LG ARUN100LH3 INSTALLATION MANUAL
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 : MFL46912320
www.lg.com
MODELS : ARUN Series
2 Outdoor Unit
ARUN Series Outdoor unit Installation Manual
TABLE OF CONTENTS
Safety Precautions ................................................................................................................3
Installation Process ..............................................................................................................7
Outdoor units Information....................................................................................................8
Environment-friendly Alternative Refrigerant R410A ......................................................11
Select the Best Location.....................................................................................................11
Installation Space................................................................................................................12
Lifting method .....................................................................................................................14
Installation ...........................................................................................................................15
Refrigerant piping installation ...........................................................................................20
Pipe connections between indoor and outdoor unit .......................................................24
Electrical Wiring ..................................................................................................................50
Test Run ...............................................................................................................................75
New Function ......................................................................................................................99
Caution For Refrigerant Leak...........................................................................................108
Installation guide at the seaside ......................................................................................110
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
■ 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.
■ 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.
Do not install the product on a defective
installation stand.
• It may cause injury, accident, or damage to the
product.
Installation Manual 3
Safety Precautions
Safety Precautions
4 Outdoor Unit
Ventilate before operating air conditioner
when gas leaked out.
• It may cause explosion, fire, and burn.
Securely install the cover of control box and
the panel.
• If the cover and panel are not installed securely,
dust or water may enter the outdoor unit and fire
or electric shock may result.
If the air conditioner is installed in a small room, measures must be taken to prevent the
refrigerant concentration from exceeding the safety limit when the refrigerant leaks.
• Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceeded. Should the refrigerant leak and cause the safety limit to be exceeded, harzards due to lack of oxygen in the room could result.
n 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 installing and moving the air conditioner to another site, do not charge it with a
different refrigerant from the refrigerant
specified on the unit.
• If a different refrigerant or air is mixed with the
original refrigerant, the refrigerant cycle may
malfunction and the unit may be damaged.
Do not reconstruct to change the settings of
the protection devices.
• If the pressure switch, thermal switch, or other
protection device is shorted and operated
forcibly, or parts other than those specified by
LGE are used, fire or explosion may result.
When the product is soaked (flooded or
submerged), contact an Authorized Service
Center.
• There is risk of fire or electric shock.
Be cautious not to touch the sharp edges
when installing.
• It may cause injury.
Take care to ensure that nobody could step
on or fall onto the outdoor unit.
• This could result in personal injury and product
damage.
Do not open the inlet grille of the product
during operation. (Do not touch the electrostatic filter, if the unit is so equipped.)
• There is risk of physical injury, electric shock, or
product failure.
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.
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
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.
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 may not be applied
to the terminals.
• Inadequate connection and fastening may generate heat and cause a fire.
Be sure the installation area does not deteriorate with age.
• If the base collapses, the air conditioner could
fall with it, causing property damage, product
failure, or personal injury.
Install and insulate the drain hose to ensure that water is drained away properly based on the
installation manual.
• A bad connection may cause water leakage.
Installation Manual 5
Safety Precautions
Safety Precautions
6 Outdoor Unit
Safely dispose of the packing materials.
•
Packing materials, such as nails and other metal or
wooden parts, may cause stabs or other injuries.
•
Tear apart and throw away plastic packaging bags
so that children may not play with them. If children
play with a plastic bag which was not torn apart,
they face the risk of suffocation.
Turn on the power at least 6 hours before
starting operation.
• Starting operation immediately after turning on
the main power switch can result in severe
damage to internal parts. Keep the power switch
turned on during the operational season.
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.
Do not touch any of the refrigerant piping
during and after operation.
• It can cause a burn or frostbite.
Do not operate the air conditioner with the
panels or guards removed.
• Rotating, hot, or high-voltage parts can cause
injuries.
Do not directly turn off the main power
switch after stopping operation.
• Wait at least 5 minutes before turning off the
main power switch. Otherwise it may result in
water leakage or other problems.
Auto-addressing should be done in condition of
connecting the power of all indoor and outdoour
units. Auto-addressing should also be done in
case of changing the indoor unit PCB.
Use a firm stool or ladder when cleaning or
maintaining the air conditioner.
• Be careful and avoid personal injury.
