LG MULTI V S ARUN038GSS4 User manual

INSTALLATION MANUAL
Variable Refrigerant Flow Outdoor Units
3.0, 4.0, and 4.4 Tons

For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice.
© LG Electronics U.S.A., Inc.
PROPRIETARY DATA NOTICE
This document, as well as all reports, illustrations, data, information, and other materials are the property of
LG Electronics U.S.A., Inc., and are disclosed by LG Electronics U.S.A., Inc. only in confidence.
For more materials such as submittals, catalogs, engineering,
installation, owner’s, and service manuals, visit www.lghvac.com.
Do not throw away, destroy, or lose this manual.
Please read carefully and store in a safe place for future reference.
Content familiarity required for proper installation.
The instructions included in this manual must be followed to prevent product malfunction, property damage, injury, or death to the user or
other people. Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the
symbols described by the summary list of safety precautions on page 4.

3
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY INSTRUCTIONS
TABLE OF SYMBOLS
This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
This symbol indicates situations that may result in equipment or property damage accidents only.
This symbol indicates an action should not be completed.
WARNING
DANGER
CAUTION
Do not install, remove, or re-install the unit by yourself
(end user). Ask the dealer or a trained technician to install
the unit.
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shock, physical injury or death.
For replacement of an installed unit, always contact an LG
trained service provider.
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death.
Wear protective gloves when handling equipment. Sharp
edges may cause personal injury.
Do not change the settings of the protection devices.
If the protection devices have been bypassed or is forced to operate
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Replace all control box and panel covers.
If cover panels are not installed securely, dust, water and animals may
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death.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
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illness or death.
Periodically check that the outdoor frame is not damaged.
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If the air conditioner is installed in a small space, take
measures to prevent the refrigerant concentration from
exceeding safety limits in the event of a refrigerant leak.
Consult the latest edition ofASHRAE (American Society of Heating,
Refrigerating, andAir Conditioning Engineers) Standard 15. If the
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DOLQMXULHVRUGHDWKIURPR[\JHQGHSOHWLRQ
Dispose the packing materials safely.
•Packing materials, such as nails and other metal or wooden parts,
may cause puncture wounds or other injuries.
•Tear apart and throw away plastic packaging bags so that children
may not play with them and risk suffocation and death.
Install the unit considering the potential for strong winds or
earthquakes.
Improper installation may cause the unit to fall over, resulting in physical
injury or death.
Install the unit in a safe location where nobody can step, fall
onto it, or place objects on it. Do not install the unit on a
defective stand.
It may result in an accident that causes physical injury or death.
Installation
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the unit.
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Do not supply power to the unit until all wiring and pip-
ing are completed or reconnected and checked.
There is risk of physical injury or death due to electric shock.
WARNING
DANGER
The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incor-
rect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols described
below.

4
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY INSTRUCTIONS
CAUTION
Installation, continued
Be very careful when transporting the product. There is a risk
of the product falling and causing physical injury.
•Use appropriate moving equipment to transport each frame; ensure
the equipment is capable of supporting the weights listed.
•Some products use polypropylene bands for packaging. Do not use
polypropylene bands to lift the unit.
• Support the outdoor unit a minimum of four points to avoid
slippage from rigging apparatus.
LG Electronics U.S.A.,Inc., is not responsible for any piping
calculations, refrigerant leaks, degradation of performance,
or any other potential problems or damages as a result of
interconnecting piping, their joint connections, isolation
valves, introduced debris inside the piping system, or other
problems caused by the interconnecting piping system.
Do not install the product where it is exposed directly to
ocean winds.
Sea salt in the air may cause the product to corrode. Corrosion,
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PDOIXQFWLRQRULQHI¿FLHQWRSHUDWLRQ
When installing the outdoor unit in a low-lying area, or a lo-
cation that is not level, use a raised concrete pad or concrete
blocks to provide a solid, level foundation.
This prevents water damage and abnormal vibration.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate that
may drip and cause water damage to walls.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
/RZUHIULJHUDQWOHYHOVPD\FDXVHSURGXFWIDLOXUH
Do not make refrigerant substitutions. Use R410A only.
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unit will malfunction and be damaged.
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unit.
There is a risk of product failure.
Do not use the product for mission critical or special pur-
pose applications such as preserving foods, works of art, or
other precision air conditioning applications. The equipment
is designed to provide comfort cooling and heating.
There is risk of property damage.
Keep the unit upright during installation to avoid vibration or
water leakage.
When connecting refrigerant tubing, remember to allow for
pipe expansion.
Improper piping may cause refrigerant leaks and system malfunction.
Do not install the outdoor unit in a noise-sensitive area.
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim or destroy R410A refrigerant
according to applicable U.S. Environmental Protection
Agency (EPA) rules.
Periodically check that the outdoor frame is not damaged.
There is a risk of equipment damage.
Do not install the unit on a defective stand.
There is a risk of unit and property damage.
Install the drain hose to ensure adequate drainage.
There is a risk of water leakage and property damage.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate
that could drip, causing a slippery surface that creates a risk of slipping,
falling, and personal injury.
WARNING

5
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY INSTRUCTIONS
Do not supply power to the unit until all electrical wiring,
controls wiring, piping, installation, and refrigerant system
evacuation are completed.
System may malfunction.
The information contained in this manual is intended for use
E\DQLQGXVWU\TXDOL¿HGH[SHULHQFHGFHUWL¿HGHOHFWULFLDQ
familiar with the U.S. National Electric Code (NEC) who is
equipped with the proper tools and test instruments.
Failure to carefully read and follow all instructions in this manual can
result in equipment malfunction, property damage, personal injury or
death.
All electric work must be performed by a licensed electrician
and conform to local building codes or, in the absence of
local codes, with the National Electrical Code, and the
instructions given in this manual.
If the power source capacity is inadequate or the electric work is not
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death.
Refer to local, state, and federal codes, and use power wires
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6HFXUHDOO¿HOGZLULQJFRQQHFWLRQVZLWKDSSURSULDWHZLUH
strain relief.
Improperly securing wires will create undue stress on equipment power
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physical injury or death.
Ensure the system is connected to a dedicated power source
that provides adequate power.
If the power source capacity is inadequate or the electric work is not per-
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Properly tighten all power connections.
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injury or death.
Do not change the settings of the protection devices.
If the protection devices have been bypassed or is forced to operate
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ULVNRI¿UHHOHFWULFVKRFNH[SORVLRQDQGSK\VLFDOLQMXU\RUGHDWK
Wiring
DANGER
High voltage electricity is required to operate this system.
Adhere to the NEC code and these instructions when wiring.
Improper connections and inadequate grounding can cause accidental
injury or death.
Always ground the unit following local, state, and NEC codes.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNDQGSK\VLFDOLQMXU\RUGHDWK
Turn the power off at the nearest disconnect before servicing
the equipment.
Electrical shock can cause physical injury or death.
Properly size all circuit breakers or fuses.
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Do not share the electrical circuit with other appliances.
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heat generation.
Do not use damaged or loose power wiring. Do not
modify or extend the outdoor unit’s power wiring randomly.
Ensure that the power wiring will not be pulled nor weight be
placed on the power wiring during operation.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNDQGSK\VLFDOLQMXU\RUGHDWK
WARNING

