LG RAS-24MH1, RAC-24MH1 Installation Manual

ENGLISH

LG
Room Air Conditioner

INSTALLATION MANUAL

LG

website http://www.lgservice.com

IMPORTANT

• Please read this instruction manual completely before
installing the product.

• When the power cord is damaged, replacement should be
performed by authorized personnel only.

• 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.

FRANÇAIS ESPAÑOL

2 Room Air Conditioner

Room Air Conditioner Installation Manual

TABLE OF CONTENTS

Safety Precautions............................4

Introduction ........................................7

Symbols used in this manual..........7

Features ...........................................7

Installation ..........................................8

Installation parts...............................8

Installation tools ...............................8

Installation map................................9

Confirm The Refrigerant ...............10

Selecting the best location ...........11

Piping length and elevation...........12

Fixing installation plate ..................13

Drilling a hole in the wall ...............13

Flaring work ...................................14

Connecting the piping ..................15

Connecting the cables ..................21

Checking the drainage ..................24

Forming the piping.........................25

Air purging......................................26

Test running ...................................28

Installation guide at the seaside ...30

❏ Four type "A" screws & plastic

anchors

❏ Connecting cable

❏ Installation guide map

❏ Pipes: Gas side

Liquid side

❏ Insulation materials

❏ Additional drain pipe

[Outer diameter......15.5mm(0.61in)]

❏ Two type "B" screws

❏ Level gauge

❏ Screw driver

❏ Electric drill

❏ Hole core drill [ø70mm(2.76in)]

❏ Horizontal meter

❏ Flaring tool set

❏ Specified torque wrenches

1.8kg.m, 4.2kg.m, 5.5kg.m,

6.6kg.m
(different depending on model No.)

❏ Spanner ........................Half union

❏ A glass of water

❏ Screw driver

❏ Hexagonal wrench(4mm)

❏ Gas-leak detector

❏ Vacuum pump

❏ Gauge manifold

❏ Owner's manual

❏ Thermometer

❏ Remote control holder

Installation

Requirements

Required Parts Required Tools

ENGLISH

Installation Manual 3

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.

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.

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.

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.

WARNING

WARNING

• Installation or repairs made by unqualified persons can result in hazards to you and others.
Installation MUST conform with local building codes or, in the absence of local codes, with the National Electrical
Code NFPA 70/ANSI C1-1993 or current edition and Canadian Electrical Code Part1 CSA C.22.1.

• 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.

Wall Mounted Mini-Split System

Single Zone

INSTALLATION INSTRUCTIONS

4 Room Air Conditioner

Safety Precautions

To prevent the injury of the user or other people and property damage, the following instructions
must be followed.

■ Be sure to read before installing the air conditioner.

■ Be sure to observe the cautions specified here as they include important items related to safety.

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is

classified by the following indications.

■ The meanings of the symbols used in this manual are as shown below.

This symbol indicates the possibility of death or serious injury.

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

■ Installation

Be sure not to do.

Be sure to follow the instruction.

Safety Precautions

Always perform grounding.

• Otherwise, it may cause
electrical shock.

Don’t use a power cord, a
plug or a loose socket which
is damaged.

• Otherwise, it may cause a fire
or electrical shock.

For installation of the product,
always contact the service
center or a professional
installation agency.

• Otherwise, it may cause a fire,
electrical shock, explosion or
injury.

Securely attach the electrical
part cover to the indoor unit
and the service panel to the
outdoor unit.

• If the electrical part cover of the
indoor unit and the service
panel of the outdoor unit are not
attached securely, it could result
in a fire or electric shock due to
dust, water, etc.

Always install an air leakage
breaker and a dedicated
switching board.

• No installation may cause a fire
and electrical shock.

Do not keep or use flammable
gases or combustibles near
the air conditioner.

• Otherwise, it may cause a fire
or the failure of product.

Ensure that an installation frame of the
outdoor unit is not damaged due to use for a
long time.

• It may cause injury or an accident.

Do not disassemble or repair the product
randomly.

• It will cause a fire or electrical shock.

Installation Manual 5

ENGLISH

Safety Precautions

Do not install the product at a place that there
is concern of falling down.

• Otherwise, it may result in personal injury.

Use caution when unpacking and installing.

• Sharp edges may cause injury.

Take the power plug out if
necessary, holding the head
of the plug and do not touch
it with wet hands.

• Otherwise, it may cause a fire
or electrical shock.

Do not use the power cord
near the heating tools.

