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MU-GA25VB-E1
Service Manual
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Mitsubishi MU-GA25VB-E1 user guide manual

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SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Models
Revision A:
• Another type of the electronic control P.C. board (TYPE 2) has been added to the original one (TYPE 1). They are both com­patible with MS/MSH-GE50VB-
Please void OBH529.
E1
.
No. OBH529
REVISED EDITION-A
MSC-GE20VB ­MSC-GE25VB ­MSC-GE35VB ­MS-GE50VB ­MSH-GE50VB -
E1
E1
E1
E1
E1
Outdoor unit service manual MU-GA•VB Series (OB386) MUH-GA•VB Series (OB387) MUX-A•VB Series (OB384) MXZ-A•WV Series (OB319) MU/MUH-GE•VB Series (OBH530)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 2
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ············· 10
9. MICROPROCESSOR CONTROL ··················· 14
10. TROUBLESHOOTING ····································· 22
11. DISASSEMBLY INSTRUCTIONS ···················· 33
PARTS CATALOG (OBB529)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Use the specifi ed refrigerant only
OBH529A
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
Revision A:
• Another type of the electronic control P.C. board (TYPE 2) has been added to the original one (TYPE 1). They are both com­patible with MS/MSH-GE50VB-
E1
.
1
MSC-GA20VB MSC-GA25VB MSC-GA35VB
1. Front panel has been changed.
MS-GA50VB
1. Indoor fan motor has been changed.
MSH-GA50VB
1. Indoor fan motor has been changed.
2
TECHNICAL CHANGES
-
E1
-
E1
-
E1
-
E1
E1
-
→
→
→
→
→
MSC-GE20VB MSC-GE25VB MSC-GE35VB
MS-GE50VB
(RC4V32-AA RC4V32-BA)
MSH-GE50VB
(RC4V32-AA RC4V32-BA)
E1
-
E1
-
E1
-
E1
-
E1
-
PART NAMES AND FUNCTIONS
MSC-GE20VB MSC-GE25VB MSC-GE35VB
Air cleaning filter(option) (White bellows type)
Front panel
Air inlet
Panel
Catechin air filter
Air outlet
Vertical vanes
Fan
Horizontal vane
Operation section
(When the front panel is opened)
Emergency operation switch
to Breaker
Power supply cord
Remote control receiving section
Remote controller
Display section
Operation indicator lamp
Remote control receiving section
2
MS-GE50VB MSH-GE50VB
OBH529A
Air cleaning filter (option) (White bellows type)
Panel
Catechin air filter
Vertical vanes
Horizontal vane
Operation section
(When the grille is opened)
Emergency operation switch
Front panel
Air inlet
To breaker
Power supply cord
Remote control
receiving section
Remote controller
Display section
Operation indicator lamp
Remote control
receiving section
ACCESSORIES
Installation plate
Installation plate fixing screw 4 25 mm
Remote controller holder
Fixing screw for 3.5 1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
MSC-GE20VB MSC-GE25VB MSC-GE35VB
1
5
1
2
2
1
1
MS-GE50VB
MSH-GE50VB
1
7
1
2
2
1
1
3
3
OBH529A
SPECIFICATION
Indoor model
Function
Power supply
Breaker capacity Running current Power input
Electrical
data
Power factor Model Fan motor current
Fan
motor
Dimensions W Weight
Air direction Air flow (High/Med./Low) Sound level (High/Med./Low) Fan speed (High/Med./Low)
Special
remarks
Fan speed regulator
Remote controller model
Indoor model
Function
Power supply
Breaker capacity
Running current Power input Power factor
Electrical data
Model Fan motor current
Fan
motor
Dimensions W H D
Weight
Air direction
Air flow Sound level
Special
remarks
Fan speed Fan speed regulator
Remote controller model
NOTE: Test conditions are based on ISO 5151. Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19 °C Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24 °C Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature - °C Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C Indoor-Outdoor piping length: 5 m
H D
(High/Med./Low)
(High/Med./Low)
(High/Med./Low)
A A
W
%
A
mm
kg
3
/h
m
dB
rpm
900/750/600
A
A W %
A
mm
kg
/h
dB
rpm
MSC-GE20VB
Cooling
Single phase
230 V, 50 Hz
RC4V19-JA
815
474/372/276
36/31/25
KM04F
MS-GE50VB
Cooling
Single phase
230 V, 50 Hz
RC4V32-BA
1,100 325 258
768/642/516
42/38/34
1,070/920/780
KM04B
Heating
10
0.17 35 90
0.17
278 244
9 5
510/420/342
36/31/25
950/820/700
3
0.3 60
87
0.3
16
5
3
MSC-GE25VB
Cooling
Single phase 230 V, 50 Hz
RC4V19-JA
815
474/384/306
36/31/25
900/770/650
MSC-GE35VB
Heating
10
0.17 35 90
0.17
278 244
9
5
588/456/342
39/32/25
1,050/870/700
3
KM04F
MSH-GE50VB
Cooling Heating
Single phase
230 V, 50 Hz
RC4V32-BA
1,100 325 258
768/642/516
42/38/34
1,070/920/780
582/444/324
930/760/600
1010
0.3 60
87
0.3
16
5
3
KM04A
Cooling
Single phase 230 V, 50 Hz
RC4V19-HA
815
40/33/26
10
