ARUN80LM3 - Water pump LG - Free user manual and instructions

USER MANUAL ARUN80LM3 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™ Solo - Heat Pump

MODELS : ARUN***LM3 Series

TABLE OF CONTENTS

Safety Precautions....3

Installation Process ....7

Outdoor units Information......8

Environment-friendly Alternative Refrigerant R410A 9

Select the Best Location 9

Installation Space....10

Lifting method ....12

Installation ....13

Refrigerant piping installation ....18

Pipe connections between indoor and outdoor unit....21

Electrical Wiring 36

Test Run 52

New Function 69

Caution For Refrigerant Leak....78

Installation guide at the seaside....80

Safety Precautions

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

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications.

WARNING

This symbol indicates the possibility of death or serious injury.

CAUTION

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

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

Be sure not to do.

Be sure to follow the instruction.

WARNING

■ 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.

Always ground the product.

- There is risk of 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 store or use flammable gas or combustibles near the air conditioner.

- There is risk of fire or failure of product.

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.

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 install a dedicated circuit and breaker.

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

Do not install, remove, or re-install the unit by yourself (customer).

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

Use the correctly rated breaker or fuse.

- There is risk of fire or electric shock.

Do not install the product on a defective installation stand.

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

When installing and moving the air conditioner to another site, do not charge it with a different refrigerant from the refrigerant specified on the unit.

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

Ventilate before operating air conditioner when gas leaked out.

- It may cause explosion, fire, and burn.

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.

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.

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.

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.

Operation

Do not damage or use an unspecified power cord.

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

Be cautious that water could not enter the product.

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

When the product is soaked (flooded or submerged), contact an Authorized Service Center.

- There is risk of fire or electric shock.

Take care to ensure that nobody could step on or fall onto the outdoor unit.

- This could result in personal injury and product damage.

Use a dedicated outlet for this appliance.

- There is risk of fire or electrical shock.

Do not touch the power switch with wet hands.

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

Be cautious not to touch the sharp edges when installing.

- It may cause injury.

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.

Keep level even when installing the product.

• To avoid vibration or water leakage.

Use power cables of sufficient current carrying capacity and rating.

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

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.

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.

Do not install the unit where combustible gas may leak.

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

Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air conditioner, not a precision refrigeration system.

• There is risk of damage or loss of property.

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

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

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.

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.

Do not block the inlet or outlet.

- It may cause failure of appliance or accident.

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.

Installation Process

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

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

    Q --> X["Outdoor unit foundation work"]
    R --> X
    X --> Y["Installation of outdoor unit"]
    Y --> Z["The foundation must be level even"]
    Y --> AA["Avoid short circuits and ensure sufficient space is allowed for service"]

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

Outdoor units Information

Power Supply: Outdoor Unit (30, 380 - 415V, 50Hz / 30, 380V, 60Hz)

Unit		1 Outdoor unit
System(HP)		8	10	12
Model		ARUN80LM3	ARUN100LM3	ARUN120LM3
		ARUN80LM3	ARUN100LM3	ARUN120LM3
Product Charge	kg	5.0	5.5	5.5
Max. Connectable No. of Indoor Units		13	16	20
Net Weight	kg	175 x 1	218 x 1	218 x 1
	Ibs	385 x 1	480 x 1	480 x 1
Dimensions (WxHxD)	mm	(920 x 1,680 x 760) x 1	(920 x 1,680 x 760) x 1	(920 x 1,680 x 760) x 1
	inch	(36.2 x 66.1 x 29.9) x 1	(36.2 x 66.1 x 29.9) x 1	(36.2 x 66.1 x 29.9) x 1
Connecting Pipes	Liquid Pipes[mm(inch)]	9.52(3/8)	9.52(3/8)	12.7(1/2)
	Gas Pipes[mm(inch)]	19.05(3/4)	22.2(7/8)	28.58(1 1/8)

CAUTION

■ Combination ratio of indoor units : 50 \~ 130%

1. We can guarantee the operation only within 100% combination. If you want to connect more than 100% combination, please contact us and discuss.
2. If the operation of indoor unit is more than 100%, the airflow is operated as low in the all indoor units.

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

1. 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 the Best Location

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
Only 2 sides are walls	No limit to the height of the wall		A≥10B≥300
	No limit to the height of the wall		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 inlet side by 1/2 of h1.- Additional Space on the front side by 1/2 of h2- h_2 = A(Actual height) - 1500- h_1 = 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.

Locking points for transportation ropes

Weight per Capacity

Chassis	Capacity(HP) Weight(kg)
UX2	8 175
	10 218
	12 218

Forklift Carrying Hole

Technical diagram showing a device with fan and labeled component, including an inset close-up of the component.

Forklift Carrying Guide

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.

Technical line drawing of a server rack unit with no visible text or symbols

At least 100mm At least 100mm

For outdoor units of 23kW or above should not be supported only by the corner supports.

Technical line drawing of a mechanical enclosure with internal components and a circular inset (no text or symbols)

At least 100mm At least 100mm

The location of the Anchor bolts

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

Chassis	Capacity(HP)	A (mm) B (mm)
UX2 8~12 920	792

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 device mounting base with labeled components E, F, C, and D

Unit : mm 100 75 200 75 200

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

WARNING

• 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.

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.

1) Cut the pipes and the cable.

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

2) Burrs removal

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

3) Flaring work

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

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.

Copper tube 90 Slanted Uneven Rough

Pipe Point down Reamer

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

4) Check

• Compare the flared work with figure below.
- If flare is noted to be defective, cut off the flared section and do flaring work again.

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(Ncm)	A(mm)	flare shape
∅9.5	3270-3990	12.8-13.2
∅12.7	4950-6030	16.2-16.6
∅15.9	6180-7540	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		Gas line piping attached to unit
∅6.4	5.4-6.6	Hexagonal wrench 4mm	13.5-16.5	11.5-13.9	14-17	-
∅9.5					33-39
∅12.7	8.1-9.9		18-22		50-60
∅15.9	13.5-16.5	Hexagonal wrench 6mm	23-27		62-75

HEAT INSULATION

1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120^ C).
2. Precautions in high humidity circumstance:

This air conditioner has been tested according to the "ISO Conditions with Mist" and confirmed that there is not any default. However, if it is operated for a long time in high humid atmosphere (dew point temperature: more than 23°C), water drops are liable to fall. In this case, add heat insulation material according to the following procedure:

• Heat insulation material to be prepared... EPDM (Ethylene Propylene Diene Methylene)-over 120^ the heat-resistance temperature.
• Add the insulation over 10mm thickness at high humidity environment.

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

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.

Gas pipe Liquid pipe

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 the cables.)

Caution

1. Use the following materials for refrigerant piping.

2. Material: Seamless phosphorous deoxidized copper pipe

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

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

Outer diameter (mm)	6.35 9.5	2 12.7 15.88	19.05 22.2	25.4 28.58
Minimum Thickness (mm)	0.8 0.8	0.8 0.99 0.99	0.99 0.99 0.99

1. Commercially available piping often contains dust and other materials. Always blow it clean with a dry inert gas.
2. Use care to prevent dust, water or other contaminants from entering the piping during installation.
3. Reduce the number of bending portions as much as possible, and make bending radius as big as possible.
4. Always use the branch piping set shown below, which are sold separately.

Y branch	Header
	4 branch	7 branch	10 branch
ARBLN01621, ARBLN03321, ARBLN07121, ARBLN14521, ARBLN23220	ARBL054	ARBL057	ARBL1010
	ARBL104	ARBL107	ARBL2010

1. If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut the connecting section and then use an adapter for connecting different diameters to connect the piping.
2. Always observe the restrictions on the refrigerant piping (such as rated length, difference in height, and piping diameter).

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

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

graph TD
    subgraph LeftPanel
        A1[" "] --> B1[" "]
        A2[" "] --> B2[" "]
        A3[" "] --> B3[" "]
        A4[" "] --> B4[" "]
        A5[" "] --> B5[" "]
        A6[" "] --> B6[" "]
        A7[" "] --> B7[" "]
        A8[" "] --> B8[" "]
        A9[" "] --> B9[" "]
        A10[" "] --> B10[" "]
        A11[" "] --> B11[" "]
        A12[" "] --> B12[" "]
        A13[" "] --> B13[" "]
        A14[" "] --> B14[" "]
        A15[" "] --> B15[" "]
        A16[" "] --> B16[" "]
        A17[" "] --> B17[" "]
        A18[" "] --> B18[" "]
        A19[" "] --> B19[" "]
        A20[" "] --> B20[" "]
        A21[" "] --> B21[" "]
        A22[" "] --> B22[" "]
        A23[" "] --> B23[" "]
        A24[" "] --> B24[" "]
        A25[" "] --> B25[" "]
        A26[" "] --> B26[" "]
        A27[" "] --> B27[" "]
        A28[" "] --> B28[" "]
        A29[" "] --> B29[" "]
        A30[" "] --> B30[" "]
        A31[" "] --> B31[" "]
        A32[" "] --> B32[" "]
        A33[" "] --> B33[" "]
        A34[" "] --> B34[" "]
        A35[" "] --> B35[" "]
        A36[" "] --> B36[" "]
        A37[" "] --> B37[" "]
        A38[" "] --> B38[" "]
        A39[" "] --> B39[" "]
        A40[" "] --> B40[" "]
        A41[" "] --> B41[" "]
        A42[" "] --> B42[" "]
        A43[" "] --> B43[" "]
        A44[" "] --> B44[" "]
        A45[" "] --> B45[" "]
        A46[" "] --> B46[" "]
        A47[" "] --> B47[" "]
        A48[" "] --> B48[" "]
        A49[" "] --> B49[" "]
        A50[" "] --> B50[" "]
        A51[" "] --> B51[" "]
        A52[" "] --> B52[" "]
        A53[" "] --> B53[" "]
        A54[" "] --> B54[" "]
        A55[" "] --> B55[" "]
        A56[" "] --> B56[" "]
        A57[" "] --> B57[" "]
        A58[" "] --> B58[" "]
        A59[" "] --> B59[" "]
        A60[" "] --> B60[" "]
        A61[" "] --> B61[" "]
        A62[" "] --> B62[" "]
        A63[" "] --> B63[" "]
        A64[" "] --> B64[" "]
        A65[" "] --> B65[" "]
        A66[" "] --> B66[" "]
        A67[" "] --> B67[" "]
        A68[" "] --> B68[" "]
        A69[" "] --> B69[" "]
        A70[" "] --> B70[" "]
        A71[" "] --> B71[" "]
        A72[" "] --> B72[" "]
        A73[" "] --> B73[" "]
        A74[" "] --> B74[" "]
        A75[" "] --> B75[" "]
        A76[" "] --> B76[" "]
        A77[" "] --> B77[" "]
        A78[" "] --> B78[" "]
        A79[" "] --> B79[" "]
        A80[" "] --> B80[" "]
        A81[" "] --> B81[" "]
        A82[" "] --> B82[" "]
        A83[" "] --> B83[" "]
        A84[" "] --> B84[" "]
        A85[" "] --> B85[" "]
        A86[" "] --> B86[" "]
        A87[" "] --> B87[" "]
        A88[" "] --> B88[" "]
        A89[" "] --> B89[" "]
    end
    subgraph RightPanel
        C1["A"] <--> D1["A"]
    end
    style LeftPanel fill:#f9f,stroke:#333
    style RightPanel fill:#bbf,stroke:#f66

Ⓐ To Outdoor Unit
B Sealed Piping

1. The Multi V will stop due to an abnormality like excessive or insufficient refrigerant. At such a time, always properly charge the unit. When servicing, always check the notes concerning both the piping length and the amount of additional refrigerant.
2. Never perform a pump down. This will not only damage the compressor but also deteriorate the performance.

