Mitsubishi MS-10SN-C2, MS-12SN-C2, MS-15SN-C1, MS-15SN-C2, MS-12SN-C1 Service Manual

SPLIT-TYPE, AIR CONDITIONERS

Revision:

●MS-09SN -, MS-10SN -, MS-12SN -, MS-15SN -
and MS-18SN - has been added.

●Please void OB256 REVISED EDITION-A.

SERVICE MANUAL

Wireless type
Models

C2C2C2C2

C1

No. OB256

REVISED EDITION-B

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN ­MS-12SN ­MS-12SN ­MS-15SN ­MS-15SN ­MS-17SN ­MS-18SN ­MS-24SN -

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

C1
C2
C1
C2

(WH)
(WH)
(WH)
(WH)
(WH)
(WH)
(WH)
(WH)
(WH)
(WH)
(WH)

· MU-09SN -

· MU-09SN -

· MU-10SN -

· MU-10SN -

· MU-12SN -

· MU-12SN -

· MU-15SN -

· MU-15SN -

· MU-17SN -

· MU-18SN -

· MU-24SN -

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················4

3. SPECIFICATION·················································6

4. OUTLINES AND DIMENSIONS·························9

5. WIRING DIAGRAM ··········································12

6. REFRIGERANT SYSTEM DIAGRAM··············18

7. PERFORMANCE CURVES······························22

8. MICROPROCESSOR CONTROL ····················25

9. SERVICE FUNCTIONS ····································32

10. TROUBLESHOOTING······································34

11. DISASSEMBLY INSTRUCTIONS ·····················42

12. PARTS LIST······················································50

13. OPTIONAL PARTS ···········································58

C1C1

C2C2

C1C1

C2C2

C1C1

C2C2

C1C1

C2C2

C1C1

C1C1

C1C1

1

TECHNICAL CHANGES

MS-09NW - ➔ MS-09SN -

1. Power supply voltage has changed. (110V ➔ 220V)

2. Indoor unit model has changed.

3. Remote controller has changed.

• SLEEP MODE function has been removed.

• ECONO COOL operation has been added.

• SWING button was removed, but SWING MODE function is available by VANE CONTROLbutton.

MS-10SN -

New model

C1

MS-12NN - ➔ MS-12SN -

1. Design of receiver part on indoor unit has changed.

2. Remote controller has changed.

• SLEEP MODE function has been changed.

• ECONO COOL operation has been added.

• SWING button was removed, but SWING MODE function is available by VANE CONTROLbutton.

MS-15NN - ➔ MS-15SN ­MS-17NN - ➔ MS-17SN -

1. Design of receiver part on indoor unit has changed.

2. Remote controller has changed.

• SLEEP MODE function has been removed.

• ECONO COOL operation has been added.

• SWING button was removed, but SWING MODE function is available by VANE CONTROLbutton.

MS-24NN - ➔ MS-24SN -

1. Design of receiver part on indoor unit has changed.

2. Remote controller has changed.

• SLEEP MODE function has removed.

• ECONO COOL operation has added.

• SWING button was removed, but SWING MODE function is available by VANE CONTROLbutton.

C1C1

C1C1

C1C1

C1C1

C1C1

MS-09SN - ➔ MS-09SN ­MS-10SN - ➔ MS-10SN ­MS-12SN - ➔ MS-12SN ­MS-15SN - ➔ MS-15SN -

1. Fan guard has added.

2. Indoor electronic control P.C. board has changed.
Indoor fan speed has changed.

MS-18SN -

New model

C1

C2C1

C2C1

C2C1

C2C1

2

MU-09NW - ➔ MU-09SN -

C1C1

1. Outdoor unit model has changed.

2. Additional refrigerant amount of extended pipe length over 7m has changed. (10g/m ➔ 15g/m)

MU-10SN -

C1

New model

MU-12NN - ➔ MU-12SN -

C1C1

1. Outdoor unit model has changed.

2. Additional refrigerant amount of extended pipe length over 7m has changed. (10g/m ➔ 15g/m)

3. Diameter of expansion pipe (GAS) has changed. ([15.88 ➔ [12.7)

MU-15NN - ➔ MU-15SN ­MU-17NN - ➔ MU-17SN -

C1C1

C1C1

1. Additional refrigerant amount of extended pipe length over 7m has changed. (10g/m ➔ 15g/m)

2. Service port has removed from outdoor unit.

3. Fusible plug has removed from outdoor unit.

MU-24NN - ➔ MU-24SN -

C1C1

1. Additional refrigerant amount of extended pipe length over 7m has changed. (10g/m ➔ 15g/m)

MU-09SN - ➔ MU-09SN ­MU-10SN - ➔ MU-10SN ­MU-12SN - ➔ MU-12SN ­MU-15SN - ➔ MU-15SN -

C2C1

C2C1

C2C1

C2C1

1. Sub number has changed.

MU-18SN -

C1

New model

3

2

Emergency operation switch

Operation section

Horizontal vane

Air filter

Deodorizing filter(option)
(gray sponge type)

Vertical vane

Air inlet

Grille

Remote control
receiving section

Remote controller

Display section

(when the grille is open)

Operation indicator lamp

Receiving section

Air cleaning filter(option)
(white bellows type)

Front panel

Emergency operation switch

Operation indicator lamp

Receiving section

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

(back and side)

PART NAMES AND FUNCTIONS

INDOOR UNIT

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

C1
C2
C1
C2

MS-12SN ­MS-12SN ­MS-15SN ­MS-15SN ­MS-17SN ­MS-18SN ­MS-24SN -

C1
C2
C1
C2
C1
C1
C1

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

C1
C2
C1
C2

MS-12SN ­MS-12SN ­MS-15SN ­MS-15SN -

C1
C2
C1
C2

OUTDOOR UNIT

MU-09SN ­MU-09SN ­MU-10SN ­MU-10SN ­MU-12SN ­MU-12SN -

MS-17SN ­MS-18SN ­MS-24SN -

C1
C2
C1
C2
C1
C2

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

C1
C2
C1
C2

C1
C1
C1

MS-12SN ­MS-12SN ­MS-15SN ­MS-15SN -

C1

MS-17SN -

C2

MS-18SN -

C1

MS-24SN -

C2

C1
C1
C1

MU-15SN ­MU-15SN ­MU-17SN ­MU-18SN ­MU-24SN -

C1
C2
C1
C1
C1

4

ACCESSORIES

<Indoor unit>

Installation plate
Installation plate fixing screw 4 x 25 mm
Remote controller mounting hardware
Fixing screw for 3 3.5 x 16 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)

1
5
1
2
2
1
1

1
2
3
4
5
6
7

MS-09SN­MS-09SN-

MS-12SN­MS-12SN­MS-15SN­MS-15SN-

1
6
1
2
2
1
1

MS-17SN­MS-18SN­MS-24SN-

C2

C1

C2

C1

C2

C1

C1

C1

C1

REMOTE CONTROLLER

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN ­MS-12SN ­MS-12SN ­MS-15SN ­MS-15SN ­MS-17SN ­MS-18SN ­MS-24SN -

C1

C2

C1

C2

C1

C2

C1

C2

C1

C1

C1

Signal transmitting section

Operation display section

OPERATE /STOP

(ON /OFF)button

ON/OFF

TOO

WARM

PM

AM

TOO

COOL

TEMPERATURE buttons

FAN SPEED CONTROL button

OPERATION SELECT button

Open the front lid.

ECONO COOL button

RESET button

5

ON/OFF

WARM

FAN

I FEEL

COOL

VANE

DRY

FAN

MODE

ECONO COOL

RESET

TOO

CLOCK

CLOCK

PM

AM

TOO

COOL

STOP

START

HR.

MIN.

OFF-TIMER button

ON-TIMER button

HR. button

MIN. button

(TIME SET button)

CLOCK SET button

VANE CONTROL button

3

Indoor model

Function

Power supply

Capacity
Dehumidification
Air flow

(High/Med.w/Loww)
Power outlet
Running current
Total input
Auxiliary heater
Power factor
Starting current
Fan motor current

Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level

(High/Med.w/Loww)

Fan speed

(High/Med.w/Loww)
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)

Outdoor model
Air flow
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at20:)
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity(R22)
Refrigerating oil (Model)
Capillary tube
(Inner diameter O length)

(kcal/h)/(kW)

R/h

K /h

A
A

W

A(kW)

%

A
A

(kcal/h/W)/(W/W)

"

mm

kg

dB

rpm

k"
k"

K /h

A
A

W

"

"

mm

kg

dB

rpm

kg
cc

mm

MS-10SN -

C1

2,450/2.85

4.50

1,005

99

2.44/2.84

910/800w/680

w

MU-10SN -

C1

3.97

1.2

564/474

w

/384

w

26

10

37/33

w

/29

w

1,950

0.36

RH-145NGDT

700

C-R 2.74

C-S 3.78

RA6N33-AA

WHT-BLK 150

BLK-RED 265

49

740

0.82

[1.6 O 900

MS-10SN -

C2

2,500/2.91

4.61
992

98

2.52/2.93

940/830w/710

w

MU-10SN -

C2

4.08

Electrical

data

Fan

motor

Special

remarks

Compressor

Electrical

data

Fan

motor

Special

remarks

Capacity

Energy efficiency ratio (EER)

Capacity

Connection method

Connection method

MS-09SN -

C1

880

97

2.44/2.84

890/740w/600

w

MU-09SN -

C1

2,150/2.50

1.1

474/384

w

/300

w

4.13

21

9

35/30

w

/26

w

1,638

3.68

0.28

RH-130NGDT

650

C-R 3.19

C-S 3.55

RA6N23-AA
WHT-BLK 169
BLK-RED 226

45

630

0.80

[1.4 O 600

MS-09SN -

C2

843

93

2.55/2.97

920/770w/630

w

MU-09SN -

C2

Cooling

Single phase

220V, 60Hz

10

—

0.17

RC4N19-AA
WHT-BLK 335
BLK-RED 320

850O278O191

5

3
10
10

Flared

780o540o255

32

1

300(MS56)

Flared

SPECIFICATION

NOTE:Test conditions are based on CNS3615.

Cooling : Indoor DB 27°C / WB 19.5°C

Outdoor DB 35°C /
Indoor-Outdoor piping length 5m
w Reference value

6

C1

Indoor model

MS-12SN -

Function

Power supply

Capacity
Dehumidification

Capacity

Air flow

(High/Med.w/Loww)
Power outlet
Running current
Total input
Auxiliary heater

Electrical

data

Power factor
Starting current
Fan motor current

Energy efficiency ratio (EER)

(kcal/h)/(kW)

R/h

K /h

A
A

W

A(kW)

%

A
A

(kcal/h/W)(W/W)

3,150/3.66

1.5

5.14

1,120

99
30

2.81/3.27
Model
Winding

Fan

motor

resistance(at20:)
Dimensions WOHOD
Weight

"

mm

kg
Air direction
Sound level
Fan speed
Fan speed regulator

Special

remarks

Thermistor RT11(at25:)
Thermistor RT12(at25:)

(High/Med.w/Loww)

(High/Med.w/Loww)

dB

rpm

1,180/1,040w/900

w

k"
k"

Connection method

C1

Outdoor model

Capacity

Air flow
Compressor motor current
Fan motor current

Electrical

data

Model
Output
Winding

Compressor

resistance(at20:)
Model
Winding

Fan

motor

resistance(at20:)
Dimensions WOHOD
Weight
Sound level
Fan speed

MU-12SN -

K /h

A
A

W

"

"

mm

kg

dB

rpm

1,656

4.52

0.36

RH-167NHDT

800
C-R 2.16
C-S 3.11

RA6N33-AA
WHT-BLK 150
BLK-RED 265

780o540o255

36
49

700
Fan speed regulator
Refrigerant filling
capacity(R22)

Special

remarks

Refrigerating oil (Model)
Capillary tube
(Inner diameter O length)

kg
cc

mm

1.20

520(MS56)

[1.8O 500

Connection method

NOTE:Test conditions are based on CNS3615. (MS-12/15SN- )

C1

Cooling : Indoor DB 27°C / WB 19.5°C

Outdoor DB 35°C /

Test conditions are based on CNS 14464. (MS-12/15SN- )
Cooling : Indoor DB 27°C / WB 19°C

Outdoor DB 35°C /
Indoor-Outdoor piping length 5m
w Reference value

7

MS-12SN -

Single phase

220V, 60Hz

780/672

RA4N30-AB
WHT-BLK 118
BLK-RED 162

1,015O320O190

42/38

1,210/1,070w/930

MU-12SN -

C2

C2

MS-15SN -

Cooling

w

/570

15

—

0.26

14

5

w

w

/34

w

1,180/1,040w/900

3
10
10

Flared

C2

MU-15SN -

1

Flared

w

C1

MS-15SN -

3,650/4.24

2.2

6.50

1,400

98
36

2.61/3.03

w

1,210/1,070w/930

C1

MU-15SN -

2,340

5.74

0.50

RH-207NHDT

1,000

C-R 1.68

C-S 2.78

RA6N50-BA

WHT-BLK 116

BLK-RED 111

850o605o290

42
52

865

1.30
520(MS56)
[1.8 O 550

C2

w

C2

Indoor model

Function

Power supply

Capacity
Dehumidification
Air flow

(High/Med.w/Loww)
Power outlet
Running current
Total input
Auxiliary heater
Power factor
Starting current
Fan motor current

Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level

(High/Med.w/Loww)

Fan speed

(High/Med.w/Loww)
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)

Outdoor model
Air flow
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at20:)
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Sound level
Fan speed (High)
Fan speed regulator
Refrigerant filling
capacity(R22)
Refrigerating oil (Model)
Capillary tube
(Inner diameter O length)

