LG LM360HE Schematic

LG

Multi Type Air Conditioner

SERVICE MANUAL

LG

CAUTION

website http://www.lgservice.com
e-mail http://www.lgeservice.com/techsup.html

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

• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

MODEL: L3-C363LA0

L3-C363MA0
L3-C363NA0
L3-H363LA0
L3-H363MA0
L3-H363NA0

2 MPS Multi Air Conditioner

Multi Air Conditioner Service Manual

TABLE OF CONTENTS

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

About MPS...............................................................................................................................

....................7

Product Specifications

...............................................................................................................................

.......8

Dimensions

...............................................................................................................................

.........................10

Refrigeration Cycle Diagram.............................................................................................................................12

Wiring Diagram...................................................................................................................................................13

Electronic Control Device..................................................................................................................................14

Schematic Diagram ...........................................................................................................................................17

Functions ............................................................................................................................................................20

Operation Details................................................................................................................................................23

2-way, 3-way Valve..............................................................................................................................................30

Cycle Troubleshooting Guide............................................................................................................................34

Electronic Parts Troubleshooting Guide..........................................................................................................42

Operation ............................................................................................................................................................56

Disassembly of the parts (Indoor unit).............................................................................................................58

Exploded View and Replacement Parts List....................................................................................................60

Service Manual 3

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 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 or
underrated circuit breaker.
Use this appliance on a dedi­cated circuit.

• There is risk of fire or electric shock.

Do not let the air conditioner
runforalongtimewhenthe
humidity is very high and a
door or a window is left open.

• Moisture may condense and wet or
damage furniture.

Always ground the product.

• There is risk of fire or electric shock.

Install the panel and the cover
of control box securely.

•Thereisriskoffireorelectricshock.

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.

4 MPS Multi Air Conditioner

Safety Precautions

■ Operational

Do not modify or extend the
power cable.

• 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.

• Sharp edges could cause injury. Be
especially careful of the case edges
and the fins on the condenser and
evaporator.

For installation, always con­tact the dealer or an
Authorized Service Center.

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

Do not install the product on a
defective installation stand.

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

Be sure the installation area
does not deteriorate with age.

• If the base collapses, the air condition­er could fall with it, causing property
damage, product failure, and personal
injury.

Do not touch(operate) the
product with wet hands.

• There is risk of fire or electrical shock.

Donotplaceaheaterorother
appliances near the power
cable.

• There is risk of fire and electric shock.

Do not allow water to run into
electric parts.

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

Service Manual 5

Safety Precautions

Do not open the inlet grille of the product dur­ing operation. (Do not touch the electrostatic
filter, if the unit is so equipped.)

• There is risk of physical injury, electric shock, or product fail­ure.

Be cautious that water could not enter the
product.

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

Do not store or use flammable gas or com­bustibles near the product.

• There is risk of fire or failure of product.

If strange sounds, or smell or smoke comes
from product. Turn the breaker off or discon­nect the power supply cable.

• There is risk of electric shock or fire.

Gasolin

6 MPS Multi Air Conditioner

■ Operational

Safety Precautions

Use two or more people to lift
and transport the product.

• Avoid personal injury.

Useasoftclothtoclean.Do
not use harsh detergents, sol­vents, etc.

• There is risk of fire, electric shock, or
damage to the plastic parts of the prod­uct.

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

• There is risk of personal injury.

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

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

Do not insert hands or other objects through
the air inlet or outlet while the product is oper­ated.

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

CAUTION

■ Installation

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.

90˚

Thinner

Wax

About MPS

About MPS

Conventional (On/Off Operation)

• During a Conventional Air Conditioning
Cycle, the Compressor must turn on and
off to reach desired Temperature setting.

• A large portion of power is used during
Restart.
This causes unnecessary power
consumption.

27
25
23
21
19

0

0:05 0:10 0:15 0:20

Operation time (min)

Indoor Temp (°C)

ON OFF ON OFF

MPS

• MPS(Multi Power System) is a power
saving system With Two rotary
compressors of different capacity (60%
& 40%) Operating an A/C at high power
until it reaches desired temperature.

• And when it reaches the temperature,
only the 40% Capacity rotary
compressor operates.

27
25
23
21
19

0

0:05

100% operation 40% operation

0:10 0:15 0:20

Operation time (min)

Indoor Temp (°C)

Service Manual 7

MPS (Multi Power System)

8 MPS Multi Air Conditioner

Product Specifications

Product Specifications

1. L3-C363LA0, L3-C363MA0, L3-C363NA0

34,200/36,000 22,800/24,000 11,400/12,000 208/230V

----

3.6 2.4 1.2 at 230V
1Ø, 208/230V, 60Hz

Indoor ––8

Outdoor 63

Indoor ––40/38/36

at 230V

Outdoor 54

4,020/4,020 2,530/2,530 1,340/1,340

–––

17.9/17.9 11.6/11.6 5.9/5.9
208/230V

–––

8.5/8.9 9.0/9.5 8.5/8.9

–––

Indoor 888x287x170

Outdoor 870 x 1060 x 320

Indoor 9

Outdoor 78

Liquid 6.35(1/4)

Gas 12.7(1/2)

2,500 ––at 7.5m

O

L.C.D Wireless

O
O

Operation

2-Unit On 1-Unit On

3-Unit On

Remarks

Unit

Item

Cooling Capacity
Heating Capacity
Moisture Removal /h
Power Source ø,V,Hz

Air Circulation /min

Noise Level dB(A)

Input W

A

E.E.R. Btu/h.w
C.O.P. -

Dimensions(WxHxD)

mm

Net. Weight kg

Service Valve mm(Inch)

Refrigerant(R-22) g
Airflow Direction Control(Up & Down)
Remote Controller Type
Sleeping Operation
Drain Hose

Cooling
Heating
Cooling
Heating

Cooling

Heating

Runnig

Current

Btu/h(kcal/h)

( Hi / Med / Low )

2. L3-H363LA0, L3-H363MA0, L3-H363NA0

Product Specifications

Operation

Item

Cooling Capacity

Heating Capacity

Moisture Removal ℓ/h

Power Source ø, V, Hz

Air Circulation m

Noise Level dB(A)
( Hi / Med / Low )

Input W

Runnig

Current

E.E.R. Btu/h.w

C.O.P. -

Cooling

Heating

Cooling

Heating

Cooling

Heating

Unit

Btu/h(kcal/h)

3

/min

A

3-Unit On

34,600/36,000 23,040/24,000 11,500/12,000 208/230V

–––

3.6 2.4 1.2 at 230V

1Ø, 208/230V, 60Hz

Indoor – – 8

Outdoor 63

Indoor – – 40/38/36

Outdoor 54

3,920/3,920 2,660/2,660 1,500/1,500

–––

17.5/17.5 12.2/12.2 6.7/6.7

–––

8.8/9.2 8.7/9.0 7.7/8

–––

2-Unit On 1-Unit On

Remarks

at 230V

208/230V

Dimensions(W x H x D)

Net. Weight kg

Service Valve mm(Inch)

Refrigerant(R-22) g

Airflow Direction Control(Up & Down)

Remote Controller Type

Sleeping Operation

Drain Hose

mm

Indoor 888 x 287 x 170

Outdoor 870 x 1060 x 320

Indoor 9

Outdoor 78

Liquid 6.35(1/4)

Gas 12.7(1/2)

2,500 780 780 at 7.5m

O

L.C.D Wireless

O

O

Service Manual 9

10 MPS Multi Air Conditioner

Dimensions

1. Indoor Unit

Dimensions

Installation plate

A

A

ø70mm

Center

Center

ø70mm

Left rear piping Right rear piping

A

A

D

H

W

Tubing hole cover

W mm 888

H mm 287
D mm 170

L3-C363LA0, L3-C363MA0, L3-C363NA0
L3-H363LA0, L3-H363MA0, L3-H363NA0

MODEL

DIM

Service Manual 11

Dimensions

2. Outdoor Unit

L6L7 L8

L9

L4

H

L5

W

D

L1

L3

L2

L10 L11L11 L11L11L11

Gas side
3-way valve

Liquid side
2-way valve

L3-C363LA0, L3-C363MA0, L3-C363NA0
L3-H363LA0, L3-H363MA0, L3-H363NA0

MODEL

DIM

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

Indoor Side Outdoor Side

B

A

4- WAY Valve

COMP B

COMP A

Accum.

C

Indoor Side Outdoor Side

B

A

COMP B

COMP A

Accum.

C

ex)

Solenoid Valve
L.E.V
3-Way Valve

2-Way Valve

Capillary

12 MPS Multi Air Conditioner

Refrigeration Cycle Diagram

Refrigeration Cycle Diagram

1. L3UH363LA0, L3UH363MA0, L3UH363NA0

2.

