LG S18AN, AS-W126RGH1, AS-W186TGH1 Schematic

LG

Room

Air Conditioner

SERVICE MANUAL

LG

MODELS: AS-W096QGG1

AS-W126RGH1
AS-W186TGH1
AS-W246TGH1
AS-W246TLG1

CAUTION

website http://www.lgservice.com

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

• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

2 Room Air Conditioner

Air Conditioner Service Manual

TABLE OF CONTENTS

LG Model Name...............................................................................................................................................3

Safety Precautions..........................................................................................................................................5

Dimensions .....................................................................................................................................................9

Symbols Used in this Manual.....................................................................................................................9

Indoor Unit..................................................................................................................................................9

Outdoor Unit.............................................................................................................................................10

Product Specifications ................................................................................................................................12

Installation.....................................................................................................................................................14

Select the Best Location .........................................................................................................................14

Piping Length and Elevation.....................................................................................................................14

How to Fix Installation Plate.....................................................................................................................15

Drill a Hole in the Wall..............................................................................................................................15

Installation Instructions of Telephone Control(Optional)...........................................................................15

Flaring Work.............................................................................................................................................16

Connection of Piping Indoor.....................................................................................................................17

Connection of the Pipes-Outdoor.............................................................................................................20

Connect the Cable to the Indoor Unit.......................................................................................................21

Connect the Cable to the Outdoor Unit....................................................................................................22

Checking the Drainage.............................................................................................................................23

Form the Piping........................................................................................................................................23

Air Purging ...............................................................................................................................................24

Air Purging with Vacuum Pump................................................................................................................24

Test Running............................................................................................................................................26

Functions ......................................................................................................................................................27

Operation ......................................................................................................................................................30

Disassembly..................................................................................................................................................45

Indoor Unit................................................................................................................................................45

Schematic Diagram.......................................................................................................................................48

Electric Control device..............................................................................................................................48

Wiring Diagram.........................................................................................................................................51

Components Location ..............................................................................................................................53

Troubleshooting Guide.................................................................................................................................57

Refrigeration Cycle Diagram....................................................................................................................57

Pipe Length and the Elevation .................................................................................................................58

2-way, 3-way Valve...................................................................................................................................59

Cycle Parts...............................................................................................................................................66

Self-diagnosis Function............................................................................................................................67

Electronic Parts........................................................................................................................................69

Exploded View ..............................................................................................................................................80

Indoor Unit................................................................................................................................................80

Outdoor Unit.............................................................................................................................................81

Replacement Parts List ................................................................................................................................82

Indoor.......................................................................................................................................................82

Outdoor ....................................................................................................................................................83

Service Manual 3

LG Model Name

12 - 345678910

Code Type Code of Model Meaning

1 Producing Center, A~Z L: Chang-won R22 N: India

Refrigerant A: Chang-won R410A Z: Brazil

C: Chang-won R407C D: Indonesia
T: China
U: China R410A

X: Mexico
K: Turkey R22

V: Vietnam

E: Turkey R410A

S: Out Sourcing

H: Thailand
2 Product Type A~Z S: Split Type Air Conditioner
3 Cooling/Heating/Inverter A~Z C: Cooling only

H: Heat pump
X: C/O + E/Heater
Z: H/P + E/Heater

V: AC Inverter C/O

N: AC Inverter H/P

Q: DC Inverter C/O

W: DC Inverter H/P

4, 5 Capacity 0~9 Cooling/Heating Capacity

Ex. "09" → 9,000 Btu/h

6 Electric Range 1~9 1: 115V/60Hz, A: 220V, 50Hz, 3Phase

A~Z 2: 220V/60Hz B: 208~230V, 60Hz, 3Phase

3: 208-230V/60Hz C: 575V, 50Hz, 3Phase
5: 200-220V/50Hz D: 440~460, 60Hz, 3Phase
6: 220-240V/50Hz E: 265V, 60Hz
7: 110V, 50/60Hz F: 200V, 50/60Hz
8: 380-415V/50Hz
9: 380-415V/60Hz

7 Chassis A~Z Name of Chassis of Unit

Ex. LSP → SP Chassi

s

8 Look A~Z Look,

Color (Artcool Model)

9 Function A~Z

10 Serial No. 1~9 LG Model Development Serial No.

* ARTCOOL COLOR

Basic A
Basic+4Way B
Plasma Filter C
Plasma Filter+4 Way D
Tele+LCD E
Tele+LCD+Nano plasma+4Way F
Nano Plasma F+(A/changeove)+A/clean+Low A G
Nano Plasma F+(A/changeove)+A/clean+4way+Low A H
Tele+LED+4way I
Internet J
Plasma F+4Way+Oxy generator K
Nano Plasma F+(A/changeove)+A/clean L
Nano Plasma F+(A/changeove)+A/clean+4way M
Nano Plasma F+(A/changeove)+A/clean+PTC N
Nano Plasma F+(A/changeove)+Autoclean+4way+PTC P
Nano Plasma F+(A/changeove)+A/clean+4way+Low A+PTC Q
Negative ION+A/Clean R
(Nano)Plasma+Negative ION+A/Clean S
4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean

T
Nano Plasma F+4Way+(A/changeove)+A/clean+Oxy generator U
4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean+Oxy generator

V
Dry Contact W
Wired Remocon 8

R Mirror
W White
B Blue
D Wood
M Metal
C Cherry

N Walnut
A Gogh
S Sisley
Q Quran
K Mecca

CHASSIS Look

D
K
L
G
M
N
D
P

Division
Panel Type(Deluxe)
Fighting 'Look'
(LG1)
(LG2)-SEMI PANEL
OEM1
OEM2
Panel Type(Deluxe)
LG3

S4/S5

S6
SQ
SR
ST

2003~

4 Room Air Conditioner

12 -345678910

Code Type Code of Model Meaning

1 Producing Center, A~Z L: Chang-won R22 N: India

Refrigerant A: Chang-won R410A Z: Brazil

C: Chang-won R407C D: Indonesia
T: China M: Mexico
K: Turkey R22 V: Vietnam
E: Turkey R410A S: Out Sourcing

H: Thailand
2 Product Type A~Z S: Split Type Air Conditioner
3 Cooling/Heating/Inverter A~Z C: Cooling only

H: Heat pump

X: C/O + E/Heater

Z: H/P + E/Heater

V: AC Inverter C/O
N: AC Inverter H/P
Q: DC Inverter C/O
W: DC Inverter H/P

4, 5 Capacity 0~9 Cooling/Heating Capacity

Ex. "09" → 9,000 Btu/h
6 Electric Range 1~9 1: 115V/60Hz, A: 220V, 50Hz, 3Phase

A~Z 2: 220V/60Hz B: 208~230V, 60Hz, 3Phase

3: 208-230V/60Hz C: 575V, 50Hz, 3Phase

5: 200-220V/50Hz D: 440~460, 60Hz, 3Phase

6: 220-240V/50Hz E: 265V, 60Hz

7: 110V, 50/60Hz F: 200V, 50/60Hz

8: 380-415V/50Hz

9: 380-415V/60Hz
7 Chassis A~Z Name of Chassis of Unit

Ex. LSP → SP Chassis
8 Look A~Z Look,

Color (Artcool Model)
9 Function A~Z

10 Serial No. 1~9 LG Model De

* ARTCOOL COLOR

velopment Serial No.

Basic A
Basic+4Way B
Plasma Filter C
Plasma Filter+4 Way D
Tele+LCD E
Tele+LCD+Nano plasma+4Way F
Nano Plasma F+(A/changeove)+A/clean+Low A G
Nano Plasma F+(A/changeove)+A/clean+4way+Low A H
Tele+LED+4way I
Internet J
Plasma F+4Way+Oxy generator K
Nano Plasma F+(A/changeove)+A/clean L
Nano Plasma F+(A/changeove)+A/clean+4way M
Nano Plasma F+(A/changeove)+A/clean+PTC N
Nano Plasma F+(A/changeove)+Autoclean+4way+PTC P
Nano Plasma F+(A/changeove)+A/clean+4way+Low A+PTC Q
Negative ION+A/Clean R
(Nano)Plasma+Negative ION+A/Clean S
4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean

T

Nano Plasma F+4Way+(A/changeove)+A/clean+ U

R Mirror
W White
B Blue
D Wood
M Metal
C Cherry

2003

Service Manual 5

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.

■ Meanings of 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.

Be sure not to do.

Be sure to follow the instruction.

Do not use damaged power
cords, plugs, or a loose socket.

• There is risk of fire or electric

shock.

Always use the power plug
and socket with the ground
terminal.

• There is risk of electric shock.

Install the panel and the cover
of control box securely.

• There is risk of fire or electric
shock.

■ Installation

Do not modify or extend the
power cord.

• There is risk of fire or electric
shock.

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

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

Be cautious when unpacking
and installing the product.

• Shape edges could cause injury.
Be especially careful of the sharp
edges.

6 Room Air Conditioner

Safety Precautions

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 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.

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.

■ Operation

Do not turn the air-conditioner
ON or OFF by plugging or
unplugging the power plug.

• There is risk of fire or electric
shock.

Use a dedicated outlet for this
appliance.

• There is risk of fire or electric
shock.

Grasp the plug to remove the
cord from the outlet. Do not
touch it with wet hands.

• There is risk of fire or electric
shock.

Service Manual 7

Safety Precautions

■ Installation

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

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

Be cautious that water could
not enter the product.

• There is risk of fire, electrical shock
or product damage.

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 allow water to run into
electric part.

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

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

• There is risk of fire or failure of
product.

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.

Thinner

Wax

90˚

Safety Precautions

8 Room Air Conditioner

■ Operation

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

• Avoid personal injury.

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 anything
on the product. (outdoor unit)

• There is risk of personal injury and
failure of product.

Do not insert hands or other
objects through the air inlet or
outlet while the air conditioner
is plugged in.

• There are sharp and moving parts
that could cause personal injury.

Service Manual 9

Dimensions

Dimensions

Installation plate

D

H

W

W mm 824 900 1090

H mm 260 285 314
D mm 155 156 172

Model

Dimension

AS-W096QGG1 AS-W126RGH1

AS-W186TGH1
AS-W246TGH1

Indoor Unit

This symbol alerts you to the risk of electric shock.
This symbol alerts you to hazards that could cause harm to the

air conditioner.

This symbol indicates special notes.

NOTICE

Symbols Used in this Manual

10 Room Air Conditioner

Outdoor Unit

Dimensions

W

L2

L3

L1

D

H

L4

L5

Gas side
(3-way valve)

Liquid side
(2-way valve)

MODEL

DIM unit

W mm 770

H mm 540

D mm 245
L1 mm 285
L2 mm 65
L3 mm 518
L4 mm 10
L5 mm 100

AS-W096QGG1
AS-W126RGH1

Service Manual 11

Dimensions

Outdoor Unit

W

L7 L6 L8 L9

D

L1

L2

L3

L10

L4L5

H

Gas side

Liquid side

AS-W186TGH1
AS-W246TGH1
AS-W246TLG1

W mm 870

H mm 655

D mm 320
L1 mm 370
L2 mm 340
L3 mm 25
L4 mm 630
L5 mm 25
L6 mm 546
L7 mm 162
L8 mm 162
L9 mm 54

L10 mm 74.5

MODEL

DIM

12 Room Air Conditioner

Product Specifications

Table-1

Model Name

Item Unit

W

MIN kcal/h.(W)

Btu/h.

W

Cooling Capacity Type kcal/h.(W)

Btu/h.

W

Max kcal/h.(W)

Btu/h.

W

MIN kcal/h.(W)

Btu/h.

W

Heating Capacity Type kcal/h.(W)

Btu/h.

W

Max kcal/h.(W)

Btu/h.

IN:20°C,Out: -10°C(Heater ON)

Btu/h.

IN:20°C,Out: -10°C(Heater OFF)

Btu/h.

