11. PARTS LIST······················································22
12. RoHS PARTS LIST···········································24
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.
Revision A:
• 11-1. PARTS LIST has been modified. (The parts No. of BACK PANEL has been changed.)
Revision B:
• MU-GA20VB-and MU-GA25VB-have been added.
1
TECHNICAL CHANGES
MU-A07YV-➔MU-GA20VB-
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-➔MU-GA25VB-
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.
7. Compressor has been changed. (RN099VHSHT ➔ RN092VHSHT)
MU-A12YV-➔MU-GA35VB-
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 ➔ 5PS132DAH01)
8. Stop valve (Gas) has been changed from [12.7 to [9.52.
9. Fuse for compressor protection has been added.
E2E2
E1E1
E1E1
E1E1
MU-GA20VB-➔MU-GA20VBMU-GA25VB-➔MU-GA25VB-
1. Compressor has been changed. (RN092VHST ➔ KN092VDMHC)
2. Compressor capacitor has been changed.
3. Capillary tube has been changed. ([3.0x[1.4x700 ➔ [3.0x[1.4x900)
E2E1
E2E1
2
2
Air outlet
Drain outlet
Piping
Drain hose
( )
Air inlet
back : MU-GA20VB
MU-GA25VB
back and side : MU-GA35VB
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)
kW
R/h
K /h
A
A
W
A(kW)
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
MU-GA25VB -
E2
Single phase
230V,50Hz
10
KN092VDMHC
650
C-R 3.62
C-S 5.40
RA6V21-AC
WHT-BLK 366
BLK-RED 274
800o550o285
27
45
745
1
0.60
350 (NEO22 )
2.5
1.1
1,800
3.40
775
–
99
15.5
2.99
0.245
3.23
MU-GA25VB -
E1
Single phase
230V,50Hz
10
RN092VHSHT
600
C-R 3.87
C-S 6.14
RA6V21-AC
WHT-BLK 366
BLK-RED 274
800o550o285
31
45
745
1
0.60
350 (NEO22 )
2.5
1.1
1,800
3.40
775
–
99
21
2.99
0.245
3.23
MU-GA35VB -
E1
Single phase
230V,50Hz
1.7
10
5PS132DAH01
900
C-R 2.80
C-S 5.43
RA6V33-KA
WHT-BLK 215
BLK-RED 307
800o550o285
30
49
855
1
0.70
350 (RB68A)
3.45
1,902
5.02
1,120
–
97
21
4.50
0.33
3.08
Compressor
Electrical
data
Fan
motor
Special
remarks
Capacity
Coefficient of performance(C.O.P)
Outdoor unit power supply
Outdoor model
NOTE: Test conditions are based on ISO 5151.
Cooling : IndoorDB27°C WB19°C
Outdoor DB35°C WB24°C
Indoor-Outdoor piping length : 5m
4
4
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling :DB35:WB24:
MU-GA35VB
COOL
FUNCTION
49
SPL(dB(A))LINE
OUTDOOR UNIT
MICROPHONE
1m
90
80
70
60
50
40
30
20
10
631252505001000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : DB27:WB19:
MU-GA20VB
MU-GA25VB
COOL
FUNCTION
45
SPL(dB(A))LINE
NOISE CRITERIA CURVES
5
5
C2
C1
WHT
POWER SUPPLY
~/N 230V 50Hz
CIRCUIT
BREAKER
BLU
BRN
WHT
RED
BLU
WHT
BLK
RED
12V
TO INDOOR
UNIT
CONNECTING
WHT
BLK
DSAR
52C
TB2
2
1
C
R
S
GRN/YLW
PE
N
L
BRN
TB1
COM
52C
NO
MC
1
3
2
BLK
RED
WHT
MF
SYMBOL
TB2
52C
SYMBOL
MC
MF
TB1
SYMBOL
C1
C2
DSAR
NAME
NAMENAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
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 provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198~264V
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature :°CWB
(2) Indoor outlet air wet-bulb temperature :°CWB
(3) Outdoor intake air dry-bulb temperature :°CDB
(4) Total input:W
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 to start the EMERGENCY COOL 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.
