ENGLISH

FRANÇAIS
ESPAÑOL
INSTALLATION MANUAL

AIR
CONDITIONER

Please read this installation manual completely before installing the product.
Installation work must be performed in accordance with the national wiring
standards by authorized personnel only.
Please retain this installation manual for future reference after reading it
thoroughly.

Ceilling Concealed Duct

www.lghvac.com
www.lg.com
P/NO : MFL65003103
Rev.01_012424 Copyright © 2015 - 2024 LG Electronics Inc. All Rights Reserved.
IMPORTANT!
Please read this instruction sheet completely before installing the product.
This air conditioning system meets strict safety and operating standards. As the installer or service person,
it is an important part of your job to install or service the system so it operates safely and efficiently.

WARNING
• Installation or repairs made by unqualified persons can result in hazards to you and others.
Installation of all field wiring and components MUST conform with local building codes or, in the absence of local
codes, with the National Electrical Code 70 and the National Building Construction and Safety Code or Canadian
Electrical code and National Building Code of Canada.
• The information contained in the manual is intended for use by a qualified service technician familiar with safety
procedures and 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 and/or death.
CAUTION: Improper installation, adjustment, alteration, service or maintenance can void the warranty.
The weight of the condensing unit requires caution and proper handling procedures when lifting
or moving to avoid personal injury. Use care to avoid contact with sharp or pointed edges.
Safety Precautions
• Always wear safety eye wear and work gloves when installing equipment.
• Never assume electrical power is disconnected. Check with meter and equipment.
• Keep hands out of fan areas when power is connected to equipment.
• R-410A causes frostbite burns.
• R-410A is toxic when burned.
NOTE TO INSTALLING DEALER: The Owners Instructions and Warranty are to be given to the owner
or prominently displayed near the indoor Furnace/Air Handler Unit.
WARNING
When wiring:
Electrical shock can cause severe personal injury or death. Only a qualified,
experienced electrician should attempt to wire this system.
• Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked.
• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death.
• Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.
• The choice of materials and installations must comply with the applicable local/national or international standards.
When transporting:
Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and
bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on
the air conditioner can cut your finger.
When installing...
... in a wall: Make sure the wall is strong enough to hold the unit's weight.
It may be necessary to construct a strong wood or metal frame to provide added support.
... in a room: Properly insulate any tubing run inside a room to prevent "sweating" that can cause
dripping and water damage to wall and floors.
... in moist or uneven locatinons: Use a raised concrete pad or concrete blocks provide a solid,
level foundation for the outdoor unit. This prevents water damage and abnormal vibration.
... in an area with high winds: Securely anchor the outdoor unit down with bolts and a metal
frame. Provide a suitable air baffle.
... in a snowy area(for Heat Pump Model): Install the outdoor unit on a raised platform that is
higher than drifting snow. Provide snow vents.
When connecting refrigerant tubing
• Keep all tubing runs as short as possible.
• Use the flare method for connecting tubing.
• Check carefully for leaks before starting the test run.
When servicing
• Turn the power OFF at the main power box(mains) before opening the unit to check or repair
electrical parts and wiring.
• Keep your fingers and clothing away from any moving parts.
• Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have
been left inside the unit being serviced.

2 Indoor Unit
 Table of contents

TABLE OF CONTENTS

ENGLISH
4 SAFETY PRECAUTIONS
7 INTRODUCTION
7 Symbols Used in this Manual
7 Features

8 INSTALLATION
8 Selection of the best location
9 Ceiling dimension and hanging bolt location
11 Indoor Unit Installation
11 Wiring Connection
12 Checking the Drainage
14 Plumbing materials and storage methods
18 Drain Piping
19 Dip Switch Setting
20 Group Control Setting
24 E.S.P Table

Installation Manual 3
Safety Precautions

Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must be
followed.
n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.

WARNING This symbol indicates the possibility of death or serious injury.

CAUTION This symbol indicates the possibility of injury or damage to properties only.

n Meanings of symbols used in this manual are as shown below.

Be sure not to do.

Be sure to follow the instruction.

WARNING
Installation
• Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.
- There is risk of fire or electric shock.
• For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized Service Center.
- Do not disassemble or repair the product. There is risk of fire or electric shock.
• Always ground the product.
- There is risk of fire or electric shock.
• Install the panel and the cover of control box securely.
- There is risk of fire or electric shock.
• Always install a dedicated circuit and breaker.
- Improper wiring or installation may cause fire or electric shock.
• Use the correctly rated breaker or fuse.
- There is risk of fire or electric shock.
• Do not modify or extend the power cable.
- There is risk of fire or electric shock.
• Do not install, remove, or re-install the unit by yourself (customer).
- There is risk of fire, electric shock, explosion, or injury.
• Be cautious when unpacking and installing the product.
- Sharp edges could cause injury. Be especially careful of the case edges and the fins on the
condenser and evaporator.
• For installation, always contact the dealer or an Authorized Service Center.
- There is risk of fire, electric shock, explosion, or injury.
• Do not install the product on a defective installation stand.
- It may cause injury, accident, or damage to the product.
• Be sure the installation area does not deteriorate with age.
- If the base collapses, the air conditioner could fall with it, causing property damage, product failure,
and personal injury.
• Do not turn on the breaker or power under condition that front panel, cabinet, top cover, control box
cover are removed or opened.
- Otherwise, it may cause fire, electric shock, explosion or death.

4 Indoor Unit
 Safety Precautions

ENGLISH
• Use a vacuum pump or Inert (nitrogen) gas when doing leakage test or air purge. Do not compress
air or Oxygen and Do not use Flammable gases. Otherwise, it may cause fire or explosion.
- There is the risk of death, injury, fire or explosion.

