ARUV180LTS4 - Air-conditioner LG - Free user manual and instructions

Product Type	Outdoor Unit of Multi-Split Air Conditioner
Model	ARUV180LTS4
Horsepower (HP)	18
Dimensions (W×H×D)	1,240 × 1,680 × 760 mm (48-13/16 × 66-5/32 × 29-29/32 in)
Net Weight	270 kg (595 lbs)
Power Supply	3∅, 380 V, 60 Hz or 3∅, 380-415 V, 50 Hz
Refrigerant Type	R410A
Precharged Refrigerant Amount	6.5 kg (14.3 lbs)
Pipe Connections (Liquid / Gas)	Liquid: 15.88 mm (5/8 in); Gas: 28.58 mm (1-1/8 in)
Max. Connectable Indoor Units	29 (45 with conditional allowance)
Combination Ratio	50% to 200% (130% for guaranteed operation)
Main Features	Inverter compressor, MULTI V™ IV technology, energy saving modes, self-diagnosis, auto-addressing, group number setting, static pressure compensation, night low noise function
Safety Precautions	Installation by qualified technician, dedicated circuit and breaker, proper grounding, avoid flammable gases, use specified refrigerant only
Maintenance	Clean air filter every 2 weeks; periodic heat exchanger cleaning in coastal areas; annual professional check
Operating Temperature Range	Not explicitly stated; typical for R410A systems: cooling -10°C to 43°C, heating -15°C to 24°C
Warranty	Refer to dealer; standard manufacturer warranty applies

Frequently Asked Questions - ARUV180LTS4 LG

What type of air conditioner is the LG ARUV180LTS4?

The LG ARUV180LTS4 is an outdoor unit for a multi-split air conditioning system, part of the MULTI V™ IV series. It is designed to connect multiple indoor units.

What is the power supply requirement for this outdoor unit?

The unit requires a 3-phase power supply of 380V at 60Hz or 380-415V at 50Hz. A dedicated circuit and breaker must be installed by a licensed electrician.

How many indoor units can be connected to the ARUV180LTS4?

Up to 29 indoor units can be connected under normal conditions, and up to 45 units under specific conditional allowances. The combination ratio must be within 50% to 200%.

What type of refrigerant does this unit use, and how much is precharged?

The unit uses R410A refrigerant, which is environmentally friendly with zero ozone depletion potential. It is precharged with 6.5 kg (14.3 lbs) of refrigerant.

What are the pipe connection sizes for the ARUV180LTS4?

The liquid pipe connection is 15.88 mm (5/8 inch) and the gas pipe connection is 28.58 mm (1-1/8 inch). Proper flaring and brazing are required.

How can I save energy while using this air conditioner?

To save energy, avoid excessive cooling, use blinds to block sunlight, keep doors and windows closed, adjust airflow direction, use fan speed to quickly reach desired temperature, ventillate regularly, and clean the air filter every 2 weeks.

What safety precautions should be taken during installation?

Installation must be performed by authorized personnel following national wiring standards. Always ground the product, use a dedicated circuit, and never install near flammable gases. Ensure proper foundation to withstand weight and vibration.

How does the self-diagnosis function work?

The unit has a self-diagnosis function that displays error codes on the outdoor unit PCB. It can diagnose issues like compressor faults, sensor errors, communication failures, and more. Refer to the manual for specific codes.

What maintenance is required for the ARUV180LTS4?

Regular maintenance includes cleaning the air filter every 2 weeks to prevent blockages, and for coastal installations, periodic cleaning of the heat exchanger to remove salt. Annual professional inspection is recommended.

Can this unit be installed near the seaside?

Yes, but direct exposure to sea wind must be avoided. Install a windbreak (concrete) at least 150% of unit height and width, with 70 cm clearance for airflow. Regular cleaning of salt deposits is necessary to prevent corrosion.

USER MANUAL ARUV180LTS4 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.your set and retain it for future reference.

MULTI V™ IV

Black and white barcode image with vertical lines above and below the bars

P/NO : MFL67221417

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.
• Speed up the fan to cool or warm indoor air quickly, in a short period of time.
• 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.
• Prepare for strong wind or earthquake and install the unit at the specified place. - Improper installation may cause the unit to topple and result in injury.
• 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 outdoor 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 outdoor 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 outdoor 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.

- Keep the unit away from children. The heat exchanger is very sharp.

- It can cause the injury, such as cutting the finger. Also the damaged fin may result in degradation of capacity.

- When installing the unit in a hospital, communication station, or similar place, provide sufficient protection against noise.

- The inverter equipment, private power generator, high-frequency medical equipment, or radio communication equipment may cause the air conditioner to operate erroneously, or fail to operate. On the other hand, the air conditioner may affect such equipment by creating noise that disturbs medical treatment or image broadcasting.

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

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

Operation

- Do not use the air conditioner in special environments.

- Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of the air conditioner or damage its parts.

- Do not block the inlet or outlet.

- It may cause failure of appliance or accident.

- Make the connections securely so that the outside force of the cable may not be applied to the terminals.

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

- Be sure the installation area does not deteriorate with age.

- If the base collapses, the air conditioner could fall with it, causing property damage, product failure, or personal injury.

• 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 outdoor unit, suspending it at the specified positions on the unit base. Also support the outdoor 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.
• Do not insert hands or other objects through the air inlet or outlet while the air conditioner is plugged in.
• There are sharp and moving parts that could cause personal injury.

TABLE OF CONTENTS

2 TIPS FOR SAVING ENERGY

3 IMPORTANT SAFETY INSTRUCTIONS

8 INSTALLATION PROCESS

9 OUTDOOR UNITS INFORMATION

14 ENVIRONMENT-FRIENDLY ALTERNATIVEREFRIGER-ANT R410A

15 Individual Installation

17 LIFTING METHOD

18 INSTALLATION

18 The location of the Anchor bolts

19 Foundation for Installation

20 Preparation of Piping

23 Plumbing materials and storage methods

25 REFRIGERANT PIPING INSTALLATION

25 Precautions on Pipe connection / Valve operation

26 PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

26 Preparation Work

27 Pipe Drawing Out during Single / Series connection

29 Refrigerant piping system

42 Refrigerant charging

43 Distribution Method

44 Branch pipe Fitting

48 Leak Test and Vacuum drying

50 Vacuum Mode

51 Thermal insulation of refrigerant piping

52 ELECTRICAL WIRING

52 Caution

54 Control box and connecting position of wiring

55 Communication and Power Cables

56 Wiring of main power supply and equipment capacity

57 Field Wiring

63 Checking the setting of outdoor units

64 Automatic Addressing

67 Group Number setting

68 Static pressure compensation mode

69 Night Low Noise Function

70 Setting the ODU address

71 Target pressure adjusting

72 Self-Diagnosis Function

83 CAUTION FOR REFRIGERANT LEAK

83 Introduction

83 Checking procedure of limiting concentration

85 INSTALLATION GUIDE AT THE SEASIDE

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"]

    B --> Q["Take account of gradient of drain piping"]
    Q --> R["Check model name to make sure the fitting is made correctly"]
    R --> S["Special attention to dryness, cleanness and tightness"]
    S --> T["Adjust to downward gradient"]
    T --> U["Make sure airflow is sufficient"]
    U --> V["Make sure no gaps are left where the insulating materials are joined"]
    V --> W["Multiple core cable must not be used. (suitable cable should be selected)"]

    C --> X["Outdoor unit foundation work"]
    X --> Y["Installation of outdoor unit"]
    Y --> Z["Avoid short circuits and ensure sufficient space is allowed for service"]

    Z --> AA["The foundation must be level even"]
    AA --> AB["Indicate clearly who will be responsible for switch setting."]
    Z --> AC["In the final check for 24 hours at 3.8 MPa(38.7 kgf/cm²) there must be no drop in pressure."]
    Z --> AD["The vacuum pump used must have a capacity of reaching at least 5 torr, more than 1 hour"]
    AD --> AE["Recharge correctly as calculated in this manual. and record the amount of added refrigerant"]
    AE --> AF["Make sure there are no gaps left between the facing materials used on the ceiling"]
    AF --> AG["Refer to automatic addressing flowchart Preheat the crank case with the electrical heater for more than 6 hours."]
    AG --> AH["Run each indoor unit in turn to make sure the pipe work has been fitted correctly"]
    AH --> AI["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.)

OUTDOOR UNITS INFORMATION

CAUTION

Combination Ratio(50\~200%)

Outdoor Number Connection	Ratio
Single outdoor units 200%
Double outdoor units 160%
Triple outdoor units 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%, the airflow is operated as low in the all indoor units.
- The number of ( ) means the number of Max. connectable indoor units, when the connected capacity of indoor units is in the table above.

Power Supply : 3∅, 380V, 60Hz or 3∅, 380 - 415V, 50Hz Model Name : A(B)RUV***LTS4

Unit 1 Outdoor unit
HP			10 12 14
Model Name	Combination Unit		A(B)RUV100LTS4 A(B)	RUV120LTS4 A(B)RUV140LTS4
	Independent Unit A(B)RUV1		00LTS4 A(B)RUV120LTS4	A(B)RUV140LTS4
Pipe Connections	Liquid	mm(inch)	9.52(3/8)	12.7(1/2)	12.7(1/2)
	Gas mm(inch)	22.2(7/8) 28.58(1 1/8) 28.58(1 1/8)
Dimensions(WxHxD)		mm (920×1,680×760)×1 (920×1,680×760)×1 (920×1,680×760)×1
		inch	(36-7/32×66-5/32×29-29/32)×1 (36-7/32×66-5/32×29-29/32)×1 (36-7/32×66-5/32×29-29/32)×1
Net Weight		kg 185 × 1 195 × 1 195 × 1
		Ibs	408 × 1	430 × 1	430 × 1
Refrigerant	Refrigerant name		R410A	R410A	R410A
	Precharged Amount	kg	5	5	5
		Ibs	11.0	11.0	11.0
Number of maximum connectable indoor units			16(25)	20(30)	23(35)

Unit 1 Outdoor unit
HP			16 18 20
Model Name	Combination Unit		A(B)RUV160LTS4 A(B)	RUV180LTS4 A(B)RUV200LTS4
	Independent Unit A(B)RUV1		60LTS4 A(B)RUV180LTS4	A(B)RUV200LTS4
Pipe Connections	Liquid	mm(inch)	12.7(1/2)	15.88(5/8)	15.88(5/8)
	Gas mm(inch)	28.58(1 1/8) 28.58(1 1/8) 28.58(1 1/8)
Dimensions(WxHxD)		mm	(1,240×1,680×760)×1	(1,240×1,680×760)×1	(1,240×1,680×760)×1
		inch	(48-13/16×66-5/32×29-29/32)×1	(48-13/16×66-5/32×29-29/32)×1	(48-13/16×66-5/32×29-29/32)×1
Net Weight		kg 235 × 1 270 × 1 270 × 1
		Ibs	518 × 1	595 × 1	595 × 1
Refrigerant	Refrigerant name		R410A	R410A	R410A
	Precharged Amount	kg	6	6.5	6.5
		Ibs	13.2	14.3	14.3
Number of maximum connectable indoor units			26(40)	29(45)	32(50)
Unit 2 Outdoor units
HP			22 24 26
Model Name	Combination Unit		A(B)RUV220LTS4 A(B)	RUV240LTS4 A(B)RUV260LTS4
	Independent Unit		A(B)RUV120LTS4 A(B)	RUV120LTS4 A(B)RUV140LTS4
			A(B)RUV100LTS4 A(B)	RUV120LTS4 A(B)RUV120LTS4
Pipe Connections	Liquid	mm(inch)	15.88(5/8)	15.88(5/8)	15.88(5/8)
	Gas mm(inch)	28.58(1 1/8)	34.9(1 3/8)	34.9(1 3/8)
Dimensions(WxHxD)		mm (920×1,680×760)×2 (920×1,680×760)×2 (920×1,680×760)×2
		inch	(36-7/32×66-5/32×29-29/32)×2	(36-7/32×66-5/32×29-29/32)×2	36-7/32×66-5/32×29-29/32)×2
Net Weight		kg 185 × 1 + 195 × 1 195 × 2 195 × 2
		Ibs 408 × 1 + 430 × 1 430 × 2 430 × 2
Refrigerant	Refrigerant name		R410A	R410A	R410A
	Precharged Amount	kg 5 × 2	5 × 2	5 × 2
		Ibs	11.0×2	11.0×2	11.0×2
Number of maximum connectable indoor units			35(44)	39(48)	42(52)

Unit 2 Outdoor units
HP			28 30 32
Model Name	Combination Unit		A(B)RUV280LTS4 A(B)	RUV300LTS4 A(B)RUV320LTS4
	Independent Unit		A(B)RUV160LTS4 A(B)	RUV180LTS4 A(B)RUV200LTS4
			A(B)RUV120LTS4 A(B)	RUV120LTS4 A(B)RUV120LTS4
Pipe Connections	Liquid	mm(inch)	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Gas mm(inch)	34.9(1 3/8) 34.9(1 3/8) 34.9(1 3/8)
Dimensions(WxHxD)		mm	(1,240×1,680×760)×1+(920×1,680×760)×1	(1,240×1,680×760)×1+(920×1,680×760)×1	(1,240×1,680×760)×1+(920×1,680×760)×1
		inch	(48-13/16×66-5/32×29-29/32)×1+(36-7/32×66-5/32×29-29/32)	(48-13/16×66-5/32×29-29/32)×1+(36-7/32×66-5/32×29-29/32)	(48-13/16×66-5/32×29-29/32)×1+(36-7/32×66-5(32×29-29/32)
Net Weight		kg 235	×1 + 195 × 1 270	×1 + 195 × 1 270	×1 + 195 × 1
		Ibs 518	×1 + 430 × 1 595	×1 + 430 × 1 595	×1 + 430 × 1
Refrigerant	Refrigerant name		R410A	R410A	R410A
	Precharged Amount	kg 6 + 5	6.5 + 5	6.5 + 5
		Ibs	13.2+11.0	14.3+11.0	14.3+11.0
Number of maximum connectable indoor units			45(56)	49(60)	52(64)

