK LQFK LQFK LQFK LQFK

Vapor pipe

ø3/8 inch

LQFK

LQFK LQFK

LQFK

ø1/2 inch

ø5/8 inch

ø3/4 inch

ø7/8 inch

ø1 inch

ø1-1/8 inches

LQFK

ø1-1/4 inches

LQFK LQFK

ø1-3/8 inches

ø1-1/2 inches

ø1-3/4 inches

Table 31: Minimum Refrigerant Pipe EPDM Insulation Wall Thickness Requirements.

1. Typical Conditioned Location

$EXLOGLQJSOHQXPRUVSDFHWKDWFRQWDLQVFRQGLWLRQHGDLUWKDWGRHVQRWH[FHHG)'%

2. Special Conditioned Location

1. When the location is air conditioned, but there is severe temperature/humidity difference due to high ceilings.

• Church, auditorium, theater, lobby, etc.

2. When the location is air conditioned, but internal temperature/humidity are high.

• Bathroom, swimming pool, locker room, etc.

3. Typical Unconditioned Location

An unconditioned space inside a building.

4. Special Unconditioned Location: If conditions 1 and 2 below are present.

1. An unconditioned space or plenum of a building.

2. An area where there is an elevated humidity level.

The thickness of the above insulation material is based on heat conductivity of 0.61 Btu/in/h/ft

)

INSULATION

5. Additional Insulation for Indoor Units Will be Required in Humid Environments.

The air conditioner factory insulation has been tested according to “ISO Conditions with Mist,” and it satisfies the requirements. If the system

KDVEHHQRSHUDWLQJIRUDORQJWLPHLQDKLJKKXPLGLW\HQYLURQPHQWGHZSRLQWWHPSHUDWXUHPRUHWKDQ)FRQGHQVDWHLVOLNHO\WRIRUP,I

WKLVKDSSHQVLQVWDOOLQFKWKLFN(3'0LQVXODWLRQWKDWLVSOHQXPUDWHGZLWKDKHDWUHVLVWDQFHIDFWRURIPRUHWKDQ)

Insulation

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• Do not insulate gas and liquid pipes together as this can result in pipe leakage and malfunction due to extreme temperature

fluctuations.

• Be sure to fully insulate the piping connections.

INSULATION

Insulation material

Figure 66: Correct Cutting Line Placement.

Installing the Insulation

1. Insulation material must be longer than the refrigerant piping.

Each vapor and liquid piping must be insulated separately.

2. Place the closed-cell ethylene propylene diene methylene

(EPDM) insulation material carefully around each refrigerant pipe

so as not to damage it. Be sure the insulation material cutting line

is placed upward.

3. Apply adhesive to both cut surfaces of the insulation and press

together. Allow adhesive to dry so that the bond is secure and

does not come apart.

Figure 67: Piping with Insulation Material.

Gas or Liquid

Pipe (Insulated

Separately)

Liquid Pipe

Cutting Line

Correct

Incorrect

Insulation

Gas Pipe

Cutti

Insulating Piping Joints

1. Push the EPDM insulation from the straight piping surrounding

the joint (elbow, outdoor unit to indoor unit piping connection

point, etc.) as close together as possible.

2. Cut a piece of insulation to fit the joint, overlapping the insulation

on the surrounding piping by at least one (1) inch.

3. Apply adhesive to bond all the ends.

4. Secure by completely wrapping narrow vinyl tape around the

insulation / joint so that there are no gaps.

5. Tape must be sufficient to cover the piping so it can fit into the

rear piping housing area at the back of the indoor unit or branch

distribution unit (Multi F MAX with LGRED systems only).

Y-Branch Kit Insulation

Each Y-branch kit comes with clam-shell type peel-and-stick insulation jackets molded to fit the Y-branch fittings—one for the liquid line, one

for the vapor line.

• Check the fit of the Y-branch clam-shell

insulation jacket after the Y-branch is

installed.

• Mark all the pipes at the points where the

insulation jacket ends.

• Remove the jacket.

• Install field-provided insulation on the run-

out and main pipes first.

• Peel the adhesive glue protector slip from

the insulation jacket, and install the clam-

shell jacket over the fitting.

Liquid and Gas

Pipe Joints

Y-Branch Kit Insulation

Insulation for

Field-Installed Piping

Field-Supplied Insulation Tape

Figure 68: Y-branch Insulation Detail.

Additional Insulation for Y-Branches Will be Required in Humid Environments.

,IWKHV\VWHPKDVEHHQRSHUDWLQJIRUDORQJWLPHLQDKLJKKXPLGLW\HQYLURQPHQWGHZSRLQWWHPSHUDWXUHPRUHWKDQ)FRQGHQVDWHLVOLNHO\WR

form. If this happens, install 3/8 inch thick ethylene propylene diene methylene (EPDM) insulation that is plenum-rated with a heat-resistance factor

that follows applicable local, state, and federal codes.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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• All power (line voltage) wiring and communication cable installation must be performed by trained service providers working in accordance

with all local, state, and National Electrical Code (NEC) / UL / ETL federal regulations related to electrical equipment and wiring, and follow-

ing the manufacturer product diagrams, requirements, and instructions in this manual. Electric shock can cause physical injury or death.

• Be sure that main power to the unit is completely off before proceeding. Follow all safety and warning information outlined at the beginning

of this manual. Failure to do so will cause electric shock and bodily injury.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously (circuit breaker must be resistant to elec-

tromagnetic currents). Be sure that the circuit breaker or some other emergency power cutoff device is in place before any power wiring is

done to the system. Failure to do so will cause bodily injury or death.

•

Never touch any power lines or live cables before all power is cutoff to the system. To do so will cause bodily injury or death.

• Power wiring and communication cable sizes must comply with all applicable federal, state, and local codes. Undersized wiring will lead to

unacceptable voltage at the unit and will cause a fire, which will cause bodily injury or death.

• Properly ground the outdoor unit, indoor units, and branch distribution units. Ground wiring must always be installed by a trained technician.

Ground wiring is required to prevent accidental electrical shock during current leakage, which will cause bodily injury or death.

• Verify that the circuit breaker is set to OFF before installing the wiring system. Electric shock can cause physical injury or death.

• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and NEC regulations

related to electrical equipment and wiring, and following the instructions in this manual. Generated overcurrent will include some amount of

direct current. Using an oversized breaker or fuse will result in electric shock, physical injury or death.

•

Do not connect ground wire to refrigerant, gas, sewage, or water piping; to lightning rods; to telephone ground wiring; or to the building

plumbing system. Failure to properly provide a NEC-approved earth ground can result in electric shock, fire, physical injury or death.

• Consider ambient conditions (temperature, direct sunlight, inclement weather, etc.) when selecting, installing, and connecting the power wiring.

• Properly ground the outdoor unit, indoor units, and branch distribution units. Ground wiring must always be installed by a trained technician.

Improperly grounded wire can cause communication problems from electrical noise, and motor current leakage.

• Install appropriately sized breakers / fuses / overcurrent protection switches and wiring in accordance with local, state, and NEC regulations

related to electrical equipment and wiring, and following the instructions in this manual. Generated overcurrent will include some amount of

direct current. Using an oversized breaker or fuse will result in equipment malfunction and property damage.

•

Do not connect ground wire to refrigerant, gas, or water piping; to lightning rods; to telephone ground wiring; or to the building plumbing

system. Failure to properly provide a NEC-approved earth ground can result in property damage and equipment malfunction.

•

Do not operate the air conditioning system until the refrigerant piping installation is complete. Operating the system before refrigerant

piping is finalized will damage the compressor.

General Information

ELECTRICAL

Figure 69: Power Wiring and Communication / Con-

nection (Power) Cable Paths (LMU180-240-300HHV

Example).

1. Detach the outdoor unit panel

by loosening the screws.

2. Remove the control cover (if

applicable) by loosening the

screws.

3. Secure the wiring / cable

onto the control board with

the cable clamps.

4. When all connections are

complete, re-attach the

cover control to its original

position using the screws,

then re-attach the outdoor

unit panel.

PowerPower Wiring

Conduit

Hole

Communication /

Connection (Power) Cable

(To Indoor Units)

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Connections

Figure 70: Location of the Power Wiring and Com-

munication Cable Terminals (LMU361-421-480HHV

Example).

Communication / Connection

(Power) Cable Terminal (To

Indoor Units / Branch Distribution

Units)

Power Wiring Terminal

Wiring / Cable

Clamps

Electrical System Installation

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ELECTRICAL

Figure 73: Tightening the Ring Terminal to the

Terminal Plate.

3RZHU:LULQJ&RPPXQLFDWLRQ&DEOH&RQQHFWLRQV

Best practice dictates using solderless ring or fork terminals at all power wiring and com-

munication cable terminations. Use copper bearing ring or fork terminals; do not use

galvanized or nickel plate over steel. Use appropriate crimping tool to attach the ring or fork

terminals at all power wiring and control cable terminations.

To Install a Ring or Fork Terminal:

1. Trim the wiring with wire cutters or pliers, then strip the insulation to expose the strand

wiring to about 3/8 inches.

2. Using a ring terminal fastener or pliers, securely clamp a ring terminal to each stripped

wire end.

Ring Terminal

Wiring / Cable

Figure 71: Close up of a Typical Ring Terminal.

Strip to 3/8"

Ring

Terminal

Connecting Cable

Connecting cable

Loosening the

terminal block

screw

Fastening the

wiring tightly

Figure 72: Adding a Ring Terminal to the

Wiring.

To Connect the Wiring to the Terminals:

1. Remove the JIS terminal screws from the (outdoor unit, branch distribution unit, or indoor

unit) terminal plate with a JIS screwdriver. (See information about LG terminal connec-

tions on the next page.)

2. Position the ring terminal around the terminal, place the terminal screw in the ring, and

tighten to the terminal plate using a JIS screwdriver.

• Firmly attach the wire; secure in a way to prevent external forces from being imparted to

the terminal block.

• Use an appropriately sized JIS screwdriver for tightening the terminals.

•

Do not over tighten the connections; over tightening will damage the terminals.

If ring terminals or fork terminals are not available, then:

•

Do not terminate different gauge wires to the power terminal block. (Slack in the wiring

will generate heat.)

• When terminating wires of the same thickness, follow the instructions demonstrated in the

figures below.

•

Never apply line voltage power to the communications cable terminal block. If contact is made, the PCBs will be damaged.

• Always include some allowance in the wiring length when terminating. Firmly attach the wiring or cable, but provide some slack to facilitate

removing the electrical panels while servicing, and to prevent external forces from damaging the terminal block.

:Copper Wire

Terminate multiple power wires of

the same gauge to both sides.

Do not terminate two wires on

one side.

Do not terminate different gauge

wires to a terminal block.

,ISRZHUZLUHVDUHQRWSURSHUO\WHUPLQDWHGDQG¿UPO\DWWDFKHGWKHUHLVULVNRI¿UHHOHFWULFVKRFNDQGSK\VLFDOLQMXU\RUGHDWK

WARNING

Figure 74: Proper and Improper Power Wiring Connections.

&RQQHFWLRQVDQG6SHFL¿FDWLRQV

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ELECTRICAL

LG Terminal Connections

LG uses a “JIS” type of screw for all terminals; use a JIS screwdriver to tighten and

loosen these screws and avoid damaging the terminal. Do not over tighten the

connections — over tightening will damage the terminals — but firmly and securely at-

tach the wiring in a way to prevent external forces from being imparted to the terminal

block.

• 7KHWHUPLQDOVODEHOHG³*1'´DUH127JURXQGWHUPLQDOV7KHWHUPLQDOVODEHOHG

ARE ground terminals.

• 3RODULW\PDWWHUV$OZD\VFRQQHFW³$´WR³$´DQG³%´WR³%´

• Always create a wiring diagram that contains the exact sequence in which all the indoor units and branch distribution units (Multi F MAX

with LGRED systems only) are wired in relation to the outdoor unit.

•

Do not include splices or wire nuts in the communication cable.

Figure 75: JIS Screws.

• Always have a trained service provider properly ground the outdoor unit. If the outdoor unit is not properly grounded, there is a risk of

electric shock, physical injury, or death.

• Provide a circuit breaker between the power source and the outdoor unit. Failure to do so will cause bodily injury or death.