6
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY INSTRUCTIONS
Do not allow water, dirt, or animals to enter the unit.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Do not operate the unit with the panel(s) or protective
FRYHUVUHPRYHGNHHS¿QJHUVDQGFORWKLQJDZD\IURP
moving parts.
The rotating, hot, cold, and high-voltage parts of the unit can cause
physical injury or death.
Do not touch the refrigerant piping during or after
operation.
It can cause burns or frostbite.
Do not open the inlet during operation.
There is risk of electric shock, physical injury or death.
Operation
DANGER
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or submerged.
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Use a dedicated breaker for this product.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Do not operate the disconnect switch with wet hands.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Periodically verify the equipment mounts have not
deteriorated.
If the base collapses, the unit could fall and cause physical injury or
death.
Use inert (nitrogen) gas when performing leak tests or air
purges. 'RQRWXVHFRPSUHVVHGDLUR[\JHQRUÀDPPD-
ble gases.
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or death.
If refrigerant leaks out, ventilate the area before operating the
unit.
If the unit is mounted in an enclosed, low-lying, or poorly ventilated area,
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VKRFNH[SORVLRQSK\VLFDOLQMXU\RUGHDWK
WARNING
To avoid physical injury, use caution when cleaning or
servicing the air conditioner.
CAUTION
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no metal scraps, screws, or bits of wiring have been left
inside or surrounding the unit.
Do not use the product for mission critical or special pur-
pose applications such as preserving foods, works of art, or
other precision air conditioning applications. The equipment
is designed to provide comfort cooling and heating.
2LOVWHDPVXOIXULFVPRNHHWFFDQVLJQL¿FDQWO\UHGXFHWKHSHUIRUPDQFH
of the unit, or damage its parts.
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure.
Do not open the inlet during operation.
There is risk of unit failure.
Do not operate the unit with the panel(s) or protective
FRYHUVUHPRYHGNHHS¿QJHUVDQGFORWKLQJDZD\IURP
moving parts.
Non-secured covers can result in malfunction due to dust or water in the
service panel.
Periodically verify the equipment mounts have not
deteriorated.
If the base collapses, the unit could fall and cause property damage or
product failure.
Use a only soft cloth to clean the air conditioner. Do not
use wax, thinner, or strong detergents.
Strong cleaning products may damage the surface of the air conditioner,
or may cause its appearance to deteriorate.
Provide power to outdoor unit to warm the compressor
crankcase at least six (6) hours before operation begins.
Starting operation with a cold compressor sump(s) may result in severe
bearing damage to the compressor(s). Keep the power switch on during
the operational season.
Do not block the inlet or outlet.
Unit may malfunction.

7
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
TABLE OF CONTENTS
Safety Instructions .....................................................................................................................................................................................................3-6
0XOWL68QLW6SHFLÀFDWLRQV(OHFWULFDO'DWD................................................................................................................................................................8
R410ARefrigerant..........................................................................................................................................................................................................9
General Installation Guidelines..............................................................................................................................................................................10-26
/RFDWLRQ6HOHFWLRQ ......................................................................................................................................................................................................10
Oceanside Installation Precautions............................................................................................................................................................................10
Rooftop Installations...................................................................................................................................................................................................11
Dealing with Snow and Ice.........................................................................................................................................................................................11
7LH'RZQVDQG/LJKWQLQJ............................................................................................................................................................................................11
ServiceAccess andAllowable Clearances............................................................................................................................................................12-13
Rigging Instructions....................................................................................................................................................................................................14
0RXQWLQJ%ROW/RFDWLRQ...............................................................................................................................................................................................15
Foundation for Installation..........................................................................................................................................................................................15
Piping Preparation...................................................................................................................................................................................................16-46
Piping Materials and Handling...............................................................................................................................................................................16-26
Outdoor Unit Connections.....................................................................................................................................................................................27-28
5HIULJHUDQW3LSLQJ6\VWHP([DPSOHV....................................................................................................................................................................29-33
5HTXLUHG/$76)LOH....................................................................................................................................................................................................34
$FFHSWDEOH3LSLQJ/D\RXWV ........................................................................................................................................................................................35
Branch Pipe Fittings .............................................................................................................................................................................................36-37
Vacuum Mode ............................................................................................................................................................................................................38
Vacuum Procedure.....................................................................................................................................................................................................39
/HDN7HVW ...................................................................................................................................................................................................................40
Refrigerant Charge ...............................................................................................................................................................................................41-42
Refrigerant Piping Insulation.................................................................................................................................................................................43-46
Electrical Wiring......................................................................................................................................................................................................47-63
*HQHUDO:LULQJ*XLGHOLQHV..........................................................................................................................................................................................47
Outdoor Unit Power Wiring and Cable Connections .............................................................................................................................................48-49
3RZHU:LULQJ6SHFL¿FDWLRQV.......................................................................................................................................................................................50
&RPPXQLFDWLRQ&DEOH6SHFL¿FDWLRQV....................................................................................................................................................................51-52
Run Self Diagnostics Check.......................................................................................................................................................................................53
Indoor UnitAutoAddressing..................................................................................................................................................................................54-56
*URXS$GGUHVVLQJ.................................................................................................................................................................................................57-59
Setting the Functions ............................................................................................................................................................................................60-63
',36ZLWFK6HWWLQJVIRU*HQ(TXLSPHQW...................................................................................................................................................................64
7URXEOHVKRRWLQJ6HOI'LDJQRVLV)XQFWLRQV ........................................................................................................................................................65-66
Error Code Tables....................................................................................................................................................................................................67-70
Caution for Refrigerant Leaks ...............................................................................................................................................................................71-72
Installation Checklists.............................................................................................................................................................................................73-84

