Mitsubishi Electronics Msh 24nv User Manual

This Servise Manual OB207 deals with MSH-07/09/12/18/24NV-E1,

MUH-07/09/12/18/24NV-E1, MSH-18NV-E2, and MUH-18NV-E2 in

OB176 REVISED EDITION-A issued in July in1997.

Therefore, please refer to OB207, not to OB176 REVISED

EDITION-A, for the above models.

SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

No. OB207

SERVICE MANUAL

Wireless type

Models

MSH-07NV - · MUH-07NV -

(

)

MSH-09NV - · MUH-09NV -

(

)

MSH-12NV - · MUH-12NV -

(

)

MSH-18NV - · MUH-18NV -

(

)

MSH-24NV - · MUH-24NV -

(

)

MSH-07NV - · MUH-07NV -

(

)

MSH-09NV - · MUH-09NV -

(

)

MSH-12NV - · MUH-12NV -

(

)

MSH-18NV - · MUH-18NV -

(

)

MSH-24NV - · MUH-24NV -

(

)

MSH-18NV - · MUH-18NV -

(

)

CONTENTS

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

2. PART NAMES AND FUNCTIONS······················3

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

4. OUTLINES AND DIMENSIONS ······················ 11

5. WIRING DIAGRAM ··········································15

6. REFRIGERANT SYSTEM DIAGRAM··············24

7. PERFORMANCE CURVES······························29

8. MICROPROCESSOR CONTROL ····················33

9. SERVICE FUNCTIONS ····································44

10. TROUBLESHOOTING······································47

11. DISASSEMBLY INSTRUCTIONS·····················60

12. PARTS LIST······················································70

13. OPTIONAL PARTS ····································BACK

MSH-18NV -

Refer to the Service Manual OB185 when MSH-07/09/12NV- , MSH-07/09/12/18NV- , and MSH-18NV-

are connected with MXZ-32NV-

as multi system units.

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSH-07NV -

MSH-09NV -

MSH-12NV -

MSH-07NV -

MSH-09NV -

MSH-12NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

(When the front panel is open)

MSH-07NV -

MSH-09NV -

MSH-12NV -

MSH-07NV -

MSH-09NV -

MSH-12NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

OUTDOOR UNIT

MUH-07NV -

MUH-09NV -

MUH-07NV -

MUH-09NV -

MUH-12NV -

MUH-18NV -

MUH-24NV -

MSH-07NV -

MSH-09NV -

MSH-12NV -

MSH-18NV -

REMOTE CONTROLLER

MSH-07NV - (Serial number 7000201T~) MSH-09NV - (Serial number 7000201T~)

MSH-12NV - (Serial number 7000001T~) MSH-24NV -

MSH-07NV -

MSH-12NV -

MSH-24NV -

MSH-09NV -

MSH-18NV - (Serial number 7000001T~)

MSH-18NV -

SPECIFICATION

Model

Function

MSH-07NV -

Cooling

MSH-09NV -

Cooling

Heating

Power supply

Capacity

Single phase,220-240V,50HzSingle phase,220-240V,50Hz

2.2

0.8

2.5

—

2.5

1.1

3.1

—

Capacity

R/h

Dehumidification

Air flow

K /h INDOOR 492 OUTDOOR 1620 INDOOR 492 OUTDOOR 1620

Power outlet

3.30-3.20

710-750

—

3.15-3.05

680-720

—

4.10-4.00

880-920

—

4.30-4.10

920-940

—

Running current

Power input

A(kW)

Auxiliary heater

Power factor

98-96

97-96

Electrical data

98-98

Starting current

Compressor motor current

Fan motor current

2.80-2.70

2.65-2.55

3.60-3.50

3.80-3.60

INDOOR 0.17 OUTDOOR 0.33 INDOOR 0.17 OUTDOOR 0.33

3.10-2.93 3.68-3.47

2.84-2.72 3.37-3.30

RH-135VGHT RH-174VGHT

Coefficient of performance(C.O.P)

Model

Compressor

Output

650

800

C-R4.17 C-S5.75

RC4V19-AA

C-R3.26 C-S5.82

RC4V19-AA

Winding resistance(at20:)

Indoor

Model

fan motor

Outdoor

fan motor

WHT-BLK292 BLK-RED324 WHT-BLK292 BLK-RED324

RA6V29-CB RA6V29-CB

WHT-BLK218.0 BLK-RED423.7 WHT-BLK218.0 BLK-RED423.7

Winding resistance(at20:)

Model

Winding resistance(at20:)

Width

815

275

183

780

540

255

815

275

183

780

540

255

Indoor unit

Height

Depth

Width

Height

Depth

Dimensions

Weight

Outdoor unit

Indoor unit

Outdoor unit

Air direction

Sound level

(Hi)

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

rpm

1,100

790-820

1,100

790-820

Fan speed

(Hi)

Special remarks

Fan speed

regulator

0.85

Refrigerant filling capacity(R-22)

RT11(at25:)

Thermistor

RT12(at25:)

33.18

RT61(at0:)

NOTE:Test conditions

Cooling : Indoor DB27°C / WB19°C

Outdoor DB35°C / WB24°C

Heating : Indoor DB20°C /WB15.5°C

Outdoor DB 7°C / WB 6°C

Model

Function

MSH-12NV -

Cooling

MSH-18NV -

Cooling

Heating

Power supply

Single phase,220-240V,50HzSingle phase,220-240V,50Hz

3.4

1.6

4.0

—

5.1

2.5

5.4

—

Capacity

R/h

Dehumidification

Air flow

K /h INDOOR 558 OUTDOOR 2130-2244 INDOOR 756 OUTDOOR 2142

Power outlet

5.75-5.90

1220-1300

—

5.95-6.10

1260-1350

—

9.4-9.2

2030-2120

—

9.2-9.0

1980-2070

—

Running current

Power input

A(kW)

Auxiliary heater

Power factor

96-92

98-96

Electrical data

52-58

8.76-8.56 8.56-8.36

Starting current

Compressor motor current

Fan motor current

5.21-5.36

5.41-5.56

INDOOR 0.17 OUTDOOR 0.37 INDOOR 0.25 OUTDOOR 0.39

2.78-2.61 3.17-2.96

2.51-2.41 2.73-2.61

RH-231VHAT NH-36VMDT

Coefficient of performance(C.O.P)

Model

Compressor

Output

1100

1700

C-R2.1 C-S3.9

RC4V19-AA

C-R1.2 C-S2.7

RA4V27-EA

Winding resistance(at20:)

Indoor

Model

fan motor

Outdoor

fan motor

WHT-BLK292 BLK-RED324 WHT-BLK183.8 BLK-RED250.5

RA6V40-EC or EE RA6V50-OD or OF

WHT-BLK130 BLK-RED134.6 WHT-BLK116.4 BLK-RED111.0

Winding resistance(at20:)

Model

Winding resistance(at20:)

Width

815

275

183

850

605

290

1015

320

190

850

605

290

Indoor unit

Height

Depth

Width

Height

Depth

Dimensions

Weight

Outdoor unit

Indoor unit

Outdoor unit

Air direction

Sound level

(Hi)

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

rpm

1230

780-820

1180

810-845

Fan speed

(Hi)

Special remarks

Fan speed

regulator

1.15

1.8

Refrigerant filling capacity(R-22)

RT11(at25:)

Thermistor

RT12(at25:)

33.18

RT61(at0:)

NOTE:Test conditions

Cooling : Indoor DB27°C / WB19°C

Outdoor DB35°C / WB24°C

Heating : Indoor DB20°C /WB15°.5C

Outdoor DB 7°C / WB 6°C

Model

Function

MSH-24NV -

Cooling

Heating

Power supply

Single phase,220-240V,50Hz

R/h

K /h

6.0

3.1

6.2

—

Capacity

Dehumidification

Air flow

816

Power outlet

12.6-11.7

11.5-11.0

Running current

Power input

2720-2750 2470-2580

A(kW)

—

Auxiliary heater

Power factor

Electrical data

Starting current

Compressor motor current

Fan motor current

11.73-10.83 10.63-10.13

INDOOR 0.29 OUTDOOR 0.58

2.21-2.18

2.51-2.40

Coefficient of performance(C.O.P)

Model

NH-47VMDT

Compressor

Output

2200

C-R 0.96 C-S 2.07

Winding resistance(at20:)

Indoor

RA4V27-EC

Model

fan motor

Outdoor

fan motor

WHT-BLK183.8 BLK-RED250.5

Winding resistance(at20:)

Model

RA6V85-AA

WHT-BLK62.7 BLK-YLW30.2 YLW-RED62.9

Winding resistance(at20:)

Width

1015

320

190

870

850

295

Indoor unit

Height

Depth

Width

Height

Depth

Dimensions

Weight

Outdoor unit

Indoor unit

Outdoor unit

Air direction

Sound level

(Hi)

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

rpm

1,260

720-750

Fan speed

(Hi)

Special remarks

Fan speed

regulator

2.4

Refrigerant filling capacity(R-22)

RT11(at25:)

Thermistor

RT12(at25:)

33.18

RT61(at0:)

NOTE:Test conditions

Cooling : Indoor DB27°C / WB19°C

Outdoor DB35°C / WB24°C

Heating : Indoor DB20°C /WB15.5°C

Outdoor DB 7°C / WB 6°C

Refer to the Service Manual OB185 when MSH-07/09/12NV- , MSH-07/09/12/18NV- , and MSH-18NV-

are

connected with MXZ-32NV-

as multi system units.

Model

E1 E2

(INDOOR UNIT) MSH-09NV- (INDOOR UNIT)

MSH-07NV-

Function

Cooling

Heating

Cooling

Heating

Power supply

Single phase,220-240V,50Hz Single phase,220-240V,50Hz

R/h

K /h

—

Capacity

Dehumidification

Air flow

492

Power outlet

0.17

Running current

Power input

A(kW)

—

Auxiliary heater

Power factor

Electrical data

94-86

—

Starting current

Compressor motor current

Fan motor current

—

0.17

—

Coefficient of performance(C.O.P)

Model

—

Compressor

Output

—

Winding resistance(at20:)

Indoor

RC4V19-AA

Model

fan motor

Outdoor

fan motor

WHT-BLK292 BLK-RED324 WHT-BLK292 BLK-RED324

Winding resistance(at20:)

Model

—

Winding resistance(at20:)

Width

815

275

183

—

815

275

183

—

Indoor unit

Height

Depth

Width

Height

Depth

Dimensions

Weight

—

Outdoor unit

—

Indoor unit

Outdoor unit

Air direction

Sound level

(Hi)

—

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

rpm

1,100

—

1,100

—

Fan speed

(Hi)

Special remarks

Fan speed

regulator

—

Refrigerant filling capacity(R-22)

—

RT11(at25:)

Thermistor

RT12(at25:)

RT61(at0:)

Please refer to Service manual OB185 for capacity.

NOTE:Test conditions

Cooling : Indoor DB27°C / WB19°C

Outdoor DB35°C / WB24°C

Heating : Indoor DB20°C /WB15.5°C

Outdoor DB 7°C / WB 6°C

Refer to the Service Manual OB185 when MSH-07/09/12NV- , MSH-07/09/12/18NV- , and MSH-18NV-

are

connected with MXZ-32NV-

as multi system units.

E1 E2

E2 E3

Model

MSH-12NV-

(INDOOR UNIT)MSH-18NV-

(INDOOR UNIT)

Heating

Function

Cooling

Heating

Cooling

Power supply

Single phase,220-240V,50Hz Single phase,220-240V,50Hz

R/h

K /h

—

Capacity

—

Dehumidification

Air flow

558

756

Power outlet

0.17

0.28

Running current

Power input

A(kW)

—

Auxiliary heater

Power factor

Electrical data

94-86

97-89

—

Starting current

Compressor motor current

Fan motor current

—

0.17

0.25

—

Coefficient of performance(C.O.P)

Model

—

Compressor

Output

—

Winding resistance(at20:)

Indoor

RA4V19-AA

RA4V27-EA

Model

fan motor

Outdoor

fan motor

WHT-BLK292 BLK-RED324 WHT-BLK184 BLK-RED251

Winding resistance(at20:)

Model

—

Winding resistance(at20:)

Width

815

275

183

—

1015

320

190

—

Indoor unit

Height

Depth

Width

Height

Depth

Dimensions

Weight

—

Outdoor unit

—

Indoor unit

Outdoor unit

Air direction

Sound level

(Hi)

—

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

rpm

1,230

—

1,180

—

Fan speed

(Hi)

Special remarks

Fan speed

regulator

—

Refrigerant filling capacity(R-22)

—

RT11(at25:)

Thermistor

RT12(at25:)

RT61(at0:)

Please refer to Service manual OB185 for capacity.

