LG Electronics LSN180HSV4 LG Air Conditioner Cooling Area, User Manual

STANDARD WALL-MOUNTED INDOOR UNIT

INSTALLATION MANUAL

MUL

• LMN077HVT 7 kBtu

• LSN090HSV4 9 kBtu

• LSN120HSV4 12 kBtu

• LMN157HVT 15 kBtu

• LSN180HSV4 18 kBtu

• LMN247HVT 24 kBtu

The instructions included in this manual must be followed to prevent prod-

uct malfunction, property damage, injury, or death to the user or other

people. Incorrect operation due to ignoring any instructions will cause

harm or damage. A summary of safety precautions begins on page 4.

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

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

Content familiarity required for proper installation.

For more technical materials such as submittals, engineering

databooks, and catalogs, visit www.lghvac.com.

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

©LG Electronics U.S.A., Inc.

This document, as well as all reports, illustrations, data, information, and other materials are the property of LG Electronics U.S.A., Inc.

PROPRIETARY DATA NOTICE

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.

IM-Multi-F_StdWallMount-03-15

Installation Manual

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TABLE OF CONTENTS

CONTENTS

Safety Instructions ........................................................................................................................................... 4

Introduction ...................................................................................................................................................... 9

Unit Nomenclature ......................................................................................................................................... 11

General Data ................................................................................................................................................. 12

Specications ............................................................................................................................................................. 13

Typical Multi F/Multi F Max Systems .......................................................................................................................... 15

Refrigerant Piping Requirements ............................................................................................................................... 17

General Installation Guidelines ...................................................................................................................... 18

Location Selection ...................................................................................................................................................... 18

Inspection ................................................................................................................................................................... 19

Refrigerant Piping ....................................................................................................................................................... 22

Piping Materials and Handling .................................................................................................................................... 30

Piping Preparation ...................................................................................................................................................... 31

Piping Connections ........................................................................................................................................ 32

IDU to ODU ................................................................................................................................................................ 32

Piping Insulation ......................................................................................................................................................... 35

Drain Piping ................................................................................................................................................................ 37

Electrical Wiring ............................................................................................................................................. 38

Power Wiring Specications and Best Practices ........................................................................................................ 39

Power Wiring Specications and Best Practices/Controller Options 40

Indoor Unit Electrical Connections Guidelines ........................................................................................................... 41

Indoor Unit Electrical Connections Procedure ............................................................................................................ 42

Self Diagnosis Functions ........................................................................................................................................... 44

LG SIMS - Self Diagnosis Functions ......................................................................................................................... 46

Optional Wall-Mounted Sensor and Controller ........................................................................................................... 48

Troubleshooting ............................................................................................................................................. 49

Error Codes ............................................................................................................................................................... 49

Cautions for Refrigerant leaks ....................................................................................................................... 51

Refrigerant Leaks ....................................................................................................................................................... 51

Installation Checklist ...................................................................................................................................... 52

Multi F Standard Wall-Mounted Indoor Unit

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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 below.

SAFETY INSTRUCTIONS

WARNING

Do not install, remove, or re-install the unit by yourself

(end-user). Ask the dealer or an LG trained technician to

install the unit.

Improper installation by the user may result in water leakage, re,

explosion, electric shock, physical injury or death.

For replacement of an installed unit, always contact an

LG trained service provider.

There is risk of re, electric shock, explosion, and physical injury or death.

The outdoor unit is shipped with refrigerant and the service

valves closed. Do not open service valves on the unit until

all non-condensibles have been removed from the piping

system and authorization has been obtained from the com-

missioning agent.

There is a risk of physical injury or death.

Do not run the compressor with the service valves closed.

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

Periodically check that the outdoor unit is not damaged.

There is risk of explosion, 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 unit, causing re, electric shock, and physical injury or death.

Always check for system refrigerant leaks after the unit has

been installed or serviced.

Exposure to high concentration levels of refrigerant gas may lead to

illness or death.

Do not install the unit using defective hanging, attaching, or

mounting hardware.

There is risk of physical injury or death.

Wear protective gloves when handling equipment.

Sharp edges may cause personal injury.

Dispose of the packing materials safely.

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

may cause puncture wounds or other injuries.

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

may not play with them and risk suffocation and death.

Do not install the unit in any location exposed to open ame

or extreme heat. Do not touch the unit with wet hands.

There is risk of re, electric shock, explosion, and physical injury or death.

Install the unit considering the potential for earthquakes.

Improper installation may cause the unit to fall, resulting in physical

injury or death.

Do not change the settings of the protection devices.

If the pressure switch, thermal switch, or other protection device is

shorted and forced to operate improperly, or parts other than those

specied by LG are used, there is risk of re, electric shock, explosion,

and physical injury or death.

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

sures to prevent the refrigerant concentration from exceed-

ing 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 re-

frigerant leaks and safety limits are exceeded, it could result in personal

injuries or death from oxygen depletion.

DANGER

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

serious injury.

WARNING

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

serious injury.

CAUTION

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

moderate injury.

Note:

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

This symbol indicates an action that should not be performed.

TABLE OF SYMBOLS

INSTALLATION

DANGER

Don’t use or store ammable gas or combustibles near the unit.

There is risk of re, explosion, and physical injury or death.

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CAUTION

Be very careful when transporting the product.

• Do not attempt to carry the product without assistance.

• Some products use polypropylene bands for packaging. Do not use polypropylene bands to lift the unit.

• Suspend the unit from the base at specified positions.

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

• Failure to follow these directions may result in minor or moderate physical injury.

SAFETY INSTRUCTIONS

INSTALLATION – CONTINUED

Note:

Properly insulate all cold surfaces to prevent “sweating.”

Cold surfaces such as uninsulated pipe can generate condensate that may

drip and cause a slippery oor condition and/or water damage to walls.

When installing the unit in a hospital, mechanical room, or

similar electromagnetic eld (EMF) sensitive environment,

provide sufcient protection against electrical noise.

Inverter equipment, power generators, high-frequency medical equip-

ment, or radio communication equipment may cause the air conditioner to

operate improperly. The unit may also affect such equipment by creating

electrical noise that disturbs medical treatment or image broadcasting.

Do not use the product for special purposes such as preserv-

ing foods, works of art, wine coolers, or other precision air

conditioning applications. This equipment is designed to

provide comfort cooling and heating.

There is risk of 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 become damaged.

Do not install the unit in a noise sensitive area.

When connecting refrigerant tubing, remember to allow for

pipe expansion.

Improper piping may cause refrigerant leaks and system malfunction.

Take appropriate actions at the end of HVAC equipment life

to recover, recycle, reclaim or destroy R410A refrigerant ac-

cording to applicable U.S. Environmental Protection Agency

(EPA) rules.

Periodically check that the outdoor unit is not damaged.

There is a risk of equipment damage.

Install the unit in a safe location where no one can step on

or fall onto it. Do not install the unit with defective hanging,

attaching, or mounting hardware.

There is risk of unit and property damage.

Install the drain hose to ensure adequate drainage.

There is a risk of water leakage and property damage.

Don’t store or use ammable gas / combustibles near the

unit.

There is risk of product failure.

Always check for system refrigerant leaks after the unit has

been installed or serviced.

Low refrigerant levels may cause product failure

The unit is shipped with refrigerant and the service valves

closed. Do not open service valves on the unit until all non-

condensibles have been removed from the piping system

and authorization to do so has been obtained from the com-

missioning agent.

There is a risk of refrigerant contamination, refrigerant loss and equip-

ment damage.

Multi F Standard Wall-Mounted Indoor Unit

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SAFETY INSTRUCTIONS

WIRING

DANGER

High voltage electricity is required to operate this system.

Adhere to the National Electrical Codes and these

instructions when wiring.

Improper connections and inadequate grounding can cause accidental

injury or death.

Always ground the unit following local, state, and National

Electrical Codes.

Turn the power off at the nearest disconnect before servicing

the equipment.

Electric shock can cause physical injury or death.

Properly size all circuit breakers or fuses.

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

WARNING

The information contained in this manual is intended for use

by an experienced, trained electrician 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, property damage, personal injury or

death.

Ensure the unit is connected to a dedicated power source

that provides adequate power.

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

formed properly, it may result in re, electric shock, physical injury or death.

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

of sufcient current capacity and rating.

Wires that are too small may generate heat and cause a re.

Secure all eld wiring connections with appropriate wire

strain relief.

Improperly securing wires will create undue stress on equipment power

lugs. Inadequate connections may generate heat, cause a re and

physical injury or death.

Properly tighten all power connections.

Loose wiring may overheat at connection points, causing a re, physical

injury or death.

Note:

Do not cut, lengthen or shorten the communications and power

cable between any dry contact unit and its connected indoor

unit. Do not install the unit in a location where the communica-

tions and power cable cannot be safely and easily connected

between the two units. Do not allow strain on this cable.

Poor cable connections can cause equipment malfunction.

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OPERATION

DANGER

Do not provide power to or operate the unit if it is ooded or

submerged.

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

Use a dedicated power source for this product.

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

Do not operate the disconnect switch with wet hands.

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

Periodically verify the hanging bolts and other hardware

securing the unit have not deteriorated.

If the unit falls from its installed location, it can cause property damage,

product failure, physical injury or death.

If refrigerant gas leaks out, ventilate the area before operat-

ing the unit.

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

and the system develops a refrigerant leak, it may cause re, electric

shock, explosion, physical injury or death.

SAFETY INSTRUCTIONS

Note:

Clean up the site after installation is nished, and check

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

inside or surrounding the unit.

Do not use this equipment in mission critical or special-

purpose applications such as preserving foods, works of art,

wine coolers or refrigeration. This equipment is designed to

provide comfort cooling and heating.

Provide power to the compressor crankcase heaters at least

six (6) hours before operation begins.

Starting operation with a cold compressor sump(s) may result in severe

bearing damage to the compressor(s). Keep the power switch on during

the operational season.

Do not block the inlet or outlet.

Unit may malfunction.

Securely attach the electrical cover to the indoor unit. Non-

secured covers can result in re due to dust or water in the

service panel.

Periodically verify the equipment mounts have not deterio-

rated.

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

product failure.

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

There is risk of unit failure.

WARNING

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

There is risk of unit failure, re, electric shock, physical injury or death.

Avoid excessive cooling and periodically perform ventilation

to the unit.

Inadequate ventilation is a health hazard.

Do not touch the refrigerant piping during or after operation.

It can cause burns or frostbite.

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

cover(s) removed; keep ngers and clothing away from

moving parts.

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

physical injury or death.

Periodically check power cable and connection for damage.

Cable must be replaced by the manufacturer, its service agent, or similar

qualied persons in order to avoid physical injury and/or electric shock.

Do not open the inlet grille of the unit during operation. Do

not operate the unit with the panels or guards removed. Do

not insert hands or other objects through the inlet or outlet

when the unit is powered. Do not touch the electrostatic lter,

if the unit includes one. The unit contains sharp, rotating,

hot, and high voltage parts that can cause personal injury

and/or electric shock.

Ensure no power is connected to the unit other than as

directed in this manual. Remove power from the unit before

removing or servicing the unit.

There is risk of unit failure, re, electric shock, physical injury or death.

Do not open the inlet grille of the unit during operation. Do

not operate the unit with the panels or guards removed. Do

not insert hands or other objects through the inlet or outlet

with the unit is plugged in. Do not touch the electrostatic

lter, if the unit includes one.

The unit contains sharp, rotating, hot, and high voltage parts that can

cause personal injury and/or electric shock.

Securely attach the electrical cover to the unit.

Non-secured electrical covers can result in burns or electric shock due to

dust or water in the service panel.

CAUTION

To avoid physical injury, use caution when cleaning or

servicing the air conditioner.

Multi F Standard Wall-Mounted Indoor Unit

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Installation Manual

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INTRODUCTION

Multi F and Multi F MAX Standard

Wall-Mounted Units

This manual describes how to install the LG Multi F and Multi F MAX

(Multi Zone) Standard Wall-Mounted Indoor Units (IDU) for Multi

F heat pump systems. Table 1 lists the available models. Refer to

LG’s Multi F Indoor Unit Engineering Manual for complete detailed

engineering data and selection procedures.

