LG MULTI F MAX User manual

CEILING CASSETTE
INDOOR UNIT
INSTALLATION MANUAL
MAX
MULTI F
MULTI F
• LCN188HV4 18 kBtu• LMCN078HV 7 kBtu
• LCN098HV4 9 kBtu
• LCN128HV4 12 kBt

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 below.
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.
A summary list of safety precautions begins on page 3.
For more technical materials such as submittals, engineering
databooks, and catalogs, visit www.lghvac.com.
For continual product development, LG Electronics U.S.A., Inc., reserves the right to change specifications without notice.
©LG Electronics U.S.A., Inc.
This document, as well as all reports, illustrations, data, information, and other materials are the property of 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.
This document is for design purposes only.

3
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.
MAX
MULTI F
MULTI F
SAFETY INSTRUCTIONS
Do not install or remove the unit by yourself (end-user).
Ask the dealer or a trained technician to install the unit.
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explosion, electric shock, physical injury or death.
For replacement of an installed unit, always contact an
LG trained service provider.
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The outdoor unit is shipped with refrigerant and the service
valves closed. Do not open service valves on the unit until
all non-condensibles have been removed from the piping
system and authorization has been obtained from the
commissioning agent.
There is a risk of physical injury or death.
Do not run the compressor with the service valves closed.
There is risk of explosion, physical injury, or death.
Periodically check that the outdoor unit is not damaged.
There is risk of explosion, physical injury, or death.
Replace all control box and panel covers.
If cover panels are not installed securely, dust, water and animals will
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Wear protective gloves when handling equipment. Sharp
edges will cause personal injury.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Exposure to high concentration levels of refrigerant gas will lead to ill-
ness or death.
Do not install the unit using defective hanging, attaching,
or mounting hardware.
There is risk of physical injury or death.
Dispose of the packing materials safely.
• Packing materials, such as nails and other metal or wooden parts
will cause puncture wounds or other injuries.
• Tear apart and throw away plastic packaging bags so that children
will not play with them and risk suffocation and death.
Do not install the unit in any location exposed to open
ÀDPHRUH[WUHPHKHDW Do not touch the unit with wet
hands.
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death.
Install the unit considering the potential for strong winds or
earthquakes.
Improper installation will cause the unit to fall, resulting in physical injury
or death.
Do not change the settings of the protection devices.
If the pressure switch, thermal switch, or other protection device shorted
DQGIRUFHGWRRSHUDWHLPSURSHUO\RUSDUWVRWKHUWKDQWKRVHVSHFL¿HGE\
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injury or death.
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.
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 must not be completed.
DANGER
WARNING
CAUTION
INSTALLATION
DANGER
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4
Multi F Ceiling Cassette Indoor Unit
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
MULTI F
MULTI F
SAFETY INSTRUCTIONS
INSTALLATION - CONTINUED
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 of ASHRAE (American Society of Heating,
Refrigerating, and Air Conditioning Engineers) Standard 15. If the
refrigerant leaks and safety limits are exceeded, it could result in per-
sonal injuries or death from oxygen depletion.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as un-insulated piping can generate condensate
that could drip, causing a slippery surface that creates a risk of slipping,
falling, and personal injury.
WARNING
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as un-insulated piping can generate condensate that
will drip and cause a slippery surface condition and/or water damage to
walls.
When installing the unit in a hospital, mechanical room, or
VLPLODUHOHFWURPDJQHWLF¿HOG(0)VHQVLWLYHHQYLURQPHQW
SURYLGHVXI¿FLHQWSURWHFWLRQDJDLQVWHOHFWULFDOQRLVH
Inverter equipment, power generators, high-frequency medical equip-
ment, or radio communication equipment will cause the air conditioner to
operate improperly. The unit will also affect such equipment by creating
electrical noise that disturbs medical treatment or image broadcasting.
Do not use the product for special purposes such as pre-
serving foods, works of art, wine coolers, or other precision
air conditioning applications. This equipment is designed to
provide comfort cooling and heating.
There is risk of property damage.
Do not make refrigerant substitutions. Use R410A only.
If a different refrigerant is used, or air mixes with original refrigerant, the
unit will malfunction and become damaged.
Do not install the unit in a noise sensitive area.
When connecting refrigerant tubing, remember to allow for
pipe expansion.
Improper piping will cause refrigerant leaks and system malfunction.
'RQ¶WVWRUHRUXVHÀDPPDEOHJDVFRPEXVWLEOHVQHDUWKH
unit.
There is risk of product failure.
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim or destroy R410A refrigerant ac-
cording to applicable U.S. Environmental Protection Agency
(EPA) rules.
Periodically check that the unit is not damaged.
There is a risk of equipment damage.
Install the unit in a safe location where no one can step on or
fall onto it. Do not install the unit with defective hanging,
attaching, or mounting hardware.
There is risk of unit and property damage.
Install the drain hose to ensure adequate drainage.
There is a risk of water leakage and property damage.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels will cause product failure.
The unit is shipped with refrigerant and the service valves
closed. Do not open service valves on the unit until all
non-condensibles have been removed from the piping sys-
tem and authorization to do so has been obtained from the
commissioning agent.
There is a risk of refrigerant contamination, refrigerant loss and equip-
ment damage.
Do not run the compressor with the service valves
closed.
There is a risk of equipment damage.
CAUTION
Be very careful when transporting the product. Failure to follow these directions will result in minor or moderate physical injury.
•Do not attempt to carry the product without assistance.
• Some products use polypropylene bands for packaging. Do not use polypropylene bands to lift the unit.
• Suspend the unit from the base at specified positions.
• Support the unit a minimum of four points to avoid slippage from rigging apparatus.

