lg aircon - service manual

LGMulti Type Air ConditionerSERVICE MANUAL

LG

CAUTION

website http://www.lgservice.com

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

• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

MODEL• Indoor Unit:

• Outdoor Unit: L4UC488FA0

Floor Standing TypeLMNC246PRC2LMNC286PRC2LMNC366PRC2

Art Cool Deluxe TypeLMNC096DUR0LMNC126DUR0LMNC186D3R0

Room TypeLMNC096LRL0LMNC126LRL0LMNC186LTL0

2 Free Joint Multi Air Conditioner

Multi Air Conditioner Service Manual

TABLE OF CONTENTS

Safety Precautions......................................................................................................................................3

Details of LG Model Name..........................................................................................................................7

Product Specifications ...............................................................................................................................8

Combination Table ....................................................................................................................................10

Dimensions................................................................................................................................................11

Refrigeration Cycle Diagram....................................................................................................................14

Wiring Diagram..........................................................................................................................................15

Electronic Control Device.........................................................................................................................18

Schematic Diagram...................................................................................................................................22

Functions ...................................................................................................................................................26

Operation Details ......................................................................................................................................30

2-way, 3-way Valve ....................................................................................................................................35

Cycle Troubleshooting Guide ..................................................................................................................39

Electronic Parts Troubleshooting Guide.................................................................................................41

Exploded View & Replacement Parts List ..............................................................................................56

Service Manual 3

Safety Precautions

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions mustbe followed. Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is

classified by the following indications.

Meanings of symbol used in this manual are as shown below.

WARNING

CAUTION

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage.

WARNING Installation

Be sure not to do.

Be sure to follow the instruction.

Do not use a defective orunderrated circuit breaker.Use this appliance on a dedi-cated circuit.

• There is risk of fire or electric shock.

Do not let the air conditionerrun for a long time when thehumidity is very high and adoor or a window is left open.

• Moisture may condense and wet ordamage furniture.

Always ground the product.


Install the panel and the coverof control box securely.


Always install a dedicated cir-cuit and breaker.

• Improper wiring or installation maycause fire or electric shock

Use the correctly rated break-er or fuse.



Safety Precautions

Operational

Do not modify or extend thepower cable.


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

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

Be cautious when unpackingand installing the product.

• Sharp edges could cause injury. Beespecially careful of the case edgesand the fins on the condenser andevaporator.

For installation, always con-tact the dealer or anAuthorized Service Center.

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

Do not install the product on adefective installation stand.

• It may cause injury, accident, or dam-age to the product.

Be sure the installation areadoes not deteriorate with age.

• If the base collapses, the air condition-er could fall with it, causing propertydamage, product failure, and personalinjury.

Do not touch(operate) theproduct with wet hands.

• There is risk of fire or electrical shock.

Do not place a heater or otherappliances near the powercable.

• There is risk of fire and electric shock.

Do not allow water to run intoelectric parts.

• It may cause There is risk of fire, fail-ure of the product, or electric shock.

Service Manual 5

Safety Precautions

Do not open the inlet grille of the product dur-ing operation. (Do not touch the electrostaticfilter, if the unit is so equipped.)

• There is risk of physical injury, electric shock, or product fail-ure.

Be cautious that water could not enter theproduct.

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

Do not store or use flammable gas or com-bustibles near the product.

• There is risk of fire or failure of product.

If strange sounds, or smell or smoke comesfrom product. Turn the breaker off or discon-nect the power supply cable.

• There is risk of electric shock or fire.

Gasolin


Operational

Safety Precautions

Use two or more people to liftand transport the product.

• Avoid personal injury.

Use a soft cloth to clean. Donot use harsh detergents, sol-vents, etc.

• There is risk of fire, electric shock, ordamage to the plastic parts of the prod-uct.

Do not touch the metal partsof the product when removingthe air filter. They are verysharp!

• There is risk of personal injury.

Do not step on or put anyting on the product.(outdoor units)

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

Do not insert hands or other objects throughthe air inlet or outlet while the product is oper-ated.

• There are sharp and moving parts that could cause personalinjury.

CAUTION Installation

Wax Thinner

check for gas (refrigerant)leakage after installation orrepair of product.

• Low refrigerant levels may cause fail-ure of product.

Install the drain hose toensure that water is drainedaway properly.

• A bad connection may cause waterleakage.

Keep level even wheninstalling the product.

• To avoid vibration or water leakage.

90˚

Details of LG Model Name

Details of LG Model Name

Service Manual 7

Indoor Unit

Outdoor Unit

LMN C 612 RL L 0

Serial Number

Electrical Ratings

MPS Variable Multi System Indoor Unit

Model Type C : Cooling Only

Ex) 12,000 Btu/h '12', 18,000Btu/h '18'

Nominal Heating or Cooling Capacity in Btu/h

Electrical Rating6: 1Ø, 220~240V, 50Hz

Chassis Name

Indoor Unit TypeL : Wall Mounted T : Ceiling CassetteB : Ceiling Concealed Duct D : Art Cool DeluxeP : Floor Standing

FunctionA : Basic, L : Nano Plasma + Auto Clean(Wall Mounted)C: Plasma(Ceiling Cassette), G: Low Static MotorArt Cool Deluxe Type Front Panel ColorB: Blue, D: Wood, M: Metal, R: Mirror, W: White

R22 MPS Variable Multi System Outdoor Unit.And No. of Connectable Indoor Units

Ex) L4U : Connectable max. 4 Indoor Units

Model TypeC : Cooling Only

Ex) 48,000 Btu/h '48'

Nominal Cooling Capacity in Btu/h

8 : 3Ø, 220V, 50Hz

Multi Type

Function A : Basic

F : Free Joint Multi Type

0 : right type, 1 : left type

L4U C 48 8 F A 0


Product Specifications


1. Outdoor

ModelCooling Capacity Btu/hr

Wkcal/hr

Input Cooling/Heating WRunning Current Cooling/Heating AStarting Current Cooling/Heating APower Supply Ø,V,HzCompressor Type

O.L.P Type(model name)Refrigerant charge Charge g(oz)

TypeControl

Coil Tube Size (OD) inch(mm)Fins per inchNo. of Rows & Column/No.

Fan motor ModelOutput WCapacitor µF/Vac

Air Circulation Outdoor CMM(CFM)Noise Level(H/L) Sound Press,1m dB(A)±1SVC Valve Liquid inch(mm)

GasDimensions W*H*D inch(mm)Net Weight Outdoor kg(lbs)Power Supply Cable No.* mm2

Interunit Cable No.* mm2

48,00014,06712,0965,000

1014

3,380~415,50Rotaryinternal

4000(141.1) "at 7.5m"R22

L.E.V0.276(7.0)

182R,52C

IC28640LG28J120 * 26/370

53(1872) *258/54

1/4 (6.35)*4EA3/8 (12.7)*4EA

35.4*45.8*14.5 (900*1,165*370)105(231)

4*5.04*0.75 (Includes earth)

L4UC488FA0

Notes:-1. Capacities are based on the following conditions:

Cooling: - Indoor Temperature 27°C(80.6°F) DB /19°C(66.2°F) WB- Outdoor Temperature 35°C(95°F) DB /24°C(75.2°F) WB- Interconnecting Piping Length 7.5m- Level Difference of Zero.

2. Capacities are Net Capacities.3. Due to our policy of innovation some specifications may be changed without notification.4. : See the page "Combination Table"

Service Manual 9


2. Indoor

Indoor Unit Type

Model

Nominal Cooling Capacitykcal/hr(W)

Btu/hr

Air Circulation H/M/L CMM(CFM)

Setting temperature range(cool) °C

Fan motorOutput W

Capacitor µF/Vac

Noise LevelH/M/L dBA

(Sound Press,1.5m)

Temperature controller

Dehumidification Rate l/h

Dimensions (W*H*D) Body inch(mm)

Net Weight Body kg(lbs)

Liquid inch(mm)

Piping Connection Gas inch(mm)

Drain hose (ID Ø) mm

LMNC096LRL0 LMNC126LRL0 LMNC186LTL0 LMNC096DUR0 LMNC126DUR0 LMNC186D3R0

2267(2638) 3024(3517) 4536(5275) 2267(2638) 3024(3517) 4536(5275)

9,000 12,000 18,000 9,000 12,000 18,000

8.5(300) 9.0(318) 13(460) 8.5(300) 9.0(318) 13(460)