Safety

Safety of personnel is the primary concern during all

procedures. Read and understand the safety summa-

ry at the front of this manual. Read and understand

this installation procedure before beginning instal-

lation. Use the appropriate tools and accessories

during installation. Plan your work and do not work

alone, if possible. Know how to obtain emergency

medical and fire fighting assistance.

Installation Personnel

This equipment is intended for installation by personnel trained

in the required construction, mechanical, electrical, and/or other

disciplines.

Applicable Codes

Personnel must be familiar with and follow the applicable national,

state, and/or local codes. In the event of a conflict between any

applicable code and the instructions in this manual, comply with the

applicable code.

• Connecting cable (power and control)

• Pipes - vapor line and liquid line, with

insulation

• 3/8” or 1/2” Threaded hanger rods

• 3/8” or 1/2” nuts, at washers, and

lock/split washers

• Insulated drain hose

• Additional drain hose

• Level

• Screwdriver

• Electrical lineman pliers

• Electric drill

• Hole saw

• Drill

• Flaring tool set

• Tubing cutter

• Tube/pipe reamer

• Torque wrenches

• Allen wrench

• Gas-leak detector

• Thermometer

WARNING

Installation work must be performed by trained personnel and in

accordance with national wiring standards and all local or other

applicable codes. Improper installation can result in re, electric shock,

physical injury, or death.

Note:

Please read all instructions before installing this product. Become familiar

with the unit’s components and connections, and the order of installation.

Incorrect installation can degrade or prevent proper operation.

Figure 1: Typical Multi F Standard Wall-Mounted Indoor Unit

Required Tools (field provided)

Required Parts (field provided)

Multi F Standard Wall-Mounted Indoor Unit

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Typical Unit Model Number

Nominal Capacity

Cooling (Btu) Heating (Btu)

LMN077HVT 7,000 8,100

LSN090HSV4 9,000 10,400

LSN120HSV4 12,000 13,800

LMN157HVT 14,300 16,500

LSN180HSV4 18,000 20,800

LMN247HVT 24,000 27,000

Table 1: Multi F Standard Wall-Mounted Indoor Units

INTRODUCTION

Part Quantity Image

Installation Plate One (1)

Type “A” Screws Five (5)

Type “B” Screws

(M4 x 12L)

Two (2)

Wireless

Controller with Holder

HVT: AKB73635606

HSV: AKB73835312

One (1)

7,000 ~ 15,000 Btu/h Indoor Units

18,000 and 24,000 Btu/h Indoor Units

Table 2: Included Items

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UNIT NOMENCLATURE

Multi F Multi-Zone Systems — Indoor Units

N 157 HVT

Generation

3 = Third (also Third Gen if no number in this position)

4 = Fourth

Features:

H = Heat Pump

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

VN: Vertical-Horizontal Air Handling Indoor Unit

L = LG

077 = 7,000

090 = 9,000

120 = 12,000

157 = 15,000

180 = 18,000

247 = 24,000

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

• All indoor units are compatible with wired controllers

Type: M = Multi-Zone

S = Single Zone (Gen 4 Single Zone units also compatible with Multi Zone)

Multi F Standard Wall-Mounted Indoor Unit

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GENERAL DATA

R410A Refrigerant

R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant and, therefore, all piping system materials

installed must have a higher resisting pressure than the materials traditionally used in R22 systems.

R410A refrigerant is an azeotrope of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is 0.

WARNING

• Do not place refrigerant cylinder in direct sunlight. Refrigerant cylinder may explode causing severe injury or death.

Note

• Because R410A is a combination of R32 and R125, the required additional refrigerant must be charged in its liquid state. If the

refrigerant is charged in its gaseous state, its composition changes and the system will not work properly.

• Do not heat piping more than necessary during installation. Piping may become soft and fail when pressurized.

• Do not use any piping that has not been approved for use in high-pressure refrigerant systems. Piping wall thickness must comply

with the applicable local, state, and federal codes for the 551 psi design pressure of R410A. Inadequate piping may fail when

pressurized.

Indoor units Outdoor units

Model Number

Indoor Unit Nominal

Capacity (Btu/h)

LMU18CHV LMU24CHV LMU30CHV LMU36CHV LMU480HV LMU540HV

Maximum No. of Connectable Indoor Units

2 3 4 4 8 8

LMN077HVT 7,000 O O O O O O

LSN090HSV4 9,000 O O O O O O

LSN120HSV4 12,000 O O O O O O

LMN157HVT 15,000 O O O O O O

LSN180HSV4 18,000 – O O O O O

LMN247HVT 24,000 – O O O O O

Table 3: Allowable Indoor Unit to Outdoor Unit Connections.

Allowable Indoor Unit to Outdoor Unit Connections

In Multi F/Multi Zone systems, the standard wall-mounted IDUs can be connected to the Multi F outdoor units (ODUs) listed in Table 3.

connection allowed: O

connection not allowed: –

Device Connection Limitations

• The minimum number of connected and operating indoor units to Multi F / Multi F MAX systems is two.

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

LMU18CHV = 2 LMU24CHV = 3 LMU30CHV = 4

LMU36CHV = 4 LMU480HV = 8 LMU540HV = 8

• The maximum allowable total indoor unit capacity (Btu/h) for each Multi F / Multi F MAX heat pump system is:

LMU18CHV = 24,000 LMU24CHV = 33,000 LMU30CHV = 40,000

LMU36CHV = 48,000 LMU480HV = 65,000 LMU540HV = 73,000

• Refer to the Multi F Engineering Manual to properly determine total indoor unit connected capacity.

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Table 4: Multi F Multi Zone Standard Wall-Mounted Indoor Unit Specications

GENERAL DATA

Specications

Model Name LMN077HVT LSN090HSV4 LSN120HSV4 LMN157HVT LSN180HSV4 LMN247HVT

Nominal Cooling Capacity

(Btu/h)

7,000 9,000 12,000 14,300 18,000 24,000

Nominal Heating Capacity

(Btu/h)

8,100 10,400 13,800 16,500 20,800 27,000

Operating Range

Cooling (°F WB)

57-77

Heating (°F DB)

59-81

Fan

Type

Cross Flow

Motor Output (W) x Qty.

14.4 x 1 76.0 x 1

Motor/Drive

Brushless Digitally Controlled / Direct

Airflow Rate CFM (H/M/L)

198 / 177 / 162 247 / 230 / 212 335 / 318 / 300 371 / 318 / 247 572 / 501 / 434 720 / 600 / 466

Unit Data

Refrigerant Type

R410A

Refrigerant Control

Electronic Expansion Valve (EEV)

Power Supply V, Ø, Hz

208-230, 1, 60

Rated Amps (A)

0.1 0.2 0.3

Sound Pressure Level ±3 dB(A)

(H/M/L)

33 / 30 / 26 33 / 30 / 27 39 / 36 / 31 43 / 39 / 34 37 / 33 / 28 42 / 39 / 36

Dimensions (W x H x D, in.)

35-1/4 x 11-3/8

x 8-9/32

34-7/8 x 11-1/4

x 8-1/4

34-7/8 x 11-1/4

x 8-1/4

35-1/4 x 11-3/8

x 8-9/32

40-9/16 x 12-13/16

x 9-13/16

40-9/16 x 12-25/32

x 9-27/32

Net Unit Weight (lbs.)

23 20 20 23 31 32

Shipping Weight (lbs.)

26 36 37

Power Wiring / Communications

Cable (No. x AWG)

4 x 18

Heat Exchanger (Row x Column

x Fin / inch) x Number

(2 x 16 x 23) x 1 (3 x 18 x 22) x 1

Pipe Size

Liquid (in.)

1/4

Vapor (in.)

3/8 1/2

Connection Size

Liquid (in.)

1/4 3/8 1/4

Vapor (in.)

3/8 5/8 1/2

Drain O.D. / I.D. (in.)

27/32, 5/8

Nominal capacity is rated 0 ft. above sea level with corresponding refrigerant piping

length in accordance with standard length of each outdoor unit and a 0 ft. level difference

between outdoor and indoor units. All capacities are net with a combination ratio between

95 – 105%.

Nominal cooling capacity rating 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).

Nominal heating capacity rating 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).

This unit comes with a dry helium charge.

Acceptable operating voltage: 187V-253V.

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.

All power wiring / communications cable to be minimum 18 AWG, 4-conductor, stranded,

shielded, and must comply with applicable local and national codes.

Multi F Standard Wall-Mounted Indoor Unit

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GENERAL DATA

Gas pipe connection port

(flare connection)

Liquid pipe connection port

(flare connection)

Cooling

Heating

Thermistor for

Evaporator Inlet Temperature

Thermistor for

Indoor Air Temperature

Thermistor for Evaporator

Outlet Temperature

Heat Exchanger

Cross Flow Fan

Model No. Vapor (inch) Liquid (inch)

LMN077HVT

Ø3/8 Ø1/4

LSN090HSV4

LSN120HSV4

LMN157HVT

LSN180HSV4 Ø5/8 Ø3/8

LMN247HVT Ø1/2 Ø1/4

Table 5: Multi F Multi Zone Standard Wall-Mounted Indoor Unit Refrigerant Pipe Connection Port Diameters

Installation Manual

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GENERAL DATA

Typical Multi F/Multi F Max Systems

Max. 49.2 feet

Max. 24.6 feet

Typical Multi F System

Example: LMU36CHV outdoor unit with four (4)

indoor units connected.

ODU: Outdoor Unit.

IDU: Indoor Unit.

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

Major System Components

A typical Multi F system consists of an outdoor unit (ODU), refrigerant piping, and two to four indoor units (IDUs). The standard

wall-mounted units described in this manual are one of the types of IDUs that can be connected to a Multi F system.

A typical Multi F Max system consists of an ODU, refrigerant piping, one or two branch distribution units (BDU), and two to eight

IDUs. The standard wall-mounted units described in this manual are one of the types of IDUs that can be connected to a Multi F

Max system.

Example: LMU540HV outdoor unit with four

(4) indoor units, and one (1) branch distribu-

tion unit connected.

ODU: Outdoor Unit.

IDU: Indoor Unit.

BDU: Branch Distribution Unit.

A: Main Piping.

B: Branch Piping (Branch Distribution Unit to

Indoor Unit[s]).

h2 ≤ 49.2 feet

h3 ≤ 32.8 feet

h1 ≤ 98.4 feet

BDU

ODU

IDU

Typical Multi F MAX System with One Branch Distribution Unit

Outdoor

Unit

Minimum Length for Each

Pipe Segment (ft.)

Maximum Equivalent Pipe Length

to Each Indoor Unit (ft.)

Maximum Equivalent Pipe Length

for Each System (ft.)

A B C D

LMU18CHV 10 82 82 - - 164

LMU24CHV 10 82 82 82 - 246.1

LMU36CHV 10 82 82 82 82 246.1

Table 6: Multi F Outdoor Unit Refrigerant Piping System Limitations.

Multi F Standard Wall-Mounted Indoor Unit

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GENERAL DATA

Typical Multi F/Multi F Max Systems

Example: LMU540HV outdoor unit with seven

(7) indoor units, and two (2) branch distribu-

tion units connected.

ODU: Outdoor Unit.

IDU: Indoor Unit.

BD: Branch Distribution Unit(s).

ΣA: Main Piping.

ΣB: Branch Piping (Branch Distribution Unit[s]

to Indoor Unit[s]).

h2 ≤ 49.2 feet

h3 ≤ 32.8 feet

h4 ≤ 49.2 feet

h1 ≤ 98.4 feet

BDU Y-Branch

BDU

IDU

ODU

IDU

Typical Multi F MAX System with Two Branch Distribution Units

Table 7: Multi F MAX Outdoor Unit Refrigerant Piping System Limitations.

