ARUN50LL2 - Air-conditioner LG - Free user manual and instructions

USER MANUAL ARUN50LL2 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™ SPACE II

MODELS: ARUV Series

ARUN

[Non-Text]

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 ....17

Electrical Wiring 35

Test Run 48

Caution For Refrigerant Leak....56

Installation guide at the seaside....58

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 and 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 typhoons and other strong winds and earthquakes 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 differnet refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the unit may be gamaged.

Ventilate before operating air conditioner when gas goes out.

- It may cause explosion, fire, and burn.

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 installed securely, dust or water may enter the outdoor unit and fire or electric shock may result.

If the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant concentration from exceeding the safety limit when the refrigerant leaks.

- Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceeded. Should the refrigerant leak and cause the safety limit to be exceeded, harzards due to lack of oxygen in the room could result.

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 grill 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 will be 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 is not 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, and 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.

Do not operate with "System louver" closed.

- It may cause failure of appliance or accident.

Be very careful about product transportation.

• Only one person should not carry the product if it weighs more than 20kg .
• 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 mails and other metal or wooden parts, may cause stabs or other injuries.
• Tear apart and throw away plastic packaging bags so that children will 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 and 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 more than 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 board(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"]

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

    C --> X["Outdoor unit foundation work"]
    X --> Y["Installation of outdoor unit"]
    Y --> Z["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

CAUTION: Ratio of the connectable Indoor Units to the Outdoor: Within 50 \~ 130% Ratio of the running Indoor Units to the Outdoor: Within 10 \~ 100% A combination operation over 100% cause to reduce the total capacity.

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

■ Heat Pump

Model			ARUN50LR2ARUN50LL2	ARUN60LR2ARUN60LL2	ARUN80LR2ARUN80LL2
HP(Equivalent horsepower)			5	6	8
Chassis			UV	UV	UV
Refrigerant	Product charge kg		5.2	5.2	6.4
	CF(Correction Factor)	kg	0	0	0
Max. Connectable No. of Indoor Units			8	9	13
Net Weight kg			200	200	200
Dimensions (WxHxD)		mm	750x1,790x650	750x1,790x650	750x1,790x650
		inch	29.5x70.5x25.6	29.5x70.5x25.6	29.5x70.5x25.6
Connecting Pipes	Liquid Pipes	[mm(inch)]	9.52(3/8)	9.52(3/8)	9.52(3/8)
	Gas Pipes	[mm(inch)]	15.88(5/8)	19.05(3/4)	19.05(3/4)

■ Cooling Only

Model			ARUV80LR2 ARUV100LR2ARUV80LL2 ARUV100LL2
HP(Equivalent horsepower)			8	10
Chassis			UV1 UV
Refrigerant	Product charge kg		4.5 5.1
	CF(Correction Factor)	kg	0	0
Max. Connectable No. of Indoor Units			13 16
Net Weight kg			175 190
Dimensions (WxHxD)		mm	750 x 1,790 x 495 750x1,790x650
		inch	29.5 x 70.5 x 19.5 29.5x70.5x25.6
Connecting Pipes	Liquid Pipes	[mm(inch)]	9.52(3/8) 9.52(3/8)
	Gas Pipes	[mm(inch)]	19.05(3/4) 22.2(7/8)

Connectable Indoor Unit

MULTI V. SPACE should be connected with "2 series" indoor unit only.

Ex) ARNU07GSEA2

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 environmental-friendly refrigerant and encouraged to use it widely to prevent environmental 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 up pipes more than its necessity 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 the 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 leak 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.

1. 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 (neare beach, coast, lake, etc).

(Ex) Rooftop where sunshine always shines.

1. Performance of heating will be reduced and preheat time of the indoor unit may be lengthened in case of installing the outdoor unit in winter at following location:

(1) Shade position with a narrow space
(2) Location with much moisture in neighboring floor.
(3) Location with much humidity around.
(4) Location where water gathers since the floor is not even.

Installation Space

- Space for the "*" display part of by type of system louver

When installing automatic louver: 150

When installing manual louver: 150

When installing fixed louver: 100 (Basic space)

- Please install the product so that the door of the outdoor unit room is completely opened for smooth installation and service.

Drain hole Drain pipe

- A water drain outlet is required to discharge rain water on the bottom of the outdoor unit room or condensation water to possibly generate when operating.

• The recommended Specification of louver

660mm 550mm970mm 85mm

Diagram showing a blue corrugated structure connected to a black circular element, with two parallel lines of curved arrows indicating flow or direction (no text or symbols)

Pure diagram of a circular structure with internal lines and arrows, no text or symbols present

CAUTION:

Do not use bended louver like the above Fig. It disturbs the air circulation.

- Multi V Space should be installed in the special outdoor room with soundproofing walls.

Recommended Effective Opening Ratio(E.O.R) of Louver

ho = h * COSθ Total Area(A) = H * W Effective Area(Af) = ho * W * N Opening Ratio(n) = Af/A → Af = A * n h W H N

$$ \mathrm{E.O.R} (\%) = \frac {\mathrm{Af}}{\mathrm{Ad} + \mathrm{As}} \times 100 $$

Air Flow Rate Q = Discharge Area(Ad) * Discharge air velocity Air Flow Rate Q = Suction Area(As) * Suction air velocity

E.O.R > 120%

Cautions in winter especially for seasonal wind

• Sufficient measures are required at 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 area.
  • 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.
• Don't install the suction hole and discharge hole of the outdoor unit facing to the seasonal wind.