• Otherwise, it may cause a fire
and electrical shock.

Do not open the suction
inlet of the indoor/outdoor
unit during operation.

• Otherwise, it may electrical
shock and failure.

Do not allow water to run
into electrical parts.

• Otherwise, it may cause the
failure of machine or electrical
shock.

Hold the plug by the head
when taking it out.

• It may cause electric shock
and damage.

Never touch the metal parts
of the unit when removing
the filter.

• They are sharp and may
cause injury.

Do not share the outlet with
other appliances.

• It will cause an electric shock
or a fire due to heat
generation.

Do not use the damaged
power cord.

• Otherwise, it may cause a fire
or electrical shock.

Do not modify or extend the
power cord randomly.

• Otherwise, it may cause a fire
or electrical shock.

Take care so that the power
cord may not be pulled
during operation.

• Otherwise, it may cause a fire
or electrical shock.

Unplug the unit if strange
sounds, smell, or smoke
comes from it.

• Otherwise, it may cause
electrical shock or a fire.

Keep the flames away.

• Otherwise, it may cause a fire.

Do not step on the indoor/outdoor unit and
do not put anything on it.

• It may cause an injury through dropping of the
unit or falling down.

Do not place a heavy object on the power
cord.

• Otherwise, it may cause a fire or electrical
shock.

When the product is submerged into water,
always contact the service center.

• Otherwise, it may cause a fire or electrical
shock.

Take care so that children may not step on
the outdoor unit.

• Otherwise, children may be seriously injured
due to falling down.

■ Operation

6 Room Air Conditioner

Safety Precautions

■ Installation

Install the drain hose to ensure that drain
can be securely done.

• Otherwise, it may cause water leakage.

Install the product so that the noise or hot
wind from the outdoor unit may not cause
any damage to the neighbors.

• Otherwise, it may cause dispute with the
neighbors.

Always inspect gas leakage after the
installation and repair of product.

• Otherwise, it may cause the failure of product.

Keep level parallel in installing the product.

• Otherwise, it may cause vibration or water
leakage.

Avoid excessive cooling and perform
ventilation sometimes.

• Otherwise, it may do harm to your health.

Use a soft cloth to clean. Do not use wax,
thinner, or a strong detergent.

• The appearance of the air conditioner may
deteriorate, change color, or develop surface
flaws.

Do not use an appliance for special purposes
such as preserving animals vegetables,
precision machine, or art articles.

• Otherwise, it may damage your properties.

Do not place obstacles around the flow inlet
or outlet.

• Otherwise, it may cause the failure of appliance
or an accident.

■ Operation

Installation Manual 7

ENGLISH

Introduction

This symbol alerts you to the risk of electric shock.

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

This symbol indicates special notes.

NOTICE

Introduction

Symbols used in this Manual

Features

Air Inlet

Front Panel

Air Filter

Signal Receptor

Air Intake Vents

Base Plate

Air Outlet Vents

Connecting
Wires

Drain Hose

8 Room Air Conditioner

Installation

Type "A" screw and plastic anchor

Type "B" screw

Remote control holder

Installation plate

Figure FigureName

Screw driver

Electric drill

Measuring tape, Knife

Hole core drill

Spanner

Torque wrench

Ohmmeter

Hexagonal wrench

Ammeter

Gas-leak detector

Thermometer,

Horizontal meter

Flaring tool set

Name

Installation Parts

Installation Tools

Installation

Read carefully, and then follow step by step.

Installation Manual 9

ENGLISH

Installation

Installation Map

Installation parts you should purchase.

NOTE: refrigerant line wall thickness must be at least 0.8 mm(0.031 inch)

Air Discarge

Forced Operation Button

Operation Indication Lamps/

Signal Receptor

Vinyl tape (Wide)

• Apply after carrying out a
drainage test.

• To carry out the drainage
test, remove the air filters
and pour water into the heat
exchanger.

Saddle

Gas side piping (Optional Parts)
Liquid side piping (Optional Parts)
Additional drain pipe

Vinyl tape (Narrow)
Drain Hose

Base Plate

Air Outlet Vents

Air Inlet Vents

Connecting cable
(Optional Parts)

Installation plate
Sleeve

Bushing-Sleeve

Putty(Gum Type Sealer)

Bend the pipe as closely
on the wall as possible,
but be careful that it
doesn't break.

NOTICE

10 Room Air Conditioner

Installation

1. Check the quality label on the indoor and outdoor unit.

2. Make certain that the refrigerant is R-410A.

THIS PRODUCT CONTAINS R-410A REFRIGERANT

1) Different compressor oil

- R-410A(Polyol ester) / R-22(Mineral).