Pipe Length

(ELF = Equivalent

Length of pipe

in Feet)

Total piping length (ΣA + ΣB)

≤475.7 feet

Main pipe

(Outdoor Unit to Branch

Distribution Units: ΣA)

Minimum

10 feet

Maximum

≤180.4 feet

Total branch piping length (ΣB)

≤295.3 feet

Branch pipe

(Branch Distribution Units

to Indoor Units: B)

Minimum

10 feet

Maximum

≤49.2 feet

Elevation Differential

(All Elevation

Limitations are

Measured in

Actual Feet)

If outdoor unit is above or below indoor unit (h1)

≤98.4 feet

Between the farthest two indoor units (h2)

≤42.9 feet

Between branch distribution unit and farthest

connected indoor unit(s) (h3)

≤32.8 feet

Between branch distribution units (h4)

≤42.9 feet

Table 8: Multi F MAX Piping Sizes.

Piping

Main Pipe A

(inch)

Branch Pipe B

Liquid Ø3/8

Depends on the size

of the indoor unit piping

Gas Ø3/4

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Table 9: Equivalent Piping Length for Elbows,

Y-branches, and Branch Distribution Units.

Kit contains two Y-branches: one for liquid and one for vapor.

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 systems only)

1.6

Branch Distribution Unit (ft.)

(Multi F MAX systems only)

8.2

Field-supplied elbows are allowed if they are long radius and designed for use with R410A refrigerant. Be

sure to account for the additional pressure losses in equivalent pipe length calculations for each elbow,

y-branch, and branch distribution unit. The equivalent pipe length of each elbow, Y-branch, and/or branch

distribution unit must be added to each pipe segment to ensure maximum lengths are not exceeded.

Using Refrigerant Components

Field Supplied Refrigerant Piping

Type ACR copper is the only approved refrigerant pipe material for use with LG Multi F air conditioning

products. ACR rated tubing is the only type that ships with yellow caps. Approved tubing for use with

Multi V products will be marked “R410 RATED” along the length of the tube. Tube wall thickness should

meet local code requirements and be approved for a maximum operating pressure of 551 psi.

Refer to the refrigerant piping section (starting on page 22) of the General Installation Guidelines for

more information on piping.

GENERAL DATA

Refrigerant Piping Requirements

Multi F Standard Wall-Mounted Indoor Unit

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DANGER

To avoid the possibility of re, do not install the unit in an area where combustible gas may generate, ow, stagnate, or leak. Failure to do so will

cause serious bodily injury or death. Before beginning installation, read the safety summary at the beginning of this manual.

Select a location for installing the wall-mounted indoor unit (IDU) that meets the following conditions:

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

• Where air circulation will not be blocked

• Where noise prevention is taken into consideration

• Ensure there is sufcient space from the ceiling and oor

• Locate the indoor unit in a location where it can be easily connected to the outdoor unit/branch distribution unit

• Include space for drainage to ensure condensate ows properly out of the unit when it is in cooling mode

• Use a level indicator to ensure the unit is installed on a level plane

Note:

The unit may be damaged, may malfunction, and/or will not operate as designed if installed in any of the following conditions:

Do not install the unit where it will be subjected to direct thermal radiation from other heat sources.

Do not install the unit in an area where combustible gas may generate, flow, stagnate, or leak.

Do not install the unit in a location where acidic solution and spray (sulfur) are often used.

Do not use the unit in environments where oil, steam, or sulfuric gas are present.

Do not install additional ventilation products on the chassis of the unit.

Do not install the unit near high-frequency generator sources.

Do not install the unit near a doorway.

Installing in an Area Exposed to Unconditioned Air

In some installation applications, areas (floors, walls) in some rooms may be exposed to unconditioned air (room may be above or next to an

unheated garage or storeroom). To countermeasure:

• Verify that carpet is or will be installed (carpet may increase the temperature by three degrees).

• Add insulation between the oor joists.

• Install radiant heat or another type of heating system to the oor.

Required Clearances

Figure 6 shows required clearance distances around a typical installed wall-mounted unit.

GENERAL INSTALLATION GUIDELINES

>4 inches

Recommended height

>6-1/2 feet from floor

>4 inches

HVT; 9/12k HSV4 Units: ≥5 inches

LSN180HSV4 Units: ≥8 inches

Location Selection

Figure 2: Required Clearances Around Typical Installed Unit

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GENERAL INSTALLATION GUIDELINES

Unpack and Inspect for Freight Damage

CAUTION

Shipping and net weights of the wall-mounted units are listed in Table 4. To help avoid injury to personnel and

damage to the unit, use two people when carrying a unit by hand.

Note:

Do not unpack the unit and remove the protective materials until ready to install. Before unpacking,

carefully move the packaged unit to a work area near the installation location.

After opening, if the unit is damaged, repack the unit as it was shipped to you. RETAIN ALL PACKING

MATERIALS. In general, freight damage claims will be denied if the original packing materials are not

retained for the claims adjustor to inspect. Contact your supervisor on how to proceed with filing a freight

claim and to order a replacement unit.

Note:

Before opening the shipping container, check the container labeling to verify the unit received is the correct

unit. Verify the unit capacity, type, and voltage. Refer to the chart on “Dimensions of the Flare” on page 29.

1. Before opening the shipping container, verify you have the correct unit as described in the Note

above.

2. Place the box on a solid surface right side up.

3. Cut the white reinforced nylon straps.

4. Open the top of the box and fold back all four flaps.

5. Remove the protective cardboard/Styrofoam® top sheet and place to the side.

6. The walls and top panels are not attached to the bottom of the box. Lift the cardboard carton by the

flaps and remove the box walls and top and place it to the side.

7. Remove the moisture barrier plastic bonnet.

8. Check the unit nameplate data and model number. Verify the unit voltage, and capacities are correct

before proceeding.

9. Locate and retain the piping/condensate accessory kit located in the bottom of the box under the

refrigerant pipe stubs.

10. Using two people, carefully lift the unit and inspect for freight damage. DO NOT lift by the refrigerant

piping or drain pipe stub. Lift by the hangar brackets or chassis frame only. If damage is found, repack

the unit as it was received in the original container.

11. If the unit is undamaged, remove and retain the installation manual. It is located under or on top of

the unit.

Inspection

Multi F Standard Wall-Mounted Indoor Unit

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GENERAL INSTALLATION GUIDELINES

WARNING

• Mounting hardware must be securely installed to prevent the chas-

sis falling from its installation location. There is risk of personnel

injury or property damage from falling equipment.

• When choosing a location for the wall mount plate, be sure to take

into consideration routing of wiring for power outlets within the wall.

Touching wiring can cause serious bodily injury, or death.

• Installation work must be performed by trained personnel and in

accordance with all local or other applicable codes. There is risk of

injury to personnel from incorrect installation.

Note:

• Ensure the unit is properly installed. Incorrectly installed units can

result in degraded performance or an inoperative unit/system.

• Use a level indicator to ensure the installation plate and chassis

are installed on a level plane.

• If the unit is installed near a body of water, certain components

are at risk of being corroded. Appropriate anti-corrosion methods

should be taken for the unit and all components.

Install Wall-Mounted IDU Chassis

Mounting the Installation Plate

The mounting wall should be strong and solid enough to protect the

unit from vibration. It should securely hold the installation plate and

the weight of the chassis.

1. Determine the installation location.

2. Refer to Figure 3 or Figure 4 for the appropriate mounting

diagram.

3. Mount the installation plate on the wall using the Type “A” screws.

If mounting the unit on concrete, consider using anchor bolts.

Use a level to ensure the plate is level.

4. Always mount the installation plate horizontally. Measure the wall

and mark the centerline using thread and a level.

Figure 3: Installation Plate for LMN077HVT, LSN090HSV4,

LSN120HSV4, and LMN157HVT Units.

Installation Plate

Frame

Hooks

Type "A" Screws

Figure 4: Installation Plate for LSN180HSV4 and LMN247HVT Units.

Figure 5: Installation Plate Attaching Screw Placement.

Ø2-3/4 inches

2-23/32 inches

2-7/32 inches

Right rear

piping

Left rear

piping

Installation Plate

Measuring Tape

Measuring Tape Hanger

Place a level on raised tab

Unit Outline

8-5/32 inches

4-1/8 inches

18-1/8 inches 22-7/16 inches

Ø2-9/16

5-3/16 3-11/16

Right rear piping

Left rear piping

Place a level on raised tab

Unit Outline

8-1/2

6-7/8

17-3/8 17-3/8

Ø2-9/16

A-Type

B-Type

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GENERAL INSTALLATION GUIDELINES

Install Wall-Mounted IDU Chassis

Drilling Piping Hole in the Wall

Use caution when drilling holes through walls. Drilling into power wiring in the wall can

cause serious bodily injury or death.

Follow the left or right piping clearance recommendations in Figure 3 or Figure 4.

1. Using a 2-5/8 (ø 65mm) inch hole core drill bit, drill a hole at either the right or

left side of the wall mounting (Figure 6). The hole should slant 3/16” to 5/16” from

level (upward on the indoor unit side and downward on the outdoor unit side).

2. Finish off the newly drilled hole as shown with bushing and sleeve covering.

Sleeve and bushing prevents damage to the tubing/bundling of the piping.

(3/16"~5/16")

Indoor

WALL

Outdoor

Bushing

Core Drill

Sleeve

Figure 6: Drilling Piping Hole

Hanging the Indoor Unit Chassis

1. Attach the three (3) hooks on the top of the indoor unit to the top edge of

the installation plate. Verify the hooks are properly attached to the instal-

lation plate by gently shaking the indoor unit from side to side.

2. Unlock the tubing clamp from the indoor unit frame. For easier access be-

tween the bottom of the indoor unit and the wall, prop the clamp between

the indoor unit frame and installation plate.

3. Remove the screw covers at the bottom of the indoor unit, unscrew the

two (2) screws, remove the frame cover, remove the piping connection

cover, and position the piping for installation (down, back, left, or right).

Installation plate

Figure 7: Locking the Indoor Unit onto the Installation Plate.

Tubing Clamp

Figure 8: Accessing the Back of the Indoor Unit.

Right

Tubing Clamp

Down

Left

Back

Frame Cover

Figure 9: Removing the Frame Cover.

Figure 10: Exterior Back View of Indoor Unit. Figure 11: Piping Installed to the Left.

Figure 12: Piping Installed to the Right.

Connecting

pipe

Tape

Drain hose

Connecting

pipe

Tape

Drain hose

Multi F Standard Wall-Mounted Indoor Unit

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Preparing for Piping Installation to the Indoor Unit

Note:

Do not bend the piping / drain hose from side to side, it may damage the components.

Prepare the refrigerant piping and drain hose (indoor unit piping) for installation through the wall. Press on the top of the tubing clamp

and slowly guide the piping/hose down (depending on installation requirements, then to the left or right). Relock the tubing clamp after

the piping/hose are released.

GENERAL INSTALLATION GUIDELINES

Refrigerant Piping

Field-Provided Isolation Ball Valves

LG recommends installing field-supplied ball valves with Schrader ports at each indoor unit. Full-port isolation ball valves with Schrader

ports (positioned between valve and indoor unit) rated for use with R410A refrigerant should be used on both the liquid and vapor lines.

For Multi F MAX systems, position valves with a minimum distance of three (3) to six (6) inches of pipe on either side of the valve, and

between six (6) and twelve (12) inches from the first upstream Y-branch or branch distribution unit. If ball valves are installed away from

the first Y-branch and/or branch distribution unit and closer to the indoor unit, oil may accumulate where it cannot be returned to the

outdoor unit and may cause a shortage of oil in the compressor.

Valves should be easily accessible for service. If necessary, install drywall access doors or removable ceiling panels, and position the

valves to face the access door or ceiling panel opening. Mount valves with adequate space between them to allow for placement of

adequate pipe insulation around the valves.

Figure 13: Installing Piping Above and Below an Obstacle.

Above an obstacle.

Minimum

Below an obstacle.