(kcal/h)/(kW)

R/h

K /h

A
A

W

A(kW)

%

A
A

(kcal/h/W)/(W/W)

"

mm

kg

dB

rpm

k"
k"

K /h

A
A

W

"

"

mm

kg

dB

rpm

kg
cc

mm

Electrical

data

Fan

motor

Special

remarks

Compressor

Electrical

data

Fan

motor

Special

remarks

Capacity

Energy efficiency ratio (EER)

Capacity

Connection method

Connection method

Cooling

Single phase

220V, 60Hz

—

0.29

RA4N30-AB
WHT-BLK 118
BLK-RED 162

1,015O320O190

14

5

3
10
10

Flared

850O605O290

Flared

MS-17SN -

C1

3,950/4.59

2.3

7.30

1,580

98
39

2.50/2.91

1,260/1,140

w

/1,020

w

MU-17SN -

C1

6.51

RH-231NHDT

1,100
C-R 1.65
C-S 2.67

1.35

[2.0 O 700

2,280

0.50

RA6N50-BA

WHT-BLK 116

BLK-RED 111

44
52

865

1

520(MS56)

15

MS-18SN -

C1

4,500/5.23

2.6

840/750

w

/660

w

8.77

1,910

99
49

2.36/2.74

45/41

w

/38

w

1,290/1,170w/1,050

w

MU-18SN -

C1

7.98

RH-277NHDT

1,300

C-R 1.38

C-S 2.55

1.40

[2.0 O 500

MS-24SN -

C1

5,600/6.51

3.4

20

14.00
3,040

99
56

1.84/2.14

1,260/1,140

w

/1,020

w

MU-24SN -

C1

2,460

13.08

0.63

NH-38NBDT

1,700
C-R 0.83
C-S 1.83

RA6V60-AC

WHT-BLK 81.1, BLK-RED 102

BLK-YLW 92.2

61
54

930

2

2.15

1,200(MS32)

[2.0O 700(600+100)

NOTE:Test conditions are based on CNS3615. (MS-17/24SN- )

Cooling : Indoor DB 27°C / WB 19.5°C

Outdoor DB 35°C /

Test conditions are based on CNS14464. (MS-18SN- )
Cooling : Indoor DB 27°C / WB 19°C

Outdoor DB 35°C /
Indoor-Outdoor piping length 5m
w Reference value

C1

C1

8

4

OUTLINES AND DIMENSIONS

MS-09SN ­MS-09SN -

INDOOR UNIT

278

58

162

231.5

42

Unit: mm

271 4.5

C1

169

2.5

116.581.5

Wall hole [65

Installation plate

Liquid line [ 6.35-0.5m
Gas line [

{

Insulation [37 O.D

Drain hose [16
(Connected part O.D)

Insulation [ 28

9.52-0.43m

[ 21 I.D

41

Air in

82

326

7 or more

100

Air out

326

5

189

67

78

C2

Installation plate

Indoor unit

818

850

16562956

19

Power supply cord
Lead to right 1.0m
Lead to left 0.3m

Wireless remote controller

MS-10SN ­MS-10SN -

INDOOR UNIT

278

58

162

C1

41

Air in

82

326 326

189

or more

7

100

Air out

78

5

67

C2

Installation plate

Indoor unit

818

850

16562956

19

Power supply cord
Lead to right 1.0m
Lead to left 0.3m

169

2.5

116.581.5

Wall hole [65

Installation plate

Liquid line [6.35-0.5m
Gas line [9.52-0.43m

{

Insulation [37 O.D

[21 I.D

Drain hose [16
(Connected part O.D)
Insulation [28

231.5

42

271 4.5

Wireless remote controller

9

320

25

43-

35-

155

90

104

74

260

10

780

500

122

40

540

320

285

255

Service panel

Gas refrigerant
pipe joint
Refrigerant pipe
(flared) [9.52 (MU-09/10SN

)

[12.7 (MU-12SN

)

Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) [6.35

Airout

Air in

Air in

Service port

109

32

110

147

Drainage
3holes [33

If clearance
behind the outdoor unit
is only 400

mm

or 500

mm

side A must be fully opened.

100mm or more

100mm or more

100mm or more

350mm or more

REQUIRED SPACE

A

400mm or more

MU-09SN ­MU-09SN ­MU-10SN ­MU-10SN ­MU-12SN ­MU-12SN -

C1

C2

C1

C2

C1

C2

OUTDOOR UNIT

Unit: mm

10

MS-12SN ­MS-12SN ­MS-15SN ­MS-15SN -

INDOOR UNIT

C1

MS-17SN -

C2

MS-18SN -

C1

MS-24SN -

C2

995

C1
C1
C1

60

40

4holes 11x 20

150 648 217

Indoor unit

20

320

58

162

Wireless remote controller

MU-15SN ­MU-15SN ­MU-17SN -

C1

MU-18SN -

C2

MU-24SN -

C1

OUTDOOR UNIT

35

248

Air in

350

1015

19

450

450

352438

Installation plate

5190

Installation plate

Liquid line
Gas line

Air in

19077550

Power supply cord
Lead to right 2m
Lead to left 1m

C1
C1

20

310

345

290

Air out

REQUIRED SPACE

100mm or more

If clearance
behind the
outdoor unit is
only 400
500
must be fully

opened.

mm,

or

mm

side A

{

Insulation

Drain hose

A

500mm or more

Insulation

100mm or more

[8-0.5m

[ 12-0.43m

[ 50 O.D

[ 28 I.D

100mm or more

254

Wall hole

[

16

[

28

350mm or more

3 297

[ 75

Drainage
3holes [16.2

Air out

605

292

20

183

50

500
850

74

157

30

100

11

161

Service panel

Liquid refrigerant
pipe joint
Refrigerant pipe (flared)

o

[6.35 (MU-15/17/18SN)

30

[9.52 (MU-24SN)

o

35

Gas refrigerant
pipe joint
Refrigerant pipe (flared)
[15.88

Service port

5

SYMBOL

RT12

SR141

TB

52C

SYMBOL

MF
MV

NR11

RT11

SYMBOL

C11
F11
F12

HIC1

NAME

NAME NAME
INDOOR FAN CAPACITOR
FUSE(3.15A)
THERMAL FUSE(93:)
DC/DC CONVERTER

INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR

INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
CONTACTOR

3
2

2

3

RT12
RT11

BLK
GRY
YLW
BRN
WHT
RED

1
2
3
4
5
6

MF

F11

52C

HIC1

TRANS

NR11

C11

SR141

CN211

112

CN

CN
111

121

CN

1
3

ELECTRONIC CONTROL P.C. BOARD

TB

REMOTE
CONTROLLER

POWER MONITOR,
RECEIVER
P.C. BOARD

MV

F12

POWER
SUPPLY
CORD
1[ 220V~
60Hz

L1

L

2
1

1

2

4

3

CN201

CN
151

5

5

LD101T

GRN/YLW

BLU

WHT

BLU
BLU

BRN

BLU

BLU

BLU

C

220V~

TO OUTDOOR
UNIT
CONNECTING

BRN

GRN/YLW

FROM INDOOR
UNIT
CONNECTING
220V~

BLU

WHT

C

2

C2

TB

MF

RED

BLK

WHT

MC

C1

S

R

C

WHT

BLK

RED

SYMBOL

TB

SYMBOL

MC
MF

SYMBOL

C1
C2

NAME

NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR

COMPRESSOR(INNER PROTECTOR)
OUTDOOR FAN MOTOR(INNER PROTECTOR)

TERMINAL BLOCK

WIRING DIAGRAM

MS-09SN ­MS-10SN -

C1

C1

INDOOR UNIT

MODELS WIRING DIAGRAM

NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

2. Use copper conductors only. (For field wiring)

3. Symbols below indicate.

/: Terminal block, : Connector

C1

C1

C1

MODELS WIRING DIAGRAM

MU-09SN ­MU-10SN ­MU-12SN -

OUTDOOR UNIT

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block

12

SG79B730H02

VG79B076H01

MS-09SN -

SYMBOL

RT12

SR141

TB

52C

SYMBOL

MF
MV

NR11

RT11

SYMBOL

C11
F11
F12

HIC1

NAME

NAME NAME
INDOOR FAN CAPACITOR
FUSE(3.15A)
THERMAL FUSE(93:)
DC/DC CONVERTER

INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR

INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
CONTACTOR

3
2

2

3

RT12
RT11

BLK
GRY
YLW

BRN

WHT

RED

1
2
3
4
5
6

MF

F11

52C

HIC1

TRANS

NR11

C11

SR141

CN211

112

CN

CN

111

121

CN

1
3

ELECTRONIC CONTROL P.C. BOARD

TB

REMOTE
CONTROLLER

POWER MONITOR,
RECEIVER
P.C. BOARD

MV

F12

POWER
SUPPLY
CORD
1[ 220V~
60Hz

L1

L

2
1

1

2

4

3

CN201

CN

151

5

5

LD101T

GRN/YLW

BLU

WHT

BLU

BLU

BRN

BLU

BLU

BLU

C

220V~

TO OUTDOOR
UNIT
CONNECTING

BRN

GRN/YLW

FROM INDOOR
UNIT
CONNECTING
220V~

BLU

WHT

C

2

C2

TB

MF

RED

BLK

WHT

MC

C1

S

R

C

WHT

BLK

RED

SYMBOL

TB

SYMBOL

MC
MF

SYMBOL

C1
C2

NAME

NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR

COMPRESSOR(INNER PROTECTOR)
OUTDOOR FAN MOTOR(INNER PROTECTOR)

TERMINAL BLOCK

MS-10SN -

C2

C2

INDOOR UNIT

MODELS WIRING DIAGRAM

NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

2. Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

C2

C2

C2

MODELS WIRING DIAGRAM

MU-09SN ­MU-10SN ­MU-12SN -

OUTDOOR UNIT

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block

13

SG79J520H01

VG79B176H01

MS-12SN -

SYMBOL

RT12

TB

52C

SYMBOL

IC141

MF
MV

NR11

RT11

SYMBOL

C11

DSAR

F11
F12

HIC1

NAME

NAME NAME
INDOOR FAN CAPACITOR
SURGE ABSORBER
FUSE(3.15A)
THERMAL FUSE(93:)
DC/DC CONVERTER

HYBRID IC
INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR

INDOOR COIL THERMISTOR
TERMINAL BLOCK
CONTACTOR

220V~

BLU

BRN

2

60Hz

TRANS

HIC1

BRN

DSAR

GRN/YLW

LD1

REMOTE
CONTROLLER

3
1

DISPLAY
P.C.BOARD

101

CN

102

CN

151

CN

111

CN

ELECTRONIC CONTROL P.C. BOARD

4
2
1

C11

CN211

BLU

RECEIVER
P.C.BOARD

BLK

WHT

GRY
RED

RT11

MV

5

F11

33

BLU

MF

3

121

CN

CN
112

1[ 220V~

CORD

POWER
SUPPLY

TO OUTDOOR
UNIT
CONNECTING

BRN

L

L1

GRN/YLW

TB

NR11

IC141

52C

C

RT12

YLW

BRN

4

3

CN201

1

2

F12

WHT

BLU

BLU

BLU

MS-15SN -

C1

C1

INDOOR UNIT

MS-17SN -

MODELS WIRING DIAGRAM

C1

NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

2. Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

MU-15SN ­MU-17SN -

OUTDOOR UNIT

C1

C1

MODELS WIRING DIAGRAM

FROM
INDOOR UNIT
CONNECTING
220V~

SYMBOL

C1
C2

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR

NAME

TB

2

C

SYMBOL

MC

MF

COMPRESSOR(INNER PROTECTOR)
OUTDOOR FAN MOTOR(INNER PROTECTOR)

NAME NAME

14

WHT

BLU

C2

RED
ORN
WHT
BLU

C

C1

RED

MC

S

R

BLK

RED

1

ORN

2

WHT

3

BLK

4

SYMBOL

TB

MF

TERMINAL BLOCK

MS-12SN -

SYMBOL

RT12

TB

52C

SYMBOL

IC141

MF

MV

NR11

RT11

SYMBOL

C11

DSAR

F11
F12

HIC1

NAME

NAME NAME

INDOOR FAN CAPACITOR
SURGE ABSORBER
FUSE(3.15A)
THERMAL FUSE(93:)
DC/DC CONVERTER

HYBRID IC
INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR

INDOOR COIL THERMISTOR
TERMINAL BLOCK
CONTACTOR

220V~

BLU

BRN

2

60Hz

TRANS

HIC1

BRN

DSAR

GRN/YLW

LD1

REMOTE
CONTROLLER

3
1

DISPLAY
P.C.BOARD

101

CN

102

CN

151

CN

111

CN

ELECTRONIC CONTROL P.C. BOARD

4
2
1

C11

CN211

BLU

RECEIVER
P.C.BOARD

BLK

WHT

GRY
RED

RT11

MV

5

F11

33

BLU

MF

3

121

CN

CN

112

1[ 220V~

CORD

POWER
SUPPLY

TO OUTDOOR
UNIT
CONNECTING

BRN

L

L1

GRN/YLW

TB

NR11

IC141

52C

C

RT12

YLW

BRN

4

3

CN201

1

2

F12

WHT

BLU

BLU

BLU

MS-15SN -

C2

C2

INDOOR UNIT

MS-18SN -

MODELS WIRING DIAGRAM

C1

NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

2. Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

MU-15SN -

OUTDOOR UNIT

C2

MODELS WIRING DIAGRAM

FROM
INDOOR UNIT
CONNECTING
220V~

SYMBOL

C1
C2

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR

TB

2

C

SYMBOL

MC
MF

COMPRESSOR(INNER PROTECTOR)
OUTDOOR FAN MOTOR(INNER PROTECTOR)