• Multi F and Multi F MAX with LGRED systems operate at 1Ø, 208-230V, 60Hz, and

power is wired to the outdoor unit only. The outdoor unit will supply power to the indoor

units and the branch distribution units (Multi F MAX with LGRED systems only) through

the communication / connection (power) cable.

• Power supply to the outdoor unit must be selected based on NEC and local codes. Maxi-

mum allowable voltage fluctuation ±10% or nameplate rated value.

• Power wiring to the outdoor unit(s) must be solid or stranded, and must comply with all

local and national electrical codes.

• Properly ground the outdoor unit and indoor unit per NEC and local codes.

• Ground wire must be longer than the common power / communication wires.

• Connect the wiring firmly so the wires cannot be easily pulled out.

• Refer to the inside of the chassis cover or control cover for circuit and terminal block

diagrams.

• Always match color codes of each wire and follow wiring diagram.

•

Do not install power wiring to the outdoor unit and the communication / connection (power) cable to the indoor unit in the same conduit.

Use separate conduits.

3RZHU6XSSO\3RZHU:LULQJ6SHFLILFDWLRQV

Air

Conditioner

Main Power Source

Circuit Breaker

Use a circuit breaker

or time delay fuse

Figure 76: Circuit Breaker

Outdoor Unit

Model

Power Source

Maximum

Overcurrent

Protection

Recommended

Fuse Amps

LMU180HHV 1Ø, 208-230V 30A 25A

LMU240HHV 1Ø, 208-230V 30A 25A

LMU300HHV 1Ø, 208-230V 30A 25A

LMU361HHV 1Ø, 208-230V 40A -

LMU421HHV 1Ø,208-230V 40A -

LMU480HHV 1Ø,208-230V 40A -

Table 32: Circuit Breaker / Fuse Size.

7/16" ± 1/8"

13/16

GN/YL

Power Wiring, Ground

to Outdoor Unit

Figure 77: Multi F / Multi F MAX with LGRED

Outdoor Unit Power Wiring.

&RQQHFWLRQVDQG6SHFL¿FDWLRQV

Electrical System Installation

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MULTI

MAX

MULTI

WITH

&RPPXQLFDWLRQ&RQQHFWLRQ3RZHU&DEOH6SHFLILFDWLRQV

ELECTRICAL

&RQQHFWLRQVDQG6SHFL¿FDWLRQV

• Use a conduit for the communications / connection (power) cable from the outdoor unit to the indoor units and branch distribution unit(s).

Electrical interference my cause product malfunction.

•

Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building. Ground the

communications cable shield only at the outdoor unit. Improperly grounding this cable can cause communications errors.

• The communications / connection (power) cable from the outdoor unit to the indoor units / branch distribution unit(s) must be separated and

isolated from power wiring to the outdoor unit, computers, radio and television broadcasting facilities, as well as medical imaging equip-

ment. Electrical interference my cause product malfunction.

Figure 78: Typical Multi F / Multi F MAX with

LGRED Outdoor and Indoor / Branch Distribution

Unit Wiring and Communications Cable Diagram.

Power Wiring, Ground,

Communication Cable

From Outdoor Unit

To Indoor Unit or from the

Outdoor Unit to the Branch

Distribution Unit

13/16”

GN/YL

GN/YL = (Ground, Yellow)

7/16" ± 1/8"

• Insulation material as required by local code.

• 5DWHGIRUFRQWLQXRXVH[SRVXUHRIWHPSHUDWXUHVXSWR)

• Firmly attach the cable; provide slack but secure in a way to prevent external forces

from being imparted on the terminal block.

• Wiring must be completed without splices.

Multi F with LGRED Systems:

• Communication / connection (power) cable from the outdoor unit to the indoor unit must

use a minimum of 14 AWG, four (4) conductor, stranded, shielded or unshielded (if

shielded, it must be grounded to the chassis of the outdoor unit only), and must comply

with applicable local and national codes.

• Use of 14 AWG, four (4) conductor, stranded, shielded or unshielded wire is allowed for

lengths up to the published maximum pipe length, plus recommended slack at both ends.

Multi F MAX with LGRED Systems:

• All communication / connection (power) cable from the outdoor unit to the branch distribution unit(s) must be a minimum of 14 AWG, four (4)

conductor, stranded, shielded or unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only), and must comply with

applicable local and national codes.

• Communication / connection (power) cable from the branch distribution unit(s) to the indoor units must use a minimum of 14 AWG, four (4)

conductor, stranded, shielded or unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only), and must comply with

applicable local and national codes.

• Use of 14 AWG, four (4) conductor, stranded, shielded or unshielded wire is allowed for lengths up to the published maximum pipe length,

plus recommended slack at both ends.

Figure 79: Typical Multi F with LGRED System General Power / Commu-

nications System Schematic.

Figure 80: Typical Multi F MAX with LGRED System General Power /

Communications System Schematic.

Power Supply

Circuit Breaker

Indoor Unit

Branch Distribution Unit

Ground Wiring

Outdoor Unit

Branch Distribution Unit

Indoor Units

Power Supply

Circuit Breaker

Ground Wiring

Outdoor Unit

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Figure 81: Multi F with LGRED LMU180HHV System Power Wiring and Communications Cable Connections.

Outdoor Unit

L1 L2 3(A)

Outdoor Unit Terminal Block

Power Supply

Main Switch

Circuit Breaker

Fuse

Three-wire Power Wiring

(Including Ground)

COMMUNICATION CABLE

POWER WIRING

1(L1) 2(L2)

Indoor Unit Terminal Block

Unit A Unit B

1(L1) 2(L2) 3

Indoor Unit Terminal Block

1(L1) 2(L2)

3(B)1(L1) 2(L2)

• All field-supplied wiring, components, sizes, and materials must comply with all applicable national, state, and local codes and require-

ments. Improper wiring will result in fire, electric shock, physical injury or death.

• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and

motor current leakage. Do not connect the ground line to the pipes. There is a risk of fire, electric shock, explosion, physical injury or

death.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously. There is a risk of fire, electric shock, explo-

sion, physical injury or death.

• All field-supplied wiring, components, sizes, and materials must comply with all applicable national, state, and local codes and require-

ments. Failure to install proper electrical components can result in property damage and equipment malfunction.

• Ground wiring is required to prevent communication problems from electrical noise, and motor current leakage. Failure to provide proper

ground wiring can result in property damage and equipment malfunction.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously. Failure to install proper electric components

can result in property damage and equipment malfunction.

• Maintain polarity throughout the communication network. The system will malfunction if not properly wired.

Installation

Electrical System Installation

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Figure 82: Multi F with LGRED LMU240HHV System Power Wiring and Communications Cable Connections.

Outdoor Unit

L1 L2 3(A)

Outdoor Unit Terminal Block

Circuit Breaker

Fuse

Three-wire Power Wiring

(Including Ground)

COMMUNICATION CABLE

POWER WIRING

1(L1) 2(L2)

Indoor Unit Terminal Block

Unit A Unit B

1(L1) 2(L2) 3

Indoor Unit Terminal Block

1(L1) 2(L2)

3(B)1(L1) 2(L2)

3(C)1(L1) 2(L2)

Unit C

1(L1) 2(L2) 3

Indoor Unit Terminal Block

L1 L2

Power Supply

Main Switch

• All field-supplied wiring, components, sizes, and materials must comply with all applicable national, state, and local codes and require-

ments. Improper wiring will result in fire, electric shock, physical injury or death.

• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and

motor current leakage.

Do not connect the ground line to the pipes. There is a risk of fire, electric shock, explosion, physical injury or

death.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously. There is a risk of fire, electric shock, explo-

sion, physical injury or death.

• All field-supplied wiring, components, sizes, and materials must comply with all applicable national, state, and local codes and require-

ments. Failure to install proper electrical components can result in property damage and equipment malfunction.

• Ground wiring is required to prevent communication problems from electrical noise, and motor current leakage. Failure to provide proper

ground wiring can result in property damage and equipment malfunction.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously. Failure to install proper electric components

can result in property damage and equipment malfunction.

• Maintain polarity throughout the communication network. The system will malfunction if not properly wired.

ELECTRICAL

Installation

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Figure 83: Multi F with LGRED LMU300HHV System Power Wiring and Communications Cable Connections.

Outdoor Unit

L1 L2 3(A)

Outdoor Unit Terminal Block

Circuit Breaker

Fuse

Three-wire Power Wiring

(Including Ground)

COMMUNICATION CABLE

POWER WIRING

1(L1) 2(L2)

Indoor Unit Terminal Block

Unit A Unit B

1(L1) 2(L2) 3

Indoor Unit Terminal Block

1(L1) 2(L2)

3(B)1(L1) 2(L2)

3(C)1(L1) 2(L2)

Unit C

1(L1) 2(L2) 3

Indoor Unit Terminal Block

L1 L2

Power Supply

Main Switch

3(D)1(L1) 2(L2)

Unit D

1(L1) 2(L2) 3

Indoor Unit Terminal Block

• All field-supplied wiring, components, sizes, and materials must comply with all applicable national, state, and local codes and require-

ments. Improper wiring will result in fire, electric shock, physical injury or death.

• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and

motor current leakage.

Do not connect the ground line to the pipes. There is a risk of fire, electric shock, explosion, physical injury or

death.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously. There is a risk of fire, electric shock, explo-

sion, physical injury or death.

• All field-supplied wiring, components, sizes, and materials must comply with all applicable national, state, and local codes and require-

ments. Failure to install proper electrical components can result in property damage and equipment malfunction.

• Ground wiring is required to prevent communication problems from electrical noise, and motor current leakage. Failure to provide proper

ground wiring can result in property damage and equipment malfunction.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously. Failure to install proper electric components

can result in property damage and equipment malfunction.

• Maintain polarity throughout the communication network. The system will malfunction if not properly wired.

ELECTRICAL

Installation

Electrical System Installation

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Figure 84: Multi F MAX with LGRED LMU361HHV, LMU421HHV, and LMU480HHV System Power Wiring and Communications Cable Connections.

• All field-supplied wiring, components, sizes, and materials must comply with all applicable national, state, and local codes and require-

ments. Improper wiring will result in fire, electric shock, physical injury or death.

• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and

motor current leakage.

Do not connect the ground line to the pipes. There is a risk of fire, electric shock, explosion, physical injury or

death.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously. There is a risk of fire, electric shock, explo-

sion, physical injury or death.

• All field-supplied wiring, components, sizes, and materials must comply with all applicable national, state, and local codes and require-

ments. Failure to install proper electrical components can result in property damage and equipment malfunction.

• Ground wiring is required to prevent communication problems from electrical noise, and motor current leakage. Failure to provide proper

ground wiring can result in property damage and equipment malfunction.

• Install a main shutoff switch or circuit breaker that interrupts all power sources simultaneously. Failure to install proper electric components

can result in property damage and equipment malfunction.

• Maintain polarity throughout the communication network. The system will malfunction if not properly wired.

ELECTRICAL

Installation

L(L1) N(L2)

L(L1) N(L2) L(L1) N(L2) L(L1) N(L2) L(L1) N(L2)

L(L1) N(L2)

S S S S

1(L1) 2(L2) 1(L1) 2(L2) 1(L1) 2(L2) 1(L1) 2(L2)

Indoor Unit Terminal Block

3 3

Outdoor Unit Terminal Block

L(L1)

N(L2)

Power Supply

Outdoor Unit

Main Switch

Circuit Breaker

Three-wire Power Wiring

(Including Ground)

Fuse

* Same Wiring as Branch Distribution Unit (A)

Branch Distribution Unit (B)

3 3

COMMUNICATIONS CABLE

POWER WIRING

L(L1) N(L2)

Branch Distribution Unit (A)

Indoor Unit Terminal Block Indoor Unit Terminal Block Indoor Unit Terminal Block

3(A)1(L1) 2(L2)

3(B)

Lorem ipsum

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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&RQQHFWLQJWKH&RPPXQLFDWLRQV&RQQHFWLRQ3RZHU&DEOHV

1. Detach the outdoor unit panels by loosening the screws.

2. Remove the control cover (if applicable) by loosening the screws.

3. Remove the conduit knock outs on the access holes.

4. Pull the power wiring, and the communications / connection (power) cable into the

outdoor unit (through the conduits, if applicable). Ensure there is enough length to

connect to the terminals on the outdoor unit. Secure any conduits with field-supplied

lock nuts.

5. Connect the power wiring, and the communications / connection (power) cable to the

correct terminals on the outdoor unit.