Power Input Cooling W

Heating W
Heating(-10°C,Heater ON)

W

Heating(-10°C,Heater OFF)

W

Running Current Cooling A

Heating A
Heating(-10°C,Heater ON)

A

Heating(-10°C,Heater OFF)

A

Starting Current Cooling A

Heating A

EER Cooling W/W

Btu/h.W
COP Heating W/W
Power Supply Ø,V,Hz
Power Factor %
Air Circulation Indoor,Max m3/min(CFM)

Outdoor,Max m3/min(CFM)
Moisture Removal l/h.(pts/h.)
Noise Level Indoor,High dB(A)±3
(Sound Med. dB(A)±3
Pressure,1m) Low dB(A)±3

Outdoor,Max dB(A)±3
Refrigerant(R410A)Charge g
Power Cord AWG#:P*mm

2

Connecting Cable AWG#:P*mm

2

Connecting Tube Liquid Side mm(in)
(Ø. Socket Flare) Gas Side mm(in)

Length,std m(in)
Drain Hose (O.D , I.D) mm(in)

Indoor mm
Dimension inch
(W*H*D) Outdoor mm

inch

Net Weight Indoor kg(lbs)

Outdoor kg(lbs)

AS-W096QGG1 AS-W126RGH1 AS-W186TGH1 AS-W246TGH1

Product Specifications

1,582 2,110 1,758 4,249
1,361 1,814 1,512 3,654
5,400 7,200 6,000 14,500
2,640 3,520 5,280 7,032
2,270 3,027 4,540 6,048
9,010 12,014 18,016 24,000
2,901 3,868 5,801 7,735
2,495 3,326 4,990 6,653
9,900 13,200 19,800 26,400
1,978 2,532 1,406 3,604
1,701 2,177 1,210 3,100
6,750 8,640 4,800 12,300
3,170 3,960 6,070 7,735
2,726 3,405 5,219 6,653

10,819 13,512 20,711 26,400

3,481 4,351 6,651 8,497
2,994 3,742 5,720 7,308

11,880 14,850 22,700 29,000

----

----

950 1,200 1,630 2,480

1,150 1,300 1,900 2,730

----

----

4.3 5.4 7.5 11.5

5.1 5.7 8.6 12.5

----

----

4.3 5.4 7.5 11.5

5.1 5.7 8.6 12.5

2.78 2.93 3.24 2.84

9.48 10.01 11.06 9.68

2.76 3.05 3.19 2.83

1,220-240,50 1,220-240,50 1,220-240,50 1,220-240,50

97 97 97 97

7.2(254) 8.70(307) 13.0(459) 16.0(565)
26(918) 26(918) 42(1483) 45(1589)

1.4(2.94) 1.5(3.2) 2.12(4.48) 2.90(6.13)
35 40 42 47
32 37 39 43
29 31 36 39
48 48 55 58

610 810 1180 1500
16:3*1.0 16:3*1.5 12:3*2.5 12:3*2.5
16:4*1.0 16:4*1.5 12:4*2.5 12:4*2.5

6.35(1/4) 6.35(1/4) 6.35(1/4) 9.52(3/8)

9.52(3/8) 12.7(1/2) 12.7(1/2) 15.88(5/8)

7.5(295) 7.5(295) 7.5(295) 7.5(295)

21.5,16.0(0.85,0.63) 21.5,16.0(0.85,0.63) 21.5,16(0.85,0.63) 21.5,16(0.85,0.63)
824*260*155 900*285*156 1090*314*172 1090*314*172

32.4*10.2*6.1 35.1*11.1*6.2 42.9*12.4*6.8 42.9*12.4*6.8
770*540*245 770*540*245 870*655*320 870*655*320

30.3*21.3*9.6 30.3*21.3*9.6 34.3*25.8*12.6 34.3*25.8*12.6

7.0(15.4) 9.5(20.9) 12(26.5) 12(26.5)
34(74.8) 38(83.8) 60(132.3) 65(143.3)

Service Manual 13

Product Specifications

Table-2

Model Name

Item Unit

W

MIN kcal/h.(W)

Btu/h.

W

Cooling Capacity Type kcal/h.(W)

Btu/h.

W

Max kcal/h.(W)

Btu/h.

W

MIN kcal/h.(W)

Btu/h.

W

Heating Capacity Type kcal/h.(W)

Btu/h.

W

Max kcal/h.(W)

Btu/h.

IN:20°C,Out: -10°C(Heater ON)

Btu/h.

IN:20°C,Out: -10°C(Heater OFF)

Btu/h.

Power Input Cooling W

Heating W
Heating(-10°C,Heater ON)

W

Heating(-10°C,Heater OFF)

W

Running Current Cooling A

Heating A
Heating(-10°C,Heater ON)

A

Heating(-10°C,Heater OFF)

A

Starting Current Cooling A

Heating A

EER Cooling W/W

Btu/h.W
COP Heating W/W
Power Supply Ø,V,Hz
Power Factor %
Air Circulation Indoor,Max m3/min(CFM)

Outdoor,Max m3/min(CFM)
Moisture Removal l/h.(pts/h.)
Noise Level Indoor,High dB(A)±3
(Sound Med. dB(A)±3
Pressure,1m) Low dB(A)±3

Outdoor,Max dB(A)±3
Refrigerant(R410A)Charge g
Power Cord AWG#:P*mm

2

Connecting Cable AWG#:P*mm

2

Connecting Tube Liquid Side mm(in)
(Ø. Socket Flare) Gas Side mm(in)

Length,std m(in)
Drain Hose (O.D , I.D) mm(in)

Indoor mm
Dimension inch
(W*H*D) Outdoor mm

inch

Net Weight Indoor kg(lbs)

Outdoor kg(lbs)

AS-W246TLG1

4249
3654

14500

7032
6048

24000

7735
6653

26400

3604
3100

12300

7735
6653

26400

8497
7308

29000

-

­2320
2400

-

-

11.5

12.5

-

-

11.5

12.5

2.61

10.34

3.22

1,220-240,50

97

16.0(565)
42(1589)

2.9
45

­37
56

1500
12:3*2.5
12:4*2.5

9.52(3/8)

15.88(5/8)

7.5(295)

21.5,16(0.85,0.63)
1090*314*172

42.9*12.4*6.8
870*655*320

34.3*25.8*12.6
12(26.5)

60(132.3)

14 Room Air Conditioner

Installation

Installation

Indoor unit

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

• Select a place where there are no obstacles in

front of the unit.

• Make sure that condensation drainage can be con­veniently routed away.
Do not install near a doorway.

• Ensure that the space around the left and right of
the unit is more than "A". The unit should be
installed as high on the wall as possible, allowing a
minimum of "B" from ceiling.

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

Outdoor unit

• 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.

• Ensure that the space around the back and sides
is more than 10cm. The front of the unit should
have more than 70cm of space.

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

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

• Select a place so that the warm air and noise from
the air conditioner do not disturb neighbors.

More than "A"

More than B

More than 2.3m

More than "B"

More than 10cm More than 10cm

More
than 60cm

More than 60cm

More than 70cm

CAUTION: Install the indoor unit on the wall

where the height from the floors more than 2.3
meters.

CAUTION:

•

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.

Grade

Clearance(cm)

AB

7K~28K 10 5

30K~38K 30 12

Pipe Size

Capacit

y

(Btu/h)

GAS LIQUID

Max.

Length

A (m)

Additional

Refrigerant

(g/m)

Max.

Elevation

B (m)

Standard

Length

(m)

7k~14k

3/8"(Ø9.52) 1/4"(Ø6.35) 4 or 7.5 7 15 20
1/2"(Ø12.7) 1/4"(Ø6.35) 4 or 7.5 7 15 20
1/2"(Ø12.7) 1/4"(Ø6.35) 4 or 7.5 15 30 20

18k~28k 5/8"(Ø15.88) 1/4"(Ø6.35) 4 or 7.5 15 30 20

5/8"(Ø15.88) 3/8"(Ø9.52) 4 or 7.5 15 30 30

30k~38k

5/8"(Ø15.88) 3/8"(Ø9.52) 7.5 15 30 30
3/4"(Ø19.05) 3/8"(Ø9.52) 7.5 15 30 50

If case more than 5m

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

A

Oil trap

Outdoor unit

Indoor unit

B

I

Selection of the Best Location

Piping Length and Elevation

Service Manual 15

Installation

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

1. Mount the installation plate on the wall with four
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.

• Drill the piping hole with a ø70mm hole core drill.
Drill the piping hole at either the right or the left
with the hole slightly slanted to the outdoor side.

• Open the Front Grille.

• Pass Telephone Control Cord Wire through the

hole which the power cord goes through.

• Connect Telephone Control Cord Wire to the
phone jack of telephone PCB of Control Box.

• Fix Telephone Control Cord Wire inside Control
box so as not to disconnect.

• Close the Front Grille.

Installation Plate

Type "A" screw

5-7mm

(3/16"~5/16")

Indoor

WALL

Outdoor

Answering telephone / Normal telephone

(Not packed in the box)

Adaptor

(Not packed in

the box)

Telephone Control

Cord Wire

(Packed in the box)

Phone
Conductor

Installation plate

Ø70mm

Left rear piping Right rear piping

C

D

B

A

Ø70mm

Ø70mm

Left rear piping

Right rear piping

CE A

B

D

Installation plateInstallation plate

ABCD

SJ 90 20 80 20

SL, SK 45 40 80 20

SQ 75 12 80 12
SR 0 40 20 40
ST 105 0 210 0

CHASSIS

(Grade)

Distance (mm)

How to Fix Installation Plate Drill a Hole in the Wall

Installation Instructions of Telephone Control(Optional)

ABCDE
SM 180 115 - 115 50
SN 180 115 195 115 -

CHASSIS

(Grade)

Distance (mm)

16 Room Air Conditioner

Installation

Flaring Work

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

Cut the pipes and the cable.

• Use the piping kit accessory or pipes purchased
locally.

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

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

• Cut the cable 1.5m longer than the pipe length.

Burr removal

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

• 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

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

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

Check

• Compare the flared work with figure below.

• If flare is noted to be defective, cut off the flared

section and re-flare it.

Copper

pipe

90°

Slanted Uneven Rough

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Inclined

Inside is shiny without scratches

Smooth all round

Even length

all round

Surface

damaged

Cracked Uneven

thickness

= Improper flaring =

Pipe

Reamer

Point down

Flare nut

Copper tube

mm inch mm

Ø6.35 1/4 0~0.5
Ø9.52 3.8 0~0.5

Ø12.7 1/2 0~0.5
Ø15.88 5/8 0~1.0
Ø19.05 3/4 1.0~1.3

Outside diameter A

Service Manual 17

Installation

Connection of Piping Indoor

• Preparing the indoor unit's piping and drain hose
for installation through the wall.

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

• Replace the plastic tubing holder in the original
position.

For right rear piping

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
upper 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 recom-

mended.

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).

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

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

NOTICE

CAUTION:

When
install, make sure
that the remaining

parts must be removed
clearly so as not to dam­age the piping and drain
hose, especially power
cord and connecting cable.

Tubing holder

Connecting
cable

Loop

Gas side
piping

Liquid side
piping

Drain hose

Drain hose

Connecting

cable

Indoor unit tubing Flare nut Pipes

Drain hose

18 Room Air Conditioner

Installation

• Tighten the flare nut with a wrench.

• When extending the drain hose at the indoor unit,

install the drain pipe.

5. 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.

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

• 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.

For left rear piping

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.

mm inch kg.m

Ø6.35 1/4 1.8
Ø9.52 3.8 4.2

Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Ø19.05 3/4 6.6

Outside diameter Torque

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

Drain hose

Connecting

cable

Drain pipe

Connecting cable

Service Manual 19

Installation

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 connec-

tion later.

4. Tape the drain hose and the connecting cable.

• Connecting cable

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.

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

• Align the center of the pipes and sufficiently tight-

en the flare nut by hand.

• Tighten the flare nut with a wrench.

• When extending the drain hose at the indoor unit,

install the drain pipe.

7. 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.