15

VG79B123H01

WHT

C

BLU

C1

RED

MC

S

R

BLK

C2

RED
ORN
WHT
BLU

NAME NAME

RED

1

ORN

2

WHT

3

BLK

4

SYMBOL

MF

TB

TERMINAL BLOCK

VG79B175H01

MU-18SN -

C1

OUTDOOR UNIT

FROM
INDOOR UNIT
CONNECTING
220V~

MODELS WIRING DIAGRAM

TB

2

C

WHT

BLU

C1

RED

BLK

C

MC

S

R

C2

RED
ORN
WHT
BLU

SYMBOL

C1

COMPRESSOR CAPACITOR

C2

OUTDOOR FAN CAPACITOR

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

NAME

SYMBOL

MC
MF

NAME NAME
COMPRESSOR(INNER PROTECTOR)
OUTDOOR FAN MOTOR(INNER PROTECTOR)

RED

1

ORN

2

WHT

3

BLK

4

SYMBOL

MF

TERMINAL BLOCK

TB

VG79B106H01

16

MS-24SN -

SYMBOL

RT12

TB

52C

SYMBOL

IC141

MF

MV
NR11
RT11

SYMBOL

C11

DSAR

F11

F12

HIC1

NAME

NAME NAME
INDOOR FAN CAPACITOR
SURGE ABSORBER
FUSE(3.15A)
THERMAL FUSE(93:)
DC/DC CONVERTER

HYBRID IC
INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMIST OR

INDOOR COIL THERMISTOR
TERMINAL BLOCK
CONTACTOR

220V~

220V~

2

C

CN

151

CN

102

CN
101

3

5

MV

DISPLAY
P.C.BOARD

RECEIVER
P.C.BOARD

3

REMOTE
CONTROLLER

52C

RT12

IC141

112

CN

HIC1

NR11

TRANS

1

WHTWHT

DSAR

GRN/YLW

LD1

3
1

111

CN

ELECTRONIC CONTROLP.C. BOARD

4
2
1

C11

CN211

WHT

BLK

WHT

GRY
RED

RT11

F11

BLU

MF

3

121

CN

60Hz

1[ 220V~

CORD

POWER
SUPPLY

TO OUTDOOR
UNIT
CONNECTING

RED

3

GRN/YLW

TB

BLU

YLW

BRN

4
3

CN201

1

2

F12

BLU

BRN

BLU
BLU

C1

INDOOR UNIT

MODEL WIRING DIAGRAM

NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.

2. Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

MU-24SN -

OUTDOOR UNIT

C1

MODEL WIRING DIAGRAM

TB

2

220V~

FROM INDOOR

UNIT

CCONNECTING

220V~

SYMBOL

CR
C1
C2

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

2.Use copper conductors only. (For field wiring)

3. Symbols below indicate.
/: Terminal block, : Connector

CR SURGE ABSORBER
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR

NAME

C

3

5

52C

1

52C

3

52C

RED

5

78

X1

RED

3

X1

1

BLU

NAME NAME

WHT

YLW

YLW
BLU

BLU

BLU

A2/b

RED

A1/a
RED

SYMBOL

MC

MF
TB

2

4

6

6

52C

GRY

CR

COMPRESSOR(INNER PROTECTOR)
OUTDOOR FAN MOTOR(INNER PROTECTOR)
TERMINAL BLOCK

17

C2

26F1

WHT

1
2
3
4
5

RED
ORN
WHT
BLK

MF

RED
ORN
WHT
BLK
YLW YLW

6

X1

26F1

52C

FAN MOTOR RELAY
THERMOSTAT(AIRFLOW CONTROL)
CONTACTOR

SYMBOL

RED

C

MC

RS

BLK

C1

6

REFRIGERANT SYSTEM DIAGRAM

MS-09SN ­MS-09SN -

INDOOR UNIT

Indoor
heat
exchanger

Room temperature
thermistor
RT11

C1
C2

Indoor coil
thermistor
RT12

Refrigerant pipe [9.52
(Option)
(with heat insulator)

Flared connection

Flared connection

Stop valve
(with service port)

Stop valve

Compressor

Unit:mm

MU-09SN ­MU-09SN -

C1
C2

OUTDOOR UNIT

Outdoor
heat
exchanger

Strainer

MS-10SN ­MS-10SN -

INDOOR UNIT

Indoor
heat
exchanger

Room temperature
thermistor
RT11

C1
C2

Indoor coil
thermistor
RT12

Refrigerant pipe [6.35
(Option)
(with heat insulator)

Refrigerant pipe [9.52
(Option)
(with heat insulator)

Flared connection

Flared connection

Stop valve
(with service port)

Capillary tube
[3.0x[1.4x600

Compressor

Refrigerant flow in cooling

Unit:mm

MU-10SN ­MU-10SN -

C1
C2

OUTDOOR UNIT

Outdoor
heat
exchanger

Refrigerant pipe [6.35
(Option)
(with heat insulator)

Stop valve

18

Strainer

Capillary tube
[3.0x[1.6x900

Refrigerant flow in cooling

Room
temperature
thermistor RT11

Flared
connector

Flared
connector

Refrigerant pipe {6.35
(Option)
(with heat insulator)

Refrigerant pipe {15.88
(Option)
(with heat insulator)

Refrigerant flow

Compressor

Accumulator

Stop valve
(with service port)

Stop valve

Strainer

Outdoor heat
exchanger

Distributor

MU-17SN- {3.0✕{2.0✕700
MU-18SN-

{

3.0✕{2.0✕500

C1
C1

MU-15SN- {3.0✕{1.8✕550
MU-15SN-

{

3.0✕

{1.8

✕550

C1
C2

Capillary tube

Indoor heat
exchanger

Indoor coil
thermistor
RT12

MS-12SN -

Room
temperature
thermistor RT11

Flared
connector

Flared
connector

Refrigerant pipe {6.35
(Option)
(with heat insulator)

Refrigerant pipe {12.7
(Option)
(with heat insulator)

Refrigerant flow

Compressor

Stop valve
(with service port)

Stop valve

Strainer

Outdoor heat
exchanger

Distributor

{3.0✕{1.8✕500

Capillary tube

Indoor heat
exchanger

Indoor coil
thermistor
RT12

MS-12SN -

INDOOR UNIT

Unit:mm

C1
C2

MU-12SN ­MU-12SN -

C1
C2

OUTDOOR UNIT

MS-15SN ­MS-15SN ­MS-17SN ­MS-18SN -

C1
C2
C1
C1

INDOOR UNIT

19

Unit:mm

MU-15SN ­MU-15SN ­MU-17SN ­MU-18SN -

C1
C2
C1
C1

OUTDOOR UNIT

MS-24SN -

INDOOR UNIT

Indoor heat
exchanger

RT11
Room
temperature
thermistor

C1

Indoor coil
thermistor
RT12

Refrigerant pipe [15.88
(Option)
(with heat insulator)

Flared
connector

Flared
connector

Stop valve
(With service port)

Accumulator

[3.0 350[1.6

Discharge pressure

Compressor

regulator open

2.55MPa(26.0kgf/F)
Strainer

Unit:mm

MU-24SN -

C1

OUTDOOR UNIT

Outdoor heat
exchanger

Refrigerant pipe [9.52

Stop Valve

(Option)
(with heat insulator)

[3.0 600

[2.0

[3.0 100[2.0

Flow of refrigerant

20

MAX. REFRIGERANT PIPING LENGTH

Refrigerant piping

Max. length : m

C1
C2
C1
C2
C1
C2

C1
C2
C1
C1
C1

A

15

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN ­MS-12SN ­MS-12SN ­MS-15SN ­MS-15SN ­MS-17SN ­MS-18SN ­MS-24SN -

Model

C1
C2
C1
C2
C1
C2

C1
C2
C1
C1
C1

MU-09SN ­MU-09SN ­MU-10SN ­MU-10SN ­MU-12SN ­MU-12SN ­MU-15SN ­MU-15SN ­MU-17SN ­MU-18SN ­MU-24SN -

Piping size O.D : mm Length of connecting pipe : m

Gas Liquid Indoor unit Outdoor unit

{9.52

{12.7



{15.88

{6.35







Gas 0.43
Liquid 0.5

Gas 0
Liquid 0

{9.52

MAX. HEIGHT DIFFERENCE

Indoor
unit

w Height difference should be within

7.5m regardless of which unit,
indoor or outdoor position is high.

w Max. Height
difference 7.5m

ADDITIONAL REFRIGERANT CHARGE(R22 : g)

Outdoor unit

precharged

C1
C2

C1
C2
C1
C2
C1
C2
C1
C1
C1

800

820
1200
1300

1350
1400
2150

7m

0

8m

15

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN ­MS-12SN ­MS-12SN ­MS-15SN ­MS-15SN ­MS-17SN ­MS-18SN ­MS-24SN -

Model

C1
C2
C1
C2
C1
C2

C1
C2
C1
C1
C1

MU-09SN ­MU-09SN ­MU-10SN ­MU-10SN ­MU-12SN ­MU-12SN ­MU-15SN ­MU-15SN ­MU-17SN ­MU-18SN ­MU-24SN -

Refrigerant Piping

Max.length

A

Refrigerant piping length (one way)

9m3010m

11m6012m7513m9014m

45

Outdoor unit

105

15m

120

21

7

Wet-and dry-bulb
thermometers

Wet-and dry-bulb
thermometers

MS-10SN-

MS-12SN-

MS-12SN-

MS-15SN-

MS-15SN-

MS-18SN-

MS-17SN-

10.3

9.4

8.6

7.7

6.9

6.2

15.0

MS-24SN-

13.6

12.3

11.1

9.8

8.7

10.9

10.0

9.1

8.2

7.3

6.5

8.4

7.7

7.0

6.3

5.7

5.1

9.0

8.2

7.5

6.8

6.1

5.4

MS-10SN-

MS-09SN-

MS-09SN-

12.4

11.3

10.2

9.2

8.2

7.3

PERFORMANCE CURVES

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

C1

MS-12SN -

C2

MS-12SN -

C1

MS-15SN -

C2

MS-15SN -

C1

MS-17SN -

C2

MS-18SN -

C1

MS-24SN -

C2

C1

MU-09SN -

C1

MU-09SN -

C1

MU-10SN ­MU-10SN -

C1

MU-12SN -

C2

MU-12SN -

C1

MU-15SN -

C2

MU-15SN -

C1

MU-17SN -

C2

MU-18SN -

C1

MU-24SN -

C2

C1
C1
C1

The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions,
since operating conditions vary according to the areas where these units are installed. The following information has been pro­vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

198 ~ 242V

,60Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature : °CWB
(2) Indoor outlet air wet-bulb temperature : °CWB
(3) Outdoor intake air dry-bulb temperature : °CDB
(4) Total input: W
Indoor air wet/dry-bulb temperature difference on the left side of the chart on this page shows the difference between the
indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

How to measure the indoor air wet-bulb/dry-bulb temperature difference

1. Attach at least 2 sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air
speed is high.

2. Attach at least 2 sets of dry-bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.

3. Check that the air filter is cleaned.

4. Open windows and doors of the room.

5. Press the EMERGENCY OPERATION switch once to start the EMERGENCY COOL MODE.

6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.

7. 10 minutes later, measure temperature again and check that the temperature does not change.

INDOOR UNIT

22

OUTDOOR UNIT

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

15 2050256030

70(%)

35(:)

2.5

3.0

3.5

4.0

4.5

18

32

15 20

50

25
60

30
70(%)

35(:)

0.3

0.4

0.5

0.6

0.7

18

32

7

6

5

4

3

18

32

7

6

5

4

3

2

15 20

50

256030

70(%)

35(:)

0.2

0.3

0.4

0.5

0.6

0.7

18 3215 2050256030

70(%)

35(:)

2.5

3.0

3.5

4.0

4.5

15 20

50

25
60

30
70(%)

35(:)

0.3

0.4

0.5

0.6

0.7

18 32

0.2

7

6

5

4

3

2

7.0

6.0

5.0

4.0

3.0

2.0
15 2050256030

70(%)

35(:)

18 32

COOL operation

① Both indoor and outdoor unit are under the same temperature/humidity condition.

Dry-bulb temperature(:)

Relative humidity(%)
20 50
25 60
30 70

➁ Air flow should be set at MAX.
③ The unit of pressure has been changed to MPa on the international system of units(SI unit system).

