Mitsubishi Electric MS-18NN, MU-18NN, MS-24NN, MU-24NN, MS-18NN-S1 Service Manual
...
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
No. OB188
MS-18NN MS-24NN -
(WH)
(WH)
· MU-18NN -
· MU-24NN -
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
S1S1
S1S1
1
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.
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
S1 S1
2
2
PART NAMES AND FUNCTIONS
INDOOR UNIT
MS-18NN-
MS-24NN-
,
S1S1
OUTDOOR UNIT
MU-18NN-
MU-24NN-
,
S1S1
3
REMOTE CONTROLLER
MS-18NN-
MS-24NN-
,
S1S1
4
3
Model MS-18NN-
Function Cooling
Power supply Single phase 220V 60Hz
S1
W 4,200
kcal/h 3,600
Electrical Current A 10.7
data Input W 2,300
Capacities
Capacity kW 5.1
Capacities Dehumidification
R/h
2.5
Air flow
m3/h
780
Current A 8.9
Input W 1,910
Power factor % 98
Starting current A 55
Compressor motor current A 8.15
Fan motor current A 0.75
Coefficient of performance 2.67
Electrical
data
Model — NH-28NCDT
Output W 1,200
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
86514
SPECIFICATION
SSA 385/386*
JIS
Rating Conditions : SSA 385/386-Indoor DB29°C WB19°C,Outdoor DB46°C WB24°C
Note ✽ SSA 385/386 can be applied only to Saudi Arabia.
JIS-Indoor DB27°C WB19°C,Outdoor DB35°C WB24°C
5
Model MS-24NN-
Function Cooling
Power supply Single phase 220V 60Hz
S1
W 5,500
kcal/h 4,700
Electrical Current A 16.1
data Input W 3,500
Capacities
Capacity kW 6.6
Capacities Dehumidification
R/h
3.5
Air flow
m3/h
840
Current A 13.5
Input W 2,930
Power factor % 99
Starting current A 56
Compressor motor current A 12.58
Fan motor current A 0.92
Coefficient of performance 2.25
Electrical
data
Model — NH-38NBDT
Output W 1,700
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
93042
SSA 385/386*
JIS
Rating Conditions : SSA 385/386
JIS-Indoor DB27°C WB19°C,Outdoor DB35°C WB24°C
Note ✽ SSA 385/386 can be applied only to Saudi Arabia.
6
-
Indoor DB29°C WB19°C,Outdoor DB46°C WB24°C
4
OUTLINES AND DIMENSIONS
INDOOR UNIT
MS-18NNMS-24NN-
150
S1
S1
4holes
✕20
11
648
217
40
60
Indoor unit
320
50
MU-18NNMU-24NN-
450
450
438
Installation plate
1015
775
56
S1
S1
160
352
17.5
20
274
284
297
3
Wall hole [75
190
Power supply cord
Lead to right 2m
Lead to left 1m
Air in
Air out
190 5
Installation plate
Liquid line [8-0.5m
Gas line [12-0.43m
Installation [50 O.D
[28 I.D
Drain hose [16
Insulation [28
OUTDOOR UNIT
35
248
Air in
Drainage
3holes [16.2
605
292
20
50
350
Air out
183
500
850
20
74
157
290
30
100
310
If both sides or back
side is vacant. only
345
to be free 50cm in
front of a unit.
30
161
Service panel
Liquid refrigerant
pipe joint
Refrigerant pipe (flared)
o
[6.35(MS-18)
[9.52(MS-24)
o
35
Gas refrigerant
pipe joint
Refrigerant pipe (flared)
[15.88
If a front side
or both side is vacant,
an upper side of a
unit has only to be vacant 10cm.
7
5
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
1
CN201
1
3
3
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
3
RED
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
WIRING DIAGRAM
INDOOR UNIT
MS-18NN-
TO OUTDOOR
UNIT
CONNECTING
POWER SUPPLY
CORD
1[220V
60Hz
MS-24NN-
S1
TB
L
❈
BRN
2
❈
N
❈
BLU
GRN/YLW
S1
❈
MODEL MS-18NN - WIRING DIAGRAM
S1
BRN
❈
4
52C
❈
3
WHT
BLU
F12
BLU
BLU
2
1
BLU
CN201
3
1
BRN
LD1
CN
CN
CN
101
GRN/YLW
DSAR
3
RECEIVER
P.C.BOARD
REMOTE
CONTROLLER
MODEL MS-24NN - WIRING DIAGRAM
102
3
DISPLAY
P.C.BOARD
151
MV
S1
ELECTRONIC CONTROL P.C BOARD
5
HIC1
TRANS
F11
IC141
NR11
CN
112
3
CN
121
CN211
C11
4
2
1
CN
111
BRN
YLW
GRY
WHT
RED
BLK
RT11
RT12
MF
❈
❈
❈
❈
NOTES : 1.For the outdoor electric wiring refer to the outdoor unit electric wiring diagram for servicing.