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

mm inch kg.m

Ø6.35 1/4 1.8
Ø9.52 3.8 4.2

Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Ø19.05 3/4 6.6

Outside diameter Torque

Vinyl tape

Adhesive

Drain hose

Indoor unit drain hose

(narrow)

Plastic bands

Insulation material

Vinyl tape(narrow)

Connection
pipe

Connecting cable

Indoor
unit piping

Pipe

Vinyl tape
(wide)

Wrap with vinyl tape

Installation plate

Spacer

Indoor unit

8cm

Indoor unit tubing Flare nut Pipes

Wrench

Indoor unit tubing

Connection pipe

Flare nut

Open-end wrench (fixed)

20 Room Air Conditioner

Installation

• 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.

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

9. Set the pipings and the drain hose to the back of
the chassis with the tubing holder.

• Hook the edge of tubing holder to tap on chassis
and push the bottom of tubing holder to be
engaged at the bottom of chassis.

10. Indoor unit installation

• Remove the spacer.

• 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).

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

2. 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
Ø9.52 3/8 4.2

Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Ø19.05 3/4 6.6

Outside diameter Torque

Drain hose

Vinyl tape(narrow)

Pipe

Wrap with
vinyl tape(wide)

Piping for
passage through
piping hole

Outdoor unit

Gas side piping
(Bigger diameter)

Liquid side
piping
(Smaller
diameter)

Torque wrench

Tubing holder

Drain hose

Connecting

cable

Connection of the Pipes-Outdoor

Service Manual 21

Installation

• Connect the cable to the indoor unit by connecting the wires to the terminals on the control board in
dividually 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.

Air

Conditioner

Main power source

Circuit Breaker

Use a circuit
breaker or time
delay fuse.

CAUTION

The power connecting cable connected to
the indoor and outdoor unit should be
complied with the following specifications
(Type "B" approved by HAR or SAA).

The power cord connected to the "A" unit
should be complied with the following
specifications(Type "B" approved by HAR or
SAA).

7k, 9k 12k 18k

1.0 1.5 2.5

NORMAL CROSS

-SECTIONAL AREA

Grade

7k, 9k 12k 18k

1.0 1.5 2.5

NORMAL CROSS

-SECTIONAL AREA

Grade

(mm2)

(mm

2

)

CAUTION:

• The above circuit diagram is 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 the wiring diagram.

• When installing, refer to the circuit diagram on the
Control Box of Indoor Unit.

• When installing, refer to the wiring diagram on the
Control Cover Inside Outdoor Unit.

Connect the Cable to the Indoor Unit.

CAUTION:

If a power plug is not to be used, provide a circuit
breaker between power source and the unit as shown
below.

22 Room Air Conditioner

Installation

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

2. Secure the cable onto the control board with the
cord clamp.

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

4. Use a recognized circuit breaker "A"
between the power source and the unit.
A disconnecting device to adequately disconnect
all supply lines must be fitted.

Terminal block

Over 5mm

Cover control

Connecting cable

Connecting cable

CAUTION: After 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. (Refer to page 20))

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 func-

tion 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 in each active(phase) conductors.

Outdoor Unit

7k~14k 18k 24k~28k 30k, 32k 36k, 38k

15 20 30 30 40

Circuit

Breaker

(A)

Grade

Connect the Cable to the Outdoor Unit

Service Manual 23

Installation

Checking the Drainage Form the Piping

1. To remove the front panel from the indoor unit.

• Set the air direction louvers up-and-down to the

position(horizontally) by hand.

• Remove the securing screws that retain the front

panel. Pull the lower left and right sides of the
grille toward you and lift it off.

2. To check the drainage.

• Pour a glass of water on the evaporator.

• Ensure the water flows through the drain hose of

the indoor unit without any leakage and goes out
the drain exit.

3. Drain piping

• The drain hose should point downward for easy

drain flow.

• Do not make drain piping.

1. 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.

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

• Tape the piping, drain hose and connecting cable

from down to up.

• Secure the tapped piping along the exterior wall

using saddle or equivalent.

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

• Tape the piping and connecting cable from down

to up.

• Secure the taped piping along the exterior wall.

Form a trap to prevent water entering the room.

• Fix the piping onto the wall by saddle or equiva-

lent.

Pull the right and
the left side.

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

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

24 Room Air Conditioner

Installation

CAUTION:

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.

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

• Pressure in the system rises.

• Operating current rises.

• Cooling(or heating) efficiency drops.

• Moisture in the refrigerant circuit may freeze and

block capillary tubing.

• Water may lead to corrosion of parts in the refrig­eration system.

Therefore, the indoor unit and tubing between the
indoor and outdoor unit must be leak tested and
evacuated to remove any noncondensables and
moisture from the system.

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.

• 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.

• 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.

• 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

CAUTION:

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.

Air Purging

Air Purging with Vacuum Pump

Service Manual 25

Installation

3. Evacuation

• 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.

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

4. Finishing the job

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

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

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

• 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.

• 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.

(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 coun-

terclockwise 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 connec-

tions by a soft brush to check for leakage of the

connecting points of the piping.
(5) If bubbles come out, the pipes have leakage.

Soap water method

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)

Gas side

Liquid side

Cap

Hexagonal wrench

2-way valve

(Open)

3-way valve

(Close)

Indoor unit

Pressure
gauge

Open

Outdoor unit

Manifold valve

Lo Hi

Close

Vacuum pump

26 Room Air Conditioner

Installation

Test Running

1. Check that all tubing and wiring have been properly
connected.

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

Prepare remote control

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
control if the system is not going to be
used for a long time.

Settlement of outdoor unit

• Anchor the outdoor unit with a bolt and
nut(ø10mm) tightly and horizontally on a concrete
or rigid mount.

• 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.

• In the case when the vibration of the unit is con­veyed to the hose, secure the unit with an anti­vibration bushing.

Evaluation of the performance

Operate 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(46°F)
(Cooling) or (Heating).

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

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.

The air conditioner is now ready for use.

NOTICE

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/cm

2

G(120~135 P.S.I.G.)

Outside ambient

TEMP.

Refrigerant

The pressure of the gas side

service valve.

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

Pump Down means collecting all refrigerant in the
outdoor unit without loss in refrigerant gas.

CAUTION:

Be sure to perform Pump Down procedure with the
unit 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 from the manifold hose using the refrigerant
gas.

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

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/cm2 G(14.2 to 7.1 P.S.I.G.), fully close the
gas side valve stem and then quickly turn off the
unit. At that time, Pump Down has been completed
and all refrigerant gas will have been collected in
the outdoor unit.

PUMP DOWN

Service Manual 27

Functions

• Room temperature sensor. (Thermistor)

• Pipe temperature sensor. (Thermistor)

• Maintain the room temperature in accordance with the Setting Temp.

• Indoor fan is delayed for 5 sec at the starting.

• Restarting is for approx. 2 minutes.

• Super High, High, Med, Low

--- Lights up in operation

--- Lights up in Sleep Mode

--- Lights up in Timer Mode

--- Lights up in Preheat Mode (for Heating Model)

--- Lights up in Plasma Air Clean Mode

• Intermittent Operation of fan at low speed or off.

• The fan is switched to low(Cooling), low(Heating) speed.

• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.

• The fan is switched to intermittent or irregular operation

•

The fan speed is automatically switched from high to low speed.

• The louver can be set at the desired position or swing
up and down automatically.

Indoor Unit

Operation ON/OFF by Remote controller

Sensing the Room Temperature

Room temperature control

Starting the Current Control

Time Delay Safety Control

Indoor Fan Speed Control

Operation indication Lamps (LED)

Soft Dry Operation Mode

• Both the indoor and outdoor fan stops
during defrosting.

• The indoor fan stops until the
evaporator pipe temperature will be
reached at 34°C.

Sleep Mode Auto Control

Natural Air Control by CHAOS Logic

Airflow Direction Control

Defrost(Deice) control (Heating)

Hot-start Control (Heating)

Heater (Optional)

• The function will be operated while in any
operation mode with selecting the function.

• The function is to be stopped while it is
operating with selecting the function.

PLASMA

AUTO CLEAN(Optional)

Horizontal airflow Direction Control(Optional)

Energy-Saving control(Optional)

Auto Changeover

Functions

PLASMA

28 Room Air Conditioner

Functions

•

If power is on, it will operate to chage capacitor on controller and power relay will operate after about 2~5sec.

• If outdoor temp. is below 0°C, preheater is operating for 1~5min.

• At the initial, It will be operated compressor after 1min. for preheating.

• The active power filter is designed to correct power factor(cos θ) and to regulate DC link voltage.

• It will be operated PFC circuit when the compressor freq. is over 30Hz and wattage is over 450 watt.

• The final operating freq. of comp. is set the lowest freq. that limited outdoor temp., discharge pipe temp.,

heat-sink temp., target freq., owing to CT.

• It will be changed the drive freq. of comp. according to temp. of indoor and outdoor.

• It will be changed the drive voltage of comp. according to operating frequency.

• It is only operated in the heating operation mode except defrosting operation.

• High speed

- Although fan motor speed is middle, it will change high speed in case of below AC193V, over 45°C of
outdoor temp., and over fc, fh of comp. Freq.

• Middle speed

- Nomal mode

• Low speed

- Although fan motor speed is middle, it will change Low speed in case of over AC 270V, over 21°C
(Heating Mode) of outdoor temp. below 24°C (Cooling Mode) of outdoor temp.

It controls optimum flow of refrigerant in system.

• When the temp. of power module increases to 85°C, controller decreases Freq. of Comp.

Outdoor Unit

Power relay control

Stand by control at low temp.

Active power filter control(PSC)

Comp. Freq. control

Overheatng. Protection(Power module)

Freq. speed control(up/down speed)

V/F control

Total current control (over current protection)

DC peak current control

4 way valve control

Outdoor fan motor control

Discharge pipe temp. control

Low ambient

EEV Control

Service Manual 29

Functions

Healthy Dehumidification Operation Mode.

( )

Remote Control

Operation ON/OFF

Reset

Operation Mode Selection

Temperature Setting

Timer Selection

Timer Setting

JET COOL

Timer Cancel

Sleep Operation

Airflow Direction Control

(Cooling

model only)

(Heating

model only)

TEMPERATURE

LOW HIGH

Cooling Operation Mode.( )

Heating Operation Mode.( )

Auto Operation Mode.( )

Horizontal Airflow Direction Control Button(Optional)

Room, Temperature Display

Setting the Time or Timer

PLASMA(Optional)

ON OFF

SET

PLASMA

CANCEL

Heater

(Optional)

(Optional)

Auto Clean

Fan Speed Selection

(Low) (Med) (High) (CHAOS)

Power Save Cooling Button

AUTO CLEAN

: (High:39°C Low:11°C)

: OFF, ON, OFF ON

: Cancel Sleep Mode, Timer ON or Timer OFF

: 1, 2, 3, 4, 5, 6, 7, Off Timer

Cooling

Down to 18°C
Up to 30°C

Heating

Down to 16°C
Up to 30°C

30 Room Air Conditioner

Operation

LED display of indoor unit

Operation

■ OEM Brand

■ LG Brand/OEM Brand

Operation Indicator

Sleep Timer Indicator

PLASMA Indicator

Timer Indicator

Preheat Indicator

Setting Temp.

• On while in appliance operation, off while in appliance pause.

• Blinking(3sec off/0.5sec on) according to Error Code as long as the system malfunctions.

• On while in sleep timer mode, off when sleep timer cancel or appliance operation pause.

• On while in plasma mode, off when plasma mode cancel.

• On while in timer mode(on/off), off when timer mode is completed or canceled.

• Off except when hot start during heating mode operation or while in defrost control.

• Cooling/heating/dehumidification mode : setting temperature from remote control

• Fuzzy operation mode : fuzzy key data(5sec on) ➔ AI

Operation Indicator

Power Saving Indicator

Timer Indicator

Preheat Indicator

• On while in appliance operation, off while in appliance pause.

• Flashing while in disconnection or short in Thermistor. (3 sec off/0.5 sec on)

• On while in power saving cold mode, off when power saving cold cancel.

