LG Electronics ARWN072BA2 User Manual

INSTALLATION MANUAL

AIR CONDITIONER

• Please read this installation manual completely before installing the product.

• Installation work must be performed in accordance with the national

wiring standards by authorized personnel only.

• Please retain this installation manual for future reference after reading

it thoroughly.your set and retain it for future reference.

P/NO : MFL63748901

www.lg.com

MODELS: ARWN Series

ENGLISH FRANCAIS

ESPAÑOL

2 Outside Unit

ARWN Series Outside unit Installation Manual

TABLE OF CONTENTS

Safety Precautions .........................................................................................................3

Installation Process .......................................................................................................7

Outside units Information..............................................................................................8

Environment-friendly Alternative Refrigerant R410A ..............................................10

Select the Best Location..............................................................................................10

Installation space .........................................................................................................11

Water control ...............................................................................................................13

Lifting method ..............................................................................................................15

Installation ....................................................................................................................16

Refrigerant piping installation ....................................................................................20

Protection device unit..................................................................................................25

Refrigerant piping system ..........................................................................................27

Y branch pipe and header branch pipe type .............................................................44

Leakage test and vacuum ...........................................................................................46

Electrical Wiring ...........................................................................................................48

Test Run ........................................................................................................................64

Cooling tower applied method ...................................................................................73

Caution For Refrigerant Leak......................................................................................74

Water Solenoid Valve Control .....................................................................................76

Variable Water Flow Control KIT(Accessory) ............................................................77

Installation Manual 3

ENGLISH

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must

be followed.

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is

classified by the following indications.

■ Meanings of symbols used in this manual are as shown below.

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage to properties only.

Be sure not to do.

Be sure to follow the instruction.

■ Installation

Have all electric work done by a licensed electrician

according to "Electric Facility Engineering Standard"

and "Interior Wire Regulations" and the instructions

given in this manual and always use a special circuit.

• If the power source capacity is inadequate or electric work is per-

formed improperly, electric shock or fire may result.

Ask the dealer or an authorized technician to install

the air conditioner.

• Improper installation by the user may result in water leakage, electric

shock, or fire.

Always ground the product.

• There is risk of fire or electric shock.

Always install a dedicated circuit and breaker.

• Improper wiring or installation may cause fire or electric shock.

For re-installation of the installed product, always con-

tact a dealer or an Authorized Service Center.

• There is risk of fire, electric shock, explosion, or injury.

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

(customer).

• There is risk of fire, electric shock, explosion, or injury.

Do not store or use flammable gas or

combustibles near the air conditioner.

• There is risk of fire or failure of product.

Use the correctly rated breaker or fuse.

• There is risk of fire or electric shock.

Do not install the unit outside.

• Otherwise it may cause fire, electric shock and trouble

Do not install the product on a defective installation stand.

• It may cause injury, accident, or damage to the product.

When installing and moving the air conditioner to

another site, do not charge it with a different refrigerant

from the refrigerant specified on the unit.

• If a different refrigerant or air is mixed with the original refrigerant, the

refrigerant cycle may malfunction and the unit may be damaged.

Do not reconstruct to change the settings of the pro-

tection devices.

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

shorted and operated forcibly, or parts other than those specified by

LGE are used, fire or explosion may result.

4 Outside Unit

Safety Precautions

Ventilate before operating air conditioner when gas

leaked out.

• It may cause explosion, fire, and burn.

Securely install the cover of control box and the panel.

• If the cover and panel are not installed securely, dust or water may

enter the outside unit and fire or electric shock may result.

If the air conditioner is installed in a small room, measures

must be taken to prevent the refrigerant concentration from

exceeding the safety limit when the refrigerant leaks.

• Consult the dealer regarding the appropriate measures to prevent the

safety limit from being exceeded. Should the refrigerant leak and

cause the safety limit to be exceeded, harzards due to lack of oxygen

in the room could result.

Use a vacuum pump or Inert (nitrogen) gas when doing leakage

test or air purge. Do not compress air or Oxygen and Do not use

Flammable gases. Otherwise, it may cause fire or explosion.

• There is the risk of death, injury, fire or explosion.

n Operation

Do not damage or use an unspecified power cord.

• There is risk of fire, electric shock, explosion, or injury.

Use a dedicated outlet for this appliance.

• There is risk of fire or electrical shock.

Be cautious that water could not enter the product.

• There is risk of fire, electric shock, or product damage.

Do not touch the power switch with wet hands.

• There is risk of fire, electric shock, explosion, or injury.

When the product is soaked (flooded or

submerged), contact an Authorized Service Center.

• There is risk of fire or electric shock.

Be cautious not to touch the sharp edges when

installing.

• It may cause injury.

Take care to ensure that nobody could step on or fall

onto the outside unit.

• This could result in personal injury and product damage.

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

(Do not touch the electrostatic filter, if the unit is so equipped.)

• There is risk of physical injury, electric shock, or product failure.

n Installation

Always check for gas (refrigerant) leakage after installa-

tion or repair of product.

• Low refrigerant levels may cause failure of product.

Do not install the product where the noise or hot air from

the outside unit could damage the neighborhoods.

• It may cause a problem for your neighbors.

Keep level even when installing the product.

• To avoid vibration or water leakage.

Do not install the unit where combustible gas may leak.

• If the gas leaks and accumulates around the unit, an explosion may result.

Use power cables of sufficient current

carrying capacity and rating.

• Cables that are too small may leak, generate heat, and cause a fire.

Do not use the product for special purposes, such as pre-

serving foods, works of art, etc. It is a consumer air condi-

tioner, not a precision refrigeration system.

• There is risk of damage or loss of property.

Keep the unit away from children. The heat exchanger is

very sharp.

• It can cause the injury, such as cutting the finger. Also the damaged fin may

result in degradation of capacity.

When installing the unit in a hospital, communication station,

or similar place, provide sufficient protection against noise.

• The inverter equipment, private power generator, high-frequency medical equipment, or

radio communication equipment may cause the air conditioner to operate erroneously, or

fail to operate. On the other hand, the air conditioner may affect such equipment by cre-

ating noise that disturbs medical treatment or image broadcasting.

Installation Manual 5

ENGLISH

Safety Precautions

Do not install the product where it is exposed to sea wind (salt spray) directly.

• It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or inefficient operation.

■ Operation

Do not use the air conditioner in special environments.

• Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of

the air conditioner or damage its parts.

Do not block the inlet or outlet.

• It may cause failure of appliance or accident.

Make the connections securely so that the outside force of

the cable may not be applied to the terminals.

• Inadequate connection and fastening may generate heat and cause a fire.

Be sure the installation area does not deteriorate with age.

• If the base collapses, the air conditioner could fall with it, causing property

damage, product failure, or personal injury.

Safely dispose of the packing materials.

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

cause stabs or other injuries.

• Tear apart and throw away plastic packaging bags so that children may not

play with them. If children play with a plastic bag which was not torn apart,

they face the risk of suffocation.

Turn on the power at least 6 hours before starting opera-

tion.

• Starting operation immediately after turning on the main power switch can

result in severe

damage to internal parts. Keep the power switch turned on during the oper-

ational season.

Be very careful about product transportation.

• Only one person should not carry the product if it weighs more than 20 kg.

• Some products use PP bands for packaging. Do not use any PP bands for a means of transportation. It is dangerous.

• Do not touch the heat exchanger fins. Doing so may cut your fingers.

• When transporting the outside unit, suspending it at the specified positions on the unit base. Also support the outside unit at four points so that it cannot slip

sideways.

Do not touch any of the refrigerant piping during and after

operation.

• It can cause a burn or frostbite.

Do not operate the air conditioner with the panels or

guards removed.

• Rotating, hot, or high-voltage parts can cause injuries.

Do not directly turn off the main power switch after stop-

ping operation.

• Wait at least 5 minutes before turning off the main power switch. Otherwise

it may result in water leakage or other problems.

Auto-addressing should be done in condition of connect-

ing the power of all indoor and outdoour units. Auto-

addressing should also be done in case of changing the

indoor unit PCB.

Use a firm stool or ladder when cleaning or maintaining

the air conditioner.

• Be careful and avoid personal injury.

6 Outside Unit

Safety Precautions

When wiring:

Electrical shock can cause severe personal injury or death. Only a qualified,

experienced electrician should attempt to wire this system.

• Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked.

• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these

instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death.

• Ground the unit following local electrical codes.

• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.

• The choice of materials and installations must comply with the applicable local/national or international

standards.

When transporting:

Be careful when picking up and moving the indoor and outside units. Get a partner to help, and

bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on

the air conditioner can cut your finger.

When installing...

... in a wall: Make sure the wall is strong enough to hold the unit's weight.

It may be necessary to construct a strong wood or metal frame to provide added support.

... in a room: Properly insulate any tubing run inside a room to prevent "sweating" that can cause

dripping and water damage to wall and floors.

... in moist or uneven locations: Use a raised concrete pad or concrete blocks provide a solid,

level foundation for the outside unit. This prevents water damage and abnormal vibration.

... in an area with high winds: Securely anchor the outside unit down with bolts and a metal

frame. Provide a suitable air baffle.

... in a snowy area(for Heat Pump Model): Install the outside unit on a raised platform that is

higher than drifting snow. Provide snow vents.

When connecting refrigerant tubing

• Keep all tubing runs as short as possible.

• Use the flare method for connecting tubing.

• Check carefully for leaks before starting the test run.

When servicing

• Turn the power OFF at the main power box(mains) before opening the unit to check or repair

electrical parts and wiring.

• Keep your fingers and clothing away from any moving parts.

• Clean up the site after you finish, remember to check that no metal scraps or bits of wiring have

been left inside the unit being serviced.

WARNING

• Refer to local code for all wiring size.

• Installation or repairs made by unqualified persons can result in hazards to you and others.

Installation of all field wiring and components MUST conform with local building codes or, in the absence of local

codes, with the National Electrical Code 70 and the National Building Construction and Safety Code or Canadian

Electrical code and National Building Code of Canada.

• The information contained in the manual is intended for use by a qualified service technician familiar with safety

procedures and 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 and/or death.

Installation Process

Installation Manual 7

ENGLISH

Installation Process

The foundation must be level even

Outside unit foundation work

Avoid short circuits and ensure

sufficient space is allowed for service

Installation of outside unit

Refer to automatic addressing flowchart

Automatic addressing of indoor unit

In the final check for 24hours at 3.8 MPa(38.7 kgf/cm

) there must be no drop in pressure.

Airtight test

Multiple core cable must not be used.

(suitable cable should be selected)

Electrical work

(connection circuits and drive circuits)

Make sure no gaps are left where

the insulating materials are joined

Heat insulation work

Make sure airflow is sufficient

Duct work

Adjust to downward gradient

Drain pipe work

Special attention to dryness,

cleanness and tightness

Refrigerant piping work

Check model name to make

sure the fitting is made correctly

Installation of indoor unit

Take account of gradient

of drain piping

Sleeve and insert work

Make relationship between outside, indoor, remote controller, and option connections clear.

(Prepare control circuit diagram)

Preparation of contract drawings

Indicate clearly who is to be responsible for switch settings

Determination of division work

The vacuum pump used must have a capacity of reaching at least 5 torr, more than 1 hour

Vacuum drying

Recharge correctly as calculated in this manual. and record the amount of added refrigerant

Additional charge of refrigerant

Make sure there are no gaps left between the facing materials used on the ceiling

Fit facing panels

Run each indoor unit in turn to make sure the pipe work has been fitted correctly

Test run adjustment

Explain the use of the system as clearly as possible to your customer and make sure all relevant

documentation is in order

Transfer to customer with explanation

Preheat the crank case with the electrical heater for more than 6 hours.

• The above list indicates the order in which the individual work operations are normally carried out but this order may be

varied where local conditions warrants such change.

• The wall thickness of the piping should comply with the relevant local and national regulations for the designed pres-

sure 3.8MPa.

• Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in its liquid state.(If the refriger-

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

Outside units Information

8 Outside Unit

Outside units Information

Power Supply: Outside Unit (3Ø, 208/230V, 60Hz)

■ Heat pump

• Ratio of the running Indoor Units to the Outside: Within 10 ~ 100%

• A combination operation over 100% cause to reduce each indoor unit capacity.

■ Combination Ration(Minimum : 50%)

Notes:

* We can guarantee the operation only within 130% Combination.

Number of outside units

Connection Capacity

3Ø, 208/230V, 60Hz 3Ø, 480V, 60Hz

Single outside unit 130% 130%

Double outside units 130% 130%

Triple outside units 130% 130%

System Capacity HP(Ton)

Model Name

Product Refrigerant Charge lb(kg)

CF(Correction Factor) lb(kg)

Maximum Connectable No. of Indoor Units

Net Weight lb

Dimensions(WxHxD) inch

Refrigerant Liquid inch(mm)

Connecting Pipes Gas inch(mm)

Water Inlet mm

Connecting Pipes Outlet mm

Drain Outlet inch(mm)

8(6.5) 16(12.5) 24(19.0)

ARWN072BA2 ARWN144BA2 ARWN216BA2

16.1(7.3) 19.4(8.8) 19.4(8.8) + 16.1(7.3)

- - -

16 32 49

(374.8)×1 (524.7)×1

(524.7)×1 + (374.8)×1

(154)×1 (230)×1 (230)×1 + (154)×1

(30-13/32×44-3/32×21-1/2)×1 (30-13/32×44-3/32×21-1/2)×1 (30-13/32×44-3/32×21-1/2)×2

(772×1,120×547)×1 (772×1,120×547)×1 (772×1,120×547)×2

3/8(9.52) 1/2(12.7) 3/4(19.05)

7/8(22.2) 1-1/8(28.58) 1-3/8(34.9)

PT32A (Female) PT40A (Female)

PT40A + PT32A (Female)

PT32A (Female) PT40A (Female)

PT40A + PT32A (Female)

3/4(22) (Female) 3/4(22) (Female) 3/4(22) (Female)

Outside units Information

Installation Manual 9

ENGLISH

Power Supply: Outside Unit (3Ø, 460V, 60Hz)

■ Heat Pump

System Capacity HP(Ton)

Model Name

Product Refrigerant Charge lb(kg)

CF(Correction Factor) lb(kg)

Maximum Connectable No. of Indoor Units

Net Weight lb

Dimensions(WxHxD) inch

Refrigerant Liquid inch(mm)

Connecting Pipes Gas inch(mm)

Water Inlet mm

Connecting Pipes Outlet mm

Drain Outlet inch(mm)

32(25.5) 40(32.0) 48(38.0)

ARWN288BA2 ARWN360BA2 ARWN432BA2

19.4(8.8) + 19.4(8.8)

19.4(8.8) + 19.4(8.8) + 16.1(7.3) 19.4(8.8) + 19.4(8 8) + 19.4(8.8)

- - -

64 64 64

(524.7)×2 (524.7)×2 + (374.8)×1 (524.7)×3

(230)×2 (230)×2 + (154)×1 (230)×3

(30-13/32×44-3/32×21-1/2)×2 (30-13/32×44-3/32×21-1/2)×3 (30-13/32×44-3/32×21-1/2)×3

(772×1,120×547)×2 (772×1,120×547)×3 (772×1,120×547)×3

3/4(19.05) 3/4(19.05) 3/4(19.05)

1-5/8(41.3) 1-5/8(41.3) 1-5/8(41.3)

PT40A + PT40A (Female)

PT40A + PT40A + PT32A (Female) PT40A + PT40A + PT40A (Female)

PT40A + PT40A (Female)

PT40A + PT40A + PT32A (Female) PT40A + PT40A + PT40A (Female)

3/4(22) (Female) 3/4(22) (Female) 3/4(22) (Female)

System Capacity HP(Ton)

Model Name

Product Refrigerant Charge lb(kg)

CF(Correction Factor) lb(kg)

Maximum Connectable No. of Indoor Units

Net Weight lb

Dimensions(WxHxD) inch

Refrigerant Liquid inch(mm)

Connecting Pipes Gas inch(mm)

Water Inlet mm

Connecting Pipes Outlet mm

Drain Outlet inch(mm)

10(8.0) 20(16.0) 30(24.0)

ARWN096DA2 ARWN192DA2 ARWN290DA2

16.1(7.3) 19.4(8.8) 19.4(8.8) + 16.1(7.3)

- - -

16 32 49

(374.8)×1 (524.7)×1 (524.7)×1 + (374.8)×1

(154)×1 (230)×1 (230)×1 + (154)×1

(30-13/32×44-3/32×21-1/2)×1 (30-13/32×44-3/32×21-1/2)×1 (30-13/32×44-3/32×21-1/2)×2

(772×1,120×547)×1 (772×1,120×547)×1 (772×1,120×547)×2

3/8(9.52) 1/2(12.7) 3/4(19.05)

7/8(22.2) 1-1/8(28.58) 1-3/8(34.9)

PT32A (Female) PT40A (Female)

PT40A + PT32A (Female)

PT32A (Female) PT40A (Female)

PT40A + PT32A (Female)

3/4(22) (Female) 3/4(22) (Female) 3/4(22) (Female)

System Capacity HP(Ton)

Model Name

Product Refrigerant Charge lb(kg)

CF(Correction Factor) lb(kg)

Maximum Connectable No. of Indoor Units

Net Weight lb

Dimensions(WxHxD) inch

Refrigerant Liquid inch(mm)

Connecting Pipes Gas inch(mm)

Water Inlet mm

Connecting Pipes Outlet mm

Drain Outlet inch(mm)

40(32.0) 50(40.0) 60(48.0)

ARWN390DA2 ARWN480DA2 ARWN580DA2

19.4(8.8) + 19.4(8.8)

19.4(8.8) + 19.4(8.8) + 16.1(7.3) 19.4(8.8) + 19.4(8 8) + 19.4(8.8)

- - -

64 64 64

(524.7)×2 (524.7)×2 + (374.8)×1 (524.7)×3

(230)×2 (230)×2 + (154)×1 (230)×3

(30-13/32×44-3/32×21-1/2)×2 (30-13/32×44-3/32×21-1/2)×3 (30-13/32×44-3/32×21-1/2)×3

(772×1,120×547)×2 (772×1,120×547)×3 (772×1,120×547)×3

3/4(19.05) 3/4(19.05) 3/4(19.05)

1-5/8(41.3) 1-5/8(41.3) 1-5/8(41.3)

PT40A + PT40A (Female)

PT40A + PT40A + PT32A (Female) PT40A + PT40A + PT40A (Female)

PT40A + PT40A (Female)

PT40A + PT40A + PT32A (Female) PT40A + PT40A + PT40A (Female)

3/4(22) (Female) 3/4(22) (Female) 3/4(22) (Female)

Environment-friendly Alternative Refrigerant R410A

10 Outside Unit

Select the Best Location

Select space for installing outside unit, which will meet the following conditions:

• No direct thermal radiation from other heat sources

• No possibility of annoying neighbors by noise from unit

• No exposition to strong wind

• With strength which bears weight of unit

• Note that drain flows out of unit when heating

• With space for air passage and service work shown next page.

