LG ARUN50LL2 INSTALLATION INSTRUCTIONS

INSTALLATION MANUAL

AIR CONDITIONER

• Please read this installation manual completely before installing the product.

• Installation work must be performed in accordance with the national
wiring standards by authorized personnel only.

• Please retain this installation manual for future reference after reading
it thoroughly.your set and retain it for future reference.

P/NO : MFL46912305

www.lg.com

MODELS: ARUV Series
ARUN Series

ENGLISH

ITALIANO ESPAÑOL

FRANÇAIS DEUTSCH

PORTUGUESE

2 Outdoor Unit

ARUV/ARUN Series Outdoor unit Installation Manual

TABLE OF CONTENTS

Safety Precautions.................................................................................................3

Installation Process ...............................................................................................7

Outdoor units Information.....................................................................................8

Environment-friendly Alternative Refrigerant R410A ........................................9

Select the Best Location........................................................................................9

Installation Space.................................................................................................10

Lifting method ......................................................................................................12

Installation ............................................................................................................13

Refrigerant piping installation ............................................................................17

Electrical Wiring ...................................................................................................35

Test Run ................................................................................................................48

Caution For Refrigerant Leak..............................................................................56

Installation guide at the seaside.........................................................................58

Safety Precautions

ENGLISH

Installation Manual 3

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must
be followed.
n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is

classified by the following indications.

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

This symbol indicates the possibility of death or serious injury.

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

Be sure not to do.

Be sure to follow the instruction.

n Installation

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

• If the power source capacity is inadequate or
electric work is performed improperly, electric
shock and fire may result.

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 typhoons and other strong winds
and earthquakes and install the unit at the
specified place.

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

Do not install the product on a defective
installation stand.

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

Safety Precautions

4 Outdoor Unit

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

• If a differnet refrigerant or air is mixed with the
original refrigerant, the refrigerant cycle may
malfunction and the unit may be gamaged.

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

• If the pressure switch, thermal switch, or other
protection device is shorted and operated
forcibly, or parts other than those specified by
LGE are used, fire or explosion may result.

Ventilate before operating air conditioner
when gas goes out.

• It may cause explosion, fire, and burn.

Securely install the cover of control box and
the panel.

• If the cover and panel are installed securely,
dust or water may enter the outdoor unit and fire
or electric shock may result.

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

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

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

•

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

■ Operation
Do not damage or use an unspecified power

cord.

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

Use a dedicated outlet for this appliance.

• There is risk of fire or electrical shock.

Be cautious that water could not enter the
product.

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

Do not touch the power switch with wet
hands.

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

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

• There is risk of fire or electric shock.

Be cautious not to touch the sharp edges
when installing.

• It may cause injury.

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

• This could result in personal injury and product
damage.

Do not open the inlet grill of the product dur­ing operation. (Do not touch the electrostatic
filter, if the unit is so equipped.)

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

Installation Manual 5

ENGLISH

Safety Precautions

n 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
surfficient protection against noise.

•

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

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

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

n 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 is not 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, and personal injury.

Safety Precautions

6 Outdoor Unit

Be very careful about product transportation.

• Only one person should not carry the product if it weighs more than 20 kg.

• Some products use PP bands for packaging. Do not use any PP bands for a means of transportation.
It is dangerous.

• Do not touch the heat exchanger fins. Doing so may cut your fingers.

• When transporting the Outdoor Unit, suspending it at the specified positions on the unit base. Also
support the Outdoor Unit at four points so that it cannot slip sideways.

Safely dispose of the packing materials.

•

Packing materials, such as mails and other metal
or wooden parts, may cause stabs or other injuries.

•

Tear apart and throw away plastic packaging bags
so that children will not play with them. If children
play with a plastic bag which was not torn apart,
they face the risk of suffocation.

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

• Starting operation immediately after turning on
the main power switch can result in severe
damage to internal parts. Keep the power switch
turned on during the operational season.

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

• It can cause a burn or frostbite.

Do not operate the air conditioner with the
panels and guards removed.

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

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

• Wait at least more than 5 minutes before turning
off the main power switch. Otherwise it may
result in water leakage or other problems.

Auto-addressing should be done in condition of
connecting the power of all indoor and outdoour
units. Auto-addressing should also be done in
case of changing the Indoor Unit board(PCB).

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

• Be careful and avoid personal injury.

Do not insert hands or other objects through
the air inlet or outlet while the air conditioner
is plugged in.

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

Install and insulate the drain hose to ensure
that water is drained away properly based on
the installation manual.

• A bad connection may cause water leakage.

Do not operate with "System louver" closed.

• It may cause failure of appliance or accident.

Installation

Installation Process

The foundation must be level even

Outdoor unit foundation work

Avoid short circuits and ensure
sufficient space is allowed for service

Installation of outdoor unit

Refer to automatic addressing flowchart

Automatic addressing of indoor unit

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

2

) there must be no drop in pressure.

Airtight test

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

Electrical work

(connection circuits and drive circuits)

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

Heat insulation work

Make sure airflow is sufficient

Duct work

Adjust to downward gradient

Drain pipe work

Special attention to dryness,
cleanness and tightness

Refrigerant piping work

Check model name to make
sure the fitting is made correctly

Installation of indoor unit

Take account of gradient
of drain piping

Sleeve and insert work

Make relationship between outdoor, indoor, remote controller, and option connections clear.
(Prepare control circuit diagram)

Preparation of contract drawings

Indicate clearly who is to be responsible for switch settings

Determination of division work

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

Vacuum drying

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

Additional charge of refrigerant

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

Fit facing panels

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

Test run adjustment

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

Transfer to customer with explanation

Preheat the crank case with the electrical heater for more than 6 hours.

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

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

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

ENGLISH

Installation Manual 7

8 Outdoor Unit

Outdoor units Information

Outdoor units Information

CAUTION: Ratio of the connectable Indoor Units to the Outdoor: Within 50 ~ 130%

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

Power Supply: Outdoor Unit (3Ø, 380~415V, 50Hz / 3Ø, 380V, 60Hz)

Connectable Indoor Unit

Model

HP(Equivalent horsepower)

Chassis

Refrigerant

Product charge kg

CF(Correction Factor)

kg

Max. Connectable No. of Indoor Units

Net Weight kg

Dimensions (WxHxD)

mm

inch

Connecting Pipes

Liquid Pipes

[mm(inch)]

Gas Pipes

[mm(inch)]

ARUN50LR2
ARUN50LL2

5

UV

5.2

0

8

200

750x1,790x650

29.5x70.5x25.6

9.52(3/8)

15.88(5/8)

ARUN60LR2

ARUN60LL2

6

UV

5.2

0

9

200

750x1,790x650

29.5x70.5x25.6

9.52(3/8)

19.05(3/4)

ARUN80LR2
ARUN80LL2

8

UV

6.4

0

13

200

750x1,790x650

29.5x70.5x25.6

9.52(3/8)

19.05(3/4)

should be connected with "2 series" indoor unit only.