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

4. Always insulate the piping properly. Insufficient insulation will result in a decline in heating/cooling performance, drip of condensate and other such problems.

5. When connecting the refrigerant piping, make sure the service valves of the Outdoor Unit is completely closed (the factory setting) and do not operate it until the refrigerant piping for the Outdoor and Indoor Units has been connected, a refrigerant leakage test has been performed and the evacuation process has been completed.
6. Always use a non-oxidizing brazing material for brazing the parts and do not use flux. If not, oxidized film can cause clogging or damage to the compressor unit and flux can harm the copper piping or refrigerant oil.

WARNING

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

• If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.
• After selecting diameter of the refrigerant pipe to suit total capacity of the indoor unit connected after branching, use an appropriate branch pipe set according to the pipe diameter of the indoor unit and the installation pipe drawing.

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 0.2kgf/cm^2 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 Side Pipe Draw Out Right Side Pipe Draw Out

Refrigerant Pipe Taping Regulator Nitrogen Direction Valve Nitrogen

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

Remove Area for Liquid/ Gas pipe Bottom side connections

■ 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/common 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

Method of drawing out pipes

■ 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.

Pure technical line drawing of a mechanical component with no text or symbols

Pipe Knock Out for Liquid/Gas pipes

Liquid pipe Gas pipe

■ Method of drawing out pipes on the bottom side

Liquid Pipe Gas Pipe

Remove only Liquid/ Gas pipe knock out

Technical line drawing of a mechanical assembly with pipes and components (no text or symbols)

View without base pan

■ Figure of Sides when drawing out through bottom pipe

View without Side Panel

Pure technical diagram of a mechanical or electrical component without any text, numbers, or symbols

Refrigerant piping system

◆ Y branch method

A H 50m L100m l40m a b c d e h15m 2 3 4 5

Ⓐ : Outdoor Unit

⑧ : 1st branch (Y branch)

©: Indoor Units

⑭ : Downward Indoor Unit

◆ Header Method

H 50m L 100m l 40m a b c d e f 1 15m 2 3 4 5 C C C C C C C C C C

Ⓐ : Outdoor Unit

⑧ : 1st branch

©: Indoor Units

⑭ : Sealed piping

◆ Combination of Y branch/header method

L 50m A B C E X F 3 4 5 L 100m 40m h 15m b c 1 2 D a ① ② ③ ④ ⑤ ⑥ ⑦

Ⓐ : Outdoor Unit

⑧ : 1st branch (Y branch)

© : Y branch

(D): Indoor Unit

⑤ : Header

⑤ : Sealed piping

Branch pipe can not be used after header

Refrigerant pipe length

			Y branch Header		Y branch/ Header
L Longest pipe length A+B+C+D+e ≤ 100 m A+f ≤ 100 m							A+B+b ≤ 100 m
							A+B+e ≤ 100 m
	Longest pipe length after 1st branch 40 m 40 m 40 m
H	Difference in height (Outdoor unit ↔ Indoor unit)		50 m 50 m 50 m
h	Difference in height (Indoor unit ↔ Indoor unit)		15 m 15 m 15 m
LTotal T	Total pipe length Equivalent pipe length 150 m 170 m 150 m			170 m 150 m	170 m 150 m	170 m

• * : Assume equivalent piping length of Y branch to be 0.5m, that of header to be 1m, calculation purpose.
• : It is recommended that indoor unit is installed at lower position than the header.
• The difference between the indoor unit pipe length can occur the difference in performance.

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

Outdoor unit Total capacity [kW (Btu/h)]	Standard pipe Diameter
	Liquid pipe[mm (inch)] Gas pipe	[mm (inch)]
22.4 (76,400)	∅9.52 (3/8)	∅19.05 (3/4)
28.0 (95,900)	∅9.52 (3/8)	∅22.2 (7/8)
33.6 (172,000)	∅12.7 (1/2)	∅25.58 (1 1/8)

☐ 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 )

◆ 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 130% is connected to 28kW outdoor unit.
  1) Outdoor unit main pipe diameter A : ∅22.2(Gas pipe), ∅9.52(Liquid pipe)
  2) Pipe diameter B after first branch according to 130% indoor unit combination (36.4kW); ∅28.58(Gas pipe), ∅12.7(Liquid pipe)
  Therefore, pipe diameter B connected after first branch would be ∅22.2(Gas pipe)/ ∅9.52(Liquid pipe) which is same with main pipe diameter

◆ 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)

◆ 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:Ø12.7 mm	× 0.118(kg/m)
+	Total liquid pipe:Ø9.52 mm	× 0.061(kg/m)
+	Total liquid pipe:Ø6.35 mm	× 0.022(kg/m)
+	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

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

CF value of indoor unit (unit : kg)

Capacity(Btu/h(kW))Type (1.6) (2.2) (2.8) (3.6) (4.5) (5.6) (7.1) (8.2) (10.6) (12.3) (14.1) (22.4) (28.0)
Ceiling Concealed Duct (Low Static) - 0.17 0.17 0.17 0.17 0.37 0.37 -						-	-	-	-	-	-
Ceiling Concealed Duct (High Static) - 0.26 0.26 0.26 0.26 0.26 0.26 0.44 0.44 0.44 0.62 1.00 1.00
Wall Mounted - 0.24 0.24 0.24 0.24 0.24 0.28 0.28 -
1Way Ceiling Cassette - 0.20 0.20 0.20 - 0.29 0.29 -
2Way Ceiling Cassette	-	-	-	-	-	0.16	0.16	-	-	-	-	-	-	-
4Way Ceiling Cassette	0.18	0.18	0.25	0.25	0.32	0.32	0.48	0.48	0.64	0.64	0.64	-	-
ARTCOOL Gallery	- 0.10 0.10 0.10 -
Floor Standing	- 0.17 0.17 0.17 0.17 0.17 0.37 0.37 -
Ceiling & Floor	-	-	0.10	0.10	-	-	-	-	-	-	-	-	-	-
Ceiling Suspended	-	-	-	-	-	0.35	0.35	-	0.54	-	0.75	-	-
Console	- 0.17 0.17 0.17 0.17 -
Heat recovery ventilator(DX)	-	-	-	0.20	-	0.20	0.20	-	-	-	-	-	-	-

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

≤ 0.44 (kg / m ^3 )

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

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

1. Installation of effective opening part
2. Reconfirmation of Outdoor Unit capacity and piping length
3. Reduction of the amount of refrigerant
4. Installation of 2 or more security device (alarm for gas leakage)

- Change Indoor Unit type

: installation position should be over 2m 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 Bottling

Liquid pipe Gas pipe

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

• Add exact amount of refrigerant calculated by the installation pipe diameter length and the indoor combination.
• If the refrigerant amount is not exact, it may not operate properly.
• If additionally bottled refrigerant amount is over ±10%, condenser burning or insufficient indoor unit performance may be caused.

WARNING

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

Distribution Method

1. Line Distribution

graph TD
    A["1st Main pipe Distribution"] --> B["1st"]
    B --> C["2nd Main pipe Distribution"]
    C --> D["2nd"]
    D --> E["3rd Main pipe Distribution"]
    E --> F["3rd"]
    F --> G["4th Main pipe Distribution"]
    G --> H["4th"]
    H --> I["5th Main pipe Distribution"]
    I --> J["5th"]
    J --> K["6th Main pipe Distribution"]
    K --> L["6th"]
    L --> M["7th Main pipe Distribution"]
    M --> N["7th"]
    N --> O["8th Main pipe Distribution"]
    O --> P["8th"]

graph TD
    A["Building"] -->|1st| B["Main Pipe"]
    B --> C["Subway 1"]
    B --> D["Subway 2"]
    B --> E["Subway 3"]
    C --> F["Subway 4"]
    D --> G["Subway 5"]
    E --> H["Subway 6"]
    F --> I["Main Pipe"]
    G --> I
    H --> I
    style A fill:#f9f,stroke:#333
    style I fill:#bbf,stroke:#333

2. Vertical Distribution

Ensure that the branch pipes are attached vertically.

graph TD
    A["Server"] --> B["Client 1"]
    A --> C["Client 2"]
    A --> D["Client 3"]
    A --> E["Client 4"]
    A --> F["Client 5"]
    A --> G["Client 6"]
    A --> H["Client 7"]
    A --> I["Client 8"]
    A --> J["Client 9"]
    A --> K["Client 10"]
    A --> L["Client 11"]
    A --> M["Client 12"]
    A --> N["Client 13"]
    A --> O["Client 14"]
    A --> P["Client 15"]

graph TD
    A["Server Rack"] --> B["Central Hub"]
    C["Server Rack"] --> B
    D["Server Rack"] --> B
    E["Server Rack"] --> B
    F["Server Rack"] --> B
    G["Terminal Tower"] --> B
    H["Terminal Tower"] --> B
    I["Terminal Tower"] --> B
    J["Terminal Tower"] --> B
    K["Terminal Tower"] --> B
    L["Terminal Tower"] --> B
    M["Terminal Tower"] --> B
    N["Terminal Tower"] --> B
    O["Terminal Tower"] --> B
    P["Terminal Tower"] --> B
    Q["Terminal Tower"] --> B
    R["Terminal Tower"] --> B
    S["Terminal Tower"] --> B
    T["Terminal Tower"] --> B
    U["Terminal Tower"] --> B
    V["Terminal Tower"] --> B
    W["Terminal Tower"] --> B
    X["Terminal Tower"] --> B
    Y["Terminal Tower"] --> B
    Z["Terminal Tower"] --> B

3. The others

graph TD
    A["Server"] --> B["Client 1"]
    A --> C["Client 2"]
    A --> D["Client 3"]
    A --> E["Client 4"]
    A --> F["Client 5"]
    A --> G["Client 6"]
    A --> H["Client 7"]
    A --> I["Client 8"]
    A --> J["Client 9"]
    A --> K["Client 10"]
    A --> L["Client 11"]
    A --> M["Client 12"]
    A --> N["Client 13"]
    A --> O["Client 14"]
    A --> P["Client 15"]

graph TD
    A["Server"] --> B["Header"]
    B --> C["Client 1"]
    B --> D["Client 2"]
    B --> E["Client 3"]
    B --> F["Client 4"]
    B --> G["Client 5"]
    B --> H["Client 6"]

Branch pipe Fitting

■ Y branch A B

Ⓐ To Outdoor Unit
⑧ To Branch Piping or Indoor 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 Insulator for field piping (field supply)

■ Header A B

Technical line drawing of a mechanical pipe fitting with a labeled component (no text or symbols present)

Ⓐ To outdoor unit
B) 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.