The conversion factor is : 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])

(kgf/F[Gauge])(MPa[Gauge])

Outdoor low pressure

Ambient temperature(˚C)
Ambient humidity(%)

(kgf/F[Gauge])(MPa[Gauge])

MU-09SN ­MU-09SN -

MU-10SN ­MU-10SN -

C1
C2

MU-09SN ­MU-09SN -

Outdoor unit current (A)

Ambient temperature(˚C)
Ambient humidity(%)

C1
C2

MU-10SN ­MU-10SN -

C1
C2

C1
C2

Outdoor low pressure

Ambient temperature(˚C)
Ambient humidity(%)

(kgf/F[Gauge])(MPa[Gauge])

Outdoor low pressure

MU-12SN ­MU-12SN -

Ambient temperature(˚C)
Ambient humidity(%)

Outdoor unit current (A)

Ambient temperature(˚C)
Ambient humidity(%)

C1
C2

MU-12SN ­MU-12SN -

C1
C2

Outdoor unit current (A)

Ambient temperature(˚C)
Ambient humidity(%)

23

15 20

50

25
60

30
70(%)

35(:)

18 32

0.3

0.4

0.5

0.6

0.7

0.2

3

4

5

6

7

2

14.0

13.0

12.0

11.0

10.0

9.0
15 20

50

25
60

30
70(%)

35(:)

18

32

8.0

7.0

6.0

5.0

4.0

3.0
15 20

50

25
60

30
70(%)

35(:)

18 32

15 205025

60

30
70(%)

35(:)

3

4

5

6

7

18

32

2

0.3

0.4

0.5

0.6

0.7

0.2

8.0

7.0

6.0

5.0

4.0

3.0
15 205025

60

30
70(%)

35(:)

18

32

15 20

50

25
60

30
70(%)

35(:)

18

32

0.3

0.4

0.5

0.6

0.7

0.2

3

4

5

6

7

2

(kgf/F[Gauge])(MPa[Gauge])

15

18 20

50

2560 30 32

70(%)

35(:)

5.0

6.0

7.0

8.0

9.0

10.0

18

32

3

4

5

6

7

2

15 20

25

30

70(%)

35(:)

0.2

0.3

0.4

0.5

0.6

0.7

MU-15SN ­MU-15SN -

C1
C2

MU-15SN ­MU-15SN -

C1
C2

Outdoor low pressure

Ambient temperature(˚C)
Ambient humidity(%)

(kgf/F[Gauge])(MPa[Gauge])

Outdoor low pressure

Ambient temperature(˚C)
Ambient humidity(%)

(kgf/F[Gauge])(MPa[Gauge])

MU-17SN -

MU-18SN -

Outdoor unit current(A)

Ambient temperature(˚C)
Ambient humidity(%)

C1

MU-17SN -

C1

Outdoor unit current(A)

Ambient temperature(˚C)
Ambient humidity(%)

C1

MU-18SN -

C1

Outdoor low pressure

Ambient temperature(˚C)
Ambient humidity(%)

(kgf/F[Gauge])(MPa[Gauge])

Outdoor low pressure

MU-24SN -

Ambient temperature(˚C)
Ambient humidity(%)

Outdoor unit current(A)

Ambient temperature(˚C)
Ambient humidity(%)

C1

MU-24SN -

C1

Outdoor unit current(A)

Ambient temperature(˚C)
Ambient humidity(%)

24

8

Approx. 2 :
or more

Difference
between target
temperature
and room
temperature

Approx. 2 :
or less

This shows that the
air conditioner is
operating to reach
the target temperature.
Please wait until the
target temperature is
obtained.

This shows that the
room temperature is
approaching the
target temperature.

Operation stateIndication

lighted

not lighted

•The following indication applies regardless of shape of the indicator.

Operation Indicator

COOL mode of

"I FEEL CONTROL"

DRY mode of

"I FEEL CONTROL"

Initial room temperature

25: or more

more than 13:,

less than 25:

Mode

ON/OFF

FAN

TOO

WARM

TOO

COOL

VANE

MODE

ECONO COOL

STOP

START

HR.

MIN.

I FEEL

COOL

DRY

PM

CLOCK

AM

RESET

CLOCK

FAN

OPERATION SELECT button

FAN SPEED CONTROL button

OFF-TIMER button

HR. button

MIN. button

(TIME SET button)

ON-TIMER button

RESET button

ECONO COOL button

VANE CONTROL button

CLOCK SET button

ON/OFF

TOO

COOL

PM

AM

TOO

WARM

Signal transmitting section

Operation display section

OPERATE /STOP
(ON /OFF)button

TEMPERATURE buttons

MICROPROCESSOR CONTROL

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

C1

MS-12SN -

C2

MS-12SN -

C1

MS-15SN -

C2

MS-15SN -

C1

MS-17SN -

C2

MS-18SN -

C1

MS-24SN -

C2

WIRELESS REMOTE CONTROLLER

C1

MU-09SN -

C1

MU-09SN -

C1

MU-10SN ­MU-10SN -

C1

MU-12SN -

C2

MU-12SN -

C1

MU-15SN -

C2

MU-15SN -

C1

MU-17SN -

C2

MU-18SN -

C1

MU-24SN -

C2

Once the operation mode are set, the same operation mode
can be repeated by simply turning the
OPERATE/STOP(ON/OFF) button ON. Indoor unit receives
the signal with a beep tone.
When the system turns off, 3-minute time delay will operate to
protect system from overload and compressor will not restart
for 3 minutes.

8-1. “I FEEL CONTROL” ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button on the remote

controller. OPERATION INDICATOR lamp of the indoor
unit turns on with a beep tone.

(2) Select “I FEEL CONTROL”( ) mode with the OPERA-

TION SELECT button.

(3) The operation mode is determined by the room tempera-

ture at start-up of the operation.

● Once the mode is fixed, the mode does not change by
room temperature afterwards.

● Under the ON-TIMER ( ) operation, mode is deter-
mined according to the room temperature at set time the
operation starts.

● When the system is stopped on the remote controller
and restarted within 2 hours in “I FEEL CONTROL” ( )

mode, the system operates in previous mode automati­cally regardless of the room temperature.

C1
C1
C1

Operation Indicator lamp

The operation indicator located at the right side of the
indoor unit indicates the operation state.

INDOOR UNIT DISPLAY SECTION

Operation time chart

Example

Previous operation

COOL mode of
“I FEEL CONTROL”

Restart

COOL mode of
“I FEEL CONTROL”

or COOL mode

When the system is restarted after 2 hours and more,
the operation mode is determined by the room tempera­ture at start-up of the operation.

Operation time chart
Example

Previous operation

COOL mode of
“I FEEL CONTROL”

or COOL mode

Restart

COOL or DRY mode of
“I FEEL CONTROL”
that determined by
room temperature at
start-up of the opera­tion.

25

Mode

COOL mode of

"I FEEL CONTROL"

DRY mode of

"I FEEL CONTROL"

Initial room temperature

Initial set temperature

more than 13:, less than 25:

24:

Initial room temperature
minus 2:

Initial room temperature
minus 2:

❈1

26: or more

25: to 26:

(4) The initial set temperature is decided by the initial room temperature.

TOO

COOL

TOO

WARM

❈1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-

less of the room temperature at restart.
The set temperature is calculated by the previous set temperature.

(5) TEMPERATURE buttons

In “I FEEL CONTROL” ( ) mode, set temperature is decided by the microprocessor based on the room temperature.
In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too
warm. Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a
beep tone.

● Fuzzy control

When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering
the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat
or cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.
In DRY mode of “I FEEL CONTROL”, the set temperature doesn’t change.

…

To raise the set temperature 1~2 degrees(°C)

…

To lower the set temperature 1~2 degrees(°C)

8-1-1. COOL mode of “I FEEL CONTROL”

1. Indoor fan speed control

Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regard­less of thermostat’s OFF-ON.

In Auto the fan speed is as follows.

MS-09/10/12/15/17/24SN-

C1

Room temperature minus set temperature : 2 degrees or more·······························High
Room temperature minus set temperature : Between 1 and 2 degrees···················Med.
Room temperature minus set temperature : less than 1 degree·······························Low

MS-09/10/12/15SN- , MS-18SN-

C1C2

Room temperature minus set temperature : 1.7 degrees or more·······························High
Room temperature minus set temperature : Between 1 and 1.7 degrees···················Med.
Room temperature minus set temperature : less than 1 degree··································Low

2. Coil frost prevention

① Temperature control

When the indoor coil thermistor RT12 reads 4°C or below(MS-09/10SN) / -1°C or below(MS-12/15/17/18/24SN) for 5 min­utes, the coil frost prevention mode starts.

The indoor fan operates at the set speed and the compressor stops for 5 minutes.
After that, if RT12 still reads below 4°C(MS-09/10SN) / or below -1°C(MS-12/15/17/18/24SN), this mode is prolonged until
the RT12 reads over 4°C(MS-09/10SN) / -1°C(MS-12/15/17/18/24SN).

② Time control

When the three conditions as follows have been satisfied for 1 hour and 45 minutes, the compressor stops for 3 minutes.

The indoor fan operates at the set speed.
a. Compressor has been continuously operating.
b. Indoor fan speed is Low or Med..
c. Room temperature is below 26°C.

Initial temperature difference

Initial temperature difference

26

Fan speed

Fan speed

Difference between room
temperature and set tem­perature during operation

2 deg.

4 deg.

1.7 deg.

1 deg.

Difference between room
temperature and set tem­perature during operation

3 deg.

1.7 deg.

1 deg.

When compressor stops, the accumulated time is cancelled. When compressor restarts, time counting starts from the

Outdoor fan speed

High

Low

Temperature of thermostat 26F1

28.5:

31:

beginning.
Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds
26°C. However, when two of the above conditions (b.and c.) are satisfied again, time accumulation is resumed.

Operation chart

Example

ON

ON

Compressor
Outdoor fan

Indoor fan

3. Outdoor fan speed control MU-24SN

Outdoor fan speed is controlled according to the temperature of thermostat 26F1.
Outdoor fan High operation : Until the outside temperature decrease 28.5:.

Outdoor fan Low operation : When the outside temperature decrease to 28.5:.

8-1-2. DRY mode of “I FEEL CONTROL”

The system for dry operation uses the same refrigerant circuit as the cooling circuit.
The compressor and the indoor fan are controlled by the room temperature.

By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.

1. Indoor fan speed control

Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto fan speed becomes Low.

2. The operation of the compressor and indoor / outdoor fan

Compressor operates by room temperature control and time control.
Set temperature is controlled to fall 2°C from initial room temperature.
Indoor fan and outdoor fan operate in the same cycle as the compressor.

● When the room temperature is 23°C or over.
When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

● When the room temperature is under 23°C.
When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

OFF

ON

( continuously at set speed)

When the outside temperature goes to 31:.
Until the outside temperature goes to 31:.

OFF

Operation time chart

Example

Thermostat

Indoor fan

Outdoor fan
Compressor

3. Coil frost prevention

The operation is as same as coil frost prevention during COOL mode of “I FEEL CONTROL” operation.(Refer to 8-1-1.
COOL mode of “I FEEL CONTROL” 2.)
However when coil frost prevention works while the indoor fan is OFF, it’s speed becomes set speed.

OFF

OFF

8-2. COOL ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.

(2) Select COOL mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.

The setting range is 16 ~ 31°C.

ON

OFF

OFFOFF

OFF

ON

ON

3 min.

ON

OFF

ON

OFF

4 min.

27

ON

ON

8 min. 1 min.

ON

35

30

25

20

15

10

:

10 15 20 25 30 35

Set temperature

Initial room temperature

Set temperature and
initial room temperature in dry mode

:

High

Med.

Low

High

Time

1. Indoor fan speed control

Indoor fan speed control is as same as COOL mode of “I FEEL CONTROL”.(Refer to 8-1-1. COOL mode of I FEEL CON-

TROL” 1.)

2. Coil frost prevention

Coil frost prevention is as same as COOL mode of “I FEEL CONTROL”.(Refer to 8-1-1. COOL mode of I FEEL CONTROL”

2.)

8-3. DRY ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns on with a

beep tone.
(2) Select DRY mode with the OPERATION SELECT button.
(3) The microprocessor reads the room temperature and determines

the set temperature. Set temperature is as shown on the right chart.

DRY operation will not function when the room temperature is 13°C

or below.
(4) When DRY operation functions the fan speed is lower than cool
operation expect at (fan speed) Low notch.

1. Indoor fan speed control

Indoor fan speed control is as same as DRY mode of “I FEEL CON-

TROL”.(Refer to 8-1-2. DRY mode of I FEEL CONTROL” 1.)

2. The operation of the compressor and indoor / outdoor fan

The operation of the compressor and indoor / outdoor fan is as same
as DRY mode of “I FEEL CONTROL”.(Refer to 8-1-2. DRY mode of
I FEEL CONTROL” 2.)

3. Coil frost prevention

Coil frost prevention is as same as DRY mode of “I FEEL CONTROL”.(Refer to 8-1-2. DRY mode of I FEEL CONTROL” 3.)

8-4. FAN ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select FAN mode with the OPERATION SELECT button.
(3) Select the desired fan speed. When AUTO, it becomes Low.

Only indoor fan operates.
Outdoor unit does not operate.

8-5. FAN MOTOR CONTROL

(1) Rotational frequency feedback control

The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback
the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High, Med., Low),
the microprocessor controls SR141 (MS-09/10SN) IC141 (MS-12/15/17/18/24SN) and adjusts fan motor electric current to
make the current rotational frequency close to the target rotational frequency. With this control, when the fan speed is
switched, the rotational frequency changes smoothly.

(2) Fan motor lock-up protection

When the rotational frequency feedback signal is not output for 12 seconds, (or when the microprocessor cannot detect
the signal for 12 seconds) the fan motor is regarded locked-up. Then the electric current to the fan motor is shut off. 3 min­utes later, the electric current is applied to the fan motor again. During the fan motor lock-up, the OPERATION INDICA­TOR lamp flashes on and off to show the fan motor abnormality. (Refer to page 35.)

8-6. AUTO VANE OPERATION

(1) Vane motor drive

These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor.

(2) The horizontal vane angle and mode changes as follows by pressing the VANE CONTROL button.

28

(3) Positioning

The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle.
Confirming of standard position is performed in case of follows.
(a) When the OPERATE / STOP(ON / OFF) button is pressed.
(b) When the vane control is changed from AUTO to MANUAL.
(c) When the SWING is finished.
(d) When the test run starts.
(e) When the power supply turns ON.

(4) VANE AUTO ( ) mode

In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room-temper­ature distribution.

1 In COOL and DRY operation

Vane angle is fixed to Angle 1.

2 In FAN operation

Vane angle is fixed to Angle 4.