Ex) ARNU07GSEA2

n Heat Pump

Model

HP(Equivalent horsepower)

Chassis

Refrigerant

Product charge kg

CF(Correction Factor)

kg

Max. Connectable No. of Indoor Units

Net Weight kg

Dimensions (WxHxD)

mm

inch

Connecting Pipes

Liquid Pipes

[mm(inch)]

Gas Pipes

[mm(inch)]

ARUV80LR2 ARUV100LR2
ARUV80LL2 ARUV100LL2

810

UV1 UV

4.5 5.1

00

13 16

175 190

750 x 1,790 x 495 750x1,790x650

29.5 x 70.5 x 19.5 29.5x70.5x25.6

9.52(3/8) 9.52(3/8)

19.05(3/4) 22.2(7/8)

n Cooling Only

ENGLISH

Installation Manual 9

Environment-friendly Alternative Refrigerant R410A

Select the Best Location

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

• No direct thermal radiation from other heat sources

• No possibility of annoying the neighbors by noise from unit

• No exposition to strong wind

• With strength which bears weight of unit

• Note that drain flows out of unit when heating

• With space for air passage and service work shown next

• Because of the possibility of fire, do not install unit to the space where generation, inflow, stagnation, and leak
of combustible gas is expected.

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

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

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

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

- Make the foundation as high as possible.

- Fit a snow protection hood.

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

1. Install the outdoor unit at a place well ventilated and having a lot of sunshine in case of installing the prod-

uct at a place with a high humidity in winter (neare beach, coast, lake, etc).
(Ex) Rooftop where sunshine always shines.

2. Performance of heating will be reduced and preheat time of the indoor unit may be lengthened in case of

installing the outdoor unit in winter at following location:
(1) Shade position with a narrow space
(2) Location with much moisture in neighboring floor.
(3) Location with much humidity around.
(4) Location where water gathers since the floor is not even.

• 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 environmental-friendly refrigerant and encour­aged to use it widely to prevent environmental pollution.

Environment-friendly Alternative Refrigerant R410A

CAUTION:

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

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

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

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

• Do not heat up pipes more than its necessity to prevent them from softening.

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

10 Outdoor Unit

Installation Space

Installation Space

• Space for the "*" display part of by type of system louver
When installing automatic louver: 150
When installing manual louver: 150
When installing fixed louver: 100 (Basic space)

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

• A water drain outlet is required to discharge rain water on the bottom of the outdoor unit room or

condensation water to possibly generate when operating.

• The recommended Specification of louver

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

CAUTION:

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

(Unit : mm)

65 596 40

954

137

650

(Min) 884 (+5)

UV : 1150
UV1 : 995

Door Width

UV : 900

UV1 : 745

660

500

(600)

676

100 (Min) * 100 (Min)

(Min) 1605 (+5)

1024

90

723(Anchor Bolt)

750

Drain hole

Drain pipe

660mm

550mm970mm

85mm

Installation Space

ENGLISH

Installation Manual 11

Cautions in winter especially for seasonal wind

• Sufficient measures are required at a snow area or severe cold area in winter so that product can be operated
well.

• Get ready for seasonal wind or snow in winter even in other area.

• Install the outdoor unit not to come in contact with snow directly. If snow piles up and freezes on the air suction
hole, the system may malfunction.

• Don't install the suction hole and discharge hole of the outdoor unit facing to the seasonal wind.

W

H

N

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

Ad + As

Af

X 100

ho

h

θ

θ

E.O.R > 120%

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

• ho = h * COSθ

• Total Area(A) = H * W

• Effective Area(Af) = ho * W * N

• Opening Ratio(n) = Af/A
→ Af = A * n

E.O.R(%) =

Af

Ad + As

12 Outdoor Unit

Lifting Method

• When carrying the unit suspended, pass the ropes under the unit and use the two suspension points each at
the front and rear.

• Always lift the unit with ropes attached at four points so that impact is not applied to the unit.

• Attach the ropes to the unit at an angle of 40° or less.

Lifting method

CAUTION

Be very careful to carry product.

• Do not have only one person carry product if it is more than 20 kg.

• PP bands are used to pack some products. Do not use them as a mean for transportation because they
are dangerous.

• Do not touch heat exchanger fins with your bare hands. Otherwise you may get a cut in your hands.

• Tear plastic packaging bag and scrap it so that children cannot play with it. Otherwise plastic packaging
bag may suffocate children to death.

• When carrying in Outdoor Unit, be sure to support it at four points. Carrying in and lifting with 3-point
support may make Outdoor Unit unstable, resulting in a fall of it.

• Use 2 belts of at least 8 m long.

• Place extra cloth or boards in the locations where the casing comes in contact with the sling to prevent
damage.

• Hoist the unit making sure it is being lifted at its center of gravity.

40° or less

A

Rope suspension point

B

WARNING

ENGLISH

Installation Manual 13

Installation

Installation

Location of anchor bolt

n Installation foot (Location of anchor bolt)

Foundation for Installation

• Fix the unit tightly with bolts as shown below so that unit will not fall down due to earthquake or gust.

• Use the H-beam support as a base support

• Noise and vibration may occur from the floor or wall since vibration is transferred through the installation
part depending on installation status. Thus, use anti-vibration materials (Anti-vibration pad) fully (The base
pad shall be more than 200mm).

A

B

D

E

F

G

C

Ensure that the corner part can be securely mounted. Otherwise, the support for
installation may be bent.

Obtain and use the M10 anchor bolt.
The corner was not properly mounted.
Outdoor unit (Insert the cushion pad between outdoor unit and base support to ensure that

anti-vibration may be done in a wide area)
Pipe and wiring space (in case of piping and wiring on the floor surface)
H-Beam support
Concrete base support

Foundation bolt executing method

200

Nut

75

75

200

Spring washer

Frame

Anti-vibration

materials

Four bolt are
required
3 thread ridges

H-Beam

Concrete

base

100

WARNING

• Be sure to install unit in a place strong enough to withstand its weight.
Any lack of strength may cause unit to fall down, resulting in a personal injury.

• Have installation work in order to protect against a strong wind and earthquake. Any installation
deficiency may cause unit to fall down, resulting in a personal injury.

• Especially take care for support strength of the floor surface, water drain processing (processing of
water flown out from the outdoor unit during operation) and paths of the pipe and wiring when mak­ing a base support.

• Don't use a tube or pipe for water drain in the base pan and perform water drain processing by
using the drain path. Water drain may not be done due to freezing of a tube or pipe.

(Unit : mm)

723

UV : 516

UV1 : 362

G

14 Outdoor Unit

Installation

Preparation of Piping

1) Cut the pipes and the cable.

n Use the accessory piping kit or the pipes purchased

locally.

n Measure the distance between the indoor and the out-

door unit.

n Cut the pipes a little longer than measured distance.
n Cut the cable 1.5m longer than the pipe length.

2) Burrs removal

n Completely remove all burrs from the cut cross section

of pipe/tube.

n Put the end of the copper tube/pipe to downward direc-

tion as you remove burrs in order to avoid to let burrs
drop in the tubing.

3) Flaring work

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

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

4) Check

n Compare the flared work with figure below.
n If flare is noted to be defective, cut off the flared section

and do flaring work again.

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

Pipe " A " (mm)

Gas Liquid Gas

Liquid

<5.6(19,100) 1/2" 1/4" 0.5~0.8 0~0.5
<16.0(54,600) 5/8" 3/8" 0.8~1.0 0.5~0.8
<22.4(76,400) 3/4" 3/8" 1.0~1.3 0.5~0.8

Indoor unit
[kW(Btu/h]

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 =

ENGLISH

Installation Manual 15

Installation

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.

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.

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.

Tightening torque

Union

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.