Tape Insulator Insulator of field pipe

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

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

◆ Y branch pipe

[unit:mm]

Models Gas pipe Liquid pipe
ARBLN01621
ARBLN03321
ARBLN07121

◆ 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

(1) Leak test

Leak test should be made by pressurizing nitrogen gas to 3.8 MPa(38.7kgf/cm ^2 ). 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["Liquid pipe"]
    C --> D["Gas pipe"]
    D --> E["Liquid side"]
    E --> F["Indoor unit"]
    E --> G["Gas side"]
    style A fill:#f9f,stroke:#333
    style F fill:#ccf,stroke:#333
    style G fill:#ccf,stroke:#333
    subgraph Outdoor unit
        B
        C
        D
    end

Note:

If the ambient temperature differs between the time when pressure is applied and when the pressure drop is checked, apply the following correction factor

There is a pressure change of approximately 0.1 kg/cm^2 (0.01 MPa) for each 1^ of temperature difference.

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

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

24 hour later: 3.73 MPa, 20°C

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

And hence there is no leakage in pipe occurred.

Caution:

To prevent the nitrogen from entering the refrigeration system in the liquid state, the top of the cylinder must be at higher position than the bottom when you pressurize the system.

Usually the cylinder is used in a vertical standing position.

(2) 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).

1. Evacuate the system from the liquid and gas pipes with a vacuum pump for over 2 hrs and bring the system to -100.7kPa. After maintaining system under that condition for over 1 hr, confirm the vacuum gauge rises. The system may contain moisture or leak.

2. Following should be executed if there is a possibility of moisture remaining inside the pipe. (Rainwater may enter the pipe during work in the rainy season or over a long period of time) After evacuating the system for 2 hrs, give pressure to the system to 0.05MPa (vacuum break) with nitrogen gas and then evacuate it again with the vacuum pump for 1hr to -100.7kPa (vacuum drying). If the system cannot be evacuated to -100.7kPa within 2 hrs, repeat the steps of vacuum break and its drying.

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

graph TD
    A["Vacuum pump"] --> B["Outdoor unit"]
    B --> C["Close"]
    B --> D["Liquid pipe"]
    B --> E["Gas pipe"]
    C --> F["Indoor unit"]
    D --> F
    E --> F
    G["Gas side"] --> F
    H["Liquid side"] --> F
    I["Close"] --> B
    J["Close"] --> B

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.

graph TD
    A["Vacuum mode setting method Vacuum mode cancellation method"] --> B["ODU power reset"]
    B --> C["Outdoor unit PCB DIP switch ON - DIP switch No. : 10, 12, 13"]
    C --> D["Press the black button Main PCB (5 sec.)"]
    D --> E["Vacuum mode setting ODU V/V OPEN Main EEV, SC EEV OPEN IDU EEV OPEN"]
    F["Outdoor unit PCB DIP switch OFF - DIP switch No. : 10, 12, 13"] --> G["Power reset"]
    G --> H["Vacuum mode cancellation"]

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

Heat insulation material	Adhesive + Heat - resistant polyethylene 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 pressure pipe together.	· Be sure to fully insulate connecting portion.
Good example

Penetrations

Inner wall (concealed)

Floor (fireproofing)

Technical diagram showing labeled components A, B, C, D, and F with cross-sectional views

Outer wall

C D A B

Roof pipe shaft

Outer wall (exposed)

Penetrating portion on fire limit and boundary wall

① ② A 1m 1m

Ⓐ Sleeve
B Heat insulating material
© Lagging
D Caulking material
E Band
⑤ Waterproofing layer
G Sleeve with edge
H Lagging material
① Mortar or other incombustible caulking
J 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

1. 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.

1. Install the Outdoor Unit transmission line 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.)
2. Be sure to provide designated grounding work to Outdoor Unit.

CAUTION

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

1. 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.
2. Never connect the main power source to terminal block of transmission line. If connected, electrical parts will be burnt out.
3. Use 2-core shield cable for transmission line.(O mark in the figure below) If transmission lines 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)
4. Only the transmission line specified should be connected to the terminal block for Outdoor Unit transmission.

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

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"]
    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:#cfc,stroke:#333
    style H fill:#fcc,stroke:#333
    style I fill:#cfc,stroke:#333

2-Core Shield Cable Multi-Core Cable

CAUTION

• Use the 2-core shield cables for transmission lines. Never use them together with power cables.
• The conductive shielding layer of cable should be grounded to the metal part of both units.
• Never use multi-core cable
• As this unit is equipped with an inverter, to install a phase leading capacitor not only will deteriorate power factor improvement effect, but also may cause capacitor abnormal heating. Therefore, never install a phase leading capacitor.
• Make sure that the power unbalance ratio is not greater than 2% . If it is greater the units lifespan will be reduced.

◆Precautions when laying power wiring

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

Round pressure terminal Power wire

When none are available, follow the instructions below.

• Do not connect wiring of different thicknesses to the power terminal block. (Slack in the power wiring may cause abnormal heat.)
• When connecting wiring which is the same thickness, do as shown in the figure below.

Simple line drawing of a container with two circular ports and a curved arrow, no text or symbols present.

Simple line drawing of a U-shaped structure with two circular elements inside, no text or symbols present.

Simple line drawing of a container with two circular objects inside, no text or symbols present

• For wiring, use the designated power wire and connect firmly, then secure to prevent outside pressure being exerted on the terminal block.
• Use an appropriate screwdriver for tightening the terminal screws. A screwdriver with a small head will strip the head and make proper tightening impossible.
  • Over-tightening the terminal screws may break them.

CAUTION

When the 400 volt power supply is applied to "N" phase by mistake, replace inverter PCB and transformer in control box.

Control box and connecting position of wiring

- Remove all of the screws at front panel and remove the panel by pulling it forward.

Technical line drawing of a multi-chamber industrial unit with ventilation grilles and cooling fans (no text or symbols)

Front Panel

• Connect transmission line between main and sub outdoor unit through the terminal block.
• Connect transmission lines 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 transmission line between outdoor unit and indoor units with shielded wire, connect the shield ground to the earth screw.

WARNING

The temperature sensor for outdoor air should not be exposed to direct sunlight.

- Provide an appropriate cover to intercept direct sunlight.

■ Heat pump

UX2 Main PCB Inverter fan PCB Noise filter Reactor Bridge diode Magnet switch Inverter PCB Take care of the phase sequence of 3-phase 4-wire power system

Transmission and Power Lines

1) Transmission cable

• Types : shielding wire
  • Cross section : 1.0\~1.5mm²
  • Maximum allowable temperature: 60°C
  • Maximum allowable line length: under 1000m

2) Remote control cable

- Types : 3-core cable

3) Central control cable

Product type	Wire type	Diameter
ACP&AC Manager	(2-shielding wire,2-core wire)	1.0 1.5mm^2
AC Smart	(2-shielding wire,2-core wire)	1.0 1.5mm^2
Simple central controller	(2-shielding wire,2-core wire)	1.0 1.5mm^2

4) Separation of transmission and power lines

- If transmission and power lines are run alongside each other then there is a strong likelihood of operational faults developing due to interference in the signal wiring caused by electrostatic and electromagnetic coupling.

The tables below indicate our recommendation as to appropriate spacing of transmission and power lines where these are to be run side by side

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

Note:

1. The figures are based on assumed length of parallel cabling up to 100m. For length in excess of 100m the figures will have to be recalculated in direct proportion to the additional length of line involved.
2. If the power supply waveform continues to exhibit some distortion the recommended spacing in the table should be increased.
3. If the lines are laid inside conduits then the following point must also be taken into account when grouping various lines together for introduction into the conduits
4. Power lines(including power supply to air conditioner) and signal lines must not be laid inside the same
5. In the same way, when grouping the lines power and signal lines 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

1. Use a separate power supply for the Outdoor Unit and Indoor Unit.
2. Bear in mind ambient conditions (ambient temperature, direct sunlight, rain water, etc.) when proceeding with the wiring and connections.
3. The wire size is the minimum value for metal conduit wiring. The power cord size should be 1 rank thicker taking into account the line voltage drops. Make sure the power-supply voltage does not drop more than 10%.
4. Specific wiring requirements should adhere to the wiring regulations of the region.
5. Power supply cords of parts of appliances for outdoor use should not be lighter than polychloroprene sheathed flexible cord.
6. 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 wires 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