NOTE:Test conditions

Cooling : Indoor DB27°C / WB19°C

Outdoor DB35°C / WB24°C

Heating : Indoor DB20°C /WB15.5°C

Outdoor DB 7°C / WB 6°C

OUTLINES AND DIMENSIONS

Unit: mm

MSH-07NV -

MSH-09NV -

MSH-07NV -

MSH-09NV -

INDOOR UNIT

MUH-07NV -

MUH-09NV -

MUH-07NV -

MUH-09NV -

OUTDOOR UNIT

Unit: mm

MSH-12NV -

INDOOR UNIT

9.52

MUH-12NV -

OUTDOOR UNIT

If the right/left sides or

back side is vacant,the

front has only to be 50cm

unobstructed.

Unit: mm

MSH-18NV -

MSH-24NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

INDOOR UNIT

Indoor unit

217

4holes 11✕20

150

648

995

450

438

352

Wall hole [75

Installation plate

190

1015

Installation plate

Liquid line [8-0.5m

Gas linee [12-0.43m

Insulatiion [50 O.D

[28 I.D

Air in

{

Drain hose [16

Insulattion [28

775

190

Air out

Power suppply cord

Lead too right 2m

Lead too left 1m

17.5

MUH-18NV -

OUTDOOR UNIT

If the right/left sides or

back side is vacant,the

front has only to be 50cm

unobstructed.

MUH-24NV-

Unit : mm (inch)

4 5

5 3

1 5 0

2 0 0

2 5 m a x .

8 0

5 0 0

1 7

8 5 0 ( 3 3 - 7 / 1 6 )

5 5 3

4 5

4 2

3 6 2 ( 1 4 - 1 / 4 )

3 3 0 ( 1 3 ) 1 5

2 7 . 5 3 9 . 5

3 5 2

3 3 7

1 7

4 0 3

5 2 4

1 7 9

4 4 1

3 3

2 3

2 0 0

1 3 8

WIRING DIAGRAM

MODELS WIRING DIAGRAM

MSH-07NV -

MSH-09NV -

INDOOR UNIT

❈

~/N

FOR MULTI SYSTEM

12VDC

TO OUTDOOR

UNIT

CONNECTING

;

SYMBOL

C11

NAME

SYMBOL

NR11

RT11

NAME

SYMBOL

NAME

TERMINAL BLOCK

VANE MOTOR

INDOOR FAN CAPACITOR

FUSE(93:)

VARISTOR

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

CONTACTOR

F12

FUSE(3.15A)

SOLID STATE RELAY

F11

RT12

SR11

INDOOR FAN MOTOR

52C

NOTE:1. For the outdoor 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

MUH-07NV -

MUH-09NV -

MODELS WIRING DIAGRAM

OUTDOOR UNIT

❈

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

X62

NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN MOTOR CAPACITOR

CONTACTOR

OUTDOOR FAN MOTOR

VARISTOR

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

DC/DC CONVERTER

C65

52C

F61

NR61

RT61

SR61

21S4

DEFROST THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

IC881

FUSE(2A)

COMPRESSOR(INNER THERMOSTAT)

NOTE:1. Use copper conductors only.(For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers.

3. Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

4. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

MODEL WIRING DIAGRAM

MSH-12NV -

INDOOR UNIT

❈

~/N

FOR MULTI SYSTEM

12VDC

TO OUTDOOR

UNIT

CONNECTING

;

SYMBOL

C11

NAME

SYMBOL

NR11

RT11

NAME

SYMBOL

NAME

TERMINAL BLOCK

VANE MOTOR

INDOOR FAN CAPACITOR

FUSE(93:)

VARISTOR

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

CONTACTOR

F12

FUSE(3.15A)

SOLID STATE RELAY

F11

RT12

SR11

INDOOR FAN MOTOR

52C

NOTE:1. For the outdoor 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

MODEL WIRING DIAGRAM

MUH-12NV -

OUTDOOR UNIT

❈

SYMBOL

NAME

COMPRESSOR CAPACITOR

SYMBOL

NAME

SYMBOL

X62

NAME

OUTDOOR FAN MOTOR

VARISTOR

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

DC/DC CONVERTER

C65

52C

F61

OUTDOOR FAN MOTOR CAPACITOR

CONTACTOR

NR61

RT61

SR61

21S4

DEFROST THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

IC881

FUSE(2A)

COMPRESSOR(INNER THERMOSTAT)

NOTE:1. Use copper conductors only.(For field wiring)

2. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

3. Symbols below indicate.

: Terminal block,

: Connector

MSH-18NV -

MODEL WIRING DIAGRAM

INDOOR UNIT

❈

SYMBOL

NAME

SYMBOL

NR11

RT11

NAME

SYMBOL

NAME

INDOOR FAN CAPACITOR

FUSE(93:)

VARISTOR

TERMINAL BLOCK

SURGE ABSORBER

DC/DC CONVERTER

C11

F12

F11

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

HYBRID IC

DSAR

HIC1

FUSE(3.15A)

RT12

IC141

52C

INDOOR FAN MOTOR

VANE MOTOR

CONTACTOR

NOTE:1. For the outdoor 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

MUH-18NV -

MODEL WIRING DIAGRAM

OUTDOOR UNIT

❈

SYMBOL

NAME

COMPRESSOR CAPACITOR

SYMBOL

NAME

SYMBOL

X62

NAME

OUTDOOR FAN MOTOR

VARISTOR

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

CONTACTOR

C65

DSAR

F61

OUTDOOR FAN MOTOR CAPACITOR

SURGE ABSORBER

FUSE(2A)

NR61

RT61

SR61

21S4

52C

DEFROST THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

COMPRESSOR<INNER THERMOSTAT>

NOTE:1. Use copper conductors only.(For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers.

3. Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

4. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

MSH-24NV -

MODEL WIRING DIAGRAM

220-240V~

INDOOR UNIT

RED

❈

RT12

RT11

112

F12

220-240V~

HIC1

WHT

IC141

111

_BLU2

TO OUTDOOR

UNIT

BLU

BRN

121

CN201

52C

YLW

GRY

WHT

RED

BLK

❈

CONNECTING

❈

BLU

TRANS

CN211

BLU

WHT

F11

POWER

SUPPLY

CORD

151

101

102

ELECTRONIC CONTROL P.C BOARD

~/N 220-240V

50Hz

DISPLAY

RECEIVER

P.C.BOARD

CIRCUIT BREAKER

GRN/YLW

P.C.BOARD

REMOTE

CONTROLLER

SYMBOL

C11

NAME

SYMBOL

NR11

RT11

NAME

SYMBOL

NAME

TERMINAL BLOCK

DC/DC CONVERTER

NOISE FILTER

INDOOR FAN MOTOR CAPACITOR

FUSE(93:)

VARISTOR

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

HYBRID IC

F12

HIC1

FUSE(3.15A)

F11

RT12

IC141

52C

INDOOR FAN MOTOR

VANE MOTOR

CONTACTOR

NOTE:1. For the outdoor 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

MUH-24NV -

MODEL WIRING DIAGRAM

RT61

OUTDOOR UNIT

21S4

_YLW1

YLW

BLK

WHT

ORN

BRN

BLK

WHT

ORN

RED RED

CN661

CN721

CN711

CN730

X62

12VDC ❈

RED

IC881

WHT

❈

_220-240V~2 _WHT

ORN

RED

TB2

BLU

RED

BLU

❈

TRANS

26F1

TAB20

❈

YLW

52C

DEICER

P.C. BOARD

52C1

❈

4 ❈

VLT ^CR

WHT

52C1

YLW

WHT

^WHTWHT

BLU

RED

BLK

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

X62

NAME

SYMBOL

NAME

OUTDOOR FAN MOTOR

COMPRESSOR CAPACITOR

OUTDOOR FAN MOTOR CAPACITOR

SURGE ABSORBER 1

FUSE(2A)

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

CONTACTOR

FUSE(2A)

NR61

RT61

VARISTOR

THERMOSTAT (AIR FLOW CONTROL)

DC/DC CONVERTER

21S4

52C

26F1

IC881

DEFROST THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

DSAR

F61

COMPRESSOR CONTACTOR

FAN MOTOR RELAY

SURGE ABSORBER 2

SURGE ABSORBER 3

SR61

52C1

COMPRESSOR<INNER THERMOSTAT>

TB. TB2

NOTE:1. Use copper conductors only.(For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers.

3. Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

4. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

MSH-07NV - MSH-09NV - MSH-12NV -

MODELS WIRING DIAGRAM

INDOOR UNIT

TO OUTDOOR

UNIT

SR11

BRN

RT12

RT11

❈

112

CONNECTING

BRN

❈

HIC1

111

12VDC

RED

❈

BLU

F12

BLK

CN201

❈

220-240V~

WHT

BLU

GRY

YLW

NR11

C11

121

52C

❈

BLU

TRANS

BLU

❈

BRN

WHT

RED

BLU

F11

122

POWER

SUPPLY

CORD

CN211

151

LD101

GUARD

PLATE

ELECTRONIC CONTROL P.C BOARD

~/N 220-240V

50Hz

POWER MONITOR,

RECEIVER

CIRCUIT BREAKER

P.C.BOARD

FOR MULTI SYSTEM

TO OUTDOOR^12VDC

UNIT

REMOTE

CONNECTING

CONTROLLER

SYMBOL

C11

NAME

SYMBOL

NAME

SYMBOL

TERMINAL BLOCK

NAME

INDOOR FAN MOTOR CAPACITOR

FUSE(93:)

VARISTOR

NR11

RT11

RT12

52C

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

CONTACTOR

DC/DC CONVERTER

SOLID STATE RELAY

VANE MOTOR

F12

HIC1

SR11

FUSE(3.15A)

F11

INDOOR FAN MOTOR

NOTE:1. For the outdoor 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

MUH-07NV -

MUH-09NV -

MODELS WIRING DIAGRAM

21S4

OUTDOOR UNIT

RT61

CN661

CN721

X62

F61

12VDC

❈

RED

SR61

CN730

RED

WHT

220-240V~

❈

C65

IC881

NR61

TRANS

BLU

WHT

BLK

TAB20

BLU

52C

4 3

CN711

X62

❈

DEICER P.C. BOARD

WHT

GRN/YLW

RED

❈

BLK

SYMBOL

NAME

SYMBOL

X62

SYMBOL

C65

OUTDOOR FAN MOTOR

COMPRESSOR CAPACITOR

FUSE(2A)

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

CONTACTOR

FAN MOTOR CAPACITOR

DC/DC CONVERTER

TERMINAL BLOCK

VARISTOR

F61

NR61

RT61

21S4

52C

IC881

COMPRESSOR<INNER THERMOSTAT>

SOLID STATE RELAY

DEFROST THERMISTOR

SR61

NOTE:1. Use copper conductors only.(For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers.

3. Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

4. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

MUH-12NV -

MODEL WIRING DIAGRAM

OUTDOOR UNIT

21S4

RT61

12VDC

RED

WHT

BLU

CN661

CN721

❈

X62

CN730

RED

WHT

RED

SR61

220-240V~ 2

ORN

WHT

BLK

TRANS

❈

CN711

52C

TAB20

X62

❈

DEICER P.C.BOARD

GRN/YLW

WHT

BLU

RED

BLK

_SMC

SYMBOL

NAME

SYMBOL

X62

SYMBOL

C65

OUTDOOR FAN MOTOR

COMPRESSOR CAPACITOR

FUSE(2A)

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

CONTACTOR

FAN MOTOR CAPACITOR

DC/DC CONVERTER

TERMINAL BLOCK

VARISTOR

F61

NR61

RT61

21S4

52C

IC881

COMPRESSOR<INNER THERMOSTAT>

SOLID STATE RELAY

DEFROST THERMISTOR

SR61

NOTE:1. Use copper conductors only.(For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers.

3. Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

4. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

MSH-18NV -

MODEL WIRING DIAGRAM

INDOOR UNIT

❈

~/N

FOR MULTI SYSTEM

12VDC

TO OUTDOOR

UNIT

CONNECTING

;

SYMBOL

NAME

SYMBOL

NR11

RT11

NAME

SYMBOL

NAME

INDOOR FAN CAPACITOR

FUSE(93:)

VARISTOR

TERMINAL BLOCK

SURGE ABSORBER

DC/DC CONVERTER

C11

F12

F11

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

HYBRID IC

DSAR

HIC1

FUSE(3.15A)

RT12

IC141

52C

INDOOR FAN MOTOR

VANE MOTOR

CONTACTOR

NOTE:1. For the outdoor 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

MUH-18NV -

MODEL WIRING DIAGRAM

OUTDOOR UNIT

❈

SYMBOL

NAME

COMPRESSOR CAPACITOR

SYMBOL

NAME

SYMBOL

X62

NAME

OUTDOOR FAN MOTOR

VARISTOR

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

CONTACTOR

C65

DSAR

F61

OUTDOOR FAN MOTOR CAPACITOR

SURGE ABSORBER

FUSE(2A)

NR61

RT61

SR61

21S4

DEFROST THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

52C

DC/DC CONVERTER

IC881

COMPRESSOR<INNER THERMOSTAT>

NOTE:1. Use copper conductors only.(For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers.

3. Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

4. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

MSH-24NV -

MODEL WIRING DIAGRAM

INDOOR UNIT

❈

220-240V~

RED

WHT

RT12

RT11

112

F12

220-240V~ 2

HIC1

IC141

❈

111

TO OUTDOOR

UNIT

_BLU2

BLU

BRN

❈

121

CN201

52C

YLW

GRY

WHT

RED

BLK

CONNECTING

❈

BLU

TRANS

CN211

F11

WHT

POWER

SUPPLY

CORD

101

102

¹⁵¹ELECTRONIC CONTROL P.C BOARD

~/N 220-240V

50Hz

RECEIVER

DISPLAY

P.C.BOARD

CIRCUIT BREAKER

GRN/YLW

REMOTE

CONTROLLER

SYMBOL

NAME

SYMBOL

NR11

RT11

NAME

SYMBOL

NAME

INDOOR FAN CAPACITOR

FUSE(93:)

VARISTOR

TERMINAL BLOCK

NOISE FILTER

C11

F12

F11

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

HYBRID IC

FUSE(3.15A)

DC/DC CONVERTER

RT12

IC141

52C

HIC1

INDOOR FAN MOTOR

VANE MOTOR

CONTACTOR

NOTE:1. For the outdoor 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

MUH-24NV -

MODEL WIRING DIAGRAM

RT61

OUTDOOR UNIT

21S4

YLW

BLK

YLW

BLK

BRN

WHT WHT

ORN

RED

ORN

RED

CN661

CN721

CN711 ^{1 2 3 4}

CN730

X62

12VDC

❈

RED

IC881

TRANS

WHT

220-240V~

❈

WHT F

RED

RED 8

BLU

ORN

❈

TB2

26F1

TAB20

❈

BLU

52C

YLW

52C1

DEICER

3 ❈ 4

❈

P.C. BOARD

VLT

WHT

YLW

WHT

52C1

WHT

BLU

RED

BLK

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

X62

NAME

COMPRESSOR CAPACITOR

FAN MOTOR CAPACITOR

SURGE ABSORBER 1

SURGE ABSORBER 2

SURGE ABSORBER 3

FUSE(2A)

OUTDOOR FAN MOTOR

VARISTOR

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

CONTACTOR

NR61

RT61

SR61

TB,TB2

21S4

52C

DEFROST THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

FUSE(2A)

DSAR

COMPRESSOR CONTACTOR

DC/DC CONVERTER

FAN MOTOR RELAY

52C1

IC881

F61

COMPRESSOR<INNER THERMOSTAT>

THERMOSTAT (AIR FLOW CONTROL)

26F1

NOTE:1. Use copper conductors only.(For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers.

3. Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

4. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

MSH-18NV -

MODEL WIRING DIAGRAM

TO OUTDOOR

INDOOR UNIT

UNIT

BRN

❈

112

RT12

CONNECTING

HIC1

BRN

❈

IC141

12VDC

RED

❈

BLU

F12

BRN

121

220-240V~

WHT

❈

^BLU1

❈

YLW

GRY

WHT

RED

BLK

52C

CN201

CN211

TRANS

BLU

❈

BLU

111

BLU

BRN

F11

LD1

POWER

SUPPLY

CORD

151

CN CN

102

RT11

101

ELECTRONIC CONTROL P.C BOARD

~/N 220-240V

50Hz

GRN/YLW

DISPLAY

RECEIVER

P.C.BOARD

CIRCUIT BREAKER

P.C.BOARD

FOR MULTI SYSTEM

12VDC 3

TO OUTDOOR

UNIT

REMOTE

CONTROLLER

CONNECTING

SYMBOL

NAME

SYMBOL

NR11

RT11

NAME

SYMBOL

NAME

INDOOR FAN CAPACITOR

FUSE(93:)

VARISTOR

TERMINAL BLOCK

C11

F12

F11

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

HYBRID IC

SURGE ABSORBER

DC/DC CONVERTER

DSAR

HIC1

FUSE(3.15A)

RT12

IC141

52C

INDOOR FAN MOTOR

VANE MOTOR

CONTACTOR

NOTE:1. For the outdoor 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

MUH-18NV -

MODEL WIRING DIAGRAM

OUTDOOR UNIT

21S4

52C

RT61

❈

CN730

12VDC

RED

WHT

CN661

F61

CN721

CN720

SR61

X62

RED

WHT

RED

❈

220-240V~2

ORN

WHT

BLK

TAB21

❈ BLU

BLK

TRANS

❈

CN711

X62

TAB20

DEICER P.C.BOARD

52C

WHT

WHT NO

BLU

COM

GRN/YLW

RED

BLK

SYMBOL

NAME

SYMBOL

NAME

SYMBOL

X62

NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN MOTOR CAPACITOR

SURGE ABSORBER

OUTDOOR FAN MOTOR

VARISTOR

REVERSING VALVE COIL RELAY

REVERSING VALVE COIL

CONTACTOR

C65

DSAR

F61

NR61

RT61

SR61

21S4

DEFROST THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

52C

FUSE(2A)

DC/DC CONVERTER

IC881

COMPRESSOR<INNER THERMOSTAT>

NOTE:1. Use copper conductors only.(For field wiring)

2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers.

3. Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve.

2.Pull the wire while

pushing the locking

lever.

4. “❈”show the terminals with a lock mechanism, so they cannot be removed when you pull

the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

REFRIGERANT SYSTEM DIAGRAM

Unit:mm

MSH-07NV -

MUH-07NV -

Refrigerant pipe [ 9.52

(Option)

Muffler

Reversing valve

(4-way valve)

INDOOR UNIT

OUTDOOR UNIT

(with heat insulator)

Indoor coil

Indoor

Outdoor

heat

exchanger

thermistor

RT12

heat

exchanger

Stop valve

(with service

port)

Strainer

Defrost

thermistor

RT61

Flared connection

Room temperature

thermistor

Capillary tube

[1.4x800 (2 pcs)

RT11

Accumulator

Capillary tube

[1.6x750

Check

valve

Flared connection

Reversing valve coil

(4-way valve coil)

heating ON

Strainer

Stop valve

Capillary tube

[1.4x850

Refrigerant pipe [6.35

(Option)

cooling OFF

Refrigerant flow in cooling

Refrigerant flow in heating

(with heat insulator)

Unit:mm

MUH-09NV -

MSH-09NV -

Muffler

Refrigerant pipe [9.52

(Option)

Reversing valve

(4-way valve)

OUTDOOR UNIT

INDOOR UNIT

(with heat insulator)

Indoor coil

Indoor

thermistor

RT12

Outdoor

heat

exchanger

heat

exchanger

Stop valve

(with service

port)

Strainer

Defrost

thermistor

RT61

Flared connection

Room temperature

thermistor

Capillary tube

[1.4x800 (2 pcs)

RT11

Accumulator

Capillary tube

[1.6x400

Check

valve

Flared connection

Reversing valve coil

(4-way valve coil)

heating ON

Strainer

Stop valve

Capillary tube

[1.6x1300

Refrigerant pipe [6.35

(Option)

cooling OFF

Refrigerant flow in cooling

Refrigerant flow in heating

(with heat insulator)

Unit:mm

MUH-12NV -

MSH-12NV -

Reversing valve

(4-way valve)

Refrigerant pipe [12.7

(Optional)

OUTDOOR UNIT

INDOOR UNIT

(with heat insulator)

Muffler

Indoor

heat

exchanger

Indoor coil

thermistor

RT12

Outdoor

heat

exchanger

Stop valve

(with service port)

Flared connection

Defrost

thermistor

RT61

RT11

Room temperature

thermistor

RT11

Accumulator

Compressor

Capillary tube

[1.6x400

Flared connection

Capillary tube

[1.4x500

Reversing valve coil

(4-way valve coil)

heating ON

Strainer

cooling OFF

Stop valve

Refrigerant pipe

(Option) [6.35

Refrigerant flow in cooling

Check

valve

(with heat insulator)

Refrigerant flow in heating

Unit:mm

MUH-18NV -

MSH-18NV -

Reversing valve

(4- way valve)

OUTDOOR UNIT

Refrigerant pipe [15.88

(Option)

INDOOR UNIT

Muffler

(with heat insulator)

Indoor coil

Indoor

heat

exchanger

thermistor

RT12

Strainer

Stop valve

(with service port)

Outdoor

heat

exchanger

Distributor

Defrost

thermistor

RT61

Flared connection

Room temperature

thermistor

RT11

Accumulator

Compressor

Capillary tube

[1.6x750

(2 pcs)

Flared connection

Capillary tube

[2.0X800

Strainer

Reversing valve coil

(4-way valve coil)

heating ON

Stop valve

Refrigerant pipe

(Option) [6.35

cooling OFF

Check

valve

(with heat insulator)

Refrigerant flow in cooling

Refrigerant flow in heating

Unit:mm

MUH-24NV -

MSH-24NV -

Reversing valve

(4- way valve)

OUTDOOR UNIT

INDOOR UNIT

Refrigerant pipe [15.88

(Option)

(with heat insulator)

Muffler

Indoor coil

thermistor

RT12

Strainer

Indoor

heat

Ball valve

exchanger

Outdoor

heat

Distributor

Flared connection

exchanger

Room temperature

thermistor

RT11

Accumulator

Defrost

thermistor

RT61

Compressor

Discharge pressure

regurator open

23.5 kgf/J

Flared connection

Capillary tube

[1.6X350

Check

valve

Strainer

Ball valve

with Service port

Capillary tube

[2.4X200

Refrigerant pipe

(Option) [9.52

(with heat insulator)

Check

valve

Refrigerant flow in cooling

Refrigerant flow in heating

Capillary tube

[2.0X350

MAX. REFRIGERANT PIPING LENGTH

Refrigerant piping

Piping size O.D : mm

Length of connecting pipe : m

Outdoor unit

Models

Max. length : m

Indoor unit

Gas

9.52

12.7

Liquid

MSH-07NV - E1

MSH-09NV - E1

MSH-07NV - E2

MSH-09NV - E2

MSH-12NV - E1

MSH-12NV - E2

6.35

9.52

0.43

MSH-18NV - E1

MSH-18NV - E2

MSH-18NV - E3

MSH-24NV - E1

MSH-24NV - E2

15.88

MAX. HEIGHT DIFFERENCE

ADDITIONAL REFRIGERANT CHARGE(R-22 : g)

Refrigerant piping length (one way)

10m

Outdoor unit precharged

Models

15m

(up to 7m)

MSH-07NV - E1

MSH-09NV - E1

MSH-07NV - E2

MSH-09NV - E2

MSH-12NV - E1

MSH-12NV - E2

850

150

1150

1800

MSH-18NV -

400

MSH-18NV -

Calculation : Xg=50g/m ✕ (A-7)m

Refrigerant piping length (one way)

10m

Outdoor unit precharged

(up to 7m)

Models

15m

520

MSH-24NV -

2400

195

Calculation : Xg=65g/m ✕ (A-7)m

EVACUATION PROCEDURES(AIR PURGE)

Connect the refrigerant pipes (both the liquid and gas pipes)

between the indoor and the outdoor units.

Remove the service port cap of the stop valve on the side of the outdoor unit gas pipe.(The stop valve will not

work in its initial state fresh out of the factory (totally closed with cap on))

When vacuuming

Connect the gage manifold valve and the vacuum pump to

the service port of the stop valve on the liquid pipe side of the

outdoor unit.

Run the vacuum pump for more than 15 minutes and at this

time confirm that the pressure gage indicates –0.1 Mpa.

Check the vacuum with the gage manifold valve, then close

the gage manifold valve, and stop the vacuum pump.

Leave it as it is for one or two minutes. Make sure the pointer

of the gage manifold valve remains in the same position.

Remove the gage manifold valve quickly from the service port of the stop valve.

After refrigerant pipes are connected and evacuated, fully open all stop valves on gas and liquid pipe sides.

Operating without fully opening lowers the performance and causes trouble.

Pipe length :

7m maximum

No gas charge

is needed

Pipe length

exceeding 7m

Charge the prescribed

amount of gas

Tighten the cap to the service port to obtain the initial status.

Retighten the cap.

Leak test

PERFORMANCE CURVES

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 pro-

vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

Rated voltage : ±10% (198 ~ 264V

),50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature :

(2) Indoor outlet air wet-bulb temperature :

(3) Outdoor intake air dry-bulb temperature :

(4) Total input:

(5) Indoor intake air dry-bulb temperature :

(6) Outdoor intake air wet-bulb temperature :

(7) Total input :

°CWB

°CDB

°CWB

Cooling

Heating

}

Indoor air wet/dry-bulb temperature difference on the left side of the chart on next 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 wet-and 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 room.

5. Press the EMERGENCY OPERATION switch once(twice) to start the EMERGENCY COOL(HEAT) 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.

OUTDOOR UNIT

INDOOR UNIT

Wet-and dry-bulb

thermometers

Wet-and dry-bulb

thermometers

12.0

11.4

10.4

9.4

14.0

12.7

11.5

10.3

9.2

9.1

8.5

7.6

8.1

19.9

25.5 28.7

28.0

25.9

23.7

21.6

28.0

25.9

23.7

21.6

23.5 26.5

21.6 24.3

19.6 22.5

18.4

16.9

15.3

13.8

12.3

10.7

9.2

17.6 19.9

15.6 17.7

13.7 15.5

19.4

17.2

15.1

19.4

17.2

15.1

11.7 13.2

12.9

NOTE:The above curves are for the heating operation without any frost.