Opening shutoff valve

Closing shutoff valve

FLARE SHAPE and FLARE NUT TIGHTENING TORQUE

Shutoff

valve size

Ø6.4
Ø9.5

Ø12.7

Ø15.9

Ø22.2
Ø25.4

13.5~16.5

18~22

14~17
33~39
50~60

62~75

23~27

13.5~16.5

5.4~6.6

Hexagonal

wrench 4mm

Hexagonal

wrench 6mm

Hexagonal

wrench 10mm

8.1~9.9

27-33 36~44

-

11.5-13.9

22~28-

Tightening torque (N.m)(Turn clockwise to close)

Shaft(valve body)

Gas line piping attached to unit

Cap(Valve lid) Service port Flare nut

90°

±2

45

°

±

2

A

R=0.4~0.8

pipe size tightening torque(N.m) A(mm) flare shape

Ø9.5 3.27~3.99 12.8~13.2

Ø12.7 4.95~6.30 16.2~16.6

Ø15.9 6.18~7.54 19.3~19.7

16 Outdoor Unit

Installation

1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over
120°C).

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

• Heat insulation material to be prepared... EPDM
(Ethylene Propylene Diene Methylene)-over 120°C
the heat-resistance temperature.

• Add the insulation over 10mm thickness at high humidity environment.

Indoor unit

Thermal insulator
(accessory)

Fastening band
(accessory)

Refrigerant piping

HEAT INSULATION

ENGLISH

Installation Manual 17

Refrigerant piping installation

WARNING

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

Refrigerant piping installation

WARNING

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

Cautions in pipe connection/valve operation

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

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

CLOSE OPEN

① Pipe joint (auxiliary parts): Securely perform brazing with

a nitrogen blow into the service valve port.(Releasing
pressure : 0.02 MPa or less)

② Flare nut: Loose or tighten flare nut by using the wrench

with both ends. Coat the flare connection part with oil for
the compressor.

③ Cap: Remove caps and operate valve, etc. After opera-

tion, always reattach caps (tightening torque of valve
cap: 25N.m (250kgf.cm) or more). (Don't remove the
internal part of the port)

④ Service port: Make the refrigerant pipe vacuum and

charge it using the service port. Always reattach caps
after completing work (tightening torque of service cap:
14N.m (140kgf.cm) or more).

⑤ Liquid pipe

⑥ Gas pipe

Ball Valve(Gas Pipe)

≥ 22.2 : brazing type

≤19.05 : flare type

Ball Valve(Liquid Pipe)

18 Outdoor Unit

Refrigerant piping installation

To Outdoor Unit

Sealed Piping

A

A

B

A
B

1. Use the following materials for refrigerant piping.

• Material: Seamless phosphorous deoxidized copper pipe

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

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

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

3. Use care to prevent dust, water or other contaminants from entering the piping during installation.

4. Reduce the number of bending portions as much as possible, and make bending radius as big as possible.

5. Always use the branch piping set shown below, which are sold separately.

6. If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut
the connecting section and then use an adapter for connecting different diameters to connect the piping.

7. Always observe the restrictions on the refrigerant piping (such as rated length, difference in height, and
piping diameter).
Failure to do so can result in equipment failure or a decline in heating/cooling performance.

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

9. The Multi V will stop due to an abnormality like excessive or insufficient refrigerant. At such a time, always
properly charge the unit. When servicing, always check the notes concerning both the piping length and
the amount of additional refrigerant.

10. Never perform a pump down. This will not only damage the compressor but also deteriorate the

performance.

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

Caution

ARBLN01621 ARBLN03321 ARBL054 ARBL057 ARBL1010

Y branch

Header

4 branch 7 branch 10 branch

0.99

22.2

1.1

31.8

1.21

34.9

1.35

38.1

1.43

41.3

0.99

28.58

0.99

25.4

0.99

19.05

0.99

15.88

0.8

12.7

0.8

9.52

0.8

6.35

Minimum

thickness [mm]

Outer diameter

[mm]

ENGLISH

Installation Manual 19

Refrigerant piping installation

WARNING

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

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

- After selecting diameter of the refrigerant pipe to suit total capacity of the indoor unit connected after
branching, use an appropriate branch pipe set according to the pipe diameter of the indoor unit and the
installation pipe drawing.

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

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

13. When connecting the refrigerant piping, make sure the service valves of the Outdoor Unit is completely
closed (the factory setting) and do not operate it until the refrigerant piping for the Outdoor and Indoor
Units has been connected, a refrigerant leakage test has been performed and the evacuation process
has been completed.

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

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

6

1

2

45

3

20 Outdoor Unit

Refrigerant piping installation

Selection of Refrigerant Piping

Selection of pipe sizeName

Size of main pipe

Pipe size of between branching sections

Connecting pipe size of indoor unit

Piping partsNo.

Outdoor unit

↓

1st branching section

Branching section

↓

Branching section

Branching section

↓

Indoor unit

Main pipe

①

②

③

Branching pipe

Indoor unit

connecting pipe

Outdoor unit capacity type

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

5HP Ø9.52(3/8) Ø15.88(5/8)

6, 8HP Ø9.52(3/8) Ø19.05(3/4)

10HP Ø9.52(3/8) Ø22.2(7/8)

Indoor unit capacity[kW(Btu/h)]

Liquid pipe Gas pipe

[mm(inch)] [mm(inch)]

≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)

< 16.0(54,000) Ø9.52(3/8) Ø15.88(5/8)

Indoor unit capacity[kW(Btu/h)]

Liquid pipe Gas pipe

[mm(inch)] [mm(inch)]

≤ 5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
< 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

Outdoor unit

Gas pipe

Main pipe

Liquid pipe

Branching

Branching

pipe

pipe

Indoor unit

ENGLISH

Installation Manual 21

• * :

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

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

Refrigerant piping installation

u Y branch method

Refrigerant piping system

Example : 5 Indoor Units connected

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

L150m

l 40m

H 50m

h 15m

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

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

L

l

H

h

22 Outdoor Unit

Refrigerant piping installation

u Header Method

Example : 6 Indoor Units connected

Ⓐ : Outdoor Unit

Ⓑ : 1st branch

Ⓒ : Indoor Units

Ⓓ : Sealed piping

L 150m

40m

H 50m

h 15m

Branch pipe can not be used after header

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

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

L

l

H

h

• * :

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

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

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.

ENGLISH

Installation Manual 23

Refrigerant piping installation

u Combination of Y branch/header method

Example : 5 Indoor Units connected

Ⓐ : Outdoor Unit

Ⓑ : 1st branch (Y branch)

Ⓒ : Y branch

Ⓓ : Indoor Unit

Ⓔ : Header

Ⓕ : Sealed piping

L150m

40m

H 50m

h 15m

Branch pipe can not be used after header

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

• * :

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

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

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

L

l

H

h

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

Downward Indoor Unit total capacity

[kW(Btu/h)]

≤5.6(19,100) Ø6.35(1/4) Ø12.7(1/2)

<16(54,600) Ø9.52(3/8) Ø15.88(5/8)

<22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)

< 33(112,600) Ø9.52(3/8) Ø22.2(7/8)

Liquid pipe

[mm(inch)]

Gas pipe

[mm(inch)]

24 Outdoor Unit

Refrigerant piping installation

u The Amount of Refrigerant

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

Additional charge (kg)

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

=
+
+

+
+

+

+=

+

Total liquid pipe (m): Ø22.2mm

x 0.354(kg/m)

x 0.266(kg/m)

x 0.173(kg/m)

x 0.118(kg/m)

x 0.061(kg/m)

x 0.022(kg/m)