Cooling
}
8
INDOOR UNIT
1832
230V
1520
50
25
6030 70
(%)
35(:)
0.7
0.8
0.9
1.0
1.1
1.2
1.3
7
8
9
10
11
12
13
1520
50
25
60
30
70(%)
35(:)
1
2
4
3
1832
230V
OUTDOOR UNIT
Wet-and dry-bulb
thermometers
Wet-and dry-bulb
thermometers
8-1.CAPACITY AND THE INPUT CURVES
9.6
8.5
7.8
7.1
6.4
5.8
5.1
MSC-GA20VB
11.0
8.8
10.0
8.0
7.2
6.5
5.7
MU-GA20VB
MU-GA25VB
MSC-GA25VB
9.1
8.2
7.4
6.5
MU-GA35VB
MSC-GA35VB
8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
COOL operation
① Both indoor and outdoor unit are under the same temperature/humidity condition.
Dry-bulb temperature
20
25
3070
Relative humidity(%)
50
60
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[Gauge]) =10.2(kgf/ff[Gauge] )
NOTEQ :Total capacity (kW)SHF :Sensible heat factorDB :Dry-bulb temperature
SHC :Sensible heat capacity (kW)INPUT :Total power input (W)WB :Wet-bulb temperature
16
9
Lead wiring
Housing point
TROUBLESHOOTING
MU-GA20VB
MU-GA25VB
MU-GA35VB
9-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.
1) Before servicing the air conditioner, be sure to turn off the main unit first with the remote controller, and then after
confirming the horizontal vane is closed, turn off the breaker and/ or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
17
9-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
OPERATION
INDICATOR
lamp on the
indoor unit is
flashing on
and off.
Outdoor unit
operates in
only Test Run
operation. W
Indoor unit
operates,
when the
EMERGENCY
OPERATION
switch is
pressed.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is
pressed.
Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage" .
Refer to
"Check of
remote
controller
and receiver
P.C. board".
2-time flash
Cause:
Indoor unit
• Trouble of
room temp erature/
indoor coil
thermistor
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Check room
temperature
thermistor
and indoor
coil thermistor.
Refer to
"Test point
diagram and
voltage".
Refer to
"Check of
indoor fan
motor".
1. Check indoor /
outdoor
connecting wire.
2. Refer to
"Check of indoor
electronic control
P.C. board".
Outdoor unit
doesn't
stop even
if indoor unit
stops.
Check of
wiring diagram
of outdoor unit
(Refer to 6.
WIRING
DIAGRAM.)
Flash on and
off at 0.5-second
intervals
Cause:
Wrong setting
of switch (SW2-2)
on the electronic
control P.C. board.
Refer to 9-4. A
"Check of
MU & MUX TYPE /
MUH & MXZ TYPE
SWITCH OVER "
(When
outdoor unit
doesn't operate.).
4-time flash
Cause:
Indoor unit
• Trouble of
indoor unit
control
system
Replace the
indoor
electronic
control
P.C. board.
W "Test run operation"
means the operation
within 30 minutes
after
EMERGENCY
OPERATION
switch is pressed.
Refer to indoor
unit service
manual.
MU-GA20VB
MU-GA25VB
MU-GA35VB
18
P
R
C
S
RED
BLK
WHT
MAINAUX.
R
R
C
S
MAINAUX.
WHTRED
BLK
MAIN
AUX.