- Do not mix the existing mineral oil.

- Do not apply used pipe, tools and gauges covered with the existing mineral oil.

2) Absorption of moisture

-Compressor’s oil has the high absorption rate of moisture.

3) Composition

- R-410A(R32:R125=50:50wt%).
NOTE: Never mix with other refrigerants

4) High pressure.

- 1.6 times higher than R-22.

- High Pressure refrigerant may cause personal injury.

Do not handle the pipe by yourself (customer) High-pressure refrigerant may cause personal injury.

- manifold gauge ,charging and any piping tools must be dedicated to R-410A systems.

NOTICE

Confirm The Refrigerant

Example : Split type 12,000 Btu/h

120

100

100%

100%70%50%30%0%

70% 50% 30%

0%

100

93

89

84

76

80

60

40

20

0
R-410A
R-22

Boiling Pt.(

°C) Vapor pressure(25°C)(kg f/cnf) Vapor density(25°C)(kg/m2)

R-410A -51.4 15.9 64
R-22 -40.8 9.6 44.4

Installation Manual 11

ENGLISH

Installation

Indoor unit

1. Do not have any heat or steam near the unit.

2. Select a place where there are no obstacles
in front of the unit.

3. Make sure that condensation drainage can be
conveniently routed away.

4. Do not install near a doorway.

5. Ensure that the interval between a wall and
the left (or right) of the unit is more than
10cm(3.9in). The unit should be installed as
high as possible on the wall, allowing a
minimum of 20cm(7.9in) from ceiling.

6. Use a stud finder to locate studs to prevent
unnecessary damage to the wall.

Outdoor unit

1. If an awning is built over the unit to prevent
direct sunlight or rain exposure, make sure
that heat radiation from the condenser is not
restricted.

2. Ensure that the space around the back and
sides is more than 30cm(11.8in). The front of
the unit should have more than 70cm(27.6in)
of space.

3. Do not place animals and plants in the path
of the warm air.

4. Take the weight of the air conditioner into
account and select a place where noise and
vibration are minimum.

5. Select a place where the warm air and noise
from the air conditioner do not disturb
neighbors.

Select the best Location

More than
20cm(7.9in)

More than

10cm(3.9in)

More than

2.3m(7.6ft)

More than
10cm(3.9in)

More than
30cm(11.8in)

More than
30cm(11.8in)

More than
60cm(23.6in)

More than 60cm(23.6in)

More than
70cm(27.6in)

Install the indoor unit on the wall where the height from the floor is more than 2.3 meters(7.6ft).
A minimum pipe run of 7.5 meters(24.6ft) is required to minimize vibration & excessive noise

12 Room Air Conditioner

Installation

Piping Length and Elevation

Outdoor unit

Indoor unit

A

B

Outdoor unit

Indoor unit

A

B

A

Oil trap

Outdoor unit

Indoor unit

B

If piping length is more than 5m(16.4ft)

Capacity is based on standard length and maximum allowance length is on the basis of reliability.
Oil trap should be installed every 5~7 meters(16.4~23.0ft).

30k 5/8" 1/4" 7.5(25) 7(23) 30(98) 20(0.22)

Pipe Size

Capacity

(Btu/h)

GAS LIQUID

Max.

Length A

m(ft)

Additional Refrigerant

g/m(oz/ft)

Max.

Elevation B

m(ft)

Standard Length

m(ft)

Installation Manual 13

ENGLISH

Installation

The wall you select should be strong and solid
enough to prevent vibration

1. Mount the installation plate on the wall with
type "A" screws. If mounting the unit on a
concrete wall, use anchor bolts.

• Mount the installation plate horizontally by

aligning the centerline using a level.

2. Measure the wall and mark the centerline. It
is also important to use caution concerning
the location of the installation plate-routing
of the wiring to power outlets is through the
walls typically. Drilling the hole through the
wall for piping connections must be done
safely.

3. Install after removing one of the indicated
cutting phase according to the installation
location of the indoor unit's piping.

Fixing Installation Plate

Installation Plate

Type "A" screw

Chassis

Hook

Installation plate

Left rear piping Right rear piping

C

D

B

A

• Drill the piping hole with a ø70mm(2.76in)

hole core drill. Drill the piping hole at either
the right or the left with the hole slightly
slanted to the outdoor side.