0.19 40 92
0.19
278 244
10
5
606/498/396
960/830/700
3
KM04F
Heating
39/33/26
4
4
OBH529A
MSC-GE20VB
NOISE CRITERIA CURVES
SPL(dB
36
High
FUNCTIONFAN SPEED
COOLING
HEATING
Test conditions, Cooling : Dry-bulb temperature 27 Wet-bulb temperature19 Heating : Dry-bulb temperature 20 Wet-bulb temperature -
90
(A))LINE
SPL(dB
MSC-GE25VB
High
FUNCTIONFAN SPEED
COOLING
HEATING 39
(A))LINE
36
Test conditions, Cooling : Dry-bulb temperature 27 Wet-bulb temperature 19 Heating : Dry-bulb temperature 20 Wet-bulb temperature -
90
80
70
60
50
40
30
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
20
FUNCTIONFAN SPEED
COOLING
HEATING
NC-10
SPL(dB
40
39
(A))LINE
10
63 125 250 500 1000 2000 4000 8000
MSC-GE35VB
BAND CENTER FREQUENCIES, Hz
High
Test conditions. Cooling : Dry-bulb temperature 27 Wet-bulb temperature 19 Heating : Dry-bulb temperature 20 Wet-bulb temperature -
90
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
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-70
NC-60
NC-50
NC-40
NC-30
NC-20
NC-10
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-70
NC-60
NC-50
NC-40
NC-30
NC-20
NC-10
5
MS-GE50VB
OBH529A
High
FUNCTIONFAN SPEED
COOLING
(A))LINE
SPL(dB
42
Test conditions, Cooling : Dry-bulb temperature 27°C Wet-bulb temperature 19°C
90
SPL(dB
MSH-GE50VB
High
FUNCTIONFAN SPEED
COOLING
HEATING
(A))LINE
42
Test conditions, Cooling : Dry-bulb temperature 27 Wet-bulb temperature 19
Heating : Dry-bulb temperature 20 Wet-bulb temperature -
80
70
60
50
40
30
20
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
10
63 125 250 500 1000 2000 4000 8000
NC-10
BAND CENTER FREQUENCIES, Hz
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
80
70
60
50
40
30
20
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
10
63 125 250 500 1000 2000 4000 8000
NC-10
BAND CENTER FREQUENCIES, Hz
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
INDOOR UNIT
1m
0.8m
MICROPHONE
WALL
6
5
OBH529A
OUTLINES AND DIMENSIONS
MSC-GE20VB MSC-GE25VB
278
60
58
162
606
783
815
Installation plate
Indoor unit
149
19
Power supply cord Lead to right 1.0m Lead to left 0.3m
81.5
41
81.5
Air in
30
Air out
242 5
7 or more
244
326326
Installation plate
{
90
110
133.5
4.5
271
231.5
42
2.5
81.5
Wall hole 65
Liquid line 6.35-0.5m Gas line 9.52-0.43m Insulation 37 O.D 21 I.D
Drain hose 16 (Connected part O,D)
Insulation 28
Unit: mm
Wireless remote controller
MSC-GE35VB
278
60
58
162
606
783
815
Installation plate
Indoor unit
149
19
Power supply cord Lead to right 1.0m Lead to left 0.3m
41
Air in
30
Air out
242
7 or more
244
161.5161.5
326326
5
Installation plate
{
90
110
81.581.5
Wall hole 65
Liquid line 6.35-0.5m Gas line 9.52-0.43m Insulation 37 O.D 21 I.D
Drain hose 16 (Connected part O,D)
Insulation 28
2.5
218.5
42
Unit: mm
17.5
258
Wireless remote controller
7
MS-GE50VB
OBH529A
MSH-GE50VB
1068
Installation plate
98
Indoor unit
173
Unit: mm
7.5
255.547
315
325
56
58
162
Wireless remote controller
110 0
791
19
253
Power supply cord Lead to right 2.0 m Lead to left 1.0 m
47
98 173414.5 414.5
Wall hole 75
258
Air in
Air out
5
Installation plate
Liquid line 6.35- 0.5 m Gas line
{
Insulation
Drain hose 16 (Connected part O.D)
Insulation 28
2.5
12-0.43 m
50 O.D 32 I.D
8
6
OBH529A
MSC-GE20VB MSC-GE25VB MSC-GE35VB
WIRING DIAGRAM
MS-GE50VB
MSH-GE50VB
9
7
OBH529A
REFRIGERANT SYSTEM DIAGRAM
MSC-GE20VB MSC-GE25VB MSC-GE35VB
Refrigerant pipe 9.52 (with heat insulator)
Unit:mm
Indoor heat exchanger
Room temperature thermistor RT11
MS-GE50VB MSH-GE50VB
Indoor coil thermistor RT12
Flared connection
Flared connection
Refrigerant pipe 6.35 (with heat insulator)
Refrigerant pipe 12.7 (with heat insulator)
Indoor heat exchanger
Room temperature thermistor RT11
Indoor coil thermistor RT12 Distributor
Flared connection
Flared connection
Refrigerant pipe 6.35 (with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating (MSC,MSH)
10
8
OBH529A
SERVICE FUNCTIONS
MSC-GE20VB MS-GE50VB MSC-GE25VB MSH-GE50VB MSC-GE35VB
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. (Refer to 10-6.) 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 short-
ened 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:
NOTE: For modification, take out the batteries and press the OPERATE/STOP (ON/OFF) button 2 or 3 times at first.
After modification, put back the batteries then press the RESET button.
J2
J1
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
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
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 accept 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.