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

COOL operation

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

Relative humidity(%)

Dry-bulb temperature

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 • G) =10.2(kgf/f• G)

(kgf/F•G)(MPa•G)

MUH-07NV -

0.7

220V

0.6

240V

220/240V

0.5

0.4

0.3

Ambient temperature(˚C)

Ambient humidity(%)

Ambient temperature(˚C)

Ambient humidity(%)

(kgf/F•G)(MPa•G)

MUH-09NV -

0.7

220V

0.6

240V

0.5

220/240V

0.4

0.3

Ambient temperature(˚C)

Ambient humidity(%)

Ambient temperature(˚C)

Ambient humidity(%)

(kgf/F•G)(MPa•G)

MUH-12NV -

0.7

220V

240V

0.6

0.5

220/240V

0.4

0.3

Ambient temperature(˚C)

Ambient humidity(%)

Ambient temperature(˚C)

Ambient humidity(%)

_{(kgf/F•G)(MPa•G)}MUH-18NV -

MUH-18NV -

0.7

220/240V

0.6

220V

0.5

0.4

240V

0.3

0.2

Ambient temperature(˚C)

Ambient humidity(%)

Ambient temperature(˚C)

Ambient humidity(%)

(kgf/F•G)(MPa•G)

MUH-24NV -

0.7

220V

0.6

240V

0.5

0.4

0.3

0.2

Ambient temperature(˚C)

Ambient humidity(%)

Ambient temperature(˚C)

Ambient humidity(%)

HEAT operation

Outdoor:Dry bulb temperature 7,15,20°C

Wet bulb temperature 6,12,14.5°C

Condition indoor:Dry bulb temperature 20.0°C

Wet bulb temperature 14.5°C

MUH-12NV -

MUH-07NV -

220V

240V

220V

240V

Ambient temperature(˚C)

MUH-09NV -

MUH-18NV -

220V

240V

220V

240V

Ambient temperature(˚C)

MUH-24NV -

220V

240V

Ambient temperature(˚C)

MICROPROCESSOR CONTROL

Wireless remote controller

MSH-07NV -

MSH-18NV -

MSH-07NV -

MSH-18NV -

MSH-09NV -

MSH-24NV -

MSH-09NV -

MSH-24NV -

MSH-12NV -

MSH-18NV -

Once the controls are set, the same operation mode can be

repeated by simply turning the OPERATE/STOP 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 button on the remote controller.

OPERATION INDICATOR lamp of the indoor unit will turn

on with a beep tone.

(2) Press OPERATION SELECT button to set “I FEEL CON-

TROL”(

). Then a beep tone is heard.

(3) The operation mode is determined by the initial room

temperature at start-up of the operation.

Initial room temperature

Mode

COOL mode of

"I FEEL CONTROL"

more than 25:

DRY mode of

"I FEEL CONTROL"

23: to 25:

HEAT mode of

"I FEEL CONTROL"

less than 23:

● Once the mode is fixed, the mode will not change by

room temperature afterwards.

● Under the ON-TIMER (

) operation, mode is deter-

mined according to the room temperature as the opera-

tion starts.

● When the system is stopped with the OPERATE/STOP

button 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.

Example

Restart

COOL mode of

“I FEEL CONTROL”

Previous operation

COOL mode of

“I FEEL CONTROL”

or COOL mode

● When the system is restarted after 2 hours, the operation

mode is determined by the initial room temperature at

start-up of the operation.

Restart

Example

COOL or DRY or

HEAT mode of “I FEEL

CONTROL” that deter-

mined by initial room

temperature at start-up

of the operation.

Previous operation

COOL mode of

“I FEEL CONTROL”

or COOL mode

INDOOR UNIT DISPLAY SECTION

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

Model

Initial room temperature

Initial set temperature

26:or more

24:

COOL mode of

❈1

"I FEEL CONTROL"

Initial room temperature

26: or less

23: or 25:

23: or less

minus 2:

Initial room temperature

minus 2:

DRY mode of

"I FEEL CONTROL"

HEAT mode of

"I FEEL CONTROL"

26:

❈1 After the system restarts by the remote controller, the system operates with the previous set temperature regardless of

the initial set temperature.

The set temperature is calculated by the previous set temperature.

(5) TEMPERATURES buttons

In “I FEEL CONTROL” (

) mode, set temperature is decided by the microprocessor based on the room temperature.

In addition, set temperature is 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.

▲ TOO

…

COOL

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

▼ TOO

WARM

…

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

— COOL mode of “I FEEL CONTROL” —

OFF

Compressor and

outdoor fan motor

Run continuously in cooling mode

Indoor fan motor

NOTE : Coil frost prevention during COOL mode of “I FEEL CONTROL”

There are two types of controls in coil frost prevention.

① Temperature control

<MSH-07/09/12> When the indoor coil thermistor RT12 reads 4°C or below for 5 minutes, the coil frost prevention mode

starts.

<MSH-18/24>When the indoor coil thermistor RT12 reads 3°C or below, the coil frost prevention mode starts immediately.

However the coil frost prevention will not work for 5 minutes after the compressor starts.

The compressor stops and the indoor fan operates at the set speed for 5 minutes.

After that, if RT12 still reads below 4°C (MSH-07/09/12) or below 3°C (MSH-18/24) this mode prolonged until the RT12

reads over 4°C (MSH-07/09/12) or 3°C (MSH-18/24).

② Time control

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

a. Compressor has been continuously operating.

b. Indoor fan speed is Lo or Me.

c. Room temperature is below 26°C.

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

beginning.

Time counting also stops temporarily when the indoor fan speed becomes Hi or the room temperature exceeds

26°C.However, when two of the above conditions (b.and c.) are satisfied again.Time accumulation is resumed.

●Indoor fan operates at the set speed by FAN SPEED CONTROL button.

Followings are the fan speed in AUTO.

Initial temperature difference

Fan Speed

Room temperature minus set temperature : 2 degrees or more ··············································Hi

Room temperature minus set temperature : 1 degree or more and less than 2 degrees·······Me

Room temperature minus set temperature : less than 1 degree··············································Lo

2 deg.

4 deg.

1.66 deg.

1 deg.

—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 temperature and the microprocessor.

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

decrease.

The operation of the compressor and indoor fan is as follows.

1. When the room temperature is 23°C or over:

Compressor operates by temperature control and time control.

① Set temperature is controlled to fall 2°C as initial set temperature.

② 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.

Indoor fan and outdoor fan operate in the same cycle as the compressor.

2. 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.

Operation time chart

Example

1st ON

OFF

Thermostat

Indoor fan

OFF

Outdoor fan

compressor

1 min.

3 min.

8 min.

4 min.

NOTE ● Coil frost prevention during DRY mode of “I FEEL CONTROL”

The operation is as same as coil frost prevention during COOL mode of “I FEEL CONTROL”.

However the indoor fan speed becomes the set speed or Lo.

— HEAT mode of “I FEEL CONTROL” —

1. Indoor fan speed control

(1) Followings are the fan speed in AUTO.

Initial temperature difference

Fan speed

Set temperature minus room temperature: 2 degrees or more················································· Hi

Set temperature minus room temperature: 1 degree or more and less than 2 degrees··········· Me

Set temperature minus room temperature: less than 1 degree················································· Lo

(2) Cold air prevention control

2 deg.

4 deg.

1 deg.

1.66 deg.

The fan runs at set speed when the indoor coil thermistor RT12 temperature exceeds 22°C. The fan operates at VLo

when the temperature is below 18°C. But the fan stops when the indoor fan operates at VLo and the temperature is

15°C or less.

NOTE : At initial in hysteresis this control works.

Released

Cold Air Prevention

18: 22:

(3) New warm air control.

When compressor starts in heating operation or after defrosting, the fan changes the speed due to the indoor coil ther-

mistor RT12 temperature to blow out warm air.

After releasing of cold air prevention, when the indoor coil temperature is 37°C or above, the fan speed shifts to the set

speed, and when the fan speed is changed by the remote controller, the fan speed is the set speed.

When the indoor coil temperature is less than 37°C, the fan speed is controlled by time as below.

less than 2 minutes························Lo

2 minutes to 4 minutes···················Me

4 minutes or more··························Hi

The upper limit of the fan speed is the set speed.

If the thermostat turns off, this operation changes to flow soft control.

(4) Flow soft control

After the thermostat turns off, the indoor fan operates at VLo.

NOTE : When the thermostat turns on, the fan operates at the set speed. Due to the cold air prevention control, the fan

does not start until the indoor coil thermistor RT12 reads 22°C or more.

2. High pressure protection

During heating operation, the outdoor fan motor is controlled by the indoor coil thermistor RT12 temperature for excess rise

protection of compressor discharge pressure.

Outdoor fan OFF : 52°C (MSH-07/09/12/24), 50°C (MSH-18)

Outdoor fan ON : 48°C (MSH-07/09/12/24), 46°C (MSH-18)

High pressure protection time chart

Indoor coil thermistor

RT12 temperature

Outdoor fan motor

turn OFF

52˚C(MSH-07/09/12/24)

50˚C(MSH-18)

Outdoor fan motor

turn ON

48˚C(MSH-07/09/12/24)

46˚C(MSH-18)

Outdoor fan motor

OFF

NOTE 1 :When the outdoor fan is OFF in heating, defrosting of outdoor heat exchanger is not detected by the defrost thermis-

tor RT61.

NOTE 2 :When connected to MXZ-32NV-

outdoor unit,the MSH-07/09/12NV- , MSH-07/09/12/18NV-

and

MSH-18NV-

indoor unit sends the data for the temperature to the outdoor unit according to the indoor coil temper-

ature.For the further information,refer to the service manual No.OB185.

3. Defrostings

Defrostings of outdoor heat exchanger is controlled by DEICER P.C. board, with detection by the defrost thermistor RT61.

(1) Defrost starting conditions

When all conditions of a) ~ c) are satisfied, the defrosting operation starts.

a) Under the heat operation, the compressor cumulative operation time exceeds 40 minutes without the defrosting opera-

tion working.

b) The defrost thermistor RT61 reads - 3°C or less.

c) After releasing the high pressure protection 4 minutes and 15 seconds have elapsed.

(2) Defrost terminating conditions

When the condition d) or e) is satisfied, the defrosting operation stops.

d) The defrost thermistor RT61 reads 3.1°C or more.

e) The defrosting time exceeds 10 minutes.

(3) Defrosting time chart

Defrost thermistor RT61

3.1: or more

-3: or less

Outdoor 52C

relay(Compressor)

OFF

X62

(Reversing valve coil)

15 sec.

30 sec.

OFF

30 sec.

5~15 sec.

SR61

Outdoor fan

OFF

Defrost

counter

OFF

Max 10 min.

❈

VLo

Indoor fan

OFF

Horizontal

Indoor vane

Set position

NOTE1 ● When the indoor coil thermistor reads above 18°C, indoor fan operates at VLo for 30 seconds.

● When the indoor coil thermistor reads 18°C or less, the indoor fan stops.

NOTE2: Refer to the Service Manual OB185 when MSH-07/09/12NV- , MSH-07/09/12/18NV- , and MSH-18NV-

are connected with MXZ-32NV-

as multi system units.

4. Reversing valve control

Heating · · · · · ON

Cooling · · · · · OFF

Dry · · · · · · · · OFF

NOTE1: The Reversing valve reverses for 5 seconds right before start-up of the compressor.

NOTE2: Refer to the Service Manual OB185 when MSH-07/09/12NV- , MSH-07/09/12/18NV- , and MSH-18NV-

are connected with MXZ-32NV-

as multi system units.

(HEAT)

5 sec.

(COOL / DRY)

5 sec.

OFF

Compressor

OFF

Reversing valve

OFF

Outdoor fan

8-2. COOL (

) OPERATION

(1) Press OPERATE/STOP button.

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

(2) Select COOL mode.

(3) Set the TEMPERATURES button.

(TOO WARM or TOO COOL button)

The setting range is 16 ~ 31°C

✻ Indoor fan continues to operate regardless of

thermostat’s OFF-ON

✻ Coil frost prevention is as same as COOL

mode of “I FEEL CONTROL”

8-3. DRY (

) OPERATION

(1) Press OPERATE/STOP button.

OPERATION INDICATOR of the indoor unit

turns on with a beep tone.

(2) Select DRY mode.

(3) The microprocessor reads the room tempera-

ture and determines the set temperature. Set

temperature is as shown on the right chart.

Thermostat (SET TEMP.)does not work.

The other operations are same as DRY mode of

“I FEEL CONTROL”.

(4) DRY operation will not function when the room

temperature is 13°C or below.

(5) When DRY operation functions, the fan speed

is lower than cool operation.

8-4. HEAT (

) OPERATION

(1) Press OPERATE/STOP button.

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

(2) Select HEAT mode.