18~30 18~30 18~30 18~30 18~30 18~30

14.4 14.4 22 7.8 7.8 25.6

0.9/400 0.9/400 2.0/370 0.9/400 0.9/400 2/370

35/33/31 39/36/34 42/39/36 36/32/29 37/33/31 40/38/36

Thermistor Thermistor Thermistor Thermistor Thermistor Thermistor

1.4 1.8 2 1.2 1.5 2

35.4*11.2*6.1(900*285*156) 35.4*11.2*6.1(900*285*156) 42.9*12.4*6.8(1090*314*172) 40.6*11.4*6.0(1030*290*153) 40.6*11.4*6.0(1030*290*153) 46.1*24.4*6.81(1170*315*173)

8(17.6) 8(17.6) 12(26.5) 9.5(20.9) 9.5(20.9) 13(28.7)

1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35)

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

20 20 20 20 20 20

Wall Mounted Art Cool

Indoor Unit Type

Model

Nominal Cooling Capacitykcal/hr(W)

Btu/hr

Air Circulation H/M/L CMM(CFM)

Setting temperature range(cool) °C

Fan motorOutput W

Capacitor µF/Vac

Noise LevelH/M/L dBA

(Sound Press,1.5m)

Temperature controller

Dehumidification Rate l/h

Dimensions (W*H*D) Body inch(mm)

Net Weight Body kg(lbs)

Liquid inch(mm)

Piping Connection Gas inch(mm)

Drain hose (ID Ø) mm

LMNC246PRC2 LMNC286PRC2 LMNC346PRC2

6048(7034) 7056(8260) 8568(9964)

24,000 28,000 34,000

18.5/14/12/8(653/494/424) 20/16.5/13/8(706/583/459/283) 21/18/15.5/6(742/636/547/212)

18~30 18~30 18~30

47.4 102 82.8

2.5/440 4/450 2.5/440

46/45/44 48/47/46 50/49/48

Thermistor Thermistor Thermistor

2.1 3.2 3.8

22.4*71.7*12.5(570*1,820*317) 22.4*71.7*12.5(570*1,820*317) 22.4*71.7*12.5(570*1,820*317)

36(79) 36(79) 36(79)

1/4 (6.35) 1/4 (6.35) 1/4 (6.35)

5/8 (15.88) 5/8 (15.88) 5/8 (15.88)

16 16 16

PAC

Notes:-1. Capacities are based on the following conditions:

Cooling: - Indoor Temperature 27°C(80.6°F) DB /19°C(66.2°F) WB- Outdoor Temperature 35°C(95°F) DB /24°C(75.2°F) WB- Interconnecting Piping Length 7.5m- Level Difference of Zero.

2. Capacities are Net Capacities.3. Due to our policy of innovation some specifications may be changed without notification.4. : See the page "Combination Table"


Combination Table

Combination Table

L4UC488FA0

9 9 10 10 2200 4.112 12 12 12 2300 4.2

1 UNIT18 18 18 18 2400 4.424 24 24 24 2500 4.528 28 28 28 4600 8.334 34 34 34 4600 8.49 9 18 9 9 18 2400 4.59 12 21 9 12 21 2500 4.612 12 24 12 12 24 2600 4.79 18 27 9 18 27 4500 8.512 18 30 12 18 30 4700 8.69 24 33 9 24 33 4700 8.612 24 36 12 24 36 4800 8.618 18 36 18 18 36 4800 8.8

2 UNIT 9 28 37 9 28 37 4800 8.612 28 40 12 28 40 4900 8.718 24 42 18 24 42 4900 8.99 34 43 9 34 43 4900 8.612 34 46 12 34 46 4900 8.718 28 46 18 28 46 5000 8.924 24 48 24 24 48 5000 8.918 34 52 18 34 52 5100 8.924 28 52 24 28 52 5100 9.09 9 9 27 9 9 9 27 4600 8.69 9 12 30 9 9 12 30 4700 8.79 12 12 33 9 12 12 33 4800 8.89 9 18 36 9 9 18 36 4800 8.912 12 12 36 12 12 12 36 4900 8.99 12 18 39 9 12 18 39 4900 9.09 9 24 42 9 9 24 42 4900 9.012 12 18 42 12 12 18 42 5000 9.19 12 24 45 9 12 24 45 5000 9.1

3 UNIT 9 18 18 45 9 18 18 45 5000 9.29 9 28 46 9 9 28 46 5000 9.112 12 24 48 12 12 24 48 5100 9.112 18 18 48 12 18 18 48 5200 9.29 12 28 49 9 12 28 49 5100 9.19 18 24 51 9 18 24 51 5100 9.39 9 34 52 9 9 34 52 5100 9.212 12 28 52 12 12 28 52 5200 9.312 18 24 54 12 18 24 54 5200 9.418 18 18 54 18 18 18 54 5200 9.59 9 9 9 36 9 9 9 9 36 4800 9.09 9 9 12 39 9 9 9 12 39 4900 9.19 9 12 12 42 9 9 12 12 42 5000 9.29 9 9 18 45 9 9 9 18 45 5000 9.39 12 12 12 45 9 12 12 12 45 5100 9.3

4 UNIT 9 9 12 18 48 9 9 12 18 48 5100 9.412 12 12 12 48 12 12 12 12 48 5100 9.29 9 9 24 51 9 9 9 24 51 5100 9.49 12 12 18 51 9 12 12 18 51 5200 9.59 9 12 24 54 9 9 12 24 54 5200 9.512 12 12 18 54 12 12 12 18 54 5300 9.6

Combimation of Indoor unit(k Btu/h)Cooling

Each Capacity Input(W)

Current(A)Unit-A Unit-B Unit-C Unit-D Total Unit-A Unit-B Unit-C Unit-D Total

Operation

Unit

Service Manual 11

Dimensions

Dimensions

1. Indoor Unit

• RAC

Installation plate

D

H

W

Installation plate

Pipe See NoteDrain Hose

D

H

W

• DCR

Capacity W H DSQ Ch. 7K/9K 824 260 156SR Ch. 12K 900 285 156ST Ch. 18K/24K 1080 314 182

Model W H DLMN096DUR0

1030 290 153LMNC126DUR0LMNC186D3R0 1170 315 173

Dimensions


• PAC

No. Items1 Control Display2 Air outlet vent3 Air inlet vent4 Sliding Clean Door

4

1

3

2

1,82

0

570 311

Service Manual 13

Dimensions

L6L7 L8L9

L4

H

L5

W

D L1

L3

L2

L10

L11L

11L1

1L1

1L1

1L1

1L1

1

Gas side3-way valve

Liquid side2-way valve

W mm 870

H mm 1038

D mm 320

L1 mm 360

L2 mm 340

L3 mm 25

L4 mm 1035

L5 mm 25

L6 mm 546

L7 mm 160

L8 mm 160

L9 mm 44

L10 mm 64.5

L11 mm 50

L4UC488FA0MODEL

DIM

2. Outdoor UnitL4UC488FA0


Refrigeration Cycle Diagram

Refrigeration Cycle Diagram

L4UC488FA0

Indoor Side Outdoor Side

B A

COMP BCOMP AA

ccum

.CD

ex)

Solenoid Valve

L.E.V

3-Way Valve

2-Way Valve

Capillary

Service Manual 15

Wiring Diagram

Wiring Diagram

Indoor Unit

1. LMNC096LRL0, LMNC126LRL0, LMNC186LTL0

2. LMNC096DUR0, LMNC126DUR0, LMNC186D3R0

3854A20135W

CN

-TH

1

THERMISTOR(OUT-PIPE)

THERMISTOR(IN-PIPE)

THERMISTOR(ROOM)

CN

-TH

2C

N-U

/D

CN

-MO

TOR

CN

-PO

WE

R

AC PCB ASM DC PCB ASM

FUSE250V 2A

ZNR

Wiring Diagram


3. LMNC246PRC2,LMNC286PRC2,LMNC366PRC2

Service Manual 17

Wiring Diagram

Outdoor Unit1. L4UC488FA0


Electronic Control Device


Indoor Unit

LMNC096LRL0, LMNC126LRL0, LMNC186LTL0

• MAIN P.C.B AC ASM

Service Manual 19


LMNC096DUR0, LMNC126DUR0, LMNC186D3R0

• MAIN PCB ASM - TOP VIEW

• MAIN PCB ASM - BOTTOM VIEW

C06J

EARTH

FUSE

IC03D

R01J

CN_M

OT

OR

IC01K IC02K

IC01J

R02JR0

3J TR01J

JP31

NF02J

R05K

D01K

D02K

ZN

R02J

CN_P

OW

ER

JP28

JP29

C03J

C04J

JP33 CN_L/R(BL)

C06D

CN_U/D(WH)