8
2.Use copper conductors only. (For field wiring)
3.Symbols below indicate.
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.
/ : Terminal block : Connector
11
Side the sleeve.
22
Pull the wire while
pushing the locking lever.
OUTDOOR UNIT
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
C1MF26F1C2TB
52CMCX1
CR
TERMINAL BLOCK
CONTACTOR
SYMBOL NAME SYMBOL NAME
COMPRESSOR FAN MOTOR
CAPACITOR (INNER THERMOSTAT)
FAN MOTOR
CAPACITOR
COMPRESSOR
(INNER THERMOSTAT)
C1MFC2TBMC
TERMINAL BLOCK
MU-18NN-
S1
MODEL MU-18NN - WIRING DIAGRAM
S1
TB
GRN/YLW
TO INDOOR
UNIT
CONNECTING
MU-24NN-
TO INDOOR
UNIT
CONNECTING
S1
TB
2
N
3
❈
2
N
❈
MODEL MU-24NN - WIRING DIAGRAM
WHT
2
S1
52C
1
BLK
WHT
52C
YLW
❈
YLW
4
6
3
52C
5
C2
❈
BLK
RED
❈
GRN/YLW
GRY
GRY
b
a
RED
52C
CR
5
GRY
78
X1
3
6
X1
1
26F1
BLK
RED
ORN
WHT
BLK
YLW
1
2
3
4
5
6
WHT
C1
C2
RED
ORN
WHT
BLK
YLW
RED
BLK
MF
S
BLK
WHT
ORN
RED
MC
BLK
4
WHT
3
ORN
2
RED
1
C
MC
RED
R
MF
C
RS
BLK
C1
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
11
Side the sleeve.
22
Pull the wire while
pushing the locking lever.
9
6
REFRIGERANT SYSTEM DIAGRAM
Umit:mm
MS-18NN -
INDOOR UNIT
Indoor heat
exchanger
RT11
Room
temperature
thermistor
S1
Indoor coil
thermistor
RT12
Refrigerant pipe
(Option) [15.88
(with heat insulator)
Flared
connector
Flared
connector
Refrigerant pipe
(Option)[6.35
(with heat insulator)
Stop valve
(With service port)
Stop Valve
ACCUMULATOR
DISCHARGE
PRESSURE
[
1.4 650
[
2.0 700
REGULATOR
Compressor
STRAINER
MU-18NN -
S1
OUTDOOR UNIT
Outdoor
heat
exchanger
Flow of refrigerant
MS-24NN -
INDOOR UNIT
Indoor heat
exchanger
RT11
Room
temperature
thermistor
10
S1
Indoor coil
thermistor
RT12
Refrigerant pipe
(Option) 15.88
(with heat insulator)
Refrigerant pipe
(Option) 9.52
(with heat insulator)
[
Flared
connector
Flared
connector
[
Stop valve
(With service port)
Stop Valve
ACCUMULATOR
[
1.6 350
[
2.0 600
Compressor
DISCHARGE
PRESSURE
REGULATOR
[
2.0 100
STRAINER
Umit:mm
MU-24NN -
S1
OUTDOOR UNIT
Outdoor
heat
exchanger
Flow of refrigerant
Model Outdoor unit precharged Refrigerant piping length (one way)
(up to 7m) 7m 10m 15m
MS-18NN - 1650
MS-24NN - 2150
0
45
120
S1
S1
Additional piping
Model Max. length : m
A Gas Liquid Indoor unit Outdoor unit
MS-18NN - 15
[6.35
MS-24NN -
[9.52
15
[15.88
0.43
0
S1
S1
Piping size O.D : mm
Length of connecting pipe : m
MAX. REFRIGERANT PIPING LENGTH
MAX. HEIGHT DIFFERENCE
ADDITIONAL REFRIGERANT CHARGE(R-22 : g)
Note : Calculation : Xg=15g/m✕(A-7)m
11
EVACUATION PROCEDURES
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 it initial state fresh out of the factory (totally closed with cap on).)
Connect the gage manifold valve and the vacuum pump to
the service port of the stop valve on the gas pipe side of the
outdoor unit.
Run the vacuum pump(Vacuumize for more than 15 minutes.)
and at this time confirm that the pressure gage shows -0.1
Mpa ( -76cm Hg).
Check the vacuum with the gage manifold valve, then close
the gage manifold valve, and stop the vacuum pump.
Leave it as is for one or two minutes. Make sure the pointer
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.
12
Pipe length :
7m maximum
No gas charge
is needed
Tighten the cap to the service port to obtain the initial status
Retighten the cap
Leak test
Pipe length
exceeding 7m
Charge the prescribed
amount of gas
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