(3) Press TEMPERATURES button (TOO WARM or TOO COOL button) to select the desired temperature.

The setting range is 16 ~ 31°C.

(4) Indoor fan speed control, high pressure protection, defrosting, heater control are the same as HEAT mode of “I FEEL

CONTROL”.

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 (Hi,Me,Lo,SLEEP),

the microprocessor controls SR11 (MSH-07/09/12), IC141 (MSH-18/24) 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.

SLEEP

(2) Fan motor lock-up protection

When the rotational frequency feedback signal has 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 min-

utes 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. (See page 49.)

8-6. AUTO VANE OPERATION

(1) Vane motor drive

MSH-N series is equipped with a stepping motor for the vane. The rotating direction, speed, and angle of the motor are

controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor.

(2) The auto vane angle changes as follows by pressing the VANE CONTROL (

) button.

(3) Positioning

The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle.

The positioning is decided as follows.

(a) When the OPERATE/STOP button is pressed. (POWER ON/OFF)

(b) When the vane control is changed from AUTO to MANUAL.

(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 and operation to make the optimum

room-temperature distribution.

① In COOL and DRY operation

Vane angle is fixed to Angle 1.

➁ In HEAT operation

Vane angle is fixed to Angle 4.

(5) Dew prevention

During COOL or DRY operation at vane Angle 4 or 5 when the compressor cumulative operation time exceeds 1 hour, the

vane angle automatically changes to Angle 1 for dew prevention.

(6) SWING MODE (

)

By pressing the SWING button (

) vane swings vertically. The remote controller displays “ ”. SWING mode is cancelled

when the SWING button or VANE CONTROL button (

(7) Cold air prevention in HEAT operation

) is pressed or the operation stops or changes to other mode.

When either of the following conditions occurs in HEAT operation, the horizontal vane angle changes to Angle 1 automati-

cally to prevent cold air blowing on users.

① Compressor is not operating.

➁ Defrosting is performed.

➂ Indoor coil thermistor RT12 reads 24: or below.

➃ Indoor coil thermistor RT12 temperature is raising from 24°C or below, but it does not exceed 28:.

Set position

Indoor coil thermistor RT12 temperature

Angle 1

24:

28:

NOTE:At initial in hysteresis this control works.

8-7. SLEEP MODE (

)

• When the SLEEP button ( ) is pressed, the indoor fan speed drops and the air flow sound from the

indoor unit is decreased.

• The indications of the remote controller are “

• When the FAN SPEED CONTROL button (

mode is released.

” and “

”.

) is pressed during the SLEEP mode, the SLEEP

8-8. TIMER OPERATION

1. How to set the timer

(1) Press OPERATE/STOP 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 “AM0:00” blinks at the current time display

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

(3) Press TIMER CONTROL button to select the operation.

“

” button... AUTO START operation (ON timer)

“

” button... AUTO STOP operation (OFF timer)

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

HR. and MIN. button will work when “

These marks disappear in 1 minute.

” or “

” mark is flashing.

When 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

TIME setting can be cancelled with the TIMER CONTROL buttons. (“

” or “

”)

To cancel the ON timer, press the “

” button.

To cancel the OFF timer, press the “

” button.

TIME 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 2) The current time is 11:00 AM.

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

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

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

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

8-9. EMERGENCY-TEST OPERATION

When the remote controller is missing, has failed or the batteries run down, press the EMERGENCY OPERATION switch

on the front of the indoor unit. The unit will start and the OPERATION INDICATOR lamp will light.

The first 30 minutes of operation will be the test run operation. This operation is for servicing. The indoor fan runs at high

speed and the system is in continuous operation. The thermostat is ON and the timer is reset to normal.

After 30 minutes of test run operation the system shifts to EMERGENCY COOL/HEAT MODE with a set temperature of 24°C.

The fan shifts to Me speed.

This operation continues until the EMERGENCY OPERATION switch is pressed or a button on the remote controller is

pressed, then normal operation will start.

The coil frost prevention circuit operates in this operation, and defrosting operates too.

In the test run or emergency operation, the horizontal vane operates in AUTO mode with a set temperature of 24°C.

Defrosting of outdoor heat exchanger works in EMERGENCY HEAT MODE.

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

Press once

<Cool>

Press again

<Heat>

Press once again

<Stop>

Emergency operation

switch

SERVICE FUNCTIONS

1. COMPULSORY DEFROSTING MODE FOR SERVICE

By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be accomplished

regardless of the defrost interval restriction. See Page 56 and 59.

Defrost thermistor RT61 must read below -3°C

2. DEFROST TERMINATION CHANGE

<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. (See page 56 and 59.)

<JPE> when the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed. (See page 56 and 59.)

MODEL

Junper wire

JPC

Change point

E1 E2

MSH-07/09/12NV-

Defrost interval time changes from 40 minutes to 15 minutes

E1 E2 E3

MSH-18NV-

MSH-24NV-

Deforst start temperature changes from -3:to 0:

E1 E2

JPE

Deforst finish temperature changes from 3.1:to 10.1:.

3. 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.

3-minute delay : 3-minute ➔ 3-second.

AUTO START : 1 hour ➔ 1-minutes

AUTO STOP : 1 hour ➔ 1-minutes

Short the connector during the timer mode.

}

4. 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.

(1)<The reset button can be located on the rear side.>

MSH-07NV -

MSH-18NV -

MSH-09NV -

MSH-12NV -

MSH-18NV -

How to modify the remote controller P.C. board

Remove batteries before modification.

The board has a print as shown below :

NOTE : For remodeling, take out the batteries at first.

After finish remodeling, put back the batteries then push the RESET button.

Originally, chip parts are fitted on J10/J20 side and there is no chip parts on the other side.

Remove the chip parts of J10/J20 side and connect Jumper wire to J11/J21 side as shown in Table 1.

Either J1O or J11 /J20 or J21 should be attached for normal operation.

Table.1

1 unit operation

2 units operation

Same as at left

Replace J10 with J 11

–

3 units operation

Same as at left

4 units operation

Same as at left

No. 1 unit

No modification

No. 2 unit

No. 3 unit

–

Same as at left

Replace J20 with J 21

Same as at left

Replace J10 with J11

Replace J20 with J21

No. 4 unit

–

NOTE : At power supply failure or installation, indoor unit deletes the memory about remote controller. When

the power supply is turned on and indoor unit receives the first signals from the remote controller, the

remote controller number is designated as the indoor unit number. Therefore at and after the second

time indoor unit accepts the remote controller of the initial setting number.

At setting - error, turn the power supply off to cancel the individual operation and then turn the power

supply on to restart the setting.

(2)<The reset button can be located on the front side.>

MSH-07NV - (Serial number 7000201T~) MSH-09NV - (Serial number 7000201T~)

MSH-12NV - (Serial number 7000001T~) MSH-24NV -

MSH-07NV -

MSH-12NV -

MSH-24NV -

MSH-09NV -

MSH-18NV - (Serial number 7000001T~)

MSH-18NV -

How to modify the remote controller P.C. board

Remove batteries before modification.

The board has a print as shown below :

NOTE : For remodeling, take out the

batteries at first.

After finish remodeling, put

back the batteries then

push the RESET button.

The P.C.board has the print “J1” and “J2”.Jumper wires are mounted to each “J1” and “J2”.Cut J1 and J2 according to the

number of indoor unit as shown in Table 1.

After modification,push the reset button.

Table.1

1 unit operation

2 units operation

Same as at left

Cut J1

3 units operation

Same as at left

Cut J2

4 units operation

Same as at left

No. 1 unit

No modification

No. 2 unit

No. 3 unit

–

No. 4 unit

–

Cut both J1 and J2

NOTE : At power supply failure or installation, indoor unit deletes the memory about remote controller. When

the power supply is turned on and indoor unit receives the first signals from the remote controller, the

remote controller number is designated as the indoor unit number. Therefore at and after the second

time indoor unit accepts the remote controller of the initial setting number.

At setting - error, turn the power supply off to cancel the individual operation and then turn the power

supply on to restart the setting.

5. AUTO RESTART FUNCTION

MSH-07NV -

MSH-12NV -

MSH-18NV -

MSH-09NV -

MSH-24NV -

When the indoor unit is controlled with the remote controller, the operation mode, 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 power

has restored after power failure.Then, the unit will restart automatically. However if the unit is operated in “I FEEL CON-

TROL.” 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”

1Turn off the main power for the unit.

2Removed the electronic control P.C. board and the display P.C.board. (See page 60 and 62.)

3Cut the RESISTOR JR07 (MSH-07/09/12) or JR06(MSH-18/24) on the indoor electronic control P.C.board.

MSH-07/09/12

MSH-18/24

IC141

C11

52C

CN201

IC101

RA102

CN151

JR06

JR07

Operation

1If the main power (220/240V AC) has been cut, the operation settings remain.

2After 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 remote controller was operated.

•If main power is cut while AUTO START/STOP timer is active ,the timer setting is cancelled when auto restart function

works.

•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 startting current, systematize other home appliance not to turn on at the same

time.

•When more than one air conditioners are connected under the same power system,compressor starting current as large

as that for all the compressors used flows at a time as soon as the units restart automatically.

Therefore, the specific counter-measures are required to prevent main voltage drop or the rush of starting current after

power failure by providing the system to allow the units to start in regular succession.

10 TROUBLESHOOTING

MSH-07NV -

MSH-18NV -

MSH-09NV -

MSH-24NV -

MSH-09NV -

MSH-24NV -

MSH-12NV -

MSH-18NV -

MSH-12NV -

MSH-07NV -

MSH-18NV -

10-1 Cautions on troubleshooting

10-1-1 Before troubleshooting, check the followings:

1) Check the power supply voltage.

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

10-1-2 Take care the followings 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.

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

components.

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

Housing point

Lead wiring

10-1-3 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) 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.

3) When troubleshooting, refer to the flow chart on page 48 and the check table on page 49.

10-1-4 How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, the remote controller can not be repaired only by the battery replacement. To operate the remote con-

troller normally, discharge the remote controller in the following order.

This remote controller has the reset button. After refilling new batteries, press the reset button with tip end of ball point

pen or the like, and then use the remote controller.

RESET button

There are two kind of remote controllers. A type has the RESET button at the back, and B type does it on the

front. How to use the two buttons are given in the Instruction Manual.

10-2 Instruction of troubleshooting

Start

Indoor unit

Indoor unit doesn’t

receive the signal from

remote controller.

Also, OPERATION INDI-

CATOR lamp doesn’t

flash, when the EMER-

GENCY OPERATION

switch is pressed.

Indoor unit oper-

ates. Outdoor unit

doesn’t operate.

OPERATION INDICATOR

lamp on the indoor unit is

flashing on and off.

dosen’t receive

the signal from

remote

controller.

2-time flash

Outdoor unit

operates in

only Test

Run opera-

tion.

Outdoor unit

doesn’t oper-

ate even in

Test Run

Refer to

”Check of

receiver P.C.

board” on page

51.

2.5-second OFF

3-time flash

operation.

Refer to

“Check of

indoor electronic control

P.C. board” on page 52.

2.5-second OFF

1-time flash

Refer to

“Check of

outdoor unit”

on page 52.

Check room

temperature

thermistor.

6-time flash

Cause:indoor/outdoor unit

connecting

Cause:Indoor unit

2-time-Room tempera-

ture/Indoor coil

thermistor trouble

3-time-Indoor fan motor

trouble

2.5-second OFF

Trouble of mis-wiring

(

Trouble of the serial signal

Cause:outdoor unit

6-time-Replace the out-

door thermistor

Refer to

“How to check

mis-wiring and sig-

nal error

Check room temperature

thermistor. Refer to“Test

point diagram and volt-

age” on page 55,57 and

58.

(when outdoor unit

doesn’t work)”

on page 53 and

54.❈1

Refer to

Check indoor coil

“Check of indoor

fan motor” on

page 51.

thermistor. Refer

to“Test point dia-

gram and voltage”

on page 55,57 and

58.

❈1<The case of the trouble of the serial signal>

When turn off the power and then turn on the power again, the

indication shows “the trouble of mis-wiring.”

10-2-1 troubleshooting check table

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

Self check table

Abnormal

point

NO.

Indication

Symptom

Detect method

Check point

0.5-second ON

When serial signal stops for 4

to 5 seconds after 1st on of

52C relay by POWER turning

on.

Mis-wiring

● Check wiring (visual check and conductiv-

ity check).

● Check indoor electronic control

P.C.board.

● Check outdoor DEICER P.C. board.

● Check electrical parts.

0.5-second OFF

1-time flash

Outdoor unit

does not run.

When serial signal from out-

door unit stops for 4 to 5 sec-

onds.

Serial sig-

nal

2.5-second OFF

2-time flash

● Check thermistor calibration.

● Reconnect connector.

● Check indoor electronic control P.C.board.

Indoor coil

thermistor

Detect Indoor coil/room tem-

perature thermistor short or

open circuit every 2 seconds

during operation.

Outdoor unit

does not run.

