Download Mitsubishi Electric MSH-GA50VB Service manual

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Page 1
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
No. OB367
SERVICE MANUAL
Wireless type
Models
MSH-GA50VB MSH-GA60VB MSH-GA80VB -
E1
(WH)
E1
(WH)
E1
(WH)
CONTENTS
Indication of model name
MSH-GA50VB MSH-GA60VB MSH-GA80VB -
E1
E1
E1
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. NOISE CRITERIA CURVES ·······························5
5. OUTLINES AND DIMENSIONS ·························6
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM ················8
8. SERVICE FUNCTIONS ······································9
9. TROUBLESHOOTING·······································11
10. DISASSEMBLY INSTRUCTIONS·····················19
11. PARTS LIST······················································21
12. OPTIONAL PARTS···········································23
NOTE:
This service manual describes technical data of the indoor units.
As for outdoor units MUH-GA50VB - E1 , MUH-GA60VB - E1 and MUH-GA80VB refer to service manual OB368.
E1
,
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TECHNICAL CHANGES
MSH-A18WV - E1 ➔MSH-GA50VB - E1
MSH-A24WV - E1 ➔MSH-GA60VB - E1
MSH-A30WV - E1 ➔MSH-GA80VB - E1
1. Model name has been changed.
Indication of capacity has been changed. (BTU➔kW)
2. Grille design has been changed.
3. Unit size has been changed.(W 1,100aoH 325aoD 227a ➔ W1,100aoH 325aoD 258a)
2
PART NAMES AND FUNCTIONS
INDOOR UNIT
MSH-GA50VB - E1
MSH-GA60VB - E1
MSH-GA80VB - E1
Air cleaning filter (option)
(White bellows type)
Grille
Air inlet
To Breaker
Front panel
Power supply cord
Catechin air filter
Remote control
receiving section
Vertical vanes
Horizontal vane
Remote controller
Operation section
Display section
(When the grille is opened)
Operation indicator lamp
Emergency operation switch
Remote control
receiving section
ACCESSORIES
Indoor unit
1
2
3
4
5
6
7
Installation plate
Installation plate fixing screw 4 o 25 mm
Remote controller holder
Fixing screw for 3 o 3.5 o 1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
2
MSH-GA50VB MSH-GA60VB MSH-GA80VB 1
7
1
2
2
1
1
E1
E1
E1
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REMOTE CONTROLLER
MSH-GA50VB - E1
MSH-GA60VB - E1
MSH-GA80VB - E1
Signal transmitting section
Operation display section
PM
OPERATE /STOP
(ON /OFF)button
AM
TOO
ON/OFF WARM
TOO
COOL
TEMPERATURE buttons
Indication of remote controller
model is on back.
Open the front lid.
CLOCK
PM
AM
TOO
ON/OFF WARM
VANE button
(Horizontal vane button)
TOO
COOL
FAN
STOP
VANE
START
I FEEL COOL
FAN SPEED CONTROL button
OFF-TIMER button
HEAT DRY
ON-TIMER button
MODE WIDE VANE
HR.
OPERATION SELECT button
ECONO COOL
LONG
ECONO COOL button
MIN.