6. Connect communications / connection (power) cable to the correct control board

terminals on the indoor unit (or branch distribution unit[s] if Multi F MAX with LGRED

system).

7. Follow the wiring diagrams on the outdoor unit and indoor units (or branch distribu-

tion unit[s]) control covers. Ensure that the terminal board numbers and wiring color

on the outdoor unit matches the terminal number and wiring color on the indoor unit

or branch distribution unit(s).

8. Provide strain relief and help protect the connections by (separately) securing the

wiring / cable to the outdoor unit with the factory-supplied clamps (up to 35 lbs.).

Clamps are included near the terminal block. Zip ties can also be used to hold all

cables in place.

9. For more installation information for specific indoor units, refer to the separate indoor

unit installation manuals on www.lghvac.com.

10. When all connections are complete, reattach the control cover to its original position

using the screws, then reinstall the outdoor unit panel.

11.After installation is complete, seal any gaps around the wiring in the panel access

holes or the conduits.

• Always have a trained technician properly ground the outdoor unit. If the outdoor unit

is not properly grounded, there is a risk of electric shock, physical injury, or death.

• )DLOXUHWRSURSHUO\LQVWDOOZLULQJFDQUHVXOWLQHOHFWULFVKRFN¿UHSK\VLFDOLQMXU\RUGHDWK

• Failure to properly provide a NEC-approved earth ground can result in electric shock,

fire, physical injury or death.

• Comply with local and national codes while running the wire from the indoor unit (and

branch distribution units if Multi F MAX with LGRED system) to the outdoor unit (size

of wire and wiring method, etc). Incorrectly sized wiring will cause the terminal to

overheat, generate a fire, and risk physical injury or death.

• All wiring / cable must be firmly connected to its terminals. Loose wiring will cause the terminal to overheat, generate a fire, and risk physical

injury or death.

•

Do not allow the wiring / cable to touch refrigerant tubing, the compressor, or any moving parts. It can result in electric shock, fire,

physical injury or death.

• Replace all control box and panel covers. If cover panels are not installed securely, dust, water and animals may enter the outdoor unit,

causing fire, electric shock, and physical injury or death.

• Ensure the communications / connection (power) cable from the outdoor units to the indoor / branch distribution units, and the power wiring

to the outdoor unit are separate; otherwise, the outdoor unit operation will be affected by electrical noise and will malfunction.

• The communications / connection (power) cable from the outdoor unit to the indoor / branch distribution units must be separated and

isolated from power wiring to the outdoor unit, computers, elevators, radio and television broadcasting facilities, as well as medical imaging

equipment; otherwise, the outdoor unit operation will be affected by electrical noise and will malfunction or fail.

• All wiring / cable must be firmly connected to its terminals. Loose wiring will result in unit malfunction.

ELECTRICAL

Installation

Figure 85: Multi F with LGRED Outdoor Unit Wiring

Connections (LMU300HHV Example).

Lock Nut

(Field Supplied)

Indoor Unit A

Conduit

(Field Supplied)

Indoor Unit B

Indoor Unit C

Indoor Unit D

Conduit

Hole

Power Wiring

(1Ø, 208/230V)

Communication /

Connection (Power)

Cable (1Ø, 208/230V)

Figure 86: Multi F MAX with LGRED Outdoor Unit

Wiring Connections Close Up View.

Communication / Connection

(Power) Cable Terminal (To

Indoor Units / Branch Distribution

Units)

Power Wiring Terminal

Wiring / Cable

Clamps

Electrical System Installation

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Figure 87: Detailed Diagrams of Outdoor Unit PCB Terminal Connections.

ELECTRICAL

Installation

LMU180HHV / LMU240HHV (18 / 24 kBtu/h) LMU300HHV (30 kBtu/h)

L1_BR N1_BL

L(L1) N(L2)

LMU361HHV / LMU421HHV / LMU480HHV (36 / 42 / 48 kBtu/h)

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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General Instructions

• Always connect power wiring / communications cable matching the

branch distribution unit terminals to their respective indoor units

(Example for three-port branch distribution unit PMBD3630: A, B,

and C).

• Follow the instructions on the nameplates and connect wiring /

cables of the outdoor unit and indoor units to the correct terminals.

Always attach each ground wire separately to a grounding screw.

• After completion, secure wiring with wire clamps. Secure wiring

firmly to the indoor unit.

'RQRWXVHWDSSHGZLUHVVWDQGZLUHVH[WHQVLRQFRUGVRUVWDUEXUVWW\SHFRQQHFWLRQVDVWKH\ZLOOFDXVHRYHUKHDWLQJ¿UHHOHFWULFVKRFNphysi-

cal injury or death.

Branch Distribution Unit Wiring Connection Procedure

1. Remove the branch distribution unit control cover. Unscrew the two (2) screws, and slide the cover off the branch distribution frame follow-

ing the arrows in the diagram (Step 1).

2. Pull the communications / connection (power) cable from the outdoor unit so there is enough length to connect to the terminals on the

branch distribution unit. Secure a field-supplied conduit to the branch distribution unit using a field-supplied lock nut on the interior of the

branch distribution unit frame (Step 2). Pull the communication / connection (power) cable through the conduit into the branch distribution

unit.

3. Connect communications / connection (power) cable from the outdoor unit to the branch distribution unit terminals, and from the branch

distribution unit terminals to the indoor unit terminals following the wiring diagram on the outdoor unit control cover (Step 3). Allow 11-3/16

inches of slack in the wire harness. Attach communications / connection (power) cable to the branch distribution unit with clamps at four

(4) locations.

4. Replace the branch distribution unit control cover following the arrows in the diagram. Tighten the two (2) screws to finish (Step 4).

Lock nut (field supply)

Conduit (field supplied)

Lock nut (field supplied)

Step 1

Step 2

Step 3

Step 4

“A” Room

CN-PWR

Connection Wire to Indoor Units Connection Wire from Outdoor Unit

“B” Room

“C” Room

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Distributor Unit (Multi F MAX with LGRED Systems Only)

Always refer to the circuit diagram on the inside of the outdoor unit control cover.

Figure 88: Interior View of a Branch Distribution Unit (Three-Port

PMBD3630 Example Shown).

Figure 89: Branch Distribution Unit Wiring Steps.

ELECTRICAL

Installation

Electrical System Installation

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PI-485

PI-485 V-net Control Integration Board for Outdoor Units adapt Multi F / Multi F MAX with LGRED

systems to a LG VRF system central protocol for integration with LG central controllers. The PI-485 is

installed in the Multi F / Multi F MAX with LGRED outdoor unit. For more information on PI-485 installa-

tion, see the PI-485 installation manual.

Figure 90: PI-485 Board (Ap-

pearance will differ depending on

model).

Figure 91: PI-485 Installation Area in Multi F and Multi F MAX with LGRED Outdoor Units.

ELECTRICAL

Installation

lie

Sub PC

rol

lle

inst

lli

LMU300HHV (30 kBtu/h)

LMU361HHV, LMU421HHV, LMU480HHV (36 / 42 / 48 kBtu/h)

LMU180HHV, LMU240HHV (18 / 24 kBtu/h)

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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From Indoor Units to Remote Controllers

• Communication cable from indoor unit to remote controller(s) is to be LG supplied or field supplied 22 AWG, 3-conductor, twisted, stranded,

unshielded. Wiring must comply with all applicable local and national codes.

• ,IXVLQJWKH/*VXSSOLHGFDEOHDQGWKHOHQJWKQHHGVWREHH[WHQGHGWKH/*([WHQVLRQ.LWVROGVHSDUDWHO\PXVWEHXVHG$PD[LPXPRI

four (4) kits (up to 165 feet) can be used.

• Remote controllers have hardwired connections: SIG - 12V - GND (Comm.) terminals.

• Indoor unit controller connections depend on type of indoor unit being installed. Some indoor units use terminal block connections; other

indoor units use Molex connections. See diagrams below for the two options. Refer to the wiring diagram schematic found in the indoor unit

itself, or to the indoor unit wiring diagrams in the Engineering Manuals for more information.

•

NEVER splice, cut, or extend LG supplied cable with field provided cable. Always include enough cable to cover distance between the

indoor unit and the remote controller.

• Set the indoor unit operating parameters using DIP switches, or by setting up the remote controller. Refer to the indoor unit installation

manuals for more details.

Cable connected to Zone Controller is the factory default connection.

Figure 92: One Example of Indoor Unit to Zone Controller Connection.

BACnet+

BACnet-

BACnet Common

Not used

Common

456

13 14 15

Typical Indoor Unit

Signal

12VDC

CN-REMO

Indoor Unit

Front

CN-REMO

RDBKYL

Back

Figure 93: Another Example of Indoor Unit to Zone Controller

Connection.

ELECTRICAL

Installation

Electrical System Installation

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Between Multiple Indoor Units Operating as a

Group (Group Control)

If any indoor units were specified to operate in unison:

• Before running cable, decide which indoor unit will be the “Main.” The other indoor

units in that group will be designated as “Sub(s).” The zone controller will be connected

to the “Main.”

• Set the pertinent DIP switch at each indoor unit to identify the Main and Sub(s). On

wall mounted indoor unit models, set the assignment using the handheld remote

controller.

• Use a daisy chain configuration and connect all of the group’s indoor units together

starting at the “Main” unit.

•

NEVER splice, cut, or extend cable length with field provided cable. Always

include enough cable to cover distance between all components.

For indoor units with hardwired connections SIG - 12V - GND (Comm.)

terminals:

• From the controller to the main indoor unit, use 22 AWG, 3-conductor, twisted, strand-

ed, unshielded. All wiring must comply with all applicable local / national codes.

• From the main indoor unit to the sub indoor unit(s), daisy chain using 22 AWG, 3-con-

ductor, twisted, stranded, unshielded. All wiring must comply with all applicable local /

national codes.

•(

Do not attach wire to 12VDC terminal to the sub indoor units). All wiring must

comply with all applicable local and national codes.

• NEVER splice, cut, or extend cable length; always include enough cable to cover

distance between all components.

For indoor units with CN-REMO connections:

8VHRQHRUPXOWLSOH*URXS&RQWURO.LWVVROGVHSDUDWHO\FRQWDLQLQJH[WHQVLRQDQG

Y-splitter cables. Use one (1) group control cable kit for each indoor unit in the

group except for the last indoor unit.

NEVER splice, cut, or extend cable

length with field provided cable.

• Cable connected to zone controller is the factory default connection.

• Indoor unit connections depend on indoor unit type.

Figure 94: Example of Indoor Unit Group to Zone

Controller Connections (Sig-12V-GND [Comm.]

Terminal).

Figure 95: Example of Indoor Unit Group to Zone

Controller Connections (CN-REMO).

Main Indoor Unit

Indoor Unit

Signal

12VDC Comm.

Signal

12VDC Comm.

Signal

12VDC Comm.

Signal

12VDC Comm.

CN-REMO

Supplied

LG Supplied Group Control Kit (PZCWRCG3)

Main Indoor Unit

Indoor Unit

Accessory

Model

Number

Image

Wired Remote Group

Control Cable Assembly,

Required for connecting

multiple indoor units to a

control group

PZCWRCG3

Wired Remote/Wired

Remote Extension Cable,

Required for extending

the distance between

indoor units or remote

controllers in a control

group

PZCWRC1

Table 33: Accessories for Some Group Control Applications.

General Specifications

• Wired remote controllers can be connected to all indoor unit types.

• Wireless controllers can be used in conjunction with wired remote controllers.

• A dry contact unit can be connected with a central controller simultaneously.

- The main indoor unit is recognized by the dry contact unit and the central

controller.

- Group Control only available for indoor units manufactured after February 2009.

- The central controller can control indoor units after setting the address of the main indoor unit only.

- Sub indoor unit cannot be individually controlled by central controller.

- Sub indoor unit will operate like main indoor unit.

• If an error occurs with the indoor unit, the error will be displayed on the wired remote controller.

• The following functions are available with group control:

• Selection of operation options (operation/mode/set temperature)

• Control of air flow rate (High/Medium/Low)

ELECTRICAL

Installation

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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7ULSOH/HDN3UHVVXUH7HVW

After the refrigerant piping installation is complete, perform a triple leak / pressure test. Triple leak / pressure test is performed between the

outdoor unit and indoor units (and branch distribution units [Multi F MAX with LGRED only]) to verify that refrigerant can flow through the

system without danger of leaks or pressure losses. Air and moisture that is left in the piping can lead to undesirable results and can cause

damage to the system. It is important to go through a complete leak / pressure cycle to be sure that the refrigerant piping is cleared out. This

process will have to be repeated if any air or moisture be is found to remain in the piping.