8
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Model Numbers 3.0 Ton 4.0 Ton 4.4 Ton
ARUN038GSS4 ARUN048GSS4 ARUN053GSS4
Cooling Performance
1RPLQDO&RROLQJ&DSDFLW\%WXK139,500 50,000 55,500
5DWHG&RROLQJ&DSDFLW\%WXK238,000 48,000 53,000
Heating Performance
1RPLQDO+HDWLQJ&DSDFLW\%WXK144,000 56,500 61,500
5DWHG+HDWLQJ&DSDFLW\%WXK242,000 54,000 59,000
Operating Range
&RROLQJ)'% 23 - 122 23 - 122 23 - 122
+HDWLQJ):% -4 - 61 -4 - 61 -4 - 61
Compressor
Inverter Quantity DC Inverter Starting DC Inverter Starting DC Inverter Starting
2LO7\SH PVE / FVC68D PVE / FVC68D PVE / FVC68D
Fan (Side Discharge)
Type Axial Flow Fan Axial Flow Fan Axial Flow Fan
0RWRU2XWSXWN:[4W\ 0.124 x 2 0.124 x 2 0.124 x 2
0RWRU'ULYH Brushless Digitally Controlled / Direct
2SHUDWLQJ5DQJH530 Cooling 0 - 850 0 - 850 0 - 850
Heating 0 - 850 0 - 850 0 - 850
0D[LPXP$LU9ROXPH&)0 3,885 3,885 3,885
Unit Data
Refrigerant Type R410A R410A R410A
5HIULJHUDQW&RQWURO/RFDWLRQ EEV / Indoor Unit EEV / Indoor Unit EEV / Indoor Unit
0D[1XPEHU,QGRRU8QLWV6\VWHP3689
6RXQG3UHVVXUHG%$450 51 52
1HW8QLW:HLJKWOEV 207 207 207
6KLSSLQJ:HLJKWOEV 218 218 218
Communication Cables5,6 2 x 18 2 x 18 2 x 18
Heat Exchanger
0DWHULDODQG)LQ&RDWLQJ Copper Tube /Aluminum Fin and GoldFin™ / Hydrophilic
5RZV)LQVSHULQFK 2 / 14 2 / 14 2 / 14
Piping7
/LTXLG/LQH&RQQHFWLRQLQ2' 3/8 Braze 3/8 Braze 3/8 Braze
9DSRU/LQH&RQQHFWLRQLQ2' 5/8 Braze 5/8 Braze 3/4 Braze
)DFWRU\&KDUJHOEVRI5$ 6.6 6.6 6.6
Table 1: 9+HDW3XPS8QLW6SHFL¿FDWLRQV
1Nominal capacity applied with non-ducted indoor units, and is rated 0 ft. above sea level
with 25 ft. of refrigerant line per indoor unit and a 0 ft. level difference between outdoor and
indoor units.All capacities are net with a Combination Ratio between 95–105%.
Nominal cooling capacity rating obtained with air entering the indoor unit at 80ºF dry bulb
(DB) and 67ºF wet bulb (WB) and outdoor ambient conditions of 95ºF dry bulb (DB) and
75ºF wet bulb (WB).
Nominal heating capacity rating obtained with air entering the indoor unit at 70ºF dry bulb
(DB) and 59ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and
43ºF wet bulb (WB).
25DWHGFDSDFLW\LVFHUWL¿HGXQGHU$+5,6WDQGDUG6HHZZZDKULQHWRUJIRULQIRUPDWLRQ
3The System Combination Ratio must be between 50–130%.
4Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745.
5All communication cable to be minimum 18AWG, 2-conductor, stranded, shielded or
unshielded (if shielded, must be grounded to chassis at ODU only), and must comply with
applicable local and national codes.
63RZHUZLULQJFDEOHLV¿HOGSURYLGHGDQGPXVWFRPSO\ZLWKWKHDSSOLFDEOHORFDODQGQDWLRQ-
al codes. See below for detailed electrical data.
7Refer to the Refrigerant Piping section of this manual for correct line sizing. Contractor
must use LG manufactured Y-Branch and Header Kits only. Designer must verify refriger-
DQWSLSLQJGHVLJQFRQ¿JXUDWLRQXVLQJ/*¶VFRPSXWHUL]HGUHIULJHUDQWSLSLQJ/$760XOWL9
software to validate the pipe design.
Table 2: 208-230V Heat Pump Unit Electrical Data.
Nominal Tons Unit Model No. Compressor Motor &RQGHQVHU)DQ0RWRU MCA MOCP
Quantity MotorAmps )DQ4W\ Amps
5/$(D )/$(D
3.0 ARUN038GSS4 1 19.5 2 1.0 25 40
4.0 ARUN048GSS4 1 23.1 2 1.0 30 50
4.4 ARUN053GSS4 1 25.2 2 1.0 33 50
0XOWL962XWGRRU8QLW6SHFL¿FDWLRQV(OHFWULFDO'DWD
GENERAL DATA

9
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
R410A Refrigerant
R410Arefrigerant has a higher operating pressure in comparison to R22 refrigerant and, therefore, all piping system materials installed must
have a higher resisting pressure than the materials traditionally used in R22 systems.
R410Arefrigerant is an azeotrope of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is 0.
WARNING
'RQRWSODFHUHIULJHUDQWF\OLQGHULQGLUHFWVXQOLJKW5HIULJHUDQWF\OLQGHUPD\H[SORGHFDXVLQJVHYHUHLQMXU\RUGHDWK
•Because R410Ais a combination of R32 and R125, 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 heat piping more than necessary during installation. Piping may become soft and fail when pressurized.
• Do not use any piping that has not been approved for use in high-pressure refrigerant systems. Piping wall thickness must comply with
the applicable local, state, and federal codes for the 551 psi design pressure of R410A. Inadequate piping may fail when pressurized.
GENERAL DATA
R410A Refrigerant

