LG TRUE, LSN090CE, LSU240CE, LSN240CE, LSN180CE User Manual

website http://www.lgservice.com

LG

LG

Room Air Conditioner

SERVICE MANUAL

MODELS: LSN090CE LSU090CE

LSN120CE LSU120CE

CAUTION

•BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

•ONLY FOR AUTHORIZED SERVICE PERSONNEL.

Air Conditioner Service Manual
TABLE OF CONTENTS
Safety Precautions..........................................................................................................................................	3
Dimensions......................................................................................................................................................	9
Symbols Used in this Manual.....................................................................................................................	9
Indoor Unit..................................................................................................................................................	9
Outdoor Unit.............................................................................................................................................	11
Installation .....................................................................................................................................................	14
Selection of the Best Location..................................................................................................................	17
Piping Length and Elevation.....................................................................................................................	18
How to Fix Installation Plate .....................................................................................................................	19
Drill a Hole in the Wall ..............................................................................................................................	19
Drain hose junction...................................................................................................................................	19
Flaring work and connection of piping .......................................................................................................	20
Flaring work..............................................................................................................................................	20
Connection of Piping Indoor.....................................................................................................................	21
Connection of the Pipes-Outdoor.............................................................................................................	26
Connecting the	27
Connect the	27
Checking the drainage	29
Checking the ...................	29
Form the Piping ........................	30
AIR PURGING	31
Air purging ............................	31
Air purging with ..............	31
Test Running	34
Operation	35
Function of ......................	35
Display Function ........................	39
Self-diagnosis Function............................................................................................................................	39
Remote Control Operations......................................................................................................................	40
Disassembly ..................................................................................................................................................	41
Indoor Unit................................................................................................................................................	41
Troubleshooting Guide .................................................................................................................................	44
Refrigeration Cycle Diagram ....................................................................................................................	44
2-way, 3-way Valve .................................................................................................................................	45
Cycle Parts...............................................................................................................................................	51
Electronic Parts ........................................................................................................................................	52
Schematic Diagram.......................................................................................................................................	62
Electric Control Device .............................................................................................................................	62
Wiring Diagram.........................................................................................................................................	65
Components Location ..............................................................................................................................	67
Product Specifications .................................................................................................................................	72
Exploded View...............................................................................................................................................	74
Replacement Parts List ................................................................................................................................	78

2 Room Air Conditioner

Safety Precautions

Safety Precautions

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

■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications.

This symbol indicates the possibility of death or serious injury.

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

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

Be sure not to do.

Be sure to follow the instruction.

■ Installation

Do not use damaged	the power plug and
cords, plugs, or a	the ground terminal.

• There is risk of fire	of electric shock.
shock.

Install the panel and the cover of control box securely.

Do not modify or extend the power cord.

Do not install, remove, or reinstall the unit by yourself (customer).

•There is risk of fire or electric shock.

•There is risk of fire or electric shock.

•There is risk of fire, electric shock, explosion or injury.

Service Manual 3

Safety Precautions

Be cautious when unpacking	For installation, always contact
and installing the product.	the dealer or an Authorized
	Service Center.

Do not install the product on a defective installation stand.

•Shape edges could cause injury.

Be especially careful of the sharp edges.

•There is risk of fire, electric shock, explosion, or injury.

•It may cause injury, accident, or damage to the product.

Be sure the installation area does not deteriorate with age.

•If the base collapses, ditioner could fall with property damage, and personal injury.

Install the indoor unit on the wall where the height from the floors more then 8ft(2.4m)

Do not handle the pipe by yourself(customer)

refrigent may injury.

■ Operation

Use a dedicated outlet for this appliance.

•There is risk of fire or electric shock.

Grasp the plug to remove the	Do not allow water to run into
cord from the outlet. Do not	electric part.
touch it with wet hands.
• There is risk of fire or electric	• There is risk of fire, failure of the
shock.	product, and/or electric shock.

4 Room Air Conditioner

Safety Precautions

Do not place a heater or other appliances near the power cable.

•There is risk of fire, failure of the product, and/or electric shock.

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 furnishings.

Do not store of use flammable gas or combustibles near the air conditioner.

•There is risk of fire or product failure.

