LG ARUN080BSS0 INSTALLATION MANUAL

MFL67798018

Rev.00_061418

INSTALLATION MANUAL

AIR
CONDITIONER

www.lg.com

Copyright © 2014 - 2018 LG Electronics Inc. All Rights Reserved.

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.

ENGLISH

ESPAÑOL

PORTUGUÊS

TIPS FOR SAVING ENERGY

2

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TIPS FOR SAVING ENERGY

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

• Do not cool excessively indoors. This may be harmful for your health and may consume more
electricity.

• Block sunlight with blinds or curtains while you are operating the air conditioner.

• Keep doors or windows closed tightly while you are operating the air conditioner.

• Adjust the direction of the air flow vertically or horizontally to circulate indoor air.

• Speed up the fan to cool or warm indoor air quickly, in a short period of time.

• Open windows regularly for ventilation as the indoor air quality may deteriorate if the air condi­tioner is used for many hours.

• Clean the air filter once every 2 weeks. Dust and impurities collected in the air filter may block the
air flow or weaken the cooling / dehumidifying functions.

For your records

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

Model number :

Serial number :

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

Dealer’s name :

Date of purchase :

IMPORTANT SAFETY INSTRUCTIONS

IMPORTANT SAFETY INSTRUCTIONS

READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE.

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

WARNING

!

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

CAUTION

!

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

WARNING

!

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

• The information contained in the manual is intended for use by a qualified service technician
familiar with safety procedures and equipped with the proper tools and test instruments.

• Failure to carefully read and follow all instructions in this manual can result in equipment mal­function, property damage, personal injury and/or death.

Installation

• Have all electric work done by a licensed electrician according to "Electric Facility Engineering Stan­dard" and "Interior Wire Regulations" and the instructions given in this manual and always use a spe­cial circuit.

- If the power source capacity is inadequate or electric work is performed improperly, electric shock

or fire may result.

• Ask the dealer or an authorized technician to install the air conditioner.

- Improper installation by the user may result in water leakage, electric shock, or fire.

• Always ground the product.

- There is risk of fire or electric shock.

• Always intstall a dedicated circuit and breaker.

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

• For re-installation of the installed product, always contact a dealer or an Authorized Service Center.

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

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

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

• Do not store or use flammable gas or combustibles near the air conditioner.

- There is risk of fire or failure of product.

• Use the correctly rated breaker or fuse.

- There is risk of fire or electric shock.

• Prepare for strong wind or earthquake and install the unit at the specified place.

- Improper installation may cause the unit to topple and result in injury.

- While installing the product on the rooftop, maintain sufficient distance from the edge to prevent

falling down from the building.

• Do not install the product on a defective installation stand.

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

• Use a vacuum pump or Inert(nitrogen) gas when doing leakage test or air purge. Do not compress
air or Oxygen and do not use Flammable gases. Otherwise, it may cause fire or explosion.

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

3

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4

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• When installing and moving the air conditioner to another site, do not charge it with a

• Do not reconstruct to change the settings of the protection devices.

• Ventilate before operating air conditioner when gas leaked out.

• Securely install the cover of control box and the panel.

• If the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant

Operation

• Do not damage or use an unspecified power cable.

• Use a dedicated power cable for this appliance.

• Be cautious that water could not enter the product.

• Do not touch the power switch with wet hands.

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

• Be cautious not to touch the sharp edges when installing.

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

• Do not open the inlet grille of the product during operation. (Do not touch the electrostatic filter, if the unit is so

IMPORTANT SAFETY INSTRUCTIONS

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.

- 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.

- It may cause explosion, fire, and burn.

- If the cover and panel are not installed securely, dust or water may enter the outdoor unit and fire
or electric shock may result.

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.

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

- There is risk of fire or electrical shock.

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

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

- There is risk of fire or electric shock.

- It may cause injury.

- This could result in personal injury and product damage.

equipped.)

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

CAUTION

!

IMPORTANT SAFETY INSTRUCTIONS

5

Installation

• Always check for gas (refrigerant) leakage after installation or repair of product.

- Low refrigerant levels may cause failure of product.

• Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods.

- It may cause a problem for your neighbors.

• Keep level even when installing the product.

- To avoid vibration or water leakage.

• Do not install the unit where combustible gas may leak.

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

• Use power cables of sufficient current carrying capacity and rating.

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

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

- There is risk of damage or loss of property.

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

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

• When installting 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.

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Operation

• Do not use the air conditioner in special environments.

-

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

• Do not block the inlet or outlet.

- It may cause failure of appliance or accident.

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

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

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

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

sonal 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.

6

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• Safely dispose of the packing materials.

• Turn on the power at least 6 hours before starting operation.

• Do not touch any of the refrigerant piping during and after operation.

• Do not operate the air conditioner with the panels or guards removed.

• Do not directly turn off the main power switch after stopping operation.

•

• Use a firm stool or ladder when cleaning or maintaining the air conditioner.

• Do not insert hands or other objects through the air inlet or outlet while the air conditioner is powered on.

IMPORTANT SAFETY INSTRUCTIONS

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.

- 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.

- It can cause a burn or frostbite.

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

- 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 outdoour units. Auto-addressing
should also be done in case of changing the indoor unit PCB.

- Be careful and avoid personal injury.

- There are sharp and moving parts that could cause personal injury.

TABLE OF CONTENTS

TABLE OF CONTENTS

7

ENGLISH

2 TIPS FOR SAVING

ENERGY

3 IMPORTANT SAFETY

INSTRUCTIONS

8 INSTALLATION

PROCESS

9 OUTDOOR UNITS IN-

FORMATION

10 ENVIRONMENT-

FRIENDLY ALTERNATIVE
REFRIGERANT R410A

11 SELECT THE BEST

LOCATION

12 INSTALLATION SPACE

16 Collective / Continuous Installation for

roof top use

18 LIFTING METHOD
19 INSTALLATION

19 The location of the Anchor bolts
20 Foundation for Installation
21 Preparation of Piping

Plumbing materials and storage methods

24

26 REFRIGERANT PIPING

INSTALLATION

26 Precautions on Pipe connection / Valve

operation

27 PIPE CONNECTIONS

BETWEEN INDOOR AND
OUTDOOR UNIT

27 Preparation Work
28 Pipe Drawing Out

30 Selection of Refrigerant Piping
31 Refrigerant piping system
38 Refrigerant charging
39 Distribution Method
40 Branch pipe Fitting
44 Leak Test and Vacuum drying
46 Vacuum Mode
47 Heat insulation of refrigerant piping

48 ELECTRICAL WIRING

48 Caution
50 Control box and connecting position of

wiring

51 Communication and Power Cables
52 Wiring of main power supply and

equipment capacity

53 Field Wiring
56 Installation of IO Module(optional)
57 Checking the setting of outdoor units
58 Automatic Addressing
61 Group Number setting
62 Cool & Heat selector
63 Static pressure compensation mode
64 Night Low Noise Function
65 Setting the ODU address
66 Snow removal & rapid defrost
67 Target pressure adjusting
68 Self-Diagnosis Function

71 CAUTION FOR

REFRIGERANT LEAK

71 Introduction
71 Checking procedure of limiting

concentration

73 INSTALLATION GUIDE

AT THE SEASIDE

INSTALLATION PROCESS

8

ENGLISH

INSTALLATION PROCESS

Determination of division work

Preparation of contract drawings

Sleeve and insert work

Installation of indoor unit

Refrigerant piping work

Drain pipe work

Duct work

Heat insulation work

Electrical work

(connection circuits and drive circuits)

Leak test

Vacuum drying

Additional charge of refrigerant

Fit facing panels

Indicate clearly who will be responsible for switch setting.

Make connection clearly between outdoor, indoor, remote controller and option.

Take account of gradient
of drain piping

Check model name to make
sure the fitting is made correctly

Special attention to dryness,
cleanness and tightness

Adjust to downward gradient

Make sure airflow is sufficient

Make sure no gaps are left where
the insulating materials are joined

Multiple core cable must not be used.
(suitable cable should be selected)

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

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

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

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

Outdoor unit foundation work

Installation of outdoor unit

2

) there must be no drop in pressure.

The foundation must be level even

Avoid short circuits and ensure
sufficient space is allowed for service

Automatic addressing of indoor unit

Test run adjustment

Transfer to customer with explanation

CAUTION

!

Refer to automatic addressing flowchart
Preheat the crank case with the electrical heater for more than 6 hours.

