MULTI V ARWB180LAS4 - Water pump LG - Free user manual and instructions

USER MANUAL MULTI V ARWB180LAS4 LG

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.

MULTI V™

WATER IV

Original instruction

Barcode image with black and white vertical bars, no visible text or symbols beyond the pattern

P/NO:MFL68100326

TIPS FOR SAVING ENERGY

Here are some tips that will help you minimize the power consumption when you use the air conditioner. You can use your air conditioner more efficiently by referring to the instructions below:

• Do not cool excessively indoors. This may be harmful for your health and may consume more electricity.
• Block sunlight with blinds or curtains while you are operating the air conditioner.
• Keep doors or windows closed tightly while you are operating the air conditioner.
• Adjust the direction of the air flow vertically or horizontally to circulate indoor air.
• Open windows regularly for ventilation as the indoor air quality may deteriorate if the air conditioner is used for many hours.
• Clean the air filter once every 2 weeks. Dust and impurities collected in the air filter may block the air flow or weaken the cooling / dehumidifying functions.

For your records

Staple your receipt to this page in case you need it to prove the date of purchase or for warranty purposes. Write the model number and the serial number here:

Model number :

Serial number :

You can find them on a label on the side of each unit.

Dealer's name :

Date of purchase :

IMPORTANT SAFETY INSTRUCTIONS

READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE.

Always comply with the following precautions to avoid dangerous situations and ensure peak performance of your product

WARNING

It can result in serious injury or death when the directions are ignored

CAUTION

It can result in minor injury or product damage when the directions are ignored

WARNING

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

• 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 performed 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 contact 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 at the outdoors.
• 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.
• 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.
• 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 protection 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.
• 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.

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.

CAUTION

Installation

• Always check for gas (refrigerant) leakage after installation 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 preserving foods, works of art, etc. It is a consumer air conditioner, not a precision refrigeration system.
• There is risk of damage or loss of property.
• 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 creating noise that disturbs medical treatment or image broadcasting.

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.

- Install and insulate the drain hose to ensure that water is drained away properly based on the installation manual. - A bad connection may cause water leakage.

- 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.

- 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 operation. - 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 operational season.

- 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 stopping 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 connecting the power of all indoor and outdoor 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.

TABLE OF CONTENTS

2 TIPS FOR SAVING ENERGY
2 IMPORTANT SAFETY INSTRUCTIONS

4 INSTALLATION PROCESS

4 OUTSIDE UNITS INFORMATION

6 ALTERNATIVE REFRIGERANT R410A

15 INSTALLATION OF WATER PIPE

15 DEVICE PROTECTION UNIT

16 PIPE CONNECTIONS BETWEEN INDOOR AND OUTSIDE UNIT

24 ELECTRICAL WIRING

29 HR UNIT PCB

37 TEST RUN

41 CAUTION FOR REFRIGERANT LEAK

42 COOLING TOWER APPLIED METHOD

42 WATER SOLENOID VALVE CONTROL

43 INSTALLATION GUIDE FOR HARMONICS AND FLICKER

INSTALLATION PROCESS

graph TD
    A["Determination of division work"] --> B["Preparation of contract drawings"]
    B --> C["Sleeve and insert work"]
    C --> D["Installation of indoor unit"]
    D --> E["Refrigerant piping work"]
    E --> F["Drain pipe work"]
    F --> G["Duct work"]
    G --> H["Heat insulation work"]
    H --> I["Electrical work (connection circuits and drive circuits)"]
    I --> J["Airtight test"]
    J --> K["Vacuum drying"]
    K --> L["Additional charge of refrigerant"]
    L --> M["Fit facing panels"]
    M --> N["Automatic addressing of indoor unit"]
    N --> O["Test run adjustment"]
    O --> P["Transfer to customer with explanation"]

    C --> Q["Take account of gradient of drain piping"]
    Q --> R["The foundation must be level even"]
    R --> S["Installation of outside unit"]
    S --> T["Avoid short circuits and ensure sufficient space is allowed for service"]

    E --> U["Special attention to dryness, cleanliness and tightness"]
    U --> V["Adjust to downward gradient"]
    V --> W["Make sure airflow is sufficient"]
    W --> X["Make sure no gaps are left where the insulating materials are joined"]
    X --> Y["Multiple core cable must not be used. (suitable cable should be selected)"]

    J --> Z["In the final check for 24 hours at 3.8 MPa(38.7 kgf/cm²) there must be no drop in pressure."]
    K --> AA["The vacuum pump used must have a capacity of reaching at least 5 torr, more than 1 hour"]
    L --> AB["Recharge correctly as calculated in this manual, and record the amount of added refrigerant"]
    M --> AC["Make sure there are no gaps left between the facing materials used on the ceiling"]
    N --> AD["Refer to automatic addressing flowchart Preheat the crank case with the electrical heater for more than 6 hours."]
    O --> AE["Run each indoor unit in turn to make sure the pipe work has been fitted correctly"]
    P --> AF["Explain the use of the system as clearly as possible to your customer and make sure all relevant documentation is in order"]

CAUTION

• 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 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.)

OUTSIDE UNITS INFORMATION

CAUTION

• 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 Ratio(50\~200%)

Outside Unit Number Connection Ratio
Single outside unit s 200%
Double outside unit s 160%
More than Triple outside unit s	130%

Notes: * We can guarantee the operation only within 130% Combination. If you want to connect more than 130% combination, please contact us and discuss the requirement like below.

• If the operation of indoor unit is more than 130%, low airflow operation is recommended in all the indoor units.
• If the operation of indoor unit is more than 130%, additional refrigerant is needed according to the Aheadquarter guidance.
  • Over 130%, capacity is same as capacity of 130%, Same remark is valid for power input.

Power Supply : 3∅, 380V, 60Hz or 3∅, 380 - 415V, 50Hz Model Name : ARWB***LAS4

Unit			1 Unit
System Capacity (HP)			8 10 12
Model	Combination Unit		ARWB080LAS4 ARWB100LAS4 ARWB120LAS4
	Independent Unit		ARWB080LAS4 ARWB100LAS4 ARWB120LAS4
Refrigerant Precharged Amount		kg	5.8 5.8 5.8
Maximum Comorbable Number of Incar Units			13 16 20
Net Weight		kg	127 x 1 127 x 1	127 x 1
		lbs	280 x 1 280 x 1	280 x 1
Dimensions(WxHxD)		mm	755 x 997 x 500 755 x 997 x 500 755 x 997 x 500
		inch	26-23/32 x 39-14 x 19-11/16 x 1	29-25/32 x 39-14 x 13-11/16 x 1	29-25/32 x 39-14 x 13-11/16 x 1
Refrigerant Connecting Pipes	Liquid Pipes	mm/incl	9.52(3/8) 9.52(3/8)	12.7(1/2)
	Low Pressure Gas Pipes	mm/incl	22.7(7/8) 22.7(7/8)	25.4(1)
	High Pressure Gas Pipes	mm/incl	19.05(3/4)	19.05(3/4)	19.05(3/4)
Water Connecting Poes	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)	PT20(External thread)
Temp. range of Circulation water	Cooling		10°C ~ 45°C(50°F ~ 113°F)	10°C ~ 45°C(65°F ~ 113°F)	10°C ~ 45°C(50°F ~ 113°F)
	Heating		-5°C ~ 45°C(23°F ~ 113°F)	-5°C ~ 45°C(23°F ~ 113°F)	-5°C ~ 45°C(23°F ~ 113°F)

Unit			1 Unit
System Capacity (HPI)			14	16
Model	Combinaton Unit		ARWB140LAS4	ARWB160LAS4
	Independent Unit		ARWB140LAS4	ARWB160LAS4
Refrigerant: Precharged Amount kg			5.8	3
Maximum Consecable Number of Floor Units			23	26
Net Weight		kg	127 x 1	140 x 1
		lbs	280 x 1	309 x 1
Dimensions(WxHxD)		mm	755 x 997 x 500	755 x 997 x 500
		inch	(29-23)/32 x 39-1/4 x 19-11/16) x 1	(29-23)/32 x 39-1/4 x 19-11/16) x 1
Refrigerant Connecting Ppes	Liquid Pipes	mm/incl	12.7(1/2)	12.7(1/2)
	Low Pressure Gas Pipes	mm/incl	25.4(1)	28.58(1-1/8)
	High Pressure Gas Pipes	mm/incl	19.05(3/4)	19.05(3/4)
Water Connecting Poes	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)
Temp. range of Circulation water	Cooling		10°C ~ 45°C(150°F ~ 113°F)	10°C ~ 45°C(150°F ~ 113°F)
	Heating		-5°C ~ 45°C(123°F ~ 113°F)	-5°C ~ 45°C(123°F ~ 113°F)

Unit			1 Unit
System Capacity (HP)			18	20
Model	Combination Unit		ARWB180LAS4	ARWB200LAS4
	Independant Unit		ARWB180LAS4	ARWB200LAS4
Refrigerant: Precharged Amount		kg	3	3
Maximum Convertible Number of HBox Units			29	32
Net Weight		kg	140 x 1	140 x 1
		lbs	309 x 1	309 x 1
Dimensions(WxHxD)		mm	755 x 997 x 500	755 x 997 x 500
		inch	(29-23/32 x 39-1/4 x 19-11/16) x 1	(29-23/32 x 39-1/4 x 19-11/16) x 1
Refrigerant Connecting Pipes	Liquid Pipes	mm/inch	12.7(1/2)	12.7(1/2)
	Low Pressure Gas Pipes	mm/inch	28.58(1-1/8)	28.58(1-1/8)
	High Pressure Gas Pipes	mm/inch	19.05(3/4)	19.05(3/4)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)
Temp. range of Circulation water	Cooling		10°C ~ 45°C(150°F ~ 113°F)	10°C ~ 45°C(150°F ~ 113°F)
	Heating		-5°C ~ 45°C(123°F ~ 113°F)	-5°C ~ 45°C(123°F ~ 113°F)

Unit			2 Unit
System Capacity (HP)			22 24 26
Model	Combination Unit		ARWB220LAS4	ARWB240LAS4	ARWB260LAS4
	Indecendent Unit		ARWB120LAS4 ARWB120LAS4 ARWB140LAS4
			ARWB100LAS4 ARWB120LAS4 ARWB120LAS4
Refrigerant: Recharged Amount		kg	5.8 + 5.8	5.8 + 5.8	5.8 + 5.8
Maximum Connectable Number of Incar Units			35 39 42
Net Weight		kg	127 x 2 127 x 2	127 x 2
		lbs	280 x 2 280 x 2	280 x 2
Dimensions(WxHxD)		mm	(755 x 997 x 500) x 2	(755 x 997 x 500) x 2	(755 x 997 x 500) x 2
		inch	(29 23/32 x 39 1/4 x 19 11/16) x 2	29 23/32 x 39 1/4 x 19 11/16) x 2	29 23/32 x 39 1/4 x 19 11/16) x 2
Refrigerant Connecting Ppes	Liquid Pipes	mm/incl	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Low Pressure Gas Fps	mm/incl	34.9(1-3/8)	34.9(1-3/8)	34.9(1-3/8)
	High Pressure Gas Fps	mm/incl	28.58(1-1/8)	28.58(1-1/8)	28.58(1-1/8)
Water Connecting Ples	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)	PT20(External thread)
Temp. range of Circulation water	Cooling		10°C ~ 45°C(50°F ~ 113°F)	10°C ~ 45°C(50°F ~ 113°F)	10°C ~ 45°C(50°F ~ 113°F)
	Heating		-5°C ~ 45°C(23°F ~ 113°F)	-5°C ~ 45°C(23°F ~ 113°F)	-5°C ~ 45°C(23°F ~ 113°F)
System Capacity (HP)			28	30	32
Model	Combination Unit		ARWB280LAS4	ARWB300LAS4	ARWB320LAS4
	Independent Unit		ARWB140LAS4	ARWB160LAS4	ARWB180LAS4
			ARWB140LAS4	ARWB140LAS4	ARWB140LAS4
Refrigerant Precharged Amount		kg	5.8 + 5.8	3.0 + 5.8	3.0 + 5.8
Maximum Connectable Number of Indoor Units			45	49	52
Net Weight		kg	127 x 2	(140 x 1) + (127 x 1)	(140 x 1) + (127 x 1)
		lbs	280 x 2	(309 x 1) + (280 x 1)	(309 x 1) + (280 x 1)
Dimensions(WxHxD)		mm	(755 x 997 x 500) x 2	(755 x 997 x 500) x 2	(755 x 997 x 500) x 2
		inch	(29-23)/32 x 39-1/4 x 19-11/16) x 2	(29-23)/32 x 39-1/4 x '9-11/16) x 2	(29-23)/32 x 39-1/4 x '9-11/16) x 2
Refrigerant Connecting Pipes	Liquid Pipes	mm(inch)	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Low Pressure Gas Pipes	mm(inch)	34.9(1-3/8)	34.9(1-3/8)	34.9(1-3/8)
	High Pressure Gas Pipes	mm(inch)	28.58(1-1/8)	28.58(1-1/8)	28.58(1-1/8)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)	PT20(External thread)
Temp range of Circulation water	Cooling		10°C ~ 45°C(60°F ~ 113°F)	10°C ~ 45°C(60°F ~ 113°F)	10°C ~ 45°C(50°F ~ 113°F)
	Heating		-5°C ~ 45°C(23°F ~ 113°F)	-5°C ~ 45°C(23°F ~ 113°F)	-5°C ~ 45°C(23°F ~ 113°F)

Unit			2 Unit
System Capacity (HP)			34 36
Model	Combination Unit		ARWB340LAS4 ARWB360LAS4
	Independent Unit		ARWB200LAS4 ARWB180LAS4
			ARWB140LAS4 ARWB180LAS4
Refrigerant Precharged Amount		kg	3.0 + 5.8 3.0 + 3.0
Maximum Connectable Number of Indoor Units			55 58
Net Weight		kg	(140 × 1) + (127 × 1) 140 × 2
		lbs	(309 × 1) + (280 × 1) 309 × 2
Dimensions(WxHxD)		mm	(755 × 997 × 500) × 2 (755 × 2997 × 500) × 2
		inch	(29-23/32 × 39-1/4 × 19-11/16) × 2
Refrigerant Connecting Pipes	Liquid Pipes	mm[inch]	19.05(3/4) 19.05(3/4)
	Low Pressure Gas Pipes	mm[inch]	34.9(1-3/8) 41.3(1-5/8)
	High Pressure Gas Pipes	mm[inch]	28.58(1-1/8) 34.9(1-3/8)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread) PT40(Internal thread)
	Outlet	mm	PT40(Internal thread) PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread) PT20(External thread)
Temp range of Circulation water	Cooling		10^ 45^(50^ 113^) 10^ 45^(50^ 113^)
	Heating		-5^ 45^(23^ 113^) -5^ 45^(23^ 113^)

Unit			2 Unit
System Capacity (HP)			38 40
Model	Combination Unit		ARWB380LAS4 ARWB400LAS4
	Independent Unit		ARWB200LAS4 ARWB200LAS4
			ARWB180LAS4 ARWB200LAS4
Refrigerant Precharged Amount		kg	3.0 + 3.0 3.0 + 3.0
Maximum Connectable Number of Indoor Units			61 64
Net Weight		kg	140 × 2 140 × 2
		lbs	309 × 2 309 × 2
Dimensions(WxHxD)		mm	(755 × 997 × 500) × 2 (755 × 997 × 500) × 2
		inch	(29-23/32 × 39-1/4 × 19-11/16) × 2 (29-23/32 × 39-1/4 × 19-11/16) × 2
Refrigerant Connecting Pipes	Liquid Pipes	mm[inch]	19.05(3/4) 19.05(3/4)
	Low Pressure Gas Pipes	mm[inch]	41.3(1-5/8)	41.3(1-5/8)
	High Pressure Gas Pipes	mm[inch]	34.9(1-3/8)	34.9(1-3/8)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread) PT40(Internal thread)
	Outlet	mm	PT40(Internal thread) PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread) PT20(External thread)
Temp range of Circulation water	Cooling		10^ 45^(50^ 113^) 10^ 45^(50^ 113^)
	Heating		-5^ 45^(23^ 113^) -5^ 45^(23^ 113^)

Unit			3 Unit
System Capacity (HP)			42	44	46
Model	Combination Unit		ARWB420LAS4	ARWB440LAS4	ARWB460LAS4
	Independent Unit		ARWB200LAS4	ARWB200LAS4	ARWB200LAS4
			ARWB120LAS4	ARWB120LAS4	ARWB140LAS4
			ARWB100LAS4	ARWB120LAS4	ARWB120LAS4
Refrigerant Precharged Amount		kg	3.0 + 5.8 + 5.8	3.0 + 5.8 + 5.8	3.0 + 5.8 + 5.8
Maximum Connectable Number of Indoor Units			64	64	64
Net Weight		kg	140 × 1 + 127 × 2 140 ×	1 + 127 × 2 140 × 1 + 127 × 2
		lbs	309 × 1 + 260 × 2 309 ×	1 + 260 × 2 309 × 1 - 260 × 2
Dimensions(WxHxD)		mm	755 × 997 × 500 × 3	755 × 997 × 500) × 3	755 × 997 × 500 × 3
		inch	29.23/52 × 39.14 × 19.11/161 × 3	29.23/32 × 39.14 × 19.11/161 × 3	29.23/32 × 39.14 × 19.11/161 × 3
Refrigerant Connecting Pipes	Liquid Pipes	mm[inch]	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Low Pressure Gas Pipes	mm[inch]	41.3(1-5/8)	41.3(1-5/8)	41.3(1-5/8)
	High Pressure Gas Pipes	mm[inch]	34.9(1-3/8)	34.9(1-3/8)	34.9(1-3/8)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)	PT20(External thread)
Temp range of Circulation water	Cooling		10^ C - 45^ C160^ F - 113^ F	10^ C - 45^ C160^ F - 113^ F	10^ C - 45^ C160^ F - 113^
	Heating		- 5^ C - 45^ C( 23^ F - 113^ F)	- 5^ C - 45^ C( 23^ F - 113^ F)	- 5^ C - 45^ C160^ F - 113^

