LG Tri-Zone Multi F User manual

MULTI FMAX
MULTI F
OUTDOOR UNIT
INSTALLATION MANUAL
Multi-Zone Heat Pump Systems
1.5 to 5 Tons
Dual and Tri-Zone
Multi F Quad-Zone Multi F Eight-Zone Multi F MAX

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
Safety Instructions
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.
MULTI FMAX
MULTI F
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.
DANGER
CAUTION
Do not install, remove, or re-install the unit by yourself
(end user). Ask the dealer or an 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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ULVNRI¿UHHOHFWULFVKRFNH[SORVLRQDQGSK\VLFDOLQMXU\RUGHDWK
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.
7KHUHLVDULVNRIH[SORVLRQSK\VLFDOLQMXU\RUGHDWK
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
UHIULJHUDQWOHDNVDQGVDIHW\OLPLWVDUHH[FHHGHGLWFRXOGUHVXOWLQSHUVRQ-
DOLQMXULHVRUGHDWKIURPR[\JHQGHSOHWLRQ
The branch distribution (BD) unit must be installed indoors;
do not install the BD unit in a highly humid environment.
There is risk of physical injury or death due to electric shock.
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
'RQRWVWRUHRUXVHÀDPPDEOHJDVRUFRPEXVWLEOHVQHDU
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.
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 F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
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.
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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,
SDUWLFXODUO\RQWKHFRQGHQVHUDQGHYDSRUDWRU¿QVFRXOGFDXVHSURGXFW
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
The branch distribution (BD) unit must be installed indoors;
Do not install the BD box in a highly humid environment.
There is risk of product failure and property damage.
Do not make refrigerant substitutions. Use R410A only.
,IDGLIIHUHQWUHIULJHUDQWLVXVHGRUDLUPL[HVZLWKRULJLQDOUHIULJHUDQWWKH
unit will malfunction and be damaged.
'RQRWVWRUHRUXVHÀDPPDEOHJDVFRPEXVWLEOHVQHDUWKH
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 or BD unit in a noise-sen-
sitive 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.
Install the unit in a safe location where nobody can step on
or fall onto it. 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.

5
Safety Instructions
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.
MULTI FMAX
MULTI F
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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:LUHVWKDWDUHWRRVPDOOPD\JHQHUDWHKHDWDQGFDXVHD¿UH
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-
IRUPHGSURSHUO\LWPD\UHVXOWLQ¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
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 are 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.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNDQGSK\VLFDOLQMXU\RUGHDWKGXHWR
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

6
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
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
'RQRWSURYLGHSRZHUWRRURSHUDWHWKHXQLWLILWLVÀRRGHG
or submerged.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
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,
DQGWKHV\VWHPGHYHORSVDUHIULJHUDQWOHDNLWPD\FDXVHD¿UHHOHFWULF
VKRFNH[SORVLRQSK\VLFDOLQMXU\RUGHDWK
To avoid physical injury, use caution when cleaning or
servicing the air conditioner.
CAUTION
&OHDQXSWKHVLWHDIWHUVHUYLFLQJLV¿QLVKHGDQGFKHFNWKDW
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 block the inlet or outlet.
Unit may malfunction.
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 when the panel(s) or protective
FRYHUVDUH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.
SAFETY INSTRUCTIONS