• Because of the possibility of fire, do not install unit to the space where generation, inflow, stagnation, and

leakage of combustible gas is expected.

• Avoid unit installation in a place where acidic solution and spray (sulfur) are often used.

• Do not use unit under any special environment where oil, steam and sulfuric gas exist.

• It is recommended to fence round the outside unit in order to prevent any person or animal from accessing the

outside unit.

• This product is prohibited for outside installation.

• Select installation location considering following conditions to avoid bad condition when additionally performing

defrost operation.

1. Install the outside unit at a place well ventilated and having a lot of sunshine in case of installing the product

at a place with a high humidity in winter (near beach, coast, lake, etc).

(Ex) Rooftop where sunshine always shines.

2. Performance of heating will be reduced and preheat time of the indoor unit may be lengthened in case of

installing the outside unit in winter at following location:

(1) Shade position with a narrow space

(2) Location with high moisture level in neighboring floor.

(3) Location with high humidity around.

(4) Location where water gathers since the floor is not even.

• The refrigerant R410A has the property of higher operating pressure in comparison with R22.

Therefore, all materials have the characteristics of higher resisting pressure than R22 ones and this character-

istic should be also considered during the installation.

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

0. These days the developed countries have approved it as the environment-friendly refrigerant and encour-

aged to use it widely to prevent environment pollution.

Environment-friendly Alternative Refrigerant R410A

CAUTION:

• The wall thickness of the piping should comply with the relevant local and national regulations for the designed

pressure 3.8MPa

• Since R410A is a mixed refrigerant, 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 place the refrigerant container under the direct rays of the sun to prevent it from exploding.

• For high-pressure refrigerant, any unapproved pipe must not be used.

• Do not heat pipes more than necessary to prevent them from softening.

• Be careful not to install wrongly to minimize economic loss because it is expensive in comparison with R22.

Installation space

Installation Manual 11

ENGLISH

Installation space

Individual Installation

Collective / Continuous Installation

Required the minimum space as shown below for installation and

check. If the space is not fit on this drawing, consult with LG.

Space required for collective installation and continuous installation as shown below considering passage for air

and people.

: Service area

* In case of the water pipe passing side product, please make sufficient service place to avoid occurring

between water pipe and product side.

: Service area

20(3/4)

100(5-7/8)

350(13-25/32)

772(30-13/32)

H-Beam Support

[Unit: mm(inch)]

600(23-5/8)

547(21-17/32)

1,120(44-3/32)

100(5-7/8)

20(3/4)

Water pipe

installation

space

Product

(Outside unit)

Service area

(Front)

[Unit: mm(inch)]

350(13-25/32)

20(3/4)

350(13-25/32)

772(30-13/32) 772(30-13/32)

100(5-7/8) 100(5-7/8)

600(23-5/8)

547(21-17/32)

20(3/4)

Product

(Outside unit)

Service area

(Front)

Product

(Outside unit)

Service area

(Front)

[Unit: mm(inch)]

350(13-25/32)350(13-25/32)

100(5-7/8) 100(5-7/8)

772(30-13/32)

20(3/4)

772(30-13/32)

100(5-7/8)

350(13-25/32)

772(30-13/32)

600(23-5/8) 547(21-17/32)

20(3/4)

Product

(Outside unit)

Service area

(Front)

Product

(Outside unit)

Service area

(Front)

Product

(Outside unit)

Service area

(Front)

12 Outside Unit

Two Layer Installation

Space required for two layer installation as shown below considering passage for air and people.

: Service area

H-Beam Support

1,120(44-3/32)

100(5-7/8)

100

(5-7/8)

100(5-7/8)

[Unit: mm(inch)]

1,120(44-3/32)

100(5-7/8)

Installation space

Installation Manual 13

ENGLISH

Installation space

Water control

• Keep the water temperature between 10~45°C(50~113°F). Other it may cause the breakdown.

- Standard water supply temperature is 30°C(86°F) for Cooling and 20°C(68°F) for heating.

• Properly control the water velocity. Otherwise it may cause the noise, pipe vibration or pipe contraction, expansion

according to the temperature. Use the same water pipe size connected with the product or more.

• Refer to the water source pipe diameter and water velocity table below. As the water velocity is fast, air bubble will

increase.

• Be careful of the water purity control. Otherwise it may cause the breakdown due to water pipe corrosion.

(Refer to 'Standard Table for Water Purity Control')

• In case the water temperature is above 40°C(104°F), it is good to prevent the corrosion by adding the anticorrosive

agent.

• Install the pipe, valve and gauge sensor in the space where it is easy to maintain. Install the water valve in the low

position for drain, if required.

• Be careful not to let air in. If so, the water velocity will be unstable in the circulation, pump efficiency will also

decrease and may cause the piping vibration. Therefore, install the air purge where it may generate the air.

• Choose the following anti freezing methods. Otherwise, it will be dangerous for the pipe to break in the winter.

- Circulate the water with the pump before dropping the temperature.

- Keep the normal temperature by boiler.

- When the cooling tower is not operated for a long time, drain the water in the cooling tower.

- Use an anti-freeze. (For using an anti freeze, change the DIP switch on main PCB in outside unit.)

- Refer to the additive amount about freezing temperature as in the table given below.

• In addition to anti freeze, it may cause the change of the pressure in the water system and the low performance of

the product.

• Make sure to use the closed cooling type tower.

When applying the open type cooling tower, use a 2

heat exchanger to make the water supply system a closed

type system.

Diameter [mm(inch)] Velocity range (m/s)

< 50(1-31/32) 0.6 ~ 1.2

50(1-31/32) ~ 100(5-7/8) 1.2 ~ 2.1

100100(5-7/8) < 2.1 ~ 2.7

Minimum temperature for anti freezing [°C(°F)]

0 -5(23) -10(14) -15(5) -20(-4) -25

Ethylene glycol (%) 0 12 20 30 - -

Propylene glycol (%) 0 17 25 33 - -

Methanol (%) 0 6 12 16 24 30

Anti freeze type

14 Outside Unit

Standard table for water purity control

The water may contain many foreign substances and hence may influence the performance and lifetime of the prod-

uct due to the corrosion of the condenser and water pipe. (Use water source that complies with the below standard

table for water purity control.)

If you use water supply other than the tap water to supply the water for the cooling tower, you must do a water quality

inspection.

• If you use the closed cooling tower, the water quality must be controlled in accordance with the following standard

table.

If you do not control the water quality in accordance with the following standard water quality table, it can cause per-

formance deterioration to the air conditioner and severe problem to the product

[Reference]

(1) The "O" mark for corrosion and scale means that there is possibility of occurrence.

(2) When the water temperature is 40°C or above or when uncoated iron is exposed to the water, it can result in corro-

sion. Therefore adding anti-corrosion agent or removing the air can be very effective.

(3) In case of using the closed type cooling tower, the cooling water and supplementing water must satisfy the water qual-

ity criteria of closed type system in the table.

(4) Supplementing water and supplied water must be supplied with tap water, industrial water and underground water

excluding filtered water, neutral water, soft water etc.

(5) 15 items in the table are general causes of corrosion and scale.

Items

pH(25°C)

Conductivity[25°C](mS/m)

Chlorine ion(mg CI

/l)

Sulfuric acid ion(mg SO

/l)

Acid demand[pH 4.8] (mg SiO

2/l)

Total hardness(mg SiO

2/l)

Ca hardness(mg CaCO3/l)

Ion silica(mg SiO2/l)

Fe(mg Fe/l)

Copper(mg Cu/l)

Sulfuric acid ion(mg S

/l)

Ammonium ion(mg NH4/l)

Residual chlorine(mg Cl/l)

Free carbon dioxide(mg CO

2/l)

Stability index

7.0~8.0

Below 30

Below 50

Below 70

Below 50

Below 30

Below 1.0

Must not be detected

Below 0.3

Below 0.25

Below 0.4

Below 0.3

Below 0.1

Must not be detected

Below 0.1

Below 0.3

Below 4.0

7.0~8.0

Below 30

Below 50

Below 70

Below 50

Below 30

Closed type

Basic Item

Reference Item

Effect

Circulating water Supplemented water Corrosion Scale

Water control

Installation Manual 15

ENGLISH

Lifting method

• When carrying the suspended, unit pass the ropes under the unit and use the two suspension points each at

the front and rear.

• Always lift the unit with ropes attached at four points so that impact is not applied to the unit.

• Attach the ropes to the unit at an angle of 40° or less.

40 or less

Rope supporter

Sub line

CAUTION

Be very careful while carrying the product.

• Do not have only one person carry product if it is more than 20kg.

• PP bands are used to pack some products. Do not use them as a mean for transportation because they

are dangerous.

• Do not touch heat exchanger fins with your bare hands. Otherwise you may get a cut in your hands.

• Tear plastic packaging bag and scrap it so that children cannot play with it. Otherwise plastic packaging

bag may suffocate children to death.

• When carrying in Outside Unit, be sure to support it at four points. Carrying in and lifting with 3-point

support may make Outside Unit unstable, resulting in a fall.

• Use 2 belts of at least 8 m long.

• Place extra cloth or boards in the locations where the casing comes in contact with the sling to prevent

damage.

• Hoist the unit making sure it is being lifted at its center of gravity.

16 Outside Unit

Installation

Location of anchor bolt

The location of

anchor bolt

59(2-5/16)

50(2)

13(1/2)

599(23-19/32)

658(25-29/32)

[Unit: mm(inch)]

Installation

WARNING

• Be sure to install unit in a place strong enough to withstand its weight.

Any lack of strength may cause unit to fall down, resulting in a personal injury.

• Have installation work in order to protect against a strong wind and earthquake. Any installation

deficiency may cause unit to fall down, resulting in a personal injury.

• Especially take care for support strength of the floor surface, water drain processing (processing of

water flown out from the outside unit during operation) and paths of the pipe and wiring when mak-

ing a base support.

Installation Manual 17

ENGLISH

Installation

Preparation of Piping

1) Cut the pipes and the cable.

■ Use the accessory piping kit or the pipes purchased

locally.

■ Measure the distance between the indoor and the out-

side unit.

■ Cut the pipes a little longer than measured distance.

■ Cut the cable 1.5m longer than the pipe length.

2) Burrs removal

■ Completely remove all burrs from the cut cross section

of pipe/tube.

■ Put the end of the copper tube/pipe to downward direc-

tion as you remove burrs in order to avoid to let burrs

drop in the tubing.

3) Flaring work

■ Carry out flaring work using flaring tool as shown below.

Firmly hold copper tube in a bar(or die) as indicated

dimension in the table above.

4) Check

■ Compare the flared work with figure below.

■ If flare is noted to be defective, cut off the flared section

and do flaring work again.

Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.

Copper

tube

90°

Slanted Uneven Rough

Pipe

Reamer

Point down

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Inclined

Inside is shining without scratches.

Smooth all round

Even length

all round

Surface

damaged

Cracked Uneven

thickness

= Improper flaring =

[Unit: mm(inch)]

Pipe " A "

Gas Liquid Gas

Liquid

≤

5.6(19,100) 12.7(1/2) 6.35(1/4)

1.6~1.8 1.1~1.3

(0.63~0.71) (0.43~0.51)

<16.0(54,600) 15.88(5/8) 9.52(3/8)

1.6~1.8 1.5~1.7

(0.63~0.71) (0.59~0.67)

≤

22.4(76,400) 19.05(3/4) 9.52(3/8)

1.9~2.1 1.5~1.7

(0.75~0.83) (0.59~0.67)

Indoor unit

[kW(Btu/h]

18 Outside Unit

Installation

1. Remove the cap and turn the valve counter clockwise with the hexagon wrench.

2. Turn it until the shaft stops.

Do not apply excessive force to the shutoff valve. Doing so may break the valve body, as the valve is not a

backseat type. Always use the special tool.

3. Make sure to tighten the cap securely.

1. Remove the cap and turn the valve clockwise with the hexagon wrench.

2. Securely tighten the valve until the shaft contacts the main body seal.

3. Make sure to tighten the cap securely.

* For the tightening torque, refer to the table on the below.

Precautions when connecting pipes

• See the following table for flare part machining dimensions.

• When connecting the flare nuts, apply refrigerant oil to the inside and outside of the flares and turn them three

or four times at first. (Use ester oil or ether oil.)

• See the following table for tightening torque.(Applying too much torque may cause the flares to crack.)

• After all the piping has been connected, use nitrogen to perform a gas leak check.

Tightening torque

Union

CAUTION

• Always use a charge hose for service port connection.

• After tightening the cap, check that no refrigerant leaks are

present.

• When loosening a flare nut, always use two wrenches in

combination, When connecting the piping, always use a spanner

and torque wrench in combination to tighten the flare nut.

• When connecting a flare nut, coat the flare(inner and outer faces)

with oil for R410A(PVE) and hand tighten the nut 3 to 4 turns as

the initial tightening.

Opening shutoff valve

Closing shutoff valve

FLARE SHAPE and FLARE NUT TIGHTENING TORQUE

Shutoff

valve size

Ø6.4

Ø9.5

Ø12.7

Ø15.9

Ø22.2

Ø25.4

13.5-16.5

18-22

14-17

33-39

50-60

62-75

23-27

13.5-16.5

5.4-6.6

Hexagonal

wrench 4mm

Hexagonal

wrench 6mm

Hexagonal

wrench 10mm

8.1-9.9

27-33 36-44

11.5-13.9

22-28-

Tightening torque N-m(Turn clockwise to close)

Shaft(valve body)

Gas line piping attached to unit

Cap(Valve lid) Service port Flare nut

90°

±2

5°

R=0.4~0.8

pipe size tightening torque(Ncm) A(mm) flare shape

Ø9.5 3270-3990 12.8-13.2

Ø12.7 4950-6030 16.2-16.6

Ø15.9 6180-7540 19.3-19.7

Installation Manual 19

ENGLISH

Installation

1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over

120°C).

2. Precautions in high humidity circumstance:

This air conditioner has been tested according to the

"ISO Conditions with Mist" and confirmed that there is

not any default. However, if it is operated for a long

time in high humid atmosphere (dew point tempera-

ture: more than 23°C), water drops are liable to fall. In

this case, add heat insulation material according to the

following procedure:

• Heat insulation material to be prepared... EPDM

(Ethylene Propylene Diene Methylene)-over 120°C

the heat-resistance temperature.

• Add the insulation over 10mm thickness at high humidity environment.

Indoor unit

Thermal insulator

(accessory)

Fastening band

(accessory)

Refrigerant piping

HEAT INSULATION

20 Outside Unit

Refrigerant piping installation

WARNING

After completing work, securely tighten both service ports and caps so that gas does not leak.

Refrigerant piping installation

WARNING

Always use extreme care to prevent the refrigerant gas (R410A) from leakage while using fire or

flame. If the refrigerant gas comes in contact with the flame from any source, such as a gas stove, it

breaks down and generates a poisonous gas which can cause gas poisoning. Never perform brazing

in an unventilated room. Always conduct an inspection for gas leakage after installation of the refrig-

erant piping has been completed.

① Pipe joint (auxiliary parts): Securely perform brazing with

a nitrogen blow into the service valve port.(Releasing

pressure : 0.02 MPa or less)

② Flare nut: Loose or tighten flare nut by using the wrench

with both ends. Coat the flare connection part with oil for

the compressor.

③ Cap: Remove caps and operate valve, etc. After opera-

tion, always reattach caps (tightening torque of valve

cap: 25Nm (250kg-cm) or more). (Don't remove the

internal part of the port)

④ Service port: Make the refrigerant pipe vacuum and

charge it using the service port. Always reattach caps

after completing work (tightening torque of service cap:

14Nm (140kg-cm) or more).

⑤ Liquid pipe

⑥ Gas pipe

⑦ Elbow joint (field supply)

Cautions in pipe connection/valve operation

Open status when both the pipe and

the valve are in a straight line.

Cut both the pipe and the valve with a

cutter to suit the length

(Don't cut the length of less than 70mm)

CLOSE OPEN

Elbow

Ball Valve(Gas Pipe)

Ball Valve(Liquid Pipe)

Installation Manual 21

ENGLISH

Refrigerant piping installation

Slave

Outside Unit

Master

Outside Unit

Slave1

Outside

Unit

Slave2

Outside

Unit

Main

Outside Unit

1) For the high/low pressure common pipe, connect both master outside unit and slave outside units to the pipe by using

elbows.

2) For cutting the pipe, connect the high/low pressure common pipe after removing burrs, dusts and foreign material within

the pipe. Otherwise, the product may not operate due to sludge within the pipe.

3) For the working part leakage test, apply the nitrogen gas pressure of 3.8MPa (38.7kgf/cm

4) The vacuum criteria is to maintain the vacuum level to less than 5 Torr 1 hour after reaching 5 Torr. (Execute the vacuum

work again when it is below the criteria.)

5) Open the valve with the hexagon wrench.

Connecting

branch pipe

Combination specification Gas pipe Liquid pipe

Do not cut for

70mm or less

Execute the welding

while pouring

nitrogen

ARCNN20

[mm(inch)]

401(15-25/32)

331(13-1/32)

(31/32)

80(3-5/32)

73(2-7/8)

O.D12.7(1/2)

I.D12.7(1/2)

I.D9.52(3/8)

I.D15.88(5/8)

I.D19.05(3/4)

I.D22.2(7/8)

473(18-5/8)

363(14-9/32)

(1-1/2)

I.D28.58(1-1/8)

O.D28.58(1-1/8)

I.D28.58(1-1/8)

I.D19.05(3/4)

I.D15.88(5/8)

I.D31.8(1-1/4)

I.D34.9(1-3/8)

O.D34.9(1-3/8)

75(2-15/16) 83(3-9/32)

.D.I

115(4-17/32)

I.D22.2(7/8)

2 Outside Units 3 Outside Units

Connection of High/Low Pressure Common pipe

2 outside units

Connection of Outside units

22 Outside Unit

Refrigerant piping installation

3 Outside Units

Y branch

To outside unit

To branch piping or indoor unit

Facing

upwards

Facing

downwards

Within 3 Within 3

Viewed from point A

in direction of arrow

Within +/- 10

Connecting

branch pipe

Combination specification Gas pipe Liquid pipe

ARCNN20

ARCNN30

Don't cut the pipe less than

70mm

Blow nitrogen while

brazing

I.D38.1(1-1/2)

I.D34.9(1-3/8)

Don't cut the pipe less than

70mm

Blow nitrogen while

brazing

[mm(inch)]

401(15-25/32)

331(13-1/32)

(31/32)

80(3-5/32)

73(2-7/8)

O.D12.7(1/2)

I.D12.7(1/2)

I.D9.52(3/8)

O.D12.7(1/2)I.D9.52(3/8)

I.D9.52(3/8)

I.D15.88(5/8)

I.D19.05(3/4)

I.D22.2(7/8)

440(17-5/16)

370(14-9/16)

(25/32)

I.D

41.3(1-5/8)

397(15-5/8)

289(11-3/8)

(31/32)

473(18-5/8)

363(14-9/32)

(1-1/2)

I.D28.58(1-1/8)

O.D28.58(1-1/8)

I.D28.58(1-1/8)

I.D19.05(3/4)

I.D15.88(5/8)

I.D31.8(1-1/4)

I.D34.9(1-3/8)

O.D34.9(1-3/8)

I.D34.9(1-3/8)

75(2-15/16) 83(3-9/32)

115(4-17/32)

I.D22.2(7/8)

O.D28.58(1-1/8)

I.D19.05(3/4)

I.D22.2(7/8)

Installation Manual 23

ENGLISH

Refrigerant piping installation

1) Water pipe system diagram

• The water pressure resistance of the water pipe system of this product is 1.98MPa

• When the water pipe passes indoors, make sure to execute heat insulation on the pipe so that water drops do not form on

the outer side of the water pipe.