Q01C

Q01V

BD01D

D02D

+

~

C05D

D05D

~

-

IC01D

IC02DZ

D02D

JP38

JP35

SD01D

C01J

NF01J

ZNR01J

NTCJP30

C05J

250V/T2A

7

1

CN_CC

BZ01E

C01E

C01D

JP4

0

JP39

4

3

SMPS

JP34

D07D

L1

JP1

JP4

1

JP4

2

ASM

: 68

71A

1011

1

PCB

: 687

0A90

120C

IC1

JP19

C02A IC01A

JP50 JP53

JP4

9

OSC01B

JP52

JP51

JP12

JP56

JP54

JP55

CN_HVB(BL)

IC04D

C04D

C09D

JP4

4

CN_SUC(WH)

JP43

CN_TH1

JP4

5

JP58

JP4

8

JP46

CN_VFD(WH)JP11

CN_CON(BL)

JP47

CN_TH2

JP32

C06J

IC03D

C04J

CN

-MO

TO

R

R03

J

JP13 C01K R01KR04D JP6JP7

R02

KR

04K

Q01

KR

05K

IC02K IC01K

R04

J

JP31

IC01J

R03

K

D02

KD

01K

NF02J

ZNR02J

TR01J

CN

-PO

WE

R

R01J

JP28

JP29

C03

J

JP33

CN-U/D(WH)

JP12

CN

-CO

N(B

L)

C06D

Q01

C

JP9

JP2

C01

L

JP22

BC01D

R05

D

R02

J

D02

D

R06

D

C02

D

D05

D

R05

VJP

26

R02

DR

03D

R06

VJP

15

C05D

ZD

02D

IC02D

IC01D

JP36

JP24

JP21

JP37

Q02

V

R04

E

R08

DJP

17

JP18

JP38

C01D

SMPS

SD01D

JP35

ZNR01J

JP30

NF01J

C01J

NTC

C05J

EARTH

CN-CC

FUSE

250V/T2A

R23

G

R21

G

R22

G

R24

G

C10

DQ

03E

Q01

E

R01

ER

02E

JP25

Q02

ER

02L

R03

E

C01E

JP40

JP39

JP5 JP

27

JP34IC04M

L1

D07

D

JP1

30

JP49

JP10

JP8

R01

L

R01P

R07

D

JP41

Q01

V

IC1

JP42

JP23

JP14

C01AR01A

R02AJP50

IC01A

20

25

JP54

JP53

JP52

JP51

OR2H

L01X

L02X

R01

B 10

15

JP19

C01

X

C01

GR

01G

JP56

JP55

CN-HVB(BL)

R01

FR

02F

C07

D

C08D

C04D

C09D

MICOM

JP44

IC04

D

40

45

IC01M

JP43

IC02M

JP57

CN-SUC(WH)

C01

HC

04V

R06

H

JP45

1

50

55

JP58

R01

HR

02H

R03

V

R04

VR

05H

R21

H

R22

HR

23H

C03V

C02H

JP48

JP47

JP46

CN-VFD(WH)

C01

F

CN-TH1

JP4

OR

1HO

R3H

R02

GJP

3JP

16

C03

HR

03H

R04

H

CN-CH2

JP20JP32

CN-L/R(BL)



LMNC246PRC2, LMNC286PRC2, LMNC366PRC2

• MAIN PCB ASM

Service Manual 21


L4UC488FA0

• MAIN P.C.B ASM

Outdoor Unit

Display P.C.B ASM

SEJIN ELECTRON INC. SVM-GP1119AI P/N 3210018043

1

REV1

C13

C7

C8

C9

D1

Q1

Q2R9

R13

R2 R6

R7R8

R10

TP1

TP2

TP3TP4

R17

R18

R19

C14C15

C18

R4 R3

TP5

TP6

M42

M43 C19

C20

C21

R5

M45M44

Art Cool Deluxe TypeTOP VIEW

BOTTOM VIEW

TP1TP2

TP3TP4

TP7

TP8

All of M/S SW 1, 2, 3, 4 must be on 'M'


Schematic Diagram

Schematic Diagram

Indoor Unit

1. LMNC096LRL0, LMNC126LRL0, LMNC186LTL0

Service Manual 23

Schematic Diagram

2. LMNC096DUR0, LMNC126DUR0, LMNC186D3R0

Schematic Diagram


3. LMNC246PR30, LMNC286PR30, LMNC366PR30

Service Manual 25

Schematic Diagram

Outdoor Unit• L4UC488FA0


Functions

Functions

• Room temperature sensor. (THERMISTOR)

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

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

• Restarting is inhibited for approx. 3 minutes.

• High, Med, Low, CHAOS, JET COOL

• Refer to 37 page signal receptor.

• Intermittent operation of fan at low speed.

• The fan is switched to low(Cooling), med(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 swingup and down automatically.

Indoor Unit

Operation ON/OFF by Remote controller

Sensing the Room Temperature

Room temperature control

Starting Current Control

Time Delay Safety Control

Indoor Fan Speed Control

Operation indication Lamps (LED)

Soft Dry Operation Mode

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

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

• Both the indoor and outdoor fan stops dur-

ing defrosting.

• The indoor fan stops until theevaporator pipe temperature will be reachedat 28°C.

Sleep Mode Auto Control

Natural Air Control by CHAOS Logic

Airflow Direction Control

Defrost(Deice) control (Heating)

Hot-start Control (Heating)

PLASMA

Service Manual 27

Functions

Remote Controller

JET COOL

Healthy Dehumidification Operation Mode.( )

Operation Mode Selection

(Cooling model only)

Cooling Operation Mode.( ) Auto Operation Mode.( )

Sleep Operation

Fan Operation Mode

Room, Temperature Display

Setting the Time or Timer


Operation ON/OFF

Temperature SettingTEMPERATURE LOWHIGH

Timer SelectionON OFF

Timer SettingSET

Timer CancelCANCEL

Reset

Fan Speed Selection

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

: (High: 39°C LOW : 11°C)

Down to 18°C

Up to 30°CCooling

: OFF, ON, OFF ON

: Cancel Sleep Mode, Timer ON or Timer OFF

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

: Fan Operates without cooling or heating.


Functions

Healthy Dehumidification Operation Mode.( )

Art Cool Deluxe Type Remote Controller

Operation ON/OFF

Reset

Operation Mode Selection

Temperature Setting

Timer Selection

Timer Setting

JET COOL

Timer Cancel

Sleep Operation


(Cooling model only)

TEMPERATURE LOW HIGH

Cooling Operation Mode.( ) Auto Operation Mode.( )

Air Circulation

Horizontal Airflow Direction Control Button(Optional)

Room, Temperature Checking

Setting the Time or Timer

Fan Speed Selection

(Low) (Med) (High)

ON OFF

CANCEL

SET

2nd F

: (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

: Fan Operates without cooling or heating.

Cooling Down to 18°CUp to 30°C

Heating Down to 16°CUp to 30°C

Service Manual 29

Functions

ON OFF

SET CANCEL

910

12

11

6

13

78

14

5

12

4

3

Cooling Operation

Auto Operation

Soft dry operation

Flip-up door(closed)

1. START/STOP BUTTONOperation starts when this button is pressedand stops when the button is pressed again.

2. ROOM TEMPERATURE SETTINGBUTTONSUsed to select the room temperature.

3. INDOOR FAN SPEED SELECTORUsed to select fan speed in three steps low,high, super high.

4. TURBO-ZUsed to start or stop the speed cooling. (Speed cooling operates super high fan speed in cooling mode.)

5. PLASMA AIRPURIFYING BUTTON

6. ON/OFF TIMER BUTTONSUsed to set the time of starting and stoppingoperation.

7. TIME SETTING BUTTONSUsed to adjust the time.

8. TIMER SET/CANCEL BUTTONSUsed to set the timer when the desired time isobtained and to cancel the Timer operation.

9. SIMPLE OFF TIMER SET BUTTONEach time the button is pressed, the mode ischanged in the following process.Time set (0, 1, 2, 3, 4, 5, 6, 7 hrs)If you select "0", Timer function will be Cancel.

10. ENERGY SAVING OPERATION BUTTON

11. RESET BUTTONUsed prior to resetting time or after replacingbatteries.

12. AUTO AIRFLOW DIRECTION CONTROLBUTTONThe horizontal louvers swing up and down.

13. OPERATION MODE SELECTION BUTTONUsed to select the operation mode.Cooling,Auto-operation,Soft dry Operation

14. AUTO AIRFLOW DIRECTION CONTROLBUTTONThe vertical louvers swing right and left.

Floor Standing Type Remote Controller


Operation Details

Operation Details

Main Unit Function1) C/O Model

Operation 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)

Sleep Timer Indicator• On while in sleep timer mode, off when sleep timer cancel or appliance operation pause

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

Comp. Running Incidator• While in appliance operation, on while in outdoor unit compressor running, off while in compressor off

Cooling Mode Operation• When the intake air temperature reaches 0.5°C below the setting temp, the compressor and the outdoor fan

stop.• When it reaches 0.5°C above the setting temp, they start to operate again.