No modification
–
–
–
2 units operation
Same as at left
Solder J1
–
–
3 units operation
Same as at left
Same as at left
Solder J2
–
4 units operation
Same as at left
Same as at left
Same as at left
Solder both J1 and J2
8-3. REMOTE CONTROLLER (How to set the type) MSC-GE This remote controller setting needs to be switched according to the type of air conditioner (COOL & HEAT or COOL
ONLY). If the setting is incorrect, the air conditioner does not operate normally. Therefore, check if the setting corresponds to the type of-air conditioner. If not, correct the setting as shown below.
Slide switch
Type
COOL ONLYCOOL & HEAT
The position of the slide switch
11
8-4. MU & MUX TYPE/MUH & MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION
OBH529A
1. MU & MUX TYPE/MUH & MXZ TYPE SWITCH OVER <MSC-GE20VB MSC-GE25VB MSC-GE35VB>
The indoor units for MU & MUX type and MUH & MXZ type
are common specifications. Set switch according to the type of outdoor unit. The units are set for
MUH & MXZ type when they are shipped from the factory.
How to switch over MU & MUX TYPE/MUH & MXZ TYPE
(1) Turn OFF the main power for the unit. (2) Pull out the electronic control P.C. board, and change
switch (SW2- ) on the indoor electronic control P.C. board according to the type of outdoor unit as following figures.
(Refer to 10-6.)
Outdoor unit
MU & MUX type
Set switch upside.
Outdoor unit
MUH & MXZ type
Set switch downside.
SW2- sets the AUTO RESTART FUNCTION ON/OFF. SW2- switches over the MU & MUX type/MUH & MXZ type.
When the units are shipped from the factory, SW2 is as follows. SW2- : AUTO RESTART FUNCTION ON SW2- : MUH & MXZ type
L101
C11
CN201
CN211
CN151
CN121
CN112
SW1
SW2
F11
LD105
CN202
IC101
<MSC-GE20VB MSC-GE25VB MSC-GE35VB>
SW2 SW2
1 2
1 2
NOTE: • If the indoor-outdoor connecting wire is incorrectly
connected on the terminal block, the unit does not operate normally.
• If the earth is incorrect, it may cause an electric
shock.
12
}
FRONT
12
SW2
2. 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. “AUTO RESTART FUNCTION” automatically starts opera­tion in the same mode just before the shutoff of the main power. 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.
Operation
If the main power has been cut, the operation settings
remain.
After 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.)
How to disable “AUTO RESTART FUNCTION” MSC-GE20VB MSC-GE25VB MSC-GE35VB
(1) Turn OFF the main power for the unit. (2) Pull out the electronic control P.C. board, and change
switch (SW2- ) on the indoor electronic control P.C. board as following figures. (Refer to 10-6.)
AUTO RESTART
FUNCTION ON
Set switch downside.
AUTO RESTART
FUNCTION OFF
Set switch upside.
SW2 SW2
1 2
1 2
12
MS-GE50VB
OBH529A
MSH-GE50VB
(1)
Turn OFF the main power for the unit.
(2) Solder jumper wire to JR07 on the indoor electronic control
P.C. board. (Refer to 10-6.)
<MS-GE50VB MSH-GE50VB>
NOTE:
•
The operation settings are memorized when 10 seconds have passed after the indoor unit 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.
13
9
OBH529A
MICROPROCESSOR CONTROL
WIRELESS REMOTE CONTROLLER
MSC-GE20VB MSC-GE25VB MSC-GE35VB
Signal transmitting section
Operation display section
OPERATE /STOP (ON /OFF) button
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
RESET button
MS-GE50VB
Signal transmitting section
ON/OFF
ON/OFF
I FEEL
COOL
HEAT
DRY
/FAN
/
MODE
ECONO COOL
RESET
WARM
WARM
FAN
VANE
PM
AM
TOO
TOO
COOL
TEMPERATURE buttons
CLOCK
PM
AM
TOO
TOO
COOL
STOP
START
HR.
MIN.
CLOCK
OFF-TIMER button ON-TIMER button
HR. button
MIN. button
(TIME SET button)
CLOCK SET button
VANE CONTROL button
Operation display section
OPERATE/ STOP (ON/ OFF) button
VANE button
(Horizontal vane button)
OPERATION SELECT button
ECONO COOL button
WIDE VANE button
(Vertical vane button)
RESET button
ON/OFF
ON/OFF
I FEEL
COOL
VANE
FAN
DRY
MODE
WIDE VANE
ECONO COOL
LONG
RESET CLOCK
TOO
WARM
TOO
WARM
FAN
CLOCK
PM
AM
TOO
COOL
PM
AM
TOO
COOL
STOP
START
HR.
MIN.
TEMPERATURE buttons
FAN SPEED CONTROL button
OFF-TIMER button
ON-TIMER button
HR. button
MIN. button
(TIME SET button)
CLOCK SET button
LONG button
14
MSH-GE50VB
OBH529A
Signal transmitting section
Operation display section
OPERATE/STOP (ON/OFF) button
VANE button
(Horizontal vane button)
OPERATION SELECT button
ECONO COOL button
WIDE VANE button
(Vertical vane button)
RESET button
ON/OFF
ON/OFF
I FEEL
COOL
VANE
HEAT
DRY
MODE
WIDE VANE
ECONO COOL
LONG
RESET CLOCK
TOO
WARM
TOO
WARM
FAN
CLOCK
PM
AM
TOO
COOL
PM
AM
TOO
COOL
STOP
START
MIN.
FAN SPEED CONTROL button
HR.
