Mitsubishi OB386D Service Manual
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
Revision D:
MU-GA20VB-
been added.
Please void OB386 REVISED EDITION-C.
E3
and MU-GA35VB-E3 have
SERVICE MANUAL
Models
MU-GA20VBMU-GA20VBMU-GA20VBMU-GA25VBMU-GA25VBMU-GA35VBMU-GA35VBMU-GA35VB-
E1
E2
E3
E1
E2
E1
E2
E3
HFC
utilized
R410A
Indoor unit service manual
MSC-GA
MSC-CA•VB Series (OB393)
MSC-GE•VB Series (OBH529)
No. OB386
REVISED EDITION-D
•VB Series (OB385)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 3
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 6
6. WIRING DIAGRAM ············································ 6
7. REFRIGERANT SYSTEM DIAGRAM ··············· 8
8. PERFORMANCE CURVES ······························11
MU-GA20VB
MU-GA25VB
MU-GA35VB
NOTE:
• This service manual describes technical data of outdoor units.
• RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
9. TROUBLESHOOTING ····································· 19
10. DISASSEMBLY INSTRUCTIONS ···················· 22
11. PARTS LIST ····················································· 24
12. RoHS PARTS LIST ·········································· 26
Revision A:
11-1. PARTS LIST has been modified. (The parts No. of BACK PANEL has been changed.)
Revision B:
MU-GA20VB-E2 and MU-GA25VB-E2 have been added.
Revision C:
MU-GA35VB-E2 has been added.
Revision D:
MU-GA20VB-E3 and MU-GA35VB-E3 have been added.
1
MU-A07YV-
1. Indication of capacity has been changed. (BTU base kW base)
2. Unit size has been changed. (W780mm x H540mm x D255mm W800mm x H550mm x D285mm)
3. Outdoor fan motor has been changed. (RC6V20-AC RA6V21-AC)
4. Stop valve cover has been added.
5. Outdoor fan capacitor has been changed.
6. Compressor capacitor has been changed.
MU-A09YV-
1. Indication of capacity has been changed. (BTU base kW base)
2. Unit size has been changed. (W780mm x H540mm x D255mm
3. Outdoor fan motor has been changed. (RC6V20-AC
4. Stop valve cover has been added.
5. Outdoor fan capacitor has been changed.
6. Compressor capacitor has been changed.
7. Compressor has been changed. (RN099VHSHT RN092VHSHT)
MU-A12YV-
1. Indication of capacity has been changed. (BTU base kW base)
2. Unit size has been changed. (W780mm x H540mm x D255mm W800mm x H550mm x D285mm)
3. Outdoor fan motor has been changed. (RC6V33-AC RA6V33-KA)
4. Stop valve cover has been added.
5. Outdoor fan capacitor has been changed.
6. Compressor capacitor has been changed.
7. Compressor has been changed. (RN135VHSHT
8. Stop valve (Gas) has been changed from
9. Fuse for compressor protection has been added.
TECHNICAL CHANGES
E1
MU-GA20VB-
E1
MU-GA25VB-
E1
MU-GA35VB-
E1
E1
RA6V21-AC)
E1
5PS132DAH01)
12.7 to 9.52.
W800mm x H550mm x D285mm)