Do not insert hands or other objects through
the air inlet or outlet while the air conditioner
is plugged in.
• There are sharp and moving parts that could
cause personal injury.
Installation Process
• 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.)
Installation Manual 7
Installation Process
Determination of division work
Indicate clearly who will be responsible for switch setting.
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)
Airtight test
Vacuum drying
Additional charge of refrigerant
Fit facing panels
Automatic addressing of indoor unit
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
Refer to automatic addressing flowchart
Preheat the crank case with the electrical heater for more than 6 hours.
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
Test run adjustment
Transfer to customer with explanation
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
Outdoor units Information
8 Outdoor Unit
Outdoor units Information
■ Heat pump
Power Supply: Outdoor Unit (3Ø, 380 - 415V, 50Hz/3Ø, 380V, 60Hz)
Unit
System(HP)
Model
Product refrigerant charge
kg
Max. Connectable No. of Indoor Units
Net Weight kg
lbs
Dimensions (WxHxD) mm
inch
Connecting Pipes Liquid Pipes[mm(inch)]
Gas Pipes[mm(inch)]
1 Outdoor unit
8 10 12
ARUN80LH3 ARUN100LH3 ARUN120LH3
ARUN80LH3 ARUN100LH3 ARUN120LH3
6.4 6.4 7.0
13 16 20
240×1 240×1 270×1
529×1 529×1 595×1
(920×1,680×760)×1 (920×1,680×760)×1 (1,240×1,680×760)×1
(36.2×66.1×29.9)×1 (36.2×66.1×29.9)×1 (48.8×66.1×29.9)×1
9.52(3/8) 9.52(3/8) 12.7(1/2)
19.05(3/4) 22.2(7/8) 28.58(1 1/8)
Unit
System(HP)
Model
Product refrigerant charge
kg
Max. Connectable No. of Indoor Units
Net Weight kg
lbs
Dimensions (WxHxD) mm
inch
Connecting Pipes Liquid Pipes[mm(inch)]
Gas Pipes[mm(inch)]
1 Outdoor unit 2 Outdoor unit
14 16 18
ARUN140LH3 ARUN160LH3 ARUN180LH3
ARUN140LH3 ARUN160LH3 ARUN100LH3
ARUN80LH3
7.5 9.0 12.8
23 26 29
340×1 350×1 240×2
749×1 771×1 529×2
(1,240×1,680×760)×1 (1,240×1,680×760)×1 (920×1,680×760)×2
(48.8×66.1×29.9)×1 (48.8×66.1×29.9)×1 (36.2×66.1×29.9)×2
12.7(1/2) 12.7(1/2) 15.88(5/8)
28.58(1 1/8) 28.58(1 1/8) 28.58(1 1/8)
Unit
System(HP)
Model
Product refrigerant charge
kg
Max. Connectable No. of Indoor Units
Net Weight kg
lbs
Dimensions (WxHxD)
mm
inch
Connecting Pipes Liquid Pipes[mm(inch)]
Gas Pipes[mm(inch)]
2 Outdoor unit
20 22 24
ARUN200LH3 ARUN260LH3 ARUN240LH3
ARUN100LH3 ARUN120LH3 ARUN120LH3
ARUN100LH3 ARUN100LH3 ARUN120LH3
12.8 13.4 13.9
32 35 39
240×2 270×1 + 240×1 340×1 + 240×1
529×2 595×1 + 529×1 749×1 + 529×1
(920×1,680×760)×2
(1,240×1,680×760)×1 (1,240×1,680×760)×1
(920×1,680×760)×1 (920×1,680×760)×1
(36.2×66.1×29.9)×2
(48.8×66.1×29.9)×1 (48.8×66.1×29.9)×1
(362×66.1×29.9)×1 (362×66.1×29.9)×1
15.88(5/8) 15.88(5/8) 15.88(5/8)
28.58(1 1/8) 28.58(1 1/8) 35.9(1 3/8)
Unit
System(HP)
Model
Product refrigerant charge
kg
Max. Connectable No. of Indoor Units
Net Weight kg
lbs
Dimensions (WxHxD)
mm
inch
Connecting Pipes Liquid Pipes[mm(inch)]
Gas Pipes[mm(inch)]
2 Outdoor unit
26 28 30
ARUN260LH3 ARUN280LH3 ARUN300LH3
ARUN160LH3 ARUN160LH3 ARUN160LH3