Unit 2 Outdoor units
HP			34 36 38
Model Name	Combination Unit		A(B)RUV340LTS4 A(B)	RUV360LTS4 A(B)RUV380LTS4
	Independent Unit		A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV140LTS4 A(B)	RUV160LTS4 A(B)RUV180LTS4
Pipe Connections	Liquid	mm(inch)	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Gas mm(inch)	34.9	(1 3/8) 41.3(1 5/8) 41.3(1 5/8)
Dimensions(WxHxD)		mm	(1,240×1,680×760)×1+(920×1,680×760)×1	(1,240×1,680×760)×2	(1,240×1,680×760)×2
		inch	(48-13/16×66-5/32×29-29/32)×1+(36-7/32×66-5/32×29-29/32)	(48-13/16×66-5/32×29-29/32)×2	(48-13/16×66-5/32×29-29/32)×2
Net Weight		kg 270	×1 + 195 × 1 270	×1 + 235 × 1 270 × 2
		Ibs 595	×1 + 430 × 1 595	×1 + 518 × 1 595 × 2
Refrigerant	Refrigerant name		R410A	R410A	R410A
	Precharged Amount	kg	6.5 + 5	6.5 + 6	6.5 × 2
		Ibs	14.3+11.0	14.3+13.2	14.3×2
Number of maximum connectable indoor units			55(64)	58(64)	61(64)
Unit 2 Outdoor units			3	Outdoor units
HP			40 42 44
Model Name	Combination Unit		A(B)RUV400LTS4 A(B)	RUV420LTS4 A(B)RUV440LTS4
	Independent Unit		A(B)RUV200LTS4 A(B)	RUV180LTS4 A(B)RUV200LTS4
			A(B)RUV200LTS4 A(B)	RUV140LTS4 A(B)RUV140LTS4
				A(B)RUV100LTS4 A(B)	RUV100LTS4
Pipe Connections	Liquid	mm(inch)	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Gas mm(inch)	41.3(1 5/8) 41	.3(1 5/8) 41.3(1 5/8)
Dimensions(WxHxD)		mm (1,240×1,680×760)×2		(1,240×1,680×760)×1+(920×1,680×760)×2	(1,240×1,680×760)×1+(920×1,680×760)×2
		inch	(48-13/16×66-5/32×29-29/32)×2	(48-13/16×66-5/32×29-29/32)×1+(36-7/32×66-5/32×29-29/32)×2	(48-13/16×66-5/32×29-29/32)×1+(36-7/32×66-5/32×29-29/32)×2
Net Weight		kg 270 × 2		270 × 1 + 195 × 1 + 185 × 1	270 × 1 + 195 × 1 + 185 × 1
		Ibs 595 × 2		595 × 1 + 430 × 1 + 408 × 1	595 × 1 + 430 × 1 + 408 × 1
Refrigerant	Refrigerant name R410A R410A R410A
	Precharged Amount	kg 6.5 × 2 6.5 + (5 × 2)		6.5 + (5 × 2)
		Ibs 14.3×2	14.3+(1 1.0×2)	14.3+(1 1.0×2)
Number of maximum connectable indoor units			64 64 64

Unit			3 Outdoor units
HP			46 48 50
Model Name	Combination Unit		A(B)RUV460LTS4 A(B)	RUV480LTS4 A(B)RUV500LTS4
	Independent Unit		A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV160LTS4 A(B)	RUV180LTS4 A(B)RUV200LTS4
			A(B)RUV100LTS4 A(B)	RUV100LTS4 A(B)RUV100LTS4
Pipe Connections	Liquid	mm(inch)	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Gas mm(inch)	41.3(1 5/8) 41	.3(1 5/8) 41.3(1 5/8)
Dimensions(WxHxD)		mm	(1,240×1,680×760)×2+(920×1,680×760)×1	(1,240×1,680×760)×2+(920×1,680×760)×1	(1,240×1,680×760)×2+(920×1,680×760)×1
		inch	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66-5/32×29-29/32)	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66-5/32×29-29/32)	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66-5-32×29-29/32)
Net Weight		kg	270 × 1 + 235 × 1 + 185 × 1	270 × 2 + 185 × 1	270 × 2 + 185 × 1
		Ibs	595 × 1 + 518 × 1 + 408 × 1	595 × 2 + 408 × 1	595 × 2 + 408 × 1
Refrigerant	Refrigerant name R410A R410A R410A
	Precharged Amount	kg 6.5 + 6 + 5	(6.5 × 2) + 5	(6.5 × 2) + 5
		Ibs	14.3+13.2+11.0	(14.3×2)+11.0	14.3+13.2+11.0
Number of maximum connectable indoor units			64 64 64

Unit			3 Outdoor units
HP			52 54 56
Model Name	Combination Unit		A(B)RUV520LTS4 A(B)	RUV540LTS4 A(B)RUV560LTS4
	Independent Unit		A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV120LTS4 A(B)	RUV140LTS4 A(B)RUV160LTS4
Pipe Connections	Liquid	mm(inch)	19.05(3/4)	19.05(3/4)	19.05(3/4)
	Gas mm(inch)	41.3(1 5/8) 41	.3(1 5/8) 41.3(1 5/8)
Dimensions(WxHxD)		mm	(1,240×1,680×760)×2+(920×1,680×760)×1	(1,240×1,680×760)×2+(920×1,680×760)×1	(1,240×1,680×760)×3
		inch	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66-5/32×29-29/32)	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66-5/32×29-29/32)	(48-13/16×66-5/32×29-29/32)×3
Net Weight		kg	270 × 2 + 195 × 1	270 × 2 + 195 × 1	270 × 2 + 235 × 1
		Ibs	595 × 2 + 430 × 1	595 × 2 + 430 × 1	595 × 2 + 518 × 1
Refrigerant	Refrigerant name R410A R410A
	Precharged Amount	kg	(6.5 × 2) + 5	(6.5 × 2) + 5	(6.5 × 2) + 6
		Ibs	(14.3×2)+11.0	(14.3×2)+11.0	(14.3×2)+13.2
Number of maximum connectable indoor units			64 64 64
Unit 3 Outdoor units			4	Outdoor units
HP			58 60 62
Model Name	Combination Unit		A(B)RUV580LTS4 A(B)	RUV600LTS4 A(B)RUV620LTS4
	Independent Unit		A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV180LTS4
			A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV160LTS4
			A(B)RUV180LTS4 A(B)	RUV200LTS4 A(B)RUV140LTS4
					A(B)RUV140LTS4
Pipe Connections	Liquid	mm(inch)	19.05(3/4)	19.05(3/4)	22.2(7/8)
	Gas mm(inch)	41.3(1 5/8) 4	1.3(1 5/8) 44.5(1 3/4)
Dimensions(WxHxD)		mm (1,2	40×1,680×760)×3 (1,240×1,680×760)×3		(1,240×1,680×760)×2+(920×1,680×760)×2
		inch	(48-13/16×66-5/32×29-29/32)×3	(48-13/16×66-5/32×29-29/32)×3	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66-5/32×29-29/32)×2
Net Weight		kg 270	×3 270 × 3		270 × 1 + 235 × 1 + 195 × 2
		Ibs 595	×3 595 × 3		595 × 1 + 518 × 1 + 430 × 2
Refrigerant	Refrigerant name R410A		R410A	R410A
	Precharged Amount	kg	6.5 × 3	6.5 × 3	6.5 + 6 + (5 × 2)
		Ibs	14.3×3	14.3×3	14.3+13.2+(11.0×2)
Number of maximum connectable indoor units			64 64 64

Unit			4 Outdoor units
HP			64 66 68
Model Name	Combination Unit		A(B)RUV640LTS4 A(B)	RUV660LTS4 A(B)RUV680LTS4
	Independent Unit		A(B)RUV180LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV180LTS4 A(B)	RUV180LTS4 A(B)RUV200LTS4
			A(B)RUV140LTS4 A(B)	RUV140LTS4 A(B)RUV140LTS4
			A(B)RUV140LTS4 A(B)	RUV140LTS4 A(B)RUV140LTS4
Pipe Connections	Liquid	mm(inch)	22.2(7/8)	22.2(7/8)	22.2(7/8)
	Gas mm(inch)	44.5(1 3/4)	53.98(2 1/8)	53.98(2 1/8)
Dimensions(WxHxD)		mm	(1,240×1,680×760)×2+(920×1,680×760)×2	(1,240×1,680×760)×2+(920×1,680×760)×2	(1,240×1,680×760)×2+(920×1,680×760)×2
		inch	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66-5/32×29-29/32)×2	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66-5/32×29-29/32)×2	(48-13/16×66-5/32×29-29/32)×2+(36-7/32×66 - 5 / 32 × 29 - 29 / 32)×2
Net Weight		kg	270 × 2 + 195 × 2	270 × 2 + 195 × 2	270 × 2 + 195 × 2
		Ibs	595 × 2 + 430 × 2	595 × 2 + 430 × 2	595 × 2 + 430 × 2
Refrigerant	Refrigerant name R410A		R410A	R410A
	Precharged Amount	kg (6.5 × 2) + (5 × 2) (6.5 × 2) + (5 × 2)		(6.5 × 2) + (5 × 2)
		Ibs	(14.3×2)+(11.0×2)	(14.3×2)+(11.0×2)	(14.3×2)+(11.0×2)
Number of maximum connectable indoor units			64 64 64

Unit			4 Outdoor units
HP			70 72 74
Model Name	Combination Unit		A(B)RUV700LTS4 A(B)	RUV720LTS4 A(B)RUV740LTS4
	Independent Unit		A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV160LTS4 A(B)	RUV180LTS4 A(B)RUV180LTS4
			A(B)RUV140LTS4 A(B)	RUV140LTS4 A(B)RUV160LTS4
Pipe Connections	Liquid	mm(inch)	22.2(7/8)	22.2(7/8)	22.2(7/8)
	Gas mm(inch)	53.98(2 1/8)	53.98(2 1/8)	53.98(2 1/8)
Dimensions(WxHxD)		mm	(1,240×1,680×760)×3+(920×1,680×760)×1	(1,240×1,680×760)×3+(920×1,680×760)×1	(1,240×1,680×760)×4
		inch	(48-13/16×66-5/32×29-29/32)×3+(36-7/32×66-5/32×29-29/32)×1	(48-13/16×66-5/32×29-29/32)×3+(36-7/32×66-5/32×29-29/32)×1	(48-13/16×66-5/32×29-29/32)×4
Net Weight		kg	270 × 2 + 235 × 1 + 195 × 1	270 × 3 + 195 × 1	270 × 3 + 235 × 1
		lbs	595 × 2 + 518 × 1 + 430 × 1	595 × 3 + 430 × 1	595 × 3 + 518 × 1
Refrigerant	Refrigerant name R410A		R410A	R410A
	Precharged Amount	kg	(6.5 × 2) + 6 + 5	(6.5 × 3) + 5	(6.5 × 3) + 6
		lbs	(14.3×2)+13.2+11.0 (14.3×3)+11.0	(14.3×3)+13.2
Number of maximum connectable indoor units			64 64 64
Unit 4 Outdoor units
HP			76 78 80
Model Name	Combination Unit		A(B)RUV760LTS4 A(B)	RUV780LTS4 A(B)RUV800LTS4
	Independent Unit		A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV200LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV180LTS4 A(B)	RUV200LTS4 A(B)RUV200LTS4
			A(B)RUV180LTS4 A(B)	RUV180LTS4 A(B)RUV200LTS4
Pipe Connections	Liquid	mm(inch)	22.2(7/8)	22.2(7/8)	22.2(7/8)
	Gas mm(inch)	53.98(2 1/8)	53.98(2 1/8) 53.98(2 1/8)
Dimensions(WxHxD)		mm (1,240×1,680×760)×4 (1,240×1,680×760)×4 (1,240×1,680×760)×4
		inch	(48-13/16×66-5/32×29-29/32)×4	(48-13/16×66-5/32×29-29/32)×4	(48-13/16×66-5/32×29-29/32)×4
Net Weight		kg 270	×4 270 ×4 270 ×4
		lbs 595	×4 595 ×4 595 ×4
Refrigerant	Refrigerant name R410A R410A R410A
	Precharged Amount	kg	6.5 ×4 6.5 ×4 6.5 ×4
		lbs 14.3×4 14.3×4 14.3×4
Number of maximum connectable indoor units			64 64 64

ENVIRONMENT-FRIENDLY 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. These days the developed countries have approved it as the environment-friendly refrigerant and encouraged to use it widely to prevent environment pollution.

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 outdoor unit, which will meet the following conditions:

• No direct thermal radiation from other heat sources
• No possibility of annoying neighbors by noise from unit
• No exposition to strong wind
• With strength which bears weight of unit
• Note that drain flows out of unit when heating
• With space for air passage and service work shown next
• Because of the possibility of fire, do not install unit to the space where generation, inflow, stagnation, and leakage of combustible gas is expected.

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

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

- It is recommended to fence round the outdoor unit in order to prevent any person or animal from accessing the outdoor unit.

- If installation site is area of heavy snowfall, then the following directions should be observed.

- Make the foundation as high as possible.

- Fit a snow protection hood.

- Select installation location considering following conditions to avoid bad condition when additionally performing defrost operation.

- Install the outdoor unit at a place well ventilated and having a lot of sunshine in case of installing the product at a place With a high humidity in winter (near beach, coast, lake, etc.) (Ex : Rooftop where there is always sunshine.)

INSTALLATION SPACE

Individual Installation

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

Category	Installation Space	Case 1(10mm≤Side Space≤49mm)	Case 2(Side Space≥49mm)
4 sides are walls		A≥10B≥300C≥10D≥500	A≥50B≥100C≥50D≥500
		A≥10B≥300C≥10D≥500E≥20	A≥50B≥100C≥50D≥500E≥100
		A≥10B≥300C≥10D≥500E≥20F≥600	A≥50B≥100C≥50D≥500E≥100F≥500
		A≥10B≥300C≥10D≥300E≥20F≥500	A≥50B≥100C≥50D≥100E≥100F≥500
		A≥10B≥500C≥10D≥500E≥20F≥900	A≥50B≥500C≥50D≥500E≥100F≥600
Only 2 sides are walls		A≥10B≥300
		A≥200B≥300E≥400
Limitations on the height of the wall (Refer to 4 side walls)		The height of the wall on the front side must be 1500mm or less.The height of the wall on the inlet side must be 500mm or less.There is no limit to the wall on the side.If the height of the walls on the front and the side are higher than the limit, there must be additional space on the front and the side.- Additional Space on the front side by 1/2 of h1.- Additional Space on the inlet side by 1/2 of h2-h1 = A(Actual height) - 1500-h2 = B(Actual height) - 500

Seasonal wind and cautions in winter

• Sufficient measures are required in a snow area or severe cold area in winter so that product can be operated well.
• Get ready for seasonal wind or snow in winter even in other areas.
  • Install a suction and discharge duct not to let in snow or rain.
• Install the outdoor unit not to come in contact with snow directly. If snow piles up and freezes on the air suction hole, the system may malfunction. If it is installed at snowy area, attach the hood to the system.
• Install the outdoor unit at the higher installation console by 50cm than the average snowfall (annual average snowfall) if it is installed at the area with much snowfall.

• Where snow accumulated on the upper part of the Outdoor Unit by more than 10cm, always remove snow for operation.

• The height of H frame must be more than 2 times the snowfall and its width shall not exceed the width of the product. (If width of the frame is wider than that of the product, snow may accumulate)

• Don't install the suction hole and discharge hole of the Outdoor Unit facing the seasonal wind.

LIFTING METHOD

• When carrying the suspended, unit pass the ropes under the unit and use the two suspension points each at the front and rear.
  • Always lift the unit with ropes attached at four points so that impact is not applied to the unit.
• Attach the ropes to the unit at an angle of 40^ or less.

CAUTION

Be very careful while carrying the product.

• Do not have only one person carry product if it is more than 20 kg.
• PP bands are used to pack some products. Do not use them as a mean for transportation because they are dangerous.
• Do not touch heat exchanger fins with your bare hands. Otherwise you may get a cut in your hands.
• Tear plastic packaging bag and scrap it so that children cannot play with it. Otherwise plastic packaging bag may suffocate children to death.
• When carrying in Outdoor Unit, be sure to support it at four points. Carrying in and lifting with 3-point support may make Outdoor Unit unstable, resulting in a fall.
• Use 2 belts of at least 8 ~m long.
• Place extra cloth or boards in the locations where the casing comes in contact with the sling to prevent damage.
• Hoist the unit making sure it is being lifted at its center of gravity.

INSTALLATION

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

For outdoor units should not be supported only by the corner supports.