MU-GA20VBMU-GA25VB-
1. Compressor has been changed. (RN092VHST KN092VDMHC)
2. Compressor capacitor has been changed.
3. Capillary tube has been changed. ( 3.0 x 1.4 x 700
MU-GA35VB-
1. Outdoor heat exchanger has been changed. (1 row 2 row)
2. Refrigerant filling capacity has been changed. (0.70 kg
3. Outdoor unit weight has been changed. (30 kg 34 kg)
MU-GA20VB-
1. Compressor has been changed. (KN092VDMHC KN083VDMHC)
2. Refrigerant filling capacity has been changed. (0.60 kg 0.65 kg)
MU-GA35VB-
1. Refrigerant filling capacity has been changed. (0.90 kg 1.05 kg)
2. Fin shape of outdoor heat exchanger has been changed.
E1
MU-GA20VB-
E1
MU-GA25VB-
E1
MU-GA35VB-
E2
MU-GA20VB-
E2
MU-GA35VB-
E2
E2
3.0 x 1.4 x 900)
E2
0.90 kg)
E3
E3
2
2
PART NAMES AND FUNCTIONS
OUTDOOR UNIT
MU-GA20VB
MU-GA25VB
MU-GA35VB
3
Capacity
Electrical
Coefficient of performance (C.O.P)
Compressor
Fan
Special
SPECIFICATION
Outdoor model
Outdoor unit power supply
Capacity
Dehumidification
Outdoor air flow
Breaker capacity
Running current
Power input
Auxiliary heater
Power factor
data
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance (at 20 ºC)
Model
Winding
motor
resistance (at 20 ºC)
Dimensions W x H x D
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
remarks
capacity (R410A)
Refrigeration oil (Model)
kW
/h
/h
A
A
W
A(kW)
%
A
A
A
W
Ω
Ω
mm
kg
dB
rpm
kg
cc
MU-GA20VB -
Single phase
230 V,50 Hz
2.3
0.9
1,800
10
3.17
715
–
98
21.0
2.76
0.245
3.22
RN092VHSHT
600
C-R 3.87
C-S 6.14
RA6V21-AC
WHT-BLK 366
BLK-RED 274
800 x 550 x 285
31
45
745
1
0.60
350 (NEO22)
Air inlet
back : MU-GA20VB
( )
MU-GA25VB
back and side : MU-GA35VB
Piping
Drain hose
Air outlet
Drain outlet
E1
MU-GA20VB -
Single phase
230 V,50 Hz
2.3
0.9
1,800
10
3.17
715
–
98
15.5
2.76
0.245
3.22
KN092VDMHC
650
C-R 3.62
C-S 5.40
RA6V21-AC
WHT-BLK 366
BLK-RED 274
800 x 550 x 285
27
45
745
1
0.60
350 (NEO22)
E2
MU-GA20VB -
Single phase
230 V,50 Hz
2.3
0.9
1,800
10
3.17
715
–
98
21.0
2.76
0.25
3.22
KN083VDMHC
500
C-R 4.52
C-S 7.07
RA6V21-AC
WHT-BLK 366
BLK-RED 274
800 x 550 x 285
27
45
745
1
0.65
350 (NEO22)
E3
NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor Dry-bulb temperature 27 Wet-bulb temperature 19
Outdoor Dry-bulb temperature 35 Wet-bulb temperature 24
Indoor outdoor piping length : 5 m
3
Outdoor model
Outdoor unit power supply
Capacity
Dehumidification
Outdoor air flow
Capacity
Breaker capacity
Running current
Power input
Auxiliary heater
Power factor
Electrical
data
Starting current
A(kW)
Compressor motor current
Fan motor current
Coefficient of performance (C.O.P)
Model
Output
Winding
resistance (at 20 ºC)
Compressor
Model
Winding
Fan
motor
resistance (at 20 ºC)
Dimensions W x H x D
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
Special
remarks
capacity (R410A)
Refrigeration oil (Model)
kW
/h
/h
A
A
W
%
A
A
A
W
Ω
Ω
mm
kg
dB
rpm
kg
cc
MU-GA25VB
E1
-
Single phase
230 V, 50 Hz
2.5
1.1
1,800
10
3.40
775
–
99
21
2.99
0.245
3.23
RN092VHSHT
600
C-R 3.87
C-S 6.14
RA6V21-AC
WHT-BLK 366
BLK-RED 274
800 x 550 x 285
31
45
745
1
0.60
350 (NEO22)
MU-GA25VB
E2
-
Single phase
230 V,50 Hz
2.5
1.1
1,800
10
3.40
775
–
99
15.5
2.99
0.245
3.23
KN092VDMHC
650
C-R 3.62
C-S 5.40
RA6V21-AC
WHT-BLK 366
BLK-RED 274
800 x 550 x 285
27
45
745
1
0.60
350 (NEO22)
MU-GA35VB
E1
-
Single phase
230 V, 50 Hz
3.45
1.7
1,902
10
5.02
1,120
–
97
21
4.50
0.33
3.08
5PS132DAH01
900
C-R 2.80
C-S 5.43
RA6V33-KA
WHT-BLK 215
BLK-RED 307
800 x 550 x 285
30
49
855
1
0.70
350 (RB68A)
MU-GA35VB
E2
-
Single phase
230 V, 50 Hz
3.45
1.7
1,902
10
5.02
1,120
–
97
21
4.50
0.33
3.08
5PS132DAH01
900
C-R 2.80
C-S 5.43
RA6V33-KA
WHT-BLK 215
BLK-RED 307
800 x 550 x 285
34
49
855
1
0.90
350 (RB68A)
MU-GA35VB
E3
-
Single phase
230 V, 50 Hz
3.45
1.7
1,902
10
5.02
1,120
–
97
26
4.50
0.33
3.08
5PS132DAH01
900
C-R 2.80
C-S 5.43
RA6V33-KA
WHT-BLK 215
BLK-RED 307
800 x 550 x 285
34
49
855
1
1.05
350 (RB68A)
NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor Dry-bulb temperature 27 Wet-bulb temperature 19
Outdoor Dry-bulb temperature 35 Wet-bulb temperature 24
Indoor outdoor piping length : 5 m
4
4
NOISE CRITERIA CURVES
MU-GA20VB
MU-GA25VB
FUNCTION
COOL
SPL(dB
45
(A)
)LINE
MU-GA35VB
FUNCTION
COOL
SPL(dB
49
(A)
)LINE
Test conditions,
Cooling :Dry-bulb temperature 27 ºC Wet-bulb temperature 19 ºC
90
80
70
60
50
40
30
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
20
10
63 125 250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
NC-10
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
Test conditions,
Cooling :Dry-bulb temperature 35 ºC Wet-bulb temperature 24 ºC
90
80
70
60
50
40
30
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
20
10
63 125 250 500 1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
NC-10
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
OUTDOOR UNIT
1m
MICROPHONE
5
5
OUTLINES AND DIMENSIONS
MU-GA20VB MU-GA25VB MU-GA35VB
OUTDOOR UNIT
344.5
285
550
44
Air in
(MU-GA35VB)
2 holes 10 x 21
22.3
Handle
280
10
400
Air in
Air out
150
302.5
500 Bolt pitch for installation
Drain hole 42
40
17.5
164.5
69
800
installation
Bolt pitch for
23
99.5
Service port
REQUIRED SPACE
100mm or more
304~325
Service panel
Liquid refrigerant pipe joint
Refrigerant pipe (flared) 6.35
35°
Gas refrigerant pipe joint
Refrigerant pipe (flared) 9.52
170.5
Unit: mm
Basically open 100mm or more
without any obstruction in front
and on both sides of the unit.