HR. button
MIN. button
(TIME SET button)
RESET CLOCK
CLOCK SET button
WIDE VANE button
(Vertical vane button)
LONG button
RESET button
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SPECIFICATION
Indoor model
MSH-GA50VB Cooling
Function
Power supply
Special
remarks
Fan
motor
Electrical
data
Capacity Air flow(High/Med.w/Low w ) K /h
Power outlet
A
Running current
A
Power input
W
Auxiliary heater
A(kW)
Power factor
%
Fan motor current
A
Model
Winding
"
resistance(at 20:)
Dimensions WOHOD
mm
Weight
kg
Air direction
Sound level(High/Med.w /Low w)
dB
Fan speed(High/Med.w /Loww ) rpm
Fan speed regulator
Thermistor RT11(at 25:) k"
Thermistor RT12(at 25:) k"
Remote controller model
Heating
Single phase
230V, 50Hz
768/642 w/528 w
10
0.3
60
—
87
0.30
RC4V32-AA
WHT-BLK 293
BLK-RED 146
1,100O325O258
16
5
42/38w /34 w
1,070/920w /780w
3
10
10
KM04A
Electrical
data
Fan
motor
Special
remarks
Heating
Single phase
230V, 50Hz
768/672 w /588 w
768/642 w/528 w
10
0.3
60
—
87
0.30
RC4V32-AA
WHT-BLK 293
BLK-RED 146
1,100O325O258
16
5
45/40 w/34 w
45/41w /37 w
w
w
w/780 w
1,070/920
1,070/960 /850
3
10
10
KM04A
Cooling
E1
Heating
Single phase
230V, 50Hz
Power supply
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Fan motor current
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High/Med.w/Low w )
Fan speed(High/Med.w /Low w )
Fan speed regulator
Thermistor RT11(at 25:)
Thermistor RT12(at 25:)
Thermistor RT13(at 25:)
Remote controller model
E1
Cooling
MSH-GA80VB -
Indoor model
Function
Capacity Air flow(High/Med.w/Low w )
MSH-GA60VB -
E1
K /h
A
A
W
A(kW)
%
A
960/822w /684 w
"
mm
kg
dB
rpm
960/834w /732 w
10
0.34
69
—
88
0.34
RC4V40-AA
WHT-BLK 138.2
BLK-RED 159.0
1,100O325O258
16
5
47/42 w /37 w
1,310/1,130w /970 w
1,310/1,150 w/1,020 w
3
10
10
10
KM04A
k"
k"
k"
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Heating : Indoor DB20°C WB 15.5°C
Outdoor DB35°C WB(24°C)
Outdoor DB 7°C WB 6°C
Indoor-Outdoor piping length : 5m
w Reference value
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NOISE CRITERIA CURVES
4
MSH-GA50VB - E1
MSH-GA60VB - E1
FAN SPEED SPL(dB(A))
High
FAN SPEED SPL(dB(A))
LINE
High
42
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
NC-20
250
500
1000
2000
4000
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
10
8000
45
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:
90
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:
90
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
BAND CENTER FREQUENCIES, Hz
125
NC-20
250
500
1000
2000
High
LINE
47
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:
90
80
WALL
1m
MICROPHONE
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
10
INDOORUNIT
0.8m
70
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
NC-20
250
500
1000
2000
4000
4000
BAND CENTER FREQUENCIES, Hz
MSH-GA80VB - E1
FAN SPEED SPL(dB(A))
8000
BAND CENTER FREQUENCIES, Hz
5
LINE
8000
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Page 6
OUTLINES AND DIMENSIONS
MSH-GA50VB - E1
MSH-GA60VB - E1
MSH-GA80VB - E1
Unit: mm
Installation plate
Indoor unit
98
7.5
173
98
414.5
414.5
173
47
2.5
47
255.5
1068
315
INDOOR UNIT
Wall hole [75
258
1100
Air in
5
Installation plate
{
Liquid line [ 6.35- 0.5m
Gas line [ 12-0.43m
Insulation [ 50 O.D
[ 32 I.D
for MSH-GA50VB
Liquid line [ 9.52- 0.5m
Gas line [ 12-0.43m
Insulation [ 50 O.D
[ 32 I.D
for MSH-GA60/GA80VB
325
{
791
56
253
Air out
19
162
58
Drain hose [16
(Connected part O.D)
Insulation [28
Power supply cord
Lead to right 2.0m
Lead to left 1.0m
Wireless remote controller
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Page 7
WIRING DIAGRAM
MSH-GA50VB - E1
MSH-GA60VB - E1
INDOOR UNIT
TO OUTDOOR
UNIT
CONNECTING
12V
MODELS WIRING DIAGRAM
HIC1
3
TB
N
POWER
SUPPLY
CORD
~/N 230V
50Hz
CN
151
BRN
BLU
CN
102
15
BLK
GRY
YLW
BRN
WHT
RED
3
CN
121
C11 1
F11
TAB12
BRN
RT12
CN112
NR11
3
2
1
BLU
L
2
1
CN201
RED
SR141
CN211
ELECTRONIC CONTROL CN
P.C. BOARD
111
CN
101
3
3
4
1
2
3
4
5
6
MF
RT11
3
PE
MV2 MV2 MV1
GRN/YLW
CIRCUIT
BREAKER
SYMBOL
DISPLAY
P.C.BOARD
RECEIVER
P.C.BOARD
REMOTE
CONTROLLER
NAME
SYMBOL
NAME
C11
INDOOR FAN CAPACITOR
MV1
VANE MOTOR (HORIZONTAL)
F11
FUSE (3.15A)
MV2
VANE MOTOR (VERTICAL)
DC/DC CONVERTER
NR11
VARISTOR
INDOOR FAN MOTOR (INNER FUSE)
RT11
ROOM TEMPERATURE THERMISTOR
HIC1
MF
SYMBOL
NAME
RT12
INDOOR COIL THERMISTOR
SOLID STATE RELAY
SR141
TERMINAL BLOCK
TB
NOTES: 1.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.