10
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
GENERAL INSTALLATION GUIDELINES
Location for Outdoor Unit
When deciding on a location to place the outdoor unit, be sure to choose an area where run-off from defrost will not accumulate and freeze on
sidewalks or driveways which may create unsafe conditions.
CAUTION
DANGER
7RDYRLGWKHSRVVLELOLW\RI¿UHGRQRWLQVWDOOWKHXQLWLQDQDUHDZKHUHFRPEXVWLEOHJDVPD\JHQHUDWHÀRZVWDJQDWHRUOHDN)DLOXUHWRGRVRZLOO
cause serious bodily injury or death.
Do not install the unit in a location where acidic solution and spray (sulfur) are often used as this may cause serious bodily injury or death.
Do not use the unit in environments where oil, steam, or sulfuric gas are present as this may cause serious bodily injury or death.
WARNING
• Select a location for installing the outdoor unit that will meet the following general conditions:
• A location strong enough to bear the weight of the outdoor unit.
• A location that allows for optimum air flow and is easily accessible for inspection, maintenance, and service.
• Where piping between the outdoor unit and indoor unit(s) is within allowable limits.
• Include space for drainage to ensure condensate flows properly out of the unit when it is in heating mode. Avoid placing the outdoor unit in
a low-lying area where water could accumulate.
• Install a fence to prevent animals and unauthorized personnel from accessing the outdoor unit.
• Where it will not be subjected to direct thermal radiation from other heat sources, nor an area that would not expose the outdoor unit to
heat or steam like discharge from boiler stacks, chimneys, steam relief ports, other air conditioning units, kitchen vents, plumbing vents,
and other sources of extreme temperatures.
• Where high-frequency electrical noise / electromagnetic waves will not affect operation.
• Where operating sound from the unit will not disturb inhabitants of surrounding buildings.
• Where the unit will not be exposed to direct, strong winds.
Selecting the Best Location for the Outdoor Unit
Ocean winds
Ocean winds
Ocean winds
Windbreaker
Oceanside Installation
Precautions
• Avoid installing the outdoor unit where it
would be directly exposed to ocean winds.
• Install the outdoor unit on the side of the
building opposite from direct ocean winds.
• Select a location with good drainage.
• Periodically clean dust or salt particles off of
the heat exchanger with water.
Additional anti-corrosion treatment may need
to be applied to the outdoor unit at oceanside
locations.
If the outdoor unit must be placed in a
location where it would be subjected to
direct ocean winds, install a concrete
windbreaker strong enough to block
any winds. Windbreaker height and
width should be more than 150% of the
outdoor unit, and be installed at least
27-1/2 inches away from the outdoor unit
to allow for airflow.
2FHDQZLQGVPD\FDXVHFRUURVLRQSDUWLFXODUO\RQWKHFRQGHQVHUDQGHYDSRUDWRU¿QVZKLFKLQ
WXUQFRXOGFDXVHSURGXFWPDOIXQFWLRQRULQHI¿FLHQWSHUIRUPDQFH

11
General Installation Guidelines
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Tie-Downs and Lightning Protection
7LH'RZQV
• The strength of the roof must be checked before installing the
outdoor units.
• If the installation site is prone to high winds or earthquakes, when
installing on the wall or roof, securely anchor the mounting base
using a field-provided tie-down configuration approved by a local
professional engineer (see diagram at right for example).
• Use four wires, deattach the top of the frame at the locations
indicated, thread the screws through the wires, then reattach the
screws to the outdoor unit frame.
• The overall tie-down configuration must be approved by a local
professional engineer. Always refer to local code when using a
wind restraint system.
Lightening Protection
• To protect the outdoor unit from lightning, it should be placed within
the specified lightning safety zone.
• Power cable and communication cable should be installed five (5)
feet away from lightning rod.
• A high-resistance ground system should be included to protect
against induced lightning or indirect strike.
Ground
Safe zone
Lightning rod
Protection Angle (25˚~55˚)
1.5m
5 feet
Lightning rod
Figure 1: Lightning Protection Diagram.
Table 3: 6DIHW\=RQH6SHFL¿FDWLRQV
%XLOGLQJ+HLJKWIHHW 66 98 148 197
3URWHFWLRQ$QJOHÜ 55 45 35 25
If the building does not include lightning protection, the outdoor unit
may be damaged from a lightening strike. Inform the customer of this
possibility in advance.
Rooftop Installations
If the outdoor unit is installed on a roof structure, be sure to level the unit. Ensure the roof structure and anchoring method are adequate for
the unit location. Consult local codes regarding rooftop mounting.
Dealing with Snow and Ice
In climates that experience snow buildup, place the unit on a raised platform to ensure proper condenser airflow. The raised support platform
PXVWEHKLJKHQRXJKWRDOORZWKHXQLWWRUHPDLQDERYHSRVVLEOHVQRZGULIWV0RXQWWKHXQLWRQDILHOGSURYLGHGVWDQGWKDWLVKLJKHUWKDQWKH
maximum anticipated snowfall for the location. Design the mounting base to prevent snow accumulation on the platform in front or back of the
unit case. If necessary, provide a field fabricated hood to keep snow and ice and/or drifting snow from accumulating on the coil surfaces. Use
inlet and discharge duct or hoods to prevent snow or rain from accumulating on the fan inlet and outlet guards. Best practice prevents snow
from accumulating on top of the unit. Consider tie-down requirements in case of high winds or where required by local codes. In all cases,
connected duct work and accessories must provide a combined air pressure drop rating that does not exceed 0.16” WG.
•When deciding on a location to place the outdoor unit, be sure to choose an area where run-off from defrost mode will not
accumulate and freeze on sidewalks or driveways.
•Snow throw mode does not prevent ice from forming on the fan blade or discharge grille.
GENERAL INSTALLATION GUIDELINES
Location for Outdoor Unit
Location of the Front
Attachment Holes
Wires
Location of the Rear
Attachment Holes
Figure 2: Lightening Protection Diagram.

12
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Outdoor Unit Service Access and Allowable Clearances
Proper airflow through the outdoor unit coil is critical for proper unit operation. Figures below and on the next page illustrate clearance re-
TXLUHPHQWVIRUYDULRXVLQVWDOODWLRQVFHQDULRVIRUWKH0XOWL96RXWGRRUXQLW8VHWKHKRWLVOHFROGLVOHDSSURDFKZKHQSODFLQJPXOWLSOHXQLWVLQ
close proximity to each other. Outdoor unit fans draw air from the back of the unit and discharges out the front. Place units back to back and
face to face.
Legend
LR = Rear wall height
LF = Front wall height
H = Unit height
•Installation clearances must comply with local building codes.
•All figures not to scale.
•Never place multiple units facing back to front or front to back as shown immediately below here or high
and low system pressure problems may occur.
Min. 4"
Min. 20"
LFH
Min. 40"
LR < H
Max. 20"
LR
H
Min. 10"
Min. 40"
Single Unit—High Front Wall with Building Overhang
and No Side Walls Single Unit—High Rear Wall and Low Front Wall
with No Side Walls
A
ir
o
w
A
ir
o
w
LF
H
Min. 4" Min. 4"
Min. 4"
Min. 4"
Min. 20"
Min. 4"
Min. 8"
Min. 40"
Min. 12"
Min. 6" Min. 6"
Max. 20"
Min. 40"
Min. 40"
Min. 4"
Min. 20"
Max. 20"
Max. 20"
Min 40"
Min. 20"
Single Unit—High Rear Wall with or
without High Side Walls Single Unit—High Rear and Front Walls with
No Side Walls Side by Side—High Rear and Side Walls
Single Unit—High Rear and Side Walls with
Building Overhang Single Unit—High Front and Rear Walls with Building Overhang and No Side Walls Single Unit—High Rear Wall and Low Front Wall with Building Overhang and No Side Walls
A
ir
o
w
A
ir
o
w
A
ir
o
w
A
ir
o
w
A
ir
o
w
A
ir
o
w
LFH
LF
H
Min. 4"
LFH
LF
H
Airflow Airflow
Figure 3: Improper Outdoor Unit Placement. Figure 4: Proper Outdoor Unit Placement and Clearances.
Figure 5: Proper Outdoor Unit Placement and Clearances, continued.
Service Access and Allowable Clearances for Outdoor Unit
GENERAL INSTALLATION GUIDELINES

