Mitsubishi Electric MSH-07NV User manual

SERVICE MANUAL
SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS
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
Wireless type
Models
MSH-07NV - (WH) · MUH-07NV -
MSH-09NV - (WH) · MUH-09NV -
MSH-12NV - (WH) · MUH-12NV -
MSH-18NV - (WH) · MUH-18NV -
MSH-24NV - (WH) · MUH-24NV -
MSH-07NV - (WH) · MUH-07NV -
MSH-09NV - (WH) · MUH-09NV -
MSH-12NV - (WH) · MUH-12NV -
MSH-18NV - (WH) · MUH-18NV -
MSH-24NV - (WH) · MUH-24NV -
MSH-18NV - (WH) · MUH-18NV -
E3E3
E2E2
E2E2
E2E2
E2E2
E2E2
E1E1
E1E1
E1E1
E1E1
E1E1
No. OB207
MSH-18NV -
MSH-18NV -
MSH-18NV - E3
E2
E1
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.
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
E3E2E1
OB207t-1qxp 25/9/97 8:51 PM Page 1

2
TECHNICAL CHANGES
MSH-17NV - ➔MSH-07NV -
1. Indoor electronic control P.C.board has changed.
However, it is compatible between and models.
2. Auto restart function is added.
MSH-09NV - ➔MSH-09NV -
1. Indoor electronic control P.C.board has changed.
However, it is compatible between and models.
2. Auto restart function is added.
MSH-12NV - ➔MSH-12NV -
1. Indoor electronic control P.C.board has changed.
However, it is compatible between and models.
2. Auto restart function is added.
MSH-18NV - ➔MSH-18NV -
1. Indoor electronic control P.C.board has changed.
However, it is compatible between and models.
2. Auto restart function is added.
MSH-24NV - ➔MSH-24NV -
1. Indoor electronic control P.C.board has changed.
However, it is compatible between and models.
2. Auto restart function is added.
E2E1
E2E1
E3E2
E3E2
E2E1
E2E1
E2E1
E2E1
E2E1
E2E1
1
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3
PART NAMES AND FUNCTIONS
2
INDOOR UNIT
MSH-07NV - MSH-07NV -
MSH-09NV - MSH-09NV -
MSH-12NV - MSH-12NV - E2
E1
E2
E1
E2
E1






OUTDOOR UNIT
MUH-12NV -
MUH-18NV -
MUH-18NV -
MUH-18NV - E3
E2
E1
E1 MUH-24NV -
MUH-24NV - E2
E1
MUH-07NV -
MUH-09NV -
MUH-07NV -
MUH-09NV - E2
E2
E1
E1
(When the front panel is open)
MSH-07NV - MSH-09NV - MSH-12NV -
MSH-07NV - MSH-09NV - MSH-12NV - E2E2E2
E1E1E1
MSH-18NV - MSH-24NV - MSH-18NV -
MSH-24NV - MSH-18NV - E3E2
E2E1E1
MSH-18NV - MSH-24NV - MSH-18NV -
MSH-24NV - MSH-18NV - E3E2
E2E1E1
MSH-18NV -
MSH-24NV -
MSH-18NV -
MSH-24NV -
MSH-18NV - E3
E2
E2
E1
E1
MSH-07NV - MSH-09NV - MSH-12NV -
MSH-07NV - MSH-09NV - MSH-12NV - E2E2E2
E1E1E1
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4
REMOTE CONTROLLER
MSH-07NV - MSH-09NV - MSH-12NV - MSH-18NV - MSH-18NV - E2E1E1E1E1
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5
MSH-07NV - (Serial number 7000201T~) MSH-09NV - (Serial number 7000201T~)
MSH-12NV - (Serial number 7000001T~) MSH-24NV -
MSH-07NV - MSH-09NV -
MSH-12NV - MSH-18NV - (Serial number 7000001T~)
MSH-24NV - MSH-18NV - E3E2
E2E2
E2E2
E1E1
E1E1
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6
SPECIFICATION
3
Capacity
Electrical data
Compressor
Indoor
fan motor
Outdoor
fan motor
Dimensions
Weight
Special remarks
Model
Function
Power supply
Coefficient of performance(C.O.P)
Capacity
Dehumidification
Air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding resistance(at20:)
Model
Winding resistance(at20:)
Model
Winding resistance(at20:)
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Air direction
Sound level
(Hi)
Fan speed
(Hi)
Fan speed
regulator
Refrigerant filling capacity(R-22)
Thermistor
Width
Height
Depth
Width
Height
Depth
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
RT11(at25:)
RT12(at25:)
RT61(at0:)
kW
R/h
K /h
A
A
W
A(kW)
%
A
A
A
W
"
"