Lifting method

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

A 40° or less B Rope suspension point

WARNING

CAUTION

Be very careful to carry 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 of it.
• Use 2 belts of at least 8 ~m long.
• Place extra cloth or boards in the locations where the casing comes in contact with the sling to prevent damage.
• Hoist the unit making sure it is being lifted at its center of gravity.

Installation

Location of anchor bolt

■ Installation foot (Location of anchor bolt)

T23 UV: 516 UV1: 362

(Unit : mm)

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 (Anti-vibration pad) fully (The base pad shall be more than 200mm).

Technical diagram showing a mechanical assembly with labeled components and directional arrows indicating motion or force.

Spring washer Frame H-Beam Nut 100 75 200

Anti-vibration materials Concrete base 75 Four bolt are required 3 thread ridges 200

Foundation bolt executing method

Technical diagram showing labeled components of a structural assembly with numbered parts

Ⓐ Ensure that the corner part can be securely mounted. Otherwise, the support for installation may be bent.
⑧ Obtain and use the M10 anchor bolt.
© The corner was not properly mounted.
Outdoor unit (Insert the cushion pad between outdoor unit and base support to ensure that anti-vibration may be done in a wide area)
E Pipe and wiring space (in case of piping and wiring on the floor surface)
F H-Beam support
G Concrete base support

WARNING

• Be sure to install unit in a place strong enough to withstand its weight.
  Any lack of strength may cause unit to fall down, resulting in a personal injury.
• Have installation work in order to protect against a strong wind and earthquake. Any installation deficiency may cause unit to fall down, resulting in a personal injury.
• Especially take care for support strength of the floor surface, water drain processing (processing of water flown out from the outdoor unit during operation) and paths of the pipe and wiring when making a base support.
• Don't use a tube or pipe for water drain in the base pan and perform water drain processing by using the drain path. Water drain may not be done due to freezing of a tube or pipe.

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 " (mm)
	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	0.8~1.0 0.5~0.8
<22.4(76,400)	3/4" 3/8" 1	1.0~1.3 0.5~0.8

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

4) Check

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

Copper tube 90° Slanted Uneven Rough

Pipe Reamer Point down

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

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

FLARE SHAPE and FLARE NUT TIGHTENING TORQUE

Precautions when connecting pipes

• See the following table for flare part machining dimensions.
- When connecting the flare nuts, apply refrigerant oil to the inside and outside of the flares and turn them three or four times at first. (Use ester oil or ether oil.)
- See the following table for tightening torque.(Applying too much torque may cause the flares to crack.)
• After all the piping has been connected, use nitrogen to perform a gas leak check.

pipe size tightening torque(N ·m) A(mm) flare shape
∅9.5 3.27~3.99	12.8~13.2
∅12.7 4.95~6.30	16.2~16.6
∅15.9 6.18~7.54	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
∅22.2	27-33 36~44	Hexagonal wrench 10mm				22~28-
∅25.4

HEAT INSULATION

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

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

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

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

Refrigerant piping installation

WARNING

Always use extreme care to prevent the refrigerant gas (R410A) from leakage while using fire or flame. If the refrigerant gas comes in contact with the flame from any source, such as a gas stove, it breaks down and generates a poisonous gas which can cause gas poisoning. Never perform brazing in an unventilated room. Always conduct an inspection for gas leakage after installation of the refrigerant piping has been completed.

Cautions in pipe connection/valve operation

Mechanical assembly diagram showing a cylindrical component with two adjustment knobs and a directional arrow (no text or labels)

Open status when both the pipe and the valve are in a straight line.

Cut both the pipe and the valve with a cutter to suit the length (Don't cut the length of less than 70mm) CLOSE OPEN

WARNING

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

① Pipe joint (auxiliary parts): Securely perform brazing with a nitrogen blow into the service valve port.(Releasing pressure : 0.02 MPa or less)
② Flare nut: Loose or tighten flare nut by using the wrench with both ends. Coat the flare connection part with oil for the compressor.
③ Cap: Remove caps and operate valve, etc. After operation, always reattach caps (tightening torque of valve cap: 25N·m (250kgf·cm) or more). (Don't remove the internal part of the port)
④ Service port: Make the refrigerant pipe vacuum and charge it using the service port. Always reattach caps after completing work (tightening torque of service cap: 14N·m (140kgf·cm) or more).
⑤ Liquid pipe
⑥ Gas pipe

Technical drawing of a mechanical assembly with numbered components and dimension annotations

Ball Valve(Liquid Pipe)
Ball Valve(Gas Pipe)
≥22.2:brazing type
≤19.05: flare type

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	9.52	12.7	15.88	19.05	22.2	25.4	28.58	31.8	34.9	38.1	41.3
Minimum thickness [mm]	0.8	0.8	0.8	0.99	0.99	0.99	0.99	0.99	1.1	1.21	1.35	1.43

1. 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 ARBLN	03321 ARBL054 ARBL057 ARBL1010