L3UC363LA0, L3UC363MA0, L3UC363NA0

Wiring Diagram

MOTOR

PILLAR
TERMINAL

STEP

MOTOR

MAIN PCB ASSY

FORCED
OPERATION
AUTO
RESTART

REMOTE
CONTROL

THERMISTOR
(OUT PIPE)

THERMISTOR
(IN PIPE/AIR)

3854A24002C

CN-MOTOR

CN-DISP1

DISPLAY PCB ASSY

INDOOR WIRING DIAGRAM

TO OUTDOOR UNIT

C

RD BK BR BL

GV S

CN-POWER

CN-U/D

CN-TH1

CN-TH2

SW01F

Indoor Unit

L3-C363LA0, L3-C363MA0, L3-C363NA0
L3-H363LA0, L3-H363MA0, L3-H363NA0

Wiring Diagram

Outdoor Unit

L3-C363LA0, L3-C363MA0, L3-C363NA0

L3-H363LA0, L3-H363MA0, L3-H363NA0

Service Manual 13

14 MPS Multi Air Conditioner

Electronic Control Device

Electronic Control Device

Indoor Unit

• MAIN P.C.B DC ASM

Service Manual 15

Electronic Control Device

Outdoor Unit

ASM P/N : 6871A20479A

PCB P/N : 6870A90186A

CN_OOO

C51M

R22M

D05M

ZD03M

TRANS6

2003.11.10

CN_POWER2

-

~

R36M

+

~

R11M

BD01M

NTC

SMPS

C12M

C10D

1

3

6

5

R34M

C28M

C30M

C19M

C07M

Q06M

C22M

R35M

Q09M

R24M

ZD02M

D06M

R37M

C32M

C33M

R25M

ZD01M

R23M

R12M

R10M

Q03M

D04M

C23M

C10M

R13M

D02M

TRANS5

L10M

TRANS3

TRANS4

L011M

L12M

13

12

L09M

C29M

978

C17M

TRANS2

TRANS1

L02M

L08M

L07M

L06M

L05M

C18M

D03M

R09M

L01M

C06M

D01M

IC01A

C08D

R02D

C04D

C01D

L01D

Q08M

D01D

C31M

C25M

L02D

R33M

IC04D

C02D

C03D

C07D

C05D

R30M

R31M

Q07M

CN_LEV(C)

C52M

L01H

C02A

RY_FAN(L)

IC01K

C26M

R32M

C27M

R28M

Q05M

IC05M

C14M

C21M

R20M

C16M

C15M

R21M

R16M

IC04M

IC03M

C02M

R29M

R27M

R26M

R19M

C24M

CN_COM3

C13M

R18M

R14M

R17M

R15M

CN_COM1

Q04M

CN_COM2

RY_4WAY

R08M

Q02M

R04M

R03M

C09M

C05M

R07M

C04M

R06M

RY_LIQ

R02M

C03M

RY_GAS

R01M

Q01M

C01M

IC03K

L4(D)

L3(C)

L2(B)

L1(A)

IC02K

Q01Z

OSC01B

CN_RY_FAN

CN_POWER1

RY_FAN(H)

R05M

3

RY_COMP(B)

C11M

L03M

L04M

NF03M

CN_RY_SV

NF05M

NF04M

NF02M

NF01M

SW01F

CN_LEV(B)

CN_LEV(A)

C50M

LED01T

CN_TH1

CN_JIG

CN_TH2

RY_COMP(A)

4

4

PCB P/N : 6870A90195A
ASM P/N : 6871A20500

C04J

R01J

NF01J

C07J

C05J

C06J

NF02J

C09J

C03J

C01J

GND1

D01J

C02J

CN_TAB1(N)

ZNR01J

CN_POWER2

C08J

GND2

FUSE(250V/T5A)

CN_TAB2(L)

CN_POWER1

• MAIN P.C.B DC ASM

16 MPS Multi Air Conditioner

Electronic Control Device

Display P.C.B ASM

Service Manual 17

Schematic Diagram

Schematic Diagram

Indoor Unit

PKM13EPP-4002

OSC01B

3.6V

CST-8.00MTW

R21H~R25H

50V

8

R11H~R14H

R02F

12.1K

C06D

103

AUTO RESTART

REMOTE CONTROL

FORCED OPERATION

SWITCH

LIMIT

CN-SW

COM

NO

NC

123

123

Option

1

423

SW01F

5V

5V

6.2K

R06F

R04F

6.2K

470uF

25V

C05D
+

DC5V

7805

1N4148

D99

IC02D

O

I

470uF

25V

C03D

104

50V

C04D

+

DC12V

7812

IC01D

O

I

CDS

Q

ST93C46CB6

R13H

R12H

20K

R11H

OJ2HOJ1H OJ3H

R14H

5

93C46B

EEPROM

Vss

7

6

DU

ORG

Vcc

OJ4H

4

3

2

1

2

10K

+

50V

C02D

104

680uF

25V

C01D

10K

R97

KA393

IC9-1

-

4

OR2HOR5H

DC 5V

R96

20K

OR3H~0R5H

OR4H OR3H

DC12V

3

1

+

8

10K

OR1H

56K

R95

10K

R21H

R24H

R25H

5V

12.1K

1%

55

Operation

RECEIVER

Vcc

GND

Vout

Sleep

CMP

Timer

11

220

10V

C02L

LED2

LED1

LED4

LED3

44

526

5

6

2

CN-DISP

7

3

3

7

RDPKOR

YL

22

11

4

3

4

3

receiver

R01G~R04G

220

STEPPING MOTOR

(UP/DOWN)

BL

CN-U/D

4

104

C02D

5V

11

10

7

6

5V

45

48

35

46
47

13

14

33
34

2

64

63

37

32

57

56

1

KID65004AF

IC01G

KID65004AF

14

12

13

3

5

4

9

15

16

8

1

2

HVB OUT

IC01M

9

7

8

4

6

5

18

55

54

50

51

52

53

17

16

19

20

21
61
62

10

7

R01B,1M

R01T~R05T

8

5V

12

3

11

9
10

6
7

40

5

43

42

29

41

31

30

44

38

220

0.01

R22H

R23H

25V

10V

R02A,20K

C01A

5V

C02A

2

1

3

KID65004AF

59

24

22

23

15
60

25

26

36

28

27

39
49
58

15

2

12

5

11

6

13

4

14

3

5V

16

1

9

8

IC02M

R02L,1K

C01L 680pF

R81 1K

R02B,10K

50V

C81

103

5V

receiver

R02E,20

R01E

5.1K

R01L

1K

BZ01E

PK

3

2

1

2

2

STEPPING MOTOR

(LEFT/RIGHT)

BL

3

3

4

4

5

5

1

1

CN-L/R

OR
YL

RD

Option

PIPE-TH

2

3

4

DC12V

CN-MOTOR

4

4

INDOOR

FAN

MOTOR

3

3

2

2

1

1

DC 5V

+

11

CN-DC/DC

104,50V

C07D

RXE250

POLY SW

~

100uF

63V

C92

4 4

5 5

2

3

2

3

1/4W

750

R99

11

11

4

2

3

HVB OUT

+

7

KSC7536

IC01A

KIA7036P

5V

C91

103

1%

6.2K

R04H

KA393

IC9-2

R90 1K

R93 10K

-

5

DC 5V

R92 10K

R91

4.7K

6

1%

CN-TH1

1%

5V

12.1K

R02H

2433

4

2

11

CN-TH2

5V

6.2k

R26H

3

22

3

PIPE-TH

ROOM-TH

12V

1

2

1

2

CN-HVB

Option

33

HVB OUT

18 MPS Multi Air Conditioner

Schematic Diagram

Outdoor Unit

•

P07

SW01F

OR2H,OR7H,OR10H:91K,OR3H-4H,OR8H-9H,OR11H-12H:15K(ETC:20K)

R03T

11

DC 5V

56K

R04T

1K

1

2

7036P

IC01A

CN-JIG

3

4

3

4

22

JIG_RX

JIG_TX

DC 5V

10K

R01T

1K

R02T

C01H-C04H : 103

P21

21

JIG_RX

26

OSC01B

CST-8.00MGW

JIG_TX

+

3

C02A

10

R03A,100

50V

25V

0.01

C01A

R02A,4.7K

R01A,1K

Xin

Vss

Xout

R01B,1M

25

24

P22

RESET

23

22

P20

19

R01F,1K

R02F,10K

R02G,10K

R01G,10K

R04G,10K

R03G,10K

P32

29

30

P33

28

27

P31

P30

L4(C)

L3(C)

L1(A)

L2(B)

PWM(A)

PWM(C)

PWM(B)

P53

P54

46

47

P52

45

51

P60

50

P62

P63

P61

52

53

31

P37

343536

P41

P40

33

32

P36

P35

RX(C)

RX(B)

TX(C)

RX(A)

TX(B)

14

13

P13

P12

P34

111012

P10

P11

TX(A)

CN-LEV(C)

CN-LEV(B)

DC 5V

+

C52M

220

50V

231

231

5

4

5

4

IC03M

44

220

50V

+

C51M

1 132

3

2

50V

55

1

+

220

C50M

1

22

11

OUT_PIPE

OUT_TH

22

33

44

CN-TH2

SUCTION

33

44

DC 5V

R05H-R20H

(ETC: 12.1K 1%)

(R05H,R06H,R07H:6.2K 1%)

DISCHARGE

CN-TH1

11

41

R01H,1K

60

P71

P66

P65

P64

555654

P70

P67

59

57

63

P73

P72

R04H,1K

62

61

P76

P74

P75

R02H,1K

R03H,1K

1

64

7 8 9

P05

P06

5

6

P02

P04

P03

P51

44 4 3

P00

P01

42

43

P47

P50

MICOM

TMP87CM41F

58

TEST

P77

20

2

VSS

AVDD

49

48

VDD

Q01Z

KRA107M

39

40

P44

P46

P45

38

37

P42

P43

DC 5V

CN-LEV(A)

IC02M

423

423

5 5

RY-COMP(A)

RY-FAN(H)

RY-COMP(B)

IC01M

R01Z-R07Z : 4.7K

RY-LIQ

RY-FAN(L)

RY-GAS

RY-4WAY

DC 15V

Service Manual 19

Schematic Diagram

23.2K

8.06K

8.06K

23.2K

23.2K

8.06K

1%

1%

51.1K

102

100V

C25M

1%

9.1k

R27M

100uf

C24M

+

2

5

4

6

100uF

25V

C26M

R28M

13K

1%

1

5

+

R29M,2K,1%

4

22

51.1K

10K

1

2.94K

6

7

4.7K

PWM(C)