"
mm
mm
mm
mm
mm
mm
kg
kg
dB
dB
rpm
rpm
kg
k"
k"
k"
MSH-07NV - E1 E2
Single phase,220-240V,50Hz
INDOOR 492 OUTDOOR 1620
10
98-98
25
INDOOR 0.17 OUTDOOR 0.33
RH-135VGHT
650
C-R4.17 C-S5.75
RC4V19-AA
WHT-BLK292 BLK-RED324
RA6V29-CB
WHT-BLK218.0 BLK-RED423.7
815
275
183
780
540
255
8
34
5
37
47
1,100
790-820
4
1
0.85
10
10
33.18
MSH-09NV - E1 E2
Single phase,220-240V,50Hz
INDOOR 492 OUTDOOR 1620
10
25
INDOOR 0.17 OUTDOOR 0.33
RH-174VGHT
800
C-R3.26 C-S5.82
RC4V19-AA
WHT-BLK292 BLK-RED324
RA6V29-CB
WHT-BLK218.0 BLK-RED423.7
815
275
183
780
540
255
8
34
5
37
48
1,100
790-820
4
1
0.85
10
10
33.18
Cooling
2.2
0.8
3.30-3.20
710-750
—
2.80-2.70
3.10-2.93
Heating
2.5
—
3.15-3.05
680-720
—
2.65-2.55
3.68-3.47
Cooling
2.5
1.1
4.10-4.00
880-920
—
98-96
3.60-3.50
2.84-2.72
Heating
3.1
—
4.30-4.10
920-940
—
97-96
3.80-3.60
3.37-3.30
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
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7
Capacity
Electrical data
Compressor
Indoor
fan motor
Outdoor
fan motor
Dimensions
Weight
Special remarks
Model
Function
Power supply
Coefficient of performance(C.O.P)
Capacity
Dehumidification
Air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding resistance(at20:)
Model
Winding resistance(at20:)
Model
Winding resistance(at20:)
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Air direction
Sound level
(Hi)
Fan speed
(Hi)
Fan speed
regulator
Refrigerant filling capacity(R-22)
Thermistor
Width
Height
Depth
Width
Height
Depth
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
RT11(at25:)
RT12(at25:)
RT61(at0:)
kW
R/h
K /h
A
A
W
A(kW)
%
A
A
A
W
"
"

"
mm
mm
mm
mm
mm
mm
kg
kg
dB
dB
rpm
rpm
kg
k"
k"
k"
MSH-12NV - E1 E2
Single phase,220-240V,50Hz
INDOOR 558 OUTDOOR 2130-2244
10
35
INDOOR 0.17 OUTDOOR 0.37
RH-231VHAT
1100
C-R2.1 C-S3.9
RC4V19-AA
WHT-BLK292 BLK-RED324
RA6V40-EC or EE
WHT-BLK130 BLK-RED134.6
815
275
183
850
605
290
8
43
5
42
50
1230
780-820
4
1
1.15
10
10
33.18
MSH-18NV - E1 E2 E3
Single phase,220-240V,50Hz
INDOOR 756 OUTDOOR 2142
15
52-58
INDOOR 0.25 OUTDOOR 0.39
NH-36VMDT
1700
C-R1.2 C-S2.7
RA4V27-EA
WHT-BLK183.8 BLK-RED250.5
RA6V50-OD or OF
WHT-BLK116.4 BLK-RED111.0
1015
320
190
850
605
290
14
59
5
42
52
1180
810-845
4
1
1.8
10
10
33.18
Cooling
3.4
1.6
5.75-5.90
1220-1300
—
96-92
5.21-5.36
2.78-2.61
Heating
4.0
—
5.95-6.10
1260-1350
—
96-92
5.41-5.56
3.17-2.96
Cooling
5.1
2.5
9.4-9.2
2030-2120
—
98-96
8.76-8.56
2.51-2.41
Heating
5.4
—
9.2-9.0
1980-2070
—
98-96
8.56-8.36
2.73-2.61
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
OB207t-1qxp 25/9/97 8:51 PM Page 7