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
    A["Group 1"] --> B["No Symbol"]
    C["Group 2"] --> B
    D["Group 3"] --> B
    E["Group 4"] --> B
    F["Group 5"] --> B
    G["Group 6"] --> B
    H["Group 7"] --> B
    I["Group 8"] --> B
    J["Group 9"] --> B
    K["Group 10"] --> B
    L["Group 11"] --> B
    M["Group 12"] --> B
    N["Group 13"] --> B
    O["Group 14"] --> B
    P["Group 15"] --> B
    Q["Group 16"] --> B
    R["Group 17"] --> B
    S["Group 18"] --> B
    T["Group 19"] --> B
    U["Group 20"] --> B
    V["Group 21"] --> B
    W["Group 22"] --> B
    X["Group 23"] --> B
    Y["Group 24"] --> B
    Z["Group 25"] --> B
    AA["Group 26"] --> B
    AB["Group 27"] --> B
    AC["Group 28"] --> B
    AD["Group 29"] --> B
    AE["Group 30"] --> B
    AF["Group 31"] --> B
    AG["Group 32"] --> B
    AH["Group 33"] --> B
    AI["Group 34"] --> B
    AJ["Group 35"] --> B
    AK["Group 36"] --> B
    AL["Group 37"] --> B
    AM["Group 38"] --> B
    AN["Group 39"] --> B
    AO["Group 40"] --> B
    AP["Group 41"] --> B
    AQ["Group 42"] --> B
    AR["Group 43"] --> B
    AS["Group 44"] --> B
    AT["Group 45"] --> B
    AU["Group 46"] --> B
    AV["Group 47"] --> B
    AW["Group 48"] --> B
    AX["Group 49"] --> B
    AY["Group 50"] --> B

Ⓐ 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 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.

1 2 3 4 5 6

1 Refrigerant piping 4 Taping
2 Pipe to be brazed 5 Valve
3 Nitrogen 6 Pressure-reducing valve

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.

Do not use anti-oxidants when brazing the pipe joints. Residue can clog pipes and break equipment.

Selection of Refrigerant Piping

graph TD
    A["Main pipe"] -->|①| B["Outdoor unit"]
    A -->|②| C["Branching pipe ②"]
    C --> D["Branching pipe ②"]
    C --> E["Indoor unit"]
    B --> F["Gas pipe"]
    B --> G["Liquid pipe"]
    C --> H["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:#ffc,stroke:#333
    style H fill:#ffc,stroke:#333

	Piping partsNo.		Selection of pipe sizeName
1	Outdoor unit↓1st branching section	Main pipe	Size of main pipe
			Outdoor unit capacity type	Liquid pipe Gas pipe[mm(inch)] [mm(inch)]
			5HP ∅9.52(3/8) ∅	15.88(5/8)
			6, 8HP ∅9.52(3/8) ∅	19.05(3/4)
			10HP ∅9.52(3/8) ∅	22.2(7/8)
2	Branching section↓Branching section	Branching pipe	Pipe size of between branching sections
			Indoor unit capacity[kW(Btu/h)]	Liquid pipe Gas pipe[mm(inch)] [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)
3	Branching section↓Indoor unit	Indoor unit connecting pipe	Connecting pipe size of indoor unit
			Indoor unit capacity[kW(Btu/h)]	Liquid pipe Gas pipe[mm(inch)] [mm(inch)]
			≤5.6(19,100) ∅6.35(1/4) ∅12.7(1/2)
			<16.0(54,000) ∅9.52(3/8) ∅15.88(5/8)

Refrigerant piping system

◆ Y branch method

Example : 5 Indoor Units connected

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

H 50m L150m l 40m a b c d e h 15m ① ② ③ ④ ⑤

Total pipe length = A+B+C+D+a+b+c+d+e ≤ 300m

L	Longest pipe length * Equivalent	pipe length
	A+B+C+D+e ≤ 150m A+B+C+D+e ≤ 175m
l	Longest pipe length after 1st branch
	B+C+D+e ≤ 40m
H	Difference in height(Outdoor Unit ↔ Indoor Unit)
	H ≤ 50m(40m:Outdoor unit is lower than Indoor Units)**
h	Difference in height (Indoor Unit ↔ Indoor Unit)
	h ≤ 15m

• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, calculation purpose

- **: Indoor Unit should be installed at lower position than the header

◆ Header Method

Example : 6 Indoor Units connected

Ⓐ : Outdoor Unit
⑧ : 1st branch
©: Indoor Units
(D): Sealed piping

H 50m L 150m l 40m a b c d e f h 15m C 2 C 3 C 4 C 5 C

Branch pipe can not be used after header

Total pipe length = A+a+b+c+d+e+f ≤ 300m

L	Longest pipe length * Equivalent	pipe length
	A+f ≤ 150m A+f ≤ 175m
l	Longest pipe length after 1st branch
	f ≤ 40m
H	Difference in height(Outdoor Unit ↔ Indoor Unit)
	H ≤ 50m(40m:Outdoor unit is lower than Indoor Units)**
h	Difference in height (Indoor Unit ↔ Indoor Unit)
	h ≤ 15m

WARNING

Pipe length after header branching (a\~f)

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

Performance difference between Indoor Units may occur.

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

◆ Combination of Y branch/header method

Example : 5 Indoor Units connected

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

graph TD
    A["Component A"] --> B["Component B"]
    B --> C["Component C"]
    C --> D["Component D"]
    D --> E["Component E"]
    E --> F["Component F"]
    F --> G["Component G"]
    G --> H["Component H"]
    H --> I["Component I"]
    I --> J["Component J"]
    J --> K["Component K"]
    K --> L["Component L"]
    L --> M["Component M"]
    M --> N["Component N"]
    N --> O["Component O"]
    O --> P["Component P"]
    P --> Q["Component Q"]
    Q --> R["Component R"]
    R --> S["Component S"]
    S --> T["Component T"]
    T --> U["Component U"]
    U --> V["Component V"]
    V --> W["Component W"]
    W --> X["Component X"]
    X --> Y["Component Y"]
    Y --> Z["Component Z"]
    Z --> AA["Component AA"]
    AA --> AB["Component AB"]
    AB --> AC["Component AC"]
    AC --> AD["Component AD"]
    AD --> AE["Component AE"]
    AE --> AF["Component AF"]
    AF --> AG["Component AG"]