TEMPERATURE buttons
OFF-TIMER button
ON-TIMER button
HR. button
MIN. button
(TIME SET button)
CLOCK SET button
LONG button
NOTE:
• The last setting will be stored after the unit is turned OFF with the remote controller.
• Indoor unit receives the signal of the remote controller with beeps.
INDOOR UNIT DISPLAY SECTION
OPERATION INDICATOR lamp
The OPERATION INDICATOR at the right side of the indoor unit indicates the operation state.
The following indication applies regardless of shape of the indicator.
Lighted
Not lighted
This shows that the air conditioner is operating to reach the target temperature. Please wait until the target temperature is obtained.
This shows that the room temperature is approaching the target temperature.
Difference between target
Operation stateIndication
temperature and room temperature
Approx. 2 or more
Approx. 2 or less
15
9-1. COOL ( ) OPERATION
OBH529A
ON with a beep tone.
1. Coil frost prevention
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works. The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor heat exchanger rises.
9-2. DRY ( ) OPERATION
The set temperature is determined from the initial room temperature.
<MU,MUX,MUH>
However, when the coil frost prevention works while the indoor fan is OFF, the indoor fan speed becomes set speed.
9-3. FAN( ) OPERATION <MU/MUX>
(1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone. (2) Select FAN mode with OPERATION SELECT button. (3) Select the desired fan speed. When AUTO, it becomes Low. Only indoor fan operates. Outdoor unit does not operate.
9-4. HEAT ( ) OPERATION <MUH>
Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2.
Defrosting starts when the temperature of outdoor heat exchanger becomes too low. The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts. This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
9-5."I FEEL CONTROL" ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone. (2) Select "I FEEL CONTROL" mode with OPERATION SELECT button. (3) The operation mode is determined by the room temperature at start-up of the operation.
Initial room temperature
<MUH>
25 or more
23 to 25
Less than 23
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
HEAT mode of
"I FEEL CONTROL"
16
<MUH>
OBH529A
<MUH>
17
9-6. AUTO VANE OPERATION
OBH529A
CONTROL or VANE
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the desired angle.
in the following case:
In FAN operation <MU,MUX> <MUH>
VANE CONTROL or VANE
VANE CONTROL or VANE
<MUH>
The horizontal vane position is set to Upward.
18
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2 C higher.
OBH529A
Also the horizontal vane swings in various cycles. SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air conditioner can keep comfort. As a result, energy can be saved. To cancel this operation, select a different mode or press one of the following buttons in ECONO COOL operation: ECONO COOL, VANE CONTROL, VANE or LONG button.
<MS-GE50 / MSH-GE50>
To cancel this operation, press one of the following buttons: ECONO COOL button in COOL mode, VANE or LONG button.
<MS-GE50 / MSH-GE50>
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the desired angle.
in the following case:
<MSH>
19
9-7. TIMER OPERATION
OBH529A
<MSH>
20
9-8. EMERGENCY/TEST OPERATION
OBH529A
The indoor fan runs at High speed and the temperature control does not work.
temperature of 24 °C.
/(HEAT MODE <MUH>) with a set
the test run or the
receives any signal from the remote controller. In case of latter, normal operation will start.
*Heat is a vailable only in MUH.
(and defrosting also <MUH>).
(or twice <MUH>) or the unit
9-9. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect compressor form overload.
21
10
OBH529A
TROUBLESHOOTING
MSC-GE20VB MS-GE50VB MSC-GE25VB MSH-GE50VB MSC-GE35VB
10-1. 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 after con-
firming 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.
<Incorrect>
<Correct>
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 OPERATION INDICATOR lamp is flashing ON and OFF before starting serv-
ice work. (2) Before servicing, check that the connector and terminal are connected properly. (3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration. (4) When troubleshooting, refer to 10-2. and 10-3.
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.
Remove the front lid and insert batteries.
Then reattach the front lid.
Insert the negative pole of the batteries first. Check if the polarity of the batteries is correct.
NOTE1: If the RESET button is not pressed, the remote controller may not operate correctly. NOTE2 : INFORMATION FOR MULTI SYSTEM AIR CONDITIONER
(OUTDOOR UNIT : MXZ type) Multi system air conditioner can connect two or more indoor units with one outdoor unit.
According to the capacity, two or more units can operate simultaneously.
•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units can­not operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same opera­tion mode.
Housing point
Operation Indicator
Press RESET button with a thin instrument, and
then use the remote controller.
RESET button
Lighted
Flashing
•When indoor units start the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 10 minutes) to blow out the warm air.
•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
NOTE3 : This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced. This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the
battery replacement.
NOTE4 : Do not use the leaking batteries.
22
10-2. INSTRUCTION OF TROUBLESHOOTING
OBH529A
Start
Indoor unit operates. Outdoor unit does not operate.
Outdoor unit operates only in “Test run operation”.
Check room temperature thermistor. Refer to 10-6. "Test point diagram and voltage".
MUH/MUX
Outdoor unit does not operate even in “Test run operation”.
Refer to "Check of outdoor unit".
Indoor unit operates. Outdoor unit does not operate normally.
Outdoor unit does not stop even if indoor unit stops.
MU
Check of wiring diagram of outdoor unit
MUH
Refer to "Check of outdoor unit".
MUH/MXZ
Unit does not operate normal operation in COOL or HEAT mode.
Refer to "Check of R.V. coil".
Indoor unit does not receive the signal from remote controller.
Indoor unit operates, when the EMERGENCY OPERATION switch is pressed.
Refer to 10-5. "Check of remote controller and receiver P.C. board".
OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF.