8
Capacity
Electrical data
Compressor
Indoor
fan motor
Outdoor
fan motor
Dimensions
Weight
Special remarks
Model
Function
Power supply
Coefficient of performance(C.O.P)
Capacity
Dehumidification
Air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding resistance(at20:)
Model
Winding resistance(at20:)
Model
Winding resistance(at20:)
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Air direction
Sound level
(Hi)
Fan speed
(Hi)
Fan speed
regulator
Refrigerant filling capacity(R-22)
Thermistor
Width
Height
Depth
Width
Height
Depth
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
RT11(at25:)
RT12(at25:)
RT61(at0:)
kW
R/h
K /h
A
A
W
A(kW)
%
A
A
A
W
"
"

"
mm
mm
mm
mm
mm
mm
kg
kg
dB
dB
rpm
rpm
kg
k"
k"
k"
MSH-24NV - E1 E2
Cooling Heating
Single phase,220-240V,50Hz
6.0 6.2
3.1 —
816
25
12.6-11.7 11.5-11.0
2720-2750 2470-2580
—
98
59
11.73-10.83 10.63-10.13
INDOOR 0.29 OUTDOOR 0.58
2.21-2.18 2.51-2.40
NH-47VMDT
2200
C-R 0.96 C-S 2.07
RA4V27-EC
WHT-BLK183.8 BLK-RED250.5
RA6V85-AA
WHT-BLK62.7 BLK-YLW30.2 YLW-RED62.9
1015
320
190
870
850
295
14
72
5
45
53
1,260
720-750
4
2
2.4
10
10
33.18
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
OB207t-1qxp 25/9/97 8:51 PM Page 8

9
Capacity
Electrical data
Compressor
Indoor
fan motor
Outdoor
fan motor
Dimensions
Weight
Special remarks
Model
Function
Power supply
Coefficient of performance(C.O.P)
Capacity
Dehumidification
Air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding resistance(at20:)
Model
Winding resistance(at20:)
Model
Winding resistance(at20:)
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Air direction
Sound level
(Hi)
Fan speed
(Hi)
Fan speed
regulator
Refrigerant filling capacity(R-22)
Thermistor
Width
Height
Depth
Width
Height
Depth
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
RT11(at25:)
RT12(at25:)
RT61(at0:)
kW
R/h
K /h
A
A
W
A(kW)
%
A
A
A
W
"
"

"
mm
mm
mm
mm
mm
mm
kg
kg
dB
dB
rpm
rpm
kg
k"
k"
k"
MSH-07NV- (INDOOR UNIT)
Cooling Heating
Single phase,220-240V,50Hz
— —
— —
492
10
0.17
35
—
94-86
—
—
0.17
—
—
—
—
RC4V19-AA
WHT-BLK292 BLK-RED324
—
—
815
275
183
—
—
—
8
—
5
37
—
1,100
—
4
—
—
10
10
—
MSH-09NV- (INDOOR UNIT)
Cooling Heating
Single phase,220-240V,50Hz
— —
— —
492
10
0.17
35
—
94-86
—
—
0.17
—
—
—
—
RC4V19-AA
WHT-BLK292 BLK-RED324
—
—
815
275
183
—
—
—
8
—
5
37
—
1,100
—
4
—
—
10
10
—
E1 E2 E1 E2
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
E3E2E1
OB207t-1qxp 25/9/97 8:51 PM Page 9