Operation
• Do not let the air conditioner run for a long time when the humidity is very high and a door or a
window is left open.
- Moisture may condense and wet or damage furniture.
• Take care to ensure that power cable could not be pulled out or damaged during operation.
- There is risk of fire or electric shock.
• Do not place anything on the power cable.
- There is risk of fire or electric shock.
• Do not plug or unplug the power supply plug during operation.
- There is risk of fire or electric shock.
• Do not touch(operate) the product with wet hands.
- There is risk of fire or electrical shock.
• Do not place a heater or other appliances near the power cable.
- There is risk of fire and electric shock.
• Do not allow water to run into electric parts.
- It may cause There is risk of fire, failure of the product, or electric shock.
• Do not store or use flammable gas or combustibles near the product.
- There is risk of fire or failure of product.
• Do not use the product in a tightly closed space for a long time.
- Oxygen deficiency could occur.
• When flammable gas leaks, turn off the gas and open a window for ventilation before turn the
product on.
- Do not use the telephone or turn switches on or off. There is risk of explosion or fire.
• If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the
power supply cable.
- There is risk of electric shock or fire.
• Stop operation and close the window in storm or hurricane. If possible, remove the product from the
window before the hurricane arrives.
- There is risk of property damage, failure of product, or electric shock.
• Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the
unit is so equipped.)
- There is risk of physical injury, electric shock, or product failure.
• When the product is soaked (flooded or submerged), contact an Authorized Service Center.
- There is risk of fire or electric shock.
• Be cautious that water could not enter the product.
- There is risk of fire, electric shock, or product damage.
• Ventilate the product from time to time when operating it together with a stove, etc.
- There is risk of fire or electric shock.
• Turn the main power off when cleaning or maintaining the product.
- There is risk of electric shock.
• When the product is not be used for a long time, disconnect the power supply plug or turn off the
breaker.
- There is risk of product damage or failure, or unintended operation.
• Take care to ensure that nobody could step on or fall onto the outdoor unit.
- This could result in personal injury and product damage.

Installation Manual 5
Safety Precautions

CAUTION
Installation
• Always check for gas (refrigerant) leakage after installation or repair of product.
- Low refrigerant levels may cause failure of product.
• Install the drain hose to ensure that water is drained away properly.
- A bad connection may cause water leakage.
• Keep level even when installing the product.
- To avoid vibration or water leakage.
• Do not install the product where the noise or hot air from the outdoor unit could damage the
neighborhoods.
- It may cause a problem for your neighbors.
• Use two or more people to lift and transport the product.
- Avoid personal injury.
• Do not install the product where it will be exposed to sea wind (salt spray) directly.
- It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator
fins, could cause product malfunction or inefficient operation.
• Do not install the unit in potentially explosive atmospheres.

Operation
• Do not expose the skin directly to cool air for long periods of time. (Don't sit in the draft.)
- This could harm to your health.
• Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a
consumer air conditioner, not a precision refrigeration system.
- There is risk of damage or loss of property.
• Do not block the inlet or outlet of air flow.
- It may cause product failure.
• Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
- There is risk of fire, electric shock, or damage to the plastic parts of the product.
• Do not touch the metal parts of the product when removing the air filter. They are very sharp!
- There is risk of personal injury.
• Do not step on or put anyting on the product. (outdoor units)
- There is risk of personal injury and failure of product.
• Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
- A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.
• Do not insert hands or other objects through the air inlet or outlet while the product is operated.
- There are sharp and moving parts that could cause personal injury.
• Do not drink the water drained from the product.
- It is not sanitary and could cause serious health issues.
• Use a firm stool or ladder when cleaning or maintaining the product.
- Be careful and avoid personal injury.
• Replace the all batteries in the remote control with new ones of the same type. Do not mix old and
new batteries or different types of batteries.
- There is risk of fire or explosion.
• Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
- They may burn or explode.
• If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do not
use the remote if the batteries have leaked.
- The chemicals in batteries could cause burns or other health hazards.
• If you eat the liquid from the batteries, brush your teeth and see doctor. Do not use the remote if the
batteries have leaked.
- The chemicals in batteries could cause burns or other health hazards.

6 Indoor Unit
 Introduction

ENGLISH
Introduction
Symbols Used in this Manual
This symbol alerts you to the risk of electric shock.

This symbol alerts you to hazards that could cause harm to the air conditioner.

NOTICE This symbol indicates special notes.

Features
Low static Duct type

Air outlet vents

Air filters
Air intake vents

Control box

High static Duct type

Air outlet vents

Air filters
Air intake vents

Washer for Clamp Insulation for

Name Drain hose Clamp metal (Other)
hanging backet (Tie Wrap) fitting

Quantity 1 EA 2 EA 8 EA 4 EA 1 SET

• Owner's manual
• Installation manual

Shape for gas pipe

for liquid pipe

Installation Manual 7
Installation

Installation
Read completely, then follow step by step.

Selection of the best location

Install the air conditioner in the location that satisfies the following conditions.
• The place shall easily bear a load exceeding four times the indoor unit’s weight.
• The place shall be able to inspect the unit as the figure.
• The place where the unit shall be leveled.
• The place shall allow easy water drainage.
(Suitable dimension “H” is necessary to get a slope to drain as figure.)
• The place shall easily connect with the outdoor unit.
• The place where the unit is not a ffected by an electrical noise.
• The place where air circulation in the room will be good .
• There should not be any heat source or steam near the unit.

Top view (Unit: mm) Inspection hole Control box

(600 x 600) Top view Inspection hole
[600(23-5/8) x 600(23-5/8)]
Control box

600 Air outlet

600

(39-3/8)
600 600

1,000
(23-5/8) (23-5/8)
Side view (unit: mm) Front
Front view

Air outlet

H=20 or more
20(25/32) or more
• Suitable dimension "H" is necessary to get a slope Unit:mm(inch)
to drain as shown in the figure

Low static Duct type

CAUTION : In case that the unit is
installed near the sea, the installation
parts may be corroded by salt, The
B(Min) installation parts (and the unit) should
A(Min)
be taken appropriate anti-corrosion
measures.