Compressor ON Temp Setting Temp+0.5°CCompressor OFF Temp Setting Temp-0.5°C

• While in compressor running, operating with the airflow speed set by the remote control. While in compressornot running, operating with the low airflow speed regardless of the setting.

Healthy Dehumidification Mode• When the dehumidification operation input by the remote control is received, the intake air temperature is

detected and the setting temp is automatically set according to the intake air temperature.26°C ≤ Intake Air Temp 25°C24°C ≤ Intake Intake Air Temp<26°C Intake Air Temp-1°C18°C ≤ Intake Intake Air Temp<24°C Intake Air Temp-0.5°CIntake Air Temp<18°C 18°C

• While in compressor off, the indoor fan repeats low airflow speed and pause.• While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification

operation and 4-min compressor off repeat.Compressor ON Temp. Setting Temp+0.5°CCompressor OFF Temp. Setting Temp-0.5°C• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.

Service Manual 31

Operation Details

Fuzzy Operation (C/O Model)• According to the temperature set by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting

temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on.Compressor ON Temp Setting Temp + 0.5°CCompressor OFF Temp Setting Temp + 0.5°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to theintake air temp at that time.26°C ≤ Intake Air Temp 25°C24°C ≤ Intake Air Temp < 26°C Intake Air Temp + 1°C22°C ≤ Intake Air Temp < 24°C Intake Air Temp + 0.5°C18°C ≤ Intake Air Temp < 22°C Intake Air TempIntake Air Temp<18°C 18°C

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

• While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to thetemperature.

3. Display Ass'y


Operation Details

Off-Timer Operation• When the set time is reached after the time is input by the remote control, the appliance stops operating.• The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached.• If the appliance is on pause at the time set by the timer, the pause continues.

Off-Timer ↔ On-Timer Operation• When the set time is reached after the on/off time is input by the remote control, the on/off-timer operation is

carried out according to the set time.

Sleep Timer Operation• When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appli-

ance operation, the operation of the appliance stops.• While the appliance is on pause, the sleep timer mode cannot be input.• While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature

increases by 1°C. After another 30 min elapse, it increases by 1°C again.• When the sleep timer mode is input while in cooling cycle mode, the airflow speed of the indoor fan is set to

the low.• When the sleep timer mode is input while in heating cycle mode, the airflow speed of the indoor fan is set to

the medium.

Chaos Swing Mode• By the Chaos Swing key input, the upper/lower vane automatically operates with the Chaos Swing or they are

fixed to the desired direction.• While in Chaos Swing mode, the angles of cooling and heating cycle operations are different.

Chaos Natural Wind Mode• When the Chaos Natural Wind mode is selected and then operated, the high, medium, or low speed of the air-

flow mode is operated for 2~15 sec. randomly by the Chaos Simulation.

CLOSED

OPEN

< Cooling Mode >

7°

Service Manual 33

Operation Details

Jet Cool Mode Operation (C/O Model)• If the Jet Cool key is input at any operation mode while in appliance operation, the Jet Cool mode operates.• In the Jet Cool mode, the indoor fan is operated at super-high speed for 30 min at cooling mode operation.• In the Jet Cool mode operation, the room temperature is controlled to the setting temperature, 18°C• When the sleep timer mode is input while in the Jet Cool mode operation, the Jet Cool mode has the priority.• When the Jet Cool key is input, the upper/lower vanes are reset to those of the initial cooling mode and then

operated in order that the air outflow could reach further.

Forced Operation• Operation procedures when the remote control can't be used.• The operation will be started if the power button is pressed.• If you want to stop operation, re-press the button.

• While in forced operation, the key input by the remote control has no effect and the buzzer sounds 10 times toindicate the forced operation.

Test operation• During the TEST OPERATION, the unit operates in cooling mode at high speed fan, regardless of room tem-

perature and resets in 18±1 minutes.• During test operation, if remote controller signal is received, the unit operates as remote controller sets.

If you want to use this operation, open the front panel upward and Press the power button let it be pressed forabout 3 seconds.

• If you want to stop the operation, re-press the button.

Auto restart• In case the power comes on again after a power failure, Auto Restarting Operation is the function to operate

procedures automatically to the previous operating conditions.

Air Cleaner Operation• When an air cleaner function is selected during Air Conditioner operation

- Plasma air cleaner 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.

• When an air cleaner function is selected during operation off- The function will be only operated.

• When inlet grille of air conditioner is opened during plasma operation, High Voltage Generator(H.V.B) is to bestopped. When inlet grille of air conditioner is closed during plasma operation, High Voltage Generator(H.V.B)will be operated again.

Cooling Model

Operating mode Cooling

Indoor FAN Speed High

Setting Temperature 22°C


Operation Details

Remote Control Operation Mode• When the remote control is selected by the slide switch on the main unit, the appliance operates according to

the input by the remote control.

Protection of the evaporator pipe from frosting• If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause while in cool-

ing cycle operation mode, the compressor and the outdoor fan are turned off in order to protect the indoorevaporator pipe from frosting.

• When the indoor pipe temp is 7°C or higher after 3 min. pause of the compressor, the compressor and theoutdoor fan is turned on according to the condition of the room temperature.

Buzzer Sounding Operation• When the appliance-operation key is input by the remote control, the short "beep-beep-" sounds.• When the appliance-pause key is input by the remote control, the long "beep—" sounds.• When a key is input by the remote control while the slide switch on the main unit of the appliance is on the

forced operation position, the error sound "beep-beep-beep-beep-beep-" is made 10 times to indicate that theremote control signal cannot be received.

Service Manual 35

2-way, 3-way Valve

2-way, 3-way Valve

3.

2.

1.

4.

5.

Flare nut

To piping connection

Open positionClosed position

Flare nut

Valve cap

To piping connection

Open positionClosed position

Hexagonal wrench(4mm)

To outdoor unit

Pin

Service port

Service port cap

To outdoor unit

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

Works

Shipping

Pumping down(Transfering)

Closed(clockwise)

Open(counter-clockwise)

Open(connected manifold gauge)

Evacuation(Servicing)

Open OpenOpen

(with charging cylinder)

Gas charging(Servicing)

Open OpenOpen


Pressure check(Servicing)

Open OpenOpen


Gas releasing(Servicing)

Open OpenOpen


Closed(with valve cap)



Shaft position Shaft position Service port


2-way, 3-way Valve

• Procedure1. Confirm that both the gas side and liquid side

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 operatethe valve stems.

2. Operate the unit for 10 to 15 minutes.

3. Stop operation and wait for 3 minutes, then con-nect the manifold gauge to the service port ofthe gas side valve.- Connect the hose of the gauge with the push

pin to the service port.

4. Air purging of the charge hose.- Open the Low-handle valve on the gauge

slightly to air purge from the hose.

5. Set the liquid side valve to the closed position.

6. Operate the air conditioner at the cooling cycleand stop it when the gauge indicates 1kg/cm2g.

7. Immediately set the gas side valve to the closedposition.- Do this quickly so that the gauge ends up indi-

cating 1kg/ g.

8. Disconnect the charge set, and mount the liquidside and gas side valve caps and the serviceport nut.- Use torque wrench to tighten the service port

nut to a torque of 1.8kg.m.(4.2kg*m/5.5kg*m)

- Be sure to check for gas leakage.

Indoor unit

Outdoor unit

Liquid side

Close

Gas side

2-Wayvalve

Open3-Wayvalve

manifold gauge

Indoor unit Liquid side

Close

Gas side

2-Wayvalve

Open3-Wayvalve

Hi- handle(CLOSE)

Low-handle(CLOSE)

(1) Pumping down

Service Manual 37

2-way, 3-way Valve

(2) Evacuation(All amount of refrigerant leaked)

• Procedure1. Confirm that both the liguid side valve and gas

side valve are set to the opened position.

2. Connect the vaccum pump to the center hose ofthe manifold gauge.

3. Connect the service port of the gas side valve tothe low side of the gauge.

4. Connect power supply to outdoor unit.5. Evacuation for approximately one hour.

- Confirm that the gauge needle has movedtoward-76 cmHg (vacuum of 4 mmHg or less).