• The size of the drain pipe must be equal to or larger than the diameter of the connecting product.

- Always install a trap so that the drained water does not back flush.

• Always install a strainer (50Mesh or above) at the entrance of the water pipe. (When sand, trash, rusted pieces get mixed

into the water supply, it can cause problems to the product due to blocking)

- If On/Off valve is applied, by interlocking with outside unit, it can save the energy consumption of pump by blocking the

water supply to the outside unit not operating. Select appropriate valve and install on site if necessary.

• Install a pressure gauge and temperature gauge at the inlet and outlet of the water pipe.

• Flexible joints must be installed not to cause any leakage from the vibration of pipes.

• Install a service port to clean the heat exchanger at the each end of the water inlet and outlet.

• For the components of the water pipe system, always use components above the designed water pressure.

2) Water pipe connection

• The water pipe should be the same size of the connection on the product or more.

• If necessary install the insulation material in the water pipe inlet/outlet to prevent water drop, freeze and to save energy.

(Use the above 20mm thickness PE insulation material.)

• Tightly connect the socket to the water pipe refer to below table for recommended specification.

(Too much torque may cause the damage of the facility.)

Water pipe

outlet

Gate valve

Service port

Pressure gauge

Temperature gauge

Service port

Strainer

Drain line

Condensed

water drain

Water pipe

Inlet

Do not directly connect the drain outlet to the water pipe outlet.

(It can cause problems to the product.)

Installation of water pipe

24 Outside Unit

Water pipe

connection

Water pipe inlet

Water pipe outlet

mm inch (kN) (kgf) (kN) (kgf) (N

m) (kgf

m)(N

m) (kgf

12.7 1/2 3.5 350 2.5 250 20 2 35 3.5

19.05 3/4 12 1,200 2.5 250 20 2 115 11.5

25.4 1 1 1.2 1,120 4 400 45 4.5 155 15.5

31.8 1 1/4 14.5 1,450 6.5 650 87.5 8.75 265 26.5

38.1 1 1/2 16.5 1,700 9.5 950 155 16 350 35.5

50.8 2 21.5 2,200 13.5 1,400 255 26 600 61

Pipe thickness Shear stress Tensile stress Bending moment Torque

Refrigerant piping installation

Installation Manual 25

ENGLISH

Product protection device

Device protection unit

Strainer on water pipe

To protect the water cooling type product, you must install a strainer with 50 mesh or more on the heat water supply pipe.

If not installed, it can result in damage of heat exchanger by the following situation.

1. Heat water supply within the plate type heat exchanger is composed of multiple small paths.

2. If you do not use a strainer with 50 mesh or more, alien particles can partially block the water paths.

3. When running the heater, the plate type heat exchanger plays the role of the evaporator, and at this time, the temperature of the

coolant side drops to drop the temperature of the heat water supply, which can result in icing point in the water paths.

4. And as the heating process progresses, the water paths can be partially frozen to lead to damage in plate type heat exchanger.

5. As a result of the damage of the heat exchanger from the freezing, the coolant side and the heat water source side will be mixed

to make the product unusable.

Upper graph is a theoretical value for selection and it may be different according to specification of strainer.

Heat Source

(Water)

Refrigerant

1. Pollution of

Heat source

2. Partially frozen 3. Damage

: Suggestion range

: Allowed range

Head loss of strainer on water pipe

ARWN096DA2 ARWN192DA2

Installation of flow switch

• The flow switch must be installed at the horizontal pipe of the heat water supply outlet of the product and check the direc-

tion of the heat water flow before the installation. (Picture 1)

• When connecting the flow switch to the product, remove the jump wire to connect to the communication terminal (4(A) and

4(B)) of the outside unit control box. (Picture 2, 3) (Open the cover of the flow switch and check the wiring diagram before

connecting the wires. The wiring method can differ by the manufacturer of the flow switch.)

• If necessary, adjust the flow rate detection screw after consulting with an expert and adjust to the minimum flow rate

range. (Picture 4) (Minimum flow rate range of this product is 50%. Adjust the flow switch to touch the contact point when

the flow rate reaches 50% of the flow rate.)

- Reference flow rate : 8HP – 21 GPM, 16HP – 42 GPM

10HP – 25 GPM, 20HP – 50 GPM

Picture 1

Picture 4

Picture 3

3(B) 4(A) 4(B)

Picture 2

Product protection device

26 Outside Unit

Flow switch work

• It is recommended to install the flow switch to the water collection pipe system

connecting to the outside unit.

(Flow switch acts as the 1st protection device when the heat water is not sup-

plied. If a certain level of water does not flow after installing the flow switch, an

error sign of CH24 error will be displayed on the product and the product will stop

operating.)

• When setting the flow switch, it is recommended to use the product with default

set value to satisfy the minimum flow rate of this product. (The minimum flow rate

range of this product is 50%. Reference flow rate : 8HP - 21 GPM, 16HP - 42

GPM)

• Select the flow switch with the permitted pressure specification considering the

pressure specification of the heat water supply system. (Control signal from out-

side unit is AC 220V.)

1 inch or

3/4 inch

socket

Cover

Micro-switch

Adjustment screw

Vibration plate

Bellows

Pad

• If the set value does not satisfy the minimum flow rate or if the set value is changed by the user arbitrarily, it can result

in product performance deterioration or serious product problem.

• If the product is operated with the heat water supply not flowing smoothly, it can damage the heat exchanger or cause

serious product problems.

• In case of CH24 or CH180 error, there is a possibility that the plate type heat exchanger is partially frozen inside. In this

case resolve the issue of partial freezing and then operate the product again. (Cause of partial freezing : Insufficient

heat water flow rate, water not supplied, insufficient coolant, alien particle penetrated inside plate type heat exchanger)

• When the product operates while the flow switch touches the contact point at the flow rate range out of the permitted

range, it can cause product performance deterioration or serious product problem.

• Must use the normal closed type flow switch - Circuit of outside unit is normal closed type

Installation Manual 27

ENGLISH

Refrigerant piping system

Y branch method

➲ Refrigerant pipe diameter from

branch to branch (B,C,D)

➲ Total pipe length =

A+B+C+D+a+b+c+d+e ≤ 300m(984ft)

(500m(1640ft)*)

➲ Outside unit

Ⓐ

~ 1st branch

Ⓑ

Main pipe diameter (A)

L Below 150m(492ft)

Below H 50m(164ft)

Below 40m(131ft)

Below 15m(49ft)

Indoor unit

direction

1. When installing 1 outside unit

independently

Ex) 5 indoor units connected

Ⓐ : Outside unit

Ⓑ : 1st branch (Y branch)

Ⓓ : Indoor unit

For the first branch pipe (B), use the branch pipe

that fits the main pipe diameter (A).

(**) : Conditional application

Outside unit

Liquid pipe Gas pipe

capacity

[mm(inch)] [mm(inch)]

8 HP Ø9.52(3/8) Ø22.2(7/8)

10 HP Ø9.52(3/8) Ø22.2(7/8)

16 HP Ø12.7(1/2) Ø28.58(1-1/8)

20 HP Ø12.7(1/2) Ø28.58(1-1/8)

Total capacity of indoor units connected

to after branching [kW(Btu/h]

≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)

<16(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

< 33(112,600) Ø9.52(3/8) Ø22.2(7/8)

< 47(160,400) Ø12.7(1/2) Ø28.58(1-1/8)

< 71(242,300) Ø15.88(5/8) Ø28.58(1-1/8)

< 104(354,900) Ø19.05(3/4) Ø34.9(1-3/8)

104(354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8)

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

Longest pipe length Equivalent pipe length

A + B + C + D + e ≤ 150m(492ft)(200m(656ft)**) *A + B + C + D + e ≤ 175m(574ft)(225m(738ft)**)

Longest pipe length after 1st branching

B + C + D + e ≤ 40m(131ft) (90m(295ft)**)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤ 50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤ 15m(49ft)

ℓ

• When the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe

diameter (B) after 1st branching that is the same as the main pipe diameter (A).

Ex) When connecting with 120% of the indoor unit to 10 HP

1) Outside unit main pipe diameter: Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8)(Liquid pipe)

2) Pipe diameter after 1st branching by 120% indoor unit combination : Ø28.58(1-1/8) (Gas pipe) / Ø12.7(1/2) (Liquid pipe)

Therefore set the pipe diameter (B) after 1st branching to Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8) (Liquid pipe) of main pipe diameter (A).

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m(295ft) or above, you must change the

main pipe diameter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and

gas pipes.)

Gas Pipe Liquid Pipe

8, 10 HP .........................................................................Ø22.2(7/8) → Ø25.4(1) 8, 10 HP.........................................................................Ø9.52(3/8) → Ø12.7(1/2)

16, 20 HP .......................................................................Ø28.58(1-1/8) → Ø31.8(1-1/4) 16, 20 HP.......................................................................Ø12.7(1/2) → Ø15.88(5/8)

28 Outside Unit

low

(6.6ft)

Master

Slave

Indoor unit

direction

Below 10m

L Below 150m(492ft)

Below H 50m(164ft)

Below 40m(131ft)

Below 15m(49ft)

➲

Slave outside unit ~ Connecting

branch pipe

Ⓔ

: Pipe diameter

between outside units

(E)

➲

Connecting branch pipe

Ⓔ

~ 1st

branch part

Ⓑ

: Main pipe diameter (A)

➲

Refrigerant pipe diameter from branch

to branch (B, C, D)

➲

Total refrigerant pipe length =

A + B + C + D + a + b + c + d + e ≤ 300m(984ft)

(500m(1640ft)*)

2. When installing 2 outside units

Ex) 5 indoor units connected

Ⓐ : Outside units

Ⓑ : 1st branch

Ⓓ : Indoor unit direction

Ⓔ : Connecting branch pipe between out-

side units

❈ Connecting branch pipe between outside

units: ARRCN20(ⓔ)

For the first branch pipe (B), use the branch pipe

that fits the main pipe diameter (A).

Refrigerant piping system

Liquid pipe Gas pipe

Low/high pressure

[mm(inch)] [mm(inch)]

common pipe

Ø9.52(3/8)/12.7(1/2)

Ø22.2(7/8)/28.58(1-1/8)

Ø19.05(3/4)

Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]

24,30HP Ø19.05(3/4) Ø34.9(1-3/8)

32,40HP Ø19.05(3/4) Ø41.3(1-5/8)

Longest pipe length Equivalent pipe length

A + B + C + D + e ≤ 150m(492ft)(200m(656ft)**) *A + B + C + D + e ≤ 175m(574ft)(225m(738ft)**)

Longest pipe length after 1st branching

B + C + D + e ≤ 40m(131ft) (90m(295ft)**)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤ 50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤15m(49ft)

High/Low difference (Outside unit ↔ Outside unit)

h ≤ 2m(6.6ft)

ℓ

Total capacity of indoor units connected

to after branching [kW(Btu/h]

≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)

<16(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

< 33(112,600) Ø9.52(3/8) Ø22.2(7/8)

< 47(160,400) Ø12.7(1/2) Ø28.58(1-1/8)

< 71(242,300) Ø15.88(5/8) Ø28.58(1-1/8)

< 104(354,900) Ø19.05(3/4) Ø34.9(1-3/8)

104(354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8)

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

• When

the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe diameter (B)

after 1st branching that is the same as the main pipe diameter (A).

Ex) When connecting with 120% of the indoor unit to 10 HP.

1) Outside unit main pipe diameter: Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8)(Liquid pipe)

2) Pipe diameter after 1st branching by 120% indoor unit combination : Ø28.58(1-1/8) (Gas pipe) / Ø12.7(1/2) (Liquid pipe)

Therefore set the pipe diameter (B) after 1st branching to Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8)(Liquid pipe) of main pipe diameter (A).

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m or above, you must change the main pipe diame-

ter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and gas pipes.)

Gas Pipe Liquid Pipe

24,30HP..................................................................Ø37.9 → Ø38.1(1-1/2) 24,30,32,40HP

...................................................Ø

19.05(

3/4) → Ø22.2(7/8)

32,40HP............................................................Ø41.3(1-5/8)

(**) : Conditional application

Installation Manual 29

ENGLISH

Refrigerant piping system

10m or

less

L150m(492ft)

40m(131ft)

Slave2

Slave1

Master

elow

(6.6ft)

(h1)

Indoor unit

direction

H 50m(164ft)

15m(49ft)

3. When installing 3 outside units

Ex) 5 Indoor Units connected

Ⓐ : Outside Units

Ⓑ : 1st branch (Y branch)

Ⓓ : Downward Indoor Unit

Ⓔ : Connection branch pipe between

Outside units:ARCNN30

Ⓕ : Connection branch pipe between

Outside units:ARCNN20

➲

Slave1 outside unit ~ Connecting

branch pipe

Ⓔ

: Pipe diameter

between outside units (E)

➲

Connecting branch pipe

Ⓔ

~ 1st branch

part

Ⓑ

: Main pipe diameter (A)

➲

Refrigerant pipe diameter from branch

to branch (B, C, D)

➲

Total refrigerant pipe length = A + B + C + D +

a + b + c + d + e ≤ 300m(984ft)(500m(1640ft)*)

For the first branch pipe (B), use the branch

pipe that fits the main pipe diameter (A).

➲

Slave2 outside unit ~ Connecting

branch pipe

Ⓕ

: Pipe diameter

between outside units (F)

• When

the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe diameter (B)

after 1st branching that is the same as the main pipe diameter (A).

Ex) When connecting with 120% of the indoor unit to 10 HP.

1) Outside unit main pipe diameter: Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8)(Liquid pipe)

2) Pipe diameter after 1st branching by 120% indoor unit combination : Ø28.58(1-1/8) (Gas pipe) / Ø12.7(1/2) (Liquid pipe)

Therefore set the pipe diameter (B) after 1st branching to Ø22.2(7/8) (Gas pipe) / Ø9.52(3/8)(Liquid pipe) of main pipe diameter (A).

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m or above, you must change the main pipe diame-

ter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and gas pipes.)

Gas Pipe Liquid Pipe

40,48,50,60HP ............................................Ø41.3(1-5/8) 40,48,50,60HP ............................................Ø19.05(3/4) → Ø22.2(7/8)

Liquid pipe Gas pipe

Low/high pressure

[mm(inch)] [mm(inch)]

common pipe

Ø9.52(3/8)/12.7(1/2)

Ø22.2(7/8)/28.58(1-1/8)

Ø19.05(3/4)

Liquid pipe Gas pipe Low/high pressure

[mm(inch)] [mm(inch)] common pipe

Ø15.88(5/8)/19.05(3/4)

Ø34.9(1-3/8)/41.3(1-5/8)

Ø19.05(3/4)

Longest pipe length Equivalent pipe length

A + B + C + D + e ≤ 150m(492ft)(200m(656ft)**) *A + B + C + D + e ≤ 175m(574ft)(225m(738ft)**)

Longest pipe length after 1st branching

B + C + D + e ≤ 40m(131ft) (90m(295ft)**)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤ 50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤ 15m(49ft)

High/Low difference (Outside unit ↔ Outside unit)

h ≤ 2m(6.6ft)

ℓ

Outside unit capacity

Liquid pipe[mm(inch)] Gas pipe [mm(inch)]

40,48,50,60HP Ø19.05(3/4) Ø41.3(1-5/8)

Total capacity of indoor units connected

to after branching [kW(Btu/h]

≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)

<16(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

< 33(112,600) Ø9.52(3/8) Ø22.2(7/8)

< 47(160,400) Ø12.7(1/2) Ø28.58(1-1/8)

< 71(242,300) Ø15.88(5/8) Ø28.58(1-1/8)

< 104(354,900) Ø19.05(3/4) Ø34.9(1-3/8)

104(354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8)

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

(**) : Conditional application

30 Outside Unit

Header branch method

L Below 150m(492ft)

Below H 50m(164ft)

l Below 40m(131ft)

Below 15m(49ft)

➲

Total refrigerant pipe length = A +a +b +c +d +e +f ≤ 300m(984ft)(500m(1640ft)*)

1. When installing 1 outside unit indepen-

dently

Ex) 6 indoor units connected

Ⓐ Outside unit

Ⓑ Header branch

Ⓓ Seal

• For the pipe length after the header branch (a~f), it is recommended to install the unit so that the difference of the pipe

distance connected to the indoor unit is minimized.

• The large difference in pipe distance can cause performance difference between indoor units.

• After the header branch, you cannot use the Y branch and header branch.

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m(295ft) or above, you must

change the main pipe diameter according to the outside unit capacity in accordance with the following table.

(This applies to both the liquid and gas pipes.)

➲

Outside unit

Ⓐ

~ Header branch

part

Ⓑ

: Main pipe diameter (A)

Gas Pipe Liquid Pipe

Refrigerant piping system

Outside unit

Liquid pipe Gas pipe

capacity

[mm(inch)] [mm(inch)]

8 HP Ø9.52(3/8) Ø22.2(7/8)

10 HP Ø9.52(3/8) Ø22.2(7/8)

16 HP Ø12.7(1/2) Ø28.58(1-1/8)

20 HP Ø12.7(1/2) Ø28.58(1-1/8)

Longest pipe length (Equivalent pipe length)

A +f ≤ 150m(492ft)( 175m(574ft))

Longest pipe length after 1st branching

f ≤ 40m(131ft)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤ 50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤ 15m(49ft)

ℓ

Installation Manual 31

ENGLISH

Refrigerant piping system

Master

Slave

L Below 150m(492ft)

H Below 50m(164ft)

l Below 40m(131ft)

Below 15m(49ft)

Below 10m

Below 2m(6.6ft)

➲

Slave outside unit ~ Connecting

branch unit

Ⓔ

: Pipe diameter

between outside units (E)

➲

Connecting branch pipe

Ⓔ

~ Header branch part

Ⓑ

: Main pipe diameter (A)

2. When installing 2 outside units

Ex) 6 indoor units connected

Ⓐ : Outside unit

Ⓑ : Header branch

Ⓓ : Seal

Ⓔ : Connecting branch pipe between out-

side units

❈ Connecting branch pipe between outside

units: ARRCN20(Ⓔ)

• For the pipe length after the header branch (a~f), it is recommended to install the unit so that the difference of the pipe dis-

tance connected to the indoor unit is minimized.