Indoor unit does not operate, when the EMERGENCY OPERATION switch is pressed.
1. Check indoor/ outdoor connecting wire.
2. Refer to 10-5. "Check of indoor electronic control P.C. board".
Indoor unit operates. But indoor unit does not blow out cool air.
MUX-2A28/2A59/3A60/ 3A63/2A70/4A73VB
Refer to "Check of indoor/outdoor units' connection and outdoor unit".
MUH/MXZ
Flash ON and OFF at 0.5­second intervals Cause: Indoor/ outdoor unit
• Mis-wiring/or trouble of serial signal
Refer to 10-5. or "How to check mis-wiring/ and serial signal error (When outdoor unit does not work)".
1.<The case of the trouble of the serial signal> When the power is turned off and turned on again, the indication shows “the trouble of mis-wiring”.
2."Test run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed. Refer to outdoor unit service manual.
2-time flash Cause: Indoor unit
• Trouble of room temp­ erature/ indoor coil thermistor
Check room temperature thermistor and indoor coil thermis­tor. Refer to 10-6. "Test point diagram and voltage".
3-time flash Cause: Indoor unit
• Trouble of indoor fan motor
Refer to 10-5. "Check of indoor fan motor".
4-time flash Cause: Indoor unit
• Trouble of indoor unit control system
Replace the indoor electronic control P.C. board.
MXZ
5-time flash Cause: Outdoor unit
• Outdoor power system abnormality
Refer to "Check of inverter/ compressor" and "Check of power supply".
MUH/MXZ
6-time flash Cause: Outdoor unit
• Trouble of thermistor in outdoor unit
Refer to "Check of outdoor thermistor" and others.
MUH/MXZ
7-time flash Cause: Outdoor unit
• Trouble of outdoor control system
Replace the deicer P.C. board and others.
10-time flash Cause: Outdoor unit
MXZ
• Outdoor refrigerant system abnormality
Refer to outdoor refrigerant system related items.
23
10-3. TROUBLESHOOTING CHECK TABLE
OBH529A
• Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and the following 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.
Lighted
· Flashing of the OPERATION INDICATOR lamp (the left-hand side lamp) indicates possible abnormalities.
Not lighted
Abnormal
No.
MUH-GA/ MXZ
Mis-wiring/ or Serial signal
1
MUH-GE
Mis-Wiring
Indoor coil thermistor
2
Room temperature thermistor
Indoor fan
3
motor
point
0.5-second ON
0.5-second OFF
0.5-second ON
0.5-second OFF
2-time flash
2.5-second OFF
3-time flash
2.5-second OFF
SymptomOperation indicator lamp Condition Remedy
• Check switch SW2- .(MU & MUX type or MUH & MXZ type)
Outdoor unit does not run.
Outdoor unit does not operate.
Outdoor unit does not operate.
Indoor fan repeats 12 seconds ON and 3minutes OFF. When the indoor fan breaks, the fan keeps stopping.
Serial signal from outdoor unit stops for 4 to 5 seconds.
3 minutes after power supply turns ON, serial signal is not received.
Indoor coil/room temperature thermistor detects short or open circuit every 8 seconds during operation.
The rotational frequency feedback signal is not emitted for 12 seconds after indoor fan motor is operated.
• Check wiring (visual check and conductivity check).
• Check indoor electronic control P.C.board.
• Check outdoor DEICER P.C. board and others.
• Check electrical parts.
• Refer to 10-5. "How to check mis-wiring ".
• Refer to the characteristics of indoor coil thermistor, and room temperature thermistor on 10-6.
• Refer to 10-5. "Check of indoor fan motor".
E
Indoor
4
control system
MXZ
Outdoor
5
power system
MUH/ MXZ
6
Outdoor thermistor
MUH/ MXZ
7
Outdoor control system
MXZ
Outdoor
8
refrigerant system error
MXZ
Operation
9
mode setting
4-time flash
2.5-second OFF
5-time flash
2.5-second OFF
6-time flash
2.5-second OFF
7-time flash
2.5-second OFF
10-time flash
2.5-second OFF
Operation Indicator
Lighted Flashing
2.5-second OFF
Outdoor unit does not operate.
Outdoor unit does not run.
Outdoor unit does not operate.
Outdoor unit does not operate.
Outdoor unit does not run.
Outdoor unit operates but indoor unit does not run.
It cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board.
The compressor operation is continuously three times interrupted by over current protection within 1 minute after start-up , it stops operation.
<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.
It cannot properly read data in the nonvolatile memory of the outdoor P.C. board.
The compressor operation has been interrupted by LEV protection continuously 5 minutes, the compressor stops operation.
The operation mode of each indoor unit is differently set to COOL(includes DRY) and HEAT at same time, the operation mode of indoor unit that has operated at first has the priority.
• Check the indoor electronic control P.C. board.
• Check the inverter output.
• Check the compressor.
• Shortage of refrigerant
• Check the deicer P.C. board and others. Refer to "Check of outdoor thermistor". Refer to outdoor service manual.
• Check the deicer P.C. board and others. Refer to outdoor service manual.
• Refer to "Check of LEV".
• Check refrigerant circuit and refrigerant amount.
• Check outdoor electronic control P.C. board. Refer to outdoor unit service manual.
• Unify the operation mode.