ARUN100LH3 ARUN120LH3 ARUN140LH3
15.4 16.0 16.5
42 45 49
350×1 + 240×1 350×1 + 270×1 350×1 + 340×1
771×1 + 529×1 771×1 + 595×1 771×1 + 749×1
(1,240×1,680×760)×1
(1,240×1,680×760)×2 (1,240×1,680×760)×2
(920×1,680×760)×1
(48.8×66.1×29.9)×1
(48.8×66.1×29.9)×2 (48.8×66.1×29.9)×2
(362×66.1×29.9)×1
19.05(3/4) 19.05(3/4) 19.05(3/4)
34.9(1 3/8) 34.9(1 3/8) 34.9(1 3/8)
Unit
System(HP)
Model
Product refrigerant charge
kg
Max. Connectable No. of Indoor Units
Net Weight kg
lbs
Dimensions (WxHxD)
mm
inch
Connecting Pipes Liquid Pipes[mm(inch)]
Gas Pipes[mm(inch)]
2 Outdoor unit 3 Outdoor unit
32 34 36
ARUN320LH3 ARUN340LH3 ARUN360LH3
ARUN160LH3 ARUN140LH3 ARUN140LH3
ARUN160LH3 ARUN100LH3 ARUN120LH3
ARUN100LH3 ARUN100LH3
18.0 20.3 20.9
52 55 58
350×2 340×1 + 240×2 340×1 + 270×1 + 240×1
771×2 749×1 + 529×2 749×1 + 595×1 + 529×1
(1,240×1,680×760)×2 (1,240×1,680×760)×1 (1,240×1,680×760)×2
(920×1,680×760)×2 (920×1,680×760)×1
(48.8×66.1×29.9)×2 (48.8×66.1×29.9)×1 (48.8×66.1×29.9)×2
(362×66.1×29.9)×2 (362×66.1×29.9)×1
19.05(3/4) 19.05(3/4) 19.05(3/4)
34.9(1 3/8) 34.9(1 3/8) 41.3(1 5/8)
Installation Manual 9
Outdoor units Information
Outdoor units Information
10 Outdoor Unit
Unit
System(HP)
Model
Product refrigerant charge
kg
Max. Connectable No. of Indoor Units
Net Weight kg
lbs
Dimensions (WxHxD)
mm
inch
Connecting Pipes Liquid Pipes[mm(inch)]
Gas Pipes[mm(inch)]
3 Outdoor unit
38 40 42
ARUN380LH3 ARUN340LH3 ARUN360LH3
ARUN160LH3 ARUN160LH3 ARUN160LH3
ARUN120LH3 ARUN120LH3 ARUN140LH3
ARUN100LH3 ARUN120LH3 ARUN120LH3
22.4 23.0 23.5
61 64 64
350×1 + 270×1 + 240×1 350×1 + 270×2 350×1 + 340×1 + 270×1
771×1 + 595×1 + 529×1 771×1 + 595×2 771×1 + 749×1 + 595×1
(1,240×1,680×760)×2
(1,240×1,680×760)×3 (1,240×1,680×760)×3
(920×1,680×760)×1
(48.8×66.1×29.9)×2
(48.8×66.1×29.9)×3 (48.8×66.1×29.9)×3
(362×66.1×29.9)×1
19.05(3/4) 19.05(3/4) 19.05(3/4)
41.3(1 5/8) 41.3(1 5/8) 41.3(1 5/8)
Unit
System(HP)
Model
Product refrigerant charge
kg
Max. Connectable No. of Indoor Units
Net Weight kg
lbs
Dimensions (WxHxD) mm
inch
Connecting Pipes Liquid Pipes[mm(inch)]
Gas Pipes[mm(inch)]
3 Outdoor unit
44 46 48
ARUN440LH3 ARUN340LH3 ARUN360LH3
ARUN160LH3 ARUN160LH3 ARUN160LH3
ARUN160LH3 ARUN160LH3 ARUN160LH3
ARUN120LH3 ARUN140LH3 ARUN160LH3
25.0 25.5 27.0
64 64 64
350×2 + 270×1 350×1 + 340×2 350×3
771×2 + 595×1 771×1 + 749×2 771×3
(1,240×1,680×760)×3 (1,240×1,680×760)×3 (1,240×1,680×760)×3
(48.8×66.1×29.9)×3 (48.8×66.1×29.9)×3 (48.8×66.1×29.9)×3
19.05(3/4) 19.05(3/4) 19.05(3/4)
41.3(1 5/8) 41.3(1 5/8) 41.3(1 5/8)
Select the Best Location
Select space for installing outdoor unit, which will meet the following conditions:
• No direct thermal radiation from other heat sources
• No possibility of annoying neighbors by noise from unit
• No exposition to strong wind
• With strength which bears weight of unit
• Note that drain flows out of unit when heating
• With space for air passage and service work shown next
• Because of the possibility of fire, do not install unit to the space where generation, inflow, stagnation, and
leakage of combustible gas is expected.