Drill a Hole in the Wall

5-7mm

(3/16"~5/16")

Indoor

WALL

Outdoor

Cutting Phase

ABCD

SD 120(4.7) 110(4.3) 43(1.7) 43(1.7)

CHASSIS

(Grade)

Distance mm(in)

14 Room Air Conditioner

Installation

Flaring Work

Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the
following procedure.

Cut the pipes and the cable.

1. Use the piping kit accessory or the pipes
purchased locally.

2. Measure the distance between the indoor and
the outdoor unit.

3. Cut the pipes a little longer than measured
distance.

4. Cut the cable 1.5m(59.1in) longer than the pipe
length.

Burrs removal

1. Completely remove all burrs from the cut cross
section of pipe/tube.

2. Put the end of the copper tube/pipe in a
downward direction as you remove burrs in
order to avoid dropping burrs into the tubing.

Putting nut on

• Remove flare nuts attached to indoor and

outdoor unit, then put them on pipe/tube having
completed burr removal.
(not possible to put them on after flaring work)

Flaring work

1. Firmly hold copper pipe in a die in the dimension
shown in the table below.

2. Carry out flaring work with the flaring tool.

Copper

pipe

90°

Slanted Uneven Rough

Pipe

Reamer

Point down

Flare nut

Copper tube

mm inch mm

Ø6.35 1/4 1.1~1.3
Ø9.52 3/8 1.5~1.7

Ø12.7 1/2 1.6~1.8
Ø15.88 5/8 1.6~1.8
Ø19.05 3/4 1.9~2.1

Outside diameter A

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Installation Manual 15

ENGLISH

Installation

Check

1. Compare the flared work with the figure by.

2. If a flared section is defective, cut it off and
do flaring work again.

Indoor

1. Prepare the indoor unit's piping and drain hose for installation through the wall.

2. Remove the plastic tubing retainer(see the
illustration by) and pull the tubing and drain
hose away from chassis.

3. Replace only the plastic tubing holder 1, not
the holder 2 in the original position.

1. Route the indoor tubing and the drain hose in
the direction of rear right.

2.

Insert the connecting cable into the indoor unit
from the outdoor unit through the piping hole.

• Do not connect the cable to the indoor unit.

• Make a small loop with the cable for easy

connection later.

3. Tape the tubing, drain hose, and the
connecting cable. Be sure that the drain hose
is located at the lowest side of the bundle.
Locating at the uper side can cause drain pan
to overflow inside the unit.

If the drain hose is routed inside the room,
insulate the hose with an insulation material*
so that dripping from "sweating"(condensation)
will not damage furniture or floors.
*Foamed polyethylene or equivalent is
recommended.

Inclined

Inside is shiny without scratches

Smooth all round

Even length

all round

Surface

damaged

Cracked Uneven

thickness

= Improper flaring =

Connecting the Piping

For right rear piping

Drain hose

Connecting
pipe

Connecting cable

Tape

Drain hose

16 Room Air Conditioner

Installation

4. Indoor unit installation
Hook the indoor unit onto the upper portion of
the installation plate.(Engage the two hooks
of the rear top of the indoor unit with the
upper edge of the installation plate.) Ensure
that the hooks are properly seated on the
installation plate by moving it left and right.

Press the lower left and right sides of the unit
against the installation plate until the hooks
engage into their slots(clicking sound).

Connecting the piping to the indoor unit and
drain hose to drain pipe.

1. Align the center of the pipes and sufficiently
tighten the flare nut by hand.

2. Tighten the flare nut with a wrench.

3. When extending the drain hose at the indoor
unit, install the drain pipe.

Wrap the insulation material around the
connecting portion.

1. Overlap the connection pipe insulation
material and the indoor unit pipe insulation
material. Bind them together with vinyl tape
so that there may be no gap.

2. Wrap the area which accommodates the rear
piping housing section with vinyl tape.

3. Bundle the piping and drain hose together by
wrapping them with vinyl tape for enough to
cover where they fit into the rear piping
housing section.