Ceiling Unit:mm(inch)
Service Space Capacity(kBtu/h) A B
L1 800 800(31-1/2)
A
L2 800 1,000(39-3/8)
L3 800 1,200(47-1/4)
B

8 Indoor Unit
 Installation

ENGLISH
Ceiling dimension and hanging bolt location
n Installation of Unit
Install the unit above the ceiling correctly.

CASE 1
POSITION OF SUSPENSION BOLT

• Apply a joint-canvas between the unit and duct to absorb unnecessary vibration.
• Apply a filter Accessory at air return hole.

L1, L2, L3 Series BH/BG/BR Chassis B8 Chassis

A
E
G
B A
B K L
F J
D C

C
E
EC
J

D
A
B (G)

F
GD
F
I

H H
H I

Drainage hole
Drainage hole

[Unit:mm(inch)]
Chassis
A B C D E F G H I J K L
Dimension
932 882 355 47 450 30 87 750 158
BH - - -
(36-9/13) (34-21/29) (13-5/8) (1-3/4) (17-23/32) (1-3/16) (3-5/8) (295-8/29) (62-9/44)
1,232 1,182 355 47 450 30 87 830 186
BG - - -
(48-7/13) (46-7/13) (13-5/8) (1-3/4) (17-23/32) (1-3/16) (3-5/8) (32-11/16) (7-5/16)
1,282 1,230 477 56 590 30 120 1,006 294
BR - - -
(50-15/32) (48-7/16) (18-13/16) (2-3/13) (23-7/32) (1-3/16) (4-9/13) (39-19/32) (11-9/16)
1,622 1,565 580 292 695 1,400 460 1,122 1,680 390 445 15
B8
(63-27/32) (61-5/8) (22-27/32) (11-1/2) (27-3/8) (55-1/8) (18-1/8) (44-3/16) (66-5/32) (15-3/8) (17-7/13) (5/8)
733 772 628 700 36 190 20 660 155 700
L1 - -
(28-27/32) (30-13/32) (24-23/32) (27-9/16) (1-13/32) (7-15/32) (25/32) (25-31/32) (6-3/32) (27-9/16)
933 972 628 700 36 190 20 860 155 900
L2 - -
(36-23/32) (38-9/32) (24-23/32) (27-9/16) (1-13/32) (7-15/32) (25/32) (33-27/32) (6-3/32) (35-7/16)
1133 1172 628 700 36 190 20 1060 155 1100
L3 - -
(4-7/16) (46-5/32) (24-23/32) (27-9/16) (1-13/32) (7-15/32) (25/32) (41-23/32) (6-3/32) (43-5/16)

Installation Manual 9
Installation

CASE 2
• Install the unit leaning to a drainage hole side as a figure for easy water drainage.

POSITION OF CONSOLE BOLT

• A place where the unit will be leveled and that can support the weight of the unit.
• A place where the unit can withstand its vibration.
• A place where service can be easily performed.

M10 Nut X4
M10 Nut X4 (Local
M10 SP. washer X 4 supply)
M10 washer X4 M10 washer X4

M10 washer X4
M10 washer X4
(Local
M10 SP. washer X 4 supply)
M10 Nut X8
M10 Nut X4

NOTICE
• Throughly study the following installation locations:
1. In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the fan, the fin of the
heat exchanger, resulting in heat exchange reduction, spraying, dispersing of water drops, etc.
In these cases, take the following actions:
• Make sure that the ventilation fan for smoke-collecting hood on a cooking table has sufficient capacity so that it draws
oily steam which should not flow into the suction of the air conditioner.
• Make enough distance from a cooking room to install the air conditioner in such a place where it may not suck in oil
steam.
2. Avoid installing air conditioner in such circumstances where cutting oil mist or iron powder is in suspension in factories,
etc.
3. Avoid places where inflammable gas is generated, flows in, is stored or vented.
4. Avoid places where sulfurous acid gas or corrosive gas is generated.
5. Avoid places near high frequency generators.

10 Indoor Unit
 Installation

ENGLISH
Indoor Unit Installation
• Select and mark the position for fixing bolts. • Insert the set anchor and washer onto the
• Drill the hole for set anchor on the face of ceiling. suspension bolts for locking the suspension bolts
on the ceiling.
• Mount the suspension bolts to the set anchor firmly.
• Secure the installation plates onto the suspension
bolts (adjust level roughly) using nuts, washers
and spring washers.

Old building New building

1 Set anchor
2 Plate washer
3 Spring washer
4 Nut
CAUTION : Tighten the nut and bolt 5 Suspension
to prevent unit falling. bolts

Wiring Connection
Connect the wires to the terminals on the control board individually according to the outdoor unit connection.
• Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of indoor unit respectively.

L1, L2, L3 Series

Terminal Block Indoor Terminal Block Indoor Outdoor unit Indoor unit Central controller
Outdoor unit
L(L1) N(L2) 3(A) 4(B) SODU SODU IDU IDU INTERNET DRY1 DRY2 GND 12V
GN/YL

INDOOR POWER INPUT

BH/BG/BR/B8 Series
Indoor Unit Outdoor Unit
Terminal Block Indoor Terminal Block Indoor SODU IDU INTERNET DRY1 DRY2 GND 12V
L(L1) N(L2) YL RD BK A B B A - - B A - - - -
GN/YL

Wired Remote
Controller
Indoor Power Input

WARNING : Make sure that the screws of the terminal are free from looseness.