The location of the Anchor bolts

Unit : mm A B 65 At least 65 At least 65 730 760 65

Chassis Outdoor Unit Capacity A(mm) B(mm)
UX2 10~14	HP 920 792
UX3 16~20	HP 1240 1102

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 of a server rack with labeled components A, B, C, D, E, F and internal structure annotations

100 75 200

75 200

Unit: mm

Ⓐ 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 outdoor unit and ground support for the vibration protection in wide area.
⑭ Space for pipes and wiring (Pipes and wirings for bottom side)
⑤ H-beam support
⑤ Concrete support

WARNING

• Install where it can sufficiently support the weight of the outdoor unit. If the support strength is not enough, the outdoor unit may drop and hurt people.
• Install where the outdoor unit may not fall in strong wind or earthquake. If there is a fault in the supporting conditions, the outdoor 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 outdoor 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 outdoor 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 outdoor unit before welding. Not removing Pallet(Wood Support) causes hazard of fire during welding.

Technical line drawing of a mechanical assembly with mounting base and housing (no text or symbols)

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 outdoor unit.
• Cut the pipes a little longer than measured distance.
• Cut the cable 1.5m longer than the pipe length.

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.

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.

Copper tube 90° Slanted Uneven Rough

Pipe Point down Reamer

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

Smooth all round Inside is shining without scratches. Even length all round = Improper flaring = Inclined Surface damaged 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·cm)	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 wrenches in combination, When connecting the piping, always use a spanner and torque wrench in combination to tighten the flare nut.
- When connecting a flare nut, coat the flare(inner and outer faces) with oil for R410A(PVE) and hand tighten the nut 3 to 4 turns as the initial tightening.

Union

Opening shutoff valve

1 Remove the cap and turn the valve counter clockwise with the hexagon wrench.
2 Turn it until the shaft stops.
Do not apply excessive force to the shutoff valve. Doing so may break the valve body, as the valve is not a backseat type. Always use the special tool.
3 Make sure to tighten the cap securely.

Closing shutoff valve

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

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

3 Make sure to tighten the cap securely.

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

Tightening torque

Shutoff valve size	Tightening torque N·m(Turn clockwise to close)
	Shaft(valve body) Cap		Valve lid) Service port Flare nut		ut	Gas line piping attached to unit
∅6.35	6±0.6	Hexagonal wrench 4mm	29.4±2.9	12.7±2	16±2	-
∅9.52 38±4
∅12.7 9±0.9			53.9±5.8		55±6
∅15.88 15±1.5	Hexagonal wrench 6mm				75±7
∅22.2	30±3	Hexagonal wrench 10mm			-25±3
∅25.4

Insulation of shutoff valve

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

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.

Diagram showing two groups of rod-like objects with a circle and cross symbol, likely illustrating a comparison or comparison scenario.

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 insulation 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 Taping (Should not contain air) Auxiliary valve Nitrogen Note) should not block the outlet side. When the internal pressure in pipe is above the atmospheric pressure, pinhole is o curred and it is a leakage cause.

CAUTION

1 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.

2 Always use a pressure reducing valve.

1. 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 antioxidants, ants nest corrosion occurs. (causes of organic acid alcohol + copper + water + temperature)

REFRIGERANT PIPING INSTALLATION

Precautions on Pipe connection / Valve operation

Pipe connection is done by connecting from the end of the pipe to the branching pipes, and the refrigerant pipe coming out of the outdoor unit is divided at the end to connect to each indoor unit. Flare connection for the indoor unit, and welding connection for the outdoor pipe and the branching parts.

- Use hexagonal wrench to open/close the valve.

Service Port Liquid pipe Gas pipe Refrigerant Charging Port

WARNING

• Always careful not to leak the refrigerant during welding.
- The refrigerant generates poisonous gas harmful to human body if combusted.
- Do not perform welding in a closed space.
- Be sure to close the cap of the service port to prevent gas leakage after the work.

! CAUTION

Please block the pipe knock outs of the front and side panels after installing the pipes. (Animals or foreign objects may be brought in to damage wires.)

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

- Pipe connections can be done on the front side or on the side according to the installation environments.

- Be sure to let 0.2kaf/cm2 Nitrogen flow in the pipe when welding.

- If Nitrogen was not flown during welding, many oxidized membranes may form inside the pipe and disturb the normal operations of valves and condensers.

Left Side Pipe Draw Out Front Pipe Draw Out Right Side Pipe Draw Out

graph LR
    A["Refrigerant Pipe"] --> B["Taping"]
    B --> C["Nitrogen Direction"]
    C --> D["Regulator"]
    D --> E["Valve"]
    E --> F["Nitrogen"]
    style A fill:#f9f,stroke:#333
    style F fill:#bbf,stroke:#333

Preparation Work

- Use Knock Outs of Base Pan of the outdoor unit for Left/Right or Bottom pipe drawing outs.

Technical line drawing of a mechanical assembly with no visible text or symbols

Removal Area for Liquid/Gas pipe bottom side connections.

! CAUTION

• Do not give damage to the pipe/base during the Knock Out work.
• Proceed to pipe work after removing burr after Knock Out work.
• Perform sleeve work to prevent damage to the wire when connecting wires using knock Outs.

Remove leakage prevention cap

• Remove the leakage prevention cap attached to the outdoor unit service valve before pipe work.

• Proceed the leakage prevention cap removal as follows:

• Verify whether the liquid/gas pipes are locked.

• Extract remaining refrigerant or air inside using the service port.
• Remove the leakage prevention cap

Service Port Liquid pipe Gas pipe Leakage Prevention Cap Refrigerant Charging Port

Pipe Drawing Out during Single / Series connection

Method of drawing out pipes on the front side

- Proceed with the pipe work as shown in the below figure for front side pipe drawing out.

Pipe Knock Out for Liquid/Gas pipes

Method of drawing out pipes on the bottom side

- Drawing out common pipe through side panel

Liquid pipe Gas pipe

Remove only liquid/gas pipe Knock out

Refrigerant piping system

Y branch method

1 Outdoor Units

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch (Y branch)
©: Indoor Units

A H 110m L150m (200 m : Conditional application) l 40m (90 m : Conditional application) a b c d e h 40m 2 3 4 5

2 Outdoor Units

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch (Y branch)
©: Indoor Units
(D) : Downward Indoor Unit
⑤ : Connection branch pipe between Outdoor units: ARCNN21

graph TD
    A["Slave Master"] --> B["Slave Master"]
    B --> C["Slave Master"]
    C --> D["Master"]
    E["10m or less"] --> F["h1"]
    F --> G["E"]
    G --> H["H 110m"]
    H --> I["L150m (200 m : Conditional application)"]
    I --> J["/40m (90 m : Conditional application)"]
    J --> K["B"]
    K --> L["a"]
    K --> M["b"]
    K --> N["c"]
    K --> O["d"]
    K --> P["e"]
    K --> Q["f"]
    K --> R["g"]
    K --> S["h 40m"]
    S --> T["c"]
    S --> U["d"]
    S --> V["e"]
    S --> W["f"]
    S --> X["g"]
    style A fill:#f9f,stroke:#333
    style B fill:#f9f,stroke:#333
    style C fill:#f9f,stroke:#333
    style D fill:#f9f,stroke:#333
    style E fill:#f9f,stroke:#333
    style F fill:#f9f,stroke:#333
    style G fill:#f9f,stroke:#333
    style H fill:#f9f,stroke:#333
    style I fill:#f9f,stroke:#333
    style J fill:#f9f,stroke:#333
    style K fill:#f9f,stroke:#333
    style L fill:#f9f,stroke:#333
    style M fill:#f9f,stroke:#333
    style N fill:#f9f,stroke:#333
    style O fill:#f9f,stroke:#333
    style P fill:#f9f,stroke:#333
    style Q fill:#f9f,stroke:#333
    style R fill:#f9f,stroke:#333

Piping length from outdoor branch to outdoor unit ≤10m, equivalent length:max 13m (for 22HP or more)

Conditional Application

To satisfy below condition to make 40 m \~ 90 m of pipe length after first branch.

- Diameter of pipes between first branch and the last branch should be increased by one step, except pipe diameter B,C,D is same as Diameter A ∅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.

- While calculating whole refrigerant pipe length, pipe B,C,D length should be calculated twice.

$$ A + B x 2 + C x 2 + D x 2 + a + b + c + d + e \leq 1, 0 0 0 m $$

• Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 40 m
• [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)]

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

3 Outdoor Units

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch (Y branch)
©: Indoor Units
(D): Downward Indoor Unit
⑤ : Connection branch pipe between Outdoor units: ARCNN31
⑤ : Connection branch pipe between Outdoor units: ARCNN21

4 Outdoor Units

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch (Y branch)
©: Indoor Units
⑭: Downward Indoor Unit
⑤ : Connection branch pipe between Outdoor units: ARCNN41
⑤ : Connection branch pipe between Outdoor units: ARCNN31
© : Connection branch pipe between Outdoor units : ARCNN21

Slave2 Slave1 Master 10m or less h1 F E A H 110m ODU Capacity Master ≥ Slave1 ≥ Slave 2 L150m (200 m : Conditional application) l 40m (90 m : Conditional application) B C D e a D h 40m 2 3 4 C C D C n

Slave3 Slave2 Slave1 Master A 10m or less G F E F H 110m B C D E h 40m ODU Capacity Master ≥ Slave1 ≥ Slave 2 ≥ Slave 3 L150m (200 m : Conditional application) / 40m (90 m : Conditional application) h 40m

Piping length form outdoor branch to outdoor unit ≤ 10 m, equivalent length : max. 13 m(for 22 HP or more)

Conditional Application

To satisfy below condition to make 40 m \~ 90 m of pipe length after first branch.

- Diameter of pipes between first branch and the last branch should be increased by one step, except pipe diameter B,C,D is same as Diameter A 6.359.5212.715.8819.0522.225.4^,28.5831.8^, 34.938.1^*

* : It is not necessary to size up.

- While calculating whole refrigerant pipe length, pipe B,C,D length should be calculated twice.

$$ A + B x 2 + C x 2 + D x 2 + a + b + c + d + e \leq 1, 0 0 0 m $$

• Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 40 m
• [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)] - [Length of pipe outdoor unit to the closest indoor unit 1 (A+a)] ≤ 40 m

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

Downward Indoor Unit total 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)
< 33.6(114,700) ∅9.52(3/8) ∅22.2(7/8)
< 50.4(172,000) ∅12.7(1/2) ∅28.58(1-1/8)
< 67.2(229,400) ∅15.88(5/8) ∅28.58(1-1/8)
< 72.8(248.500) ∅15.88(5/8) ∅34.9(1-3/8)
< 100.8(344,000) ∅19.05(3/4) ∅34.9(1-3/8)
< 173.6(592,500) ∅19.05(3/4) ∅41.3(1-5/8)
< 184.8(630,700) ∅22.2(7/8) ∅44.5(1-3/4)
< 224.0(764,400) ∅22.2(7/8) ∅53.98(2-1/8)

Total pipe length = A+B+C+D+a+b+c+d+e ≤ 1,000 m

L	Longest pipe length Equivalent pipe length
	A+B+C+D+e ≤ 150m(200m**)	*A+B+C+D+e ≤ 175m(225m**)
l	Longest pipe length after 1st branch
	B+C+D+e ≤ 40m(90m**)
H	Difference in height (Outdoor Unit ↔ Indoor Unit)
	H ≤ 110m
h	Difference in height (Indoor Unit ↔ Indoor Unit)
	h ≤ 40m
h1	Difference in height (Outdoor Unit ↔ Outdoor Unit)
	h1 ≤ 5m

• * : Assume equivalent piping length of Y branch to be 0.5m, that of header to be 1m, calculation purpose.
  • ** : To apply Conditional Application

WARNING

When the any one (or both) of below conditions are satisfied, the diameter of main pipe (A) must be increased according to below table.

• The equivalent length between outdoor unit and the farthest indoor unit is 90m or more (Liquid and Gas pipes are increased)
• The level difference (Outdoor unit ↔ Indoor unit) is 50m or more (Only liquid pipe is increased)

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

Upward Outdoor unit total capacity	Standard Pipe Diameter		Increased Pipe Diameter
			When pipe length is 90m or more from ODU to 1st branch		When level difference is 50m or more
HP	Liquid pipe [mm(inch)]	Gas pipe [mm(inch)]	Liquid pipe [mm(inch)]	Gas pipe [mm(inch)]	Liquid pipe [mm(inch)]	Gas pipe [mm(inch)]
8 ∅ 9.52	(3/8) ∅ 19.05(3/4)	∅ 12.7(1/2) ∅ 22.2(7/8) ∅ 12.7(1/2) not increased
10 ∅ 9.52	(3/8) ∅ 22.2(7/8)	∅ 12.7(1/2) ∅ 25.4(1) ∅ 12.7(1/2) not increased
12 ~ 14 ∅ 1	2.7(1/2) ∅ 28.58	(1-1/8) ∅ 15.88(5/8) not increased ∅ 15.88(5/8) not increased
16 ∅ 12.7	(1/2) ∅ 28.58	(1-1/8) ∅ 15.88(5/8) ∅ 31.8(1-1/4) ∅ 15.88(5/8) not increased
18 ~ 22 ∅ 1	5.88(5/8) ∅ 28.58	(1-1/8) ∅ 19.05(3/4) ∅ 31.8(1-1/4) ∅ 19.05(3/4) not increased
24 ∅ 15.88	(5/8) ∅ 34.9(1-3/8) ∅ 19.05(3/4) not increased ∅ 19.05(3/4) not increased
26 ~ 34	∅ 19.05(3/4)	∅ 34.9(1-3/8)	∅ 22.2(7/8)	∅ 38.1(1-1/2)	∅ 22.2(7/8)	not increased
36 ~ 48 ∅ 1	9.05(3/4) ∅ 41	3(1-5/8) ∅ 22.2(7/8) not increased ∅ 22.2(7/8) not increased

* If the step up size is not available, you can not select the next higher size available.

Header Method

1 Outdoor Unit

Example : 6 Indoor Units connected

Ⓐ : Outdoor Unit
⑧: 1st branch
©: Indoor Units
⑭ : Sealed piping

A H 110m L 200m l 40m a b c d e C C C C C 40m 3 4 5 6

2 Outdoor Units

Example : 6 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : Header branch
©: Indoor Units
(D) : Sealing
⑤ : Connection branch pipe between Outdoor units: ARCNN21

Slave Master Slave Master Slave Master 10m or less h1 E A L 200m ODU Capacity Master ≥ Slave 40m 40m 1 2 3 4 5 6

3 Outdoor Units

Example : 6 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : Header branch
©: Indoor Units
⑭ : Sealing
⑤ : Connection branch pipe between Outdoor units: ARCNN31
⑤ : Connection branch pipe between Outdoor units: ARCNN21

Slave2 Slave1 Master h1 10m or less F E A H 110m ODU Capacity Master ≥ Slave1 ≥ Slave2 L 200m 40m B D C G B O t 40m 40m 3 4 6 s

Branch pipe can not be used after header

4 Outdoor Units

Example : 6 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : Header branch
©: Indoor Units
⑭: Sealing
⑤ : Connection branch pipe between Outdoor units: ARCNN41
⑤ : Connection branch pipe between Outdoor units: ARCNN31
⑤ : Connection branch pipe between Outdoor units : ARCNN21

Slave3 Slave2 Slave1 Master 10m or less H 110m ODU Capacity Master ≥ Slave1 ≥ Slave2 ≥ Slave3 L 200m 40m 40m

Branch pipe can not be used after header

Total pipe length = A+a+b+c+d+e+f ≤ 1,000m

L	Longest pipe length *Equivalent pipe length
	A+f ≤ 200m A+f ≤ 225m
l	Longest pipe length after 1st branch
	f ≤ 40m
H	Difference in height (Outdoor Unit ↔ Indoor Unit)
	H ≤ 110m
h	Difference in height (Indoor Unit ↔ Indoor Unit)
	h ≤ 40m
h1	Difference in height (Outdoor Unit ↔ Outdoor Unit)
	h1 ≤ 5m

WARNING

Pipe length after header branching (a\~f)

It is recommended that difference in length of the pipes connected to the Indoor Units is minimized. Performance difference between Indoor Units may occur.