10
Capacity
Electrical data
Compressor
Indoor
fan motor
Outdoor
fan motor
Dimensions
Weight
Special remarks
Model
Function
Power supply
Coefficient of performance(C.O.P)
Capacity
Dehumidification
Air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding resistance(at20:)
Model
Winding resistance(at20:)
Model
Winding resistance(at20:)
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Air direction
Sound level
(Hi)
Fan speed
(Hi)
Fan speed
regulator
Refrigerant filling capacity(R-22)
Thermistor
Width
Height
Depth
Width
Height
Depth
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Outdoor unit
RT11(at25:)
RT12(at25:)
RT61(at0:)
kW
R/h
K /h
A
A
W
A(kW)
%
A
A
A
W
"
"

"
mm
mm
mm
mm
mm
mm
kg
kg
dB
dB
rpm
rpm
kg
k"
k"
k"
MSH-12NV- (INDOOR UNIT)
Cooling Heating
Single phase,220-240V,50Hz
— —
—
558
10
0.17
35
—
94-86
—
—
0.17
—
—
—
—
RA4V19-AA
WHT-BLK292 BLK-RED324
—
—
815
275
183
—
—
—
8
—
5
42
—
1,230
—
4
—
—
10
10
—
MSH-18NV- (INDOOR UNIT)
Cooling Heating
Single phase,220-240V,50Hz
— —
—
756
10
0.28
60
—
97-89
—
—
0.25
—
—
—
—
RA4V27-EA
WHT-BLK184 BLK-RED251
—
—
1015
320
190
—
—
—
14
—
5
42
—
1,180
—
4
—
—
10
10
—
Please refer to Service manual OB185 for capacity.
E1 E2 E2 E3
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
E3E2E1
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11
OUTLINES AND DIMENSIONS
4
MSH-07NV - MSH-09NV - MSH-07NV - MSH-09NV - E2E2E1E1
MUH-07NV - MUH-09NV - MUH-07NV - MUH-09NV - E2E2E1E1
INDOOR UNIT
OUTDOOR UNIT
Unit: mm
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12
MSH-12NV - MSH-12NV - E2E1
MUH-12NV - MUH-12NV - E2E1
INDOOR UNIT
OUTDOOR UNIT
9.52
If the right/left sides or
back side is vacant,the
front has only to be 50cm
unobstructed.
If the front or right/left sides
are vacant, the top has only
to be 10cm unobstructed.
Unit: mm
OB207t-1qxp 25/9/97 8:51 PM Page 12