Branch pipe can not be used after header

☐ 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(54,600) ∅9.52(3/8)	∅15.88(5/8)
<22.4(76,400) ∅9.52(3/8)	∅19.05(3/4)
<33(112,600) ∅9.52(3/8)	∅22.2(7/8)

Total pipe length = A+B+C+a+b+c+d+e ≤ 300m

L	Longest pipe length * Equivalent pipe length
	A+B+b ≤ 150m A+B+b ≤ 175m
l	Longest pipe length after 1st branch
	B+b ≤ 40m
H	Difference in height(Outdoor Unit ↔ Indoor Unit)
	H ≤ 50m(40m:Outdoor unit is lower than Indoor Units)**
h	Difference in height (Indoor Unit ↔ Indoor Unit)
	h ≤ 15m

• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, calculation purpose

• ** : Indoor Unit should be installed at lower position than the header

◆ The Amount of Refrigerant

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

A

Product Charge
ARUN50LL2(R2) = 5.2kg
ARUN60LL2(R2) = 5.2kg
ARUN80LL2(R2) = 6.4 kg
ARUV80LL2(R2) = 4.5kg
ARUV100LL2(R2) = 5.1kg 

B

Additional charge (kg)

= Total liquid pipe (m): Ø22.2mm x 0.354(kg/m) + Total liquid pipe (m): Ø19.05mm x 0.266(kg/m) + Total liquid pipe (m): Ø15.88mm x 0.173(kg/m) + Total liquid pipe (m): Ø12.7mm x 0.118(kg/m) + Total liquid pipe (m): Ø9.52mm x 0.061(kg/m) + Total liquid pipe (m): Ø6.35mm x 0.022(kg/m) + CF(kg) (Correction Factor) Total amount(kg) = Ⓐ + Ⓑ

Ex A B C d e 3 (B B) 4 1 (B) 2 (B) A Outdoor Unit a : ø6.35, 10m B Indoor Unit b : ø6.35, 10m A : ø9.52, 40m c : ø6.35, 10m B : ø9.52, 20m d : ø6.35, 10m C : ø9.52, 20m e : ø6.35, 10m Additional Charge = A x 0.061 + B x 0.061 + C x 0.061 + (a+b+c+d+e) x 0.022 + CF = 40 x 0.061 + 20 x 0.061 + 20 x 0.061 + (10 x 5) x 0.022 - 0 (CF) = 5.98(kg)

CAUTION If a negative result is obtained from the calculation, no refrigerant needs to be added.

◆ Special condition

In case of the No. of CST TQ/TR/RAC SE/ARTCOOL SF models are over than 50% of the connected indoor units when the total No. of connected indoor units are over than 50% of the max. connectable indoor units.

$$ \boxed {\text { Total amount(kg) }} = \boxed {\mathbf {A}} + \boxed {\mathbf {B}} + \boxed {\mathbf {C}} $$

■ Additional refrigerant charging amount (kg) : ©

$$ = (A \times \alpha + B \times \beta) - (A V G \times \beta) $$

• A = Total No. of TQ, TR, SE and SF Indoor units, = 0.5
• B = Total No. of except TE, SE and SF Indoor units, β = 0.3
- AVG = 50% of Max. No. of connectable Indoor units.

Example)

1) Installation Information

• Outdoor unit : 6HP
• Total indoor units : 6 units (TQ 3 units, SE 2 units, BH 1 unit)

2) Information from PDB

• Max. No. of connectable indoor units : 9 units
• Calculated additional refrigerant amount = 2 kg : Ⓑ

3) Indoor refrigerant charging amount

$$ = (5 \text { units } x 0. 5 + 1 \text { unit } x 0. 3) - (5 \text { units } x 0. 3) = 1. 3 \text { kg }: Ⓒ $$

▶ Revised the total additional charging amount = Ⓑ + Ⓒ = 2 kg + 1.3 kg = 3.3 kg

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

≤ 0.44 (kg/m ^3 )

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

☐ 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

Distribution Method

1. Line Distribution

graph TD
    A["Server 1"] -->|1st| B["Main pipe Distribution"]
    A -->|2nd| C["Main pipe Distribution"]
    A -->|3rd| D["Main pipe Distribution"]
    B --> E["Main pipe Distribution"]
    C --> F["Main pipe Distribution"]
    D --> G["Main pipe Distribution"]

graph TD
    A["Server"] --> B["1st"]
    B --> C["2nd"]
    C --> D["3rd"]
    D --> E["3rd main pipe distribution"]
    style A fill:#f9f,stroke:#333
    style D fill:#bbf,stroke:#333

2. Vertical Distribution

Ensure that the branch pipes are attached vertically.

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

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

3. The others

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

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
B 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

■ Header A B

Ⓐ To outdoor unit
⑧ 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.

Technical line drawing of a mechanical component with a cylindrical shaft and flange (no text or symbols)

- When the number of indoor units to be connected to the branch pipes is less than the number of branch pipes available for connection then cap pipes should be fitted to the surplus branches.

B Pinched pipe

- Fit branch pipe lie in a horizontal plane.

Horizontal plane

View from point B in the direction of the arrow

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

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

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

Insulator Tape Insulator of field pipe

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

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

Selection of Y Branch and Header

1. Y Branch

[unit:mm]

Models Gas pipe Liquid pipe
ARBLN01621
ARBLN03321
ARBLN07121
ARBLN14521

* For example. Indicated ∅9.52 is the outer diameter(O.D..) of field jointed piping

2. 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

(1) Leak test

Leak test should be made by pressurizing nitrogen gas to 3.8 MPa(38.7kgf/cm ^3 ). 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.