(5) Dew prevention

During COOL or DRY operation at Vane Angle 4 or 5 when the cumulative operation time of compressor exceeds 1
hour, the vane angle automatically changes to Angle 1 for dew prevention.

(6) SWING MODE ( )

By selecting SWING mode with the VANE CONTROLbutton, the horizontal vane swings vertically. The remote controller
displays “ ”.

(7) ECONO COOL ( ) operation (ECONOmical operation)

When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that in
COOL mode.
Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(RT12).
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that
in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved.
ECONO COOL operation is cancelled when the ECONO COOL button is pressed once again or VANE CONTROL but­ton is pressed or change to other operation mode.

NOTE : ECONO COOL operation not work in COOL mode of “I FEEL CONTROL”.

SWING operation

In swing operation of ECONO COOL mode, the initial air flow direction is adjusted to “Horizontal”.
According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is
decided. Then when the downward blow has been finished, next horizontal blow time is decided.
For initial 10 min. the swing operation is performed in table G~H for quick cooling.
Also, after 10 min. when the difference of set temperature and room temperature is more than 2 degrees, the swing
operation is performed in table D~H for more cooling.
The air conditioner repeats the swing operation in various cycle as follows.

Temperature of indoor coil

thermistor RT12 (:)

A
B

C
D

E
F

G

H

15°C or less
15°C to 17°C

17°C to 18°C

18°C to 20°C

20°C to 21°C
21°C to 22°C
22°C to 24°C

more than 24°C

Downward blow time

(sec.)

2
5
8

11
14
17

20
23

Horizontal blow time

(sec.)

23
20
17
14

11

8

5
2

29

8-7. TIMER OPERATION

PM

AM

PM

PM

1. How to set the timer

(1) Press OPERATE/STOP(ON/OFF) button to start the air conditioner.
(2) Check that the current time is set correctly.

NOTE : Timer operation will not work without setting the current time. Initially “AM 0:00” blinks at the current time display of

TIME MONITOR, so set the current time correctly with CLOCK SET button.

(3) Press ON or OFF TIMER buttons to select the operation.

ON-TIMER button... AUTO START operation (ON timer)
OFF-TIMER button... AUTO STOP operation (OFF timer)

(4) Press HR. and MIN. button (TIME set button) to set the timer. Time setting is 10-minute units.

HR. and MIN. button will work when “ ” or “ ” mark is flashing.
These marks disappear in 1 minute.
After setting the ON timer, check that OPERATION INDICATOR lamp of the indoor unit lights.

NOTE1 : Be sure to place the remote controller at the position where its signal can reach the air conditioner even during

TIMER operation, or the set time may deviate within the range of about 10 minutes.

NOTE2 : Reset the timer in the following cases, or the set time may deviate and other malfunctions may occur.

● A power failure occurs.

● The circuit breaker functions.

2. Cancel

TIMER setting can be cancelled with the ON or OFF TIMER buttons.

To cancel the ON timer, press the ON-TIMER button.

To cancel the OFF timer, press the OFF-TIMER button.

TIMER is cancelled and the display of set time disappears.

PROGRAM TIMER

● The OFF timer and ON timer can be used in combination.

● “ ” and “ ” display shows the order of the OFF timer and ON timer operation.

(Example 1) The current time is 8:00 PM.

The unit turns off at 11:00 PM, and on at 6:00 AM.

(Example 2) The current time is 11:00 AM.

The unit turns on at 5:00 PM, and off at 9:00 PM.

NOTE : TIMER setting will be cancelled by power failure or breaker functioning.

30

8-8. EMERGENCY-TEST OPERATION

In case of test run operation or emergency operation, use the EMERGENCY OPERATION switch on the front of the
indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote
controller run down. The unit will start and the OPERATION INDICATOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan speed runs at
High speed and the system is in continuous operation. (The thermostat is ON.)
After 30 minutes of test run operation the system shifts to EMERGENCY COOL MODE with a set temperature of 24°C.
The fan speed shifts to Med. speed.
The coil frost prevention works even in emergency operation.

In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode.
Emergency operation continues until the EMERGENCY OPERATION switch is pressed again or the unit receives any sig­nal from the remote controller. In case of latter normal operation will start.

NOTE : Do not press the EMERGENCY OPERATION switch during normal operation.

MS-09/10SN

MS-12/15/17/18/24SN

•The following indication applies
regardless of shape of the indicator.

OPERATION INDICATOR lamp

Press once <Cool>

Press once again <Stop>

EMERGENCY OPERATION switch

EMERGENCY OPERATION switch

31

No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit

1 unit operation
No modification

–
–
–

2 units operation

Same as at left

Solder J1

–
–

3 units operation

Same as at left
Same as at left

Solder J2

–

4 units operation

Same as at left
Same as at left
Same as at left

Solder both J1 and J2

9

SERVICE FUNCTIONS

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

C1

MS-12SN -

C2

MS-12SN -

C1

MS-15SN -

C2

MS-15SN -

C1

MS-17SN -

C2

MS-18SN -

C1

MS-24SN -

C2

C1

C1

C1

9-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.
The time will be shortened as follows. (Refer to page 40 or 41.)
Set time : 1-minute ➔ 1-second

Set time : 3-minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is

shortened by short circuit of JPG and JPS.)

9-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION

A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.

How to modify the remote controller P.C. board

Remove batteries before modification. The board has a print as shown below :

The P.C.board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, push the RESET button.

Table 1

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the
remote controller for the indoor unit.
The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they
are set.
The setting will be cancelled if the breaker has turned off, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.

32

NOTE : For remodelling, take out the batter-

ies and push the
OPERATE/STOP(ON/OFF) button
twice or 3 times at first.
After finish remodelling, put back
the batteries then push the RESET
button.

C111

CN201

C11

CN211

IC152

CN151

SW1

CN112

CN121

IC101

CN111

JR07

52C

MS-09/10SN

IC141

C11

CN211

CN101

CN151

SW

CN111

CN121

IC101

JR06

52C

MS-12/15/17/18/24SN

RA102

RA102

CN201

BZ

CN102

CN112

9-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C.board. The “AUTO RESTART FUNCTION” sets to work the moment the
power has restored after power failure. Then, the unit will restart automatically. However if the unit is operated in “I FEEL
CONTROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is
decided by the initial room temperature.

How to set “AUTO RESTART FUNCTION”

1 Turn off the main power for the unit.
2 Pull out the indoor electronic control P.C. board and the display P.C.board. (Refer to page 42 or 44.)
3 Cut the RESISTOR JR07(MS-09/10SN) or JR06(MS-12/15/17/18/24SN) on the indoor electronic control P.C.board.

(Refer to page 40 or 41.)

Operation

1 If the main power (220V AC) has been cut, the operation settings remain.
2 After the power is restored, the unit restarts automatically according to the memory.(However, it takes at least 3 minutes

for the compressor to start running.)

NOTE

•The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote

controller.

•If the main power is turned off or a power failure occurs while AUTO START/STOP timer is active, the timer setting is

cancelled.

•If the unit has been off with the remote controller before power failure, the auto restart function does not works as the

power button of the remote controller is off.

•To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same

time.

•When some air conditioners are connected to the same supply system, if they are operated before power failure, the

starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current
by adding to the system that allows the units to start one by one.

33

10 TROUBLESHOOTING

Lead wiring

Housing point

Insert the negative pole
of the batteries first.
Check if the polarity of
the batteries is correct.

RESET button

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

C1

MS-12SN -

C2

MS-12SN -

C1

MS-15SN -

C2

MS-15SN -

C1

MS-17SN -

C2

MS-18SN -

C1

MS-24SN -

C2

C1

MU-09SN -

C1

MU-09SN -

C1

MU-10SN ­MU-10SN -

C1

MU-12SN -

C2

MU-12SN -

C1

MU-15SN -

C2

MU-15SN -

C1

MU-17SN -

C2

MU-18SN -

C1

MU-24SN -

C2

10-1. Cautions on troubleshooting

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for mis-wiring.

2. Take care the following during servicing.

1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after
confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

2) Be sure to unplug the power supply cord before removing the front panel, the cabinet, the top panel, and the electron­ic control P.C. board.

3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.

4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.

To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2) Before servicing check that the connector and terminal are connected properly.

3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and

the components for bursting and discoloration.

4) When troubleshooting, refer to the flow chart and the check table on page 35.

4. How to replace batteries

Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
1 Remove the front lid and insert batteries.

Then re-attach the front lid.

2 Press the RESET button with tip end of ball point pen

or the like, and then use the remote controller.

C1

C1

C1

NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.

34

10-2. Instruction of troubleshooting

•The following indication applies regardless of shape of the indicator.

Operation Indicator

flashing

Start

Indoor unit
operates.
Outdoor unit
doesn't
operate.

Indoor unit
doesn't receive
the signal from
remote controller.

OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.

Outdoor unit
operates in
only Test Run
operation.

Outdoor unit
doesn't
operate
even in
Test Run
operation.

Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.

Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.

Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage" on
page 40 or 41.

Refer to D
"Check of
outdoor unit"
on page 38
or 39.

Refer to B
"Check of
remote controller
and power
monitor, receiver
P.C. board"
on page 37.

1. Check indoor /
outdoor
connecting wire.

2. Refer to C
"Check of indoor
electronic control
P.C. board"
on page 38.

2-time flash
Cause:
Indoor unit

• Trouble of
room temp­ erature/
indoor coil
thermistor

3-time flash
Cause:
Indoor unit

• Trouble of
indoor fan
motor

Check room
temperature
thermistor and
indoor coil
thermistor.
Refer to "Test
point diagram
and voltage" on
page 40 or 41.

Refer to A
"Check of
indoor fan
motor"
on page 37.

1. Troubleshooting check table

NOTE : Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.

Self check table

Abnormal

NO.

point

Indoor coil

thermistor

1

Room
tempera­ture ther­mistor

Indoor fan

2

motor

2-time flash

3-time flash

Indication

2.5-second OFF

2.5-second OFF

· Flashing of the OPERATION INDICATOR lamp (on the left-hand side)
indicates possible abnormalities.

· The OPERATION INDICATOR lamp (on the left-hand side) is lighting
during normal operation.

Symptom

Outdoor unit
does not run.

Indoor fan motor
repeats 12 sec­onds ON and 3
minutes OFF.
When the indoor
fan motor
breaks, the fan
keeps stopping.

35

Detect method

Detect Indoor coil/room tem­perature thermistor short or
open circuit every 8 seconds
during operation.

When rotational frequency
feedback pulse signal is not
emit during 12-second indoor
fan operation.

● Check resistance of thermistor.

● Re-connect connector.

● Check indoor electronic control P.C.board.

● Disconnect connector CN211 and then

check connector CN121 - to make
sure rotational frequency feedback signal
of 1.5V or over exists.

● Check indoor electronic control P.C.
board.

● Check indoor fan motor.

● Re-connect connector.

Check point

2

3

RED

YLW
BRN

ORN

GRN

ROTOR

P

R

C

S

RED

BLK

WHT

MAINAUX.

2. Trouble criterion of main parts

BLK

FUSE

WHT

RED

B
R
N

G
R
Y

Y

L

W

RED

ORN

WHT

MU-24SN

BLKYLW

P

WHTRED

BLK

MAIN

AUX.

P

WHTRED

BLK

MAIN
AUX.

P

MU-15/17/18SN

MU-09/10/12SN

ORN

C1

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

MS-12SN -

C2

MS-12SN -

C1

MS-15SN -

C2

MS-15SN -

Part name

Room
temperature
thermistor(RT11)

Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)

Indoor coil
thermistor(RT12)

Compressor
(MC)

INNER
PROTECTOR

MU-09/10/12/15SN

i10: CLOSE

90

150i 5: OPEN

MU-17/18SN

95i10: CLOSE

150i10: OPEN

MU-24SN

102i15: CLOSE
165i 8: OPEN

Measure the resistance between the terminals with a tester.
(Coil wiring temperature 10°C ~ 40°C)

Terminal

MU-09SN MU-10SN MU-12SN MU-15SN MU-17SN MU-18SN MU-24SN

2.81~3.45Ω 2.41~2.96Ω 1.9~2.34Ω 1.48~1.82Ω 1.45~1.79Ω 1.21~1.49Ω 0.73~0.90Ω

C-R
C-S

3.13~3.83Ω 3.33~4.08Ω 2.74~3.36Ω 2.45~3.0Ω 2.35~2.89Ω 2.25~2.75Ω 1.61~1.97Ω

Measure the resistance between the terminals with a tester.
(Coil wiring temperature10°C ~ 30°C)

lead wire

Indoor fan
motor(MF)

Motor part

WHT-BLK

BLK-RED

INNER FUSE

MS-09/10SN

136i3: CUT OFF

MS-12/15/17/18/24SN

145i2: CUT OFF

Measure the voltage Power ON.

Color of lead wire

BRN-YLW

Sensor part

YLW-GRY

C1

C2

C1

C2

Color of

C1

MS-17SN ­MS-18SN ­MS-24SN -

MU-09SN -

C1

MU-09SN -

C1

MU-10SN ­MU-10SN -

Check method and criterion

Normal

8kΩ ~ 20kΩ

Normal

Normal

MS-09/10SN

321~349Ω 113~123Ω
307~333Ω

Normal

4.5 ~ 5.5V

(When fan revolved one time)

0V➔5V➔0V

(Approx.)