• * : Assume equivalent piping length of Y branch to be 0.5m, that of header to be 1m, calculation purpose
• Indoor Unit should be installed at lower position than the header.
• Piping length from outdoor branch to outdoor unit ≤ 10m, equivalent length : max 13m (for 22HP or more)

Combination of Y branch/header method

1 Outdoor Units

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch (Y branch)
©: Y branch
(D): Indoor Unit
⑤ : Header
⑤ : Sealed piping

L 110m A B C E F 3 4 5 6 7 8 9 10 L 150m(200m : Conditional application) l 40m(90m : Conditional application) h 40m a b c D 1 2 D

Branch pipe can not be used after header

2 Outdoor Units

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch
© : Y branch
(D): Indoor Unit
⑤ : Connection branch pipe between Outdoor units: ARCNN21

⑤ : Header

© : Sealed piping

graph TD
    A["Slave"] --> B["Master"]
    B --> C["Slave"]
    C --> D["Master"]
    D --> E["Slave"]
    E --> F["Master"]
    F --> G["ODU Capacity Master ≥ Slave"]
    H["H 110m"] --> I["10m on less"]
    I --> J["h1"]
    J --> K["E"]
    K --> L["C"]
    L --> M["X"]
    M --> N["e"]
    N --> O["G"]
    P["L 150m(200m : Conditional application)"] --> Q["3"]
    Q --> R["4"]
    R --> S["5"]
    S --> T["6"]
    T --> U["7"]
    U --> V["8"]
    V --> W["9"]
    W --> X["10"]
    X --> Y["11"]
    Y --> Z["12"]
    Z --> AA["13"]
    AA --> AB["14"]
    AB --> AC["15"]
    AC --> AD["16"]
    AD --> AE["17"]
    AE --> AF["18"]
    AF --> AG["19"]
    AG --> AH["20"]
    AH --> AI["21"]
    AI --> AJ["22"]
    AJ --> AK["23"]
    AK --> AL["24"]
    AL --> AM["25"]
    AM --> AN["26"]
    AN --> AO["27"]
    AO --> AP["28"]
    AP --> AQ["29"]
    AQ --> AR["30"]

Branch pipe can not be used after header

3 Outdoor Units

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch(Y branch)
©: Y branch
(D): Indoor Unit
⑤ : Connection branch pipe between Outdoor units: ARCNN31
⑤ : Connection branch pipe between Outdoor units: ARCNN21
G : Header
(H) : Sealing

Slave2 Slave1 Master 10m or less h1 F E F ODU Capacity Master ≥ Slave1 ≥ Slave2 H 110m L 150m(200m : Conditional application) / 40m(90m : Conditional application) h 40m 1 2 3 4 5 6 7 8 9 10

Branch pipe can not be used after header

4 Outdoor Units

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch(Y branch)
©: Y branch
(D): Indoor Unit
⑤ : Connection branch pipe between Outdoor units: ARCNN41
⑤ : Connection branch pipe between Outdoor units: ARCNN31
G : Connection branch pipe between Outdoor units: ARCNN21
(H) : Header
①: Sealing

graph TD
    A["Slave1 Master"] --> B["Slave2 Slave1"]
    B --> C["Slave3 Slave3"]
    D["Master ≥ Slave1 ≥ Slave2 ≥ Slave3"] --> E["ODU Capacity"]
    E --> F["L 150m(200m : Conditional application)"]
    E --> G["40m(90m : Conditional application)"]
    F --> H["150m"]
    G --> I["40m"]
    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:#ffc,stroke:#333
    style F fill:#cff,stroke:#333
    style G fill:#ffc,stroke:#333
    style H fill:#cfc,stroke:#333
    style I fill:#cfc,stroke:#333

Branch pipe can not be used after header

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)]
≤ 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)
< 33.6(114,700) ∅9.52(3/8) ∅22.2(7/8)
< 50.4(172,000) ∅12.7(1/2) ∅28.58(1-1/8)
< 67.2(229,400) ∅15.88(5/8) ∅28.58(1-1/8)
< 72.8(248.500) ∅15.88(5/8) ∅34.9(1-3/8)
< 100.8(344,000) ∅19.05(3/4) ∅34.9(1-3/8)
< 173.6(592,500) ∅19.05(3/4) ∅41.3(1-5/8)
< 184.8(630,700) ∅22.2(7/8) ∅44.5(1-3/4)
< 224.0(764,400) ∅22.2(7/8) ∅53.98(2-1/8)

Total pipe length = A+B+C+a+b+c+d+e ≤ 1,000m

L	Longest pipe length *Equivalent pipe length
	A+B+b ≤ 150m(200m**)	A+B+b ≤ 175m(225m**)
l	Longest pipe length after 1st branch
	B+b ≤ 40m(90m**)
H	Difference in height (Outdoor Unit ↔ Indoor Unit)
	H ≤ 110m
h	Difference in height (Indoor Unit ↔ Indoor Unit)
	h ≤ 40m
h1	Difference in height (Outdoor Unit ↔ Outdoor Unit)
	h1 ≤ 5m

• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, calculation purpose
• ** : To apply Conditional Application
- Indoor Unit should be installed at lower position than the header.

WARNING

• It is recommended that difference of piping length for pipes connected to the Indoor Unit is minimized. Performance difference between Indoor Units may occur.
• When the any one (or both) of below conditions are satisfied, the diameter of main pipe (A) must be increased according to below table.
• The equivalent length between outdoor unit and the farthest indoor unit is 90m or more (Liquid and Gas pipes are increased)
• The level difference (Outdoor unit ↔ Indoor unit) is 50m or more (Only liquid pipe is increased)

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

Upward Outdoor unit total capacity	Standard Pipe Diameter		Increased Pipe Diameter
			When pipe length is 90m or more from ODU to 1st branch		When level difference is 50m or more
HP	Liquid pipe [mm(inch)]	Gas pipe [mm(inch)]	Liquid pipe [mm(inch)]	Gas pipe [mm(inch)]	Liquid pipe [mm(inch)]	Gas pipe [mm(inch)]
8 ∅ 9.52(3/8) ∅ 19.05(3/4) ∅ 12.7(1/2) ∅ 22.2(7/8) ∅ 12.7(1/2) not increased
10 ∅ 9.52(3/8) ∅ 22.2(7/8) ∅ 12.7(1/2) ∅ 25.4(1) ∅ 12.7(1/2) not increased
12 ~ 14 ∅ 12.7(1/2) ∅ 28.58(1-1/8) ∅ 15.88(5/8) not increased ∅ 15.88(5/8) not increased
16 ∅ 12.7(1/2) ∅ 28.58(1-1/8) ∅ 15.88(5/8) ∅ 31.8(1-1/4) ∅ 15.88(5/8) not increased
18 ~ 22	∅ 15.88(5/8)	∅ 28.58(1-1/8)	∅ 19.05(3/4)	∅ 31.8(1-1/4)	∅ 19.05(3/4)	not increased
24	∅ 15.88(5/8)	∅ 34.9(1-3/8) ∅ 19.05(3/4) not increased ∅ 19.05(3/4) not increased
26 ~ 34	∅ 19.05(3/4)	∅ 34.9(1-3/8)	∅ 22.2(7/8)	∅ 38.1(1-1/2)	∅ 22.2(7/8)	not increased
36 ~ 48	∅ 19.05(3/4)	∅ 41.3(1-5/8)	∅ 22.2(7/8)	not increased	∅ 22.2(7/8)	not increased

* If the step up size is not available, you can not select the next higher size available.

Outdoor 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 24HP(67.2 kW) outdoor unit.

1) Outdoor unit main pipe diameter A : ∅34.9(Gas pipe), ∅15.88(liquid pipe)
2) Pipe diameter B after first branch according to 120% indoor unit ombination(80.6kW): ∅34.9(gas pipe), ∅19.05(liquid pipe)
Therefore, pipe diameter B connected after first branch would be ∅34.9(gas pipe) / ∅15.88(liquid pipe) which is same with main pipe diameter.

[Example]

Do not choose the main pipe diameter by downward indoor unit total capacity but its outdoor unit model name.

Do not let the connection pipe from branch to branch exceed the main pipe diameter chosen by outdoor unit model name.

EX) Where connecting the indoor units to the 22 HP (61.6 kW) outdoor unit to 130% of its system capacity (80.1 kW) and branching 7k (2.2kW) indoor unit at the 1st branch.

1) Main pipe diameter(22 HP outdoor unit): ∅28.58(gas pipe), ∅15.88(Liquid pipe)
2) Pipe diameter between 1st and 2nd branch (77.9kW indoor units): ∅34.9(Gas pipe), ∅19.05(Liquid pipe) in conformity with downward indoor units.
Since the main pipe diameter of 22HP outdoor unit is ∅28.58(gas pipe), ∅15.88(Liquid pipe) is used as the main pipe and the connection pipe between 1st and 2nd branch.

Indoor Unit Connection

Indoor Unit connecting pipe from branch (a,b,c,d,e,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)

CAUTION

• Bending radius should be at least twice the diameter of the pipe.
• Bend pipe after 500mm 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 Outdoor units

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

Pipe connection between outdoor units (General Case)

The maximum pipe length after the first branching between the outdoor units is 10m or less

Pipes between outdoor units are 2m or less

2m or less

Pipes between outdoor units are 2m or longer

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

Oil Trap Oil Trap 2m or less 2m or less 2m or longer 2m or longer

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

Examples of Wrong Pipe Connections

graph TD
    A["Main Pipe"] --> B["Outdoor Units"]
    C["Oil Trap"] --> D["Overhead Units"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333

If there are differences in the height between the outdoor units, oil is accumulated in the lower outdoor unit.

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

(Example 1)

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

- When connecting the pipes between the outdoor units, the accumulation of oil in the slave outdoor 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 0.2m 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 : ∅25.4 mm × 0.480(kg/m)
+ Total liquid pipe : ∅22.2 mm × 0.354(kg/m)
+ Total liquid pipe : ∅19.05 mm × 0.266(kg/m)
+ Total liquid pipe : ∅15.88 mm × 0.173(kg/m)
+ Total liquid pipe : ∅12.7 mm × 0.118(kg/m)
+ Total liquid pipe : ∅9.52 mm x 0.061(kg/m)
+ Total liquid pipe : ∅6.35 mm × 0.022(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

$$ \mathrm{CF} = 0. 6 4 \times 1 + 0. 2 6 \times 2 + 0. 2 4 \times 4 = 2. 1 2 \mathrm{kg} $$

Attach the additional refrigerant table of IDU.

CAUTION

Use only 2-series of indoor unit. Ex) ARNU***2

! 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

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

$$ \leq 0. 4 4 \left(\mathrm{kg} / \mathrm{m} ^ {3}\right) $$

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 Outdoor 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

A B C Liquid pipe Gas pipe A Manifold Gauge B Low pressure side Handle C High pressure side Handle

! WARNING

• Pipe to be vacuumed: 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.

Distribution Method

Horizontal Distribution

graph TD
    subgraph Master_Accumulation
        A["Slave Master"] --> B["1st"]
        B --> C["2nd"]
        C --> D["Server Rack 1"]
        C --> E["Server Rack 2"]
        B --> F["Slave Master"]
        F --> G["1st"]
        G --> H["2nd"]
        H --> I["Server Rack 3rd"]
        H --> J["Server Rack 4"]
        G --> K["Slave Master"]
        K --> L["1st Main pipe Distribution"]
        K --> M["2nd Main pipe Distribution"]
        K --> N["3rd Main pipe Distribution"]

graph TD
    A["Slave"] --> B["Master"]
    B --> C["1st"]
    B --> D["2nd"]
    B --> E["3rd"]
    C --> F["3rd main pipe distribution"]
    D --> F
    E --> F
    F --> G["Output 1st"]
    F --> H["Output 2nd"]
    F --> I["Output 3rd"]

Vertical Distribution

- Ensure that the branch pipes are attached vertically.

graph TD
    A["Slave Master"] --> B["Server"]
    B --> C["Base Station 1"]
    B --> D["Base Station 2"]
    B --> E["Base Station 3"]
    B --> F["Base Station 4"]
    B --> G["Base Station 5"]
    B --> H["Base Station 6"]
    B --> I["Base Station 7"]
    B --> J["Base Station 8"]

graph TD
    A["Slave Master"] --> B["Central Node"]
    B --> C["Database 1"]
    B --> D["Database 2"]
    B --> E["Database 3"]
    B --> F["Database 4"]
    B --> G["Database 5"]
    B --> H["Database 6"]
    B --> I["Database 7"]
    B --> J["Database 8"]

The others

graph TD
    A["Slave Master"] --> B["Base Station 1"]
    A --> C["Base Station 2"]
    A --> D["Base Station 3"]
    A --> E["Base Station 4"]
    A --> F["Base Station 5"]
    A --> G["Base Station 6"]
    A --> H["Base Station 7"]
    A --> I["Base Station 8"]
    A --> J["Base Station 9"]
    A --> K["Base Station 10"]

graph TD
    A["Slave Master"] --> B["Server Rack 1"]
    A --> C["Server Rack 2"]
    A --> D["Server Rack 3"]
    A --> E["Server Rack 4"]
    A --> F["Header"]
    B --> G["Server Rack 5"]
    C --> H["Server Rack 6"]
    D --> I["Server Rack 7"]
    E --> J["Server Rack 8"]
    F --> K["Server Rack 9"]

Branch pipe Fitting

Y branch

graph TD
    A["A"] --> B["B"]
    style A fill:#f9f,stroke:#333
    style B fill:#bbf,stroke:#333

Ⓐ To Branch Piping or Indoor Unit
⑧ To Outdoor 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

Technical diagram showing a mechanical assembly with labeled parts A, B, and C, including a close-up of a pipe fitting.

Ⓐ To Outdoor Unit Ⓑ To Indoor Unit

• The indoor unit having larger capacity must be installed closer to Ⓐ than smaller one.
• If the diameter of the refrigerant piping selected by the procedures described is different from the size of the joint, the connecting section should be cut with a pipe cutter.

© 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.

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.

Insulator for cap pipe Cap pipe 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["Close"]
    B --> C["Liquide pipe"]
    B --> D["Gas pipe"]
    E["Slave 1 outdoor unit Master outdoor unit"] --> F["Close"]
    F --> G["Liquide pipe"]
    F --> H["Gas pipe"]
    I["Liquid side"] --> J["Indoor unit"]
    K["Gas side"] --> L["Indoor unit"]

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/cm2 (0.01 MPa) for each 1°C of temperature difference.

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

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

24 hour later: 3.73 MPa, 20°C

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

And hence there is no leakage in pipe occurred.