• On while in timer mode(on/off) and sleep timer mode (on), off when timer mode is

completed or canceled.

• Off except when hot start during heating mode operation or while in defrost control.

PLASMA

Operation

indicator

Shape of

display

Cooling

heating

dehumidifi-

cation

Setting

temp.

Standard Too hot Hot Cold Too cold

A.I operation mode

Comfortable

Jet

(Cool, Heat)

Energy save

in cooling

mode

Test

operation

Service Manual 31

Operation

■ How to operate the power display (LG Brand/OEM Brand)

• It must be displayed the power level that will be operating frequency of compressor.

• It indicates power levels that compressor operating frequency is controlled to depend on indoor and outdoor

conditions.

• It is displayed as below.

❐ Heat mode operation

- Power level 1: below Step 2 of COMP. operating frequency

- Power level 2: below Step 4 of COMP. operating frequency

- Power level 3: Equal Step 5 of COMP. operating frequency

- Power level 4: below Step 7 of COMP. operating frequency

Power Level 1

Power Level 2

Power Level 3

Power Level 4

Power Level 1

Power Level 2

Power Level 3

Power Level 4

PLASMA

32 Room Air Conditioner

Operation

• If the indoor pipe temperaure is below 0°C in 7 min. after the compressor operates without pause while in
cooling cycle operation mode,
➔ compressor, outdoor fan are turned off.

• When indoor pipe temp. is 7°C or higher after 2 min pause of compressor
➔ compressor, outdoor fan is turned on according to the condition of the room temperature.

• Control condition : The system operates standard operation without this condition as follows.
Setting temperature <25°C
Indoor fan speed ≤ low speed
Outdoor temperature < 30°C

• Control method

In operation for 5~20 minutes in , , conditions, return to the previous COMP STEP after operation for
5~40 minutes at the COMP STEP 3.

Comp. free

Comp. Step 4
Comp. Step 2

Comp. off

0˚C

3˚C

6˚C

7˚C

Indoor pipe
temp.

Protection of the evaporator pipe from frosting

Protection of the indoor fan from droplet formation (Enclosure sweat and condensed disposal test)

Service Manual 33

Operation

Cooling mode operation

• Operating frequency of compressor depend on the difference of the temperature.
(= intake air Temp.- Compressor off Temp.

• Compressor off temp.= setting temp. -0.5°C

on temp. = setting temp. +0.5°C

• If compressor operates at some operating frequency, the operating frequency of compressor cannot be
changed within 30 seconds.

• Condition of compressor turned off

- When intake air temperature stay at the temperature between setting temp.

-

0.5°C and setting temp.

-

1.0°C for 3 minutes continuously.

- When intake air temperature reaches below the temperature of setting temp.

-

1.0°C.

• Compressor 2 minutes delay

- The compressor can restart minimum 2 minutes later after compressor off.

Temp. differences Comp. Operating frequency

over 3.0°C Step 7
over 2.5°C Step 6

2.0~2.49°C Step 5

1.5~1.99°C Step 4

1.0~1.49°C Step 3

0.5~0.99°C Step 2

0.0~0.49°C Step 1

[The operating freq. step of comp.]

[The targeting operating freq. of comp. each model]

Model

AS-W096QGG1 35 40 47 57 62 65 69

AS-W126RGH1 35 40 53 60 70 75 80
AS-W186TGH1 20 32 58 64 72 80 90

AS-W246TGH1/TLG1 35 48 53 57 61 64 67

Comp. Operating frequency

Step 1 Step 2 Step 3 Step 4 Step 5(Fc) Step 6 Step 7

34 Room Air Conditioner

Operation

Healthy Dehumidification mode operation

• When the dehumidification operation is set by the remote controller the intake air temperature is detected and
the setting temp. is automatically set according to the intake air temperature.

• When intake air temp reaches above the temp of setting +1.0°C, condition of compressor same as cooling
mode operation.

• When intake air temperature reaches bolow the temp of setting –1.0°C, compressor operate step1~step3 and
indoor fan speed repeatly operate low or stop.

Intake air Temp.

32°C ≤ intake air temp.

26°C ≤ intake air temp. < 32°C

24°C ≤ intake air temp.< 26°C

18°C < intake air temp. < 24°C

intake air temp. ≤ 18°C

Setting Temp.

25°C
25°C

intake air temp. -1°C

intake air temp. -0.5°C

18°C

Service Manual 35

Operation

• Operating frequency of compressor depend on the difference of the temperature

(= compressor off temp. - intake air temp.)

• Compressor off temp. = setting temp.+3.0°C

on temp. = setting temp.

• If compressor operates at some operation frequency, the operating frequency of compressor cannot be

changed within 30 seconds.

• Condition of compressor turned off

- When intake air temperature reaches +3°C above the setting temperature.

• Condition of indoor fan turned off

- While in compressor on:indoor pipe temp. < 30°C

• While in defrost control, between the indoor and outdoor fans are turned off.

• Compressor 2minutes delay

- After compressor off, the compressor can restart minimum 2 minutes later.

Temp. differences

over 3.0°C

2.5~3.0°C

2.0~2.49°C

1.5~1.99°C

1.0~1.49°C

0.5~0.99°C

0.0~0.49°C

Comp. Operating frequency

Step 7
Step 6
Step 5
Step 4
Step 3
Step 2
Step 1

[ The operating freq. step of comp]

[The targeting operating freq. of comp. each model]

Heating mode operation

Model

AS-W096QGG1 35 43 53 64 74 77 80

AS-W126RGH1 35 43 53 64 76 78 80
AS-W186TGH1 25 38 47 65 82 87 92

AS-W246TGH1/TLG1 35 42 53 61 67 70 73

Comp. Operating frequency

Step 1 Step 2 Step 3 Step 4 Step 5(Fc) Step 6 Step 7

36 Room Air Conditioner

Operation

Fuzzy mode operation

• When any of operation mode is not selected like the moment of the power on or when the unit turned off, the
operation mode is selected.

• When determining the operation mode, the compressor, outdoor fan are off and only the indoor fan is operat­ed for 15~20 seconds, then an operation mode is selected according to.

Basis of determining operating mode

Indoor temp.

over 24°C

21~24°C

below 21°C

Operating Mode

Cooling

Healthy Dehumidification

Heating

1. Fuzzy operation for cooling

• According to the setting temperature selected by Fuzzy rule, the operating frequency of compressor is deter­mined like cooling mode operation.

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temperature at that time.

• When the Fuzzy key(=setting temp. key) is input after the initial setting temperature is selected, the Fuzzy
key value and intake air temperature at that time are compared to select the setting temperature automatical­ly according to the fuzzy rule.

• While in Fuzzy operation, the air flow speed of the indoor fan is automatically operated by Fuzzy logic.

at beginning

during opertion

Intake air temp.

over 26°C

18~26°C

below 18°C

18~30°C

below 18°C

over 30°C

Setting temp.

25°C

intake air temp. -0.5°C

18°C

Fuzzy rule
18°C Fuzzy rule
30°C Fuzzy rule

Fan speed

Fuzzy airflow

Service Manual 37

Operation

2. Fuzzy operation for Heating

• According to the setting temperature selected by Fuzzy rule, the operating frequency of compressor is deter­mined like heating mode operation.

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temperature at that time.

• When the Fuzzy key(=setting temp. key) is input after the initial setting temperature is selected, the Fuzzy
key value and intake air temperature at that time are compared to select the setting temperature automatical­ly according to the Fuzzy rule.

• While in Fuzzy operation, the airflow speed of the indoor fan is automatically operated by Fuzzy logic.

at beginning

during opertion

Intake Air temp.

over 20°C

below -20°C

16~30°C

below 16°C

over 30°C

Setting temp.

intake air temp. +0.5°C

20°C

Fuzzy rule
16°C Fuzzy rule
30°C Fuzzy rule

Fan speed

Fuzzy airflow

3. Fuzzy operation for dehumidification

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temperature at that time.

• According to the setting temperature selected by Fuzzy rule, the operating frequency of compressor is deter­mined like dehumidefication mode operation.

at beginning

during operation

Intake Air temp.

over 26°C

18~26°C

below 18°C

18~30°C

below 18°C

over 30°C

Setting temp.

25°C

intake air temp. -0.5°C

18°C

Fuzzy rule
18°C Fuzzy rule
30°C Fuzzy rule

Fan speed

Fuzzy airflow

38 Room Air Conditioner

Operation

• While in heating mode or Fuzzy operation, the Jet Cool key cannot be input. When it is input while in the
other mode operation(cooling, dehumidification, ventilation), the Jet Cool mode is operated.

• In the Jet Cool mode, the indoor fan is operated super-high speed for 30 min. at cooling mode operation.

• In the Jet Cool mode, the room temperature is controlled to the setting temperature, 18°C.

• When the sleep timer mode input while the Jet Cool mode operation, the Jet Cool mode has the priority.

• When the Jet Cool key is input, the upper/lower vane is reset to those of the initial cooling mode and then

operated in order that the air outflow could reach further.

• While in cooling mode or Fuzzy operation, the Jet Heat key cannot be input. When it is input while in the
Heating mode operation (dehumidification), the Jet Heat mode is operated.

• In the Jet Heat mode, the indoor fan is operated super-high speed for 60 min. at Heating mode operation.

• In the Jet Heat mode, the room temperature is controlled to the setting temperature, 30°C.

• When the sleep timer mode input while the Jet Heat mode operation, the Jet Heat mode has the priority.

• When the Jet Heat key is input, the upper/lower vane is reset to those of the initial Jet heating mode and

then operated in order that the air outflow could reach under flow.

1. Chaos swing mode

• By the Chaos swing key input, the upper/lower vane automatically operates with the Chaos swing or it is
fixed to the desired direction.

CLOSED

Chaos Swing On

Chaos Swing

The first path

Mode 9

Mode 8

Mode 7
Mode 6

Mode 5

Mode 4

Mode 3

Mode 2

Mode 1

OPEN

Jet cool mode operation

Jet heat mode operation

Swing mode

Service Manual 39

Operation

1. Sleep timer operation for cooling cycle

• While in cooling mode operation, 30 min. later since the start of the sleep timer, the setting temperature
increase by 1°C. After another 30min. elapse, it increases by 1°C again.

2. Sleep timer operation for heating cycle

• While in heating mode operation, 60 min. later since the start of the sleep timer, the setting temperature
decrease by 1°C. After another 60min. elapse, it decreases by 1°C again.

Setting temp. (˚C)

1.0˚C up

1.0˚C up

Cooling ON temp.
(Setting temp. +0.5˚C)

Cooling OFF temp.
(Setting temp. -0.5˚C)

0.5 1 Sleep time (hr

)

• When the sleep time is reached after [1,2,3,4,5,6,7hr] is input by the remote control during the operation, the
operation of the appliance stops.

• When the appliance is on pause, the sleep timer mode cannot be input.

Sleep timer operation

Setting temp. (°C)

Heating OFF temp.
(Setting temp. +3.0°C)

Heating ON temp.
(Setting temp)

1.0°C down

1.0°C down

1 2 Sleep time (hr

)

40 Room Air Conditioner

Operation

Auto restarting operation

Forced operation

Trial Operation

• When the power is restarted after a sudden power failure while in appliance operation, the mode before the
power failure is kept on the memory and the appliance automatically operates in the mode on the memory.

• Operation mode that is kept on the memory

- State of operation ON/OFF

- Operation mode/setting temp./selected airflow speed

- Sleep timer mode/remaining time of sleep timer

- Chaos Swing

• To operate the appliance by force in case that the remote control is lost, the forced operation selection switch
is on the main unit of the appliance to operate the appliance in the standard conditions.

• The operation condition is set according to the outdoor temp. and intake air temperature as follows.

❈ The unit select before operating mode in 3 hours.

• Press the Tact Switch for compulsory operation of the main body for 3 seconds in order to operate in the trial
operation mode.