MS-12/15/17/18/24SN

C1

MU-12SN -

C2

MU-12SN -

C1

MU-15SN -

C2

MU-15SN -

Abnormal

Open or short-circuit

155~169Ω

Abnormal

Remain 0V or 5V

Abnormal

Open or

short-circuit

Abnormal

Open or

short-circuit

C1

MU-17SN -

C2

MU-18SN -

C1

MU-24SN -

C2

C1

C1

C1

Figure

Measure the resistance between the terminals with a tester.
(Coil wiring temperature 10°C ~ 40°C)

Color of

lead wire

WHT-BLK

BLK-RED

MU-09SN
149~183Ω
199~244Ω

BLK-YLW

Outdoor fan
motor(MF)

INNER
PROTECTOR

MU-09/10/12SN

95i15: CLOSE

135i 5: OPEN

MU-15/17/18SN

120i 5: OPEN

MU-24SN

135i 5: OPEN

Measure the resistance between the terminals with a tester.

Vane motor(MV)

(Part temperature10°C ~ 30°C)

MS-09/10SN 282 ~ 306Ω

MS-12/15/17/18/24SN 358 ~ 387Ω

MU-10/12SN
132~162Ω
233~286Ω

Normal

Normal

MU-15SN

102~126Ω

97~120Ω

36

MU-17/18SN
102~126Ω

97~120Ω

71.5~87.5Ω

90.2~110.2Ω

Open or short-circuit

MU-24SN

81.3~99.4Ω

Abnormal

Abnormal

Open or

short-circuit

PP

:INNER PROTECTOR

When OPERATION INDICATOR lamp flashes 3-time.
Indoor fan motor doesn’t operate.

A

Check of indoor fan motor

Turn OFF the power supply.
Check connector CN211 visually.

No

Re-connect the lead wires.

Are lead wires connected?

Disconnect lead wires from connector CN211 on indoor electronic control P.C. board.
Measure resistance between lead wires No.1 and No.3 and then No.2 and No.3(MS-09/10SN)

Yes

{

No.1 and No.4 and then No.1 and No.2(MS-12/15/17/18/24SN)

Is resistance 0 (short circuit) or ∞ (open circuit)?

Yes ( 0 or ∞ )

Repair the indoor fan motor.

Replace the indoor electronic control P.C. board.

Is soldered point of connector normal?

Yes

Insert screwdriver into air outlet to
rotate indoor fan motor slowly for 1
revolution or over, and measure

No

voltage between YLW and GRY of

(others)

CN121.

No

Does voltage repeat 0V

Yes

Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate
with the remote controller.

Check of remote controller and power monitor, receiver P.C. board

B

Switch on the remote controller.

w Check the remote controller is exclusive

for this air conditioner.

Is LCD display on the remote con­troller visible?

Yes

Remove the batteries, then set them back
and press the RESET button. Check if the
unit operates with the remote controller.

No
(not clear)

Replace the batteries.(Refer to page 34.)

w In case of replacing the receiver P.C.

board of MS-09SN or MS-10SN replace
the indoor electronic control P.C. board
with it because they are unified.

No

Re-solder it.

}

DC and more than 5V?

Does the unit operate with the
remote controller?

Yes

OK

No

(MS-09/10SN)

Replace the indoor electronic control P.C.
board with power monitor, receiver P.C. board.

No

Turn on a radio to AM and press switch on
the remote controller.

Is noise heard from radio?

Yes

Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?

No

(MS-12/15/17/18/24SN)

Measure the voltage between indoor receiver P.C. board connector No.2
No.1 when remote controller button is pressed.

Is the voltage approx. 4V DC?

No(5V or 0V DC)

Replace the receiver P.C. board.

No

Yes

Yes

37

Replace the remote controller.

• Re-install the unit away from lights.

• Attach a filter on receiving part.

(+)

and

Replace the indoor electronic control P.C.
board.

Replace the fuse.

Is fuse(F11) blown?

Be sure to check both fuse
and varistor in any case.

Replace the fan motor.

Replace the
indoor electronic
control P.C. board.

Is winding resistance
of fan motor 0 "?

Is winding resistance
of vane motor 0 "?

No

Yes

Replace the vane motor.

No

Yes

Yes

Is varistor(NR11) burnt?

Replace the varistor.

Yes

Turn OFF the power supply.
Remove indoor fan motor connector CN211 and
vane motor connector CN151 from the indoor electronic
control P.C. board and turn ON the power supply.

No

No

Yes

No

Is resistance approx. 0"?

Replace the fuse (F12).

CN201

1
2

L1

F12

1

3

Terminal
block

Be sure to check both resistances.

No (∞)

Yes

Turn OFF the
power supply.

Turn OFF the
power supply.

Check both “parts side”and “pattern side” of indoor
electronic control P.C. board visually.

Does the unit operate with the remote controller?
Does the OPERATION INDICATOR lamp light up
by pressing the EMERGENCY OPERATION switch?

Measure the
resistance between
CN201

1 on the

indoor electronic
control P.C. board and

L1

(MS-09/10/12/15/17/18SN)/

c (MS-24SN) on the

terminal block with
the tester.

C

MS-09/10/12/15/17/18SN
MS-24SN

(

)

The unit doesn’t operate with the remote controller.

Start

No

Turn ON the power supply.
Press the EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.

Yes

Yes

Outdoor unit does not
operate.

Is the connection of wiring
in outdoor unit correct?

Check the outdoor
fan motor and compressor.
Refer to page 36.

Make the connection of
wiring in outdoor unit
correct.

No

Check the voltage to terminal block of
indoor unit. Is there 220V AC to
terminal block between

2-C?

Reconnect the continuity of indoor and
outdoor unit connection.

Yes

Replace the indoor electronic
control P.C. board.

Compressor
does not operate.

No

Yes

Is the connection of wiring
from terminal block to
compressor correct ?

Check the compressor.
Refer to page 36.

Make the connection of
wiring from terminal block
to compressor correct .

Outdoor fan motor
does not operate.

No

Yes

Is the connection of wiring
from terminal block to
outdoor fan motor correct ?

Check the outdoor fan motor.
Refer to page 36.

Make the connection of
wiring from terminal block
to outdoor fan motor
correct .

No

Does outdoor unit operate?

Yes

Ok

No

Does outdoor unit operate?

Ok

Yes

Does outdoor unit operate?

Ok

Yes

No

No

Check the voltage to terminal block of
outdoor unit. Is there 220V AC to
terminal block between

2-C.

Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.

Check of indoor electronic control P.C. board

C

Compressor and / or outdoor fan does not operate.

D

Check of outdoor unit

<MS-09/10/12/15/17/18SN>

38

<MS-24SN>

Start

Turn ON the power supply.
Press the EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.

Check the voltage to terminal block of
outdoor unit. Is there 220V AC to
terminal block between 2-C?

Check the voltage to terminal block of
outdoor unit. Is there 220V AC to
terminal block between

3-C?

Yes

Outdoor unit does not
operate.

Compressor
does not operate.

Outdoor fan motor
does not operate.

No

Reconnect the continuity of indoor and
outdoor unit connection.

No

Check the voltage to terminal block of
indoor unit. Is there 220V AC to
terminal block between

Replace the indoor electronic
control P.C. board.

Is the connection of wiring
in outdoor unit correct?

No

Make the connection of
wiring in outdoor unit
correct.

Is the connection of wiring
from terminal block to
compressor correct ?

Make the connection of
wiring from terminal block
to compressor correct .

Is the connection of wiring
from terminal block to
outdoor fan motor correct ?

Make the connection of
wiring from terminal block
to outdoor fan motor
correct .

No

No

No

3-C?

Yes

Reconnect the continuity of indoor and
outdoor unit connection.

Replace 52C contactor.

Yes

Does 52C contactor operate?

Does outdoor unit operate?

Yes

Check the compressor.
Refer to page 36.

Does outdoor unit operate?

Yes

Check the outdoor fan motor.
Refer to page 36.

Does outdoor unit operate?

No

No

No

No

Check the outdoor

Yes

fan motor and compressor.
Refer to page 36.

Yes

Ok

Yes

Ok

Yes

Ok

39

TEST POINT DIAGRAM AND VOLTAGE

0

0

10

20

30

40

10 20 30 40 50 60

MS-09SN ­MS-09SN ­MS-10SN ­MS-10SN -

Indoor electronic control P.C. board

C1

C2

C1

C2

Varistor (NR11)

Fuse 250V AC 3.15A

Fan motor power

}

supply

12V DC

5V DC

}

Power
supply
input

}

220V AC

CN201
52C

--

{

+

Room temperature
thermistor
(RT11)

Timer short mode
point(JPS,JPG)
(Refer to page 32.)

Indoor coil
thermistor (RT12)

Emergency
operation switch

+

--

Power monitor, receiver P.C. board

Auto restart function
Cut the Resistor JR07.
(Refer to page 33.)

40

Indoor coil thermistor (RT12)
Room temperature thermistor (RT11)

)

''

Resistance (k

Temperature (;;)

TEST POINT DIAGRAM AND VOLTAGE
MS-12SN - MS-15SN - MS-17SN - MS-24SN ­MS-12SN - MS-15SN - MS-18SN -

C1C2C2

Indoor electronic control P.C. board

}

C1C1C1C1

Fan motor power supply

Varistor (NR11)

Fuse 250V AC 3.15A

CN201

Power supply input
220V AC

}

52C

Auto restart function
Cut the Resistor JR06.
(Refer to page 33.)

Receiver P.C. board

CN304

41

+

C144

--

Room temperature thermistor(RT11)

Indoor coil thermistor(RT12)

JPS

Timer short mode point

JPG

(Refer to page 32.)

Emergency operation switch

JPG

--

JP45

+

}

Indoor coil thermistor (RT12)
Room temperature thermistor (RT11)

5V DC

}

C144

12V DC

40

)

30

''

20

Resistance (k

10

0

0

Temperature (;;)

10 20 30 40 50 60

11

DISASSEMBLY INSTRUCTIONS

<"Terminal with lock mechanism" Detaching points>

In case of terminal with lock mechanism, detach the terminal as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism.
The terminal with no lock mechanism can be removed by pulling it out.
Check the shape of the terminal and work.

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector is a terminal

Sleeve

with lock mechanism.

1Slide the sleeve.
2Pull the terminal while

Locking lever

11-1. MS-09SN - MS-10SN -

MS-09SN - MS-10SN -

pushing the locking
lever.

C1C1
C2C2

INDOOR UNIT

OPERATING PROCEDURE PHOTOS

1. Removing the front panel

(1) Remove the screw caps of the front panel.

Remove the screws.

(2) Pull the panel down to your side slightly and unhook the

catches at the top.

1Hold the sleeve, and
pull out the terminal
slowly.

Connector

Photo 1

Front panel

Screws

2. Removing the electronic control P.C. board and the
power monitor, receiver P.C. board

(1) Remove the front panel. (Refer to 1)
(2) Remove the screw of the electrical cover.

Remove the electrical cover.
(3) Remove the V.A. clamp.
(4) Remove the cord clamp.
(5) Remove the screw of the terminal block.
(6) Remove the screw of the ground wire.
(7) Disconnect all the connectors and all the lead wires on the

electronic control P.C. board.
(8) Remove the R.L holder.
(9) Remove the electronic control P.C. board.
(10)

Open the R.L holder and the power monitor, receiver P.C.

board.

42

Photo 2

Screw of the
V.A. clamp

Screw of the ground wire

Power monitor,
receiver P.C.
board

Fan motor connector

V.A. clamp

Room temperature
thermistor connector

Indoor electronic
control P.C. board

Vane motor
connector

Cord clamp

R.L holder

OPERATING PROCEDURE PHOTOS

3. Removing the electrical box

(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical cover. (Refer to 2)
(3) Disconnect the connector of the indoor coil thermistor.
(4) Disconnect the motor connector (CN211 and CN121) and

the vane motor connector (CN151) on the electronic

control P.C. board.
(5) Remove the screw of ground wire.
(6) Remove the fan motor lead wire and indoor coil thermistor

from the electrical box.
(7) Remove the lead wire of vane motor from the bottom of

electrical box.
(8) Remove the screw fixing the electrical box, remove the

electrical box.

4. Removing the vane motor

(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical box. (Refer to 3)
(3) Pull out the drain hose from the nozzle assembly, remove

the nozzle assembly.

(4) Remove the screws (both upper and lower) of the vane

motor, disconnect the connector.

(5) Remove the vane motor.

Photo 3

Photo 4

Screw of the ground wire

Screw of the
electrical box

Screws of
the vane
motor

Drain hose

5. Removing the line flow fan and the indoor fan motor

(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical box. (Refer to 3)
(3) Pull out the drain hose from the nozzle assembly, remove

the nozzle assembly.

(4) Remove the hexagon socket set screw from the line flow

fan.

(5) Remove the screws fixing the fan motor, remove the fan

motor.

(6) Remove the screws fixing the left side of the heat

exchanger.
(7) Lifting the left side of the heat exchanger.
(8) Remove the line flow fan.

Vane motor

Photo 5

Screws fix­ing the left
side of the
heat
exchanger

Photo 6

Indoor coil
thermistor

Screws of the
fan motor

43

11-2. MS-12SN - MS-15SN - MS-17SN - MS-24SN -

MS-12SN - MS-15SN - MS-18SN -

C1C2C2

INDOOR UNIT

OPERATING PROCEDURE PHOTOS

C1C1C1C1

1. Removing the front panel

(1) Remove the screw caps at the down of the front panel.

Remove the screws.

(2) Pull the panel down to your side slightly and unhook the

catches at the top.

2. Removing the electronic control P.C. board, the
receiver P.C. board and the display P.C. board

(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical cover.
(3) Remove the screw of the terminal cover.
(4) Remove the screw of the terminal block.
(5) Unhook the catch of the lamp holder.
(6) Remove the receiver holder and the receiver P.C. board.
(7) Remove the screw of the ground wire.
(8) Disconnect all the connectors and all the lead wires on the

electronic control P.C. board.

(9) Remove the electronic control P.C. board and display P.C.

board.