Total liquid pipe (m): Ø19.05mm

Total liquid pipe (m): Ø15.88mm

Total liquid pipe (m): Ø12.7mm

Total liquid pipe (m): Ø9.52mm

Total liquid pipe (m): Ø6.35mm

CF(kg)

(Correction Factor)

Total amount(kg)

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

A

A B

B

CAUTION

B B B

BB

A

B

C

X

b

a

c d

34 5

21

e

Outdoor Unit
Indoor Unit
A : ø9.52, 40m
B : ø9.52, 20m
C : ø9.52, 20m

Ex

Additional Charge = A x 0.061 + B x 0.061 + C x 0.061
+ (a+b+c+d+e) x 0.022 + CF

= 40 x 0.061 + 20 x 0.061 + 20 x 0.061

+ (10 x 5) x 0.022 - 0 (CF)

= 5.98(kg)

a : ø6.35, 10m
b : ø6.35, 10m
c : ø6.35, 10m
d : ø6.35, 10m
e : ø6.35, 10m

u Special condition

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

n Additional refrigerant charging amount (kg) : Ⓒ

= (A x

α+ B x ß) - (AVG x ß)

• A = Total No. of TQ,TR,SE and SF Indoor units,

α= 0.5

• B = Total No. of except TE,SE and SF Indoor units, ß = 0.3

• AVG = 50% of Max. No. of connectable Indoor units.

Example)

1) Installation Information

- Outdoor unit : 6HP

- Total indoor units : 6 units (TQ 3 units, SE 2 units, BH 1 unit)

2) Information from PDB

- Max. No. of connectable indoor units : 9 units

- Calculated additional refrigerant amount = 2 kg : Ⓑ

3) Indoor refrigerant charging amount

= (5 units x 0.5+1 unit x 0.3) - (5 units x 0.3) = 1.3 kg : Ⓒ

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

= 3.3 kg

Total amount(kg)

+=

AB+C

ENGLISH

Installation Manual 25

Refrigerant piping installation

WARNING

▶ Regulation for refrigerant leakage

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

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

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

1. Installation of effective opening part

2. Reconfirmation of Outdoor Unit capacity and piping length

3. Reduction of the amount of refrigerant

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

- Change Indoor Unit type
: installation position should be over 2m from the floor (Wall mounted type ’ Cassette type)

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

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

Total amount of refrigerant in the system

≤ 0.44 ( kg / m

3

)

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

26 Outdoor Unit

Refrigerant piping installation

1. Line Distribution

2. Vertical Distribution

Ensure that the branch pipes are attached vertically.

3. The others

Header

1st

1st

1st

Main pipe

Distribution

2nd

2nd

3rd

2nd

Main pipe

Distribution

1st

3rd

3rd main pipe distribution

2nd

Distribution Method

ENGLISH

Installation Manual 27

Refrigerant piping installation

Branch pipe Fitting

Y branch

A

B

To Outdoor Unit
To Branch Piping or Indoor Unit

A

B

Facing

upwards

Facing

downwards

Viewed from point A
in direction of arrow

Horizontal
plane

Within +/- 10°

A

A

B

Header

To outdoor unit
To indoor unit

A

B

C

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

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

• The indoor unit having larger capacity must be
installed closer to Ⓐ than smaller one.

• If the diameter of the refrigerant piping selected
by the procedures described is different from
the size of the joint,

the connecting section

should be cut with a pipe cutter.

ⓒ Pipe cutter

28 Outdoor Unit

Refrigerant piping installation

• 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.

• Fit branch pipe lie in a horizontal plane.

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

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

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

B

Pinched pipe

Horizontal plane

View from point B in the direction of the arrow

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

Insulator

Insulator of field pipe

Tape

Tape

Cap pipe

Insulator for cap pipe

ENGLISH

Installation Manual 29

Refrigerant piping installation

1. Y Branch

Selection of Y Branch and Header

Models Gas pipe Liquid pipe

ARBLN01621

ARBLN03321

ARBLN07121

I.D12.7

I.D15.88

I.D19.05

1

I.D25.4

O.D19 .05

3

1

I.D31.8

I.D28.58

2

O.D22.2

O.D15 .88

I.D28.58

I.D22.2

70 80 110

I.D34.9

I.D31.8

120 90

390
413

376
404

O.D31.8

281
292

O.D25.4

I.D12.7

I.D15.88

I.D15.88

74

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

83

I.D12.7

3

I.D22.2

I.D25.4

I.D15.88

2

8

96

I.D12.7

3

I.D22.2

I.D28.58

120 110 70

I.D15.88

O.D19 .05

1 2

I.D19.05

O.D19 .05

1 3

I.D12.7

I.D19.05

2.22D.I85.82D.I

I.D19.05

I.D15.8

I.D12.7

3

I.D.6.35

1

1

I.D12.7

I.D19.05

I.D9.52

7070

I.D15.88

O.D9. 52

281
292

321
332

371
394

I.D9.52

I.D.9.52

I.D12.7

I.D9.52

I.D12.7

I.D6.35

I.D9.52

I.D19.05

I.D15.88I.D12.7

I.D12.7

I.D15.88 I.D19.05

O.D12 .7I.D6.35

2

[unit:mm]

I.D6.35

I.D.6.35

I.D12.7

2

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

74

53.6D.I25.9D.I

7

4

83

3

I.D34.9

I.D34.9

O.D34 .9

3

I.D28.58

I.D22.2

I.D28.58I.D38.1

2

I.D22.2

3

I.D41.3

I.D19.05

I.D15.88 I.D19.05

1

125

I.D22.2

O.D15.88 I.D9.52

2 3 3

ARBLN14521

I.D41.3

I.D34.9

I.D38.1

I.D15.88

I.D19.05

3

O.D22.2

120 130

I.D12.7

3

O.D15 .88

471
517

I.D41.3 I.D38.1

O.D38 .1

2

90
O.D28 .58

2

For example. Indicated Ø9.52 is the outer diameter(O.D..) of field jointed piping

I.D19.05

I.D22.2

I.D15.88

I.D19.05

416
444

I.D12.7

110 110

O.D19 .05

80

I.D22.2

I.D9.52

O.D12.7 I.D6.35

I.D15.88

2

I.D12.7

96

3

30 Outdoor Unit

Refrigerant piping installation

2. Header

[unit:mm]