- Operation mode: Cold

- Indoor pan: Strong wind

- COMP frequency: Step 5

- COMP compulsorily operates for about 18 minutes irrespective of indoor temperature.

Indoor temp.

over 24°C

21~24°C

below 21°C

Setting temp.

22°C
23°C
24°C

Setting speed of

indoor fan

High speed

Operating Mode

Cooling

Healthy Dehumidification

Heating

Service Manual 41

Operation

• Power relay turns on 1 second later after the power is input to the outdoor unit.

• Control sequence : power on ➔ PTC operating ➔ power relay on

■ CT1 control

• If the operating current reaches I1, the operating frequency of the compressor decrease.

• After decreasing the operating frequency by 1step, if operating current is below I1 for 60 seconds continuous-

ly, the operating frequency of compressor increase by 1step.

■ CT2 control

• If the operating current of the appliance reaches I2, the compressor stop instantly and 2 minutes later the
compressor restart again.

• If CT2 occurs 5 times within 1hour, the appliance turn off and display ERROR CODE 7.

❇ I1:Current of operating frequency down

I2: Current of compressor cut off

cf. I1 is set the lowest level between intial value and in case dectection of dc paeak current.

Control table

■ DC Peak Current Error by a fault signal of IPM

• If the operating current of IPM reaches 35A ±3A, the compressor stop instantly.

• If DC PEAK occurs 5 times within 1 hour, the appliance turns off and display ERROR CODE 6

.

■ DC Peak Current Error by the compressor lock

• If the DC LINK voltage below DC 140V occurs 5 times within 1 hour while the compressor is operating, the
appliance turns off and display ERROR CODE 6.

■ DC Peak Current Error by the Outdoor Fan Lock

• If it’s 5 times within 1 hour in case of the temperature of outdoor pipe TH is over 65°C while the compressor is
operating, the appliance turns off and display ERROR CODE 6.

Power relay control

Protection from total current control

Protection from DC Peak Current

I1

Cooling Heating Cooling Heating

Outdoor temp ≥ 38°C Outdoor temp < 38°C

I2

Model

1 AS-W096QGG1 5.5 6.5 6 7 9
3 AS-W126RGH1 6.5 7.5 7 8 10
4 AS-W186TGH1 10.5 11.5 11 12 14
5 AS-W246TGH1 13.5 14 14 14.5 15.5

42 Room Air Conditioner

• If the temperature of the heat sink TH. reaches over Toff, the Compressor stop instantly.

• It will be limited the compressor operating frequency according to the heat sink TH.(refer to below FIG.)

• It will be blink 4 times, when the thermistor is open or short, also the temperature is over Toff.

• If the temperature of the discharge pipe of compressor reaches over 130°C or below -30°C the compressor

stop instantly.

• It will be limited the compressor operating frequency according to the compressor dome TH.(Refer to below
Fig.)

• Temperature range by COMP SPEC varies by 10°C.

Operation

Portection from overheating of power module

Portection from overheating of compressor

1 AS-W096QGG1 85 95
2 AS-W126RGH1 85 95
3 AS-W186TGH1 85 95
4 AS-W246TGH1 85 95

No. MODEL T on T off

1 AS-W096QGG1 102 110
2 AS-W126RGH1 105 115
3 AS-W186TGH1 98 108
4 AS-W246TGH1 98 108

No. MODEL T on T off

T off °C

∆T = (T off - T on)
T1 = T on + ∆T
T2 = T on + 2 * ∆T

Heat Sink Temp.

T2 °C

T1 °C

T on °C

COMP

Freq.

Free OFF FreeFc-1 Fc-1Fc-2 Fc-2

D-Pipe T emp .

COMP Freq. Free Free

Fh min

∆T = (T off - T2)/2
T1 = T2 + 2 * ∆T
T3 = T2 + ∆T

OFFFc-1 Fc-1Fc-2 Fc-2

Service Manual 43

Operation

• While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing,
reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit.

• Defrosting control is available 50 minutes later since heating cycle started and the pipe temperature of out­door unit reaches below -6°C.

Setting Freq.

Operating
Freq. of
Comp.

4-Way

EEV
Open step

Outdoor
FAN

Indoor
FAN

Pre-Heat
LED

Deice STEP

Fh

min

Minimum Time 15s 6s 30s 10s 1 min

of Heating

Main Deice time

Fh

min

Fh

min

Step 5+

Step 6

ON

OFF

Setting
Speed

ON

Hot

Start

OFF

Hot

Starting

ON

OFF

OFF

0123456

Setting

350(Option) Starting step

Setting
Freq.

Setting
Speed

Setting
Speed

Hi Speed

Defrosting control

44 Room Air Conditioner

Operation

• Function used to perform the Self Cleaning to prevent the Unit from Fungus and Bad Odors.

• Used after the Shut Down of Cooling Operation to Clean the Evaporator and keep it as fresh for the Next operation.

• During Self Cleaning the Outdoor Unit is Switched off.

• The function is easy to be operated as It is accessed through the Remote Controller.

Auto Cleaning

Auto Changeover

Low Ambient

Comp.

ON ON OFF

OFF Setting Step Low

Indoor Fan

ON

2) Cooling/only Model

Cool Start Cooling CYCLE

OFF

20 Sec

30 Min

Fan

ON

1) Heat/pump Model

Cool Start Cooling CYCLE

OFF

Comp.

ON ON ONOFF OFF

Indoor Fan OFF Setting Step Low Low Low

13 Min20 Sec

HeatingFan

60 Sec 120 Sec

Fan

• The air conditioner changes the operation

mode automatically to keep indoor tempera­ture.

• When room temperature vary over ±2°C with

respect to setting temperature, air condition­er keeps the room temperature in ±2°C with
respect to setting temperature by auto
change mode.

• If outdoor temperature drops below certain temperature,liquid back is prevented by reducing fan speed.

It can prevent frosting of evaporator and keep cooling operation

• No matter even if the outdoor temperature reaches -10°C.

• You can Cool your room at your desired temperature all your around.

Freq.

- 0°C

°…

Outdoor temp.

Outdoor pipe temp.
0°C outdoor fan On/Off
control

°

Comp Freq.

Outdoor fan

On

On

Off

Off

Outdoor temp.:-10°C

-5

0

5

10

15

20

25

0 50 100 150 200

Time(Min.)

Temp.(°C)

Outdoor fan On/Off control

Cond . temp.

COOLING

Auto
Change
Mode.

Outdoor temp.
Indoor temp.

Outdoor
temp.

30°C

20°C

10°C

+

2°C

+

1°C

+

0.5°C

Set Temp.

-

0.5°C

-

1°C

-

2°C

HEATING

Service Manual 45

Disassembly

Disassembly

Indoor Unit

Warning :

Disconnect the unit from power supply before making
any checks.
Be sure the power switch is set to “OFF”.

To remove the Grille from the Chassis.

• Set the up-and-down air discharge louver to open
position (horizontally) by finger pressure.

• Remove the securing screws.

• To remove the Grille, pull the lower left and right

side of the grille toward you (slightly tilted) and lift it
straight upward.

1. Before removing the control box, be sure to

take out the wire screwed at the other end.

Display
P.C.B
Conductor

Step Motor
Conductor

Earth
Conductor

Motor
Conductor

Sensor
Conductor

Earth
Conductor

46 Room Air Conditioner

Disassembly

2. To remove the Control Box.

• Remove securing screws.

• Pull the control box out from the chassis

carefully.

3. To remove the Discharge Grille.

• Unhook the discharge grille and pull the
discharge grille out from the chassis carefully.

4. To remove the Evaporator.

• Remove 3 screws securing the evaporator(at the
left 2EA in the Eva Holder, at the right 1EA).

Caution label

CAUTION:

When repair, do not damage

the Caution label.

Service Manual 47

Disassembly

• Unhook the tab on the right inside of the chassis

at the same time, slightly pull the evaporator
toward you until the tab is clear of the slot.

5. To remove the Motor Cover

• Remove 2 securing screw.

• Pull the motor cover out from the chassis

carefully.

6. To remove the Cross-Flow Fan

• Loosen the screw securing the cross-flow fan to

the fan motor (do not remove).

• Lift up the right side of the cross-flow fan and the

fan motor, separate the fan motor from the
cross-flow fan.

• Remove the left end of the cross-flow fan from

the self-aligning bearing.

Motor cover

48 Room Air Conditioner

Schematic Diagram

Schematic Diagram

Electric Control Device

• Indoor

Service Manual 49

Schematic Diagram

Outdoor(AS-W096_Series, AS-W126_Series)

50 Room Air Conditioner

Schematic Diagram

Outdoor(AS-W186_Series/AS-W246_Series)

Service Manual 51

Schematic Diagram

Wiring Diagram

Indoor Unit
AS-W096QGG1, AS-W126RGH1, AS-W186TGH1, AS-W246TGH1, AS-W246TLG1

POWER

TERMINAL
ASSY

DISPLAY PWB ASSY

3854A20238W

CN­DISP1

CN­DISP2

RY-COMP

TO OUTDOOR UNIT

CN-T/BLOCK

INDOOR
THERMISTOR

PIPE
THERMISTOR

STEP

MOTOR

STEP

MOTOR

AC250V/T2A

CN-AC/DC

CN-AC/DC

CN-MOTOR

CN-THCN-U/DCN-L/R

CN-HVBCN-12VCN-CONT

H.V

ASM

S/W1

S/W2

AIR

CLEAN

(PLASMA)

SH-CAPA

43

MOTOR

AC
PWB ASSY

DC
PWB ASSY

SSR

GN
(GN/YL)

OR

BK

BL(WH/Ribbed)

BL

RD

RD

BK

BK

BKBKBK
BKBKBK

BK

GR

GN/YL

BR(BK/Plained)

BR

BR YL

1(L)

2(N)

34

BK

BK

WH

PTC
HEATER

PTC CONROL
PWB ASSY

CN-PTC

4

3

CN-PTC

52 Room Air Conditioner

Schematic Diagram

Outdoor Unit
AS-W096QGG1, AS-W126RGH1

AS-W186TGH1, AS-W246TGH1, AS-W246TLG1

3854A20310C

WCN-NOISE

20A/AC 250V

BR

3(BK)

WCN-NOISE

2(BK)

BL

BK

OR

YL

BK BK

RD
BL
YL

REVERSING
VALVE

REACTOR

HEAT SINK
TH.

OUTDOOR
TH.

PIPE TH. COMP TH.

RD

GN/YL

CN­FAN1

WCN­CAP1

WCN­CAP2

RY-H

CN-COIL1 CN-COIL2

CN-U

+++

CN-V
CN-W

CN-TH1 CN-D-PIPE

Motor

SPM2

COMP

TERMINAL
BLOCK

TO INDOOR UNIT

Outdoor PWB ASSY

OUTDOOR WIRING DIAGRAM

CN-TH2

CN­4WAY

RY-4WAY

WCN-NOISE

4(BK)

WCN-NOISE

1(BK)

FUSE

1(L)
2(N)

3

Service Manual 53

Schematic Diagram

Components Location

INDOOR
MAIN P.W.B ASSEMBLY (DC PART)

• TOP VIEW • BOTTOM VIEW

INDOOR
MAIN P.W.B ASSEMBLY (AC PART)

• TOP VIEW • BOTTOM VIEW

54 Room Air Conditioner

Schematic Diagram

DISPLAY ASSEMBLY(AS-W096QGG1, AS-W126RGH1, AS-W186TGH1, AS-W246TGH1,

AS-W246TLG1)

TOP VIEW

BOTTOM VIEW

Service Manual 55

Schematic Diagram

OUTDOOR MAIN P.W.B ASSEMBLY(AS-W096QGG1, AS-W126RGH1)

• BOTTOM VIEW

• TOP VIEW

56 Room Air Conditioner

Schematic Diagram

OUTDOOR MAIN P.W.B ASSEMBLY(AS-W186TGH1, AS-W246TGH1)

• TOP VIEW

• BOTTOM VIEW

Service Manual 57

Troubleshooting Guide

Troubleshooting Guide

INDOOR UNIT OUTDOOR UNIT

HEAT
EXCHANGE
(EVAPORATOR)

HEAT
EXCHANGE
(CONDENSER)

COMPRESSOR

ACCUMU
LATOR

GAS SIDE

3-WAY VALVE

LIQUID SIDE

EER

3-WAY VALVE

COOLING
HEATING

REVERSING
VALVE

INDOOR UNIT OUTDOOR UNIT

HEAT
EXCHANGE
(EVAPORATOR)

HEAT
EXCHANGE
(CONDENSER)

COMPRESSOR

ACCUMU
LATOR

GAS SIDE

3-WAY VALVE

LIQUID SIDE

3-WAY VALVE

CHECK VALVE

COOLING
HEATING

REVERSING
VALVE

(1) Model Capillary Tube

Refrigeration Cycle Diagram

(2) Model Adopted Electrion Expansion Valve

58 Room Air Conditioner

Troubleshooting Guide

CAUTION:* Capicity is based on standard length and maximum allowance length

is the basis of reliability.