24
10-4. TROUBLE CRITERION OF MAIN PARTS
OBH529A
MSC-GE20VB MS-GE50VB MSC-GE25VB MSH-GE50VB MSC-GE35VB
Part name FigureCheck method and criterion
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12)
Indoor fan motor (MF)
MSC-GE20/25/35VB
INNER FUSE 145°C CUT OFF
MS-GE50VB MSH-GE50VB
INNER FUSE 140°C CUT OFF
Vane motor (MV) Horizontal vane motor (MV1) Vertical vane motor (MV2)
Measure the resistance with a tester. (Part temperature 10°C ~ 30°C)
Refer to 10-6. "Test point diagram and voltage", "Indoor electronic control P.C. board", for the chart of thermistor.
Measure the resistance between the terminals with a tester. (Part temperature 10°C ~ 30°C)
Color of
lead wire
Motor part
WHT – BLK
MSC-GE20/25VB
BLK – RED
Measure the voltage power ON.
Color of lead wire
BRN – YLW
YLW – GRY
Sensor part
Measure the resistance between the terminal with a tester. (Part temperature 10°C ~ 30°C)
MSC-GE20/25/35VB
240 Ω ~ 260 Ω
Normal
MSC-GE35VB
271 Ω ~ 295 Ω 180 Ω ~ 196 Ω
215 Ω ~ 233 Ω 305 Ω ~ 331 Ω
Normal
4.5 ~ 5.5V
(When fan revolved one time)
0V 5V 0V
(Approx.)
Normal
MS-GE50VB
MSH-GE50VB 283 Ω ~ 306 Ω
MS-GE50VB
MSH-GE50VB 284 Ω ~ 307 Ω 142 Ω ~ 154 Ω
MSC-GE20/25/35VB
FUSE
WHT
RED
BLK
YLW
GRY
BRN
MS-GE50VB MSH-GE50VB
MAIN
AUX
FUSE
BLK
YLW
BRN
GRY
RED
WHT
RED
YLW BRN
ROTOR
GRNORN
25
10-5. TROUBLESHOOTING FLOW
OBH529A
When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor does not operate.
A
Check of indoor fan motor
Turn OFF the power supply. Check connector CN211 visually.
No
Are lead wires connected?
Reconnect the lead wires.
Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board. Measure resistance between lead wires No.1 and No.5 and then No.3 and No.5 (MSC-GE20/25/35VB)/ No.3 and No.4 and then No.1 and No.4 (MS-GE50VB, MSH-GE50VB).
Is resistance 0 (short circuit) or (open circuit)?
Repair or replace the indoor fan motor.
Yes
Yes ( 0 or )
Is soldered point of the connector
correctly soldered?
Yes
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
No
(others)
voltage between No.2(+) and No.3(-) on CN121.
No
Does voltage repeat 0 V DC and 5 V DC?
Replace the indoor electronic control P.C. board.
No
Resolder it.
Yes
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote control­ler.
Check of remote controller and receiver P.C. board
B
Check if the remote controller is exclusive for this air conditioner.
Press OPERATE/STOP (ON/OFF) button on the remote controller.
Is LCD display on the remote con­troller visible?
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?
Yes
OK
No
(not clear)
No
Replace the batteries (Refer to 10-1.4.).
Turn ON a radio to AM and press OPERATE/STOP (ON/OFF) button on the remote controller.
Is noise heard from radio?
Yes
Are there any fluorescent lights of inverter or rapid-start type within the range of 1 m?
No
Measure the voltage between receiver P.C. board connector CN302 No.3(-) and No.5(+) (MSC-GE20/ 25/35VB)/CN301 No.1(+) and No.3(-) (MS-GE50VB, MSH-GE50VB) when the remote controller button is pressed (Refer to 10-6.).
Is the voltage approximately 4 V DC?
No (5 V or 0 V DC)
No
Yes
Yes
Replace the remote controller.
Reinstall the unit away from lights. Attach a filter on receiving part.
Replace the indoor electronic control P.C. board.
Replace the power monitor, receiver P.C board or the receiver P.C. board.
26
The unit does not operate with the remote controller. Also, the OPERATION INDICATOR lamp does not light up by
OBH529A
pressing the EMERGENCY OPERATION switch.
Check of indoor electronic control P.C. board
C
Check the both “parts side” and “pattern side” of indoor electronic control P.C. board visually.
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.
Does the unit operate with the remote controller? Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch?
Yes
Turn OFF the power supply.
Replace the vane motor.
Yes
Is winding resistance of vane motor 0 Ω?
No
Is winding resistance of fan motor 0 Ω?
Yes
Replace the fan motor.
Turn OFF the power supply.
No
No
Replace the fuse.
Yes
Is fuse (F11) blown?
No
Is varistor (NR11) burnt?
Yes
Replace the varistor.
Indoor electronic control P.C. board
No
Varistor (NR11)
Replace the indoor electronic control P.C. board.
27
When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time.
OBH529A
Outdoor unit does not operate.
How to check mis-wiring and serial signal error
Start
Turn OFF the power supply(indoor/outdoor unit).
Is the outdoor unit "MUH" or “MXZ” type?
Yes
•Turn ON the power supply(indoor/outdoor unit).
•Press once EMERGENCY OPERATION switch.
•3 min. later, check the self-check result displayed on OPERATION INDICATOR lamp on indoor unit. 2
MUH (Except MUH-GE50VB), MXZ
1 Set the switch(SW2- ) on indoor electronic control P.C. board to MU or MUX type, when the outdoor unit is MU or MUX type. If the setting is MUH or MXZ type, the unit does not work.
2 Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self-check to be displayed in 3 seconds.
No
Set the switch(SW2- ) on the indoor electronic control P.C. board to MU or MUX type. 1
Does the unit operate?