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

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

• The above list indicates the order in which the individual work operations are normally car­ried out but this order may be varied where local conditions warrants such change.

• The thickness of the piping should comply with the relevant local and national regulations
for the designed pressure 3.8MPa.

• Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in
its liquid state.(If the refrigerant is charged in its gaseous state, its composition changes
and the system will not work properly.)

OUTDOOR UNITS INFORMATION

OUTDOOR UNITS INFORMATION

CAUTION

!

• Ratio of the connectable Indoor Units to the Outdoor: Within 50 ~ 160%

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

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

Power Supply : 3 Ø, 220-240 V3, 50 Hz

3 Ø, 220 V3, 60 Hz

System(HP) 8 10 12

Model A(C)RUN080BSS0 A(C)RUN100BSS0 A(C)RUN120BSS0

Refrigerant Precharged
Amount

Net weight

Dimensions (WxHxD)

Piping
Connections

Liquid Pipes mm(inch) Ø9.52(3/8) Ø9.52(3/8) Ø12.7(1/2)

Gas Pipes mm(inch) Ø19.05(3/4) Ø22.2(7/8) Ø28.58(11/8)

kg 3.5 4.5 6

lbs 7.7 9.9 13.2

kg 115 144 157

lbs 254 317 346

mm 950 x 1,380 x330 1,090 x 1,625 x 380 1,090 x 1,625 x 380

inch 37.4 x 54.3 x 13.0 42.9 x 64.0 x 15.0 42.9 x 64.0 x 15.0

9

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ENVIRONMENT-FRIENDLY ALTERNATIVE REFRIGERANT R410A

10

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ENVIRONMENT-FRIENDLY ALTERNATIVE RE­FRIGERANT R410A

The refrigerant R410A has the property of higher operating pressure in comparison with R22.
Therefore, all materials have the characteristics of higher resisting pressure than R22 ones and
this characteristic should be also considered during the installation.
R410A is an azeotrope of R32 and R125 mixed at 50:50, so the ozone depletion potential (ODP)
of R410A is 0. These days the developed countries have approved it as the environment-friendly
refrigerant and encouraged to use it widely to prevent environment pollution.

CAUTION

!

• The wall thickness of the piping should comply with the relevant local and national regula­tions for the designed pressure 3.8MPa

• Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in
its liquid state.
If the refrigerant is charged in its gaseous state, its composition changes and the system
will not work properly.

• Do not place the refrigerant container under the direct rays of the sun to prevent it from
exploding.

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

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

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

SELECT THE BEST LOCATION

Air inlet grille

700

SELECT THE BEST LOCATION

1 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.

2 Select installation location considering following conditions to avoid bad condition when addi-

tionally 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 sunshine always shines.

• 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:

- Shade position with a narrow space

- Location with much moisture in neighboring floor.

- Location with much humidity around.

- Location where ventilation is good. It is recommended to install the outdoor unit at a place
with a lot of sunshine as possible as.

- Location where water gathers since the floor is not even.

3

When installing the outdoor unit in a place that is constantly exposed to a strong wind like a coast
or on a high story of a building, secure a normal fan operation by using a duct or a wind shield.

• Install the unit so that its discharge port faces to the wall of the building.
Keep a distance 500mm or more between the unit and the wall surface.

• Supposing the wind direction during the operation season of the air conditioner, install the
unit so that the discharge port is set at right angle to the wind direction.

11

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Turn the air outlet side toward the
building's wall, fence or windbreak screen.

[Unit : mm]

WARNING

!

Fix the outdoor unit firmly with anchor bolt
or it may fall and hurt people. (refer to
‘Foundation for installation’)

INSTALLATION SPACE

500 or less

more

1,000 or

c

a

100 or

more

100 or

more

500 or less

more

1,000 or

150 or

more

150 or

more

c

b

100 or

more

200 or

more

1,000 or

more

c

500 or less

more

1,000 or

100 or

more

1,000 or

more

200 or

more

c

12

ENGLISH

INSTALLATION SPACE

• The following values are the least space for installation. If any service area is needed for service
according to field circumstance, obtain enough service space.

• The unit of values is mm.

In case of obstacles on the suction side

1. Stand alone installation

2. Collective installation

[Unit:mm]

a 100 or more 200 or more
b 100 or more 300 or more
c 300 or more 350 or more

8HP 10Hp/12HP

In case of obstacles on the discharge side

a

500 or less

more

1,000 or

a

1,000 or more

100 or

more

500 or less

1,000 or more

1,000 or more

100 or

more

1. Stand alone installation

2. Collective installation

INSTALLATION SPACE

[Unit:mm]

13

ENGLISH

8HP 10Hp/12HP

a 500 or more 700 or more

INSTALLATION SPACE

H

L

350 or

more

a

L

500 or less

1,000 or

more

H

350 or

more

1,000 or

more

L

H

350 or

more

1,000 or

more

100 or more

L

500 or less

1,000 or

more

H

350 or

more

1,250 or more

100 or more

14

ENGLISH

In case of obstacles on the suction and the discharge side

Obstacle height of discharge side is higher than the unit

1. Stand alone installation

L > H L > H

[Unit:mm]

2. Collective installation

L > H L > H

a 500 or more 700 or more

8HP 10Hp/12HP

Obstacle height of discharge side is lower than the unit

H

L

350 or

more

1,500 or

more

100 or more

500 or less

more

1,000 or

H

L

350 or

more

1,500 or

more

100 or more

H

L

350 or

more

1,000 or

more

500 or less

more

1,000 or

H

L

350 or

more

1,000 or

more

1. Stand alone installation

L ≤ HL ≤ H

2. Collective installation

L ≤ HL ≤ H

INSTALLATION SPACE

[Unit:mm]

15

ENGLISH

INSTALLATION SPACE

350 or

more

2,000 or

more

600 or

more

1,000 or

more

L

350 or

more

3,000 or

more

H

600 or

more

1,500 or

more

100 or

more

16

ENGLISH

Collective / Continuous Installation for roof top use

Space required for collective installation and continuous installation: When installing several units,
leave space between each block as shown below considering passage for air and people.

1. One row of stand alone installation

[Unit:mm]

2. Rows of collective installation (2 or more)

• L should be smaller than H

L ≤ H

INSTALLATION SPACE

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.

17

ENGLISH

LIFTING METHOD

18

ENGLISH

LIFTING METHOD

• When carrying the suspended, unit pass the ropes between legs of base panel under the unit.

• 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.

• Use only accessories and parts which are of the designated specification when installing.

Air outlet grille Intake hole

Always hold the unit by the corners, as holding
it by the side intake holes on the casing may
cause them to deform.

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.

Corner

Handle

A

40° or less

Sub line

WARNING

INSTALLATION

At least 100mm

At least 100m

m

At least 100m

m

At least 100mm

At least 100mm

At least 100mm

Center of the Unit

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

Center of the Unit

a

b

cd

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.

19

ENGLISH

The location of the Anchor bolts

[Unit : mm]

a 920 1,090
b 618 700
c 330 380
d 360 401

8HP 10Hp/12HP

At least 200mm

Unit : mm

200

75

75

200

100

INSTALLATION

20

ENGLISH

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).

Ⓐ 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.

CAUTION

!

• Be sure to remove the Pallet(Wood Support) of the
bottom side of the outdoor unit Base Pan before fix­ing the bolt. It may cause the unstable state of the
outdoor settlement, and may cause freezing of the
heat exchanger resulting in abnormal operations.

• Be sure to remove the Pallet(Wood Support) of the
bottom side of the outdoor unit before welding.
Not removing Pallet(Wood Support) causes hazard
of fire during welding.

Pallet(Wood Support)

- Remove before Installation

INSTALLATION

Copper

tube

90°

Slanted Uneven Rough

Pipe

Reamer

Point down

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Inclined

Inside is shining without scratches.

Smooth all round

Even length

all round

Surface

damaged

Cracked Uneven

thickness

= Improper flaring =

Preparation of Piping

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

Cut the pipes and the cable

- Use the accessory piping kit or the pipes pur­chased locally.

- Measure the distance between the indoor
and the outdoor unit.

- Cut the pipes a little longer than measured
distance.

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

Burrs removal

- Completely remove all burrs from the cut
cross section of pipe/tube.

- Put the end of the copper tube/pipe to down­ward direction as you remove burrs in order
to avoid to let burrs drop in the tubing.