35.7K

4.3K

R26M

10.2K

3

2

1

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6.04K

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3K 5.23K39.2K 13K

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20K

14

51.1K

102

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6

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1%

13K

R17M,2K,1%

4

22 10K

1

51.1K

2.94K

6

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4.7K

PWM(B)

35.7K

4.3K

10.2K

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3

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21.5K

6.04K

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DC 5V

7

3K 5.23K39.2K 13K

20

8

20

9

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20K

51.1K

102

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1

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13K

1%

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4

22 10K

1

51.1K

6

7

2.94K

PWM(A)

4.7K

35.7K

4.3K

R01M

10.2K

1%

2

3

1

21.5K

6.04K

KRA101M

Q01M

7

DC 5V

3K 5.23K39.2K 13K

R04S

8

20 20

9

14

20K

51.1K

RY-COMP(B)

RY-COMP(A)

51.1K

2SD2220

Q08M

51.1K

R31M

220

3

34K

100K

R33M

1.5K103K

100V

R34MC31M

Vm(C)

MT 15V

94

S/W TRANS6

2

3 7

Q09M

30,1W

R37M

ZD03M

12V

200

R36M

472/250V

C30M

100V

473K

C27M

2

8

10K

R32M

IC06M

63V

680uF

C28M

+

821K

C29M

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L09M

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D06M

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S/W TRANS5

L12M

L11M

11 2

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222K

C33M

3W

68K

R35M

C32M

MT 15V

94

S/W TRANS4

2

3 7

Q06M

R25M

30,1W

12V

200

R24M

ZD02M

u-POWER MODULE

NF02J

C09J~C10J

1uF

C08J

222*2

25V

ZNR01J~ZNR02J

uRM1515-2B

302

D01J

C04J

1M

C06J~C07J

C05J

9mH

472*3

R01J

1mH

NF01J

1uF

1uF

C03J

35V

C10D

102M

561*2

C04D

35V

470UF

12uH

L01D

1000UF

35V

220uF

C05D

10V

220uF

C03D

DC 5V

DC 15V

IC04D

C06D

50V

103

7805

C07D

50V

+

+

103

C02D

470uF

+

2K

R02D

1/2W

MT 15V

C08D

103

50V

L02D

12uH

D101

FB

12

OUT

R202

9

7

+

C01D

GND

PC201

D201

R201

D202

268

C102

BP

TNY

S

D

13

+

C101

R102

OUT

GND

3

NC

DC 0V

6

5

PC201

GND

NC

DC 310V

1

IN

R101

D01D

1N4937

RY-FAN(L)

RY-FAN(H)

RY-GAS

LIVE1

3 3

CN-POWER

NEUTRAL

1

FUSE

ZNR01J

250V/T5A

INR14D471K

SVC561D-14A

1

COMP B

COMP A

43

LIVE2

43

NF01M

HOT GAS

FAN LOW

FAN HI

1

1

NF02M

1

1

1

NF04M

NF03M

1

CN-FAN

COM(A)

COM(B)

COM(C)

DKS-10D-22

1/2W

560K

R11M

51.1K

472/250V

C19M

C16M

100V

473K

8

2

10K

R20M

IC05M

63V

C17M

680uF

+

C18M

821K

1KV

L06M

L05M

FMX12S

D03M

Q02M

2SD2220

51.1K

R06M

220

3

34K

R08M

100K

1.5K103K

100V

R09MC09M

Vm(A)

ERB-44-08

D04M

8 4

6

S/W TRANS3

L08M

L07M

11 2

C23M

1KV

222K

R23M3W68K

C22M

MT 15V

94

S/W TRANS2

3

2

7

Q03M

30,1W

R13M

ZD01M

12V

200

R12M

472/250V

C07M

C04M

473K

100V

8

2

R07M

10K

IC04M

C05M+63V

680uF

C06M

821K

1KV

L02M

L01M

D01M

FMX12S

ERB-44-08

D02M

8 4

6

S/W TRANS1

L03M

L04M

11 2

1KV

C11M

222K

3W

68K

R10M

C10M

+

NTC

450V

330UF

C12M

COM(B)

3

20TX(B)

1K

R14K

102

C03K

TX(C)

RX(C)

RX(B)

RY-LIQ

RY-4WAY

R15K

10K

R12K

10K

R16K

3

2

1

8

4

20

8

4

7

5

6

R10K

1K

C02K

102

2

1

4

IC03K

4

7

5

6

8

COM(C)

DC 15V

Vm(C)

Vm(B)

DC 15V

DC 0V

BD01M

D15XB60

DC 310V

RX(A)

DC 15V

TX(A)

DC 5V

R13K

1K1K

R01K

1K

R09K

10K

R07K

R05K

R11K

10K

C01K

1K

102

8

4

7

5

6

10K

R06K

IC02K

10K

R08K

8

R02K

R04K

10K

R03K

IC01K

2

3

1

8

4

20

COM(A)

Vm(A)

DC 15V

LIQUID

1

NF05M

1

1

1

4WAY

324

324

314

3

1

CN-COM3

4

412

412

CN-COM2

231

CN-COM1

231

20 MPS Multi Air Conditioner

Functions

Functions

• Room temperature sensor. (THERMISTOR)

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

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

• Restarting is inhibited for approx. 3 minutes.

• High, Med, Low, Chaos

--- Lights up in operation

--- Lights up in Sleep Mode

--- Lights up in Timer Mode

--- Lights up in Deice Mode(for Heat pump model)

--- Lights up in Compressor operation(for Cooling model)

• 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 swing
up 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)

OUT

DOOR

Health Dehumidification Operation

• Both the indoor and outdoor fan
stops during deicing.

• Hot start after deice ends.

• The indoor fan stops until the

evaporator piping temperature will be
reached at 28°C.

Sleep Mode Auto Control

Natural Air Control by CHAOS Logic

Airflow Direction Control

Deice (defrost) control (Heating)

Hot-start Control (Heating)

Service Manual 21

Functions

Remote Controller

JET COOL

Healthy Dehumidification Operation Mode.

()

Operation Mode Selection

(Cooling

model only)

(Heating

model only)

Cooling Operation Mode.( )

Heating Operation Mode.( )

Auto Operation Mode.( )

Sleep Operation

˚C To ˚F Swtiching Button

Room, Temperature Display

Setting the Time or Timer

Airflow Direction Control

Operation ON/OFF

Temperature Setting

TEMPERATURE

LOWHIGH

Timer Selection

ON OFF

˚C / ˚F

Timer Setting

SET

Timer Cancel

CANCEL

Fan Operation Mode

Reset

Fan Speed Selection

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

Down to 18°C(64˚F)
Up to 30°C(86˚F)

Cooling

: Cancel Sleep Mode, Timer ON or Timer OFF

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

: Fan Operates without cooling or heating.

: High: 39°C(102˚F) LOW : 11°C(52˚F)

Down to 16°C(60˚F)
Up to 30°C(86˚F)

Heating

: OFF, ON, OFF ON

Display Function

• Cooling, Soft Dry, Fan, Heating

• Cooling, Soft Dry, Fan

• Sleep Mode

• Sleep Mode

• Timer Mode

• Timer Mode

• Hot-start, Defrost

Operation Indicator

Timer Indicator

Sleep Timer Indicator

Defrost Indicator

Operation Indicator

Timer Indicator

Sleep Timer Indicator

Compressor on Indicator

OUT

DOOR

Display Function

1. Heating Model 2. Cooling Model

Self-diagnosis Function

■ Error Indicator

• 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.

(Operation LED)

Error
code

Inlet pipe sensor02

Communication(Indoor → Outdoor)05

Indoor ErrorOutdoor Error

06

Different mode operation07

Contents

1 digit

Open / ShortAir sensor (open/short)01

Open / Short

Communication Poorly

Open / ShortOutlet pipe sensor

Different mode operation

10 digit

(Sleep LED)

Case of error

Operation

Led

1 time

2 time

5 time

6 time

7 time

Indoor Status

Sleep

Indoor

Led

On or stop

off

On or stop

off

off

On or stop

off

off

Fan

Off

Off

Vane

Open

Open

Close

Open

Close

Comp &

On or stop

On or stop

On or stop

Outdoor Status

Fan

Off

Off

LEV

Open

or Close

Open

or Close

Close

Open

or Close

Close

22 MPS Multi Air Conditioner

Open / ShortOutdoor Air sensor44

Open / ShortCond. Pipe sensor45

Total Indoor capacity overCapacity over Error51

4 time

5 time

1 time

4 time

4 time

5 time

Off

Off

Off

Close

Close

Close

Off

Off

Off

Close

Close

Close

Service Manual 23

Operation Details

Operation Details

Main Unit Function

1) 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

2) H/P 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

Defrost Indicator

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

■ 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°C
Compressor OFF Temp ➲ Setting Temp-0.5°C

• While in compressor running, operating with the airflow speed set by the remote control. While in compressor
not 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°C
24°C ≤ Intake Intake Air Temp<26°C ➲ Intake Air Temp-1°C
18°C ≤ Intake Intake Air Temp<24°C ➲ Intake Air Temp-0.5°C
Intake Air Temp<18°C ➲ 18°C

24 MPS Multi Air Conditioner

Operation Details

• 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 dehumidifica-

tion operation and 4-min compressor off repeat.
Compressor ON Temp. ➲ Setting Temp+0.5°C
Compressor OFF Temp. ➲ Setting Temp-0.5°C

• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.