• Pressure in the system can rise.

• Operating current can rise.

• Inefficient cooling or heating mode capability.

• Moisture in the refrigerant circuit will freeze and block capillary

tubing.

• Water can lead to corrosion of parts in the system.

Figure 96: Triple Leak / Pressure Test Diagram.

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DANGER

8VLQJFRPEXVWLEOHJDVHVLQFOXGLQJR[\JHQZLOOUHVXOWLQ¿UHRUH[SORVLRQUHVXOWLQJLQSHUVRQDOLQMXU\RUGHDWK8VHLQHUWJDVPHGLFDOJUDGHGU\QLWUR-

gen) when checking leaks, cleaning, installing/repairing pipes, etc. The use of at least 800 psig nitrogen regulator is required for safety.

• Do not apply power to the system before performing a system leak test. There is a possibility that the EEV valve may close and isolate

sections of the piping system, making the leak test inconclusive.

• Never perform the leak test using refrigerant.

• To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder must be higher than its bottom (used in a vertical

standing position) when the system is pressurized.

• Use only a leak-free gauge manifold set.

• Piping system must not be pressured to more than 550 psi. Pressures greater than 550 psi will damage the piping system and cause unit

malfunction.

Triple Leak / Pressure Check Procedure

1. After the refrigerant piping installation is complete, open the isolation ball valves, if

any, that may have been installed in the piping system.

2. Verify that both the liquid and gas (vapor) suction line outdoor unit service ports are

closed, and the stem head access caps are tight. The leak / pressure check is to be

performed only to the refrigerant piping system, and all connected indoor units and

branch distribution units (Multi F MAX with LGRED units only).

3. Remove the caps on both the liquid and gas (vapor) suction Schrader ports. Con-

nect the (medical-grade dry) nitrogen cylinder regulator to a gauge manifold, then

connect the gauge manifold to the Schrader ports on the service ports.

4. Perform the leak / pressure check at 150 psig for fifteen (15) minutes (standing

pressure check).

5. Perform the leak / pressure check at 300 psig for thirty (30) minutes (standing

pressure check).

6. Perform the leak / pressure check at 550 psig for one (1) hour to make sure the

piping system is leak-free. After the gauge reading reaches 550 psig, isolate the

system by first closing the gauge manifold, then close the nitrogen cylinder valve.

Check the flared (and any brazed connections) for leaks by applying a bubble

solution to all joints. Also test for leaks at both service valves.

FINAL INSTALLATION PROCEDURES

Charge Hose

Nitrogen Gas

Cylinder (with

cylinder upright)

Indoor Units

Outdoor Unit

Manifold Valve

Pressure

Gauge

Appearances will vary depending on model.

Service Ports

7ULSOH/HDN3UHVVXUH7HVW

Final Installation Procedures

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Triple Leak / Pressure Check Procedure, continued.

The bubble solution must be a solution designed for refrigerant leak testing. Common soap solution must never be used on refrigerant piping as

those contain chemicals that could corrode copper and brass, and cause product malfunction.

7. If the pressure does NOT drop for one (1) hour, the system passes the test.

8. If the pressure drops, there is a leak and it must be found. Remove the bubble solution with a clean cloth, repair the leak(s), and perform

the leak / pressure check again.

9. After the system has been thoroughly tested and no leaks are present, depressurize by loosening the charging hose connector at the

nitrogen cylinder regulator. When system pressure returns to normal, completely disconnect the charging hose from the cylinder, and

release the nitrogen charge from all refrigerant piping. Wipe off any remaining bubble solution with a clean cloth.

7ULSOH/HDN3UHVVXUHDQG'HHS(YDFXDWLRQ7HVWV

FINAL INSTALLATION PROCEDURES

Deep Evacuation Procedure

On Multi F systems, after the leak / pressure check is complete, the deep evacuation procedure must be performed to the refrigerant piping

and all connected indoor units. On Multi F MAX systems, the triple evacuation procedure (seen on page 74) must be performed. Deep evacu-

ation must be performed through the Schrader ports on the outdoor unit service ports.

The triple evacuation procedure seen on page 74 is a best practices recommendation for Multi F systems, but mandatory for Multi F MAX systems.

For faster evacuation, the Schrader core can be removed, and an auxiliary service port can used. Make sure to re-install the original Schrader core

before operating the system.

• Deep evacuate through both the liquid and gas (vapor) suction Schrader ports on the outdoor unit service ports.

• The outdoor unit service valves must remain closed and the stem head access caps tight.

Do not open the outdoor unit service valves

and release the factory refrigerant charge until trim charge is complete, and the system is ready to operate.

• Any field-installed ball valves in the refrigerant system (if used) must be open to ensure all piping is free and clear for deep evacuation on

all piping and connected indoor units.

• Do not apply power to the system before performing the deep evacuation procedure. There is a possibility that the EEV valve will close

and isolate sections of the piping system, making the deep evacuation procedure inconclusive.

•

Never perform evacuation using refrigerant.

• Use only a vacuum pump that can reach 500 microns, vacuum rated hoses or copper tubing, and a leak-free gauge manifold set.

• Use only new vacuum pump oil from a properly sealed (unopened) container, and change oil in pump before EVERY use.

• Subsequent oil changes will be necessary after several hours of continuous operation; have extra oil on hand.

• Use a quality micron gauge in good operating order and install as far away from pump as possible.

Deep Evacuation Procedure Steps

1. If this procedure is performed shortly after the leak / pressure test, the cap and core on the liquid and gas (vapor) suction Schrader ports

must have already been removed, and the manifold must already be connected. If the procedure was not performed shortly after the leak

/ pressure test, make sure to remove the cap and core on the liquid and gas (vapor) suction Schrader ports. Verify that the service valves

on the outdoor unit are closed, and the stem head access caps are tight.

2. Connect the gauge manifold along with the vacuum pump to the liquid and gas (vapor) suction Schrader ports (with core removed) using a

vacuum hose. Open the gauge manifold and the vacuum pump valves.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Triple Evacuation Procedure

On Multi F MAX systems, after the leak / pressure check is complete, the triple evacuation

procedure must be performed to the refrigerant piping and all connected indoor units /

branch distribution units.

Do not just perform the deep evacuation procedure on Multi F

MAX systems. The deep evacuation procedure is insufficient to fully evacuate the extensive

piping systems on Multi F MAX products. Triple evacuation must be performed through the Schrader ports on the outdoor unit service ports.

The triple evacuation procedure is a best practices recommendation for Multi F systems, but mandatory for Multi F MAX systems.

For faster evacuation, the Schrader core can be removed, and an auxiliary service port can used. Make sure to re-install the original Schrader core

before operating the system.

• Evacuate through both the liquid and gas (vapor) suction Schrader ports on the outdoor unit service ports.

• The outdoor unit service valves must remain closed and the stem head access caps tight.

Do not open the outdoor unit service valves

and release the factory refrigerant charge until trim charge is complete, and the system is ready to operate.

• Any field-installed ball valves in the refrigerant system (if used) must be open to ensure all piping is free and clear for evacuation on all

piping and connected indoor units / branch distribution units.

• Do not apply power to the system before performing the evacuation procedure. There is a possibility that the EEV valve may close and

isolate sections of the piping system, making the evacuation procedure inconclusive.

• Never perform evacuation using refrigerant.

• Use only a vacuum pump that can reach 500 microns, vacuum rated hoses or copper tubing, and a leak-free gauge manifold set.

• Use only new vacuum pump oil from a properly sealed (unopened) container, and change oil in pump before EVERY use.

• Subsequent oil changes will be necessary after several hours of continuous operation; have extra oil on hand.

• Use a quality micron gauge in good operating order and install as far away from pump as possible.

Deep Evacuation Procedure, continued.

3. (YDFXDWHWRVWDWLFPLFURQOHYHOIRUDWOHDVWRQHKRXU

4. 0LFURQOHYHOPXVWUHPDLQIRUWZRKRXUV,IWKHYDFXXPJDXJHULVHVDQGVWRSV

the system may contain moisture; therefore, it will be necessary to repeat the steps of

vacuum break and drying.

5. $IWHUPDLQWDLQLQJWKHV\VWHPLQYDFXXPPLFURQIRUWZRKRXUVFKHFNLIWKH

vacuum gauge rises or not. If it doesn’t rise, then the system is properly evacuated.

6. Close manifold gauges.

7. Shut the valves before turning off and disconnecting the vacuum pump.

Figure 97: Evacuation Procedure Diagram.

Lo Hi

Vacuum Pump

Open

Indoor Units

Outdoor Unit

Manifold Valve

Pressure

Gauge

Service Ports

Appearances will vary depending on model.

'HHS(YDFXDWLRQ7ULSOH(YDFXDWLRQ7HVWV

FINAL INSTALLATION PROCEDURES

Final Installation Procedures

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Triple Evacuation Procedure Steps

1. If this procedure is performed shortly after the leak / pressure test, the cap and core on the liquid and gas (vapor) suction Schrader ports

must have already been removed, and the manifold must already be connected. If the procedure was not performed shortly after the leak

/ pressure test, make sure to remove the cap and core on the liquid and gas (vapor) suction Schrader ports. Verify that the service valves

on the outdoor unit are closed, and the stem head access caps are tight.

2. Connect the gauge manifold along with the vacuum pump to the liquid and gas (vapor) suction Schrader ports (with core removed) using a

vacuum hose. Open the gauge manifold and the vacuum pump valves.

• After the vacuum pump is first operated, if hoses, manifold, and vacuum valves are leak free (and oil is not moisture laden), the gauge must

read <100 microns within one (1) minute.

• Do not proceed if the gauge does not read <100 microns within one (1) minute. There is a leak in the hose, gauge manifold, or vacuum

valve, and the equipment must be replaced.

3. Operate the vacuum pump and evacuate the system to the 2,000 micron level. Isolate the pump by closing the manifold gauges and the

YDFXXPSXPSYDOYHDQGWKHQZDWFKWKHPLFURQOHYHO0LFURQOHYHOZLOOULVHDELWEXW0867HYHQWXDOO\VWRSULVLQJIRU¿IWHHQPLQXWHV

• If the micron level DOES NOT stop rising, there is a leak, and the leak test must be performed again.

• If the micron level DOES rise above 2,000 micron, re-open the manifold gauges and the vacuum pump valve and continue evacuation back

down to 2,000 micron level.

• If the micron level holds at 2,000 micron, continue to step 4.

4. Break vacuum with 50 psig nitrogen purge for an appropriate amount of time (this is to “sweep” moisture from piping).

5. Purge nitrogen from the system until the pressure drops down to 1 to 3 psig.

6. Evacuate to 1,000 micron level. Isolate the pump by closing the manifold gauges and the vacuum pump valve, and then watch the micron

level. Micron level will rise a bit, but MUST eventually stop rising for fifteen (15) minutes.

• If the micron level DOES NOT stop rising, there is a leak, and the leak test must be performed again.

• If the micron level DOES rise above 1,000 micron, re-open the manifold gauges and the vacuum pump valve, and continue evacuation back

down to 1,000 micron level.

• If the micron level holds at 1,000 micron, continue to step 7.

7. Break vacuum with 50 psig nitrogen purge for an appropriate amount of time.

8. Purge nitrogen from the system until the pressure drops down to 1 to 3 psig.

9. (YDFXDWHWRVWDWLFPLFURQOHYHOIRUDWOHDVWRQHKRXU

10. 0LFURQOHYHOPXVWUHPDLQIRURQHKRXU,IWKHYDFXXPJDXJHULVHVDQGVWRSVWKHV\VWHPPD\FRQWDLQPRLVWXUHWKHUHIRUHLWZLOO

be necessary to repeat the steps of vacuum break and drying (Steps 7 through 9).

11. $IWHUPDLQWDLQLQJWKHV\VWHPLQYDFXXPPLFURQIRURQHKRXUFKHFNLIWKHYDFXXPJDXJHULVHVRUQRW,ILWGRHVQ¶WULVHWKHQWKH

system is properly evacuated.