7
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.
MULTI FMAX
MULTI F
TABLE OF CONTENTS
Safety Instructions......................................................................................................................................................................................................3-6
0XOWL)0XOWL)0$;2XWGRRU8QLW6SHFLÀFDWLRQV.................................................................................................................................................8-10
Electrical Data................................................................................................................................................................................................................11
R410ARefrigerant........................................................................................................................................................................................................ 12
General Installation Guidelines..............................................................................................................................................................................13-34
/RFDWLRQ6HOHFWLRQIRU2XWGRRU8QLWV..........................................................................................................................................................................13
Oceanside Installation Precautions............................................................................................................................................................................13
Rooftop Installations...................................................................................................................................................................................................14
Planning for Snow and Ice.......................................................................................................................................................................................... 14
7LH'RZQVDQG/LJKWQLQJ3URWHFWLRQ...........................................................................................................................................................................14
Allowable Clearances............................................................................................................................................................................................15-17
5LJJLQJDQG/LIWLQJ,QVWUXFWLRQV ..................................................................................................................................................................................18
Platform Instructions...................................................................................................................................................................................................19
0RXQWLQJ%ROW/RFDWLRQ...............................................................................................................................................................................................19
/RFDWLRQ6HOHFWLRQIRU%UDQFK'LVWULEXWLRQ8QLW .....................................................................................................................................................20-21
Branch Distribution Unit Installation.......................................................................................................................................................................22-23
Piping Preparation...................................................................................................................................................................................................24-25
Piping Materials and Handling...............................................................................................................................................................................26-34
Refrigerant Piping Connections.............................................................................................................................................................................35-40
Flushing the Refrigerant Piping..................................................................................................................................................................................41
Leak Test and Vacuum Procedures.......................................................................................................................................................................42-44
Refrigerant Charge..................................................................................................................................................................................................45-47
Refrigerant Piping Insulation.................................................................................................................................................................................48-52
Electrical Wiring......................................................................................................................................................................................................53-70
*HQHUDO,QIRUPDWLRQ...............................................................................................................................................................................................53-54
Power Wiring and Communications Cable Connections.......................................................................................................................................55-59
Test Run ..................................................................................................................................................................................................................... 60
DIP Switch Settings...............................................................................................................................................................................................61-65
Self Diagnosis Functions.......................................................................................................................................................................................66-71
Caution for Refrigerant Leakage............................................................................................................................................................................72-73
Installation Checklists.............................................................................................................................................................................................74-79

8
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
SPECIFICATIONS
Model Number LMU18CHV LMU24CHV LMU30CHV LMU36CHV
Cooling Capacity (Btu/h)1(Min.~Rated~ Max.) 8,400~17,000~19,000 8,400~20,000~25,000 8,400~30,000~36,000 8,400~32,000~38,400
Heating Capacity (Btu/h)1 (Min.~Rated~ Max.) 10,248~22,000~24,000 9,240~24,000~28,800 9,240~32,000~38,400 9,240~36,000~41,600
Operating Range
Cooling (°F DB) 147- 118 147- 118 147- 118 147- 118
Heating (°F WB) -4 - 64 -4 - 64 -4 - 64 -4 - 64
Compressor
Inverter Quantity Twin Rotary x 1 Twin Rotary x 1 Twin Rotary x 1 Twin Rotary x 1
Oil Type FVC68D FVC68D FVC68D FVC68D
Fan (Side Discharge)
Type Propeller Propeller Propeller Propeller
Motor Output (W) x Qty. 85.4 x 1 85.4 x 1 124.2 x 1 124.2 x 1
Motor/Drive Brushless Digitally Controlled / Direct
MaximumAir Volume (CFM) 1,766 1,766 2,119 2,119
Unit Data
Refrigerant Type R410A R410A R410A R410A
Refrigerant Control/Location EEV/Outdoor Unit EEV/Outdoor Unit EEV/Outdoor Unit EEV/Outdoor Unit
Min. Number Indoor Units/System22222
Max. Number Indoor Units/System22344
MaximumAllowable Total Indoor Unit
Connected Capacity (Btu/h) 24,000 33,000 40,000 48,000
Sound Pressure (Cooling / Heating) dB(A)3 49 / 52 49 / 52 52 / 55 52 / 55
Net Unit Weight (lbs.) 100 100 137 137
Shipping Weight (lbs.) 108 108 148 148
Power Wiring / Communications Cable
(No. xAWG)4,5 4C x 18 4C x 18 4C x 18 4C x 18
Heat Exchanger
Material and Fin Coating Copper Tube/Aluminum Fin and GoldFin™/Hydrophilic
Rows/Columns/Fins per inch x Qty. (2 x 28 x 14) x 1 (2 x 28 x 14) x 1 (2 x 38 x 14) x 1 (2 x 38 x 14) x 1
Piping
Liquid Line Connection (in., OD) x Qty. 1/4 x 2 1/4 x 3 1/4 x 4 1/4 x 4
Vapor Line Connection (in., OD) x Qty. 3/8 x 2 3/8 x 3 3/8 x 4 3/8 x 4
Factory Charge lbs. of R410A 3.96 3.96 6.18 6.18
Piping Lengths
Maximum Total Piping (ft.)6164.0 246.1 246.1 246.1
Maximum Outdoor Unit to Indoor Unit Piping (ft) 82.0 82.0 82.0 82.0
Piping Length (NoAdditional Refrigerant [ft]) 49.2 73.8 98.4 98.4
Maximum Elevation between Outdoor Unit
and Indoor Unit (ft.) 49.2 49.2 49.2 49.2
Maximum Elevation between Indoor Unit and
Indoor Unit (ft.) 24.6 24.6 24.6 24.6
Table 1: 0XOWL)2XWGRRU8QLW6SHFL¿FDWLRQV
1Rated 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%.
Rated cooling capacity 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).
Rated heating capacity obtained with air entering the indoor unit at 70ºF dry bulb (DB) and
60ºF wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet
bulb (WB).
2At least two indoor units should be connected. For allocated capacity information, see
the combination tables in the "Multi F / Multi F MAX Combination Data Manual" on www.
lg-dfs.com. For performance data, see "Multi F / Multi F MAX Performance Data Manual"
on www.lg-dfs.com.
3Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745 and
are the same in both cooling and heating mode. These values can increase due to ambient
conditions during operation.
43RZHUZLULQJWRWKHRXWGRRUXQLWLV¿HOGVXSSOLHGVROLGRUVWUDQGHGDQGPXVWFRPSO\ZLWK
the applicable local and national codes. For detailed information, please refer to electrical
characteristics on page 11.
5All power wiring / communication cable to be minimum 18AWG from the outdoor unit to
the indoor unit, stranded, shielded or unshielded (if shielded, it must be grounded to the
chassis of the outdoor unit only), and must comply with applicable local and national codes.
For detailed electrical information, please refer to electric characteristics on page 11.
6Piping lengths are equivalent.
7,QVWDOODWLRQRIDQRSWLRQDO/RZ$PELHQW:LQG%DIÀH.LWZLOODOORZRSHUDWLRQGRZQWR)LQ
cooling mode.
Multi F Outdoor Units