Clamping of cables
1) Arrange 2 power cables on the control panel.
2) First, fasten the steel clamp with a screw to the inner boss of control panel.
3) For the cooling model, fix the other side of the clamp with a screw strongly. For the heat pump model, put the
AWG18 cable(thinner cable) on the clamp and tighten it with a plastic clamp to the other boss of the control panel.

Installation Manual 11
Installation
Connection method of the connecting cable(Example)
L1, L2, L3 Series

L(L1) N(L2)
3(A) 4(B)

GN/YL
Conduit Hole

Power Supply Transmission

High Voltage
(208/230V)

BH/BG/BR/B8 Series

L(L1) N(L2)
YL RD BK A B
Conduit Hole
GN/YL

Power Supply Wired Remote Transmission

High Voltage Controller
(208/230V)

WARNING : Loose wiring may cause the terminal to overheat or result in unit
malfunction. A fire hazzard may also exist.
Therefore, be sure all wiring is tightly connected.

Checking the Drainage

1. Remove the Air Filter.
Low static Duct type High static Duct type

2. Check the drainage.

• Spray one or two glasses of water upon the evaporator.
• Ensure that water flows drain hose of indoor unit without any leakage.

Low static Duct type High static Duct type

12 Indoor Unit
 Installation

ENGLISH
CAUTION :

The connecting cable connected to the indoor and outdoor unit should be complied with the
following specifications (This equipment shall be provided with a cord set complying with the
national regulation).
10±3mm

mm
±5
35

GN
/YL

20
mm
AWG18
If the supply cord is damaged, it must be replaced by a special cord or assembly available from
the manufacturer of its service agent.

u Precautions when laying power and ground wiring

Use round pressure terminals for connections to the power terminal block.
When laying ground wiring, you must use round pressure terminals.
Power wire(Ground wire)
Round pressure terminal

When none are available, follow the instructions below.

• Do not connect wiring of different thicknesses to the power terminal block. (Slack in the power wiring
may cause abnormal heat.)
• When connecting wiring which is the same thickness, do as shown in the figure below.

• For wiring, use the designated power wire and connect firmly, then secure to prevent outside pressure
being exerted on the terminal block.
• Use an appropriate screwdriver for tightening the terinal screws. A screwdriver with a small head will
strip the head and make proper tighterning impossible.
• Over-tightening the terminal screws may break them.

Installation Manual 13
Installation

Plumbing materials and storage methods

Pipe must be able to obtain the specified thickness and should be used with low
impurities.
Also when handling storage, pipe must be careful to prevent a fracture, deformity
and wound.
Should not be mixed with contaminations such as dust, moisture.

Refrigerant piping on three principles

Drying Cleanliness Airtight

Should be no moisture There is no refrigerant
No dust inside.
inside leakage

Moisture Dust Leakage

Items

- Significant hydrolysis of refrigerant oil

- Degradation of refrigerant oil - Gas shortages
- Degradation of refrigerant oil
- Poor insulation of the compressor - Degradation of refrigerant oil
Cause failure - Poor insulation of the compressor
- Do not cold and warm - Poor insulation of the compressor
- Do not cold and warm
- Clogging of EEV, Capillary - Do not cold and warm
- Clogging of EEV, Capillary
- No moisture in the pipe
- No dust in the pipe.
- Until the connection is completed,
- Until the connection is completed,
the plumbing pipe entrance should
the plumbing pipe entrance should
be strictly controlled. - Airtightness test should be.
be strictly controlled.
- Stop plumbing at rainy day. - Brazing operations to comply with
- Pipe entrance should be taken
Countermeas - Pipe entrance should be taken standards.
side or bottom.
ure side or bottom. - Flare to comply with standards.
- When removal burr after cutting
- When removal burr after cutting - Flange connections to comply with
pipe, pipe entrance should be
pipe, pipe entrance should be standards.
taken down.
taken down.
- Pipe entrance should be fitted cap
- Pipe entrance should be fitted cap
when pass through the walls.
when pass through the walls.

14 Indoor Unit
 Installation
Nitrogen substitution method

ENGLISH
Welding, as when heating without nitrogen substitution a large amount of the oxide film is formed on the internal piping.
The oxide film is a caused by clogging EEV, Capillary, oil hole of accumulator and suction hole of oil pump in compressor.
It prevents normal operation of the compressor.
In order to avoid this problem, Welding should be done after replacing air by nitrogen gas.
When welding plumbing pipe, the work is required.

◆How to work
Regulator

Welding Point
Nitrogen gas
Pressure 0.02MPa less

Oxide scale

Nitrogen
Note) should not block the outlet side.
When the internal pressure in pipe is above the Taping Auxiliary valve
atmospheric pressure, pinhole is occurred and it (Should not
is a leakage cause. contain air)

CAUTION:
1. Always use the nitrogen.(not use oxygen, carbon dioxide, and a Chevron gas):
Please use the following nitrogen pressure 0.02MPa
Oxygen --------- Promotes oxidative degradation of refrigerant oil.
Because it is flammable, it is strictly prohibited to use
Carbon dioxide --- Degrade the drying characteristics of gas
Chevron Gas ---- Toxic gas occurs when exposed to direct flame.
2. Always use a pressure reducing valve.
3. Please do not use commercially available antioxidant.
The residual material seems to be the oxide scale is observed.
In fact, due to the organic acids generated by oxidation of the alcohol contained in the anti-oxidants, ants nest corrosion
occurs. (causes of organic acid → alcohol + copper + water + temperature)

Installation Manual 15
Installation

INSULATION, OTHERS Insulate the joint and tubes completely.

THERMAL INSULATION All thermal insulation must comply with local requirement.