During this test, set DIP switch as Vacuum Mode.

Nitrogen gas cylinder Liquide pipe Gas pipe

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

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

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

24 hour later: 3.73 MPa, 20°C

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

And hence there is no leakage in pipe occurred.

CAUTION

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

Usually the cylinder is used in a vertical standing position.

(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. Vaccum of the pipe and the indoor units should be made from the port of the outdoor unit's service valve with the service valve closed.

* Never perform air purging using refrigerant.

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

1) Evacuate the system from the liquid and gas pipes with a vacuum pump for over 2 hrs and bring the system to -100.7kPa.

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

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

(Rainwater may enter the pipe during work in the rainy season or over a long period of time) After evacuating the system for 2 hrs, give pressure to the system to 0.05MPa(vacuum break) with nitrogen gas and then evacuate it again with the vacuum pump for 1hr to -100.7kPa(vacuum drying). If the system cannot be evacuated to -100.7kPa within 2 hrs, repeat the steps of vacuum break and its drying. Finally, check if the vacuum gauge does not rise or not, after maintaining the system in vacuum for 1 hr.

Vacuum pump Liquide pipe Gas pipe

WARNING

• If the primary charging is not performed after vacuum, wet air may go into the outdoor unit. If air is mixed with the refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.
• Charging of refrigerant while the compressor is working is prohibited. Otherwise, liquid may go into the compressor. It may cause faults of the compressor.
• Use a gravimeter accurate to 0.1kg.
• If other refrigerants are mixed in the original refrigerant, a refrigerant cycle may cause malfunction or damage.
• Add accurate refrigerant quantity via calculation.
  Too much or too little refrigerant may cause problems
• Repeated on and off of the indoor units without charging refrigerant may cause faults of EEV.
• 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.

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

Vacuum mode setting method Vacuum mode cancellation method

Main PCB SW01S	ODU power reset	Master main PCB DIP switch OFF( No.11,14)
Main PCB SW02B	Master main PCB DIP switch ON ( No.11,14)	Power reset
Main PCB SW01V	Press the black button Main PCB (5 sec.)	Vacuum mode cancellation

Vacuum mode setting

ODU V/V OPEN

Main EEV, SC EEV OPEN

IDU EEV OPEN

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

A 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.A Liquid pipeB Gas pipeC Power linesD Finishing tapeE Insulating materialF Communication lines	Be sure to fully insulate connecting portion.A These parts are not insulated.
Good example	A Liquid pipeB Gas pipeC Power linesD Insulating materialE Communication lines

Penetrations

Inner wall (concealed)

Floor (fireproofing)

Technical diagram of a mechanical assembly with labeled components A through G

Outer wall

C D A B

Roof pipe shaft

Technical diagram showing labeled components A through G with directional arrows indicating flow or movement.

Outer wall (exposed)

Penetrating portion on fire limit and boundary wall

① ② A 1m 1m

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

When filling a gap with mortar, cover the penetration part with steel plate so that the insulation material will not be caved in. For this part, use incombustible materials for both insulation and covering.(Vinyl covering should not be used.)

Electrical Wiring

Areas of 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 electric engineers do 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 communication 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 put Outdoor Unit to earth. Do not connect earth line to any gas pipe, water pipe, lightening rod or telephone earth line. If earth is incomplete, it may cause an electric shock.

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 communication line. If connected, electrical parts will be burnt out.
3. Use 2-core shield cable for communication line.(O mark in the figure below) If communication 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 communication line specified should be connected to the terminal block for Outdoor Unit communication.

graph TD
    A["Outdoor Unit"] --> B["Indoor Unit"]
    C["Outdoor Unit"] --> D["Indoor Unit"]
    B --> E["Remote control"]
    D --> F["Remote control"]
    E --> G["Indoor Unit"]
    F --> H["Indoor Unit"]
    G --> I["Indoor Unit"]
    H --> J["Indoor Unit"]
    style G fill:#f9f,stroke:#333
    style H fill:#f9f,stroke:#333
    style I fill:#f9f,stroke:#333

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

2-Core Shield Cable Multi-Core Cable

CAUTION

• Use the 2-core shield cables for communication lines. Never use them together with power cables.
• 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.
• Keep power imbalance within 2% of the supply rating. Large imbalance will shorten the life of the smoothing capacitor.

Control box and connecting position of wiring

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

Front Panel

DIRECTION OF PIPING/WIRING

• Connect communication line between main and sub outdoor unit through the terminal block.
• Connect communication 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 communication 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.

Diode Inverter PCB Noise Filter FAN PCB Reactor Main PCB Terminal Block (3-Phase 4-wire power system)

CAUTION

The Power cord connected to the unit should be selected according to the following specifications.

Communication and Power Lines

1) Communication cable

• Types : shielding wire
• Use wires of size : over 1.25mm^2
  • Maximum allowable temperature: 60°C
  • Maximum allowable line length: under 300m

2) Remote control cable

- Types : 3-core cable

3) Simple central control cable

• Types : 4-core cable (Shielding wire)
• Use wires of size : over 0.75mm^2

4) Separation of communication and power lines

- If communication 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 communication 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.

CAUTION

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

◆ 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 mechanical or architectural component with two circular holes and a central arch (no text or symbols)

Simple diagram of a container with two circular objects inside, enclosed by a prohibition symbol (no text or labels)

Simple diagram of a container with liquid and two black circles inside, enclosed by a large gap symbol (no text or labels)

• 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.