Serial signal error is indicated. (0.5-sec. ON, 0.5-sec. OFF)
Correct them.
Yes
Is this mis-wiring, poor contact, or disconnection of wire?
No
1. Turn OFF the power supply(indoor/outdoor unit) and disconnect indoor and outdoor connecting wire on indoor side.
2. Short-circuit between indoor terminal block and .
3. Turn ON the power supply
(indoor unit) and press once EMERGENCY OPERATION switch.
No
Refer to the "Instruction of troubleshooting."
Yes
OK
Is there 20V DC between both ends of R132 on indoor electronic control P.C. board ? ( By tester, the stylus is between 0 ~ 20V. )
Yes
•Turn OFF the power supply(indoor unit).
•Connect indoor and outdoor connecting wire.
Turn ON the power supply(outdoor unit).
Is there 230V AC between outdoor terminal block (TB1)?
Yes
Is there 5V DC between J205 + –J101 - on the deicer P.C. board?
Yes
Turn ON the power supply(indoor unit).
During EMERGENCY OPERATION, is there 10V DC between both ends of R601? (By tester, the stylus is between 5 ~10V)
Yes
Replace the deicer P.C. board.
No
No
No
Replace the indoor electronic control P.C. board.
Check the outdoor power supply, power supply cord and connection.
No
Replace the deicer P.C. board.
Correct the wiring between CN730 on the deicer P.C. board and outdoor terminal block.
Refer to outdoor unit service manual.
28
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
OBH529A
Outdoor unit does not operate.
How to check mis-wiring
E
• Turn ON the power supply. (indoor/outdoor unit)
• Press EMERGENCY OPERATION switch once.
After 3 minutes, mis-wiring is indicated (0.5-second ON, 0.5-second OFF) on OPERATION INDICATOR lamp on indoor unit.
Correct them.
Yes
1. Turn OFF the power supply (indoor/outdoor unit) and disconnect indoor and outdoor connecting wire on indoor side.
2. Short-circuit terminal block
3. Turn ON the power supply (indoor unit) and press EMERGENCY OPERATION switch once.
Is this mis-wiring, poor contact, or wire disconnection?
N - 3 by lead wire.
Is there 20 V DC between both ends of R132 on the indoor electronic control P.C. board ? ( By tester, the stylus is between 0 ~ 20 V. )
MUH-GE50VB
Start
No
Yes
Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds.
No
Replace the indoor electronic control P.C. board.
• Turn OFF the power supply.
• Connect indoor/outdoor connecting wire.
Turn ON the power supply(outdoor unit).
Is there 230 V AC between outdoor terminal block (TB1)?
Is there 5 V DC between J205 + –J101 - on the deicer P.C. board?
Turn ON the power supply(indoor unit).
During EMERGENCY OPERATION, is there 10 V DC between both ends of R601? (By tester, the stylus is between 5 ~10 V)
Replace the deicer P.C. board.
Refer to outdoor unit service manual.
Yes
Yes
Yes
(indoor unit)
No
Check the outdoor power supply and connection of wiring .
No
Replace the deicer P.C. board.
Make the wiring between CN730
No
on the deicer P.C. board and outdoor terminal block correct.
29
10-6. TEST POINT DIAGRAM AND VOLTAGE
OBH529A
MSC-GE20VB MSC-GE25VB MSC-GE35VB Indoor electronic control P.C. board
Fuse (F11)T3.15AL 250V
Power supply input 230 V AC
}
R132
Fan motor power supply (CN211)
Safety device of fan by horizontal vane CN1R1
Varistor (NR11)
J12
12 V
+
DC
{
–
J33
Power monitor, receiver P.C. board
J33
+
–
}
5 V DC
J23
}
SW2
(Refer to 8-4.)
CN121
Indoor coil thermistor (RT12) Room temperature thermistor (RT11)
Vane moter power supply (CN151)
sets the "Auto restart
function" ON/OFF.
switches over MU & MUX type/ MUH & MXZ type.
Room temperature thermistor RT11
Indoor coil thermistor RT12
Timer short mode point JPG, JPS (Refer to 8-1.)
Emergency operation switch
CN302
Resistance (k )
Temperature ( )
30
MS-GE50VB
OBH529A
MSH-GE50VB
Indoor electronic control P.C. board
TYPE 1
NOTE: There are two types of electronic control P.C.
boards (TYPE 1/TYPE 2). They are both compatible with MS/MSH-GE50VB
.
Fan motor power supply (CN211)
Power supply input
}
230 V AC
5 V DC
}
+
Fuse (F11) T3.15AL250V
R132
Receiver P.C. board
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12)
CN121
Vane moter power supply (CN151)
Emergency operation switch
Timer short mode point (JPS, JPG) (Refer to 8-1.)
+
}
12V DC
Indoor coil thermistor (RT12) Room temperature thermistor (RT11)
CN301
To disable “Auto restart function”, solder jumper wire to JR07. (Refer to 8-4.2.)
Resistance(kΩ)
31
MS-GE50VB
OBH529A
MSH-GE50VB
Indoor electronic control P.C. board
TYPE 2
Fan motor power supply (CN211)
Power supply input
}
230 V AC
Fuse (F11) T3.15AL250V
R132
+
12 VDC
To disable “Auto restart function”, solder jumper wire to JR07. (Refer to 8-4.2.)
{
+
5 VDC
}
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12)
CN121
Vane motor power supply (CN151)
Emergency operation switch
Timer short mode point (JPS, JPG) (Refer to 8-1.)