1. 50Hz

◆ Example Connection of Communication Cable

■ 1 Outdoor Unit-3∅, 380-415V

graph TD
    A["3 Phase 4 Wires Power supply 50Hz 380-415V (Main Switch)"] --> B["Switch"]
    B --> C["Fuse"]
    C --> D["Outdoor Unit"]
    E["Power supply 1 Phase 50Hz 220-240V"] --> F["L N"]
    F --> G["Power Line (2 Wires Cable)"]
    G --> H["Pull Box (Installer option)"]
    H --> I["Power Line (2 Wires Cable)"]
    I --> J["Power Line (2 Wires Cable)"]
    J --> K["Power Line (2 Wires Cable)"]
    K --> L["Power Line (2 Wires Cable)"]
    L --> M["Power Line (2 Wires Cable)"]
    M --> N["Power Line (2 Wires Cable)"]
    N --> O["Power Line (2 Wires Cable)"]
    O --> P["Power Line (2 Wires Cable)"]
    P --> Q["Power Line (2 Wires Cable)"]
    Q --> R["Power Line (2 Wires Cable)"]
    R --> S["Power Line (2 Wires Cable)"]
    S --> T["Power Line (2 Wires Cable)"]
    T --> U["Power Line (2 Wires Cable)"]
    U --> V["Power Line (2 Wires Cable)"]
    V --> W["Power Line (2 Wires Cable)"]
    W --> X["Power Line (2 Wires Cable)"]
    X --> Y["Power Line (2 Wires Cable)"]
    Y --> Z["Power Line (2 Wires Cable)"]
    Z --> AA["Power Line (2 Wires Cable)"]
    AA --> AB["Power Line (2 Wires Cable)"]
    AB --> AC["Power Line (2 Wires Cable)"]
    AC --> AD["Power Line (2 Wires Cable)"]
    AD --> AE["Power Line (2 Wires Cable)"]
    AE --> AF["Power Line (2 Wires Cable)"]
    AF --> AG["Power Line (2 Wires Cable)"]
    AG --> AH["Power Line (2 Wires Cable)"]
    AH --> AI["Power Line (2 Wires Cable)"]
    AI --> AJ["Power Line (2 Wires Cable)"]
    AJ --> AK["Power Line (2 Wires Cable)"]
    AK --> AL["Power Line (2 Wires Cable)"]
    AL --> AM["Power Line (2 Wires Cable)"]
    AM --> AN["Power Line (2 Wires Cable)"]
    AN --> AO["Power Line (2 Wires Cable)"]
    AO --> AP["Power Line (2 Wires Cable)"]
    AP --> AQ["Power Line (2 Wires Cable)"]
    AQ --> AR["Power Line (2 Wires Cable)"]
    AR --> AS["Power Line (2 Wires Cable)"]
    AS --> AT["Power Line (2 Wires Cable)"]
    AT --> AU["Power Line (2 Wires Cable)"]
    AU --> AV["Power Line (2 Wires Cable)"]
    AV --> AW["Power Line (2 Wires Cable)"]
    AW --> AX["Power Line (2 Wires Cable)"]
    AX --> AY["Power Line (2 Wires Cable)"]
    AY --> AZ["Power Line (2 Wires Cable)"]
    AZ --> BA["Power Line (2 Wires Cable)"]
    BA --> BB["Power Line (2 Wires Cable)"]
    BB --> BC["Power Line (2 Wires Cable)"]
    BC --> BD["Power Line (2 Wires Cable)"]
    BD --> BE["Power Line (2 Wires Cable)"]
    BE --> BF["Power Line (2 Wires Cable)"]
    BF --> BG["Power Line (2 Wires Cable)"]
    BG --> BH["Power Line (2 Wires Cable)"]
    BH --> BI["Power Line (2 Wires Cable)"]
    BI --> BJ["Power Line (2 Wires Cable)"]
    BJ --> BK["Power Line (2 Wires Cable)"]
    BK --> BL["Power Line (2 Wires Cable)"]
    BL --> BM["Power Line (2 Wires Cable)"]
    BM --> BN["Power Line (2 Wires Cable)"]
    BN --> BO["Power Line (2 Wires Cable)"]
    BO --> BP["Power Line (2 Wires Cable)"]
    BP --> BQ["Power Line (2 Wires Cable)"]
    BQ --> BR["Power Line (2 Wires Cable)"]
    BR --> BS["Power Line (2 Wires Cable)"]
    BS --> BT["Power Line (2 Wires Cable)"]
    BT --> BU["Power Line (2 Wires Cable)"]
    BU --> BV["Power Line (2 Wires Cable)"]
    BV --> BW["Power Line (2 Wires Cable)"]
    BW --> BX["Power Line (2 Wires Cable)"]
    BX --> BY["Power Line (2 Wires Cable)"]
    BY --> BZ["Power Line (2 Wires Cable)"]
    BZ --> CA["Power Line (2 Wires Cable)"]
    CA --> CB["Power Line (2 Wires Cable)"]
    CB --> CC["Power Line (2 Wires Cable)"]
    CC --> CD["Power Line (2 Wires Cable)"]
    CD --> CE["Power Line (2 Wires Cable)"]
    CE --> CF["Power Line (2 Wires Cable)"]
    CF --> CG["Power Line (2 Wires Cable)"]
    CG --> CH["Power Line (2 Wires Cable)"]
    CH --> CI["Power Line (2 Wires Cable)"]
    CI --> CJ["Power Line (2 Wires Cable)"]
    CJ --> CK["Power Line (2 Wires Cable)"]
    CK --> CL["Power Line (2 Wires Cable)"]
    CL --> CM["Power Line (2 Wires Cable)"]
    CM --> CN["Power Line (2 Wires Cable)"]
    CN --> CO["Power Line (2 Wires Cable)"]
    CO --> CP["Power Line (2 Wires Cable)"]
    CP --> CQ["Power Line (2 Wires Cable)"]
    CQ --> CR["Power Line (2 Wires Cable)"]
    CR --> CS["Power Line (2 Wires Cable)"]
    CS --> CT["Power Line (2 Wires Cable)"]
    CT --> CU["Power Line (2 Wires Cable)"]
    CU --> CV["Power Line (2 Wires Cable)"]
    CV --> CW["Power Line (2 Wires Cable)"]
    CW --> CX["Power Line (2 Wires Cable)"]
    CX --> CY["Power Line (2 Wires Cable)"]
    CY --> CZ["Power Line (2 Wires Cable)"]
    CZ --> DA["Power Line (2 Wires Cable)"]
    DA --> DB["Power Line (2 Wires Cable)"]
    DB --> DC["Power Line (2 Wires Cable)"]
    DC --> DD["Power Line (2 Wires Cable)"]
    DD --> DE["Power Line (2 Wires Cable)"]
    DE --> DF["Power Line (2 Wires Cable)"]
    DF --> DG["Power Line (2 Wires Cable)"]
    DG --> DH["Power Line (2 Wires Cable)"]
    DH --> DI["Power Line (2 Wires Cable)"]
    DI --> DJ["Power Line (2 Wires Cable)"]
    DJ --> DK["Power Line (2 Wires Cable)"]
    DK --> DL["Power Line (2 Wires Cable)"]
    DL --> DV["Power Line (2 Wires Cable)"]
    DV --> DW["Power Line (2 Wires Cable)"]
    DW --> DX["Power Line (2 Wires Cable)"]
    DX --> DY["Power Line (2 Wires Cable)"]

WARNING

• Indoor Unit ground Lines 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 outdoor unit

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

2. 60 ~Hz

◆ Example Connection of Communication Cable

■ 1 Outdoor Unit - 30, 380V

graph TD
    A["3 Phase 4 Wires Power supply 60Hz 380V (Main Switch)"] --> B["Switch"]
    B --> C["Fuse"]
    C --> D["Outdoor Unit"]
    E["Power supply 1 Phase 60Hz 220V"] --> F["Pull Box (Installer option)"]
    F --> G["Power Line (2 Wires Cable)"]
    G --> H["Power Line (2 Wires Cable)"]
    H --> I["Power Line (2 Wires Cable)"]
    I --> J["Power Line (2 Wires Cable)"]
    J --> K["Power Line (2 Wires Cable)"]
    K --> L["Power Line (2 Wires Cable)"]
    L --> M["Power Line (2 Wires Cable)"]
    M --> N["Power Line (2 Wires Cable)"]
    N --> O["Power Line (2 Wires Cable)"]
    O --> P["Power Line (2 Wires Cable)"]
    P --> Q["Power Line (2 Wires Cable)"]
    Q --> R["Power Line (2 Wires Cable)"]
    R --> S["Power Line (2 Wires Cable)"]
    S --> T["Power Line (2 Wires Cable)"]
    T --> U["Power Line (2 Wires Cable)"]
    U --> V["Power Line (2 Wires Cable)"]
    V --> W["Power Line (2 Wires Cable)"]
    W --> X["Power Line (2 Wires Cable)"]
    X --> Y["Power Line (2 Wires Cable)"]
    Y --> Z["Power Line (2 Wires Cable)"]
    Z --> AA["Power Line (2 Wires Cable)"]
    AA --> AB["Power Line (2 Wires Cable)"]
    AB --> AC["Power Line (2 Wires Cable)"]
    AC --> AD["Power Line (2 Wires Cable)"]
    AD --> AE["Power Line (2 Wires Cable)"]
    AE --> AF["Power Line (2 Wires Cable)"]
    AF --> AG["Power Line (2 Wires Cable)"]
    AG --> AH["Power Line (2 Wires Cable)"]
    AH --> AI["Power Line (2 Wires Cable)"]
    AI --> AJ["Power Line (2 Wires Cable)"]
    AJ --> AK["Power Line (2 Wires Cable)"]
    AK --> AL["Power Line (2 Wires Cable)"]
    AL --> AM["Power Line (2 Wires Cable)"]
    AM --> AN["Power Line (2 Wires Cable)"]
    AN --> AO["Power Line (2 Wires Cable)"]
    AO --> AP["Power Line (2 Wires Cable)"]
    AP --> AQ["Power Line (2 Wires Cable)"]
    AQ --> AR["Power Line (2 Wires Cable)"]
    AR --> AS["Power Line (2 Wires Cable)"]
    AS --> AT["Power Line (2 Wires Cable)"]
    AT --> AU["Power Line (2 Wires Cable)"]
    AU --> AV["Power Line (2 Wires Cable)"]
    AV --> AW["Power Line (2 Wires Cable)"]
    AW --> AX["Power Line (2 Wires Cable)"]
    AX --> AY["Power Line (2 Wires Cable)"]
    AY --> AZ["Power Line (2 Wires Cable)"]
    AZ --> BA["Power Line (2 Wires Cable)"]
    BA --> BB["Power Line (2 Wires Cable)"]
    BB --> BC["Power Line (2 Wires Cable)"]
    BC --> BD["Power Line (2 Wires Cable)"]
    BD --> BE["Power Line (2 Wires Cable)"]
    BE --> BF["Power Line (2 Wires Cable)"]
    BF --> BG["Power Line (2 Wires Cable)"]
    BG --> BH["Power Line (2 Wires Cable)"]
    BH --> BI["Power Line (2 Wires Cable)"]
    BI --> BJ["Power Line (2 Wires Cable)"]
    BJ --> BK["Power Line (2 Wires Cable)"]
    BK --> BL["Power Line (2 Wires Cable)"]
    BL --> BM["Power Line (2 Wires Cable)"]
    BM --> BN["Power Line (2 Wires Cable)"]
    BN --> BO["Power Line (2 Wires Cable)"]
    BO --> BP["Power Line (2 Wires Cable)"]
    BP --> BQ["Power Line (2 Wires Cable)"]
    BQ --> BR["Power Line (2 Wires Cable)"]
    BR --> BS["Power Line (2 Wires Cable)"]
    BS --> BT["Power Line (2 Wires Cable)"]
    BT --> BU["Power Line (2 Wires Cable)"]
    BU --> BV["Power Line (2 Wires Cable)"]
    BV --> BW["Power Line (2 Wires Cable)"]
    BW --> BX["Power Line (2 Wires Cable)"]
    BX --> BY["Power Line (2 Wires Cable)"]
    BY --> BZ["Power Line (2 Wires Cable)"]
    BZ --> CA["Power Line (2 Wires Cable)"]
    CA --> CB["Power Line (2 Wires Cable)"]
    CB --> CC["Power Line (2 Wires Cable)"]
    CC --> CD["Power Line (2 Wires Cable)"]
    CD --> CE["Power Line (2 Wires Cable)"]
    CE --> CF["Power Line (2 Wires Cable)"]
    CF --> CG["Power Line (2 Wires Cable)"]
    CG --> CH["Power Line (2 Wires Cable)"]
    CH --> CI["Power Line (2 Wires Cable)"]
    CI --> CJ["Power Line (2 Wires Cable)"]
    CJ --> CK["Power Line (2 Wires Cable)"]
    CK --> CL["Power Line (2 Wires Cable)"]
    CL --> CM["Power Line (2 Wires Cable)"]
    CM --> CN["Power Line (2 Wires Cable)"]
    CN --> CO["Power Line (2 Wires Cable)"]
    CO --> CP["Power Line (2 Wires Cable)"]
    CP --> CQ["Power Line (2 Wires Cable)"]
    CQ --> CR["Power Line (2 Wires Cable)"]
    CR --> CS["Power Line (2 Wires Cable)"]
    CS --> CT["Power Line (2 Wires Cable)"]
    CT --> CU["Power Line (2 Wires Cable)"]
    CU --> CV["Power Line (2 Wires Cable)"]
    CV --> CW["Power Line (2 Wires Cable)"]
    CW --> CX["Power Line (2 Wires Cable)"]
    CX --> CY["Power Line (2 Wires Cable)"]
    CY --> CZ["Power Line (2 Wires Cable)"]
    CZ --> DA["Power Line (2 Wires Cable)"]
    DA --> DB["Power Line (2 Wires Cable)"]
    DB --> DC["Power Line (2 Wires Cable)"]
    DC --> DD["Power Line (2 Wires Cable)"]
    DD --> DE["Power Line (2 Wires Cable)"]
    DE --> DF["Power Line (2 Wires Cable)"]
    DF --> DG["Power Line (2 Wires Cable)"]
    DG --> DH["Power Line (2 Wires Cable)"]
    DH --> DI["Power Line (2 Wires Cable)"]
    DI --> DJ["Power Line (2 Wires Cable)"]
    DJ --> DK["Power Line (2 Wires Cable)"]
    DK --> DL["Power Line (2 Wires Cable)"]
    DL --> DV["Power Line (2 Wires Cable)"]
    DV --> DW["Power Line (2 Wires Cable)"]
    DW --> DX["Power Line (2 Wires Cable)"]
    DX --> DY["Power Line (2 Wires Cable)"]