• Avoid unit installation in a place where acidic solution and spray (sulfur) are often used.
• Do not use unit under any special environment where oil, steam and sulfuric gas exist.
• It is recommended to fence round the outdoor unit in order to prevent any person or animal from accessing the
outdoor unit.
• If installation site is area of heavy snowfall, then the following directions should be observed.
- Make the foundation as high as possible.
- Fit a snow protection hood.
• Select installation location considering following conditions to avoid bad condition when additionally performing
defrost operation.
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 (near beach, coast, lake, etc. )
(Ex : Rooftop where there is always sunshine.)
• 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.
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 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.
Installation Manual 11
Environment-friendly Alternative Refrigerant R410A
Installation Space
12 Outdoor Unit
Installation Space
Individual Installation
■ During the installation of the unit, consider service, inlet, and outlet and acquire the minimum space
as shown in the figures below.
) -
*
,
)
+
*
,
-
+
) -
*
.
+
,
) -
*
.
+
,
)
-
*
)
*
-
Category
Case 1
(10mm≤Space A,C≤49mm)
Case 2
(Space A,C≥49mm)
Installation Space
4 sides are
walls
Only 2 sides
are walls
Limitations on
the height of
the wall
(Refer to 4
side walls)
Front
Front
Front
Front
Front
Front
Front
Front
Front
No limit to the height of the wall
No limit to the
height of the wall
Front
• The height of the wall on the front side must be 1500mm or less.
• The height of the wall on the inlet side must be 500mm or less.
• There is no limit to the wall on the side.
• If the height of the walls on the front and the inlet are higher than the limit,
there must be additional space on the front and the side.
- Additional Space on the inlet side by 1/2 of h1.
- Additional Space on the front side by 1/2 of h2
- h1 = B(Actual height) - 1500
- h2 = A(Actual height) - 500
A≥10 A≥50
B≥300 B≥100
C≥10 C≥50
D≥500 D≥500
A≥10 A≥50
B≥300 B≥100
C≥10 C≥50
D≥500 D≥500
E≥20 E≥100
A≥10 A≥50
B≥300 B≥100
C≥10 C≥50
D≥500 D≥500
E≥20 E≥100
F≥600 F≥500
A≥10 A≥50
B≥300 B≥100
C≥10 C≥50
D≥300 D≥100
E≥20 E≥100
F
≥500 F≥500
A≥10
B≥300
A≥200
B≥300
E≥400
P
)
P
*
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.
1. 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)
2. Don't install the suction hole and discharge hole of the Outdoor Unit facing the seasonal wind.
Installation Manual 13
Installation Space
Lifting method
14 Outdoor Unit
• When carrying the suspended, unit pass the ropes under the unit and use the two suspension points each at
the front and rear.
• Always lift the unit with ropes attached at four points so that impact is not applied to the unit.
• Attach the ropes to the unit at an angle of 40° or less.
Lifting method
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.
Weight per Capacity
Chassis
Capacity(HP) Weight(kg)
UX2
8 240
10 240
UX3
12 270
14 340
16 350
Locking points for
transportation ropes
Forklift Carrying Hole
Forklift Carrying Guide
Installation
The location of the Anchor bolts
• Install at places where it can endure the weight and vibration/noise of the outdoor unit.
• The outdoor unit supports at the bottom should have width of at least 100mm under the unitʼs legs before being fixed.
