LG MULTI F LAN090HSV4 User manual

ART COOL™ MIRROR
WALL-MOUNTED
INDOOR UNIT
INSTALLATION MANUAL
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• LAN090HSV4 9 kBtu
• LAN120HSV4 12 kBtu
• LAN180HSV4 18 kBtu

The instructions included in this manual must be followed to prevent prod-
uct malfunction, property damage, injury, or death to the user or other
people. Incorrect operation due to ignoring any instructions will cause
harm or damage. A summary of safety precautions begins on page 4.
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.
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.
IM_Multi_F_ArtCoolMirrorWallMount_5_15

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Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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TABLE OF CONTENTS
CONTENTS
Safety Instructions........................................................................................................................................... 4
Introduction...................................................................................................................................................... 9
Unit Nomenclature......................................................................................................................................... 11
General Data ................................................................................................................................................. 12
Specications ............................................................................................................................................................. 13
Typical Multi F/Multi F Max Systems .......................................................................................................................... 15
Refrigerant Piping Requirements ............................................................................................................................... 17
General Installation Guidelines...................................................................................................................... 18
Location Selection ...................................................................................................................................................... 18
Inspection ................................................................................................................................................................... 19
Refrigerant Piping....................................................................................................................................................... 22
Piping Materials and Handling.................................................................................................................................... 30
Piping Preparation...................................................................................................................................................... 31
Piping Connections........................................................................................................................................ 32
IDU to ODU ................................................................................................................................................................ 32
Piping Insulation ......................................................................................................................................................... 35
Drain Piping................................................................................................................................................................ 37
Electrical Wiring............................................................................................................................................. 38
Power Wiring Specications and Best Practices........................................................................................................ 39
Power Wiring Specications and Best Practices/Controller Options 40
Indoor Unit Electrical Connections Guidelines ........................................................................................................... 41
Indoor Unit Electrical Connections Procedure............................................................................................................ 42
Self Diagnosis Functions ........................................................................................................................................... 44
LG SIMS - Self Diagnosis Functions ......................................................................................................................... 46
Optional Wall-Mounted Sensor and Controller ........................................................................................................... 48
Troubleshooting............................................................................................................................................. 49
Error Codes ............................................................................................................................................................... 49
Cautions for Refrigerant leaks....................................................................................................................... 51
Refrigerant Leaks ....................................................................................................................................................... 51
Installation Checklist...................................................................................................................................... 52

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Multi F Art Cool™ Mirror Wall-Mounted Indoor Unit
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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 below.
SAFETY INSTRUCTIONS
WARNING
Do not install, remove, or re-install the unit by yourself
(end-user). Ask the dealer or an authorized technician to
install the unit.
Improper installation by the user may result in water leakage, re,
explosion, electric shock, physical injury or death.
For replacement of an installed unit, always contact an
LG trained service provider.
There is risk of re, electric shock, explosion, and physical injury or death.
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 may
enter the unit, causing re, electric shock, and physical injury or death.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Exposure to high concentration levels of refrigerant gas may lead to
illness or death.
Do not install the unit using defective hanging, attaching,
or mounting hardware.
There is risk of physical injury or death.
Wear protective gloves when handling equipment.
Sharp edges may cause personal injury.
Dispose of 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.
Do not install the unit in any location exposed to open
ame or extreme heat. Do not touch the unit with wet hands.
There is risk of re, electric shock, explosion, and physical injury or death.
Install the unit considering the potential for earthquakes.
Improper installation may 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 is
shorted and forced to operate improperly, or parts other than those
specied by LG are used, there is risk of re, electric shock, explosion,
and physical injury or death.
If the air conditioner is installed in a small space, take mea-
sures to prevent the refrigerant concentration from exceed-
ing 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 re-
frigerant leaks and safety limits are exceeded, it could result in personal
injuries or death from oxygen depletion.
DANGER
This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING
This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
CAUTION
This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury.
Note:
This symbol Indicates situations that may result in equipment or property damage accidents only.
This symbol indicates an action that should not be performed.
TABLE OF SYMBOLS
INSTALLATION
DANGER
Don’t use or store ammable gas or combustibles near the unit.
There is risk of re, explosion, and physical injury or death.