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 outdoor 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 outdoor unit Master outdoor unit"]
    B --> C["Close"]
    C --> D["Liquid pipe"]
    C --> E["Gas pipe"]
    D --> F["Liquid side"]
    E --> G["Indoor unit"]
    F --> H["Gas side"]
    G --> I["Liquid side"]
    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:#fcc,stroke:#333
    style H fill:#ffc,stroke:#333
    style I fill:#fcc,stroke:#333

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 Outdoor 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

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 :: "Se3" 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"]

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7 DIP SWITCH 7-Segment 8.8:8.8. SW04C ( X : cancel ) SW03C (► : forward ) SW02C (◄ : backward ) SW01C (● : confirm ) SW01D (reset )

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.

B A C

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

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

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 pressurepipe together.Liquid pipeGas pipePower cablesFinishing tapeInsulating materialCommunication cables	Be sure to fully insulate connecting portion.These parts are not insulated.
Good example	Power cables Communication cablesLiquidGas pi|materialPower on cables

Penetrations

Inner wall (concealed)

Outer wall Outer wall (exposed)

Technical diagram of a mechanical assembly with labeled components A, B, C, and D

Floor (fireproofing)

Technical diagram showing labeled components A, B, C, D, E, G in a mechanical or structural assembly.

Roof pipe shaft

Penetrating portion on fire limit and boundary wall

① ② A 1m 1m

Ⓐ Sleeve
⑧ Heat insulating material
© Lagging
© Caulking material
E 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 Outdoor 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 Outdoor Unit.

CAUTION

Be sure to correct the outdoor 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 Outdoor 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.(O 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 Outdoor Unit communication.

graph TD
    A["Outdoor 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"]

graph TD
    A["Outdoor Unit"] --> B["Indoor Unit"]
    B --> C["Remote control"]
    D["Outdoor Unit"] --> E["Indoor Unit"]
    E --> F["Remote control"]
    G["Outdoor Unit"] --> H["Indoor Unit"]
    H --> I["Remote control"]
    J["Outdoor Unit"] --> K["Indoor Unit"]
    K --> L["Remote control"]
    M["Outdoor Unit"] --> N["Indoor Unit"]
    N --> O["Remote control"]

2-Core Shield Cable Multi-Core Cable

graph TD
    subgraph Master Slave1 Slave2
        A1["Master Slave1 Slave2"]
        A2["Master Slave1 Slave2"]
    end
    subgraph Indoor Unit
        B1["Indoor Unit"]
        B2["Indoor Unit"]
        B3["Indoor Unit"]
        B4["Indoor Unit"]
    end
    A1 -->|Remote controller| B1
    A2 -->|Remote controller| B2
    B1 -->|Remote controller| B3
    B2 -->|Remote controller| B4
    B3 -->|Remote controller| B4
    B4 -->|Remote controller| B5["End"]
    style Master Slave1 Slave2 fill:#f9f,stroke:#333
    style Indoor Unit fill:#ccf,stroke:#333

graph TD
    subgraph Master Slave1 Slave2
        A1["Outdoor Unit"] --> B1["Indoor Unit"]
        A2["Master Slave1 Slave2"] --> B2["Indoor Unit"]
        A3["Outdoor Unit"] --> B3["Indoor Unit"]
        A4["Master Slave1 Slave2"] --> B4["Indoor Unit"]
    end
    B1 --> C["Remote controller"]
    B2 --> C
    B3 --> D["Remote controller"]
    B4 --> E["Remote controller"]
    C --> F["Switch"]
    D --> F
    E --> F
    F --> G["Indoor Unit"]
    G --> H["Indoor Unit"]
    H --> I["Indoor Unit"]
    I --> J["Indoor Unit"]

2-Core Shield Cable 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.

Round pressure terminal Power cable

When none are available, follow the instructions below.

• Do not connect wiring of different thicknesses to the power terminal block. (Slack in the power wiring may cause abnormal heat.)
• When connecting 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 connecting position of wiring

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

Isometric illustration of a multi-tiered industrial cooling unit with heat exchangers (no text or symbols)

Front Panel

WARNING

The temperature sensor for outdoor air should not be exposed to direct sunlight. - Provide an appropriate cover to intercept direct sunlight.

UX2 Main PCB Noise Filter External PCB UX3 Take care of the phase sequence of 3-phase 4-wire power system

Communication and Power Cables

Communication cable

• Types : shielding cable
• Cross section : 1.0\~1.5mm ^4
• Maximum allowable temperature: 60°C
• Maximum allowable cable length: under 1000m

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 indicate 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 Outdoor 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.
• Power supply cords of parts of appliances for outdoor use should not be lighter than polychloroprene sheathed flexible cord.
• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from the power supply.

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 outdoor unit

graph TD
    A["Outdoor Power supply (30 4wires)"] --> B["Switch"]
    C["Indoor Power supply (10 2wires)"] --> D["Fuse"]
    B --> E["Power cable (4 Wires Cable)"]
    D --> F["Power cable (2 Wires Cable)"]
    E --> G["Pull Box (Installer option)"]
    F --> H["Pull Box (Installer option)"]
    G --> I["Power cable (2 Wires Cable)"]
    H --> J["Power cable (2 Wires Cable)"]
    I --> K["Communication cable (3 Wires Cable)"]
    J --> L["Communication cable (2 Wires Cable)"]
    K --> M["Power cable (2 Wires Cable)"]
    L --> N["Power cable (2 Wires Cable)"]
    M --> O["Power cable (2 Wires Cable)"]
    N --> P["Power cable (2 Wires Cable)"]
    O --> Q["Power cable (2 Wires Cable)"]
    P --> R["Power cable (2 Wires Cable)"]
    Q --> S["Power cable (2 Wires Cable)"]
    R --> T["Power cable (2 Wires Cable)"]
    S --> U["Power cable (2 Wires Cable)"]
    T --> V["Power cable (2 Wires Cable)"]
    U --> W["Power cable (2 Wires Cable)"]
    V --> X["Power cable (2 Wires Cable)"]
    W --> Y["Power cable (2 Wires Cable)"]
    X --> Z["Power cable (2 Wires Cable)"]
    Y --> AA["Power cable (2 Wires Cable)"]
    Z --> AB["Power cable (2 Wires Cable)"]
    AA --> AC["Power cable (2 Wires Cable)"]
    AB --> AD["Power cable (2 Wires Cable)"]
    AC --> AE["Power cable (2 Wires Cable)"]
    AD --> AF["Power cable (2 Wires Cable)"]
    AE --> AG["Power cable (2 Wires Cable)"]
    AF --> AH["Power cable (2 Wires Cable)"]
    AG --> AI["Power cable (2 Wires Cable)"]
    AH --> AJ["Power cable (2 Wires Cable)"]
    AI --> AK["Power cable (2 Wires Cable)"]
    AJ --> AL["Power cable (2 Wires Cable)"]
    AK --> AM["Power cable (2 Wires Cable)"]
    AL --> AN["Power cable (2 Wires Cable)"]
    AM --> AO["Power cable (2 Wires Cable)"]
    AN --> AP["Power cable (2 Wires Cable)"]
    AO --> AQ["Power cable (2 Wires Cable)"]
    AP --> AR["Power cable (2 Wires Cable)"]
    AQ --> AS["Power cable (2 Wires Cable)"]
    AR --> AT["Power cable (2 Wires Cable)"]
    AS --> AU["Power cable (2 Wires Cable)"]
    AT --> AV["Power cable (2 Wires Cable)"]
    AU --> AW["Power cable (2 Wires Cable)"]
    AV --> AX["Power cable (2 Wires Cable)"]
    AW --> AY["Power cable (2 Wires Cable)"]
    AX --> AZ["Power cable (2 Wires Cable)"]
    AY --> BA["Power cable (2 Wires Cable)"]
    AZ --> BB["Power cable (2 Wires Cable)"]
    BA --> BC["Power cable (2 Wires Cable)"]
    BB --> BD["Power cable (2 Wires Cable)"]
    BC --> BE["Power cable (2 Wires Cable)"]
    BD --> BF["Power cable (2 Wires Cable)"]
    BE --> BG["Power cable (2 Wires Cable)"]
    BF --> BH["Power cable (2 Wires Cable)"]
    BG --> BI["Power cable (2 Wires Cable)"]
    BH --> BJ["Power cable (2 Wires Cable)"]
    BI --> BK["Power cable (2 Wires Cable)"]
    BJ --> BL["Power cable (2 Wires Cable)"]
    BK --> BM["Power cable (2 Wires Cable)"]
    BL --> BN["Power cable (2 Wires Cable)"]
    BM --> BO["Power cable (2 Wires Cable)"]
    BN --> BP["Power cable (2 Wires Cable)"]
    BO --> BQ["Power cable (2 Wires Cable)"]
    BP --> BR["Power cable (2 Wires Cable)"]
    BQ --> BS["Power cable (2 Wires Cable)"]
    BR --> BT["Power cable (2 Wires Cable)"]
    BS --> BU["Power cable (2 Wires Cable)"]
    BT --> BV["Power cable (2 Wires Cable)"]
    BU --> BW["Power cable (2 Wires Cable)"]
    BV --> BX["Power cable (2 Wires Cable)"]
    BW --> BY["Power cable (2 Wires Cable)"]
    BX --> BZ["Power cable (2 Wires Cable)"]
    BY --> CA["Power cable (2 Wires Cable)"]
    CA --> CB["Power cable (2 Wires Cable)"]
    CB --> CC["Power cable (2 Wires Cable)"]
    CC --> CD["Power cable (2 Wires Cable)"]
    CD --> CE["Power cable (2 Wires Cable)"]
    CE --> CF["Power cable (2 Wires Cable)"]
    CF --> CG["Power cable (2 Wires Cable)"]
    CG --> CH["Power cable (2 Wires Cable)"]
    CH --> CI["Power cable (2 Wires Cable)"]
    CI --> CJ["Power cable (2 Wires Cable)"]
    CJ --> CK["Power cable (2 Wires Cable)"]
    CK --> CL["Power cable (2 Wires Cable)"]
    CL --> CM["Power cable (2 Wires Cable)"]
    CM --> CN["Power cable (2 Wires Cable)"]
    CN --> CO["Power cable (2 Wires Cable)"]
    CO --> CP["Power cable (2 Wires Cable)"]
    CP --> CQ["Power cable (2 Wires Cable)"]
    CQ --> CR["Power cable (2 Wires Cable)"]
    CR --> CS["Power cable (2 Wires Cable)"]
    CS --> CT["Power cable (2 Wires Cable)"]
    CT --> CU["Power cable (2 Wires Cable)"]
    CU --> CV["Power cable (2 Wires Cable)"]
    CV --> CW["Power cable (2 Wires Cable)"]
    CW --> CX["Power cable (2 Wires Cable)"]
    CX --> CY["Power cable (2 Wires Cable)"]
    CY --> CZ["Power cable (2 Wires Cable)"]
    CZ --> DA["Power cable (2 Wires Cable)"]
    DA --> DB["Power cable (2 Wires Cable)"]
    DB --> DC["Power cable (2 Wires Cable)"]
    DC --> DD["Power cable (2 Wires Cable)"]
    DD --> DE["Power cable (2 Wires Cable)"]
    DE --> DF["Power cable (2 Wires Cable)"]
    DF --> DG["Power cable (2 Wires Cable)"]
    DG --> DH["Power cable (2 Wires Cable)"]
    DH --> DI["Power cable (2 Wires Cable)"]
    DI --> DJ["Power cable (2 Wires Cable)"]
    DJ --> DK["Power cable (2 Wires Cable)"]
    DK --> DL["Power cable (2 Wires Cable)"]
    DL --> DM["Power cable (2 Wires Cable)"]
    DM --> DU["Power cable (2 Wires Cable)"]
    DU --> DV["Power cable (2 Wires Cable)"]
    DV --> DW["Power cable (2 Wires Cable)"]
    DW --> DX["Power cable (2 Wires Cable)"]
    DX --> DY["Power cable (2 Wires Cable)"]

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 Outdoor unit

SODU B SODU A DU B IDU A INT B INT A Master Outdoor Unit 3 4 3 4 3 4

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

Series outdoor units

When the power source is connected In series between the units.