■ Heating Mode Operation(H/P model)

• When the intake air temp reaches +3°…above the setting temp, the compressor is turned off. When below
the setting temp, the compressor is turned on.
Compressor ON Temp. ➲ Setting Temp.
Compressor OFF Temp. ➲ Setting Temp.+3°C

• While in compressor on, the indoor fan is off when the indoor pipe temp. is below 20

°C, when above 28°C,it

operates with the low or setting airflow speed. When the indoor pipe temp is between 20°C and 28°C, it oper­ates with Super-Low(while in sleep mode, with the medium airflow speed).

• While in compressor off, the indoor fan is off when the indoor pipe temp is below 33°C, when above 35°C,it
operates with the low airflow speed.

• If overloaded while in heating mode operation, in order to prevent the compressor from OLP operation, the
outdoor fan is turned on/off according to the indoor pipe temp.

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

■ Defrost Control(H/P model)

• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.

• The first defrost starts only when the outdoor pipe temperature falls below -6°C after 45 minutes passed from

starting of heating operation and more than 10 minutes operation of compressor.

• Defrost ends after 9/6 minutes passed from starting of defrost operation or after the outdoor fan operates
within max. 2 minutes 30 seconds when the outdoor pipe temperature rises over 12°C even it before 12 min­utes.

• The second defrost starts only when the outdoor pipe temperature falls below -6°C after 45 minutes passed
from ending of the first defrost and more than 10 minutes operation of compressor.

■ Heating overload(H/P models)

• Outdoor fan ON/OFF by sensing outdoor pipe temperature.

• Outdoor fan is OFF if pipe temperature is over 6.5°C and outdoor fan is ON if pipe temperature is below 0°C.

• Outdoor fan is off if any one part is heating overload condition.

Service Manual 25

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°C
Compressor OFF Temp ➲ Setting Temp + 0.5°C

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

26°C ≤ Intake Air Temp ➲ 25°C
24°C ≤ Intake Air Temp < 26°C ➲ Intake Air Temp + 1°C
22°C ≤ Intake Air Temp < 24°C ➲ Intake Air Temp + 0.5°C
18°C ≤ Intake Air Temp < 22°C ➲ Intake Air Temp
Intake Air Temp<18°C ➲ 18°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the 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 selected according to the
temperature.

■ Fuzzy Operation (H/P Model)

• When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since
the operation off, the operation mode is selected.

• When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and only
the indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake air
temp at that moment as follows.

24°C ≤ Inatake Air Temp ➲ Fuzzy Operation for Cooling
21°C ≤ Inatake Air Temp<24°C ➲ Fuzzy Operation for Dehumidification
Inatake Air Temp<21°C ➲ Fuzzy Operation for Heating

• If any of the operation modes among cooling / dehumidification / heating mode operations is carried out for 10
sec or longer before Fuzzy operation, the mode before Fuzzy operation is operated.

1) Fuzzy Operation for Cooling

• According to the setting temperature selected 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°C
Compressor OFF Temp ➲ Setting Temp + 0.5°C

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

26°C≤ Intake Air Temp ➲ 25°C
24°C≤ Intake Air Temp<26°C ➲ Intake Air Temp + 1°C
22°C≤ Intake Air Temp<24°C ➲ Intake Air Temp + 0.5°C
18°C≤ Intake Air Temp<22°C ➲ Intake Air Temp
Intake Air Temp<18°C ➲ 18°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the 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 selected according to the tem­perature.

26 MPS Multi Air Conditioner

Operation Details

2) Fuzzy Operation for Dehumidification

• According to the setting temperature selected 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°C
Compressor OFF Temp ➲ Setting Temp+0.5°C

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

26°C ≤ Intake Air Temp ➲ 25°C
24°C ≤ Intake Air Temp<26°C ➲ Intake Air Temp+1°C
22°C ≤ Intake Air Temp<24°C ➲ Intake Air Temp+0.5°C
18°C ≤ Intake Air Temp<22°C ➲ Intake Air Temp
Intake Air Temp<18°C ➲ 18°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the 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 repeats the low airflow speed or pause as in
dehumidification operation.

3) Fuzzy Operation for Heating

• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3°C or more above
the setting temp, the compressor is turned off. When below the setting temp, the compressor is turned on.

Compressor ON Temp ➲ Setting Temp
Compressor OFF Temp ➲ Setting Temp + 3°C

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

20°C≤Intake Air Temp ➲ Intake Air Temp + 0.5°C
Intake Air Temp<20°C ➲ 20°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the 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 set to the high or the medium according to the
intake air temperature and the setting temperature.

■ Airflow Speed Selection

• The airflow speed of the indoor fan is set to high, medium, low, or chaos (auto) by the input of the airflow
speed selection key on the remote control.

■ On-Timer Operation

• When the set time is reached after the time is input by the remote control, the appliance starts to operate.

• The timer LED is on when the on-timer is input. It is off when the time set by the timer is reached.

• If the appliance is operating at the time set by the timer, the operation continues.

Service Manual 27

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

■ 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.

■ Jet Cool Mode Operation (H/P Model)

• 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 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.

28 MPS Multi Air Conditioner

Operation Details

■ Auto Restarting Operation

• When the power is restored 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.

• The slide switch on the main unit of the appliance should be on the Auto Restarting position in order that the
Auto Restarting operation is available.

• 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 (unit of hour)

Slide Switch

FORCED
OPERATION

AUTO
RESTART

REMOTE
CONTROL

■ Forced Operation (C/O Model)

• 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.

• When the power is supplied while the slide switch is on the forced operation position, or when the slide switch
position is switched to the Auto Restarting position (or test operation) or switched from the remote control posi­tion to the forced operation position while the power is on, the forced operation is carried out.

• When the slide switch position is switched from the forced operation position to the Auto Restarting position or
the remote control position, the forced operation is canceled and the appliance stops operating.

• The forced operation is carried out in cooling mode with the setting temperature 22°C and the high speed of
airflow.

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

■ Forced Operation (H/P Model)

• 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.

• When the power is supplied while the slide switch is on the forced operation position, or when the slide switch
position is switched to the Auto Restarting (or test operation) position or switched from the remote control posi­tion to the forced operation position while the power is on, the forced operation is carried out.

• When the slide switch position is switched from the forced operation position to the Auto Restarting position or
the remote control position, the forced operation is canceled and the appliance stops operating.

•

The forced operation is carried out in cooling mode with the setting temperature 22°C and the high speed of airflow.

• In the forced operation mode, the indoor fan is operated at low speed for around 15 sec and then the operation

condition is set according to the intake air temperature as follows.

24°C≤Intake Air Temp ➲ Cooling Mode Operation, 22°C, High Speed
21°C≤Intake Air Temp<24°C ➲ Dehumidification Operation, 23°C, High Speed
Intake Air Temp<21°C ➲ Heating Mode Operation, 24°C, High Speed

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

Service Manual 29

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

• When the indoor pipe temp is 7°C or higher after 3 min. pause of the compressor, the compressor and the
outdoor 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 the
remote control signal cannot be received.

30 MPS Multi Air Conditioner

2-way, 3-way Valve

2-way, 3-way Valve

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

Works Shaft position Shaft position Service port

Shipping Closed Closed Closed

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

Air purging Open Closed Open

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

vacuum pump)

Operation Open Open Closed

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

Pumping down Closed Open Open

(Transfering) (clockwise) (counter-clockwise) (connected

manifold gauge)

Evacuation Open Open Open
(Servicing) (with charging

cylinder)

Gas charging Open Open Open

(Servicing) (with charging

cylinder)

Pressure check Open Open Open

(Servicing) (with charging

cylinder)

Gas releasing Open Open Open

(Servicing) (with charging

cylinder)

3.

2.

1.

4.

5.

6.

Flare nut

To
piping
connection

Open position
Closed position

Flare nut

Valve cap

To
piping
connection

Open position
Closed position

Hexagonal wrench
(4mm)

To outdoor unit

Pin

Service
port

Service
port cap

To outdoor unit

Service Manual 31

2-way, 3-way Valve

• Procedure

1. 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 operate
the valve stems.

2. Operate the unit for 10 to 15 minutes.

3. Stop operation and wait for 3 minutes, then con­nect the manifold gauge to the service port of
the 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 cycle
and stop it when the gauge indicates 1kg/cm2g.

7. Immediately set the gas side valve to the closed
position.

- Do this quickly so that the gauge ends up indi­cating 1kg/ g.

8. Disconnect the charge set, and mount the liquid
side and gas side valve caps and the service
port 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-Way

valve

Open

3-Way

valve

manifold gauge

Indoor unit

Liquid side

Close

Gas side

2-Way

valve

Open

3-Way

valve

Hi- handle
(CLOSE)

Low­handle
(CLOSE)

(1) Pumping down

32 MPS Multi Air Conditioner

2-way, 3-way Valve

(2) Evacuation

(All amount of refrigerant leaked)

• Procedure

1. 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 of
the manifold gauge.

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

4. Connect power supply to outdoor unit.

5. Evacuation for approximately one hour.

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

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

7. Disconnect the charge hose from the vacuum
pump.

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

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

Indoor unit

Outdoor unit

Liquid side

Open

Gas side

2-Way

valve

Open

3-Way

valve

manifold gauge

Indoor unit

Liquid side

Open

Gas side

2-Way

valve

Open

3-Way

valve

Vacuum pump

Hi- handle
(OPEN)

Low­handle
(OPEN)

Service Manual 33

2-way, 3-way Valve

(3) Gas Charging

(After Evacuation)

• Procedure

1. Connect the gauge to the charging cylinder.

- Connect the charge hose which you disconnect­ed 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 low handle on the gauge and charge
the system with liquid refrigerant.