Flaring work

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

21

ENGLISH

<16.0(54,600) 5/8" 3/8" 0.8~1.0 0.5~0.8
<22.4(76,400) 3/4" 3/8" 1.0~1.3 0.5~0.8

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

Check

- Compare the flared work with figure below.

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

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

Union

INSTALLATION

22

ENGLISH

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

Ø9.52 38±4 12.8-13.2

Ø12.7 55±6 16.2-16.6

Ø15.88 75±7 19.3-19.7

CAUTION

!

• Always use a charge hose for service port connection.

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

• When loosening a flare nut, always use two wrenches in
combination, When connecting the piping, always use a spanner and
torque wrench in combination to tighten the flare nut.

• When connecting a flare nut, coat the flare(inner and outer faces)
with oil for R410A(PVE) and hand tighten the nut 3 to 4 turns as the
initial tightening.

90

A

2

45

R=0.4~0.8

2

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.

INSTALLATION

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

Ø6.35
Ø9.52 38±4
Ø12.7 9±0.9

Ø15.88 15±1.5

Ø22.2
Ø25.4

Shaft(valve body) Cap(Valve lid) Service port Flare nut

6±0.6

30±3

Hexagonal

wrench 4mm

Hexagonal

wrench 6mm

Hexagonal

wrench 10mm

Tightening torque N·m(Turn clockwise to close)

29.4±2.9

12.7±2

53.9±5.8

Gas line piping attached to unit

16±2

55±6

75±7

- 25±3

-

Insulation of shutoff valve

1 Use the heat insulation material for the refrigerant piping which has an excellent heat-resis-

tance (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.

23

ENGLISH

Indoor unit

Fastening band
(accessory)

Refrigerant piping

Thermal insulator
(accessory)

INSTALLATION

Moisture

Dust

Leakage

24

ENGLISH

Plumbing materials and storage methods

Pipe must be able to obtain the specified thickness and should be used with low impurities.
Also when handling storage, pipe must be careful to prevent a fracture, deformity and wound.
Should not be mixed with contaminations such as dust, moisture.

Refrigerant piping on three principles

Drying Cleanliness Airtight

Should be no moisture inside No dust inside.

Items

There is no refrigerant leak-

age

Cause
failure

Counter­measure

- Significant hydrolysis of re­frigerant oil

- Degradation of refrigerant
oil

- Poor insulation of the com­pressor

- Do not cold and warm

- Clogging of EEV, Capillary

- No moisture in the pipe

- Until the connection is
completed, the plumbing
pipe entrance should be
strictly controlled.

- Stop plumbing at rainy day.

- Pipe entrance should be
taken side or bottom.

- When removal burr after
cutting pipe, pipe entrance
should be taken down.

- Pipe entrance should be
fitted cap when pass
through the walls.

- Degradation of refrigerant
oil

- Poor insulation of the com­pressor

- Do not cold and warm

- Clogging of EEV, Capillary

- No dust in the pipe.

- Until the connection is
completed, the plumbing
pipe entrance should be
strictly controlled.

- Pipe entrance should be
taken side or bottom.

- When removal burr after
cutting pipe, pipe entrance
should be taken down.

- Pipe entrance should be
fitted cap when pass
through the walls.

- Gas shortages

- Degradation of refrigerant
oil

- Poor insulation of the com­pressor

- Do not cold and warm

- Airtightness test should
be.

- Brazing operations to com­ply with standards.

- Flare to comply with stan­dards.

- Flange connections to
comply with standards.

INSTALLATION

Nitrogen substitution method

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

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

It prevents normal operation of the compressor.
In order to avoid this problem, Welding should be done after replacing air by nitrogen gas.
When welding plumbing pipe, the work is required.

Regulator

Welding Point

Nitrogen gas
Pressure 0.02MPa less

Oxide scale

Note) should not block the outlet side.
When the internal pressure in pipe is abo
ve the atmospheric pressure, pinhole is o
ccurred and it is a leakage cause.

Taping
(Should not
contain air)

Auxiliary valve

Nitrogen

25

ENGLISH

CAUTION

!

1 Always use the nitrogen.(not use oxygen, carbon dioxide, and a Chevron gas):

Please use the following nitrogen pressure 0.02MPa
Oxygen – Promotes oxidative degradation of refrigerant oil.
Because it is flammable, it is strictly prohibited to use
Carbon dioxide – Degrade the drying characteristics of gas
Chevron Gas – Toxic gas occurs when exposed to direct flame.

2 Always use a pressure reducing valve.

3. Please do not use commercially available antioxidant.
The residual material seems to be the oxide scale is observed.
In fact, due to the organic acids generated by oxidation of the alcohol contained in the anti­oxidants, ants nest corrosion occurs. (causes of organic acid  alcohol + copper + water +
temperature)

REFRIGERANT PIPING INSTALLATION

Refrigerant
Charging Port

Liquid pipe
Gas pipe

26

ENGLISH

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.

※Pictures may differ depending on the model.

WARNING

!

• Always careful not to leak the refrigerant during welding.

• The refrigerant generates poisonous gas harmful to human body if combusted.

• Do not perform welding in a closed space.

• Be sure to close the cap of the service port to prevent gas leakage after the work.

CAUTION

!

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

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

Nitrogen
Direction

Removal Area for Liquid/Gas pipe
bottom side connections.

<Gas pipe>

<Liquid pipe>

Wet towel

PIPE CONNECTIONS BETWEEN INDOOR AND
OUTDOOR UNIT

27

ENGLISH

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

- 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.

Regulator

Valve

Nitrogen

Front Pipe

Draw Out

Bottom Side Pipe

Draw Out

Rear Side Pipe
Draw Out

Right Side Pipe
Draw Out

Refrigerant Pipe

Nitrogen

Nitrogen
Direction

Direction

Taping

Preparation Work

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

※Pictures may differ depending on the model.

CAUTION

!

• Do not give damage to the pipe/base during the Knock Out work.

• Proceed to pipe work after removing burr after Knock Out work.

•

Perform sleeve work to prevent damage to the wire when connecting wires using knock Outs.

• Take care so that there is no thermal damage on the service valves of the outdoor unit.
(Especially packing part of service port.) Wrap the service valve with a wet towel when
brazing it as shown figure above.

t

Pipe Knock Out for
Liquid/Gas pipes

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

28

ENGLISH

Remove leakage prevention cap

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

• Proceed the leakage prevention cap removal as follows:

- Verify whether the liquid/gas pipes are locked.

- Extract remaining refrigerant or air inside using the service port.

- Remove the leakage prevention cap

Service Port

Refrigerant
Charging Por

Liquid pipe

Gas pipe

Liquid pipe
Gas pipe

Leakage Prevention Cap

Pipe Drawing Out

Method of drawing out pipes on the front side and right side

- Proceed with the pipe work as shown in the below figure for front side and right side pipe draw-

ing out.

※Pictures may differ depending on the model.

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

Pipe Knock Out for Liquid/Gas pipes

Method of drawing out pipes on the bottom side

- Drawing out common pipe through base panel

Remove only liquid/gas pipe Knock out

Liquid pipe Gas pipe

29

ENGLISH

Method of drawing out pipes on the rear side

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

※Pictures may differ depending on the model.

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

30

ENGLISH

Selection of Refrigerant Piping

Outdoor unit

Gas pipe

Main pipe

No.