12. Close manifold gauges.

13. Shut the valves before turning off and disconnecting the vacuum pump.

7ULSOH(YDFXDWLRQ7HVW

FINAL INSTALLATION PROCEDURES

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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MULTI

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Refrigerant Charge

LG Multi F and Multi F MAX with LGRED outdoor units ship from the factory with

a charge of R410A refrigerant. A trim charge may need to be added to take into

account additional piping length.

To determine the additional refrigerant that is needed, apply the formulas below,

and record the results. If the total additional refrigerant charge value is a negative

number, then an additional trim charge does not need to be added to the system.

Additional charge (lbs.) = (Installed Length of Branch [A] – Chargeless Pipe Length [L]) x a

+ (Installed Length of Branch [B] – Chargeless Pipe Length [L]) x a

+ (Installed Length of Branch [C] – Chargeless Pipe Length [L]) x a

+ (Installed Length of Branch [D] – Chargeless Pipe Length [L]) x a

- CF (Correction Factor) x 5.29

Outdoor

Unit Model

Min. to Max. Piping

Length for One

Branch (ft.)

Max. Total System

Piping Length (ft.)

Chargeless Pipe Length

per Branch (L) (ft.)

Piping Length (No Additional

Refrigerant [ft])

Additional Charge

Needed (a) (oz./ft.)

LMU180HHV 9.8 to 82 164 24.6 49.2 0.22

LMU240HHV 9.8 to 82 246.1 24.6 73.8 0.22

LMU300HHV 9.8 to 82 246.1 24.6 98.4 0.22

Outdoor Unit

Factory Charge

oz. of R410A

LMU180HHV 98.8

LMU240HHV 112.8

LMU300HHV 112.8

LMU361HHV 183.4

LMU421HHV 183.4

LMU480HHV 183.4

Table 34: Outdoor Unit Factory Charge.

Multi F with LGRED Systems

• Number of installed length of branches depends on the specifications of the outdoor unit model.

• CF = Maximum number of connectible indoor units – Total number of connected indoor units.

Table 35: 0XOWL)ZLWK/*5('2XWGRRU8QLW3LSLQJ6SHFL¿FDWLRQV

Figure 98: Multi F with LGRED Additional Refrigerant Charge Example.

FINAL INSTALLATION PROCEDURES

Each branch pipe

A = 82 ft.

B = 16 ft.

C = 49 ft.

Additional Charge

9,000

Example: LMU300HHV

= (82 - 24.6) x 0.22

+ (16 - 24.6) x 0.22

+ (49 - 24.6) x 0.22

- (4 - 3) x 5.29

= 10.82 oz.

Final Installation Procedures

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

MAX

MULTI

WITH

Refrigerant Charge

Multi F MAX with LGRED Systems

Outdoor Unit Model

Main Piping Length Branch Piping Length

Chargeless Pipe Length

of Main Pipe (L) (ft.)

Additional Charge

Needed (a) (oz./ft.)

Chargeless Pipe Length of

%UDQFK3LSHȉ%IW

Additional Charge

Needed (b) (oz./ft.)

LMU361HHV 49.2 0.54 131.2 0.22

LMU421HHV 49.2 0.54 131.2 0.22

LMU480HHV 49.2 0.54 131.2 0.22

Table 36: 0XOWL)0$;ZLWK/*5('2XWGRRU8QLW3LSLQJ6SHFL¿FDWLRQV

Additional charge (lbs.) = (Total Main Piping Length [A] - Chargeless Pipe Length of Main Pipe [L]) x a

+ (Total Installed Length of Branch [B1+B2+B3...] – Chargeless Branch Length [B]) x b

- CF (Correction Factor) x 3.53

• Number of installed length of branches depends on system specifications.

• CF = Maximum number of connectible indoor units – Total number of connected indoor units

Figure 99: Multi F MAX with LGRED Additional Refrigerant Charge Example.

FINAL INSTALLATION PROCEDURES

18,000 9,000 9,000

LMU421HHV

• Total main pipe (A) = 90 ft.

• Each branch pipe

B1 =

B2 =

B3 =

B4 =

B5 =

Additional Charge

= (90 - 49.2) x 0.54

+ (116 - 131.2) x 0.22

– (6 - 5) x 3.53

= 15.16 oz.

49 ft.

17 ft.

10 ft.

23 ft.

BD Unit

9,000 18,000

B1 B2

B4 B5

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Refrigerant Charge

1. Determine the additional refrigerant amount that is needed, Trim Charge, applying the necessary formulas as outlined in the previous

pages.

2. Connect the charging cylinder to the charge hose on the manifold valve.

3. Purge air from the charge hose by opening the valve at the bottom of the cylinder, and press the check valve on the manifold valve.

4. Confirm that the “Lo” knob of the manifold valve is open and charge the system with liquid refrigerant. (Because R-410A is a non-azeo-

trope refrigerant, it must be charged in the liquid state.)

• If the required amount of refrigerant cannot be charged all at once, the refrigerant can be charged a little at a time (approximately 5.29

ounces) while the system operates in cooling. This procedure must be repeated until the entire amount of refrigerant gets charged into

the system; perform once, then wait approximately one [1] minute before resuming.

5. Immediately disconnect the charge hose from the service port on the three-way valve. Stopping halfway allows the refrigerant to

discharge.

• If the system has been charged with liquid refrigerant while it operates, turn the system off before disconnecting the hose.

6. Mount the valve stem nuts and the service port nut. Use torque wrench to tighten the service port nut to a torque of 1.8 kg.m and check

for leaks.

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The presence of foreign substances such as air can cause an abnormal pressure rise and will result in explosion and physical injury.

Refrigerant

Cylinder

Outdoor Unit

Indoor Unit

Liquid Piping

Gas Piping

Open

Three-Way

Valve

Three-Way

Valve

OPEN

Open

Check Valve

(One)

Vacuum

Gauge

Figure 100: Charging the Refrigerant.

Refrigerant Charge

FINAL INSTALLATION PROCEDURES

Final Installation Procedures

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MULTI

MAX

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WITH

Amount of

Factory-Charged

Refrigerant per

Outdoor Unit

Amount of

Additional

Refrigerant

Trim Charge

Refrigerant Concentration Limit (RCL) Calculations

To calculate total refrigerant amount per system:

&DXWLRQVIRU5HIULJHUDQW/HDNV,QWURGXFWLRQ

ASHRAE Standards 15 and 34 offer guidelines that address refrigerant safety and the maximum allowable concentration of refrigerant in an

occupied space. Refrigerant will dissipate into the atmosphere, but a certain volume of air is required for this to occur safely. For R410A re-

frigerant, the maximum allowable concentration is 0.026 lbs./ft

per 1,000 ft

of air in an occupied space. Buildings with twenty-four (24) hour

occupancy allow half of that concentration.

ASHRAE Standards 15 and 34 assume that if a system develops a leak, its entire refrigerant charge will dump into the area where the leak

occurs. To meet ASHRAE Standards 15 and 34, calculate the refrigerant concentration that will occur in the smallest room volume on

the system, and compare the results to the maximum allowable concentration number (see below for information on how to calculate the

refrigerant concentration).

Also consult state and local codes in regards to refrigerant safety.

American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. (ASHRAE). Atlanta, GA. ASHRAE, Inc. Information about

ASHRAE Standard 15 / 34 and addenda current as of the date of this publication.

Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or destroy R410A refrigerant according to applicable US

EPA rules.

Total System

Refrigerant

Charge

+ =

To calculate the potential refrigerant concentration level (RCL):

1. Measure the occupied space dimensions (in feet).

2. Calculate the cubic foot volume of air in the smallest occupied

space. (To obtain a detailed overview of the RCL, perform the

same calculations to the second smallest zone, the third smallest

zone until the RCL is obtained for all zones. Also, pay special

attention to areas such as basements, etc., where refrigerant

cannot dissipate easily.)

3. Divide the refrigerant charge of the Multi Zone system serving the

area in pounds by the results of step 1.

4. If the calculation indicates that the potential refrigerant concen-

tration level is higher than the allowed RCL, increase the cubic

volume of the smallest occupied space or modify the piping

system design.

5. The allowable RCL limit for most applications must be equal to

or less than 0.026 lbs./ft

. However, in special occupied spaces,

such as hospitals and nursing homes, where occupants will have

limited mobility, the allowable RCL limit is cut in half. See ASHRAE

Standard 34 and local codes for detailed information.

RCL (lbs./ft

) =

Total System Refrigerant Charge (lbs.)

Volume of Smallest Occupied Space (ft

)

Verify the maximum refrigerant concentration level in the space where the indoor unit will be mounted meets the concentration limit for the

application. If the refrigerant leaks and safety limits are exceeded, it could result in personal injuries or death from oxygen depletion.

Outdoor Unit

Direction of Refrigerant Flow

Indoor Unit

Zone into which the

entire charge of

refrigerant leaks.

Indoor Unit Indoor Unit

Indoor Unit

Figure 101: Example of R410A Refrigerant Leak Location.

Cautions for Refrigerant Leaks

FINAL INSTALLATION PROCEDURES

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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To determine the volume of an occupied space, the designer must also determine which ones are connected, not connected, or ventilated

(refer to Standard 34).

If the calculated RCL is above the allowable limit, there are two primary methods used to lower the RCL:

1. Increase the volume of the occupied space.

2. Decrease the size of the refrigerant charge.

Per Standard 34-2007, acceptable methods used to increase the volume of an occupied space include:

• Install transfer ducts between rooms.

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• $GGDQRSHQLQJZLWKRXWDGRRUSDUWLWLRQVRIFXELFYROXPHRIVSDFHZLWKLQD]RQH

• ,QFOXGHYHQWLODWLRQJULOOHVLQGRRUVLQFOXGHYHQWLODWLRQLQOHWVRXWOHWVSDUWLWLRQVRIFXELFYROXPHRIVSDFHZLWKLQD]RQH

• ,QFOXGHWKHDUHDDERYHWKHFHLOLQJDVSDUWRIWKHUHWXUQRUVXSSO\DLUSDWKSDUWLWLRQVRIFXELFYROXPHRIVSDFHZLWKLQD]RQH

• Install a mechanical ventilator linked to a gas leak detector.

• Change the indoor unit type (wall mounted to ceiling cassette) / position.

Figure 102: Examples of Zones.

Figure 103: Example of Acceptable Ventilation Methods.

Mechanical Ventilator Linked

to a Gas Leak Detector

Ventilation Inlet / Outlet

Indoor Unit

Smallest Zone

in System

Indoor Unit Indoor Unit

Outdoor Unit

Indoor Unit

Opening

Partition

Zone includes partition

(but no door), or includes

openings ≥0.15% of floor

volume (openings can be

located both above and

below the door)

Outdoor Unit

Indoor UnitIndoor Unit Indoor Unit Indoor Unit

Without Partition. With Partition / With Opening to

Adjoining Room.

With Partition / Without Opening to

Adjoining Rooms.

Cautions for Refrigerant Leaks

FINAL INSTALLATION PROCEDURES

See also the LG HVAC Building Ventilation Guide on www.lghvac.com.

Final Installation Procedures

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MULTI

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Test Run

After the triple leak / pressure and evacuation procedures are com-

plete, perform a test run.

Before the Test Run

1. Check that all condensate tubing, refrigerant piping and power

wiring, and communication / connection (power) cables are prop-

erly connected.

2. Make sure that the gas and liquid service valves are fully open.

Refrigerant

Type

Outside Ambient

Temperature

Gas Side Service

Valve Pressure

R410A ) 120~135 psig

If the pressure is >135 psig, the system is most likely overcharged, and refrigerant must be removed. If the pressure is <120 psig, the system is most

likely undercharged and refrigerant must be added.

Outlet

Temperature

Discharge Air

Inlet Temperature

Outlet

Temperature

Discharge Air

Inlet Temperature

Outlet

Temperature

Discharge Air

Inlet Temperature

Figure 104: Piping Connection on the Outdoor Unit (Will Differ Depend-

ing on Outdoor Unit Model).

Figure 105: Inlet and Outlet Temperature Locations on Various Indoor Units.

Installing the Remote Controller Batteries

As part of the test run, the batteries need to be inserted into the remote

controller, and the remote controller will need to be powered on to

operate the indoor units (depending on the indoor units included in the

system). To insert the batteries follow the steps below. For information

on using the remote controller, refer to its owner’s manual.

1. The remote controller needs two (2) AAA (1.5V) batteries for oper-

ation.

Do not use rechargeable batteries. Remove the battery

cover from the back of the remote controller by pushing downward

on the tab at the top of the battery cover and then lift up to remove.