Do not use the product in a tightly closed space for a long time.

•Oxygen deficiency

•Some ventilation by dow is necessary for

Stop operation and close any window in storm or hurricane. before the hurricane arrives.

•There is risk of property damage, failure of product, or electric shock.

When flammable gas leaks, turn off the gas and open a window for ventilation before turning the product on.

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.

Wax	Thinner

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

of fireproduct failure shock.

When the product is soaked (flooded or submerged), contact an Authorized Service Center.

• There is risk of electrical shock.

Service Manual 5

Safety Precautions

Ventilate the product from time to time when operating it together with a stove, etc.

Unplug the appliance before performing cleaning or maintenance.

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 fire or electrical shock.

• There is risk of electric shock.

•There is risk of product damage or failure, or unintended operation.

Take care to ensure
	for gas(refriger-
could step on or fall	after installation or
outdoor unit.	product.
• There could result in	levels may cause
injury and product	.

Install the drain hose to ensure that water is drained away properly.

Keep level even when installing the product.

Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods.

•A bad connection may cause water leakage.

•To avoid vibration or water leakage.

•It may cause a problem for your neighbors.

90˚

6 Room Air Conditioner

Safety Precautions

Use two or more people to lift and transport the air conditioner

• Avoid personal injury.

Do not use the product purposes, such as foods, works of art, consumer air conditioner, precision refrigeration

•There is risk of damage property.

Do not touch the metal parts of the product when removing the air filter. They are very sharp!

• There is risk of personal injury.

	■ Operation
Do not install the product where	Do not direct airflow at room
it will be exposed to sea wind	occupants.
(salt spray) directly.
• It may cause corrosion in the	• This could damage your health.
product. Corrosion, particularly
on the condenser and evaporator
fins, could cause product mal-
function or inefficient operation.

cloth to clean. harsh detergents,

.

of fire, electric shock to the plastic parts of

.

Do not step on or put anything	Always insert the filter securely.
on the product. (outdoor unit)	Clean the filter every two weeks
	or more often if necessary.
• There is risk of personal injury	• A dirty filter reduces the efficien-
and failure of product.	cy of the air conditioner and

Service Manual 7

Dimensions

Do not drink the water drained from the unit.

Use a firm stool or ladder when cleaning or maintaining the air conditioner.

Replace all the batteries in the remote.

•It is not sanitary and could cause serious health issues.

•Be careful and avoid personal injury.

• There is risk of fire or explosion.

■ Disuse

Do not recharge or disassemble the batteries. Do not dispose of batteries

• They may burn or

If the liquid from the batteries gets onto your skin clean water. Do not

have leaked.

cause burns or

8 Room Air Conditioner

Dimensions

Dimensions

SymbolsUsedin 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.

IndoorUnit

H

Installation plate

	Model	9	Btu Series	9 Btu Series	12 Btu Series
Dimension			(C/O)	(H/P)
W	mm(inch)		840(33.1)	894(35.2)	894(35.2)
H	mm(inch)		270(10.6)	295(11.6)	295(11.6)
D	mm(inch)		153(6.0)	165(6.5)	165(6.5)

Service Manual 9

Dimensions

H

D

W

	Model	18 Btu Series	24 Btu Series
Dimension
W	mm(inch)	1090(42.9)	1090(42.9)
H	mm(inch)	300(11.8)	300(11.8)
D	mm(inch)	178(7.0)	178(7.0)

10 Room Air Conditioner

Dimensions

OutdoorUnit

1. 9k, 12k

	W	L2
L1	D
	L3

H

L4

Liquid side (2-way valve)

		MODEL	9k, 12k
	DIM	unit
	W	mm(inch)	770(30.3)
	H	mm(inch)	540(21.3)
	D	mm(inch)	245(9.6)
	L1	mm(inch)	287(11.3)
	L2	mm(inch)	64(2.5)
	L3	mm(inch)	518(20.4)
	L4	mm(inch)	10(0.4)
	L5	mm(inch)	100(3.9)