5
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.
MAX
MUL
TI F
MULTI F
SAFETY INSTRUCTIONS
The information contained in this manual is intended for use
E\DQLQGXVWU\TXDOL¿HGH[SHULHQFHGWUDLQHG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.
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
SHUIRUPHGSURSHUO\LWZLOOUHVXOWLQ¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RU
death.
Refer to local, state, and federal codes, and use power wires
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:LUHVWKDWDUHWRRVPDOOZLOO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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cal injury or death.
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 National Electrical Codes and these
instructions when wiring.
Improper connections and inadequate grounding can cause accidental
injury or death.
Always ground the unit following local, state, and National
Electrical Codes.
Turn the power off at the nearest disconnect before servicing
the equipment.
Electric shock can cause physical injury or death.
Properly size all circuit breakers or fuses.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNH[SORVLRQSK\VLFDOLQMXU\RUGHDWK
Do not cut, lengthen or shorten the communications and
power cable between any dry contact unit and its connected
indoor unit. Do not install the unit in a location where the
communications and power cable cannot be safely and easily
connected between the two units. Do not allow strain on
this cable.
Poor cable connections can cause equipment 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 and property damage.

6Due 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
MUL
TI F
MULTI F
SAFETY INSTRUCTIONS
OPERATION
DANGER
'RQRWSURYLGHSRZHUWRRURSHUDWHWKHXQLWLILWLVÀRRGHG
or submerged.
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Use a dedicated power source 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 that the hardware securing the unit has not
deteriorated.
If the unit falls from its installed location, it can cause physical injury or
death.
If refrigerant gas leaks out, ventilate the area before operat-
ing 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ZLOOFDXVH¿UHHOHFWULF
shock, explosion, physical injury or death.
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that no metal scraps, screws, or bits of wiring have been left
inside or surrounding the unit.
Do not use this equipment in mission critical or special-
purpose applications such as preserving foods, works of art,
wine coolers or refrigeration. This equipment is designed to
provide comfort cooling and heating.
Provide power to the compressor crankcase heaters at least
six (6) hours before operation begins.
Starting operation with a cold compressor sump(s) will 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 will malfunction.
Securely attach the electrical cover to the indoor unit.
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Periodically verify the equipment mounts have not deteriorated.
If the base collapses, the unit could fall and cause property damage or
product failure.
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure.
2LOVWHDPVXOIXULFVPRNHHWFFDQVLJQL¿FDQWO\UHGXFHWKH
performance of the unit, or damage its parts.
Use a only soft cloth to clean the air conditioner. Do not
use wax, thinner, or strong detergents.
Strong cleaning products will damage the surface of the air conditioner,
or will cause its appearance to deteriorate.
WARNING
Do not allow water, dirt, or animals to enter the unit.
7KHUHLVULVNRIXQLWIDLOXUH¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Avoid excessive cooling and periodically perform ventila-
tion to the unit.
Inadequate ventilation is a health hazard.
Do not touch refrigerant piping during or after operation.
It can cause burns or frostbite.
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.
Periodically verify the equipment mounts have not
deteriorated.
If the base collapses, the unit could fall and cause physical injury or death.
Periodically check power cable and connection for damage.
Cable must be replaced by the manufacturer, its service agent, or similar
TXDOL¿HGSHUVRQVLQRUGHUWRDYRLGSK\VLFDOLQMXU\DQGRUHOHFWULFVKRFN
Securely attach the electrical cover to the unit.
Non-secured electrical covers can result in burns or electric shock due to
dust or water in the service panel.
Do not open the inlet grille of the unit during operation.
Do not operate the unit with the panels or guards re-
moved. Do not insert hands or other objects through the
inlet or outlet when the unit is powered. Do not touch the
HOHFWURVWDWLF¿OWHULIWKHXQLWLQFOXGHVRQH
The unit contains sharp, rotating, hot, and high voltage parts that can
cause personal injury and/or electric shock.
Ensure no power is connected to the unit other than as
directed in this manual. Remove power from the unit before
removing or servicing the unit.
7KHUHLVULVNRIXQLWIDLOXUH¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
CAUTION
To avoid physical injury, use caution when cleaning or servicing the air conditioner.

