Mitsubishi Electric MS-18NN Series User manual

SERVICE MANUAL
SPLIT-TYPE, AIR CONDITIONERS
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································5
4. OUTLINES AND DIMENSIONS ·························7
5. WIRING DIAGRAM ············································8
6. REFRIGERANT SYSTEM DIAGRAM··············10
7. PERFORMANCE CURVES······························13
8. MICROPROCESSOR CONTROL ····················15
9. SERVICE FUNCTIONS ····································23
10. TROUBLESHOOTING······································24
11. DISASSEMBLY INSTRUCTIONS·····················30
12. PARTS LIST······················································34
13. OPTIONAL PARTS···········································38
Wireless type
Models
No. OB188
MS-18NN - (WH) · MU-18NN -
MS-24NN - (WH) · MU-24NN - S1S1
S1S1
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2
TECHNICAL CHANGES
MS-18JN- ➔MS-18NN-
1. Indoor unit model and outdoor unit model have changed.
2. Indoor fan motor has changed. (S4N-24B-EA ➔ RA4N30-AA)
3. Outdoor fan motor has changed. (S6M-50F-CB ➔ RA6V50-OD)
4. Compressor has changed. (NHJ-36NBD ➔ NH-28NCDT)
5. The remote controller has changed.
6. Microprocessor control has changed.
1
S1 S1
MS-24JN- ➔MS-24NN-
1. Indoor unit model and outdoor unit model have changed.
2. Indoor fan motor has changed. (S4N-26B-BA ➔ RA4N30-AA)
3. Outdoor fan motor has changed. (S6N-60F-AB ➔ RA6V60-AB)
4. Compressor has changed. (NHJ-38NBD ➔ NH-38NBDT)
5. The remote controller has changed.
6. Microprocessor control has changed.
S1 S1
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3
PART NAMES AND FUNCTIONS
2
INDOOR UNIT

OUTDOOR UNIT
MU-18NN- ,MU-24NN- S1S1
MS-18NN- ,MS-24NN- S1S1
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4
REMOTE CONTROLLER
MS-18NN- ,MS-24NN- S1S1
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5
SPECIFICATION
3
Rating Conditions : SSA 385/386 - Indoor DB29°C WB19°C,Outdoor DB46°C WB24°C
JIS - Indoor DB27°C WB19°C,Outdoor DB35°C WB24°C
Note ✽SSA 385/386 can be applied only to Saudi Arabia.
Model MS-18NN-
Function Cooling
Power supply Single phase 220V 60Hz
S1
W4,200
kcal/h 3,600
Electrical Current A10.7
data Input W2,300
Capacities
Capacity kW 5.1
Capacities Dehumidification
R/h 2.5
Air flow
m3/h 780
Current A8.9
Input W1,910
Power factor % 98
Starting current A 55
Compressor motor current A8.15
Fan motor current A0.75
Coefficient of performance 2.67
Electrical
data
Model —NH-28NCDT
Output W1,200
Width
mm<in.>
1,015 <40>
Indoor unit Height
mm<in.>
320 <12-9/16>
Depth
mm<in.>
190 <7-1/2>
Width
mm<in.>
850 <33-1/2>
Outdoor unit Height
mm<in.>
605 <23-13/16>
Depth
mm<in.>
290 <11-3/8>
Indoor unit kg<lb> 14<31>
Outdoor unit kg<lb> 55<121>
Air direction — 5
Indoor
Fan speed unit
(Hi) Outdoor
unit
Indoor
Fan speed unit
regulator Outdoor
unit
Refrigerant filling
capacity (R-22)
Compressor
Dimensions
Weight
Special
remarks
kg<lb>
1.65 <3.63>
rpm
rpm
1,180
865
1
4
SSA 385/386*
JIS
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6
Rating Conditions : SSA 385/386
- Indoor DB29°C WB19°C,Outdoor DB46°C WB24°C
JIS - Indoor DB27°C WB19°C,Outdoor DB35°C WB24°C
Note ✽SSA 385/386 can be applied only to Saudi Arabia.