• The large difference in pipe distance can cause performance difference between indoor units.

• After the header branch, you cannot use the Y branch and header branch.

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is

90m(295ft)

or above, you must

change the main pipe diameter according to the outside unit capacity in accordance with the following table. (This applies

to both the liquid and gas pipes.)

➲

Total refrigerant pipe length = A + B + C + D + a + b + c + d + e ≤ 300m(984ft)(500m(1640ft)*)

Liquid pipe Gas pipe

Low/high pressure

[mm(inch)] [mm(inch)]

common pipe

Ø9.52(3/8)/12.7(1/2)

Ø22.2(7/8)/28.58(1-1/8)

Ø19.05(3/4)

Longest pipe length (Equivalent pipe length)

A +f ≤ 150m(492ft)(175m(574ft))

Longest pipe length after 1st branching

f ≤ 40m(131ft)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤ 50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤ 15m(49ft)

High/Low difference (Outside unit ↔ Outside unit)

h1 ≤ 2m(6.6ft)

ℓ

Gas Pipe Liquid Pipe

24,30HP..................................................................Ø37.9 → Ø38.1(1-1/2) 24,30,32,40HP........................................................

19.05

(3/4) → Ø22.2(7/8)

32,40HP............................................................Ø41.3(1-5/8)

Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]

24,30HP Ø19.05(3/4) Ø34.9(1-3/8)

32,40HP Ø19.05(3/4) Ø41.3(1-5/8)

32 Outside Unit

Branch pipe can not be used after header

3. When installing 3 outside units

Ex)

6 Indoor Units connected

Ⓐ : Outside Units

Ⓑ : Header branch

Ⓓ : Sealing

Ⓔ : Connection branch pipe between

Outside units:ARCNN30

Ⓕ : Connection branch pipe between

Outside units:ARCNN20

10m or

less

H Below 50m(164ft)

Master

Slave2

Slave1

L150m(492ft)

l 40m(131ft)

Below 2m

(h1)

Below 2m(6.6ft)

(h1)

Below 15m(49ft)

➲

Slave1 outside unit ~ Connecting

branch unit

Ⓔ

: Pipe diameter

between outside units (E)

➲

Connecting branch pipe

Ⓔ

~ Header branch

part

Ⓑ

: Main pipe diameter (A)

➲

Slave2 outside unit ~ Connecting

branch pipe

Ⓕ

: Pipe diameter

between outside units (F)

Refrigerant piping system

Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]

40,48,50,60HP Ø19.05(3/4) Ø41.3(1-5/8)

• For the pipe length after the header branch (a~f), it is recommended to install the unit so that the difference of the pipe distance connected to

the indoor unit is minimized.

• The large difference in pipe distance can cause performance difference between indoor units.

• After the header branch, you cannot use the Y branch and header branch.

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m or above, you must change the main pipe diame-

ter according to the outside unit capacity in accordance with the following table. (This applies to both the liquid and gas pipes.)

Liquid pipe Gas pipe Low/high pressure

[mm(inch)] [mm(inch)] common pipe

Ø15.88(5/8)/19.05(3/4)

Ø34.9(1-3/8)/41.3(1-5/8)

Ø19.05(3/4)

➲

Total refrigerant pipe length = A + B + C + D + a + b + c + d + e ≤

300m(984ft)(500m(1640ft)*)

Longest pipe length (Equivalent pipe length)

A +f ≤ 150m(492ft)( 175m(574ft))

Longest pipe length after 1st branching

f ≤ 40m(131ft)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤ 50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤ 15m(49ft)

High/Low difference (Outside unit ↔ Outside unit)

h1 ≤ 2m(6.6ft)

ℓ

Gas Pipe Liquid Pipe

40,48,50,60HP ............................................Ø41.3(1-5/8) 40,48,50,60HP ............................................Ø19.05(3/4) → Ø22.2(7/8)

Liquid pipe Gas pipe

Low/high pressure

[mm(inch)] [mm(inch)]

common pipe

Ø9.52(3/8)/12.7(1/2)

Ø22.2(7/8)/28.58(1-1/8)

Ø19.05(3/4)

Installation Manual 33

ENGLISH

Refrigerant piping system

Y/Header branch method

➲ Outside unit

Ⓐ

~ 1st Y branch

part

Ⓑ

: Main pipe diameter (A)

L Below 150m(492ft)

Below H 50m(164ft)

l Below 40m(131ft)

h Below 15m(49ft)

1. When installing 1 outside unit indepen-

dently

Ex) 5 indoor units connected

Ⓐ : Outside unit

Ⓑ : 1st Y branch

Ⓓ : Indoor unit

Ⓔ : Header branch

Ⓕ : Seal

* For the first branch pipe (B), use the branch pipe

that fits the main pipe diameter (A)

➲ Refrigerant pipe diameter from branch

to branch (B, C)

➲ Total pipe length = A +B +C +a +b +c

+d +e ≤ 300m(984ft)(500m(1640ft)*)

• When the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe diameter (B)

after 1st branching that is the same as the main pipe diameter (A). Ex) When connecting with 120% of the indoor unit to 10 HP.

1) Outside unit main pipe diameter:

22.2(7/8) (Gas pipe) /

9.52(3/8) (Liquid pipe)

2) Pipe diameter after 1st branching by 120% indoor unit combination :

28.58(1-1/8) (Gas pipe) /

12.7(1/2) (Liquid pipe)

Therefore set the pipe diameter (B) after 1st branching to

22.2(7/8) (Gas pipe) /

9.52(3/8) (Liquid pipe) of main pipe diameter (A).

• For the pipe length after the header branch (c~e), it is recommended to install the unit so that the difference of the pipe distance connected to

the indoor unit is minimized.

• The large difference in pipe distance can cause performance difference between indoor units.

• After the header branch, you cannot use the Y branch and header branch.

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m(295ft) or above, you must change the main pipe

diameter according to the outside unit capacity in accordance with the following table.

(This applies to both the liquid and gas pipes.)

Total capacity of indoor units con-

nected to after branching[kW(Btu/h]

≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)

<16(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

< 33(112,600) Ø9.52(3/8) Ø22.2(7/8)

< 47(160,400) Ø12.7(1/2) Ø28.58(1-1/8)

< 71(242,300) Ø15.88(5/8) Ø28.58(1-1/8)

< 104(354,900) Ø19.05(3/4) Ø34.9(1-3/8)

104(354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8)

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

Longest pipe length (Equivalent pipe length)

A +B +b,A +C +e ≤ 150m(492ft)( 175m(574ft))

Longest pipe length after 1st branching

B +b,C +e ≤ 40m(131ft)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤

50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤ 15m(49ft)

ℓ

Outside unit

Liquid pipe Gas pipe

capacity

[mm(inch)] [mm(inch)]

8 HP Ø9.52(3/8) Ø22.2(7/8)

10 HP Ø9.52(3/8) Ø22.2(7/8)

16 HP Ø12.7(1/2) Ø28.58(1-1/8)

20 HP Ø12.7(1/2) Ø28.58(1-1/8)

Gas Pipe Liquid Pipe

34 Outside Unit

Master

Slave

L Below 150m(492ft)

H Below 50m(164ft)

h Below

15m(49ft)

Below 10m

Below 2m(6.6ft)

l Below 40m(131ft)

➲

Slave outside unit ~ Connecting

branch pipe Ⓖ : Pipe diameter

between outside units (E)

➲

Connecting branch pipe

Ⓖ

~ 1st Y

branch part

Ⓑ

: Main pipe diameter (A)

➲

Refrigerant pipe diameter from branch

to branch (B, C)

➲

Total refrigerant pipe length = A + B + C + a

+ b + c + d + e ≤

300m(984ft)(500m(1640ft)*)

2. When installing 2 outside units

Ex) 5 indoor units connected

Ⓐ : Outside units

Ⓑ : 1st Y branch

Ⓓ : Indoor unit

Ⓔ : Header branch

Ⓕ : Seal

Ⓖ : Connecting branch pipe between outside units

❈ Connecting branch pipe between outside units:

ARRCN20(Ⓖ)

• When the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe diameter

(B) after 1st branching that is the same as the main pipe diameter (A). Ex) When connecting with 120% of the indoor unit to 10 HP.

1) Outside unit main pipe diameter:

22.2(7/8) (Gas pipe) /

9.52(3/8) (Liquid pipe)

2) Pipe diameter after 1st branching by 120% indoor unit combination :

28.58(1-1/8) (Gas pipe) /

12.7(1/2) (Liquid pipe)

Therefore set the pipe diameter (B) after 1st branching to

22.2(7/8) (Gas pipe) /

9.52(3/8) (Liquid pipe) of main pipe diameter (A).

• For the pipe length after the header branch (c~e), it is recommended to install the unit so that the difference of the pipe distance connected

to the indoor unit is minimized.

• The large difference in pipe distance can cause performance difference between indoor units.

• After the header branch, you cannot use the Y branch and header branch.

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m(295ft) or above, you must change the main

pipe diameter according to the outside unit capacity in accordance with the following table.

(This applies to both the liquid and gas pipes.)

Refrigerant piping system

For the first branch pipe (B), use the branch pipe

that fits the main pipe diameter (A).

Total capacity of indoor units con-

nected to after branching[kW(Btu/h]

≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)

<16(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

< 33(112,600) Ø9.52(3/8) Ø22.2(7/8)

< 47(160,400) Ø12.7(1/2) Ø28.58(1-1/8)

< 71(242,300) Ø15.88(5/8) Ø28.58(1-1/8)

< 104(354,900) Ø19.05(3/4) Ø34.9(1-3/8)

104(354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8)

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]

24,30HP Ø19.05(3/4) Ø34.9(1-3/8)

32,40HP Ø19.05(3/4) Ø41.3(1-5/8)

Longest pipe length (Equivalent pipe length)

A +f ≤ 150m(492ft)( 175m(574ft))

Longest pipe length after 1st branching

f ≤ 40m(131ft)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤ 50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤ 15m(49ft)

High/Low difference (Outside unit ↔ Outside unit)

h1 ≤ 2m(6.6ft)

ℓ

Liquid pipe Gas pipe

Low/high pressure

[mm(inch)] [mm(inch)]

common pipe

Ø9.52(3/8)/12.7(1/2)

Ø22.2(7/8)/28.58(1-1/8)

Ø19.05(3/4)

Gas Pipe Liquid Pipe

24,30HP..................................................................Ø37.9 → Ø38.1(1-1/2) 24,30,32,40HP........................................................

19.05

(3/4) → Ø22.2(7/8)

32,40HP............................................................Ø41.3(1-5/8)

Installation Manual 35

ENGLISH

Refrigerant piping system

Branch pipe can not be used after header

3. When installing 3 outside units

Ex) 5 Indoor Units connected

Ⓐ : Outside Units

Ⓑ : 1st branch(Y branch)

Ⓓ : Indoor Unit

Ⓔ :

Connection branch pipe between Outside

units:ARCNN30

Ⓕ :

Connection branch pipe between Outside

units:ARCNN20

Ⓖ : Header

Ⓗ : Sealing

Master

Slave2

Slave1

10m or

less

L150m(492ft)

l40m(131ft)

Below 2m

(h1)

Below 2m(6.6ft)

(h1)

H Below 50m(164ft)

h 15m(49ft)

➲

Slave1 outside unit ~ Connecting

branch pipe

Ⓔ

: Pipe diameter

between outside units (E)

➲

Connecting branch pipe

Ⓔ

~ 1st Y

branch part

Ⓑ

: Main pipe diameter (A)

➲

Refrigerant pipe diameter from branch

to branch (B, C)

➲

Total refrigerant pipe length = A + B + C +

a + b + c + d + e ≤

00m(984ft)(500m(1640ft)*)

For the first branch pipe (B), use the branch pipe

that fits the main pipe diameter (A).

➲

Slave2 outside unit ~ Connecting

branch pipe

Ⓕ

: Pipe diameter

between outside units (F)

Total capacity of indoor units con-

nected to after branching[kW(Btu/h]

≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)

<16(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

< 33(112,600) Ø9.52(3/8) Ø22.2(7/8)

< 47(160,400) Ø12.7(1/2) Ø28.58(1-1/8)

< 71(242,300) Ø15.88(5/8) Ø28.58(1-1/8)

< 104(354,900) Ø19.05(3/4) Ø34.9(1-3/8)

104(354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8)

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

Outside unit capacity Liquid pipe[mm(inch)] Gas pipe [mm(inch)]

40,48,50,60HP Ø19.05(3/4) Ø41.3(1-5/8)

Longest pipe length (Equivalent pipe length)

A +B +b,A +C +e ≤ 150m(492ft)( 175m(574ft))

Longest pipe length after 1st branching

B +b,C +e ≤ 40m(131ft)

High/Low difference (Outside unit ↔ Indoor unit)

H ≤ 50m(164ft)

High/Low difference (Indoor unit ↔ Indoor unit)

h ≤ 15m(49ft)

High/Low difference (Outside unit ↔ Outside unit)

h ≤ 2m(6.6ft)

ℓ

Liquid pipe Gas pipe Low/high pressure

[mm(inch)] [mm(inch)] common pipe

Ø15.88(5/8)/19.05(3/4)

Ø34.9(1-3/8)/41.3(1-5/8)

Ø19.05(3/4)

Liquid pipe Gas pipe

Low/high pressure

[mm(inch)] [mm(inch)]

common pipe

Ø9.52(3/8)/12.7(1/2)

Ø22.2(7/8)/28.58(1-1/8)

Ø19.05(3/4)

36 Outside Unit

‘ Indoor unit connecting pipe from branch (a~f)

‘ Equivalent piping length for Y Branch and other pipes can be calculated with following table.

Indoor unit capacity [kW(Btu/h)]

≤ 5.6(19,100)

< 16.0(54,600)

< 22.4(76,400)

< 33(112,600)

Ø6.35(1/4)

Ø9.52(3/8)

Ø12.7(1/2)

Ø15.88(5/8)

Ø19.05(3/4)

Ø22.2(7/8)

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

• When the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe

diameter (B) after 1st branching that is the same as the main pipe diameter (A). Ex) When connecting with 120% of the indoor unit to

10 HP.

1) Outside unit main pipe diameter:

22.2(7/8) (Gas pipe) /

9.52(3/8) (Liquid pipe)

2) Pipe diameter after 1st branching by 120% indoor unit combination :

28.58(1-1/8) (Gas pipe) /

12.7(1/2) (Liquid pipe)

Therefore set the pipe diameter (B) after 1st branching to

22.2(7/8) (Gas pipe) /

9.52(3/8) (Liquid pipe) of main pipe diameter (A).

• For the pipe length after the header branch (c~e), it is recommended to install the unit so that the difference of the pipe distance con-

nected to the indoor unit is minimized.

• The large difference in pipe distance can cause performance difference between indoor units.

• After the header branch, you cannot use the Y branch and header branch.

• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m(295ft) or above, you must change the

main pipe diameter according to the outside unit capacity in accordance with the following table.

(This applies to both the liquid and gas pipes.)

Piping length from outdoor branch to outdoor unit ≤ 10m(32.8ft), equivalent length : max 13m(42.7ft) (for 18HP)

Conditional Application

To satisfy below condition to mak 40m ~ 90m(131ft ~ 295ft) of pipe length after first branch.

1) Diameter of pipes between first branch and the last branch should be increased by one step,

except pipe diameter B,C,D is same as Diameter A

Ø6.35(1/4 inch) ’ Ø9.52(3/8 inch) ’ Ø12.7(1/2 inch) ’ Ø15.88(5/8 inch) ’ Ø19.05(3/4 inch) ’ Ø22.2(7/8 inch) ’ Ø25.4*(1 inch),

Ø28.58(1-1/8 inch) ’ Ø31.8*(1-1/4 inch), Ø34.9(1-3/8 inch) ’ Ø38.1*(1-1/2 inch)

* : It is not necessary to size up.

If available on site, it use this size. Otherwise it can't be increased.

2) Length of pipe from each indoor unit to the closest branch (a,b,c,d,e,e) ≤ 40m(131ft)

3) [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)]

• [Length of pipe outdoor unit to the closest indoor unit 1 (A+a)] ≤ 40m(131ft)

Indoor unit connection

Note

Refrigerant piping system

Gas Pipe Liquid Pipe

40,48,50,60HP ............................................Ø41.3(1-5/8) 40,48,50,60HP ............................................Ø19.05(3/4) ’ Ø22.2(7/8)

Pipe

Ø6.35 Ø9.52 Ø12.7 Ø15.88 Ø19.05 Ø22.2 Ø25.4 Ø28.58 Ø31.8 Ø34.9 Ø38.1 Ø41.3 Ø44.5 Ø53.98

(1/4") (3/8") (1/2") (5/8") (3/4") (7/8") (1") (1 1/8") (1 1/4") (1 3/8") (1 1/2") (1 5/8") (1 3/4") (2 1/8")

Elbow

0.16 m 0.18 m 0.2 m 0.25 m 0.35 m 0.4 m 0.45 m 0.5 m 0.55 m 0.6 m 0.65 m 0.7 m 0.75 m 0.85 m

(0.53 ft) (0.59 ft) (0.66 ft) (0.82 ft) (1.15 ft) (1.31 ft) (1.48 ft) (1.64 ft) (1.80 ft) (1.97 ft) (2.13 ft) (2.30 ft) (2.46 ft) (2.79 ft)

Y Branch 0.5 m(1.64 ft)

Header 1.0 m(3.28 ft)

Installation Manual 37

ENGLISH

Refrigerant piping system

Oil trap application method between outside units

• Because of the possibility of oil being accumulated in the outside unit that has stopped, when there is a height difference between

outside unit pipes or if the pipe distance between the outside units is over 2m(6.6ft), you must always apply an oil trap. (But, the oil

trap between outside units is limited to 1 time and is only applied to the gas pipe.)

• If the pipe distance between the outside units is 2m(6.6ft) or below, and if the location of the main pipe is lower than that of the out-

side unit and if the location of the main pipe is lower than that of the outside unit, the oil trap does not have to be applied.