Piping parts Name Selection of pipe size

Outdoor unit

①

1st branching section

Liquid pipe

↓

Branching

Branching

pipe

Main pipe

pipe

Size of main pipe

Outdoor unit
capacity[HP]

8 Ø9.52(3/8) Ø19.05(7/8)

10 Ø9.52(3/8) Ø22.2(7/8)

12HP Ø12.7(1/2)

Indoor unit

Liquid pipe
[mm(inch)]

Gas pipe

[mm(inch)]

Ø28.58(11/8)

②

③

Branching section

↓

Branching section

Branching section

↓

Indoor unit

Branching pipe

Indoor unit

connecting pipe

Pipe size of between branching sections

Indoor unit

capacity[kW(Btu/h)]

≤ 5.6(19,100)

< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
< 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

< 36.4(124,200) Ø9.52(3/8) Ø22.2(7/8)

Liquid pipe
[mm(inch)]

Ø6.35(1/4) Ø12.7(1/2)

Gas pipe

[mm(inch)]

Connecting pipe size of indoor unit

Indoor unit

capacity[kW(Btu/h)]

≤ 5.6(19,100)

< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400)
≤ 28.0(95,900)

Liquid pipe
[mm(inch)]

Ø6.35(1/4) Ø12.7(1/2)

Ø9.52(3/8) Ø19.05(3/4)
Ø9.52(3/8) Ø22.2(7/8)

Gas pipe

[mm(inch)]

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

Refrigerant piping system

Y branch method

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units

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

H 50m

L150m

l 40m

31

ENGLISH

L

l

H

h

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

Longest pipe length Equivalent pipe length(*)

A+B+C+D+e ≤ 150m A+B+C+D+e ≤ 175m

Longest pipe length after 1st branch

B+C+D+e ≤ 40m

Difference in height (Outdoor Unit ÷ Indoor Unit)

H ≤ 50m (40m : Outdoor Unit is lower than Indoor Units)

Difference in height (Indoor Unit ÷ Indoor Unit)

h ≤ 15m

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

32

ENGLISH

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

Outdoor unit

total capacity (HP)

8 Ø9.52(3/8) Ø19.05(3/4)

10 Ø9.52(3/8) Ø22.2(7/8)

12 Ø12.7(1/2) Ø28.58(11/8)

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

Downward Indoor Unit

total capacity [kW(Btu/h)]

≤ 5.6(19,100)

< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400)

< 36.4(124,200) Ø9.52(3/8) Ø22.2(7/8)

WARNING

!

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

- The equivalent length between outdoor unit and the farthest indoor unit is 90m or more
(Liquid and Gas pipes are increased)

- The level difference (Outdoor unit ÷ Indoor unit) is 50m or more (Only liquid pipe is in­creased)

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

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

Ø6.35(1/4) Ø12.7(1/2)

Ø9.52(3/8) Ø19.05(3/4)

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

Header Method

Example : 6 Indoor Units connected

Ⓐ : Outdoor Unit
Ⓑ : Header
Ⓒ : Indoor Units
Ⓓ : Sealed piping

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

H 50m

L 150m

40m

33

ENGLISH

L

l

H

h

WARNING

!

Pipe length after header branching (a~f)
It is recommended that difference in length of the pipes connected to the Indoor Units is

minimized. Performance difference between Indoor Units may occur.

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

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

Longest pipe length Equivalent pipe length(*)

A+f ≤ 150m A+f ≤ 175m

Longest pipe length after 1st branch

f ≤ 40m

Difference in height (Outdoor Unit ÷ Indoor Unit)

H ≤ 50m (40m : Outdoor Unit is lower than Indoor Units)

Difference in height (Indoor Unit ÷ Indoor Unit)

h ≤ 15m

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

34

ENGLISH

Combination of Y branch/header method

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping

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

H 50m

L 150m

40m

Branch pipe can not be used after header

L

l

H

h

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

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

WARNING

!

• It is recommended that difference of piping length for pipes connected to the Indoor Unit
is minimized. Performance difference between Indoor Units may occur.

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

- The equivalent length between outdoor unit and the farthest indoor unit is 90m or more
(Liquid and Gas pipes are increased)

Longest pipe length Equivalent pipe length(*)

A+B+b ≤ 150m A+B+b ≤ 175m

Longest pipe length after 1st branch

B+b ≤ 40m

Difference in height (Outdoor Unit ÷ Indoor Unit)

H ≤ 50m (40m : Outdoor Unit is lower than Indoor Units)

Difference in height (Indoor Unit ÷ Indoor Unit)

h ≤ 15m

culation purpose

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

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

35

ENGLISH

Outdoor unit

total capacity(HP)

8 Ø9.52(3/8) Ø19.05(3/4)

10 Ø9.52(3/8) Ø22.2(7/8)

12 Ø12.7(1/2) Ø28.58(11/8)

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

Downward Indoor Unit

total capacity [kW(Btu/h)]

≤ 5.6(19,100)

< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400)

< 36.4(124,200) Ø9.52(3/8) Ø22.2(7/8)

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

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

Ø6.35(1/4) Ø12.7(1/2)

Ø9.52(3/8) Ø19.05(3/4)

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

36

ENGLISH

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.

Indoor Unit Connection

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

Indoor Unit capacity

[kW(Btu/h)]

≤ 5.6(19,100)

< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)

≤ 22.4(76,400)

≤ 28.0(95,900)

CAUTION

!

• Bending radius should be at least twice the
diameter of the pipe.

• Bend pipe after 500mm or more from
branch(or header).
Do not bend U type.
It may cause Performance unsatisfactory or
noise.

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

Ø6.35(1/4) Ø12.7(1/2)

Ø9.52(3/8) Ø19.05(3/4)

Ø9.52(3/8) Ø22.2(7/8)

500mm or more

500mm or more

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

37

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 : Ø9.52 mm x 0.061(kg/m)

+ Total liquid pipe : Ø6.35 mm x 0.022(kg/m)

+ CF value of indoor unit

Amount refrigerant of Indoor units
Example) 4Way Ceiling Cassette 14.5kW -1ea, Ceiling concealed Duct w7.3kW-2ea,

Attach the additional refrigerant table of IDU.

Wall Mounted 2.3kW-4ea
CF = 0.64 × 1 + 0.26 × 2 + 0.24 × 4 = 2.12 kg

ENGLISH

CAUTION

!

Do not connect 0 or 1 series of indoor unit. ex)ARNU****0(X) , ARNU****1(X)

38

Liquid pipe

Gas pipe

ENGLISH

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

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

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

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

- Installation of effective opening part

- Reconfirmation of Outdoor Unit capacity and piping length

- Reduction of the amount of refrigerant

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

• Change Indoor Unit type
:

installation position should be over 2m from the floor (Wall mounted type → Cassette type)

• Adoption of ventilation system
: choose ordinary ventilation system or building ventilation system

• Limitation in piping work
: Prepare for earthquake and thermal stress

≤ 0.44 ( kg / m3)

Refrigerant charging

Ⓐ Manifold Gauge
Ⓑ Low pressure side Handle
Ⓒ High pressure side Handle

WARNING

!

• Pipe to be vacuumed : gas pipe, liquid pipe

• If the refrigerant amount is not exact, it may not operate properly.

• If additionally bottled refrigerant amount is over 10%, condenser burst or insufficient in­door unit performance may be caused.

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

Header

1st

1st

1st

Main pipe

Distribution

2nd

2nd

3rd

3nd

Main pipe

Distribution

1st

3rd

3rd main pipe distribution

2nd

Distribution Method

Horizontal Distribution

Vertical Distribution

- Ensure that the branch pipes are attached vertically.

39

ENGLISH

The others

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

A

B

A

B

40

ENGLISH

Branch pipe Fitting

Y branch

Ⓐ To Branch Piping or Indoor Unit
Ⓑ To Outdoor Unit

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

Horizontal
plane

Within +/- 10

A

Viewed from point A
in direction of arrow

Facing

downwards

Within 3 Within 3

Facing

upwards

• 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.

Tape
(field supply)

Insulator

(included with kit)

Liquid and gas
pipe joints

Insulator for
field piping

Header

Ⓐ To Outdoor Unit Ⓑ To Indoor Unit

• The indoor unit having larger capacity must be in-

stalled 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.

C

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

ⓒ Pipe cutter

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

Horizontal plane

View from point B in the direction of the arrow

• 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.

• 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.