WARNING

• Indoor Unit ground Lines 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 outdoor unit

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

◆ Example Connection of Com

[BUS type]

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

3munication Cable

[STAR type]

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

graph TD
    A["Central Server"] --> B["Module 1"]
    A --> C["Module 2"]
    A --> D["Module 3"]
    A --> E["Module 4"]
    A --> F["Module 5"]
    A --> G["Module 6"]
    A --> H["Module 7"]
    A --> I["Module 8"]
    A --> J["Module 9"]
    A --> K["Module 10"]
    A --> L["Module 11"]
    A --> M["Module 12"]

graph TD
    A["Server"] --> 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

◆ UX2 Chassis Wire Connection

Left Side Power/ Ground lines Over 50mm Gap Communication line Main Power Terminal Block Ground Cable

Right Side Main Power Terminal Block Ground Cable Power/ Ground lines Over 50mm Gap Communication line

Front Side 1 Main Power Terminal Block Ground Cable Power/ Ground lines Over 50mm Gap Communication line

Front Side 2 Main Power Terminal Block Ground Cable Power/Ground lines Over 50mm Gap Communication line

Main Power Terminal Block Insulation sleeves attachments Ground Cable Ground Cable Fix firmly not to be displaced

Main PCB ConnectionMain Power Connection S-DCB MTB217 M1035C ODU-IDU Communication line

Location of setting dip switch

■ Heat Pump

SW01B SW02B 8:8.8 7 - Segment SW02V (Auto Addressing)

DIP switch setting

- Checking according to dip switch setting

1. 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.

1. It checks whether the input is properly performed without the bad contact of the dip switch or not

- Checking the setting of the Master unit

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

Outdoor unit model code → Total capacity → 2 → 25 → 155

1\~255 : Outdoor unit model code → Refer to table code

8\~12 HP : Hp number

2 : Heat pump

25 : Normal

155 : Model Type

Example) 12HP, R410A

$$ 1 4 \rightarrow 1 2 \rightarrow 2 \rightarrow 2 5 \rightarrow 1 5 7 $$

CAUTION

Product may not properly operate if the relevant DIP switch is not properly setup.

Model Code

Model Code	Unit (HP) Unit Ref.
12	8	Master R4	10A
13 10
14 12

Model Type

Model Type Unit (HP) Unit Ref.
155 8		Master R4	10A157 10
157 12

■ Setting the DIP switch

- Heat pump

- If you set the Dip switch when power is on, the changed setting will not be applied immediately. The changed setting will be enabled only when Power is reset or by pressing Reset button.

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7

ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Index 1 2 3 4 5 6 7 8 9 10

11

12

13

14

Function

Auto charging

●

●

●

×

×

Refrigerant Checking Function

●

●

●

×

●

Integrated test operation function (Cooling)

●

●

×

●

×

Integrated test operation function (Heating)

●

●

×

●

●

Inverter backup

●

Dry contact

●

●

×

Snow removal fuction

●

×

Forced defrost

×

●

Snow removal+Forced defrost

●

●

Static pressure mode

×

×

×

●

×

Nigh low noise operation (Cooling only)

●

×

Night low noise operation (Cooling/Heating)

●

●

Pump down

●

Pump out

●

Vacuum mode

●

×

×

Selector Fan/ All OFF

×

×

●

●

×

ODU Address setting

●

×

CAUTION

1. 'X' mark within the table means that the dip switch must be pulled down. If not, the function may not work properly.
2. If the applicable dip switch is not set properly, the product may not work properly.
3. When executing the test operation, check the operating condition of the indoor unit and only execute the operation when all indoor units are stopped.
4. Auto test operation function does not work for the product where only one indoor unit is connected for use.

Automatic Addressing

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

1) Wait for 3 minutes after supplying power. (Outdoor Unit, Indoor unit)
2) Press RED button of the outdoor units for 5 seconds. (SW02V)
3) A "88" is indicated on 7-segment LED of the outdoor unit PCB.
4) For completing addressing, 2\~7 minutes are required depending on numbers of connected indoor units
5) Numbers of connected indoor units whose addressing is completed are indicated for 30 seconds on 7-segment LED of the outdoor unit PCB
6) After completing addressing, address of each indoor unit is indicated on the wired remote control display window. (CH01, CH02, CH03, ....., CH06 : Indicated as numbers of connected indoor units)

■ Main PCB

SW01B SW02B 7 - Segment SW02V (Auto Addressing)

CAUTION

• In replacement of the indoor unit PCB, always perform Auto 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.
• Auto 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. (SW02V)"]
    C --> D["7-segment LED = 88"]
    D --> E["Don't press RED Button (SW02V)"]
    E --> F["Waiting about 2~7 minutes"]
    F --> G{7-segment LED = 88}
    G -->|YES| H["OK"]
    G -->|NO Check the connections| I["of transmission line"]
    I --> J["Auto addressing setting end\nNumbers of indoor unit connection set whose addressing is completed are indicated for 30seconds on 7-segment LED after completing setting"]
    J --> K["Press RED Button for 5 sec. (SW02V)"]
    K --> L["Auto addressing start"]
    L --> D
    G --> M["Indoor address number is displayed on wired remote control or indoor unit display window. It is not an error message, will disappeared when on/off button is pressed on remote control ex) Display of 01, 02, ..., 15 means connection of 15 indoor units and auto addressing is completed normally."]

Group Number setting

Group Number setting for Indoor Units

① Confirm the power of whole system(Indoor Unit, Outdoor Unit) is OFF, otherwise turn off.
② The transmission lines connected to INTERNET terminal should be connected to central control of Outdoor Unti with care for their polarity( A → A, B → B )
③ Turn the whole system on.
④ Set the group and Indoor Unit number with a wired remote control.
⑤ To control several sets of Indoor Units into a group, set the group ID from 0 to F for this purpose.

Outdoor Units

SODU IDU INTERNET DRY1 DRY2 GND 12V B A B A B A B(D) A(C)

Example) Group number setting

1 F

Indoor unitGroup

1^st number indicate the group number

2^nd number point out indoor unit number

Group recognizing the simple central controller

No.0 group (00~0F)

No.1 group (10~1F)

No.2 group (20~2F)

No.3 group (30~3F)

No.4 group (40~4F)

No.5 group (50~5F)

No.6 group (60~6F)

No.7 group (70~7F)

No.8 group (80~8F)

No.9 group (90~9F)

No. A group (A0~AF)

No. B group (B0~BF)

No. C group (C0~CF)

No. D group (D0~DF)

No. E group (E0~EF)

No. F group (F0~FF)

Cool and Heater Selector Installation and Connection

• Connect wires as below figure at the hole of backside of Outdoor Unit Dry Contact.
• Insert the wire in the connection hole pushing the "Push" button.
• Setting Main PCB Dip SW of Master Outdoor Unit.

GND shows field wiring connected wiring Push Button - Insert wire method - Push arrow direction. Insert wire to connector.

* Communication line length can be maximum 300m, use communication line as thick as 1.25mm2.

Without Cool/Heat Selector Installation and Connection

In case, try to set mode without Cool/Heat Selector and try to use other switch except from LG Outdoor Cool/Heat Selector in field.

Connect signal terminal block as below figure and description.

- How to set mode without Cool/Heat Selector

• Cooling Mode Setting
① → GND Connection
② → Off (Open)

• Heating Mode Setting
① → GND Connection
② → GND Connection

• Fan/ All OFF Mode Setting
① → Off (Open)
② → GND Connection

Test Run

Checks Before Test Run

1	Check to see whether there is any refrigerant leakage, and slack of power or transmission cable.
2	Confirm that 500 V megger shows 2 MΩ or more between power supply terminal block and ground.Do not operate in the case of 2 MΩ or less.NOTE: Never carry out megaohm check over terminal control board. Otherwise the control board would be broken.Immediately after mounting the unit or after leaving it turned off for an extended length of time,the resistance of the insulation between the power supply terminal board and the ground may decrease to approx. 2 MΩ as a result of refrigerant accumulating in the internal compressor.If the insulation resistance is less than 2 MΩ, turning on the main power supply and energizing the crankcase heater for more than 6 hours will cause the refrigerant to evaporate, increasing the insulation resistance.
3	Check if high/low pressure common pipe, liquid pipe and gas pipe valves are fully opened.NOTE: Be sure to tighten caps.
4	Check if there are any problems in automatic addressing or not:Check and confirm that there are no error messages in the display of indoor units or remote controls and LED in outdoor units.