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 avail-

able to route the insulated pipe over the obstacle, then route

the pipe under the obstacle. In either case, it is imperative the

horizontal section of pipe above or below the obstacle be a

minimum of three (3) times greater than the longest vertical rise

(or fall) distance.

Pipe Slope

The horizontal pipe slope cannot exceed 10° up or down.

In-line Refrigeration Components

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

mitted on the refrigerant piping system between the outdoor units and the indoor / branch distribution units.

Multi F/Multi F Max systems have redundant systems that ensure oil is properly returned to the compressor. Sight-glasses and solenoid

valves may cause vapor to form in the liquid stream.

Note:

Over time, dryers may deteriorate and introduce debris into the system. The designer and installer should verify the refrigerant piping system is

free of traps, sagging pipes, sight glasses, lter dryers, etc.

No Pipe Size Substitutions

Use only the pipe size selected by the LATS Multi F pipe system design software or as conveyed in the product installation instructions.

Using a different size is prohibited and may result in a system malfunction or failure to work at all.

Installation Manual

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Refrigerant Piping

GENERAL INSTALLATION GUIDELINES

The LG supplied Y-Branch Kit PMBL5620 MUST be used when two branch distribution units are connected to one Multi F MAX system.

Field-supplied fittings are not permitted. Each Y-Branch kit comes with two (2) Y-branches (one for the liquid line and one for the vapor line)

and insulation covers.

Y-branches may be installed in horizontal or vertical configurations. When installed vertically, position the Y-branch so the straight-through

leg is ±3° of plumb. When installed horizontally, position the Y-branch so the take-off leg is level and shares the same horizontal plane as the

straight-through leg ±5° rotation.

Y-branches should 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 minimum of 20 inches between a Y-branch and the branch distribution unit.

Figure 14: Y-Branch Port Identication and Dimensions.

Figure 15: Y-branch Horizontal Installation Alignment.

Multi F MAX Y-Branch Kit PMBL5620

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.

Figure 16: Y-branch Vertical Installation Alignment.

Viewed from A in direction of arrow

Horizontal

plane

Within ±5

Vertical Up Configuration

Within ± 3°Within ± 3°

Vertical Down Configuration

Material

Polyolefin Foam

UL94 Flame Classication

HF-1

Density

1.84 lbs./ft.

Thermal Conductivity

.0208 Btu/h/ft. ºR

Thickness

1/2 inch

Liquid and Gas

Pipe Joints

Y-Branch Kit Insulation

Insulation for

Field-Installed Piping

Field-Supplied Insulation Tape

Table 10: Insulation Jacket Properties.

Figure 17: Y-Branch Insulation Jacket Diagram.

Model

Y-Branch

Type

Port Identier (inch)

1 2 3

PMBL5620

Liquid Ø3/8 Ø3/8 Ø3/8

Vapor Ø3/4 Ø3/4 Ø3/4

Y-Branch

Type

Dimensions (inch)

X Y

Liquid 13.80 3.24

Vapor 12.48 3.02

Table 11: Multi F MAX Y-Branch Connection Diameters.

A = To Outdoor Unit

B = To Branch Distribution Unit

Multi F Standard Wall-Mounted Indoor Unit

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GENERAL INSTALLATION GUIDELINES

Refrigerant Piping

Table 13: Piping Tube Thicknesses

Nominal Pipe

Outside

Diameter (in)

Actual Outside

Diameter (in)

Drawn Temper Annealed Temper

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 .00020

3/8 0.375 0.030 0.126 .00054 0.032 0.134 .00053

1/2 0.500 0.035 0.198 .00101 0.032 0.182 .00103

5/8 0.625 0.040 0.285 .00162 0.035 0.251 .00168

3/4 0.750 0.042 0.362 .00242 0.042 0.362 .00242

7/8 0.875 0.045 0.455 .00336 0.045 0.455 .00336

1-1/8 1.125 0.050 0.655 .00573 0.050 0.655 .00573

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

Design pressure = 551 psig.

ACR Tubing is available as hard drawn or annealed (soft) and are suitable for use with R410A refrigerant.

The Copper Tube Handbook, 2010, Copper Development Association Inc., 260 Madison Avenue, New York, NY 10016.

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

• Prevent dust, water or other contaminants from entering the piping during installation. Contaminants can cause mechanical failure.

Selecting Field-Supplied Copper Tubing

Copper is the only approved refrigerant pipe material for use with Duct Free System Single Zone products, and LG recommends seamless

phosphorous deoxidized ACR type copper pipe, hard-drawn rigid type “K” or “L”, or annealed-tempered, copper pipe.

• Drawn temper (rigid) ACR copper tubing is available in sizes 3/8 through 2-1/8 inches (ASTM B 280, clean, dry, and capped).

• Annealed temper (soft) ACR copper tubing is available in sizes 1/4 through 2-1/8 inches (ASTM B 280, clean, dry, and capped).

Tube wall thickness should meet local code requirements and be approved for an operating pressure of 551 psi. If local code does not

specify wall thickness, LG suggests using tube thickness per table below. When bending tubing, try to keep the number of bends to a minimum, and

use the largest radii possible to reduce the equivalent length of installed pipe; also, bending radii greater than ten (10) pipe diameters can minimize

pressure drop. Be sure no traps or sags are present when rolling out soft copper tubing coils.

Table 14: ACR Copper Tubing Dimensions and Physical Characteristics

1-4

Type Seamless Phosphorous Deoxidized

Class UNS C12200 DHP

Straight Lengths H58 Temper

Coils O60 Temper

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 Type “K” or “L” and Soft ACR Acceptable Rigid Type “K” or “L” Only

Min. Bend

Radius (in)

.563 .9375 1.5 2.25 3.0 3.0 3.5 4.0 4.5

Min. Wall

Thickness (in)

.03 .03 .035 .040 .042 .045 .050 .050 .050

Table 12: ACR Copper Tubing Material

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Refrigerant Piping

GENERAL INSTALLATION GUIDELINES

No Pipe Size Substitutions

Note:

Use only the pipe size recommended by this installation manual. Using a different size is prohibited and may result in system malfunction or failure.

Under normal operating conditions, the vapor pipe temperature of a

Duct Free System can vary as much as 280°F. With this large vari-

ance 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. 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 should be.

Linear pipe expansion can be calculated using the following formula:

1. In Table 15 find the row corresponding with the actual length of

the straight pipe segment.

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

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.

Example:

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

straight segment of tubing between an indoor unit and the outdoor

unit. In heating, this pipe transports hot gas vapor to the indoor units

at 120°F. In cooling, the same tube is a suction line returning refrig-

erant vapor to the outdoor unit at 40°F. Look up the copper tubing

expansion at each temperature and calculate the difference.

Vapor Line

Transporting Hot Vapor: 100 ft. pipe at 120 °F = 1.40 in.

Transporting Suction Vapor: 100 ft. pipe at 40 °F = 0.40 in.

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. No significant change in length of

the liquid line, therefore, is anticipated.

When creating an expansion joint, the joint height should 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 Table 1010. 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.)

C = Constant (For copper = 9.2 x 10

-6

in./in.°F)

L = Length of pipe (ft.)

= Refrigerant pipe temperature (°F)

= Ambient air temperature (°F)

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

Copper Expansion and Contraction

Multi F Standard Wall-Mounted Indoor Unit

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See table below for precalculated anticipated expansion for various pipe sizes and lengths of refrigerant tubing.

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

Table 15: Linear Thermal Expansion of Copper Tubing in Inches

Pipe length baseline temperature = 0°F. "Expansion of Carbon, Copper and Stainless Steel Pipe," The Engineers' Toolbox, www.engineeringtoolbox.com.

Figure 18: Coiled Expansion Loops and Offsets

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

Anticipated Linear

Expansion (LE) (inches)

Nominal Tube Size (OD) inches

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

1/2

6 7 8 9

38 44 50 59

9 10 11 13

54 63 70 83

1-1/2

11 12 14 16

66 77 86 101

12 14 16 19

77 89 99 117

2-1/2

14 16 18 21

86 99 111 131

15 17 19 23

94 109 122 143

3-1/2

16 19 21 25

102 117 131 155

17 20 22 26

109 126 140 166

Table 16: Radii of Coiled Expansion Loops and Developed Lengths of Expansion Offsets

GENERAL INSTALLATION GUIDELINES

Refrigerant Piping

Installation Manual

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

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Pipe Supports

Figure 19: Installing an Insert Into

a Concrete Beam.

GENERAL INSTALLATION GUIDELINES

Refrigerant Piping

Inserts and Pipe Supports

Inserts

An insert can be installed into a floor or beam before the concrete sets so that fittings such as ducts,

pipes, or suspension bolts can be added at a later time. Decide where the inserts should be placed

before support installation.

Concrete Beam

Insert

Suspension Bolt

Anti-vibration Material

Nail

Figure 20: Pipe Hanger Details.

A + B ~ 12" – 19"

Max. 12" Max. 12"

Max. 12"

Figure 21: Typical Pipe Support Location—Change

in Pipe Direction.

Max. 12"

~ 12" – 19"

Pipe supports should never touch the pipe wall; supports should be installed outside

(around) the primary pipe insulation jacket. Insulate the pipe before installing the sup-

ports. Pipe supports are field-provided and must meet local code. If local codes do not

specify pipe support spacing, install pipe supports a maximum of 5 feet on center for

straight segments of pipe up to 3/4” outside diameter size.

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

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

port piping at indoor units as shown. Support Y-Branch fittings as shown.

Note:

The pipe system must be adequately supported to avoid pipe sagging. Sagging pipes become oil traps that

lead to equipment malfunction.

Figure 22: Pipe Support at Indoor Unit.

Figure 23: Pipe Support at Y-branch Fitting.

Multi F Standard Wall-Mounted Indoor Unit

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

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Examples of Supports

Bolt

1.5t

Plate

Insulation

Bolt

PVC

Figure 24: U-Bolt Support with Insulation. Figure 25: O-Ring Support with Insulation.

To prevent

insulation from

pressing and

lagging, use a cover.

Sheathing

O-Ring

Band

Lags

Note:

Do not compress the insulation with the saddle-type support. If the insulation is compressed, it may 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 26: Saddle-Type Support.

Figure 27: U-Bolt Support with an Insulated Pipe. Figure 28: O-Ring Band Support with an Insulated Pipe.

Figure 29: One-Point Down-Stop Support (>441 lbs.).

Figure 30: Two-Point Down-Stop Support.

Refrigerant Piping

GENERAL INSTALLATION GUIDELINES

Installation Manual

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MUL

40 in40 in

Inside wall (concealed)

Floor (fire-resistance)

Area between fire-resistant

insulation and boundary wall

Roof pipe shaft

Outside wall

Outside wall (exposed)

Sleeve

Insulation

Lagging

Caulk

Band

Water-resistant layer

Sleeve with edge

Lagging

Mortar or other fire-resistant caulk

Fire-resistant insulation

When filling an access hole with mortar, cover the

area with steel plate so that the insulation will not

fall through. For this area, use fire-resistant

materials for both the insulation and cover. (Vinyl

cover should not be used.)

Pipe Sleeves at Penetrations

LG requires that all pipe penetrations through walls, floors, and

pipes buried underground be routed through a properly insulated

sleeve that is sufficiently sized to provide free movement of the pipe

and does not compress the insulation. Route underground refriger-

ant pipe inside a protective sleeve to prevent insulation deteriora-

tion. Follow federal, state, and local regulations and codes when

choosing a sleeve type.

Figure 31: Pipe Sleeve Options.

For example:

Diameter of Gas Piping: 1/2"

Diameter of Liquid Piping: 1/4"

Thickness of Gas Piping Insulation: 0.4" x 2

Thickness of Liquid Piping Insulation: 0.4" x 2

Surplus: 0.8"

Sleeve diameter (total): 3.1" minimum

Note:

Pipe diameter plus insulation thickness determines wall

penetration diameter.

Underground Refrigerant Piping

Route refrigerant pipe installed underground inside a vapor tight pro-

tective sleeve to prevent insulation deterioration and water infiltra-

tion. Refrigerant 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 32: Typical Arrangement of Refrigerant Pipe

and Cable(s) in a Utility Conduit.