Service Manual 11

Dimensions

2. 18k, 24k

W

D

L1

L2

L3

H

L4	L6

		MODEL	18k, 24k
	DIM
	W	mm(inch)	870(34.3)
	H	mm(inch)	655(25.8)
	D	mm(inch)	320(12.6)
	L1	mm(inch)	370(14.6)
	L2	mm(inch)	25(1.0)
	L3	mm(inch)	630(24.8)
	L4	mm(inch)	25(1.0)
	L5	mm(inch)	546(21.5)
	L6	mm(inch)	162(6.4)
	L7	mm(inch)	162(6.4)
	L8	mm(inch)	54(2.1)
	L9	mm(inch)	74.5(2.9)
	L10	mm(inch)	79(3.1)

12 Room Air Conditioner

Introduction

Introduction

SymbolsUsedIn ThisManual

This symbol alerts you to the risk of electric shock.

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

NOTICE This symbol indicates special notes.

Features

	Air Intake Vents
		Connecting
Connecting		Wires
Wires
Air Intake
Vents
Piping		Piping
Air Outlet		Drain Hose
Vents
Drain Hose
	Air Outlet Vents	Base Plate
Base Plate

Service Manual 13

Installation

Installation

Read carefully, and then follow step by step.

Installation Parts

Installation plate

Type "A" screw and plastic anchor

Type "B" screw

Remote Control Holder

Installation

Figure

Name

Ohmmeter

		wrench
	Measuring Tape, Knife	Ammeter
	Hole Core Drill	Gas Leak Detector
	Spanner	Thermometer,
		Level
	Torque wrench	Flaring Tool Set

14 Room Air Conditioner

Installation

InstallationMap

NOTICE

Installation parts you should purchase.

Air

Installation Plate

Sleeve

Bushing-Sleeve

Putty(Gum Type Sealer)

Bend the pipe as closely

on the wall as possible,

that it

.

carrying out a

.

the drainage the air filters

into the heat

	Air Inlet Vents	Gas side piping
		Liquid side piping
	Air Outlet Vents	Additional drain pipe
		Drain Hose
		Connecting cable
		Base Plate

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

Service Manual 15

ConfirmTheRefrigerant

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

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

NOTICE

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

Example
20
0
R-410A	100%	70%	50%	30%	0%
R-22	0%	30%	50%	70%	100%

4)High pressure.

-1.6 times higher than R-22.

-High Pressure refrigerant may cause personal injury.

	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

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.

16 Room Air Conditioner

SelectTheBest Location

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 space around the left and right of the unit is more than 30cm(11.8in). The unit should be installed as high on the wall as possible, allowing a minimum of 12cm(4.7in) from ceiling.

Install the indoor unit

A minimum pipe run

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

More than 30cm(11.8in)

More than 30cm(11.8in)

More than

.

noise.

Outdoor unit

1.If an awning is built direct sunlight or heat radiation from restricted.

2.Ensure that the sides is more than unit should have space.

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

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

warm air and noise not disturb neigh-

6in)

More than More than

10cm(3.9in)

10cm(3.9in)

	More than	More than
	70cm(27.6in)
		60cm(23.6in)

Rooftop Installations

If the outdoor unit is installed on a roof structure, be sure to level the unit. Ensure the roof structure and anchoring method are adequate for the unit location. Consult local codes regarding rooftop mounting.

If the outdoor unit is installed on roof structures or walls, this may result in excessive noise and vibration, and may be also classed as non serviceable installation.

Service Manual 17

PipingLengthAndElevation

	Capacity	Pipe Size		Standard	Max.	Max.	Additional Refrigerant
				Length	Elevation	length
	(Btu/h)	Suction	Evap				g/m(oz/ft)
				m(ft)	B m(ft)	A m(ft)
	9k(C/O)	3/8"	1/4"	7.5(25)	7.5(25)	15(49)	20(0.22)
	9k(H/P), 12k	1/2"	1/4"	7.5(25)	7.5(25)	15(49)	20(0.22)
	18k(C/O)	1/2"	1/4"	7.5(25)	15(49)	30(98)	20(0.22)
	18k(H/P), 24k	5/8"	1/4"	7.5(25)	15(49)	30(98)	30(0.32)

Outdoor unit

	A
Indoor unit	B

Outdoor unit

Oil trap

Indoor

B

.4ft)

• Capacity is based on		reliability.
• Oil trap should be

18 Room Air Conditioner

How To Mount Installation Plate

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.