Room

tempera-

ture ther-

mistor

2.5-second OFF

● Disconnect connector CN211 and then

Indoor fan

repeats 12 sec-

onds ON and 3 When rotational frequency

minutes OFF. feedback signal is not emit

When the indoor during 12-second indoor fan

fan breaks, the operation.

fan keeps stop-

ping.

check connector CN121

to make

3-time flash

sure rotational frequency feedback signal

of 1.5V or over exists.

● Check indoor electronic control P.C.

board.

● Check indoor fan motor.

● Reconnect conector.

Indoor fan

motor

2.5-second OFF

6-time flash

● Shortage of refrigerent.

When the outdoor thermistor

Outdoor unit

● Check outdoor DEICER P.C. board.

Outdoor

thermistor

shorts or opens after the com-

does not run

pressor start-up.

2.5-second OFF

5-time flash

7-time flash

When the compressor opera-

tion is continuosly three times

● Check the inverter output.

● Check the compressor.

❈

Outdoor

power

system

Outdoor unit

interruped by overcurrent pro-

does not run

tection within 1 minute after

start-up , it stops operation.

2.5-second OFF

The outdoor unit stops opera-

❈

Outdoor

control

P.C. board

tion when it cannot properly

Outdoor unit

read data in the nonvolatile

does not run

● Check the outdoor control P.C.board.

memory of the outdoor control

P.C.board.

2.5-second OFF

10-time flash

❈

When the indoor unit detects

Outdoor

control

P.C. board

● Check the drain punp.

● Check the drain sensor.

● Check LEV.

Outdoor unit

does not run

drain abnormality and the

indoor coil temperature is too

low.

2.5-second OFF

When the operation mode of

each rooms is setted

COOL(includes DRY) and

HEAT at same time, it take

precedence the operation

mode runs first.

Outdoor unit

runs but the

indoor unit does

not run.

❈

Outdoor

control

P.C. board

●Adjust the operation mode.

light

flash

2.5-second OFF

❈

The indication is shown only when the indoor unit connects with the outdoor unit MXZ-32NV-

10-2-2 Trouble criterion of main parts

MSH-07NV-

MSH-18NV-

MSH-07NV-

MSH-18NV-

Part name

MSH-09NV-

MSH-24NV-

MSH-09NV-

MSH-24NV-

MSH-12NV-

MSH-18NV-

Check method and criterion

Figure

Room

temperature

thermistor

Measure the resistance with a tester.

(Part temperature 10°C ~ 30°C)

Normal

Abnormal

Indoor coil

thermistor

Opened or short-circuited

8kΩ ~ 20kΩ

Measure the resistance with a tester.

(Part temperature –10°C ~ 40°C)

Defrost

thermistor

Normal

Abnormal

Opened or short-circuited

5kΩ ~ 60kΩ

Measure the resistance between the terminals with a tester.

(Coil wiring temperature –10°C ~ 40°C)

WHT

Normal

Abnormal

AUX.

RED

MAIN

Compressor

07NV

09NV

12NV

18NV

24NV

BLK

3.67~4.50Ω

5.07~6.20Ω

0.85~1.04Ω

1.83~2.23Ω

1.85~2.28Ω 1.05~1.30Ω

2.88~3.52Ω

5.13~6.28Ω

C-R

C-S

Opened or

short-circuited

2.38~2.91Ω

3.44~4.21Ω

Measure the resistance between the terminals with a tester.

(Coil wiring temperature10°C ~ 30°C)

Normal

Abnormal

07/09/12NV

280 ~ 303Ω

313 ~ 336Ω

18/24NV

MAIN

AUX.

176 ~ 192Ω

240 ~ 261Ω

WHT-BLK

BLK-RED

Opened or

short-circuited

Indoor fan

motor

FUSE

Measure the voltage Power ON.

Normal

BLK

RED

WHT

Abnormal

BRN-YLW

4.5 ~ 5.5V

(When fan revolved one time)

0V➔5V➔0V

Remain 0V or 5V

YLW-GRY

(Approx.)

MAIN

AUX.

07NV

09NV

Measure the resistance between the terminals with a tester.

(Coil wiring temperature –10°C ~ 40°C)

BLK REDWHT

MAIN

AUX.

Outdoor fan

motor

12NV

18NV

Normal

Abnormal

12NV

114 ~ 141Ω

118 ~ 146Ω

–

18NV

24NV

07/09NV

192~236Ω

373~458Ω

–

BLK REDORN WHT

MAIN

WHT-BLK

BLK-RED

BLK-YLW

YLW-RED

102 ~ 126Ω

97.9 ~ 120Ω

55.3 ~ 67.6Ω

–

24NV

Opened or

short-circuited

AUX.1AUX.2

–

26.6 ~ 32.6Ω

55.5 ~ 67.8Ω

–

BLK YLW REDORNWHT

Vane motor

Measure the resistance between the terminals with a tester.

(Part temperature10°C ~ 30°C)

PNK

ROTOR

Normal

Abnormal

Vane motor

ORN

RED

07/09/12NV 282 ~ 305Ω

18/24NV 358 ~ 388Ω

Opened or short-circuited

YLW

BLU

INNER PROTECTOR

Check of indoor fan motor

Turn OFF power supply.

Check connector CN211 visually.

Inodoor fan does not operate.

Yes

Are lead wires connected?

Is soldered point nomal?

Yes

Reconnect the lead wires.

Resolder it.

Disconnect lead wires from connector CN211 on indoor electronic control P.C. board.

Measure resistance between lead wires

No.1 and No.4 and then No.1 and No.2(MSH-18/24)

No.1 and No.3 and then No.2 and No.3(MSH-07/09/12)

}

{

Replace the indoor electronic con-

trol P.C. board.

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

Yes ( 0 or ∞ )

(others)

Repair the indoor fan motor.

B Check of receiver P.C. board

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

Check the model name of remote

controller.

Is LCD display on remote con-

Replace the batteries.(see page 47.)

troller visible?

(not clear)

Yes

Remove batteries and then set them back.

Check if the unit operates with remote

controller.

Turn on a radio to AM and press switch on

remote controller.

Does the unit operate with remote

controller?

Yes

Replace 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?

Yes

● Re-install the unit away from lights.

● Attach a filter on receiving part.

Measure the voltage between

receiver P.C. board connector No.2⁽⁺⁾and No.1(MSH-18/24)

indoor electronic control P.C. board connector LD101 No.2 and JPG(MSH-07/09/12)

}

{

when remote controller button is pressed.

Yes

Is the voltage approx. 4V DC?

Replace the indoor electronic control P.C.

board.

No(5V or 0V DC)

Replace the receiver.

C Check of indoor electronic control P.C. board

The unit doesn’t operate with the

remote controller.

Replace the fuse.

Yes

Also, the OPERATION INDICA-

TOR lamp doesn’t light up by

pressing the EMERGENCY

OPERATION switch.

Trouble of indoor electronic con-

trol P.C. board.

Yes

Is fuse(F11)blown?

1.Pull out power supply

cord.

2.Measure resistance

between CN201

Is there resistance ?

(Approx.0Ω)

Be sure to check both fuse

and varistor in any case.

on indoor electronic

Check both “parts side”and “pattern

side”of indoor electronic control P.C.

board visually.

control P.C. board

and

on the terminal

block with a tester.

Trouble of fuse(F12)

Is varistor(NR11)burnt?

CN201

07/09NV

12/18NV

Yes

F12

Terminal

block

CN201

Replace the varistor.

F12

Terminal

block

CN201

24NV

Check of outdoor unit

Terminal

block

Compressor and outdoor fan do not operate.(Only indoor fan operates.)

Start

Press EMERGENCY OPERATION switch.

3-minute time delay works.

24NV

Is voltage applied to fan motor and compressor

relay normal when you look at checkpoints about

outdoor DEICER P.C.borad?

Replace

DEICER

P.C.board

Test run operation operates for 30 minutes.

Yes

Check voltage to terminal block of outdoor unit. Is

there AC220-240V to terminal block between

07/09/12/18NV

Check the outdoor DEICER P.C.board at first, then check

the outdoor fan motor and the compressor.

Check voltage to terminal block of indoor unit. Is

there AC220-240V to terminal block between

07/09/12/18NV

24NV

Check the continuity of indoor and outdoor unit connection.

Replace the indoor elec-

tronic control P.C. board.

Confirm wiring connection

at indoor terminal block.

E How to check mis-wiring and serial signal error (when outdoor unit does not work)

MSH-07NV

Start

MSH-09NV

MSH-12NV

MSH-18NV

❈ 1 Short circuit of JPG and JPS on the

1. Turn OFF power supply.

2. Turn ON power supply.

3. Press EMERGENCY OPERATION switch.

indoor electronic control P.C. board

enables self-check to be displayed in 3

seconds.

Serial signal error is indicated.

(0.5-sec.ON, 2.5-sec.OFF)

3 min. later, when relay 52C turns ON, what self-check result is

displayed on OPERATION INDICATOR lamp on indoor unit? ^❈1

Mis-wiring is indicated.(0.5-sec.ON, 0.5-sec.OFF)

Yes

Repair wiring.

Is there mis-wiring, poor contact, or wire disconnection?

1. Turn OFF power supply and disconnect in-out connecting wire on indoor side.

2. Short-circuit between indoor terminal block

and

3. Turn ON power supply and press EMERGENCY OPERATION switch.

Is there 20V DC between both ends of R132 when

relay (52C) turns ON?

( By tester, the stylus is between 0 ~ 20V. )

Replace the indoor electronic control

P.C. board.

Yes

•Turn OFF power supply.

•Connect ON in-out connecting wire.

•Turn ON power supply.

3 minutes later, when EMERGENCY OPERATION switch is pressed

and 52C relay turns ON, is there AC 220-240V between outdoor

Rectify in-out connecting wire.

terminal block

Yes

Under the same condition as 3 minutes later, when

EMERGENCY OPERATION switch is pressed and

Check and rectify fuse and varistor on out-

door DEICER P.C. board.

52C relay turns on, is there DC 5V between

J8 -J7 ^–

Yes

Under the same condition as 3 minutes later, when

EMERGENCY OPERATION switch is pressed and

52C relay turns on, is there DC 10V between both

ends of R601?

Rectify in-out connecting wire.

(By tester, the stylus is between 5 ~10V)

Yes

Replace the outdoor DEICER P.C. board.

E How to check mis-wiring and serial signal error (when outdoor unit does not work)

MSH-24NV

Start

❈ 1 Short circuit of JPG and JPS on the

1. Turn OFF power supply.

2. Turn ON power supply.

3. Press EMERGENCY OPERATION switch.

indoor electronic control P.C. board

enables self-check to be displayed in 3

seconds.

Serial signal error is indicated.

(0.5-sec.ON, 2.5-sec.OFF)

3 min. later, what self-check result is displayed on OPERATION

INDICATOR lamp on indoor unit? ^❈1

Mis-wiring is indicated.(0.5-sec.ON, 0.5-sec.OFF)

Yes

Repair wiring.

Is there in-out mis-wiring, poor contact, or wire disconnection?

1. Turn OFF power supply and disconnect in-out connecting wire on indoor side.

2. Short-circuit between indoor terminal block

and

3. Turn ON power supply and press EMERGENCY OPERATION switch.

3 minutes later,is there DC 20V between both ends

of R132?

( By tester, the stylus is between 0 ~ 20V. )

Replace the indoor electronic control

P.C. board.

Yes

•Turn OFF power supply.

•Connect ON in-out connecting wire.

•Turn ON power supply.

Replace in-out connecting wire of

Is there AC220~240V between outdoor terminal blocks

and

Yes

3 minutes later, when EMERGENCY OPERATION

switch is pressed is there DC 5V between J8 -J7

on outdoor DEICER P.C. board?

Check and rectify fuse and varistor on out-

door DEICER P.C. board.

–

Yes

3 minutes later, when EMERGENCY OPERATION

switch is pressed and 52C relay turns on, is there

DC 10V between both ends of R601?

Replace

in-out connecting wire.

(By tester, the stylus is between 5 ~10V)

Yes

Replace the outdoor DEICER P.C. board.

TEST POINT DIAGRAM AND VOLTAGE

MSH-18NV -

Indoor electric control P.C.board

Fan motor power supply

}

Fuse AC250V 3.15A

Power supply input

AC 220-240V

}

R132

}

DC 0 ~20V

C144

DC5V

}

C144

Room temperature thermistor(RT11)

Indoor coil thermistor(RT12)

Timer short mode point

Emergency operation

switch

JPG

DC12V

}

JP43

MUH-18NV -

Outdoor deicer P.C. board

R601

DC5~10V

Defrost

thermistor(RT61)

INPUT

AC 220-240V

Reversing valve coil

AC 220-240V

Outdoor fan motor

AC 220-240V

DEICER P.C. BOARD

Fuse

2A/250V

Defrost interval

time short pin

+ J8

DC5V

}

-- J7

Defrost termination

temperature change.