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Installation Manual
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CAUTION
Be very careful when transporting the product.
• 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 at a minimum of four points to avoid slippage from rigging apparatus.
• Failure to follow these directions may result in minor or moderate physical injury.
SAFETY INSTRUCTIONS
INSTALLATION – CONTINUED
Note:
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated pipe can generate condensate that
may drip and cause water damage to walls.
When installing the unit in a hospital, mechanical room, or
similar electromagnetic eld (EMF) sensitive environment,
provide sufcient protection against electrical noise.
Inverter equipment, power generators, high-frequency medical equip-
ment, or radio communication equipment may cause the air conditioner to
operate improperly. The unit may 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
preserving foods, works of art, wine coolers, or other preci-
sion air conditioning applications. This equipment is de-
signed 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 may cause refrigerant leaks and system malfunction.
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 outdoor 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.
Don’t store or use ammable gas / combustibles near the
unit.
There is risk of product failure.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels may 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
system 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.
WARNING
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated pipe can generate condensate that
may drip and cause a slippery oor conditio that may lead to accidents
(like falling), causing an injury.

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Multi F Art Cool™ Mirror Wall-Mounted Indoor Unit
Due to our policy of continuous product innovation, some specifications may change without notification.
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SAFETY INSTRUCTIONS
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.
There is risk of re, electric shock, explosion, physical injury or death.
WARNING
The information contained in this manual is intended for use
by an industry-qualied, experienced, trained electrician
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.
Ensure the unit 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-
formed properly, it may result in re, electric shock, physical injury or death.
Refer to local, state, and federal codes, and use power wires
of sufcient current capacity and rating.
Wires that are too small may generate heat and cause a re.
Secure all eld wiring connections with appropriate wire
strain relief.
Improperly securing wires will create undue stress on equipment power
lugs. Inadequate connections may generate heat, cause a re and
physical injury or death.
Properly tighten all power connections.
Loose wiring may overheat at connection points, causing a re, physical
injury or death.
Note:
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.

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Installation Manual
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OPERATION
DANGER
Do not provide power to or operate the unit if it is ooded
or submerged.
There is risk of re, electric shock, physical injury or death.
Use a dedicated power source for this product.
There is risk of re, electric shock, physical injury or death.
Do not operate the disconnect switch with wet hands.
There is risk of re, electric shock, physical injury or death.
Periodically verify the hanging bolts and other hardware
securing the unit have 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
and the system develops a refrigerant leak, it may cause re, electric
shock, explosion, physical injury or death.
SAFETY INSTRUCTIONS
Note:
Clean up the site after installation is nished, and check
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) may result in severe
bearing damage to the compressor(s). Keep the power switch on during
the operational season.
Do not block the inlet or outlet.
Unit may malfunction.
Periodically verify the hanging bolts and other hardware
securing the unit have not deteriorated.
If the unit falls from its installed location, it can cause property damage
or product failure.
Securely attach the electrical cover to the indoor unit. Non-
secured covers can result in re due to dust or water in the
service panel.
Periodically verify the equipment mounts have not deterio-
rated.
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.
WARNING
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure, re, electric shock, physical injury or death.
Avoid excessive cooling and periodically perform ventilation
to the unit.
Inadequate ventilation is a health hazard.
Do not touch the refrigerant piping during or after operation.
It can cause burns or frostbite.
Do not operate the unit with the panel(s) or protective
cover(s) removed; keep ngers and clothing away from
moving parts.
The rotating, hot, cold, and high-voltage parts of the unit can 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
qualied persons in order to avoid physical injury and/or electric shock.
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
electrostatic lter, if the unit includes one. 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.
There is risk of unit failure, re, electric shock, physical injury or death.
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 with the unit is plugged in. Do not touch the
electrostatic lter, if the unit includes one.
The unit contains sharp, rotating, hot, and high voltage parts that can
cause personal injury and/or electric shock.
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.
CAUTION
To avoid physical injury, use caution when cleaning or servicing the air conditioner.