* Oil trap should be installed per 5~7 meters.

Outdoor unit

Indoor unit

A

B

In case more than 5m

7k~14k

3/8"(Ø9.52) 1/4"(Ø6.35) 4 or 7.5 7 15 20
1/2"(Ø12.7) 1/4"(Ø6.35) 4 or 7.5 7 15 20
1/2"(Ø12.7) 1/4"(Ø6.35) 4 or 7.5 15 30 20

18k~28k 5/8"(Ø15.88) 1/4"(Ø6.35) 4 or 7.5 15 30 20

5/8"(Ø15.88) 3/8"(Ø9.52) 4 or 7.5 15 30 30

30k~38k

5/8"(Ø15.88) 3/8"(Ø9.52) 7.5 15 30 30
3/4"(Ø19.05) 3/8"(Ø9.52) 7.5 15 30 50

Pipe Size

Capacity

(Btu/h)

GAS LIQUID

Additional

Refrigerant

(g/m)

Max.

Length

A (m)

Max.

Elevation

B (m)

Standard

Length

(m)

Pipe Length and the Elevation

Oil trap

Indoor unit

A

Outdoor unit

B

Service Manual 59

Troubleshooting Guide

2-way, 3-way Valve

2-way Valve (Liquid Side) 3-way Valve (Gas Side)

Shaft position Shaft position Service port

Closed Closed Closed

(with valve cap) (with valve cap) (with cap)

Open Closed Open

(counter-clockwise) (clockwise) (push-pin or with

vacumm pump)

Open Open Closed

(with valve cap) (with valve cap) (with cap)

Closed Open Open

(clockwise) (counter-clockwise) (connected manifold

gauge)

Open Open Open

(with charging

cylinder)

Open Open Open

(with charging

cylinder)

Open Open

Open Open

Works

Shipping

Air purging
(Installation)

Operation

Pumping down
(Transfering)

Evacuation
(Servicing)

Gas charging
(Servicing)

Pressure check
(Servicing)

Gas releasing
(Servicing)

1.

2.

3.

4.

5.

6.

Valve cap

Open position
Closed position

Pin

Service
port

Service
port cap

To outdoor unit

Flare nut

To
piping
connection

To outdoor unit

Hexagonal wrench (4mm)

Open position
Closed position

To
piping
connection

Flare nut

Open

(with charging cylinder)

Open

(with charging cylinder)

60 Room Air Conditioner

Troubleshooting Guide

Required tools :

hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints, and gas leak detector.

The additional gas for air purging has been charged
in the outdoor unit.
However, if the flare connections have not be done
correctly and there gas leaks, a gas cylinder and the
charge set will be needed.

The air in the indoor unit and in the piping must be
purged. If air remains in the refrigeration pipes, it will
affect the compressor, reduce to cooling capacity,
and could lead to a malfunction.

• Procedure

(1) Recheck the piping connections.
(2) Open the valve stem of the 2-way valve coun-

terclockwise approximately 90°, wait 10 sec­onds, and then set it to closed position.

– Be sure to use a hexagonal wrench to operate

the valve stem.

(3) Check for gas leakage.

– Check the flare connections for gas leakage.

(4) Purge the air from the system.

– Set the 2-way valve to the open position and

remove the cap from the 3-way valve’s service
port.

– Using the hexagonal wrench to press the valve

core pin, discharge for three seconds and then
wait for one minute. Repeat this three times.

(5) Use torque wrench to tighten the service port

nut to a torque of 1.8kg.cm.

(6) Set the 3-way valve to the back seat.
(7) Mount the valve stem nuts to the 2-way and 3-

way valves.

(8) Check for gas leakage.

– At this time, especially check for gas leakage

from the 2-way and 3-way valve’s stem nuts,
and from the service port nut.

Service port nut:
Be sure, using a torque wrench to tighten the service port nut (after using the service port), so that it prevents the
gas leakage from the refrigeration cycle.

CAUTION:

Do not leak the gas in the air during Air purging.

CAUTION:

If gas leakage are discovered
in step (3) above, take the following
mesures :

If the gas leaks stop when the piping connections
are tightened further, continue working from step (4).
If the gas leaks do not stop when the connections
are retightened, repair the location of the leak, dis­charge all of the gas through the service port, and
then recharge with the specified amount of gas from
a gas cylinder.

Liquid side

Outdoor unit

3-way
valve

Gas side

Indoor unit

2-way
valve

Open

Clsed

Air purging

Service Manual 61

Troubleshooting Guide

• Procedure

(1) Confirm that both the 2-way and 3-way valves

are set to the open position.

– Remove the valve stem caps and confirm that

the valve stems are in the raised position.

– Be sure to use a hexagonal wrench to operate

the valve stems.

(2) Operate the unit for 10 to 15 minutes.

(3) Stop operation and wait for 3 minutes, then

connect the charge set to the service port of
the 3-way valve.

– Connect the charge hose with the push pin to

the service port.

(4) Air purging of the charge hose.

– Open the low-pressure valve on the charge set

slightly to air purge from the charge hose.

(5) Set the 2-way valve to the closed position.

(6) Operate the air conditioner at the cooling

cycle and stop it when the gauge indicates
1kg/cm2g.

(7) Immediately set the 3-way valve to the closed

position.

– Do this quickly so that the gauge ends up indi-

cating 3 to 5kg/cm2g.

(8) Disconnect the charge set, and mount the 2-

way and 3-way valve’s stem nuts and the ser­vice port nut.

– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.

Lo

Closed

Purge the air

Outdoor unit

Indoor unit

Liquid side

Gas side

CLOSE

Open

2-Way
valve

3-Way
valve

CLOSE

Pumping Down

62 Room Air Conditioner

Troubleshooting Guide

Re-air Purging

(Re-installation)

• Procedure

(1) Confirm that both the liquid side valve and the

gas side valve are set to the closed position.

(2) Connect the charge set and a gas cylinder to

the service port of the Gas side valve.

– Leave the valve on the gas cylinder closed.

(3) Air purging.

– Open the valves on the gas cylinder and the

charge set. Purge the air by loosening the flare
nut on the liquid side valve approximately 45°
for 3 seconds then closing it for 1 minute;
repeat 3 times.

– After purging the air, use a torque wrench to

tighten the flare nut on liquid side valve.

(4) Check for gas leakage.

– Check the flare connections for gas leakage.

(5) Discharge the refrigerant.

– Close the valve on the gas cylinder and dis-

charge the refrigerant until the gauge indicates
3 to 5 kg/cm2g.

(6) Disconnect the charge set and the gas cylin-

der, and set the Liquid side and Gas side
valves to the open position.

– Be sure to use a hexagonal wrench to operate

the valve stems.

(7) Mount the valve stem nuts and the service

port nut.

– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.

CAUTION: Do not leak the gas in the air

during Air Purging.

Lo

Closed

OPEN

Closed

Gas cylinder

R22

Outdoor unit

Indoor unit

Liquid side

Gas side

CLOSE

3-Way
valve

3-Way
valve

Service Manual 63

Troubleshooting Guide

Balance Refrigerant of the 3-way Valve

• Procedure

(1) Confirm that both the 2-way and 3-way valves

are set to the back seat.

(2) Connect the charge set to the 3-way valve’s

port.

– Leave the valve on the charge set closed.
– Connect the charge hose to the service port.

(3) Open the valve (Lo side) on the charge set and

discharge the refrigerant until the gauge indi­cates 0 kg/cm2G.

– If there is no air in the refrigerant cycle (the

pressure when the air conditioner is not running
is higher than 1 kg/cm2G), discharge the refrig­erant until the gauge indicates 0.5 to 1
kg/cm2G. if this is the case, it will not be neces­sary to apply a evacuatin.

– Discharge the refrigerant gradually; if it is dis-

charged too suddenly, the refrigeration oil will
also be discharged.

Lo

Open

Open

3-Way
valve

3-Way
valve

Gas side

CLOSEOPEN

Outdoor unit

Liquid side

Indoor unit

64 Room Air Conditioner

Troubleshooting Guide

Evacuation

(All amount of refrigerant leaked)

• Procedure

(1) Connect the vacuum pump to the center hose

of charge set center hose

(2) Evacuation for approximately one hour.

– Confirm that the gauge needle has moved

toward -76 cmHg (vacuum of 4 mmHg or less).

(3) Close the valve (Lo side) on the charge set,

turn off the vacuum pump, and confirm that
the gauge needle does not move (approxima­tely 5 minutes after turning off the vacuum
pump).

(4) Disconnect the charge hose from the vacuum

pump.

– Vacuum pump oil.

If the vacuum pump oil becomes dirty or
depleted, replenish as needed.

Lo

Open

Open

Vacuum pump

3-Way
valve

Outdoor unit

Liquid side

Indoor unit

Gas side

3-Way
valve

CLOSE

OPEN

Service Manual 65

Troubleshooting Guide

Gas Charging

(After Evacuation)

• Procedure

(1) Connect the charge hose to the charging

cylinder.

– Connect the charge hose which you dis-con-

nected from the vacuum pump to the valve at
the bottom of the cylinder.

– If you are using a gas cylinder, also use a

scale and reverse the cylinder so that the sys­tem can be charged with liquid.

(2) Purge the air from the charge hose.

– Open the valve at the bottom of the cylinder

and press the check valve on the charge set to
purge the air. (Be careful of the liquid refriger­ant). The procedure is the same if using a gas
cylinder.

(3) Open the valve (Lo side on the charge set and

charge the system with liquid refrigerant.

– If the system can not be charged with the spec-

ified amount of refrigerant, it can be charged
with a little at a time (approximately 150g each
time) while operating the air conditioner in the
cooling cycle; however, one time is not suffi­cient, wait approximately 1 minute and then
repeat the procedure (pumping down-pin).

(4) Immediately disconnect the charge hose from

the 3-way valve’s service port.

– Stopping partway will allow the gas to be dis-

charged.

– If the system has been charged with liquid

refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose.

(5) Mount the valve stem nuts and the service

port nut.

– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.

\

This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.

Indoor unit

Check valve

Charging
cylinder

Lo

(1)

OPEN

Liquid side

Gas side

CLOSE

3-Way

Open

valve

Open

3-Way
valve

Outdoor unit

66 Room Air Conditioner

Troubleshooting Guide

Trouble analysis

1. Check temperature difference between intake and discharge air and operating current.

Temp. Difference

Temp. difference : approx. 0°C
Current : less than 80% of

rated current

Temp. difference : approx. 8°C
Current : less than 80% of

rated current

Temp. difference : less than 8°C
Current : over the reated

current

Temp. difference : over 8°C

Operating Current

• All amount of refrigerant leaked
out. Check refrigeration cycle.

• Refrigerant leakege

Clog of refrigeration cycle
Defective compressor

• Excessive amount of refrigerant

• Normal

Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower tem­perature difference is larger.

2. Check temperature and pressure of refrigeration cycle.

1. The suction pressure is usually 8.5~9.5kg/cm2G(Cooling) at normal condition.

2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.