• If the location of the main pipe is higher than the location of the outside unit, be careful since the oil can be accumulated in the

stopped outside unit.

• If there is high/low difference between the outside unit pipes, oil can be accumulated to the outside unit on the lower location until

the unit stops.

High/Low difference

between the outside units

High/Low difference

between outside units pipes

High/Low difference

between outside units pipes

Location of

main pipe

Location of

outside units

Location of main pipe

Location of

main pipe

Location of

main pipe

Location of main pipe

Location of

outside units

Oil trap

2m(6.6ft) or less

Over

0.2m(0.7ft)

Over 2m(6.6ft)

Oil is accumulated on the

outside unit because it can-

not be poured out from the

bottom of the pipe.

Because the oil flow to the right pipe, oil gets accumulated on

the outside unit on the lower side until the outside unit stops.

• When pipe distance between the outside

units is 2m(6.6ft) or less

• Example of incorrect installation

• When pipe distance between the outside

units exceed 2m(6.6ft)

• Example of correct installation

38 Outside Unit

Calculation of amount of refrigerant

Refrigerant piping system

The calculation of the additional charge should take into account the length of pipe.

Product Charge(kg(lbs))

Additional charge (kg(lbs))

x 0.237 lbs/ft

x 0.178 lbs/ft

x 0.116 lbs/ft

x 0.079 lbs/ft

x 0.041 lbs/ft

x 0.015 lbs/ft

CF(kg(lbs))

(Correction Factor)

If a negative result is obtained from

the calculation, no refrigerant needs

to be added.

A B

CAUTION

Total liquid pipe (m(ft)): Ø22.2mm(7/8inch)

Total liquid pipe (m(ft)): Ø19.05mm(3/4inch)

Total liquid pipe (m(ft)): Ø15.88mm(5/8inch)

Total liquid pipe (m(ft)): Ø12.7mm(1/2inch)

Total liquid pipe (m(ft)): Ø9.52mm(3/8inch)

Total liquid pipe (m(ft)): Ø6.35mm(1/4inch)

Total amount(kg(lbs))

Outside unit

Header branch

Indoor unit

Ex) 10HP

Additional Charge = A x 0.041 + B x 0.041 + C x 0.041

+ D x 0.041 + E x 0.015 + HR + CF

= 164 x 0.041 + 33 x 0.041 + 33 x 0.041

+ 33 x 0.041 + 33 x 0.015 + 0(CF)

= 11.3lbs(5.1kg)

A : Ø9.52(3/8), 50m(164ft)

B : Ø9.52(3/8), 10m(33ft)

C : Ø9.52(3/8), 10m(33ft)

D : Ø9.52(3/8), 10m(33ft)

E : Ø 6.35(1/4), 10m(33ft)

u Special condition 1

In case of the No. of CST TQ/RAC SE/ARTCOOL SF models are over than 50% of the connected

indoor units when the total No. of connected indoor units are over than 50% of the max. connectable

indoor units.

n Additional refrigerant charging amount (kg(lbs)) : Ⓒ

= (A x

α+ B x ß) - (AVG x ß)

• A = Total No. of TQ, SE and SF Indoor units,

α= 0.5

• B = Total No. of except TQ, SE and SF Indoor units, ß = 0.3

• AVG = 50% of Max. No. of connectable Indoor units.

Example)

1) Installation Information

- Outside unit : 10HP

- Total indoor units : 6 units (TQ 3 units, SE 2 units, BH 1 unit)

2) Information from PDB

- Max. No. of connectable indoor units : 16 units

- Calculated additional refrigerant amount = 2kg (4.41lbs) : Ⓑ

3) Indoor refrigerant charging amount

= (5 units x 0.5+1 unit x 0.3) - (8 units x 0.3) = 0.4 kg(0.88lbs) : Ⓒ

▶ Revised the total additional charging amount = Ⓑ + Ⓒ = 2kg (4.41lbs) + 0.4 kg(0.88lbs)

= 2.4 kg(5.29lbs)

Total amount(kg)

Installation Manual 39

ENGLISH

Refrigerant piping system

▶ Regulation for refrigerant leakage

: the amount of refrigerant leakage should satisfy the following equation for human safety.

p If the above equation can not be satisfied, then follow the following steps.

- Selection of air conditioning system: select one of the next

1. Installation of effective opening part

2. Reconfirmation of Outside Unit capacity and piping length

3. Reduction of the amount of refrigerant

4. Installation of 2 or more security device (alarm for gas leakage)

- Change Indoor Unit type

: installation position should be over 2m(6.6ft) from the floor (Wall mounted type ’ Cassette type)

- Adoption of ventilation system

: choose ordinary ventilation system or building ventilation system

- Limitation in piping work

: Prepare for earthquake and thermal stress

Total amount of refrigerant in the system

≤ 0.44 (kg / m

)(0. 028(lb/ft

))

Volume of the room at which Indoor Unit of the least capacity is installed

Note:

Fill in the f-gas Label attached on outside with the quantity of the fluorinated greenhouse gases

① Manufacturing site (See Model Name label)

② Installation site (If possible being placed adjacent to the service points for the addition or removal of

refrigerant)

③ The total Charge (①+②)

▶

Refer to model information since the CF Value of correction factor differs depending on model.

u Special condition 2

Add 0.27 lb(0.12 kg) of refrigerant per indoor units while using the below mentioned models.

ARNU093TN*2/ARNU123TN*2/ARNU153TN*2/ARNU183TM*2/ARNU243TM*2

40 Outside Unit

Refrigerant piping system

To Outside Unit

Sealed Piping

1. Use the following materials for refrigerant piping.

• Material: Seamless phosphorous deoxidized copper pipe

• Wall thickness : Comply with the relevant local and national regulations for the designed pressure

3.8MPa. We recommend the following table as the minimum wall thickness.

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

gas.

3. Use carefully to prevent dust, water or other contaminants from entering the piping during installation.

4. Reduce the number of bending portions as much as possible, and make bending radius as big as possible.

5. Always use the branch piping set shown below, which are sold separately.

6. If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut

the connecting section and then use an adapter for connecting different diameters to connect the piping.

7. Always observe the restrictions on the refrigerant piping (such as rated length, difference in height, and

piping diameter).

Failure to do so can result in equipment failure or a decline in heating/cooling performance.

8. A second branch cannot be made after a header. (These are shown by .)

9. The Multi V will stop due to an abnormality like excessive or insufficient refrigerant. At such a time, always

properly charge the unit. When servicing, always check the notes concerning both the piping length and

the amount of additional refrigerant.

10. Never perform a pump down. This will not only damage the compressor but also deteriorate the

performance.

11. Never use refrigerant to perform an air purge. Always evacuate using a vacuum pump.

Caution

ARBLN01621 ARBLN03321 ARBL054 ARBL057 ARBL1010

ARBLN07121 ARBLN14521 ARBL104 ARBL107 ARBL2010

Y branch

Header

4 branch 7 branch 10 branch

Outer diameter

[mm(inch)]

Minimum thickness

[mm(inch)]

6.35

(1/4)

9.52

(3/8)

12.7

(1/2)

15.88

(5/8)

19.05

(3/4)

22.2

(7/8)

25.4

(1)

28.58

(1-1/8)

31.8

(1-1/4)

34.9

(1-3/8)

38.1

(1-1/2)

41.3

(1-15/16)

0.8

(0.03)

0.8

(0.03)

0.8

(0.03)

0.99

(3.25)

0.99

(0.04)

0.99

(0.04)

0.99

(0.04)

0.99

(0.04)

1.1

(0.04)

1.21

(0.05)

1.35

(0.05)

1.43

(0.06)

Installation Manual 41

ENGLISH

Refrigerant piping system

Branch pipe Fitting

Y branch

To Outside Unit

To Branch Piping or Indoor Unit

Facing

upwards

Facing

downwards

Within ± 3° Within ± 3°

Viewed from point A

in direction of arrow

Horizontal

plane

Within +/- 10°

Insulator

(included with kit)

Liquid and gas

pipe joints

Insulator for

field piping

Tape

(field supply)

Header

To outside unit

To indoor unit

• Ensure that the branch pipes are attached horizontally or vertically (see the diagram below.)

• There is no limitation on the joint mounting configuration.

• If the diameter of the refrigerant piping selected by the procedures described is different from the size

of the joint, the connecting section should be cut with a pipe cutter.

• Branch pipe should be insulated with the insulator in each kit.

• When the number of pipes to be connected is

smaller than the number of header branches,

install a cap to the unconnected branches.

• The indoor unit having larger capacity must be

installed closer to Ⓐ than smaller one.

• If the diameter of the refrigerant piping selected

by the procedures described is different from

the size of the joint,

the connecting section

should be cut with a pipe cutter.

42 Outside Unit

Refrigerant piping system

• When the number of indoor units to be connected to the branch pipes is less than the number of branch

pipes available for connection then cap pipes should be fitted to the surplus branches.

• Fit branch pipe lie in a horizontal plane.

• Header should be insulated with the insulator in each kit.

• Joints between branch and pipe should be sealed with the tape included in each kit.

• Any cap pipe should be insulated using the insulator provided with each kit and then taped as described

above.

Pinched pipe

Horizontal plane

View from point B in the direction of the arrow

Insulate the header using

the insulation

material attached to the

branch pipe kit

as shown in the figure.

Insulator

Insulator of field pipe

Tape

Cap pipe

Insulator for cap pipe

Installation Manual 43

ENGLISH

Refrigerant piping system

Thermal insulation of refrigerant piping

Heat

insulation

material

Outer

covering

Adhesive + Heat - resistant polyethylene foam +

Adhesive tape

Indoor Vinyl tape

Floor exposed

Water-proof hemp cloth + Bronze asphalt

Outside

Water-proof hemp cloth + Zinc plate + Oily paint

Note:

When using polyethylene cover as covering material, asphalt roof-

ing shall not be required.

• Do not insulate gas or low pressure pipe and liquid or high

pressure pipe together.

• Be sure to fully insulate connecting portion.

Liquid pipe

Gas pipe

Power lines

Finishing tape

Insulating material

Bad example

Good example

These parts are not insulated.

B A C

Transmission lines

Liquid pipe

Transmission lines

Separation

Gas pipe

Power lines

Insulating material

Heat insulation material

Pipe

Outer covering

(Wind the connection part and cutting part of

heat insulation material with a finishing tape.)

Power lines

Be sure to give insulation work to refrigerant piping by covering liquid pipe and gas pipe separately with

enough thickness heat-resistant polyethylene, so that no gap is observed in the joint between indoor unit

and insulating material, and insulating materials themselves. When insulation work is insufficient, there is a

possibility of condensation drip, etc. Pay special attention to insulation work to ceiling plenum.

1m1m

Inner wall (concealed)

Floor (fireproofing)

Penetrating portion on fire

limit and boundary wall

Roof pipe shaft

Outer wall Outer wall (exposed)

Penetrations

Sleeve

Heat insulating material

Lagging

Caulking material

Band

Waterproofing layer

Sleeve with edge

Lagging material

Mortar or other incombustible caulking

Incombustible heat insulation material

When filling a gap with mortar, cover the

penetration part with steel plate so that

the insulation material will not be caved in.

For this part, use incombustible materials

for both insulation and covering.(Vinyl

covering should not be used.)

44 Outside Unit

Y branch pipe and header branch pipe type

Y branch pipe

Y branch pipe and header branch pipe type

Models Gas pipe Liquid pipe

[unit:mm(inch)]

ARBLN03321

ARBLN07121

ARBLN14521

ARBLN01621

413(16-1/4)

390(15-11/32)

I.D19.05(3/4)

O.D15.88(5/8)

I.D12.7(1/2)

I.D15.88(5/8)

I.D12.7(1/2)

I.D12.7

(1/2)

I.D12.7

(1/2)

I.D12.7(1/2)

292(11-1/2)

281(11-1/16)

292(11-1/2)

281(11-1/16)

(2-29/32)

70(2-3/4)

I.D15.88(5/8)

I.D25.4(1)

O.D25.4(1)

80(3-5/32)

110(4-11/32)

471(18-17/32)

517(20-11/32)

125

(4-29/32)

(3-9/32)

130(5-1/8)

I.D15.88(5/8)

I.D41.3(1-5/8)

I.D41.3

(1-5/8)

I.D41.3(1-5/8)

I.D38.1(1-1/2)

O.D38.1(1-1/2)

O.D15.88(5/8)

376(14-13/16)

404(15-29/32)

)23/32-4(021)23/32-4(021

120(4-23/32)

90(3-17/32)

I.D15.88(5/8)

I.D19.05(3/4)

O.D19.05(3/4)

(3-25/32)

I.D22.2(7/8)

O.D22.2(7/8)

I.D22.2(7/8)

I.D6.35(1/4)

I.D34.9(1-3/8)

O.D34.9(1-3/8)

I.D28.58(1-1/8)

O.D28.58(1-1/8)

I.D28.58(1-1/8)

O.D31.8(1-1/4)

I.D31.8(1-1/4)

I.D9.52(3/8)

O.D9.52(3/8)

I.D12.7(1/2)

(2-29/32)

332(13-1/16)

321(12-5/8)

I.D6.35(1/4)

I.D9.52(3/8)

I.D15.88(5/8)

I.D12.7(1/2)

O.D12.7(1/2)

70(2-3/4)

110(4-11/32)

371(14-19/32)

394(15-1/2)

(3-9/32)

I.D19.05(3/4)

I.D6.35(1/4)

I.D9.52(3/8)

I.D12.7(1/2)

O.D12.7(1/2)

I.D12.7

(1/2)

110(4-11/32)110(4-11/32)

41616-3/8)

444(17-15/32)

O.D15.88(5/8)

I.D15.88(5/8)

I.D19.05(3/4)

I.D15.88(5/8)

I.D19.05(3/4)

O.D19.05(3/4)

80(3-5/32)

2 33

(3-25/32)

I.D22.2(7/8)

I.D6.35(1/4)

I.D9.52(3/8)

Installation Manual 45

ENGLISH

Y branch pipe and header branch pipe type

Header

[unit:mm(inch)]

Models Gas pipe Liquid pipe

4 branch

ARBL054

7 branch

ARBL057

4 branch

ARBL104

7 branch

ARBL107

10 branch

ARBL1010

10 branch

ARBL2010

360(14-5/32)

540(21-1/4)

120(4-23/32)

ID15.88(5/8)

ID12.7(1/2)

ID15.88(5/8)

ID19.05(3/4)

120(4-23/32)

360(14-5/32)

ID9.52(3/8)

ID6.35(1/4)

ID9.52(3/8)

ID12.7(1/2)

150

(5-29/32)

150

(5-29/32)

150

(5-29/32)

150

(5-29/32)

150

(5-29/32)

400(15-23/32)

160(6-5/16)

ID15.88(5/8)ID15.88(5/8)

ID12.7(1/2)ID12.7(1/2)

ID15.88(5/8)

ID12.7(1/2)

ID19.05(3/4)

ID15.88(5/8)

ID22.2(7/8)

ID28.58(1-1/8)

ID25.4(1)

120

(4-23/32)

120

(4-23/32)

120

(4-23/32)

120

(4-23/32)

120

(4-23/32)

120

(4-23/32)

120

(4-23/32)

120

(4-23/32)

120

(4-23/32)

120(4-23/32)

ID15.88(5/8)

ID12.7(1/2)

ID15.88(5/8)

ID12.7(1/2)

ID15.88(5/8)

ID19.05(3/4)

120(4-23/32)

ID6.35(1/4)

ID9.52(3/8)

ID12.7(1/2)

160(6-5/16)

580(22-27/32)

ID19.05(3/4)

ID15.88(5/8)

ID15.88(5/8)ID15.88(5/8)

ID12.7(1/2)ID12.7(1/2)

ID15.88(5/8)

ID12.7(1/2)

ID22.2(7/8)

ID28.58(1-1/8)

ID25.4(1)

700(27-9/16)

120(4-23/32)

ID6.35(1/4)

ID9.52(3/8)

ID9.52(3/8)ID9.52(3/8)

ID6.35(1/4)ID6.35(1/4)

ID9.52(3/8)

ID6.35(1/4)

ID9.52(3/8)ID12.7(1/2)

ID15.88(5/8)

ID12.7(1/2)

120(4-23/32)

720(28-11/32)

ID6.35(1/4)

ID9.52(3/8)

ID6.35(1/4)

ID12.7(1/2)

ID9.52(3/8)

107(4-7/32)

60*9=540(21-1/2)

700(27-9/16)

ID6.35(1/4)

ID9.52(3/8)

ID19.05(3/4)

ID15.88(5/8)

ID9.52(3/8)

ID6.35(1/4)

ID9.52(3/8)

ID6.35(1/4)

120

(4-23/32)

120

(4-23/32)

160(6-5/16)

760(29-28/32)

ID19.05(3/4)

ID15.88(5/8)

ID22.2(7/8)

ID28.58(1-1/8)

ID25.4(1)

182(7-5/32)

775(30-17/32)

ID19.05(3/4)

ID15.88(5/8)

ID12.7(1/2)

ID28.58(1-1/8)

ID31.8(1-1/4)

ID34.9(1-3/8)

150

(5-29/32)

150

(5-29/32)

150

(5-29/32)

150

(5-29/32)

150

(5-29/32)

150

(5-29/32)

150

(5-29/32)

120(4-23/32)

120

(4-23/32)

360(14-5/32)

ID9.52(3/8)

ID6.35(1/4)

ID9.52(3/8)

ID12.7(1/2)

46 Outside Unit

Leakage test and vacuum

Leak test

Indoor unit

Nitrogen gas

Outside unit

Close Close

Liquide pipe

Gas pipe

Liquid side

Gas side

Indoor unit

Nitrogen gas

Liquid side

Gas side

1unit

2Units, 3Units

High/low pressure

common pipe

High/low pressure

common pipe

High/low pressure

common pipe

Slave Unit

Master Unit

Leak test should be m

ade by pressurizing nitrogen gas to 3.8 MPa(38.7kgf/cm

). If the pressure does not drop for 24

hours, the system passes the test. If the pressure drops, check where the nitrogen leaks. For the test method, refer to

the following figure. (Make a test with the service valves closed. Be also sure to pressurize liquid pipe, gas pipe and

high/low pressure common pipe). The test result can be judged good if the pressure has not be reduced after leaving

for about one day after completion of nitrogen gas pressurization.

Note:

If the ambient temperature differs between the time when pressure is applied and when the pressure drop is

checked, apply the following correction factor

There is a pressure change of approximately 0.1 kg/cm

(0.01 MPa) for each 1°C of temperature difference.

Correction= (Temp. at the time of pressurization – Temp. at the time of check) X 0.1

For example: Temperature at the time of pressurization (3.8 MPa) is 27 °C

24 hour later: 3.73 MPa, 20°C

In this case the pressure drop of 0.07 is because of temperature drop

And hence there is no leakage in pipe occurred.