Table 17: 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 may vary based on surrounding ambient conditions and should be calculated

and specified by the design engineer.

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

Insulation thickness (value in parenthesis) = 1 inch.

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

Figure 33: Underground Refrigerant Piping.

Liquid

Pipe

Vapor Pipe

3/8 (1-1/8

2,3

) 1/2 (2.0

2,5

) 5/8 (2-1/8

2,5

) 3/4 (2-1/4

2,5

)

1/4 (1.0)

4 4 4 4

3/8 (1-1/8)

4 4 4 5

Vapor Line

Liquid Line

Min. 18 Gauge

Cable

Power/Communication

e Sleeve

Insulation Material

Insulation

Material

GENERAL INSTALLATION GUIDELINES

Refrigerant Piping

Multi F Standard Wall-Mounted Indoor Unit

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

MUL

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 contami-

nate the interior with dust, moisture, etc. See Table 18 for care of piping.

Dry Clean Airtight

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

Problems

Caused

- 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 minimum of 500

microns and ensure the vacuum holds at

that level for 24 hours

- 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.

Moisture

Dust

Leaks

Figure 34: Keep Piping Capped While Storing

Table 18: Three Principles of Refrigerant Piping

Piping Materials and Handling

GENERAL INSTALLATION GUIDELINES

Piping Materials and Handling

Installation Manual

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

MUL

• Do not allow the refrigerant to leak during brazing; if refrigerant combusts, it generates a toxic gas which can cause physical injury or death.

• Do not braze in an enclosed location, and always test for gas leaks before/after brazing. Gas leaks can cause physical injury or death.

• After brazing, check for refrigerant gas leaks. Refrigerant gas leaks can cause physical injury or death.

• When selecting flare fittings, always use a 45° fitting rated for use with high pressure refrigerant R410A. Failure to do so may result in

refrigerant leaks which in turn could result in personal injuries or death from oxygen depletion. Selected fittings must also comply with local,

state, or federal standards.

Creating a Flare Fitting

Note:

One of the main causes of refrigerant leaks is defective ared connections. Be sure to properly form the are connections.

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.

• Cut the cable 4.9 ft longer than the pipe length.

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.

3. Flaring the pipe end.

• Use the proper size aring tool to nish ared connections

as shown.

• Refer to the diagram in step 3 of Figure 35 and the dimen-

sions in Table 19 for positioning the pipe in the aring tool.

• ALWAYS create a 45° are when working with R410A. See

Warning on this page.

4. Carefully inspect the flared pipe end.

• Compare the are with the illustration in step 4 of Figure 35.

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

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

Pipe Outside

Diameter (inch)

“A” Measurement

(inch)

1/4 0.04 – 0.5

3/8 0.06 – 0.7

1/2 0.06 – 0.7

5/8 0.06 – 0.7

3/4 0.07 – 0.8

Table 19: Flare “A” Measurement

Piping Preparation

Note:

1. If piping becomes kinked due to excessive bending, do not use the pipe.

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

Figure 35: Creating a Flare Fitting

Copper

tube

90°

Slanted Uneven Rough

Pipe

Reamer

Point

down

Flare nut

Copper

tube

Bar

Copper pipe

Clamp handle

Red arrow

Cone

Yoke

Handle

Bar

"A"

Slanted

Inside is shiny with no scratches

Smooth

Even length

Damaged

surface

Cracked Uneven

thickness

Incorrect Flares

2A. 2B.

PIPING CONNECTIONS

Piping Preparation

Multi F Standard Wall-Mounted Indoor Unit

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

MUL

Table 20: Outdoor Unit Piping Connections.

Figure 36: Multi F Refrigerant Pipe Connections

(LMU36CHV shown as example).

Avoid Pipe Damage

• When routing eld-provided piping, avoid damaging the outdoor unit from excessive vibration.

• Correctly route the piping so it does not make contact with mounting bolts. Allow room for eld installation.

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

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

Main gas

valve

Main liquid

valve

Gas Piping Connections

Liquid

Piping

Connection

A-UNIT

B-UNIT

C-UNIT

D-UNIT

Connection sockets (included as a factory-supplied accessory with the indoor

units) may need to be used when piping the indoor units to the outdoor unit.

Indoor Unit

Capacity

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

A B A B

18,000 Btu/h Ø3/8 → Ø1/2, Ø1/2 → Ø5/8 Ø1/4 → Ø3/8

24,000 Btu/h Ø3/8 → Ø1/2 N/A

Flare

Indoor

Unit

Flare

Outdoor

Unit

Indoor Unit Capac-

ity

Vapor Line Size

(in., OD)

Liquid Line Size

(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

Ø1/2

24,000 Btu/h

1. Align the center of the piping sections and tighten the flare nut by

hand.

2. Tighten the flare nut with a torque wrench, using the arrows on

the wrench as a guide, until a click is heard.

Multi F Outdoor Unit to Indoor Unit Piping Connections

Outdoor Unit Piping Connections LMU18CHV LMU24CHV LMU36CHV

Liquid Line Connection (in., OD) x Qty. 1/4 x 2 1/4 x 3 1/4 x 4

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

Table 21: Indoor Unit Pipe Sizes.

Table 22: Indoor Unit Piping Connections.

Figure 37: Connection Socket Diagram.

Using the Connection Socket

Connection Socket

(Factory-supplied with

the indoor unit)

Figure 38: Performing Connections.

Indoor Unit Capac-

ity

Vapor Line Connection

(in., OD)

Liquid Line Connection

(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 Ø5/8 Ø3/8

24,000 Btu/h Ø1/2 Ø1/4

Table 23: Connection Socket Dimensions.

IDU to ODU

PIPING CONNECTIONS

Installation Manual

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

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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 ODU

Flare side to indoor unit

Ø3/8 in.

Flare side to indoor unit or

pipe to indoor unit

Ø1/2 in.

Connection socket

Flare nut

Piping

Ø3/8 in.

Spanner

Field Piping

Flare nut

Torque

wrench

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 ODU

Flare side to indoor unit

Flare

side pipe

from branch distribution unit or ODU

Flare

side to

branch distribution unit or ODU

Multi F System Piping Connections

Figure 39: Possible Outdoor Unit or Branch Distribution Unit to Indoor Unit Connections.

1. When connecting the flare nuts, coat the flare (inside and outside) with polyvinyl ether (PVE)

refrigeration oil only.

2. Align the center of the piping sections and tighten the flare nut by hand.

3. Tighten the flare nut with a torque wrench and a backup wrench until a click is heard.

4. Wrap insulation around the connection.

5. If it is necessary to loosen the flare nuts, always use two wrenches to do so.

PIPING CONNECTIONS

IDU to ODU

Union

Figure 40: Tightening the Flare Nuts.

Pipe size (Inches O.D.) Tightening torque (ft-lbs) Width of the are (A [inches])

1/4Ø 13.9 - 18 1/8

3/8Ø 24.5 - 30.3 1/8

1/2Ø 39.7 - 47.7 1/8

5/8Ø 45.5 - 59.2 1/16

Table 24: Tightening Torque for Flare Nuts.

Note:

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

system and create oil sludge leading to equipment damage and system malfunction.

Multi F Standard Wall-Mounted Indoor Unit

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

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Figure 41: Using Nitrogen Gas During Brazing

Refrigerant Safety

ASHRAE Standards 15-2010 and 34-2010 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 refrigerant, the maximum allowable concentration of refrigerant is twenty-six (26) lbs. per 1,000 cubic feet of 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 may occur in the smallest room volume on the

system, and compare the results to the maximum allowable concentration number.

Also consult state and local codes in regards to refriger-

ant safety.

WARNING

Verify the maximum refrigerant concentration level in the space where the indoor unit will be mounted meets the concentration limit for the application.

Information about ASHRAE Standard 15-2010/34-2010 and addenda current as of the date of this publication.

Auxiliary

Valve

Tape

(no air bubbles)

Do not block outlet side.

When pressure inside pipe

is above atmospheric pressure,

pinhole leaks can occur

Refrigerant Pipe

Welding Point

Regulator

Nitrogen gas

3.0 psi or less

Nitrogen

Gas

Tank

Brazing

Note:

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

1. All joints are brazed in the field. Multi V IV 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 depends on the

installer using best practices and utmost care while assembling the piping system.

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

• Purge all pipe sections clean with dry nitrogen prior to assembly.

2. Proper system operation depends on the installer using best practices and the utmost care while assembling the piping system.

• Use adapters to assemble different sizes of pipe.

• Always use a non-oxidizing material for brazing. Do not use ux, soft solder, or anti-oxidant agents. If the proper material is not used,

oxidized lm may accumulate and clog or damage the compressors. Flux can harm the copper piping or refrigerant oil.

• Use a tubing cutter; do not use a saw to cut pipe. De-bur and clean all cuts before assembly.

3. Brazing joints:

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

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

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

heat barrier spray.

IDU to ODU

PIPING CONNECTIONS

Installation Manual

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

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Note:

Follow locals codes when selecting EPDM insulation wall thickness. Thickness in Table 25 is based on heat conductivity of 0.61 Btu/in/h/ft2/°F.

Table 25: Insulation Guidelines for Typical and Special Circumstances.

Classication

Air-conditioned location Non-air conditioned location

1. Typical location 2. Special location 3. Typical location 4. Special location

Liquid pipe

ø1/4 inches

1/2 inches 1/2 inches 1/2 inches 1/2 inches

ø3/8 inches

≥ø1/2 inches 1/2 inches 1/2 inches 1/2 inches 1/2 inches

Vapor pipe

ø3/8 inches

1/2 inches 3/4 inches 3/4 inches 1 inch

ø1/2 inches

ø5/8 inches

ø3/4 inches

1. Air-conditioned, Typical location

• When piping passes through an indoor area where the indoor unit operates, such as an apartment, classroom, ofce, mall, hospital, etc.

2. Air-conditioned, Special location

• When the location is air conditioned, but has severe temp/humidity difference due to high ceilings, such as a church, auditorium, theater, etc.

• When the location is air conditioned, but internal temperature/humidity are high, such as a bathroom, swimming pool, locker room, etc.

3. Non-air conditioned, Typical location

• When piping passes through an indoor area where the indoor unit does not operate, such as a hallway, dormitory, or school, etc.

4. Non-air conditioned, Special location (when both conditions listed below are present)

• When piping passes through an indoor area where the indoor unit does not operate

• When the humidity is high and there is no air ow in the location where the piping is installed

Piping Insulation

PIPING CONNECTIONS

Connecting the Indoor Unit Piping to the Field-Installed Piping

Note:

If the drain hose is routed inside a room,

add insulation to prevent condensation

from forming.

1. Center align the indoor unit piping (refrigerant and drain) and the

field-installed piping, then hand tighten the flare nut.

2. Tighten the flare nut with a torque wrench.

3. Attach the drain tube piping to the

indoor unit drain hose as shown.

Indoor unit piping

Flare nut Field-installed

piping

Spanner

Field-installed

piping

Flare nut

Torque

wrench

Figure 42: Indoor Unit to Field-Installed Piping Connection.

Narrow tape

Adhesive

Drain extension

Indoor unit

drain hose

Figure 43: Extending the Drain Hose.

Refrigerant Piping System Insulation

All refrigerant piping including Y-branch connections, field-provided isolation ball valves, service valves, and elbows must be completely

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 minimum 1/2″ thick, and

thickness may need to be increased based on ambient conditions and local codes. Insulation for field-installed refrigerant piping must have

a minimum heat resistance of 248°F. Table 25 lists minimum wall thickness requirements for Ethylene Propylene Diene Methylene (EPDM)

insulation.

Multi F Standard Wall-Mounted Indoor Unit

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

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PIPING CONNECTIONS

IDU to ODU

Installing Refrigerant Piping Insulation

WARNING

Ensure all refrigerant piping is insulated. Exposed refrigerant piping may cause burns if touched.