INDOOR UNIT

Union for liquid pipe Thermal insulator for refrigerant pipe

(Local supply) Thermal insulator for
Refrigerant pipe and thermal
piping(Local supply)
insulator(Local supply)

Hose crip for thermal insulator

(Local supply)
Overlap with thermal
Thermal insulator for refrigerant pipe insulator for piping.
(Local supply) Hose crip for thermal insulator(Local supply)
Union for gas pipe Make sure that there is no clearance here.

INSULATION, OTHERS Insulate the joint and tubes completely.

THERMAL INSULATION All thermal insulation must comply with local requirement.

INDOOR UNIT
Union for gas pipe
Thermal insulator for refrigerant pipe
(Local supply) Thermal insulator for
Refrigerant pipe and thermal
insulator(Local supply) piping(Local supply)

Hose clip for thermal insulator

(Local supply)
Thermal insulator for refrigerant pipe Overlap with thermal
(Local supply) insulator for piping.
Union for liquid pipe Hose clip for thermal insulator(Local supply)
Make sure that there is no clearance here.

Felt Cabinet

Insulation

No clearance

TEST AND CHECK

n After all workings are finished, check the working and operation.
• Air distribution ............... Is the air circulation good?
• Drain ............................. Is the drainage smoothly and no sweating?
• Gas leakage ................. Is the piping connection correctly?
• Wiring ........................... Is the wiring connection correctly?
• Lock-bolt ....................... Is the lock-bolt of compressor loosened?
• Insulation....................... Is the unit fully insulated?
• Ground .......................... Is the unit safely grounded?

16 Indoor Unit
 Installation

ENGLISH
CAUTION

1. Install declination of the indoor unit is very important for the drain of the duct type air conditioner.
2. Minimum thickness of the insulation for the connecting pipe shall be 19mm.

Front of view

• The unit must be horizontal or declined to the drain hose connected when finished installation.

Ceiling

Drainage hole
Drain Pump use

Ceiling
(1/128~3/128 inch)
1~3mm

Drain Pump Drain Pump

unuse Drainage hole use Drainage hole

CAUTION FOR GRADIENT OF Lay the drain hose with a downware

UNIT AND DRAIN PIPING inclination so water will drain out.
Thermal insulator
• Alway lay the drain with downward inclination (Local supply)
(1/50 to 1/100).
Drainage pipe
Prevent any upward flow or reverse flow in any
(Local supply)
part. Unit
• 5mm(5/24 inch) or thicker formed thermal
insulator shall always be provided for the drain
pipe.
Make sure to be closed. Drainage hole

• Upward routing not

allowed

INCORRECT
Applied U-Trap Dimension
A ≥ 70mm
(2-9/16 inch)
CORRECT B ≥ 2C
C ≥ 2 x SP
• Install the P-Trap (or U-Trap) to prevent SP = External Pressure B
a water leakage caused by the blocking (mmAq) C
of intake air filter. Ex) External Pressure U-Trap
= 10mmAq A
A ≥ 70mm(2-9/16 inch)
B ≥ 40mm(1-7/12 inch)
C ≥ 20mm(19/24 inch)

Installation Manual 17
Installation

Drain Piping
• Drain piping must have down-slope (1/50 to 1/100): be sure
Upward
not to provide up-and-down slope to prevent reversal flow. Pipe clamp
routing
• During drain piping connection, be careful not to exert not allowed
Indoor unit
extra force on the drain port on the indoor unit.
• The outside diameter of the drain connection on the indoor
unit is 32mm(1-1/4 inch).
Piping material: Polyvinyl chloride pipe inner diometes
Ø 25mm(1 inch) and pipe fittings Maintenance
drain port
• Be sure to install heat insulation on the drain piping.

Heat insulation material: Polyethylene foam with 1/50~1/100

thickness more than 8mm(5/16 inch).
MAX 700mm
(27-9/16 inch)

Drain test
The air conditioner uses a drain pump to drain water.
Use the following procedure to test the drain pump operation:

Feed water Flexible drain hose • Connect the main drain pipe to the exterior and leave
it provisionally until the test comes to an end.
Main • Feed water to the flexible drain hose and check the
drain pipe piping for leakage.
• Be sure to check the drain pump for normal operating
Drain and noise when electrical wiring is complete.
Drain Pump port Glue the joint • When the test is complete, connect the flexible drain
Drain hose connection hose to the drain port on the indoor unit.
Drain pan Use the clip

CAUTION : The supplied flexible drain Flexible drain hose

hose should not be curved, neither 1/50~1/100
screwed. The curved or screwed hose
MAX 700mm
may cause a leakage of water. (27-9/16 inch)

CAUTION: Flexible drain hose

After the confirmation of the above conditions, prepare the wiring as follows: Flexible drain hose
1) Never fail to have an individual power specialized for the air conditioner. As for the method of wiring, be guided
by the circuit diagram posted on the inside of control box cover.
2) Provide a circuit breaker switch between power source and the unit.
3) The screws which fasten the wiring in the casing of electrical fittings are liable to come loose from vibrations to
which the unit is subjected during the course of transportation. Check them and make sure that they are all
tightly fastened. (If they are loose, it could give rise to burn-out of the wires.)
4) Specification of power source
5) Confirm that electrical capacity is sufficient.
6) Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage marked on the name plate.
7) Confirm that the cable thickness is as specified in the power sources specification. (Particularly note the relation
between cable length and thickness.)
8) Never fail to equip a leakage breaker where it is wet or moist.
9) The following troubles would be caused by voltage drop-down.
• Vibration of a magnetic switch, damage on the contact point, fuse breaking, disturbance by the normal function of an
overload protection device.
• Proper starting power is not given to the compressor.

HAND OVER
Teach the customer the operation and maintenance procedures, using the operation manual.
(air filter cleaning, temperature control, etc.)