◆ Example Connection of Communication Cable

1.50Hz

graph TD
    A["3 Phase 4 Wires Power supply 50Hz 380-415V (Main Switch)"] --> B["Power supply switch (Switch fuse: ELCB)"]
    C["Power supply 1 Phase 50Hz 220-240V"] --> D["Power supply switch (Switch)"]
    D --> E["3 Phase 4 Wires Power line(R, S, T, N)"]
    D --> F["Communication line (3 line): Wired remote control"]
    D --> G["Single Phase of power supply line(L, N)"]
    D --> H["Communication line (2 shield line): Between Indoor Unit and Outdoor Unit"]
    I["Pull Box(Installer Option)"] --> D

WARNING

• Indoor Unit ground Lines are required for preventing electrical shock accident in 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.

IDUSO DUTEENET DRY2 GND 12V B A B A The GND terminal is a '-' terminal for the central controller, not Ground Line

2.60Hz

graph TD
    A["Power supply 1 Phase 50Hz 220-240V"] --> B["Power supply switch (Switch)"]
    B --> C["3 Phase 4 Wires Power supply 60Hz 380V"]
    C --> D["Power supply switch (Switch fuse : ELCB)"]
    D --> E["3 Phase 4 Wires Power line(R, S, T, N)"]
    E --> F["Communication line (3 line): Wired remote control"]
    F --> G["Single Phase of power supply line(L, N)"]
    G --> H["Communication line (2 shield line): Between Indoor Unit and Outdoor Unit"]
    H --> I["Pull Box(Installer Option)"]

WARNING

• Indoor Unit ground Lines are required for preventing electrical shock accident in 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.

IDUSO DUTERNET DRY2 GND 12V B A B A The GND terminal is a '-' terminal or the central controller, not Ground Line

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

Diagram showing three Ethernet ports with labeled connectors and connection points

Location of setting Switch

■ Location of setting Switch

Main PCB

SW01B (DIP S/W) SW02B (DIP S/W) 8:8:6 7 - Segment SW02V Auto addressing SW01V Data confirm

- Checking according to dip switch setting

1. You can check the setting values of the 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 unit

The number is sequentially appeared at the 7 segment in 5 seconds after applying the power. This number represents the setting condition. & model code → total capacity → 2 → 25 → model type

1 \~255 : model code
② 6\~10HP : HP numbers
③ No display : cooling only 2 : heat pump
4 25 : normal
5 ARUV series : 70, ARUN series : 170

Model code Capacity [kW] Remarks
82	8	Cooling only
83 10
84	5
85 6 Heat pump
86	8

Example) ARUN60LL2(R2)

CAUTION

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

■ Setting the DIP switch (SW01B/SW02B)

- 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.

1. Settings of Master outdoor unit

Function	SW01B Setting	SW02B Setting	Remarks
Standard	1 2 3 4 5 6 7 8 9 10 11 12 13 14	14	Power reset is necessaryFactory Setting
Long Pipe Length	1 2 3 4 5 6 7	8 9 10 11 12 13 14	Power reset isNecessary- Cooling Target Pressure: Standard-39- Heating Target Pressure: Standard+131
Outdoor unit ESPCompensation(step 1)	1 2 3 4 5 6 7	8 9 10 11 12 13 14	Power reset isNecessary 40 ≤ ESP < 60Pa
Outdoor unit ESPCompensation(step 2)	1 2 3 4 5 6 7	8 9 10 11 12 13 14	Power reset isNecessary 60 ≤ ESP < 80Pa
Outdoor unit ESPCompensation(step 3)	1 2 3 4 5 6 7	8 9 10 11 12 13 14	Power reset isNecessary 80 ≤ ESP < 100Pa
Outdoor unit ESPCompensation(step 4)	1 2 3 4 5 6 7 8 9 10 11 12 13 14	14	Power reset isNecessary 100 ≤ ESP ≤ 120Pa
Low blowing Noise	1 2 3 4 5 6 7	8 9 10 11 12 13 14	Power reset isNecessary
Cool/Heat selector	1 2 3 4 5 6 7 8 9 10 11 12 13 14	14	ARUNseries onlyOptional device

* In long piping mode, power consumption will be increased.

Function	SW01B Setting	SW02B Setting	Remarks
Night Silent Operation	1 2 3 4 5 6 7	8 9 1 0 1 1 1 2	Power reset is NecessaryFan RPM down at on night time1 3 1 4
Pump Down	1 2 3 4 5 6 7	8 9 1 0 1 1 1 2	Power reset is NecessaryAll the refrigerant flows back into the ODU1 3 1 4
Forced Oil Return	1 2 3 4 5 6 7	8 9 1 0 1 1 1 2	Dip switch + Black button(SW01V)1 3 1 4
Vacuum Mode	1 2 3 4 5 6 7	8 9 1 0 1 1 1 2	During Vacuuming, Valves & EEV should be opened1 3 1 4
Pump Out	1 2 3 4 5 6 7	8 9 1 0 1 1 1 2	ARUN series only1 3 1 4
Snow	1 2 3 4 5 6 7	8 9 1 0 1 1 1 2	ARUN series onlyUsed when snow piles up On the ODU Fan.Fan operates periodically.1 3 1 4
Forced Defrosting	1 2 3 4 5 6 7	8 9 1 0 1 1 1 2	ARUN series onlyAccelerates defrost operation1 3 1 4

Note: Oil collecting operation is default function which operates after every six hours.
- To enable forced operation of this function change the dip switch setting. And after using, make sure to restore the dip switch setting.