Drain hose

Connecting

cable

Indoor unit tubing Flare nut Pipes

Wrench

Indoor unit tubing

Open-end wrench (fixed)

Connection pipe

Flare nut

Vinyl tape(narrow)

Adhesive

Drain pipe

Indoor unit drain hose

Plastic bands

Insulation material

Vinyl tape(narrow)

Connection pipe

Connecting cable

Vinyl tape (wide)

Wrap with vinyl tape

Indoor unit pipe

Pipe

Wrap with vinyl tape

Drain hose

Pipe

Vinyl tape(wide)

mm inch kg.m

Ø6.35 1/4 1.8~2.5
Ø9.52 3/8 3.4~4.2
Ø12.7 1/2 5.5~6.6

Ø15.88 5/8 6.3~8.2

Outside diameter Torque

Installation Manual 17

ENGLISH

Installation

1. Route the indoor tubing and the drain hose to
the required piping hole position.

2. Insert the piping, drain hose, and the
connecting cable into the piping hole.

3.

Insert the connecting cable into the indoor unit.

• Don't connect the cable to the indoor unit.

• Make a small loop with the cable for easy

connection later.

4. Tape the drain hose and the connecting
cables.

5. Indoor unit installation

• Hang the indoor unit from the hooks at the

top of the installation plate.

• Insert the spacer etc. between the indoor

unit and the installation plate and separate
the bottom of the indoor unit from the wall.

Connecting the piping to the indoor unit and
the drain hose to drain pipe.

1. Align the center of the pipes and sufficiently
tighten the flare nut by hand.

2. Tighten the flare nut with a wrench.

3. When extending the drain hose at the indoor
unit, install the drain pipe.

For left rear piping

Drain pipe

Connecting

cable

1 2

Installation plate

Spacer

Indoor unit

8cm

Indoor unit tubing Flare nut Pipes

Wrench

Indoor unit tubing

Connection pipe

Flare nut

Open-end wrench (fixed)

Vinyl tape

Adhesive

Drain hose

Indoor unit drain hose

(narrow)

mm inch kg.m

Ø6.35 1/4 1.8~2.5
Ø9.52 3/8 3.4~4.2
Ø12.7 1/2 5.5~6.6

Ø15.88 5/8 6.3~8.2

Outside diameter Torque

18 Room Air Conditioner

Installation

Wrap the insulation material around the
connecting portion.

1. Overlap the connection pipe heat insulation
and the indoor unit pipe heat insulation
material. Bind them together with vinyl tape
so that there may be no gap.

2. Wrap the area which accommodates the rear
piping housing section with vinyl tape.

3. Bundle the piping and drain hose together by
wrapping them with cloth tape over the range
within which they fit into the rear piping
housing section.

Reroute the pipings and the drain hose
across the back of the chassis.

Indoor unit installation

1. Remove the spacer.

2. Ensure that the hooks are properly seated on
the installation plate by moving it left and
right.

3. Press the lower left and right sides of the unit
against the installation plate until the hooks
engage into their slots(clicking sound).

Plastic bands

Insulation material

Vinyl tape(narrow)

Connection
pipe

Connecting cable

Indoor
unit piping

Pipe

Vinyl tape
(wide)

Wrap with vinyl tape

Drain hose

Vinyl tape(narrow)

Pipe

Wrap with
vinyl tape(wide)

Piping for
passage through
piping hole

Drain hose

Connecting

cable

Installation Manual 19

ENGLISH

Installation

Good case

• Press on the upper side of clamp and unfold the tubing to downward slowly.

Bad case

• Following bending type from right to left may cause damage to the tubing.

Installation Information. For left piping. Follow the instruction below.

20 Room Air Conditioner

Installation

Outdoor

Align the center of the pipings and sufficiently
tighten the flare nut by hand.

Finally, tighten the flare nut with torque wrench
until the wrench clicks.

• When tightening the flare nut with torque

wrench, ensure the direction for tightening
follows the arrow on the wrench.

mm inch kg.m

Ø6.35 1/4 1.8~2.5
Ø9.52 3/8 3.4~4.2

Ø12.7 1/2 5.5~6.6
Ø15.88 5/8 6.3~8.2
Ø19.05 3/4 9.9~12.1

Outside diameter Torque

Outdoor unit

Liquid side piping
(Smaller diameter)

Gas side
piping
(Bigger
diameter)

Torque wrench

Installation Manual 21

ENGLISH

Installation

Connecting the Cables

Indoor

Connect the cable to the indoor unit by connecting the wires to the terminals on the control
board individually according to the outdoor unit connection. (Ensure that the color of the wires

of the outdoor unit and the terminal No. are the same as those of the indoor unit.)

The earth wire should be longer than the common wires.
The circuit diagram is not subject to change without notice.
When installing, refer to the electrical diagram behind the front panel of Indoor Unit.
The wiring for the outdoor unit can be found on the inside of the Outdoor Unit control cover.

• The circuit diagram is not subject to change without notice.