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.
MULTI FMAX
MULTI F
SPECIFICATIONS
Multi F MAX Outdoor Units
Table 2: Multi F MAX Outdoor Unit General Data.
Model Number LMU480HV LMU540HV LMU600HV
Cooling Capacity (Btu/h) (Minimum ~ Rated ~ Maximum)114,400~48,000~58,000 14,400~52,500~63,200 15,600~60,000~68,000
Heating Capacity (Btu/h)(Minimum ~ Rated ~ Maximum)115,840~54,000~61,000 16,272~58,000~64,000 17,940~64,000~70,000
Operating Range
Cooling (°F DB) 147- 118 147- 118 147- 118
Heating (°F WB) -4 - 64 -4 - 64 -4 - 64
Compressor
Inverter Quantity Twin Rotary x 1 Twin Rotary x 1 Twin Rotary x 1
Oil Type FVC68D FVC68D FVC68D
Fan (Side Discharge)
Type Propeller Propeller Propeller
Motor Output (W) x Qty. 124.2 x 2 124.2 x 2 124.2 x 2
Motor/Drive Brushless Digitally Controlled/Direct
MaximumAir Volume (CFM) 2,119 x 2 2,119 x 2 2,119 x 2
Unit Data
Refrigerant Type R410A R410A R410A
Refrigerant Control/Location EEV / Outdoor Unit, Branch Distribution Unit
Min. Number Indoor Units/System2222
Max. Number Indoor Units/System2888
MaximumAllowable Total Indoor Unit Connected Capacity (Btu/h) 65,000 73,000 81,000
Sound Pressure ±3 dB(A)3(Cooling / Heating) 54 / 56 54 / 56 56 / 58
Net Unit Weight (lbs.) 214 214 223
Shipping Weight (lbs.) 236 236 249
Power/Communications Wiring Between ODU and BD Unit
(No. XAWG)4,5 4C X 16 4C X 16 4C x 16
Heat Exchanger
Material and Fin Coating Copper Tube /Aluminum Fin and GoldFin™/Hydrophilic
Rows/Columns/Fins per inch x Qty. (2 x 32 x 14) x 2 (2 x 32 x 14) x 2 (3 x 32 x 14) x 2
Piping
Liquid Line Connection (in., OD) x Qty. 3/8 x 1 3/8 x 1 3/8 x 1
Vapor Line Connection (in., OD) x Qty. 3/4 x 1 3/4 x 1 3/4 x 1
Factory Charge lbs. of R410A 9.7 9.7 12.3
Piping Lengths
Maximum Total System Piping (ft.)6475.7 475.7 475.7
Maximum Main Pipe Length (Outdoor Unit to BD Unit [ft.]) 180.4 180.4 180.4
Total Branch Piping (BD Units to all Indoor Units [ft.]) 295.3 295.3 295.3
Maximum Branch Pipe Length (Length between each
BDU and IDU [ft.]) 49.2 49.2 49.2
Maximum Outdoor Unit to Indoor Unit Pipe Length (ft.) 229.6 229.6 229.6
Max. Main Piping Length (NoAdditional Refrigerant (ft.) 16 16 16
Max. Branch Piping Length (NoAdditional Refrigerant (ft.) 131 131 147.6
Maximum Elevation between Outdoor Unit and Indoor Unit (ft.) 98.4 98.4 98.4
Maximum Elevation between Indoor Unit and Indoor Unit (ft.) 49.2 49.2 49.2
Maximum Elevation between BD Unit and Indoor Unit (ft.) 32.8 32.8 32.8
Maximum Elevation between BD Unit and BD Unit (ft.) 49.2 49.2 49.2
1Rated capacityapplied with non-ductedindoor units,and israted 0 ft.above sealevel with a0
ft. leveldifference betweenoutdoor andindoor units.All capacities arenet with acombination
ratiobetween 95 – 105%.
Rated coolingcapacity obtained withair enteringthe indoorunit at 80ºFdry bulb(DB) and 67ºF
wet bulb(WB) andoutdoor ambient conditionsof 95ºFdry bulb(DB) and75ºF wet bulb(WB).
Rated heatingcapacity obtained withair enteringthe indoorunit at 70ºFdry bulb(DB) and 60ºF
wetbulb (WB) and outdoorambient conditions of 47ºFdry bulb (DB) and43ºF wet bulb (WB).
2At least one Branch Distribution Unit is required for system operation; a maximum of two can
be installed per outdoor unit with use of Y-branch accessory (PMBL5620).At least two indoor
units should be connected. For allocated capacity information, see the combination tables in
the “Multi F / Multi F MAX Combination Data Manual” on www.lg-dfs.com. For performance
data, see “Multi F / Multi F MAX Performance Data Manual” on www.lg-dfs.com.
3Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745.
These values can increase due to ambient conditions during operation.
43RZHUZLULQJWRWKHRXWGRRUXQLWLV¿HOGVXSSOLHGVROLGRUVWUDQGHGDQGPXVWFRPSO\ZLWK
the applicable local and national codes. For detailed information, please refer to electrical
characteristics on page 11.
5All power wiring / communication cable to be minimum 16AWG from the outdoor unit to
the BD unit (Multi F MAX systems only), and 18AWG from the BD unit to the indoor unit,
stranded, shielded or unshielded (if shielded, it must be grounded to the chassis of the
outdoor unit only), and must comply with applicable local and national codes. For detailed
electrical information, please refer to electric characteristics on page 11.
6Piping lengths are equivalent.
7,QVWDOODWLRQRIDQRSWLRQDO/RZ$PELHQW:LQG%DIÀH.LWZLOODOORZRSHUDWLRQGRZQWR)LQ
cooling mode.