• The outdoor unit supports should have minimum height of 200mm.
• Anchor bolts must be inserted at least 75mm.
Chassis Outdoor Unit Capacity A(mm) B(mm)
UX2 8~10HP 920 792
UX3 12~16HP 1240 1102
Installation Manual 15
Installation
For outdoor units of 23kW or
above should not be supported
only by the corner supports.
Outdoor units of 14.5, 16kW
can be supported only by the
corner supports.
At least 100mm
At least 100mm
At least 100mm
At least 100mm
At least 100mm
Needed for outdoor units of 8HP or above
Center of the Unit
At least 100mm
Needed for outdoor units of 8HP or above
Center of the Unit
Unit : mm
6565
At least 65At least 65
730
760
Installation
16 Outdoor Unit
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).
WARNING
• Install where it can sufficiently support the weight of the outdoor unit.
If the support strength is not enough, the outdoor unit may drop and hurt people.
• Install where the outdoor unit may not fall in strong wind or earthquake.
If there is a fault in the supporting conditions, the outdoor unit may fall and hurt people.
• Please take extra cautions on the supporting strength of the ground, water outlet treatment(treatment of the water flowing out of the outdoor unit in operation), and the passages of the pipe and
wiring, when making the ground support.
• Do not use tube or pipe for water outlet in the Base pan. Use drainage instead for water outlet.
The tube or pipe may freeze and the water may not be drained.
WARNING
• Be sure to remove the Pallet(Wood Support) of the bottom
side of the outdoor unit Base Pan before fixing the bolt. It
may cause the unstable state of the outdoor settlement,
and may cause freezing of the heat exchanger resulting in
abnormal operations.
• Be sure to remove the Pallet(Wood Support) of the bottom
side of the outdoor unit before welding. Not removing
Pallet(Wood Support) causes hazard of fire during welding.
At least 200mm
Unit : mm
200
75
75
200
100
Ⓐ 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 bot-
tom side)
Ⓔ H-beam support
Ⓕ Concrete support
Pallet(Wood Support)
- Remove before Installation
Preparation of Piping
1) Cut the pipes and the cable.
■ Use the accessory piping kit or the pipes purchased
locally.
■ Measure the distance between the indoor and the outdoor unit.
■ Cut the pipes a little longer than measured distance.
■ Cut the cable 1.5m longer than the pipe length.
2) Burrs removal
■ Completely remove all burrs from the cut cross section
of pipe/tube.
■ Put the end of the copper tube/pipe to downward direction as you remove burrs in order to avoid to let burrs
drop in the tubing.
3) Flaring work
■ Carry out flaring work using flaring tool as shown below.
Firmly hold copper tube in a bar(or die) as indicated
dimension in the table above.
4) Check
■ Compare the flared work with figure below.
■ If flare is noted to be defective, cut off the flared section
and do flaring work again.
Main cause of gas leakage is defect in flaring work. Carry out correct flaring work in the following procedure.
Pipe
" A "
Gas Liquid Gas
Liquid
<5.6(19,100) 1/2" 1/4" 0.5~0.8 0~0.5
<16.0(54,600) 5/8" 3/8" 0.8~1.0 0.5~0.8
<22.4(76,400) 3/4" 3/8" 1.0~1.3 0.5~0.8
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 =
Installation Manual 17
Installation
Installation
18 Outdoor Unit
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
pipe size tightening torque(Ncm) A(mm) flare shape
Ø9.5 3270-3990 12.8-13.2
Ø12.7 4950-6030 16.2-16.6
Ø15.9 6180-7540 19.3-19.7
2
90
45
2
A
R=0.4~0.8
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.
HEAT INSULATION
Installation Manual 19
Installation
Indoor unit
Fastening band
(accessory)
Refrigerant piping
Thermal insulator
(accessory)
Refrigerant piping installation
20 Outdoor Unit
Precautions on Pipe connection / Valve operation
Refrigerant piping installation
1. For High Low Pressure Common Pipe, use provided elbows to
connect between the outdoor units using pipes.
2. During the cutting of the pipes, remove burr, foreign substances
before connecting. Otherwise, the unit may not operate because
of the sludge inside the pipe.