Unit			3 Unit
System Capacity (HP)			48	50	52
Model	Combination Unit		ARWB480LAS4	ARWB500LAS4	ARWB520LAS4
	Independent Unit		ARWB200LAS4	ARWB200LAS4	ARWB200LAS4
			ARWB140LAS4	ARWB160LAS4	ARWB180LAS4
			ARWB140LAS4	ARWB140LAS4	ARWB140LAS4
Refrigerant Precharged Amount		kg	3.0 + 5.8 + 5.8	3.0 + 3.0 + 5.8	3.0 + 3.0 + 5.8
Maximum Connectable Number of Indoor Units			64	64	64
Net Weight		kg	(140 × 1) + (127 × 2)	(140 × 2) + (127 × 1)	(140 × 2) + (127 × 1)
		lbs	(309 × 1) + (280 × 2)	(309 × 2) + (280 × 1)	(309 × 2) + (280 × 1)
Dimensions(WxHxD)		mm	(755 × 997 × 500) × 3	(755 × 997 × 500) × 3	(755 × 997 × 500) × 3
		inch	(29-23/32 × 39-1/4 × 19-11/16) × 3	(29-23/32 × 39-1/4 × 15-11/16) × 3	(29-23/32 × 39-1/4 × 19-11/16) × 3
Refrigerant Connecting Pipes	Liquid Pipes	mm/inch	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Low Pressure Gas Pipes	mm/inch	41.3(1-5/8)	41.3(1-5/8)	41.3(1-5/8)
	High Pressure Gas Pipes	mm/inch	34.9(1-3/8)	34.9(1-3/8)	34.9(1-3/8)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)	PT20(External thread)
Temp. range of Circulation water	Cooling		10°C - 45°C(150°F - 113°F)	10°C - 45°C(50°F - 113°F)	10°C - 45°C(50°F - 113°F)
	Heating		-5°C - 45°C(23°F - 113°F)	-5°C - 45°C(23°F - 113°F)	-5°C - 45°C(23°F - 113°F)

Unit			3 Unit
System Capacity (IHP)			54 56
Model	Combination Unit		ARWB540LAS4 ARWB560LAS4
	Independent Unit		ARWB200LAS4 ARWB200LAS4
			ARWB200LAS4 ARWB180LAS4
			ARWB140LAS4 ARWB180LAS4
Refrigerant Pracharged Amount		kg	3.0 + 3.0 + 5.8	3.0 + 3.0 + 3.0
Maximum Connectable Number of Indoor Units			64 64
Net Weight		kg	(140 × 2) + (127 × 1) 140 × 3
		lbs	(309 × 2) + (280 × 1) 309 × 3
Dimensions(WxHxD)		mm	(755 × 997 × 500) × 3 (755 × 997 × 500) × 3
		inch	(29-23/32 × 39-1/4 × 19-11/16) × 3 (29-23/32 × 39-1/4 × 19-11/16) × 3
Refrigerant Connecting Pipes	Liquid Pipes	mm/inch	19.05(3/4)	19.05(3/4)
	Low Pressure Gas Pipes	mm/inch	41.3(1-5/8)	41.3(1-5/8)
	High Pressure Gas Pipes	mm/inch	34.9(1-3/8)	34.9(1-3/8)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread) PT40(Internal thread)
	Outlet	mm	PT40(Internal thread) PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread) PT20(External thread)
Temp range of Circulation water	Cooling		10^ 45^(50^ 113^) 10^ 45^(50^ 113^)
	Heating		-5^ 45^(23^ 113^) -5^ 45^(23^ 113^)

Unit			3 Unit
System Capacity (IHP)			58 60
Model	Combination Unit		ARWB580LAS4 ARWB600LAS4
	Independent Unit		ARWB200LAS4 ARWB200LAS4
			ARWB200LAS4 ARWB200LAS4
			ARWB180LAS4 ARWB200LAS4
Refrigerant Precharged Amount		kg	3.0 + 3.0 + 3.0	3.0 + 3.0 + 3.0
Maximum Connectable Number of Indoor Units			64 64
Net Weight		kg	140 × 3 140 × 3
		lbs	309 × 3 309 × 3
Dimensions(WxHxD)		mm	(755 × 997 × 500) × 3(755 × 997 × 500) × 3
		inch	(29-23/32 × 39-1/4 × 19-11/16) × 3
Refrigerant Connecting Pipes	Liquid Pipes	mm/inch	19.05(3/4)	19.05(3/4)
	Low Pressure Gas Pipes	mm/inch	41.3(1-5/8)	41.3(1-5/8)
	High Pressure Gas Pipes	mm/inch	34.9(1-3/8)	34.9(1-3/8)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread) PT40(Internal thread)
	Outlet	mm	PT40(Internal thread) PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread) PT20(External thread)
Temp range of Circulation water	Cooling		10^ 45^(150^ 113^) 10^ 45^(150^ 113^)
	Heating		-5^ 45^(23^ 113^) -5^ 45^(23^ 113^)

Unit			4 Unit
System Capacity (HP)			62	64	66
Model	Combination Unit		ARWB620LAS4	ARWB640LAS4	ARWB660LAS4
	Independent Unit		ARWB200LAS4	ARWB200LAS4	ARWB200LAS4
			ARWB200LAS4	ARWB200LAS4	ARWB200LAS4
			ARWB120LAS4	ARWB120LAS4	ARWB140LAS4
			ARWB100LAS4	ARWB120LAS4	ARWB120LAS4
Refrigerant Procharged Amount		kg	3.0 + 3.0 + 5.8 + 5.8	3.0 + 3.0 + 5.8 + 5.8	3.0 + 3.0 + 5.8 + 5.8
Maximum Connectable Number of Indoor Units			64	64	64
Net Weight		kg	( 140 × 2) + ( 127 × 2)	( 140 × 2) + ( 127 × 2)	( 140 × 2) + ( 127 × 2)
		Ics	( 309 × 2 + ( 280 × 2) )	( 309 × 2) + ( 280 × 2)	( 309 × 2 + ( 250 × 2) )
Dimensions(WxHxD)		mm	( 755 × 997 × 500) × 4	755 × 997 × 500) × 4	( 755 × 997 × 500) × 4
		inch	( 29 - 23/32 × 39 - 14 × 19 - 11^ 6) × 4	29 - 23/32 × 15 - 14 × 15 - 11 /18 × 4	( 29 - 23/32 × 39 - 14 × 19 - 11 /16) × 4
Refrigerant Connecting Pipes	Liquid Pipes	mm/inch	22.2(7/8)	22.2(7/8)	22.2(7/8)
	Low-Pressure Gas Pipes	mm/inch	44.5(1-3/4)	44.5(1-3/4)	53.98(2-1/8)
	High-Pressure Gas Pipes	mm/inch	41.3(1-5/8)	41.3(1-5/8)	44.5(1-3/4)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)	PT20(External thread)
Temp range of Circulation water	Cooling		10^ C - 45^ C( 50^ F) - 113^ F	10^ C - 45^ C( 50^ F) - 114^ F	10^ C - 45^ C( 50^ F) - 115^ F
	Heating		- 5^ C 45^ C0.3^ F 113^ F	- 5^ C 45^ C0.3^ F 114^ F	- 5^ C 45^ C0.3^ F 115^ F
System Capacity (HP)			68 70 72
Model	Combination Unit		ARWB680LAS4 ARWB700LAS4 ARWB720LAS4
	Independent Unit		ARWB200LAS4 ARWB200LAS4 ARWB200LAS4
			ARWB200LAS4 ARWB200LAS4 ARWB200LAS4
			ARWB140LAS4 ARWB160LAS4 ARWB180LAS4
			ARWB140LAS4 ARWB140LAS4 ARWB140LAS4
Refrigerant Pracharged Amount		kg	3.0 + 3.0 + 5.8 + 5.8	3.0 + 3.0 + 3.0 + 5.8	3.0 + 3.0 + 3.0 + 5.8
Maximum Connectable Number of Indoor Units			64 64 64
Net Weight		kg	(140 x 2) + (127 x 2)	(140 x 3) + (127 x 1)	(140 x 3) + (127 x 1)
		los	(309 x 2) + (280 x 2)	(309 x 3) + (280 x 1)	(309 x 3) + (280 x 1)
Dimensions(WxHxD)		mm	(755 x 997 x 500) x 4	(755 x 997 x 500) x 4	(755 x 997 x 500) x 4
		inch	(29-23/02 x 39-1/4 x 19-11/16) x 4	(29-23/02 x 39-1/4 x 18-11/16) x 4	(29-23/02 x 39-1/4 x 19-11/16) x 4
Refrigerant Connecting Pipes	Liquid Pipes	r/minch	22.2(7/8)	22.2(7/8)	22.2(7/8)
	Low Pressure Gas Pipes	r/minch	53.98(2-1/8)	53.98(2-1/8)	53.98(2-1/8)
	High Pressure Gas Pipes	r/minch	44.5(1-3/4)	44.5(1-3/4)	44.5(1-3/4)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Outlet	mm	PT40(Internal thread)	PT40(Internal thread)	PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread)	PT20(External thread)	PT20(External thread)
Temp range of Circulation water	Cooling		10°C - 45°C(50°F ~ 116°F)	10°C - 45°C(50°F ~ 117°F)	0°C ~ 45°C(50°F ~ 118°F)
	Heating		-5°C ~ 45°C(23°F ~ 118°F)	-5°C ~ 45°C(23°F ~ 117°F)	-5°C ~ 45°C(23°F ~ 118°F)

Unit			4 Unit
System Capacity (HP)			74 76
Model	Combination Unit		ARWB740LAS4 ARWB760LAS4
	Independent Unit		ARWB200LAS4 ARWB200LAS4
			ARWB200LAS4 ARWB200LAS4
			ARWB200LAS4 ARWB180LAS4
			ARWB140LAS4 ARWB180LAS4
Refrigerant Precamped Amount		kg	3.0 + 3.0 + 3.0 + 5.8 3.0 + 3	0 + 3.0 + 3.0
Maximum Connectable Number of Indoor Units			64 64
Net Weight		kg	(140 x 3) + (127 x 1) 140 x 4
		Ics	(309 x 3) + (280 x 1) 309 x 4
Dimensions(WxHxD)		mm	(755 x 997 x 500) x 4 (755 x 997 x 500) x 4
		inch	(29-23/32 x 39-1/4 x 19-11/16) x 4	(29-23/32 x 39-1/4 x 19-11/16) x 4
Refrigerant Connecting Pipes	Liquid Pipes	mm/incht	22.2(7/8) 22.2(7/8)
	Low Pressure Gas Pipes	mm/incht	53.98(2-1/8) 53.98(2-1/8)
	High Pressure Gas Pipes	mm/incht	44.5(1-3/4) 44.5(1-3/4)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread) PT40(Internal thread)
	Outlet	mm	PT40(Internal thread) PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread) PT20(External thread)
Temp. range of Circulation water	Cooling		10°C ~ 45°C(50°F ~ 119°F) 10°C ~ 45°C(50°F ~ 120°F)
	Heating		-5°C ~ 45°C(23°F ~ 119°F) -5°C ~ 45°C(23°F ~ 120°F)

Unit			4 Unit
System Capacity (HP)			78 80
Model	Combination Unit		ARWB780LAS4 ARWB800LAS4
	Independent Unit		ARWB200LAS4 ARWB200LAS4
			ARWB200LAS4 ARWB200LAS4
			ARWB200LAS4 ARWB200LAS4
			ARWB180LAS4 ARWB200LAS4
Refrigerant Precargad Amount:		kg	3.0 + 3.0 + 3.0 + 3.0 3.0 + 3	0 + 3.0 + 3.0
Maximum Connectable Number of Indicator Units			64 64
Net Weight		kg	140 x 4 140 x 4
		Ibs	309 x 4 309 x 4
Dimensions(WxHxD)		mm	(755 x 997 x 500) x 4 (755 x 997 x 500) x 4
		inch	(29-23/32 x 39-1/4 x 19-11/16) x 4	(29-23/32 x 39-1/4 x 19-11/16) x 4
Refrigerant Connecting Pipes	Liquid Pipes	mm/inch	22.2(7/8) 22.2(7/8)
	Low Pressure Gas Pipes	mm/inch	53.98(2-1/8) 53.98(2-1/8)
	High Pressure Gas Pipes	mm/inch	44.5(1-3/4) 44.5(1-3/4)
Water Connecting Pipes	Inlet	mm	PT40(Internal thread) PT40(Internal thread)
	Outlet	mm	PT40(Internal thread) PT40(Internal thread)
	Drain Outlet	mm	PT20(External thread) PT20(External thread)
Temp. range of Circulation water	Cooling		10°C - 45°C(50°F - 121°F) 10°C - 45°C(50°F - 122°F)
	Heating		-5°C - 45°C(23°F - 121°F) -5°C - 45°C(23°F - 122°F)

ALTERNATIVE REFRIGERANT R410A

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 characteristic 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.

! 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.

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

• With strength which bears weight of unit
• With space for air passage and service work Don't install the unit at the space where generation, inflow, stagnation, and leak of combustible gas is expected.
• Avoid unit installation in a place where acidic solution and spray (sulfur) are often used.
• Location with no leakage of combustible gas
• Recommend the outside unit to be installed within 0\~40°C.
• Location with installation or service work space (Refer to required space)
• Do not use the outside unit under any special environment where oil, steam and sulfuric gas exist.
• Install in a separate machine room not exposed to external air Establish an anti-freeze plan for the water supply when the product is stopped during the winter.

Install the product so that the noise from the machine room is not transferred outsides

• The floor of the machine room must be water proof.
• Drainage must be installed in the machine room to process the water drainage.
• Install a floor slope to make the drainage smooth.
• Avoid installing the outside unit in the location with following conditions.
• Location where corrosive gas such as acidic gas is generated. (It may cause the refrigerant leakage by corrosion of the pipe.)
• Location where electromagnetic waves happen. (It may cause the abnormal operation by control parts disorder.)
• Location to be able to leak the combustible gas
• Location with carbon fiber or combustible dust.
• Location with the combustible material like thinner or gasoline. (It may cause a fire by leaking the gas near the product.)

CAUTION

• Do not install Multi V water outdoors. Always install indoor like machine room.
• Inverter product may generate electric noise. Keep the body from computer, stereo etc. at enough distance. Specially leave space from indoor remote controller to shoes electric devices at the above 3m in weak electric wave area. Insert the power cable and other wire into separate conduit.

Select installation location of the HR unit suitable for following conditions

• Avoid a place where rain may enter since the HR unit is for indoor.
• Sufficient service space must be obtained.
• Refrigerant pipe must not exceed limited length.
• Avoid a place subject to a strong radiation heat from other heat source.
• Avoid a place where oil spattering, vapor spray or high frequency electric noise is expected.
• Install the unit at a place in which it is not affected by operation noise. (Installation within cell such as meeting room etc. may disturb business due to noise.)
• Place where refrigerant piping, drain piping and electrical wiring works are easy.

481 345 450 450 ⑦ ① ② ③ Inspection door (servicing space)

218 453(174) (174) 182

100 more (Servicing space) 300more (Servicing space) 300more (Servicing space)

100 more (Servicing space) 300more (Servicing space) 450more (Servicing space)

124 128 41961 (137) 30 60 ④ ⑤ ⑥

(Unit: mm)

No.	Part Name	Description
		PRHR041/031 PRHR021
1	Low pressure Gas pipe connection port	∅28.58 Brazing connection	∅22.2 Brazing connection
2	High pressure Gas pipe connection port	∅22.2 Brazing connection	∅19.05 Brazing connection
3	Liquid pipe connection port	∅15.88 Brazing connection(PRHR041)	∅9.52 Brazing connection
		∅12.7 Brazing connection(PRHR031)
4	Indoor unit Gas pipe connection port	∅15.88 Brazing connection	∅15.88 Brazing connection
5	Indoor unit Liquid pipe connection port	∅9.52 Brazing connection	∅9.52 Brazing connection
6	Control box --
7	Hanger metal M10 or M8	M8 M10 or M8

NOTE

• Be sure to install the inspection door at the control box side.
• If reducers are used, servicing space must be increased equal to reducer's dimension.

INSTALLATION SPACE

Individual Installation Water control

During the installation of the unit, consider service, inlet, and outlet acquire the minimum space as shown in the figures below.

: Service area

Water pipe installation space Product (Outside unit) Service area (Front) 350 20 755 100 600 500 NO

(unit : mm) H-Beam Support 100 100997

Collective / Continuous Installation

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

: Service area

Product (Outside unit) Service area (Front) Product (Outside unit) Service area (Front) Product (Outside unit) Service area (Front) Product (Outside unit) Service area (Front) 20 755 100 755 100 755 100 755 100 20 600 500

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

Two Layer Installation

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

: Service area

(unit : mm) 997 100 100 997 H-Beam Support 100

WATER CONTROL

- Keep the water temperature between 10\~45°C. Other it may cause the breakdown.

Standard water supply temperature is 30^ C for Cooling and 20^ C 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.

Diameter (mm) Velocity range (m/s)
< 50 0.6 ~ 1.2
50 ~ 100 1.2 ~ 2.1
100 < 2.1 ~ 2.7

• 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, 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.

Anti freeze type	Minimum temperature for anti freezing (°C)
	0 -5	10 -15	20 -25
Ethylene glycol (%)	0	12 20	30 -	-
Propylene glycol (%)	0	17 25	33 -	-
Methanol (%)	0 6	12	16 24 30

• 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 2nd heat exchanger to make the water supply system a closed type system.

Standard table for water purity control

The water may contain many foreign substances and hence may influence the performance and lifetime of the product 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 performance deterioration to the air conditioner and severe problem to the product

Items	Closed type		Effect
	Circulating water Supplemented water Corrosion Scale
Basic Item
pH(25C)	7.0-8.0	7.0-8.0	O	O
Conductivity[25C](mS/m)	Below 30	Below 30	O	O
Chlorine ion(mg Cl−/l)	Below 50	Below 50	O	-
Sulfuric acid ion(mg SO4−/l)	Below 50	Below 50	O	O
Acid demand[pH 4.8] (mg SiO2/l)	Below 50	Below 50	-	O
Total hardness(mg SiO2/l)	Below 70	Below 70	-	O
Ca hardness(mg CaCO3/l)	Below 50	Below 50	-	O
Ion silica(mg SiO2/l)	Below 30	Below 30	-	O
Reference Item
Fe(mg Fe/l)	Below 1.0	Below 0.3	O	O
Copper(mg Cu/l)	Below 1.0	Below 0.1	O	-
Sulfuric acid ion(mg Sf/l)	Must not be detected	Must not be detected	O	-
Ammonium ion(mg NH4+/l)	Below 0.3	Below 0.1	O	-
Residual chlorine(mg Cl/l)	Below 0.25	Below 0.3	O	-
Free carbon dioxide(mg CO2/l)	Below 0.4	Below 4.0	O	-
Stability index	-	-	O	O

Reference

• The "O" mark for corrosion and scale means that there is possibility of occurrence.
• When the water temperature is 40^ or above or when uncoated iron is exposed to the water, it can result in corrosion. Therefore adding anti-corrosion agent or removing the air can be very effective.
• In case of using the closed type cooling tower, the cooling water and supplementing water must satisfy the water quality criteria of closed type system in the table.
• Supplementing water and supplied water must be supplied with tap water, industrial water and underground water excluding filtered water, neutral water, soft water etc.
• 15 items in the table are general causes of corrosion and scale.