Jumper wire JPC and JPE

DC12V

52C

DC12V

TEST POINT DIAGRAM AND VOLTAGE

MSH-07NV -

MSH-09NV -

MSH-12NV -

Indoor electronic control P.C. board

Power supply input

AC 220-240V

}

CN201 No1

Varistor(NR11)

Fuse AC250V 3.15A

Room temperature

thermistor(RT11)

Indoor coil

thermistor(RT12)

Time short mode point

Indoor coil thermistor(RT12)

Room temperature thermistor(RT11)

R132

DC0~20V

P.C.board

TEST POINT DIAGRAM AND VOLTAGE

MSH-24NV - MSH-18NV -

Fan motor power supply

Fuse AC 250V 3.15A

Power supply input

AC 220-240V

}

C144

DC5V

}

C144

Room temperature

thermistor(RT11)

Indoor coil thermistor(RT12)

JPS

Time short mode point

JPS

Emergency operation switch

JPG

DC12V

JP41

}

R132

DC0~20V

P.C.board

MUH-07NV -

MUH-24NV -

MUH-12NV -

MUH-18NV -

MUH-09NV -

MUH-07NV -

MUH-18NV -

MUH-12NV -

MUH-09NV -

MUH-24NV -

Outdoor deicer P.C. board

R601

DC5~10V

Reversing valve

INPUT

AC 220-240V

Outdoor fan motor

coil

AC 220-240V

Defrost thermistor(RT61)

DEICER P.C. BOARD

Fuse 2A/250V

Defrost interval

time short pin

DC5V

}

DC12V

Defrost termination

temperature change.

Jumper wire JPC and JPE

52C

DC12V

DISASSEMBLY INSTRUCTIONS

NOTE:

❈ On the wiring diagram shows the terminals with a lock mechanism, so it

cannot be removed when you pull the lead wire Be sure to pull the wire by

pushing the locking lever (projected part) of the terminal with a finger.

① Slide the sleeve.

➁ Pull the wire while pushing

the locking lever.

11-1 MSH-07NV -

MSH-07NV -

MSH-09NV -

MSH-12NV -

INDOOR UNIT

PHOTOS

OPERATING PROCEDURE

1. Removing the front panel

Photo 1

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

Front panel

Remove the screws.

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

catches at the top.

Screw

2. Removing the electronic control P.C. board and the

display P.C. board.

Photo 2

Room temperature

thermistor connector

(1) Remove the front panel. (Refer to 1)

(2) Remove the screw of the electrical cover.

Remove the electrical cover.

Ground wire screw

(3) Disconnect the room temperature thermistor and the con-

nector from the indoor coil thermistor.

(4) Remove the terminal cover.

Cord clamp

Remove the screw of the terminal block.

(5) Remove the cord clamp.

(6) Disconnect all the connectors on the electronic control P.C.

board.

(7) Remove the screw of the ground wire.

(8) Disconnect the white lead wire and the brown lead wire

from 52C relay.

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

P.C. board.

Terminal block

cover

Indoor electronic

control P.C.board

Terminal block

cover screw

OPERATING PROCEDURE

PHOTOS

3. Removing the electrical box

Photo 3

(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 con-

trol P.C. board.

(5) Unhook the catches (both upper and lower), remove the

electrical box.

Catch

4. Removing the vane motor

(1) Remove the front panel.

Vane motor screw

Photo 4

(2) Remove the screw of the vane motor, disconnect the con-

nector.

(3) Remove the vane motor.

Drain hose

Vane motor

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

(1) Remove the front panel. (Refer to 1)

Photo 5

(2) Disconnect the connector from the vane motor.

(3) Pull out the drain hose from the nozzle assembly, remove

the nozzle assembly.

(4) Lifting the left side of the heat exchanger, remove the elec-

trical box.

(5) Remove the fixture of the fan motor.

(6) Remove the hexagon socket set screws.

(7) Remove the line flow fan and the fan motor.

Fan motor

catches

Indoor coil

termistor

Fan motor

fixture

11-2 MSH-18NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

MSH-24NV -

INDOOR UNIT

OPERATING PROCEDURE

PHOTOS

1. Removing the front panel

Photo 1

(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.

Front panel

Screws

2. Removing the electronic control P.C. board

(1) Remove the front panel. (Refer to 1)

Photo 2

(2) Remove the electrical cover.

(3) Remove the screw, remove the terminal cover.

(4) Remove the screw of terminal block.

(5) Unhook the catch of the lamp holder.

(6) Remove the receiver holder.

(7) Disconnect the connectors and the lead wire from 52C

relay on the electronic control P.C. board and remove the

ground and the indoor coil thermistor.

Ground

Indoor coil thermistor

(8) Remove the electronic control P.C. board.

Screw

Terminal

block

screw

Indoor

electronic

control

P.C. board

OPERATING PROCEDURE

PHOTOS

3. Removing the electrical box

screw

Photo 3

(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 con-

trol P.C. board.

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

cal box.

screw

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

(1) Remove the front panel.

Photo 4

Heat exchanger

(2) Remove the electrical box.

(3) Unhook the catch on the both sides of the nozzle assem-

bly.

(4) Remove the nozzle assembly.

Catch

(5) Remove the screws of the bearing support.

(6) Remove the screw of the heat exchanger unhook the

catch.

Heat exchanger

screw

(7) Lifting the heat exchanger, remove the bearing support.

(8) Remove the motor support.

(9) Loose the screw fixing the line flow fan, remove the line

Bearing support

screws

flow fan.

( )

10 Remove the screws of the motor band, remove the fan

motor.

Photo 5

Indoor fan motor

Fan

motor

screws

Line flow fan

Motor band

11-3 MUH-07NV -

OUTDOOR UNIT

MUH-09NV -

MUH-07NV -

MUH-09NV -

OPERATING PROCEDURE

PHOTOS

1. Removing the cabinet

Photo 1

(1) Remove the top panel.

(2) Remove the cabinet

Photo 2

Service

panel

Screw for

service panel

Screw for

top panel

Screw for

top panel

Screws for

cabinet

Screws for

cabinet

2. Remove the deicer P.C. board

Photo 3

(1) Remove the top panel, the service panel and the cabinet.

(2) Disconnect all the connectors and the terminals on the

deicer P.C. board.

Deicer P.C board

(3) Remove the deicer P.C. board.

3. Removing the propeller fan

Propeller fan

Photo 4

(1) Turn the propeller nut clockwise to remove.

(2) Pull the propeller fan toward you to remove.

Propeller nut

OPERATING PROCEDURE

PHOTOS

4. Removing the outdoor fan motor

(1) Remove the screws securing the outdoor fan motor.

(2) Remove the lead clamps.

Photo 5

Outdoor fan motor set screws

(3) Disconnect the capacitor terminal and wire of the terminal.

(4) Pull out the outdoor fan motor.

Lead

fxture

Outdoor fan motor

5. Removing the compressor

(1) Remove the lead clamps.

Photo 6

(2) Remove the screws securing the relay panel.

(3) Remove the screw securing the service port.

(4) Remove the terminal cover. (See Photo 7.)

(5) Pull out the lead from the compressor terminal.

(6) Remove the overcurrect relay.

(7) Remove the compressor nuts.

(8) Detach the suction pipe welded section and discharge pipe

welded section with a burner.

Relay panel

NOTE

● Before using a burner, purge gas from the pipes until the pres-

sure gauge shows 0 kg/cm².

● Use the burner under the condition that gas can be released

even when the inner pressure rises by heat.

Photo 7

Photo 9

Terminal cover

Compressor

Photo 8

Discharge pipe

Sound proof felt

Compressor nuts

Suction pipe

11-4 MUH-12NV -

MUH-18NV -

MUH-12NV -

MUH-18NV -

OUTDOOR UNIT

OPERATING PROCEDURE

PHOTOS

1. Removing the cabinet

Photo 1

(1) Remove the screws of the cabinet.

(2) Hold the down of the cabinet on the both side to remove

the cabinet.

Photo 2

Screws

Service

panel

Screws

2. Removing the deicer P.C. board

(1) Remove the service panel and the cabinet.

(2) Disconnect all the connectors and the terminals on the

deicer P.C. board.

Photo 3

Screws

Deicer

P.C. board

(3) Remove the deicer P.C. board.

Compressor

Red lead wire

Black lead wire

White lead wire

Terminal

block

OPERATING PROCEDURE

PHOTOS

Photo 4

3. Removing the outdoor fan motor

Set screws for

outdoor fan motor

(1) Remove the cabinet. (Refer to 1)

(2) Disconnect the connector remove the clamp of fan motor

lead wire.

Lead clamps

propeller fan

(3) Remove the propeller nut and remove the propeller.

(4) Remove screws securing the fan motor.

Outdoor

fan motor

Propeller

fan nut

Set screws for

outdoor fan motor

4. Removing the compressor

(1) Remove the cabinet. (Refer to 1)

(2) Remove the soundproof felt.

Photo 5

(3) Remove the terminal cover on the compressor

(4) Remove the electrical assembly.

(Refer to 2)

(5) Release 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.

Terminal cover

Discharge

pipe

Suction

pipe

Compressor

Compressor nuts

11-5 MUH-24NV-

OUTDOOR UNIT

OPERATING PROCEDURE

MUH-24NV-

PHOTOS

1. Removing the electrical parts

Photo 1

( )

1 Remove the screws and the top panel.

( )

Screws

2 Remove the screw of the cover panel. To remove the

cover panel, pull it toward you and unhook the catch-

es from the side panel.

3 Remove the screw of the service panel. To remove the

service panel, pull it down toward you and unhook the

catches on the both sides.

Top panel

( )

Service panel

Panel cover

Front panel

Photo 2

Transformer

Capacitor

Outdoor controller

board

Contactor

Overcurrent

relay

Screws

Terminal block

2. Removing the fan motor

Photo 3

( )

1 Remove the screws of the front panel.

Open the front panel to a 45-degree angle.

Then lift it and unhook the catches to remove.

2 Remove the propeller nut and the propeller fan.

3 Remove the screws and the fan motor.

Disconnect the lead connectors.

Motor support Separator support

Lead

( )

Propeller

fan

connectors

Valve bed

Propeller nut

OPERATING PROCEDURE

PHOTOS

3. Removing the heat exchanger and the compressor

Photo 4

( )

1 Remove the rear panel.Remove the valve bed, and

Screws

open the rear panel to the rear to remove.

NOTE :

All panels are fixed by catches, and must be removed by

shifting up and down.

( )

2 Remove the screws of the right side panel and remove

it.

( )

3 Remove the screws of the rear guard and remove it.

( )

4 Remove the screws of the separator support plate and

remove it.

( )

5 Remove the screws of the motor support and remove

it.

Screws

( )

6 Remove the screws of the valve bed.

The valve bed is fixed by the catches on the right and

left sides.

Lift it to remove.

( )

7 Remove the electrical parts box.

Disconnect the connectors from the high pressure

switch, crank case heater, shell thermo, and fan motor

lead.

( )

8 Remove the screws of the separator and remove it.

( )

9 Remove the screws of the heat exchanger and remove

Photo 5

it.

Heat exchanger

Detach the welded point of pipe.

( )

10 Remove the nuts of the compressor and remove it.

Detach the welded points of the compressor suction

pipe and discharge pipe.

Accumulator

Photo 6

Charge plug

Ball valve

Compressor

12 PARTS LIST

INDOOR UNIT

STRUCTURAL PARTS

MSH-07NV -

MSH-09NV -

MSH-12NV -

MSH-07NV -

MSH-09NV -

MSH-12NV -

(WH)

Optional parts

Symbol

in Wiring

Diagram

Q'ty/unit

NO.

Part No.

Part Name

Remarks

MSH-07NV- E1 MSH-07NV- E2 MSH-09NV- E1 MSH-09NV- E2 MSH-12NV- E1 MSH-12NV- E2

(WH)

E02 154 000 FRONT PANEL(WH)

E02 157 000 FRONT PANEL(WH)

E02 199 000 FRONT PANEL(WH)

E02 151 010 GRILL(WH)

E02 164 100 AIR FILTER

1PC/SET

2PCS/SET

E02 151 234 BOX(WH)

E02 166 234 BOX(WH)

E02 151 970 INSTALLATION PLATE

E02 166 067 SCREW CAP(WH)

INDOOR UNIT

HEAT EXCHANGER

MSH-07NV -

MSH-09NV -

MSH-12NV -

MSH-07NV -

MSH-09NV -

MSH-12NV -

(WH)

Symbol

in Wiring

Diagram

Q'ty/unit

NO.

Part No.

Part Name

Remarks

E1 E2

MSH-07/09NV-

(WH)

MSH-12NV-

(WH)

E02 151 620 INDOOR HEAT EXCHANGER

E02 155 620 INDOOR HEAT EXCHANGER

E02 151 666 UNION(GAS)

{9.52

{12.7

{6.35

E02 155 666 UNION(GAS)

E02 151 667 UNION(LIQUID)

INDOOR UNIT

ELECTRICAL PARTS

MSH-07NV -

MSH-09NV -

MSH-12NV -

MSH-07NV -

MSH-09NV -

MSH-12NV -

(WH)

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

Symbol

Q'ty/unit

in Wiring

Diagram

NO.

Part No.