Functions of each Test run steps

(Use above LG MV 6.1 version if you want to issue integrated test run report)

Step 0. Verify the command signals

Select function to be executed during the test run

Step 1 Refrigerant Automatic Recharge

If additional bottling of the refrigerant is needed, operate to perform this automatically.

Step 2. Automatic Refrigerant Decisions

Inspect if the bottled refrigerant in the system has adequate quantity.

Step 3. Integrated Test Run

Process to verify the normal operations of the parts attached to the system, and verify normal operation of the system.

* Gas pipes and Liquid pipes connections inspection

: Inspect whether the gas pipes and Liquid pipes are connected to each other.

CAUTION

when cutting main power of the Multi V

• Always apply main power of the outdoor unit during use of product (cooling season/heating season).
• Always apply power 6 hours in advance to heat the crank case heater where performing test run after installation of product. It may result in burning out of the compressor if not preheating the crank case with the electrical heater for more than 6 hours.(In case of the outdoor temperature below 10^ )

How to Cope with Test Run Abnormality

The phenomena from main component failure

Component	Phenomenon	Cause	Check method and Trouble shooting
Compressor	Not operating	Motor insulation broken	Check resistance between terminals and chassis
		Strainer clogged	Change strainer
		Oil leakage	Check oil amount after opening oil port
	Stop during running	Motor insulation failure	Check resistance between terminals and chassis
	Abnormal noise during running	R-S-T misconnection	Check compressor R-S-T connection
Outdoor fan	High pressure error at cooling	Motor failure, bad ventilation around outdoor heat exchanger	Check the outdoor fan operation after being turned the outdoor units off for some time. Remove obstacles around the outdoor units
Outdoor EEV	Heating failure, frequent defrosting	Bad connector contact	Check connector
	No operating sound at applying power	Coil failure	Check resistance between terminals
	Heating failure, frozen outdoor heat exchanger part	EEV clogged	Service necessary
	Low pressure error or discharge temperature error	EEV clogged	Service necessary

When system fault occurs, the error code is displayed at indoor unit display or remote control display, the trouble shooting guide is in the service manual

Method for FDD DIP Switch Setting

Following flow chart shows how to work FDD function and method for FDD DIP switch setting

graph TD
    A["Start"] --> B["DIP switch set"]
    B --> C["Setting 1 Setting 2 Setting 3 Setting 4"]
    C --> D["Press black button"]
    D --> E["Setting 1 Setting 2 Setting 3 Setting 4"]
    E --> F["Refrigerant Auto Recharge"]
    E --> G["Refrigerant Auto Decide"]
    E --> H["Integrated Test Run Cooling"]
    E --> I["Integrated Test Run Heating"]
    F --> J["Start inspection of each function"]
    G --> J
    H --> J
    I --> J
    style D fill:#f9f,stroke:#333
    note right of D: * Press the black button until setting number to show up
    end

WARNING

• Please confirm if auto-addressing function was executed. (Check the number of installed indoor units)
  • Each step is displayed on the Main PCB LED.

DIP Switch Settings

- Setting1 (Refrigerant Auto Recharge)

- Setting2 (Refrigerant Quantity Auto Decide)

- Setting3 (Integrated Test Run - cooling)

- Setting4 (Integrated Test Run - heating)

Warning : Please reset Main PCB before starting this function

Refrigerant Auto Charging (Setting 1)

This function charges appropriate amount of refrigerant automatically through cycle operation. It can be used when refrigerant amount Isn't certain because of SVC and leakage.

graph TD
    A["Start"] --> B["Wait for 3 min. after power reset"]
    B --> C["Set the Dip S/W.<br>(Refer to DIP S/W setting)"]
    C --> D["Press the black button.<br>(Press until '508' is displayed)"]
    D --> E["Press the black button."]
    E --> F["IDU runs with cooling mode In designated order."]
    F --> G{Is it necessary to charge refrigerant?}
    G -->|No| H["IDU and ODU are turned off when Auto Charging is completed. Close the valve."]
    G -->|Yes| I["Press the black button"]
    I --> J["Refrigerant Auto Charging Process"]
    J --> K["568"]
    J --> L["578"]
    J --> M["588"]
    L --> N["329"]
    M --> O["938"]
    M --> P["000"]
    O --> Q["Main PCB SW01V"]
    P --> Q
    Q --> R["Press the black button for 2 sec. after turning off all of dip S/W."]
    R --> S["Completed."]

DIP Switch Settings

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7

ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Warning : Please reset Main PCB before starting this function

Note

1. After installing the refrigerant charging device, 568 as shown in figure, open the valve
2. In case air temperature is out of guaranteed temperature, it may end without performing Auto charging
3. Refrigerant charging Time may change according to the charging amount. (Abt. 1.5min/lb)

Liquid Pipe Gas Pipe manifold Capillary Assembly

Procedure

1. Arrange manifold, capillary assembly, refrigerant vessel and scale
2. Connect manifold to the gas pipe service valve of ODU as shown in the figure.

3. Connect manifold and Capillary tube.
   Use designated capillary assembly only.
   If designated capillary assembly isn't used, the system may get damaged.

4. Connect capillary and refrigerant vessel.

5. Purge hose and manifold.

6. After 558 Is displayed, open the valve and charge the refrigerant

■ Error contents about auto refrigerant charging function

1. Temperature Range Error (In case that IDU or ODU is out of range)
2. Pressure Descent Error (In case the system runs at low pressure limit for over 10 minutes)
3. 349 ing rapid refrigerant inflow ( In case the liquid refrigerant flows in because of not using designated Capillary Assembly)
4. 358 bility Error( In case the high/low pressure target doesn't get satisfied for some time after the starting operation)

CAUTION

1. Guaranteed temperature range (Error will occur if temperature is out of range)
   IDU : 20°C(68°F) \~ 32°C(90°F)
   ODU : 0°C(32°F) \~ 43°C (77°F)
2. For refrigerant charging, use designated device only. (Capillary Assem Set)
3. Set the IDU wired remote controller temperature sensing mode as IDU
4. Be careful that IDU should not be thermo off.

Refrigerant Checking Function (Setting 2)

This function judges refrigerant leakage and overcharging. It can be used with refrigerant auto charging function.

graph TD
    A["608 Inspection Start"] --> B["Press black button for 2 seconds"]
    B -->|YES| C{Proper Temperature}
    B -->|NO| D["Display Error"]
    C --> E{Thermo off indoor unit}
    E -->|YES| F["Decide Refrigerant Quantity"]
    E -->|NO| G["End"]
    F --> H{Based on Refrigerant Quantity}
    H --> I["619 Too much Refrigerant"]
    H --> J["629 Not enough Refrigerant"]
    H --> K["639 Cannot tell Quantity"]
    H --> L["649 Refrigerant Quantity Normal"]
    H --> M["659 Gas/Liquid pipe direct connection"]
    I --> N["Indoor Unit OFF"]
    J --> N
    K --> N
    L --> N
    M --> N
    N --> O["Data Reset and Wait"]
    D --> P["329"]
    G --> Q["609 Display Error"]
    Q --> R["Press black button for 2 seconds"]
    R --> S["End"]
    S --> T["Press black button for 2 seconds"]

DIP Switch Settings

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7

ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Warning : Please reset Main PCB before starting this function

Note

1. In case air temperature is out of guaranteed temperature, refrigerant checking function may end without performing refrigerant checking. Use guaranteed temperature range only.
2. During the process of judging refrigerant amount, if the cycle isn't stable, refrigerant checking function may end without performing refrigerant checking.

CAUTION

1. Guaranteed Temperature range(Error occurs out of guaranteed temperature range)
   IDU : 20 \~ 35 °C
   ODU : 0 \~ 43 °C

2. Set IDU wired remote controller temperature sensor setting as 'IDU'.

3. Make certain that IDU doesn't run with thermo off mode during operation.

[Error contents about auto refrigerant charging function]

1. Temperature Range Error (In case that IDU or ODU is out of range)

2. 60% Item Unstable Error (In case, After 45 min operating the system, it does not be stable)

How to Cope with Result of Refrigerant checking

1. If the temperature is not in guaranteed Temperature range, the system will not execute Refrigerant checking and the system will be OFF.
2. Excess of Refrigerant(619)
   After remove the 20% of calculated total refrigerant, recharge the refrigerant by using Refrigerant Auto Charging Function.
3. Scarcity of Refrigerant(629)
   Charge the refrigerant by using Refrigerant Auto Charging Function.
4. Impossible to Judge(639)
   IF the system is not in order, check the other problem except refrigerant.

Integrated Test Running Function\_Cooling Mode (Setting 3)

This function is checking process for normal operation of parts and system On operating system.

• All processes carry out included refrigerant amount judge logic and check normal condition of parts on cooling mode.
• This function check only normal condition of parts on heating mode.
• Saved data can check using LGMV.

graph TD
    A["Start"] --> B["Press the black button for 2 sec"]
    B --> C{All IDU operation on Fan mode}
    C --> D{Temp. Condition}
    D --> E["1 IDU operation"]
    E --> F["(All-1) IDU operation"]
    F --> G["All IDU operation (refrigerant check)"]
    G --> H["System off"]
    H --> I["Error Display"]
    I --> J["End"]
    J --> K["Press the black button for 2 sec after turning off all of Dip switch."]
    K --> L["Completed"]
    C --> M["329"]
    F --> N["609"]
    N --> O["Error Display"]
    O --> P["Press black button for 2 sec"]
    P --> Q["End"]
    Q --> R["938"]
    R --> S["800"]
    S --> T["Completed"]

DIP Switch Settings

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7

ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Warning : Please reset Main PCB before starting this function

Note

1. Judge the normal condition refer to report of Test Running.

Integrated Test Running Function\_Heating Mode (Setting 4)

This function is checking process for normal operation of parts and system On operating system.