• Be sure to connect wires according to the wiring diagram.

• Connect the wires firmly, so that not to be pulled out easily.

• Connect the wires according to color codes by referring to the wiring diagram.

Provide a circuit breaker between
power source and the outdoor unit as
shown below.

The power cord connected to the outdoor unit should be complied with the following
specifications (ETL recognized and CSA certified).

The power connecting cable connected to the indoor and outdoor unit should be
complied with the following specifications

(ETL recognized and CSA certified).

Air

Conditioner

Main power source

Circuit Breaker
Use a circuit breaker
or time delay fuse.

GN/YL

20mm

AWG18

Power supply cable (230/208V)

When using the separate wire as the power cord, please fix the separate wire into the
control box panel by using tie wrap as the fixture.

Model

30k 1ø,230/208V 30A

Power source

Fuse or breaker

Capacity

GN/YL

20mm

Power supply cable (230/208V)

30k

AWG14

22 Room Air Conditioner

Installation

Outdoor

1. Remove the cover control from the unit by
loosening the screw.
Connect the wires to the terminals on the
control board individually as the following.

2. Secure the cable onto the control board with
the holder (clamper).

3. Refix the cover control to the original position
with the screw.

1. Separately wire power supply cord and connecting cable.

2. Use heat-proof electrical wiring capable of withstanding temperature up to 75°C(167°F).

3. Use outdoor and waterproof connection cable rated more than 300V for the connection between
indoor and outdoor unit. (For example, Type SJO-WA)

• Be sure to comply with local codes while running the wire from the indoor unit to the outdoor
unit(size of wire and wiring method, etc).

• Every wire must be connected firmly.

• No wire should be allowed to touch refrigerant tubing, the compressor or any moving parts.

NOTICE

Outdoor unit

Terminal block

Over 5mm

(0.2")

Cover control

Conduit panel

Connecting

cable

Power supply

cord

Wiring Diagram

Installation

Installation Manual 23

ENGLISH

How to connect wiring to the terminals

For strand wiring

(1) Cut the wire end with a wire cutter or wire-

cutting pliers, then strip the insulation to
expose the strand wiring about 10mm(3/8").

(2) Using a screwdriver, remove the terminal

screw(s) on the terminal plate.

(3) Using a round terminal fastener or pliers,

securely clamp each stripped wire end with a
round terminal.

(4) Position the round terminal wire, and replace

and tighten the terminal screw using a
screwdriver.

Power supply cable

Connecting cable

Strip 10mm(3/8")

Round
terminal

Connecting cable

Loosening the
terminal block
screw

Fastening the
wire tightly

Strand wire

According to the confirmation of the above conditions, prepare the wiring as
follows.

1. Never fail to have an individual power circuit specifically for the air conditioner.
As for the method of wiring, be guided by the circuit diagram posted on the
inside of control cover.

2. The screw 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 cause burn-out of the wires.)

3. Specification of power source.

4. Confirm that electrical capacity is sufficient.

5. See to that the starting voltage is maintained at more than 90 percent of the
rated voltage marked on the name plate.

6. Confirm that the cable thickness is as specified in the power source
specification. (Particularly note the relation between cable length and thickness.

7. Always install an earth leakage circuit breaker in a wet or moist area.

8. The following would be caused by voltage drop.

• Vibration of a magnetic switch, which will damage the contact point, fuse breaking,

disturbance of the normal function of the overload.

9. The means for disconnection from a power supply shall be incorporated in the
fixed wiring and have an air gap contact separation of at least 3mm(0.12") in
each active(phase) conductors.

24 Room Air Conditioner

Installation

Checking the Drainage

To check the drainage.

1. Pour a glass of water on the evaporator.

2. Ensure the water flows through the drain
hose of the indoor unit without any leakage
and goes out the drain exit.

Drain piping

1. The drain hose should point downward for
easy drain flow.

2. Do not make drain piping like the following.

Drain pan

Drain

hose

Leakage
checking

Connecting area

drain hose

Leakage
checking

Downward slope

Do not raise

Accumulated
drain water

Tip of drain hose
dipped in water

Air

Waving

Water
leakage

Water
leakage

Ditch

Less than
50mm gap

Water
leakage

Installation Manual 25

ENGLISH

Installation

Forming the Piping

Form the piping by wrapping the
connecting portion of the indoor unit
with insulation material and secure it
with two kinds of vinyl tapes.

• If you want to connect an additional drain
hose, the end of the drain outlet should be
routed above the ground. Secure the drain
hose appropriately.