Wrap all refrigerant and condensate piping including field-provided isolation ball valves and flexible pipe connection kits

provided by LG. All pipes must be insulated and each pipe must be separately wrapped. Any exposed piping may gener-

ate condensate or will cause burns if touched. Sufficiently insulate all cold surfaces to prevent moisture forming.

Ensure insulation material fits snugly against the refrigeration pipe with no air space between the pipe surface and the

surrounding insulation.

Protect insulation inside hangers and supports with a second insulation layer. Ensure insulation on all pipe passing

through pipe hangers, inside conduit, and/or sleeves is not compressed.

Glue all insulation joints with no air gaps. Be sure insulation material fits snugly against the refrigeration pipe with no air

space between it and the pipe. 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; and must meet local codes. Pay special attention to insulating the pipes installed in a ceiling plenum.

Figure 44: Typical Refrigerant Line Flare Fitting Insulation Detail

No Clearance

Overlap Insulation Where the

Port and the Piping Meet

Insulation for Indoor Unit Port

(Field Supplied)

Insulation for Refrigerant

Piping (Field Supplied)

Insulation Clip (Field Supplied)

Bands

Insulation

Narrow tape

Field-supplied

piping

Wide tape

Wrap with tape

Indoor unit

piping

Piping

Wrap with tape

Drain hose

Piping

Wide tape

Figure 45: Insulating the Piping.

Installation Manual

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Drain Pipe Insulation

Drain piping must have insulation a minimum of 7/32 inches thick.

1. Overlap the insulation at the connection of the field-installed piping and the indoor unit piping. Tape together so that no gaps exist.

2. Secure insulation to the rear piping housing section with vinyl tape.

3. Bundle the piping and drain hose with tape where they meet at the back of the indoor unit frame. Position the drain hose at the bottom of

the bundle (positioning the drain hose at the top of the bundle may cause the drain pan to overflow inside the indoor unit).

Drain Piping

Checking the Drainage System

Drain pan

Drain

hose

Drain hose

connection

Check for

leaks

Check for

leaks

Figure 46: Checking the Drainage System.

Drain Slope

Drain hose should point down so water can flow away easily. The

gradient for drain piping should be at least 1/50 to 1/100. Ensure any

holes through ceilings, walls, etc., are large enough to accommodate

both the drain piping and any insulation.

1. Pour water on the indoor unit evaporator. Do not use any other

liquid to test the drain.

2. Ensure the water flows through and out of the hose and away

from the indoor unit without leaking.

PIPING CONNECTIONS

Drain Piping

Indoor unit

Gradient of at least 1/50~1/100

Figure 47: Flexible Drain Hose

Connection.

Clamp the Flexible Drain Hose Connection

The standard wall-mounted indoor units have a factory-provided flexible pipe (13/16” O.D./ 5/8” I.D.) to drain condensate water. The

flexible pipe connects to field-provided drain pipe. Use materials that comply with local codes for drain pipe and insulation.

1. Install the flexible drain pipe as straight as possible; sharp angles may cause the pipe to deteriorate and may crack over time.

2. Connect the flexible drain pipe with a round clamp. If the flexible drain pipe is not

installed properly, water will leak from the connection.

3. Do not include a reverse slope in the drain connection.

Figure 48: Drain Piping Gradient Recommendation.

Metal clamp

Drain pan

Insulation

Flexible drain hose

Insulation

Figure 49: Indoor Unit with Gravity Drain.

Multi F Standard Wall-Mounted Indoor Unit

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

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ELECTRICAL WIRING

• All power wiring and communication cable installation must be

performed by trained service providers working in accordance with

local, state, and National Electrical Code regulations related to

electrical equipment and wiring, and following the instructions in

this manual. Electric shock can cause physical injury or death.

• Undersized wiring may lead to unacceptable voltage at the unit and

may cause a fire hazard.

• Properly ground the Multi Zone outdoor and indoor units. Ground

wiring must always be installed by a trained technician Ground wiring

is required to prevent accidental electrical shock during current

leakage.

• 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 National Electrical

Code-approved earth ground can result in electric shock, physical

injury or death.

• Verify that the branch switch and circuit breaker are set to OFF

before installing the wiring system. Electric shock can cause physi-

cal injury or death.

• Install appropriately sized breakers / fuses / overcurrent protection

switches and wiring in accordance with local, state, and National

Electrical Code regulations related to electrical equipment and wir-

ing, and following the instructions in this manual. Using an over-

sized breaker or fuse may result in electric shock, physical injury or

death.

• Consider ambient conditions (temperature, direct sunlight, inclem-

ent weather, etc.) when selecting, installing, and connecting the

power wiring.

• Properly ground the Multi Zone outdoor and indoor unit. Improperly

grounded wire can cause communication problems from electrical

noise, and motor current leakage. Ground wiring must always be

installed by a trained technician.

• If the system operates in reversed phase, it may damage the com-

pressors and other components.

• If there is a possibility of reversed phase, phase loss, momentary

blackout, or the power goes on and off while the system is

operating, install a field-supplied phase loss protection circuit.

• 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 National Electrical

Code-approved earth ground can result in property damage and

equipment malfunction.

• Install appropriately sized breakers / fuses / overcurrent protection

switches and wiring in accordance with local, state, and National

Electrical Code regulations related to electrical equipment and

wiring, and following the instructions in this manual. Using an

oversized breaker or fuse may result in equipment malfunction and

property damage.

• Use only copper wiring that is stranded and shielded with the wires

separately insulated.

•

Do not use a multi-conductor cable with more than five (5)

wires in one (1) core.

• Power wiring and communications cable sizes must comply with

applicable federal UL / ETL, state, and local codes.

• Do not operate the air conditioning system until the refrigerant

piping installation is complete. Operating the system before refrig-

erant piping is finalized may damage the compressor.

• Install a ground wire for the outdoor units, indoor units, and branch

distribution units.

• Install a main shutoff switch or circuit breaker that interrupts all

power sources simultaneously (circuit breaker should be resistant

to electromagnetic currents).

• Use ring terminals to attach the wiring. Verify that all power wiring

and communications cable terminals are securely attached. Ensure

enough slack is included in the wiring and cables to avoid damag-

ing the connections.

• Use a conduit to protect the power wiring.

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ELECTRICAL WIRING

Ring Terminal

Power Wiring

Figure 50: Close up of a Typical Ring Terminal

: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.

Figure 51: Proper and Improper Power Wiring Connections

Power Wiring Specications and Best Practices

Line Voltage Wiring and Communications Cable Installation

For both Multi F and Multi F MAX systems, line voltage is wired to the outdoor unit only. The outdoor unit will supply power to the

branch distribution units (Multi F MAX systems only) and the indoor units through the power wiring/communications cable.

Electrical Specifications

1. Multi F and Multi F MAX Outdoor Units: 1Ø, 208-230V, 60Hz

2. Indoor units/Branch Distribution Units (Multi F MAX systems only): 1Ø, 208-230V, 60Hz from ODU (Indoor units draw minimal power.)

3. Select power supply wire type and size based on NEC and local codes. Maximum voltage uctuation ±10% of the nameplate rated value.

4. Properly ground the outdoor unit per NEC and/or local code.

5. Use only copper wiring that is stranded and shielded with the wires separately insulated.

Power Wiring/Communications Cable Specications

• From Multi F Outdoor Units to Indoor Units = 4 x 18AWG

• From Multi F MAX Outdoor Units to Branch Distribution Units = 4 x 16AWG

• From Multi F MAX Branch Distribution Units to Indoor Units = 4 x 18AWG

• Maximum Allowable Temperature for Wiring: 194°F

• Indoor Unit(s) to Wired Controller: Three-core cable

• Multi F System Maximum Cable Length: 82 ft.

• Multi F MAX System Maximum Cable Length:

- Outdoor Unit to Branch Distribution Unit(s): 180.4 ft.

- Branch Distribution Unit(s) to Indoor Unit(s): 49.2 ft.

GN/YL

13/16 inch

Figure 52: Power Wiring and Communica-

tions Cable from the Multi F ODU to the

IDUs, or from the Multi F MAX ODU to the

BDUs and from the BD Unit to the IDUs.

Multi F Standard Wall-Mounted Indoor Unit

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ELECTRICAL WIRING

• If power wires are not properly terminated and firmly attached, there is risk of fire, electric shock, and physical injury or death.

Power Wiring Specications and Best Practices/Controller Options

Power Supply/Power Wiring Specifications, continued

Communication Cables Between the Wall Indoor Unit and the Controller

• Simple Controllers: eld-provided, 18 gauge, stranded and shielded, four-conductor communication cable.

• All other Central Controllers: eld-provided, 18 gauge, stranded and shielded, two-conductor communication cable.

• Insulation material as recommended by local code.

• Connect all central control devices such as ACP, BACnet

and LonWorks

gateways, and energy recovery ventilators all on the same cable.

Order does not matter. Polarity does. Keep “A” terminals with “A” terminals, and “B” terminals with “B” terminals.

• Starting at the outdoor unit, terminate the cable on terminals Internet A and Internet B. Route the cable as needed between each device.

• Use a four (4) conductor, shielded, stranded cable between the

Multi Zone outdoor unit and the indoor units.

• Minimum 18 gauge shielded CVVS or CPEVS cable.

• Insulation material as required by local code.

• Rated for continuous exposure of temperatures up to 140°F.

• Maximum allowable cable length: 984 feet.

• Firmly attach the cable; provide slack but secure in a way to pre-

vent external forces from being imparted on the terminal block.

• Wiring should be completed without splices.

• Terminate the cable shield to a grounded surface at the outdoor

unit only.

Note:

• Always verify the communication cable is connected to a communications terminal on the Multi Zone unit. Never apply line voltage

power to the communication cable connection. If contact is made, the PCBs may be damaged.

• The shield of the communications cable connecting the outdoor unit to the indoor unit should be grounded only to the outdoor unit frame.

• Tie the shield of each cable segment together using a wire nut at each indoor unit. Maintain polarity throughout the communication network.

• Position the 4-conductor ODU/IDU communications and power cable away from the input line voltage wiring.

General Power/Communication Cable Specifications

Note:

• Never apply line voltage power to the communications cable terminal block. If contact is made, the PCBs may be damaged.

• Always include some allowance in the wiring length when terminating. Provide some slack to facilitate removing the electrical

panels while servicing.

• 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.

Controller Options

Refer to Table 19 as to which remote controller model is used for each IDU. Once all wiring is connected to the indoor and outdoor units be

sure to test the accompanying remote controllers for performance. As always, follow all safety warnings and notes when operating the units

using the remote controller. Additionally, all of the Multi F/Multi F Max outdoor models can use the following controllers when accompanied

with the PI 485 VNet Accessory:

Multi Zone IDU Model Wireless Controller Model

LSNXXXHSV4 AKB73835312

LMNXXXHVT AKB73635606

Table 26: IDU Models and Associated Wireless Controller Model

• AC Smart

• ACP

• BACnet®

• LonWorks®

• LGMV

BACnet® is a registered trademark of ASHRAE. LonWorks® is a registered trademark of Echelon Corporation.

Installation Manual

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IDU Electrical Connections Procedure

• Be sure that main power to the unit is completely off before

beginning this procedure. Electric shock can cause severe physical

injury or death.

• Follow all safety and warning information outlined at the beginning

and throughout this manual. Failure to do so may cause bodily injury

or death.

Note:

• Follow all safety and warning information outlined at the begin-

ning and throughout this manual. Failure to do so, may cause unit

failure.

• Some units might require you to remove the Control Cover from

the terminal block area. Most Control Covers are attached with a

phillips screw head.

• Connect the electrical cable to the indoor unit by connecting the

wires to the terminals on the control board individually according to

the outdoor unit connection. Be sure that the color of the wires at

the outdoor unit along with the terminal numbers are the same as

those for the indoor unit.

• Loose wiring may cause unit malfunction, or the terminal to overheat

and catch re. Terminal screws may become loose during transport.

Properly tighten the terminal connections during installation.

Power Wiring / Communications Cable Guidelines

• These instructions are for the IDU only. For ODU wiring, refer to the ODU installation manual.