Models Gas pipe Liquid pipe

80

OD12.7ID9.52

75

120

150

320

60*3=180

ID9.52

ID9.52

ID6.35

ID6.35

ID12.7

60*3=180

120

150

320

75

120

OD28.58

ID25.4

ID22.2

ID15.88

ID12.7

ID28.58

ID19.05

ID15.88

4 branch

ARBL054

7 branch

ARBL057

4 branch

ARBL104

7 branch

ARBL107

10 branch

ARBL1010

10 branch

ARBL2010

120

150

320

7560*3=180

ID15.88

ID12.7

ID12.7

ID15.88

ID19.05

120

80

OD19.05

ID15.88

ID12.7

OD12.7

75

120

150

320

60*3=180

ID9.52

ID9.52

ID9.52

ID6.35

ID6.35

ID12.7

120

150

75

60*6=360

500

ID19.05

ID15.88

ID12.7

ID15.88

ID12.7

120

OD19.05

ID15.88

ID12.7

120

150

60*6=360

500

75

ID6.35

ID9.52

ID12.7

120

150

75

60*6=360

500

ID28.58

ID19.05

ID15.88

ID15.88

ID12.7

120

OD28.58

ID25.4

ID22.2

120

150

60*6=360

500

75

ID6.35

ID9.52

ID12.7

ID9.52

ID6.35

80

OD12.7ID9.52

120

150

75

60*9=540

680

ID28.58

ID19.05

ID15.88

ID15.88

ID12.7

120

150

75

60*9=540

680

ID6.35

ID9.52

ID12.7

120

OD28.58

ID25.4

ID22.2

ID9.52

ID6.35

80

OD12.7ID9.52

80

OD19.05

ID15.88

120

150

127

60*9=540

700

ID38.1

ID3.18

ID19.05

ID15.88

ID15.88

ID12.7

120

OD38.1

ID34.9

ID28.58

120

150

127

60*9=540

700

ID6.35

ID9.52

ID19.05

ID15.88

ID9.52

ID6.35

80

OD12.7

ID9.52

ENGLISH

Installation Manual 31

Refrigerant piping installation

Leak Test and Vacuum

(1) Leak test

Leak test should be m

ade by pressurizing nitrogen gas to 3.8 MPa(38.7kgf/cm2). If the pressure does not drop for
24 hours, the system passes the test. If the pressure drops, check where the nitrogen leaks. For the test method,
refer to the following figure. (Make a test with the service valves closed. Be also sure to pressurize liquid pipe, gas
pipe and high/low pressure common pipe)
The test result can be judged good if the pressure has not be reduced after leaving for about one day after com­pletion of nitrogen gas pressurization.
During this test, set DIP switch as Vacuum Mode.

Note:

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

There is a pressure change of approximately 0.1 kgf/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.

Gas pipe

Nitrogen gas

Liquide pipe

cylinder

32 Outdoor Unit

Refrigerant piping installation

(2) Vacuum

Vacuum drying should be made from the service port provided on the outdoor unitʼs service valve to the vac­uum pump commonly used for liquid pipe, gas pipe. Vaccum of the pipe and the indoor units should be
made from the port of the outdoor unit's service valve with the service valve closed.
* Never perform air purging using refrigerant.

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

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

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

WARNING

• If the primary charging is not performed after vacuum, wet air may go into the outdoor unit. If air is mixed with the
refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.

• Charging of refrigerant while the compressor is working is prohibited. Otherwise, liquid may go into the compres­sor. It may cause faults of the compressor.

• Use a gravimeter accurate to 0.1kg.

• If other refrigerants are mixed in the original refrigerant, a refrigerant cycle may cause malfunction or damage.

• Add accurate refrigerant quantity via calculation.
Too much or too little refrigerant may cause problems

• Repeated on and off of the indoor units without charging refrigerant may cause faults of EEV.

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

Vacuum pump

Gas pipe

Liquide pipe

ENGLISH

Installation Manual 33

Refrigerant piping installation

Vacuum Mode

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

Master main PCB DIP switch ON ( No.11,14)

Vacuum mode setting

ODU V/V OPEN

Main EEV, SC EEV OPEN

IDU EEV OPEN

ODU power reset

Press the black button Main PCB (5 sec.)

Main PCB
SW01S

Main PCB
SW02B

Main PCB
SW01V

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

Vacuum mode setting method Vacuum mode cancellation method

Master main PCB DIP switch OFF( No.11,14)

Power reset

Vacuum mode cancellation

Caution

34 Outdoor Unit

Refrigerant piping installation

Thermal Insulation of refrigerant piping

Heat

insulation

material

Outer

covering

Adhesive + Heat - resistant polyethylene foam +
Adhesive tape

Indoor Vinyl tape
Floor exposed

Water-proof hemp cloth + Bronze asphalt

Outdoor

Water-proof hemp cloth + Zinc plate + Oily paint

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

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

• Be sure to fully insulate connecting portion.

Liquid pipe
Gas pipe
Power lines
Finishing tape
Insulating material

Bad example

Good example

These parts are not insulated.

B A C

A
B
C

A

C

D

E

A
B
C
D
E

Communication lines

F

Liquid pipe

Communication lines

Communication lines

Separation

Gas pipe
Power lines
Insulating material

A
B
C
D
E

A

A

B

F

Heat insulation material
Pipe
Outer covering

(Wind the connection part and cutting part of
heat insulation material with a finishing tape.)

Power lines

E

D

D

B

A

C

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.

1m1m

A

B

D

F

G

B

G

D

B

H

I

J

A

E

B

I

A

B

D

C

Inner wall (concealed)

Floor (fireproofing)

Penetrating portion on fire

limit and boundary wall

Roof pipe shaft

Outer wall Outer wall (exposed)

Penetrations

Sleeve
Heat insulating material
Lagging
Caulking material
Band
Waterproofing layer
Sleeve with edge
Lagging material
Mortar or other incombustible caulking
Incombustible heat insulation material

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

ENGLISH

Installation Manual 35

Electrical Wiring

CAUTION

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

• Never use multi-core cable

• As this unit is equipped with an inverter, to install a phase leading capacitor not only will deteriorate
power factor improvement effect, but also may cause capacitor abnormal heating. Therefore, never
install a phase leading capacitor.

• Keep power imbalance within 2% of the supply rating. Large imbalance will shorten the life of the
smoothing capacitor.

Remote
control

Remote
control

Remote
control

Remote
control

Indoor

Unit

Outdoor Unit

Outdoor Unit

Outdoor Unit

Outdoor Unit

Indoor

Unit

Remote
control

Remote
control

Indoor

Unit

Indoor

Unit

Remote
control

Remote
control

Indoor

Unit

Indoor

Unit

Indoor

Unit

Indoor

Unit

2-Core Shield Cable Multi-Core Cable

Electrical Wiring

Areas of Caution

CAUTION

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

WARNING

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

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

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

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

4. 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.

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

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

7. Only the communication line specified should be connected to the terminal block for Outdoor Unit communi­cation .

36 Outdoor Unit

CAUTION

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

Electrical Wiring

Control box and connecting position of wiring

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

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

- Connect communication lines between outdoor unit and indoor units through
the terminal block.

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

- When connecting communication line between outdoor unit and indoor units
with shielded wire, connect the shield ground to the earth screw.

WARNING

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

- Provide an appropriate cover to intercept direct sunlight.

Front Panel

DIRECTION OF PIPING/WIRING

Diode

Inverter PCB

Noise Filter

FAN PCB

Reactor

Main PCB

Terminal Block
(3-Phase 4-wire power system)

ENGLISH

Installation Manual 37

Electrical Wiring

Communication and Power Lines

1) Communication cable

• Types : shielding wire

• Use wires of size : over 1.25mm

2

• Maximum allowable temperature: 60°C

• Maximum allowable line length: under 300m

2) Remote control cable

• Types : 3-core cable

3) Simple central control cable

• Types : 4-core cable (Shielding wire)

• Use wires of size : over 0.75mm

2

4) Separation of communication and power lines

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

Note:

1. The figures are based on assumed length of parallel cabling up to 100m. For length in excess of 100m

the figures will have to be recalculated in direct proportion to the additional length of line involved.

2. If the power supply waveform continues to exhibit some distortion the recommended spacing in the

table should be increased.

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

• Power lines(including power supply to air conditioner) and signal lines must not be laid inside the same

• In the same way, when grouping the lines power and signal lines should not be bunched together.