LIFTING METHOD

• When carrying the unit suspended, 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 fours points so that impact is not applied to the unit.
• Attach the ropes to the unit at an angle of 40^ or less

Sub line A 40° or less

A 40° or less B Rope supporter

Isometric line drawing of a metal enclosure with a hanging frame and internal compartments (no text or symbols)

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 means for transportation because they are dangerous.
• Tear the plastic packaging bag and scrap it so that children cannot play with it.

Otherwise plastic packaging bag may suffocate children.

• 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 of it.
• 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.

INSTALLATION

• Install at places where it can endure the weight and vibration/noise of the outside unit.
• The outside unit supports at the bottom shall have width of at least 100mm under the Unit's legs before being fixed.
• The outside unit supports should have minimum height of 200mm.
• Anchor bolts must be inserted at least 75mm.

(no text)

O

at least 100mm at 100mm

O

O

At least 100mm least 100mm

The location of the Anchor bolts

Foundation for Installation

• Fix the unit tightly with bolts as shown below so that unit will not fall down due to earthquake or gust.
• Use the H-beam support as a base support
• Noise and vibration may occur from the floor or wall since vibration is transferred through the installation part depending on installation status. Thus, use anti-vibration materials (cushion pad) fully (The base pad shall be more than 200mm).

At least 200mm

Technical diagram showing labeled mechanical components with numbered parts E, F, D, and C

Ⓐ The corner part must be fixed firmly. Otherwise, the support for the installation may be bent.
⑧ Get and use M10 Anchor bolt.
© Put Cushion Pad between the outside unit and ground support for the vibration protection in wide area.
⑭ Space for pipes and wiring (Pipes and wirings for bottom side)
© H-beam support
⑤ Concrete support

Unit : mm 75 100 200 75 200

WARNING

• Install where it can sufficiently support the weight of the outside unit.
If the support strength is not enough, the outside unit may drop and hurt people.
- Install where the outside unit may not fall in strong wind or earthquake. If there is a fault in the supporting conditions, the outside unit may fall and hurt people.
- Please take extra cautions on the supporting strength of the ground, water outlet treatment(treatment of the water flowing out of the outside unit in operation), and the passages of the pipe and wiring, when making the ground support.
- Do not use tube or pipe for water outlet in the Base pan. Use drainage instead for water outlet. The tube or pipe may freeze and the water may not be drained.

! CAUTION

• Be sure to remove the Pallet(Wood Support) of the bottom side of the outside unit Base Pan before fixing the bolt. It may cause the unstable state of the outdoor settlement, and may cause freezing of the heat exchanger resulting in abnormal operations.
• Be sure to remove the Pallet(Wood Support) of the bottom side of the outside unit before welding. Not removing Pallet(Wood Support) causes hazard of fire during welding.

Pallet(Wood Support) - Remove before Installation

Preparation of Piping

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

Cut the pipes and the cable

• Use the accessory piping kit or the pipes purchased locally.
• Measure the distance between the indoor and the outside unit.
• Cut the pipes a little longer than measured distance.
• Cut the cable 1.5m longer than the pipe length.

Copper tube 90° Slanted Uneven Rough Point down Pipe Reamer

Burrs removal

• Completely remove all burrs from the cut cross section of pipe/tube.
• Put the end of the copper tube/pipe to downward direction as you remove burrs in order to avoid to let burrs drop in the tubing.

Bar "Copper pipe" "A" Handle Bar Yoke Cone Clamp handle Red arrow mark

Flaring work

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

Indoor unit [kW(Btu/h)]	Pipe "A"
	Gas Liquid Gas Liquid
<5.6(19,100) 1/2" 1/4" 0.5~0.8 0-0.5
<16.0(54,600) 5/8" 3/8" 0.8~1.0 0 5~0.8
<22.4(76,400) 3/4" 3/8" 1.0~1.3 0 5~0.8

Firmly hold copper tube in a bar(or die) as indicated dimension in the table above.

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.

Smooth all round Inside is shining without scratches. Even length all round = Improper flaring = Inclined Surface Cracked Uneven thickness

Flare shape and flare nut tightening torque

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.

Pipe size	Tightening torque(N m)	A(mm) Flare shape
9.52 38 ± 4	12.8-13.2
12.7 55 ± 6	16.2-16.6
15.88 75 ± 7	19.3-19.7

! 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 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

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

Closing shutoff valve

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

Tightening torque

Shutoff valve size	Tightening torque N m(Turn clockwise to close)
	Shaft (valve body)			Cap (Valve lid)	Service port	Flare nut	Gas line piping attached to unit
	Closed Opened		Hexagonal wrench
∅6.35	6.0±0.638±4	2.0 55±65.0±0.010mm-	4mm	17.6±2.0	12.7±2	16±2	-
∅9.52
∅12.7	10.0±1.0 20.0
∅15.88	2.0±1.2		5mm	25.0±2.5		75±7
∅19.05	4.0±1.4 110
∅22.2	30.0±3.0 8mm-
∅25.4 25±3

Heat insulation

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 temperature: 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.

Fastening band (accessory) Refrigerant piping Thermal insulator (accessory) Indoor unit

3 Standard refrigerant pipe EPDM heat insulation material thickness.

Classification		Air conditioned location		Non-air conditioned location
		^1035 General location	^1035 Special location	^1035 General location	^1035 Negative condition
Liquid pipe	∅6.35	Above t9 Above t9 Above t9 Above t9
	∅9.52
	Above ∅12.7	Above t13 Above t13 Above t13 Above t13
Gas pipe	∅9.52	Above t13	Above t19 Above t19		Above t25
	∅12.7
	∅15.88
	∅19.05
	∅22.22
	∅25.4
	∅28.58	Above t19
	∅31.75		Above t25 Above t25
	∅34.9
	∅38.1
	∅44.45

Note 1) General location: When the pipe passes through indoors in which the indoor unit is operated

- Apartment, classroom, office, mall, hospital, office-tel etc.

Note 2) Special location

1 When the location is air conditioned but has severe temperature/humidity difference due to high ceiling - Church, auditorium, theater, lobby etc.
2 When the location is air conditioned but the internal temperature/humidity of the ceiling finishing is high - Bathroom/swimming pool locker room etc. (Building with roof ceiling of sandwich assembly type)

Note 3) General location: When the pipe passes indoors where the indoor unit is not operated

- Hall way etc. (Dormitory, school, office-tel)

Note 4) Negative condition: When below conditions 1 and 2 are met.

1 When the pipe passes indoors where the indoor unit is not operated
2 When the humidity is high, regionally, and there is no air flow in the pipe passing area

• When installing the outside unit within the outside pipe tray or at a location where it is ok to have freezes, apply 13t.
• If you are not sure with the selection of heat insulation material, coordinate with the supervision or HO.
• The thickness of the above heat insulation material is based on the heat conductivity of 0.088W/m°C.

Plumbing materials and storage methods

Pipe must be able to obtain the specified thickness and should be used with low impurities.

Also when handling storage, pipe must be careful to prevent a fracture, deformity and wound.

Should not be mixed with contaminations such as dust, moisture.

Two groups of sticks: one with circles and one with crosses, no text or symbols present.

Refrigerant piping on three principles

	Drying	Cleanliness	Airtight
	Should be no moisture inside	No dust inside.	There is no refrigerant leakage
Items
Cause failure	- Significant hydrolysis of refrigerant oil- Degradation of refrigerant oil- Poor insula'tion of the compressor- Do not cold and warm- Clogging of EEV, Capillary	- Degradation of refrigerant oil- Poor insulation of the compressor- Do not cold and warm- Clogging of EEV, Capillary	- Gas shortages- Degradation of refrigerant oil- Poor insulation of the compressor- Do not cold and warm
Countermeasure	- No moisture in the pipe- Until the connection is completed, the plumbing pipe entrance should be strictly controlled.- Stop plumbing at rainy day.- Pipe entrance should be taken side or bottom.- When removal burr after cutting pipe, pipe entrance should be taken down.- Pipe entrance should be fitted cap when pass through the walls.	- No dust in the pipe.- Until the connection is completed, the plumbing pipe entrance should be strictly controlled.- Pipe entrance should be taken side or bottom.- When removal burr after cutting pipe, pipe entrance should be taken down.- Pipe entrance should be fitted cap when pass through the walls.	- Airtightness test should be.- Brazing operations to comply with standards.- Flare to comply with standards.- Flange connections to comply with standards.

Nitrogen substitution method

Welding, as when heating without nitrogen substitution a large amount of the oxide film is formed on the internal piping.

The oxide film is a caused by clogging EEV, Capillary, oil hole of accumulator and suction hole of oil pump in compressor.

It prevents normal operation of the compressor.

In order to avoid this problem, Welding should be done after replacing air by nitrogen gas.

When welding plumbing pipe, the work is required.

Welding Point Regulator Nitrogen gas Pressure 0.02MPa less Oxide scale Note) should not block the outlet side. When the internal pressure in pipe is above the atmospheric pressure, pinhole is occurred and it is a leakage cause. Taping (Should not contain air) Auxiliary valve Nitrogen

! CAUTION

• Always use the nitrogen.(not use oxygen, carbon dioxide, and a Chevron gas): Please use the following nitrogen pressure 0.02MPa Oxygen - Promotes oxidative degradation of refrigerant oil. Because it is flammable, it is strictly prohibited to use Carbon dioxide - Degrade the drying characteristics of gas Chevron Gas - Toxic gas occurs when exposed to direct flame.
  • Always use a pressure reducing valve.
• Please do not use commercially available antioxidant. The residual material seems to be the oxide scale is observed. In fact, due to the organic acids generated by oxidation of the alcohol contained in the anti-oxidants, ants nest corrosion occurs. (causes of organic acid alcohol + copper + water + temperature)

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 refrigerant piping has been completed.

Cautions in pipe connection/valve operation

Open status when both the pipe and in a straight line. Cut both the pipe and the val suit the length (Don't cut the length of less t CLOSE OPEN

! WARNING

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

Ball Valve (Liquid Pipe) Elbow Ball Valve(Gas Pipe)

① Pipe joint (auxiliary parts): Securely perform brazing with a nitrogen blow into the service port.(Releasing pressure : 0.02 MPa or less)
② Cap: Remove caps and operate valve, etc. After operation, always reattach caps (tightening torque of valve cap: 25Nm (250kg-cm) or more). (Don't remove the internal part of the port)
③ 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).
④ Liquid pipe
⑤ Gas pipe
⑥ Elbow joint (field supply)

*Remove the front panel before pipe connection
*Must check the pipe (liquid pipe, low pressure gas pipe, high pressure gas pipe) before pipe connection

Liquid pipe Low pressure gas pipe High pressure gas pipe

Connection of Outside units

Outside units		Model	Low Pressure Gas Pipe	Liquid Pipe	High Pressure Gas Pipe
2 Unit		ARCNN21
3 Unit		ARCNN31
4 Unit		ARCNN41

* Install the branch pipe between outside units so that the outlet pipe is parallel to the surface.

Y branch A To outside unit B Within +/- 10 Viewed from point A in direction of arrow C To branch niging as index unit

Facing downwards Facing upwards Within ± 3° Within ± 3°

!CAUTION

When installing the branch pipe vertically between the outside units, the refrigerant can be uneven between the outside units, leading to compressor burn and reduced capacity.

Installation procedure for HR unit

1 Using an insert-hole-in-anchor, hang the hanging bolt.
2 Install a hexagon nut and a flat washer (locally-procured) to the hanging bolt as shown in the figure in the bottom, and fit the main unit to hang on the hanger metal.
3 After checking with a level that the unit is level, tighten the hexagon nut. * The tilt of the unit should be within ±5^ in front/back and left/right.
4 This unit should be installed suspended from ceiling and side A should always be facing up.
5 Insulate not used pipes completely as shown in the figure.

Six-sided Nut (M10 or M8) Hanger metal Flat washer (M10) Hanging bolt (M10 or M8)

Installation of Outside Unit, HR Unit, Indoor Unit Refrigerant Pipe

3 pipes are connected to the HR unit from the outside unit, classified into liquid pipe, low pressure gas pipe and high pressure gas pipe depending on status of refrigerant passing through the pipe.

You must connect 3 pipes from outside unit to HR unit.

For connection between indoor unit and HR unit, you must connect both liquid pipe and gas pipe from the HR unit to the indoor unit. In this case, connect them to the indoor unit starting from No.1 connection port of the HR unit (the port number is displayed on ports of the HR unit). Use auxiliary flare as annexed parts in connection to the indoor unit.

Liquid pipe Low pressure Gas pipe High pressure Gas pipe HR Unit Gas pipe Liquid pipe Gas pipe Liquid pipe

! CAUTION

Whenever connecting the indoor units with the HR unit, install the indoor units in numerical order from No.1.

Ex) In case of installing 3 indoor units: No. 1, 2, 3 (O), No. 1, 2, 4 (X), No. 1, 3, 4 (X), No. 2, 3, 4 (X).

Type of HR Unit

Select an HR unit according to the number of the indoor units to be installed. HR units are classified into 3 types by the number of connectable indoor units.

Ex) Installation of 6 indoor units

Consists of HR unit for 4 branches and HR unit for 2 branches.

Two identical schematic diagrams of a rectangular electronic component with pins and terminals, labeled ①, ②, ③ (no text or symbols on the components themselves)

Technical line drawing of a rectangular electronic component with four pins (labeled 1 to 4), no text or symbols present.

PRHR041(4 branches)

Joint Method of HR Unit (Big Duct : ARNU76GB8-, ARNU96GB8-)

Joint Method is required when B5/B8 chassis is installed. In Joint Method, two neighboring outlets of one HR unit are linked by Y branch pipe and connected to one indoor unit.

1st HR Unit 2 nd HR Unit 1 2 3 4 B8 BG (96k) (28k) 1 2 B 4 BH B8 (21k) (76k)

Liquid pipe Low pressure gas pipe High pressure gas pipe Remove caps on The brazing part. Gas pipe Ø15.88 (5/8) Liquid pipe Ø9.52 (3/8) Brazing Type

HR unit PRHR021 PRHR031 PRHR041
Low pressure gas pipe	∅22.2 ∅28.58 ∅28.58
High pressure gas pipe	∅19.05 ∅22.2 ∅22.2
Liquid pipe ∅9.52 ∅12.7 ∅15.88

Installation of Zoning Control

Some indoor unit can be connected to one port of HR unit.

graph TD
    A["HR unit HR unit"] --> B["Zoning control group 1"]
    A --> C["Zoning control group 2"]
    B --> D["(Max. 8 Indoor Units)"]
    C --> E["(Max. 8 Indoor Units)"]
    D --> F["Changeover under control"]
    E --> G["Changeover under control"]
    F --> H["Auto changeover Changeover"]
    G --> I["Auto changeover"]

WARNING

• A branch pipe of HR unit allows up to 14.1kW based on cooling capacity of the indoor unit. (up to 14.1kW (48kBtu/h) for max installation)
• The maximum total capacity of indoor units connected to a PRHR041 HR unit is 56.4kW (192 kBtu/h).
• The maximum number of indoor units connected to a PRHR041 HR unit are 32 indoor units. (The Maximum indoor units per a branch pipe of HR unit are 8 indoor units)
• There is not operate "Auto-changeover" & "Mode override" function in the zoning group.
• When there are operating indoor units on cooling(heating) mode, another indoor units aren't changed on heating(cooling) mode in the zoning group.

[Reducers for indoor unit and HR unit]

(Unit : mm)

Models		Liquid pipe	Gas pipe
			High pressure	Low pressure
Indoor unit reducer		A-0096208	-
HR unit reducer	PR-HR021A		CD10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000	CD22.2778(C19.0x34.015.8958)
	PR-HR031A/FR-HR041A	CI	CD02.2x18 019.0x24(016.6958)0	CD26.36118(C75.2x58 019.0x24)0

CAUTION

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.

Outer diameter [mm]	6.35	9.52	12.7	15.88	19.05	22.2	25.4	28.58	31.8	34.9	38.1	41.3	44.45	53.98
Minimum thickness [mm]	0.8	0.8	0.8	0.99	0.99	0.99	0.99	0.99	1.1	1.21	1.35	1.43	1.55	2.1

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

Y branch	Header
	4 branch	7 branch	10 branch
ARBLB01621, ARBLB03321, ARBLB07121, ARBLB14521, ARBLB23220	ARBL054	ARBL057	ARBL1010
	ARBL104	ARBL107	ARBL2010

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 ☑.)

graph TD
    A["Input A"] --> B["Processing Unit"]
    B --> C["Output 1"]
    B --> D["Output 2"]
    B --> E["Output 3"]
    B --> F["Output 4"]
    B --> G["Output 5"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#cfc,stroke:#333
    style E fill:#cfc,stroke:#333
    style F fill:#cfc,stroke:#333
    style G fill:#cfc,stroke:#333

graph TD
    A["A"] --> B["Process"]
    B --> C["Process"]
    B --> D["Process"]
    C --> E["Output"]
    D --> F["Output"]
    style B fill:#f9f,stroke:#333
    style C fill:#ccf,stroke:#333
    style D fill:#cfc,stroke:#333
    subgraph "No" (No)
        direction TB
        A --> B
        B --> C
        C --> D
        D --> E
        E --> F
    end

Ⓐ To Outside Unit
⑧ Sealed Piping

9 The Multi V water 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.
12 Always insulate the piping properly. Insufficient insulation will result in a decline in heating/cooling performance, drip of condensate and other such problems.
13 When connecting the refrigerant piping, make sure the service valves of the Outside Unit is completely closed (the factory setting) and do not operate it until the refrigerant piping for the Outside and Indoor Units has been connected, a refrigerant leakage test has been performed and the evacuation process has been completed.