FUSE
9-3. Trouble criterion of main parts
MU-GA20VB
MU-GA25VB
MU-GA35VB
Part name
Compressor
(MC)
INNER
PROTECTOR
MU-GA20/
GA25VB-
E1
150i 5°C OPEN
90i10°C CLOSE
MU-GA20/
GA25VB-
E2
160i5°C OPEN
90i10°C CLOSE
OVERLOAD
RELAY
MU-GA35VB
140i 5°C OPEN
75i 5°C CLOSE
Outdoor fan
motor
(MF)
INNER FUSE
145i 2°C
CUT OFF
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
MU-GA20/GA25VB
C-R
C-S
3.41~4.18Ω
5.41~6.63Ω
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
Color of
lead wire
WHT-BLK
BLK-RED
Check method and criterion
Normal
E1
-
MU-GA20/GA25VB
3.19~3.91Ω
4.76~5.83Ω
Normal
MU-GA20/GA25VB
323 ~ 396
241 ~ 296
Ω
Ω
E2
-
MU-GA35VB
189 ~ 233
270 ~ 332
Ω
Ω
MU-GA35VB
2.46~3.01Ω
4.79~5.56Ω
Figure
MU-GA20/GA25VB
MU-GA35VB
9-4. Troubleshooting flow
Indoor unit MSC type
When OPERATION INDICATOR lamp flashes 0.5-second intervals.
Outdoor unit doesn’t operate.
AA
Check of MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER
Start
Turn OFF the power supply (indoor / outdoor unit).
Set switch (SW2-2) on the indoor electronic
control P.C. board to MU type. w1
Does the unit operate?
No
Refer to the
"Instruction of
troubleshooting."
Yes
w 1 Set the switch (SW2-2) on the indoor electronic control P.C. board to
MU type, when the outdoor unit is MU type.
If the setting is MUH or MXZ type, the unit does not work.
Refer to "MU & MUX TYPE / MUH& MXZ TYPE SWITCH OVER AND
AUTO RESTART FUNCTION" on the indoor unit service manual.
OK
19
P INNER PROTECTOR
R OVERLOAD RELAY
10
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
Sleeve
1Slide the sleeve.
2Pull the terminal while
Locking lever
pushing the locking
lever.
MU-GA20VB MU-GA25VB MU-GA35VB
OUTDOOR UNIT
OPERATING PROCEDURE
1. Removing the cabinet
(1) Remove the screws of the top panel.
(2) Remove the screw of the service panel.
(3) Remove the screws of the cabinet.
(4) Remove the screws of the front panel and motor support.
(5) Remove the service panel, and remove the screw from
the insides.
(6) Remove the top panel.
(7) Remove the cabinet.
(2) The terminal with this connector has the
locking mechanism.
1Hold the sleeve, and
pull out the terminal
slowly.
Connector
PHOTOS
Photo 1
Screw of the front panel and motor support
Photo 3
Screws of the
top panel
Screw of the cabinet
Screw of the
Service panel
Screws of the cabinet
Photo 2
MU-GA20/GA25VB
Screws of
the top panel
Screws of
the cabinet
20
OPERATING PROCEDUREPHOTOS
2. Removing the electrical parts
(1) Remove the service panel and the cabinet.(Refer to 1.)
(2) Remove the following parts.
• Compressor capacitor (C1)
• Outdoor fan capacitor (C2)
• Terminal block (TB1, TB2)
• Surge absorber (DSAR)
• Compressor contactor (52C)
3. Removing the propeller and the outdoor fan motor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the propeller nut.
(3) Remove the propeller.
NOTE : Loose the propeller in the rotating direction for
removal.
When attaching the propeller, align the mark on the
propeller and the motor shaft cut section.
Set the propeller in position by using the cut on the
shaft and the mark on the propeller.
(4) Remove lead clamps and disconnect the outdoor fan motor
connector.
(5) Remove screws fixing the fan motor.
(6) Remove the outdoor fan motor.
Photo 4
Compressor
capacitor (C1)
Outdoor fan
capacitor (C2)
Photo 5
Screws of the
outdoor fan motor
Propeller
Compressor
contactor (52C)
Surge absorber
(DSAR)
Hook
block(TB2)
Outdoor
fan motor
Terminal
Terminal
block
(TB1)
Outdoor
fan motor
connector
4. Removing the compressor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the relay panel.
(3) Remove the soundproof felt.
(4) Remove the terminal cover on the compressor.
(5) Disconnect lead wires from the glass terminal of the com-
pressor.
(6) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge
shows 0 kg/cm
(7) Disconnect the welded part of the discharge pipe.
(8) Disconnect the welded part of the suction pipe.
(9) Remove nuts fixing the compressor.