18 Indoor Unit
 Installation

ENGLISH
Dip Switch Setting

1. Indoor Unit
Function Description Setting Off Setting On Default
SW1 Communication N/A (Default) - - Off
SW2 Cycle N/A (Default) - - Off
Selection of Master or
SW3 Group Control Master Slave Off
Slave
Wired/Wireless remote
Dry Contact Selection of Dry controller
SW4 Auto Off
Mode Contact Mode selection of Manual or Auto
operation Mode
Fan continuous Continuous operation
SW5 Installation - Off
operation Removal
SW6 Heater linkage N/A - - Off
Ventilator Selection of Ventilator
Linkage Removal Working
linkage linkage

SW7 Vane selection Selection of up/down Up side Vane Off

Up side + Down side Vane
(Console) side Vane Only
Region Selection tropical Tropical
General model
selection region model
SW8 Etc. Spare - - Off

CAUTION
For Multi V Models, DIP switch 1, 2, 6, 8 must be set OFF.

2. Outdoor Unit
In case that the products meet specific conditions, “Auto addressing” function can start automatically
with the improved speed by turning the DIP switch #3 of the outdoor unit and resetting the power.

※ Specific conditions:
- All names of the indoor units are ARNU****4.
- The serial number of Multi V super IV (outdoor units) is after October 2013.

DIP switch 7 segment

Installation Manual 19
Installation

Group Control Setting

1. Group Control 1
n Wired remote controller 1 + Standard Indoor Units

LGAP Network System

or

GND
Master Slave Slave Slave Signal
12 V

Display Error Message Only connect serial signal and GND lines
between indoor units.

Master

n DIP Switch in PCB

¿ Master Setting ¡ Slave Setting
- No. 3 Off - No. 3 On

Indoor Unit DIP Switch

Some products have no DIP switch on PCB. It is possible to set indoor units to Master or Slave by
using the wireless remote controller instead of DIP switch.
For the details of the setting, please refer to the manual of the wireless remote controller.

1. It is possible to 16 indoor units(Max.) by one wired remote controller.

Set only one indoor unit to Master, set the others to Slave.
2. It is possible to connect with every type of indoor units.
3. It is possible to use wireless remote controller at the same time.
4. It is possible to connect with Dry Contact and Central controller at the same time.
- The Master indoor unit is possible to recognize Dry Contact and Central Controller only.
5. In case that any error occurs at indoor unit, the error code is displayed on the wired remote
controller.
It is possible to control the other indoor units except the error units.

20 Indoor Unit
 Installation
h It is possible to connect indoor units since Feb. 2009.

ENGLISH
h It can be the cause of malfuctions when there is no setting of master and slave.

h In case of Group Control, it is possible to use following functions.

- Selection of operation, stop or mode
- Temperature setting and room temperature check
- Current time change
- Control of flow rate (High/Middle/Low)
- Reservation settings
It is not possible to use some functions.

2. Group Control 2
n Wired remote controllers + Standard Indoor Units

LGAP Network System

or

GND
Master Master Slave Slave Signal
12 V

Donʼt connect serial 12V line

Display Error Message

Master Master

h It is possible to control 16 indoor units(Max.) with the master wired remote control.
h Other than those, it is same with the Group Control 1.

Installation Manual 21
Installation
3. Group Control 3
n Mixture connection with indoor units and Fresh Air Intake Unit

LGAP Network System

or

GND
FAU FAU Master Slave Signal
Master
Master Slave 12 V

N M

Display Error Message Display Error Message

Master Master

h In case of connecting with standard indoor unit and Fresh Air Intake Unit, separate Fresh Air
Intake Unit with standard units. (N, M ≤ 16) (Because setting temperature are different.)
h Other than those, it is same with Group Control 1.

FAU FAU Standard Standard FAU FAU Standard Standard

* FAU : Fresh Air Intake Unit

Standard: Standard Indoor Unit

22 Indoor Unit
 Installation

ENGLISH
4. 2 Remote Control
n Wired remote controller 2 + Indoor unit 1

LGAP Network System

or

GND
Slave Slave Slave Signal
Master 12 V

Display Error Message

Master Slave

1. It is possible to connect two wired remote controllers (Max.) with one indoor unit.
Set only one indoor unit to Master, set the others to Slave.
Set only one wired remote controller to Master, set the others to Slave.
2. Every types of indoor unit is possible to connect two remote controller.
3. It is possible to use wireless remote controller at the same time.
4. It is possible to connect with Dry Contact and Central controller at the same time.
5. In case that any error occurs at indoor unit, the error code is displayed on the wired
remote controller.
6. There isnʼt limits of indoor unit function.

5. Accessories for group control setting

It is possible to set group control by using below accessories.
Indoor unit 2 EA +Wired remote controller Indoor unit 1 EA +Wired remote controller 2EA
h PZCWRCG3 cable used for connection h PZCWRC2 cable used for connection

Mas te r S lave

PZC WRC 2

PZC WRC G3

Maste r S lave
Maste r

CAUTION
• Apply totally enclosed noncombustible conduit in case of local building code Requiring plenum
cable usage.