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Multi F Art Cool™ Mirror Wall-Mounted 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.
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Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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INTRODUCTION
Multi F and Multi F MAX Art Cool™
Mirror Wall-Mounted Units
This manual describes how to install the LG Multi F and Multi F MAX
(Multi Zone) Art Cool Mirror Wall-Mounted Indoor Units (IDU) for
Multi F heat pump systems. Table 1 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 instal-
lation. 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.
Applicable Codes
Personnel must be familiar with and follow the applicable national,
state, and/or local codes. In the event of a conflict between any
applicable code and the instructions in this manual, comply with the
applicable code.
• 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, at washers, and
lock/split washers
• Insulated drain hose
• Additional drain hose
• Level
• Screwdriver
• Electrical lineman pliers
• Electric drill
• Hole saw
• Flaring tool set
• Tubing cutter
• Tube/pipe reamer
• Torque wrenches
• Allen wrench
• Gas-leak detector
• Thermometer
WARNING
Installation work must be performed by trained personnel and in
accordance with national wiring standards and all local or other
applicable codes. Improper installation can result in re, electric shock,
physical injury, or death.
Note:
Please read all instructions before installing this product. Become familiar
with the unit, its components and connections, and the order of installa-
tion. Incorrect installation can degrade or prevent proper operation.
Figure 1: Typical Multi F Art Cool Mirror Wall-Mounted Indoor Unit
Required Tools (field provided)
Required Parts (field provided)

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Multi F Art Cool™ Mirror Wall-Mounted Indoor Unit
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Typical Unit Model Number Nominal Capacity
Cooling (Btu) Heating (Btu)
LAN090HSV4 9,000 10,400
LAN120HSV4 12,000 13,800
LAN180HSV4 18,000 20,800
Table 1: Multi F Art Cool Mirror Wall-Mounted Indoor Units
INTRODUCTION
Part Quantity Image
Installation Plate One (1)
Type “A” Screws Five (5)
Type “B” Screws
(M4 x 12L) Two (2)
Wireless
Controller with Holder
HSV4: AKB73835317
One (1)
Table 2: Included Items
9,000 ~ 12,000 Btu/h Indoor Units 18,000 Btu/h Indoor Units

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Installation Manual
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UNIT NOMENCLATURE
Multi F Multi-Zone Systems —Indoor Units
AN090 HSV
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
077 = 7,000
090 = 9,000
120 = 12,000
157 = 15,000
180 = 18,000
247 = 24,000
L
• Voltage for all equipment is 208-230V, 60 Hz, 1-phase.
• All indoor units are compatible with wired controllers
Type: M = Multi-Zone
A / S = Single Zone (Gen 4 Single Zone units also compatible with Multi Zone)
4
Generation or Revision
1 = First
2 = Second
3 = Third
4 = Fourth