10
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
SPECIFICATIONS
Multi F MAX Branch Distribution Units
Table 3: Multi F MAX BD Unit General Data.
Model Number PMBD3620 PMBD3630 PMBD3640 PMBD3641
No. of Connectible Indoor Units11-2 1-3 1-4 1-4
Max. Nominal Capacity / Port (Btu/h)224,000 24,000 24,000 24,000 forA,B,C Ports;
36,000 for D Port
Max. Nominal Capacity / BD Unit (Btu/h) 48,000 72,000 73,000 73,000
Operation Temperature Range (°F DB) 0 ~ 150 0 ~ 150 0 ~ 150 0 ~ 150
Unit Data
Refrigerant Type R410A R410A R410A R410A
Power Supply V, Ø, Hz 208-230, 1, 60 208-230, 1, 60 208-230, 1, 60 208-230, 1, 60
Power Input (W) 16 24 32 32
RatedAmps (A) 0.08 0.12 0.16 0.16
Dimensions W x H x D (in.) 17-3/32 x 6-13/32
x 10-23/32 17-3/32 x 6-13/32 x 10-23/32 17-3/32 x 6-13/32 x 10-23/32 17-3/32 x 6-13/32 x 10-23/32
Net Unit Weight (lbs.) 13 14.3 15.7 15.7
Shipping Weight (lbs.) 15 17 18 18
Power Wiring / Communication Cables3
From Outdoor Unit to BD Unit (Qty. xAWG)34 x 16 4 x 16 4 x 16 4 x 16
From BD Unit to Indoor Unit (Qty. xAWG)34 x 18 4 x 18 4 x 18 4 x 18
Piping Connections
Outdoor Unit to
BD Unit Liquid (in., OD) Ø3/8 Ø3/8 Ø3/8 Ø3/8
Vapor (in., OD) Ø3/4 Ø3/4 Ø3/4 Ø3/4
BD Unit to
Indoor Units
Liquid (in., OD) x Qty. Ø1/4 x 2 Ø1/4 x 3 Ø1/4 x 4 Ø1/4 x 4
Vapor (in., OD) x Qty. Ø3/8 x 2 Ø3/8 x 3 Ø3/8 x 4 Ø3/8 x 3
Ø1/2 x 1
Piping Lengths
Maximum Total System Piping (ft.)4475.7 475.7 475.7 475.7
Maximum Main Pipe Length (Outdoor Unit
to BD Units [ft.]) 180.4 180.4 180.4 180.4
Maximum Total Branch Piping (BD Units to
Indoor Units [ft.]) 295.3 295.3 295.3 295.3
Maximum Branch Pipe Length Between
BD Unit and Each Indoor Unit [ft.]) 49.2 49.2 49.2 49.2
Maximum Outdoor Unit to Indoor Unit
Pipe Length (ft.) 229.6 229.6 229.6 229.6
Main Piping Length (NoAdditional
Refrigerant (ft.) 16 16 16 16
Branch Piping Length (NoAdditional
Refrigerant (ft.) 131 131 131 131
Maximum Elevation between BD Unit and
Indoor Unit (ft.) 32.8 32.8 32.8 32.8
Maximum Elevation between BD Unit and
BD Unit (ft.) 49.2 49.2 49.2 49.2
1At least one Branch Distribution Unit is required for system operation; a maximum of two can be installed per outdoor unit with use of Y-branch accessory (PMBL5620)To connect only
one (1) indoor unit to a branch distribution unit, the system must include another branch distribution unit with at least one (1) connected indoor unit.
2 Branch Distribution Unit can accommodate from one (1) indoor unit up to four (4) indoor units depending on the ports available on the Branch Distribution Unit.
3All power wiring / communication cable to be minimum 16AWG from the outdoor unit to the BD unit (Multi F MAX systems only), and 18AWG from the BD unit to the indoor unit,
stranded, shielded or unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only), and must comply with applicable local and national codes. For detailed electrical
information, please refer to electric characteristics on page 11.
4Piping lengths are equivalent.