- If the system can not be charged with the speci­fied 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 gas side 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.(4.2kg.m/5.5kg.m.)

- Be sure to check for gas leakage.

manifold gauge

Charging

cylinder

Hi- handle
(OPEN)

Low-handle

(OPEN)

Check valve

Indoor unit

Outdoor unit

Liquid side

Open

Gas side

2-Way

valve

Open

3-Way

valve

Indoor unit

Liquid side

Open

Gas side

2-Way

valve

Open

3-Way

valve

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.

34 MPS Multi Air Conditioner

Cycle Troubleshooting Guide

Cycle Troubleshooting Guide

Trouble analysis

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

All amount of refrigerant leaked out.
Check refrigeration cycle.

Refrigerant leakage
Clog of refrigeration cycle
Defective compressor

Excessive amount of refrigerant

Normal

Notice:

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.

Notice:

1. The suction pressure is usually 4.5~6.0 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°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 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.

Defective 4-way reverse valve

Normal Excessive amount of High pressure does not quickly

refrigerant rise at the beginning of operation.
Insufficient amount of Current is low.

Lower Higher refrigerant(Leakage)

Clogging Current is low.

Higher

Service Manual 35

Electronic Parts Troubleshooting Guide

Electronic Parts Troubleshooting Guide

(* Refer to Electronic Control Device drawing and Schematic diagram.)

Turn off Main Power

Turn on Main Power

Does "beeping" sound is made from the Indoor Unit?

Primarily, the operating condition of Micom is OK.

Check the voltage of power(About AC 220V/AC240V, 60Hz)

• Main power's voltage

• Voltage applied to the unit

• Connecting method of Indoor/Outdoor connecting

cable

• Check Fuse (Outdoor PCB Ass'y)

• Check Varistor

ZNRØ1J(Outdoor PCB Ass'y)

Check the connection housing for contacting

• Connector related to CN-DC/AC

• Display PWB Ass'y Check

Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor etc.) and contacting
condition of related connector

PCB Board Operation Check

Items

• Power Transformer
(Outdoor unit)

- Input Voltage

- Output Voltage

• IC01D(7812) Output
(Indoor/Outdoor unit)

• IC02D(7805) Output
(Indoor/Outdoor unit)

• IC01A(KIA7036, Reset IC)
X01(8MHz)

• Replace Trans

• Replace IC01D

• Replace IC02D

•

Replace faulty parts

- About AC220V/240V±10% - Check the power voltage

- About AC14±3V

• DC+12V

• DC+5V

• Voltage of Micom No. 2,

(DC +4.5V over) and Soldering condition.

Content Remedy

NO

YES

(After 10 seconds)

1. The Outdoor Unit does not operate at all

36 MPS Multi Air Conditioner

Electronic Parts Troubleshooting Guide

Turn on Main Power

While the compressor has been stopped, the compressor does not

operate owing to the delaying function for 3 minutes after stopped.

Caused by other parts except the remote control

Cause by the remote control

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

Check the contact of CN-DISPI 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 the
low speed by force.)

Check DISP PWB Ass'y

- Voltage between CN DISP1 - :DC+5V

When the detect switch(double key) inside the remote
controller door is fault, it is impossible to operate
temperature regulating( / ) and wind speed selecting.

Check the connecting circuit between the remote con­troller MICOM (No. )-R17(2Ω)-IRLED-Q1-
R16(2.2KΩ).

Check point

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

• Check Receiver Ass'y

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

Service Manual 37

Electronic Parts Troubleshooting Guide

3. When cooling does not operate

Turn on Main Power

Operate "Cooling Mode( )" by setting the desired temperature of the
remote 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 be
effected by the temperature of Heat Exchanger(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(1.0K), R04H(6.2K),
R03H(1.0K) (Indoor unit).

•Check the indoor temperature sensor is disconnected or not(About 10kΩ /at25°C).

Check if connection line (Indoor/Outdoor) is complied with Wiring Diagram.

Check Outdoor Unit

(PCB Ass'y)

Correct connection line

Good connection Bad connection

38 MPS Multi Air Conditioner

Electronic Parts Troubleshooting Guide

4. When indoor Fan does not operate.(or "ON/OFF" led of display blinks 8 times)

Turn off Main power

Check it (Indoor/Outdoor)the connection line is complied with Wiring Diagram

Check the line fuse in the outdoor unit

Check the connection of CN-MOTOR

check the operation of blower by manual

Correct connection line

Check POLY S/W in indoor PCB Ass'y

If it is opened If it is shorted

Exchange Indoor PCB Ass'y

Check the outdoor PCB Ass'y

Bad connection Good connection

Service Manual 39

Electronic Parts Troubleshooting Guide

5. When Vertical Louver does not operate.

• 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 PWB) of CN-U/D Connector

If there are no problems after above checks

• Confirm the assembly conditions that are catching and interfering parts
in 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 and

GND.

40 MPS Multi Air Conditioner

Electronic Parts Troubleshooting Guide

6. When Heating does not operate

Operate “Heating Mode( )” by setting the desired temperature of the
remote control is higher than one of the indoor temperature by 2°Cat
least.

In heating Mode, the indoor fan operates in case the pipe temperature
is higher than 28°C.

Check the connector of intake and pipe sensor(thermistors)

• Check the related circuit of R02H(12.1K), R01H(1.0K), R04H(6.2K),
R03H(1.0K).

• Check the indoor room temperature is disconnected or not (about
10KΩ/at 25°C).

• Check the indoor pipe temperature is disconnected or not (about
5KΩ/at 25°C).

Turn ON Main Power

Check if connection line (Indoor/Outdoor) is complied with Wiring Diagram.

Check Outdoor Unit

(PCB Ass'y)

Correct connection line

Good connection Bad connection

Service Manual 41

Electronic Parts Troubleshooting Guide

7. Outdoor unit does not operate at all.

8. Communication error

PCB Board Operation Check in Outdoor

Items

• Power Transformer
(Outdoor unit)

- Input Voltage

- Output Voltage

• IC01D(7812) Output
(Indoor/Outdoor unit)

• IC02D(7805) Output
(Indoor/Outdoor unit)

• IC01A(KIA7036, Reset IC)
X01(8MHz)

• Replace Trans

• Replace IC01D

• Replace IC02D

•

Replace faulty parts

- About AC220V/240V±10% - Check the power voltage

- About AC14±3V

• DC+12V

• DC+5V

Content Remedy

• The control data can be transmitted or received between indoor and outdoor unit with one signal cable.

• If the data be disturbed by any noise level and misconnection, the unit will be operated incorrectly. In this

case, the indoor unit blinks the operation and operation LED on display and indoor fan, outdoor fan, COMP
are not operated.

• The unit can be reoperated by On/Off control of Remocon.

Check Outdoor Unit

Turn off Main Power

• Check the electrical wiring diagram of outdoor side.

• Check the abnormal condition for the component of

Compressor/Outdoor Fan Motor/4-way.

• Check the “open” or “short” of connecting wires between indoor and
outdoor.

42 MPS Multi Air Conditioner

Installation

Installation

(1) Installation of Indoor, Outdoor unit

Front

Right Rear right

Rear left

Down right

Left

1) Selection of the best location

1. Indoor unit

•

There should not be any heat source or steam
near the unit.

• There should not be any obstacles to prevent
the air circulation.

• A place where air circulation in the room will be
good.

• A place where drainage can be easily obtained.

• A place where noise prevention is taken into

consideration.

• Do not install the unit near the door way.

• Ensure the spaces indicated by arrows from

the wall, ceiling, fence, or other obstacles.

2. Outdoor unit

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

• There should not be any animals or plants
which could be affected by hot air discharged.

• Ensure the spaces indicated by arrows from
the wall, ceiling, fence, or other obstacles.

3. Piping length and the elevation

Pipe Size

GAS LIQUID

Max. piping

length

A(m)

Max.

Elevation

B(m)

1/2"(3/8") 1/4" 15 7.5

More than 5 cm

More than

5 cm

More than

5 cm

More than eye-level

more than 30cm

(11.8 inch)

more than 30cm

(11.8 inch)

more than 70cm

(27.6 inch)

Indoor unit

A

B

Outdoor unit

Service Manual 43

Installation

2) Indoor Unit Installation

The mounting wall should be strong and solid
enough to protect it from the vibration.

1. Mount the installation plate on the wall with
four Type "A" screws.

(If mounting the unit on the concrete wall, consid­er using anchor bolts.)

• Always mount the Installation plate horizontally

by aligning the marking-off line by means of the
thread and a level.

2. Drill the piping hole with 70mm dia. holecore
drill.

• Line according to the arrows marked on lower

the left and the rght side of the Installation Plate.
The meeting point of the extended line is the
center of the hole.

• Drill the piping hole at either the right or the left

and the hole should be slightly slant to the out­door side.

Installation Plate

marking-off line

Thread

Weight

Type "A" screw

The lower left and the right side of
Installation Plate

Left rear piping Right rear piping

A

A

ø70mm ø70mm

Indoor Outdoor

A

A

Wall

5~7mm

44 MPS Multi Air Conditioner

Installation

1) Preparation of pipings

1. Cut the pipes and the cable.

• Use the accessory piping kit or the 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 length of the
pipe.

2. Remove burrs.

• Remove burrs from cut edges of pipes.

• Turn the pipe end toward down to avoid the

metal powder entering the pipe.