Chassis

Hook

Type “A”

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.

	CHASSIS		Distance (mm)
	(Grade)	A
	S4	50
	SE	65	plate
	S5	95		B
				A
				Ø70mm
				Right rear piping

DrillaHole

•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.

	WALL
Indoor	Outdoor

5-7mm

(0.2~0.3")

Service Manual 19

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.

Copper		Slanted Uneven Rough
pipe	90°

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

ping burrs into the

Putting nut on

•Remove flare nuts then put them on removal.

(not possible to put

Flaring work

• Carry out flaring work using flaring tool as shown below.

Outside diameter			A
mm	inch	mm		inch
Ø6.35	1/4	0~0.5		0~0.020
Ø9.52	3/8	0~0.5		0~0.020
Ø12.7	1/2	0~0.5		0~0.020
Ø15.88	5/8	0~1.0		0~0.039

Pipe

Reamer

nut

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

		"A"	Handle
	Bar		Bar
			Yoke
			Cone

Copper pipe

Clamp handle

Red arrow mark

20 Room Air Conditioner

ConnectingThePiping

Indoor

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

2.Remove the plastic tubing retainer(see the illus-

tration 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.

For left rear piping

Route the indoor tubing and the drain hose in the direction

Insert the connecting from the outdoor unit

•Do not connect the

•Make a small loop nection later.

Tape the tubing, drain cable. Be sure that lowest side of the side can cause drain unit.

2

Connecting

cable

Drain pipe

NOTICE

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.

Indoor unit installation

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

Indoor unit

Spacer

Installation plate 8cm

Service Manual 21

Plastic bands

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

•Put a couple drops of refrigerant oil on the face of the flare before assembling taking care not to add any contaminants.

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

Wrap the insulation material around the connecting portion.

•Overlap the connection pipe insulation material and the indoor unit pipe insulation material. Bind them together with vinyl tape so that there is no

gap.

Insulation material

Indoor unit tubing

Flare nut Pipings

• Tighten the flare nut with a wrench.

Indoor unit tubing

Torque wrench Connection pipe

Flare nut

Spanner (fixed)

Outside diameter

mm

Ø6.35

Ø9.52

Ø12.7

Ø15.88

•Mount the clamp on screw.(SE-H/P: 9k, 12k

Type "B" screw	Drain hose
Clamp
Boss

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

Drain pipe

Indoor unit drain hose

Adhesive Vinyl tape(narrow)

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

	Connection	Indoor
		unit pipe
	pipe
		vinyl tape

hose together by over the range

rear piping housing

Wrap with vinyl tape

Pipe

Vinyl tape(wide)

Drain hose

For right rear piping

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

Drain hose

22 Room Air Conditioner

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.

Tape the drain hose and the connecting cable.

• Connecting

Tape

Connecting pipe

Drain hose

Connecting cable

Indoor unit installation

•Hook the indoor unit the installation plate the rear top and rear the upper edge and plate.) Ensure that on the installation right.

Drain hose

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

•Put a couple drops of refrigerant oil on the face of the flare before assembling taking care not to add any contaminants

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

Indoor unit tubing

Flare nut Pipings

• Tighten the flare nut with a wrench.

		Spanner (fixed)
		Flare nut
Torque wrench		Connection pipe
Indoor unit tubing
Outside diameter		Torque
Ø6.35	1/4	1.8
Ø9.52	3/8	4.2
Ø12.7	1/2	5.5
Ø15.88	5/8	6.6

•Mount the clamp on the boss with a type "B" screw.(SE-H/P: 9k, 12k C/O: 12k)

Type "B" screw	Drain hose
Clamp

hose at the indoor

Indoor unit drain hose

Adhesive Vinyl tape (narrow)

Wrap the insulation material around the connecting portion.

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

Plastic bands Insulation material

Service Manual 23

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

	Connection	Indoor
		unit piping
	pipe
	Vinyl tape	Wrap with vinyl tape
	(wide)

Pipe

Vinyl tape(narrow)

Connecting cable

•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.

Drain hose

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

Piping passage piping hole

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

Connecting

cable

Drain hose

24 Room Air Conditioner

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

Correct case

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

Incorrect case

• Following bending

Service Manual 25