7
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.
MAX
MUL
TI F
MULTI F
TABLE OF CONTENTS
Safety Instructions ...................................................................................................................................................................................................... 3-6
Unit Nomenclature.......................................................................................................................................................................................................... 8
Introduction................................................................................................................................................................................................................ 9-10
General Data ............................................................................................................................................................................................................ 11-15
R410A Refrigerant.......................................................................................................................................................................................................11
6SHFL¿FDWLRQV ............................................................................................................................................................................................................. 12
Dimensions............................................................................................................................................................................................................ 13-14
Refrigerant Piping Diagram ........................................................................................................................................................................................ 15
Installation................................................................................................................................................................................................................16-29
Unpack and Inspect.................................................................................................................................................................................................... 16
Indoor Unit Location Selection............................................................................................................................................................................... 17-18
Preparing the Installation Area ................................................................................................................................................................................... 19
Hanging the Indoor Unit.............................................................................................................................................................................................. 20
Indoor Unit Connections........................................................................................................................................................................................21-22
Flaring Procedure..................................................................................................................................................................................................23-24
Outdoor Unit to Indoor Unit Connections............................................................................................................................................................... 25-29
General Installation Guidelines..............................................................................................................................................................................30-32
Install the Condensate Drain Pipe.............................................................................................................................................................................. 30
Refrigerant Piping....................................................................................................................................................................................................... 31
Insulating Refrigerant Piping ...................................................................................................................................................................................... 32
Wiring .......................................................................................................................................................................................................................33-44
General Guidelines..................................................................................................................................................................................................... 33
Power Wiring / Communication Cable Connections................................................................................................................................................... 34
3RZHU6XSSO\3RZHU:LULQJ6SHFL¿FDWLRQV.............................................................................................................................................................. 35
&RPPXQLFDWLRQ&RQQHFWLRQ&DEOH6SHFL¿FDWLRQV............................................................................................................................................... 36-37
&RQWUROOHU2SWLRQVDQG&RQQHFWLRQ6SHFL¿FDWLRQV ................................................................................................................................................38-40
Indoor Unit Electrical Connections ........................................................................................................................................................................41-43
Optional Wall-Mounted Controller and Sensor ........................................................................................................................................................... 44
Final Installation Procedures ................................................................................................................................................................................. 45-46
Decorative Grille Kit Installation ................................................................................................................................................................................. 45
Installing Batteries ...................................................................................................................................................................................................... 46
Troubleshooting ...................................................................................................................................................................................................... 47-48
Error Codes ..........................................................................................................................................................................................................47-48
Installation Checklist............................................................................................................................................................................................... 49-50

8
Multi F Ceiling Cassette Indoor Unit
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
MUL
TI F
MULTI F
UNIT NOMENCLATURE
Multi F Multi-Zone Systems —Indoor Units
MCN 078 HV
Features:
H = Heat Pump
S = High Efficiency
V = Inverter
T = High Wall-Mounted Indoor Unit
P = Art Cool Gallery Indoor Unit
Nominal Capacity
(Nominal cooling capacity in Btu/h):
Component:
AN: Art Cool™ Wall-Mounted Indoor Unit
N: Standard Wall-Mounted Indoor Unit
CN: Four-Way Ceiling-Cassette Indoor Unit
DN: Ceiling-Concealed Duct (Low Static) Indoor Unit
HN: Ceiling-Concealed Duct (High Static) Indoor Unit
VN: Vertical-Horizontal Air Handling Indoor Unit
L = LG
078 = 7,000
098 = 9,000
128 = 12,000
188 = 18,000
L
• Voltage for all equipment is 208-230V, 60 Hz, 1-phase.
• All indoor units are compatible with wired controllers
4
Generation or Revision
1 = First
2 = Second
3 = Third
4 = Fourth or Multi-compatible
Frame Type:
M = Multi-Zone
A/S = Single Zone (Gen 4, 5 Single Zone units also compatible
with Multi Zone)