graph TD
    A["Outdoor Power supply (30 4wires)"] --> B["Switch"]
    B --> C["Fuse"]
    C --> D["Power cable (4 Wires Cable)"]
    D --> E["[Master"]]
    E --> F["[Slave1"]]
    E --> G["[Slave2"]]
    E --> H["[Slave3"]]
    I["Indoor Power supply (10 2wires)"] --> J["Power cable (2 Wires Cable)"]
    J --> K["Pull Box (installer option)"]
    K --> L["Power cable (2 Wires Cable)"]
    L --> M["Pull Box (Installer option)"]
    M --> N["Pull Box (Installer option)"]
    N --> O["Pull Box (Installer option)"]
    O --> P["Pull Box (Installer option)"]
    P --> Q["Pull Box (Installer option)"]
    Q --> R["Pull Box (Installer option)"]
    R --> S["Pull Box (Worker Cable)"]
    S --> T["Communication cable (2 Wires Cable)"]
    T --> U["Power cable (2 Wires Cable)"]
    U --> V["Power cable (2 Wires Cable)"]
    V --> W["Power cable (2 Wires Cable)"]
    W --> X["Power cable (2 Wires Cable)"]
    X --> Y["Power cable (2 Wires Cable)"]
    Y --> Z["Power cable (2 Wires Cable)"]
    Z --> AA["Power cable (2 Wires Cable)"]
    AA --> AB["Power cable (2 Wires Cable)"]
    AB --> AC["Power cable (2 Wires Cable)"]
    AC --> AD["Power cable (2 Wires Cable)"]
    AD --> AE["Power cable (2 Wires Cable)"]
    AE --> AF["Power cable (2 Wires Cable)"]
    AF --> AG["Power cable (2 Wires Cable)"]
    AG --> AH["Power cable (2 Wires Cable)"]
    AH --> AI["Power cable (2 Wires Cable)"]
    AI --> AJ["Power cable (2 Wires Cable)"]
    AJ --> AK["Power cable (2 Wires Cable)"]
    AK --> AL["Power cable (2 Wires Cable)"]
    AL --> AM["Power cable (2 Wires Cable)"]
    AM --> AN["Power cable (2 Wires Cable)"]
    AN --> AO["Power cable (2 Wires Cable)"]
    AO --> AP["Power cable (2 Wires Cable)"]
    AP --> AQ["Power cable (2 Wires Cable)"]
    AQ --> AR["Power cable (2 Wires Cable)"]
    AR --> AS["Power cable (2 Wires Cable)"]
    AS --> AT["Power cable (2 Wires Cable)"]
    AT --> AU["Power cable (2 Wires Cable)"]
    AU --> AV["Power cable (2 Wires Cable)"]
    AV --> AW["Power cable (2 Wires Cable)"]
    AW --> AX["Power cable (2 Wires Cable)"]
    AX --> AY["Power cable (2 Wires Cable)"]
    AY --> AZ["Power cable (2 Wires Cable)"]
    AZ --> BA["Power cable (2 Wires Cable)"]
    BA --> BB["Power cable (2 Wires Cable)"]
    BB --> BC["Power cable (2 Wires Cable)"]
    BC --> BD["Power cable (2 Wires Cable)"]
    BD --> BE["Power cable (2 Wires Cable)"]
    BE --> BF["Power cable (2 Wires Cable)"]
    BF --> BG["Power cable (2 Wires Cable)"]
    BG --> BH["Power cable (2 Wires Cable)"]
    BH --> BI["Power cable (2 Wires Cable)"]
    BI --> BJ["Power cable (2 Wires Cable)"]
    BJ --> BK["Power cable (2 Wires Cable)"]
    BK --> BL["Power cable (2 Wires Cable)"]
    BL --> BM["Power cable (2 Wires Cable)"]
    BM --> BN["Power cable (2 Wires Cable)"]
    BN --> BO["Power cable (2 Wires Cable)"]
    BO --> BP["Power cable (2 Wires Cable)"]
    BP --> BQ["Power cable (2 Wires Cable)"]
    BQ --> BR["Power cable (2 Wires Cable)"]
    BR --> BS["Power cable (2 Wires Cable)"]
    BS --> BT["Power cable (2 Wires Cable)"]
    BT --> BU["Power cable (2 Wires Cable)"]
    BU --> BV["Power cable (2 Wires Cable)"]
    BV --> BW["Power cable (2 Wires Cable)"]
    BW --> BX["Power cable (2 Wires Cable)"]
    BX --> BY["Power cable (2 Wires Cable)"]
    BY --> BZ["Power cable (2 Wires Cable)"]
    BZ --> CA["Power cable (2 Wires Cable)"]
    CA --> CB["Power cable (2 Wires Cable)"]
    CB --> CC["Power cable (2 Wires Cable)"]
    CC --> CD["Power cable (2 Wires Cable)"]
    CD --> CE["Power cable (2 Wires Cable)"]
    CE --> CF["Power cable (2 Wires Cable)"]
    CF --> CG["Power cable (2 Wires Cable)"]
    CG --> CH["Power cable (2 Wires Cable)"]
    CH --> CI["Power cable (2 Wires Cable)"]
    CI --> CJ["Power cable (2 Wires Cable)"]
    CJ --> CK["Power cable (2 Wires Cable)"]
    CK --> CL["Power cable (2 Wires Cable)"]
    CL --> CM["Power cable (2 Wires Cable)"]
    CM --> CN["Power cable (2 Wires Cable)"]
    CN --> CO["Power cable (2 Wires Cable)"]
    CO --> CP["Power cable (2 Wires Cable)"]
    CP --> CQ["Power cable (2 Wires Cable)"]
    CQ --> CR["Power cable (2 Wires Cable)"]
    CR --> CS["Power cable (2 Wires Cable)"]
    CS --> CT["Power cable (2 Wires Cable)"]
    CT --> CU["Power cable (2 Wires Cable)"]
    CU --> CV["Power cable (2 Wires Cable)"]
    CV --> CW["Power cable (2 Wires Cable)"]
    CW --> CX["Power cable (2 Wires Cable)"]
    CX --> CY["Power cable (2 Wires Cable)"]
    CY --> CZ["Power cable (2 Wires Cable)"]
    CZ --> DA["Power cable (2 Wires Cable)"]
    DA --> DB["Power cable (2 Wires Cable)"]
    DB --> DC["Power cable (2 Wires Cable)"]
    DC --> DD["Power cable (2 Wires Cable)"]
    DD --> DE["Power cable (2 Wires Cable)"]
    DE --> DF["Power cable (2 Wires Cable)"]
    DF --> DG["Power cable (2 Wires Cable)"]
    DG --> DH["Power cable (2 Wires Cable)"]
    DH --> DI["Power cable (2 Wires Cable)"]
    DI --> DJ["Power cable (2 Wires Cable)"]
    DJ --> DK["Power cable (2 Wires Cable)"]
    DK --> DL["Power cable (2 Wires Cable)"]
    DL --> DV["Power cable (2 Wires Cable)"]
    DV --> DW["Power cable (2 Wires Cable)"]
    DW --> DX["Power cable (2 Wires Cable)"]
    DX --> DY["Power cable (2 Wires Cable)"]

Frequency	Voltage range(V)
	Outdoor	Indoor
60Hz	380V	220V
50Hz	380~415V	220~240V

WARNING

When the total capacity is over than as follow, the power source do not use in series between the units.

The First terminal block could be burnt out. (68 Hp)

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

graph TD
    A["Outdoor Power supply (30 4wires)"] --> B["Switch"]
    C["Indoor Power supply (10 2wires)"] --> D["Fuse"]
    B --> E["R S T N"]
    D --> F["Fuse"]
    E --> G["R S T N"]
    F --> H["Fuse"]
    G --> I["R S T N"]
    H --> J["Fuse"]
    I --> K["R S T N"]
    J --> L["Fuse"]
    K --> M["Master"]
    L --> N["Master"]
    M --> O["Slave1"]
    N --> P["Slave1"]
    O --> Q["Slave2"]
    P --> R["Slave2"]
    Q --> S["Slave3"]
    R --> T["Slave3"]
    U["Power cable (2 Wires Cable)"] --> V["Pull Box (installer option)"]
    V --> W["Power cable (2 Wires Cable)"]
    V --> X["Pull Box (installer option)"]
    X --> Y["Power cable (2 Wires Cable)"]
    Y --> Z["Pull Box (installer option)"]
    Z --> AA["Power cable (2 Wires Cable)"]
    AA --> AB["Power cable (2 Wires Cable)"]
    AB --> AC["Communication cable (3 Wires Cable)"]
    AC --> AD["Power cable (2 Wires Cable)"]
    AD --> AE["Power cable (2 Wires Cable)"]
    AE --> AF["Power cable (2 Wires Cable)"]
    AF --> AG["Power cable (2 Wires Cable)"]
    AG --> AH["Power cable (2 Wires Cable)"]
    AH --> AI["Power cable (2 Wires Cable)"]
    AI --> AJ["Power cable (2 Wires Cable)"]
    AJ --> AK["Power cable (2 Wires Cable)"]
    AK --> AL["Power cable (2 Wires Cable)"]
    AL --> AM["Power cable (2 Wires Cable)"]
    AM --> AN["Power cable (2 Wires Cable)"]
    AN --> AO["Power cable (2 Wires Cable)"]
    AO --> AP["Power cable (2 Wires Cable)"]
    AP --> AQ["Power cable (2 Wires Cable)"]
    AQ --> AR["Power cable (2 Wires Cable)"]
    AR --> AS["Power cable (2 Wires Cable)"]
    AS --> AT["Power cable (2 Wires Cable)"]
    AT --> AU["Power cable (2 Wires Cable)"]
    AU --> AV["Power cable (2 Wires Cable)"]
    AV --> AW["Power cable (2 Wires Cable)"]
    AW --> AX["Power cable (2 Wires Cable)"]
    AX --> AY["Power cable (2 Wires Cable)"]
    AY --> AZ["Power cable (2 Wires Cable)"]
    AZ --> BA["Power cable (2 Wires Cable)"]
    BA --> BB["Power cable (2 Wires Cable)"]
    BB --> BC["Power cable (2 Wires Cable)"]
    BC --> BD["Power cable (2 Wires Cable)"]
    BD --> BE["Power cable (2 Wires Cable)"]
    BE --> BF["Power cable (2 Wires Cable)"]
    BF --> BG["Power cable (2 Wires Cable)"]
    BG --> BH["Power cable (2 Wires Cable)"]
    BH --> BI["Power cable (2 Wires Cable)"]
    BI --> BJ["Power cable (2 Wires Cable)"]
    BJ --> BK["Power cable (2 Wires Cable)"]
    BK --> BL["Power cable (2 Wires Cable)"]
    BL --> BM["Power cable (2 Wires Cable)"]
    BM --> BN["Power cable (2 Wires Cable)"]
    BN --> BO["Power cable (2 Wires Cable)"]
    BO --> BP["Power cable (2 Wires Cable)"]
    BP --> BQ["Power cable (2 Wires Cable)"]
    BQ --> BR["Power cable (2 Wires Cable)"]
    BR --> BS["Power cable (2 Wires Cable)"]
    BS --> BT["Power cable (2 Wires Cable)"]
    BT --> BU["Power cable (2 Wires Cable)"]
    BU --> BV["Power cable (2 Wires Cable)"]
    BV --> BW["Power cable (2 Wires Cable)"]
    BW --> BX["Power cable (2 Wires Cable)"]
    BX --> BY["Power cable (2 Wires Cable)"]
    BY --> BZ["Power cable (2 Wires Cable)"]
    BZ --> CA["Power cable (2 Wires Cable)"]
    CA --> CB["Power cable (2 Wires Cable)"]
    CB --> CC["Power cable (2 Wires Cable)"]
    CC --> CD["Power cable (2 Wires Cable)"]
    CD --> CE["Power cable (2 Wires Cable)"]
    CE --> CF["Power cable (2 Wires Cable)"]
    CF --> CG["Power cable (2 Wires Cable)"]
    CG --> CH["Power cable (2 Wires Cable)"]
    CH --> CI["Power cable (2 Wires Cable)"]
    CI --> CJ["Power cable (2 Wires Cable)"]
    CJ --> CK["Power cable (2 Wires Cable)"]
    CK --> CL["Power cable (2 Wires Cable)"]
    CL --> CM["Power cable (2 Wires Cable)"]
    CM --> CN["Power cable (2 Wires Cable)"]
    CN --> CO["Power cable (2 Wires Cable)"]
    CO --> CP["Power cable (2 Wires Cable)"]
    CP --> CQ["Power cable (2 Wires Cable)"]
    CQ --> CR["Power cable (2 Wires Cable)"]
    CR --> CS["Power cable (2 Wires Cable)"]
    CS --> CT["Power cable (2 Wires Cable)"]
    CT --> CU["Power cable (2 Wires Cable)"]
    CU --> CV["Power cable (2 Wires Cable)"]
    CV --> CW["Power cable (2 Wires Cable)"]
    CW --> CX["Power cable (2 Wires Cable)"]
    CX --> CY["Power cable (2 Wires Cable)"]
    CY --> CZ["Power cable (2 Wires Cable)"]
    CZ --> DA["Power cable (2 Wires Cable)"]
    DA --> DB["Power cable (2 Wires Cable)"]
    DB --> DC["Power cable (2 Wires Cable)"]
    DC --> DD["Power cable (2 Wires Cable)"]
    DD --> DE["Power cable (2 Wires Cable)"]
    DE --> DF["Power cable (2 Wires Cable)"]
    DF --> DG["Power cable (2 Wires Cable)"]
    DG --> DH["Power cable (2 Wires Cable)"]
    DH --> DI["Power cable (2 Wires Cable)"]
    DI --> DJ["Power cable (2 Wires Cable)"]
    DJ --> DK["Power cable (2 Wires Cable)"]
    DK --> DL["Power cable (2 Wires Cable)"]
    DL --> DM["Power cable (2 Wires Cable)"]
    DM --> DE
    style Frequency fill:#f9f,stroke:#333
    style Voltage range(V) fill:#ccf,stroke:#333
    style Indoor fill:#ccf,stroke:#333
    style 60Hz fill:#cfc,stroke:#333
    style 50Hz fill:#cfc,stroke:#333
    style 60Hz fill:#fcc,stroke:#333
    style 50Hz fill:#fcc,stroke:#333
    style 60Hz fill:#cff,stroke:#333
    style 50Hz fill:#cff,stroke:#333
    style 60Hz fill:#ffc,stroke:#333
    style 50Hz fill:#ffc,stroke:#333
    style 60Hz fill:#ffc,stroke:#333
    style 50Hz fill:#ffc,stroke:#333
    style 60Hz fill:#ffc,stroke:#333
    style 50Hz fill:#ffc,stroke:#333
    style 60Hz fill:#ffc,stroke:#333
    style 50Hz fill:#ffc,stroke:#�33
    style 60Hz fill:#ffc,stroke:#333
    style 50Hz fill:#ffc,stroke:#333
    style 60Hz fill:#ffc,stroke:#333
    style 50Hz fill:#ffc,stroke:#333
    style 60Hz fill:#ffc,stroke:#333
    style 50Hz fill:#ffc,stroke:#333

</details>

<h1 id="warning-19">WARNING</h1>

- 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 Outdoor unit   
![](images/8748ff01a14b1e1066a3999792cacee3b6e213718c35507b4009756e941efe5f.jpg)