Part Name

Remarks

MSH-07NV-

(WH)

MSH-09NV-

(WH)

MSH-12NV-

(WH)

E02 166 235 NOZZLE(WH)

E02 166 040 VANE(WH)

E02 141 702 DRAIN HOSE

E02 151 303 VANE MOTOR

E02 151 300 INDOOR FAN MOTOR

E02 151 505 RUBBER MOUNT

E02 151 302 LINE FLOW FAN

E02 151 509 BEARING MOUNT

RC4V19 -

2PCS/SET

ROOM TEMPERATURE THERMISTOR

RT11

RT12

E02 151 308

E02 151 307

E02 198 375

E02 199 450

E02 200 450

E02 201 450

E02 152 395

E02 127 382

E02 085 385

E02 001 504

E02 151 468

E02 199 520

INDOOR COIL THERMISTOR

TERMINAL BLOCK

ELECT CONTROL P.C.BOARD

POWER SUPPLY CORD

FUSE

F11

3.15A

VARISTOR

NR11

SLEEVE BEARING

RECEIVER

FAN GUARD

OUTDOOR UNIT

STRUCTURAL PARTS

MUH-07NV -

MUH-09NV -

MUH-07NV -

MUH-09NV -

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

Symbol

in Wiring

Diagram

Q'ty/unit

NO.

Part No.

Part Name

Remarks

E1 E2

MUH-09NV

MUH-07NV

CABINET

E02 096 232

E02 085 297

E02 199 521

E02 085 245

E02 096 630

E02 128 900

E02 164 900

E02 047 506

E02 096 290

E02 096 662

E02 096 661

E02 085 515

E02 154 642

E02 077 961

E02 154 936

E02 159 936

E02 134 937

E02 199 936

E02 139 936

TOP PANEL

FAN GUARD

SERVICE PANEL

OUTDOOR HEAT EXCHANGER

COMPRESSOR

RH-174VGHT

RH-135VGHT

COMPRESSOR

COMPRESSOR RUBBER SET

BASE

STOP VALVE(LIQUID)

STOP VALVE(GAS)

MOTOR SUPPORT

CHECK VALVE

{6.35

{9.52

REVERSING VALVE

CAPILLARY TUBE

{3.0 ✕{1.6 ✕ 1300

{3.0 ✕{1.4 ✕ 800

{3.0 ✕{1.6 ✕ 400

{3.0 ✕{1.4 ✕ 850

{3.0 ✕{1.6 ✕ 750

OUTDOOR UNIT

FUNCTIONAL PARTS AND ELECTRICAL PARTS

MUH-07NV -

MUH-09NV -

MUH-07NV -

MUH-09NV -

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

Symbol

Q'ty/unit

in Wiring

Diagram

NO.

Part No.

Part Name

Remarks

MUH-07/09NV

E02 085 501 PROPELLER FAN

E02 096 301 OUTDOOR FAN MOTOR

E02 085 353 COMPRESSOR CAPACITOR

E02 199 374 TERMINAL BLOCK

RA6V29-

25+/440VAC

E02 096 310 DEFROST THERMISTOR

E02 199 451 DEICER P.C. BOARD

E02 154 490 REVERSING VALVE COIL

RT61

21S4

OUTDOOR UNIT

STRUCTURAL PARTS

MUH-12NV -

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

Symbol

in Wiring

Diagram

Q'ty/unit

NO.

Part No.

Part Name

Remarks

- ^E1

MUH-12NV

E02 141 521 GRILL

E02 141 232 CABINET ASSEMBLY

E02 140 233 BACK PANEL

E02 141 245 SERVICE PANEL

E02 075 506 COMPRESSOR RUBBER SET

E02 139 515 MOTOR SUPPORT

E02 156 630 OUTDOOR HEAT EXCHANGER

E02 141 900 COMPRESSOR

3 RUBBER

RH-231VHAT

E02 201 290 BASE

E02 139 662 STOP VALVE(LOQUID)

E02 140 661 STOP VALVE(GAS)

E02 077 961 REVERSING VALVE

E02 141 501 PROPELLER FAN

E02 141 301 OUTDOOR FAN MOTOR

E02 079 353 COMPRESSOR CAPACITOR

E02 201 374 TERMINAL BLOCK

E02 139 310 DEFROST THERMISTOR

E02 201 451 DEICER P.C. BOARD

E02 156 490 REVERSING VALVE COIL

E02 156 936 CAPILLARY TUBE

E02 134 937 CAPILLARY TUBE

E02 154 642 CHECK VALVE

{6.35

{12.7

RA6V40 -

30+/440VAC

RT61

21S4

{3.0✕{1.4✕ 500

{3.0✕{1.6✕ 400

INDOOR UNIT

STRUCTURAL PARTS

MSH-18NV -

MSH-24NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

(WH)

Optional parts

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

Symbol

Q'ty/unit

in Wiring

MSH-18NV-

MSH-24NV-

NO.

Part No.

Part Name

Remarks

E2 E3

E1 E2

(WH)

Diagram

FRONT PANEL(WH)

GRILLE(WH)

E02 138 000

E02 138 010

E02 143 234

E02 141 100

E02 141 970

E02 143 067

E02 168 007

E02 214 007

BOX(WH)

AIR FILTER

1PC/SET

INSTALLATION PLATE

SCREW CAP(WH)

LAMP PANEL(WH)

3PCS/SET

INDOOR UNIT

HEAT EXCHANGER PARTS

MSH-18NV -

MSH-24NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

(WH)

Symbol

Q'ty/unit

in Wiring

Diagram

MSH-18NV-

MSH-24NV-

NO.

Part No.

Part Name

Remarks

E1 E2 E3

E1 E2

(WH)

E02 141 620 INDOOR HEAT EXCHANGER

E02 138 667 UNION(LIQUID)

E02 176 667 UNION(LIQUID)

E02 138 666 UNION(GAS)

{6.35

{9.52

{15.88

INDOOR UNIT

ELECTRICAL PARTS

MSH-18NV -

MSH-24NV -

MSH-18NV -

MSH-24NV -

MSH-18NV -

(WH)

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

Symbol

Q'ty/unit

MSH-18NV-

MSH-24NV-

in Wiring

Diagram

NO.

Part No.

Part Name

NOZZLE(WH)

VANE(WH)

Remarks

E2 E3

(WH)

E02 143 235

E02 143 040

E02 141 702

E02 141 300

E02 213 300

E02 001 505

E02 138 395

E02 320 395

E02 139 450

E02 198 450

E02 214 450

E02 141 302

E02 141 303

DRAIN HOSE

RA4V27 -EA

RA4V27 -EC

2PCS/SET

INDOOR FAN MOTOR

RUBBER MOUNT

POWER SUPPLY CORD

ELECT CONTROL P.C. BOARD

LINE FLOW FAN

VANE MOTOR

10 E02 138 329

11 E02 141 509

E02 198 375

12 E02 139 375

E02 278 375

13 E02 085 385

14 E02 141 468

15 E02 001 504

16 E02 138 307

17 E02 138 308

18 E02 127 382

DISPLAY P.C. BOARD

BEARING MOUNT

TERMINAL BLOCK

VARISTOR

NR11

RECEIVER P. C. BOARD

SLEEVE BEARING

INDOOR COIL THERMISTOR RT12

ROOM TEMPERATURE THERMISTOR RT11

3.15A

FUSE

FAN GUARD

F11

E02 138 520

OUTDOOR UNIT

STRUCTURAL PARTS

MUH-18NV -

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

Symbol

Q'ty/unit

in Wiring

Diagram

MUH-18NV-

NO.

Part No.

Part Name

CABINET

Remarks

E02 141 232

E02 141 521

E02 141 245

E02 139 630

E02 139 515

E02 139 900

E02 139 290

E02 144 301

E02 141 501

E02 082 353

E02 004 340

E02 139 374

E02 198 374

E02 139 936

E02 139 937

E02 138 506

E02 139 662

E02 150 661

E02 140 233

E02 095 382

E02 139 451

E02 198 451

E02 139 310

E02 139 490

E02 077 961

E02 128 383

GRILLE

SERVICE PANEL

OUTDOOR HEAT EXCHANGER

MOTOR SUPPORT

COMPRESSOR

NH-36VMDT

RA6V50 -

BASE

OUTDOOR FAN MOTOR

PROPELLER FAN

COMPRESSOR CAPACITOR

CONTACTOR

50+/440V

52C

TERMINAL BLOCK

CAPILLARY TUBE

COMPRESSOR RUBBER SET

STOP VALVE(LIQUID)

STOP VALVE(GAS)

BACK PANEL

{3.0✕{1.6✕750

{3.0✕{2.0✕800

{6.35

{15.88

FUSE

F61

DEICER P.C. BOARD

DEFROST THERMISTOR

REVERSING VALVE COIL

REVERSING VALVE

SURGE ABSORBER

RT61

21S4

DSAR

OUTDOOR UNIT

STRUCTURAL PARTS

MUH-24NV-

19 10 18

14 6

OUTDOOR UNIT

STRUCTURAL PARTS

MUH-24NV-

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

Symbol

Q'ty/unit

in Wiring

MUH-24NV-

NO.

Part No.

Part Name

CABINET

Remarks

Diagram

E02 214 232

E02 214 521

E02 214 245

E02 214 630

E02 214 515

E02 042 900

E02 214 290

E02 214 301

E02 214 501

E02 082 353

E02 010 342

E02 198 374

E02 214 249

E02 138 506

E02 010 662

E02 010 661

E02 214 297

E02 138 351

E02 214 451

E02 214 310

E02 176 936

E02 256 936

E02 262 936

E02 214 522

FAN GUARD

SERVICE PANEL

OUTDOOR HEAT EXCHANGER

MOTOR SUPPORT

COMPRESSOR

NH-47VMDT

RA6V85 -

BASE

OUTDOOR FAN MOTOR

PROPELLER FAN

COMPRESSOR CAPACITOR

CONTACTOR

50+/440VAC

52C1

TERMINAL BLOCK

SIDE PANEL

COMPRESSOR RUBBER SET

STOP VALVE(LIQUID)

STOP VALVE(GAS)

TOP PANEL

{9.52

{15.88

3.0+/440VAC

C11

FAN MOTOR CAPACITOR

DEICER P.C. BOARD

DEFROST THERMISTOR

CAPILLARY TUBE

REAR PANEL

RT61

[3.0✕[1.6✕350

[3.0✕[2.0✕350

[4.0✕[2.4✕200

23 E02 095 382

24 E02 214 381

25 E02 288 343

FUSE

TRS

THERMAL READ SWITCH

FAN MOTOR RELAY

ACCESSORY AND REMOTE CONTROLLER PARTS

MSH-07NV - (WH)

MSH-09NV - (WH)

MSH-12NV - (WH)

MSH-18NV - (WH)

MSH-24NV - (WH)

MSH-07NV - (WH)

MSH-09NV - (WH)

MSH-12NV - (WH)

MSH-18NV - (WH)

MSH-24NV - (WH)

MSH-18NV - (WH)

Symbol

in Wiring

Diagram

Q'ty/unit

NO.

Part No.

Part Name

Remarks

MSH-07/09/12/18/24NV -

(WH)

MSH-18NV -

(WH)

E02 139 426 REMOTE CONTROLLER

E02 141 083 REMOTE CONTROLLER HOLDER

13 OPTIONAL PARTS

1. REFRIGERANT PIPES

The air conditioner has flared connections its indoor and outdoor sides.

Please use the optional extension pipe as follows.

Additional

refrigerant

charge

Pipe size O.D mm (in.)

Model

Part No.

Pipe length

Cross-section

A-Gas

B-Liquid

Insulation

R-22(g)

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

10m

MSH-07NV-

MSH-09NV-

MSH-07NV-

MSH-09NV-

150

9.52 (3/8)

MSH-12NV-

12.7 (1/2)

10m

15m

10m

15m

6.35 (1/4)

150

400

MSH-18NV-

150

400

15.88 (5/8)

MSH-24NV-

9.52 (3/8)

10m

15m

195

520

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 3 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.

Part No.

Model

MSH-07NV-

MSH-09NV-

MSH-12NV-

MSH-18NV-

MSH-24NV-

MSH-18NV-

MSH-07NV-

MSH-09NV-

MSH-12NV-

MAC-1000FT

MAC-1100FT

MSH-24NV-

MSH-18NV-

3. DEODORIZING FILTER

● DEODORIZING FILTER removes ammonia and hydrogen sulphide emitted from tobacco, and odors 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.

Part No.

Model

MSH-07NV-

MSH-09NV-

MSH-12NV-

MSH-18NV-

MSH-24NV-

MSH-18NV-

MSH-07NV-

MSH-09NV-

MSH-12NV-

MSH-24NV-

MSH-18NV-

MAC-1500DF

MAC-1600DF

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

HEAD OFFICE MITSUBISHI DENKI BLDG.MARUNOUCHI TOKYO100 TELEX J24532 CABLE MELCO TOKYO

Issued in Sep. 1997. No.OB207 646

Printed in Japan

New publication, effective Sep. 1997

Specifications subject to change without notice.

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