Caution:

If burrs are not removed, they may cause a gas
leakage.

3. Flaring the pipes.

• Insert the flare nuts, mounted on the connection
ports of both indoor and outdoor unit, onto the
copper pipes. Some refrgerant gas may leak,
when the flare nuts are removed from the indoor
unit, as some gas is charged to prevent the
inside of the pipe from rusting.

• Fit the copper pipe end into the Bar of flare tool
about 0~0.5mm higher. (See illustration)

• Flare the pipe ends.

4. Tape the flaring portion to protect it from the
dust or damages.

90

Slanted

Pipe cutter

Rough

"A"

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Bar

Yoke

Handle

When properly flared, the internal surface flare will
evenly shine and be of even thickness.
Since the flare part comes into contact with the connec­tors, carefully check the flare finish.

"

A"; ø12.7mm(1/2")→0~0.5 mm

ø9.52mm (3/8")

→

0~0.5 mm

ø6.35mm (1/4")

→

0~0.5 mm

(2) Piping and Drainage of Indoor Unit

Point down

Pipe

Reamer

= Improper flaring =

Inclined Cracked Uneven

Surface

damaged

thickness

Service Manual 45

Installation

2)

Connection of Pipings

1. Remove the installation plate

• Pull the two '∆' marked portion of bottom of the
chassis and pull the installation plate out of chas­sis.

2. Route the drain hose and the indoor tubing.

For left rear piping

3. Route the tubing and the drain hose straight

backwards(see figure).

4. Insert the connecting cable into the indoor

unit through the piping hole.

• Do not connect the cable to the indoor unit.

• Make a small loop with the cable for easy con-

nection later.

5. Tape the tubing, drain hose and the connecting

cable. Be sure that drain hose locates at the
lowest side of the bundle.
Locating at the upper side can be a reason that
drain water overflows drain pan inside the unit.

Installation plate

Pull

Pull

• To remove the holder, press
the bottom of the chassis
near the holder upwards
and the tab is clear of its
hole.

• Turn it clockwise approx.
90° and remove it.

Tubing holder

Press

Connecting
cable

Gas side piping

Liquid side piping
Drain hose

46 MPS Multi Air Conditioner

Installation

Connecting
cable

Drain hose

Press the lower left and right side of the unit
against the Installation Plate until the hooks
engage with their slots (sound click).

6. Indoor unit installation.

• Hook the indoor unit onto the upper position 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 the hooks are properly seated on the
installation plate by moving it in left and right.

7. Connecting the pipings to the indoor unit.

• Align the center of the pipings and sufficiently
tighten the flare nut with fingers.

• Finally, tighten the flare nut with torque wrench
until the wrench clicks.
Wrench tightening the flare nut with forque
wrench, ensure the direction for tightening fol­lows the arrows on the wrench.

8. Wrap the insulation material around the con­necting portion.

CAUTION: Take care to arrange the pipings,

drain hose and cables as the right
upper picture for inserting it into the
indoor unit and refixing the tubing
holder easily.

Pipe Size Torque

Liquid Side (1/4") 1.8kg m

Gas Side (3/8") 4.2kg m
Gas Side (1/2") 5.5kg m

Wrap the insulation material around the connecting
portion.

Indoor unit tubing Flare nut Pipings

Spanner

Torque wrench

Plastic bands

Insulation material

Service Manual 47

Installation

9. Set the pipings and the connecting cable to
the back of the chassis with the tubing
holder.

• Hook the edge of tubing holder to tap on chas-

sis and push the bottom of tubing holder to be
engaged in the bottom of chassis.

10. Indoor unit installation.

• Hook the indoor unit onto the upper portion of

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

Press the lower left and right side of the unit
against the Installation Plate until the hooks
engages with their slots (sound click).

Drain hose

Taping

Piping

2

Push

Tubing holder

Hook

1

Connecting
cable

Drain hose

48 MPS Multi Air Conditioner

Installation

Gas side piping

Gas side piping

Evaporator side piping

Evaporator side piping

Torque wrench

B-UNIT

C-UNIT

A-UNIT

Outdoor unit

A

B

C

1) Connecting the pipings to the Outdoor
unit

1. Align the center of the pipings and sufficiently

tighten the flare nut with fingers.

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.

Pipe Size Torque

Liquid Side (1/4") 1.8kg.m

Gas Side (3/8") 4.2kg.m
Gas Side (1/2") 5.5kg.m

(3) Connecting Pipings and the cable to Outdoor unit

Service Manual 49

Installation

Outdoor unit

GN/YL

20mm

GN/YL

20mm

AWG 18

AWG 12

WARNING

WARNING

NOTE

NOTE

Over 5mm

Holder for

power supply

cord

Connecting

cable

Cover control

Terminal block

Power supply

cable

A-UNIT

SVGC

B-UNIT

SVGC

C-UNIT

SVGC

Terminal BLOCK

SVGC

Terminal BLOCK

SVGC

L1 L2

Power Source

208/230V AC

(High voltage)

Indoor A-UNIT Indoor B-UNIT

Terminal BLOCK

SVGC

Indoor C-UNIT

Connecting cable(Low voltage)Connecting cable(Low voltage)Connecting cable(Low voltage)

Connection of the cable

1. Remove the cover control from the unit by
loosening the screw.

2. Dismount caps on the conduit panel.

3. Temporarily mount the conduit tubes on the conduit
panel.

4. Connect the wires to the terminals on the control
board individually as the following.

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

6. Ground the unit in accordance with local codes.

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

8. Use lock nuts to secure the conduit tubes.

1. Separately wire the high and low voltage line.

2. Use heat-proof electrical wiring capable of
withstanding temperature up to 167˚F.

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

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

• Every wire must be connected firmly.

• No wire should be allowed to touch refrigerant tubing,

the compressor or any moving parts.

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

CAUTION

The connecting cable connected to the indoor and
outdoor unit should be complied with the following
specifications. (UL recognized and CSA certified)

50 MPS Multi Air Conditioner

Installation

Connection method of the connecting
cable(Example)

(1) Dismount two-caps on the conduit panel.
(2) Make a hole appropriate for the passage of connec-

tion cable through on cap by tool.

(for low voltage line)
(3) Pass the connecting cable through the hole.
(4)

Properly connect the cable on the terminal block.
(5) Fix the connection cable with clamp cord provided on

the unit not to have strain at the terminal when the

connection cable is pulled outside up to a 35 pound

weight.
(6) Wind the vinyl tape round the connecting cable for

sealing between the surface of the connection cable

and cap.
(7) Mount the taped part of cable on the cap.
(8) Finally, mount the holed cap with the wound cable on

the conduit panel.

When connecting each power wire to the corresponding
terminal, follow instructions "How to connect wiring to the
terminals" and fasten the wire tightly with the fixing screw
of the terminal plate.

How to connect wiring to the terminals

For solid core wiring (or F-cable)

(1) Cut the wire end with a wire cutter of wire-cutting pli-

ers, then strip the insulation to expose the solid wire

about 25mm(15/16")
(2) Using a screwdriver, remove the terminal screw(s) on

the terminal plate.
(3) Using pliers, bend the solid wire to from a loop suit-

able for the terminal screw.
(4) Shape the loop wire properly, place it on the terminal

plater and tighten securely with the terminal screw

using a screwdriver.

For strand wiring

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

ers, then strip the insulation to expose the strand

wiring about 10mm(3/8").
(2) Using a screwdriver, remove the terminal screw(s) on

the terminal plate.
(3) Using a round terminal fastener or pliers, securely

clamp each stripped wire end with a round terminal.
(4) Position the round terminal wire, and replace and

tighten the terminal screw using a screwdriver.

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

WARNING

G

Terminal
block

Lock nut

Power supply line

(1ø, 230/208V)

Conduit panel

Cap(Reuse)

Clamp cord

Hole
(for low voltage line)

Cap(Remove)
Taping

(for sealing)

Low voltage line
(connecting cable)

Loop

Strip 25mm(15/16")

Insulation

Solid wire

High voltage

Low voltage

Strip 10mm(3/8")

Round
terminal

Connecting cable

Loosening the
terminal block
screw

Fastening the
wire tightly

Strand wire

Service Manual 51

Installation

Connect the cable to the indoor unit

1. Connect the wires to the terminals on the control
board individually according to the outdoor unit con­nection.

• Ensure that the color of the wires of outdoor unit and the
terminal No. are the same as those of indoor unit respec­tively.
(Refer to Wiring diagram on page11.)

2. Attach the Grille onto the cabinet.

• Grasp lower the left and right side of the Grille and
engage four tabs on the top inside edge of the chassis.

• Press the Grille toward the chassis until it will be back into
place.

CAUTION

CAUTION

Air

Conditioner

Circuit Breaker

Use a circuit
breaker or time
delay fuse.

Connecting cable

Main power source

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

Model

18k 1ø,230/208V 15A
24k 1ø,230/208V 20A
36k 1ø,230/208V 30A

Power source

Fuse or breaker

Capacity

• Be sure to refer to the wiring diagram label inside the
cover control and carry out the correct field wiring.
Wrong wiring can cause the unit to misoperate to result
in a fire hazard.

• Check local electrical codes and any specified wiring
instructions or limitations.

WARNING

52 MPS Multi Air Conditioner

Installation

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

■ 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.
(9K Btu models: 2EA,

12K Btu models: 3EA)

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 equivalent.

Pull the right and
the left side.

Screw

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

Plastic
band

Taping

Drain hose

Pipings
Connecting

cable

Power supply
cord

Seal a small
opening around
the pipings with
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

(4) Checking the drainage

(5) Form the piping

Service Manual 53

Installation

(6) Air Purging of the Pipings and indoor unit

The air which contains moisture remaining in the is refrigeration cycle may cause a malfunction on the
compressor.