11
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.
MULTI FMAX
MULTI F
ELECTRICAL DATA
Nominal
Tons Unit Model No. Hertz Voltage Phase Voltage
Range
(Min. to Max.) MCA MOP Compressor
Quantity Compressor Motor RLA Outdoor Fan Motor Indoor
Fan
Motor
kW FLA FLA
1.5 LMU18CHV
60 208 - 230 1 187 - 253
13.3 20 1 8.9 0.09 0.59 1.60
2 LMU24CHV 14.3 20 1 9.4 0.09 0.59 2.00
2.5 LMU30CHV 16.6 25 1 10.8 0.12 0.73 2.40
3 LMU36CHV 17.9 25 1 11.2 0.12 0.73 3.20
Voltage tolerance is ±10%.
Maximum allowable voltage unbalance is 2%.
RLA = Rated Load Amps.
MCA= Minimum CircuitAmpacity.
Maximum Overcurrent Protection (MOP) is calculated as
follows: (Largest motor FLAx 2.25) + (Sum of other motor
FLA) rounded down to the nearest standard fuse size.
Indoor Fan Motor (FLA) is based on the maximum combina-
tion of indoor units.
The max combination for each outdoor unit is:
- 18,000 ODU (LMU18CHV): 12,000 IDU x 2
- 24,000 ODU (LMU24CHV): 12,000 IDU x 2 + 9,000 IDU
x 1
- 30,000 ODU (LMU30CHV): 12,000 IDU x 3
- 36,000 ODU (LMU36CHV): 12,000 IDU x 4
Table 4: Multi F Outdoor Unit Electrical Data.
Nominal
Tons Unit Model No. Hertz Voltage Phase Voltage
Range
(Min. to Max.) MCA MOP Compressor
Quantity Compressor Motor RLA
Condenser Fan Motor(s) Indoor
Fan
Motor
Condenser
Fan Quantity
x kW
Condenser
Fan Motor
FLA
4.0 LMU480HV 60 208 - 230 1187 - 253 27.3 40 1 17.5 2 x 0.12 0.73 x 2 4.0
4.5 LMU540HV 60 208 - 230 187 - 253 29.4 40 1 18.5 2 x 0.12 0.73 x 2 4.8
5.0 LMU600HV 60 208 - 230 187 - 253 32.2 45 1 20.4 2 x 0.12 0.73 x 2 5.2
Voltage tolerance is ±10%.
Maximum allowable voltage unbalance is 2%.
RLA = Rated Load Amps.
MCA= Minimum CircuitAmpacity.
Maximum Overcurrent Protection (MOP) is calculated as
follows: (Largest motor FLAx 2.25) + (Sum of other motor
FLA) rounded down to the nearest standard fuse size.
Indoor Fan Motor (FLA) is based on the maximum combina-
tion of indoor units.
The max combination for each outdoor unit is:
- 48,000 ODU (LMU480HV): 12,000 IDU x 5
- 54,000 ODU (LMU540HV): 12,000 IDU x 6
- 60,000 ODU (LMU6000HV): 12,000 IDU x 6 + 9,000 IDU
x 1
Table 5: Multi F MAX Electrical Data.
Multi F and Multi F MAX Outdoor Units