6. Close the Low handle of the gauge turn off thevacuum pump, and confirm that the gauge nee-dle does not move(approximately 5 minutesafter turning off the vacuum pump).

7. Disconnect the charge hose from the vacuumpump.- Vacuum pump oil.

If the vacuum pump oil becomes dirty or deplet-ed,replenish as needed.

8. Mount the valve caps and the service port caps.

Indoor unit

Outdoor unit

Liquid side

Open

Gas side

2-Wayvalve

Open3-Wayvalve

manifold gauge


Open

Gas side

2-Wayvalve

Open3-Wayvalve

Vacuum pump

Hi- handle(OPEN)

Low-handle(OPEN)


2-way, 3-way Valve

(3) Gas Charging(After Evacuation)

• Procedure1. Connect the gauge to the charging cylinder.

- Connect the charge hose which you disconnect-ed from the vacuum pump to the valve at thebottom of the cylinder.

- If you are using a gas cylinder, also use a scaleand reverse the cylinder so that the system canbe 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 purgethe air. (Be careful of the liquid refrigerant). Theprocedure is the same if using a gas cylinder.

3. Open the low handle on the gauge and chargethe system with liquid refrigerant.- If the system can not be charged with the speci-

fied amount of refrigerant, it can be chargedwith a little at a time (approximately 150g eachtime) while operating the air conditioner in thecooling cycle; however, one time is not suffi-cient, wait approximately 1 minute and thenrepeat the procedure(pumping down-pin).

4. Immediately disconnect the charge hose fromthe gas side valve's service port.

- Stopping partway will allow the gas to be dis-charged.

- If the system has been charged with liquidrefrigerant while operating the air conditionerturn off the air conditioner before disconnectingthe hose.

5. Mount the valve stem nuts and the service portnut.- Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.(4.2kg.m/5.5kg.m.)- Be sure to check for gas leakage.

manifold gaugeChargingcylinder

Hi- handle(OPEN)

Low-handle(OPEN)Check valve

Indoor unit

Outdoor unit

Liquid side

Open

Gas side

2-Wayvalve

Open3-Wayvalve


Open

Gas side

2-Wayvalve

Open3-Wayvalve

This is different from previous procedures.Because you are charging with liquid refrigerantfrom the gas side, absolutely do not attempt tocharge with larger amounts of liquid refrigerantwhile operating the air conditioner.

Service Manual 39

Cycle Troubleshooting Guide

Trouble analysis1. Check temperature difference between intake and discharge air, and operating current.

All amount of refrigerant leaked out.Check refrigeration cycle.

Refrigerant leakageClog of refrigeration cycleDefective compressor

Excessive amount of refrigerant

Normal

Notice:Temperature difference between intake and discharge air depends on room air humidity. When the room airhumidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lowertemperature difference is larger.

2. Check temperature and pressure of refrigeration cycle.

Notice:1. The suction pressure is usually 8~12 kg/cm2G at normal condition.2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with

putty.

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

rated current

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

rated current

Temp. difference : less than 8°CCurrent : near the rated

current

Temp. difference : over 8°C

Temp. Difference

Operating Current

Suction pressure Temperature(Compared with (Compared with Cause of Trouble Description

the normal value) the normal value)

High Defective compressor Current is low.

Normal Excessive amount of High pressure does not quicklyrefrigerant rise at the beginning of operation.

Insufficient amount ofLower Higher refrigerant(Leakage) Current is low.

Clogging

Higher




1) Comp basic step.

Free joint outdoor unit has two compressor (MPS: Multi power system)

If overload Max. capacity, display error code in indoor unit.

2) Capacity Vs Step

cf) Max. Capacity : 54k

Step Step 0 Step 1 Step 2 Step 3 Step 4

Operating Comp. Off 1 1 2 2

By-pass Off On Off On Off

Q2 = 0 Q2 ≤ 12k Q2 ≤ 24k Q2 ≤ 36k 36k < Qs

Step Step 0 Step 1 Step 2 Step 3 Step 4

Service Manual 41

Electronic Parts Troubleshooting Guide


1. The Outdoor Unit does not operate at all

Does the Operating LED of indoor unit blinkwhen Operation’s ON?

Refer to the self-diagnosis function.

NO

NO

Is the Connection between CN-Power of indoorunit and terminal block?

Check the connecting state of connector

NO

YES

Is the voltage of CN-POWER in outdoorPCB Ass’y about AC220V / 240V?

Check the main power

NO

YES

Check the Fuse of outdoor PCB Ass’y.Chek the connecting state of wires

Replace the PCB Ass’y.

NO

Is the connection of cable between indoor andoutdoor unit ringht?

Indoor Outdoor

1(L)(Brown) 1(L)(Brown)

2(N)(Blue) 2(N)(Blue)

(Green/YL) (Green/YL)

3(Red) 3(Red)

NO

YES

* TPS units start at three minutes after main power turning on.



2. The product is not operate with the remote controller.

Turn on Main Power

While the compressor has been stopped, the compressor does notoperate owing to the delaying function for 3 minutes after stopped.

Caused by other parts except the remote controllerCaused by the remote controller

When the mark( ) is displayed in LCD screen, replacebattery.

Check the contact of CN-DISP1 connector.

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 thelow speed by force.)

Check DISP PWB Ass'y- Voltage between CN DISP1 - : DC +5V

When the detect switch(double key) inside the remotecontroller door is fault, it is impossible to operatetemperature regulating( / ) and wind speed selecting.

Replace remote controller Check point

• Check the connecting circuit between PIN -R01L(1K) - C01L(680PF) - MICOM PIN

• Check Receiver Ass'y

Service Manual 43


3. When cooling does not operate

Turn on Main Power

Operate "Cooling Mode( )" by setting the desired temperature of theremote controller is less than one of the indoor temperature by 1°C at least.

When in Air Circulation Mode, Compressor/Outdoor Fan is stopped.

Check the sensor for indoor temperature is attached as close as to beeffected by the temperature of Heat Exchanger(EVA).

When the sensor circuit for indoor temperature and connector are in badconnection or are not engaged, Compressor/Outdoor Fan is stopped.

• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 25°C).

Check Relay(RY - COMP) for driving compressor.

• When the power(About AC220V/240V) is applied to the connecting wireterminal support transferred to compressor, PWB Ass'y is normal.

• Check the circuit related to the relay.

Check point COMP ON COMP OFF

Below DC 1VAbout DC12V(app)

Between two pin of DCpart in relay for COMP



4. When indoor Fan does not operate

Check the SSR high speed operation by remote control.(The Indoor Fan Motor is connected)

Turn off Main power

Check the connection of CN-FAN or CN-MOTOR

Check the Fan Motor

Check the Fuse(AC250V/T2A)

Turn ON Main Power

Check the related circuit of indoor Fan Motor.

• The pin of Micom, and the part for driving SSR• Check the 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(blue) and 3(yellow) of CN-FAN or CN-MOTOR.

About AC 160V over About AC 50V over

SSR is not damaged SSR Check

Service Manual 45


5. When Vertical Louver does not operate

• Confirm that the Vertical Louver is normally geared with the shaft ofStepping Motor.

• If the regular torque is detected when rotating the Vertical Louver withhands Normal

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

If there are no problems after above checks

• Confirm the assembly conditions that are catching and interfering partsin the rotation radial of the Vertical Louver

Check the operating circuit of the Vertical Louver

• Confirm that there is DC +12V between pin (RED) of CN-U/D andGND.

46 Multi type Air Conditioner

Error Indicator

• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.• After error occurrence, if error is released, error LED is also released simultaneously.• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.• Having or not of error code is different from Model.