3. Apply Nitrogen Gas of pressure until 3.8MPa(38.7kgf/cm
2
) for work
area leakage test.
4. After the degree of a vacuum reaches 5 torr, continue the vacuum-
ing work for more than 1 hour.
5. Open the side pole with hexagonal wrench.
Installing 2 units
Installing 3 units
Gas pipe
Liquid pipe
Common pipe
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.
❈ When connecting to high low pressure com-
mon pipe, connect pipes using connecting
elbows.
Detach Knock outs according to
needs.
Detach
Knock outs
according to
needs.
Installing on the front side Installing on the side(Limited to high
low pressure common pipe)
WARNING
• Always careful not to leak the refrigerant during welding.
• The refrigerant generates poisonous gas harmful to human body if combusted.
• Do not perform welding in a closed space.
• Be sure to close the cap of the service port to prevent gas leakage after the work.
CAUTION
Please block the pipe knock outs of the front and side panels after installing the pipes.
(Animal or foreign objects may bring into damage the cable.)
High Low Pressure Common Pipe Connections
outdoor units
Connection of Outdoor units
For more information, refer accessory installation manual.
Field Supply (Not provided by LG)
Common pipes
[Unit : mm]
Y branch
A
B
To outdoor unit
To branch piping or indoor unit
A
B
Facing
upwards
Facing
downwards
Within ± 3° Within ± 3°
Viewed from point A
in direction of arrow
Within +/- 10
Installation Manual 21
Refrigerant piping installation
Outdoor units Model Gas pipe Liquid pipe
I.D.28.58
2 Unit
3 Unit
C
C
C
C
ARCNN21
ARCNN31
I.D.19.05
O.D.19.05
I.D.19.05
O.D.19.05
416
408
I.D.34.9I.D.31.8
I.D.41.3 I.D.38.1 O.D.34.9
130
341
298
O.D.34.9
I.D.41.3
125
I.D.34.9I.D.41.3
I.D.28.58
I.D.22.2
I.D.28.58
I.D.28.58
331
314
I.D.15.88
I.D.19.05
111
I.D.22.2 O.D.19.05
7
111
I.D.19.05I.D.22.2
I.D.15.88
I.D.12.7
I.D.9.52
83
I.D.15.88I.D.12.7
0
334
281
83
I.D.19.05
I.D.12.7 I.D.15.88
Refrigerant piping installation
22 Outdoor Unit
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 perfor-
mance.
11. Never use refrigerant to perform an air purge. Always evacuate air by using a vacuum pump.
Caution
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
Y branch
ARBLN01621, ARBLN03321
ARBLN07121, ARBLN14521
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 1.55 2.1
41.3
44.45 53.98
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]
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.
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.
Installation Manual 23
Refrigerant piping installation
Pipe connections between indoor and outdoor unit
24 Outdoor Unit
• Pipe connections can be done on the front side or on the side according to the installation environments.
• Be sure to let 0.2kgf/cm
2
Nitrogen flow in the pipe when welding.
• If Nitrogen was not flown during welding, many oxidized membranes may form inside the pipe and disturb the normal
operations of valves and condensers.
• Use Knock Outs of Base Pan of the outdoor unit for Left/Right or Bottom pipe drawing outs.
Refrigerant Pipe
Regulator
Nitrogen
Nitrogen
Direction
Taping
Valve
1. Open the front panel.
2. Remove Brackets
3. Fix with only nut and washer as shown in the
figure.
Brackets for Transportation
Washer
Nut
Pipe connections between indoor and outdoor unit
Preparation Work
CAUTION
•
Do not damage the pipe/ base during the knock out removal works
.
•
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.
CAUTION
• Remove the brackets on the inverter condenser legs that were fixed to protect the unit during the transportation.
(If bracket is not removed, abnormal noise or vibration may occur.)
Left Side Pipe Draw Out
Removal Area for common
pipe bottom side connections.
Front Side Pipe Draw Out
Removal Area for Liquid/Gas pipe
bottom side connections.
Right Side Pipe Draw Out
■ 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:
1. Verify whether the liquid/gas/common pipes are locked.
2. Extract remaining refrigerant or air inside using the ser-
vice port.