2.Use copper conductors only. (For field wiring)
3.Symbols below indicate.
: Connector
: Terminal block
MSH-GA80VB - E1
INDOOR UNIT
TO OUTDOOR
UNIT
CONNECTING
12V
MODEL WIRING DIAGRAM
3
TB
L
NR11
3
2
1
BLU
CN
151
CN
102
15
3
3
4
SR141
RT12
3
BLK
GRY
YLW
BRN
WHT
RED
CN
111
RT11
3
PE
CIRCUIT
BREAKER
SYMBOL
MV2 MV2 MV1
DISPLAY
P.C.BOARD
RECEIVER
P.C.BOARD
REMOTE
CONTROLLER
NAME
NAME
SYMBOL
C11
INDOOR FAN CAPACITOR
MV2
VANE MOTOR(VERTICAL)
F11
FUSE(3.15A)
NR11
VARISTOR
DC/DC CONVERTER
RT11
ROOM TEMPERATURE THERMISTOR
MF
INDOOR FAN MOTOR(INNER PROTECTOR)
RT12
INDOOR COIL THERMISTOR (MAIN)
MV1
VANE MOTOR(HORIZONTAL)
RT13
INDOOR COIL THERMISTOR (SUB)
HIC1
NOTES: 1.About the outdoor side 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
7
SYMBOL
SR141
TB
MF
CN211
ELECTRONIC CONTROL
P.C. BOARD
CN
101
BRN
BLU
CN
121
C11 1
F11
TAB12
BRN
RT13
CN112
CN201
RED
N
POWER
SUPPLY
CORD
~/N 230V
50Hz
4
3
2
1
HIC1
GRN/YLW
OB367-1.qxp
NAME
SOLID STATE RELAY
TERMINAL BLOCK
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REFRIGERANT SYSTEM DIAGRAM
MSH-GA50VB - E1
MSH-GA60VB - E1
INDOOR UNIT
INDOOR UNIT
Refrigerant pipe [15.88
(with heat insulator)
Refrigerant pipe [12.7
(with heat insulator)
Indoor
heat
exchanger
Indoor coil
thermistor
RT12
Distributor
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
Distributor
Flared connection
Refrigerant pipe [6.35
(with heat insulator)
Refrigerant pipe [6.35
(with heat insulator)
MSH-GA80VB - E1
INDOOR UNIT
Refrigerant pipe [15.88
(with heat insulator)
Indoor coil
thermistor
RT12(main)
Flared connection
Room temperature
thermistor
RT11
Flared connection
Indoor
heat
exchanger
Unit:mm
Flared connection
Indoor coil
thermistor
RT13(sub)
Room temperature
thermistor
RT11
Strainer
#50
Flared connection
Refrigerant pipe [9.52
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
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Page 9
SERVICE FUNCTIONS
MSH-GA50VB - E1
MSH-GA60VB - E1
MSH-GA80VB - E1
8-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.
The time will be shortened as follows.
Set time : 1 minute ➔ 1-second
Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit of JPG and JPS.)
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
Remote controller model : KM04A
NOTE : For remodelling, take out the batteries and press the
OPERATE/STOP(ON/OFF)button
twice or 3 times at first.
After finish remodelling, put back
the batteries then press the
RESET button.
J1
J2
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
Table 1
1 unit operation
2 units operation
3 units operation
4 units operation
No. 1 unit
No modification
Same as at left
Same as at left
Same as at left
No. 2 unit
–
Solder J1
Same as at left
Same as at left
No. 3 unit
–
–
Solder J2
Same as at left
No. 4 unit
–
–
–
Solder both J1 and J2
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the
remote controller for the indoor unit.
The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they are
set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
8-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are
memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment power
has restored after power failure.Then, the unit will restart automatically. However if the unit is operated in “I FEEL CONTROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided
by the initial room temperature.
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How to release “AUTO RESTART FUNCTION”
1Turn off the main power for the unit.
2Pull out the electronic control P.C. board, the receiver P.C.
board and the display P.C.board. (Refer to page 19.)
3Solder jumper wire to JR07 on the indoor
electronic control P.C. board. (Refer to page 18.)