In cases where the outdoor unit is
installed below the indoor unit
perform the following.

1. Tape the piping, drain hose and connecting

cable from down to up.

2. Secure the tapped piping along the exterior

wall using saddle or equivalent.

In cases where the Outdoor unit is
installed above the Indoor unit
perform the following.

1. Tape the piping and connecting cable from

down to up.

2. Secure the taped piping along the exterior

wall. Form a trap to prevent water entering
the room.

3. Fix the piping onto the wall by saddle or

equivalent.

Taping

Drain hose

Pipings

Connecting cable

Trap is required to prevent water
from entering into electrical parts.

Seal small openings
around pipings with a
gum type sealer.

Taping

Drain hose

Pipings

Connecting cable

Trap is required to prevent water
from entering into electrical parts.

Seal small openings
around pipings with a
gum type sealer.

Seal a small opening
around the pipings
with gum type sealer.

Trap

Trap

26 Room Air Conditioner

Installation

Air Purging

Air purging

The air and moisture remaining in the refrigerant system have undesirable effects as indicated below.

1. Pressure in the system rises.

2. Operating current rises.

3. Cooling(or heating) efficiency drops.

4. Moisture in the refrigerant circuit may freeze and block capillary tubing.

5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, after evacuating the system, take a leak test for the piping and tubing between the
indoor and outdoor unit.

Air purging with vacuum pump

1. Preparation

• Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units have been
properly connected and all wiring for the test run has been completed. Remove the service valve caps
from both the gas and the liquid side on the outdoor unit. Note that both the liquid and the gas side
service valves on the outdoor unit are kept closed at this stage.

2. Leak test

• Connect the manifold valve(with pressure gauges) and dry nitrogen gas cylinder to this service port with
charge hoses.

Be sure to use a manifold valve for air purging. If it is not available, use a stop valve for this purpose.
The "Hi" knob of the manifold valve must always be kept close.

• Pressurize the system to no more than 150 P.S.I.G. with dry nitrogen gas and close the cylinder valve

when the gauge reading reached 150 P.S.I.G. Next, test for leaks with liquid soap.

To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder must be
higher than its bottom when you pressurize the system. Usually, the cylinder is used in a vertical
standing position.

1. Do a leak test of all joints of the

tubing(both indoor and outdoor)
and both gas and liquid side
service valves.
Bubbles indicate a leak. Be sure to
wipe off the soap with a clean
cloth.

2. After the system is found to be free

of leaks, relieve the nitrogen
pressure by loosening the charge
hose connector at the nitrogen
cylinder. When the system pressure
is reduced to normal, disconnect
the hose from the cylinder.

Lo Hi

Indoor unit

Outdoor unit

Manifold valve

Charge hose

Nitrogen gas
cylinder(in vertical
standing position)

Pressure
gauge

Installation Manual 27

ENGLISH

Installation

Soap water method

1. Remove the caps from the 2-way and 3-way valves.

2. Remove the service-port cap from the 3-way valve.

3. To open the 2-way valve turn the valve stem
counterclockwise approximately 90°, wait for about
2~3 sec, and close it.

4. Apply a soap water or a liquid neutral detergent on
the indoor unit connection or outdoor unit
connections by a soft brush to check for leakage of
the connecting points of the piping.

5. If bubbles come out, the pipes have leakage

Evacuation

1. Connect the charge hose end described in the
preceding steps to the vacuum pump to
evacuate the tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is
open. Then, run the vacuum pump.
The operation time for evacuation varies with
tubing length and capacity of the pump. The
following table shows the time required for
evacuation.

2. When the desired vacuum is reached, close the
"Lo" knob of the manifold valve and stop the
vacuum pump.

Finishing the job

1. With a service valve wrench, turn the valve stem
of liquid side valve counter-clockwise to fully
open the valve.

2. Turn the valve stem of gas side valve counter­clockwise to fully open the valve.

3. Loosen the charge hose connected to the gas
side service port slightly to release the pressure,
then remove the hose.

4. Replace the flare nut and its bonnet on the gas
side service port and fasten the flare nut
securely with an adjustable wrench. This
process is very important to prevent leakage
from the system.

5. Replace the valve caps at both gas and liquid
side service valves and fasten them tight.

This completes air purging with a vacuum pump.
The air conditioner is now ready to test run.