100mm or more
350mm or more
200mm or more
Open two sides of left,
right, or rear side.
43°
6
MU-GA20VB-
OUTDOOR UNIT
WIRING DIAGRAM
E1, E2
MU-GA25VB
TB2
12V
TO INDOOR
UNIT
CONNECTING
CIRCUIT
BREAKER
TB1
WHT
2
BLK
1
52C
BRN
DSAR
52C
BRN
COM
L
NO
BLU
N
POWER SUPPLY
~/N 230V 50Hz
PE
BLU
GRN/YLW
SYMBOL
C1
C2
DSAR
NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.
2. Use copper conductors only. (For field wiring)
3. Symbols below indicate.
: Terminal block, : Connector
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
NAME
SYMBOL
MC
MF
TB1
COMPRESSOR(INNER PROTECTOR)
OUTDOOR FAN MOTOR(INNER FUSE)
TERMINAL BLOCK
WHT
C2
RED
WHT
NAME NAME
6
WHT
C1
RED
BLK
3
2
1
SYMBOL
RED
BLK
WHT
TB2
52C
C
S
MC
R
MF
TERMINAL BLOCK
COMPRESSOR CONTACTOR
MU-GA20VB-
E3
OUTDOOR UNIT
MU-GA35VB-
OUTDOOR UNIT
SYMBOL
C1
C2
DSAR
NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.
2. Use copper conductors only. (For field wiring)
3. Symbols below indicate.
: Terminal block, : Connector
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
FUSE (T20AL250V)
F
E1, E2
NAME
12V
TO INDOOR
UNIT
CONNECTING
CIRCUIT
BREAKER
POWER SUPPLY
~/N 230V 50Hz
TB2
WHT
2
BLK
1
TB1
L
N
PE
SYMBOL
MC
MF
TB1
TB2
52C
DSAR
BRN
F
BRN
BLU
BLU
GRN/YLW
COMPRESSOR
OUTDOOR FAN MOTOR (INNER FUSE)
TERMINAL BLOCK
TERMINAL BLOCK
52C
WHT
C2
WHT
C1
RED
WHT
BRN
COM
NO
NAME NAME
51C
RED
WHT
S
C
MC
41
BLK
RED
3
BLK
2
1
WHT
SYMBOL
51C
52C
MF
R
OVERLOAD RELAY
COMPRESSOR CONTACTOR
7
MU-GA35VB-
E3
OUTDOOR UNIT
7
REFRIGERANT SYSTEM DIAGRAM
MU-GA20VB
MU-GA25VB
MU-GA35VB-
E1
OUTDOOR UNIT
Flared connection
Flared connection
Refrigerant pipe 9.52
(with heat insulator)
Stop valve
(with service port)
Unit: mm
Muffler
(MU-GA20VB, MU-GA25VB)
Outdoor
heat
exchanger
Compressor
Stop valve
Refrigerant pipe 6.35
(with heat insulator)
Strainer
#100
Capillary tube
3.0 x 1.4 x 700 (MU-GA20VB-E1, MU-GA25VB-E1)
3.0 x 1.4 x 900 (MU-GA20VB-E2, MU-GA20VB-E3, MU-GA25VB-E2)
3.0 x 1.4 x 450 (MU-GA35VB
8
E1
-
)
Refrigerant flow in cooling
MU-GA35VB-
E2
OUTDOOR UNIT
Refrigerant pipe 9.52
(with heat insulator)
Flared connection
Flared connection
Unit: mm
Stop valve
(with service port)
Outdoor
heat
exchanger
Compressor
MU-GA35VB-
E3
OUTDOOR UNIT
Refrigerant pipe 6.35
(with heat insulator)
Refrigerant pipe 9.52
(with heat insulator)
Flared connection
Stop valve
Stop valve
(with service port)
Strainer
#100
Capillary tube
3.0 x 1.4 x 350
Refrigerant flow in cooling
Outdoor
heat
exchanger
Compressor
Flared connection
Refrigerant pipe 6.35
(with heat insulator)
Stop valve
Strainer
#100
Capillary tube
3.0 x 1.4 x 400
Refrigerant flow in cooling
9
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