41

ENGLISH

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

Insulator

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

Cap pipe

Tape

Insulator of field pipe

Insulator for cap pipe

Tape

42

I.D19.05

O.D15.88

I.D12.7

I.D15.88

I.D12.7

I.D15.88

I.D15.88

I.D12.7

292

281

74

70

I.D12.7

O.D9.52

I.D6.35

I.D9.52

I.D.9.52

I.D.6.35

I.D9.52

I.D.6.35

292

281

74

70

1

1

I.D25.4

413

390

83

I.D15.88

I.D19.05

I.D12.7

I.D12.7I.D19.05I.D15.88I.D19.05I.D22.2

I.D28.58

O.D25.4

I.D22.2

O.D19.05

O.D19.05

I.D22.2

I.D25.4

70 80 11 0

1

2

3

3 1 2

0

I.D9.52

I.D12.7

53.6D.I25.9D.I

I.D9.52

I.D12.7

I.D6.35

I.D12.7

332

321

74

376
404

96

I.D34.9

O.D31.8

I.D22.2

O.D22.2

I.D28.58

I.D31.8

O.D19.05

I.D28.58

120 90 120

I.D31.8

2.22D.I85.82D.I

I.D19.05

I.D15.88

I.D12.7

I.D19.05

I.D15.88

2

3

1

2

1 3

25.9D.I25.9D.I7.21D.O

I.D15.88 I.D19.0 5

I.D12.7

I.D12.7

I.D19.05

I.D15.88I.D12.7

I.D19.05

O.D12. 7I.D6.35

I.D15.88

371
394

83

11 0 70

2

3

3 2

471
517

125

120 130

I.D19.05

I.D15.88

I.D12.7

I.D19.05

I.D22.2

I.D41.3 I.D38.1

I.D41.3

O.D34.9

I.D34.9

I.D34.9

I.D22.2

I.D28.58

I.D28.58I.D38.1

I.D41.3

I.D34.9

I.D38.1

O.D22.2

O.D38.1

O.D15.88

O.D28.58

90

2

3

3

3

2

2

3

416
444

96

O.D15.88 I.D9.52

I.D12.7

O.D12. 7 I.D6.35

I.D9.52

I.D15.88 I.D19.05

I.D22.2

I.D22.2

I.D19.05

I.D15.88

I.D12.7

I.D15.88

I.D19.05

I.D22.2

O.D19.0 5

80

11 0 11 0

2

3

1

2 3 3

O.D.28.58

I.D.22.2

115

X2

100

O.D15.88

I.D12.7

70

O.D.22.2

I.D.15.88I.D.19.05

120

O.D.38.1

I.D.34.9

I.D.28.58 O.D.44.48

X2

175

I.D31.8 I.D.53.98 I.D.25.4

I.D.44.48

I.D.44.48

I.D38.1I.D41.3

I.D.44.48

I.D38.1I.D41.3

I.D.53.98

420
490

134

1

2

3

32

3 3

3

3

2

O.D.19.05 I.D.12.7

I.D.15.88

O.D12.7 I.D6.35

I.D9.52

X2

110 110

I.D25.4 I.D22.2

I.D.19.05

I.D.19.05I.D.22.2

I.D.25.4

I.D.25.4

I.D.22.2

346
379

96

2

3 32

3

ENGLISH

Y branch pipe

ARBLN01621

ARBLN03321

ARBLN07121

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

[unit:mm]

Models Gas pipe Liquid pipe

ARBLN14521

ARBLN23220

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

120

150

360

120

ID15.88

ID12.7

ID12.7

ID15.88

ID15.88

ID19.05

120

120

150

360

ID9.52

ID9.52

ID6.35

ID6.35

ID9.52

ID12.7

540

120

150

120

ID15.88

ID12.7

ID15.88

ID12.7

ID15.88

ID19.05

540

120

150

120

ID6.35

ID9.52

ID9.52

ID12.7

120

150

400

160

ID15.88

ID12.7

ID19.05

ID15.88

ID22.2

ID28.58ID25.4

120

120

150

360

ID9.52

ID9.52

ID6.35

ID6.35

ID9.52

ID12.7

120

150

160

580

ID19.05

ID15.88

ID15.88

ID12.7

ID22.2ID28.58 ID25.4

120

150

700

120

ID6.35

ID9.52

ID9.52

ID6.35

ID9.52ID12.7

120

150

160

760

ID19.05

ID15.88

ID15.88

ID12.7

ID22.2ID28.58 ID25.4

120

150

160

760

ID19.05

ID15.88

ID15.88

ID12.7

ID22.2ID28.58 ID25.4

120

150

182

775

ID19.05

ID15.88

ID15.88

ID12.7

ID28.58

ID31.8 ID34.9

120

150

107

60*9=540

700

ID6.35

ID9.52

ID19.05ID15.88

ID9.52

ID6.35

Header

Models Gas pipe Liquid pipe

4 branch

ARBL054

7 branch

ARBL057

4 branch

ARBL104

43

[unit:mm]

ENGLISH

7 branch

ARBL107

10 branch

ARBL1010

10 branch

ARBL2010

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

44

ENGLISH

Leak Test and Vacuum drying

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.

Slave 1 outdoor unit Master outdoor unit

Close

Nitrogen gas
cylinder

WARNING

!

Close

Close

Liquide pipe

Gas pipe

Close

Liquide pipe

Gas pipe

Liquid side

Gas side

Indoor unit

Use a vacuum pump or Inert(nitrogen) gas when doing leakage test or air purge. Do not com­press air or Oxygen and do not use Flammable gases. Otherwise, it may cause fire or explo­sion.

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

NOTE

!

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

There is a pressure change of approximately 0.1 kg/cm

2

(0.01 MPa) for each 1°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.

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

45

ENGLISH

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

vacuum pump commonly used for liquid pipe, gas pipe and high/low pressure common pipe. (Make Vacuum
from liquid pipe, gas pipe and high/low pressure common pipe with the service valve closed.)
* Never perform air purging using refrigerant.

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

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

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

Slave 1 outdoor unit Master outdoor unit

Vacuum
pump

Close

Close

Close

Close

Scale
Use a graviometer. (One that
can measure down to 0.1kg). If
you are unable to prepare such a
high-precision gravimeter you
may use a charge cylinder.

WARNING

!

Liquide pipe

Gas pipe

Liquide pipe

Gas pipe

Liquid side

Gas side

Indoor unit

Use a vacuum pump or Inert(nitrogen) gas when doing leakage test or air purge. Do not compress
air or Oxygen and do not use Flammable gases. Otherwise, it may cause fire or explosion.

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

NOTE

!

Always add an appropriate amount of refrigerant. (For the refrigerant additional charge)
Too much or too little refrigerant will cause trouble.
To use the Vacuum Mode
(If the Vacuum mode is set, all valves of Indoor units and Outdoor units will be opened.)

WARNING

!

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

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

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

46

ENGLISH

Vacuum Mode

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

Vacuum mode setting method

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“SVC” Push the ‘●’ button

DIP SWITCH 7-Segment

Select the Function using ‘▶’, ‘◀’ Button : :

“Se3” Push the ‘●’ button

Start the vacuum mode : “VACC”

ODU V/V open

ODU EEV open

IDU EEV open

SW04C

( X : cancel)

SW03C (

SW02C ( : backward)

SW01C ( : confirm)

SW01D (reset)

: forward)

ȯ

ȭ

Ɨ

Vacuum mode off method

Dip switch off and push the reset button on PCB

CAUTION

!

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

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

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

Liquid pipe
Gas pipe
Power cables
Finishing tape
Insulating material
Communication cables

• Be sure to fully insulate connecting portion.

These parts are not insulated.

Liquid pipe

Communication cables

Communication cables

Separ

-ation
Gas pipe
Power cables

Insulating material

Power cables

47

Heat insulation of refrigerant piping

Be sure to give insulation work to refrigerant piping by covering liquid pipe and gas pipe sepa­rately with enough thickness heat-resistant polyethylene, so that no gap is observed in the joint
between indoor unit and insulating material, and insulating materials themselves. When insula­tion work is insufficient, there is a possibility of condensation drip, etc. Pay special attention to in­sulation work to ceiling plenum.

Ⓐ Heat insulation material
Ⓑ Pipe
Ⓒ Outer covering(Wind the connection part

and cutting part of heat insulation material
with a finishing tape.)

Bad

example

Heat insulation

material

Outer

covering

NOTE

!

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

Adhesive + Heat - resistant poly-

ethylene foam + Adhesive tape

Indoor Vinyl tape

Floor ex-

Outdoor

Water-proof hemp cloth +

posed

Bronze asphalt

Water-proof hemp cloth +

Zinc plate + Oily paint

ENGLISH

Good

example

Penetrations

Inner wall (concealed)

A

B

Floor (fireproofing)

D

F

G

B

Outer wall Outer wall (exposed)

D

C

A

Roof pipe shaft

G

D

B

H

F

E

B

B

I

Penetrating portion on fire

limit and boundary wall

I

A

1m1m

Ⓐ Sleeve
Ⓑ Heat insulating material
Ⓒ Lagging
Ⓓ Caulking material
Ⓔ Band
Ⓕ Waterproofing layer
Ⓖ Sleeve with edge
Ⓗ Lagging material
Ⓘ Mortar or other incombustible caulking
Ⓙ Incombustible heat insulation material

J

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

Remote
control

Remote
control

Remote
control

Remote
control

Indoor

Unit

Outdoor Unit

Outdoor Unit

Indoor

Unit

Indoor

Unit

Indoor

Unit

Outdoor Unit

Outdoor Unit

Remote
control

Remote
control

Indoor

Unit

Indoor

Unit

Remote
control

Remote
control

Indoor

Unit

Indoor

Unit

48

ENGLISH

ELECTRICAL WIRING

Caution

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

WARNING

!