C11
CN
21
1
CN201
SW1
RA102
CN151 CN121
CN111
CN112
TAB12
IC101
IC152
JR07
Operation
1If the main power has been cut, the operation settings remain.
2After the power is restored, the unit restarts automatically according to the memory.(However, it takes at least 3 minutes
for the compressor to start running.)
NOTE
•The operation settings are memorized when 10 seconds have passed after the remote controller was operated with the
remote controller.
•If main power is turned off or a power failure occurs while AUTO START/STOP timer is active ,the timer setting is
cancelled.
•If the unit has been off with the remote controller before power failure, the auto restart function does not work as the
power button of the remote controller is off.
•To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same
time.
•When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current
by adding to the system that allows the units to start one by one.
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Page 11
TROUBLESHOOTING
MSH-GA50VB - E1
MSH-GA60VB - E1
MSH-GA80VB - E1
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 first turn off the remote controller to stop the main unit, 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.
Housing point
Lead wiring
3. Troubleshooting procedure
(1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
(2) Before servicing check that the connector and terminal are connected properly.
(3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the
components for bursting and discolouration.
(4) When troubleshooting, refer to 9-2. and 9-3..
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
1 Remove the front lid and insert batteries.
2 Press the RESET button with tip end of ball point
Then reattach the front lid.
pen or the like, and then use the remote controller.
Insert the negative pole
of the batteries first.
Check if the polarity of
the batteries are correct.
RESET button
NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.
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Page 12
9-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
operates in
only Test Run
operation.
Check room
temperature
thermistor.
Refer to 9-6.
"Test point
diagram and
voltage".
Outdoor unit
doesn't
operate
even in
Test Run
operation.
Refer to
"Check of
outdoor unit".
Flash on and
off at 0.5second
intervals
Cause:
Indoor/
Outdoor unit
• Mis-wiring
2-time flash
Cause:
Indoor unit
• Trouble of
room temperature/
indoor coil
thermistor
Refer to
9-5. D
"How to
check
mis-wiring
(When
outdoor unit
doesn't
work)".
Check room
temperature
thermistor
and indoor
coil thermistor.
Refer to 9-6.
"Test point
diagram and
voltage".
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Outdoor unit
doesn't
stop even
if indoor unit
stops.
Refer to
"Check of
outdoor unit".
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Refer to
9-5. A
"Check of
indoor fan
motor".
Indoor unit
doesn't receive
the signal from
remote controller.
Refer to
"Check of
R.V. coil".
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
Refer to 9-5.B
"Check of
remote controller
and receiver
P.C. board".
1. Check indoor /
outdoor
connecting wire.
2. Refer to 9-5.C
"Check of indoor
electronic control
P.C. board".
7-time flash
6-time flash
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble of
outdoor
thermistor
control
in outdoor
system
unit
4-time flash
Cause:
Indoor unit
• Trouble of
indoor unit
control
system
Replace the
indoor
electronic
control
P.C. board.
Refer to
"Check of
outdoor
thermistor".
As for outdoor unit , refer to service manual OB368.
12
Replace the
deicer
P.C. board.
10-time flash
Cause:
Outdoor unit
MUH-GA80VB
• Trouble of
low discharge
temperature
protection
Refer to
"Check of
LEV".
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Page 13
9-3. Troubleshooting check table
• The following indication applies regardless of shape of the indicator.
Operation Indicator
Lighted
Not lighted
· Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible
abnormalities.
· The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation.
Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
Self check table
No.
Abnormal
point
Operation indicator lamp
0.5-second ON
1
Mis-Wiring
0.5-second OFF
Indoor coil
thermistor
2
Room
temperature
thermistor
2-time flash
3
Outdoor unit
does not
operate.
3 minutes after power supply turns ON, when
serial signal is not received.
• Refer to 9-5. D "How to check
mis-wiring ".
Detect Indoor coil/room temperature
thermistor short or open circuit every 8
seconds during operation.
• Refer to the characteristics of
main indoor coil thermistor,
sub indoor coil thermistor,
and room temperature
thermistor on page 18.
2.5-second OFF
Indoor fan
motor
2.5-second OFF
Indoor
4 control
system
Detection method
Outdoor unit
does not
operate.
3-time flash
4-time flash
Checkpoint
Symptom
Indoor fan repeats
When rotational frequency feedback signal is
12 seconds ON
and 3minutes OFF. not emitting during 12-second indoor fan
operation.
When the indoor
fan breaks, the fan
keeps stopping.