2. Insert the two new batteries. Align batteries by the (+) and (-) sides (the interior battery compartment of the remote controller will have

clear markings for the (+) and (-) placement).

3. Verify that the batteries have “clicked” into the compartment and are firmly engaged with the contacts on either side.

4. Reattach the back cover of the remote controller.

5. Proceed with powering on the remote controller and usage as needed.

Test Run Procedure

1. Operate the system in cooling mode for 15 to 20 minutes.

2. Evaluate performance as the system runs, verifying the outdoor unit, and all indoor units and branch distribution units (Multi F MAX with

LGRED systems only) are working properly. Make notes as needed to address any issues that might be found.

• Check the system refrigerant charge:

• Measure the pressure from the gas side service valve.

• Measure the indoor unit inlet and outlet air temperatures. Verify the difference between the intake temperature and the discharge is

PRUHWKDQ)

• See table below for the optimum condition of the gas side pressure (again, system is in cooling mode).

Figure 106: Installing the Remote Controller Batteries.

Table 37: Optimum Conditions of the Gas Side Pressure.

Mounting

Bolt

Piping Connections

Test Run

FINAL INSTALLATION PROCEDURES

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Outdoor Unit DIP Switch Settings

System must be powered off, and then turned back on to apply DIP switch settings.

Turn off the circuit breaker or shut off the power source of the product before setting the DIP

switch. There is risk of physical injury or death due to electric shock.

• Unless the applicable DIP switch is set properly, the system will not work.

• If a specific function is desired, request that the installer set the appropriate DIP switch

during installation.

• Only the first four DIP switches are functional on the LMU361, 421, 480HHV.

',36ZLWFK6HWWLQJVIRU2SWLRQDO0RGHV

Figure 107: LMU180, 240, 300HHV Outdoor Unit

DIP Switches (in Normal Operation Setting).

Table 38: DIP Switch Settings and Functionalities.

DIP Switch Setting Function

Normal Operation (No Function)

Forced Cooling Operation

Wiring Error Check

Reducing Power Consumption (Step 1)

Reducing Power Consumption (Step 2)

Mode Lock (Cooling)

Mode Lock (Heating)

Night Quiet Mode (Step 1)

Night Quiet Mode (Step 2)

Mode Lock (Cooling) + Night Quiet Mode (Step 1)

Mode Lock (Cooling) + Night Quiet Mode (Step 2)

Reducing Power Consumption (Step 1) with Mode Lock (Cooling)

Reducing Power Consumption (Step 2) with Mode Lock (Cooling)

Reducing Power Consumption (Step 1) with Mode Lock (Heating)

Reducing Power Consumption (Step 2) with Mode Lock (Heating)

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

12 43

OFF

Figure 108: LMU361, 421, 480HHV Outdoor Unit DIP

Switches (in Normal Operation Setting).

12 43

OFF

FINAL INSTALLATION PROCEDURES

12 43

OFF

Final Installation Procedures

Due to our policy of continuous product innovation, some specifications may change without notification.

MULTI

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Forced Cooling Operation Function

Use to add refrigerant to the system when outside ambient temperatures are cool (ex.: winter).

1. Shut power down to the system.

2. Set DIP Switch 1 to ON.

3. Turn power on to the system.

4. Verify that the Red LED on the outdoor unit PCB is ON (indicates

indoor units are in forced cooling operation).

5. Add refrigerant.

• If the green LED light on the outdoor unit PCB is ON, it indicates the compressor is OFF due to low pressure in the system.

• Turn DIP Switch 1 to OFF after finishing (Normal Operation setting).

• Only the first four DIP switches are functional on the LMU361, 421, 480HHV.

Location of DIP Switches on Multi F and Multi F MAX Outdoor Units

Figure 109: Multi F with LGRED (LMU180-240-300HHV)

Outdoor Unit DIP Switch Locations.

12 43

OFF

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FINAL INSTALLATION PROCEDURES

1234

OFF

Figure 110: Multi F MAX with LGRED (LMU361-421-480HHV) Outdoor Unit

DIP Switch Locations.

Figure 111: LMU180-240-300HHV Forced Cooling DIP Switch Setting. Figure 112: LMU361-421-480HHV Forced Cooling DIP Switch Setting.

LMU180 / 240 / 300HHV

(18 / 24 / 30kBtu/h)

SW1

DIP_SW01D

LMU361HHV / LMU421HHV / LMU480HHV

(36 / 42 / 48 kBtu/h)

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Wiring Error Check

Use to verify if wiring is properly installed.

1. Shut power down to the system.

2. Set DIP Switch 2 to ON.

3. Turn power on to the system.

4. Check if the Red and Green LEDs on the outdoor unit PCB are ON (indicate indoor

units are in forced operation mode).

5. If the wiring is correctly installed, the Green LED will light up. If the wiring is incorrect-

ly installed, the Red and Green LEDs will blink, indicating which part of the system is

in error.

• Red LED = Piping Number

• Green LED = Wiring Number (Room)

Example: If the Red LED blinks twice and the Green LED blinks three times, the second

piping to the third room is in error (see right).

• If the indoor unit(s) is/are not communicating properly to the outdoor unit, the Wiring

Error Check cannot operate correctly.

• Only the part of the system in error will be displayed. System will operate correctly after

the error is fixed.

• If outdoor and indoor temperatures are too low (ex.: winter), the Wiring Error Check

function will not operate (Red LED is ON).

• Turn DIP Switch 2 to OFF after finishing (Normal Operation setting).

• Only the first four DIP switches are functional on the LMU361, 421, 480HHV.

12 43

OFF

Figure 113: LMU180-240-300HHV Wiring Error

Check DIP Switch Setting.

One (1)

Second

LED 1

(Red)

LED 2

(Green)

Three (3)

Blinks

Two (2)

Blinks

One (1)

Second

One (1)

Second

One (1)

Second

Two (2)

Blinks

Three (3)

Blinks

Figure 114: LMU361-421-480HHV Wiring Error

Check Example.

Reducing Power Consumption

Enables more efficient system operation by reducing the maximum power consumption

value (reducing the MCA).

1. Shut power down to the system.

2. For Step 1, set only DIP Switch 3 to ON.

3. For Step 2, set only DIP Switch 4 to ON.

4. Turn power on to the system.

Table 39: Reducing Power Consumption Current Levels.

Phase 1Ø

Model

Multi F with LGRED

LMU180HHV,

LMU240HHV,

LMU300HHV,

Multi F MAX with LGRED

LMU361HHV,

LMU421HHV,

LMU480HHV

Step 1 (A) 12 22

Step 2 (A) 10 21

Power

Consumption

and Current

Normal

Time

Figure 115: Wiring Error Check Example.

12 43

OFF

12 43

OFF

Step 1 Step 2

Figure 116: Reducing Power Consumption Chart.

',36ZLWFK6HWWLQJVIRU2SWLRQDO0RGHV

• Reduced Power Consumption reduces outdoor unit capacity.

• Only the first four DIP switches are functional on the LMU361, 421,

480HHV.

FINAL INSTALLATION PROCEDURES

Figure 117: LMU180-240-300HHV Reducing Power Consumption DIP

Switch Settings.

1234

OFF

Figure 118: LMU361-421-480HHV Reducing Power Consumption DIP

Switch Settings.

1234

OFF

1234

OFF

Step 1

Step 2

Final Installation Procedures

Due to our policy of continuous product innovation, some specifications may change without notification.

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Figure 119: LMU180-240-300HHV Saving Power Consumption with Mode Lock DIP Switch Settings.

12 43

OFF

Reducing Power Consumption with Mode Lock

Enables more efficient system operation by lowering the maximum power consumption value, as well as locks the mode of operation (Exam-

ple: In a cooling-only server room application where permission to adjust the system mode is highly limited). Changing modes can cause a

change in compressor frequency, which would cause problems with the setting. As such, if this mode is used, it is locked in either cooling or

heating. The function is rarely, if ever, used.

1. Shut power down to the system.

2. Set DIP Switches as indicated below, following the steps and chosen mode.

3. Turn power on to the system.

Step 1: Reducing Saving Power Consump-

tion + Mode Lock (Cooling).

Step 2: Reducing Saving Power Consump-

tion + Mode Lock (Cooling).

12 43

OFF

Step 1: Reducing Saving Power Consump-

tion + Mode Lock (Heating).

Step 2: Reducing Saving Power Consump-

tion + Mode Lock (Heating).

12 43

OFF

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',36ZLWFK6HWWLQJVIRU2SWLRQDO0RGHV

FINAL INSTALLATION PROCEDURES

Figure 120: LMU361-421-480HHV Saving Power Consumption with Mode Lock DIP Switch Settings.

Step 1: Reducing Saving Power Consumption + Mode Lock

(Cooling).

Step 2: Reducing Saving Power Consumption + Mode Lock

(Cooling).

Step 1: Reducing Saving Power Consumption + Mode Lock

(Heating).

Step 2: Reducing Saving Power Consumption + Mode Lock

(Heating).

12 43

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Mode Lock

Prevents mixed mode operation (mode change) in applications

where only one mode is necessary.

1. Shut power down to the system.

2. For Only Cooling Mode Lock, set only DIP Switches 1 and 2 to

ON. For Only Heating Mode Lock, set only DIP Switches 3 and 4

to ON.

3. Turn power on to the system.

12 43

OFF

Only Cooling Mode Lock Only Heating Mode Lock

12 43

OFF

Figure 122: LMU361-421-480HHV Night Quiet Mode DIP Switch Settings.

2QO\WKH¿UVWIRXU',3VZLWFKHVDUHIXQFWLRQDORQ

the LMU361, 421, 480HHV.

Night Quiet Mode

Lowers the operation sound of the outdoor unit by changing the com-

pressor frequency and fan speeds. Night quiet mode initiates eight

(8) hours after the highest outdoor air temperature is measured, then

is active for nine (9) hours.

1. Shut power down to the system.

2. For Step 1, set only DIP Switches 1 and 4 to ON.

3. For Step 2, set only DIP Switches 2 and 3 to ON.

4. Turn power on to the system.

Figure 121: LMU180-240-300HHV Night Quiet Mode DIP Switch Settings.

12 43

OFF

Step 1

12 43

OFF

Step 2

FINAL INSTALLATION PROCEDURES

',36ZLWFK6HWWLQJVIRU2SWLRQDO0RGHV

Figure 123: LMU180-240-300HHV Mode Lock DIP Switch Settings.

Figure 124: LMU361-421-480HHV Mode Lock DIP Switch Settings.

Only Cooling Mode Lock

Only Heating Mode Lock

Step 1

Step 2

1234

OFF

1234

OFF

1234

OFF

1234

OFF

Operation sound: Step 1 > Step 2.

• If compressor frequency and fan speed are decreased, cooling capacity may also decrease.

• Night Quiet Mode can only be used when system is in cooling operation.

• Change the DIP switches if Night Quiet Mode is no longer desired.

• ,ILQGRRUXQLWRSHUDWLRQLVVHWE\WKHIDQVSHHG³3RZHU´1LJKW4XLHW0RGHZLOOQRWIXQFWLRQXQWLOIDQVSHHG³3RZHU´LVFKDQJHG

• Only the first four DIP switches are functional on the LMU361, 421, 480HHV.

Final Installation Procedures

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FINAL INSTALLATION PROCEDURES

• If compressor frequency and fan speed are

decreased, cooling capacity may also decrease.

• Night Quiet Mode can only be used when system is in cooling operation.

• Change the DIP switches if Night Quiet Mode is no longer desired.

• ,ILQGRRUXQLWRSHUDWLRQLVVHWE\WKHIDQVSHHG³3RZHU´1LJKW4XLHW0RGHZLOOQRWIXQFWLRQXQWLOIDQVSHHG³3RZHU´LVFKDQJHG

• Only the first four DIP switches are functional on the LMU361, 421, 480HHV.

Night Quiet Mode with Mode Lock

Lowers the operation sound of the outdoor unit by changing the

compressor frequency and fan speeds, as well as locks the mode of

operation. Changing modes can cause a change in compressor fre-

quency, which would cause problems with the setting. As such, if this

mode is used, it is locked in either cooling or heating. The function

is rarely, if ever, used. Night quiet mode initiates eight (8) hours after

the highest outdoor air temperature is measured, then is active for

nine (9) hours.