Gas side

Liquid side

Cap

Hexagonal wrench

2-way valve

(Open)

3-way valve

(Close)

Required time for evacuation when 30 gal/h vacuum

pump is used

10 min. or more 15 min. or more

If tubing length is less

than 10m (33 ft)

If tubing length is longer

than 10m (33 ft)

Indoor unit

Outdoor unit

Lo Hi

Manifold valve

Vacuum pump

Pressure
gauge

Open

Close

28 Room Air Conditioner

Installation

1. Check that all tubing and wiring are properly connected.

2. Check that the gas and liquid side service valves are fully open.

Prepare remote controller

1. Remove the battery cover by pulling it
according to the arrow direction.

2. Insert new batteries making sure that the (+)
and (–) of battery are installed correctly.

3. Reattach the cover by pushing it back into
position.

• Use 2 AAA(1.5volt) batteries. Do not use
rechargeable batteries.

• Remove the batteries from the remote
controller if the system is not used for a long
time.

Settlement of outdoor unit

1. Anchor the outdoor unit with a bolt and
nut[ø10mm(0.39in)] tightly and horizontally on
a concrete or rigid mount.

2. When installing on the wall, roof or rooftop,
anchor the mounting base securely with a
nail or wire assuming the influence of wind
and earthquake.

3. If the vibration of the unit is transmitted to the
hose, secure the unit with an anti-vibration
rubber.

Evaluation of the performance

Operate the unit for 15~20 minutes, then check
the system refrigerant charge:

1. Measure the pressure of the gas side service
valve.

2. Measure the temperature of the intake and
discharge of air.

3. Ensure the difference between the intake
temperature and the discharge is more than
8°C

4. For reference; the gas side pressure of
optimum condition is as below.(Cooling)

The air conditioner is now ready for use.

NOTICE

Bolt

Tubing connection

Discharge
temperature

Discharge air

Intake temperature

R-22 35°C (95°F) 4~5kg/cm2G(56.8~71.0 P.S.I.G.)

R-410A 35°C (95°F) 8.5~9.5kg/cm2G(120~135 P.S.I.G.)

Outside ambient

TEMP.

Refrigerant

The pressure of the gas side

service valve.

Test Running

Installation Manual 29

ENGLISH

Installation

If the actual pressure is higher than shown, the system is most likely over-charged, and charge
should be removed. If the actual pressure are lower than shown, the system is most likely
undercharged, and charge should be added.

NOTICE

PUMP DOWN

This is performed when the unit is relocated or the refrigerant circuit is serviced.

Pump Down means collecting all refrigerant into the outdoor unit without the loss of refrigerant.

Be sure to perform Pump Down procedure in the cooling mode.

Pump Down Procedure

1. Connect a low-pressure gauge manifold hose to the charge port on the gas side service valve.

2. Open the gas side service valve halfway and purge the air in the manifold hose using the
refrigerant.

3. Close the liquid side service valve(all the way).

4. Turn on the unit's operating switch and start the cooling operation.

5. When the low-pressure gauge reading becomes 1 to 0.5kg/cm

2

G(14.2 to 7.1 P.S.I.G.), fully close
the gas side valve and then quickly turn off the unit. Now Pump Down procedure is completed,
and all refrigerant is collected into the outdoor unit.

30 Room Air Conditioner

Installation

Installation guide at the seaside

1.

Air conditioners should not be installed in areas where corrosive gases, such as acid or alkaline gas, are produced.

2. Do not install the product where it could be exposed to sea wind (salty wind) directly. It can result corrosion
on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunc­tion or inefficient performance.

3. If outdoor unit is installed close to the seaside, it should avoid direct exposure to the sea wind. Otherwise it
needs additional anticorrosion treatment on the heat exchanger.

1.

If you can’t meet above guide line in the seaside installation, please contact LG Electronics for the additional anticorrosion treatment.

2. Periodic ( more than once/year ) cleaning of the dust or salt particles stuck on the heat exchanger by using water

Selecting the location(Outdoor Unit)

1) If the outdoor unit is to be installed close to the seaside, direct exposure to the sea wind should be avoided.
Install the outdoor unit on the opposite side of the sea wind direction.

2) In case, to install the outdoor unit on the seaside, set up a windbreak not to be exposed to the sea wind.

3) Select a well-drained place.

• It should be strong enough like concrete to prevent
the sea wind from the sea.

• The height and width should be more than 150% of
the outdoor unit.

• It should be keep more than 70 cm of space
between outdoor unit and the windbreak for easy
air flow.

Sea wind Sea wind

Sea wind

Windbreak

P/No.: MFL39817301