1. Confirm that both the liquid side valve and the gas side valve are set to the closed position.

2. After connecting the piping, check the joints for gas leakage with gas leak detector.

3. Remove the service port nut, and connect the gauge manifold and the vacuum pump to the service port
by the charge hose.

4. Vacuum the indoor unit and the connecting pipes until the pressure in them lowers to below-76cmHg.

5. Disconnect the charge hose and fit the nut to the service port.
(Tightening torque: 1.8kg.m)

6. Remove the valve stem nuts, and fully open the stems of the 2-way and 3-way valves with a hexagon
wrench.

7. Tighten the valve stem nuts of the 2-way valve and 3-way valve.

Indoor unit

Outdoor unit

Liquid side

Closed

Gas side

2-Way

valve

Closed

3-Way

valve

manifold gauge

Indoor unit

Liquid side

Closed

Gas side

2-Way

valve

Closed

3-Way

valve

Vacuum pump

Hi- handle
(OPEN)

Low­handle
(OPEN)

Installation

h2

h2

h1

h1

A

BC

Oil trap

h1

(7) Maximum Length of Pipe and Freon Extra Charge

Multi Piping Type

Capacity(Btu/h)

36k

Indoor Capacity

(Btu/h)

12K 1/2" 1/4"

Max total length

of all pipes

(A+B+C)

Max length of

each pipe

(A/B/C)

Min length of

each pipe

(A/B/C)

Max Elevation
between each

indoor unit and

outdoor unit (h1)

between indoor

45m 15m 3m 7.5m 7.5m

(150ft) (50ft) (10ft) (25ft) (25ft)

Pipe Size

Gas Liquid Standard Length

Refrigerant

7.5m 30g/m

(25ft) (0.32oz/ft)

Max elevation

units (h2)

Additional

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 (16.4~23.0ft).

54 MPS Multi Air Conditioner

Service Manual 55

Installation

(8) Test running

Battery Cover

Settlement of Outdoor Unit

• Anchor the outdoor unit with a bolt and nut
(ø10cm) 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 house, settle the unit with an anti­vibration rubber.

2) Evaluation of the performance

1. Measure the temperature of the intake and

discharge air.

2. Ensure the difference between the intake

temperature and the discharge one is more
than 8°C.

1) Connection of power supply

1. Connect the power supply cord to the inde-

pendent power supply.

2. Prepare the remote control.

• Insert two batteries provided.
Remove the battery cover from the remote con­troller.

• Slide the cover according to the arrow direction.
Insert the two batteries.

(Two "R03" or "AAA" dry-cell batteries or equiv­alent.)

• Be sure that the (+) and (-) directions are cor­rect.

• Be sure that both batteries are new.
Re-attach the cover.

• Slide it back into position.

3. Operate the unit at cooling operation mode
for fifteen minutes or more.

: Heating capacity decreases as outdoor
temperature decreases.
The unit can work below to 14F without unit out or
system shut down.

NOTICE

Bolt

Tubing connection

Discharge air

56 MPS Multi Air Conditioner

Operation

Operation

(1) Name and Function-Remote Control (Door Closed)

Signal transmitter

Transmits the signals
to the room air conditioner.

REMOTE CONTROL

START/STOP BUTTON

Operationstartswhenthisbuttonispressedandstops
when the button is pressed again.

OPERATION MODE SELECTION BUTTON

Used to select the operation mode.

ROOM TEMPERATURE SETTING BUTTONS

Used to select the room temperature.

INDOOR FAN SPEED SELECTOR

Used to select fan speed in four steps
low, medium, high, or CHAOS.

JET COOL

Used to start or stop the speed
cooling. (Speed cooling operates
super high fan speed in cooling mode.)

CHAOS SWING BUTTON

Used to stop or start louver movement and
set the desired up/down airflow direction

.

1

234

5

6

Signal transmitter

5
4

6
1

3

Flip-up door

(closed)

2

Service Manual 57

Operation

(2) Name and Function-Remote Control (Door Opened)

Signal transmitter

Transmits the signals

to the room air conditioner.

REMOTE CONTROL

ON/OFF TIMER BUTTONS

Used to set the time of starting and stopping operation.

TIME SETTING BUTTONS

Used to adjust the time.

TIMER SET/CANCEL BUTTONS

Used to set the timer when the desired time is obtained and
to cancel the Timer operation.

SLEEP MODE AUTO BUTTON

Used to set Sleep Mode Auto operation.

AIR CIRCULATION BUTTON

Used to circulate the room air without cooling or heating
(turns indoor fan on/off).

ROOM TEMPERATURE CHECKING BUTTON

Used to check the room temperature.

˚CTO˚F SWITCHING BUTTON

RESET BUTTON

Used prior to resetting time or after replacing batteries.

Signal transmitter

1

2

3

4

ON OFF

1
2
3

SET

CANCEL

˚C/˚F

4
5
6
7
8

5

6

7

8

58 MPS Multi Air Conditioner

Disassembly of the parts (Indoor unit)

Disassembly of the parts (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. To remove the sensor, housing connect, step

motor conductor with sensor holder, Motor,
Evaporator & P.C.B.

Screw

Step Motor
Conductor

Motor
Conductor

Sensor
Conductor

Service Manual 59

Disassembly of the parts (Indoor unit)

2. To remove the Control Box.

• Remove securing screws.

• Pull the control box out from the chassis care-

fully.

3. To remove the Discharge Grille.

• Pull the discharge grille out from the chassis
carefully.

4. To remove the Evaporator.

• Remove screws securing the evaporator and
the holder eva.

• 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 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.

60 MPS Multi Air Conditioner

Exploded View and Replacement Parts List

Exploded View and Replacement Parts List

135312

268712

267110

135311

354210

152313

249951

152302

135500

135314

159901

342800

131410 733010

346812

263230-1

263230-2

268714

352150

146811

35211B

359011

1. Indoor Unit

L3-C363LA0/C363MA0/C363NA0, L3-H363LA0/H363MA0/H363NA0

Service Manual 61

Exploded View and Replacement Parts List

PART No.

L3-C363LA0 L3-C363MA0 L3-C363NA0 L3-H363LA0 L3-H363MA0 L3-H363NA0

131410 CHASSIS ASSEMBLY 3141A20003D 3141A20003D 3141A20003D 3141A20003D 3141A20003D 3141A20003D R
135311 GRILLE ASSEMBLY,DISCHARGE(INDOOR)3531A10023X 3531A10023X 3531A10023X 3531A10023X 3531A10023X 3531A10023X R
135312 GRILLE ASSEMBLY, FRONT 3531A10098B 3531A10098B 3531A10098B 3531A10098A 3531A10098A 3531A10098A R
135500 COVER 3550A10107A 3550A10107A 3550A10107A 3550A10107A 3550A10107A 3550A10107A R
146811 MOTOR ASSEMBLY, STEP 4681AR2727H 4681AR2727H 4681AR2727H 4681AR2727H 4681AR2727H 4681AR2727H R
152302 FILTER(MECH), A/C 5230A20004A 5230A20004A 5230A20004A 5230A20004A 5230A20004A 5230A20004A R
152313 DEODORIZER 5231AR2412T - - 5231AR2412T - -

Only in CND/Not in RMC
159901 VANE,HORIZONTAL 5990A30007A 5990A30007A 5990A30007A 5990A30007A 5990A30007A 5990A30007A R
249951 CONTROL BOX ASSEMBLY, INDOOR 4995A00003A 4995A00003A 4995A00003A 4995A00003A 4995A00003A 4995A00003A R

263230-1 THERMISTOR ASSEMBLY 6323A20003A 6323A20003A 6323A20003A 6323A20003A 6323A20003A 6323A20003A R
263230-2 THERMISTOR ASSEMBLY 6323A20024A 6323A20024A 6323A20024A 6323A20024A 6323A20024A 6323A20024A R

267110 REMOTE CONTROLLER ASSEMBLY 6711A20025N 6711A20025N 6711A20025N 6711A20026U 6711A20026U 6711A20026U R
268712 PWB(PCB) ASSEMBLY, DISPLAY 6871A30009Q 6871A30009Q 6871A30009Q 6871A30009Q 6871A30009Q 6871A30009Q R
268714 PWB(PCB) ASSEMBLY, MAIN 6871A20502B 6871A20502B 6871A20502B 6871A20502A 6871A20502A 6871A20502A R
342800 BEARING 3H02821B 3H02821B 3H02821B 3H02821B 3H02821B 3H02821B R
346812 MOTOR ASSEMBLY, DC 4681AR2295H 4681AR2295H 4681AR2295H 4681AR2295H 4681AR2295H 4681AR2295H R
35211B TUBE ASSEMBLY, TUBING 2H02449J 2H02449J 2H02449J 2H02449J 2H02449J 2H02449J R
352150 HOSE ASSEMBLY, DRAIN 5251AR2575H 5251AR2575H 5251AR2575H 5251AR2575H 5251AR2575H 5251AR2575H R
354210 EVAPORATOR ASSEMBLY, FIRST 5421A20032D 5421A20032D 5421A20032D 5421A20032D 5421A20032D 5421A20032D R
359011 FAN ASSEMBLY, CROSS FLOW 5901AR6141C 5901AR6141C 5901AR6141C 5901AR6141C 5901AR6141C 5901AR6141C R
733010 PLATE ASSEMBLY, INSTALL 1H00843A 1H00843A 1H00843A 1H00843A 1H00843A 1H00843A R
135314 GRILLE ASSY,INLET SUB 3531A10054R 3531A10054R 3531A10054R 3531A10054Q 3531A10054Q 3531A10054Q R

DESCRIPTION

SVC

CODE

LOCATION

No.