14 Always use a non-oxidizing brazing material for brazing the parts and do not use flux. If not, oxidized film can cause clogging or damage to the compressor unit and flux can harm the copper piping or refrigerant oil.

WARNING

When installing and moving the air conditioner to another site, be sure to make recharge refrigerant 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.
• After selecting diameter of the refrigerant pipe to suit total capacity of the indoor unit connected after branching, use an appropriate branch pipe set according to the pipe diameter of the indoor unit and the installation pipe drawing.

INSTALLATION OF WATER PIPE

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.

graph LR
    A["Water pipe inlet"] --> B["Gate valve"]
    B --> C["Pressure gauge"]
    C --> D["Temperature gauge"]
    D --> E["Service port"]
    F["Water pipe outlet"] --> G["Gate valve"]
    G --> H["Pressure gauge"]
    H --> I["Temperature gauge"]
    I --> J["Service port"]
    K["Water pipe Inlet"] --> L["Gate valve"]
    L --> M["Pressure gauge"]
    M --> N["Temperature gauge"]
    N --> O["Service port"]
    P["Strainer"] --> Q["Service port"]
    Q --> R["Condensed water drain"]
    S["Drain line"] --> T["Condensed water drain"]

CAUTION

Do not directly connect the drain outlet to the water pipe outlet. (It can cause problems to the product.)

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.)

Pipe thickness		Shear stress Tensile stress				Bending moment		Torque
mm inch (kN) (kgf)		(kN) (kgf)	N			-m) (kgf m)		-m) (kgf m)/(N)
12.7	1/2	3.5	350	2.5	250	20	23	5	3.5
19.05	3/4	12	1200	2.5	250	20	2	115	11.5
25.4	1	11.2	1120	4	400	45	4.5	155	15.5
31.8	1 1/4 14.5	1450 6.5	650 87.5	3.75 265 26.5
38.1	1 1/2	16.5	1.7	9.5	0.95	155	16	350	35.5
50.8 2	21.5	2.2 13.5 1.4	255 26		600 61

Water pipe outlet Water pipe connection Water pipe inlet

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.

1. Pollution of Heat source Heat Source Water Refrigerant 2. Partially frozen 3. Damage

Head loss of strainer on water pipe

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

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 supplied. 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 : 10HP - 96LPM, 20HP - 192LPM
• Select the flow switch with the permitted pressure specification considering the pressure specification of the heat water supply system. (Control signal from outside unit is AC 220V.)

Cover Micro-switch Adjustment screw Vibration plate Bellows 1 inch or 3/4 inch socket Pad

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 direction 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 (5(A) and 5(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 : 10HP - 96LPM, 20HP - 192LPM)

! CAUTION

• 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 flux, 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.

PIPE CONNECTIONS BETWEEN IN- DOOR AND OUTSIDE UNIT

Refrigerant piping system

4 Outside Units

Example : 12 Indoor Units connected

Ⓐ : Outside Unit
⑧ : Y branch
⑭: Indoor Unit
E : Connection branch pipe between Outside units : ARCNB41
⑤ : Connection branch pipe between Outside units : ARCNB31
© : Connection branch pipe between Outside units : ARCNB21
① : Header
①: HR Unit

graph TD
    A["Slave 1"] --> B["Master"]
    B --> C["Slave 2"]
    C --> D["Slave 3"]
    D --> E["ODU Capacity Master ≥ Slave1 ≥ Slave2 ≥ Slave3"]
    E --> F["Terminal Node 1"]
    E --> G["Terminal Node 2"]
    E --> H["Terminal Node 3"]
    F --> I["Terminal Node 4"]
    G --> J["Terminal Node 5"]
    H --> K["Terminal Node 6"]
    I --> L["Terminal Node 7"]
    J --> M["Terminal Node 8"]
    K --> N["Terminal Node 9"]
    L --> O["Terminal Node 10"]
    M --> P["Terminal Node 11"]
    N --> Q["Terminal Node 12"]
    O --> R["Terminal Node 13"]
    P --> S["Terminal Node 14"]
    Q --> T["Terminal Node 15"]
    R --> U["Terminal Node 16"]
    S --> V["Terminal Node 17"]
    T --> W["Terminal Node 18"]
    U --> X["Terminal Node 19"]
    V --> Y["Terminal Node 20"]
    W --> Z["Terminal Node 21"]
    X --> AA["Terminal Node 22"]
    Y --> AB["Terminal Node 23"]
    Z --> AC["Terminal Node 24"]

• Case 1 ("a") : Maximum height is 15m if you install with Y branch.
• Case 2 ("b"): Maximum height is 5m in serial connection of HR units.

Conditional

To satisfy below condition to make 40 m \~ 90 m 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,C3 is same as Diameter A ∅6.35' ∅9.52' ∅12.7' ∅15.88' ∅19.05' ∅22.2' ∅25.4*, ∅28.58' ∅31.8*, ∅34.9' ∅38.1*

* : It is not necessary to size up.

2) While calculating whole refrigerant pipe length, pipe B,C3 length should be calculated twice.

$$ \begin{array}{l} A + B \times 2 + C 3 \times 2 + C 1 + C 2 + a + b + c + d + e + f + g + i + j + k + l + \ m + n \leq 5 0 0 m \end{array} $$

3) Length of pipe from each indoor unit to the HR Unit (a,b,c,d,e,f,g,i,j,k,l,m,n) ≤ 40 m
4) [Length of pipe from outside unit to the farthest indoor unit D12 (A+B+C+D+e)]

- [Length of pipe outside unit to the closest indoor unit D1(C1+a)] ≤ 40 m

Refrigerant pipe diameter from branch to branch (B,C,D)

WARNING

* : Serial connection of HR units : Capacity sum of indoor units ≤ 192.4 kBtu/hr
- Refer to the HR unit PCB part for the valve group control setting.
- It is recommended that difference in pipe lengths between an HR unit and indoor units, for example difference in length of a, b, c, and d, be minimized. The larger difference in pipe lengths, the more different performance between indoor units.
- Piping length from outside unit branch to outside unit ≤ 10m , equivalent length: max 13m (for 22HP or more)
* If the large capacity indoor units (Over 5 HP; using over ∅15.88/∅9.52) are installed, it should be used the Valve Group setting

Refrigerant pipe diameter from branch to branch (B,C)

Downward indoor unit total capacity [kW(Btu/h)]	Liquid pipe [mm(inch)]	Gas pipe [mm(inch)]
		Low pressure	High pressure
≤ 5.6(19,100)	∅6.35(1/4) ∅1	2.7(1/2) ∅9.52(3/8)
< 16.0 (54,600) ∅9.52(3/8) ∅15.88(5/8) ∅12.7(1/2)
≤ 22.4 (76,400)	∅9.52(3/8) ∅1	9.05(3/4) ∅15.88(5/8)
< 33.6(114,700) ∅9.52(3/8) ∅22.2(7/8) ∅19.05(3/4)
< 50.4 (172,000) ∅12.7(1/2) ∅28.58(1 1/8) ∅22.2(7/8)
< 67.2 (229,400) ∅15.88(5/8) ∅28.58(1 1/8) ∅22.2(7/8)
< 72.8(248,500) ∅15.88(5/8) ∅34.9(1 3/8) ∅28.58(1 1/8)
< 100.8(344,000) ∅19.05(3/4) ∅34.9(1 3/8) ∅28.58(1 1/8)
< 173.6(592,500) ∅19.05(3/4) ∅41.3(1 5/8) ∅34.9(1 3/8)
< 184.8(630,700) ∅22.2(7/8) ∅44.5(1 3/4) ∅41.3(1 5/8)
≤ 224.0(764,400)	∅22.2(7/8) ∅5	3.98(2 1/8) ∅44.5(1 3/4)

Total pipe length = A + B + C1 + C2 + C3 + a + b + c + d + e + f + g + i + j + k + l + m + n ≤ 500m

L	Longest pipe length	* Equivalent pipe length
	A+B+C3+D+k ≤ 150m(200m**)	A+B+C3+D+k ≤ 175m(225m**)
I	Longest pipe length after 1st branch
	B+C3+D+k ≤ 40m(90m**)
H	Difference in height(Outside Unit ↔ Indoor Unit)
	H ≤ 50m
h	Difference in height (Indoor Unit ↔ Indoor Unit)
	h ≤ 40m
h1	Difference in height (Outside Unit ↔ Outside Unit)
	h1 ≤ 2m
"a", "b"	Difference in height(HR unit ↔ HR unit)
	a ≤ 15m, b ≤ 5m,

• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, calculation purpose
• It is recommended that indoor unit is installed at lower position than the header.
• **: To apply conditional application.

WARNING

When the equivalent length between a outside and the farthest indoor unit is 90m or more, main pipe(A) must be increased one grade.

Refrigerant pipe diameter from outside unit to first branch. (A)

Upward outside unit total capacity	Pipe diameter			Pipe diameter when pipe length is 90m over to 1st branch
HP	Liquid pipe mm(inch)	Low pressure gas pipe mm(inch)	High pressure gas pipe mm(inch)	Liquid pipe mm(inch)	Low pressure gas pipe mm(inch)	High pressure gas pipe mm(inch)
8	9.52(3/8)	22.2(7/8)	19.05(3/4)	12.7(1/2)	22.2(7/8)	19.05(3/4)
10
12	12.7(1/2)	25.4(1)		15.88(5/8)	25.4(1)
14
16		28.58(1-1/8)			28.58(1-1/8)
18
20
22	19.05(3/4)	34.9(1-3/8)	28.58(1-1/8)	22.2(7/8)	34.9(1-3/8)	28.58(1-1/8)
24
26
28
30
32
34
36		41.3(1-5/8)	34.9(1-3/8)		41.3(1-5/8)	34.9(1-3/8)
38
40
42
44
46
48
50
52
54
56
58
60
62	22.2(7/8)	44.5(1-3/4)	41.3(1-5/8)	25.4(1)	44.5(1-3/4)	41.3(1-5/8)
64
66		53.98(2-1/8)	44.5(1-3/4)		53.98(2-1/8)	44.5(1-3/4)
68
70
72
74
76
78
80

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

Y branch, Header and HR unit connection pattern

Pattern 1

graph TD
    A["Central Component B"] --> B["HR1"]
    A --> C["HR2"]
    B --> D["1"]
    B --> E["2"]
    C --> F["3"]
    C --> G["4"]

• Impossible installation: Head branch pipe HR unit

graph TD
    A["Pattern 2"] --> B["HR1"]
    B --> C["A"]
    C --> D["7k 7k 7k 7k 7k 24k 24k"]
    B --> E["B"]
    E --> F["1"]
    E --> G["2"]
    E --> H["3"]
    E --> I["4"]
    E --> J[" "]
    E --> K[" "]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#cff,stroke:#333
    style F fill:#ffc,stroke:#333
    style G fill:#ffc,stroke:#333
    style H fill:#ffc,stroke:#333
    style I fill:#ffc,stroke:#333
    style J fill:#ffc,stroke:#333
    style K fill:#ffc,stroke:#333

• Impossible installation : HR unit → Head branch pipe → Y and Head branch pipe.

Pattern 3

graph TD
    A["Server"] --> B["HR1"]
    B --> C["12"]
    B --> D["4"]
    B --> E[" "]
    B --> F[" "]
    style B fill:#f9f,stroke:#333,stroke-width:2px
    note right of B "48k 48k 48k 48k"

• The maximum total capacity of indoor units is 56.4kW(192 kBtu/h).

Pattern 4

graph TD
    A["Book"] --> B["HR1"]
    B --> C["B"]
    C --> D["1 2 3 4"]
    C --> E["12k 12k"]
    C --> F["12k 12k"]

• The maximum total capacity of a branch pipe of HR unit is 14.1kW(48 kBtu/h).

Pattern 5

graph TD
    A["Input Data"] --> B["A"]
    B --> C["HR1"]
    C --> D["1"]
    C --> E["2"]
    C --> F["3"]
    C --> G["4"]
    C --> H["HR2"]
    H --> I["48k"]
    style C fill:#f9f,stroke:#333
    style H fill:#f9f,stroke:#333

Pattern 6

graph TD
    A["HR1"] --> B["1"]
    A --> C["2"]
    B --> D["24k"]
    C --> E["24k"]
    F["A"] --> G["3"]
    F --> H["12k"]
    I["A"] --> J["4"]
    I --> K["12k"]
    L["A"] --> M["5"]
    L --> N["24k"]

Pattern 7

graph LR
    A["Input"] --> B["Switch"]
    B --> C["HR1"]
    C --> D["1: 48k"]
    C --> E["2: 48k"]
    C --> F["Output"]
    G["HR2"] --> H["3: 48k"]
    G --> I["4: 48k"]
    G --> J["5: 48k"]
    G --> K["6: 48k"]
    L["HR3"] --> M["Output"]
    style L fill:#f9f,stroke:#333
    style M fill:#ccf,stroke:#333

• * : Serial connection of HR units : Capacity sum of indoor units ≤ 192 kBtu/h

Pattern 8

graph TD
    A["Component A"] --> HR1["HR1"]
    HR1 --> 1["1"]
    HR1 --> 2["2"]
    HR1 --> 48k["48k"]
    HR1 --> 48k["48k"]
    HR2["HR2"] --> 3["3"]
    HR2 --> 4["4"]
    HR2 --> 5["5"]
    HR2 --> 6["6"]
    HR2 --> 7["7"]
    HR2 --> 8["8"]
    HR2 --> A["A"]
    A --> 7["7"]
    A --> 8["8"]
    style HR1 fill:#f9f,stroke:#333
    style HR2 fill:#ccf,stroke:#333
    style HR1 fill:#cfc,stroke:#333
    style HR2 fill:#fcc,stroke:#333
    style HR1 fill:#ffc,stroke:#333
    style HR2 fill:#cfc,stroke:#333
    style HR1 fill:#fcc,stroke:#333
    style HR2 fill:#cfc,stroke:#333
    style HR1 fill:#ffc,stroke:#333
    style HR2 fill:#cfc,stroke:#333
    style HR1 fill:#fcc,stroke:#333
    style HR2 fill:#cfc,stroke:#333
    style HR1 fill:#ffc,stroke:#333
    style HR2 fill:#cfc,stroke:#333
    style HR1 fill:fill
    style HR2 fill:fill
    note right of HR1 "B"
    note right of HR2 "A"
    note right of HR1 "12k"
    note right of HR2 "12k 12k 12k"
    note right of HR1 "48k"
    note right of HR2 "48k"
    note right of HR1 "12k"
    note right of HR2 "12k 12k 12k"
    note right of HR1 "24k"
    note right of HR2 "24k"
    note right of HR1 "24k"
    note right of HR2 "8"

• * : Maximum indoor units per a branch are 8 indoor units

graph TD
    A["Indoor Unit 1"] --> B["Outside Unit"]
    B --> C["Y Branch pipe"]
    C --> D["HR1"]
    D --> E["Gas pipe"]
    D --> F["Liquid pipe"]
    G["Head Branch pipe 8"] --> H["Indoor Unit"]
    I["Pipe installation from outside units to HR units"] --> J["3 pipes(Low pressure Gas pipe, High pressure Gas pipe, Liquid pipe)"]
    K["Pipe installation from HR units to indoor units"] --> L["2 pipes(Gas pipe, Liquid pipe)"]

Keep the 40m distance from the first branch to the farthest indoor.

graph TD
    A["Power Supply"] --> B["Branch Y"]
    B --> C["Indoor Unit 1"]
    B --> D["Indoor Unit 2"]
    B --> E["Indoor Unit 3"]
    B --> F["Indoor Unit 4"]
    C --> G["1) under 40m"]
    D --> H["15m/16ft"]
    E --> I["15m/49ft"]
    F --> J["15m/49ft"]
    G --> K["Keep the sum of indoor capacity under 56.4kW/192 kBtu/h!"]
    H --> K
    I --> K
    J --> K
    K --> L["Indoor Unit 1"]
    K --> M["Indoor Unit 2"]
    K --> N["Indoor Unit 3"]
    K --> O["Indoor Unit 4"]
    K --> P["Indoor Unit 5"]

Keep the sum of indoor capacity under 56.4kW(192 kBtu/h).

Outside unit Connection

! WARNING

- In case of pipe diameter B connected after first branch is bigger than the main pipe diameter A, B should be of the same size with A.

Ex) In case indoor unit combination ratio 120% is connected to 20HP(58kW) outside unit.

1) Outside unit main pipe diameter A : ∅12.7(Liquid pipe), ∅28.58(Low pressure gas pipe), ∅19.05(High pressure gas pipe)

2) Pipe diameter B after first branch according to 120% indoor unitombination(69.6kW): ∅19.05(Liquid pipe), ∅34.9(Low pressure gas pipe), ∅28.58(High pressure gas pipe)

Therefore, pipe diameter B connected after first branch would be ∅19.05(Liquid pipe) / ∅34.9(Low pressure gas pipe) / ∅28.58(High pressure gas pipe) which is same with main pipe diameter.

Indoor Unit Connection

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

Indoor Unit capacity [kW(Btu/h)]	Liquid pipe [mm(inch)]	Gas pipe [mm(inch)]
≤ 5.6(19,100)	∅6.35(1/4) ∅12.7(1/2)
< 16.0(54,600) ∅9.52(3/8) ∅15.88(5/8)
< 22.4(76,400) ∅9.52(3/8) ∅19.05(3/4)
< 28.0(95,900) ∅9.52(3/8) ∅22.2(7/8)

CAUTION

• Bending radius should be at least twice the diameter of the pipe.
• Bend pipe after 500 mm or more from branch(or header).

Do not bend U type. It may cause Performance unsatisfactory or noise.

500mm or more 500mm or more

Pipe Connection Method/Precautions for Series connections between Outside units

• Separate Y branch joints are needed for series connections between outside unit s.
• Please refer to the below connection examples to install pipe connections between outside unit s.

Pipe connection between outside unit s (General Case)

The maximum pipe length after the first branching between the outside unit is 10m or let

Pipes between outside unit s are 2m or less

Pipes between outside unit s are 2m or longer

Oil Trap 2m or less 0.2m or more 2m or longer Oil Trap Oil Trap 2m or less 2m or less 2m or longer2m or longer

• If the distance between the outside unit s becomes more than 2m, apply Oil Traps between the gas pipes.
• If the outside unit is located lower than the main pipe, apply Oil Trap.