Troubleshooting Guide

Self-diagnosis Function

Indoor Error

Error code DescriptionMPS

VariableLED 1(Red)

LED 2(Green)

IndoorStatus

00 No Error ON

01 Indoor Room themistor error 1time OFF

02 Indoor in-piping sensor error 2times OFF

03 Remote controller error 3times OFF

04 Drain Pump error 4times OFF

05 Communcation error between in and out 5times OFF

06 Indoor Out-Piping sensor error 6times OFF

07 Differnt mode operation 7times OFF

Outdoor Error

Error Code DescriptionMPS

VariableLED 1(Red)

LED 2(Green)

IndoorStatus

21 DC Peak (IPM Fault) 2times 1time OFF

22 CT 2(Max CT) 2times 2times OFF

23 DC Link Low Volt. 2times 3times OFF

24 L_P/Heater Sink 2times 4times OFF

25 Low voltage / Over voltage 2times 5times OFF

26 DC Comp Position Error 2times 6times OFF

27 PSC Fault Error 2times 7times OFF

28 DC Link High Volt 2times 8times OFF

32 D-Pipe High (INV) 3times 2times OFF

33 D-Pipe High (Normal) 3times 3times OFF

40 CT Sensor (Open/Short) 4times O OFF

41 INV. D-PipeTh Error(Open/Short) 4times 1time OFF

44 Outdoor air Th Error(Open/Short) 4times 4times OFF

45 Cond. Pipe Th Error(Open/Short) 4times 5times OFF

46 Suction Pipe Error(Open/Short) 4times 6times OFF

47 Const D-pipe Th Error(Open/Short) 4times 7times OFF

51 Capacity over 5times 1time OFF

54 Riversed phase 5times 3times OFF

60 EEPROM Check Sum Error 6times O OFF

61 Cond. Pipe High 6times 1time OFF

62 Heatsink High 6times 2times OFF

63 Cond. Pipe Low 6times 3times OFF

65 Heatsoml Th error (Open/Short) 6times 5times OFF

Service Manual 47


General Information

Error Indicator (Indoor)

• The function is to self-diagnosis air conditioner and express the troubles if there is any trouble.• Error mark is displayed on display window of indoor units and wired-remote controller, and LED of outdoor unit

control board.• If more than two troubles occur simultaneously, lower number of error code is first displayed.• After error occurs, if error is released, error LED is also released simultaneously.

Indoor Error

1 digit 10 digit

Case of errorContentsErrorcode

Open / ShortOutlet pipe sensor06

Different operation modeDifferent operation mode07

Communication Poorly

Float switch Open

Communication Poorly

Open / Short

Open / ShortAir sensor (open/short)01

Inlet pipe sensor02

Communication(Indoor ↔ Wired R/Control)03

Drain pump/ Float switch04

Communication(Indoor ↔ Outdoor)05

Off

Off

Off

Off

Off

Off

Off

Indoor

Status



Error Indicator (Outdoor)

Outdoor Error

Case of errorLED02G(Green)

LED01G(Red)Contents

Errorcode

Off

Open / Short

Open / Short

Open / Short

Open / Short

Over load combination

Off

Discharge Pipe Temp. High(cons.)

Air sensor (open/ short)

Cond. Pipe sensor (open/ short)

Suction pipe sensor (open/ short)

D-pipe sensor Cons. (open/ short)

Over capacity

Reiversed phase (Voltage)

33

44

45

46

47

51

54

Off

Off

Off

Off

Off

Off

Off

OutdoorStatus

3 times

4 times

4 times

4 times

4 times

5 times

5 times

3 times

4 times

5 times

6 times

7 times

1 times

4 times

Service Manual 49


1) Troubleshooting CH01, CH02, CH06

Ω

10kΩ

Check the resistance Check the voltage

V

2.5Vdc

01

02

06

Indoor air sensor

Indoor inlet pipe sensor

Indoor outlet pipe sensor

• Open / Short• Soldered poorly• Internal circuit error



Normal resistor : 10KΩ/ at 25°C (Unplugged)Normal voltage : 2.5Vdc / at 25°C (plugged)



Displaycode

Title Cause of error Check point & Normal condition

Check Point1. Unplug the sensor on Indoor unit PCB.

2. Estimate the resistance of each sensor.

3. If the resistance of the sensor is 10KΩ/ 5KΩ at 25°C, then sensor is normal.

4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. Change the sensor.

5. Plug the sensor on Indoor unit PCB and Power ON.

6. Estimate the voltage of each sensor.

7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal.

8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. Repair or Change the PCB.



2) Troubleshooting CH03

Check the Volt.

Indoor Unit

V

12Vdc

12V S GND

Check the Volt.

Wired R/C

V

12Vdc

12V S GNDCN-REMO

03Communication

Wired R/C• Open / Short• Wrong connection

• Connection of wire• Main PCB Volt. DC12V• Noise interference

Displaycode


Check Point1. Check the wire connection. (Open / Short) Repair the connection

2. Check the soldering state of connector. (Soldered poorly) Repair or Change the PCB.

3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) Repair or Change the main PCB.

4. Check the installation of wired remote controller. (Noise interference) Adjust the state of installation

Service Manual 51



Check the resistance

Ω

0Ω

CN Float

CN-Float

CN-D/PUMP

04 Drain pump/ Float switch

• Float switch Open.(Normal : short)

• The connection of wire(Drain pump/ Float switch)• Drain pump power input. (220V)• Drain tube installation.• Indoor unit installation. (Inclination)

Displaycode


Check Point1. Check the wire connection. (Open, Soldered poorly) Repair the connection or change the PCB.

2. Check the resistance of float switch (Abnormal : Open, Normal : short) Check the float switch.

3. Check the level of water

4. Check the volt. Of Drain pump power supply. (AC 230V) Repair or Change the main PCB.



05

05

Communication(Indoor Outdoor)

M/S Switch(Outdoor PCB)

• Communication poorly

• PCB • Refer 21

• Power input AC 220V. (Outdoor, Indoor)• The connector for transmission is disconnected.• The connecting wires are misconnected.• The GND1,2 is not connected at main GND.• The communication line is shorted at GND.• Transmission circuit of outdoor PCB is abnormal.• Transmission circuit of indoor PCB is abnormal.

Displaycode


Check Point1. Check the input power AC380~450V. (Outdoor, Indoor unit)

2. Check the communication wires are correctly connected.

Adjust the connection of wire

Confirm the wire of “Live”, “Neutral”

3. Check the resistance between communication line and GND.(Normal : Over 2MΩ)

4. Check the connector for communication is correctlyconnected.

5. Check the connection of GND1, GND2, and main GND.

6. If one indoor unit is operated normally, outdoor PCB is noproblem.

Check the another indoor unit.

* CH05 is displayed at indoor unit, CH53 is displayed at outdoorunit.


Service Manual 53



LEV Openness(Pulse)

COMP Frequency(Hz)

Toff(105) °C

T1(90) °C

T2(95) °C

OFFNormal

OFF ControlNormal

Normal

Normal

D-Pipe temp.

33D-pipe (Constant)

temp. high(105°C )

• Discharge sensor(Cons.) temp. high

• Check the discharge pipe sensor for Cons.• Check the install condition for over load.• Check the leakage of refrigerant.• Check the SVC V/V open.

Displaycode


Check Point• CH 33

1. Check the install condition for over load.

2. Check the SVC V/V open.

3. Check the leakage of refrigerant.

4. Check the constant compressor. (same with CH21)


6) Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65

Ω

44

45

46

47

Air sensor

Condenser Pipe sensor

Suction Pipe sensor

D-pipe sensor (Constant)





• Normal resistor : 10KΩ / at 25°C (Unplugged)• Normal voltage : 2.5Vdc / at 25°C (plugged)




Displaycode


Check Point1. Estimate the resistance of each sensor.(Unplugged)

2. Estimate the voltage of each sensor.(Plugged)

3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal.

If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal.


Service Manual 55

7) Troubleshooting CH51, CH60

51 Over capacity • Over capacityCombination

• Check the indoor unit capacity.• Check the combination table.

Displaycode


Check Point• CH 51

1. Check the indoor unit capacity.



Exploded View & Replacement Parts List


1. Indoor UnitSR Chassis

346810

146811

263230-1

268716

131410

359011

342800

159901

135316

268712

159830

354210

135311

135316

267110

249951

733010

152313135314

152302

35211B

135516

W0CZZ

352150

266090

268715

352116352115

263230-2

Service Manual 57


PART No.