12
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
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
Note
•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.
R410A REFRIGERANT

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.
MULTI FMAX
MULTI F
Selecting the Best Location for the 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
do so will 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:
•Alocation strong enough to bear the weight of the outdoor unit.
•Alocation that allows for optimum air flow and is easily accessible for inspection, maintenance, and service.
•Where piping between the outdoor unit, indoor unit(s), and BD units (Multi F MAX systems only) are 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.
•:KHUHLWZLOOQRWEHVXEMHFWHGWRGLUHFWWKHUPDOUDGLDWLRQIURPRWKHUKHDWVRXUFHVQRUDQDUHDWKDWZRXOGQRWH[SRVHWKHRXWGRRUXQLWWRKHDW
or steam like discharge from boiler stacks, chimneys, steam relief ports, other air conditioning units, kitchen vents, plumbing vents, and
RWKHUVRXUFHVRIH[WUHPHWHPSHUDWXUHV
•Where high-frequency electrical noise / electromagnetic waves will not affect operation.
•Where operating sound from the unit will not disturb inhabitants of surrounding buildings.
•:KHUHWKHXQLWZLOOQRWEHH[SRVHGWRGLUHFWVWURQJZLQGV
GENERAL INSTALLATION GUIDELINES
Location for 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
Before beginning installation, read the safety summary at the beginning of this manual.

14
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
Tie-Downs and Lightning Protection
Tie-Downs
• 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.
• 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.
• Ahigh-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: Lightening Protection Diagram.
Table 6: 6DIHW\=RQH6SHFL¿FDWLRQV
Building Height (feet) 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.
GENERAL INSTALLATION GUIDELINES
Location for Outdoor Unit
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.
Planning for 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
must be high enough to allow the unit to remain above possible snow drifts. Mount the unit on a field-provided stand that is higher than the
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.
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