NOTICE

NOTICE

Suction pressure Temperature

(Compared with (Compared with Cause of Trouble Description

the normal value) the normal valve)

Defective compressor Current is low.
Defective 4-way reverse valve

Excessive amount of High pressure does not quickly

Normal refrigerant rise at the beginning of

operation.

Insufficient amount of Current is low.

Lower Higher refrigerant (Leakage)

Clogging Current is low.

High

Higher

Cycle Parts

Service Manual 67

Troubleshooting Guide

Self-diagnosis function

The cause of malfunction

Indoor TH. is short or open.

Temp. of Heat sink is over 95°C,
or Heat sink TH. is shortor open.

Comunication error (serial
comunication).

DC peak error.

Running current is over­loaded.

Outdoor fan lock error
(BLDC fan model)

The LED01M will be blinking
twice.

The LED01M will be blinking 4
times.

The LED01M will be blinking 5
times.

The LED01M will be blinking 6
times.

The LED01M will be blinking 7
times.

The LED01M will be blinking 9
times.

Keep operating state.

Restart compressor when heat sink
Temp. is 85°C below.

The operation is off(enable to restart
by remote controller).

Compressor will be turned off immediately.
(not enable to restart by remote controller)

Compressor will be turned off immediately.
(not enable to restart by remote controller)

The operation is off(enable to restart
by remote controller).

Malfunction indicator The operating state

Error
Code

1. The malfunction indicator of indoor (see the operating LED of the INDOOR)

The cause of malfunction

Error
Code

1

Indoor TH. is short or open.

Outdoor TH. is short or open.

Temp. of Heat sink is over 95°C.
/Heat sink TH. is short or open.

Comunication error (serial
comunication).

DC peak error.

Running current is over­loaded. (CT2)

D-PIPE TH is short or open.

The operating LED will be blink­ing once.

The operating LED will be blink­ing twice.

The operating LED will be blink­ing 4 times.

The operating LED will be blink­ing 5 times.

The operating LED will be blink­ing 6 times.

The operating LED will be blink­ing 7 times.

The operating LED will be blink­ing 10 times.

Keep operating state.

Keep operating state.

Restart compressor when Heat sink
Temp is 85°C below.

The operation is off(enable to restart
by remote controller).

Compressor will be turned off immediately.
(not enable to restart by remote controller)

Compressor will be turned off immediately.
(not enable to restart by remote controller)

Compressor will be turned off immediately.
(restart compressor when D-PIPE TH. is
recovred)

Malfunction indicator The operating state

2. The malfunction indicator of outdoor (see the LED01M on the outdoor PCB ass’y)

❈ Error code ➅, ➆ can’t be operated unless the power cord is removed.

2

4

5

6

7

2

4

5

6

7

9

D-PIPE TH is short or open. The LED01M will be blinking 10

times.

Compressor will be turned off immediately.
(restart compressor when D-PIPE TH. is
recovered)

10

10

Indoor fan lock error
(BLDC fan model)

The operating LED will be blink­ing 8 times.

The operation is off(enable to restart
by remote controller).

8

Outdoor fan lock error
(BLDC fan model)

The operating LED will be blink­ing 9 times.

The operation is off(enable to restart
by remote controller).

9

68 Room Air Conditioner

Troubleshooting Guide

■ Precaution in Service or Check

Even after stopping the operation of product, it takes some time to discharge the remaining electricity of the
electrolytic capacitor that was charged. Before starting a checking or repairing job, pull out the plug out of the
outlet and make sure that the lamp on the control board outdoor unit is off.

■ The Diagnosis Procedure

Check the supplied voltage to product (AC 220V/230V ± 30V).

Check the connecting cable between Indoor and Outdoor.

Check the blinking number of operation indicator

(refer to the self-diagnosis function).

Check the self-diagnosis table

• Check the condition of connectors

• The condition of P.C.B pattern.

• Check the condition of connectors.

• The condition of P.C.B pattern.

• The electronic components.

Indoor Outdoor

Service Manual 69

Troubleshooting Guide

Electronic Parts

❇ Refer to electronic contorol device drawing & schematic diagram.

The Product doesn’t operate at all.

Turn off the main power and wait to 10 seconds

Turn on the main power again.

Does "Beeping" sound is made from the indoor unit?

• Primarily, the operating condi­tion of Micom is O.K.

•

Check CN-DISP1

CN-DISP2 of indoor DC PCB

Check the voltage of power(AC220V/AC240V, 50Hz).

• The voltage of main power.

• The voltage applied to the unit.

• The connecting method of Indoor/Outdoor connecting cable (each color)

• The P.C.B. Ass'y

(Fuse, Noise Filter, Power Module, Bridge Diode, etc.)

Trouble 1

NO

YES

The operation check of the Indoor P.C.B. Ass'y

Procedure

1) The input voltage of power mod­ule.

2) The output voltage of power mod­ule.

4) IC04D(7805)

5) IC01A(KIA7036)

Specification

1) AC230V ± 30V
: Check the rated voltage

2) 12V ± 3V

4) DC5V

5) The voltage of micom pin 19
: DC4.5V↑

Remedy

1) Check the power outlet.

2) Replace
P.C.B Ass'y

4) Replace P.C.B Ass'y

5) Replace P.C.B Ass'y

70 Room Air Conditioner

Troubleshooting Guide

Turn on main power.

While the compressor has been stopped, the compressor does not operate

owing to the delaying function for 2 minutes after stopped.

When the compressor stopped Indoor Fan is driven by a low speed.

At this point the wind speed is not controlled by the remote controller.

(When operated in the Sleeping Mode, the wind speed is set to the low speed as force).)

Caused by the remote controller.

Caused by other parts except

the remote controller

When the mark ( ) is displayed in LCD

screen, replace battery.

Check the contact of CN-DISP 1, 2 connector

Check DISP P.C.B Ass'y

-Voltage between CN-DISP1 - : DC +5V

Check point

• Check the connecting circuit between
MICOM PIN and CN-DISP1 PIN

• Check receiver ass'y

Product doesn't operate with the remote controller.

Trouble 2

Service Manual 71

Troubleshooting Guide

Turn on the main power.

When in air circulation mode, compressor/outdoor fan is stopped.

Turn off main power.

Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.

Check the sensor for Indoor temperature is attatched as close as to be effected by the
themperature of Heat Exchange (EVA.)

When the sensor circuit for Indoor temperature and connector are in bad connection or are
not engaged, Compressor/Outdoor fan is stopped.

• Check the related circuit of R02H(12.1K), R01H(6.2K), R04H(1K), R03H(1K), C01H(102),
C02H(102), Micom(pin No. , ).

•

Check the Indoor temperature sensor is disconnected or not (Resistance is about 10K at 25°C).

Check the Relay(RY-PWR) for driving Compressor.

• Check the voltage between brown and blue cable of terminal to connect the Outdoor
(About AC220V / 240V).

• Check the related circuit of relay in Outdoor PCB Ass'y.

Operate Cooling Mode by setting the disired temperature of the remote controller is less
than one of the Indoor temperature by 1°C at least.

The Compressor/Outdoor Fan are unable to drive.

Trouble 3

Check Point

Between Micom(No. 46) and
GND

DC 5V DC 0V

DC 12VDC 1V↓

Between IC01M(No. 15) and
GND

Comp. ON Comp. OFF

72 Room Air Conditioner

Troubleshooting Guide

When indoor Fan does not operate.

Trouble 4

Check the SSR high speed operation by remote control.

(the Indoor Fan Motor is connected)

Turn off main power.

Check the connection of CN-MOTOR.

Check the Fan Motor.

Check the Fuse(AC250V, T2A).

Turn on the main power

Check the related circuit of indoor Fan Motor.

• The pin No.45 of micom and the part for driving SSR.

• Check the related pattern.

• Check the SSR.

- SSR Open: Indoor Fan Motor never operate.

- SSR short: Indoor Fan Motor always operates in case of ON or OFF.

The voltage of Pin No 1(orange) and 3(black) of CN-MOTOR.

About AC 180V over About AC 50V over

SSR is not damaged Check SSR

Service Manual 73

Troubleshooting Guide

• Confirm that the vertical louver is normally geared with the shaft of Stepping Motor.

• If the regular torque is detected when rotating the vertical louver with hands ⇒ Normal

• Check the connecting condition of CN-U/D Connector

• Check the soldering condition(on PCB) of CN-U/D Connector

Check the operating circuit of the vertical louver

• Confirm that there is DC +12V between pin ➀ of CN-U/D and GND.

• Confirm that there is a soldering short at following terminals.

- Between41,42,43and

44

of MICOM

- Between

4

,

5 , 6

and 7of IC01M

- Between

10, 11 , 12

and 13of IC01M

When the horizontal louver does not operate.

Trouble 5

If there are no problems after above checks.

• Confirm the assembly condition that are catching and interfering parts in the link of the
vertical louver

74 Room Air Conditioner

Turn off main power

Check the wire connection of PTC Heater (Refer to Wiring Diagram)

• Check the connecting condition of CN-PTC connector on the indor DC P.C.B Ass'y.

• Check the soldering condition of CN-PTC connector on the indoor DC P.C.B Ass'y.

Check the Heater driving Circuit.

• Check the pattern between MICOM Pin No.

48

→ IC02M Pin No.

7

→ IC02M Pin No.

10

→ CN-PTC

The heater does not operate at all.

Trouble 6

If there is no problem result of all above check.

• Inner side disconnection of PTC Heater unit or restriced operating condition of PTC Heater
(pipe temp. is over 45°C, defrosting operation, compressor off, indoor fan off).

Troubleshooting Guide

Service Manual 75

Does the Operating LED of indoor unit blink
when Operation's ON?

Is the Connection between indoor power
relay Pin ➂ and terminal block No. 1 right?

Refer to the self-diagnosis function.

The Outdoor Unit does not operate at all.

Trouble 7

YES

Check the connecting state of connector

NO

NO

Is the connection of cable between indoor
and outdoor unit right?

Indoor Outdoor

1(Brown) 1(Brown)
2(Blue) 2(Blue)
3(Green/YL) 3(Green/YL)
4(Red) 4(Red)

NO

YES

Is the voltage of Terminal Block , in
outdoor Control Box about AC220V /

240V?

Check the Fuse of Outdoor PCB Ass'y.

NO

YES

Is the voltage of NF01J ➀, ➁ in outdoor
PCB Ass'y about AC220V / 240V when

Operation's ON?

Check the PTC and RY-PWR.

NO

YES

Is the Bridge Diode(BD01S) right?

Check the Bring Diode.

NO

YES

Replace the PCB Ass'y.

NO

Troubleshooting Guide

76 Room Air Conditioner

Does the LED01M of outdoor PCB Ass'y
blink 6 times?

Check the state of connecting cable (3 line)
between indoor and outdoor uint.

When compressor does not operate normally.

■ DC Peak Error(Error Code ➅)

Trouble 8-1

NO

YES

Is the connecting state of connectors in out­door. PCB Ass'y right?
(CN-UVW)

• Electrical wiring diagram (Colors)

• Check the connecting state of connectors

in PCB Ass'y

• If CN-UWV is connected, the comprressor
can be operated a opposite direction.

NO

YES

Is the power module in PCB Ass'y right?

• Check the short P-N P-U, V, W, and N-U,
V, W of IPM and then collector, emiter of
IGBT

NO

YES

Is the voltage of T/Block , over than
AC150V?

Check the supplied voltage.

NO

YES

Is the voltage of GND-IPM(32 pin) over
than about DC280V?

• Check the DC voltage between IPM 1pin
GND

NO

YES

Is the refrigerant pressure right?

Replace the PCB Ass'y.

• Main PCB Ass'y

• Control Box Ass'y

Supply the refrigerant or Discharge refriger­ant.

NO

NO

Troubleshooting Guide

Service Manual 77

When compressor does not oprate normally.

■ Communication error between Indoor and Outdoor (Error Code ➄)

Trouble 8-2

Does the operating LED in display PCB
Ass'y blink 5 times?