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, 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 or below, and if the location of the main pipe is lower than that of the outside 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.

Examples of Wrong Pipe Connections

graph TD
    A["Main pipe: If the main pipe is higher than the outside unit, oil is accumulated in the outside unit."] --> B["Oil Trap"]
    C["Main pipe: If there are differences in height between the outside unit, oil is accumulated in the lower outside unit."] --> D["Oil Trap"]

- The pipes between the outside unit s must maintain horizontal levelness or give an inclination to prevent a back flow toward the slave outside unit. Otherwise, the unit may not operate properly.

(Example 1)

Toward indoor unit

Toward indoor unit

(Example 2)

Toward indoor unit Pipe Inclination (2 or more)

Toward indoor unit

(Example 3)

Toward indoor unit

- Apply Oil Trap as shown below when the length of the pipe between the outside unit s is more than 2m. Otherwise, the unit may not operate properly.

(Example 1)

Toward indoor unit 2m

(Example 2)

Toward indoor unit 0.2m Oil Trap 2m 2m

- When connecting the pipes between the outside unit s, the accumulation of oil in the slave outside unit should be avoided. Otherwise, the unit may not operate properly.

(Example 1)

Toward indoor unit Toward indoor unit

(Example 2)

Toward indoor unit h

(Example 3)

Toward Indoor unit Toward Indoor unit h Oil Trap 0.5m h

The amount of Refrigerant

The calculation of the additional charge should take into account the length of pipe and CF(correction Factor) value of indoor unit.

Additional charge(kg) = Total liquid pipe : Ø25.4 mm × 0.480(kg/m) + Total liquid pipe : Ø22.2 mm × 0.354(kg/m) + Total liquid pipe : Ø19.05 mm × 0.266(kg/m) + Total liquid pipe : Ø15.88 mm × 0.173(kg/m) + Total liquid pipe : Ø12.7 mm × 0.118(kg/m) + Total liquid pipe : Ø9.52 mm × 0.061(kg/m) + Total liquid pipe : Ø6.35 mm × 0.022(kg/m) + Number of installed HR units × 0.5(kg/m) CF value of indoor unit

Amount refrigerant of Indoor units

Example) 4Way Ceiling Cassette 14.5kW -1ea, Ceiling concealed

Duct 7.3kW-2ea, Wall Mounted 2.3kW-4ea

CF = 0.64 × 1 + 0.26 × 2 + 0.24 × 4 = 2.12 ~kg

Attach the additional refrigerant table of IDU.

! WARNING

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

Total amount of refrigerant in the system of the room at which Indoor Unit of the least capacity is installed≤ 0.44 (kg / m^2)

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

• Selection of air conditioning system: select one of the next - Installation of effective opening part
• Reconfirmation of Outside Unit capacity and piping length
• Reduction of the amount of refrigerant
• Installation of 2 or more security device (alarm for gas leakage)
• Change Indoor Unit type : installation position should be over 2m 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

Refrigerant charging

Ⓐ Manifold Gauge
⑧ Low pressure side Handle
© High pressure side Handle

Liquid pipe Low Pressure Gas pipe High Pressure Gas pipe A B C

! WARNING

• Pipe to be vacuumed: Low pressure gas pipe, Liquid pipe
• If the refrigerant amount is not exact, it may not operate properly.
• If additionally bottled refrigerant amount is over 10%, condenser burst or insufficient indoor unit performance may be caused.

Branch pipe Fitting

Y branch

A To Branch Piping or Indoor Unit B To Outside Unit

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

Horizontal plane A Viewed from point A in direction of arrow Within ±10° Facing downwards Facing upwards Within ±3° Within ±3°

• 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.

Insulator (included with kit) Liquid and gas pipe joints Tape (field supply) Insulator for field piping

Header

Diagram showing a mechanical or electrical component with labeled parts ① and ②, likely illustrating a sequence or assembly.

Ⓐ To Outside Unit Ⓑ To Indoor Unit

- The indoor unit having larger capacity must be installed closer to ① 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.

© Pipe cutter

- When the number of pipes to be connected is smaller than the number of header branches, install a cap to the unconnected branches.

- 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.

B Pinched pipe

- Fit branch pipe lie in a horizontal plane.

View from point B in the direction of the arrow

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

Insulate the header using the insulation material attached to the branch pipe kit as shown in the figure.

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

Insulator Tape Insulator of field pipe

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

graph LR
    A["Cap pipe"] --> B["Insulator for cap pipe"]
    B --> C["Tape"]

Y branch pipe
[unit:mm]

Models	Gas pipe Liquid pipe
ARBLN01621
ARBLN03321
ARBLN07121
ARBLN14521
ARBLN23220

Header
[unit:mm]

Models	Gas pipe	Liquid pipe
4 branch ARBL054
7 branch ARBL057
4 branch ARBL104
7 branch ARBL107
10 branch ARBL1010
10 branch ARBL2010

Leak Test and Vacuum drying

Leak test

Leak test should be made by pressurizing nitrogen gas to 3.8 MPa(38.7kgf/cm²). 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.

graph TD
    A["Nitrogen gas cylinder"] --> B["Slave 1 outside unit"]
    B --> C["Master outside unit"]
    D["Nitrogen gas cylinder"] --> E["Slave 1 outside unit"]
    E --> F["Master outside unit"]
    G["HR unit"] --> H["Liquid side"]
    H --> I["Indoor unit"]
    J["Gas side"] --> K["HR unit"]
    L["Hydride pipe"] --> M["Close"]
    N["Light volume pump"] --> O["Close"]
    P["Hydride pipe"] --> Q["Close"]
    R["Light volume pump"] --> S["Close"]
    T["Hydride pipe"] --> U["Close"]
    V["Light volume pump"] --> W["Close"]
    X["Hydride pipe"] --> Y["Close"]
    Z["Light volume pump"] --> AA["Close"]
    AB["Water tank"] --> AC["Close"]
    AD["Water tank"] --> AE["Close"]
    AF["Water tank"] --> AG["Close"]
    AH["Water tank"] --> AI["Close"]
    AJ["Water tank"] --> AK["Close"]
    AL["Water tank"] --> AM["Close"]
    AN["Water tank"] --> AO["Close"]
    AP["Water tank"] --> AQ["Close"]
    AR["Water tank"] --> AS["Close"]
    AT["Water tank"] --> AU["Close"]
    AV["Water tank"] --> AW["Close"]
    AX["Water tank"] --> AY["Close"]
    AZ["Water tank"] --> BA["Close"]
    BB["Water tank"] --> BC["Close"]
    BD["Water tank"] --> BE["Close"]
    BF["Water tank"] --> BG["Close"]
    BH["Water tank"] --> BI["Close"]
    BJ["Water tank"] --> BK["Close"]
    BL["Water tank"] --> BM["Close"]
    BN["Water tank"] --> BO["Close"]
    BP["Water tank"] --> BQ["Close"]
    BR["Water tank"] --> BS["Close"]
    BT["Water tank"] --> BU["Close"]
    BV["Water tank"] --> BW["Close"]
    BX["Water tank"] --> BY["Close"]
    BZ["Water tank"] --> CA["Close"]
    CB["Water tank"] --> CC["Close"]
    CD["Water tank"] --> CE["Close"]
    CF["Water tank"] --> CG["Close"]
    CH["Water tank"] --> CI["Close"]
    CJ["Water tank"] --> CK["Close"]
    CL["Water tank"] --> CM["Close"]
    CN["Water tank"] --> CO["Close"]
    CP["Water tank"] --> CCO["Close"]
    CO --> CCO
    CX["Water tank"] --> CY["Close"]
    CZ["Water tank"] --> CZ
    DA["Water tank"] --> DB["Close"]
    DC["Water tank"] --> DE["Close"]
    DF["Water tank"] --> DG["Close"]
    DH["Water tank"] --> DI["Close"]
    DJ["Water tank"] --> DK["Close"]
    DL["Water tank"] --> DM["Close"]
    DN["Water tank"] --> DY["Close"]
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY
    DY --> DY

WARNING

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.

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^2 (0.01 MPa) for each 1^ 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.

! CAUTION

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.

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).
• 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.
• 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.

graph TD
    A["Vacuum pump"] --> B["Slave 1 outside unit"]
    C["Vacuum pump"] --> D["Slave 1 inside unit"]
    E["Scale Use a graviometer. (One that can measure down to 0.1kg). If you are unable to prepare such a"] --> F["Master outside unit"]
    G["HR unit"] --> H["Liquid side"]
    H --> I["Indoor unit"]
    H --> J["Gas side"]
    style A fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    style E fill:#f9f,stroke:#333
    style G fill:#f9f,stroke:#333
    style F fill:#ccf,stroke:#333
    style H fill:#cfc,stroke:#333
    style I fill:#fcc,stroke:#333
    style J fill:#fcc,stroke:#333

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.

WARNING

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.

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.)

WARNING

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.

Vacuum Mode

This function is used for creating vacuum in the system after compressor replacement, ODU parts replacement or IDU addition/replacement.

Vacuum mode setting method

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7 DIP SWITCH 7-Segment 8:8:8.6 SW04C ( X : cancel ) SW03C ( ▶ : forward ) SW02C ( ◀ : backward ) SW01C ( ● : confirm ) SW01D (reset )

graph TD
    A["Master unit PCB DIP switch on : No.5"] --> B["Select the mode using '▶', '◀' Button : "SVC" Push the '●' button"]
    B --> C["Select the Function using '▶', '◀' Button : "Se1" Push the '●' button"]
    C --> D["Start the vacuum mode : &quot;VACC&quot;<br>ODU V/V open<br>ODU EEV open<br>IDU EEV open"]
    D --> E["Vacuum mode"]

Vacuum mode off method

Dip switch off and push the reset button on Master unit PCB

CAUTION

ODU operation stops during vacuum mode. Compressor can't operate.

Thermal insulation of refrigerant piping

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.

Heat insulation material	Adhesive + Heat - resistant poly-ethylene foam + Adhesive tape
Outer covering	Indoor V	nyl tape
	Floor exposed	Water-proof hemp cloth + Bronze asphalt
	Outdoor	Water-proof hemp cloth + Zinc plate + Oily paint

Ⓐ Heat insulation material
⑧ Pipe
© Outer covering(Wind the connection part and cutting part of heat insulation material with a finishing tape.)

NOTE

When using polyethylene cover as covering material, asphalt roofing shall not be required.

Bad example

- Do not insulate gas or low pressure pipe and liquid or high pressure pipe together.

A B F C D E

Ⓐ Liquid pipe
⑧ Gas pipe
© Power lines
⑭ Finishing tape
© Insulating material
f Communication lines

- Be sure to fully insulate connecting portion.

Technical diagram showing mechanical assembly with labeled component A and corresponding schematic view

Ⓐ These parts are not insulated.

Good example

D C B D A E

Power lines Communication line Separation

Ⓐ Liquid pipe
⑧ Gas pipe
© Power lines
(d) Insulating material
© Communication lines

Technical drawing of mechanical components with cross-sectional views (no text or symbols)

Penetrations

Inner wall (concealed) Outer wall Outer wall (exposed)

Floor (fireproofing)

Penetrating portion on fire limit and boundary wall

Roof pipe shaft

Ⓐ Sleeve
⑧ Heat insulating material
© Lagging
© Caulking material
© Band
⑤ Waterproofing layer
© Sleeve with edge
⑧ Lagging material
① Mortar or other incombustible caulking
① 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.)

ELECTRICAL WIRING

CAUTION

- Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring regulations and guidance of each electric power company.

WARNING

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.

• Install the Outside Unit communication cable away from the power source wiring so that it is not affected by electric noise from the power source. (Do not run it through the same conduit.)
• Be sure to provide designated grounding work to Outside Unit.

CAUTION

Be sure to correct the outside unit to earth. Do not connect ground wire to any gas pipe, liquid pipe, lightening rod or telephone earth line. If earth is incomplete, it may cause an electric shock.

• Give some allowance to wiring for electrical part box of Indoor and Outside Units, because the box is sometimes removed at the time of service work.
• Never connect the main power source to terminal block of communication cable. If connected, electrical parts will be burnt out.
• Use 2-core shield cable for communication cable. (○ mark in the figure below) If communication cable of different systems are wired with the same multiplecore cable, the resultant poor transmitting and receiving will cause erroneous operations. (○ mark in the figure below)
• Only the communication cable specified should be connected to the terminal block for Outside Unit communication.

graph TD
    A["Outside Unit"] --> B["Indoor Unit"]
    B --> C["Indoor Unit"]
    C --> D["Indoor Unit"]
    D --> E["Indoor Unit"]
    E --> F["Indoor Unit"]
    F --> G["Indoor Unit"]
    G --> H["Indoor Unit"]
    H --> I["Indoor Unit"]
    I --> J["Indoor Unit"]
    J --> K["Indoor Unit"]
    K --> L["Indoor Unit"]
    L --> M["Indoor Unit"]
    M --> N["Indoor Unit"]
    N --> O["Indoor Unit"]
    O --> P["Indoor Unit"]
    P --> Q["Indoor Unit"]
    Q --> R["Indoor Unit"]
    R --> S["Indoor Unit"]
    S --> T["Indoor Unit"]
    T --> U["Indoor Unit"]
    U --> V["Indoor Unit"]
    V --> W["Indoor Unit"]
    W --> X["Indoor Unit"]
    X --> Y["Indoor Unit"]
    Y --> Z["Indoor Unit"]

2-Core Shield Cable

graph TD
    A["Outside Unit"] --> B["Indoor Unit"]
    B --> C["Remote control"]
    C --> D["Indoor Unit"]
    D --> E["Remote control"]
    E --> F["Indoor Unit"]
    F --> G["Remote control"]
    G --> H["Indoor Unit"]
    H --> I["Remote control"]
    I --> J["Indoor Unit"]
    J --> K["Remote control"]
    K --> L["Indoor Unit"]
    L --> M["Remote control"]
    M --> N["Indoor Unit"]
    N --> O["Remote control"]
    O --> P["Indoor Unit"]
    P --> Q["Remote control"]
    Q --> R["Indoor Unit"]
    R --> S["Remote control"]
    S --> T["Indoor Unit"]
    T --> U["Remote control"]
    U --> V["Indoor Unit"]
    V --> W["Remote control"]
    W --> X["Indoor Unit"]
    X --> Y["Remote control"]

Multi-Core Cable

graph TD
    subgraph_Master_Slave1_Slave2["Master Slave1 Slave2"]
        A1["Indoor Unit"] --> B1["Indoor Unit"]
        A2["Indoor Unit"] --> B2["Indoor Unit"]
        A3["Indoor Unit"] --> B3["Indoor Unit"]
    end
    subgraph_Master_Slave1_Slave2["Master Slave1 Slave2"]
        A4["Indoor Unit"] --> B4["Indoor Unit"]
        A5["Indoor Unit"] --> B5["Indoor Unit"]
        A6["Indoor Unit"] --> B6["Indoor Unit"]
    end
    A1 --> B1
    A2 --> B2
    A3 --> B3
    A4 --> B4
    A5 --> B5
    A6 --> B6
    B1 --> B2
    B2 --> B3
    B3 --> B4
    B4 --> B5
    B5 --> B6
    style Master Slave1 Slave2 fill:#f9f,stroke:#333
    style Master Slave1 Slave2 fill:#ccf,stroke:#333

2-Core Shield Cable

graph TD
    subgraph Master Slave1 Slave2
        A1["Master Slave1"] --> B1["Indoor Unit"]
        A2["Master Slave1"] --> B2["Indoor Unit"]
        A3["Master Slave1"] --> B3["Indoor Unit"]
        A4["Master Slave1"] --> B4["Indoor Unit"]
    end
    subgraph Indoor Unit
        C1["Indoor Unit"] --> D1["Remote Controller"]
        C2["Indoor Unit"] --> D2["Remote Controller"]
    end
    subgraph Remote Controller
        E1["Indoor Unit"] --> F1["Indoor Unit"]
        E2["Indoor Unit"] --> F2["Indoor Unit"]
    end
    style Master Slave1 Slave2 fill:#f9f,stroke:#333
    style Indoor Unit fill:#ccf,stroke:#333

Multi-Core Cable

CAUTION

• Use the 2-core shield cables for communication cables. 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.

Precautions when laying power wiring

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

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 cable which is the same thickness, do as shown in the figure below.

• For wiring, use the designated power cable 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.

! CAUTION

When the 400 volt power supply is applied to "N" phase by mistake, check damaged parts in control box and replace them.

Control Box and Wiring Location

• Remove all of the screws at front panel and remove the panel by pulling it forward.
• Connect communication cable between main and sub outside unit through the terminal block.
• Connect communication cables between outside unit and indoor units through the terminal block.
• When the central control system is connected to the outside unit, a dedicated PCB must be connected between them.
• When connecting communication cable between outside unit and indoor units with shielded cable, connect the shield ground to the earth screw.

Front Panel

Noise Filter Main PCB External PCB Take care of the phase sequence of 3-phase 4-wire power system

Communication and Power Cables

Communication cable

• Types : shielding wire
• Cross section : 1.0 \~ 1.5 mm²
• Insulation material : PVC
• Maximum allowable temperature: 60°C
• Maximum allowable line length: under 300m

Remote control cable

- Types : 3-core cable

Central control cable

Product type Cable	type Diameter
ACP&AC Manager 2-core cable (Shielding cable)		1.0~1.5mm ^2
AC Smart 2-core cable (Shielding cable)		1.0~1.5mm ^2
Simple central controller 4-core cable (Shielding cable)		1.0~1.5mm ^2

Separation of communication and power cables

- If communication and power cables 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 coupling.

The tables below indicates our recommendation as to appropriate spacing of communication and power cables where these are to be run side by side

Current capacity of power cable Spacing
100V or more	10A 300mm
	50A 500mm
	100A 1000mm
	Exceed 100A 1500mm

NOTE

• 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 cable involved.
• If the power supply waveform continues to exhibit some distortion the recommended spacing in the table should be increased.
• If the cable are laid inside conduits then the following point must also be taken into account when grouping various cable together for introduction into the conduits
• Power cable(including power supply to air conditioner) and communication cables must not be laid inside the same
• In the same way, when grouping the power wires and communication cables should not be bunched together.

CAUTION

- 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.