Receiver P.C. board
Indoor coil thermistor (RT12) Room temperature thermistor (RT11)
)
CN301
Resistance(k
32
11
OBH529A
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. (2) The terminal with this connector has the locking
Sleeve
mechanism.
Slide the sleeve. Pull the terminal while
Locking lever
pushing the locking lever.
11-1. MSC-GE20VB MSC-GE25VB MSC-GE35VB
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.
2. Removing the electronic control P.C. board and the power monitor, receiver P.C. board
NOTE : In case of removing only indoor electronic control
P.C. board, work (3) is not necessary. (1) Remove the front panel. (Refer to 1.) (2) Remove the power monitor, receiver P.C. board holder
from the bottom of electrical box. (3) Open the power monitor, receiver P.C. board holder and
remove the power monitor, receiver P.C. board.
(4) Remove the screw of the electrical cover and the electrical
cover. (5) Remove the screw of the V.A. clamp and the V.A. clamp. (6) Remove the screw of the cord clamp and the cord clamp. (7) Remove the screw of the terminal block. (8) Remove the screw of the earth wire. (9) Pull out indoor electronic control P.C. board slightly. (10)
Disconnect all the connectors on the electronic control P.C.
board. (11)
Remove the electronic control P.C. board and the power
monitor, receiver P.C. board.
Photo 1
Photo 2
Screw of the earth wire
Hold the sleeve, and pull out the terminal slowly.
Connector
NOTE: Turn OFF power supply before disassembly.
Screws of the front panel
Terminal block fixing screw
Indoor electronic control P.C. board
Cord clamp fixing screw
Screw of the V.A. clamp
Screw of the electrical cover
Power monitor, receiver P.C. board holder
33
OPERATING PROCEDURE
OBH529A
PHOTOS
3. Removing the electrical box
(1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Remove the V.A. clamp. (Refer to 2.) (4) Remove the cord clamp. (Refer to 2.) (5) Remove the terminal block. (Refer to 2.) (6) Remove the screw of earth wire. (Refer to 2.) (7) Disconnect the connector of the indoor coil thermistor
(CN112), the fan motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C. board.
(8) Remove the fan motor lead wire and indoor coil thermistor
from the electrical box.
(9) Remove the lead wire of vane motor from the bottom of
electrical box.
(10)
Remove the screw fixing the electrical box, remove the
electrical box.
4. Removing the nozzle assembly and the vane motor
(1) Remove the front pane and the corner box. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) Pull out the drain hose from the nozzle assembly, remove
the nozzle assembly. (4) Remove the screws of the vane motor, disconnect the vane motor connector. (5) Remove the vane motor.
Photo 3
Photo 4
Indoor coil thermistor connector
Fan motor connector
Screws of the vane motor
Vane motor connector
Screw of the electrical box
5. Removing the indoor fan motor and the line flow fan
(1) Remove the front panel the corner box. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) Pull out the drain hose from the nozzle assembly, remove
the nozzle assembly. (Refer to 4.) (4) Remove the screw of the lead cover and lead cover. (5) Release the hooks to open the motor band slightly. (6) Loosen the hexagon socket set screw from the line flow
fan. (7) Remove the screws fixing the motor bed, remove the fan
motor with motor band and the motor bed. (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 6
Screw of the lead cover
Hexagon socket set screw
Hooks of the motor band
Drain hose
Photo 5
Screws of the left side of the heat exchanger
Photo 7
Screws of the motor bed
34
11-2. MS-GE50VB MSH-GE50VB
OBH529A
OPERATING PROCEDURE PHOTOS
1. Removing the panel
(1) Remove the screw caps of the panel. Remove the screws of the panel. (2) Pull the panel down to your side slightly and unhook the
catches at the top. (3) Remove the screw of the corner box. Remove the corner box.
NOTE: Turn OFF power supply before disassembly.
Photo 1
2. Removing the electronic control P.C. board, the receiver P.C. board and the display P.C. board
(1) Remove the panel and the corner box. (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 earth 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.
3. Removing the electrical box
(1) Remove the panel and the corner box. (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 earth 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 of the electrical box and remove the
electrical box.
Photo 2
R.L holder
Photo 3
Screws of the panel
Screws of the earth wire
Screw of the terminal block
Screws of the earth wire
Receiver P.C. board
Screw of the corner box
Fan motor connectors
Vane motor connector
Indoor electronic control P.C. board
Screw of the electrical
cover
Screw of the
V.A. clamp
Screw of the electrical cover
Screw of the electrical box
35
OPERATING PROCEDURE
PHOTOS
4. Removing the vane motor
(1) Remove the panel and the corner box. (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 5
5. Removing the line flow fan and the indoor fan motor
(1) Remove the panel and the corner box. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) Pull out the drain hose from the nozzle assembly and
(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
(7) Remove the screws of the fan motor and remove the fan
(8) Remove the screws of the left side of the heat exchanger. (9) Lift the left side of the heat exchanger.
10
(
Screws of the
vane motor
Vane motor
remove the nozzle assembly.
fan.
motor. (Be careful not to drop the fan motor because it is heavy.)
) Remove the line flow fan.
Photo 4
Vane motors
Photo 6
Screws of the left side of the heat exchanger
Photo 7
Indoor coil thermistor
Screws of the vane motor
Photo 8
Hole cover
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Aug. 2011. No.OBH529 REVISED EDITION-A Distributed in Dec. 2008. No.OBH529 5 Made in Japan
Water cut
Screws of the fan motor
New publication, effective Aug. 2011 Specifications subject to change without notice.
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