• All processes carry out included refrigerant amount judge logic and check normal condition of parts on heating mode.
• This function check only normal condition of parts on heating mode.
• Saved data can check using LGMV.

graph TD
    A["Start"] --> B["Press the black button for 2 sec."]
    B --> C{Temp. Condition}
    C -->|Yes| D["Error Display"]
    C -->|No| E["Error Display"]
    D --> F["All IDU operation data(10min)"]
    F --> G["(All-1) IDU operation"]
    G --> H["1 IDU operation"]
    H --> I["Oil return operation"]
    I --> J["System off"]
    J --> K["End"]
    K --> L["Press the black button for 2 sec. after turning off all of Dip switch."]
    L --> M["Completed"]

DIP Switch Settings

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7

ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Warning : Please reset Main PCB before starting this function

Note

1. Judge the normal condition refer to report of Test Running.

CAUTION

1. Guaranteed Temperature range(Error occurs out of guaranteed temperature range)

IDU : 20 \~ 35 °C

ODU : 0 \~ 43 °C

1. Set IDU wired remote controller temperature sensor setting as 'IDU'.
2. Make certain that IDU doesn't run with thermo off mode during operation.

[Error contents about auto refrigerant charging function]

1. Temperature Range Error (In case that IDU or ODU is out of range)
2. 60% Item Unstable Error (In case, After 45 min operating the system, it does not be stable)

How to Cope with Result of Refrigerant checking

1. If the temperature is not in guaranteed Temperature range, the system will not execute Refrigerant checking and the system will be OFF.
2. Excess of Refrigerant(619)

After remove the 20% of calculated total refrigerant, recharge the refrigerant by using Refrigerant Auto Charging Function.

1. Scarcity of Refrigerant(629)

Charge the refrigerant by using Refrigerant Auto Charging Function.

1. Impossible to Judge(639)

IF the system is not in order, check the other problem except refrigerant.

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.

Max. RPM setting method

graph TD
    A["Set the DIP S/W"] --> B["Reset the power"]
    B --> C["Setting the Fan Max. RPM"]
    C --> D["Setting Complete"]

Example of Max. RPM Setting

Setting Method for Fan Max. RPM

Step Black	Button Red Button
1 1 time	time
2 2 time	time
3 3 time	time
4 4 time	time
5 5 time	time
6 6 time	time
7 7 time	time
8 8 time	time
9 9 time	time

RPM / Time Settings

		Capacity			Judgment Time(Hr)	Operation Time(Hr)
Heat Pump		16kW	23~35kW	41~58kW
Cooling Only		16~23kW	29~41kW	46~58kW
Step		Fan Maximum RPM
1	1	730	790	900	8	9
2					6.5 10.5
3					5	12
4	2	620	680 800		8	9
5					6.5 10.5
6					5	12
7	3	510 620	780		8	9
8					6.5 10.5
9					5	12

Noise

	Capacity
Heat Pump	16kW	23~35kW	41~58kW
Cooling Only	16~23kW	29~41kW	46~58kW
Step	Noise(dB)
Standard	56 58 62
1	53 55 59
2	50 52 56
3	47 49 53

DIP Switch Settings

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7

ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Warning : Please reset Main PCB before starting this function

CAUTION

1. Request installer to set the function during installation.
2. In case the function is not used, set the dip S/W OFF and reset the power.
3. If ODU RPM changes, cooling capacity may go down.

Vacuum Mode

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

graph TD
    A["Vacuum mode setting method Vacuum mode cancellation"] --> B["ODU power reset"]
    B --> C["Set the DIP S/W ON"]
    C --> D["Press the black button Main PCB (5 sec.)"]
    D --> E["Vacuum mode setting ODU V/V OPEN\nMain EEV, SC EEV OPEN\nIDU EEV OPEN"]
    F["Set the DIP S/W OFF"] --> G["Power reset"]
    G --> H["Vacuum mode cancellation"]

DIP Switch Settings

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7

ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Warning : Please reset Main PCB before starting this function

CAUTION

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

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 dip S/W setting method

High static pressure mode : Set DIP S/W

graph TD
    A["Static pressure compensation mode setting method"] --> B["Set the DIP S/W ON"]
    B --> C["Power Reset"]
    C --> D["Static pressure compensation mode is set"]

    E["Static pressure compensation mode cancellation method"] --> F["DIP switch OFF"]
    F --> G["Power Reset"]
    G --> H["Static pressure compensation mode is cancelled"]

DIP Switch Settings

ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Warning : Please reset Main PCB before starting this function

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 LED of 7-segment indicates error number, 3rd LED indicates unit number.

Ex) 211 : No. 21 error of outdoor unit 011 → 051 : No. 105 error of outdoor unit

* 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
Outdoor unit related error	2 1	1		Outdoor unit Inverter Compressor IPM Fault	Outdoor unit Inverter Compressor Drive IPM Fault
	2 2	1		Inverter Board Input Over Current(RMS) of Outdoor Unit	Outdoor unit Inverter Board Input Current excess (RMS)
	2 3	1		Outdoor unit Inverter Compressor DC link Low Voltage	DC charging is not performed at Outdoor unit after starting relay turn on.
	2 4	1		Outdoor unit High Pressure Switch	System is turned off by Outdoor unit high pressure switch.
Display Title				Cause of Error
Outdoor unit related error	2 5	1		Outdoor unit Input Voltage High/ Low Voltage	Outdoor unit input voltage is over 487V or below 270V
	2 6	1		Outdoor unit Inverter Compressor Start Failure	The First Start Failure by Outdoor unit Inverter Compressor Abnormality
	2 8	1		Outdoor unit Inverter DC link High Voltage	System is turned off by Outdoor unit DC Voltage Over Charging
	2 9	1		Outdoor unit Inverter Compressor Over Current	Outdoor unit Inverter Compressor Fault OR Drive Fault
	3 0	1		Outdoor unit Constant Speed Compressor2 High Discharge Temperature	System is turned off by Outdoor Uunit Constant Speed Compressor2 High Discharge Temperature
	3 2	1		Outdoor unit Inverter Compressor High Discharge Temperature	System is turned off by Outdoor unit Inverter Compressor High Discharge Temperature
	3 3	1		Outdoor unit Constant Speed Compressor1 High Discharge Temperature	System is turned off by Outdoor Uunit Constant Speed Compressor1 High Discharge Temperature
	3 4	1		High Pressure of Outdoor Unit	System is turned off by excessive increase of high pressure of Outdoor unit
	3 5	1		Low Pressure of Outdoor unit	System is turned off by excessive decrease of low pressure of Outdoor unit
	3 6	1		Outdoor unit Low Condensing Ratio Limited	Outdoor unit stayed under low condensing limit for 3 minutes
	4 0	1		Outdoor unit Inverter Compressor CT Sensor Fault	Outdoor unit Inverter Compressor CT Sensor open or short
	4 1	1		Outdoor unit Inverter Compressor Discharge Temperature Sensor Fault	Outdoor unit Inverter Compressor Discharge Temperature Sensor open or short
	4 2	1		Outdoor unit Low Pressure Sensor Fault	Outdoor unit Low Pressure Sensor open or short
	4 3	1		Outdoor unit High Pressure Sensor Fault	Outdoor unit High Pressure Sensor open or short
	4 4	1		Outdoor unit Air Temperature Sensor Fault	Outdoor unit Air Temperature Sensor open or short
	4 5	1		Outdoor unit Heat Exchanger Temperature Sensor (Front side) Fault	Outdoor unit Heat Exchanger Temperature Sensor(Front side) open or short
	4 6	1		Outdoor unit Suction Temperature Sensor Fault	Outdoor unit Suction Temperature Sensor open or short
	4 7	1		Outdoor unit Constant Speed Compressor1 Discharge Temperature Sensor Fault	Outdoor unit Constant Speed Compressor1 Discharge Temperature Sensor open or short
	4 8	1		Outdoor unit Constant Speed Compressor2 Discharge Temperature Sensor Fault	Outdoor unit Constant Speed Compressor 2 Discharge Temperature Sensor open or short
Display Title Cause of Error
Outdoor unit related error	4 9	1		Outdoor unit Faulty IPM Temperature Sensor	Outdoor unit IPM Temperature Sensor short/open
	5 0	1		Omitting connection of R, S, T power of Outdoor unit	Omitting connection of outdoor unit
	5 1	1		Excessive capacity of indoor units Excessive connection of indoor units compared to capacity of Outdoor Unit
	5 2	1		Transmission error : inverter PCB → Main PCB	Failing to receive inverter signal at main PCB of Outdoor unit
	5 3	1		Transmission error : indoor unit → main PCB of Outdoor Unit	Failing to receive indoor unit signal at main PCB of Outdoor Unit .
	5 4	1		Reverse connection of R, S, T power of Outdoor unit	Reverse connection or omitting connection of R, S, T power of Outdoor unit
	5 7	1		Outdoor unit Communication Error with Inverter Controller	Outdoor unit Controller part cannot receive inverter control signals (usually happens after on-boarding)
	6 0	1		Inverter PCB EEPROM Error of Outdoor Unit	Access Error of Inverter PCB of Outdoor unit
	6 7	1		Outdoor unit Fan Lock Restriction of Outdoor unit
	6 9	1		Constant1 CT Sensor Error of Outdoor Unit	Constant1 CT Sensor open or short of Outdoor unit
	7 0	1		Constant2 CT Sensor Error of Outdoor Unit	Constant2 CT Sensor open or short of Outdoor unit
	7 3	1		Instant Over Current(Peak) of Outdoor unit PFC	Instant Over Current(Peak) of Outdoor unit PFC
	7 5	1		Outdoor unit Fan CT Sensor Error Outdoor unit Fan CT Sensor open or short
	7 6	1		Outdoor unit Fan DC Link High Voltage Error	Outdoor unit Fan DC Link High Voltage Error
	7 7	1		Outdoor unit Fan Over Current Error Outdoor unit Fan Current is over 5A
	7 9	1		Outdoor unit Fan Start Failure Error Outdoor unit Fan First Position Sensing Failure
	8 6	1		Outdoor unit Main PCB EEPROM Error	Communication Fail Between Outdoor unit Main MICOM and EEPROM or omitting EEPROM
	8 7	1		Outdoor unit Fan PCB EEPROM Error	Communication Fail Between Outdoor unit Fan MICOM and EEPROM or omitting EEPROM

	Display Title				Cause of Error
Outdoor unit related error	1 0	4 1			Communication Error Between Outdoor unit and Other Outdoor Unit	Failing to receive Slave Unit signal at main PCB of Outdoor unit
	1 0	5 1			Outdoor unit Fan PCB Communication Error	Failing to receive fan signal at main PCB of unit.
	1 0	6 1	Outdoor		unit FAN IPM Fault Error Instant Over Current at Outdoor unit Fan IPM
	1 0	7 1			Outdoor unit Fan DC Link Low Voltage Error	Outdoor unit Fan DC Link Input Voltage is under 380V
	1 1	3 1			Outdoor unit Liquid pipe Temperature Sensor Error	Liquid pipe temperature sensor of Outdoor unit is open or short
	1 1	5 1			Outdoor unit Subcooling Outlet Temperature Sensor Error	Outdoor unit Subcooling Outlet Temperature Sensor open or short
	1 5	1 1			Failure of operation mode conversion at Outdoor Unit	Pressure unbalance between Outdoor Units
	1 7	3 1			Outdoor unit Constant Speed Compressor Fault	Comp locking, Check Valve leakage, comp dielectric break down at Outdoor Unit
	1 7	4 1			Outdoor unit rated speed 2 condenser over-current	Outdoor unit rated speed 2 condenser burned / locked or fault by over-current
	1 9	0 1			Excessive increase of outdoor unit Inverter PCB Heat sink Temperature	Outdoor unit Inverter PCB Heat sink temperature is over 95°C
	1 9	1 1			Outdoor unit Inverter PCB Heat sink Temperature sensor error	Outdoor unit Inverter PCB Heat sink temperature sensor open or short
	1 9	3 1			Excessive increase of Outdoor unit Fan PCB Heat Sink Temperature	Outdoor unit Fan Inverter PCB Temperature is Over 95°C
	1 9	4 1			Outdoor unit Fan PCB Heat Sink Temperature Sensor Error	Outdoor unit Fan PCB Heat Sink Temperature Sensor open or short

New Function

■ Multi V III provides as following new functions.