1. Shut power down to the system.

2. For Step 1, set only DIP Switches 2 and 4 to ON.

3. For Step 2, set DIP Switches 1 and 3 to ON.

4. Turn power on to the system.

12 43

OFF

Step 1: Night Quiet Mode + Mode Lock

(Cooling)

Step 2: Night Quiet Mode + Mode Lock

(Cooling)

12 43

12 4

OFF

Figure 125: LMU180-240-300HHV Night Quiet Mode with Mode Lock DIP

Switch Settings.

Figure 126: LMU361-421-480HHV Night Quiet Mode with Mode Lock DIP Switch Settings.

Step 1: Night Quiet Mode + Mode Lock (Cooling)

Step 2: Night Quiet Mode + Mode Lock (Cooling)

1234

OFF

1234

OFF

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Table 40: Night Quiet Mode + Mode Lock Settings.

Type Model Number Night Quiet Standard Cooling Sound Level (dBA) Step 1 (dBA) Step 2 (dBA)

Multi F with LGRED

LMU180HHV ODU DIP Switch 50 48 45

LMU240HHV ODU DIP Switch 52 48 45

LMU300HHV ODU DIP Switch 52 48 45

Multi F MAX with LGRED

LMU361HHV ODU DIP Switch 53 51 47

LMU421HHV ODU DIP Switch 54 51 47

LMU480HHV ODU DIP Switch 54 51 47

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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PCB Display

The cycle data can be checked without using LG Monitoring View (LGMV) Diagnostic Software by pushing TACT-SW1 on some models. See

below for the types of cycle information that will be displayed in LGMV. After first page is displayed, the second page will be subsequently

displayed.

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shock.

TACT-SW1

No. of Pushes

Description

Display

Example First Page Second Page

One (1) Time Low Pressure 890kpa “LP” “89”

Two (2) Times High Pressure 2,900kpa “HP” “290”

Three (3) Times Discharge Temperature & “DS” “85”

Four (4) Times Condenser Outlet Temperature & “CS” “-10”

Five (5) Times Suction Temperature & “SS” “-10”

Six (6) Times Outdoor Unit Air Temperature & “AS” “-10”

Seven (7) Times Current 15A “A” “15”

Eight (8) Times Voltage 230V “V” “230”

Nine (9) Times Compressor Hz 100Hz “F” “100”

Ten (10) Times DC Link Voltage 230V “dc” “230”

Table 41: PCB Display Information.

Figure 127: Location of TACT-SW1.

FINAL INSTALLATION PROCEDURES

',36ZLWFK6HWWLQJVIRU2SWLRQDO0RGHV

TACT-SW1

LMU180HHV / LMU240HHV / LMU300HHV

(18 / 24 / 30 kBtu/h)

LMU361HHV / LMU421HHV / LMU480HHV

(36 / 42 / 48 kBtu/h)

This PCB does not include a TACT-SW1, however

cycle information can be viewed using LGMV.

Error Codes

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Error Code Description Indoor Unit Operation Status

00 No error ON

01 Indoor unit room temperature sensor error OFF

02 Indoor unit inlet pipe sensor error OFF

03 Controller error OFF

04 Drain pump error (optional) OFF

05 Communication error between indoor unit and outdoor units OFF

06 Indoor unit outlet pipe sensor error OFF

07 Different mode operation error OFF

09 Indoor unit EEPROM error OFF

10 Indoor unit BLDC motor fan lock OFF

Figure 128: Example of Standard Wall-Mounted Indoor Unit LEDs.

Figure 129: Example of Art Cool Mirror Wall-Mounted Indoor Unit

LEDs.

Table 42: Wall-Mounted Indoor Unit Error Codes.

ERROR CODE TABLES

Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and

service troubleshooting of the Multi F / Multi F MAX with LGRED product.

Appearances will vary depending on model.

Cooling

Heating

Preheating

LED 1

(ONES PLACE)

Standard Wall Mounted

LED 2

(TENS PLACE)

Receiver

Power

Plasma

Preheating

Artcool Mirror

LED 1

(ONES PLACE

LED 2

(TENS PLACE

)

Receiver

Troubleshooting Using Error Codes

Refer to the tables below and on the next pages for error codes that

are generated from the indoor and outdoor units. These codes indi-

cate different types of unit failures, assist in self-diagnosis, and are

the most common that will manifest themselves on the LEDs. Error

codes are displayed on indoor unit LEDs, wired remote controllers,

the outdoor unit PCB, and through LG Monitoring View (LGMV)

diagnostic software.

Systems could generate additional codes not listed here. Contact LG

Support if these types of errors are seen and a simple power down

and boot up has not corrected the issue.

Do not attempt to fix

the system yourself.

• If two or more errors occur simultaneously, the highest error code

number is displayed first.

• After the error is corrected, the error code will cease to display

without user intervention.

Decoding the Error Display

See images and table below for indoor unit error codes, location of

LEDs, and operation status.

The first and second number on the LED indicates error number. Ex-

ample: 21 = LED1 (Red light) 2x blink, LED2 (Green light) 1x blink.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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Figure 130: Ceiling Cassette Display.

ERROR CODE TABLES

Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and

service troubleshooting of the Multi F / Multi F MAX with LGRED product.

Decoding Four-Way Ceiling Cassette Error Codes

• Error codes on the LED flash ON / OFF as presented in the table below.

• If two or more errors occur simultaneously, the highest priority error code is displayed.

• After error is resolved, the error code is simultaneously released and does not display.

• To operate the system again after an error code occurs and has been resolved, cycle the power.

• Error code displays differ depending on model.

Error

Code

Description Cause

1 Indoor unit air temperature sensor error

Indoor unit air temperature sensor is disconnected or shorted.

2 Indoor unit inlet pipe temperature sensor error Indoor unit inlet pipe temperature sensor is disconnected or shorted.

Communication error between wired remote controller and indoor

unit

Indoor unit PCB is not receiving communications signal from wired

remote controller.

4 Drain pump error. Drain pump is malfunctioning.

5 Communication error between indoor unit and outdoor unit

Indoor unit communications PCB is not receiving signal from outdoor

unit communications PCB.

6 Indoor unit outlet pipe temperature sensor error

Indoor unit outlet pipe temperature sensor is disconnected or shorted.

9 Indoor unit EEPROM error Serial number on EEPROM of indoor unit is 0 or FFFFFF.

10 Indoor unit fan motor operation error

Fan motor connector has been disconnected. Indoor fan motor lock

has failed.

Table 43: Four-Way Ceiling Cassette Indoor Unit LED Indications.

Four-Way Ceiling Cassette Indoor Unit Error Indicator

Description LED Color

Cooling Mode Green

Heating Mode Green

Time to Clean Filter (When Unit is Operating In Cooling or Heating Mode) Yellowish Green

Time to Clean Filter (When Unit Is Not Operating) Orange

Hot Start or Defrost Mode before Starting Heating Mode Green

When Reservation Set Is On Yellowish Green

Table 44: Four-Way Ceiling Cassette Indoor Unit Error Codes.

LED

Forced Operation

Button

Error Codes

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Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and

service troubleshooting of the Multi F / Multi F MAX with LGRED product.

ERROR CODE TABLES

Error

Code

Description

No. of Times Outdoor Unit LEDs

Blink

Outdoor

Operation

Status

LED01 (Red) LED02 (Green)

21 DC Peak (IPM Fault); Compressor DC voltage is too high 2X 1X OFF

22 Current Transformer2 (CT2) error; Alternating current (AC) input is too high 2X 2X OFF

DC Link Low Voltage (DC Link Voltage is <140VDC)

2X 3X OFF

DC Link High Voltage (DC Link Voltage is >420VDC)

25 AC Low / High Voltage 2X 5X OFF

26 DC Compressor Position Error (Compressor failed to start properly) 2X 6X OFF

27 PSC / PFC Fault; Input current to inverter compressor PCB is too high 2X 7X OFF

29 Current to inverter compressor is too high 2X 9X OFF

32 Inverter compressor discharge pipe (D-Pipe) temperature is too high 3X 2X OFF

35 Low Pressure Error; Pressure dropped below recommended limits 3X 5X OFF

39 Communication Error between PFC MICOM and Inverter MICOM 3X 9X OFF

40 CT Sensor Error; Thermistor is open or has short circuited 4X - OFF

41 Inverter compressor discharge pipe (D-Pipe) sensor is open or has short circuited 4X 1X OFF

43 High pressure sensor is open or has short circuited 4X 3X OFF

44 Outdoor air sensor is open or has short circuited 4X 4X OFF

45 Mid-pipe thermistor of outdoor unit condenser is open or has short circuited 4X 5X OFF

46 Outdoor unit suction piping thermistor is open or has short circuited 4X 6X OFF

48 Outlet piping (liquid) of condenser is open or has short circuited 4X 8X OFF

Combination ratio (capacity) is out of range; Total nominal indoor unit capacity is<50%

or >130% of the outdoor unit capacity

5X 1X OFF

53 Communication failure between outdoor unit and indoor unit(s) 5X 3X OFF

54 Outdoor unit is not wired properly (ex: reversed phase) 5X 4X OFF

60 Outdoor unit printed circuit board (PCB) EEPROM check sum error 6X - OFF

61 Condenser coil thermistor temperature is too high 6X 1X OFF

62 Outdoor unit inverter compressor PCB heat sink temperature is too high 6X 2X OFF

65 Heat sink thermistor is open or has short circuited 6X 5X OFF

67 Outdoor unit brushless direct current (BLDC) fan motor lock error 6X 7X OFF

73 Outdoor unit PFC overcurrent (peak) error 7X 3X OFF

Table 45: Outdoor Unit Error Codes.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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• Images on these pages are examples of LGMV screenshots. Actual images will differ depending on the version of the software and the units

installed.

• Information displayed also depends on which unit is installed.

LG Monitoring View (LGMV) Diagnostic Software

LG Monitoring View (LGMV) software allows the service technician

or commissioning agent to connect a computer USB port to the Multi

F / Multi F MAX with LGRED system’s main printed circuit board

(PCB) using an accessory cable without the need for a separate

interface device.

LGMV is available in different formats, including Mobile LGMV,

which is an app for use on wireless devices. Contact your LG Sales

Representative for more information, including recommended PC or

mobile device configurations.

LGMV Display

LGMV displays the following real-time data:

• Actual inverter compressor speed

• Target inverter compressor speed

• Actual outdoor fan speed

• Target outdoor unit fan speed

• Actual superheat

• Target superheat

• Actual subcooler circuit superheat

• Target subcooler circuit superheat

• Main EEV position

• Subcooling EEV position

• Inverter compressor current transducer value

• Outdoor air temperature

• Actual high pressure/saturation temperature

• Actual low pressure/saturation temperature

• Suction temperature

• Inverter compressor discharge temperature

• Constant speed compressor discharge temperature

• Front outdoor coil pipe temperature

• Back outdoor coil pipe temperature

• Liquid line pipe temperature

• Subcooler inlet temperature

• Subcooler outlet temperature

• Average indoor unit (IDU) pipe temperature

• Inverter compressor operation indicator light

• Four-way reversing valve operation

indicator light

• Pressure graph showing actual low pressure and actual high pres-

sure levels

• Error code display

• Operating mode indicator

• Target high pressure

• Target low pressure

• PCB (printed circuit board) version

• Software version

• Installer name

• Model no. of outdoor units

• Site name

• Total number of connected indoor units

• Communication indicator lights

• Indoor unit capacity

• Indoor unit operating mode

• Indoor unit fan speed

• Indoor unit EEV position

• Indoor unit room temperature

• Indoor unit inlet pipe temperature

• Indoor unit outlet pipe temperature

• Indoor unit error code

Figure 131: LGMV Monitoring Screen.

LG MONITORING VIEW (LGMV)

DIAGNOSTIC SOFTWARE

Error Codes

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• Inverter compressor

- Amps

- Volts

- Power Hz

- Inverter control board fan Hz

• Constant compressor

- Current transducer value

- Phase

Figure 132: LGMV Graph Screen.

Additional screens can be accessed by tabs on the main screen.

Additional screens include:

1. Cycleview: Graphical display of internal components including:

• Compressors showing actual speeds

• EEVs

• Indoor units

• Liquid injection valves

• Temperature and pressure sensors

• Four-way reversing valve

• Outdoor fans showing status and speeds

2. Graph: Full screen graph of actual high and low pressures and

high and low pressure limits. A sliding bar allows viewing of

previously recorded data.