To prevent the nitrogen from entering the refrigeration system in the liquid state, the top of the

cylinder must be at higher position than the bottom when you pressurize the system.

Usually the cylinder is used in a vertical standing position.

Y branch pipe and header branch pipe type

Installation Manual 47

ENGLISH

Leakage test and vacuum

Vacuum

Vacuum drying should be made from the service port provided on the outside unit’s service valve to the vacuum

pump commonly used for liquid pipe, gas pipe and high/low pressure common pipe. (Make Vacuum from liquid

pipe, gas pipe and high/low pressure common pipe with the service valve closed.)

* Never perform air purging using refrigerant.

• Vacuum drying: Use a vacuum pump that can evacuate to -100.7kPa (5 Torr, -755mmHg).

1. Evacuate the system from the liquid and gas pipes with a vacuum pump for over 2 hrs and bring the system

to -100.7kPa.

After maintaining system under that condition for over 1 hr, confirm the vacuum gauge rises. The system may

contain moisture or leak.

2. Following should be executed if there is a possibility of moisture remaining inside the pipe.

(Rainwater may enter the pipe during work in the rainy season or over a long period of time)

After evacuating the system for 2 hrs, give pressure to the system to 0.05MPa(vacuum break) with nitrogen

gas and then evacuate it again with the vacuum pump for 1hr to -100.7kPa(vacuum drying). If the system

cannot be evacuated to -100.7kPa within 2 hrs, repeat the steps of vacuum break and its drying.

Finally, check if the vacuum gauge does not rise or not, after maintaining the system in vacuum for 1 hr.

Vacuum pump

Indoor unit

Outside unit

High/low pressure

common pipe

Liquide pipe

Gas pipe

Liquid side

Gas side

Scale

Use a graviometer. (One that can measure

down to 0.1kg). If you are unable to prepare

such a high-precision gravimeter you may

use a charge cylinder.

• Vacuum should be done for 3 hours or more

after the pressure is under 0.5 torr.

Vacuum pump

Indoor unit

Liquid side

Gas side

1Unit

2Units, 3Units

Slave Unit

High/low pressure

common pipe

Liquide pipe

Gas pipe

Master Unit

High/low pressure

common pipe

Liquide pipe

Gas pipe

Note : Always add an appropriate amount of refrigerant. (For the refrigerant additional charge)

Too much or too little refrigerant will cause trouble.

To use the Vacuum Mode

(If the Vacuum mode is set, all valves of Indoor units and Outside units will be opened.)

When installing and moving the air conditioner to another site, recharge after perfect evacuation.

- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and

the unit may be damaged.

48 Outside Unit

Electrical Wiring

Remote

control

Remote

control

Remote

control

Remote

control

Indoor

Unit

Outside Unit Outside Unit

Outside Unit

Indoor

Unit

Remote

control

Remote

control

Indoor

Unit

Indoor

Unit

Remote

control

Remote

control

Indoor

Unit

Indoor

Unit

Indoor

Unit

Indoor

Unit

2-core shield cable Multi-core cable

1. Follow ordinance of your governmental organization for technical standard related to electrical equipment,

wiring regulations and guidance of each electric power company.

2. Install the Outside Unit transmission line away from the power source wiring so that it is not affected by elec-

tric noise from the power source. (Do not run it through the same conduit.)

3. Be sure to provide designated grounding work to Outside Unit.

4. Give some allowance to wiring for electrical part box of Indoor and Outside Units, because the box is some-

times removed at the time of service work.

5. Never connect the main power source to terminal block of transmission line. If connected, electrical parts will

be burnt out.

6. Use 2-core shield cable for transmission line.(O mark in the figure below) If transmission lines of different sys-

tems are wired with the same multiplecore cable, the resultant poor transmitting and receiving will cause erro-

neous operations. ( mark in the figure below)

7. Only the transmission line specified should be connected to the terminal block for Outside Unit transmission.

Be sure to have authorized electrical engineers do the electric work using special circuits in

accordance with regulations and this installation manual. If power supply circuit has a lack of

capacity or electric work deficiency, it may cause an electric shock or fire.

Be sure to correct the outside unit to earth. Do not connect earth line to any gas pipe, water pipe,

lightening rod or telephone earth line. If earth is incomplete, it may cause an electric shock.

Installation Manual 49

ENGLISH

Electrical Wiring

Master Slave1 Slave2

Remote

controller

Remote

controller

Indoor

Unit

Indoor

Unit

Remote

controller

Outside Unit

Remote

controller

Indoor

Unit

Indoor

Unit

Remote

controller

Remote

controller

Indoor

Unit

Indoor

Unit

Remote

controller

Remote

controller

Indoor

Unit

Indoor

Unit

2-Core Shield Cable Multi-Core Cable

When none are available, follow the instructions below.

• Do not connect wiring of different thicknesses to the power terminal block. (Slack in the power wiring

may cause abnormal heat.)

• When connecting wiring which is the same thickness, do as shown in the figure below.

• For wiring, use the designated power wire and connect firmly, then secure to prevent outside pressure

being exerted on the terminal block.

• Use an appropriate screwdriver for tightening the terminal screws. A screwdriver with a small head will

strip the head and make proper tightening impossible.

• Over-tightening the terminal screws may break them.

◆ Precautions when laying power wiring

Round pressure terminal

Power wire

Use round pressure terminals for connections to the power terminal block.

• Use the 2-core shield cables for transmission lines. Never use them together with power cables.

• The conductive shielding layer of cable should be grounded to the metal part of both units.

• Never use multi-core cable

• As this unit is equipped with an inverter, to install a phase leading capacitor not only will deteriorate

power factor improvement effect, but also may cause capacitor abnormal heating. Therefore, never

install a phase leading capacitor.

• Make sure that the power unbalance ratio is not greater than 2%. If it is greater the units lifespan will

be reduced.

50 Outside Unit

Electrical Wiring

- Unscrew all the screw, pull out the panel.

- Connect the transmission wire between outside unit and indoor unit,

the connection between outside unit and central controller system

pass through the sub PCB for central control.

- When connecting indoor unit with the shield cable, ground at the

grounding screw.

When connecting central controller with the shield cable, ground at

the grounding screw.

- Refer to next page about the distance between main power cable

and communication cable.

Front Panel

Control Box and Wiring Location

Installation Manual 51

ENGLISH

Electrical Wiring

Transmission and Power Lines

1) Transmission cable

• Types : shielding wire

• Diameter : over 1.25mm

• Maximum allowable temperature: 60°C(140°F)

• Maximum allowable line length: under 300 m(984ft)

2) Remote control cable

• Types : 3-core cable

3) Simple central control cable

• Types : 4-core cable (Shielding wire)

• Use wires of size : 1.0 ~ 1.5 mm

• Insulation material : PVC

4) Separation of transmission and power lines

• If transmission and power lines are run alongside each other then there is a strong likelihood of operational

faults developing due to interference in the signal wiring caused by electrostatic and electromagnetic cou-

pling.

The tables below indicates our recommendation as to appropriate spacing of transmission and power lines

where these are to be run side by side

Note:

1. The figures are based on assumed length of parallel cabling up to 100m. For length in excess of 100m

the figures will have to be recalculated in direct proportion to the additional length of line involved.

2. If the power supply waveform continues to exhibit some distortion the recommended spacing in the

table should be increased.

• If the lines are laid inside conduits then the following point must also be taken into account when grouping

various lines together for introduction into the conduits

• Power lines(including power supply to air conditioner) and signal lines must not be laid inside the same

• In the same way, when grouping the lines power and signal lines should not be bunched together.

Current capacity of power line Spacing

10A 300mm(11-13/16 inch)

50A 500mm(19-11/16 inch)

100A 1,000mm(39-3/8 inch)

Exceed 100A 1,500mm(59-1/16 inch)

100V or more

If apparatus is not properly earthed then there is always a risk of electric shocks, the earthing of the

apparatus must be carried out by a qualified person.

52 Outside Unit

Electrical Wiring

1. Use a separate power supply for the Outside Unit and Indoor Unit.

2. Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceed-

ing with the wiring and connections.

3. The wire size is the minimum value for metal conduit wiring. The power cord size should be 1 rank

thicker taking into account the line voltage drops. Make sure the power-supply voltage does not drop

more than 10%.

4. Specific wiring requirements should adhere to the wiring regulations of the region.

5. Power supply cords of parts of appliances for outside use should not be lighter than polychloroprene

sheathed flexible cord.

6. Do not install an individual switch or electrical outlet to disconnect each of indoor unit separately from

the power supply.

◆ Wiring of Main Power Supply and Equipment Capacity

• Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring reg-

ulations and guidance of each electric power company.

• Make sure to use specified wires for connections so that no external force is imparted to terminal connections. If con-

nections are not fixed firmly, it may cause heating or fire.

• Make sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include

some amount of direct current.

• Some installation site may require attachment of an earth leakage breaker. If no earth leakage breaker is installed, it may

cause an electric shock.

• Do not use anything other than breaker and fuse with correct capacity. Using fuse and wire or copper wire with too large

capacity may cause a malfunction of unit or fire.

Installation Manual 53

ENGLISH

Electrical Wiring

1. 60Hz

34 34 34

The GND terminal is a '–' terminal for the central controller, not Ground Line

Between Indoor and Master Outside unit

IDUSODU DRY1 DRY2 GND

INTERNET

BABA

12V

Master

Outside unit

3 Phase 3 Wires

Power supply

60Hz 208/230V

Power supply

1 Phase 60Hz

208/230V

3 Phase 3 Wires Power line(L1, L2, L3)

Transmission line (3 line): Wired remote control

Single Phase of power supply line(L, N)

Transmission line (2 shield line): Between Indoor Unit and Outside Unit

Power supply switch

(Switch fuse : ELCB)

Power supply switch

(Switch)

(Main Switch)

Pull Box(Installer option)

◆ Example Connection of Transmission Cable

1 Outside Unit

WARNING

• Indoor Unit ground Lines are required for preventing electrical shock accident during current leakage,

Transmission disorder by noise effect and motor current leakage (without connection to pipe).

• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from

the power supply.

• Install the main switch that can interrupt all the power sources in an integrated manner because this

system consists of the equipment utilizing the multiple power sources.

• If there exists the possibility of reversed phase, lose phase, momentary blackout or the power goes on

and off while the product is operating, attach a reversed phase protection circuit locally.

Running the product in reversed phase may break the compressor and other parts.

54 Outside Unit

Electrical Wiring

Power supply switch

(Switch fuse : ELCB)

Power supply switch

(Switch)

Power supply switch

(Switch)

3 Phase 3 Wires Power line(L1, L2, L3)

Transmission line (3 line): Wired remote control

Single Phase of power supply line(L, N)

Transmission line (2 shield line):

Between Outside Unit and Outside Unit

Transmission line (2 shield line):

Between Indoor Unit and Outside Unit

3 Phase 3 Wires

Power supply

60Hz 208/230V

Power supply

1 Phase 60Hz

208/230V

The GND terminal is a '–' terminal for the central controller, not Ground Line

• Make sure that terminal number of master and slave outside unit are matched.(A-A,B-B)

Slave

Master

Between Indoor and Master Outside unit

Slave

Outside

unit

Power supply switch

(Switch fuse : ELCB)

■ When the power source is supplied to

Each outside unit individually.

3 Phase 3 Wires

Power supply

60Hz 208/230V

Power supply

1 Phase 60Hz

208/230V

■ When the power source is connected

In series between the units.

(Main Switch)

IDUSODU DRY1 DRY2 GND

INTERNET

12V

Master

Outside

unit

IDUSODU DRY1 DRY2 GND

INTERNET

12V

IDUSODU DRY1 DRY2 GND

INTERNET

12V

Master

Outside

unit

Pull Box(Installer option)

◆ Example Connection of Transmission Cable

2 Outside Units

WARNING

• Indoor Unit ground Lines are required for preventing electrical shock accident during current leakage,

Transmission disorder by noise effect and motor current leakage (without connection to pipe).

• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from the power supply.

• Install the main switch that can interrupt all the power sources in an integrated manner because this system consists of the

equipment utilizing the multiple power sources.

• If there exists the possibility of reversed phase, lose phase, momentary blackout or the power goes on and off while the prod-

uct is operating, attach a reversed phase protection circuit locally.

Running the product in reversed phase may break the compressor and other parts.

Installation Manual 55

ENGLISH

Electrical Wiring

Power supply switch

(Switch fuse : ELCB)

3 Phase 3 Wires Power line(L1, L2, L3)

Transmission line (3 line): Wired remote control

Single Phase of power supply line(L,N)

Transmission line (2 shield line):

Between Outside Unit and Outside Unit

Power supply switch

(Switch)

Power supply switch

(Switch)

3 Phase 3 Wires

Power supply

60Hz 208/230V

Power supply

1 Phase 60Hz

208/230V

Master

Slave2

Slave1

Transmission line (2 shield line):

Between Indoor Unit and Outside Unit

Power supply switch

(Switch fuse : ELCB)

3 Phase 3 Wires

Power supply

60Hz 208/230V

Power supply

1 Phase 60Hz

208/230V

■ When the power source is supplied to

Each outside unit individually.

■ When the power source is connected

In series between the units.

(Main Switch)

The GND terminal is a '–' terminal for the

central controller, not Ground Line

Between Indoor and Master

Outside

unit

Slave1

Outside

unit

Master

Outside

unit

Slave2

Outside

unit

IDUSODU DRY1 DRY2 GND

INTERNET

12V

IDUSODU DRY1 DRY2 GND

INTERNET

12V

IDUSODU DRY1 DRY2 GND

INTERNET

12V

IDUSODU DRY1 DRY2 GND

INTERNET

12V

Master

Outside

unit

Pull Box(Installer option)

◆ Example Connection of Transmission Cable

3 Outside Units

WARNING

• Indoor Unit ground Lines are required for preventing electrical shock accident during current leakage,

Transmission disorder by noise effect and motor current leakage (without connection to pipe).

• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from the power supply.

• Install the main switch that can interrupt all the power sources in an integrated manner because this system consists of the

equipment utilizing the multiple power sources.

• If there exists the possibility of reversed phase, lose phase, momentary blackout or the power goes on and off while the

product is operating, attach a reversed phase protection circuit locally.

Running the product in reversed phase may break the compressor and other parts.

56 Outside Unit

Electrical Wiring

◆ Example Connection of Communication Cable

[BUS type]

• Connection of communication cable must be installed like below figure between indoor unit to outside unit.

[STAR type]

• Abnormal operation can be caused by communication defect, when connection of communication cable is installed like

below figure(STAR type).

Installation Manual 57

ENGLISH

Electrical Wiring

Connection method of the connecting cable (Example)

1. Make a hole appropriate for the passage of connection cable through on cap by tool.

2. After knocking out the holes, we recommend you paint the edges and areas around the edges using

the repair paint to prevent rusting

3. Pass the connecting cable through the hole.

4. Properly connect the cable on the terminal block.

5. Fix the connection cable with the cord clamp providing on the unit not to have strain at the terminal.

6. Finally, Fix the cap to the conduit panel.

WARNING

• Loose wiring may cause the terminal to overheat or result in unit malfunction.

• A fire hazard may also exist.

• Therefore, be sure all wiring is tightly connected.

Conduit

Model name

ARWN072BA2 ARWN144BA2 ARWN216BA2 ARWN288BA2 ARWN360BA2 ARWN432BA2

AWG

1064222

Conduit (inch)

2-Jan 1 1/4/01 1/4/01 1/4/01 1/4/01

Knockout Diameter (inch)

8-Jul 1-23/64 1-23/32 1-23/32 1-23/32 1-23/32

Model name

ARWN096DA2 ARWN192DA2 ARWN290DA2 ARWN390DA2 ARWN480DA2 ARWN580DA2

AWG

14126644

Conduit (inch)

2-Jan 2-Jan 1 1 1/4/01 1/4/01

Knockout Diameter (inch)

8-Jul 8-Jul 1-23/64 1-23/64 1-23/32 1-23/32

58 Outside Unit

Electrical Wiring

Dip switch setting

1. Location of setting switch

2. Dip switch setting

1) Set the dip switch and turn on the power of the outside unit to check whether the set value is correctly

entered in the 7 segment.

2) This function is shown for only 2 seconds after the power is connected.

■ Check outside unit setting

• The number on the 7 segment is displayed in order after the power is connected.

• This number represents the setting condition.

■ Mode code

If the applicable dip switch is not set correctly,

the product may not operate properly.

SW01B

SW02B

7 segment

SW01B

1234567

SW02B

1234567

Order Number Item

1 - Model code

2 - Total capacity(HP)

3 2 Heat pump model

4 25 Normal mode display (If the dip switch is set incorrectly, it is not displayed.)

133 Model type (220V)

131 Model type (460V)

220V 460V

Refrigerant

Model Code Capacity (HP) Model Code Capacity (HP)

155 8 138 10

R410A

156 16 139 20

156, 155 24 139, 138 30

156, 156 32 139, 139 40

156, 156, 155 40 139, 139, 138 50

156, 156, 156 48 139, 139, 139 60

Installation Manual 59

ENGLISH

Electrical Wiring

■ Master Outside Setting

SW01B Setting SW02B Setting Remark

Normal mode at shipping

factory

1234567

■ Slave outside Setting (1 unit: master outside)

Function SW01B Setting SW02B Setting Remark

Standard mode at shipping

factory

Standard

Short Pipe Length

Long Pipe Length

1234567

SW01B Setting SW02B Setting Remark

Normal mode at shipping

factory

Slave1 outside setting

(at the 2units)

Slave2 outside setting

(at the 3units)

1234567

60 Outside Unit

Electrical Wiring

Function SW01B Setting SW02B Setting Remark

Standard mode at shipping

factory

longest Pipe

Length

Forced Oil Return

1234567

For water pipe Solenoid

Valve 208/230V power

Use this mode when tem-

perature of circulation inlet

water is under 10°C (50°F)

(You should use an anti

freeze)

You should install the vari-

able water flow valve con-

trol kit before using this

mode.

Vacuum Mode

Water Pipe

Solenoid Valve

208/230V

Functions

Ground source

mode

Variable water

Flow Control

Mode

1234567

■ After operating the dip switch to set the additional function, you must reset the power of the main PCB to

reflect the changed function. (After recovering the dip switch to cancel the additional function, you must

reset the power of the main PCB to reflect the change.)

■ If the dip switch is not set accurately, it can have excessive load on the product operation.

Set the dip switch properly.

Installation Manual 61

ENGLISH

Electrical Wiring

• The address of indoor units would be set by auto addressing

1) Wait for 3 minutes after applying power supply (master and

sub outside unit, indoor unit).