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Multi F Art Cool™ Mirror Wall-Mounted Indoor Unit
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GENERAL DATA
R410A Refrigerant
R410A refrigerant 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.
R410A refrigerant is an azeotrope of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is 0.
WARNING
Do not place refrigerant cylinder in direct sunlight. Refrigerant cylinder may 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 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.
Indoor units Outdoor units
Model Number Indoor Unit Nominal
Capacity (Btu/h)
LMU18CHV LMU24CHV LMU30CHV LMU36CHV LMU480HV LMU540HV
Maximum No. of Connectable Indoor Units
234488
LAN090HSV4 9,000 O O O O O O
LAN120HSV4 12,000 O O O O O O
LAN180HSV4 18,000 – O O O O O
Table 3: Allowable Indoor Unit to Outdoor Unit Connections.
Allowable Indoor Unit to Outdoor Unit Connections
In Multi F/Multi Zone systems, the Art Cool Mirror wall-mounted IDUs can be connected to the Multi F outdoor units (ODUs) listed in Table 3.
connection allowed: O
connection not allowed: –
Device Connection Limitations
• The minimum number of connected and operating indoor units to Multi F / Multi F MAX systems is two.
• The maximum number of indoor units for each Multi F / Multi F MAX heat pump system is:
LMU18CHV = 2
LMU24CHV = 3
LMU30CHV = 4
LMU36CHV = 4
LMU480HV = 8
LMU540HV = 8
• The maximum allowable total indoor unit capacity (Btu/h) for each Multi F / Multi F MAX heat pump system is:
LMU18CHV = 24,000
LMU24CHV = 33,000
LMU30CHV = 40,000
LMU36CHV = 48,000
LMU480HV = 65,000
LMU540HV = 73,000
• Refer to the Multi F Engineering Manual to properly determine total indoor unit connected capacity.

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Installation Manual
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Table 4: Multi F Multi Zone Art Cool Mirror Wall-Mounted Indoor Unit Specications
GENERAL DATA
Specications
Model Name LAN090HSV4 LAN120HSV4 LAN180HSV4
Nominal Cooling Capacity (Btu/h)19,000 12,000 18,000
Nominal Heating Capacity (Btu/h)110,400 13,800 20,800
Operating Range
Cooling (°F WB) 57-77
Heating (°F DB) 59-81
Fan
Type Cross Flow
Motor Output (W) x Qty. 14.4 x 1 76.0 x 1
Motor/Drive Brushless Digitally Controlled / Direct
Airflow Rate CFM (H/M/L) 247 / 230 / 212 335 / 318 / 300 572 / 501 / 434
Unit Data
Refrigerant Type2R410A
Refrigerant Control Electronic Expansion Valve (EEV)
Power Supply V, Ø, Hz3208-230, 1, 60
Rated Amps (A) 0.2 0.3
Sound Pressure Level ±3 dB(A) (H/M/L)433 / 30 / 27 39 / 36 / 31 37 / 33 / 28
Dimensions (W x H x D, in.) 34-13/16 x 11-1/4 x 8-1/16 34-13/16 x 11-1/4 x 8-1/16 40-9/16 x 12-13/16 x 9-11/16
Net Unit Weight (lbs.) 24 32
Shipping Weight (lbs.) 29 39
Power Wiring / Communications Cable (No. x AWG)54 x 18
Heat Exchanger (Row x Column x Fin / inch) x No. (2 x 16 x 23) x 1 (3 x 18 x 22) x 1
Pipe Size
Liquid (in.) 1/4
Vapor (in.) 3/8 1/2
Connection Size
Liquid (in.) 1/4 3/8
Vapor (in.) 3/8 5/8
Drain O.D. / I.D. (in.) 27/32, 5/8
1Nominal capacity is rated 0 ft. above sea level with corresponding refrigerant piping
length in accordance 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 be minimum 18 AWG, 4-conductor, stranded,
shielded, and must comply with applicable local and national codes.

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Multi F Art Cool™ Mirror Wall-Mounted Indoor Unit
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GENERAL DATA
Gas pipe connection port
(flare connection)
Liquid pipe connection port
(flare connection)
Cooling
Heating
Thermistor for
Evaporator Inlet Temperature
Thermistor for
Indoor Air Temperature
Thermistor for Evaporator
Outlet Temperature
Heat Exchanger
Cross Flow Fan
M
Model No. Vapor (inch) Liquid (inch)
LAN090HSV4 Ø3/8 Ø1/4
LAN120HSV4
LAN180HSV4 Ø5/8 Ø3/8
Table 5: Multi F Multi Zone Art Cool Mirror Wall-Mounted Indoor Unit Refrigerant Pipe Connection Port Diameters
Figure 2: LAN090-120-180HSV4 Refrigerant Piping Diagram