Be sure to have authorized electrical engineers do the electric work using special circuits in
accordance with regulations and this installation manual. If power supply circuit has a lack of
capacity or electric work deficiency, it may cause an electric shock or fire.

-

Install the Outdoor Unit communication cable away from the power source wiring so that it is not af­fected by electric noise from the power source. (Do not run it through the same conduit.)

- Be sure to provide designated grounding work to Outdoor Unit.

CAUTION

!

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

- Give some allowance to wiring for electrical part box of Indoor and Outdoor Units, because the
box is sometimes removed at the time of service work.

- Never connect the main power source to terminal block of communication cable. If connected,
electrical parts will be burnt out.

- Use 2-core shield cable for communication cable.(O mark in the figure below) If communication
cable of different systems are wired with the same multiplecore cable, the resultant poor trans­mitting and receiving will cause erroneous operations. ( mark in the figure below)

- Only the communication cable specified should be connected to the terminal block for Outdoor
Unit communication.

2-Core Shield Cable Multi-Core Cable

ELECTRICAL WIRING

Round pressure terminal

Power cable

CAUTION

!

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

cables.

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

• Never use multi-core cable

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

orate 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 lifes-

pan will be reduced.

Precautions when laying power wiring

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

When none are available, follow the instructions below.

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

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

49

ENGLISH

- For wiring, use the designated power cable and connect firmly, then secure to prevent outside
pressure being exerted on the terminal block.

- Use an appropriate screwdriver for tightening the terinal screws. A screwdriver with a small
head will strip the head and make proper tighterning impossible.

- Over-tightening the terminal screws may break them.

CAUTION

!

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

ELECTRICAL WIRING

50

ENGLISH

Control box and connecting position of wiring

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

- Connect communication cables between outdoor unit and indoor units through the terminal

block.

- When the central control system is connected to the outdoor unit, a dedicated PCB must be

connected between them.

- When connecting communication cable between outdoor unit and indoor units with shielded

cable, connect the shield ground to the earth screw.

Side panel

WARNING

!

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

- Provide an appropriate cover to intercept direct sunlight.

PI485 PCB

Indoor communication PCB
Main PCB

Terminal block
(Take care of the phase sequence
of 3-phase 4-wire power system)

10HP8HP

※Pictures may differ depending on the model.

(Inside the control box)

(Inside the control box)

Communication and Power Cables

Communication cable

- Types : shielding cable

- Cross section : 1.0~1.5mm

- Maximum allowable temperature: 60°C

- Maximum allowable cable length: under 300m

Remote control cable

- Types : 3-core cable

Central control cable

2

ELECTRICAL WIRING

51

ENGLISH

Product type Cable type Diameter

ACP 2-core cable (Shielding cable) 1.0~1.5mm

AC Smart 2-core cable (Shielding cable) 1.0~1.5mm

AC Ez 4-core cable (Shielding cable) 1.0~1.5mm

Separation of communication and power cables

- If communication and power cables are run alongside each other then there is a strong likeli­hood of operational faults developing due to interference in the signal wiring caused by electro­static and electromagnetic coupling.
The tables below indicates our recommendation as to appropriate spacing of communication
and power cables where these are to be run side by side

Current capacity of power cable Spacing

10A 300mm

100V or more

NOTE

!

• The figures are based on assumed length of parallel cabling up to 100m. For length in ex­cess of 100m the figures will have to be recalculated in direct proportion to the additional
length of cable involved.

• If the power supply waveform continues to exhibit some distortion the recommended
spacing in the table should be increased.

- If the cable are laid inside conduits then the following point must also be taken into ac­count when grouping various cable together for introduction into the conduits

- Power cable(including power supply to air conditioner) and communication cables
must not be laid inside the same

- In the same way, when grouping the power wires and communication cables should not
be bunched together.

50A 500mm

100A 1,000mm

Exceed 100A 1,500mm

2

2

2

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.

ELECTRICAL WIRING

52

ENGLISH

Wiring of main power supply and equipment capacity

- Use a separate power supply for the Outdoor Unit and Indoor Unit.

- Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when
proceeding with the wiring and connections.

- The cable size is the minimum value for metal conduit wiring. The power cable size should be 1
rank thicker taking into account the line voltage drops. Make sure the power-supply voltage
does not drop more than 10%.

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

- Power cable cords of parts of appliances for outdoor use should not be lighter than polychloro­prene sheathed flexible cable.

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

WARNING

!

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

• Make sure to use specified cables for connections so that no external force is imparted to
terminal connections. If connections are not fixed firmly, it may cause heating or fire.

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

CAUTION

!

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

• Do not use anything other than breaker and fuse with correct capacity. Using fuse and wire or
copper wire with too large capacity may cause a malfunction of unit or fire.

Communication cable

(2-wire Cable)

Communication cable

(3-wire Cable)

Power cable

(2-wire Cable)

Power cable

(2-wire Cable)

Power cable

(2-wire Cable)

Power cable

(2-wire Cable)

[Outdoor Unit]

[Indoor Units]

Pull Box
(Installer option)

Pull Box
(Installer option)

Pull Box
(Installer option)

Pull Box
(Installer option)

L

N

Power Line

(3 Wires Cable)

Power Line

(2 Wires Cable)

Power supply

3 Phase 3 Wires

Power supply

1Phase 2Wires

(Main Switch)

R S T

Switch

ELCB

ELCB

34 34 34

Outdoor Unit

SODU B SODU A IDU B IDU A INT B INT A

ELECTRICAL WIRING

Field Wiring

WARNING

!

• Indoor Unit ground wires are required for preventing electrical shock accident during current
leakage, Communication disorder by noise effect and motor current leakage (without connec­tion to pipe).

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

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

• If there exists the possibility of reversed phase, lose phase, momentary blackout or the power
goes on and off while the product is operating, attach a reversed phase protection circuit locally.
Running the product in reversed phase may break the compressor and other parts.

Between Indoor and Outdoor unit

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

53

ENGLISH

ELECTRICAL WIRING

54

ENGLISH

Example) Connection of transmission wire

[BUS type] [STAR type]

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

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

Example) Connection of power and communication cable

Insulation sleeves
attachment

Power/
Ground cable

Power/
Ground cable

Communication
cable

Over 50mm gap

Main power
Terminal block
Ground wire

Fix firmly not to be
displaced

ODU-IDU
Communication cable

Hold power cable

Hold
communication
cable

Insulation sleeves
attachment

Power/
Ground cable

Power/
Ground cable

View A

A

Communication
cable

Over 50mm gap

Fix firmly not to be
displaced

ODU-IDU
Communication cable

Hold power cable

Communication
cable

Main power
Terminal block

Hold Communication
cable

Ground wire

Fix firmly
not to be
displaced

Over

50mm gap

Power/

Ground cable

Communication
cable

Over

50mm gap

Power/

Ground cable

Communication
cable

10HP

Right side Front side

8HP

Right side Front side

ELECTRICAL WIRING

55

ENGLISH

※Pictures may differ depending on the model.

ELECTRICAL WIRING

56

ENGLISH

Installation of IO Module(optional)

① Assemble IO Module and bracket.
② Fix the bracket on designated location with two clamp cords(105mm).
③ Connect the connection wires according to the instructions.

(Please refer to Setting and Using Method)

+

- About more information of IO Module, please refer to IO Module manual.

※Pictures may differ depending on the model.

CAUTION

!

Be sure to turn off outdoor unit power before installation.

+

ELECTRICAL WIRING

Checking the setting of outdoor units

Checking according to dip switch setting

- You can check the setting values of the Master outdoor unit from the 7 segment LED.
The dip switch setting should be changed when the power is OFF.

Checking the initial display
The number is sequentially appeared at the 7 segment in 5 seconds after applying the power.