OUTDOOR UNIT
13
MSH-18NV - MSH-24NV - MSH-18NV - MSH-24NV - MSH-18NV - E3E2E2E1E1
MUH-18NV - MUH-18NV - MUH-18NV - E3E2E1
INDOOR UNIT
33297297
450450
450450
352352438438
254254
2020
6060
4040
150150 648648 217217
55190190
995995
1901907757755050
320320
10151015
17.517.5
160160
5656
4holes 14holes 111✕✕2020 Indoor unitIndoor unit
Installation plateInstallation plate
Power supply cordPower supply cord
Lead to right 2mLead to right 2m
Lead to left 1mLead to left 1m
WWall holeall hole [[7575
Installation plateInstallation plate
Liquid lineLiquid line [[8-0.5m8-0.5m
Gas lineGas line [[12-0.43m12-0.43m
InsulationInsulation [[50 O.D50 O.D
[[28 I.D28 I.D
InsulationInsulation [[2828
Drain hoseDrain hose [[1616
Air outAir out
{
Air inAir in
If the right/left sides or
back side is vacant,the
front has only to be 50cm
unobstructed.
If the front or right/left sides
are vacant, the top has only
to be 10cm unobstructed.
Unit: mm
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14
MUH-24NV- MUH-24NV- Unit : mm (inch)
E2E1
100 10
1000For 10 units or less
200
Outdoor Unit-Necessary surrounding clearance (Concentrated installation) The upper side must be open.
Outdoor Unit-Necessary surrounding clearance
200
10
10
10Note:Allow adequate
upper clearance
150
500
500 Service space
Front opening
Handle for moving
138
95 Rear piping hole
23
33
Rear fresh air intake
Side air intake
7 24(1)295(11-5/8)
Outlet guide installation hole
302
Air intake
Air intake
Air outlet
870(34-1/4)
185
(7-9/32) 185
(7-9/32)
500(19-11/16)
330(13)
362(14-1/4) 1715 39.5 27.5
Terminal block for indoor and outdoor unit connection
Terminal block for power line
Handle for moving
179 524
441
337
352
403
553
850(33-7/16)
40 60524
Service panel
Ground terminal
Refrigerant-pipe flared connection [15.88 5/8F Refrigerant-pipe flared connection [9.52 3/8F
Knock out hole for front piping (refrigerant,drainage and wiring)
Knock out hole for right piping (refrigerant,drainage and wiring)
R20
R20
60
120
4553
25 max.
Knock out holes for power line 2-[27
Standard bolt length
65
Front right piping holes- detail figures
80
17
42
45
12
R6
104 33
Bottom piping hole
2-U-shaped notched holes
Drain hole
Drain hole
2-12✕23 Oval holes (standard bolt M10)
Handle for moving
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15
WIRING DIAGRAM
5
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
MSH-07NV -
MSH-09NV - E1
E1 MODELS WIRING DIAGRAM
MUH-07NV -
MUH-09NV - E1
E1 MODELS WIRING DIAGRAM
OUTDOOR UNIT
SYMBOL
TB
MV
SR11
SYMBOL
NR11
RT11
RT12
52C
SYMBOL
C11
F12
F11
MF
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE(93:)
FUSE(3.15A)
INDOOR FAN MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
CONTACTOR
TERMINAL BLOCK
VANE MOTOR
SOLID STATE RELAY
SYMBOL
X62
21S4
IC881
SYMBOL
MF
NR61
RT61
SR61
TB
SYMBOL
C1
C65
52C
F61
MC
NAME NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN MOTOR CAPACITOR
CONTACTOR
FUSE(2A)
COMPRESSOR(INNER THERMOSTAT)
OUTDOOR FAN MOTOR
VARISTOR
DEFROST THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
REVERSING VALVE COIL RELAY
REVERSING VALVE COIL
DC/DC CONVERTER
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
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.
1.Slide the sleeve.
2.Pull the wire while
pushing the locking
lever.
❈
❈
❈
❈
❈
❈
~/N
~
TO OUTDOOR
UNIT
CONNECTING
12VDC
L
3
2
N
;
FOR MULTI SYSTEM
INDOOR UNIT
❈
❈
❈❈
❈
❈
❈
OB207t-1qxp 25/9/97 8:52 PM Page 15

16
MSH-12NV - E1
MUH-12NV - E1
MODEL WIRING DIAGRAM
MODEL WIRING DIAGRAM
INDOOR UNIT
OUTDOOR UNIT
❈
❈
❈
❈
❈
❈
~/N
~
TO OUTDOOR
UNIT
CONNECTING
12VDC
L
3
2
N
;
FOR MULTI SYSTEM
SYMBOL
TB
MV
SR11
SYMBOL
NR11
RT11
RT12
52C
SYMBOL
C11
F12
F11
MF
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE(93:)
FUSE(3.15A)
INDOOR FAN MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
CONTACTOR
TERMINAL BLOCK
VANE MOTOR
SOLID STATE RELAY
❈
❈
❈❈
❈ ❈
SYMBOL
X62
21S4
IC881
SYMBOL
MF
NR61
RT61
SR61
TB
SYMBOL
C1
C65
52C
F61
MC
NAME NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN MOTOR CAPACITOR
CONTACTOR
FUSE(2A)
COMPRESSOR(INNER THERMOSTAT)
OUTDOOR FAN MOTOR
VARISTOR
DEFROST THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
REVERSING VALVE COIL RELAY
REVERSING VALVE COIL
DC/DC CONVERTER
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
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.
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
1.Slide the sleeve.
2.Pull the wire while
pushing the locking
lever.
OB207t-1qxp 25/9/97 8:52 PM Page 16