13
General Installation Guidelines
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Max. 20"
Min. 40"
Min. 40" Min. 4" Min. 8"
Min. 12"
LR < H
Min. 40"
Min. 50"
Max. 20"
Min. 4"
Min. 12"
Side by Side—High Rear and Side
Walls with Building Overhang Side by Side—High Rear and Front Walls with Building Overhang
A
ir
o
w
A
ir
o
w
LR
Min. 40" Min. 8" Min. 79" Min. 4"
LF H
Min. 59" Min. 12"
Min 4"
Min. 40"
Min. 40"
Max. 20"
Min. 12"
Min. 12"
Min. 119"
Min. 24"
Min. 59"
Min. 4"
LR H
Min. 59" Min. 12"
Min 4"
LF H
Min. 59" Min. 12"
Min 4"
Min. 40"
Max. 20"
Single Row Units—High Rear Wall and Low Front Wall with
No Side Walls or Overhang Side by Side —High Front Wall with Building Overhang and No Side or Rear Walls Side by Side—High Rear Wall and Low Front Wall with No Side Walls
Double Row Units—Low Rear and Front Walls with No Side
Walls or Overhang Side by Side—High Front and Rear Walls with No Side Walls Side by Side—High Rear Wall and Low Front Wall with Building Overhang and No Side Walls
A
i
r

o
w
A
i
r

o
w
A
i
r

o
w
A
i
r
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o
w
A
i
r

o
w
A
i
r

o
w
LF
H
H
LR
LF > H
LF H
LF
H
Legend
LR = Rear wall height
LF = Front wall height
H = Unit height
•Installation clearances must comply with local building codes.
•All figures not to scale.
Figure 6: Proper Outdoor Unit Placement and Clearances, continued.
Figure 7: Proper Outdoor Unit Placement and Clearances, continued.
Service Access and Allowable Clearances for Outdoor Unit
GENERAL INSTALLATION GUIDELINES

14
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Rigging Multi V S Outdoor Units
• When lifting the unit, use lifting straps and place around the unit as shown.
• Always lift the unit using properly sized lifting straps rated to carry the unit weight.
• Ensure the straps are long enough to maintain a maximum of a 40° angle as shown.
&DSDFLW\WRQ 6KLSSLQJ:HLJKWOEV 1HW:HLJKWOEV
3218 2074
4.4
Table 4: 0XOWL9,96KLSSLQJDQG1HW:HLJKWV
WARNING
•Use appropriate moving equipment to transport each frame; ensure the equip-
ment is capable of supporting the weights listed above. If unit is not moved
correctly, it may result in an accident that causes physical injury or death.
•Wear protective gloves when handling equipment. Sharp edges may cause
personal injury.
•Some products include polypropylene bands around the unit for packaging.
Do not use polypropylene bands to lift the unit. Bands may break, resulting
in an accident that causes physical injury or death.
•Tear apart and throw away plastic packaging bags so that children may not play with them and risk suffocation and death.
•/LIWWKHRXWGRRUXQLWIURPWKHEDVHDWVSHFLILHGORFDWLRQV6XSSRUWWKHRXWGRRUXQLWDWDPLQLPXPRIVL[SRLQWVWRDYRLGVOLSSDJH
from the rigging apparatus. If unit is not supported correctly, itmayresult in an accident that causes physical injury or death.
• Do not drop the unit when carrying it with a forklift. Itmayresultinanaccident that causes physical injury or death.
•Use a minimum of three (3) lifting straps of at least 26-1/4 feet long. If unit is not supported correctly, it may result in an accident
that causes physical injury or death.
•Always know where the unit’s center of gravity is before lifting. Hoist the unit with the center of gravity centered among the lifting
straps. If unit is not hoisted properly, itmayresultinanaccident that causes physical injury or death.
Figure 8: Transporting the Outdoor Unit.
When moving / adjusting the placement of the outdoor unit, always hold the unit by the
corners. Moving the outdoor unit using the side intake holes on the frame may damage
the frame.
Air Outlet Grille Air Intake Grille
Corner
Handle
40°
40°
Figure 9: Transporting the Outdoor Unit.
GENERAL INSTALLATION GUIDELINES
Rigging Instructions for Outdoor Unit
Remove the Wood Pallet
Before Installation
8VHRIWKHZRRGSDOOHWDVDVXSSRUWIRUWKHRXWGRRUXQLWPD\FDXVHWKHKHDWH[FKDQJHU
to freeze, resulting in operation malfunction.
WARNING
•Remove the wood pallet at the bottom of the outdoor unit base pan before at-
taching any bolts The wood pallet is not a permanent, stable support, and it may
cause the outdoor unit to fall, resulting in physical injury.
•Remove the wood pallet before brazing. The pallet may catch fire, resulting in
physical injury.
Figure 10: Remove the Wood Pallet.
Place a protective cloth or other soft material at the locations where the casing comes in contact with the lifting straps to prevent damage to
painted surfaces.

15
General Installation Guidelines
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
General Mounting
Securely attach the outdoor unit to a condenser pad,
base rails, or other mounting platform that is secure-
ly anchored to the ground or building structure. See
the figures below, and follow the applicable local
codes for clearance, mounting, anchor, and vibration
attenuation requirements.
• Location must be strong enough to bear the weight
and vibration of the outdoor unit.
• The outdoor unit supports must have a minimum
height of 7-7/8 inches, and a minimum width of
IRXULQFKHVXQGHUWKHXQLW¶VOHJVEHIRUHEHLQJDWWDFKHG
• Anchor bolts must be installed at least three (3) inches into the support.
Figure 12: 0RXQWLQJ%ROW)RXQGDWLRQ'LDJUDP
Nut
3"
Spring Washer
Frame
Anti-Vibration
Materials Minimum
Three (3)
Thread Ridges I-Beam
Concrete
Base Anti-Vibration
Materials
3"
Anchor Bolt
Anchor Bolt
Concrete
Base
7-7/8"
3-15/16"
7-7/8"
GENERAL INSTALLATION GUIDELINES
• I-Beams can be used as a base support.
• Operation sound and vibration from the outdoor units
may transfer to surrounding floors or walls; to reduce
vibration and operation sound, add anti-vibration
materials to the concrete base.
• Ensure there is enough room under the outdoor unit
if installing the piping and wiring using the bottom
access holes.
•The corners of the outdoor unit must be attached firmly to the
support, otherwise, the bolts may bend, cause the outdoor unit
to fall, which may result in physical injury or death.
•Attach the bolts tightly as shown to ensure the outdoor unit
will not fall due to earthquakes or strong wind gusts, causing
physical injury or death.
36-1/4
24-5/16
5-15/16
13 14-1/4
5-15/16
Figure 11: 0XOWL62XWGRRU8QLW0RXQWLQJ2SWLRQV
At least 4 Inches
Center of the Unit
Outdoor Units Should
Not be Supported Only
By the Corners
Center of the Unit
r Unit
pported Only
At least 4 Inches
At least 4 Inches
At least 4 Inches
At least 4 Inches
At least 4 Inches
0RXQWLQJ%ROW/RFDWLRQ)RXQGDWLRQIRU,QVWDOODWLRQ
Figure 13: /RFDWLRQVIRUWKH0RXQWLQJ%ROWV
WARNING
At least 7-7/8 Inches
Concrete Support
I-Beam Support Space for Bottom Install
Wiring and Piping
Anti-Vibration
Materials Between
the Outdoor Unit and
Support
Figure 14: 0RXQWLQJ0HWKRG1R Figure 15: 0RXQWLQJ0HWKRG1R
Mounting the Outdoor Unit