Current capacity of power line Spacing

10A 300mm

50A 500mm

100A 1000mm

Exceed 100A 1500mm

100V or more

CAUTION

n 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.

38 Outdoor Unit

Electrical Wiring

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

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

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

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

5. Power supply cords of parts of appliances for outdoor use should not be lighter than polychloroprene
sheathed flexible cord.

6. Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from

the power supply.

WARNING

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

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

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

CAUTION

•

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

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

u Wiring of Main Power Supply and Equipment Capacity

CAUTION

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

ENGLISH

Installation Manual 39

Electrical Wiring

When none are available, follow the instructions below.

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

• When connecting wiring which is the same thickness, do as shown in the figure below.

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

• Use an appropriate screwdriver for tightening the 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.

u Precautions when laying power wiring

Round pressure terminal

Power wire

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

40 Outdoor Unit

Electrical Wiring

3 Phase 4 Wires

Power supply

50Hz 380-415V

3 Phase 4 Wires Power line(R, S, T, N)
Communication line (3 line): Wired remote control
Single Phase of power supply line(L, N)
Communication line (2 shield line): Between Indoor Unit and Outdoor Unit

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

Power supply switch
(Switch fuse : ELCB)

34 34 34

(Main Switch)

IDUSODU DRY1 DRY2 GND 12V

INTERNET

BABA

Power supply

1 Phase 50Hz

220-240V

Power supply switch

(Switch)

Pull Box(Installer Option)

u Example Connection of Communication Cable

1. 50Hz

WARNING

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

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

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

ENGLISH

Installation Manual 41

Electrical Wiring

3 Phase 4 Wires

Power supply

60Hz 380V

3 Phase 4 Wires Power line(R, S, T, N)
Communication line (3 line): Wired remote control
Single Phase of power supply line(L, N)
Communication line (2 shield line): Between Indoor Unit and Outdoor Unit

Power supply switch
(Switch fuse : ELCB)

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

34 34 34

IDUSODU DRY1 DRY2 GND 12V

INTERNET

BABA

Power supply

1 Phase 50Hz

220-240V

Power supply switch

(Switch)

Pull Box(Installer Option)

2. 60Hz

WARNING

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

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

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

42 Outdoor Unit

Electrical Wiring

Location of setting Switch

n Location of setting Switch

Main PCB

SW01B

(DIP S/W)

SW02B

(DIP S/W)

7 - Segment

SW02V
Auto addressing

SW01V
Data confirm

n Checking according to dip switch setting

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

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

n Checking the setting of the unit

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

 1 ~255 : model code
 6~10HP : HP numbers
 No display : cooling only 2 : heat pump
 25 : normal
 ARUV series : 70, ARUN series : 170

Example) ARUN60LL2(R2)

85 ‘ 6 ‘ 2 ‘ 25 ‘ 170

 

CAUTION

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

Model code Capacity [kW] Remarks

82 8

Cooling only

83 10
84 5
85 6 Heat pump
86 8

ENGLISH

Installation Manual 43

Electrical Wiring

n Setting the DIP switch (SW01B/SW02B)

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

1. Settings of Master outdoor unit

SW01B Setting RemarksSW02B SettingFunction SW01B Setting Remarks

1234567ON1234567

ON

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

1234567ON1234567

ON

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

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

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

1234567ON1234567

ON

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

Cool/Heat

selector

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

1234567 891011121314

1234567ON1234567

ON

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

1234567ON1234567

ON

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

Standard

Power reset is

Necessary

40 ≤ ESP<60Pa

Power reset is

necessary

Factory Setting

Power reset is

Necessary

- Cooling Target Pressure
: Standard-39

- Heating Target Pressure
: Standard+131

Power reset is

Necessary

60 ≤ ESP<80Pa

Power reset is

Necessary

100 ≤ ESP ≤ 120Pa

Power reset is

Necessary

ARUN

series only

Optional device

Power reset is

Necessary

80 ≤ ESP<100Pa

Long Pipe Length

Outdoor unit

ESP

Compensation

(step 1)

Outdoor unit

ESP

Compensation

(step 2)

Outdoor unit

ESP

Compensation

(step 3)

Outdoor unit

ESP

Compensation

(step 4)

Low blowing

Noise

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

44 Outdoor Unit

Electrical Wiring

SW01B Setting RemarksSW02B SettingFunction SW01B Setting RemarksSW02B SettingFunction

ON

ON

Night Silent

Operation

Pump Down

Forced Oil Return

Vacuum Mode

Pump Out

Snow

Forced

Defrosting

Note: Oil collecting operation is default function which operates after every six hours.

- To enable forced operation of this function change the dip switch setting. And after using,
make sure to restore the dip switch setting.

1234567ON1234567

1234567ON1234567

1234567 891011121314

1234567 891011121314

ON

ON

1234567ON1234567

1234567ON1234567

1234567 891011121314

1234567 891011121314

ON

ON

1234567ON1234567

1234567ON1234567

1234567 891011121314

1234567 891011121314

ON

ON

1234567ON1234567

1234567ON1234567

1234567 891011121314

1234567 891011121314

ON

ON

1234567ON1234567

1234567ON1234567

1234567 891011121314

1234567 891011121314

ON

ON

1234567ON1234567

1234567ON1234567

1234567 891011121314

1234567 891011121314

ON

ON

1234567ON1234567

1234567ON1234567

1234567 891011121314

1234567 891011121314

Power reset is

Necessary
Fan RPM down
at on night time

Power reset is

Necessary

All the refrigerant flows

back into the ODU

Dip switch +

Black button(SW01V)

During Vacuuming,

Valves &

EEV should be opened

ARUN

series only

ARUN

series only

Used when snow piles up

On the ODU Fan.

Fan operates periodically.

ARUN

series only

Accelerates defrost

operation

ENGLISH

Installation Manual 45

Electrical Wiring

Automatic Addressing

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

1) Wait for 3 minutes after applying power supply
(main and sub outdoor unit, indoor unit).

2) Press the switch of the outdoor unit (SW02V) for 5
seconds.

3) A "88" is indicated on 7-segment LED of the out­door unit PCB.

4) For completing addressing, 2~7 minutes are
required depending on numbers of indoor unit con­nection set.

5) Numbers of indoor unit connection set whose
addressing is completed are indicated for 30sec­onds on 7-segment LED of the outdoor unit PCB.

6) After completing addressing, address of each
indoor unit is indicated on the wired remote control

display window. (CH01, CH02, CH03, .............

CH06: Indicated as numbers of indoor unit connec­tion set.)

Main PCB

SW01B

(DIP S/W)

SW02B

(DIP S/W)

7 - Segment

SW02V
Auto addressing

SW01V
Data confirm

CAUTION

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

u The Procedure of Automatic Addressing

• Auto 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 auto addressing is completed normally.

Auto addressing start

Waiting 3 minutes

Power On

Press SW02V for 5 sec.

7-segment LED = 88

Don't Press SW02V

Waiting about 2~7 minutes

7-segment LED

OK

YES

NO Check the connections

of communication line

= No. of IDUs

46 Outdoor Unit

Electrical Wiring

Group Number setting

Group Number setting for Indoor Units

① Confirm the power of whole system(Indoor Unit, Outdoor Unit) is OFF, otherwise turn off.
② The communication lines connected to INTERNET terminal should be connected to central control of Outdoor

unti with care for their polarity( A ’ A, B ’ B )

③ Turn the whole system on.
④ Set the group and Indoor Unit number with a wired remote control.
⑤ To control several sets of Indoor Units into a group, set the group ID from 0 to F for this purpose.