Wiring of main power supply and equipment capacity

• Use a separate power supply for the Outside Unit and Indoor Unit.
• Bear in mind ambient conditions (ambient temperature, direct sunlight, rain water, etc.) when proceeding with the wiring and connections.
• The cable 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%.
• Specific wiring requirements should adhere to the wiring regulations of the region.
• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from the power supply.

	The thickness of Minimum wire (mm2)			Leakage circuit breaker (4P ELCB)
	Main power wire	Branch wire	Ground wire
1 Unit 2.5~6 -		2.5		Below 30~50A 100mA 0.1sec
2 Unit	10~16	-	2.5	Below 75~100A 100mA 0.1sec
3 Unit	25~35	-	4	Below 125~150A 100mA 0.1sec
4 Unit	70	-	6	Below 175~200A 100mA 0.1sec

Ground wire

1 The power wire Between the master outside unit and slave1 outside unit - minimum : 6 mm ^2
2 The power wire Between the slave1 outside unit and slave2 outside unit - minimum : 4 mm ^2
3 The power wire Between the slave2 outside unit and slave3 outside unit - minimum : 2.5 mm²
*Power supply cords of appliances for outside unit use shall not be lighter than polychloroprene sheathed flexible cord (code designation 60245 IEC 57).
*Please use the 3-phase 4-wire quadrupole Leakage circuit breaker of circuit breaker.

WARNING

• Follow ordinance of your governmental organization for technical standard related to electrical equipment, wiring regulations and guidance of each electric power company.
• Make sure to use specified cables for connections so that no external force is imparted to terminal connections. If connections 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.

CAUTION

• 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.

Field Wiring

Single outside unit

graph TD
    A["Indoor Power supply (10 2wires)"] --> B["Power cable (4 Wires Cable)"]
    B --> C["Outside Unit"]
    C --> D["Power line (2 Wires Cable)"]
    C --> E["Power line (2 Wire Cable)"]
    C --> F["Power line (2 Wire Cable)"]
    C --> G["Power line (2 Wire Cable)"]
    C --> H["Power line (2 Wire Cable)"]
    C --> I["Power line (2 Wire Cable)"]
    C --> J["Power line (2 Wire Cable)"]
    C --> K["Power line (2 Wire Cable)"]
    C --> L["Power line (2 Wire Cable)"]
    C --> M["Power line (2 Wire Cable)"]
    C --> N["Power line (2 Wire Cable)"]
    C --> O["Power line (2 Wire Cable)"]
    C --> P["Power line (2 Wire Cable)"]
    C --> Q["Power line (2 Wire Cable)"]
    C --> R["Power line (2 Wire Cable)"]
    C --> S["Power line (2 Wire Cable)"]
    C --> T["Power line (2 Wire Cable)"]
    C --> U["Power line (2 Wire Cable)"]
    C --> V["Power line (2 Wire Cable)"]
    C --> W["Power line (2 Wire Cable)"]
    C --> X["Power line (2 Wire Cable)"]
    C --> Y["Power line (2 Wire Cable)"]
    C --> Z["Power line (2 Wire Cable)"]
    C --> AA["Power line (2 Wire Cable)"]
    C --> AB["Power line (2 Wire Cable)"]
    C --> AC["Power line (2 Wire Cable)"]
    C --> AD["Power line (2 Wire Cable)"]
    C --> AE["Power line (2 Wire Cable)"]
    C --> AF["Power line (2 Wire Cable)"]
    C --> AG["Power line (2 Wire Cable)"]
    C --> AH["Power line (2 Wire Cable)"]
    C --> AI["Power line (2 Wire Cable)"]
    C --> AJ["Power line (2 Wire Cable)"]
    C --> AK["Power line (2 Wire Cable)"]
    C --> AL["Power line (2 Wire Cable)"]
    C --> AM["Power line (2 Wire Cable)"]
    C --> AN["Power line (2 Wire Cable)"]
    C --> AO["Power line (2 Wire Cable)"]
    C --> AP["Power line (2 Wire Cable)"]
    C --> AQ["Power line (2 Wire Cable)"]
    C --> AR["Power line (2 Wire Cable)"]
    C --> AS["Power line (2 Wire Cable)"]
    C --> AT["Power line (2 Wire Cable)"]
    C --> AU["Power line (2 Wire Cable)"]
    C --> AV["Power line (2 Wire Cable)"]
    C --> AW["Power line (2 Wire Cable)"]
    C --> AX["Power line (2 Wire Cable)"]
    C --> AY["Power line (2 Wire Cable)"]
    C --> AZ["Power line (2 Wire Cable)"]
    C --> BA["Power line (2 Wire Cable)"]
    C --> BB["Power line (2 Wire Cable)"]
    C --> BC["Power line (2 Wire Cable)"]
    C --> BD["Power line (2 Wire Cable)"]
    C --> BE["Power line (2 Wire Cable)"]
    C --> BF["Power line (2 Wire Cable)"]
    C --> BG["Power line (2 Wire Cable)"]
    C --> BH["Power line (2 Wire Cable)"]
    C --> BI["Power line (2 Wire Cable)"]
    C --> BJ["Power line (2 Wire Cable)"]
    C --> BK["Power line (2 Wire Cable)"]
    C --> BL["Power line (2 Wire Cable)"]
    C --> BM["Power line (2 Wire Cable)"]
    C --> BN["Power line (2 Wire Cable)"]
    C --> BO["Power line (2 Wire Cable)"]
    C --> BP["Power line (2 Wire Cable)"]
    C --> BQ["Power line (2 Wire Cable)"]
    C --> BR["Power line (2 Wire Cable)"]
    C --> BS["Power line (2 Wire Cable)"]
    C --> BT["Power line (2 Wire Cable)"]
    C --> BU["Power line (2 Wire Cable)"]
    C --> BV["Power line (2 Wire Cable)"]
    C --> BW["Power line (2 Wire Cable)"]
    C --> BX["Power line (2 Wire Cable)"]
    C --> BY["Power line (2 Wire Cable)"]
    C --> BZ["Power line (2 Wire Cable)"]
    C --> CA["Power line (2 Wire Cable)"]
    C --> CB["Power line (2 Wire Cable)"]
    C --> CC["Power line (2 Wire Cable)"]
    C --> CD["Power line (2 Wire Cable)"]
    C --> CE["Power line (2 Wire Cable)"]
    C --> CF["Power line (2 Wire Cable)"]
    C --> CG["Power line (2 Wire Cable)"]
    C --> CH["Power line (2 Wire Cable)"]
    C --> CI["Power line (2 Wire Cable)"]
    C --> CJ["Power line (2 Wire Cable)"]
    C --> CK["Power line (2 Wire Cable)"]
    C --> CR["Power line (2 Wire Cable)"]
    C --> CS["Power line (2 Wire Cable)"]
    C --> CT["Power line (2 Wire Cable)"]
    C --> CU["Power line (2 Wire Cable)"]
    C --> CV["Power line (2 Wire Cable)"]
    C --> CW["Power line (2 Wire Cable)"]
    C --> CX["Power line (2 Wire Cable)"]
    C --> CY["Power line (2 Wire Cable)"]
    C --> CZ["Power line (2 Wire Cable)"]
    C --> DA["Power line (2 Wire Cable)"]
    C --> DB["Power line (2 Wire Cable)"]
    C --> DC["Power line (2 Wire Cable)"]
    C --> ED["Power line (2 Wire Cable)"]
    C --> EF["Power line (2 Wire Cable)"]
    C --> GF["Power line (2 Wire Cable)"]
    C --> GH["Power line (2 Wire Cable)"]
    C --> ID["Power line (2 Wire Cable)"]
    C --> JE["Power line (2 Wire Cable)"]
    C --> BK["Power line (2 Wire Cable)"]
    C --> BLA["Power line (2 Wire Cable)"]
    C --> BML["Power line (2 Wire Cable)"]
    C --> BNL["Power line (2 Wire Cable)"]
    C --> BOLX["Power Line (2 Wire Cable)"]
    C --> BPB["X"] & BPX["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BZ["X"] & BzX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"] & BZX["X"]

WARNING

• Indoor Unit ground wires are required for preventing electrical shock accident during current leakage, Communication 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.

Between Indoor and Master Outside unit

SCOU B SCOU A IDU B IDU A CEN B CEN A DRY7 DRY2 GND I2V Master Outdoor Unit HR unit The main for c the p conn

The GND terminal at the main PCB is a '-' terminal for day contact, it is not the point to make ground connection.

Series outside units

When the power source is supplied to Each outside unit individually.

graph TD
    A["Main Switch"] --> B["Inductor Power supply (10Vrms)"]
    B --> C["Power supply"]
    C --> D["Current Source"]
    D --> E["Inductor Units"]
    E --> F["Vastar"]
    E --> G["Sivat"]
    E --> H["Sivat2"]
    E --> I["St"]
    J["Frequency"] --> K["Voltage range(V)"]
    K --> L["Outdoor Inductor"]
    L --> M["Indoor Units"]
    M --> N["Current Source"]
    N --> O["Inductor Units"]
    O --> P["Vastar"]
    O --> Q["Sivat"]
    O --> R["Sivat2"]
    O --> S["St"]

Frequency	Voltage range(V)
	Outside Indoor
60Hz 380V 220V
50Hz 380-415V 220-240V

WARNING

• Indoor Unit ground wires are required for preventing electrical shock accident during current leakage, Communication 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.

Between Indoor and Master Outside unit

Master Outside Unit Master Outside Unit Slave1 Outside Unit 1 Slave2 Outside Unit 1 Slave3 Outside Unit 1

The GND terminal at the main PCB is a '-' terminal for dry contact. It is not the point to make ground connection.

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

Example) Connection of Communication Cable

[BUS type] [STAR type]

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

- Abnormal operation can be caused by communication defect, when connection of communication cable is installed like below figure(STAR type).

graph TD
    A["Central Server"] --> B["Module 1"]
    A --> C["Module 2"]
    A --> D["Module 3"]
    A --> E["Module 4"]
    A --> F["Module 5"]
    A --> G["Module 6"]
    A --> H["Module 7"]
    A --> I["Module 8"]

graph TD
    A["Central Device"] --> B["Module 1"]
    A --> C["Module 2"]
    A --> D["Module 3"]
    A --> E["Module 4"]
    A --> F["Module 5"]
    A --> G["Module 6"]
    A --> H["Module 7"]
    A --> I["Module 8"]
    A --> J["Module 9"]
    A --> K["Module 10"]
    A --> L["Module 11"]
    A --> M["Module 12"]
    A --> N["Module 13"]
    A --> O["Module 14"]
    A --> P["Module 15"]
    A --> Q["Module 16"]
    A --> R["Module 17"]
    A --> S["Module 18"]
    A --> T["Module 19"]
    A --> U["Module 20"]
    A --> V["Module 21"]
    A --> W["Module 22"]
    A --> X["Module 23"]
    A --> Y["Module 24"]
    A --> Z["Module 25"]

Example) Connection of power and communication cable (UWC)

Main power terminal block Ground wire Power/ Ground cable Over 50mm gap Communication cable

Main Power Connection Communication Connection

Main power luminal block Insulation switches attachments File family not to be displaced

OOL IDU Communication cable OOL-ODU Communication cable

! CAUTION

It should be wiring power cables or communication cables to avoid interference with the oil level sensor. Otherwise, That oil level sensor would be operated abnormally.

Checking the setting of outside units

Checking according to dip switch setting

- You can check the setting values of the Master outside unit from the 7 segment LED.

The dip switch setting should be changed when the power is OFF.

Checking the initial display

The number is sequentially appeared at the 7 segment in 5 seconds after applying the power. This number represents the setting condition.

• Initial display order

Order No Mean
1	8~20 Master model capacity
2	10~20 Slave 1 model capacity
3	10~20 Slave 2 model capacity
4	10~20 Slave 3 model capacity
5	8~80 Total capacity
6	1 Cooling Only
	2	Heat Pump
	3	Heat Recovery
7	38	380V model
	46	460V model
	22	220V model
8	1	Full function
	2	Core function

• Example) ARWB620LAS4

1 2	3 4	5 6	7	8
20 20	12 10	62 3	38	1

• Master Unit - Slave Unit

Dip switch setting Dip switch setting ODU Setting
		Slave 1
		Slave 2
		Slave 3

HR UNIT PCB

#1 valve housing #1 cooling valve LED(green) #1 heating valve LED(red) #4 valve housing 18.8 7-SEG SW05M (Switch for addressing HR unit) SW01M SW02M (Dip switch for setup of the function of HR unit) SW03M SW04M SW01M/SW03M/SW04M (Switch for manual valve addressing)

Switch for setup of HR Unit

Main function of SW02M

SW02M	ONS/W	Selection
	No.1	Method for addressing valves of an HR unit (Auto/Manual)
	No.2	Model of HR unit
	No.3	Model of HR unit
	No.4	Valve group setting
	No.5	Valve group setting
	No.6	Valve group setting
	No.7	Use only in factory production (preset to "OFF")	Zoning setting ("ON")
	No.8	Use only in factory production (preset to "OFF")

1 Selection of the method for addressing valves of an HR unit (Auto/Manual)

Auto Manual

Switch No.1 OnSwitch No.1 Off

2 Setting the zoning control

	DIP S/W setting
Normal control
Zoning control

3 Selection of the model of the HR unit

	(For 2 branches)PRHR021	(For 3 branches)PRHR031	(For 4 branches)PRHR041
Initial Setting
1 branches Connected
2 branches Connected
3 branches Connected
4 branches Connected

* Each model is shipped with the switches No.2 and No.3 pre-adjusted as above in the factory.

WARNING

• If you want to use a PRHR031 for 2 branches HR unit after closing the 3rd pipes, set the dip switch for 2 branches HR unit.
• If you want to use a PRHR041 for 3 branches HR unit after closing the 4th pipes, set the dip switch for 3 branches HR unit.
• If you want to use a PRHR041 for 2 branches HR unit after closing the 3rd and 4th pipes, set the dip switch for 2 branches HR unit.
• The unused port must be closed with a copper cap, not with a plastic cap.

4 Setting the Valve Group.

	DIP S/W setting	Example
Not control			Indoor UnitIndoor UnitIndoor UnitIndoor Unit
No.1, 2 Valve Control			Indoor UnitIndoor UnitLarge capacity indoor unit
No.2, 3 Valve Control			Indoor UnitLarge capacity indoor unitIndoor Unit
No.3, 4 Valve Control			Large capacity indoor unitIndoor UnitIndoor Unit
No.1, 2 Valve / No.3, 4 Valve Control			Large capacity indoor unitLarge capacity indoor unit

Indoor Unit Indoor Unit Indoor Unit Indoor Unit
Indoor Unit Indoor Unit Large capacity indoor unit
Indoor Unit Large capacity indoor unit Indoor Unit
Large capacity indoor unit Indoor Unit Indoor Unit
Large capacity indoor unit Large capacity indoor unit

NOTE

If the large capacity indoor units are installed, below Y branch pipe should be used.

Y branch pipe

[Unit:mm]

Models Gas	Pipe Liquid pipe
ARBLB03321

SW05M (Rotary S/W for addressing HR unit)

Must be set to '0' when installing only one HR unit.

When installing multiple HR units, address the HR units with sequentially increasing numbers starting from '0'.

Ex) Installation of 3 HR units

SW01M/SW03M/SW04M (Dip S/W and tact S/W for manual valve addressing)

1 Normal setting (Non-Zoning setting)

• Set the address of the valve of the HR unit to the central control address of the connected indoor unit.
• SW01M: selection of the valve to address SW03M: increase in the digit of 10 of valve address SW04M: increase in the last digit of valve address
• Prerequisite for manual valve addressing : central control address of each indoor unit must be preset differently at its wired remote control.

SW03M	S/W No.	Setup
	No.1	Manual addressing of valve #1
	No.2	Manual addressing of valve #2
	No.3	Manual addressing of valve #3
	No.4	Manual addressing of valve #4
	SW03M	Increase in the digit of 10 of valve address
	SW04M	Increase in the last digit of valve address

2 Zoning setting

• Set the address of the valve of the HR unit to the central control address of the connected indoor unit.
• SW01M : selection of the valve to address SW03M : increase in the digit of 10 of valve address SW04M : increase in the last digit of valve address SW05M : Rotary S/W
• Prerequisite for manual valve addressing : central control address of each indoor unit must be preset differently at its wired remote control.

SW03M	S/W No.	Setup
	No.1	Manual addressing of valve #1
	No.2	Manual addressing of valve #2
	No.3	Manual addressing of valve #3
	No.4	Manual addressing of valve #4
	SW03M	Increase in the digit of 10 of valve address
	SW04M	Increase in the last digit of valve address
	SW05M	Manual addressing of zoning indoor units

Automatic Addressing

The address of indoor units would be set by Automatic Addressing

• Wait for 3 minutes after supplying power. (Master and Slave outside unit s, indoor units)
• Press RED button of the outside unit s for 5 seconds. (SW01C)
• A "88" is indicated on 7-segment LED of the outside unit PCB.
• For completing addressing, 2\~7 minutes are required depending on numbers of connected indoor units
• Numbers of connected indoor units whose addressing is completed are indicated for 10 seconds on 7-segment LED of the outside unit PCB
• Numbers of connected HR units whose addressing is completed are indicated for 10 seconds on 7-segment LED of the outside unit PCB
• 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 connected indoor units)

[MAIN PCB]

DIP-SWITCH 7 - Segment 8:8:8 SW04C (xe cancel) SW03C (► : forward) SW02C (◄ : backward) SW01C (● : confirm) SW01D (reset)

CAUTION

• In replacement of the indoor unit PCB, always perform Automatic addressing setting again (At that time, please check about using Independent power module to any indoor unit.)
• If power supply is not applied to the indoor unit, operation error occur.
  • Automatic Addressing is only possible on the master Unit.
  • Automatic Addressing has to be performed after 3 minutes to improve communication.