17
MSH-18NV - E1
MUH-18NV - E1
MODEL WIRING DIAGRAM
MODEL WIRING DIAGRAM
INDOOR UNIT
OUTDOOR UNIT
❈
❈
❈❈
❈
❈
SYMBOL
TB
DSAR
HIC1
SYMBOL
NR11
RT11
RT12
IC141
52C
SYMBOL
C11
F12
F11
MF
MV
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE(93:)
FUSE(3.15A)
INDOOR FAN MOTOR
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
HYBRID IC
CONTACTOR
TERMINAL BLOCK
SURGE ABSORBER
DC/DC CONVERTER
❈
❈
❈
❈
❈
SYMBOL
X62
21S4
52C
SYMBOL
MF
NR61
RT61
SR61
TB
SYMBOL
C1
C65
DSAR
F61
MC
NAME NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN MOTOR CAPACITOR
SURGE ABSORBER
FUSE(2A)
COMPRESSOR<INNER THERMOSTAT>
OUTDOOR FAN MOTOR
VARISTOR
DEFROST THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
REVERSING VALVE COIL RELAY
REVERSING VALVE COIL
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
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
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.
1.Slide the sleeve.
2.Pull the wire while
pushing the locking
lever.
OB207t-1qxp 25/9/97 8:52 PM Page 17

18
MSH-24NV - E1
MUH-24NV - E1
MODEL WIRING DIAGRAM
MODEL WIRING DIAGRAM
INDOOR UNIT
OUTDOOR UNIT
NF
WHT
BLU
BLU
4
3
1
2111
CN
52C
CIRCUIT BREAKER
RT12
IC141 112
CN
HIC1
NR11
TRANS
220-240V~
WHT
220-240V~
REMOTE
CONTROLLER
3
1
DISPLAY
P.C.BOARD
101
CN 102
CN 151
CN ELECTRONIC CONTROL P.C BOARD
4
2
1
C11
CN211
BLU
RECEIVER
P.C.BOARD
BLK
WHT
GRY
RED
RT11
MV
F11
3 3
MF
3
121
CN
50Hz
~/N 220-240V
CORD
POWER
SUPPLY
TO OUTDOOR
UNIT
CONNECTING
RED
3
GRN/YLW
TB
BRN YLW
BRN
4
3
CN201
F12
BLU
5
N
2
L
❈
❈
❈
❈
SYMBOL
TB
HIC1
NF
SYMBOL
NR11
RT11
RT12
IC141
52C
SYMBOL
C11
F12
F11
MF
MV
NAME NAME NAME
INDOOR FAN MOTOR CAPACITOR
FUSE(93:)
FUSE(3.15A)
INDOOR FAN MOTOR
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
HYBRID IC
CONTACTOR
TERMINAL BLOCK
DC/DC CONVERTER
NOISE FILTER
ORN WHT
YLW
VLT
TB2
CR
WHT
52C1
RED
ORN
WHT
BLK
YLW
220-240V~
12VDC
DSAR
BLU
TB
GRN/YLW
RED
N
UNIT TO INDOOR
CONNECTING
WHT RED BLU 7
8
RED
VLT
BLU 26F1 X1
WHT
1X1
5
3
YLW
2
1
BLK
WHT
ORN
RED 3
4
5
6
MF C2
WHT
WHT CZ
BRN
4
❈
❈
❈❈
❈❈
3
2F
12
52C1
TAB20
52C
3
YLW
WHT
C1
CN730
2
1
3
F61 SR61
X62
NR61
TRANS
IC881
RED
BLK SCR
MC
BLK
CN721
BLK
21S4
DEICER
P.C. BOARD
CN711 CN661
123
RT61
4
SYMBOL
X62
21S4
52C
52C1
X1
SYMBOL
MF
NR61
RT61
SR61
TB. TB2
SYMBOL
C1
C2
DSAR
F61
MC
NAME NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN MOTOR CAPACITOR
SURGE ABSORBER 1
FUSE(2A)
COMPRESSOR<INNER THERMOSTAT>
OUTDOOR FAN MOTOR
VARISTOR
DEFROST THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
REVERSING VALVE COIL RELAY
REVERSING VALVE COIL
CONTACTOR
COMPRESSOR CONTACTOR
FAN MOTOR RELAY
SYMBOL
F
26F1
IC881
CR
CZ
NAME
FUSE(2A)
THERMOSTAT (AIR FLOW CONTROL)
DC/DC CONVERTER
SURGE ABSORBER 2
SURGE ABSORBER 3
<INNER THERMOSTAT>
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
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
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.
1.Slide the sleeve.
2.Pull the wire while
pushing the locking
lever.
OB207t-1qxp 25/9/97 8:52 PM Page 18