9
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.
MAX
MULTI F
MULTI F
INTRODUCTION
Multi F and Multi F MAX Ceiling
Cassette Units
This manual describes how to install the LG Multi F and Multi F MAX (Multi Zone) Ceiling
Cassette Indoor Units (IDU) for Multi F heat pump systems. The table on the next page
lists the available models. Refer to LG’s Multi F Indoor Unit Engineering Manual for
complete detailed engineering data and selection procedures.
Safety
Safety of personnel is the primary concern during all procedures. Read and understand
the safety summary at the front of this manual. Read and understand this installation
procedure before beginning installation. Use the appropriate tools and accessories
during installation. Plan your work and do not work alone, if possible. Know how to
obtain emergency medical and fire fighting assistance.
Installation Personnel
This equipment is intended for installation by personnel trained in the required construction, mechanical, electrical, and/or other disciplines.
WARNING
Installation work must be performed by trained personnel and in accordance with national wiring standards and all local or other applicable codes.
,PSURSHULQVWDOODWLRQFDQUHVXOWLQ¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Please read all instructions before installing this product. Become familiar with the unit’s components and connections, and the order of installation.
Incorrect installation can degrade or prevent proper operation.
• Connecting cable (power and control)
• Pipes - vapor line and liquid line, with
insulation
• 3/8” or 1/2” Threaded hanger rods
• 3/8” or 1/2” nuts, flat washers, and lock /
split washers
• Additional drain hose
• Insulation for additional drain hose
Required Parts (field provided)
Figure 1: Multi F LCN188HV4 Ceiling Cassette
Indoor Unit.
Typical Unit Model Number Nominal Capacity
Cooling (Btu) Heating (Btu)
LMCN078HV 7,000 8,100
LCN098HV4 9,000 10,400
LCN128HV4 12,000 13,800
LCN188HV4 18,000 20,800
Table 1: Multi F Ceiling Cassette Indoor Units.

10
Multi F Ceiling Cassette Indoor Unit
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
MUL
TI F
MULTI F
Part Quantity Image Part Quantity Image
Drain Hose One (1) Cable Ties Four (4)
Metal
Clamp Two (2) Conduit Bracket One (1)
Insulation
for Fittings
One (1)
Set M4 Screws Two (2)
Washers for
Hanging
Bracket
Eight (8)
Wireless
Handheld
Controller with
Holder
(AKB73757604)1
One (1)
Connectors
(included only
for single-zone
system
installations)
2QH(DFKIRULQFKĺLQFK
2QH(DFKIRULQFKĺLQFK
2QH(DFKIRULQFKĺLQFK
INTRODUCTION
Table 2: Included Items.
1Wireless Handheld Controller for the four-way ceiling cassette indoor units is also referenced by Model No. PQWRHQ0FDB.
Table 3: Required Accessory Table.
Part Quantity Image
Grille Kit (PT-QCHW0 or PT-UQC) One (1)
For Vapor Piping For Liquid Piping

11
Installation Manual
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©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
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MULTI F
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GENERAL DATA
R410A Refrigerant
R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant. All piping system materials installed must have a higher
resisting pressure than the materials traditionally used in R22 systems.
R410A refrigerant is an azeotrope of R32 and R125, mixed at 50:50. The ozone depletion potential (ODP) is 0.
WARNING
•Do not place refrigerant cylinder in direct sunlight. Refrigerant cylinder will explode causing severe injury or death.
Note
• Because R410A is 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 will 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 will fail when pressurized.
R410A Refrigerant