3. Remove the leakage prevention cap
■ Method of pipe cap work during the instal-
lation of single outdoor unit
1. Remove rubber cap inserted in the common pipe.
2. Wrap the common pipe service valve with wet towel.
3. Insert the pipe cap provided into the common pipe.
4. Place the flare nut under the pipe cap as shown to prevent
the pipe cap movement.
5. Weld the pipe cap.
❈ If not wrapped with a wet towel, there may be damages
inside the valve.
❈ If the unit is operated without pipe cap work, there may be
abnormality in the cycle caused by refrigerant leakage.
■ Method of drawing out pipes on the front side
• Proceed with the pipe work as shown in the below figure for front side pipe drawing out.
Pipe Cap
Flare Nut
Pipe Drawing Out during Single / Series connection
Common pipe Liquid pipe Gas pipe
Pipe Knock Out for
Liquid/Gas pipes
Pipe Knock Out for
common pipes
Installation Manual 25
Pipe connections between indoor and outdoor unit
Common pipe
Liquid pipe
Gas pipe
Service Port
Leakage Prevention Cap
Pipe connections between indoor and outdoor unit
26 Outdoor Unit
Common pipe Liquid pipe Gas pipe
Remove only liquid/gas pipe Knock Out Remove Base Pan
Common pipe
Remove Base Pan
Liquid pipe Gas pipe
■ Method of drawing out pipes on the bottom side
①
Drawing out common pipe through side panel
■ Figure of sides when drawing out the pipe through bottom side
②
Drawing out common pipe through bottom side
i) Single outdoor unit
ii) Series outdoor units
(Draw out common pipes
through bottom)
iii) Series outdoor units
(Draw out common pipes
through side panel)
Remove Pipe
Knock Out Hole
◆ Y branch method
Refrigerant piping system
1 Outdoor Units
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Piping length from outdoor branch to outdoor unit ≤10m, equivalent length:max 13m
(for 18HP or more)
Additional Application
To satisfy above condition to make 40 m ~ 90 m of pipe length after first branch.
1) Diameter of pipes between first branch and the last branch should be increased by one step,
except pipe diameter B,C,D is same as Diameter A
Ø6.35 → Ø 9.52 → Ø 12.7 → Ø 15.88 → Ø 19.05 → Ø 22.2 → Ø 25.4*, Ø 28.58 → Ø 31.8*, Ø 34.9 → Ø
38.1*
* : It is not necessary to size up.
2) While calculating whole refrigerant pipe length, pipe B,C,D length should be calculated twice.
A+Bx2+Cx2+Dx2+a+b+c+d+e ≤ 1,000 m
3) Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 40 m
4) [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)]
- [Length of pipe outdoor unit to the closest indoor unit 1 (A+a)] ≤ 40 m
2 Outdoor Units
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓔ : Connection branch pipe
between Outdoor units:
ARCNN21
Installation Manual 27
Pipe connections between indoor and outdoor unit
L150m (200 m : Conditional application)
l
40m (90 m : Conditional application)
H 110m
10m or
less
Slave
Slave
Master
H 110m
Slave
Master
L150m (200 m : Conditional application)
l 40m (90 m : Conditional application)
Master
ODU Capacity
Master Slave
Pipe connections between indoor and outdoor unit
28 Outdoor Unit
3 Outdoor Units
Example : 5 Indoor Units
connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓔ : Connection branch pipe
between Outdoor units:
ARCNN31
Ⓕ : Connection branch pipe
between Outdoor units:
ARCNN21
Piping length form outdoor branch to outdoor unit ≤ 10 m, equivalent length : max. 13 m(for 18HP or more)
Additional Application
To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.
1) Diameter of pipes between first branch and the last branch should be increased by one step,
except pipe diameter B,C,D is same as Diameter A
Ø6.35 → Ø 9.52 → Ø 12.7 → Ø 15.88 → Ø 19.05 → Ø 22.2 → Ø 25.4*, Ø 28.58 → Ø 31.8*, Ø 34.9 → Ø
38.1*
* : It is not necessary to size up.
2) While calculating whole refrigerant pipe length, pipe B,C,D length should be calculated twice.