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.
MULTI FMAX
MULTI F
Clearance Requirements when Different Obstacles are Present (Unit: Inch)
Minimum 12"
Minimum 12"
Minimum 12"
Minimum 24"
Obstacle on the suction side only. Obstacles on the suction side and
on both left and right sides.
Service Access and Allowable Clearances for Outdoor Unit
GENERAL INSTALLATION GUIDELINES
Minimum 12
Air inlet grille
Blown
air
Strong
wind
Strong
wind
Minimum 12
Minimum 24
Sunroof
Fence or
obstacles
Minimum 12
Air inlet grille
Blown
air
Strong
wind
Strong
wind
Minimum 20
Fence or
obstacles
Unit: Inch
Minimum 12
Ensure that the space at the back of the outdoor unit is a minimum of 11-13/16 inches, and
include a minimum of 23-5/8 inches at the right side of the unit for service. If the outdoor unit discharge side faces a wall, include a minimum of 19-11/16 inches between the outdoor unit and the wall. Install the outdoor unit so that the discharge port is
set at a right angle to the wind direction.
Outdoor Unit Service Access and Allowable Clearances
Appropriate airflow through the outdoor unit coil is critical for proper unit operation.
• Include enough space for airflow and for service access. If installing multiple outdoor units, avoid placing the units where the discharge of
one unit will blow into the inlet side of an adjacent unit.
• No obstacles to air circulation around the unit; keep proper distances from ceilings, fences, floor, walls, etc. (Install a fence to prevent pests
from damaging the unit or unauthorized individuals from accessing it.)
• If an awning is built over the unit to prevent direct sunlight or rain exposure, make sure that the discharge air of the outdoor unit isn’t restricted.
When installing the outdoor unit, consider service, inlet, and outlet, and minimum allowable space requirements as illustrated in the following
diagrams.

16
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
Minimum 12"
Minimum 20"
Minimum 40"
Minimum 12"
Maximum 20"
Minimum 12"
Minimum 40"
Minimum 24"
Obstacles above and on the air intake side. Obstacles above, on the air intake side,
and on both left and right sides
Minimum 20"
Minimum 20"
Minimum 20"
Minimum 40"
Obstacle just on the
air discharge side.
Obstacles above and on the
air discharge side.
Clearance Requirements when Different Obstacles are Present, continued. (Unit: Inch)
Allowable Clearances for Outdoor Unit
GENERAL INSTALLATION GUIDELINES

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.
MULTI FMAX
MULTI F
L
Minimum 40"
Minimum 40"
Maximum 20"
Minimum 12"
Where there are obstacles on both suction
and discharge sides (discharge side obstacle
is lower than the outdoor unit).
Where there are obstacles above, and on both
suction and discharge sides (discharge side obstacle
is lower than the outdoor unit).
Minimum 20"
Minimum 12"
H
Minimum 12"
Minimum 79"
Minimum 24"
Minimum 40"
Series installation
³/´VKRXOGEHORZHUWKDQ³+´,I
a stand is necessary, it should
be contained (not open frame)
to prevent the discharge air from
short cycling.
Allowable Clearances for Outdoor Unit
GENERAL INSTALLATION GUIDELINES
Where there are obstacles on both suction
and discharge sides (discharge side obstacle
is higher than the outdoor unit).
Minimum 20"
Minimum 12"
Table 7: Ratio among H,A, and L.
If a stand is necessary, it should be contained
(not open frame) to prevent the discharge air from
short cycling.
LA
L H /+ 30 inches
1/2 H < L 40 inches
H <L 6HW6WDQGDV/+
Where there are obstacles above, and on both
suction and discharge sides (discharge side obstacle
is higher than the outdoor unit).
Maximum 20"
Minimum 12"
Minimum 40"
L
H
A

18
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
GENERAL INSTALLATION GUIDELINES
Rigging Instructions / Platform Instructions for Outdoor Unit
Rigging and Lifting Instructions
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.
Wear protective gloves when handling equipment. Sharp edges may cause personal injury.
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.
CAUTION
•Make sure the outdoor unit is in its original packaging to avoid damage during local transport.
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claims agent immediately.
•Handle the outdoor unit with care. Keep the outdoor unit upright to avoid damaging inside components.
•If a forklift is to transport the outdoor unit, the forklift arms should pass through the openings at the bottom.
•If a crane is to suspend the outdoor unit, it is recommended that two (2) ropes at least twenty-three (23) feet in length be used.
•Pass the ropes under the unit. Pass the rope through the two (2) forklift slots each at the front and rear of the outdoor unit.
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•Always include padding to protect the outdoor unit from rope damage, and take into consideration the outdoor unit’s center of gravity.
Anchoring the Outdoor Unit
• Tightly anchor the outdoor unit with a bolt and nut to a concrete or rigid platform.
• When installing on a wall (with field-supplied brackets), roof, or rooftop, securely anchor the
mounting platform with nails, taking into consideration the possibility of strong winds or earth-
quakes.
• If there is a possibility of vibration from the outdoor unit transmitting to the building, add an
anti-vibration material to the platform.
M10
Anchor Bolt
2-3/4~4-23/32
13/16
Unit: Inch
Figure 2: Example of Using an Insert for
a Hole in a Reinforced Concrete Beam.
Concrete Beam
Insert
Suspension Bolt
Polyblock /
Anti-Vibration
Material
Nail Securing
Polyblock
Concrete Platform Specifications
• Concrete foundations should be made of one part cement, two parts sand, and four parts gravel.
• The surface of the foundation should be finished with mortar with rounded edges, and weather-
proofed.
Figure 3: Close up of BoltAttachment.