19
MSH-07NV - MSH-09NV - MSH-12NV - E2E2E2
MUH-07NV - MUH-09NV - E2E2
MODELS WIRING DIAGRAM
MODELS WIRING DIAGRAM
INDOOR UNIT
OUTDOOR UNIT
CIRCUIT BREAKER
GUARD
PLATE
FOR MULTI SYSTEM
TO OUTDOOR
UNIT
CONNECTING
12VDC
TB
F12
MV
POWER MONITOR,
RECEIVER
P.C.BOARD
REMOTE
CONTROLLER
POWER
SUPPLY
CORD
~/N 220-240V
50Hz
TO OUTDOOR
UNIT
CONNECTING
12VDC
220-240V~ 52C
N
2
3
L
2
N
L
1
2
1
2
3
LD101
1122
CN
55
151
CN
CN201 3
4
GRN/YLW
GRN/YLW
BLU
WHT
BLU
BLU
BLU
BLU
BRN RED
BRN
NR11
TRANS
HIC1 SR11
C11
F11
ELECTRONIC CONTROL P.C BOARD
3
2
1
CN211
CN
112
111
CN
3
CN
121
RT12
RT11
MF
6
5
4
3
2
1
RED
WHT
BLK
BRN
GRY
YLW
3
❈
❈
❈❈
❈
❈
SYMBOL
TB
HIC1
SR11
MV
SYMBOL
NR11
RT11
RT12
52C
SYMBOL
C11
F12
F11
MF
NAME NAME NAME
INDOOR FAN MOTOR CAPACITOR
FUSE(93:)
FUSE(3.15A)
INDOOR FAN MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
CONTACTOR
TERMINAL BLOCK
DC/DC CONVERTER
SOLID STATE RELAY
VANE MOTOR
220-240V~
12VDC
3
4
IC881
TRANS
TB
WHT
BLK
RED
MF
N4
3
2
1
RT61
CN730
F61 SR61
GRN/YLW
WHT
2
3
TO INDOOR UNIT CONNECTING
R
S
C
WHT
RED
BLK
BLU C1
52C
MC
21S4
1
BLK BLK
CN721
X62
X62
C65
TAB20
NR61
CN661
RED
BLU
CN711
DEICER P.C. BOARD
❈
❈❈
❈
❈
❈
❈
SYMBOL
X62
21S4
52C
SYMBOL
MF
NR61
RT61
SYMBOL
C1
F61
MC
SR61
NAME NAME NAME
COMPRESSOR CAPACITOR
FUSE(2A)
COMPRESSOR<INNER THERMOSTAT>
SOLID STATE RELAY
OUTDOOR FAN MOTOR
VARISTOR
DEFROST THERMISTOR
REVERSING VALVE COIL RELAY
REVERSING VALVE COIL
CONTACTOR
SYMBOL
C65
IC881
TB
NAME
FAN MOTOR CAPACITOR
DC/DC CONVERTER
TERMINAL BLOCK
<INNER THERMOSTAT>
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
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
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.
1.Slide the sleeve.
2.Pull the wire while
pushing the locking
lever.
OB207t-1qxp 25/9/97 8:52 PM Page 19