This number represents the setting condition. (For example, represents R410A 10HP)

• Initial display order • Example) ARUN100BSS0

Order No Note

①

4~12 Model capacity

②

③

④

1 Cooling only

2 Heat pump
38 380V
46 460V
22 220V

1 Standard

5 Cold temperature area

6 Tropical

① ② ③ ④

10 2 22 1

57

ENGLISH

ELECTRICAL WIRING

DIP-SWITCH 7 - Segment

SW01C ( : confirm)

SW02C (ඔ : backward)

SW03C (ඖ : forward)

SW04C (

: cancel)

SW01D (reset)

58

ENGLISH

Automatic Addressing

The address of indoor units would be set by Automatic Addressing

- Wait for 3 minutes after supplying power.
(IDU and ODU should be off)

- Press RED button of the outdoor units for 5 seconds. (SW01C)

- A “88” is indicated on 7-segment LED of the outdoor unit PCB.

- For completing addressing, 2~7 minutes are required depending on numbers of connected in­door units

- Numbers of connected indoor units whose addressing is completed are indicated for 30 sec­onds on 7-segment LED of the outdoor unit PCB

- After completing addressing, address of each indoor unit is indicated on the wired remote con­trol display window. (CH01, CH02, CH03, ……, CH06 : Indicated as numbers of connected in­door units)

[Heat Pump (MAIN PCB)]

!

• In replacement of the indoor unit PCB, always perform Automatic addressing setting again (At
that time, please check about using Independent power module to any indoor unit.)

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

• Automatic Addressing has to be performed after 3 minutes to improve communication.

CAUTION

TheProcedureofAutomaticAddressing

• Automatic addressing setting end
Numbers of indoor unit connection set whose
addressing is completed are indicated for 30seconds
on 7-segment LED after completing setting

Indoor address number is displayed on wired remote control or
indoor unit display window. It is not an error message, will
disappeared when on/off button is pressed on remote control
ex) Display of 01, 02, ..., 15 means connection of 15 indoor units
and Automatic addressing is completed normally.

Automatic addressing start

Waiting 3 minutes

Power On

Press RED Button for 5 s

(SW01C)

7-segment LED = 88

Don’t press RED Button

(SW01C)

Waiting about 2~7 minutes

7-segment LED

OK

YES

NO Check the connections

of communication cable

= 88

ELECTRICAL WIRING

59

ENGLISH

ELECTRICAL WIRING

DIP-SW01 7 - Segment

SW01C (Ɨ : confirm)

SW02C (ȭ : backward)

SW03C (ȯ : forward)

SW04C (

: cancel)

SW01D (reset)

60

ENGLISH

Setting the function
Select the mode/function/option/value using ‘▶’, ‘◀’ Button and confirm that using the ‘●’ but-

ton after dip switch No.5 is turned on.

MODE FUNCTION OPTION VALUE ACTION

Con-

tent

In-

stalla-

tion

Display1

Content

Cool & Heat

Selector

Static pressure

compensation

Night low noise

ODU address

Snow removal &

rapid defrost

Target pressure

adjusting

Display2

Content Display3

op1~op2

op1~op3

op1~op15

selected the

option

selected the

option

selected the

option

oFF

oFF

oFF

-

op1~op3

op1~op6

selected the

option

selected the

option

oFF

oFF

Con-

Display4

tent

- -

- -

- -

-

0~254

- -

- -

Implement Display5

change the

set value

change the

set value

change the

set value

set the

change the

value

set value

change the

set value

change the

set value

blank

blank

blank

blank

blank

blank

MARK

save in

EEPROM

save in

EEPROM

save in

EEPROM

save in

EEPROM

save in

EEPROM

save in

EEPROM

* Functions save in EEPROM will be kept continuously, though the system power was reset.
* Dip switch 3 can be OFF except when installing the only 4 series indoor units

(named ARNU***4).

RE-

ELECTRICAL WIRING

SODU.B SODU.A IDU.B IDU.A CEN.B CEN.A DRY1 DRY2 GND 12V

B(D) A(C)

Group Number setting

Group Number setting for Indoor Units

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

- The communication cables connected to CEN.A and CEN.B terminal should be connected to
central control of Outdoor Unit with care for their polarity (A-A, B-B ).

- Turn the whole system on.

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

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

Outdoor Units (Main PCB)

Example) Group number setting

1 F

Group Indoor unit

st

1

number indicate the group number

2nd number point out indoor unit number

61

ENGLISH

Group recognizing the central controller

No.0 group (00~0F)
No.1 group (10~1F)
No.2 group (20~2F)
No.3 group (30~3F)
No.4 group (40~4F)
No.5 group (50~5F)
No.6 group (60~6F)
No.7 group (70~7F)
No.8 group (80~8F)
No.9 group (90~9F)
No. A group (A0~AF)
No. B group (B0~BF)
No. C group (C0~CF)
No. D group (D0~DF)
No. E group (E0~EF)
No. F group (F0~FF)

ELECTRICAL WIRING

Switch(up)

Switch(down)

Left side

Right side

62

ENGLISH

Cool & Heat selector

Mode setting method

Function setting

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn1” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“oFF”,“op1”,“op2” Push the ‘●’ button

Cool & Heat Selection mode is set

Switch control Function

Switch(up) Switch(down) oFF op1(mode) op2(mode)
Right side(on) Left side(off) Not operate Cooling Cooling
Right side(on) Right side(on) Not operate Heating Heating

Left side(off) - Not operate Fan mode Off

CAUTION

!

• Ask an authorized technician to setting a function.

• If do not use a function, set an off-mode.

• If use a function, first install a Cool & Heat selector.

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Static pressure compensation mode

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

Static pressure compensation mode setting method

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn2” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“op1~op3” Push the ‘●’ button

Start the Static pressure compensation mode :

Save the selected option value in EEPROM

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FAN Maximum RPM of each step

Capacity 8HP 10 / 12HP

Max. RPM

Standard 800 650

op1 850 700
op2 - 750

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Night Low Noise Function

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

Night low noise function setting method

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn3” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“op1~op15” Push the ‘●’ button

Start the Night low noise function :

Save the selected option value in EEPROM

Time Settings

Step

op1 8 9
op2 6.5 10.5
op3 5 12
op4 8 9
op5 6.5 10.5
op6 5 12
op7 8 9
op8 6.5 10.5

op9 5 12
op10 continuous operation
op11 continuous operation
op12 continuous operation
op13 6.5 10.5
op14 6.5 10.5
op15 6.5 10.5

CAUTION

!

• Request installer to set the function during installation.

• If ODU RPM changes, cooling capacity may go down.

Judgement

Time(Hr)

Operation

Time(Hr)

Setting the ODU address

Mode setting method

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

“Fn5” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“0” ~ “254” Push the ‘●’ button

ODU address is set

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CAUTION

!

• Ask an authorized technician to setting a function.

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

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Snow removal & rapid defrost

Mode setting method

Select the Function using ‘▶’, ‘◀’ Button :

“oFF”,“op1” ~ “op3” Push the ‘●’ button

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

“Fn6” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

Mode is set

Mode setting

Setting Mode

OFF Not setting

op1 Snow removal mode

op2 Rapid defrost mode

op3 Snow removal mode. + Rapid defrost mode.

CAUTION

!

• Ask an authorized technician to setting a function.

• If do not use a function, set an off-mode.

Target pressure adjusting

Mode setting method

Master unit PCB DIP switch on : No.5

Select the mode using ‘▶’, ‘◀’ Button :

“Func” Push the ‘●’ button

Select the Function using ‘▶’, ‘◀’ Button :

Select the Function using ‘▶’, ‘◀’ Button :

“Fn8” Push the ‘●’ button

“Fn8” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“HEAT” , “COOL” Push the ‘●’ button

Select the Option using ‘▶’, ‘◀’ Button :

“op1” ~ “op6” Push the ‘●’ button

Target pressure is set

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Setting

CAUTION

!

low pressure

(kPa)

Mode

off 778 2,990

op1 699 3,121

op2 739 2,827

op3 843 2,696

op4 908 2,565

op5 961 2,435

op6 1,026 2,304

• Ask an authorized technician to setting a function.

• If do not use a function, set an off-mode.

• Change a power consumption or capacity.

high pressure

(kPa)

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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 7­segment LED of outdoor unit control board as shown in the table.

- If more than two troubles occur simultaneously, lower number of error code is first displayed.

- After error occurrence, if error is released, error LED is also released simultaneously.

Error Display
1st,2nd,3rd LED of 7-segment indicates error number, 4th LED indicates unit number.
Ex)

Error No.