Model MS-24NN-
Function Cooling
Power supply Single phase 220V 60Hz
S1
W5,500
kcal/h 4,700
Electrical Current A16.1
data Input W3,500
Capacities
Capacity kW 6.6
Capacities Dehumidification
R/h 3.5
Air flow
m3/h 840
Current A13.5
Input W2,930
Power factor %99
Starting current A56
Compressor motor current A12.58
Fan motor current A0.92
Coefficient of performance 2.25
Electrical
data
Model —NH-38NBDT
Output W1,700
Width mm<in.> 1,015 <40>
Indoor unit Height mm<in.> 320 <12-9/16>
Depth mm<in.> 190 <7-1/2>
Width mm<in.> 850 <33-1/2>
Outdoor unit Height mm<in.> 605 <23-13/16>
Depth mm<in.> 290 <11-3/8>
Indoor unit kg<lb> 14 <31>
Outdoor unit kg<lb> 61 <135>
Air direction — 5
Indoor
Fan speed unit
(Hi) Outdoor
unit
Indoor
Fan speed unit
regulator Outdoor
unit
Refrigerant filling
capacity (R-22)
Compressor
Dimensions
Weight
Special
remarks
kg<lb>
2.15 <4.73>
rpm
rpm
1,260
930
4
2
SSA 385/386*
JIS
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7
OUTLINES AND DIMENSIONS
4
1015
320
775 190 50
56
160
17.5 Power supply cord
Lead to right 2m
Lead to left 1m
Air out
Air in
190 5
Installation plate
438 352
Wall hole [75
3297
274
284
20
217
648
450
450
150
40 60
Indoor unit
4holes
11✕20
Installation plate
Liquid line [8-0.5m
Gas line [12-0.43m
Installation [50 O.D
[28 I.D
Drain hose [16
Insulation [28
350 20
35
248
Air in
Air out
290 310
345
30 Service panel
605
292
20
50 183
500
850 74
157
100
Drainage
3holes [16.2
161
Gas refrigerant
pipe joint
Refrigerant pipe (flared)
[15.88
Liquid refrigerant
pipe joint
Refrigerant pipe (flared)
[6.35(MS-18)
[9.52(MS-24)
30
o
35
o
INDOOR UNIT
OUTDOOR UNIT
If a front side or both side is vacant, an upper side of a unit has only to be vacant 10cm.
If both sides or back
side is vacant. only
to be free 50cm in
front of a unit.
MS-18NN-
MS-24NN- S1
S1
MU-18NN-
MU-24NN- S1
S1
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8
NOTES : 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
4.”❈”shows 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.
INDOOR UNIT
WIRING DIAGRAM
5
TRANS
NR11
HIC1 IC141
DSAR
BRN
GRN/YLW
LD1
REMOTE
CONTROLLER
GRN/YLW
3
BLU
BLU
BLU
DISPLAY
P.C.BOARD
3
CN
102
3
BLU
WHT
F12 2
1CN201
1
33
4
F11
5
MV
151
CN 111
CN RT11
BRN
YLW
RED
GRY
WHT
BLK
RECEIVER
P.C.BOARD
BLU
112
CN
121
CN
RT12
2
BRN
101
CN
52C CN211
C11
1
2
4
ELECTRONIC CONTROL P.C BOARD
TB
N
LBRN
TO OUTDOOR
UNIT
CONNECTING
MF
POWER SUPPLY
CORD
1[220V
60Hz
❈
❈
❈
❈
❈
TRANS
NR11
HIC1 IC141
1
DSAR
GRN/YLW
WHT WHT
LD1
REMOTE
CONTROLLER
3
3
BLU
BLU
BLU
DISPLAY
P.C.BOARD
CN
102
3
WHT F12 2
1CN201
1
33
4
F11
5
MV
151
CN 111
CN RT11
BRN
YLW
RED
GRY
WHT
BLK
RECEIVER
P.C.BOARD
BLU
112
CN
121
CN
RT12
2
101
CN
52C CN211
C11
1
2
4
ELECTRONIC CONTROL P.C BOARD
TB
GRN/YLW
N
3RED
TO OUTDOOR
UNIT
CONNECTING
MF
POWER SUPPLY
CORD
1[220V
60Hz
SYMBOL NAME SYMBOL NAME SYMBOL NAME
C11 INDOOR FAN MF INDOOR FAN MOTOR TB TERMINAL BLOCK
DSAR SURGE ABSORBER MV VANE MOTOR IC141 HYBRID IC
F11 FUSE(3.15A) 52C COMPRESSOR CONTACTOR NR11 VARISTOR
F12 FUSE(93°C) RT11 ROOM TEMPERATURE THERMISTOR
HIC1 DC/DC CONVERTER RT12 INDOOR COIL THERMISTOR
MS-18NN- S1 MODEL MS-18NN - WIRING DIAGRAM
S1
MS-24NN- S1 MODEL MS-24NN - WIRING DIAGRAM
S1
11Side the sleeve.