Terminal block on the main PCB

SODU IDU INTERNET DRY1 DRY2

B

A

B(D) A(C)

GND 12V

B

A

BA

Group recognizing the simple central controller

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

Outdoor Units

ENGLISH

Installation Manual 47

Electrical Wiring

n Using Cool/Heat Selector Installation and Connection

• Connect wires as below figure at the hole of backside of Outdoor Unit Dry Contact.

• Insert the wire in the connection hole pushing the "Push" button.

• Maximum communication line length for Cool/Heat Selector : 200m.

• Setting Main PCB Dip S/W of Master Outdoor Unit.

Cool/Heat Selector Installation and Connection

n Without Cool/Heat Selector Installation and Connection

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

Connect signal terminal block as below figure and description.

- How to set mode without Cool/Heat Selector

• Cooling Mode Setting

¿‘GND Connection
¡‘Off (Open)

• Heating Mode Setting

¿‘ GND Connection
¡‘GND Connection

• Fan Mode Setting

¿‘ Off (Open)
¡‘GND Connection

Mode Change

Outdoor Unit

Heating

Back

Fan

Cooling

GND

GND

GND

48 Outdoor Unit

Test Run

Test Run

1

2

3

4

Check to see whether there is any refrigerant leakage, and slack of power or communication cable.

Confirm that 500 V megger shows 2 MΩ or more between power supply terminal block and ground. Do
not operate in the case of 2 MΩ or less.

NOTE: Never carry out megaohm check over terminal control board. Otherwise the control board

would be broken.
Immediately after mounting the unit or after leaving it turned off for an extended length of time,
the resistance of the insulation between the power supply terminal board and the ground may
decrease to approx. 2 MΩ as a result of refrigerant accumulating in the internal compressor.
If the insulation resistance is less than 2 MΩ, turning on the main power supply and energizing
the crankcase heater for more than 6 hours will cause the refrigerant to evaporate, increasing
the insulation resistance.

Check if high/low pressure common pipe, liquid pipe and gas pipe valves are fully opened.

NOTE: Be sure to tighten caps.

Check if there are any problems in automatic addressing or not:
Check and confirm that there are no error messages in the display of indoor units or remote controls
and LED in outdoor units.

Checks Before Test Run

CAUTION

Preheat of compressor

- Start preheat operation for 3 hours after supplying main power.

- In case that the outdoor temperature is low, be sure to supply power 6 hours before operation so
that the heater is heated(insufficient heating may cause damage of the compressor.)

CAUTION

When cutting main power of the Multi V

- Always apply main power of the outdoor unit during use of product
(cooling season/heating season).

- Always apply power 6 hours in advance to heat the crank case heater where performing test run
after installation of product. It may result in burning out of the compressor if not preheating the
crank case with the electrical heater for more than 6 hours.(In case of the outdoor temperatue
below 10°C)

ENGLISH

Installation Manual 49

Test Run

How to Cope with Test Run Abnormality

The phenomena from main component failure

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

Compressor

Outdoor

fan

Outdoor

EEV

Not operating

Stop during running

Abnormal noise
during running

High pressure error
at cooling

Heating failure, fre­quent defrosting

No operating sound
at applying power

Heating failure,
frozen outdoor heat
exchanger part

Low pressure error
or discharge temper­ature error

Motor insulation broken

Strainer clogged

Oil leakage

Motor insulation failure

R-S-T misconnection

Motor failure,
bad ventilation around
outdoor heat exchanger

Bad connector contact

Coil failure

EEV clogged

EEV clogged

Check resistance between terminals and
chassis

Change strainer

Check oil amount after opening oil port

Check resistance between terminals and
chassis

Check compressor R-S-T connection

Check the outdoor fan operation after being
turned the outdoor units off for some time.
Remove obstacles around the outdoor units

Check connector

Check resistance between terminals

Service necessary

Service necessary

Component Phenomenon Cause Check method and Trouble shooting

50 Outdoor Unit

Test Run

n ARUV series

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

Night Silent Operation

Max. RPM setting method

Dip S/W No.12+14 ON

Master ODU
SW01B

Main PCB Power Reset

Note 1)

Setting the Fan Max. RPM

Master ODU
SW01S

SW01V
SW02V

Setting Complete

CAUTION

1. Request installer to set the function during installation.

2. In case the function is not used, set the dip S/W OFF and reset the power.

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

[Note]

1. Select appropriate RPM referencing noise table.

Step

Setting

Red buttonBlack button

1 time1
2 times2
3 times3

1 time
1 time
1 time

Fan Max

RPM
450+ESP
400+ESP

350+ESP

Judgment

(hr)

8

Operation

(hr)

9
98
98

ENGLISH

Installation Manual 51

Test Run

n ARUN series

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

Max. RPM setting method

Judgment

(hr)

8

6.5
5
8

6.5
5
8

6.5
5

Judgment

(hr)

8

6.5
5
8

6.5
5
8

6.5
5

Master ODU
SW01B

Master ODU
SW01S

SW01V
SW02V

Operation

(hr)

9

10.5
12

9

10.5
12

9

10.5
12

Operation

(hr)

9

10.5
12

9

10.5
12

9

10.5
12

Dip S/W No.12+14 ON

Main PCB Power Reset

Note 1)

Setting the Fan Max. RPM

Setting Complete

CAUTION

1. Request installer to set the function during installation.

2. In case the function is not used, set the dip S/W OFF and reset the power.

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

[Note]

1. Select appropriate RPM referencing noise table.

• ARUN50/60LL2(R2)

Step

1
2
3
4
5
6
7
8
9

1time
2times
3times

4time
5times
6times
7times
8times
9times

Setting

Red buttonBlack button

1time
1time
1time
1time
1time
1time
1time
1time
1time

Fan Max

RPM
380+ESP
380+ESP
380+ESP
340+ESP
340+ESP
340+ESP
300+ESP
300+ESP
300+ESP

• ARUN80LL2(R2)

Step

1
2
3
4
5
6
7
8
9

1time
2times
3times

4time
5times
6times
7times
8times
9times

Setting

Red buttonBlack button

1time
1time
1time
1time
1time
1time
1time
1time
1time

Fan Max

RPM
480+ESP
480+ESP
480+ESP
440+ESP
440+ESP
440+ESP
400+ESP
400+ESP
400+ESP

52 Outdoor Unit

Test Run

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

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

discharge of ODU.

n Static pressure compensation dip S/W setting method

n Each step's ESP setting condition

Vacuum Mode

External static pressure compensation mode

Step Range [Pa] Max. RPM

Step0 0 ≤ ESP < 40 -

Step1 40 ≤ ESP < 60 + 30 RPM

Step2 60 ≤ ESP < 80 + 60 RPM

Step3 80 ≤ ESP < 100 + 100 RPM

Step4 100 ≤ ESP ≤ 120 + 150 RPM

Vacuum mode setting method Vacuum mode cancellation method

Main PCB
SW01S

Main PCB
SW02B

Main PCB
SW01V

Master main PCB DIP switch ON ( No.11,14)

Press the black button Main PCB (5 sec.)