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.
MULTI FMAX
MULTI F
Bolt Refrigerant Pipe
Connection Location
Top of Outdoor Unit
(Looking Down)
Bolt
Bolt
Bolt
Bolting the Outdoor Unit to the Platform
1. Ensure that the concrete platform will not degrade easily, and has enough
strength to bear the weight of the unit.
2. Include an H-beam support. Firmly attach the corners, otherwise the support
will bend.
3. Use a hexagon nut.
4. Use anti-vibration material.
5. Include enough space around the concrete foundation for condensate
drainage.
6. Seal all wiring and piping access holes to prevent bugs from entering the
unit.
Outdoor Unit Foundation Requirements.
Figure 4: LMU18CHV and LMU24CHV Outdoor Units.
Minimum
8
7-7/8
15-3/4 Minimum 24-13/32
Unit: Inch
Outdoor Unit Type Bolt
Type Concrete Height Bolt Depth
LMU18CHV, LMU24CHV,
LMU30CHV, LMU36CHV M10-J Minimum 4 inches Minimum 3 inches
LMU480HV, LMU540HV,
LMU600HV M10-J Minimum 8 inches Minimum 3 inches
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Figure 5: LMU30CHV and LMU36CHV Outdoor Units.
Minimum
3-15/16
21-1/2 Minimum 14-9/16
Unit: Inch
Outdoor Unit Platform Requirements
Figure 6: LMU480HV, LMU540HV, LMU600HV Outdoor Units.
Figure 7: Bolting the Outdoor Unit to the Platform (Piping
Location May Differ Depending on Outdoor Unit Model).
Minimum
3-15/16)
21-1/2 Minimum 14-9/16
Unit: Inch
GENERAL INSTALLATION GUIDELINES
Platform Instructions for Outdoor Unit

20
MULTI F / MULTI F MAX Outdoor Unit 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.
MULTI FMAX
MULTI F
GENERAL INSTALLATION GUIDELINES
Selecting the Best Location for the Branch Distribution (BD) Unit
Branch Distribution (BD) units are used only with Multi F MAX systems to distribute the refrigerant from the outdoor unit to up to eight indoor
units. Select location indoors that will meet the following conditions:
• Within allowable parameters for proper connection to the Multi F MAX outdoor unit and indoor unit(s); refrigerant piping and wire lengths
must not exceed amounts specified by LG Electronics, U.S.A., Inc.
• Condensate drain piping is not required.
• Ensure there is enough space in the installation area for service and inspection purposes (23-5/8 inch square opening).
• Install the refrigerant piping and electrical wiring system in an easily accessible location.
• Level where there is enough strength to bear the weight of the BD unit.
• Interior installation is highly recommended.
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• Unit can be installed no more than ±5 degrees of level.
•Do not install the BD unit in a location where it would be subjected to strong radiation heat from heat sources.
• Avoid an installation environment where the BD unit would be exposed to heat, water, steam, oil splattering, spray or other factors that may
damage the PCB.
• Install the unit in a location where any sound it generates will not disturb occupants in the surrounding rooms.
• No obstacles to air circulation around the unit; keep proper distances from ceilings, doorways, floor, walls, etc.
• Where high-frequency electrical noise / electromagnetic waves will not affect operation. Maintain proper distances between the BD unit(s)
and electric wires, audio and visual appliances, breaker / circuit panels, etc.
Location for Multi F MAX Branch Distribution Units
PCB
1-31/321-3/16
4-3/8
Service Direction
Piping to
Indoor Units
Service Direction
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