Outdoor unit
does not
operate.
• Refer to 9-5. A "Check of
indoor fan motor".
When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
• Check the indoor electronic
control P.C. board.
<Thermistor short>
Thermistors are abnormal when they short
after compressor start-up.
<Thermistor open>
Thermistors are abnormal when they open
after compressor start-up.
However, discharge temperature thermistor is
abnormal when open circuit is detected more
than 10 minutes after compressor start-up.
• Shortage of refrigerant
• Check the deicer P.C.
board.
Refer to "Check of outdoor
thermistor". Refer to service
manual OB368.
When it cannot properly read data in the
nonvolatile memory of the deicer P.C. board,
outdoor unit stops [and restarts 3 minutes
later(MUH-GA60VB).]
• Check the deicer P.C. board.
Refer to service manual
OB368.
MUH-GA80VB
When discharge temperature has been 50:
or less on cool operation, or has been 49: or
less on heat operation for 20 minutes.
MUH-GA80VB
• Refer to "Check of LEV".
• Check refrigerant circuit and
refrigerant amount.
Refer to service manual
OB368.
2.5-second OFF
6-time flash
5
Outdoor
thermistor
2.5-second OFF
Outdoor unit
does not
operate.
7-time flash
6
Outdoor
control
system
2.5-second OFF
Outdoor unit
does not
operate.
10-time flash
MUH-GA80VB
Low
7 discharge
temperature
protection
Outdoor unit
does not
operate.
2.5-second OFF
NOTE : When the indoor unit has started operation and the above detection method has detected an abnormality (the first
detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with the
OPERATION INDICATOR lamp flashing.
13
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Page 14
9-4. Trouble criterion of main parts
MSH-GA50VB - E1
MSH-GA60VB - E1
MSH-GA80VB - E1
Check method and criterion
Measure
the
resistance
with a tester.
Room temperature
(Part temperature 10˚C ~ 30˚C)
thermistor(RT11)
Normal
Abnormal
Indoor coil thermistor
Open or short-circuit
(RT12(main), RT13(sub))
8 k" ~ 20 k"
Measure the resistance between the terminals with a tester.
(Part temperature 10˚C ~ 30˚C)
Horizontal vane
motor(MV1)
Vertical vane
motor(MV2)
Normal
MSH-GA50/GA60VB MSH-GA80VB
132 " ~ 144 "
282 " ~ 305 "
152 " ~ 166 "
141 " ~ 152 "
MSH-GA50/GA60VB
MAIN
AUX
Abnormal
FUSE
BLK
BRN
YLW
GRY
RED
WHT
Open or
short-circuit
MSH-GA80VB
Measure the voltage power ON.
Color of lead wire
BRN – YLW
YLW – GRY
MAIN
Normal
4.5 ~ 5.5V
(When fan revolved one time)
0V➔5V➔0V
(Approx.)
Abnormal
P
Remain 0V or 5V
Measure the resistance between the terminal with a tester.
(Part temperature 10°C ~ 30°C)
Normal
282" ~ 306 "
AUX.
Abnormal
Open or short-circuit
RED
WHT
MSH-GA80VB
INNER
PROTECTOR
135i 5: OPEN
Color of
lead wire
WHT – BLK
BLK – RED
Figure
BLK
BRN
YLW
GRY
RED
MSH-GA50/GA60VB
INNER FUSE
145: CUT OFF
Sensor part
Indoor fan motor(MF)
Motor part
Part name
ROTOR
YLW
BRN
ORN
GRN
P :INNER PROTECTOR
14
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Page 15
9-5. Troubleshoot flow
When OPERATION INDICATOR lamp flashes 3-time.
Indoor fan motor doesn’t operate.
A Check of indoor fan motor
Turn OFF the power supply.
Check connector CN211 visually.
No
Are lead wires connected?
Yes
Is soldered point of the connector
correctly soldered?
No
Resolder it.
Yes
Reconnect the lead wires.
Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board.
Measure resistance between lead wires No.3 and No.4 and then No.1 and No.4.
Is resistance 0 (short circuit) or ∞ (open circuit)?
Yes ( 0 or ∞ )
No
(others)
Repair or replace the indoor fan motor.
Turn ON the power supply. Stop it if the unit operate.
Insert screwdriver into air outlet to rotate indoor fan
motor slowly for 1 revolution or over, and measure
voltage between No.2(+) and No.3(-) on CN121.
No
Does voltage repeat 0V DC and 5V DC?