12
Multi F Ceiling Cassette Indoor Unit
Due to our policy of continuous product innovation, some specifications may change without notification.
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MULTI F
MULTI F
Table 4: 0XOWL)0XOWL=RQH&HLOLQJ&DVVHWWH,QGRRU8QLW6SHFL¿FDWLRQV
GENERAL DATA
6SHFL¿FDWLRQV
Model Name LMCN078HV LCN098HV4 LCN128HV4 LCN188HV4
Grille (Sold Separately) PT-QCHW0 or
PT-UQC
PT-QCHW0 or
PT-UQC
PT-QCHW0 or
PT-UQC
PT-QCHW0 or
PT-UQC
Nominal Cooling Capacity (Btu/h)17,000 9,000 12,000 18,000
Nominal Heating Capacity (Btu/h)18,100 10,400 13,800 20,800
Operating Range
Cooling (°F WB) 57-77
Heating (°F DB) 59-81
Fan
Type Turbo
Motor Output (W) x Qty. 43 x 1
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate CFM (H/M/L) 265 / 212 / 177 300 / 265 / 230 335 / 283 / 247 459 / 424 / 388
Unit Data
Refrigerant Type2R410A
Refrigerant Control EEV
Power Supply V, Ø, Hz3208-230, 1, 60
Rated Amps (A) 0.25
Sound Pressure Level ±3 dB(A) (H/M/L)431 / 27 / 24 36 / 33 / 30 38 / 35 / 32 41 / 39 / 36
Body Dimensions (W x H x D, in.) 22-7/16 x 8-7/16 x 22-7/16 22-7/16 x 10-3/32 x
22-7/16
Grille (Sold separately) Dimensions (WxHxD, in.) 24-13/32 x 1-11/32 x 24-13/32
Body Net Weight (lbs.) 26 29 32
Grille (Sold separately) Net Weight (lbs.) 7
Body Shipping Weight (lbs.) 31 34 39
Grille (Sold separately) Shipping Weight (lbs.) 9
Power Wiring / Communications Cable (No. x AWG)54 x 14
Heat Exchanger (Row x Column x Fin / inch) x No. (1 x 8 x 18) x 1 (2 x 8 x 18) x 1 (2 x 10 x 18) x 1
Pipe Size
Liquid (in.) 1/4
Vapor (in.) 3/8 1/2
Connection Size
Liquid (in.) 1/4
Vapor (in.) 3/8 1/2
Drain O.D. / I.D. (in.) 1-1/4, 1
1Nominal capacity is rated 0 ft. above sea level with corresponding refrigerant piping length in accor-
dance with standard length of each outdoor 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 60ºF
wet bulb (WB) and outdoor ambient conditions of 47ºF dry bulb (DB) and 43ºF wet bulb (WB).
2This unit comes with a dry helium charge.
3Acceptable operating voltage: 187V-253V.
4Sound 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.
5All power wiring / communications cable to the IDUs be minimum 14 AWG, 4-conductor, stranded,
shielded or unshielded (if shielded, must be grounded to chassis at ODU only) and must comply with
applicable local and national codes.

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Installation Manual
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MULTI F
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GENERAL DATA
'LPHQVLRQV
Figure 2: LMCN078HV, LCN098HV4, and LCN128HV4 Dimensions.
23-5/8 (600) (Ceiling Opening)
Unit: Inch (mm])
4-17/32
(115) 2-51/64
(71)
2-51/64
(71)
4-17/32
(115) 7/64
(3)
2-3/4
(70)
5-29/32
(150)
5-29/32
(150)
20-23/64 (517) (Hanging Bolt)
10-13/64 (259)
10-13/64 (259)
10-13/64 (259)
23-5/8 (600) (Ceiling Opening)
20-23/64 (517) (Hanging Bolt)
20-19/32 (523) (Hanging Bolt)
10-13/64 (259)
5-19/32
(142)
9-19/64 (236)
7-61/64
(202)
7-61/64
(202)
Max. Condensate Lift: 31-1/2
(800) or less
22-7/16 (570)
1-31/32
(50)
18-5/32 (461) (Hanging Bolt)
1-3/16
(30)
63/64
(25)
63/64
(25)
7-13/64
(183)
1-11/32
(34)
3-21/32
(93)
6-1/16
(154)
24-13/32 (620)
14-29/32 (379) (Air Outlet Hole)
24-13/32 (620)
22-7/16 (570)
14-29/32 (379)
(Air Outlet Hole)
111
32
24-13/32 (620)
24-13/32 (620)
PT-QCHW0

14
Multi F Ceiling Cassette Indoor Unit
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Figure 3: LCN188HV4 Dimensions.
GENERAL DATA
'LPHQVLRQV
Unit: Inch (mm)
2-51/64
(71)
5-29/32
(150)
7/64
(3)
2-3/4
(70)
6-3/16
(157)
7-9/16
(192)
23-5/8 (600) (Ceiling Opening)
23-5/8 (600) (Ceiling Opening)
20-23/64 (517) (Hanging Bolt)
20-23/64 (517) (Hanging Bolt)
10-13/64 (259)
10-13/64 (259)
10-13/64 (259)
10-13/64 (259)
20-19/32 (523) (Hanging Bolt)
18-5/32 (461) (Hanging Bolt)
22-7/16 (570)
22-7/16 (570)
5-19/32
(142) 1-31/32
(50)
1-3/16
(30)
63/64
(25) 63/64
(25)
7-13/64
(183)
1-11/32
(34)
3-1/2
(89)
6-1/16
(154)
24-13/32 (620)
14-29/32 (379) (Air Outlet Hole)
24-13/32 (620)
14-29/32 (379)
(Air Outlet Hole)
Max. Condensate Lift: 31-1/2
(800) or less
7-61/64
(202)
7-61/64
(202)
11
(279)
111
32
24-13/32 (620)
24-13/32 (620)
PT-QCHW0