New Function Applied item
Cool/Heat selector (PRDSBM)	Cooling/ Heating/ FanCooling/ Heating/ All OFF	ODUSolution Accessory
ODU Dry contact (PQDSBDCVM0)	Demand control-. Low load operation-. DDC control (DC0~10V Input)	ODUSolution Accessory
	ODU Fan Low speed control(Night low noise operation)
	Error alarm
Independent Power module Independent power module Solution Accessory ('11.11 available)

* If you want to get more details, refer to each installation Manuals.

■ Out Feature

- Cool/ Heat Selector

graph TD
    A["输入"] --> B["处理模块"]
    B --> C["输出"]
    D["输入"] --> E["处理模块"]
    E --> F["输出"]

- ODU Dry contact

Top-down schematic of an electronic device casing with various components and connectors (no text or labels)

1 Cool/ Heat selector

1.1 Cool/ Heat Selector has provided two different functions.

• Cooling/ heating/ Fan lock mode
• Cooling/ heating/ All OFF mode

[Installation]

1. Check the contents of Cool/ Heat Selector

Close-up of a device panel with four icons and a central connection line (no readable text or symbols)

Simple diagram of a rectangular device with a label 'LG' above it, no text or symbols inside the main frame.

1. Connect Outdoor Main PCB and Cool/ Heat Selector.

- Connect terminals on the back side of Cool/Heat Selector to terminal of Outdoor as show

GND GND shows field wiring connected wiring 1 2 3 4 1 2 3 4 Push Button - Insert wire method - Push arrow direction. Insert wire to connector.

* Communication line length can be maximum 300m, use communication line as thick as 1.25mm ^2 .

1.2 ODU Dry contact

ODU Dry contact has provided Three different functions.

• Demand control
• Night Low Noise control
• Error Alarm Monitoring function

[ODU Dry contact]

- Feature and Parts Naming

1 2 3 4 5 15 14 13 12 6 7 8 91011

1. SWDIP : Switch to select main function
2. SW_Address2 : Switch to set a upper address of the outdoor unit
3. SW_Address1 : Switch to set a lower address of the outdoor unit
4. SW_STEP : Switch to select a control mode.
5. CN_PWR : DC Input terminal
6. ERROR : Error display with relay contact
7. BUS-A : RS-485 (+) Terminal
8. BUS-B : RS-485 (-) Terminal
9. CN_CAPACITY : Signal input terminal to control a capacity of outdoor unit
10. CN_SPEED/CAP : Signal input terminal for Analog Input/Low noise operation
11. CN_OUT : Outdoor unit connector
12. LED1 : Display LED for RS-485 status
13. LED01G,02G,03G : Display LED for communication status
14. CN_JIG : Connector for writing program
15. SW1 : Reset switch

- Installation

1. ODU Dry contact single installation : Connect with ODU both single Unit and Series.

graph TD
    A["RS-485"] --> B["BUS_A"]
    A --> C["BUS_B"]
    B --> D["Computer 1"]
    C --> E["Computer 2"]
    D --> F["Heat Exchangers"]
    E --> G["Heat Exchangers"]
    F --> H["Output"]
    G --> H
    style A fill:#f9f,stroke:#333
    style H fill:#bbf,stroke:#333

1. ODU Dry contact with Central controller

: With Single Outdoor unit

CN_OUT TTL Multi-V WIRE ASSY 1(1EA)

: With Series Outdoor units

graph TD
    A["Central Control Devices"] -->|BUS_A| B["WIRE ASSY 1(1EA)"]
    A -->|BUS_B| C["WIRE ASSY 1(1EA)"]
    D["CN_OUT"] -->|TTL| C
    style A fill:#f9f,stroke:#333
    style D fill:#ccf,stroke:#333
    style B fill:#cfc,stroke:#333
    style C fill:#fcc,stroke:#333
    style D fill:#cff,stroke:#333

2. New Dry contact

2.1 Demand Control

ODU Dry contact has provided Two different methods for Demand control

- Using Contact signal

: High/ Low pressure value s are changed by setting value of Rotary S/W

- Using Analog signal with DDC Module

: High/ Low pressure value s are changed by setting value of DDC Module.(DC 0\~10V)

[Rotary S/W setting]

SW_STEP Input Signal

0, 1, 2, 3, 4, 5, 6 Contact signal

D, E Analog signal

[Setting]

SW_STEP Using Contact signal Using Analog signal with DDC Module

- Each connecting methods

1. Using Contact signal

SW VOLT2 SW VOLT1 Notes Do not input the voltage signal in NON VOLT* setting mode otherwise will cause serious damage LG does not supply this section (Field supply)

SW_VOLT2 SW_VOLT1 Connect separate External voltage of DC12V Input 3 input 2 Input 1 LGI does not supply this section (Field supply)

2. Using Analog signal with DDC Module

SW_VOLT2 SW_VOLT1 DC 0~10V Input GND Direct Digital Controller

[Control Value]

- Using Contact signal

Rotary S/W	Volt	Cooling Heating
		Step Control Step Control
D	0 0 Not-Control 0				Not-Control
	1 1 100% 0 100%
	2 2 90% 0 90%
	3 3 80% 0 80%
	4 4 70%		0 0 70%
	5 5 60% 0 60%
	6 6 50% 0 50%
	7 7 45% 0 45%
	8 8 40% 0 40%
	9 9	Comp	OFF 0	Comp	OFF
	10	10	All OFF	0	All OFF

Rotary S/W	Volt	Cooling Heating
		Step Control Step Control
E	0 9	Comp	OFF	0	Comp OFF
	1 8 40%	0 40%
	2 7 45%	0 45%
	3 6 52%	0 50%
	4 5 60%		0 0	60%
	5 4 70%	0 70%
	6 3 80%	0 80%
	7 2 90%	0 90%
	8 1 100%	0 100%
	9 1 100%	0 100%
	10	1 100%	0 100%

• Using Analog signal with DDC Module

SW_STEP	Input_1	Input_2	Input_3	Comp capacity Of outdoor unit(%)
0	0 0 0	No control
	1 0 0 70
	0 1 0 40
	0 0 1	COMP OFF
1	0 0 0	No control
	1 0 0 70
	0 1 0 50
	0 0 1	COMP OFF
2	0 0 0	No control
	1 0 0 80
	0 1 0 50
	0 0 1	COMP OFF
3	0 0 0	No control
	1	0	0	7
	0	1	0	4
	0	0	1 ALL	OFF
4	0 0 0	No control
	1	0	0	7
	0	1	0	5
	0	0	1 ALL	OFF
5	0 0 0	No control
	1	0	0	8
	0	1	0	5
	0	0	1 ALL	OFF
6	0 0 0	No control
	1	0	0	5
	0	1 0	COMP OFF
	0	0	1 ALL	OFF

2.2 Night Low Noise control

ODU Dry contact has provided Two methods for Night Low Noise Control

• Automatically operating
  : Using previous method
• Manual operating
  : Using simple switch and timer

[Setting]

- For ODU Dry contact

ON L1 2 3 4 Notes Default State is L1: ON, L2: ON Connect with S/W or Timer for Night Low Noise Control Position Function ON L1 2 3 4 ON : Master Mode OFF : Slave Mode ON : Enable Low Noise Operation OFF : Disable Low Noise Operation

• For Outdoor unit Refer to DIP S/W setting table

11.2.3 Error Alarm monitoring

ODU Dry contact has provided Error Alarm monitoring function

Notice for system fault information by buzzer or warning lamp.

Occurring fault is not only ODUs but also IDUs.

[Setting]

Field Supply Error Display Power AC or DC (Depends on Operation display power type)

- Note

AC Power : 3A @250V

DC Power : 3A @30Vv

3. Independent power module

The main PCB controls the EEV kit when the power is turn on.

The independent sub PCB controls the EEV kit when the power is turn off.

graph TD
    A["ODU"] -->|3 phase 400V, 1 phase 220V| B["Switch BOX"]
    B --> C["each room"]
    D["“If the power Cut-off, then product need to close EEV.”"] --> E["independent power module (option)"]
    E --> F["each room"]
    G["Concept of independent power module"] --> H["CN_EEV"]
    H --> I["EEV Operation signal"]
    I --> J["Each room"]
    K["Switch BOX"] --> L["each room"]
    M["Switch BOX"] --> N["Each room"]

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/m ^3 (R410A)

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

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 depending on piping length or piping diameter at customer = Total amount of replenished refrigerant in refrigerant facility (kg) + Amount of additionally replenished refrigerator 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.

(1) Without partition

Outdoor unit Indoor unit

(2) With partition and with opening which serve as passage of air to adjoining room

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)

(3) With partition and without opening which serve as passage of air to adjoining room

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

■ Calculate refrigerant concentration

$$ \frac {\text { Total amount of replenished refrigerant in refrigerant facility (kg) }}{\text { Capacity of smallest room where indoor unit is installed (m } ^ {3})} = \begin{array}{c} \text { Refrigerant concentration } \ | \quad (\mathrm{kg/m} ^ {3}) \ (\mathrm{R410A}) \end{array} $$

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

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

Installation guide at the seaside

CAUTION

1. Air conditioners should not be installed in areas where corrosive gases, such as acid or alkaline gas, are produced.
2. 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.
3. 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)

1) 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

2) In case, to install the outdoor unit on the seaside, set up a windbreak not to be exposed to the sea wind.

Windbreak Sea wind

3) Select a well-drained place.

• 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.

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

LG

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