PartsList-IndoorUnit

62 MPS Multi Air Conditioner

Exploded View and Replacement Parts List

L3UC363LA0, L3UC363MA0, L3UC363NA0

546810

559010

552203-1

552203-2

554160-2

554160-1

567502

554031

447910

430410

435512

135301

437211

137213-2137213-1

135314

548490

552112

552113

552117

561411-1

561411-2

561411-3

263230-1

263230-2

649950

668711-2

668711-1

W0CZZ-1

W0CZZ-2

435511

2. Outdoor Unit

Service Manual 63

Exploded View and Replacement Parts List

PART No.

L3-C363LA0 L3-C363MA0 L3-C363NA0

135301 GRILLE,DISCHARGE 3530A20006B 3530A20006B 3530A20006B R

135314 GRILLE,REAR 3530A10176B 3530A10176B 3530A10176B R
263230-1 THERMISTOR ASSEMBLY 6323A20028A 6323A20028A 6323A20028A R
263230-2 THERMISTOR ASSEMBLY 6323A20026A 6323A20026A 6323A20026A R

430410 BASE ASSEMBLY, OUTDOOR 3041AP7177D 3041AP7177D 3041AP7177D R

435511 COVER ASSEMBLY,CONTROL(OUTDOOR) 3551A10044B 3551A10044B 3551A10044B R

435512 COVER ASSEMBLY,TOP(OUTDOOR) 3H03266H 3H03266H 3H03266H R

437211 PANEL ASSEMBLY,FRONT(OUTDOOR) 3721A10109A 3721A10109A 3721A10109A R

447910 BARRIER ASSEMBLY,OUTDOOR 4791A10019B 4791A10019B 4791A10019B R

546810 MOTOR ASSEMBLY,OUTDOOR 4681AR1392X 4681AR1392X 4681AR1392X R

548490 ACCUMULATOR ASSEMBLY(MECH) 5211A21233B 5211A21233B 5211A21233B R

552112 TUBE ASSEMBLY,CONDENSER IN 5211A11010C 5211A11010C 5211A11010C R

552113 TUBE ASSEMBLY, CONDENSER OUT 5211A12001C 5211A12001C 5211A12001C R

552116 TUBE ASSEMBLY, REVERSING - - - R

552117 TUBE ASSEMBLY, SUCTION(OUTDOOR) 5211A10446C 5211A10446C 5211A10446C R

554031 CONDENSER ASSEMBLY, BENT 5403A20168C 5403A20168C 5403A20168C R

559010 FAN ASSEMBLY, PROPELLER 5901A10033A 5901A10033A 5901A10033A R
561410-1 COIL ASSEMBLY, REVERSING VALVE - - - R
561410-2 COIL ASSEMBLY, SOLENOID - - - R

649950 CONTROL BOX ASSEMBLY,OUTDOOR 4995A00002B 4995A00002B 4995A00002B R
668711-1 PWB(PCB) ASSEMBLY,MAIN(AC) 6871A20500B 6871A20500B 6871A20500B R
668711-2 PWB(PCB) ASSEMBLY,MAIN(OUTDOOR) 6871A20479B 6871A20479B 6871A20479B R
137213-1 PANEL ASSEMBLY, SIDE 3721A10110A 3721A10110A 3721A10110A R
137213-2 PANEL ASSEMBLY, SIDE 3721A10111C 3721A10111C 3721A10111C R
552203-1 VALVE,SERVICE 2H01890U 2H01890U 2H01890U R
552203-2 VALVE,SERVICE 2H02479R 2H02479R 2H02479R R
554160-1 COMPRESSOR 2520UHGK2EA 2520UHGK2EA 2520UHGK2EA R
554160-2 COMPRESSOR 2520UMMK2BA 2520UMMK2BA 2520UMMK2BA R
561411-1 COIL ASSEMBLY,EXPANSION 6141A20018D 6141A20018D 6141A20018D R
561411-2 COIL ASSEMBLY,EXPANSION 6141A20018E 6141A20018E 6141A20018E R
561411-3 COIL ASSEMBLY,EXPANSION 6141A20018F 6141A20018F 6141A20018F R

W0CZZ-1 CAPACITOR,DRAWING 0CZZA20007Q 0CZZA20007Q 0CZZA20007Q R
W0CZZ-2 CAPACITOR,DRAWING 2H01451S 2H01451S 2H01451S R

567502 O.L.P 2H00599W 2H00599W 2H00599W R

DESCRIPTION

SVC

CODE

LOCATION

No.

Parts List - Outdoor Unit(L3UC363LA0, L3UC363MA0, L3UC363NA0)

64 MPS Multi Air Conditioner

Exploded View and Replacement Parts List

L3UH363LA0, L3UH363MA0, L3UH363NA0

546810

559010

552203-1

552203-2

554160-2

554160-1

554031

447910

567502

430410

435512

135301

437211

137213-2137213-1

135314

263230-1

263230-2

649950

668711-2

668711-1

W0CZZ-1

W0CZZ-2

548490

552112

55211F

552113

552116

561410-1

561411-1

561411-2

561411-3

561410-2

435511

Service Manual 65

Exploded View and Replacement Parts List

PART No.

L3-H363LA0 L3-H363MA0 L3-H363NA0

135301 GRILLE,DISCHARGE 3530A20006B 3530A20006B 3530A20006B R

135314 GRILLE,REAR 3530A10176B 3530A10176B 3530A10176B R
263230-1 THERMISTOR ASSEMBLY 6323A20028A 6323A20028A 6323A20028A R
263230-2 THERMISTOR ASSEMBLY 6323A20026A 6323A20026A 6323A20026A R

430410 BASE ASSEMBLY, OUTDOOR 3041AP7177D 3041AP7177D 3041AP7177D R

435511 COVER ASSEMBLY,CONTROL(OUTDOOR) 3551A10044A 3551A10044A 3551A10044A R

435512 COVER ASSEMBLY,TOP(OUTDOOR) 3H03266H 3H03266H 3H03266H R

437211 PANEL ASSEMBLY,FRONT(OUTDOOR) 3721A10109A 3721A10109A 3721A10109A R

447910 BARRIER ASSEMBLY,OUTDOOR 4791A10019B 4791A10019B 4791A10019B R

546810 MOTOR ASSEMBLY,OUTDOOR 4681AR1392X 4681AR1392X 4681AR1392X R

548490 ACCUMULATOR ASSEMBLY(MECH) 5211A21233A 5211A21233A 5211A21233A R

552112 TUBE ASSEMBLY,CONDENSER IN 5211A11010C 5211A11010C 5211A11010C R

552113 TUBE ASSEMBLY, CONDENSER OUT 5211A12001C 5211A12001C 5211A12001C R

552116 TUBE ASSEMBLY, REVERSING 5211A10448A 5211A10448A 5211A10448A R

552117 TUBE ASSEMBLY, SUCTION(OUTDOOR) - - - R

554031 CONDENSER ASSEMBLY, BENT 5403A20168A 5403A20168A 5403A20168A R

559010 FAN ASSEMBLY, PROPELLER 5901A10033A 5901A10033A 5901A10033A R
561410-1 COIL ASSEMBLY, REVERSING VALVE 6141A20021A 6141A20021A 6141A20021A R
561410-2 COIL ASSEMBLY, SOLENOID 6141A20022A 6141A20022A 6141A20022A R

649950 CONTROL BOX ASSEMBLY,OUTDOOR 4995A00002A 4995A00002A 4995A00002A R
668711-1 PWB(PCB) ASSEMBLY,MAIN(AC) 6871A20500B 6871A20500B 6871A20500B R
668711-2 PWB(PCB) ASSEMBLY,MAIN(OUTDOOR) 6871A20479A 6871A20479A 6871A20479A R
137213-1 PANEL ASSEMBLY, SIDE 3721A10110A 3721A10110A 3721A10110A R
137213-2 PANEL ASSEMBLY, SIDE 3721A10111C 3721A10111C 3721A10111C R
552203-1 VALVE,SERVICE 2H01890U 2H01890U 2H01890U R
552203-2 VALVE,SERVICE 2H02479R 2H02479R 2H02479R R
554160-1 COMPRESSOR 2520UHGK2EA 2520UHGK2EA 2520UHGK2EA R
554160-2 COMPRESSOR 2520UMMK2BA 2520UMMK2BA 2520UMMK2BA R
561411-1 COIL ASSEMBLY,EXPANSION 6141A20018D 6141A20018D 6141A20018D R
561411-2 COIL ASSEMBLY,EXPANSION 6141A20018E 6141A20018E 6141A20018E R
561411-3 COIL ASSEMBLY,EXPANSION 6141A20018F 6141A20018F 6141A20018F R
W0CZZ-1 CAPACITOR,DRAWING 0CZZA20007Q 0CZZA20007Q 0CZZA20007Q R
W0CZZ-2 CAPACITOR,DRAWING 2H01451S 2H01451S 2H01451S R

567502 O.L.P 2H00599W 2H00599W 2H00599W R

55211F TUBE ASSEMBLY, SOLENOIDE 5211A00007A 5211A00007A 5211A00007A R

DESCRIPTION

SVC

CODE

LOCATION

No.

Parts List - Outdoor Unit(L3UH363LA0, L3UH363MA0, L3UH363NA0)

P/No.: 3828A20466A

August, 2004

Printed in Korea