15
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.
MAX
MUL
TI F
MULTI F
GENERAL DATA
Figure 4: Multi F Four-Way Ceiling-Cassette Indoor Unit Refrigerant Flow Diagram.
Refrigerant Piping Diagram
Heat exchanger Gas pipe connection port
(flare connection)
Liquid pipe connection port
(flare connection)
Turbo fan
M
Cooling
Heating
Indoor Air
Temperature Thermistor
Evaporator Inlet
Temperature Thermistor
Evaporator Outlet
Temperature Thermistor
Table 5: Multi F Four-Way Ceiling-Cassette Indoor Unit Refrigerant Pipe
Sizes.
Model No. Vapor (inch) Liquid (inch)
LMCN078HV
Ø3/8 Ø1/4 LCN098HV4
LCN128HV4
LCN188HV4 Ø1/2
Table 6: Multi F Four-Way Ceiling-Cassette Indoor Unit Refrigerant Pipe
Connections.
Description (Based on Cooling Mode) PCB Connector
Indoor Air Temperature Thermistor CN-ROOM
Evaporator Inlet Temperature Thermistor CN-PIPE/IN
Evaporator Outlet Temperature Thermistor CN-PIPE/OUT
Table 7: Multi F Four-Way Ceiling-Cassette Indoor Unit Thermistor Details.
Model No. Vapor (inch) Liquid (inch)
LMCN078HV
Ø3/8 Ø1/4 LCN098HV4
LCN128HV4
LCN188HV4 Ø1/2

16
Multi F Ceiling Cassette Indoor Unit
Due to our policy of continuous product innovation, some specifications may change without notification.
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MULTI F
MULTI F
Unpack and Inspect for Freight Damage
CAUTION
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FDUU\LQJDXQLWE\KDQG
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GDPDJHWRWKHXQLWXVHDWOHDVWWZRSHRSOHZKHQFDUU\LQJDXQLWE\KDQG
• %HIRUHRSHQLQJWKHVKLSSLQJFRQWDLQHUFKHFNWKHFRQWDLQHUODEHOLQJWRYHULI\WKHXQLWUHFHLYHGLVWKHFRUUHFWXQLW9HULI\WKHXQLWFDSDFLW\
W\SHDQGYROWDJH5HIHUWRWKH³8QLW1RPHQFODWXUH´FKDUWLQWKHEHJLQQLQJRIWKLVPDQXDO
• $IWHURSHQLQJLIWKHXQLWLVGDPDJHGUHSDFNWKHXQLWDVLWZDVVKLSSHGWR\RX5(7$,1$//3$&.,1*0$7(5,$/6,QJHQHUDOIUHLJKW
GDPDJHFODLPVZLOOEHGHQLHGLIWKHRULJLQDOSDFNLQJPDWHULDOVDUHQRWUHWDLQHGIRUWKHFODLPVDGMXVWRUWRLQVSHFW&RQWDFW\RXUVXSHUYLVRURQ
KRZWRSURFHHGZLWKILOLQJDIUHLJKWFODLPDQGWRRUGHUDUHSODFHPHQWXQLW
• 7RDYRLGGDPDJLQJWKHLQGRRUXQLW GRQRWXQSDFNWKHXQLWDQGUHPRYHWKHSURWHFWLYHPDWHULDOVXQWLOLWLVUHDG\WRLQVWDOO%HIRUHXQSDFN-
LQJFDUHIXOO\PRYHWKHSDFNDJHGXQLWWRDZRUNDUHDQHDUWKHLQVWDOODWLRQORFDWLRQ
Unpack and Inspect for Freight Damage
1. Before opening the shipping container, verify the correct unit is included as described in the note above.
2. Place the box on a solid surface right side up.
3. Cut the white reinforced nylon straps.
4. Open the box and fold back all four flaps.
5. Remove any protective cardboard / Styrofoam®top sheets and place to the side.
6. The walls and top panels are not attached to the bottom of the box. Lift the cardboard carton by the flaps and remove the box walls and
top and place it to the side.
7. Remove the moisture barrier plastic bonnet.
8. Check the unit nameplate data and model number. Verify the unit voltage, and capacities are correct before proceeding.
9. Locate and retain all included parts and accessories in the box.
10. Using two people, carefully lift the unit and inspect for freight damage. DO NOT lift by the refrigerant piping or drain pipe stub. Lift by
the frame only. If damage is found, repack the unit as it was received in the original container.
INSTALLATION
Unpack and Inspect