Caution

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

ODU power reset

Vacuum mode setting

ODU V/V OPEN

Main EEV, SC EEV OPEN

IDU EEV OPEN

Master main PCB DIP switch OFF( No.11,14)

Power reset

Vacuum mode cancellation

Static pressure compensation mode setting

method

DIP switch setting

Static pressure compensation mode cancellation

method

DIP switch OFF

Power Reset

Static pressure compensation mode is set

Power Reset

Static pressure compensation mode is cancelled

ENGLISH

Installation Manual 53

Test Run

Self-Diagnosis Function

Error Indicator

• This function indicates types of failure in self-diagnosis and occurrence of failure for air condition.

• Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LED of
outdoor unit control board as shown in the table.

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

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

Error Display

1st, 2nd LED of 7-segment indicates error number, 3rd LED indicates unit number.

Ex) 211 : No.21 error of unit

011 ’ 051 : No.105 error of unit

Display Title Cause of Error

01-

02-

03-

04-

05-

06-

07-

09-

10-

11-

211

221

231

241

251

261

Air temperature sensor of indoor unit

Inlet pipe temperature sensor of indoor unit

Communication error : wired
remote controller ÷ indoor unit

Drain pump

Communication error : outdoor
unit ÷ indoor unit

Outlet pipe temperature sensor of
indoor unit

Different operation mode

Indoor EEPROM error.

Poor fan motor operation

Communication error: indoor unit
’ main PCB of outdoor.

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 High Pressure
Switch

Outdoor Unit Input Voltage High/
Low Voltage

Outdoor Unit Inverter Compressor
Start Failure

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

Malfunction of drain pump

Failing to receive outdoor unit signal in indoor unit PCB

Outlet pipe temperature sensor of indoor unit is
open or short

Operation mode between indoor unit and outdoor unit
is different

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

When the addressing signal doesn't respond for 3mins. suddenly,
while the indoor unit gets the calling signal from the outdoor unit,

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.

The First Start Failure by Outdoor Unit Inverter
Compressor Abnormality

Indoor unit related error

Outdoor unit related error

54 Outdoor Unit

Test Run

System is turned off by outdoor unit Inverter
Compressor High Discharge Temperature

System is turned off by Outdoor Uunit Constant Speed
High Discharge Temperature

System is turned off by excessive increase of high
pressure of outdoor unit

System is turned off by excessive decrease of low
pressure of outdoor unit

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
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.

Reverse connection or omitting connection of R, S, T
power of outdoor unit

Access Error of Inverter PCB of Outdoor Unit

Restriction of Outdoor Unit (Inverter PCB)

Restriction of Outdoor Unit

System is turned off by outdoor unit DC Voltage Over
Charging

Outdoor Unit Inverter Compressor Fault OR Drive
Fault

Outdoor Unit Inverter Compressor
High Discharge Temperature

Outdoor Unit Constant Speed
Compressor High Discharge
Temperature

High Pressure of Outdoor Unit

Low Pressure of Outdoor Unit

Outdoor Unit Inverter Compressor
CT Sensor Fault

Outdoor Unit Inverter Compressor
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 Fault

Outdoor Unit Suction Temperature
Sensor Fault

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

Excessive capacity of indoor units

Communication error : inverter
PCB ’ Main PCB

Communication error : indoor unit
’ main PCB of outdoor unit

Reverse connection of R, S, T
power of Outdoor unit

Inverter PCB EEPROM Error of
Outdoor Unit

Communication error : inverter
PCB ’ Main PCB

Outdoor Unit Fan Lock

Outdoor Unit Inverter DC link High
Voltage

Outdoor Unit Inverter Compressor
Over Current

Display Title Cause of Error

321

331

341

351

401

411

421

431

441

451

461

501

511

521

531

541

561

571

671

Outdoor unit related error

281

291

ENGLISH

Installation Manual 55

Test Run

Outdoor Unit R-T Phase Difference is over 5A

Outdoor Unit Fan CT Sensor open or short

Outdoor Unit Fan DC Link High Voltage Error

Outdoor Unit Fan Current is over 5A

Outdoor Unit Fan First Position Sensing Failure

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

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

Failing to receive fan signal at main PCB of unit.

Instant Over Current at Outdoor Unit Fan IPM

Outdoor Unit Fan DC Link Input Voltage is under 380V

Liquid pipe temperature sensor of outdoor unit is open
or short

Outdoor Unit Subcooling Inlet Temperature Sensor
open or short

Outdoor Unit Subcooling Outlet Temperature Sensor
open or short

Pressure unbalance in Outdoor Units

Outdoor Unit Fan Inverter PCB Temperature is Over
95°C

Outdoor Unit Fan PCB Heat Sink Temperature Sensor
open or short

Outdoor Unit 3 Phase Power
unbalance

Outdoor Unit Fan CT Sensor Error

Outdoor Unit Fan DC Link High
Voltage Error

Outdoor Unit Fan Over Current
Error

Outdoor Unit Fan Start Failure
Error

Outdoor Unit Main PCB EEPROM
Error

Outdoor Unit Fan PCB EEPROM
Error

Outdoor Unit Fan PCB
Communication Error

Outdoor Unit FAN IPM Fault Error

Outdoor Unit Fan DC Link Low
Voltage Error

Outdoor Unit Liquid pipe
Temperature Sensor Error

Outdoor Unit Subcooling Inlet
Temperature Sensor Error

Outdoor Unit Subcooling Outlet
Temperature Sensor Error

Failure of operation mode conver­sion at Outdoor Unit

Excessive increase of Outdoor
Unit Fan PCB Heat Sink
Temperature

Outdoor Unit Fan PCB Heat Sink
Temperature Sensor Error

Display Title Cause of Error

871

861

105

106

107

113

114

151

115

193

194

Outdoor unit related error

741

751

761

771

791

56 Outdoor Unit

Caution For Refrigerant Leak

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

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.

n Limiting concentration

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

n Calculate amount of all the replenished refrigerant (kg) per each refrigerant

system.

n Calculate minimum room capacity

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

(1) Without partition

(2) With partition and with opening which serve as

passage of air to adjoining room

Caution For Refrigerant Leak

Introduction

Checking procedure of limiting concentration

Limiting concentration is the limit of Freon gas concentration where immediate measures can be taken with­out hurting human body when refrigerant leaks in the air. The limiting concentration shall be described in the
unit of kg/m

3

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

Limiting concentration: 0.44kg/m

3

(R410A)

Outdoor unit

(No.1 system)

Flow of
refrigerant

Indoor unit

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

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.

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)

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

ENGLISH

Installation Manual 57

Caution For Refrigerant Leak

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

n Calculate refrigerant concentration

n In case the concentration exceeds the limit

When the concentration exceeds the limit, change original plan or take one of the countermeasures
shown below:

• Countermeasure 1

Provide opening for ventilation.
Provide 0.15% or more opening to floor space both above and below door, or provide opening without
door.

• Countermeasure 2

Provide gas leak alarm linked with mechanical ventilator.
Reducing the outdoor refrigerant qty.

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

Outdoor unit

Indoor unit

Smallest
room

(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.

Countermeasure 2

Gas leak alarm

Mechanical ventilator

Countermeasure 1

Opening effective to ventilation

Indoor unit

58 Outdoor Unit

Installation guide at the seaside

Installation guide at the seaside

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

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

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

CAUTION

2.1 Selecting the location(Outdoor Unit)

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

2) Select a well-drained place.

Sea wind Sea wind

h 1. If you canʼt meet above guide line in the seaside installation, please contact LG Electronics for the addi-

tional anticorrosion treatment.

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

using water.

CAUTION:

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