Automatic Addressing

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

1) Wait for 3 minutes after applying power supply (main and sub outdoor unit, indoor unit).
2) Press the switch of the outdoor unit (SW02V) for 5 seconds.
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 indoor unit connection set.
5) Numbers of indoor unit connection set 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 indoor unit connection set.)

Main PCB SW01B (DIP S/W) SW02B (DIP S/W) 7 - Segment SW02V Auto addressing SW01V Data confirm

CAUTION

- In replacement of the indoor unit PCB, always perform auto address setting again. If power supply is not applied to the indoor unit, operation error occurs. Auto addressing is only possible on the main PCB Auto addressing has to be performed after 3 minutes to improve communication.

◆ The Procedure of Automatic Addressing

graph TD
    A["Power On"] --> B["Waiting 3 minutes"]
    B --> C["Press SW02V for 5 sec."]
    C --> D["7-segment LED = 88"]
    D --> E["Don't Press SW02V"]
    E --> F["Waiting about 2~7 minutes"]
    F --> G{7-segment LED = No. of IDUs}
    G -->|YES| H["OK"]
    G -->|NO Check the connections| I["of communication line"]
    I --> J["Auto addressing start"]
    J --> C
    G --> K["Indoor address number is displayed on wired remote control or indoor unit display window. It is not an error message, will disappeared when on/off button is pressed on remote control ex) Display of 01, 02, ..., 15 means connection of 15 indoor units and 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 communication lines connected to INTERNET terminal should be connected to central control of Outdoor until 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
Terminal block on the main PCB

graph TD
    A["SODU IDU INTERNET DRY1 DRY2"] --> B["B"]
    A --> A["A"]
    A --> B["B"]
    A --> A["A"]
    B --> C["B"]
    B --> D["A"]
    C --> E["B"]
    C --> F["A"]
    D --> G["B(D) A(C)"]
    E --> H["..."]
    F --> I["..."]
    G --> J["..."]
    H --> K["GND 12V"]
    I --> K

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/Heat Selector Installation and Connection

■ Using Cool/Heat 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.
  • Maximum communication line length for Cool/Heat Selector : 200m.
• Setting Main PCB Dip S/W of Master Outdoor Unit.

graph TD
    A["Outdoor Unit"] --> B["Mode Change"]
    B --> C["③"]
    B --> D["④"]
    B --> E["①"]
    B --> F["②"]
    B --> G["③"]
    B --> H["④"]
    B --> I["①"]
    B --> J["②"]
    B --> K["Back"]
    L["Fan"] --> M["Light Bulb"]
    N["Cooling"] --> O["Light Bulb"]
    P["Light Bulb"] --> Q["Light Bulb"]
    R["Light Bulb"] --> S["Light Bulb"]

■ 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 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 communication 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.

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^ )

CAUTION

Preheat of compressor

• Start preheat operation for 3 hours after supplying main power.
• In case that the outdoor temperature is low, be sure to supply power 6 hours before operation so that the heater is heated(insufficient heating may cause damage of the compressor.)

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

Night Silent Operation

■ ARUV series

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.

graph TD
    A["Max. RPM setting method"] --> B["Dip S/W No.12+14 ON"]
    B --> C["Main PCB Power Reset"]
    C --> D["Setting the Fan Max. RPM"]
    D --> E["Setting Complete"]
    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

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.

[Note]

1. Select appropriate RPM referencing noise table.

Step	Setting		Fan Max Black RRMn	Judgment (hr)	Operation (hr)
		Red button
	1 time1	1 time	450+ESP	8	9
	2 times2	1 time	400+ESP	8	9
	3 times3	1 time	350+ESP	8	9

ARUN series

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.

graph TD
    A["Max. RPM setting method"] --> B["Dip S/W No.12+14 ON"]
    B --> C["Main PCB Power Reset"]
    C --> D["Setting the Fan Max. RPM"]
    D --> E["Setting Complete"]
    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

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.

[Note]

1. Select appropriate RPM referencing noise table.

• ARUN50/60LL2(R2)

Step	Setting		Fan Max	Judgment (hr)	Operation (hr)
		Red button	Black button
1	1time	1time	380+ESP	8	9
2	2times	1time	380+ESP	6.5	10.5
3	3times	1time	380+ESP	5	12
4	4time	1time	340+ESP	8	9
5	5times	1time	340+ESP	6.5	10.5
6	6times	1time	340+ESP	5	12
7	7times	1time	300+ESP	8	9
8	8times	1time	300+ESP	6.5	10.5
9	9times	1time	300+ESP	5	12

• ARUN80LL2(R2)

Step	Setting		Fan Max	Judgment (hr)	Operation (hr)
		Red button Black Button
1	1time	1time	480+ESP	8	9
2	2times	1time	480+ESP	6.5	10.5
3	3times	1time	480+ESP	5	12
4	4time	1time	440+ESP	8	9
5	5times	1time	440+ESP	6.5	10.5
6	6times	1time	440+ESP	5	12
7	7times	1time	400+ESP	8	9
8	8times	1time	400+ESP	6.5	10.5
9	9times	1time	400+ESP	5	12

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["Main PCB SW01S"]
    B --> C["ODU power reset"]
    C --> D["Master main PCB DIP switch ON ( No.11,14) "]
    D --> E["Press the black button Main PCB (5 sec.)"]
    E --> F["Vacuum mode setting ODU V/V OPEN<br>Main EEV, SC EEV OPEN<br>IDU EEV OPEN"]
    G["Master main PCB DIP switch OFF( No.11,14)"] --> H["Power reset"]
    H --> I["Vacuum mode cancellation"]
    J["Caution<br>ODU operation stops during vacuum mode. Compressor can't operate."] --> F