<details>
<summary>flowchart</summary>

```mermaid
graph TD
    A["Master Outdoor Unit"] --> B["SODU B"]
    A --> C["SODU A"]
    A --> D["IDU B"]
    A --> E["IDU A"]
    A --> F["INT B"]
    A --> G["INT A"]
    A --> H["⊕"]
    A --> I["⊕"]
    A --> J["⊕"]
    A --> K["⊕"]
    A --> L["⊕"]
    A --> M["⊕"]
    A --> N["⊕"]
    A --> O["⊕"]
    A --> P["⊕"]
    A --> Q["⊕"]
    A --> R["⊕"]
    A --> S["⊕"]
    A --> T["⊕"]
    A --> U["⊕"]
    A --> V["⊕"]
    A --> W["⊕"]
    A --> X["⊕"]
    A --> Y["⊕"]
    A --> Z["⊕"]
    A --> AA["⊕"]
    A --> AB["⊕"]
    A --> AC["⊕"]
    A --> AD["⊕"]
    A --> AE["⊕"]
    A --> AF["⊕"]
    A --> AG["⊕"]
    A --> AH["⊕"]
    A --> AI["⊕"]
    A --> AJ["⊕"]
    A --> AK["⊕"]
    A --> AL["⊕"]
    A --> AM["⊕"]
    A --> AN["⊕"]
    A --> AO["⊕"]
    A --> AP["⊕"]
    A --> AQ["⊕"]
    A --> AR["⊕"]
    A --> AS["⊕"]
    A --> AT["⊕"]
    A --> AU["⊕"]
    A --> AV["⊕"]
    A --> AW["⊕"]
    A --> AX["⊕"]
    A --> AY["⊕"]
    A --> AZ["⊕"]
    A --> BA["⊕"]
    A --> BB["⊕"]
    A --> BC["⊕"]
    A --> BD["⊕"]
    A --> BE["⊕"]
    A --> BF["⊕"]
    A --> BG["⊕"]
    A --> BH["⊕"]
    A --> BI["⊕"]
    A --> BJ["⊕"]
    A --> BK["⊕"]
    A --> BL["⊕"]
    A --> BM["⊕"]
    A --> BN["⊕"]
    A --> BO["⊕"]
    A --> BP["⊕"]
    A --> BQ["⊕"]
    A --> BR["⊕"]
    A --> BS["⊕"]
    A --> BT["⊕"]
    A --> BU["⊕"]
    A --> BV["⊕"]
    A --> BW["⊕"]
    A --> BX["⊕"]
    A --> BY["⊕"]
    A --> BZ["⊕"]

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 outdoor units are matched.(A-A,B-B)

Example) Connection of transmission wire

[BUS type] [STAR type]

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

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

graph TD
    A["Building"] --> B["Branch 1"]
    A --> C["Branch 2"]
    A --> D["Branch 3"]
    A --> E["Branch 4"]
    A --> F["Branch 5"]
    A --> G["Branch 6"]
    A --> H["Branch 7"]
    A --> I["Branch 8"]
    A --> J["Branch 9"]
    A --> K["Branch 10"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#ccf,stroke:#333
    style D fill:#ccf,stroke:#333
    style E fill:#ccf,stroke:#333
    style F fill:#ccf,stroke:#333
    style G fill:#ccf,stroke:#333
    style H fill:#ccf,stroke:#333
    style I fill:#ccf,stroke:#333
    style J fill:#ccf,stroke:#333
    style K fill:#ccf,stroke:#333

graph TD
    A["Power Supply"] --> B["Switch 1"]
    A --> C["Switch 2"]
    A --> D["Switch 3"]
    A --> E["Switch 4"]
    A --> F["Switch 5"]
    A --> G["Switch 6"]
    A --> H["Switch 7"]
    A --> I["Switch 8"]
    A --> J["Switch 9"]
    A --> K["Switch 10"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#ccf,stroke:#333
    style D fill:#ccf,stroke:#333
    style E fill:#ccf,stroke:#333
    style F fill:#ccf,stroke:#333
    style G fill:#ccf,stroke:#333
    style H fill:#ccf,stroke:#333
    style I fill:#ccf,stroke:#333
    style J fill:#ccf,stroke:#333
    style K fill:#ccf,stroke:#333
    style L fill:#ccf,stroke:#333

Example) Connection of power and communication cable (UX2)

Left Side Right Side

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

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

Front Side 1 Front Side 2

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

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

Main Power Connection Communication Connection

Main power terminal block Insulation sleeves attachments Fix firmly not to be displaced

ODU-IDU Communication cable ODU-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.

Example) Connection of power and communication cable (UX3)

Left Side Right Side

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

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

Front Side 1 Front Side 2

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

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

Main Power Connection Communication Connection

Main power terminal block Insulation sleeves attachments Fix firmly not to be displaced

ODU-IDU Communication cable ODU-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 outdoor units

Checking according to dip switch setting

- You can check the setting values of the Master outdoor 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. (For example, represents R410A 30HP)

- Initial display order • Example) A(B)RUN620LTE4

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 LTE4
	2 LTS4

12345678
18 16 14 14 62	2	38	1

- Master Unit • Slave Unit

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

Automatic Addressing

The address of indoor units would be set by Automatic Addressing

• Wait for 3 minutes after supplying power.
  (Master and Slave outdoor units, indoor units)
• Press RED button of the outdoor units for 5 seconds. (SW01C)
• A "88" is indicated on 7-segment LED of the outdoor 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 30 seconds on 7-segment LED of the outdoor 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 SW04C (×: 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.

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
    D -.-> J["Automatic addressing start"]
    G -.-> K["Automatic addressing setting end\nNumbers of indoor unit connection set whose addressing is completed are indicated for 30seconds on 7-segment LED after completing setting"]
    K -.-> L["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."]

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.

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7 DIP-SW01 7 - Segment SW04C (×: 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	Static pressure compensation	Fn2	oFF	op1~op3	selected the option	-	-	change the set value	blank	save in EEPROM
		Night low noise	Fn3	oFF	op1~op12	selected the option	-	-	change the set value	blank	save in EEPROM
		ODU address	Fn5	-		-	0~255	set the value	change the set value	blank	save in EEPROM
		Target pressure adjusting	Fn8	op1~op4		selected the option	-	-	change the set value	blank	save in EEPROM

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

Group Number setting

Group Number setting for Indoor Units

• Confirm the power of whole system(Indoor Unit, Outdoor Unit) is OFF, otherwise turn off.
• The communication cables connected to CEN.A and CEN.B terminal should be connected to central control of Outdoor 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.

Outdoor 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)

Static pressure compensation mode

This function secures the air flow rate of ODU, in case static pressure has been applied like using duct at fan discharge of ODU.

Static pressure compensation mode setting method

graph TD
    A["Master unit PCB DIP switch on : No.5"] --> B["Select the mode using '►', '◄' Button : "Func" Push the '●' button"]
    B --> C["Select the Function using '►', '◄' Button : "Fn2" Push the '●' button"]
    C --> D["Select the Option using '►', '◄' Button : "op1~op3" Push the '●' button"]
    D --> E["Start the Static pressure compensation mode : Save the selected option value in EEPROM"]

FAN Maximum RPM of each step

Capacity UX2 UX3
0~20Pa Standard	730 950
20~40Pa op1	800 1020
40~60Pa op2	820 1050
60~80Pa op3	850 1110

Night Low Noise Function

In cooling mode, this function makes the ODU fan operate at low RPM to reduce the fan noise of ODU at night which has low cooling load.

Night low noise function setting method

graph TD
    A["Master unit PCB DIP switch on : No.5"] --> B["Select the mode using '►', '◄' Button : "Func" Push the '●' button"]
    B --> C["Select the Function using '►', '◄' Button : "Fn3" Push the '●' button"]
    C --> D["Select the Option using '►', '◄' Button : "op1~op12" Push the '●' button"]
    D --> E["Start the Night low noise function : Save the selected option value in EEPROM"]

Time Settings Noise

Step	Judgment Time(Hr)	Operation Time(Hr)
op1 8 9
op2 6.5 10.5
op3 5 12
op4 8 9
op5 6.5 10.5
op6 5 12
op7 8 9
op8 6.5 10
op9 5 12
op10 Continuous operation
op11 Continuous operation
op12 Continuous operation

	Capacity
	UX2 UX3
Step Noise(dB)
op1~op3, op10	55 59
op4~op6, op11	52 56
op7~op9, op12	49 53

CAUTION

• Request installer to set the function during installation.
• If ODU RPM changes, cooling capacity may go down.

Setting the ODU address

mode setting method

graph TD
    A["Master unit PCB DIP switch on : No.5"] --> B["Select the mode using '►', '◄' Button : "Func" Push the '●' button"]
    B --> C["Select the Function using '►', '◄' Button : "Fn5" Push the '●' button"]
    C --> D["Select the Option using '►', '◄' Button : "0" ~ "255" Push the '●' button"]
    D --> E["ODU address is set"]

! CAUTION

• Ask an authorized technician to setting a function.
• If use a function, first install a Central controller.

Target pressure adjusting

mode setting method

graph TD
    A["Master unit PCB DIP switch on : No.5"] --> B["Select the mode using '►', '◄' Button : "Func" Push the '●' button"]
    B --> C["Select the Function using '►', '◄' Button : "Fn8" Push the '●' button"]
    C --> D["Select the Option using '►', '◄' Button : "HEAT", "COOL" Push the '●' button"]
    D --> E["Select the Option using '►', '◄' Button : "op1" ~ "op4" Push the '●' button"]
    E --> F["Target pressure is set"]

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.

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 outdoor 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.

Ex)

21 3 → c2 3 → Repeat Error No. Error No. of Unit Error No. of Compressor

* 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 Air temperature sensor of indoor unit is open or short
	0 2	-		Inlet pipe temperature sensor of indoor unit Inlet pipe temperature sensor of indoor unit is open or short
	0 3	-		Communication error : wired remote controller ↔ indoor unit Failing to receive wired remote controller signal in indoor unit PCB
	0 4	-		Drain pump Malfunction of drain pump
	0 5	-		Communication error : outdoor unit ↔ indoor unit Failing to receive outdoor unit signal in indoor unit PCB
	0 6	-		Outlet pipe temperature sensor of indoor unit Outlet pipe temperature sensor of indoor unit is open or short
	0 9	-		Indoor EEPROM Error In case when the serial number marked on EEPROM of Indoor unit is 0 or FFFFFFF
	1 0	-		Poor fan motor operation Disconnecting the fan motor connector/Failure of indoor fan motor lock
	1 7	-		Inlet Air temperature sensor of FAU Air temperature sensor of indoor unit is open or short
Outdoor unit related error	2	1	1	Master Outdoor Unit Inverter Compressor IPM Fault Master Outdoor Unit Inverter Compressor Drive IPM Fault
			2	Slave1 Outdoor Unit Inverter Compressor IPM Fault Slave1 Outdoor Unit Inverter Compressor Drive IPM Fault
			3	Slave2 Outdoor Unit Inverter Compressor IPM Fault Slave2 Outdoor Unit Inverter Compressor Drive IPM Fault
			4	Slave3 Outdoor Unit Inverter Compressor IPM Fault Slave3 Outdoor Unit Inverter Compressor Drive IPM Fault
	2	2	1	Inverter Board Input Over Current(RMS) of Master Outdoor Unit Master Outdoor Unit Inverter Board Input Current excess (RMS)
			2	Inverter Board Input Over Current(RMS) of Slave1 Outdoor Unit Slave1 Outdoor Unit Inverter Board Input Current excess (RMS)
			3	Inverter Board Input Over Current(RMS) of Slave2 Outdoor Unit Slave2 Outdoor Unit Inverter Board Input Current excess (RMS)
			4	Inverter Board Input Over Current(RMS) of Slave3 Outdoor Unit Slave3 Outdoor Unit Inverter Board Input Current excess (RMS)
Outdoor unit related error	2	3	1	Master Outdoor Unit Inverter Compressor DC link Low VoltageDC charging is not performed at Master Outdoor Unit after starting relay turn on.
			2	Slave1 Outdoor Unit Inverter Compressor DC link Low VoltageDC charging is not performed at Slave1 Outdoor Unit after starting relay turn on.
			3	Slave2 Outdoor Unit Inverter Compressor DC link Low VoltageDC charging is not performed at Slave2 Outdoor Unit after starting relay turn on.
			4	Slave3 Outdoor Unit Inverter Compressor DC link Low VoltageDC charging is not performed at Slave3 Outdoor Unit after starting relay turn on.
	2	4	1	Master Outdoor Unit High Pressure SwitchSystem is turned off by Master Outdoor Unit high pressure switch.
			2	Slave1 Outdoor Unit High Pressure SwitchSystem is turned off by slave1 Outdoor Unit high pressure switch.
			3	Slave2 Outdoor Unit High Pressure SwitchSystem is turned off by slave2 Outdoor Unit high pressure switch.
			4	Slave3 Outdoor Unit High Pressure SwitchSystem is turned off by slave3 Outdoor Unit high pressure switch.
	2	5	1	Master Outdoor Unit Input Voltage High/ Low VoltageMaster Outdoor Unit input voltage is over 487V or below 270V
			2	Slave1 Outdoor Unit Input Voltage High/ Low VoltageSlave1 Outdoor Unit input voltage is over 487V or below 270V
			3	Slave2 Outdoor Unit Input Voltage High/ Low VoltageSlave2 Outdoor Unit input voltage is over 487V or below 270V
			4	Slave3 Outdoor Unit Input Voltage High/ Low VoltageSlave3 Outdoor Unit input voltage is over 487V or below 270V
	2	6	1	Master Outdoor Unit Inverter Compressor Start FailureThe First Start Failure by Master Outdoor Unit Inverter Compressor Abnormality
			2	Slave1 Outdoor Unit Inverter Compressor Start FailureThe First Start Failure by Slave1 Outdoor Unit Inverter Compressor Abnormality
			3	Slave2 Outdoor Unit Inverter Compressor Start FailureThe First Start Failure by Slave2 Outdoor Unit Inverter Compressor Abnormality
			4	Slave3 Outdoor Unit Inverter Compressor Start FailureThe First Start Failure by Slave3 Outdoor Unit Inverter Compressor Abnormality
	2	9	1	Master Outdoor Unit Inverter Compressor Over CurrentMaster Outdoor Unit Inverter Compressor Fault OR Drive Fault
			2	Slave1 Outdoor Unit Inverter Compressor Over CurrentSlave1 Outdoor Unit Inverter Compressor Fault OR Drive Fault
			3	Slave2 Outdoor Unit Inverter Compressor Over CurrentSlave2 Outdoor Unit Inverter Compressor Fault OR Drive Fault
			4	Slave3 Outdoor Unit Inverter Compressor Over CurrentSlave3 Outdoor Unit Inverter Compressor Fault OR Drive Fault
Outdoor unit related error	3	2	1	Master Outdoor Unit Inverter Compressor1 High Discharge Temperature
			2	Slave1 Outdoor Unit Inverter Compressor1 High Discharge Temperature
			3	Slave2 Outdoor Unit Inverter Compressor1 High Discharge Temperature
			4	Slave3 Outdoor Unit Inverter Compressor1 High Discharge Temperature
	3	3	1	Master Outdoor Unit Inverter Compressor2 High Discharge Temperature
			2	Slave1 Outdoor Unit Inverter Compressor2 High Discharge Temperature
			3	Slave2 Outdoor Unit Inverter Compressor2 High Discharge Temperature
			4	Slave3 Outdoor Unit Inverter Compressor2 High Discharge Temperature
	3	4	1	High Pressure of Master Outdoor Unit High Pressure of Master Outdoor Unit
			2	High Pressure of Slave1 Outdoor Unit High Pressure of Slave1 Outdoor Unit
			3	High Pressure of Slave2 Outdoor Unit High Pressure of Slave2 Outdoor Unit
			4	High Pressure of Slave3 Outdoor Unit High Pressure of Slave3 Outdoor Unit
	3	5	1	Low Pressure of Master Outdoor Unit Low Pressure of Master Outdoor Unit
			2	Low Pressure of Slave1 Outdoor Unit Low Pressure of Slave1 Outdoor Unit
			3	Low Pressure of Slave2 Outdoor Unit Low Pressure of Slave2 Outdoor Unit
			4	Low Pressure of Slave3 Outdoor Unit Low Pressure of Slave3 Outdoor Unit
	3	6	1	Master Outdoor Unit Low Compression Ratio Limited