Installation Manual 23
Installation

E.S.P Table
ARNU073L1G4, ARNU093L1G4 (Unit:CMM (cfm))
Setting Static Pressure(mmAq (in.Aq))
Value 0(0) 1(0.04) 2(0.08) 3(0.12) 4(0.16) 5(0.20)
60 - - - - - -
65 5.03(178) - - - - -
70 5.60(198) 4.85(171) - - - -
75 6.19(219) 5.44(192) 4.57(161) - - -
80 6.79(240) 6.05(214) 5.17(183) - - -
85 7.41(262) 6.67(236) 5.80(205) 4.80(170) - -
90 8.05(284) 7.31(258) 6.43(227) 5.44(192) - -
95 8.71(308) 7.96(281) 7.09(250) 6.09(215) 4.97(176) -
100 9.38(331) 8.63(305) 7.76(274) 6.76(239) 5.64(199) -
105 10.07(356) 9.32(329) 8.45(298) 7.45(263) 6.33(224) 5.08(179)
110 - 10.03(354) 9.16(323) 8.16(288) 7.04(249) 5.79(204)
115 - - 9.88(349) 8.88(314) 7.76(274) 6.51(230)
120 - - - 9.62(340) 8.50(300) 7.25(256)
125 - - - 10.38(367) 9.26(327) 8.01(283)
130 - - - - 10.03(354) 8.78(310)

ARNU123L2G4, ARNU153L2G4, ARNU183L2G4 (Unit:CMM (cfm))

Setting Static Pressure(mmAq (in.Aq))
Value 0(0) 1(0.04) 2(0.08) 3(0.12) 4(0.16) 5(0.20)
75 6.50(230) - - - - -
80 7.34(259) 6.70(237) - - - -
85 8.20(290) 7.55(267) 6.69(236) - - -
90 9.07(320) 8.43(298) 7.56(267) 6.47(228) - -
95 9.96(352) 9.32(329) 8.45(298) 7.36(260) - -
100 10.87(384) 10.22(361) 9.36(331) 8.27(292) 6.96(246) -
105 11.79(416) 11.15(394) 10.28(363) 9.19(325) 7.89(279) 6.35(224)
110 12.73(450) 12.09(427) 11.22(396) 10.14(358) 8.83(312) 7.30(258)
115 13.69(483) 13.05(461) 12.18(430) 11.09(392) 9.78(345) 8.25(291)
120 14.67(518) 14.02(495) 13.16(465) 12.07(426) 10.76(380) 9.23(326)
125 15.66(553) 15.01(530) 14.15(500) 13.06(461) 11.75(415) 10.22(361)
130 16.67(589) 16.02(566) 15.16(535) 14.07(497) 12.76(451) 11.23(397)
135 - - 16.18(571) 15.10(533) 13.79(487) 12.26(433)
140 - - - 16.14(570) 14.83(524) 13.30(470)
145 - - - - 15.89(561) 14.36(507)

ARNU243L3G4 (Unit:CMM (cfm))

Setting Static Pressure(mmAq (in.Aq))
Value 0(0) 1(0.04) 2(0.08) 3(0.12) 4(0.16) 5(0.20)
85 10.19(360) - - - - -
90 12.18(430) 10.71(378) 11.09(392) - - -
95 13.81(488) 12.34(436) 12.19(430) - - -
100 15.16(535) 13.69(483) 13.38(473) 10.71(378) - -
105 16.30(576) 14.83(524) 14.36(507) 11.85(418) - -
110 17.31(611) 15.85(560) 15.23(538) 12.86(454) 10.97(387) -
115 18.27(645) 16.80(593) 16.07(568) 13.82(488) 11.93(421) -
120 19.26(680) 17.79(628) 16.93(598) 14.80(523) 12.91(456) 10.49(370)
125 20.34(718) 18.87(666) 17.89(632) 15.88(561) 13.99(494) 11.57(409)
130 21.60(763) 20.13(711) 19.01(671) 17.14(605) 15.25(539) 12.83(453)
135 - 21.64(764) 20.36(719) 18.66(659) 16.76(592) 14.35(507)
140 - - 22.01(777) 20.50(724) 18.61(657) 16.19(572)
145 - - - 22.75(803) 20.86(737) 18.44(651)

Note :
1. The above table shows the correlation between the air rates and E.S.P.
2. Please refer wired remote controller manual for E.S.P setting procedure.

24 Indoor Unit
 Installation
ARNU073BHA4, ARNU09GBHA4, ARNU123BHA4, ARNU153BHA4,

ENGLISH
ARNU183BHA4, ARNU243BHA4
(Unit : CMM(cfm))
Static Pressure(mm Aq (in. Aq))
Setting Value
3(0.12) 4(0.15) 5(0.19) 6(0.23) 7(0.27) 8(0.31) 9(0.35) 10(0.39) 12(0.47)
70 4.1(145) - - - - - - - -
80 7.6(269) - - - - - - - -
90 10.7(378) 8.1(286) 6.3(223) 4.9(173) - - - - -
100 13.4(473) 11.2(396) 9.6(339) 7.5(265) 4.0(141) - - - -
110 15.9(562) 13.2(466) 12.6(445) 10.3(364) 7.7(272) 5.5(194) - - -
120 18.6(657) 16.2(572) 15.2(537) 12.8(452) 11.1(392) 9.1(322) 6.7(237) 5.3(187) -
130 19.8(700) 18.8(664) 18.0(636) 15.3(541) 14.2(502) 12.4(438) 10.4(367) 8.8(311) 5.7(201)
140 22.3(788) 21.1(746) 20.3(717) 17.7(625) 17.1(604) 15.5(548) 13.7(484) 12.6(445) 9.7(343)
145 23.2(820) 22.2(784) 21.4(756) 19.1(675) 18.4(650) 16.9(597) 15.3(541) 13.8(488) 11.8(417)
150 24.3(859) 23.1(816) 22.3(788) 21.1(746) 19.8(700) 18.3(647) 16.8(594) 15.2(537) 13.0(459)

ARNU073BGA4, ARNU093BGA4, ARNU123BGA4, ARNU153BGA4,

ARNU183BGA4, ARNU243BGA4, ARNU283BGA4, ARNU363BGA4,
ARNU423BGA4
(Unit : CMM(cfm))

Static Pressure(mmAq (in.Aq))