• Conrm power source specications.

• Conrm that the electrical capacity is sufcient.

• Starting current must be maintained ±10 percent of the rated current marked on the outdoor unit name plate.

• Conrm cable thickness specications.

• It is recommended that a circuit breaker is installed, especially if conditions could become wet or moist.

• Include a disconnect in the power wiring system. Add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.

• A voltage drop may cause the following problems:

1. Magnetic switch vibration, fuse breaks, or disturbance to the

normal function of an overload protection device.

2. Compressor will not receive the proper starting current.

Terminal block

Power wiring /

communications cable

Wired Remote Controlle

Terminal (Optional)

Cable restraint

Figure 53: Typical IDU Power and Communications

Cable Connections

ELECTRICAL WIRING

Indoor Unit Electrical Connections Guidelines

The general guidelines for connecting electrical and communication

cables are similar for all standard wall-mounted indoor units; how-

ever, the connections on the terminal block may differ. Depending

on your indoor unit, the location of the terminal block on the indoor

unit might vary from these typical images. Figure 53 shows typical

connections.

The electrical connections procedure includes wiring diagrams for

each type of standard wall-mounted indoor unit.

Multi F Standard Wall-Mounted Indoor Unit

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ELECTRICAL WIRING

Indoor Unit Electrical Connections Procedure

Be sure there is no power input to the system before proceeding with

these connections. There is risk of electrical shock resulting in serious

bodily injury or death.

1. At the bottom panel of the indoor unit, unsnap the latches cover-

ing the phillips head screws as shown in Figure 54.

• Normally, there are three (3) screws on the panel, however, your

indoor unit model may differ.

2. Using a phillips head screwdriver, remove the screws from the

bottom panel of the indoor unit and set aside (Figure 55).

3. Remove the bottom panel (Figure 56).

• Removal is necessary to gain access to the terminal block

located at the bottom of most indoor units.

4. Route the electrical/communications wiring through the back/bot-

tom of the indoor unit (through a knockout panel, Figure 57).

5. Using a screwdriver, connect the wires as shown in Figure 58 and

Figure 59. Also refer to the appropriate wiring diagram for the IDU

(Figure 60 through Figure 63).

• Each wire should be securely attached to the terminal block.

• Ensure the green/yellow ground cable is securely connected to

the correct screw terminal.

6. When done, reattach the bottom panel to the indoor unit, being

careful to align panel using the rear tabs.

• You might need to give the panel a gentle tap with the palm of your

hand to be sure it engages at the bottom.

7. Using a phillips screwdriver, reattach the screws to the bottom

panel and secure.

8. Once screws are in place, re-snap the latches over the screws.

9. If all other piping and electrical wiring to the outdoor unit has

been completed, you can turn the system on to test.

• If you have not completed the piping connections, do not turn

power on at this time. Be sure to complete all other piping,

(along with drain hose) and wiring to the system.

Figure 54: Latch over Screws on Bottom Panel, Indoor Unit

Figure 55: Remove Screws from Bottom Panel

Figure 56: Removal (and Reattachment) of Bottom Panel

Figure 57: Indoor Unit Knockout (Communication Wires)

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ELECTRICAL WIRING

Figure 58: Typical Indoor Unit Terminal Block with Grounding Cable

Indoor Unit Electrical Connections

Terminal Block

Expanded View

Grounding

Cable

Connecting Cables

Cable Restrainer

180HSV4

Figure 59: Typical Indoor Unit Terminal Block Connections

Figure 60: Indoor Unit to Outdoor Unit / Branch

Distribution Unit Terminal Connections—LMN077HVT and LMN157HVT.

Figure 61: Indoor Unit to Outdoor Unit / Branch

Distribution Unit Terminal Connections—LMN247HVT.

Figure 62: Indoor Unit to Outdoor Unit / Branch

Distribution Unit Terminal Connections—LSN090HSV4 and LSN120HSV4.

Figure 63: Indoor Unit to Outdoor Unit / Branch

Distribution Unit Terminal Connections—LSN180HSV4.

Indoor Unit Terminal Block

GND

Outdoor Unit Terminal Block or

Branch Distribution Unit Terminal Block

(Multi F MAX Systems Only)

GND

GRN / YLW

3 or S

3(C)2(L2)1(L1)

Indoor Unit Terminal Block

1(L1 )2(L2)

GND

Outdoor Unit Terminal Block or

Branch Distribution Unit Terminal Block

(Multi F MAX Systems Only)

GND

GRN / YLW

3 or S

Indoor Unit Terminal Block

GND

Outdoor Unit Terminal Block or

Branch Distribution Unit Terminal Block

(Multi F MAX Systems Only)

GND

GRN / YLW

3 or S 2(L2)1(L1)

2(L2)

1(L1)

Indoor Unit Terminal Block

GND

Outdoor Unit Terminal Block or

Branch Distribution Unit Terminal Block

(Multi F MAX Systems Only)

GND

GRN / YLW

3 or S2(L2)1(L1)

1(L1) 2(L2)

Multi F Standard Wall-Mounted Indoor Unit

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ELECTRICAL WIRING

Additional screens can be accessed by tabs on the main screen.

Additional screens include the following:

1. Cycleview (Figure 65): Graphic of internal components including:

• Compressors showing actual speeds

• EEVs

• IDUs

• Temperature and pressure sensors

• Four-way reversing valve

2. Graph: Full screen graph of actual high and low pressures and high

and low pressure limits. A sliding bar enables user to go back in

time and view data.

3. Control FTN: Enables user to turn on IDUs in 1.8°F increments.

4. Useful Tab

• Unit Conversion: Converts metric values to imperial values.

5. 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 tempera-

ture

• Actual low pressure/saturation tempera-

ture

• Suction temperature

• Inverter compressor discharge tempera-

ture

• 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 compres-

sor operation

indicator light

• Liquid injection

valves’ operation

indicator lights

• Hot gas bypass

valve operation

indicator light

• Four-way revers-

ing valve opera-

tion

indicator light

• Pressure graph showing actual low pres-

sure and high

pressure levels

• Error code display

• Operating mode indicator

• Target high pressure

• Target low pressure

• PCB (printed circuit board) version

• Software version

• Installer name

• Model number of IDUs

• Site name

• Total number of connected IDUs

• Communication indicators

• IDU capacity

• IDU operating mode

• IDU fan speed

• IDU EEV position

• IDU room temperature

• IDU inlet pipe temperature

• IDU outlet pipe temperature

• IDU error code

LG Monitoring View (LGMV) Diagnostic Software

LGMV software (PRCTSL1 and PRCTFE1) allows the service technician or commissioning agent to connect a computer USB port to the

outdoor unit’s main printed circuit board (PCB) using an accessory cable. The monitoring screen for LGMV allows the user to view the fol-

lowing real time data on one screen (Figure 64):

Figure 64: MV Real-time Data Screen

Figure 65: MV Cycleview

Note:

Images on these pages are examples of LGMV screenshots. Actual images

may differ depending on the version of the software and the unit installed.

Self Diagnosis Functions

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Self Diagnosis Functions

• Data Saving Start: Recording of real time data to a separate le created to be

stored on the user’s computer.

• Data Loading Start: Recorded data from a saved “.CSV” le can be loaded to

create an LGMV session.

6. Monitoring

• Electrical: The lower half of main screen is changed to show Inverter

Compressor Amps, Volts, Power Hz, Inverter control board fan Hz.

Figure 66: MV Control Indoor Units Screen

The software is available in a high version with all of the listed

features The low version has all features as the high version without

Target High Pressure and Target Low Pressure values shown on

main screen.

In lieu of connecting to the outdoor unit, there is the option to con-

nect to an IDU with the use of a USB to RS-485 connector kit. When

connected through an IDU, the user will not be able to record data.

This software can be used to both commission new systems and

troubleshoot existing systems. LGMV data can be recorded to a

“.CSV” file and emailed to an LG representative to assist with diag-

nostic evaluations.

Error Codes

LGMV software helps the service technician or commissioning agent

to troubleshoot system operation issues by displaying malfunction

codes (Figure 67). These error codes can be seen on the main

screen of the LGMV software program. For an overview of Single

Zone unit error codes, see Error Codes section. For detailed infor-

mation on how to troubleshoot individual error codes, see the Single

Zone Service Manual.

Figure 67: Error Code Screen

Recommended Minimum PC Configuration:

• CPU: Pentium

IV 1.6 GHz

• Main Memory: 1G

• Operating System: Windows

XP/Vista/7 32 bit (recommended), 64 bit

• Hard Disk: 600 MB when operating

• MS Ofce 2003, 2007 (recommended) for select reporting functions

LG Monitoring View (LGMV) Diagnostic Software and Cable - Continued

Note:

Images on these pages are examples of LGMV screenshots. Actual images

may differ depending on the version of the software and the unit installed.

Multi F Standard Wall-Mounted Indoor Unit

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ELECTRICAL WIRING

LG SIMS - Self Diagnosis Functions

LG SIMs

WLAN Module

LG SIMs App

on Smart Phone

The SIMs WLAN module and the smart phone app together provide monitoring and troubleshooting

capability for LG Duct Free Systems. SIMs functions only with LG Duct Free products (Figure 68).

SIMs can display and graph operational data for the air conditioner system including the indoor unit

and the outdoor unit. SIMs also displays error codes and a troubleshooting guide. A full copy of

the LG SIMs Smart Inverter Monitoring System User’s Manual is available on the www.lghvac.com

website.

To use SIMs you must be a trained HVAC service technician familiar with variable refrigerant

flow (VRF) systems in general and with LG’s Duct Free System products. You should under-

stand the inverter air conditioning operation cycle, the meaning of the data displayed by SIMs,

and how to use the data to troubleshoot the system.

Figure 69 shows a typical Multi F configuration used with the SIMs module and app.

Note:

• The Duct Free System air conditioning system must run for

at least 15–20 minutes before data collected by SIMs 2.0 is

valid for troubleshooting.

• You must have the free SIMs app correctly installed on your

smart phone before using SIMs.

• Some ODUs have an LGMV extension cable accessed by

removing the side handle cover. If the ODU does not have

this extension cable, access the LGMV connector by remov-

ing the top cover of the ODU.

High voltages capable of causing death are used in

this equipment. Outdoor unit power remains connected

during this procedure. Take extreme caution not to

touch electrical components or connections. Failure to

observe this warning can result in death or severe injury.

Figure 68: LG SIMs App and WLAN Module

Figure 69: SIMs WLAN Module to a Typical Multi F System

Figure 70: SIMs App Main Info Screen

The main screen (Figure 70) is the first screen displayed after wireless

connection is established. Tap the Main Info tab to display current read-

ings regarding your indoor and outdoor unit(s). The Operational Info area

of the screen will show active functions or modes by illuminating the light

to the right of the function.

Additional Help information can be accessed by tapping the Help Menu

buttons at the bottom of this screen.

Operational

Information

AC Cycle

Information on

Main Info Tab

Help Menu

(File is Factory Use Only)

SIMs App Main Info Screen

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LG SIMS - Self Diagnosis Functions

SIMs App Screens

Outdoor Info/

Component Screen

Displays the following

information:

• Frequency

• FAN1 RPM

• FAN2 RPM

• DC Link

• Current

• Voltage

• EEV Mode

• Restart Timer

• Comp Mode

• EEV

Indoor Info Tab

Displays the following

information:

• Frequency

• Operation

• THM Mode

• REM Mode

• FAN

• EEV

• Air Temp

• Pipe-in

• Pipe-mid

• Pipe-out

Graph Info Tab

This tab, has three sub

sections:

• IDU - Indoor Unit

Temperature graph.

Displays IDU

information in graph

format. Information

displayed is for the

IDU # selected on

the Main screen.

• ODU - Outdoor Unit

Temperature and

Frequency graph.

Displays ODU

information in graph

format.

• ODU Electric

- Outdoor Unit

Electric data graph

is displayed.