Display Title Cause of Error

0 1 - Air temperature sensor of indoor unit

0 2 -

0 3 -

0 4 - Drain pump Malfunction of drain pump

Inlet pipe temperature sensor of indoor
unit

Communication error : wired remote
controller ÷ indoor unit

Repeat

No. of Error Unit

No. of Error Compressor

Air temperature sensor of indoor unit is open or
short

Inlet pipe temperature sensor of indoor unit is open
or short

Failing to receive wired remote controller signal in
indoor unit PCB

0 5 -

0 6 -

Indoor unit related error

0 9 - Indoor EEPROM Error

1 0 - Poor fan motor operation

2 1 1

2 2 1

2 3 1

2 4 1 Outdoor Unit High Pressure Switch

Outdoor unit related error

2 5 1

* Refer to the Indoor manual for some Indoor Error code.

Communication error : outdoor unit ÷
indoor unit

Outlet pipe temperature sensor of in­door unit

Outdoor Unit Inverter Compressor IPM
Fault

Inverter Board Input Over
Current(RMS) of Outdoor Unit

Outdoor Unit Inverter Compressor DC
link Low Voltage

Outdoor Unit Input Voltage High/ Low
Voltage

Failing to receive outdoor unit signal in indoor unit
PCB

Outlet pipe temperature sensor of indoor unit is
open or short

In case when the serial number marked on EEP­ROM of Indoor unit is 0 or FFFFFF

Disconnecting the fan motor connector/Failure of in­door fan motor lock

Outdoor Unit Inverter Compressor Drive IPM Fault

Outdoor Unit Inverter Board Input Current excess
(RMS)

DC charging is not performed at Outdoor Unit after
starting relay turn on.

System is turned off by Outdoor Unit high pressure
switch.

Outdoor Unit input voltage is over 487V or below
270V

ELECTRICAL WIRING

Display Title Cause of Error

2 6 1

2 9 1

3 2 1

3 4 1 High Pressure of Outdoor Unit High Pressure of Outdoor Unit

3 5 1 Low Pressure of Outdoor Unit Low Pressure of Outdoor Unit

Outdoor Unit Inverter Compressor
Start Failure

Outdoor Unit Inverter Compressor
Over Current

Outdoor Unit Inverter Compressor1
High Discharge Temperature

The First Start Failure by Outdoor Unit Inverter Com­pressor Abnormality

Outdoor Unit Inverter Compressor Fault OR Drive
Fault

Outdoor Unit Inverter Compressor1 High Discharge
Temperature

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3 6 1

4 0 1

4 1 1

4 2 1

4 3 1

4 4 1

4 5 1

Outdoor unit related error

4 6 1

5 0 1

5 1 1 Excessive capacity of indoor units

5 2 1

5 3 1

5 7 1

6 0 1

6 2 1

6 5 1

Outdoor Unit Low Compression Ratio
Limited

Outdoor Unit Inverter Compressor CT
Sensor Fault

Outdoor Unit Inverter Compressor1
Discharge Temperature Sensor Fault

Outdoor Unit Low Pressure Sensor
Fault

Outdoor Unit High Pressure Sensor
Fault

Outdoor Unit Air Temperature Sen­sor Fault

Outdoor Unit Heat Exchanger Tem­perature Sensor (Front side) Fault

Outdoor Unit Suction Temperature
Sensor Fault

Omitting connection of R, S, T power
of Outdoor Unit

Communication error : inverter PCB
→ Main PCB

Communication error : indoor unit →
Main PCB of Outdoor Unit

Communication error : Main PCB →
inverter PCB

Inverter PCB EEPROM Error of Mas­ter Outdoor Unit

Outdoor Unit Inverter Heatsink High
Temperature

Outdoor Unit Inverter Heatsink Tem­perature Sensor Fault

Outdoor Unit Low Compression Ratio Limited

Outdoor Unit Inverter Compressor CT Sensor open
or short

Outdoor Unit Inverter Compressor Discharge Tem­perature Sensor open or short

Outdoor Unit Low Pressure Sensor open or short

Outdoor Unit High Pressure Sensor open or short

Outdoor Unit Air Temperature Sensor open or short

Outdoor Unit Heat Exchanger Temperature
Sensor(Front side) open or short

Outdoor Unit Suction Temperature Sensor open or
short

Omitting connection of outdoor unit

Excessive connection of indoor units compared to ca­pacity of Outdoor Unit

Failing to receive inverter signal at main PCB of Out­door Unit

Failing to receive indoor unit signal at main PCB of
Outdoor Unit.

Failing to receive signal main PCB at inverter PCB of
Outdoor Unit

Access Error of Inverter PCB of Outdoor Unit

System is turned off by Outdoor Unit Inverter
Heatsink High Temperature

Outdoor Unit Inverter Heatsink Temperature Sensor
open or short

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Display Title Cause of Error

6 7 1 Outdoor Unit Fan Lock Restriction of Outdoor Unit

7 1 1

8 6 1

1 1 3 1

1 1 5 1

Outdoor unit related error

1 5 1 1

Converter CT Sensor Error of Out­door Unit

Outdoor Unit Main PCB EEPROM
Error

Outdoor Unit Liquid pipe Tempera­ture Sensor Error

Outdoor Unit Subcooling Outlet
Temperature Sensor Error

Failure of operation mode conver­sion at Outdoor Unit Outdoor Unit

Converter CT Sensor open or short of Outdoor Unit

Communication Fail Between Outdoor Unit Main
MICOM and EEPROM or omitting EEPROM

Liquid pipe temperature sensor of Outdoor Unit is
open or short

Outdoor Unit Subcooling Outlet Temperature Sen­sor Error

Failure of operation mode conversion at Outdoor
Unit

CAUTION FOR REFRIGERANT LEAK

Amount of additional
replenished refrigerant

Total amount of replenished
refrigerant in refrigerant
facility (kg)

+

=

Note : In case one refrigerant facility is

divided into 2 or more refrigerant
systems and each system is
independent, amount of replenished
refrigerant of each system shall be
adopted.

Amount of replenished
refrigerant per one outdoor
unit system

Amount of replenished
refrigerant at factory shipment

Amount of additionally
replenished refrigerant
depending on piping
length or piping
diameter at customer

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Opening

Partition

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

Outdoor unit

(No.1 system)

Flow of
refrigerant

Indoor unit

Room where refrigerant leaks
(Refrigerant of the whole No.1
system flows out.)

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)

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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.

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

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

CAUTION FOR REFRIGERANT LEAK

(R410A)

=

Refrigerant concentration

(kg/m

3

)

Total amount of replenished
refrigerant in refrigerant facility (kg)

Capacity of smallest room where
indoor unit is installed (m

3

)

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.

Outdoor unit

Indoor unit

Smallest
room

Countermeasure 2

Gas leak alarm
Mechanical ventilator

Countermeasure 1

Opening effective to ventilation

Indoor unit

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

Calculate refrigerant concentration

In case the concentration exceeds the limit
When the concentration exceeds the limit, change original plan or take one of the countermea-

sures 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.

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

Sea wind

Sea wind

Sea wind

Windbreak

INSTALLATION GUIDE AT THE SEASIDE

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ENGLISH

CAUTION

!

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

• Do not install the product where it could
be exposed to sea wind (salty wind)
directly. It can result corrosion on the
product. Corrosion, particularly on the
condenser and evaporator fins, could
cause product malfunction or inefficient
performance.

• If outdoor unit is installed close to the
seaside, it should avoid direct exposure
to the sea wind. Otherwise it needs
additional anticorrosion treatment on the
heat exchanger.

Selecting the location(Outdoor Unit)

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

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

- It should be strong enough like concrete to
prevent the sea wind from the sea.

- The height and width should be more than
150% of the outdoor unit.

- It should be keep more than 70 cm of space
between outdoor unit and the windbreak for
easy air flow.

Select a well-drained place.

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

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1. Não ê recomendável o descarte de. pilhas, baterias em lixo comum.
Após o uso, estes itens devem ser descartados de forma adequada, sob pena de
ocasionarem danos ao meio ambiente e à saúde humana.

2. A LG criou o Programa Coleta Inteligente, para facilitar e viabilizar o descarte ade­quado de parelhos celulares, pilhas e baterias.

3. Através do Programa Coleta Inteligente, a LG disponíbiliza pontos de coleta em
localidades diversas, incluindo assistências técnicas autorizadas da LG Electron­ics. Para mais informações visite o site www.lge.com/br/coleta-seletivaou contate
nosso SAC através do número 4004-5400 (Capitais e Regiòs metropolitanas) ou
0800-707-5454 (demais localidades).