Setting Value
3(0.12) 4(0.15) 5(0.19) 6(0.23) 7(0.27) 8(0.31) 9(0.35) 10(0.39) 12(0.47) 14(0.55) 16(0.62)
70 10.3(363) 4.5(159) - - - - - - - - -
80 13.8(487) 10.4(367) 4.0(141) - - - - - - - -
90 18.5(653) 15.3(540) 12.1(427) 6.9(243) 4.1(145) - - - - - -
100 22.1(780) 19.8(699) 17.0(600) 15.5(547) 11.0(388) 6.2(218) 4.2(148) - - - -
110 26.7(943) 24.6(869) 21.4(755) 19.6(692) 17.5(619) 14.0(494) 11.6(409) 6.6(233) - - -
120 29.6(1045) 28.5(1007) 25.8(911) 24.0(847) 21.8(769) 19.8(699) 17.9(632) 14.6(515) 12.1(427) - -
130 33.4(1180) 32.5(1148) 30(1059) 28.5(1006) 26.9(951) 25.3(893) 23.4(826) 21.8(769) 18.1(639) 14.6(515) 11.3(399)
140 37.3(1318) 36.5(1289) 36.0(1271) 32.1(1133) 30.4(1073) 29.0(1024) 27.4(697) 25.9(914) 21.6(762) 17.8(628) 14.5(512)
143 38.6(1363) 37.4(1320) 37.5(1324) 33.9(1197) 32.1(1133) 30.7(1084) 28.8(1017) 27.2(960) 23.0(812) 20.1(709) 16.8(593)
150 41.1(1451) 40.1(1416) 41.0(1447) 38.0(1342) 36.0(1271) 34.5(1218) 32.1(1133) 30.1(1063) 26.3(928) 22.4(791) 18.2(642)
160 44.3(1564) 43.4(1533) 42.4(1497) 41.6(1469) 38.2(1349) 36.1(1274) 35.0(1236) 34.6(1221) 31.1(1098) 26.8(946) 23.3(822)

ARNU283BRA4, ARNU363BRA4, ARNU423BRA4, ARNU483BRA4,

ARNU543BRA4
(Unit : CMM(cfm))
Static Pressure(mmAq (in.Aq))
Setting Value
5(0.19) 6(0.23) 8(0.31) 10(0.39) 12(0.47) 14(0.55) 15(0.59) 16(0.62) 17(0.66) 18(0.70) 20(0.78)
91 46.5(1642) 43.7(1543) 38.2(1349) 31.3(1105) 23.2(819) 14.0(494) 9.0(317) 3.7(130) - - -
96 49.9(1762) 46.1(1628) 43.0(1518) 33.5(1183) 31.1(1098) 18.4(649) 13.7(483) 9.0(317) 2.6(91) - -
101 52.1(1839) 50.2(1772) 47.9(1691) 39.5(1395) 37.4(1320) 27.3(964) 25.2(889) 17.8(628) 8.9(314) 6.1(215) -
106 51.4(1815) 51.2(1808) 50.4(1779) 44.4(1568) 43.1(1522) 33.3(1176) 32.1(1133) 28.9(1020) 21.0(741) 17.9(632) 8.3(293)
111 53.6(1892) 53.7(1896) 52.9(1868) 49.9(1762) 48.3(1705) 40.6(1433) 40.2(1419) 32.8(1158) 31.5(1112) 27.2(960) 17.5(618)
116 - - - 55.7(1967) 50.8(1794) 44.8(1582) 42.6(1504) 40.1(1416) 37.6(1327) 32.5(1147) 27.6(974)
121 - - - - 52.2(1843) 50.8(1794) 50.3(1776) 45.7(1613) 44.6(1575) 38.8(1370) 32.2(1137)
126 - - - - - - 54.4(1921) 51.2(1808) 50.4(1779) 46.0(1624) 43.5(1536)

Note: 1. The above table shows the correlation between the air rates and E.S.P.

Installation Manual 25
Installation
ARNU363B8A4, ARNU423B8A4, ARNU483B8A4, ARNU543B8A4,
ARNU763B8A4, ARNU963B8A4 (Unit : CMM(cfm))

Static Pressure(mmAq (in.Aq))

Setting Value
6(0.23) 9(0.35) 12(0.47) 15(0.59) 18(0.71) 20(0.79) 22(0.86) 23(0.90) 25(0.98)
60 40.5(1430) - - - - - - - -
65 52.7(1861) 39.3(1388) - - - - - - -
70 63.7(2249) 47.1(1663) - - - - - - -
75 71.1(2511) 56.9(2009) 44.7(1578) - - - - - -
80 76.3(2694) 69.7(2461) 55.2(1949) - - - - - -
85 83.3(2941) 78.6(2775) 67.4(2380) 55.9(1974) 31.8(1123) - - - -
91 89.7(3167) 87.1(3076) 78.9(2786) 67.6(2387) 54.2(1914) - - - -
95 93.4(3298) 91.4(3227) 86.1(3040) 77.0(2719) 66.4(2345) 50.6(1787) 30.0(1059) - -
100 93.4(3298) 91.4(3227) 88.3(3118) 84.9(2998) 75.9(2680) 69.5(2454) 60.8(2147) 43.1(1522) -
105 93.2(3291) 91.3(3224) 88.3(3118) 84.9(2998) 81.1(2864) 77.4(2733) 72.0(2542) 68.0(2401) 52.0(1836)

Note:
1. The above table shows the correlation between the air rates and E.S.P.
2. The above table shows the available E.S.P. range.
3. If the E.S.P. of the installed indoor is less than the lowest value(as mention in the table), indoor components can be failed.

26 Indoor Unit
 Please call the installing contractor of your product, as warranty service will be
US
provided by them.
Service call Number # : (888) LG Canada, (888) 542-2623
CANADA
Numéro pour les appels de service : LG Canada, 1-888-542-2623