Outdoor Info/

Temperature Screen

Displays the following

information:

• Inv TD

• Suction

• Discharge

• Cond Mid

• Cond Out

• Heatsink

• Air Temp

Multi F Standard Wall-Mounted Indoor Unit

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Wall-Mounted Sensor Installation

Proper indoor unit operation depends on the location of the room sensor. A good location will protect the zone controller from direct sunlight

and external local sources of water vapor, and heated or cooled air. If no mounting height was specified by the building designer, place the

handy box approximately fifty-five (55) inches above the finished floor.

• It may be necessary to use a handy box that is sized in metric units, depending on the controller model. Check with your LG representative

to verify which size of handy box is needed for the zone controller in question.

• Use only LG-supplied communications cable. Using eld-supplied cable may result in communications problems between the zone control-

ler and the indoor unit.

• Maintain the minimum distance required between the communications cable and power wiring. The minimum required space between

the two is dependent on the voltage of the power wiring. Refer to the appropriate Multi V Outdoor Unit Engineering Manual for minimum

distance specications.

Do not route power wiring and communications cables in the same conduit.

Do not cut the quick-connect plugs off or adjust the length of the cable. Keep the communications cable away from high voltage wires

and electromagnetic field (EMF) producing equipment.

ELECTRICAL WIRING

Wall-Mounted Controller Installation

Since the room temperature sensor is inside the remote controller, the remote controller should be installed in a place away from direct sun-

light, high humidity and direct supply of hot or cold air to maintain proper space temperature. Install the remote controller about 5 ft above

the floor in an area with good air circulation and an average temperature.

Do not install the remote controller where it can be affected by the following:

• Drafts or dead spots behind doors and in corners

• Hot or cold air from ducts

• Radiant heat from sun or appliances

• Concealed pipes and chimneys

• Uncontrolled areas such as an outside wall behind the remote controller

This remote controller is equipped with a seven segment LED display. For proper

display of the remote controller LED’s, the remote controller should be installed

properly as shown below. The standard height is 4 - 5 ft from floor level.

1. Pull communications cable between the zone controller handy box (if used) and

the indoor unit. The wall-mounted zone controller comes with a thirty (33) foot

length of cable.

2. Store a minimal amount of cable in the handy box. Any additional cable should be

coiled and stored near the indoor unit control panel.

3. If additional cable length is needed, order a thirty (33) foot LG Wired Remote

Group Control Extension cable (Model No. PZCWRC1).

4. If the cable between the zone controller and the indoor unit is too long, do not cut the cable and shorten. Coil any spare communications

cable, tie-wrap it, and leave it next to the indoor unit location.

5ft

yes

Remote Controller

TEMP

Remote Controller

TEMP

Remote Controller

TEMP

Figure 71: Wired Remote Controller Installation

Optional Wall-Mounted Sensor and Controller

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Troubleshooting Using Error Codes

Refer to Table 27 for information on error codes generated from

the indoor and outdoor units. These codes are the most common

that will manifest through these units. Your particular model duct

free system might generate additional codes not listed here. Please

contact LG Support if you see these types of errors and a simple

power down and boot up has not corrected the issue. You should not

attempt to fix the system yourself.

Error Codes

• Refer to the gures below for your particular indoor unit’s LED

conguration.

• Indicate different types of unit failures, assists in self-diagnosis

and to track the frequency of occurrence.

• Error codes are shown on the LEDs of indoor units, wired

remote controller, the Single Zone unit control board, and LG

Monitoring View (LGMV) Diagnostic Software.

• If two or more errors occur simultaneously, the lower error code

number is displayed rst.

• After error is resolved, the error code does not display.

Error Codes

Decoding the Error Display

The first and second number on the LED indicates error number.

Example: 21 = LED1 (Green light) 2x blink, LED2 (Red light) 1x blink

Error Code Nomenclature Definitions

• MICOM: Non-volatile memory chip where unit setup information

is stored.

• EPROM: Non-volatile memory chip where device identication,

size, and factory dened default component operating param-

eters are stored.

LED 1

(UNITS PLACE)

LED 2

(TENS PLACE)

Receiver

Figure 72: IDU LS-HSV4 Models

Error

Code

Description

No. of Times Indoor Unit

LEDs Blink

LED1

(Plasma LED)

LED2

(Power LED)

1 Indoor unit room temperature sensor error

1X -

2 Indoor unit inlet pipe sensor error 2X -

4 Float switch error (optional) 4X -

5 Communication error between indoor unit and outdoor units - 5X

6 Indoor unit outlet pipe sensor error 6X -

9 Indoor unit EPROM error 9X -

10 Indoor unit BLDC motor fan lock - 1X

12 Indoor unit middle pipe sensor error 2X 1X

Table 27: Multi Zone Wall-Mounted Indoor Unit Error Codes

TROUBLESHOOTING

Multi F Standard Wall-Mounted Indoor Unit

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Error Codes

Error

Code

Description

No. of Times Indoor Unit

LEDs Blink

LED1

(Plasma LED)

LED2

(Power LED)

21 DC Peak (IPM Fault); Compressor DC voltage was too high

2X 1X

22 Current Transformer2 (CT2) error; Alternating current (AC) input too high 2X 2X

23 DC Link Low Volt 2X 3X

25 AC Low/High Volt 2X 5X

26 DC Comp Position Error (not providing rotation), Locking 2X 6X

27 PSC Fault; Current to inverter compressor between AC and DC converter circuit too high 2X 7X

28 Inverter compressor DC voltage is too high 2X 8X

29 Inverter compressor amperage is too high 2X 9X

31 Current-to-current transformer (CT) thermistor is too low 3X 1X

32 Inverter Compressor Discharge Pipe (D-Pipe) Overheat 3X 2X

40 CT Sensor Error; Thermistor is disconnected or shorted out 4X -

41 D-Pipe Sensor INV is disconnected or shorted out 4X 1X

44 Outdoor Air Sensor is disconnected or shorted out 4X 4X

45 Middle thermistor of outdoor unit condenser coil is disconnected or shorted out 4X 5X

46 Outdoor unit suction line thermistor is disconnected or shorted out 4X 6X

48 Outdoor unit coil outlet (liquid line) thermistor is disconnected or shorted out 4X 8X

53 Communication failure from outdoor unit to indoor unit 5X 3X

60 Outdoor unit printed circuit board (PCB) EPROM check sum error 6X -

61 Outdoor unit condenser coil temperature is too high

6X 1X

62 Outdoor unit inverter compressor PCB heat sink temperature is too high 6X 2X

63 Condenser coil pipe thermistor temperature is too low 6X 3X

65 Heat sink thermistor has disconnected or has shorted out 6X 5X

67 Outdoor brushless direct current (BLDC) fan motor lock error 6X 7X

Troubleshooting Using Error Codes - Continued

Refer to Service Manuals posted on www.lghvac.com for a full description of all error codes and workarounds.

Table 22: Multi Zone Wall-Mounted Indoor Unit Error Codes - Continued

TROUBLESHOOTING

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Amount of

Factory-Charged

Refrigerant per

Outdoor Unit

Amount of

Additional Re-

frigerant Trim

Charge

Refrigerant Concentration Limit (RCL) Calculations

To calculate total refrigerant amount per system:

Cautions for Refrigerant Leaks

ASHRAE Standards 15-2010 and 34-2010 offer guidelines that address refrigerant safety and the maximum allowable concentration of refrig-

erant 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 refrigerant, 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 may 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.

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.

American Society of Heating, Refrigeration and Air Conditioning Engi-

neers, Inc. (ASHRAE). Atlanta, GA. ASHRAE, Inc. Information about

ASHRAE Standard 15-2010 / 34-2010 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 small-

est 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 Single 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

. In special occupied spaces, however,

such as hospitals and nursing homes where occupants may have

limited mobility, the allowable RCL limit is cut in half. See ASHRAE

Standard 34-2007 and local codes for detailed information.

RCL (lbs./ft

) =

Total System Refrigerant Charge (lbs.)

Volume of Smallest Occupied Space (ft

)

Refrigerant Leaks

CAUTIONS FOR REFRIGERANT LEAKS

Multi F Standard Wall-Mounted Indoor Unit

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

MUL

System ID No.: _________________________________________________ Indoor Unit ID.: ____________________________________

Checked by: __________________________________ Date:__________________ Signature: ___________________________________

PAGE 1 of 2

INSTALLATION CHECKLIST

Major Component Rough-In

Description Check

Single Zone unit was connected properly per local code and the product installation procedures.

All literature and bagged accessories have been removed from the fan discharge.

Indoor unit was installed, properly supported, and located indoors in a non-corrosive environment.

Single Zone unit’s gravity condensate drain line was connected and routed where it properly drains away or, if installed in a

mechanical room, was connected and properly routed to a drain terminal.

Piping and Insulation

Description Check

Copper

Over 5/8 inches—Rigid ACR only.

5/8 inches and under—Can use soft ACR.

15% silver brazing material only.

All refrigerant pipes and valves were insulated separately. Insulation butts up against the walls of the indoor units. No gaps or

cracks. Insulation was not compressed at clamps and hangers.

Brazing Practices

Description Check

Medical grade (there are 4 available) dry nitrogen for purging during brazing was used (constant 3 psi while brazing).

Installation

(For more information on any procedure, refer to the detail provided in the installation section.)

Refrigerant Piping

Description Check

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.

All long runs of straight pipe were provided with expansion loops.

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.

Ensure all field made flares are 45°. Use factory-supplied flare nuts only.

Pipe segments were properly supported and all wall penetrations were sleeved.

Pipe insulation was not compressed at any point.

No oil traps, solenoid valves, sight glasses, filter driers, or any other unauthorized refrigerant specialties were present.

Best practice including a minimum of 20″ of straight pipe was installed between each elbow.

Installation Manual

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

MUL

INSTALLATION CHECKLIST

Condensate Pump / Drain Installation

Power Wire and Communications Cables

Description Check

Power wiring was connected to a single phase 208-230V source.

Ground wire was installed and properly terminated at the unit.

The power supplied was clean with voltage fluctuations within specifications. (±10% of nameplate).

Power wiring to the Single Zone outdoor unit was installed per all local electrical code requirements.

Power wiring to the indoor unit was installed per all local electrical code requirements.

LG-supplied cable was used between the indoor unit and its zone controller. No cables were spliced and no wire caps are

present.

Communication type RS-485–BUS type.

All communications cables were a minimum of 18-AWG, four (4) conductor, shielded, and stranded, with insulation material per

local code. Cable segment shields were tied together.

Used appropriate crimping tool to attach ring or spade terminals at all power wiring and control cable terminations.

All power and control wires were properly separated using the recommended distance provided in the product installation manual.

For further technical materials such as submittals, engineering

manuals, service manuals, and catalogs, visit www.lghvac.com.

System ID No.: _________________________________________________ Indoor Unit ID.: ____________________________________

Checked by: __________________________________ Date:__________________ Signature: ___________________________________

PAGE 2 of 2

Multi F Standard Wall-Mounted Indoor Unit

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

MUL

Installation Manual

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

MUL

Who to call for assistance

Freight Damage and Unit Replacements Your LG Manufacturer Representative

Missing Parts Your LG Manufacturer Representative

Freight Damage and Unit Replacements Your LG Manufacturer Representative

Received Wrong Indoor Unit Model Your LG Manufacturer Representative

Installation, Startup, and Commissioning Technical Assistance 1-888-865-3026

For warranty information, visit www.lghvac.com.

IM-Multi-F_StdWallMount-03-15

Original Issue

LG Electronics

Commercial Air Conditioning Division

11405 Old Roswell Road

Alpharetta, Georgia 30009

www.lghvac.com

LG Customer Information Center, Commercial Products

1-888-865-3026 USA

Follow the prompts for commercial A/C products and parts.

20001747 ISO 9001: 2008

LG ELECTRONICS INC.

LG Electronics LSN180HSV4 LG Air Conditioner Cooling Area, Adjustable Air Direction

Product's Documents

User Manual

Specifications

LG Electronics LSN180HSV4 Questions and Answers