A+Bx2+Cx2+Dx2+a+b+c+d+e ≤ 1,000 m
3) Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 40 m
4) [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)]
- [Length of pipe outdoor unit to the closest indoor unit 1 (A+a)] ≤ 40 m
Slave2
Slave1
Master
10m or
less
H 110m
ODU Capacity
Master ≥ Slave1 ≥ Slave 2
L150m (200 m : Conditional application)
l
40m (90 m : Conditional application)
➲ Refrigerant pipe diameter from branch to branch (B,C,D)
➲ Total pipe length = A+B+C+D+a+b+c+d+e ≤ 1,000 m
• * : Assume equivalent piping length of Y branch to be 0.5m, that of header to be 1m, calculation purpose.
• ** : To apply Conditional Application
Downward Indoor Unit total capacity
[kW(Btu/h)]
≤ 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)
< 33.6(114,700) Ø9.52(3/8) Ø22.2(7/8)
< 50.4(172,000) Ø12.7(1/2) Ø28.58(11/8 )
< 67.2(229,400) Ø15.88(5/8) Ø28.58(11/8 )
< 72.8(248.500) Ø15.88(5/8) Ø34.9(13/8)
< 100.8(344,000) Ø19.05(3/4) Ø34.9(13/8)
< 173.6(592,500) Ø19.05(3/4) Ø41.3(15/8)
< 184.8(630,700) Ø22.2(7/8) Ø44.5(13/4)
< 224.0(764,400) Ø22.2(7/8) Ø53.98(2)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Longest pipe length Equivalent pipe length
A+B+C+D+e ≤ 200m(225m) *A+B+C+D+e ≤ 175m(225 m**)
Longest pipe length after 1st branch
B+C+D+e ≤ 40m(90 m**)
Difference in height(Outdoor Unit ↔ Indoor Unit)
H ≤ 110m
Difference in height (Indoor Unit ↔ Indoor Unit)
h ≤15m
Difference in height (Outdoor Unit ↔ Outdoor Unit)
h1 ≤ 5m
L
l
H
h
h1
Installation Manual 29
Pipe connections between indoor and outdoor unit
WARNING
If overall equivalent pipe length is more than 90m from ODU to the longest IDU,
The diameter of the main pipe (Gas and Liquid pipes) must be increased as follow.
➲ Refrigerant pipe diameter from outdoor unit to first branch. (A)
❈ If available on site, it use this size. Otherwise it can't be increased.
Outdoor unit
Total capacity
[kW (Btu/h)
Standard Pipe Diameter
Conditional application
(more than 90m from ODU to IDU)
Liquid pipe
[mm (inch)]
Gas pipe
[mm (inch)]
Liquid pipe
[mm (inch)]
Gas pipe
[mm (inch)]
16.0~22.4(54,600~76,400)
Φ9.52(3/8)
Φ19.05(3/4)
Φ12.7(1/2)
Φ22.2(7/8)
28.0(95,900)
Φ22.2(7/8) Φ25.4(1)
33.6~44.8(172,000~152,900)
Φ12.7(1/2)
Φ28.58(1 1/8)
Φ15.88(5/8) Φ28.58(1 1/8)
50.4~61.6(172,000~210,600)
Φ15.88(5/8) Φ19.05(3/4)
Φ31.8(1 1/4)
67.2(229,400)
Φ34.9(1 3/8)
Φ34.9(1 3/8)
72.8~95.2(248,500~324,900)
Φ19.05(3/4) Φ22.2(7/8)
Φ38.1(1 1/2)
100.8~168.0(344,000~573,300)
Φ41.3(1 5/8) Φ41.3(1 5/8)
173.6~179.2(592,500~611,600)
Φ22.2(7/8)
Φ44.5(1 3/4)
Φ25.4(1) Φ53.98(2)
184.8~224.0(630,700~764,400)
Φ53.98(2)
Pipe connections between indoor and outdoor unit
30 Outdoor Unit
1 Outdoor Unit
Example : 6 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch
Ⓒ : Indoor Units
Ⓓ : Sealed piping
2 Outdoor Units
Example : 6 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : Header branch
Ⓒ : Indoor Units
Ⓓ : Sealing
Ⓔ : Connection branch pipe
between Outdoor units:
ARCNN21
◆
Header Method
H 110m
L 200m
40m
10m or
less
L 110m
Slave
Master
Slave
Master
L 200m
Slave
Master
ODU Capacity
Master Slave
40m
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