External 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

graph TD
    A["Static pressure compensation mode setting method"] --> B["DIP switch setting"]
    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"]

■ Each step's ESP setting condition

Step Range [Pa] Max. RPM
Step0 0 ≤ ESP < 40 -
Step1 40 ≤ ESP < 60 + 30 RPM
Step2 60 ≤ ESP < 80 + 60 RPM
Step3 80 ≤ ESP < 100 + 100 RPM
Step4 100 ≤ ESP ≤ 120 + 150 RPM

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 unit

011 → 051 : No.105 error of unit

	Display Title Cause of Error
Indoor unit related error	0	1	-	Air temperature sensor of indoor unit
	0	2	-	Inlet pipe temperature sensor of indoor unit
	0	3	-	Communication error: wired remote controller ↔ indoor unit
	0	4	-	Drain pump
	0	5	-	Communication error: outdoor unit ↔ indoor unit
	0	6	-	Outlet pipe temperature sensor of indoor unit
	0	7	-	Different operation mode
	0	9	-	Indoor EEPROM error.
	1	0	-	Poor fan motor operation
	1	1	-	Communication error: indoor unit → main PCB of outdoor.
Outdoor unit related error	2	1	1	Outdoor Unit Inverter Compressor IPM Fault
	2	2	1	Inverter Board Input Over Current(RMS) of Outdoor Unit
	2	3	1	Outdoor Unit Inverter Compressor DC link Low Voltage
	2	4	1	Outdoor Unit High Pressure Switch
	2	5	1	Outdoor Unit Input Voltage High/ Low Voltage
	2	6	1	Outdoor Unit Inverter Compressor Start Failure

	Display T			Title Cause of Error
Outdoor unit related error	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	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 Compressor High Discharge Temperature	System is turned off by Outdoor Uunit Constant Speed 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
	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 Fault	Outdoor Unit Heat Exchanger Temperature Sensor open or short
	4	6	1	Outdoor Unit Suction Temperature Sensor Fault	Outdoor Unit Suction Temperature Sensor open or short
	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	Communication error : inverter PCB → Main PCB	Failing to receive inverter signal at main PCB of Outdoor Unit
	5	3	1	Communication 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	6	1	Inverter PCB EEPROM Error of Outdoor Unit	Access Error of Inverter PCB of Outdoor Unit
	5	7	1	Communication error : inverter PCB → Main PCB	Restriction of Outdoor Unit (Inverter PCB)
	6	7	1	Outdoor Unit Fan Lock	Restriction of Outdoor Unit
	Display Title Cause of Error
Outdoor unit related error	7	4	1	Outdoor Unit 3 Phase Power unbalance	Outdoor Unit R-T Phase Difference is over 5A
	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
	1	0	5	Outdoor Unit Fan PCB Communication Error	Failing to receive fan signal at main PCB of unit.
	1	0	6	Outdoor Unit FAN IPM Fault Error	Instant Over Current at Outdoor Unit Fan IPM
	1	0	7	Outdoor Unit Fan DC Link Low Voltage Error	Outdoor Unit Fan DC Link Input Voltage is under 380V
	1	1	3	Outdoor Unit Liquid pipe Temperature Sensor Error	Liquid pipe temperature sensor of outdoor unit is open or short
	1	1	4	Outdoor Unit Subcooling Inlet Temperature Sensor Error	Outdoor Unit Subcooling Inlet Temperature Sensor open or short
	1	1	5	Outdoor Unit Subcooling Outlet Temperature Sensor Error	Outdoor Unit Subcooling Outlet Temperature Sensor open or short
	1	5	1	Failure of operation mode conversion at Outdoor Unit	Pressure unbalance in Outdoor Units
	1	9	3	Excessive increase of Outdoor Unit Fan PCB Heat Sink Temperature	Outdoor Unit Fan Inverter PCB Temperature is Over 95°C
	1	9	4	Outdoor Unit Fan PCB Heat Sink Temperature Sensor Error	Outdoor Unit Fan PCB Heat Sink Temperature Sensor open or short

Caution For Refrigerant Leak

The installer and system specialist shall secure safety against leakage according to local regulations or standards. The following standards may be applicable if local regulations are not available.

Introduction

Though the R410A refrigerant is harmless and incombustible itself, the room to equip the air conditioner should be large to such an extent that the refrigerant gas will not exceed the limiting concentration even if the refrigerant gas leaks in the room.

■ Limiting concentration

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

Limiting concentration: 0.44kg/m³(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.)"]
    E --> F["Indoor unit"]

Checking procedure of limiting concentration

Check limiting concentration along following steps and take appropriate measure depending on the situation.

■ Calculate amount of all the replenished refrigerant (kg) per each refrigerant system.

Amount of replenished refrigerant per one outdoor + unit system Amount of replenished refrigerant at factory shipment Amount of additional replenished refrigerant = Total amount of replenished refrigerant in refrigerant facility (kg) Amount of additionally replenished refrigerant depending on piping length or piping diameter at customer Note : In case one refrigerant facility is divided into 2 or more refrigerant systems and each system is independent, amount of replenished refrigerant of each system shall be adopted.

■ Calculate minimum room capacity

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

(1) Without partition

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

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

■ Calculate refrigerant concentration

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

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

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.

2.1 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) Select a well-drained place.

※ 1. If you can't meet above guide line in the seaside installation, please contact LG Electronics for the additional anticorrosion treatment.
2. Periodic (more than once/year) cleaning of the dust or salt particles stuck on the heat exchanger by using water.

CAUTION:

Multi V Space should be installed in the special outdoor room with soundproofing walls.

LG

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