LMNC096LRL0 LMNC126LRL0

131410 CHASSIS ASSEMBLY 3141A20006A 3141A20006A R

135311 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A10127A 3531A10127A R

135314 GRILLE ASSEMBLY,INLET SUB 3531A20100B 3531A20100A R

135316 GRILLE ASSEMBLY,FRONT(INDOOR) 3531A20187M 3531A20187Q R

135516 COVER ASSEMBLY,MOTOR 3551A20050P 3551A20050P R

146811 MOTOR ASSEMBLY,STEP 4681A20055A 4681A20055A R

152302 FILTER(MECH),A/C 5230A10005A 5230A10005A R

152313 FILTER ASSEMBLY,DEODORIZER 5231A20032C 5231A20032C R

159830 AIR CLEANER ASSEMBLY 5983A10009V 5983A10009V R

159901 VANE,HORIZONTAL 5990A10005A 5990A10005A R

249951 CONTROL BOX ASSEMBLY,INDOOR 4995A20361A 4995A20361G R

263230-1 THERMISTOR ASSEMBLY 6323AQ3226T 6323AQ3226T R

263230-2 THERMISTOR ASSEMBLY 6323A20004A 6323A20004A R

266090 H.V ASSEMBLY 6609A10003J 6609A10003J R

267110 REMOTE CONTROLLER ASSEMBLY 6711A20067J 6711A20067H R

268712 PWB(PCB) ASSEMBLY,DISPLAY 6871A20194A 6871A20194A R

268715 PWB(PCB) ASSEMBLY,MAIN(AC) 6871A20267B 6871A20267B R

268716 PWB(PCB) ASSEMBLY,MAIN(DC) 6871A20440A 6871A20440G R

342800 BEARING 4280A20004A 4280A20004A R

346810 MOTOR ASSEMBLY,INDOOR 4681A20062A 4681A20062A R

35211B TUBE ASSEMBLY,TUBING 5211AR7066P 5211AR7066P R

352115 TUBE ASSEMBLY,EVAPORATOR IN 5211A20470J 5211A20470J R

352116 TUBE ASSEMBLY,EVAPORATOR OUT 5211A20471D 5211A20471D R

352150 HOSE ASSEMBLY,DRAIN 5251AR2575F 5251AR2575F R

354210 EVAPORATOR ASSEMBLY,FIRST 5421A10024A 5421A10024A R

359011 FAN ASSEMBLY,CROSS FLOW 5901A20007B 5901A20007B R

733010 PLATE ASSEMBLY,INSTALL 3301A10003A 3301A10003A R

W0CZZ CAPACITOR,DRAWING 3H01487A 3H01487A R

DESCRIPTION REMARKSLOCATION

No.

Parts List(SR chassis)



34681035211B

135516

W0CZZ

352150

267110

146811

266090

263230-1

268715

268716

131410

359011

342800

159901-1

159901-2

268712

135316

159830

135311 352111

135316

249951

733010

152313135314

152302

352115

352116

263230-2

ST Chassis

Service Manual 59


PART No.

LMNC186LTL0 AMNC186LTL0 AMNH246LTL0 AMNH246LTA0 AMNC246LTL0

131410 CHASSIS ASSEMBLY 3141A10002A 3141A10002A 3141A10002A 3141A10002A 3141A10002A R

135311 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A10116A 3531A10116A 3531A10116A 3531A10116A 3531A10116A R

135314 GRILLE ASSEMBLY,INLET SUB 3531A20107W 3531A20107V 3531A20107W - 3531A20107V R

135316 GRILLE ASSEMBLY,FRONT(INDOOR) 3531A20207E 3531A20207F 3531A20207E 3531A24010F 3531A20207F R

135516 COVER ASSEMBLY,MOTOR 3551A20099C 3551A20099C 3551A20099C 3551A20099C 3551A20099C R

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

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

159830 AIR CLEANER ASSEMBLY 5983A10006T 5983A10006T 5983A10006T - 5983A10006T R

159901-1 VANE,HORIZONTAL 5990A20008A 5990A20008A 5990A20008A 4995A11004D 5990A20008A R

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

249951 CONTROL BOX ASSEMBLY,INDOOR 4995A20361E 4995A20361K 4995A20361F 4995A20361F 4995A20361L R

263230-1 THERMISTOR ASSEMBLY 6323AQ3226T 6323AQ3226T 6323AQ3226T 6323AQ3226T 6323AQ3226T R

263230-2 THERMISTOR ASSEMBLY 6323A20004A 6323A20004A 6323A20004A 6323A20004A 6323A20004A R

266090 H.V ASSEMBLY 6609A10003L 6609A10003L 6609A10003L - 6609A10003L R

267110 REMOTE CONTROLLER ASSEMBLY 6711A20067J 6711A20067H 6711A20067J 6711A20083F 6711A20067H R

268712 PWB(PCB) ASSEMBLY,DISPLAY 6871A20194B 6871A20194B 6871A20194B 6871A20194B 6871A20194B R

268715 PWB(PCB) ASSEMBLY,MAIN(AC) 6871A20267B 6871A20267B 6871A20267B 6871A20267B 6871A20267B R

268716 PWB(PCB) ASSEMBLY,MAIN(DC) 6871A20440E 6871A20440L 6871A20440F 6871A20440F 6871A20440M R

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

346810 MOTOR ASSEMBLY,INDOOR 4681A20003D 4681A20003D 4681A20067A 4681A20067A 4681A20067A R

352111 TUBE ASSEMBLY,CONNECTOR 5211A20514B 5211A20514B 5211A20514B 5211A20514B 5211A20514B R

352115 TUBE ASSEMBLY,EVAPORATOR IN 5211A30058H 5211A30058H 5211A30097J 5211A30097J 5211A30097J R

352116 TUBE ASSEMBLY,EVAPORATOR OUT 5211A30057D 5211A30057D 5211A30098G 5211A30098G 5211A30098G R

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

359011 FAN ASSEMBLY,CROSS FLOW 5901A20008A 5901A20008B 5901A20008A 5901A20008A 5901A20008B R

733010 PLATE ASSEMBLY,INSTALL 3301A10002A 3301A10002A 3301A10002A 3301A10002A 3301A10002A R

35211B TUBE ASSEMBLY,TUBING 5211A30439E 5211A30439E 5211A30439J 5211A30439J 5211A30439J R

W0CZZ CAPACITOR,DRAWING 3H01487G 3H01487G 3H01487G 3H01487G 3H01487G R

DESCRIPTIONSVC

CODELOCATION

No.

Parts List(ST chassis)



352150

159901

249951

W0CZZ

266090

249941268714

733010

346810

131410

146811

135311

135080-1

135080-2

263020

668713-2

135511135313

342800

267110

266090

359011

146811-1668713-1

135316146811

145200

152302

159830

263230-1263230-2

35211B

352111

352114

352118

SU, SZ, S3 chassis(Art Cool Deluxe Type)

Service Manual 61


Parts List(Art cool Deluxe Type)

PART No.

LMNC096DU*0 LMNC126DU*0 LMNC186D3*0

131410 CHASSIS ASSEMBLY 3141A20007B 3141A20007B 3141A20012A R135080-1 DECORATION (TOP) 3508A20034E 3508A20034E - R135080-2 DECORATION (BOTTOM) 3508A20034F 3508A20034F - R135311 GRILLE ASSEMBLY, DISCHARGE 3531A20137B 3531A20137B 3531A20231C R135313 GRILLE ASSEMBLY, INLET W: White - - - R

M: Metal - - - RR: Mirror 3531A21010E 3531A21010E 3531A20232B RB: Blue - - - R

D: Wood - - - RC: Cherry - - - R

135316 GRILLE ASSEMBLY, FRONT W: White - - - RM: Metal - - - RR: Mirror 3531A21027L 3531A21027L 3531A10341A RB: Blue - - - R


146811 MOTOR ASSEMBLY, STEP (Vane) 4681A20055A 4681A20055A 4681A20055A R146811-1 MOTOR ASSEMBLY, STEP (Door) 4681A20055B 4681A20055B 4681A20055D R159830 AIR CLEANER ASSEMBLY 5983A10006T 5983A10006T 5983A10006T R152302 FILTER (MECH), A/C 5230A20022A 5230A20022A 5230A20047A R159901 VANE, HORIZONTAL 5990A20015B 5990A20015B 5990A20042B R249951 CONTROL BOX ASSEMBLY 6994A20375U 6994A20375V 6994A20375W R249941 CONTROL BOX, INDOOR 4994A20067A 4994A20067A 4994A20067A R263020 PWB(PCB) ASSEMBLY W: White - - - R

M: Metal - - - RR: Mirror 6871A20463P 6871A20463P 6871A20656A RB: Blue - - - R


263230-1 THERMISTOR ASSEMBLY (Out) 6323AQ2226T 6323AQ2226T 6323AQ3226T R263230-2 THERMISTOR ASSEMBLY (Room, in) 6323A20004A 6323A20004A 6323A20004A R266090 H.V ASSEMBLY 6609A10005A 6609A10005A 6609A10005D R267110 REMOE CONTROLLER ASSEMBLY 6711A20077U 6711A20077U 6711A20077U R268714 PWB(PCB) ASSEMBLY, MAIN 6871A20684E 6871A20684N 6871A20684P R342800 BEARING 4280A20004A 4280A20004A 4280A20004A R346810 MOTOR ASSEMBLY, INDOOR 4681A20048A 4681A20048A 4681A20067C R352114 TUBE ASSEMBLY, DISTRIBUTOR 5211A202569D 5211A202569D 5211A14007A R352118 TUBE ASSEMBLY MANIFOLD 5211A20605B 5211A20605B 5211A10474D R35211B TUBE ASSEMBLY, TUBING 5211AR7066L 5211AR7066L 5211A30038Z R352150 HOSE ASEMBLY, DRAIN 5251AR1222R 5251AR1222R 5251AR1222R R354212 EVAPORATOR ASSEBLY, FINAL 5421A20105H 5421A20105H 5421A21004T R359011 FAN ASSEMBLY, CROSS FLOW 5901A20016J 5901A20016J 5901A20017C R668713 PWB ASSEMBLY, SUB 6871A20258B 6871A20258B 6871A20258B R668713 PWB ASSEMBLY, SUB 6871A20259A 6871A20259A 6871A20259A R733010 PLATE 1H00843A 1H00843A 3301A10002A RW0CZZ CAPACITOR, DRAWING 3H01487A 3H01487A 3H01487G R

DESCRIPTIONSVC

CODELOCATION

No.