Automatic pipe detection

1 Turn No.1 of SW02M of HR unit PCB off.
2 Confirm that the setting of No.2, 3 of SW02M corresponds with the number of indoor units.
3 Reset the power of HR unit PCB
4 Master unit PCB DIP switch on : No.5
5 Select the mode using '▶', '◀' Button: "Idu" Push the '●' button
6 Select the "Id 5" function using '▶', '◀' Button: "Ath" or "Atc" Push the '●' button. Outdoor temperature is over 15°C(59°F): "Atc" Using (If it fail, use "Ath") Outdoor temperature is below 15°C(59°F): "Ath" Using (If it fail, use "Atc")
7 Select the mode using '▶', '◀' Button: "Idu" Push the '●' button
8 Select the "Id 6" function using '▶', '◀' Button: "StA" Push the '●' button
9 Operated after 88 is displayed on 7-SEG of the outside unit main PCB.
10 Pipe detection proceed.
11 5\~30 minutes are required depending on the number of the indoor units and outdoor temperature.
12 The number of the indoor units installed is displayed on 7-SEG of the outside unit main PCB for about 1 minute

• For a HR unit, the number of the indoor units connected to each HR unit is displayed.
• '200' is displayed in case of auto pipe detection error, and auto detection is completed after '88' is disappeared.
  * Auto pipe detection function : the function that sets connection relationship automatically between the indoor unit and HR unit.

! WARNING

• Execute auto addressing and auto pipe detection again whenever the indoor PCB and HR unit PCB is replaced.
• Operation error occurs unless power is applied to the indoor and HR units.
• Error No.200 occurs if the number of connected indoor units and that of scanned indoor units are different.
• When auto pipe detection fails, complete it with manual pipe detection (see Manual pipe detection).
• When auto pipe detection addressing is completed normally, manual pipe detection is not required.
• If you want to do auto pipe detection again after auto pipe detection fails, do after reset of outside unit by all means.
• During 5 minutes after pipe detection is completed, do not turn off the main unit PCB to save the result of pipe detection automatically.

Manual pipe detection

1 Enter the central control address into each indoor unit using its wired remote control.
2 Turn No.1 of SW02M of HR unit PCB on.
3 Reset the power of HR unit PCB.
4 On the HR unit PCB, manually set address of each valve of the HR unit to the central control address of the indoor unit connected to the valve.
5 Reset the power of outside unit PCB.
6 The number of the indoor unit installed is displayed after about 5 minutes.
Ex) HR → The number of the indoor
7 Reset the power of outside unit PCB, HR unit.
8 Manual pipe detection is completed

WARNING

• In case that central controller is not installed, remain the address data after installer sets central control address as he wants
• In case that central controller is installed, there would be central control address in wired remote control of indoor unit.
• In this case, set the HR unit manual pipe address according to central control address of indoor unit.
• Pipe which is not connected with indoor unit should be set different address with pipe Connected with indoor unit. (If addresses are piled up, corresponding valve is not working.
• If you want to change the setting of manual pipe, you should do it on HR unit PCB.
• If an error occurred, it means that manual pipe setting is not completed.
• During 5 minutes after pipe detection is completed, do not turn off the main unit PCB to save the result of pipe detection automatically.

The Procedure of Automatic Addressing

graph TD
    A["Power On"] --> B["Waiting 3 minutes"]
    B --> C["Press RED Button for 5 sec. (SW01C)"]
    C --> D["7-segment LED = 88"]
    D --> E["Don't press RED Button (SW01C)"]
    E --> F["Waiting about 2-7 minutes"]
    F --> G{7-segment LED = 88}
    G -->|YES| H["OK"]
    G -->|NO Check the connections| I["of communication cable"]
    I --> C
    C --> J["Automatic addressing start"]
    J --> D
    G --> K["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 Automatic addressing is completed normally."]

Flow chart of auto addressing for pipe detection

graph TD
    A["Confirmation of indoor unit address setting"] --> B["Turn No.1 of SW02M of HR unit PCB off"]
    B --> C["Confirm that the setting of No.2, 3 of SW02M corresponds with the number of indoor units"]
    C --> D["Reset the power of HR unit PCB"]
    D --> E["Master unit PCB DIP switch on: No.5"]
    E --> F["Select the mode using '▶', '◀' Button: 'Idu' Push the '●' button"]
    F --> G["Select the "Id 5" function using '▶', '◀' Button: "Ach" or "Atc" Push the '●' button. Outdoor temperature is over 15°C(59°F): "Ate" Using (If it fail, use "Ach") Outdoor temperature is below 15°C(59°F): "Ach" Using (If it fail, use "Atc")"]
    G --> H["Select the mode using '▶', '◀' Button: "Idu" Push the '●' button"]
    H --> I["Select the "Id 6" function using '▶', '◀' Button: "SIA" Push the '●' button"]
    I --> J["88 is displayed on 7-SEG of the outside unit main PCB"]
    J --> K["Outside unit is operated for 5-60 minutes."]
    K --> L{Is the pipe setting condition satisfied during the operation of indoor unit?}
    L -->|NO| M["Display error on outside unit PCB"]
    L -->|YES| N{Are the number of indoor units connected to the outside unit wiring and displayed one equal?}
    N -->|NO| O["Pipe detection error occur after 30 seconds."]
    N -->|YES| P["Completion of auto pipe detection"]
    O --> Q["Check the installation of pipe of outside, indoor, HR unit"]
    Q --> R["Rely auto pipe detection after checking trouble"]
    R --> S["Incompletion of auto pipe detection"]

It is possible to be generated mode changing noise of heating and cooling which is normal. There is no mode changing noise at normal operation.

DIP-SW01 7 - Segment SW04C (×: cancel) SW03C (►: forward) SW02C (◄: backward) SW01C (●: confirm) SW01D (reset)

Flow chart of manual addressing for pipe detection

graph TD
    A["Execute in case of Auto pipe detection failure"] --> B["Turn No.1 of 5W02M of HR unit PCB on."]
    B --> C["Reset the power of HR unit PCB."]
    C --> D["Enter the central control address into each indoor unit using its wired remote control."]
    D --> E["On the HR unit PCB, manually set address of each valve of the HR unit to the central control address of the indoor unit connected to the valve."]
    E --> F["Reset the power of outside unit PCB."]
    F --> G["Wait for about 5 minutes."]
    G --> H["The number of the indoor units installed is displayed. Ex|HR → The number of the indoor"]
    H --> I{Are the number of indoor units connected to the outside unit and displayed one equal?}
    I -->|NO| J["Check the central control address of indoor and HR unit."]
    J --> K["Make sure that reset the outside unit power when changing the central control unit"]
    K --> L["Completion of manual pipe detection"]
    L --> F

Example of manual valve addressing (Non-Zoning setting)

(In case that an indoor unit of central control address "11" is connected to a valve #1 of an HR unit)

- Prerequisite for manual valve addressing: central control address of each indoor unit must be preset differently at its wired remote control.

No.	Display and setup Setup	and Contents
1	7-SEG SW01M SW03M SW04M	- Operation: None- Display: None
2	7-SEG SW01M SW03M SW04M	- Operation: Turn dip S/W No.1 on to address valve #1- Display: Existing value saved in EEPROM is displayed in 7-SEG.
3	7-SEG SW01M SW03M SW04M	- Operation: Set the digit of 10 to the number in Group High data of the wired remote control connected to the corresponding indoor unit to the valve #1 by pressing left tack S/W.- Display: Digit increasing with the times of pressing tack S/W is displayed in left 7-SEG
4	7-SEG SW01M SW03M SW04M	- Operation: Set the digit of 1 to the number in Group Low data of the wired remote control connected to the corresponding indoor unit to the valve #1 by pressing right tack S/W.- Display: Digit increasing with the times of pressing tack S/W is displayed in right 7-SEG
5	7-SEG SW01M SW03M SW04M	- Operation: Turn dip S/W No.1 off to save the address of valve #1- Display: "11" displayed in 7-SEG disappears

- Above setup must be done for all HR unit valves.

- The valve that is not connected with any indoor unit should be addressed with any other number than used address numbers of the valves connected with indoor units.

(The valves does not work if the address numbers are same.)

Example of manual valve addressing (Zoning setting)

(In case that an indoor unit of central control address "11" is connected to a valve #1 of an HR unit)

Zoning control is connecting 2 or more indoor units at one pipe of HR unit. In case of Zoning control, in order to set controls with multiple indoor units connection uses the rotary switch. Namely, only the rotary switch changes from same valve set condition and set indoor units connection.

1 On dip switch of the corresponding valves and sets the rotary switch at 0.
2 Setting the number with tact switch.
3 In case of addition of indoor units to same port, increases 1 with the rotary switch and sets number with tact switch.
4 In case of checking the number which the corresponding valve is stored, turn on dip switch and set the number of rotary switch.
5 Indoor units set available 7 per a port(rotary switch 0\~6), in case of setting above of 7 with rotary switch, it will display error.
6 Setting the rotary switch on original condition(HR unit number set conditions) after all finishing a piping setting.
7 The rotary switch set value of above number of indoor units which is connected with FF and prevents a malfunction. (Example: The case where 3 indoor units is connected in piping 1, sets from rotary switch 0,1,2 and 3,4,5 with FF set)

- Prerequisite for manual valve addressing: central control address of each indoor unit must be preset differently at its wired remote control.

No.	Display and setup Setup	and Contents
1		- Operation: None- Display: None
2		- Operation : Turn dip S/W No.1 on to address valve #1- Display : Existing value saved in EEPROM is displayed in 7-SEG.
3		- Operation : Set the digit of 10(1) to the number in Group High data of the wired remote control connected to the corresponding indoor unit to the valve #1 by pressing left tack S/W.- Display : Digit increasing with the times of pressing tack S/W is displayed in left 7-SEG.
4		- Operation : SW05M : 1- Display : Display former value.
5		- Operation : Setting No. using SW03M and SW04M, SW05M : 1- Display : Display setting value.
6		- Operation : Turn dip S/W No.1 off to save the address of valve #1- Display : "11" displayed in 7-SEG disappears.
7		- Operation : Return valve of addressing HR unit.- Display : None

- Above setup must be done for all HR unit valves.

- The valve that is not connected with any indoor unit should be addressed with any other number than used address numbers of the valves connected with indoor units.

(The valves does not work if the address numbers are same.)

Example of checking valve address

(In case that an indoor unit of central control address "11" is connected to a valve #1 of an HR unit)

No.	Display and setup Setup	and Contents
1	7-SEG SW01M	- Operation: Turn dip S/W No.1 on.- Display: "11" is displayed in 7-SEG
2	7-SEG SW01M	- Operation: Turn dip S/W No.1 on.- 7-SEG disappeared

Identification of Manual Valve ID (Address)

No.	Display and setup Setup	and Contents
1	7-SEG SW01M	- Operation: more than 2 dip switches turned on.- Display: "Er" is displayed in 7-SEG

Setting method of Master indoor unit in zoning

1 Master unit PCB DIP switch on: No.5
2 Select the mode using '▶', '◀' Button: "idu" Push the '●' button
3 Select the "id 7" function using '▶', '◀' Push the '●' button
4 select HR unit number and Pipe number as you want to change

• 7-Segment Display "[x][y][_][']
  [ ]: Blank, [x]: HR unit number, [y]: Pipe number
• Change the HR unit number and Pipe number using '▶', '◀' Push the '●' button as you want to set

5 Select IDU number as you want

• 7-Segment Display "[_] [_] [x] [y]"
  [ ]: Blank, [x]: Indoor unit 10-digit number, [y]: Indoor unit 1-digit number
• Set the master IDU number using '▶', '◀' Push the '●' button as you want to set

CAUTION

• Waiting for 80 seconds after power on.
• The zoning information and Master IDU information remove from EEPROM after Auto-addressing.
• If there is installed the central control, it is impossible setting of Master IDU in zoning.

Dip switch setting

Setting the function

Select the mode/function/option/value using '▶', '◀' Button and confirm that using the '●' button after dip switch No.5 is turned on.

! CAUTION

It is only executed when all indoor units are off.

1 2 3 4 5 6 7

DIP-SW01 7 - Segment SW04C (sc) cancel SW03C (► : forward) SW02C (◄ : backward) SW01C (● : confirm) SW01D (reset)

Mode		Function		Option			Value		Action		Remarks
Content	Display1	Content	Display2	Content		Display3	Content	Display4	Implement	Display5
Installation	Func	Geothermal mode setting	Fn2	on	oFF	Selected the cotion	-	-	Change the set value	Blank	Save in EEPROM
		Sol. Valve 200 V output	Fn3	on	oFF	Selected the cotion	-	-	Change the set value	Blank	Save in EEPROM
		Variable water flow control	Fn4	on	oFF	Selected the cotion	-	-	Change the set value	Blank	Save in EEPROM
		Outside unit address	Fn5	-		-	0~254	set the value	Change the set value	Blank	Save in EEPROM
		Target pressure adjusting	Fn7	oFF	op1~ op4	Selected the cotion	-	-	Change the set value	Blank	Save in EEPROM
		Use Sump Heater	Fn8	on	oFF	Selected the cotion	-	-	Change the set value	Blank	Save in EEPROM
		IDU capacity adjusting	Fn9	on	oFF	Selected the cotion	-	-	Change the set value	Blank	Save in EEPROM

* Functions save in EEPROM will be kept continuously, though the system power was reset.

To cancel the function you need to set OFF.

Group Number setting

Group Number setting for Indoor Units

• Confirm the power of whole system(Indoor Unit, Outside Unit) is OFF, otherwise turn off.
• The communication cables connected to CEN.A and CEN.B terminal should be connected to central control of Outside Unit with care for their polarity (A-A, B-B).
• Turn the whole system on.
• Set the group and Indoor Unit number with a wired remote control.
• To control several sets of Indoor Units into a group, set the group ID from 0 to F for this purpose.

Outside Units (External PCB)

SODU.B SODU.A IDU.B IDU.A CEN.B CEN.A DRY1 DRY2 GND 12V B(D) A(C) BA

Example) Group number setting

1 F

Group Indoor unit

1^st number indicate the group number 2nd number point out indoor unit number

Group recognizing the 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)

WARNING

- Valve address and central control address of its corresponding indoor unit should be set identical in manual addressing.

graph LR
    A["EX"] --> B["HR unit"]
    B --> C["Valve (04)"]
    B --> D["Valve (03)"]
    B --> E["Valve (02)"]
    B --> F["Valve (01)"]
    C --> G["Indoor unit (04)"]
    D --> H["Indoor unit (03)"]
    E --> I["Indoor unit (02)"]
    F --> J["Indoor unit (01)"]
    K["Central control address"] --> L["End"]

Geothermal mode setting

If you want to use the product with heat source water of the low temperature such as ground heat, it is the function that enables the use of ground heat mode.

How to set the mode

graph TD
    A["Turn on DIP switch No.5 of the master unit PCB"] --> B["Use '►' and '◄' button to mark "Func" in the 7 segment, and press '●' button."]
    B --> C["Use '►' and '◄' button to mark "Fn2" in the 7 segment, and press '●' button."]
    C --> D["Use ' ' and ' ' button to select between "ON" and "OFF" in the 7 segment, and press '●' button."]
    D --> E["Decide the Geothermal mode according to the setting mode."]

Mode setting

• ON: Set to operate in geothermal mode
• OFF: Set to operate in general mode

Anti freeze type	Minimum temperature for anti freezing (°C)
	0 -5	10 -15	20 -25
Ethylene glycol (%) 0	12 20	30 --
Propylene glycol (%)	0 17 25	33 --
Methanol (%) 0 6	12 16 24	30

CAUTION

• Request the function settings to the installation specialist during the outside unit installation.
• When the function is not used, set it to OFF.
• Before changing the mode, make sure to check if the antifreeze is added to the heat source water with appropriate ratio. (If it is set to geothermal mode with inappropriate addition of antifreeze or without antifreeze, there is a risk of product damage, and we will not be responsible for such damage of the product.)
• When you add antifreeze, there may be increase of pressure difference in the heat source water system and product performance degradation.
• If it is in geothermal mode, add antifreeze according to the temperature condition of at least -10^ . (If the added amount is of -10^ or more, it may cause freeze and burst of the heat source water.)

Sol. Valve 220V output

It is the function to select 220V output when you want solenoid valve control.

How to set the mode

graph TD
    A["Turn on DIP switch No.5 of the master unit PCB"] --> B["Use '►' and '◄' button to mark "Func" in the 7 segment, and press '●' button."]
    B --> C["Use '►' and '◄' button to mark "Fn3" in the 7 segment, and press '●' button."]
    C --> D["Use '►' and '◄' button to select between "ON" and "OFF" in the 7 segment, and press '●' button."]
    D --> E["Decide Sol. Valve 220V control according to the set mode."]

Mode setting

• ON: Set to control the heat source water pipe Solenoid Valve from the product.
• OFF: Set not to control the heat source water pipe Solenoid Valve from the product.

! CAUTION

• Request the function settings to the installation specialist during the outside unit installation.
• When the function is not used, set it to OFF.

Variable water flow control

It is the function to select when you want to install Variable water flow control kit and control it from the product.

How to set the mode

graph TD
    A["Turn on DIP switch No.5 of the master unit PCB"] --> B["Use '►' and '<◄' button to mark &quot;Func&quot; in the 7 segment, and press '●' button."]
    B --> C["Use '►' and '<◄' button to mark &quot;Fn4&quot; in the 7 segment, and press '●' button."]
    C --> D["Use '►' and '<◄' button to select between &quot;ON&quot; and &quot;OFF&quot; in the 7 segment, and press '●' button."]
    D --> E["Decide the Variable water flow control mode according to the set mode."]

Mode setting

• ON: Set to control the variable water flow control valve from the product
• OFF: Set not to control the variable water flow control valve from the product

! CAUTION

• Request the function settings to the installation specialist during the outside unit installation.
• When the function is not used, set it to OFF.

Setting the outside unit address

How to set the mode

graph TD
    A["Turn on DIP switch No.5 of the master unit PCB"] --> B["Use '►' and '<►' button to mark &quot;Func&quot; in the 7 segment, and press '●' button."]
    B --> C["Use '►' and '<►' button to mark &quot;Fn5&quot; in the 7 segment, and press '●' button."]
    C --> D["Use '►' and '<►' button to select one among &quot;0&quot; ~ &quot;254&quot; in the 7 segment, and press '●' button."]
    D --> E["Outside unit address is set."]

! CAUTION

- Request the function settings to the installation specialist during the outside unit installation.

- If use a function, first install a Central controller.

Target pressure adjusting

How to set the mode

graph TD
    A["Turn on DIP switch No.5 of the master unit PCB"] --> B["Use '►' and '<◄' button to mark &quot;Func&quot; in the 7 segment, and press '●' button."]
    B --> C["Use '►' and '<◄' button to mark &quot;Fn7&quot; in the 7 segment, and press '●' button."]
    C --> D["Select the Option using '►', '<◄' Button: &quot;HEAT&quot;, &quot;COOL&quot; Push the '●' button"]
    D --> E["Select the Option using '►', '<◄' Button: &quot;op1&quot; ~ &quot;op4&quot; Push the '●' button"]
    E --> F["Decide target pressure according to the set mode."]