Photo 1

Photo 2

Lamp
holder

Front panel

Screws

Screw of the
electrical cover

Display
P.C. board

Receiver
P.C. board

Screw
of the
terminal
block

Indoor
electronic
control
P.C.
board

Screw
of the
electrical
cover

Receiver
holder

44

OPERATING PROCEDURE PHOTOS

3. Removing the electrical box

(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical cover.
(3) Disconnect the connector of the indoor coil thermistor.
(4) Disconnect the motor connector (CN211 and CN121) and

the vane motor connector (CN151) on the electronic con­trol P.C. board.

(5) Remove the screw of the electrical box, remove the electri-

cal box.

4. Removing the vane motor

(1) Remove the front panel. (Refer to 1)
(2) Remove the electrical box. (Refer to 3)
(3) Pull out the drain hose from the nozzle assembly, remove

the nozzle assembly.

(4) Remove the screws (both upper and lower) of the vane

motor, disconnect the connector.

(5) Remove the vane motor.

Photo 3

Screw of the
ground wire

Vane motor

Screw of the
electrical cover

Screws
of the
vane
motor

Screw of the
electrical cover

5. Removing the indoor fan motor and the line flow fan

(1) Remove the front panel.
(2) Remove the electrical box.
(3) Unhook the catches on the both sides of the nozzle

assembly.
(4) Remove the nozzle assembly.
(5) Remove the screws of the bearing support.
(6) Remove the screw of the heat exchanger unhook the catch.
(7) Lifting the heat exchanger, remove the bearing support.
(8) Loose the screw fixing the line flow fan, remove the line

flow fan.
(9) Remove the screws of the motor band, remove the fan

motor.

Photo 4

Heat exchanger

Catch

Screw of the
heat exchanger

Bearing support
screws

Photo 5

Indoor fan motor

Screws
of the
motor
band

45

Line flow fan

Screw of the
motor band

11-3. MU-09SN - MU-10SN - MU-12SN -

MU-09SN - MU-10SN - MU-12SN ­OUTDOOR UNIT

OPERATING PROCEDURE PHOTOS

C1C1C1
C2C2C2

1. Removing the cabinet

(1) Remove the screws of the top panel.
(2) Remove the screw of the service panel.
(3) Remove the screws of the cabinet.
(4) Remove the screws of the front panel and motor support.
(5) Remove the service panel, and remove the screw from

the insides.
(6) Remove the top panel.
(7) Remove the cabinet.

Photo 3

Screws of the
service panel

Screws of the
top panel

Service
panel

Photo 1

Screws
of the
cabinet

Photo 2

Screws of the front panel
and motor support

Screws of the cabinet

Screws of
the top panel

Screws of
the cabinet

2. Removing the electrical parts

(1) Remove the service panel and the cabinet.(Refer to 1)
(2) Remove the following parts.

•Compressor capacitor (C1)

•Outdoor fan capacitor (C2)

•Terminal block

Photo 4

Outdoor fan capacitor

Compressor capacitor

Terminal block

46

OPERATING PROCEDURE PHOTOS

3. Removing the propeller fan and the outdoor fan
motor

(1) Remove the cabinet. (Refer to 1.)
(2) Remove the propeller fan nut.
(3) Remove the propeller fan.

NOTE : Loose the propeller fan in the rotating direction for

removal.

When attaching the propeller fan, align the mark on the
propeller fan and the motor shaft cut section.
Set the propeller fan in position by using the cut on the

shaft and the mark on the propeller fan.
(4) Remove lead clamps and fan motor lead wires.
(5) Remove screws fixing the fan motor.
(6) Remove the fan motor.

Photo 5

Set screws of
outdoor fan motor

Propeller fan

Propeller fan nut

Hook

Outdoor

fan motor

Lead clamps

4. Removing the compressor

(1) Remove the cabinet. (Refer to 1)
(2) Remove the relay panel.
(3) Remove the soundproof felt.
(4) Remove the terminal cover on the compressor.
(5) Disconnect lead wires from the glass terminal of the com-

pressor.
(6) Recover gas from the refrigerant circuit.
(7) Disconnect the welded part of the discharge pipe.
(8) Disconnect the welded part of the suction pipe.
(9) Remove nuts fixing the compressor.

)

(

Remove the compressor.

10

NOTE

● Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm

● Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.

2

(0 MPa).

Photo 6

Glass
terminal

Compressor

Discharge pipe

Compressor
set nuts

Suction pipe

Terminal cover

47

11-4. MU-15SN - MU-17SN - MU-24SN -

MU-15SN - MU-18SN -

C1C2

OUTDOOR UNIT

OPERATING PROCEDURE PHOTOS

C1C1C1

1. Removing the cabinet

(1) Remove the screws of the cabinet.
(2) Hold the down of the cabinet on the both sides to remove

the cabinet.

Photo 2

Screws
of the
cabinet

2. Removing the electrical parts

(1) Remove the cabinet.(Refer to 1)
(2) Remove the following parts.

•Compressor capacitor (C1)

•Outdoor fan capacitor (C2)

•Terminal block

MU-24SN only

•Contactor(52C)

•CR surge absorber (CR)

•Fan motor relay (X1)

•Thermostat (26F1)

Photo 1

Service
panel

Photo 3

Outdoor fan capacitor

Contactor

Screws
of the
cabinet

Terminal
block

48

Compressor
capacitor

CR surge
absorber

Fan motor
relay

OPERATING PROCEDURE

3. Removing the propeller fan and the outdoor fan
motor

(1) Remove the cabinet. (Refer to 1)
(2) Disconnect the connector remove the hooked lead wire

from the fan motor.
(3) Remove the propeller fan nut and remove the propeller fan.
(4) Remove screws fixing the fan motor.

Photo 4

PHOTOS

Hook

Connector

4. Removing the compressor

(1) Remove the cabinet. (Refer to 1)
(2) Remove the soundproof felt.
(3) Remove the terminal cover on the compressor.
(4) Remove the electrical assembly.(Refer to 2)
(5) Recover gas from the refrigerant circuit.
(6) Disconnect the welded part of the discharge pipe.
(7) Disconnect the welded part of the suction pipe.
(8) Remove nuts fixing the compressor.
(9) Remove the compressor.

Propeller fan

Propeller fan nut

Photo 5

Glass
terminal

Suction
pipe

Discharge
pipe

Compressor

Compressor set nuts

49

12

No.

1
2
3

4
5
6
7

8
9

E02 408 970
E02 409 234
E02 411 234
E02 409 976
E02 424 000
E02 409 067
E02 424 010
E02 408 142
E02 408 100
E02 410 100
E02 409 975

INSTALLATION PLATE
BOX (WH)
BOX (WH)
CORNER BOX LEFT (WH)
FRONT PANEL ASSEMBLY (WH)
SCREW CAP (WH)
GRILLE (WH)
CATCH
AIR FILTER
AIR FILTER
CORNER BOX RIGHT (WH)

Symbol

in Wiring

Diagram

Q'ty/unit

1
1

1
1
2
1
3
2

1

Including No.5,6,7
2PCS/SET

3PCS/SET

Remarks

Part No.

Part Name

MS-09
SN­ (WH)

C1

MS-09
SN­ (WH)

C2

MS-10
SN­ (WH)

C1

MS-10
SN­ (WH)

C2

1

1
1
1
2
1
3

2
1

1
1

1
1
2
1
3
2

1

1

1
1
1
2
1
3

2
1

10
11

REMOTE CONTROLLER
REMOTE CONTROLLER HOLDER

E02 468 426
E02 527 083

1
1

1
1

1
1

1
1

PARTS LIST

MS-09SN - (WH)
MS-09SN - (WH)
MS-10SN - (WH)
MS-10SN - (WH)

C1
C2
C1
C2

12-1. INDOOR UNIT STRUCTURAL PARTS

1
2(W)

3

4

5

6

7

8(W)

12-2. ACCESSORY AND

REMOTE CONTROLLER

1110

9

Optional parts
(See page 58.)

12-1. INDOOR UNIT STRUCTURAL PARTS

12-2. ACCESSORY AND REMOTE CONTROLLER

50

W These figures show MS-09SN.

19
20

21

INDOOR HEAT EXCHANGER
INDOOR HEAT EXCHANGER
UNION(LIQUID)
UNION(GAS)

{6.35
{9.52

1

1
1

1
1
1

1

1
1

1
1
1

E02 462 620
E02 515 620
E02 151 667
E02 151 666

MS-09SN - (WH)
MS-09SN - (WH)
MS-10SN - (WH)
MS-10SN - (WH)

C1
C2
C1
C2

12-3. INDOOR UNIT ELECTRICAL PARTS

AND FUNCTIONAL PARTS

1
2

3

SLEEVE
BEARING

17

16

12-4. INDOOR UNIT HEAT EXCHANGER

19(W)

15

4
5

6

ROOM TEMPERATURE
THERMISTOR

13

14

12

7

FUSE

8

VARISTOR

109

11

20

21

12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

Part number that is circled is not shown in the illustration.

Part No.

No.

E02 408 302

1

E02 408 509

2

E02 001 504

3

E02 408 702

4

E02 409 235
E02 715 235

5

E02 716 235
E02 409 040

6

E02 409 041

7

E02 127 382

8

E02 336 385

9

E02 408 034

10

E02 469 452
E02 715 452

11

E02 654 452
E02 716 452
E02 408 303

12

E02 408 308

13

E02 462 300

14

E02 469 375

15

E02 151 505

16

E02 408 307

17

E02 408 381

18

Part Name

LINE FLOW FAN
BEARING MOUNT
SLEEVE BEARING
DRAIN HOSE
NOZZLE (WH)
NOZZLE (WH)
NOZZLE (WH)
VANE UPPER (WH)
VANE LOWER (WH)
FUSE
VARISTOR
VANE CRANK SET
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
VANE MOTOR
ROOM TEMPERATURE THERMISTOR
INDOOR FAN MOTOR
TERMINAL BLOCK
FAN MOTOR RUBBER MOUNT
INDOOR COIL THERMISTOR
THERMAL FUSE

Symbol

in Wiring

Diagram

F11

NR11

MV

RT11

MF

TB

RT12

F12

MS-09
SN-
(WH)

1
1
1
1
1

1
1
1
1
1
1

1
1
1
1
2
1
1

C1

Q'ty/unit

MS-09

C2

SN-
(WH)

1
1
1
1

1

1
1
1
1
1

1

1
1
1
1
2
1
1

MS-10
SN-
(WH)

W This figure shows MS-10SN.

MS-10

C1

SN-
(WH)

1
1
1
1
1

1
1
1
1
1

1

1
1
1
1
2
1
1

1
1
1
1

1
1
1
1
1
1

1
1
1
1
1
2
1
1

Remarks

C2

Including fan guard
Including fan guard

3.15A

AUTO RESTART
AUTO RESTART
AUTO RESTART
AUTO RESTART

RC4N19-

2PCS/SET

93:

12-4. INDOOR UNIT HEAT EXCHANGER

51

No.

Part No.

Part name

Remarks

Symbol

in Wiring

Diagram

Q'ty/unit

1
2
3
4
5
6

7

8

9
10
11
12
13
14
15
16
17

18

E02 336 297
E02 336 515
E02 336 630
E02 336 232
E02 336 521
E02 336 501
E02 462 301
E02 463 301
E02 462 900
E02 654 900
E02 336 506
E02 339 290
E02 339 661
E02 339 662
E02 336 245
E02 339 233
E02 469 374
E02 085 353
E02 095 350
E02 339 936
E02 289 936

TOP PANEL
MOTOR SUPPORT
OUTDOOR HEAT EXCHANGER
CABINET
GRILLE
PROPELLER FAN
OUTDOOR FAN MOTOR
OUTDOOR FAN MOTOR
COMPRESSOR
COMPRESSOR
COMPRESSOR RUBBER SET
BASE
STOP VALVE(GAS)
STOP VALVE(LIQUID)
SERVICE PANEL
BACK PANEL
TERMINAL BLOCK
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
CAPILLARY TUBE
CAPILLARY TUBE

RA6N23­RA6N33­RH-130NGDT
RH-145NGDT
3RUBBERS/SET

{9.52
{6.35

3P
25+ /440VAC

1.5+ /440VAC

{3.0x{1.4x600
{3.0x{1.6x900

1
1
1
1
1
1
1

1

3
1
1
1
1
1
1
1
1
1

MF

MF
MC
MC

TB

C1

C2

MU-09
SN-

MU-09
SN-

MU-10
SN-

MU-10
SN-

1
1
1
1
1
1

1

1
3
1
1
1
1
1
1
1
1

1

1
1
1
1
1
1
1

1

3
1
1
1
1
1
1
1
1
1

1
1
1
1
1
1

1

1
3
1
1
1
1
1
1
1
1

1

C1 C2 C1 C2

MU-09SN ­MU-09SN ­MU-10SN ­MU-10SN -

C1
C2
C1
C2

12-5. OUTDOOR UNIT

STRUCTURAL PARTS,
ELECTRICAL PARTS AND
FUNCTIONAL PARTS

1
2

3

4

5

17

16

15

14

13

6

Part number that is circled is not shown in the illustration.

7

8

52

9

10

11

12

8
9

REMOTE CONTROLLER
REMOTE CONTROLLER HOLDER

1
1

1
1

1
1

1
1

E02 468 426
E02 527 083

1
1

1
1

1
1

MS-12SN - (WH)
MS-12SN - (WH)
MS-15SN - (WH)
MS-15SN - (WH)

C1
C2
C1
C2

MS-17SN - (WH)
MS-18SN - (WH)
MS-24SN - (WH)

C1
C1
C1

12-6. INDOOR UNIT STRUCTURAL PARTS

1

2

3

12-7. ACCESSORY AND

REMOTE CONTROLLER

98

4

5

6

Optional parts
(See page 58.)