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Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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GENERAL DATA
Typical Multi F/Multi F Max Systems
Max. 49.2 feet Max. 24.6 feet
A
B
C
D
Typical Multi F System
Example: LMU36CHV outdoor unit with four (4)
indoor units connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
A, B, C, D: Piping from Outdoor Unit to Indoor Unit.
Major System Components
A typical Multi F system consists of an outdoor unit (ODU), refrigerant piping, and two (2) to four (4) indoor units (IDUs). The Art Cool Mirror
wall-mounted units described in this manual are one of the types of IDUs that can be connected to a Multi F system.
A typical Multi F Max system consists of an ODU, refrigerant piping, one or two branch distribution units (BDU), and two (2) to eight (8) IDUs.
The Art Cool Mirror wall-mounted units described in this manual are one of the types of IDUs that can be connected to a Multi F Max system.
Example: LMU540HV outdoor unit with four
(4) indoor units, and one (1) branch distribu-
tion unit connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
BDU: Branch Distribution Unit.
A: Main Piping.
B: Branch Piping (Branch Distribution Unit to
Indoor Unit[s]).
A
h2 ≤ 49.2 feet
h3 ≤ 32.8 feet
h1 ≤ 98.4 feet
BDU
ODU
IDU
IDU
IDU
IDU
B
B
B
B
Typical Multi F MAX System with One Branch Distribution Unit
Outdoor
Unit
Minimum Length for Each
Pipe Segment (ft.)
Maximum Equivalent Pipe Length
to Each Indoor Unit (ft.) Maximum Equivalent Pipe Length
for Each System (ft.)
A B C D
LMU18CHV 10 82 82 - - 164
LMU24CHV 10 82 82 82 - 246.1
LMU30CHV 10 82 82 82 82 246.1
LMU36CHV 10 82 82 82 82 246.1
Table 6: Multi F Outdoor Unit Refrigerant Piping System Limitations.

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Multi F Art Cool™ Mirror Wall-Mounted Indoor Unit
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GENERAL DATA
Typical Multi F/Multi F Max Systems
Example: LMU540HV outdoor unit with seven
(7) indoor units, and two (2) branch distribu-
tion units connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
BD: Branch Distribution Unit(s).
ΣA: Main Piping.
ΣB: Branch Piping (Branch Distribution Unit[s]
to Indoor Unit[s]).
B
A
h2 ≤ 49.2 feet
A
h3 ≤ 32.8 feet
h4 ≤ 49.2 feet
h1 ≤ 98.4 feet
BDUY-Branch
BDU
IDU
A
ODU
IDU
IDU
IDU
IDU
IDU
IDU
B
B
B
B
B
B
Typical Multi F MAX System with Two Branch Distribution Units
Table 7: Multi F MAX LMU480HV and LMU540HV Outdoor Unit Refrigerant Piping System
Limitations.
Pipe Length
(ELF = Equivalent
Length of pipe
in Feet)
Total piping length (ΣA + ΣB) ≤475.7 feet
Main pipe
(Outdoor Unit to Branch
Distribution Units: ΣA)
Minimum 10 feet
Maximum ≤180.4 feet
Total branch piping length (ΣB) ≤295.3 feet
Branch pipe
(Branch Distribution Units
to Indoor Units: B)
Minimum 10 feet
Maximum ≤49.2 feet
Elevation Differential
(All Elevation
Limitations are
Measured in
Actual Feet)
If outdoor unit is above or below indoor unit (h1) ≤98.4 feet
Between the farthest two indoor units (h2) ≤42.9 feet
Between branch distribution unit and farthest
connected indoor unit(s) (h3) ≤32.8 feet
Between branch distribution units (h4) ≤42.9 feet
Table 8: Multi F MAX Piping Sizes.
Model Piping Main Pipe A
(inch) Branch Pipe B
LMU480HV Liquid Ø3/8 Depends on the size
of the indoor unit piping
Gas Ø3/4
LMU540HV Liquid Ø3/8 Depends on the size
of the indoor unit piping
Gas Ø3/4