22Pull the wire while
pushing the locking lever.
❈
❈
❈❈
❈
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9
NOTES : 1.Use copper conductors only. (For field wiring)
2.”❈”shows 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
OUTDOOR UNIT
TB GRN/YLW
2
N
TO INDOOR
UNIT
CONNECTING
WHT C
MC R
S
RED
BLK
BLK C1
MF
BLK
WHT
ORN
RED
BLK
WHT
ORN
RED
C2
4
3
2
1
6
5
4
3
2
1
GRY
REDCR
5
GRN/YLW
26F1
X1
BLK
GRY
GRY
BLK
YLW
WHT
52C
52C
6
1
43
65
X1 78
b
a52C
RED
3
N
WHT
YLW
52C
1
2
TB
2C
RS
BLK RED
C1
MC
3
RED
ORN
WHT
BLK
YLW
RED
ORN
WHT
BLK
YLW
C2 MF
TO INDOOR
UNIT
CONNECTING
11Side the sleeve.
22Pull the wire while
pushing the locking lever.
❈
❈
❈
❈
❈
SYMBOL NAME SYMBOL NAME SYMBOL NAME
COMPRESSOR OUTDOOR FAN MOTOR THERMAL REED
CAPACITOR (INNER THERMOSTAT) SWITCH
OUTDOOR FAN
CAPACITOR
COMPRESSOR FAN MOTOR SURGE
(INNER THERMOSTAT) RELAY ABSORBER
C1
MF
26F1
C2
TB
52C
MC
X1
CR
TERMINAL BLOCK
CONTACTOR
SYMBOL NAME SYMBOL NAME
COMPRESSOR FAN MOTOR
CAPACITOR (INNER THERMOSTAT)
FAN MOTOR
CAPACITOR
COMPRESSOR
(INNER THERMOSTAT)
C1
MF
C2
TB
MC
TERMINAL BLOCK
MU-18NN- S1 MODEL MU-18NN - WIRING DIAGRAM
S1
MU-24NN- S1 MODEL MU-24NN - WIRING DIAGRAM
S1
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10
Indoor heat
exchanger
RT11
Room
temperature
thermistor Flared
connector
Flared
connector
Refrigerant pipe
(Option)[6.35
(with heat insulator)
Refrigerant pipe
(Option) [15.88
(with heat insulator)
Stop Valve 2.0 700
1.4 650
DISCHARGE
PRESSURE
REGULATOR
STRAINER
Flow of refrigerant
Compressor
ACCUMULATOR
Stop valve
(With service port)
Indoor coil
thermistor
RT12 Outdoor
heat
exchanger
[
[
REFRIGERANT SYSTEM DIAGRAM
6
INDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
OUTDOOR UNIT
Indoor heat
exchanger
RT11
Room
temperature
thermistor Flared
connector
Flared
connector
Refrigerant pipe
(Option) 9.52
(with heat insulator)
Refrigerant pipe
(Option) 15.88
(with heat insulator)
Stop Valve 2.0 600
1.6 350
DISCHARGE
PRESSURE
REGULATOR
STRAINER
2.0 100
Flow of refrigerant
Compressor
ACCUMULATOR
Stop valve
(With service port)
Indoor coil
thermistor
RT12 Outdoor
heat
exchanger
[
[
[[
[
Umit:mm
Umit:mm
MS-18NN - S1 MU-18NN - S1
MS-24NN - S1 MU-24NN - S1
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