)
(
Remove the compressor.
10
2
(0 MPa) .
21
Propeller nut
Screws of the
outdoor fan motor
Photo 6
Glass
terminal
Compressor
Compressor nuts
Discharge
pipe
Suction
pipe
11
PARTS LIST (non-RoHS compliant)
MU-GA20VB
MU-GA25VB
MU-GA35VB
11-1.
OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
OUTDOOR FAN MOTOR
OUTDOOR FAN MOTOR
PROPELLER
CABINET
CABINET
GRILLE(OUT)
BASE
BASE
COMPRESSOR RUBBER SET
COMPRESSOR RUBBER SET
COMPRESSOR
COMPRESSOR
STOP VALVE(GAS)
STOP VALVE(LIQUID)
BACK PANEL
BACK PANEL
SERVICE PANEL
TERMINAL BLOCK
TERMINAL BLOCK
OUTDOOR FAN CAPACITOR
OUTDOOR FAN CAPACITOR
COMPRESSOR CAPACITOR
COMPRESSOR CAPACITOR
CONDENSER NET
CONDENSER NET
MOTOR SUPPORT
TOP PANEL
SEPARATOR
FUSE
FUSE HOLDER
COMPRESSOR CONTACTOR
SURGE ABSORBER
CAPILLARY TUBE
CAPILLARY TUBE
OVERLOAD RELAY
RA6V21RA6V33-
3RUBBERS/SET
3RUBBERS/SET
RN092VHSHT
5PS132DAH01
{9.52
{6.35
3P
2P
1.8µF/440VAC
2.0µF/440VAC
20µF/440VAC
25µF/440VAC
T20AL250V
{3.0x{1.4x700
{3.0x{1.4x450
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MF
MF
MC
MC
TB1
TB2
C2
C2
C1
C1
F
52C
DSAR
51C
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MU-GA20VB-
E1
E1
E1
MU-GA25VB-
MU-GA35VB-
PARTS LIST (non-RoHS compliant)
MU-GA20VB MU-GA25VB MU-GA35VB
11-1.
OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS
Part numbers that are circled are not shown in the illustration.
23
12
RoHS PARTS LIST (RoHS compliant)
MU-GA20VB
MU-GA25VB
MU-GA35VB
12-1.
OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS
20
1
2
3
4
5
19
6
7
17
18
9
8
This figure shows MU-GA20/GA25VB.
16
1514
10
13
12
11
24
No.
RoHS
Part No.
Part name
Remarks
Symbol
in Wiring
Diagram
Q'ty/unit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
G
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
OUTDOOR FAN MOTOR
OUTDOOR FAN MOTOR
PROPELLER
CABINET
CABINET
GRILLE(OUT)
BASE
BASE
BASE
COMPRESSOR RUBBER SET
COMPRESSOR RUBBER SET
COMPRESSOR RUBBER SET
COMPRESSOR
COMPRESSOR
COMPRESSOR
STOP VALVE(GAS)
STOP VALVE(LIQUID)
STOP VALVE(LIQUID)
BACK PANEL
BACK PANEL
SERVICE PANEL
TERMINAL BLOCK
TERMINAL BLOCK
OUTDOOR FAN CAPACITOR
OUTDOOR FAN CAPACITOR
COMPRESSOR CAPACITOR
COMPRESSOR CAPACITOR
CONDENSER NET
CONDENSER NET
MOTOR SUPPORT
TOP PANEL
SEPARATOR
FUSE
FUSE HOLDER
COMPRESSOR CONTACTOR
SURGE ABSORBER
CAPILLARY TUBE
CAPILLARY TUBE
CAPILLARY TUBE
OVERLOAD RELAY
OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS
Part numbers that are circled are not shown in the illustration.
25
26
27
HEAD OFFICE: TOKYO BLDG.,2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN
CC
Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in May 2006. No.OB386 REVISED EDITION-B 6
Distributed in Mar. 2005. No.OB386 REVISED EDITION-A 6
Distributed in Jan. 2005. No.OB386 6
Made in Japan
New publication, effective May 2006
Specifications subject to change without notice.
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