			2	Slave1 Outdoor Unit Low Compression Ratio Limited
			3	Slave2 Outdoor Unit Low Compression Ratio Limited
			4	Slave3 Outdoor Unit Low Compression Ratio Limited
Outdoor unit related error	4	0	1	Master Outdoor Unit Inverter Compressor CT Sensor Fault
			2	Slave1 Outdoor Unit Inverter Compressor CT Sensor Fault
			3	Slave2 Outdoor Unit Inverter Compressor CT Sensor Fault
			4	Slave3 Outdoor Unit Inverter Compressor CT Sensor Fault
	4	1	1	Master Outdoor Unit Inverter Compressor1 Discharge Temperature Sensor Fault
			2	Slave1 Outdoor Unit Inverter Compressor1 Discharge Temperature Sensor Fault
			3	Slave2 Outdoor Unit Inverter Compressor1 Discharge Temperature Sensor Fault
			4	Slave3 Outdoor Unit Inverter Compressor1 Discharge Temperature Sensor Fault
	4	2	1	Master Outdoor Unit Low Pressure Sensor Fault
			2	Slave1 Outdoor Unit Low Pressure Sensor Fault
			3	Slave2 Outdoor Unit Low Pressure Sensor Fault
			4	Slave3 Outdoor Unit Low Pressure Sensor Fault
	4	3	1	Master Outdoor Unit High Pressure Sensor Fault
			2	Slave1 Outdoor Unit High Pressure Sensor Fault
			3	Slave2 Outdoor Unit High Pressure Sensor Fault
			4	Slave3 Outdoor Unit High Pressure Sensor Fault
	4	4	1	Master Outdoor Unit Air Temperature Sensor Fault
			2	Slave1 Outdoor Unit Air Temperature Sensor Fault
			3	Slave2 Outdoor Unit Air Temperature Sensor Fault
			4	Slave3 Outdoor Unit Air Temperature Sensor Fault
Outdoor unit related error	4	5	1	Master Outdoor Unit Heat Exchanger Temperature Sensor (Front side) Fault
			2	Slave1 Outdoor Unit Heat Exchanger Temperature Sensor (Front side) Fault
			3	Slave2 Outdoor Unit Heat Exchanger Temperature Sensor (Front side) Fault
			4	Slave3 Outdoor Unit Heat Exchanger Temperature Sensor (Front side) Fault
	4	6	1	Master Outdoor Unit Suction Temperature Sensor Fault
			2	Slave1 Outdoor Unit Suction Temperature Sensor Fault
			3	Slave2 Outdoor Unit Suction Temperature Sensor Fault
			4	Slave3 Outdoor Unit Suction Temperature Sensor Fault
	4	7	1	Master Outdoor Unit Inverter Compressor2 Discharge Temperature Sensor Fault
			2	Slave1 Outdoor Unit Inverter Compressor2 Discharge Temperature Sensor Fault
			3	Slave2 Outdoor Unit Inverter Compressor2 Discharge Temperature Sensor Fault
			4	Slave3 Outdoor Unit Inverter Compressor2 Discharge Temperature Sensor Fault
	4	9	1	Master Outdoor Unit Faulty IPM Temperature Sensor
			2	Slave1 Outdoor Unit Faulty IPM Temperature Sensor
			3	Slave2 Outdoor Unit Faulty IPM Temperature Sensor
			4	Slave3 Outdoor Unit Faulty IPM Temperature Sensor
	5	0	1	Omitting connection of R, S, T power of Master Outdoor Unit
			2	Omitting connection of R, S, T power of Slave1 Outdoor Unit
			3	Omitting connection of R, S, T power of Slave2 Outdoor Unit
			4	Omitting connection of R, S, T power of Slave3 Outdoor Unit
Outdoor unit related error	5	1	1	Excessive capacity of indoor units
	5	2	1	Communication error : inverter PCB → Main PCB
			2	Communication error : inverter PCB → Main PCB
			3	Communication error : inverter PCB → Main PCB
			4	Communication error : inverter PCB → Main PCB
	5	3	1	Communication error : indoor unit → Main PCB of Outdoor Unit
	5	7	1	Communication error : Main PCB → inverter PCB
			2	Communication error : Main PCB → inverter PCB
			3	Communication error : Main PCB → inverter PCB
			4	Communication error : Main PCB → inverter PCB
	5	9	1	Mixing Installation of Sub Outdoor Unit
	6	0	1	Inverter PCB EEPROM Error of Master Outdoor Unit
			2	Inverter PCB EEPROM Error of Slave1 Unit
			3	Inverter PCB EEPROM Error of Slave2 Unit
			4	Inverter PCB EEPROM Error of Slave3 Unit
	6	2	1	Master Outdoor Unit Inverter Heatsink High Temperature
			2	Slave1 Outdoor Unit Inverter Heatsink High Temperature
			3	Slave2 Outdoor Unit Inverter Heatsink High Temperature
			4	Slave3 Outdoor Unit Inverter Heatsink High Temperature
Outdoor unit related error	6	5	1	Master Outdoor Unit Inverter Heatsink Temperature Sensor Fault
			2	Slave1 Outdoor Unit Inverter Heatsink Temperature Sensor Fault
			3	Slave2 Outdoor Unit Inverter Heatsink Temperature Sensor Fault
			4	Slave3 Outdoor Unit Inverter Heatsink Temperature Sensor Fault
	6	7	1	Master Outdoor Unit Fan Lock Restriction of Master Outdoor Unit
			2	Slave1 Outdoor Unit Fan Lock Restriction of Slave1 Outdoor Unit
			3	Slave2 Outdoor Unit Fan Lock Restriction of Slave2 Outdoor Unit
			4	Slave3 Outdoor Unit Fan Lock Restriction of Slave3 Outdoor Unit
	7	1	1	Converter CT Sensor Error of Master Outdoor Unit
			2	Converter CT Sensor Error of Slave1 Outdoor Unit
			3	Converter CT Sensor Error of Slave2 Outdoor Unit
			4	Converter CT Sensor Error of Slave2 Outdoor Unit
	7	5	1	Master Outdoor Unit Fan CT Sensor Error
			2	Slave1 Outdoor Unit Fan CT Sensor Error
			3	Slave2 Outdoor Unit Fan CT Sensor Error
			4	Slave3 Outdoor Unit Fan CT Sensor Error
	7	6	1	Master Outdoor Unit Fan DC Link High Voltage Error
			2	Slave1 Outdoor Unit Fan DC Link High Voltage Error
			3	Slave2 Outdoor Unit Fan DC Link High Voltage Error
			4	Slave3 Outdoor Unit Fan DC Link High Voltage Error
Outdoor unit related error	7	7	1	Master Outdoor Unit Fan Over Current Error
			2	Slave1 Outdoor Unit Fan Over Current Error
			3	Slave2 Outdoor Unit Fan Over Current Error
			4	Slave3 Outdoor Unit Fan Over Current Error
	7	9	1	Master Outdoor Unit Fan Start Failure Error
			2	Slave1 Outdoor Unit Fan Start Failure Error
			3	Slave2 Outdoor Unit Fan Start Failure Error
			4	Slave3 Outdoor Unit Fan Start Failure Error
	8	6	1	Master Outdoor Unit Main PCB EEPROM Error
			2	Slave1 Outdoor Unit Main PCB EEPROM Error
			3	Slave2 Outdoor Unit Main PCB EEPROM Error
			4	Slave3 Outdoor Unit Main PCB EEPROM Error
	8	7	1	Master Outdoor Unit Fan PCB EEPROM Error
			2	Slave1 Outdoor Unit Fan PCB EEPROM Error
			3	Slave2 Outdoor Unit Fan PCB EEPROM Error
			4	Slave3 Outdoor Unit Fan PCB EEPROM Error

Display Title					Cause of Error
Outdoor unit related error	104			1	Communication Error Between Master Outdoor Unit and Other Outdoor Unit	Failing to receive Slave Unit signal at main PCB of Master Outdoor Unit
				2	Communication Error Between Slave1 Outdoor Unit and Other Outdoor Unit	Failing to receive Master and other Slave Unit signal at main PCB of Slave1 Outdoor Unit
				3	Communication Error Between Slave2 Outdoor Unit and Other Outdoor Unit	Failing to receive Master and other Slave Unit signal at main PCB of Slave2 Outdoor Unit
				4	Communication Error Between Slave3 Outdoor Unit and Other Outdoor Unit	Failing to receive Master and other Slave Unit signal at main PCB of Slave2 Outdoor Unit
	105			1	Master Outdoor Unit Fan PCB Communication Error	Failing to receive fan signal at main PCB of Master unit.
				2	Slave1 Outdoor Unit Fan PCB Communication Error	Failing to receive fan signal at main PCB of Slave1 unit.
				3	Slave2 Outdoor Unit Fan PCB Communication Error	Failing to receive fan signal at main PCB of Slave2 unit.
				4	Slave3 Outdoor Unit Fan PCB Communication Error	Failing to receive fan signal at main PCB of Slave3 unit.
	106			1	Master Outdoor Unit FAN IPM Fault Error	Instant Over Current at Master Outdoor Unit Fan IPM
				2	Slave1 Outdoor Unit FAN IPM Fault Error	Instant Over Current at Slave1 Outdoor Unit Fan IPM
				3	Slave2 Outdoor Unit FAN IPM Fault Error	Instant Over Current at Slave2 Outdoor Unit Fan IPM
				4	Slave3 Outdoor Unit FAN IPM Fault Error	Instant Over Current at Slave3 Outdoor Unit Fan IPM
	107			1	Master Outdoor Unit Fan DC Link Low Voltage Error	Master Outdoor Unit Fan DC Link Input Voltage is under 380V
				2	Slave1 Outdoor Unit Fan DC Link Low Voltage Error	Slave1 Outdoor Unit Fan DC Link Input Voltage is under 380V
				3	Slave2 Outdoor Unit Fan DC Link Low Voltage Error	Slave2 Outdoor Unit Fan DC Link Input Voltage is under 380V
				4	Slave3 Outdoor Unit Fan DC Link Low Voltage Error	Slave3 Outdoor Unit Fan DC Link Input Voltage is under 380V
	113			1	Master Outdoor Unit Liquid pipe Temperature Sensor Error	Liquid pipe temperature sensor of Master Outdoor Unit is open or short
				2	Slave1 Outdoor Unit Liquid pipe Temperature Sensor Error	Liquid pipe temperature sensor of slave1 Outdoor Unit is open or short
				3	Slave2 Outdoor Unit Liquid pipe Temperature Sensor Error	Liquid pipe temperature sensor of slave2 Outdoor Unit is open or short
				4	Slave3 Outdoor Unit Liquid pipe Temperature Sensor Error	Liquid pipe temperature sensor of slave3 Outdoor Unit is open or short
Outdoor unit related error	1	1	4		1	Master Outdoor Unit Subcooling Inlet Temperature Sensor Error
					2	Slave1 Outdoor Unit Subcooling Inlet Temperature Sensor Error
					3	Slave2 Outdoor Unit Subcooling Inlet Temperature Sensor Error
					4	Slave3 Outdoor Unit Subcooling Inlet Temperature Sensor Error
	1	1	5		1	Master Outdoor Unit Subcooling Outlet Temperature Sensor Error
					2	Slave1 Outdoor Unit Subcooling Outlet Temperature Sensor Error
					3	Slave2 Outdoor Unit Subcooling Outlet Temperature Sensor Error
					4	Slave3 Outdoor Unit Subcooling Outlet Temperature Sensor Error
	1	1	6		1	Master Outdoor Unit Oil Level Sensor Error
					2	Slave1 Outdoor Unit Oil Level Sensor Error
					3	Slave2 Outdoor Unit Oil Level Sensor Error
					4	Slave3 Outdoor Unit Oil Level Sensor Error
	1	4	5		1	Master outdoor unit Main Board - External Board communication Error
					2	Slave1 outdoor unit Main Board - External Board communication Error
					3	Slave2 outdoor unit Main Board - External Board communication Error
					4	Slave3 outdoor unit Main Board - External Board communication Error
	1	5	1		1	Failure of operation mode conversion at Master Outdoor Unit
					2	Failure of operation mode conversion at Slave1 Outdoor Unit
					3	Failure of operation mode conversion at Slave2 Outdoor Unit
					4	Failure of operation mode conversion at Slave3 Outdoor Unit
Outdoor unit related error	15	3		1	Master Outdoor Unit Heat Exchanger Temperature Sensor (upper part) Fault	Master Outdoor Unit Heat Exchanger Temperature Sensor (upper part) Fault
				2	Slave1 Outdoor Unit Heat Exchanger Temperature Sensor (upper part) Fault	Slave1 Outdoor Unit Heat Exchanger Temperature Sensor (upper part) Fault
				3	Slave2 Outdoor Unit Heat Exchanger Temperature Sensor (upper part) Fault	Slave2 Outdoor Unit Heat Exchanger Temperature Sensor (upper part) Fault
				4	Slave3 Outdoor Unit Heat Exchanger Temperature Sensor (upper part) Fault	Slave3 Outdoor Unit Heat Exchanger Temperature Sensor (upper part) Fault
	15	4		1	Master Outdoor Unit Heat Exchanger Temperature Sensor (lower part) Fault	Master Outdoor Unit Heat Exchanger Temperature Sensor(lower part) open or short
				2	Slave1 Outdoor Unit Heat Exchanger Temperature Sensor (lower part) Fault	Slave1 Outdoor Unit Heat Exchanger Temperature Sensor (lower part) open or short
				3	Slave2 Outdoor Unit Heat Exchanger Temperature Sensor (lower part) Fault	Slave2 Outdoor Unit Heat Exchanger Temperature Sensor(lower part) open or short
				4	Slave3 Outdoor Unit Heat Exchanger Temperature Sensor (lower part) Fault	Slave3 Outdoor Unit Heat Exchanger Temperature Sensor(lower part) open or short
	18	2		1	Master outdoor unit External Board Main-Sub Micom communication Error	Master Outdoor Unit Main Board Main-Sub Micom communication failed
				2	Slave1 outdoor unit External Board Main-Sub Micom communication Error	Slave1 Outdoor Unit Main Board Main-Sub Micom communication failed
				3	Slave2 outdoor unit External Board Main-Sub Micom communication Error	Slave2 Outdoor Unit Main Board Main-Sub Micom communication failed
				4	Slave3 outdoor unit External Board Main-Sub Micom communication Error	Slave3 Outdoor Unit Main Board Main-Sub Micom communication failed
	19	3		1	Master Outdoor Unit Fan Heatsink High Temperature	System is turned off by Master Outdoor Unit Fan Heatsink High Temperature
				2	Slave1 Outdoor Unit Fan Heatsink High Temperature	System is turned off by Slave1 Outdoor Unit Fan Heatsink High Temperature
				3	Slave2 Outdoor Unit Fan Heatsink High Temperature	System is turned off by Slave2 Outdoor Unit Fan Heatsink High Temperature
				4	Slave3 Outdoor Unit Fan Heatsink High Temperature	System is turned off by Slave3 Outdoor Unit Fan Heatsink High Temperature
	19	4		1	Master Outdoor Unit Fan Heatsink Temperature Sensor Fault	Master Outdoor Unit Fan Heatsink Temperature Sensor open or short
				2	Slave1 Outdoor Unit Fan Heatsink Temperature Sensor Fault	Slave1 Outdoor Unit Fan Heatsink Temperature Sensor open or short
				3	Slave2 Outdoor Unit Fan Heatsink Temperature Sensor Fault	Slave2 Outdoor Unit Fan Heatsink Temperature Sensor open or short
				4	Slave3 Outdoor Unit Fan Heatsink Temperature Sensor Fault	Slave3 Outdoor Unit Fan Heatsink Temperature Sensor open or short

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/m3 (Freon gas weight per unit air volume) for facilitating calculation.

Limiting concentration: 0.44kg/m3(R410A)

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

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 outdoor + unit system | Amount of replenished refrigerant at factory shipment Amount of additional replenished refrigerant = 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

Outdoor unit Indoor unit

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

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

graph TD
    A["Outdoor unit"] --> B["Indoor unit"]
    B --> C["Smallest room"]
    C --> D["Indoor unit"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333

Calculate refrigerant concentration

Total amount of replenished refrigerant in refrigerant facility (kg) Capacity of smallest room where indoor unit is installed (m³) = Refrigerant concentration I (kg/m³) (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 outdoor refrigerant qty.

graph TD
    A["Countermeasure 2"] --> B["Indoor unit"]
    B --> C["Opening effective to ventilation"]
    D["Gas leak alarm"] --> B
    E["Mechanical ventilator"] --> B
    F["Countermeasure 1"] --> B

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

INSTALLATION GUIDE AT THE SEASIDE

! CAUTION

• Air conditioners should not be installed in areas where corrosive gases, such as acid or alkaline gas, are produced.
- Do not install the product where it could be exposed to sea wind (salty wind) directly. It can result corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or inefficient performance.
- If outdoor unit is installed close to the seaside, it should avoid direct exposure to the sea wind. Otherwise it needs additional anticorrosion treatment on the heat exchanger.

Selecting the location(Outdoor Unit)

If the outdoor unit is to be installed close to the seaside, direct exposure to the sea wind should be avoided. Install the outdoor unit on the opposite side of the sea wind direction.

Sea wind ↓ Sea wind

In case, to install the outdoor unit on the sea-side, set up a windbreak not to be exposed to the sea wind.

Windbreak Sea wind

• It should be strong enough like concrete to prevent the sea wind from the sea.
• The height and width should be more than 150% of the outdoor unit.
• It should be keep more than 70 cm of space between outdoor unit and the windbreak for easy air flow.

Select a well-drained place.

- Periodic (more than once/year) cleaning of the dust or salt particles stuck on the heat exchanger by using water

LG

Life's Good