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Installation Manual
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MAX
MULTI F
MULTI F
INSTALLATION
Indoor Unit Location Selection
Location Selection
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DANGER
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Do’s
Select a location for installing the ceiling cassette indoor unit that
meets the following conditions.
• Place in an area that is level and with enough strength to bear the
weight of the indoor unit.
• Place the unit where air circulation will not be blocked.
• Place the unit where operating sound from the unit will not disturb
occupants.
• Include enough space for service access.
• Place the indoor unit in a location where it can be easily connected
to the outdoor unit / branch distribution unit.
• Place the unit where drainage can be obtained easily and to mini-
mize the length of the condensate drain piping; include space for
drainage to ensure condensate flows properly out of the unit when it
is in cooling mode.
• Ensure there is sufficient space from the ceiling and floor.
• Place the unit in a location where electrical noise / electromagnetic
waves will not impact operation. Maintain proper distances between
the indoor units and electric wires, audio and visual appliances, breaker / circuit panels, etc.
• Use the provided pattern to determine the size of the ceiling opening and the hanging bolt locations required by the unit.
Do Not’s
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• 7KHXQLWVKRXOGQRWEHLQVWDOOHGLQDQDUHDZKHUHVXOIXULFDFLGDQG
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VWDJQDWHOHDNRUVWRUHG
• 7KHXQLWVKRXOGQRWEHLQVWDOOHGLQDORFDWLRQZKHUHDFLGLFVROXWLRQ
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• $YRLGLQVWDOOLQJWKHXQLWQHDUKLJKIUHTXHQF\JHQHUDWRUVRUQHDUDQ\
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• 'RQRWLQVWDOOWKHXQLWQHDUDGRRUZD\
7KHXQLWPXVWQRWEHLQVWDOOHGZKHUHVXOIXULFDFLGDQGÀDPPDEOHRUFRUURVLYHJDVHVDUHJHQHUDWHGYHQWHGLQWRRUVWRUHG7KHUHLVULVNRI¿UHH[SOR-
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The unit will be damaged, will malfunction, and / or will not operate as designed if installed in any of the conditions listed.
Install a ventilation fan
with sufficient capacity
Heat or steam source
Indoor Unit
Include enough
distance
Figure 6: Installing Near a Heat or Steam Source.
Ceiling
Ceiling Tile
Ceiling Tile
Floor
≥13/32
H = 6 feet to 12 feet
≥39-3/8 inches
≥19-11/16 ≥19-11/16
≤11-13/16 inches
inches
inches
inches
Figure 5: Required Clearances Around Typical Installed Unit.

18
Multi F Ceiling Cassette Indoor Unit
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Ceiling Height Mode Selection
IHHW Low Ceiling
7-1/2 feet to 8-7/8 feet Standard
8-7/8 feet to 10-3/16 feet High Ceiling
10-3/16 feet to 11-13/16 feet Very High Ceiling
Table 8: Ceiling Cassette Indoor Unit High Ceiling Mode Selection
Options.
Installing in an Area with High Humidity Levels
If the environment is prone to humidity levels of 80% or more (near the ocean, lakes,
etc.) or where steam could collect in the plenum:
• Install additional insulation to the indoor unit (glass wool insulation >13/32 inches
thick).
• Install additional insulation to the refrigerant piping (insulation >13/16 inches thick).
• Seal all gaps between the indoor unit and the ceiling tiles (make the area air tight) so
that humidity does not transfer from the plenum to the conditioned space. Also, add a
ceiling grille for ventilation.
Ventilation Grille
Figure 7: Installing in a Highly Humid Location.
Installing in a High or Dropped Ceiling
High or dropped ceilings, often found in commercial buildings and
offices, will cause a wide temperature differentiation. To countermea-
sure:
• Change the indoor unit mode selection to allow for higher ceilings
(see table).
• Install an air circulator.
• Set the air discharge outlet so that heated air flows in a downward
direction.
• Use a dual door system to protect the building gate or exit.
Figure 8: Installing Multiple Indoor Units.
Installing Multiple Indoor Units in One Area
Ensure there is enough space between indoor units, lighting fixtures,
and ventilation fans / systems.
>59-1/16 inches
Indoor unit
Lighting
Ventilator
Indoor unit
>78-25/32 inches
>118-5/32 inches
• ,QGRRUXQLWV,'8VPXVWQRWEHSODFHGLQDQHQYLURQPHQWZKHUHWKH,'8VZLOOEHH[SRVHGWRKDUPIXOYRODWLOHRUJDQLFFRPSRXQGV92&VRU
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Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas (floors, walls) in some rooms will be exposed to unconditioned air (room will be above or next to an
unheated garage or storeroom). To countermeasure:
• Verify that carpet is or will be installed (carpet will increase the temperature by three (3) degrees).
• Add insulation between the floor joists.
• Install radiant heat or another type of heating system to the floor.
INSTALLATION
Indoor Unit Location Selection