3. Control IDU: Enables user to turn on IDUs with default setpoints

RI)LQKHDWLQJPRGHRU)LQFRROLQJPRGH

4. Setting: Converts metric values to imperial values.

5. Making Data: Recording of real time data to a separate file

created to be stored on the user’s computer.

6. Loading Data: Recorded data from a saved “.CSV” file can be

loaded to create an LGMV session.

7. Electrical Data: The Electric tab on the main screen is changed to

show the following:

Figure 133: LGMV Cycleview Screen.

LG MONITORING VIEW (LGMV)

DIAGNOSTIC SOFTWARE

• Images on these pages are examples of LGMV screenshots. Actual images will differ depending on the version of the software and the units

installed.

• Information displayed also depends on which unit is installed.

MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual

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MAINTENANCE RECOMMENDATIONS

It is also recommended to monitor system operation using LGMV and / or SIMS Software at least once a year.

Table 46: Maintenance Recommendations.

Component Maintenance Occurrence (Minimum)

Indoor Units

Wash filters On a regular basis / as needed

Clean coils Once a year

Clean / check unit base pan Once a year

Outdoor Unit(s) Clean coils Once or twice a year

Communications Cable and Power Wiring

Verify that all cables and wiring are properly

connected

Once or twice a year

Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.

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INSTALLATION CHECKLIST

PAGE 1

Major Component Rough-In

Description Check

Multi F / Multi F MAX with LGRED outdoor unit was connected properly per local code and the product installation procedures.

All literature and bagged accessories have been removed from the fan discharge vicinity (ducted and cassette model indoor

units).

All indoor units and branch distribution unit(s) (Multi F MAX with LGRED only) are installed, properly supported, and located

indoors in a non-corrosive environment.

Duct work installation has been completed per product installation procedures (ducted indoor units only).

Piping Material, Components, and Insulation

Description Check

Multi-zone duct-free split systems: ACR copper piping rated at the system working pressure was used.

LG Y-branch fitting was used per manufacturer’s recommendations (Multi F MAX with LGRED only).

All refrigerant pipes and valves were insulated separately. Insulation is positioned up against the walls of the indoor units and

branch distribution units (Multi F MAX with LGRED only). No gaps shown. Insulation was not compressed at clamps and hangers.

Brazing Practices

Description Check

Use medical grade dry nitrogen for purging during brazing (constant 3 psig while brazing).

15% silver brazing material only.

Refrigerant Piping Design and System

Description Check

You must have in your possession a copy of the “As-Designed” LATS Multi V piping tree diagram. BEFORE ANY FIELD PIPE

SIZE OR LENGTH CHANGES ARE MADE, PROPOSED CHANGES MUST BE FORWARDED TO THE DESIGN ENGINEER SO

THAT THEY CAN INPUT THE CHANGES INTO LATS and RE-ISSUE A NEW LATS MULTI V PIPING TREE DIAGRAM. Installer

must receive change authorization from the design engineer, because any change made requires the review of the entire tree

diagram and verification that the change did not impact the size of piping segments in other parts of the system.

All pipe materials were properly stored, capped, and clean. All burrs were removed after cutting and pipe ends were reamed

before brazing.

During refrigerant pipe installation, for each segment of pipe, a record was made of the pipe length (including expansion loops,

offsets, double-back sections), and sizes, as well as the quantity and type of elbows used.

Expansion loops, coils or other acceptable measures are provided where necessary to absorb temperature-change based pipe

movement.

A torque wrench and backup wrench were used to tighten all flare connections.

The back side of all flares were lubricated with a small drop of PVE refrigeration oil before tightening flare fittings.

(QVXUHDOOILHOGPDGHIODUHVDUH8VHIDFWRU\VXSSOLHGIODUHQXWVRQO\

Pipe segments and Y-branch fittings are secured to the structure using a combination of fixed and floating clamps, and all wall

penetrations were sleeved.

Pipe insulation was not compressed at any point.

Y-branch fittings were properly INSTALLED per details provided in the Multi F / Multi F MAX with LGRED Outdoor Unit Installation

Manual.

Y-branch fittings were properly SUPPORTED per details provided in the Multi F / Multi F MAX with LGRED Outdoor Unit Installa-

tion Manual.

No oil traps, solenoid valves, sight glasses, filter driers, or any other unauthorized refrigerant specialties were present.

(Optional) High quality R-410A rated full port ball valves (Schrader between the valve body and the indoor units) used at all indoor

units and at will in the refrigerant piping network.

MULTI

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INSTALLATION CHECKLIST

PAGE 2

Condensate Pump / Drain Installation

Description Check

Condensate piping is installed correctly on indoor units. Material used is acceptable under local code. Insulated as necessary to

prevent condensation.

All condensate vertical risers are equal to or less than 27-1/2 inches from the bottom of the indoor unit.

Indoor units with condensate pumps are level. Units with gravity drains are level or slightly canted toward the drain connection

and are supported properly.

Pumped condensate drain lines are properly connected (

do not have traps, and connect to the top surface of the main drain

line).

Multi F / Multi F MAX with LGRED gravity condensate drain line is connected and routed where it properly drains away or, if

installed in a mechanical room, was connected and properly routed to a drain connection.

All condensate lines are properly insulated to prevent condensation.

Power Wire and Communications Cables

Description Check

Ground wire is installed and properly terminated at the unit.

Power wiring is connected to a single phase 208-230V source.

The power supplied is clean with voltage fluctuations within specifications (±10% of nameplate).

Power wiring to the Multi F / Multi F MAX with LGRED outdoor unit is field supplied, solid or stranded, and installed per all local,

state, and NEC requirements.

For Multi F with LGRED Systems

• Communication / connection (power) wiring from the outdoor unit to the indoor unit is minimum 14 gauge, four-conductor, stranded,

shielded or unshielded. If shielded, must be grounded to chassis at the outdoor unit only.

• Use of 14 AWG, four (4) conductor, stranded, shielded or unshielded wire is allowed for lengths up to the published maximum

pipe length, plus recommended slack at both ends.

For Multi F MAX with LGRED Systems

All power wiring / communication cable to be minimum 14 AWG from the Multi F MAX with LGRED outdoor unit to the BD unit

stranded, shielded or unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only), and must comply with

applicable local and national codes.

• Communication / connection (power) wiring from the BD unit to the indoor unit is minimum 14 gauge, four-conductor, stranded,

shielded or unshielded. If shielded, must be grounded to chassis at the BD unit only.

• Use of 14 AWG, four (4) conductor, stranded, shielded or unshielded wire is allowed for lengths up to the published maximum

pipe length, plus recommended slack at both ends.

Power wiring to the outdoor unit and communication / connection (power) cable from the outdoor unit to the indoor units or branch

distribution units (Multi F MAX with LGRED only) are separated per manufacturer’s guidelines. These cannot be run in the same

conduit.

Communications / connection (power) cable were not ran in the same conduit (outdoor unit to indoor unit or branch distribution

unit (Multi F MAX with LGRED only) as provided in the product installation manual.

Proper communications cable was used between each indoor unit and its zone controller where applicable. Cables are continuous

with no splices between terminals.

Communication type RS-485–BUS type.

Used appropriate crimping tool to attach ring or fork terminals at all power wiring and control cable terminations.

Only LG-supplied Y-cables are used between grouped indoor units, if applicable.

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INSTALLATION CHECKLIST

PAGE 3

Major Component Rough-In

Piping and Insulation

Brazing Practices

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INSTALLATION CHECKLIST

PAGE 4

Installation—Refrigerant Piping

Installation—Branch Distribution Unit (Multi F MAX with LGRED Systems

Only)

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Installation—Power Wire and Communications Cables

MULTI

MAX

MULTI

WITH

MULTI F WITH LGRED

REFRIGERANT CHARGE WORKSHEET

LG Multi F with LGRED outdoor units ship from the factory with a charge of R410A

refrigerant. A trim charge may need to be added to take into account additional

piping length.

To determine the additional refrigerant that is needed, apply the formula below,

and record the results. If the total additional refrigerant charge value is a negative

number, then an additional trim charge does not need to be added to the system.

Additional charge (lbs.) = (Installed Length of Branch [A] – Chargeless Pipe Length [L]) x a

+ (Installed Length of Branch [B] – Chargeless Pipe Length [L]) x a

+ (Installed Length of Branch [C] – Chargeless Pipe Length [L]) x a

+ (Installed Length of Branch [D] – Chargeless Pipe Length [L]) x a

- CF (Correction Factor) x 5.29

Multi F Outdoor Unit

Model

Min. to Max. Piping Length

for One Branch (ft.)

Max. Total System Piping

Length (ft.)

Chargeless Pipe Length

per Branch (L) (ft.)

Additional Charge Needed

(a) (oz./ft.)

LMU180HHV 9.8 to 82 164 24.6 0.22

LMU240HHV 9.8 to 82 246.1 24.6 0.22

LMU300HHV 9.8 to 82 246.1 24.6 0.22

Outdoor Unit Factory Charge oz. of R410A

LMU180HHV 98.8

LMU240HHV 112.8

LMU300HHV 112.8

Multi F with LGRED Outdoor Unit Factory

Charge

• Number of installed length of branches depends on the specifications of the outdoor unit model.

• CF = Maximum number of connectible indoor units – Total number of connected indoor units.

Multi F with LGRED Outdoor Unit Piping Specifications

(________[A] – 24.6) x 0.22 (________)

+ (________[B] – 24.6) x 0.22 + (________)

+ (________[C] – 24.6) x 0.22 + (________)

+ (________[D] – 24.6) x 0.22 + (________)

- ________CF x 5.29 - (________)

= ________ Additional Charge (oz.)

Multi F with LGRED Refrigerant Charge Calculations

Multi F with LGRED Outdoor Unit Additional Refrigerant Charge Formula

MULTI

MAX

MULTI

WITH

Multi F MAX with LGRED Outdoor Unit Piping Specifications

• Number of installed length of branches depends on system specifications.

• CF = Maximum number of connectible indoor units – Total number of connected indoor units

MULTI F MAX WITH LGRED

REFRIGERANT CHARGE WORKSHEET

LG Multi F MAX with LGRED outdoor units ship from the factory with a charge

of R410A refrigerant. A trim charge may need to be added to take into account

additional piping length.

To determine the additional refrigerant that is needed, apply the formula below,

and record the results. If the total additional refrigerant charge value is a negative

number, then an additional trim charge does not need to be added to the system.

Multi F MAX with LGRED Outdoor Unit

Factory Charge

(________[A] – 49.2) x 0.54 (________)

+ (________[B1+B2+B3...] – 131.2) x 0.22 + (________)

- ________CF x 3.53 - (________)

= ________ Additional Charge (oz.)

Multi F MAX with LGRED Refrigerant Charge Calculations

Outdoor Unit Model

Main Piping Length Branch Piping Length

Chargeless Pipe Length

of Main Pipe (L) (ft.)

Additional Charge

Needed (a) (oz./ft.)

Chargeless Pipe Length

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Additional Charge

Needed (b) (oz./ft.)

LMU361HHV 49.2 0.54 131.2 0.22

LMU421HHV 49.2 0.54 131.2 0.22

LMU480HHV 49.2 0.54 131.2 0.22

Outdoor Unit Factory Charge oz. of R410A

LMU361HHV 183.4

LMU421HHV 183.4

LMU480HHV 183.4

Additional charge (lbs.) = (Total Main Piping Length [A] - Chargeless Pipe Length of Main Pipe [L]) x a

+ (Total Installed Length of Branch [B1+B2+B3...] – Chargeless Branch Length [B]) x b

- CF (Correction Factor) x 3.53

IM_MultiF_MAX_LGRED_ODU_1HHV_480HHV_01_22

Supersedes: IM_MultiF_MAX_LGRED_ODU_1HHV_480HHV_11_21

IM_MultiF_MAX_LGRED_ODU_11_20

IM_MultiF_MAX_LGRED_ODU_09_20

IM_MultiF_MAX_LGRED_ODU_06_20

IM_MultiF_MAX_LGRED_ODU_04_20

IM_MultiF_MAX_LGRED_ODU_05_18

LG Electronics, U.S.A., Inc.

Air Conditioning Technologies

4300 North Point Parkway

Alpharetta, Georgia 30022

LG Electronics LMU421HHV LG Air Conditioner Cooling Area,

Product's Documents

User Manual

Specifications

LG Electronics LMU421HHV Questions and Answers