2) Press the switch of the outside unit (SW02V) for 5 seconds.

3) A "88" is indicated on 7-segment LED of the outside unit

PCB.

4) For completing addressing, 2~7 minutes are required

depending on numbers of indoor unit connection set.

5) Numbers of indoor unit connection set whose addressing is

completed are indicated for 30seconds on 7-segment LED

of the outside unit PCB.

6) After completing addressing, address of each indoor unit is

indicated on the wired remote control display window.

(CH01, CH02, CH03, ............. CH06: Indicated as numbers

of indoor unit connection set.)

Indoor unit auto addressing

CAUTION

- In replacement of the indoor unit PCB, always perform auto address setting again.

If power supply is not applied to the indoor unit, operation error occurs.

Auto addressing is only possible on the main PCB

Auto addressing has to be performed after 3 minutes to improve communication.

◆ The Procedure of Automatic Addressing

• Auto addressing setting end

Numbers of indoor unit connection set whose

addressing is completed are indicated for 30seconds

on 7-segment LED after completing setting

Indoor address number is displayed on wired remote control or

indoor unit display window. It is not an error message, will

disappeared when on/off button is pressed on remote control

ex) Display of 01, 02, ..., 15 means connection of 15 indoor

units and auto addressing is completed normally.

Auto addressing start

Waiting 3 minutes

Power On

Press SW02V for 5 sec.

7-segment LED = 88

Don't Press SW02V

Waiting about 2~7 minutes

7-segment LED

YES

NO Check the connections

of transmission line

= 88

62 Outside Unit

Electrical Wiring

Group Number setting

Group Number setting for Indoor Units

① Confirm the power of whole system(Indoor Unit, Outside Unit) is OFF, otherwise turn off.

② The transmission lines connected to INTERNET terminal should be connected to central control of Outside

unti with care for their polarity( A → A, B → B )

③ Turn the whole system on.

④ Set the group and Indoor Unit number with a wired remote control.

⑤ To control several sets of Indoor Units into a group, set the group ID from 0 to F for this purpose.

Terminal block on the main PCB

SODU IDU INTERNET DRY1 DRY2

B(D) A(C)

GND 12V

Group recognizing the simple central controller

No.0 group (00~0F)

No.1 group (10~1F)

No.2 group (20~2F)

No.3 group (30~3F)

No.4 group (40~4F)

No.5 group (50~5F)

No.6 group (60~6F)

No.7 group (70~7F)

No.8 group (80~8F)

No.9 group (90~9F)

No. A group (A0~AF)

No. B group (B0~BF)

No. C group (C0~CF)

No. D group (D0~DF)

No. E group (E0~EF)

No. F group (F0~FF)

Outside Units

Installation Manual 63

ENGLISH

Electrical Wiring

Cool and Heat Selector Installation and Connection

• Connect wires as below figure at the hole of backside of Outside Unit Dry Contact.

• Insert the wire in the connection hole pushing the "Push" button.

• Setting Main PCB Dip SW of Master Outside Unit.

Without Cool/Heat Selector Installation and Connection

In case, try to set mode without Cool/Heat Selector and try to use other switch except from LG Outside

Cool/Heat Selector in field.

Connect signal terminal block as below figure and description.

- How to set mode without Cool/Heat Selector

• Cooling Mode Setting

➀ ➔ GND Connection

➁ ➔ Off (Open)

• Heating Mode Setting

➀ ➔ GND Connection

➁ ➔ GND Connection

• Fan/ All OFF Mode Setting

➀ ➔ Off (Open)

➁ ➔ GND Connection

Mode Change

Push Button

Heating

Outside Unit

: Developing

1. Fan / OFF

OFF

Cooling

GND

64 Outside Unit

Test Run

Water supply system test run

• Before executing the test run for the product, you must first test the heat source water system.

The test run for the product must be executed after checking the flow rate and temperature of the heat source

water supplied.

Design the system including cooling tower, boiler, pump etc.

- Check the equipment capacity (Water volume, temperature control range).

Install the water pipe

Connect the water pipe to the inlet/outlet of the product so that the water

can be supplied to the product.

Execute water supply system test run

- The product does not operate but the pump and water supply equipment

will operate to flow the Heat source water to the heat exchanger on the

product side.

- Flow the water to all water piping system to clean any alien particles inside

the pipes and execute an air purge to remove an air within the pipes to

make the water supply smoother.

- Clean all the strainers of water pipe including around outside units.

Execute the test of water supply system without operating the product.

- Check whether outside unit inlet/outlet flow rate complies to the product

specification.

Standard Water volume is 80LPM based on 8HP and 150LPM based on

16HP.

- Check the water supply temperature. whether is OK

After checking the normal condition of the water supply, execute the test run

of the product.

To prevent the freezing of the heat exchanger when the refrigerant is dis-

charged with the water supply blocked, discharge the refrigerant after

draining out around the outside unit.

Equipment design

Water pipe system installation

Water supply system test run

Execute the product test run

Judging whether there is any

problem with the water supply

Water supply pipe and product

connection

Installation Manual 65

ENGLISH

How to Cope with Abnormal Test Run

Item

Phenomenon

Cause Checkpoint and resolution

Check whether the heat source water supply pump is operating.

Check whether the heat source water supply pipe is clogged.

(Clean strainer, valve locked, valve issue, air trapped etc.)

Check whether the flow switch is normal condition.

(Flow switch problem, arbitrary control, disconnection etc.)

Check whether heat source water supply pump is operating.

Check whether the heat source water supply pipe is clogged.

(Clean strainer, valve locked, valve issue, air trapped etc.)

Whether

heat water

is supplied

Heat water not supplied or flow

rate is insufficient (During air con-

ditioning)

CH32

When connecting the flow switch,

heat-sourced water doesn’t flow or

the amount of its flow lacks due to

the checked error related to heat-

sourced water.

CH24

Test Run

Precaution before test run

Check whether the air is completely removed and the water supply is flowing smoothly.

Check whether there is any refrigerant leakage of any disconnected or loose communication or power wire, or use

the electric wiring diagram to check the wiring connection condition.

Check whether the power and communication wire are connected.

Check whether the power cable L1, L2, L3 are correctly connected.

Check the insulation resistance with the DB mega tester device (DC 500V) between the power terminal block and

grounding, and check whether it is 2.0MΩ or above when measured.

If the resistance is 2.0MΩ or less, do not operate the product.

Precaution)

- Never check the insulation resistance for the terminal control board.

(The control board can be damaged.)

- If you leave the system turned off right after the installation or for a long period of time, the refrigerant gets accu-

mulated within the compressor and the insulation resistance reduces to less than 2 MΩ. When the insulation

resistance is 2 MΩ or less, turn on the power and let the electricity be supplied to the crank case heater of the

compressor and let the refrigerant including the oil inside the compressor to evaporate.

Then the insulation resistance value will increase to more than 2.0 MΩ.

Check whether the liquid and gas pipes are open.

Precaution when blocking the water cooling type Multi V main power

- While using the product (Air conditioning season/Heating season), always connect the main power of the outside

unit.

- During the test run operation after installing the product or during the operation after blocking the outside unit

main power (Power outage etc.), you must always connect the power 6 hours prior to heating the crank case

heater. If the crank case is not preheated for more than 6 hours with the electric heater, it can cause a burn on

the compressor.

(Heating the bottom part of the compressor with the crank case heater is to evaporate the refrigerant included in

the oil inside the compressor.)

• Always check whether the water supply is flowing smoothly before the test run. (If sufficient amount

of water is not flowing, it can burn the product.)

• During the initial test run after installing the product, leaving the product for more than 3 days or

after replacing the compressor, power must be connected 6 hours prior to the operation to heat the

compressor heater. (If the product is not heated sufficiently, it can burn the product.)

66 Outside Unit

Test Run

Maintenance of plate type heat exchanger

❈ When CH24 or CH180 error occurs during the test operation of the heater, the inside of the panel heat exchanger may be

partially frozen and therefore, be sure to get rid of its cause and then, re-operate the device.

(The root cause of partial freezing: The lack of flow of heat-sourced water, suspension of water, lack of cooling medium,

infiltration of foreign substance inside of panel heat exchanger )

As the scales are created in the panel heat exchanger, its efficiency may decrease or damage may occur due to winter-sowing due

to the decrease in its flow.

Due to this reason, regular maintenance is necessary so that the scales shouldn't be created.

1. Before the season of use, check below points.(Once a year)

1) inspection on water quality to check if this is within the standard condition.

2) Clean the strainer.

3) Check if the flow is appropriate.

4) Check if the operation environment is appropriate.(Pressure, flow, output temperature)

2. Below procedure should be abided by in order to clean the panel heat exchanger. (Once every 5 years)

1) Check if the service port is equipped with the water pipe in order to clean the chemical solution.

5% diluted formic acid, citric acid, oxalic acid, acetate acid, phosphoric acid and etc. are appropriate for the chemical solution

for wiping out the scales.(Hydrochloric acid, sulphuric acid, nitric acid and etc. shouldn't be used due to its corrosion.)

2) Be sure to check if the gate valve of inflow/outflow pipe and the valve for outflow pipe are properly closed when cleaning.

3) Connect the water pipe for cleaning with the chemical solvent through the service plug of the pipe and fill up the panel heat

exchanger with 50°C~60°C(122°F~140°F) of cleaning solvent and circulate it with the pump for 2~5 hours. The circulation

time may depend on the temperature of the cleaning solvent or the creation of the scales. Therefore, observe change in the

color of the chemical solvent to set the circulation time for removing the scales.

4) After the circulation of the solvent, extract the solvent inside of the panel heat exchanger and fill up 1~2% of NaOH or NaHCO

and then, circulate it for 15~20 minutes to neutralize the heat exchanger.

5) Once the neutralization is completed, clean the inside of the panel heat exchanger with clean water.

Measure the water Ph to check if the chemical solvent is properly removed or not.

6) When using a different kind of chemical solvent in the market, be sure to check if there is any corrosive action to stainless or

copper in advance or not.

7) For details on the cleaning chemical solvent, be sure to consult the specialists of the related corporation.

3. After cleaning, operate the device to see if it works properly once again.

Gate valve(locked)

Service plug

Strainer

Outflow water

valve(locked)

Gate valve(locked)

Water-cooling

type multi V

Hose

Pump

[Cleaning the panel heat exchanger]

Screening net

Item

Phenomenon

Cause Checkpoint and resolution

Check whether heat source water supply pump is operating.

Check whether the heat source water supply pipe is clogged.

(Clean strainer, valve locked, valve issue, air trapped etc.)

Check whether heat source waterr supply pump is operating.

Check whether the heat source watersupply pipe is clogged.

(Clean strainer, valve locked, valve issue, air trapped etc.)

Whether

heat water

is supplied

Heat water not supplied or flow

rate is insufficient

Heat water not supplied or flow

rate is insufficient (During heat-

ing)

CH34

CH180

Installation Manual 67

ENGLISH

Daily check/management

Maintenance/Repair checklist

Test Run

1. Water quality control

The plate type heat exchanger is not structured to be disassembled, cleaned or replaced with parts.

To prevent corrosion or scaling on the plate type heat exchanger, special care must be taken to control the water quality.

Water quality must satisfy the minimum criteria of the reference water quality items.

When anti-corrosion agent or corrosion inhibitor is added, the substance must not have any corrosive effect on stainless

steel and copper.

Even if the circulating water is not contaminated by the external air, it is recommended to empty the water flowing in the

pipe and to resupply the water.

2. Flow rate control

If the flow rate is insufficient, it can cause freezing on the plate type heat exchanger.

Check whether the strainer is clogged or whether the pipe is filled with air and then check the temperature and pressure

difference of the inlet and outlet pipe to check whether the flow rate is insufficient.

If the temperature and pressure difference is above the appropriate level, it means that the flow rate is reduced. In this

case, the operation must immediately be stopped and re-operated when the root cause is resolved. (*If air is trapped in

the pipe, the air must be purged. Air inside the water pipe interferes with the circulation of the heat water supply and can

cause insufficient flow rate or freezing.)

3. Brine density management

When using the brine (Anti-freeze) in the heat water supply, designated type and density must be used. Calcium chloride

brine can cause corrosion on the plate type heat exchanger and must not be used.

If the anti-freeze liquid is left as is, it absorbs the moisture from the air to cause a drop in the density, leading to freezing

of plate type heat exchanger. Therefore minimize the contact surface with the atmosphere and periodically measure the

density of the brine to supplement the brine as needed to maintain the density.

Product operating condition

Heat exchanger cleaning (Wash)

Strainer cleaning

Water quality check

Refrigerant leakage check

Indoor unit filter cleaning

Period (Year)

Checkpoint

• The above checklist is set based on the minimum period and more frequent checking can be required depending on the operating condition/water quality condition.

• When cleaning the heat exchanger, make sure to take parts out or lock the value so that chemical detergent does not penetrate into the pressure gauge etc.

• When cleaning the heat exchanger, check the connecting part of the water pipes prior to cleaning so that the chemical detergent does not leak.

• After sufficiently mixing the chemical detergent with water, start cleaning.

• Cleaning the heat exchanger is easier at the initial stage and becomes difficult after the scaling has accumulated.

• In areas where the water quality is poor, cleaning is required periodically.

Because chemical detergent has strong acidity, it must be washed off thoroughly with water.

• To check whether it is cleaned well inside, remove the hose and check the inside.

• Purge the air to remove any air inside the water pipe.

• After checking, always check whether the heat water supply is flowing normally flowing before operating the product.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

●●●●●●●●●●●●●●●

●● ●

●●●●●●●●●●●●●●●

● ●

●●●●●●●●●●●●●●●

(

●

: Check mark)

68 Outside Unit

Test Run

Self-Diagnosis Function

Error Indicator

• This function indicates types of failure in self-diagnosis and occurrence of failure for air condition.

• Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LED of

outside unit control board as shown in the table.

• If more than two troubles occur simultaneously, lower number of error code is first displayed.

• After error occurrence, if error is released, error LED is also released simultaneously.

Error Display

1st,2nd LED of 7-segment indicates error number, 3rd LED indicates unit number.

Ex) 211 : No.21 error of master unit

213 : No.21 error of slave2

011 → 051 : No.105 error of master unit

Air temperature sensor of indoor unit is open or short

Inlet pipe temperature sensor of indoor unit is open or short

Failing to receive wired remote controller signal in indoor unit PCB

Malfunction of drain pump

Failing to receive outside unit signal in indoor unit PCB

Outlet pipe temperature sensor of indoor unit is open or short

In case when the serial number marked on EEPROM of Indoor unit is

0 or FFFFFF

Disconnecting the fan motor connector/Failure of indoor fan motor lock

Master outside unit Variable speed compressor drive IPM error

Slave1 outside unit Variable speed compressor drive IPM error

Slave2 outside unit Variable speed compressor drive IPM error

DC voltage is not charged after master outside unit operating relay is

turned on

DC voltage is not charged after slave1 outside unit operating relay is

turned on

DC voltage is not charged after slave2 outside unit operating relay is

turned on

Compressor maintenance by master outside unit high pressure switch

Flow rate insufficiency or flow switch trouble of master outside unit

Compressor maintenance by slave1 outside unit high pressure switch

Flow rate insufficiency or flow switch trouble of slave1 outside unit

Compressor maintenance by slave2 outside unit high pressure switch

Flow rate insufficiency or flow switch trouble of slave2 outside unit

Master outside unit input voltage of 290V or above or 173V or less

Slave1 outside unit input voltage of 290V or above or 173V or less

Slave2 outside unit input voltage of 290V or above or 173V or less

Initial operation failure due to master outside unit Variable speed com-

pressor error

0 1 - Air temperature sensor of indoor unit

0 2 - Inlet pipe temperature sensor of indoor unit

03-

Transmission error : wired remote controller ↔

indoor unit

0 4 - Drain pump

0 5 - Transmission error : outside unit ↔ indoor unit

0 6 - Outlet pipe temperature sensor of indoor unit

0 9 - Indoor EEPROM Error

1 0 - Poor fan motor operation

211

Master outside unit Variable speed compressor

IPM fault

212

Slave1 outside unit Variable speed compressor

IPM fault

2 1 3 Slave2 outside unit Variable speed compressor

IPM fault

231

Master outside unit Variable speed compressor

DC link under-voltage

232

Slave1 outside unit Variable speed compressor

DC link under-voltage

233

Slave2 outside unit Variable speed compressor

DC link under-voltage

2 4 1 Master outside unit high pressure switch

2 4 2 Slave1 outside unit high pressure switch

2 4 3 Slave2 outside unit high pressure switch

251

Master outside unit input voltage over-volt-

age/under-voltage

252

Slave1 outside unit input voltage over-volt-

age/under-voltage

253

Slave2 outside unit input voltage over-volt-

age/under-voltage

261

Master outside unit Variable speed compressor

operation failure error

Display

Error item Root cause of error

number

Indoor unitOutside unit

Installation Manual 69

ENGLISH

Test Run

Display

Error item Root cause of error

number

Initial operation failure due to slave1 outside unit Variable speed com-

pressor error

Initial operation failure due to slave2 outside unit Variable speed com-

pressor error

Compressor turned Off due to master outside unit inverter DC voltage

over-charge

Compressor turned Off due to slave1 outside unit inverter DC voltage

over-charge

Compressor turned Off due to slave2 outside unit inverter DC voltage

over-charge

Master outside unit Variable speed compressor error or operating com-

ponent (IPM) error operation

Slave1 outside unit Variable speed compressor error or operating com-

ponent (IPM) error operation

Slave2 outside unit Variable speed compressor error or operating com-

ponent (IPM) error operation

Compressor turned off due to master outside unit inverter CT under-

current

Compressor turned off due to slave outside unit inverter CT under-cur-

rent

Compressor turned off due to slave1 outside unit inverter CT under-

current

Compressor turned off due to master outside unit Variable speed com-

pressor discharge temperature over-rise

Flow rate insufficiency or flow switch trouble of master outside unit

Compressor turned off due to slave1 outside unit Variable speed com-

pressor discharge temperature over-rise

Flow rate insufficiency or flow switch trouble of slave1 outside unit

Compressor turned off due to slave2 outside unit Variable speed com-

pressor discharge temperature over-rise

Flow rate insufficiency or flow switch trouble of slave2 outside unit

Compressor turned off due to master outside unit Fixed speed com-

pressor discharge temperature over-rise

Compressor turned off due to slave1 outside unit Fixed speed com-

pressor discharge temperature over-rise

Compressor turned off due to slave2 outside unit Fixed speed com-

pressor discharge temperature over-rise

Compressor turned off due to master outside unit high pressure over-rise

Compressor turned off due to slave1 outside unit high pressure over-rise

Compressor turned off due to slave2 outside unit high pressure over-rise

Compressor turned off due to master outside unit low pressure over-

drop.