17
Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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Table 9: Equivalent Piping Length for Elbows,
Y-branches, and Branch Distribution Units.
1Kit contains two Y-branches: one for liquid and one for vapor.
Component Size (Inches)
1/4 3/8 1/2 5/8 3/4
Elbow (ft.) 0.5 0.6 0.7 0.8 1.2
Y-Branch Kit (ft.)
(Multi F MAX systems only)11.6
Branch Distribution Unit (ft.)
(Multi F MAX systems only) 8.2
Field-supplied elbows are allowed if they are long radius and designed for use with R410A refrigerant. Be sure to account for the additional
pressure losses in equivalent pipe length calculations for each elbow, Y-branch, and branch distribution unit. The equivalent pipe length of
each elbow, Y-branch, and/or branch distribution unit must be added to each pipe segment to ensure maximum lengths are not exceeded.
Using Refrigerant Components
Field Supplied Refrigerant Piping
Type ACR copper is the only approved refrigerant pipe material for use with LG Multi F air conditioning products. ACR rated tubing is the only
type that ships with yellow caps. Approved tubing for use with Multi F products will be marked “R410 RATED” along the length of the tube.
Tube wall thickness should meet local code requirements and be approved for a maximum operating pressure of 551 psi.
Refer to the refrigerant piping section (starting on page 22) of the General Installation Guidelines for more information on piping.
GENERAL DATA
Refrigerant Piping Requirements

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Multi F Art Cool™ Mirror Wall-Mounted Indoor Unit
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DANGER
To avoid the possibility of re, do not install the unit in an area where combustible gas may generate, ow, stagnate, or leak. Installing the unit in
an area containing combustible gas will cause serious bodily injury or death. Before beginning installation, read the safety summary at the beginning
of this manual.
Select a location for installing the Art Cool Mirror wall-mounted indoor unit (IDU) that meets the following conditions:
• Where there is enough structural strength to bear the weight of the unit.
• Where air circulation will not be blocked.
• Where noise prevention is taken into consideration.
• Ensure there is sufcient space from the ceiling and oor.
• Locate the indoor unit in a location where it can be easily connected to the outdoor unit / branch distribution unit.
• Include space for drainage to ensure condensate ows properly out of the unit when it is in cooling mode.
• Use a level indicator to ensure the unit is installed on a level plane.
Note:
The unit may be damaged, may malfunction, and / or will not operate as designed if installed in any of the following conditions:
Do not install the unit where it will be subjected to direct thermal radiation from other heat sources.
Do not install the unit in an area where combustible gas may generate, flow, stagnate, or leak.
Do not install the unit in a location where acidic solution and spray (sulfur) are often used.
Do not use the unit in environments where oil, steam, or sulfuric gas are present.
Do not install additional ventilation products on the chassis of the unit.
Do not install the unit near high-frequency generator sources.
Do not install the unit near a doorway.
Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas (floors, walls) in some rooms may be exposed to unconditioned air (room may be above or next to an
unheated garage or storeroom). To countermeasure:
• Verify that carpet is or will be installed (carpet may increase the temperature by three degrees).
• Add insulation between the oor joists.
• Install radiant heat or another type of heating system to the oor.
Required Clearances
Figure 6 shows required clearance distances around a typical installed wall-mounted unit.
GENERAL INSTALLATION GUIDELINES
Location Selection
Figure 2: Required Clearances Around Typical Installed Unit
9/12/18k Indoor Units: ≥5
More than 4
More than 4
At least 6.5 from the floor
Unit: Inch