12-6. INDOOR UNIT STRUCTURAL PARTS

Part number that is circled is not shown in the illustration.

Symbol

No.

Part No. Part Name Remarks

E02 141 970

1

E02 143 234

2

E02 138 000

3

E02 138 010

4

E02 143 067

5

E02 141 100

6

E02 470 007

7

INSTALLATION PLATE
BOX(WH)
FRONT PANEL ASSEMBLY(WH)
GRILLE(WH)
SCREW CAP(WH)
AIR FILTER
LAMP PANEL

in Wiring

Diagram

MS-12

MS-12

C1 C2 C1

SN-

(WH)

1
1
1
1
3
2
1

MS-15

SN-

(WH)

1
1
1
1
3
2
1

Q'ty / unit

MS-15

SN-

SN-

(WH)

(WH)

1
1
1
1
3
2
1

MS-17

C2

SN-

(WH)

1

1

1

1

1

1

1

1

3

3

2

2

1

1

MS-18

MS-24

C1 C1 C1

SN-

(WH)

1
1
1
1
3
2
1

SN-

(WH)

1
1

Including No.4,5

1
1

3PCS/SET

3
2
1

12-7. ACCESSORY AND REMOTE CONTROLLER

53

MS-12SN - (WH)

No.

Part No. Part Name Remarks

Symbol

in Wiring

Diagram

Q'ty / unit

1
2
3
4

5
6

7
8

9

10
11

12

13
14
15
16
17

18

19

LINE FLOW FAN
BEARING MOUNT
SLEEVE BEARING
DRAIN HOSE
NOZZLE(WH)
NOZZLE(WH)
VANE(WH)
INDOOR COIL THERMISTOR
VANE MOTOR
VANE MOTOR
TERMINAL BLOCK
TERMINAL BLOCK
ROOM TEMPERATURE THERMISTOR
RECEIVER P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
FAN MOTOR RUBBER MOUNT
INDOOR FAN MOTOR
DISPLAY P.C. BOARD
VARISTOR
FUSE
THERMAL FUSE
THERMAL FUSE
SURGE ABSORBER
SURGE ABSORBER

RT12

MV

MV

TB
TB

RT11

MF

NR11

F11
F12
F12

DSAR
DSAR

1
1
1
1
1

1
1
1

1

1
1
1

2
1
1
1
1
1

1

1
1
1
1
1

1
1
1

1

1
1
1

2
1
1
1
1
1

1

1
1
1
1
1

1
1
1

1

1
1

1

2
1
1
1
1
1

1

1
1
1
1
1

1
1
1

1
1
1

1

2
1
1
1
1

1

1

Including fan guard

AUTO RESTART
AUTO RESTART
AUTO RESTART
AUTO RESTART
2PCS/SET
RA4N30 -

3.15A
93:
93:

(WH)

MS-12
SN-

C1

(WH)

MS-12
SN-

C2

(WH)

MS-15
SN-

C1

(WH)

MS-15
SN-

C2

(WH)

MS-17
SN-

C1

(WH)

MS-18
SN-

C1

(WH)

MS-24
SN-

C1

E02 141 302
E02 141 509
E02 001 504
E02 408 702
E02 143 235
E02 717 235
E02 143 040
E02 138 307
E02 141 303
E02 408 303
E02 470 375
E02 473 375
E02 138 308
E02 141 468
E02 470 452
E02 717 452
E02 472 452
E02 719 452
E02 001 505
E02 172 300
E02 138 329
E02 336 385
E02 127 382
E02 205 381
E02 209 381
E02 138 383
E02 147 383

1
1
1
1

1
1
1

1
1

1
1

1

2
1
1
1
1
1

1

1
1
1
1

1
1
1

1
1

1
1

1

2
1
1
1
1
1

1

1
1
1
1

1
1
1

1
1

1
1

1
2
1
1
1
1
1

1

MS-12SN - (WH)
MS-15SN - (WH)
MS-15SN - (WH)

C1
C2
C1
C2

MS-17SN - (WH)
MS-18SN - (WH)
MS-24SN - (WH)

C1
C1
C1

12-8. INDOOR UNIT ELECTRICAL PARTS

AND FUNCTIONAL PARTS

1
2

SLEEVE
BEARING

3

4

5
6

15

13

14

12-9. INDOOR UNIT HEAT EXCHANGER

12

11

20

INDOOR COIL

THERMISTOR

7

8

12-8. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

Part numbers that are circled are not shown in the illustration.

12-9. INDOOR UNIT HEAT EXCHANGER

20
21

22

E02 141 620
E02 138 667
E02 176 667
E02 179 667
E02 138 666

INDOOR HEAT EXCHANGER
UNION (LIQUID)
UNION (LIQUID)
UNION (GAS)
UNION (GAS)

9

ROOM TEMPERATURE

10

THERMISTOR

54

21

1
1

1

1
1

1

22

1
1

1

1
1

1

1

1
1

1

1

1

1

1

1

{6.35
{9.52
{12.7
{15.88

MU-12SN ­MU-12SN -

C1
C2

12-10. OUTDOOR UNIT

STRUCTURAL PARTS,
ELECTRICAL PARTS AND
FUNCTIONAL PARTS

1

2
3

4

5

17

16

15

14

13

6

Part number that is circled is not shown in the illustration.

No.

E02 336 297

1

E02 442 515

2

E02 498 630

3

E02 336 232

4

E02 336 521

5

E02 336 501

6

E02 463 301

7

E02 270 900

8

E02 075 506

9

E02 340 290

10

E02 340 661

11

E02 339 662

12

E02 336 245

13

E02 339 233

14

E02 469 374

15

E02 270 353

16

E02 095 350

17

E02 285 936

18

Part No.

TOP PANEL
MOTOR SUPPORT
OUTDOOR HEAT EXCHANGER
CABINET
GRILLE
PROPELLER FAN
OUTDOOR FAN MOTOR
COMPRESSOR
COMPRESSOR RUBBER SET
BASE
STOP VALVE(GAS)
STOP VALVE(LIQUID)
SERVICE PANEL
BACK PANEL
TERMINAL BLOCK
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
CAPILLARY TUBE

Part name

7

8

Symbol

in Wiring

Diagram

MF

MC

TB
C1
C2

55

MU-12SN- MU-12SN-

10 119

Q'ty/unit

C1 C2

1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1

12

Remarks

1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1

RA6N33­RH-167NHDT
3RUBBERS/SET

{12.7
{6.35

3P
25+ /370VAC

1.5+ /440VAC
{3.0x{1.8x500

MU-15SN ­MU-15SN ­MU-17SN ­MU-18SN ­MU-24SN -

C1
C2
C1
C1
C1

12-11. OUTDOOR UNIT

STRUCTURAL PARTS,
ELECTRICAL PARTS AND
FUNCTIONAL PARTS

16

15

14

1

2
3

13

4

5

9

6 11

56

8

7

10

12

No.

Part No. Part Name Remarks

Symbol

in Wiring

Diagram

Q'ty / unit

1

2

3

4
5
6

7

8

9

10

11

12

13

14

15

16

17

18
19

20

21

BACK PANEL
MOTOR SUPPORT
MOTOR SUPPORT
MOTOR SUPPORT
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
CABINET
GRILLE
PROPELLER FAN
OUTDOOR FAN MOTOR
OUTDOOR FAN MOTOR
COMPRESSOR RUBBER SET
COMPRESSOR RUBBER SET
COMPRESSOR
COMPRESSOR
COMPRESSOR
COMPRESSOR
BASE
BASE
BASE
STOP VALVE(GAS)
STOP VALVE(LIQUID)
STOP VALVE(LIQUID)
SERVICE PANEL
TERMINAL BLOCK
TERMINAL BLOCK
OUTDOOR FAN CAPACITOR
COMPRESSOR CAPACITOR
COMPRESSOR CAPACITOR
COMPRESSOR CAPACITOR
COMPRESSOR CAPACITOR
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
CONTACTOR
FAN MOTR RELAY
THERMOSTAT
CR SURGE ABSORBER

MF
MF

MC
MC
MC
MC

TB

TB

C2

C1

C1

C1

C1

52C

X1

26F1

CR

1
1

1

1
1
1
1

3

1

1

1
1

1
1

1
1

1

1

1

1

1
1
1
1

3

1

1

1
1

1
1

1

1

1

1

1

1

1
1
1

1

4

1

1
1

1
1

1
1

1

1
1
1
1
1
1
1

RA6N50 ­RA6V60 ­3RUBBERS/SET
4RUBBERS/SET
RH-207NHDT
RH-231NHDT
RH-277NHDT
NH-38NBDT

{15.88
{6.35
{9.52

3P
3P

3.0+ /440VAC
30+ /370VAC
35+ /370VAC
40+ /440VAC
50+ /440VAC

{3.0✕{1.8✕550
{3.0✕{2.0✕700
{3.0✕{2.0✕500
{3.0✕{2.0✕100
{3.0✕{1.6✕350
{3.0✕{2.0✕600

E02 140 233
E02 138 515
E02 139 515
E02 496 515
E02 138 630
E02 147 630
E02 561 630
E02 141 232
E02 141 521
E02 141 501
E02 270 301
E02 147 301
E02 075 506
E02 138 506
E02 271 900
E02 272 900
E02 719 900
E02 177 900
E02 270 290
E02 156 290
E02 176 290
E02 150 661
E02 139 662
E02 176 662
E02 141 245
E02 469 374
E02 473 374
E02 138 351
E02 271 353
E02 272 353
E07 058 353
E02 082 353
E02 271 936
E02 138 936
E02 064 936
E02 147 937
E02 176 936
E02 238 936
E02 177 342
E02 288 343
E02 253 381
E02 364 384

MU-15
SN-

C1

MU-15
SN-

C2

MU-17
SN-

C1

MU-18
SN-

C1

MU-24
SN-

C1

1
1

1

1
1
1
1

3

1

1

1
1

1
1

1
1

1

1

1

1
1
1
1
1

3

1

1

1
1

1
1

1

1

1

12-11. OUTDOOR UNIT

STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

Part numbers that are circled are not shown in the illustration.

57

13

Model

Part No.

MAC-1300FT

C1
C2

C1
C1
C1

C2

C1
C2

C1
C2

MAC-1100FT

MS-10SN­MS-10SN-

MS-17SN­MS-18SN­MS-24SN-

MS-09SN­MS-09SN-

MS-12SN­MS-12SN­MS-15SN­MS-15SN-

C1

MAC-1800DF

MAC-1600DF

Model

Part No.

MS-09SN­MS-09SN-

MS-12SN­MS-12SN­MS-15SN­MS-15SN-

C1
C2

C1
C2
C1
C2

C1

C2

MS-10SN­MS-10SN-

MS-17SN­MS-18SN­MS-24SN-

C1

C1

C1

Model Part No. Pipe length

Pipe size O.D mm (in.)

Cross-section

A - Gas B - Liquid

Insulation

Additional

refrigerant

charge

R-22(g)

CD

C1

MS-09SN -

MS-12SN -

9.52 (3/8)

12.7 (1/2)

2127

2731

6.35 (1/4)

6.35 (1/4)

MAC-440PI
MAC-441PI
MAC-442PI
MAC-443PI
MAC-660PI
MAC-661PI
MAC-662PI
MAC-663PI
MAC-664PI
MAC-670PI
MAC-671PI
MAC-672PI
MAC-673PI

MAC-674PI
MAC-860PIE
MAC-861PIE
MAC-862PIE
MAC-863PIE
MAC-864PIE

3m
5m
7m

10m

3m
5m

7m
10m
15m

3m

5m

7m
10m
15m

3m

5m

7m
10m
15m

0

45

0

45

120

0

45

120

0

45

120

15.88 (5/8)

15.88 (5/8)

27

27

31

31

6.35 (1/4)

9.52 (3/8)

MS-15SN -

MU-15SN -

MS-17SN -

MU-17SN -

MS-18SN -

MU-18SN -

MU-09SN -

MU-12SN -

MS-24SN ­MU-24SN -

MS-10SN ­MU-10SN -

C1
C1

C1

C1
C1

C1

C1
C1
C1

C1

C1

C2
C2

C2

C2

C2
C2

C2
C2

C1

C1

OPTIONAL PARTS

13-1. REFRIGERANT PIPES

The air conditioner has flared connections its indoor and outdoor sides.
Please use the optional extension pipe as follows.

13-2. AIR CLEANING FILTER

● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.

● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible.

● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.

● DO NOT reuse AIR CLEANING FILTER even if it is washed.

● DO NOT remove or attach AIR CLEANING FILTER during unit operation.

13-3. DEODORIZING FILTER

● DEODORIZING FILTER removes ammonia and hydrogen sulphide emitted from tobacco, and odor of pets.

● Clean DEODORIZING FILTER every two weeks. If the filter is particularly dirty, clean the filter more often.

● For cleaning, soak the filter in warm water for a while, and then wash and rinse it. Dry the filter in the shade

thoroughly.

● When the filter color is still dark even after cleaning, replace the filter with a new one.
Replace the filter at least once a year.

● DEODORIZING FILTER and AIR CLEANING FILTER can be attached on either side.

58

HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN

CC

Copyright 2000 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Feb. 2002. No.OB256 REVISED EDITION-B 122
Reprinted in May 2001. No.OB256 REVISED EDITION-A 50
Distributed in May 2001. No.OB256 REVISED EDITION-A 123
Distributed in Jul. 2000. No.OB256 173
Made in Japan

New publication, effective Feb. 2002
Specifications subject to change without notice.