Setting

Mode	Purpose		Condensing temperature variation	Evaporating temperature variation
	Heat Cool
op1	increase capacity Increase capacity -3 °C		+2 °C
op2	Decrease power consumption	Increase capacity -1.5 °C -2 °C
op3	Decrease power consumption	Decrease power consumption	+2.5 °C -4 °C
op4	Decrease power consumption	Decrease power consumption	+4.5 °C -6 °C

! CAUTION

• Ask an authorized technician to setting a function.
• If do not use a function, set an off-mode.
• Change a power consumption or capacity.

Use Sump Heater

It is the function to select when you want to connect and use Sump Heater.

How to set the mode

graph TD
    A["Turn on DIP switch No.5 of the master unit PCB"] --> B["Use '►' and '◄' button to mark "Func" in the 7 segment, and press '●' button."]
    B --> C["Use '►' and '◄' button to mark "Fn8" in the 7 segment, and press '●' button."]
    C --> D["Use '►' and '◄' button to select between "ON" and "OFF" in the 7 segment, and press '●' button."]
    D --> E["Decide Sump Heater control according to the set mode."]

Mode setting

• ON: Set to control the Sump Heater from the product
• OFF: Set not to control the Sump Heater from the product

CAUTION

• Request the function settings to the installation specialist during the outside unit installation.
• When the function is not used, set it to OFF.
• If the temperature of the outside unit installation place is 0^ or less, we recommend the connection and usage of Sump Heater.

IDU capacity adjusting

If the operation of indoor unit is more than 130%, the air flow is operated as low in the all indoor units.

How to set the mode

graph TD
    A["Turn on DIP switch No.5 of the master unit PCB"] --> B["Use '►' and '◄' button to mark "Func" in the 7 segment, and press '●' button."]
    B --> C["Use '►' and '◄' button to mark "Fn9" in the 7 segment, and press '●' button."]
    C --> D["Use '►' and '◄' button to select between "ON" and "OFF" in the 7 segment, and press '●' button."]
    D --> E["IDU capacity adjusting mode is set"]

Mode setting

• ON: Set to control the Low capacity mode
• OFF: Set not to control

CAUTION

- Ask an authorized technician to setting a function.

TEST RUN

Precaution before test run

1	Check whether the air is completely removed and the water supply is flowing smoothly.
2	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.
3	Check whether the power cable R, S, T and N 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 2.0MΩor above when measured.If the resistance is 2.0MΩor 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 accumulated within the compressor and the insulation resistance reduces to less than 2 MΩ. When the insulation resistance is 2 MΩor 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.
4	Check whether the liquid and gas pipes are open.
5	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.)

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.

graph TD
    A["Equipment design"] --> B["Water pipe system installation"]
    B --> C["Water supply pipe and product connection"]
    C --> D["Water supply system test run"]
    D --> E["Judging whether there is any problem with the water supply"]
    E --> F["Execute the product test run"]

    subgraph A
        G["Design the system including cooling tower, boiler, pump etc."]
        H["Check the equipment capacity (Water volume, temperature control range)."]
        I["Install the water pipe"]
        J["Connect the water pipe to the inlet/outlet of the product so that the water can be supplied to the product."]
    end

    subgraph B
        K["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."]
        L["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."]
        M["Clean all the strainers of water pipe including around outside units."]
    end

    subgraph C
        N["Execute the water supply system test run"]
        O["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."]
        P["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."]
        Q["Clean all the strainers of water pipe including around outside units."]
    end

    subgraph D
        R["Execute the test of water supply system without operating the product."]
        S["Check whether outside unit inlet/outlet flow rate complies to the product specification. Standard Water volume is 96LPM based on 10HP and 192LPM based on 20HP."]
        T["Check the water supply temperature, whether is OK"]
    end

    subgraph E
        U["After checking the normal condition of the water supply, execute the test run of the product."]
        V["To prevent the freezing of the heat exchanger when the product is open"]
    end

! WARNING

• 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.)

How to Cope with Abnormal Test Run

Item	Phenomenon	Cause Checkpoint and resolution
Whether heat water is supplied	CH24	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.	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.)
	CH32	Heat water not supplied or flow rate is insufficient	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.)
	CH34	Heat water not supplied or flow rate is insufficient(During Cooling)	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.)
	CH180	Heat water not supplied or flow rate is insufficient (During heating)	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.)

*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)

Maintenance of plate type 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 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 NaHCO3 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.

graph TD
    A["Gate valve(locked)"] --> B["Service plug"]
    B --> C["Strainer"]
    C --> D["Outflow water valve(locked)"]
    D --> E["Pump"]
    E --> F["Water-cooling type Multi V"]
    F --> G["Hose"]
    F --> H["Screening net"]
    I["Gate valve(locked)"] --> J["Water-cooling type Multi V"]

[Cleaning the panel heat exchanger]

Daily check/management

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.

Maintenance/Repair checklist

Checkpoint\Period (Year)

1

2

3

4

5

6

7

8

9

1

0

1

1

1

2

Product operating condition

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●

●

●

●

●

●

●

●

●

●

●

●

●

Heat exchanger cleaning (Wash)

●

●

●

Strainer cleaning

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●

Water quality check

●

●

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●

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Refrigerant leakage check

●

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Indoor unit filter cleaning

●

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1 3 1

CAUTION

• 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.

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,3rd LED of 7-segment indicates error number, 4th LED indicates unit number. ^* = 1: Master, 2: Slave 1, 3: Slave 2, 4: Slave 3)

Ex)

* Refer to the DX-Venitilation manual for DX-Venitilation error code.

Display Title Cause of Error
Indoor unit related error	0 1	-		Air temperature sensor of indoor unit
	0 2	-		Inlet pipe temperature sensor of indoor unit
	0 3	-		Communication error : wired remote controller < >indoor unit
	0 4	-		Drain pump
	0 5	-		Communication 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
	1 7	-		Inlet Air temperature sensor of FAU
Outside unit related error	2 1	*		Master outside unit inverter compressor IGBT Fault
	2 2	*		Inverter Board Input Over Current(RMS) of Master outside Unit
	2 3	*		Master outside unit inverter compressor DC link under-voltage
	2 4	*		Master outside unit high pressure switch
	2 5	*		Master outside unit input voltage over-voltage/under-voltage
	2	6	*	Master outside unit inverter compressor operation failure error
	2	8	*	Master outside unit inverter DC link over-voltage error
	2	9	*	Master outside unit inverter compressor overcurrent
	3	2	*	Master outside unit inverter compressordischarge temperature over-rise
	3	4	*	Master outside unit high pressure over-rise

Display Title Cause of Error
Outside unit related error	35	*		Master outside unit low pressure over-drop.	Compressor turned off due to master outside unit low pressure overdrop.
	36	*		Master Outside Unit Low Compression Ratio Lim- ited	Master Outside Unit stayed under low Compression limit for 3 minutes
	39	*		Master Outside unit Communication error between Master outside unit PFC and inverter board	Master Outside unit inverter compressor current detection (CT) sen- sor disconnection or short circuit
	40	*		Master outside unit inverter compressor CT sensor error	Master outside unit inverter compressor current detection (CT) sen- sor disconnection or short circuit
	41	*		Master outside unit inverter compressor discharge temperature sensor error	Master outside unit inverter compressor discharge temperature sensor disconnection or short circuit
	42	*		Master Outside Unit Low Pressure Sensor Fault	Master Outside Unit Low Pressure Sensor open or short
	43	*		Master Outside Unit High Pressure Sensor Fault	Master Outside Unit High Pressure Sensor open or short
	44	*		Master Outside unit air temperature sensor error	Master Outside unit air temperature sensor disconnection or short circuit
	46	*		Master outside unit suction temperature sensor error	Master outside unit suction temperature sensor disconnection or short circuit
	49	*		Master outside unit IGBT temperature sensor error	Master out side unit IGBT temperature sensor disconnection or short circuit
	50	*		Master outside unit 3 phase power missing	Master outside unit power line phase missing
	51	*		Over-capacity (Indoor unit capacity sum is exces- sive) connection	Excessive connection of indoor unit connection display value (Differ- ent from outside unit)
	52	*		Communication error: inverter PCB →Main PCB	When the inverter controller signal is not received from the master outside unit inverter controller
	53	*		Communication error: indoor unit →Main PCB of Outside Unit	When the indoor unit control signal is not received from the master Outside unit controller
	57	*		Communication error: Main PCB →inverter PCB	Failing to receive inverter contoroller signal at Master Outside Unit controller
	59	*		Wrong setting between master and slave outside unit	When geothermal mode setting is different(Fn 2 setting)
	60	*		Master outside unit inverter PCB EEPROM error	Master outside unit inverter PCB EEPROM ACCESS error
	62	*		Master outside unit inverter IGBT over-rise error	Master outside unit inverter IGBT when the temperature rises above 110 °C
	65	*		Master outside unit inverter IGBT temperature sen- sor error	Master outside unit inverter IGBT temperature sensor disconnec- tion or short circuit
	71	*		PFC CT Sensor Error of Master Outside Unit	Master Outside Unit PFC CT Sensor open or short
	86	*		Master outside unit master PCB EEPROM error	Communication error between master outside unit master MICOM andEEPROM or EEPROM missing
	8	8	*	PFC PCB EEPROM error	Communication error between master outside unit master PFC and EEPROM or EEPROM missing
	104	*		Communication Error Between Master Outside Unit and Other Outside Unit	Failing to receive Slave Unit signal at main PCB of Master Outside Unit
	113	*		Master Outside Unit Liquid pipe Temperature Sen- sor Error	Liquid pipe temperature sensor of Master Outside Unit is open or short
	115	*		Master Outside Unit Subcooling Outlet Temperature Sensor Error	Master Outside Unit Subcooling Outlet Temperature Sensor open or short
	1	16	*	Master Outside Unit Oil Level Sensor Error	Oil Level Sensor of Master Outside Unit is open or short
Outside unit related error	1	4	5	*	Master outside unit Main Board - External Board communication Error
	1	5	1	*	Failure of operation mode conversion at Master Outside Unit
	1	8	0	*	Plate type heat exchanger freeze prevention
	1	8	1	*	Water temperature sensor error
	1	8	2	*	Communication error between MICOMs of external pcb
HR Unit related error	2 0 0		1		Searching pipe Error Failure of automatic addressing of valves
	2 0 1 #h			HR unit1 Liquid sensor error Liquid pipe sensor of HR unit open or short
	2	0	2	#h	HR unit1 Sub Cooling Pipe sensor error
	2 0 3 #h			HR unit1 Sub Cooling Pipe Out sensor error Sub Cooling Pipe Out sensor of HR unit. open or short
	2 0 4 #h			Communication error Failing to receive HR unit signal at 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.

Introduction

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

Limiting concentration is the limit of Freon gas concentration where immediate measures can be taken without hurting human body when refrigerant leaks in the air. The limiting concentration shall be described in the unit of kg/m ^3 (Freon gas weight per unit air volume) for facilitating calculation.

Limiting concentration: 0.44kg/m ^3 (R410A)

graph TD
    A["Outside unit"] --> B["(No.1 system)"]
    B --> C["Indoor unit"]
    C --> D["Flow of refrigerator"]
    D --> E["Room where refrigerant leaks (Refrigerant of the whole No.1 system flows out.)"]
    E --> F["{}"]

Checking procedure of 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.

Amount of replenished refrigerant per one outside + unit system | Amount of replenished refrigerant at factory shipment + Amount of additional replenished refrigerant depending on piping length or piping diameter at customer Total amount of replenished refrigerant in refrigerant facility (kg) | Amount of additionally replenished refrigerant depending on piping length or piping diameter at customer 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.

Calculate minimum room capacity

Calculate room capacity by regarding a portion as one room or the smaller room.

- Without partition

- With partition and with opening which serve as passage of air to adjoining room

Indoor unit Outside unit

Indoor unit Opening Partition Outside unit In the case of opening without door, or 0.15 % or more openings (to floor space), both above and below door)

- With partition and without opening which serve as passage of air to adjoining room

graph TD
    A["Indoor unit"] --> B["Smallest room"]
    A --> C["Indoor unit"]
    D["Outside unit"] --> A

Calculate refrigerant concentration

$$ \frac{\text{Total amount of replenishedrefrigerant in refrigerant facility (kg)}}{\text{Capacity of smallest room where indoor unit is installed (m}^3\text{)}} = \underset{\text{(R410A)}}{\text{Refrigerant concentration(kg/m}^3\text{)}} \tag{R410A} $$

- 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.

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 unit refrigerant qty.

graph TD
    A["Countermeasure 2"] --> B["Indoor unit"]
    C["Gas leak alarm"] --> B
    D["Mechanical ventilator"] --> B
    B --> E["Opening effective to ventilation"]
    style A fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    style D fill:#f9f,stroke:#333
    style E fill:#ccf,stroke:#333

Pay a special attention to the place, such as a basement, etc. where refrigerant can stay, since refrigerant is heavier than air.

COOLING TOWER APPLIED METHOD

graph TD
    A["Open type cooling tower"] --> B["1st side"]
    A --> C["2nd side"]
    B --> D["Heat exchange"]
    C --> D
    D --> E["Heat exchanger"]
    E --> F["Output 1"]
    E --> G["Output 2"]
    E --> H["Output 3"]

[Open type cooling tower + Middle 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 maintained constantly.

graph TD
    A["Closed type cooling tower"] --> B["Unit 1"]
    A --> C["Unit 2"]
    A --> D["Unit 3"]
    A --> E["Unit 4"]
    A --> F["Unit 5"]

CAUTION

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.

WATER SOLENOID VALVE CONTROL

Central Control(Use DDC Port)

graph TD
    A["Water In"] --> B["Solenoid Valve"]
    B --> C["Water Out"]
    C --> D["Main PCB"]
    D --> E["DDC"]
    E --> F["BMS"]
    F --> G["PI 485"]
    G --> H["CN 18 (220 V Out)"]
    G --> I["CN 22 (to DDC)"]
    H --> J["1(L)"]
    H --> K["2(N)"]
    H --> L["3(L)"]
    H --> M["4(N)"]
    I --> N["1(L)"]
    I --> O["2(N)"]
    I --> P["3(L)"]
    I --> Q["4(N)"]
    J --> R["Main PCB"]
    K --> R
    L --> R
    M --> R
    N --> R
    O --> R
    P --> R
    Q --> R
    R --> S["BMS : Building Management System"]

Individual Control(Use 220V Output Port)

Water In Water Out CN 18 (220 V Out) CN 22 (to DDC) Main PCB Solenoid Valve 1(L) 2(N) 3(L) 4(N) * Refer to setting the function and turn on the power When you individual control for water solenoid valve control.

INSTALLATION GUIDE FOR HAR- MONICS AND FLICKER

The below Installation guide is limited applicable only for model

Model : ARWB140LAS4, ARWB120LAS4, ARWB100LAS4, ARWB080LAS4

Installation Guide for Harmonics (EN 61000-3-2 & EN 61000-3-12)

☐ This equipment complies with IEC (EN) 61000-3-2.
☒ This equipment complies with IEC (EN) 61000-3-12 in harmonic currents emission limits corresponding Rsce =33.
☐ This equipment complies with IEC (EN) 61000-3-12 provided that the short-circuit power Ssc is greater than or equal to 4671 kVA at the interface point between the user's supply and the public system. It is the responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with a short-circuit power Ssc greater than or equal to 4671 kVA."

Installation Guide for Flicker (EN 61000-3-3 & EN 61000-3-11)

☐ This equipment complies with IEC (EN) 61000-3-3.
☒ This equipment complies with reference impedance for IEC (EN) 61000-3-11.
☐ This device is intended for the connection to a power supply system with a maximum permissible system impedance Z_MAX of at the interface point (power service box) of the user's supply. The user has to ensure that this device is connected only to a power supply system which fulfills the requirement above. If necessary, the user can ask the public power supply company for the system impedance at the interface point.

The below Installation guide is limited applicable only for model

Model : ARWB200LAS4, ARWB180LAS4, ARWB160LAS4

Installation Guide for Harmonics (EN 61000-3-2 & EN 61000-3-12)

☐ This equipment complies with IEC (EN) 61000-3-2.
☐ This equipment complies with IEC (EN) 61000-3-12 in harmonic currents emission limits corresponding Rsce =33.
This equipment complies with IEC (EN) 61000-3-12 provided that the short-circuit power Ssc is greater than or equal to 5409 kVA at the interface point between the user's supply and the public system. It is the responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with a short-circuit power Ssc greater than or equal to 5409 kVA."

Installation Guide for Flicker (EN 61000-3-3 & EN 61000-3-11)

☐ This equipment complies with IEC (EN) 61000-3-3.
☒ This equipment complies with reference impedance for IEC (EN) 61000-3-11.
☐ This device is intended for the connection to a power supply system with a maximum permissible system impedance Z_MAX of at the interface point (power service box) of the user's supply. The user has to ensure that this device is connected only to a power supply system which fulfills the requirement above. If necessary, the user can ask the public power supply company for the system impedance at the interface point.

Model Designation

Product information

• Product Name : Air conditioner
- Model Name :

Product Sales Name Model Factory Name

ARWx***LAy4 series

$$ \begin{array}{l} x = N, B (\text { Heat pump }), V (\text { Cooling only }) \ y = S (\text { Basic function }), \ E (\text { Additional function related to performance }) \ ^ { * } = \text { Numeric; (Cooling capacity) } \ \end{array} $$

- Additional information : Serial number is refer to the bar code on the product.

Airborne Noise Emission

The sound pressure of this product is below 70dB.

** The noise level can vary depending on the site.

The figures quoted are emission level and are not necessarily safe working levels.

Whilst there is a correlation between the emission and exposure levels, this cannot be used reliably to determine whether or not further precautions are required.

Factor that influence the actual level of exposure of the workforce include the characteristics of the work room and the other sources of noise, i.e. the number of equipment and other adjacent processes and the length of time for which an operator exposed to the noise. Also, the permissible exposure level can vary from country to country.

This information, however, will enable the user of the equipment to make a better evaluation of the hazard and risk.

LG

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