• Check the state of connecting cable
(3 line) bewteen indoor and outdoor unit .

• Check Fuse, Noise Filter, PTC, etc.

NO

YES

Is the voltage of BR/BK, RD AC220/240V in
Main PCB Ass'y.

• Electrical wiring diagram(Colors)

• Check the connecting state

of connectors in outdoor PCB Ass'y

• Check the Fuse of outdoor PCB Ass'y.

NO

YES

Is the connection of CN-T/Block and in
CN-AC/DC indoor P.C.B Ass'y is right?

Replace the PCB Ass'y.

• Main PCB Ass'y (Indoor/Outdoor)

• Control Box Ass'y.

• Reconnect the connectors.

• Check the PCB pattern(Resoldering).

NO

YES

Troubleshooting Guide

78 Room Air Conditioner

When compressor does not oprate normally.

■ CT Error (Error Code ➆)

Trouble 8-3

Does the operating LED in Display PCB
Ass'y blink 7 times?

• Check the state of connecting cable
(3 line) bewteen Indoor and Outdoor Unit .

• Check fuse, Noise Filter, PTC, etc.

NO

YES

Is the courrent transformer(CT) in Main
PCB Ass'y right?

Check the PCB pattern(resoldering)

NO

YES

Is the indoor/outdoor fan locked?

Check the indoor/outdoor fan motor.

NO

YES

Is the discharge temperature of Indoor unit
right(11°C~17°C) in the cooling mode?

Check the compressor.

NO

YES

Is the refrigerant pressure right?

Supply the refrigerant or Discharge the
refrigerant.

NO

YES

Replace the PCB Ass'y.

• Main PCB Ass'y(Outdoor)

• Control Box Ass'y(Outdoor)

Troubleshooting Guide

Service Manual 79

■ The problem of missing the connector (INDOOR MAIN PCB ASSY)

■ The problem of missing the connector (OUTDOOR MAIN PCB ASSY)

Connectors

CN-AC/DC

CN-FAN

CN-DISP1

CN-T/Block

CN-DISP2

CN-TH

CN-U/D

Condition

OPEN

OPEN

OPEN

OPEN

OPEN

OPEN/SHORT

OPEN

• Malfunctions all indoor & outdoor unit.

• Malfunctions remocon, force, test operation mode.

•

Malfunctions remote contoller.

• Don't operate the power display module.

• Malfunctions outdoor unit.

• Stop compressor and outdoor fan motor.

• The operation LED blinks 5 times.

• Communication error.

•

Don't operate the power display module.

• The operation LED blinks twice.

• Enable to receive remote singnal.

• Malfunctions UP/DOWN step motor.

• Don't operate louver.

• Malfunctions indoor fan motor.

Problem (error mode)

Connectors

Condition

OPEN

OPEN

OPEN

• Stop compressor.

• Malfunctions 4-WAY valve.

• Malfunctions fan

Problem (error mode)

CN-TH

CN-UVW

CN-4 WAY

CN-FAN

CN-D-PIPE

OPEN/SHORT

OPEN/SHORT

• The operation LED blinks twice.

• The LED01M blinks twice.

• The LED01M blinks 10 times.

• Continue Comp. operation.

(when the discharge pipe TH opens)

• Stop Comp. operation
(when the discharge pipe TH shorts)

Troubleshooting Guide

80 Room Air Conditioner

Exploded View

Exploded View

346810

135516

352150

266090

267110

146811

131410

359011

342800

147581

268711-1

159830

135311

135312

249951

733010

152313

135314

152302

268714-1

268714-2

263230

264110

354210

W6640

W0CZZ

35211B

Indoor Unit

554032

437212

435511

552202

552116

552201

554160

561410

552113

550140

552203-1

552203-2

430410

649950

552102-1

437211

435301

559010

546810

437210

447910

263230-1

435512

268711

Outdoor Unit

552102-2

Exploded View

Service Manual 81

Replacement Parts List

Replacement Parts List

Indoor Unit

LOCATION

No.

131410 CHASSIS ASSMEBLY 3141A20006A 3141A20005A 3141A10002A 3141A10002A 3141A10002A R

135311 GRILLE ASSEMBLY, DISCHARGE(INDOOR) 3531A10232Z 3531A10192Y 3531A10231Z 3531A10231Z 3531A10116G R

135312 GRILLE ASSEMBLY, FRONT(INDOOR) 3531A24001D 3531A21018L 3531A21022G 3531A21022G 3531A20207C R

135314 GRILLE ASSEMBLY, INLET SUB - - - - 3531A20107Y R

135516 COVER ASSEMBLY, MOTOR 3551A20050P 3551A20050N 3551A20098B 3551A20098B 3551A20098B R

146811 MOTOR ASSEMBLY, STEP 4681A20055A 4681A20055A 4681A20055A 4681A20055A 4681A20055A R

152302 FILTER(MECH), A/C 5230A10005C 5230A20014A 5230A20001A 5230A20001D 5230A20001D R

152313 FILTER ASSEMBLY, DEODORIZER 5231A20032C 5231A20032C - 5231A20032M - R

159830 AIR CLEANER ASSEMBLY 5983A25005H 5983A10006X 5983A10006X 5983A10006X 5983A25002H R

159901-1 VANE HORIZONTAL 5990A10005A 5990A20007A 5990A20008A 5990A20008C 5990A20008A R

159901-2 VANE HORIZONTAL - - 5990A20009A 5990A20009A 5990A20009A R

249951 CONTROL BOX ASSEMBLY, INDOOR 4995A20267W 4995A20267X 4995A20267Y 4995A20267Z 4995A20522B R

263230 THERMISTER ASSEMBLY 6323A20004K 6323A20004K 6323A20004K 6323A20004K 6323A20004K R

264110 POWER CORD ASSEMBLY 6411A20046C 6411A20046D 6411A20046E 6411A20005P 6411A90032D R

DESCRIPTION

AS-W096QGG1 AS-W126RGH1 AS-W186TGH1 AS-W246TGH1 AS-W246TLG1

PART No.

REMARKS

266090 H.V ASSEMBLY 6609A10003U 6609A10003U 6609A10003P 6609A10003P 6609A10003P R

267110 REMOTE CONTROLLER ASSEMBLY 6711A20073U 6711A20091H 6711A20091H 6711A20091H 6711A20077D R

268712 PWB(PCB) ASSEMBLY, DISPLAY 6871A20254B 6871A20254B 6871A20254C 6871A20254C 6871A20254C R

268714-1 PWB(PCB) ASSEMBLY, MAIN(AC) 6871A20316B 6871A20316B 6871A20316F 6871A20316D 6871A20316D R

268714-2 PWB(PCB) ASSEMBLY, MAIN(DC) 6871A20317R 6871A20636B 6871A20636C 6871A20317Z 6871A20636E R

342800 BEARING 4280A20004A 4280A20004B 4280A20004B 4280A20004B 4280A20004B R

346810 MOTOR ASSEMBLY, INDOOR 4681A20062L 4681A20048R 4681A20003D 4681A20067C 4681A20067C R

35211B TUBE ASSEMBLY, TUBING 5211A21046H 5211A21046G 5211A30439E 5211AR7066T 5211AR7066T R

352150 HOSE ASSEMBLY, DRAIN 5251AR2575F 5251AR2575F 5251AR2575F 5251AR2575F 5251AR2575F R

354210 EVAPORATOR ASSEMBLY,FIRST 5421A10024B 5421A20086A 5421A20010D 5410A20010L 5421A20010L R

359011 FAN ASSEMBLY, CROSS FLOW 5901A20007E 5901A20007D 5901A20008A 5901A20008A 5901A20008C R

733010 PLATE ASSEMBLY, INSTALL 3301A10003A 1H00843A 3301A10002A 3301A10002A 3301A10002A R

W0CZZ CAPACITOR, DRAWING 3H01487K 3H01487A 3H01487G 3H01487G 3H01487G R

W6640 PWB(PCB) ASSEMBLY, MAIN(AC) 6871A20283P 6871A20283L 6871A20283Q 6871A20283M 6871A20283M R

NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.

(GCSC WEBSITE http://biz.LGservice.com)

82 Room Air Conditioner

Outdoor Unit

Replacement Parts List

LOCATION

No.

261704 TRANSFORMER, POWER 6170A20004A 6170A20004A 6170A20004A 6170A20004A 6170A20004A R

263230-1 THERMISTOR ASSEMBLY 6323A20001C 6323A20001C 6323A20001B 6323A20001B 6323A20001B R

263230-2 THERMISTOR ASSEMBLY 6323A20003G 6323A20003G 6323A20003C 6323A20003C 6323A20003C R

430410 BASE ASSEMBLY, WELD(OUTDOOR) 3041A20066A 3041A20066A 3041A20022R 3041A30003H 3041A30003H R

435301 GRILLE, DISCHARGE 3530A20006G 3530A20006B 3530A20007B 3530A20007B 3530A20007B R

435511 COVER ASSMEBLY, CONTROL(OUTDOOR) 3551A23001B 3551A30058Z 3551A30071H 3551A30071H 3551A30071H R

437210 GRILLE, ASSEMBLY, FRONT(OUTDOOR) 3721A20027Q 3721A20027H 3721A20005H 3721A20005H 3721A20005H R

437212 PANEL ASSEMBLY, REAR(OUTDOOR) 3721A20026M 3721A20026B 3720AP0003D 3720AP0003D 3720AP0003D R

447910 BARRIER ASSEMBLY,OUTDOOR 4791A30002G 4791A30002G 2H02110G 2H02110G 2H02110G R

546810 MOTOR ASSEMBLY, OUTDOOR 4681A20068G 4681A20068G 4681A20028R 4681A20028K 4681A20028K R

550140 ISOLATOR, COMP 4H00982E 4H00982E 4H00637A 4H00637A 4H00637A R

552102 TUBE, CAPILLARY BEND

552116 TUBE ASSEMBLY, REVERSING 5211A10465A 5211A10466A 5211A21140A 5211A30668B 5211A30668B R

DESCRIPTION

AS-W096QGG1 AS-W126RGH1 AS-W186TGH1 AS-W246TGH1 AS-W246TLG1

5210A31461A 5210A21447F 5210A31380D 5210A31380C 5210A31380C R

5210A21447F 5210A33068A 5210A31380E 5210A31380F 5210A31380F

PART No.

REMARKS

552201 VALVE,CHECK 3H01552F 3H01552F 5220A30004A 5220A30004A 5220A30004A R

552202 VALVE,REVERSING 5220AR3228F 5220AR3228F 5220AR3228E 5220AR3228E 5220AR3228E R

552111 TUBE ASSEMBLY, CAPILLARY 5211A30331Y 5211A21393A 5211A21382B 5211A21382A 5211A21382A R

552203-1 VALVE, SERVICE 5220A20001Q 5220A20006F 5220A20006A 5220A20013C 5220A20013C R

552203-2 VALVE, SERVICE 2H02479P 2H02479P 2H02479F 5220A20001R 5220A20001R R

554032 CONDENSER ASSEMBLY, BENT 5403A21004B 5403A20019V 5403A20022R 5403A20022R 5403A20022R R

554160 COMPRESSOR SET 5416A90028A 5416A90026A 5416A90024A 5416A90029B 5416A90029B R

559010 FAN ASSEMBLY, PROPELLER 5901A10033A 5901A10033A 1A00195B 1A00195B 1A00195B R

561410 COIL ASSEMBLY, REVERSING VALVE 6141AR3509J 6141AR3509J 6141A20010H 6141A20010H 6141A20010H R

649950 CONTROL BOX ASSEMBLY, OUTDOOR 4995A20203X 4995A20203Y 4995A20346B 4995A20346C 4995A20346C R

658740 REACTOR 3874A90003L 3874A90003L 3874A90003L 3874A90003L 3874A90003L R

NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.

(GCSC WEBSITE http://biz.LGservice.com)

Service Manual 83

P/No.: 3828A20195S

February, 2007

Printed in Korea