Yes
Replace the indoor electronic control P.C. board.
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller.
B Check of remote controller and receiver P.C. board
w Check if the remote controller is exclusive for this air conditioner.
Switch on the remote controller.
Is LCD display on the the remote
controller visible?
No
Replace the batteries.(Refer to page 11.)
(not clear)
Yes
Remove the batteries, then set them back
and press the RESET button. Check if the
unit operates with the remote controller.
Does the unit operate with the
remote controller?
No
Turn on a radio to AM and press switch on
the remote controller.
Yes
No
OK
Is noise heard from radio?
Replace the remote controller.
Yes
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
Yes
● Reinstall the unit away from lights.
● Attach a filter on receiving part.
No
Measure the voltage between receiver P.C. board connector CN301 No.1(+) and No.3(-) when the remote
controller button is pressed.
Yes
Is the voltage approx. 4V DC?
No(5V or 0V DC)
Replace the receiver P.C. board.
15
Replace the indoor electronic control P.C.
board.
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04.10.14 1:20 PM
Page 16
The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.
C Check of indoor electronic control P.C. board
Check the both “parts side” and “pattern
side” of indoor electronic control P.C.
board visually.
Varistor (NR11)
Turn OFF the power supply.
Remove indoor fan motor connector CN211 and
vane motor connector CN151 from the indoor electronic
control P.C. board and turn ON the power supply.
Fuse (F11)
Indoor electronic
control P.C. board
Does the unit operate with the remote controller?
No
Does the OPERATION INDICATOR lamp light up
by pressing the EMERGENCY OPERATION switch?
Yes
Turn OFF the
power supply.
Replace the vane
motor.
Turn OFF the
power supply.
Yes
Replace the fuse.
Yes
Is winding
resistance of
vane motor 0 "?
Is fuse(F11) blown?
No
No
Is winding
resistance of
fan motor 0 "?
No
Is varistor(NR11) burnt?
Yes
Yes
Replace the fan
motor.
Replace the varistor.
16
No
Replace the indoor
electronic control
P.C. board.
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Page 17
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
Outdoor unit doesn’t operate.
D How to check mis-wiring
w Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self -check to be displayed in 3 seconds.
Start
• Turn ON the power supply. (indoor/ outdoor unit)
• Press once EMERGENCY OPERATION switch.
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.w
Yes
Make them sure.
Is this mis-wiring, poor contact,
or wire disconnection?
No
1. Turn OFF the power supply (indoor/ outdoor unit) and disconnect indoor and outdoor
connecting wire on indoor side.
2. Short-circuit terminal block N-3 by lead wire.
3. Turn ON the power supply (indoor unit) and press once EMERGENCY OPERATION switch.
Is there 20V DC between both ends of
R132 on the indoor electronic control P.C.
board ?
( By tester, the stylus is between 0 ~ 20V. )
No
Replace the indoor electronic
control P.C. board.
Yes
• Turn OFF the power supply. (indoor unit)
• Connect ON indoor/ outdoor connecting
wire.
Turn ON the power supply. (outdoor unit)
No
Is there 230V AC between L-N
on the outdoor terminal block?
Check the outdoor power supply
and connection of wiring.
Yes
Is there 5V DC between J205 + -J101 No
(MUH-GA50VB)/ J101 + -J401 - (MUH- GA60
/GA80VB) on the deicer P.C. board?
Replace the deicer P.C. board.
Yes
During EMERGENCY OPERATION, is there
10V DC between both ends of R601 on the
deicer P.C. board?
(By tester, the stylus is between 5 ~10V.)
Yes
Replace the deicer P.C. board.
As for outdoor unit, refer to service manual OB368.
17
No
Make the wiring between CN730
on the deicer P.C. board and
outdoor terminal block correct.
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Page 18
9-6. Test point diagram and voltage
MSH-GA50VB - E1 MSH-GA60VB - E1
Indoor electronic control P.C. board
MSH-GA80VB - E1
Fan motor power supply
}
Power supply input
230V AC
+
Fuse (F11)
250V AC 3.15A
} 5V DC
Room temperature thermistor(RT11)
Indoor coil
thermistor(RT12(main))
R132
MSH-GA80VB
Indoor coil
thermistor(RT13(sub))
Emergency operation
switch
Timer short mode point
(JPS, JPG)
(Refer to page 9.)
+
}
Receiver P.C. board
12V DC
Release of “Auto restart function”
Solder jumper wire to JR07.
(Refer to page 10.)