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.
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GENERAL INSTALLATION GUIDELINES
Unpack and Inspect for Freight Damage
CAUTION
Shipping and net weights of the wall-mounted units are listed in Table 4. To help avoid injury to personnel and damage to the unit, use two people
when carrying a unit by hand.
Do not unpack the unit and remove the protective materials until ready to install. Before unpacking, carefully move the packaged unit to
a work area near the installation location.
After opening, if the unit is damaged, repack the unit as it was shipped to you. RETAIN ALL PACKING MATERIALS. In general, freight dam-
age claims will be denied if the original packing materials are not retained for the claims adjustor to inspect. Contact your supervisor on how
to proceed with filing a freight claim and to order a replacement unit.
Note:
Before opening the shipping container, check the container labeling to verify the unit received is the correct unit. Verify the unit capacity, type, and
voltage. Refer to the chart on “Dimensions of the Flare” on page 31.
1. Before opening the shipping container, verify you have the correct unit 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 top of the box and fold back all four flaps.
5. Remove the protective cardboard / Styrofoam®top sheet 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 the piping/condensate accessory kit located in the bottom of the box under the refrigerant pipe stubs.
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 hangar brackets or chassis frame only. If damage is found, repack the unit as it was received in the original container.
11.If the unit is undamaged, remove and retain the installation manual. It is located under or on top of the unit.
Inspection
Note:

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Multi F Art Cool™ Mirror Wall-Mounted 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.
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GENERAL INSTALLATION GUIDELINES
WARNING
• Mounting hardware must be securely installed to prevent the chas-
sis falling from its installation location. There is risk of personnel
injury or property damage from falling equipment.
• When choosing a location for the wall mount plate, be sure to take
into consideration routing of wiring for power outlets within the wall.
Touching wiring can cause serious bodily injury or death.
• Installation work must be performed by trained personnel and in
accordance with all local or other applicable codes. There is risk of
injury to personnel from incorrect installation.
Note:
• Ensure the unit is properly installed. Incorrectly installed units can
result in degraded performance or an inoperative unit / system.
• Use a level indicator to ensure the installation plate and chassis
are installed on a level plane.
• If the unit is installed near a body of water, certain components
are at risk of being corroded. Appropriate anti-corrosion methods
should be taken for the unit and all components.
Install Wall-Mounted IDU Chassis
Mounting the Installation Plate
The mounting wall should be strong and solid enough to protect the
unit from vibration. It should securely hold the installation plate and
the weight of the chassis.
1. Determine the installation location.
2. Refer to Figure 3 or Figure 4 for the appropriate mounting
diagram.
3. Mount the installation plate on the wall using the Type “A” screws.
If mounting the unit on concrete, consider using anchor bolts.
Use a level to ensure the plate is level.
4. Always mount the installation plate horizontally. Measure the wall
and mark the centerline using thread and a level.
Figure 3: Installation Plate for LAN090HSV4,
LAN120HSV4 Units.
Figure 4: Installation Plate for LAN180HSV4 Units.
Figure 5: Installation Plates Attaching Screw Placement.
Ø2-9/16
5-3/16
3-11/16
Right rear piping
Left rear piping
Installation Plate
Place a level on raised tab
Unit Outline
8-1/2
6-15/16
Unit: Inch
17-7/16 17-7/16
Ø2-9/16
Unit : Inch
Ø2-9/16
(65)
Right rear piping
Left rear piping
Measuring Tape
Measuring Tape
Hanger
Place a level on raised tab
Unit Outline
18-1/8 22-7/16
8-1/8
4-1/8 2-11/16
2-3/16
Ø2-9/16 Installation Plate
Installation Plate
Chassis
Hook
Type "A" Screws
Installation Plate
Chassis
Hook
Type "A" Screws
Installation Plate Screws - LAN090HSV4, LAN120HSV4 Installation Plate Screws - LAN180HSV4