16
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Piping Preparation
GENERAL INSTALLATION GUIDELINES
WARNING
&UHDWLQJD)ODUH)LWWLQJ
One of the main causes of refrigerant leaks is defective flared con-
nections. Create flared connections using the procedure below.
1. Cut the pipe to length.
• 0HDVXUHWKHGLVWDQFHEHWZHHQWKHLQGRRUXQLWDQGWKHRXWGRRUXQLW
• Cut the pipes a little longer than measured distance.
2A. Remove the burrs
• Completely remove all burrs from pipe ends.
• When removing burrs, point the end of the copper pipe down to
avoid introducing foreign materials in the pipe.
2B. Remove the flare nuts attached to the indoor and outdoor units.
Slide the flare nut onto the copper tube.
Table 5: Flared Connection Dimensions.
Copper
tube
90° Slanted Uneven Rough
Pipe
Reamer
Point
down
Flare nut
Copper
tube
Bar
Copper pipe
Clamp handle Red arrow
Cone
Yoke
Handle
Bar
"A"
Slanted
Inside is shiny with no scratches
Smooth
Even length
Damanged
surface
Cracked Uneven
thickness
Incorrect Flares
1.
2A.2B.
3.
4.
3. Flaring the pipe end.
• Use the proper size flaring tool to finish flared connections as
shown.
• ALWAYS create a 45° flare when working with R410A.
• Firmly hold copper tube in a bar with a dimension as indicated in
the table below.
4. Carefully inspect the flared pipe end.
• Compare the geometry with the figures and dimensions as detailed.
• If the flare is defective, cut it off and re-do procedure.
• If flare looks good, blow clean the pipe with dry nitrogen.
90° 2
45°
2
A
R=0.4~0.8
Figure 16: Dimensions of the Flare.
Outdoor Unit Pipe Connections
1. Do not use kinked pipe caused by excessive bending in one specific area on its length.
2. Braze the pipes to the service valve pipe stub of the outdoor unit.
3. After brazing, check for refrigerant gas leaks.
4. When selecting flare fittings, always use a 45° fitting rated for use with high pressure refrigerant R410A. Selected fittings must also
comply with local, state, or federal standards.
• 'RQRWDOORZWKHUHIULJHUDQWWROHDNGXULQJEUD]LQJLIWKHUHIULJHUDQWFRPEXVWVLWJHQHUDWHVDWR[LFJDV7KHUHLVULVNRI¿UHH[SOR-
sion, and physical injury or death.
• 'RQRWEUD]HLQDQHQFORVHGORFDWLRQDQGDOZD\VWHVWIRUJDVOHDNVEHIRUHDIWHUEUD]LQJ7KHUHLVULVNRI¿UHH[SORVLRQDQGSK\VL-
cal injury or death.
Indoor
Unit
%WXK
Pipe “A”
9DSRU
(in.
2'
Liquid
LQ2' 9DSRULQ /LTXLGLQ
 1/2 1/4 5/8 ~ 11/16 7/16 ~ 1/2
<54,600 5/8 3/8 5/8 ~ 11/16 5/8 ~ 11/16
 3/4 3/8 3/4 ~ 13/16 5/8 ~ 11/16

17
General Installation Guidelines
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
3LSHVL]H,QFKHV2' Tightening torque
IWOEV
1/4Ø 13.02 ~ 18.08
3/8Ø 24.59 ~ 30.38
1/2Ø 39.78 ~ 47.74
5/8Ø 45.57 ~ 59.31
3/4Ø 71.61 ~ 87.52
Table 6: Tightening Torque for Flare Nuts.
Do not use polyolyester (POE) or any other type of mineral oil as a thread lubri-
cant. These lubricants are not compatible with PVE oil used in this system and create
oil sludge leading to equipment damage and system malfunction.
7LJKWHQLQJWKH)ODUH&RQQHFWLRQV
When connecting the flare nuts, coat the flare (outside only) with polyvinyl ether (PVE)
refrigeration oil only.
GENERAL INSTALLATION GUIDELINES
Piping Preparation
Loosening the Flare Nuts
Always use two (2) wrenches to loosen the flare nuts. Figure 17: Refrigerant Pipe Brazing.
Pressure-reducing
Valve
Packless
Valve
Tape
Nitrogen
Pipe to
be brazed
Refrigerant
Piping
Brazing Practices
$OOMRLQWVDUHEUD]HGLQWKHILHOG0XOWL96UHIULJHUDWLRQV\VWHPFRPSRQHQWVFRQWDLQYHU\VPDOOFDSLOODU\WXEHVVPDOORULILFHVHOHFWURQLF
expansion valves, oil separators, and heat exchangers that can easily become blocked. Proper system operation depends on the installer
using best practices and utmost care while assembling the piping system.
• While brazing, use a dry nitrogen purge operating at a minimum pressure of three (3) psig and maintain a steady flow.
• Blow clean all pipe sections with dry nitrogen prior to assembly.
• Use a tubing cutter. De-burr and clean all cuts before assembly.
• Store pipe stock in a dry place. Keep pipe capped and clean.
• Use adapters to assemble different sizes of pipe. Use a 15% silver phosphorous copper brazing alloy to avoid overheating and produce
good flow.
• Protect isolation valves, electronic expansion valves, and other heat-sensitive control components from excessive heat with a wet rag or a
heat barrier spray product.
• Do not use flux, soft solder, or anti-oxidant agents.
• Do not use a saw to cut pipe.
Keep the piping system free of contaminants and debris such as copper burrs, slag, or car-
bon dust during installation. Contaminants can result in mechanical failure of the system.
Front Right
Rear
Bottom
Multi V S Outdoor Unit Piping
Installation Options
)RU0XOWL96RXWGRRUXQLWVSLSLQJFDQEHLQVWDOOHGLQRQHRIIRXUGL-
rections: front, rear, right, and bottom. Whatever direction is chosen,
plug the access holes with field-provided putty or insulation to fill all
gaps.
Insects or small animals entering the outdoor unit may cause a short
FLUFXLWLQWKHHOHFWULFDOER[ZKLFKPD\OHDGWR¿UHHOHFWULFVKRFN
physical injury, or death.
Insects or small animals entering the outdoor unit may cause a short
FLUFXLWLQWKHHOHFWULFDOER[ZKLFKPD\OHDGWRXQLWIDLOXUH
WARNING Front Access Hole for
Liquid / Vapor Pipes
Rear Access Hole for Liquid / Vapor Pipes
Figure 18: 0XOWL962XWGRRU8QLW
Piping Installation Options. Figure 19: FrontAccess Hole for 0XOWL963LSLQJ
Figure 20: RearAccess Hole for
0XOWL963LSLQJ