18
Resistance(k")
Indoor coil thermistor(RT12(main), RT13(sub))
Room temperature thermistor (RT11)
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10
Page 19
DISASSEMBLY INSTRUCTIONS
<"Terminal with lock mechanism" Detaching points>
In case of terminal with lock mechanism, detach the terminal as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism.
The terminal with no lock mechanism can be removed by pulling it out.
Check the shape of the terminal and work.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector is a terminal
with lock mechanism
Sleeve
Locking lever
MSH-GA50VB - E1
INDOOR UNIT
1Slide the sleeve.
2Pull the terminal while
pushing the locking
lever.
MSH-GA60VB - E1
1Hold the sleeve, and
pull out the terminal
slowly.
Connector
MSH-GA80VB - E1
OPERATING PROCEDURE
PHOTOS
1. Removing the front panel
(1) Remove the screw caps of the front panel.
Remove the screws.
(2) Pull the panel down to your side slightly and unhook the
catches at the top.
Photo 1
Front panel
Screws
2. Removing the electronic control P.C. board, the receiver
P.C. board and the display P.C. board
(1) Remove the front panel. (Refer to 1.)
(2) Remove the screw of the electrical cover.
Remove the electrical cover.
(3) Remove the screws of the V.A. clamp.
Remove the V.A. clamp.
(4) Remove the screw of the terminal block.
(5) Remove the screws of the ground wire.
(6) Disconnect all the connectors and all the lead wires on the
electronic control P.C. board.
(7) Remove the R.L holder.
(8) Remove the electronic control P.C. board.
(9) Open the R.L holder, remove the receiver P.C. board and
the display P.C. board.
Photo 2
Screws of the ground wire
Fan motor
connectors
Vane motor
connector
Indoor
electronic
control
P.C. board
Screw of
the electrical
cover
Receiver Screw of the
Screw of
R.L
V.A. clamp
holder the terminal P.C.
board
block
19
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04.10.14 1:20 PM
Page 20
OPERATING PROCEDURE
PHOTOS
3. Removing the electrical box
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical cover. (Refer to 2.)
(3) Disconnect the connector of the indoor coil thermistor.
(4) Disconnect the motor connector (CN211 and CN121) and
the vane motor connector (CN151) on the electronic
control P.C. board.
(5) Remove the screws of ground wire.
(6) Remove the fan motor lead wire and indoor coil thermistor
from the electrical box.
(7) Remove the lead wire of vane motor from the bottom of
electrical box.
(8) Remove the screw fixing the electrical box and remove the
electrical box.
Photo 3
4. Removing the vane motor
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical cover. (Refer to 2.)
(3) Remove the lead wire of vane motor. (Refer to 3.)
(4) Remove the R.L. holder.
(5) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
(6) Remove the screws of the vane motor and disconnect the
connector.
(7) Remove the vane motor.
Photo 4
Screws of the ground wire
Screw of the
electrical cover
Screw of the
electrical box
Vane motors
Photo 5 Screws of the
vane motor
Vane motor
5. Removing the line flow fan and the indoor fan motor
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical box. (Refer to 3.)
(3) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
(4) Remove the water cut.
(5) Slide the hole cover and remove the hole cover.
(6) Remove the hexagon socket set screw from the line flow
fan.
(7) Remove the screws fixing the fan motor and remove the
fan motor. (Be careful not to drop the fan motor because it
is heavy.)
(8) Remove the screws fixing the left side of the heat
exchanger.
(9) Lift the left side of the heat exchanger.
(10) Remove the line flow fan.
Photo 8
Photo 6
Screws fixing
the left side
of the heat
exchanger
Photo 7
Indoor
coil
thermistor
Water cut
Hole
cover
Screws fixing the fan motor
20
Screws
of the
vane
motor
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11
Page 21
PARTS LIST
MSH-GA50VB - E1 (WH)
MSH-GA60VB - E1 (WH)
MSH-GA80VB - E1 (WH)
11-1. INDOOR UNIT STRUCTURAL PARTS
11-2. INDOOR UNIT HEAT EXCHANGER
1
2
10
3
8
4
CATCH
Optional
11
parts
(See page 23.)
12
5
SCREW
CAP
6
7
11-1. INDOOR UNIT STRUCTURAL PARTS
Part number that is circled is not shown in the illustration.
NO.
1
2
3
4
5
6
7
8
9
Part Name
Part No.