PR3 chassis (Floor Standing Type)

267110

237201

135515-1

135515-2

235811-2

235811-1

137211

132111

235512

249941

268715

W0CZZ

668713

Service Manual 63


130911

35211C

354210W4811-1

354212

336610

W4810-1

730400

346810

359012

W1NHA

140570

W1WS

349480

W50400

159830337000

266000

352150

336600

269310

W4810-2

W4811-2

435512

W52103

35211A



Parts List(Floor Standing Type)

PART No.

LMNC246PRC2 LMNC286PRC2 LMNC366PRC2

132111 FRAME ASSEMBLY 3210A20046A 3210A20046A 3210A20046A

135515-1 GRILLE ASSEMBLY, INLET 3531A10203R 3531A10203R 3531A10203R

153315-2 GRILLE ASSEMBLY, INLET 3531A10203S 3531A10203S 3531A10203S

435512 COVER ASSEMBLY, TOP(INDOOR) 3551A10022A 3551A10022A 3551A10022A

137211 PANEL ASSEMBLY, FRONT(INDOOR) 3721A10190A 3721A10190B 3721A10190L

140570 LOCKER ASSEMBLY 4A01405C 4A01405C 4A01405C

159830 AIR CLEANER ASSEMBLY 5983A10004S 5983A10004S 5983A10004S

235512 COVER ASSEMBLY, DISPLAY 3551A20135P 3551A20135P 3551A20135P

235811-1 DOOR ASSEMBLY, CLEAN 3581A20005V 3581A20005V 3581A20005V

235811-2 DOOR ASSEMBLY, CLEAN 3581A20006M 3581A20006M 3581A20006M

237201 PANEL, BASE 3720A10105H 3720A10105H 3720A10105H

249941 CONTROL BOX, INDOOR 4994A10042A 4994A10042A 4994A10042A

266000 SWITCH, PUSH 6600AP2059A 6600AP2059A 6600AP2059A

267110 REMOTE CONTROLLER 6711A20060A 6711A20060A 6711A20060A

268715 PWB(PCB) ASSEMBLY, MAIN(AC) 6871A10136X 6871A10136Y 6871A10136Z

269310 THERMISTOR ASSEMBLY 6323A20016A 6323A20016A 6323A20016A

336600 HOUSING (MECH), WRAPPER 3660A20023J 3660A20023J 3660A20023J

336610 HOUSING ASSEMBLY (MECH) 3661A20017S 3661A20017S 3661A20017S

337000 NET, STEEL 3700A30001A 3700A30001A 3700A30001A

346810 MOTOR ASSEMBLY, INDOOR 4681A20183A 4681A20134A 4681A20134A

349480 ORIFICE 4948A20008B 4948A20008B 4948A20008B

352150 HOSE ASSY, DRAIN 5251AR1222X 5251AR1222X 5251AR1222X

35211C TUBE ASSY, DISCHARGE (INDOOR) 5211A20854C 5211A20854C 5211A20854C

354210 EVAPORATOR ASSEMBLY, FIRST 5421A20039Q 5421A20039Q 5421A20039Q

359012 FAN ASSEMBLY, TURBO 5901A20021A 5901A20021A 5901A20021A

668713 PWB(PCB) ASSEMBLY, SUB 6871AQ3212D 6871AQ3212D 6871AQ3212D

730400 BASE, INSTALL 3040A20067B 3040A20067B 3040A20067B

753010 HEATER ASSEMBLY, ELECTRIC - - -

W0CZZ CAPACITOR, DRAWING 3H00660N 3H00660N 3H00660N

W1NHA NUT, HEXAGON 1NHA0801206 1NHA0801206 1NHA0801206

W1WS WASHER, SPRING LOCK 1WSD0800030 1WSD0800030 1WSD0800030

W4810-1 BRACKET 4810A20142A 4810A20142A 4810A20142A

W4810-2 BRACKET 4810A10008A 4810A10008A 4810A10008A

W4811-1 BRACKET ASSEMBLY 4811A30011B 4811A30011B 4811A30011B

W4811-2 BRACKET ASSEMBLY 4811A30021A 4811A30021A 4811A30021A

W50400 RUBBER 5040A30031A 5040A30031A 5040A30031A

W52103 TUBE, DISTRIBUTOR 2H00351T 2H00351T 2H00351T

35211A TUBE ASSEMBLY, SUCTION INDOOR 5211A20851C 5211A20851C 5211A20851C


No.

Service Manual 65


L4UC488FA0

2. Outdoor Unit

437212

435512658740

W0CCZ-1

W0C

CZ-2

669200

447910430410

546810

435301

548490

552113

352112

552114

263230-2

263230-1

546810

554031

559010

668711649950

437210

435511237204

554160-2

554160-1

552115-2552115-1

552203-1

552203-2

561411-1

561411-2

561411-3

561411-4



Parts List(L4UC488FA0)

PART No.

L4UC488FA0

430410 BASE ASSEMBLY,WELD[OUTDOOR] 3041A20047F R

554031 CONDENSER ASSEMBLY,BENT 5403A20230B R

554160-1 COMPRESSOR 2520UHLT2BA R

554160-2 COMPRESSOR - R

552112 TUBE ASSEMBLY,CONDENSER IN 5211A15004A R

552113 TUBE ASSEMBLY,CONDENSER OUT 5211A15005A R

552203-1 VALVE,SERVICE 2H02479B R

552203-2 VALVE,SERVICE 2H01890W R

552203-3 VALVE,SERVICE - R

561411 COIL ASSEMBLY,EXPANSION 6140A90001P R

263230-1 THERMISTOR ASSEMBLY 6323A20020A R

263230-2 THERMISTOR ASSEMBLY 6323A20039A R

548490 ACCUMULATOR ASSEMBLY(MECH) 4949A10048B R

552114 TUBE ASSEMBLY,DISCHARGE (OUTDOOR) 5211A16005A R

447910 BARRIER ASSEMBLY,OUTDOOR 4760AP1216L R

561411-1 COIL ASSEMBLY,EXPANSION 6141A20037A R

561411-2 COIL ASSEMBLY,EXPANSION 6141A20037B R

561411-3 COIL ASSEMBLY,EXPANSION 6141A20037C R

561411-4 COIL ASSEMBLY,EXPANSION 6141A20037D R

561411-5 COIL ASSEMBLY,EXPANSION - R

649950 CONTROL BOX ASSEMBLY,OUTDOOR 4995A20166M R

668711 PWB(PCB) ASSEMBLY,MAIN(OUTDOOR) 6871A20583U R

W0CZZ-1 CAPACITOR,DRAWING 2A00986D R

W0CZZ-2 CAPACITOR,DRAWING - R

546810 MOTOR ASSEMBLY,OUTDOOR 4681A20028J R

559010 FAN ASSEMBLY,PROPELLER 5901A10032A R

435511 COVER ASSEMBLY,CONTROL(OUTDOOR) 3A01293X R

435512 COVER ASSEMBLY,TOP(OUTDOOR) 3550AP1213B R

437212 PANEL ASSEMBLY, REAR(OUTDOOR) 3720AP1202L R

137213-1 PANEL ASSEMBLY,SIDE - R

137213-2 PANEL ASSEMBLY,SIDE 3720AP1215E R

437214 PANEL ASSEMBLY,FRONT(OUTDOOR) - R

437210 PANEL ASSEMBLY,FRONT(OUTDOOR) 3720A1212B R

435301 GRILLE,DISCHARGE 3530AP1225D R

W49810 SUPPORTER ASSEMBLY 4981A11008A R

552115-1 TUBE ASSEMBLY,MENIFOLD(OUTDOOR) - R

552115-2 TUBE ASSEMBLY,MENIFOLD(OUTDOOR) - R


No.

P/No.: 3828A22020B

July, 2005

Printed in Korea

lg aircon - service manual

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