18
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Piping Materials and Handling
Pipes used for the refrigerant piping system must include the specified thickness, and the
interior must be clean.
While handling and storing, do not bend or damage the pipes, and take care not to contami-
nate the interior with dust, moisture, etc. See Table 9 for care of piping.
'U\ Clean Airtight
Principles No moisture should be inside the piping. No dust should be inside the piping. No leaks should occur.
Problems
Caused - Significant hydrolysis of refrigerant oil.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs, capillary tubes are clogged.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
- EEVs and capillary tubes become
clogged.
- Refrigerant gas leaks / shortages.
- Refrigerant oil degradation.
- Poor insulation of the compressor.
- System does not operate properly.
Solutions - Remove moisture from the piping.
- Piping ends should remain capped until
connections are complete.
- Do not install piping on a rainy day.
&RQQHFWSLSLQJSURSHUO\DWWKHXQLW¶VVLGH
- Remove caps only after the piping is
cut, the burrs are removed, and after
passing the piping through the walls.
- Evacuate system to a minimum of 500
microns and ensure the vacuum holds at
that level for 24 hours
- Remove dust from the piping.
- Piping ends should remain capped until
connections are complete.
- Connect piping properly at the side of
the unit.
- Remove caps only after the piping is cut
and burrs are removed.
- Retain the cap on the piping when
passing it through walls, etc.
- Test system for air tightness.
- Perform brazing procedures that comply
with all applicable standards.
- Perform flaring procedures that comply
with all applicable standards.
- Perform flanging procedures that
comply with all applicable standards.
- Ensure that refrigerant lines are pressure
tested to 550 psig.
Moisture Dust Leaks
Table 9: Three Principles of Refrigerant Piping.
Figure 21: Keep Piping Capped While Storing.
2'LQ 1/4 3/8 1/2 5/8 3/4 7/8 1-1/8 1-3/8 1-5/8
Material Rigid or SoftACR
Rated for R410A Rigid or SolidACR Rated for R410A
Min. Bend
5DGLXVLQ .563 .9375 1.5 2.25 3.0 3.0 3.5 4.0 4.5
Min. Wall
7KLFNQHVVLQ .031 .031 .031 .039 .042 .045 .050 .050 .05
Table 7: $&55DWHG&RSSHU7XELQJ0DWHULDO
Type Seamless Phosphorous
Deoxidized
Class UNS C12200 DHP
Straight
Lengths H58 Temper
Coils O60 Temper
Table 8: ACR Rated Piping TubeThicknesses.
Selecting Field-Supplied Copper Tubing
7\SH$&5FRSSHULVWKHRQO\DSSURYHGUHIULJHUDQWSLSHPDWHULDOIRUXVHZLWK/*0XOWL96DLUFRQGLWLRQLQJSURGXFWV$&5UDWHGWXELQJLVWKH
RQO\W\SHWKDWVKLSVZLWK\HOORZFDSV$SSURYHGWXELQJIRUXVHZLWK0XOWL9SURGXFWVZLOOEHPDUNHG³55$7('´DORQJWKHOHQJWKRIWKH
tube.
• 'UDZQWHPSHUULJLG$&5FRSSHUWXELQJLVDYDLODEOHLQVL]HVWKURXJKLQFKHV$670%FOHDQGU\DQGFDSSHG
• $QQHDOHGWHPSHUVRIW$&5FRSSHUWXELQJLVDYDLODEOHLQVL]HVWKURXJKLQFKHV$670%FOHDQGU\DQGFDSSHG
Tube wall thickness should meet local code requirements and be approved for an operating pressure of 551 psi. If local code does not
VSHFLI\ZDOOWKLFNQHVV/*VXJJHVWVXVLQJWXEHWKLFNQHVVSHUWDEOHEHORZ:KHQEHQGLQJWXELQJWU\WRNHHSWKHQXPEHURIEHQGVWRDPLQLPXPDQG
use the largest radii possible to reduce the equivalent length of installed pipe; also, bending radii greater than ten (10) pipe diameters can minimize
pressure drop. Be sure no traps or sags are present when rolling out soft copper tubing coils.
Piping Preparation
GENERAL INSTALLATION GUIDELINES