E02
E02
E02
E02
E02
E02
E02
E02
E02
527
685
888
408
685
888
534
685
891
970
234
000
142
067
010
100
975
007
Symbol
in Wiring MSH-GA50
VB - E1
Diagram
(WH)
INSTALLATION PLATE
BOX (WH)
FRONT PANEL ASSEMBLY(WH)
CATCH
SCREW CAP (WH)
GRILLE (WH)
CATECHIN AIR FILTER
CORNER BOX RIGHT
LAMP PANEL
Q'ty/unit
MSH-GA60 MSH-GA80
VB - E1
VB - E1
(WH)
(WH)
1
1
1
4
3
1
2
1
1
1
1
1
4
3
1
2
1
1
1
1
1
1
1
4
3
1
2
1
1
Remarks
Including No.4,5,6
4PCS/ SET
3PCS/ SET
11-2. INDOOR UNIT HEAT EXCHANGER
E02
E02
E02
11
E02
E02
12
E02
10
891
893
179
138
151
527
620
620
667
666
667
667
INDOOR HEAT EXCHANGER
INDOOR HEAT EXCHANGER
UNION (GAS)
UNION (GAS)
UNION (LIQUID)
UNION (LIQUID)
1
1
1
1
1
1
1
21
{12.7
{15.88
{6.35
{9.52
OB367-1.qxp
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Page 22
MSH-GA50VB - E1 (WH)
MSH-GA60VB - E1 (WH)
MSH-GA80VB - E1 (WH)
11-4. ACCESSORY AND
REMOTE CONTROLLER
11-3. INDOOR UNIT FUNCTIONAL PARTS AND
ELECTRICAL PARTS
1
20
19
23
24
2
3
SLEEVE
BEARING
4
11
18
12
ROOM
TEMPERATURE
THERMISTOR
5
6
14
13
10
7
FUSE
8
9
VARISTOR
17
15 16
11-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
Part numbers that are circled are not shown in the illustration.
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Part No.
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
E02
527
408
001
408
527
685
685
127
817
527
817
527
448
408
817
527
528
527
891
892
893
527
819
749
527
528
529
302
509
504
702
235
040
041
382
385
034
300
300
303
303
333
333
329
468
452
452
452
308
375
307
307
034
034
Part Name
Symbol
in Wiring MSH-GA50
VB - E1
Diagram
(WH)
LINE FLOW FAN
BEARING MOUNT
SLEEVE BEARING
DRAIN HOSE
NOZZLE (WH)
VANE UPPER (WH)
VANE LOWER (WH)
FUSE
F11
VARISTOR
NR11
VANE CRANK SET
INDOOR FAN MOTOR ASSEMBLY
MF
INDOOR FAN MOTOR ASSEMBLY
MF
VANE MOTOR (VERTICAL)
MV2
VANE MOTOR (HORIZONTAL)
MV1
MOTOR BAND
MOTOR BAND
DISPLAY P.C. BOARD
RECEIVER P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
RT11
ROOM TEMPERATURE THERMISTOR
TB
TERMINAL BLOCK
RT12
INDOOR COIL THERMISTOR
RT12, RT13
INDOOR COIL THERMISTOR
VANE MOTOR SUPPORT SET(RIGHT)
VANE MOTOR SUPPORT SET(LEFT)
Q'ty/unit
MSH-GA60
VB - E1
(WH)
MSH-GA80
VB - E1
(WH)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
1
2
1
Remarks
3.15A
RC4V32 Including RUBBER MOUNT
RC4V40 Including RUBBER MOUNT
RIGHT & LEFT
UP & DOWN
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AUTO RESTART
Including No.16
AUTO RESTART
Including No.16
AUTO RESTART
Including No.16
11-4. ACCESSORY AND REMOTE CONTROLLER
23 E02 529 426
24 E02 527 083
REMOTE CONTROLLER
REMOTE CONTROLLER HOLDER
22
KM04A
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12
Page 23
OPTIONAL PARTS
AIR CLEANING FILTER
● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.
● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible.
● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.
● DO NOT reuse AIR CLEANING FILTER even if it is washed.
● DO NOT remove or attach AIR CLEANING FILTER during unit operation.
Model
MSH-GA50VB - E1
MSH-GA60VB - E1
MSH-GA80VB - E1
Part No.
MAC-1700FT
Air cleanig filter (White bellows type)
23
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Page 24
HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN
C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Oct. 2004. No.OB367 6
Made in Japan
New publication, effective Oct. 2004
Specifications subject to change without notice.