Compressor turned off due to slave1 outside unit low pressure over-drop.

Compressor turned off due to slave2 outside unit low pressure over-drop.

Failing to transmission between inverter Micom and converter Micom

of master outside unit

Failing to transmission between inverter Micom and converter Micom

of slave1 outside unit

Failing to transmission between inverter Micom and converter Micom

of slave2 outside unit

Master outside unit Variable speed compressor current detection (CT)

sensor disconnection or short circuit

262

Slave1 outside unit Variable speed compressor

operation failure error

263

Slave2 outside unit Variable speed compressor

operation failure error

281

Master outside unit inverter DC link over-volt-

age error

282

Slave1 outside unit inverter DC link over-volt-

age error

283

Slave2 outside unit inverter DC link over-volt-

age error

291

Master outside unit Variable speed compressor

over-current

292

Slave1 outside unit Variable speed compressor

over-current

293

Slave2 outside unit Variable speed compressor

over-current

311

Master outside unit inverter CT under-current

error

312

Slave outside unit inverter CT under-current

error

313

Slave1 outside unit inverter CT under-current

error

321

Master outside unit Variable speed compressor

discharge temperature over-rise

322

Slave1 outside unit Variable speed compressor

discharge temperature over-rise

323

Slave2 outside unit Variable speed compressor

discharge temperature over-rise

331

Master outside unit Fixed speed compressor

discharge temperature over-rise

332

Slave1 outside unit Fixed speed compressor

discharge temperature over-rise

333

Slave2 outside unit Fixed speed compressor

discharge temperature over-rise

3 4 1 Master outside unit high pressure over-rise

3 4 2 Slave1 outside unit high pressure over-rise

3 4 3 Slave2 outside unit high pressure over-rise

351

Master outside unit low pressure over-drop.

3 5 2 Slave1 outside unit low pressure over-drop.

3 5 3 Slave2 outside unit low pressure over-drop.

391

PFC Transmission error of master outside unit:

Inv.Micom ↔ Convertor Micom

392

PFC Transmission error of slave1 outside unit:

Inv.Micom ↔ Convertor Micom

393

PFC Transmission error of slave2 outside unit:

Inv.Micom ↔ Convertor Micom

401

Master outside unit Variable speed compressor

CT sensor error

Outside unit

70 Outside Unit

Test Run

Display

Error item Root cause of error

number

Slave1 outside unit Variable speed compressor current detection (CT)

sensor disconnection or short circuit

Slave2 outside unit Variable speed compressor current detection (CT)

sensor disconnection or short circuit

Master outside unit Variable speed compressor discharge temperature

sensor disconnection or short circuit

Slave1 outside unit Variable speed compressor discharge temperature

sensor disconnection or short circuit

Slave2 outside unit Variable speed compressor discharge temperature

sensor disconnection or short circuit

Master outside unit under-voltage sensor disconnection or short circuit

Slave1 outside unit under-voltage sensor disconnection or short circuit

Slave2 outside unit under-voltage sensor disconnection or short circuit

Master outside unit over-voltage sensor disconnection or short circuit

Slave1 outside unit over-voltage sensor disconnection or short circuit

Slave2 outside unit over-voltage sensor disconnection or short circuit

Master outside unit air temperature sensor disconnection or short cir-

cuit

Slave1 outside unit air temperature sensor disconnection or short cir-

cuit

Slave2 outside unit air temperature sensor disconnection or short cir-

cuit

Master outside unit heat exchange temperature sensor (A) disconnec-

tion or short circuit

Slave1 outside unit heat exchange temperature sensor (A) disconnec-

tion or short circuit

Slave2 outside unit heat exchange temperature sensor (A) disconnec-

tion or short circuit

Master outside unit suction temperature sensor disconnection or short

circuit

Slave1 outside unit suction temperature sensor disconnection or short

circuit

Slave2 outside unit suction temperature sensor disconnection or short

circuit

Master outside unit Fixed speed compressor discharge temperature

sensor disconnection or short circuit

Slave1 outside unit Fixed speed compressor discharge temperature

sensor disconnection or short circuit

Slave2 outside unit Fixed speed compressor discharge temperature

sensor disconnection or short circuit

Master outside unit Fixed speed compressor discharge temperature

sensor disconnection or short circuit

Slave1 outside unit Fixed speed compressor discharge temperature

sensor disconnection or short circuit

Slave2 outside unit Fixed speed compressor discharge temperature

sensor disconnection or short circuit

Master outside unit power line phase missing

Slave1 outside unit power line phase missing

Slave2 outside unit power line phase missing

Excessive connection of indoor unit connection display value (Different

from outside unit)

402

Slave1 outside unit Variable speed compressor

CT sensor error

403

Slave2 outside unit Variable speed compressor

CT sensor error

411

Master outside unit Variable speed compressor

discharge temperature sensor error

412

Slave1 outside unit Variable speed compressor

discharge temperature sensor error

413

Slave2 outside unit Variable speed compressor

discharge temperature sensor error

4 2 1 Master outside unit under-voltage sensor error

4 2 2 Slave1 outside unit under-voltage sensor error

4 2 3 Slave2 outside unit under-voltage sensor error

4 3 1 Master outside unit over-voltage sensor error

4 3 2 Slave1 outside unit over-voltage sensor error

4 3 3 Slave2 outside unit over-voltage sensor error

441

Master outside unit air temperature sensor

error

442

Slave1 outside unit air temperature sensor

error

443

Slave2 outside unit air temperature sensor

error

451

Master outside unit heat exchange temperature

sensor (A) error

452

Slave1 outside unit heat exchange temperature

sensor (A) error

453

Slave2 outside unit heat exchange temperature

sensor (A) error

461

Master outside unit suction temperature sensor

error

462

Slave1 outside unit suction temperature sensor

error

463

Slave2 outside unit suction temperature sensor

error

471

Master outside unit Fixed speed compressor

discharge temperature sensor error

472

Slave1 outside unit Fixed speed compressor

discharge temperature sensor error

473

Slave2 outside unit Fixed speed compressor

discharge temperature sensor error

481

Master outside unit Fixed speed compressor

discharge temperature sensor error

482

Slave1 outside unit Fixed speed compressor

discharge temperature sensor error

483

Slave2 outside unit Fixed speed compressor

discharge temperature sensor error

5 0 1 Master outside unit 3 phase power missing

5 0 2 Slave1 outside unit 3 phase power missing

5 0 3 Slave2 outside unit 3 phase power missing

511

Over-capacity (Indoor unit capacity sum is

excessive) connection

Outside unit

Installation Manual 71

ENGLISH

Test Run

Display

Error item Root cause of error

number

When the inverter controller signal is not received from the master out-

side unit inverter controller

When the inverter controller signal is not received from the slave1 out-

side unit inverter controller

When the inverter controller signal is not received from the slave2 out-

side unit inverter controller

When the indoor unit control signal is not received from the master out-

side unit controller

Master outside unit 3 phase power reverse phase connection

Slave1 outside unit 3 phase power reverse phase connection

Slave2 outside unit 3 phase power reverse phase connection

When the dip switch(No.8) setting is different between master and

slave outside unit

Master outside unit inverter PCB EEPROM ACCESS error

Slave1 outside unit inverter PCB EEPROM ACCESS error

Slave2 outside unit inverter PCB EEPROM ACCESS error

Master outside unit static speed CT sensor disconnection or short cir-

cuit

Slave1 outside unit static speed CT sensor disconnection or short cir-

cuit

Slave2 outside unit static speed CT sensor disconnection or short cir-

cuit

Master outside unit inverter PCB input instant over-current (Peak)

exceeded

Slave1 outside unit inverter PCB input instant over-current (Peak)

exceeded

Slave2 outside unit inverter PCB input instant over-current (Peak)

exceeded

When the master outside unit inverter PCB input current is different

When the slave1 outside unit inverter PCB input current is different

When the slave2 outside unit inverter PCB input current is different

Communication error between master outside unit master MICOM and

EEPROM or EEPROM missing

Communication error between slave1 outside unit master MICOM and

EEPROM or EEPROM missing

Communication error between slave2 outside unit master MICOM and

EEPROM or EEPROM missing

When signal from slave outside unit is not received from master out-

side unit master MICOM

When signal from slave outside unit is not received from slave1 out-

side unit master MICOM

When signal from slave outside unit is not received from slave2 out-

side unit master MICOM

521

Communication error with master outside unit

inverter controller

522

Communication error with slave1 outside unit

inverter controller

523

Communication error with slave2 outside unit

inverter controller

53-

Communication error with master outside unit

controller and indoor unit

541

Master outside unit 3 phase power reverse

phase

542

Slave1 outside unit 3 phase power reverse

phase

543

Slave2 outside unit 3 phase power reverse

phase

59-

Wrong setting between master and slave out-

side unit

601

Master outside unit inverter PCB EEPROM

error

602

Slave1 outside unit inverter PCB EEPROM

error

603

Slave2 outside unit inverter PCB EEPROM

error

701

Master outside unit static speed CT sensor

error

702

Slave1 outside unit static speed CT sensor

error

703

Slave2 outside unit static speed CT sensor

error

731

Master outside unit inverter PCB input instant

over-current (Peak)

732

Slave1 outside unit inverter PCB input instant

over-current (Peak)

733

Slave2 outside unit inverter PCB input instant

over-current (Peak)

741

Master outside unit inverter PCB phase imbal-

ance

742

Slave1 outside unit inverter PCB phase imbal-

ance

743

Slave2 outside unit inverter PCB phase imbal-

ance

861

Master outside unit master PCB EEPROM

error

862

Slave1 outside unit master PCB EEPROM

error

863

Slave2 outside unit master PCB EEPROM

error

1041

Communication error between master outside

unit and outside unit

1042

Communication error between slave1 outside

unit and outside unit

1043

Communication error between slave2 outside

unit and outside unit

Outside unit

72 Outside Unit

Test Run

■ Refer to the troubleshooting guide of service technical manual for each error.

Display

Error item Root cause of error

number

Master outside unit liquid pipe temperature sensor disconnection or

short circuit

Slave1 outside unit liquid pipe temperature sensor disconnection or

short circuit

Slave2 outside unit liquid pipe temperature sensor disconnection or

short circuit

Master outside unit over-cooling inlet temperature sensor disconnec-

tion or short circuit

Slave1 outside unit over-cooling inlet temperature sensor disconnec-

tion or short circuit

Slave2 outside unit over-cooling inlet temperature sensor disconnec-

tion or short circuit

Master outside unit over-cooling outlet temperature sensor disconnec-

tion or short circuit

Slave1 outside unit over-cooling outlet temperature sensor disconnec-

tion or short circuit

Slave2 outside unit over-cooling outlet temperature sensor disconnec-

tion or short circuit

Outside unit 4 way valve switch error

Master outside unit Fixed speed compressor burn, locking and over-

current

Slave1 outside unit Fixed speed compressor burn, locking and over-

current

Slave2 outside unit Fixed speed compressor burn, locking and over-

current

Plate type heat exchanger freeze prevention error

Water temperature sensor open/short

Communication error between main MICOM and sub MICOM

1131

Master outside unit liquid pipe temperature

sensor error

1132

Slave1 outside unit liquid pipe temperature

sensor error

1133

Slave2 outside unit liquid pipe temperature

sensor error

1141

Master outside unit over-cooling inlet tempera-

ture sensor error

1142

Slave1 outside unit over-cooling inlet tempera-

ture sensor error

1143

Slave2 outside unit over-cooling inlet tempera-

ture sensor error

1151

Master outside unit over-cooling outlet temper-

ature sensor error

1152

Slave1 outside unit over-cooling outlet temper-

ature sensor error

1153

Slave2 outside unit over-cooling outlet temper-

ature sensor error

1 5 1 - Outside unit 4 way valve switch failure

1731

Master outside unit Fixed speed compressor

error

1732

Slave1 outside unit Fixed speed compressor

error

1733

Slave2 outside unit Fixed speed compressor

error

1 8 0 - Plate type heat exchanger freeze prevention

1 8 1 - Water temperature sensor error

1 8 2 - Communication error between MICOMs

Outside unit

Installation Manual 73

ENGLISH

Cooling tower applied method

[Open type cooling tower + Second heat exchanger]

Heat exchanger is installed between the cooling tower

and outside unit system piping, and the temperature

difference between 1st side and 2nd side is main-

tained constantly

[Closed type cooling tower]

Heat source water of the cooling tower is supplied

directly to the outside unit system.

Open type

cooling tower

Closed type

cooling tower

side

Heat exchange

When the open type cooling tower is used and the water supply is directly connected to the 2nd heat exchanger, product

damage by alien particle cannot be repaired for free.

- Always use the 2nd heat exchanger.

74 Outside Unit

Caution For Refrigerant Leak

The installer and system specialist shall secure safety against leakage according to local regulations or standards.

The following standards may be applicable if local regulations are not available.

Though the R410A refrigerant is harmless and incombustible itself , the room to equip the air conditioner should be large to

such an extent that the refrigerant gas will not exceed the limiting concentration even if the refrigerant gas leaks in the room.

■ Limiting concentration

Check limiting concentration along following steps and take appropriate measure depending on the situation.

■ Calculate amount of all the replenished refrigerant (kg) per each refrigerant

system.

■ Calculate minimum room capacity

Calculate room capacity by regarding a portion as one room or the smaller room.

(1) Without partition

(2) With partition and with opening which serve as

passage of air to adjoining room

Caution For Refrigerant Leak

Introduction

Checking procedure of limiting concentration

Limiting concentration is the limit of Freon gas concentration where immediate measures can be taken with-

out hurting human body when refrigerant leaks in the air. The limiting concentration shall be described in the

unit of kg/m

(Freon gas weight per unit air volume) for facilitating calculation.

Limiting concentration: 0.44kg/m

(R410A)

Outside unit

(No.1 system)

Flow of

refrigerant

Indoor unit

Room where refrigerant leaks

(Refrigerant of the whole No.1

system flows out.)

Amount of additional

replenished refrigerant

Total amount of replenished

refrigerant in refrigerant

facility (kg)

Note : In case one refrigerant facility is

divided into 2 or more refrigerant

systems and each system is

independent, amount of replenished

refrigerant of each system shall be

adopted.

Outside unit

Indoor unit

Outside unit

Indoor unit

Opening

Partition

In the case of opening

without door , or 0.15

% or more openings

(to floor space) both

above and below door)

Amount of replenished

refrigerant per one outside

unit system

Amount of replenished

refrigerant at factory shipment

Amount of additionally

replenished refrigerant

depending on piping

length or piping

diameter at customer

Installation Manual 75

ENGLISH

Caution For Refrigerant Leak

(3) With partition and without opening which serve as passage of air to adjoining room

Calculate refrigerant concentration

■ In case the concentration exceeds the limit

When the concentration exceeds the limit, change original plan or take one of the countermeasures

shown below:

• Countermeasure 1

Provide opening for ventilation.

Provide 0.15% or more opening to floor space both above and below door, or provide opening without

door.

• Countermeasure 2

Provide gas leak alarm linked with mechanical ventilator.

Reducing the outside refrigerant qty.

Pay a special attention to the place, such as a basement, etc. where refrigerant can stay, since refrigerant is

heavier than air.

Outside unit

Indoor unit

Smallest

room

(R410A)

Refrigerant concentration

(kg/m

)

Total amount of replenished

refrigerant in refrigerant facility (kg)

Capacity of smallest room where

indoor unit is installed (m

)

In case the result of calculation exceeds

the limiting concentration, perform the

same calculations by shifting to the

second smallest, and the third smallest

rooms until at last the result is below the

limiting concentration.

Countermeasure 2

Gas leak alarm

Mechanical ventilator

Countermeasure 1

Opening effective to ventilation

Indoor unit

76 Outside Unit

Water Solenoid Valve Control

CN_26

CN_24

CN_22

INTERNET

MAIN PCBC_Box

DDC BMS

Flow Switch

Solenoid

Valve

Water

Out

Water

CN_26

CN_24

CN_22

MAIN PCBC_Box

Flow Switch

Solenoid

Valve

Water

Out

Water

L2 3(A) 3(B)

4(A) 4(B)

L2 3(A) 3(B)

4(A) 4(B)

Water Solenoid Valve Control

Set the dip switch refer to Fig.1 and turn on the power when you individual control for water solenoid valve

control.

Figure 1

1234567

Central Control (Use DDC Port)

Individual Control (Use 208/230V Out Port)

Variable Water Flow Control KIT(Accessory)

Installation Manual 77

ENGLISH

Variable Water Flow Control KIT(Accessory)

1. Shut off the main power line of outdoor unit.

2. Install the VWFC(Variable Water Flow Control) PCB in the C/BOX by using screws.

3. Install the transformer in the C/BOX by using screws.

4. Install the terminal block in the C/BOX by using screws.

5. Connect the Main PCB(CN41) to VWFC(CN_OUT) by using the cable assy.

6. Connect the blue wire of transformer to the Main PCB (JIG1(L), JIG2(N)).

7. Connect the red wire of transformer to the terminal block (2Pin Yellow terminal block).

8. Connect a power cable (DC 12V) to CN_PWR(12V, GND) of VWFC.

9. Connect a signal cable (DC 0~10V) of water flow control valve to CN_AO(AO_01(A+), GND(A-)) of VWFC.

10. Case of two water flow control valve, Connect a signal cable (DC 0~10V) of water flow control valve to

CN_AO(AO_02(B+), GND(B-)) of VWFC.

11. Connect a power cable (AC 24V) of water flow control valve to the terminal block (2Pin Yellow terminal block, Max cur-

rent 0.42A).

12. Connect the RS-485 communication cable to CN_COMM(BUS_A, BUS_B) of VWFC

13. Set up the main function Dip S/W of VWFC PCB.

14. Set up the Dip SW of outdoor main PCB.

15. Turn on the main power line of outdoor unit.

16. Check the signal of water flow control valve to CN_AO(AO_01, GND) of VWFC and the water flow rate.

1 2 3

1: Terminal block

2 : Transformer

3 : VWFC PCB

1. Install the product on flat surface and screw at least 2 places. Otherwise the VWFC PCB may not be anchored properly.

2. Do not deform the case at random. It may cause malfunction of the Variable Water Flow Control PCB

3. This is a class A product. In a non-industrial environment, this product may cause radio interference, in which case the user

may be required to take adequate measures.

78 Outside Unit

USA, press #2 for PTAC, TTW

USA, press #3 for DFS, Multi V

CANADA

888-865-3026

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LG Electronics, Air conditioning Division

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LGECI

LG ELECTRONICS CANADA INC.

20 NORELCO DRIVE.

NORTH YORK, ONTARIO M9L 2X6.

LG Electronics ARWN072BA2

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