19
General Installation Guidelines
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Table 10: ACR Copper Tubing Dimensions and Physical Characteristics1-4.
Nominal Pipe
Outside
'LDPHWHULQ
Actual Outside
'LDPHWHULQ
'UDZQ7HPSHU Annealed Temper
Nominal Wall
7KLFNQHVVLQ :HLJKWOEIW Cubic ft per Linear ft Nominal Wall 7KLFNQHVVLQ :HLJKWOEIW Cubic ft per Linear ft
1/4 0.250 -- -- -- 0.030 0.081 .00020
3/8 0.375 0.030 0.126 .00054 0.032 0.134 .00053
1/2 0.500 0.035 0.198 .00101 0.032 0.182 .00103
5/8 0.625 0.040 0.285 .00162 0.035 0.251 .00168
3/4 0.750 0.042 0.362 .00242 0.042 0.362 .00242
7/8 0.875 0.045 0.455 .00336 0.045 0.455 .00336
1-1/8 1.125 0.050 0.655 .00573 0.050 0.655 .00573
1All dimensions provided are in accordance withASTM B280 – Standard.
2Design pressure = 551 psig.
3ACR Tubing is available as hard drawn or annealed (soft) and are suitable for use with R410Arefrigerant.
4The Copper Tube Handbook, 2010, Copper DevelopmentAssociation Inc., 260 MadisonAvenue, New York, NY 10016.
•Commercially available piping often contains dust and other materials.Always blow it clean with a dry inert gas.
•Prevent dust, water or other contaminants from entering the piping during installation. Contaminants can cause mechanical failure.
LG Engineered Y-branch Kits and Header Kits
LG Y-branch and Header kits are highly engineered devices designed to evenly divide the flow of refrigerant, and are used to join one pipe
segment to two or more segments.
No Substitutions
2QO\/*VXSSOLHG<EUDQFKDQG+HDGHU¿WWLQJVFDQEHXVHGWRMRLQRQHSLSHVHJPHQWWRWZRRUPRUHVHJPHQWV7KLUGSDUW\RU¿HOGIDEULFDWHG
7HH¶V<¿WWLQJV+HDGHUVRURWKHUEUDQFK¿WWLQJVDUHQRWTXDOL¿HGIRUXVHZLWK/*0XOWL96V\VWHPV7KHRQO\¿HOGSURYLGHG¿WWLQJVDOORZHGLQ
a Multi V S piping system are 45° and 90° elbows.
Table 11: Y-Branches and Headers.
Y-branch Kit Model No Headers
4 branch 7 branch
ARBLN01621 ARBL054 ARBL057
ARBLN03321 ARBL104 ARBL107
•If the diameter of the branch pipe segments differ from that of the designated refrigerant piping, trim to the desired section using a pipe
cutter, and then use an adapter to connect.
•$OZD\VIROORZPDQXIDFWXUHU¶VJXLGHOLQHVRQUHIULJHUDQWSLSLQJUHVWULFWLRQVVXFKDVPD[LPXPOHQJWKHOHYDWLRQGLIIHUHQFHDQGGLDPHWHUV
Failure to do so can result in reduced heating / cooling performance or equipment malfunction.
Y-Branch Kits
LG Y-branch and kits are highly engineered devices designed to evenly divide the flow of refrigerant, and are used to join one pipe seg-
PHQWWRWZRRUPRUHVHJPHQWV7KHUHLVRQO\RQHW\SHRI<EUDQFKXVHGLQ/*0XOWL6V\VWHPV<EUDQFKHVXVHGZLWKWKHLQGRRUXQLWVLQWKH
refrigerant piping system at each transition. Field-supplied “T” fittings or “Y” branches will not be accepted. Do not install Y-branches
EDFNZDUGVUHIULJHUDQWIORZFDQQRWPDNH8WXUQVWKURXJK<EUDQFKHV7KHHTXLYDOHQWSLSHOHQJWKRIHDFK<EUDQFKƍPXVWEHDGGHGWR
each pipe segment entered into LATS piping design software.
LG Y-Branch Kits Consist of:
• Y-branches: For heat pump systems - one liquid line and one vapor line (two [2] total).
• Reducer fittings as applicable.
• 0ROGHGFODPVKHOOW\SHSHHODQGVWLFNLQVXODWLRQFRYHUV
Install Correctly
•Y-branches can be installed upstream between the Header and the outdoor unit, but a Y-branch cannot be installed between a header
and an indoor unit.
•To avoid the potential of uneven refrigerant distribution through a header fitting, minimize the difference in equivalent pipe length be-
tween the header fitting and each connected indoor unit.
Piping Preparation
GENERAL INSTALLATION GUIDELINES

20
MULTI V S System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Indoor Unit Y-Branches, continued.
,QGRRUXQLW<EUDQFKHVPD\EHLQVWDOOHGLQKRUL]RQWDORUYHUWLFDOFRQ¿JXUDWLRQV:KHQLQVWDOOHG
vertically, position the Y-branch so the straight-through leg is within ±3° of plumb. When
installed horizontally, position the Y-branch so the take-off leg is level and shares the same
horizontal plane as the straight-through leg within ±5° rotation.
Indoor unit Y-branches must always be installed with the single port end towards the outdoor
XQLWWKHWZRSRUWHQGWRZDUGVWKHLQGRRUXQLWV7KH¿UVWLQGRRUXQLW<EUDQFKNLWPXVWEH
located at least three (3) feet from the outdoor unit. Provide a minimum of twenty (20) inches
EHWZHHQD<EUDQFKDQGDQ\RWKHU¿WWLQJVRULQGRRUXQLWSLSHGLQVHULHV
There is no limitation on the number of indoor unit Y-branches that can be installed, but there is
a limitation on the number of indoor units connected to a single outdoor unit. It is recommend-
ed that when a Y-branch is located in a pipe chase or other concealed space, access doors
should be provided for inspection access.
Figure 22: Y-branch Vertical Installation
$OLJQPHQW6SHFL¿FDWLRQ
Figure 23: +RUL]RQWDO&RQ¿JXUDWLRQ
9HUWLFDO83&RQ¿JXUDWLRQ
For Indoor Unit Y-Branches. 9HUWLFDO'2:1&RQ¿JXUDWLRQ For Indoor Unit Y-Branches.
Figure 24: Y-branch Insulation and Pipe Detail.
Header Kits
LG Header kits are highly engineered devices designed to evenly divide the flow of refrig-
erant, and are used to join one pipe segment to two or more segments. Header kits are
intended for use where multiple indoor units are in the same vicinity and it would be better
to “home-run” the run-out pipes back to a centralized location. If connecting multiple
indoor units that are far apart, Y-branches may be more economical.
LG Header Kits Consist of:
• Two headers (one liquid line, one vapor line).
• Reducer fittings as applicable.
• 0ROGHGFODPVKHOOW\SHSHHODQGVWLFNLQVXODWLRQFRYHUV²RQHIRUWKHOLTXLGOLQHDQGRQH
for the vapor line.
Y-branches can be installed upstream between the Header and the outdoor unit, but a
Y-branch cannot be installed between a Header and an indoor unit. Headers must be in-
stalled in a horizontal and level position with the distribution ports of the fitting in the same
horizontal plane as the straight-through branch.
When connecting indoor units to a Header, always connect the unit with the largest nomi-
nal capacity to the port closest to the outdoor unit. Then install the next largest indoor unit
to the next port, working down to the smallest indoor unit. Do not skip ports.
All indoor units connected to a single Header fitting should be located with an elevation
difference between indoor units that does not exceed 49 feet.
LG supplied insulation jacketLG supplied header
Field supplied copper pipe
Field supplied insulation
Field supplied copper pipe
Figure 25: +HDGHU.LW²+RUL]RQWDO5RWDWLRQ/LPLW
0XVWEH,QVWDOOHG/HYHOZLWK1R5RWDWLRQ
Figure 26: Header Insulation and Pipe Detail.
Smaller IDUs
Connect IDUs
Largest IDU
Header Inlet
Header End View
+0.0
-0.0
Piping Preparation
GENERAL INSTALLATION GUIDELINES
±5°
Horizontal Plane
±5°
Branch Leg
Straight-through Leg
Y-branch Inlet