19
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.
MAX
MULTI F
MULTI FPreparing the Installation Area
INSTALLATION
23-1/16 inches ~ 26 inches (Ceiling Opening)
20-3/8 inches
18-5/32 inches
20-3/8 inches
23-1/16 inches ~ 26 inches (Ceiling Opening)
20-19/32 inches
22-15/32 inches Unit Size
22-15/32 inches
Unit Size
12-9/16 inches
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Figure 9: Cassette Indoor Unit Templates.
Level
Ceiling
Ceiling
Figure 10: Drilling Holes Using Template.
Figure 11: Ceiling Opening Dimensions and Bolt Locations.
Preparing the Installation Area
1. Cassette indoor units include installation guides (templates) that depict the exact dimensions necessary for the ceiling opening. One is
a paper template that is found in the cassette indoor unit shipping materials; the other template is the cardboard on the bottom of the
packaging.
2. Using one of the templates, choose the location for the indoor unit. Mark where the four (4) suspension / hanger bolts, refrigerant piping,
and drain hose should be. Suspension bolt angle must account for drain direction.
3. Drill holes for the four (4) suspension / hanger bolts.
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20
Multi F Ceiling Cassette Indoor Unit
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
MULTI F
MULTI F
Install the four screws
at the location marked on the
template
Installation Guide
(template)
Ceiling tile
7-3/32 inches
Ceiling tile
Ceiling
Leave 1-9/16 inches of the bolt
beneath the bracket
Open the ceiling tiles that are
along the outside edge of the
installation guide.
Indoor Unit
Leave a space of 1-3/16 inches ± 1/8 inches
between the bottom of the indoor unit and the
ceiling
Figure 12: Installing the Hanging Bolt in the Ceiling. Figure 13: Installation Diagram.
For Existing Ceilings
1. Use anchors when installing the indoor unit in an existing ceiling.
2. Ceiling height is shown on the side of the installation guide (template). Adjust the height of the unit accordingly. Adjust the clearance
before hanging the indoor unit.
3. Remove the temporary washer plate and position the indoor unit hanger brackets on the bolts. Secure with nuts and washers on the top
and bottom of the hanger brackets.
4. Ceiling-cassette indoor units are equipped with a built-in drain pump and float switch, therefore, the unit must be installed horizontally or
condensate will drip out and cause product malfunction. Measure the unit at each corner to verify that it is level.
5. Remove the installation guide (template).
For New Ceilings
1. Use a sunken insert, a sunken anchor, or any other field-supplied part to
reinforce the ceiling so that it can bear the weight of the indoor unit. Use a
temporary washer plate to more easily set up the unit suspension location.
2. Ceiling height is shown on the side of the installation guide (template). Adjust
the height of the unit accordingly. Adjust the clearance before hanging the
indoor unit.
3. Refer to the installation guide (template) for the dimensions to the ceiling
opening. Match the center of the indoor unit (labeled) to the center indicated
on the installation guide.
4. Align the installation guide (template) with the label attached to the unit (af-
fixing the template to the unit if desired) to properly place the unit.
5. Remove the temporary washer plate and position the indoor unit hanger
brackets on the bolts. Secure with nuts and washers on the top and bottom
of the hanger brackets.
6. Ceiling-cassette indoor units are equipped with a built-in drain pump and
float switch, therefore, the unit must be installed horizontally or condensate
will drip out and cause product malfunction. Measure the unit at each corner
to verify that it is level.
7. Remove the installation guide (template).
Flat washer for M10
(field supplied)
Flat washer for M10
(field supplied)
Hanging bolt
(W3/8 or M10)
Nut
(W3/8 or M10)
Nut
(W3/8 or M10)
Spring washer
(M10)
Figure 14: Hanging the Indoor Unit.
Hanging the Indoor Unit
INSTALLATION
Hanging the Indoor Unit
The following parts are field supplied:
• Hanging bolt - W-3/8” or M10
• Nut - W-3/8” or M10
• Spring washer - M10
The following parts are included with the indoor unit:
• Flat washer - M10
Anchor
Old Building New Building
Plate Washer
Spring Washer
Nut
Suspension Bolts
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