Mitsubishi Electric MSC-GE20VB User manual

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
8. SERVICE FUNCTIONS ····································11
9. MICROPROCESSOR CONTROL ··················· 14
10. TROUBLESHOOTING····································· 22
11. DISASSEMBLY INSTRUCTIONS ···················· 33
MSC-GE20VB - E1
MSC-GE25VB - E1
MSC-GE35VB - E1
MS-GE50VB -E1
MSH-GE50VB - E1
SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Models
INDOOR UNIT
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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)
No. OBH529
REVISED EDITION-A
PARTS CATALOG (OBB529)
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 com-
patible with MS/MSH-GE50VB- E1 .
Please void OBH529.

2
TECHNICAL CHANGES
1
PART NAMES AND FUNCTIONS
2
MSC-GA20VB - E1 →MSC-GE20VB - E1
MSC-GA25VB - E1 →MSC-GE25VB - E1
MSC-GA35VB - E1 →MSC-GE35VB - E1
1. Front panel has been changed.
MS-GA50VB - E1 →MS-GE50VB - E1
1. Indoor fan motor has been changed. (RC4V32-AA RC4V32-BA)
MSH-GA50VB - E1 →MSH-GE50VB - E1
1. Indoor fan motor has been changed. (RC4V32-AA RC4V32-BA)
Emergency operation switch
Fan
Air outlet
Vertical vanes
Air inlet
to Breaker
Remote control
receiving section
Display section
Air cleaning filter(option)
(White bellows type)
Front panel
Power supply cord
Panel
Horizontal vane
Operation section
(When the front panel is opened)
Remote controller
Operation indicator lamp
Remote control
receiving section
Catechin air filter
MSC-GE20VB MSC-GE25VB MSC-GE35VB
Use the specified refrigerant only
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 com-
patible with MS/MSH-GE50VB- E1 .
OBH529A

3
Front panel
(When the grille is opened)
Remote controller
Operation section Display section
Emergency operation switch
Operation indicator lamp
Air inlet
To breaker
Power supply cord
Remote control
receiving section
Air cleaning filter (option)
(White bellows type)
Horizontal vane
Vertical vanes
Catechin air filter
Remote control
receiving section
Panel
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)
1
7
1
2
2
1
1
MS-GE50VB
MSH-GE50VB
1
5
1
2
2
1
1
MSC-GE20VB
MSC-GE25VB
MSC-GE35VB
MS-GE50VB MSH-GE50VB
OBH529A

4
SPECIFICATION
3
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
Indoor model
Function
Power supply
Air flow (High/Med./Low)
Running current
Power input
Power factor
Fan motor current
Model
Dimensions W H D
Weight
Air direction
Sound level
(High/Med./Low)
Fan speed (High/Med./Low)
Fan speed regulator
Remote controller model
Fan motor Electrical data
Special remarks
Cooling Heating
Single phase
230 V, 50 Hz
768/642/516
768/642/516
0.3
60
87
0.3
RC4V32-BA
1,100 325 258
16
5
42/38/34
1,070/920/780
1,070/920/780
3
KM04A
/h
A
Breaker capacity 1010
A
W
%
A
mm
kg
dB
rpm
MSH-GE50VB
Cooling
Single phase
230 V, 50 Hz
0.3
60
87
0.3
RC4V32-BA
1,100 325 258
16
5
42/38/34
3
KM04B
MS-GE50VB
Breaker capacity
Running current
Power input
Power factor
Model
Fan motor current
Dimensions W H D
Weight
Air direction
Air flow (High/Med./Low)
Sound level (High/Med./Low)
Fan speed (High/Med./Low)
Fan speed regulator
Remote controller model
A
A
W
%
A
mm
kg
m3/h
dB
rpm
MSC-GE20VB
Single phase
230 V, 50 Hz
Single phase
230 V, 50 Hz
Single phase
230 V, 50 Hz
10
0.17
35
90
RC4V19-JA
0.17
815 278 244
9
5
3
KM04F
Cooling
474/372/276
36/31/25
900/750/600
Heating
510/420/342
36/31/25
950/820/700
MSC-GE25VB
10
0.17
35
90
RC4V19-JA
0.17
815 278 244
9
5
3
KM04F
Cooling
474/384/306
36/31/25
900/770/650
Heating
588/456/342
39/32/25
1,050/870/700
MSC-GE35VB
10
0.19
40
92
RC4V19-HA
0.19
815 278 244
10
5
3
KM04F
Cooling
582/444/324
40/33/26
930/760/600
Heating
606/498/396
39/33/26
960/830/700
Electrical data
Fan motor
Special remarks
Indoor model
Function
Power supply
OBH529A

5
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-10
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27 Wet-bulb temperature19
Heating : Dry-bulb temperature 20 Wet-bulb temperature -
MSC-GE20VB
COOLING
High
FUNCTIONFAN SPEED
36
HEATING
SPL(dB(A)) LINE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-10
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27 Wet-bulb temperature 19
Heating : Dry-bulb temperature 20 Wet-bulb temperature -
MSC-GE25VB
COOLING
High
FUNCTIONFAN SPEED
36
HEATING 39
SPL(dB(A)) LINE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-10
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions.
Cooling : Dry-bulb temperature 27 Wet-bulb temperature 19
Heating : Dry-bulb temperature 20 Wet-bulb temperature -
MSC-GE35VB
COOLING
FUNCTIONFAN SPEED
40
HEATING
High
39
SPL(dB(A)) LINE
OBH529A

6
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-10
NC-70
Test conditions,
Cooling : Dry-bulb temperature 27 Wet-bulb temperature 19
Heating : Dry-bulb temperature 20 Wet-bulb temperature -
COOLING
FUNCTIONFAN SPEED
42
HEATING
High
SPL(dB(A)) LINE
MSH-GE50VB
INDOOR UNIT
WALL
MICROPHONE
0.8m
1m
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-10
NC-70
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27°C Wet-bulb temperature 19°C
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
COOLING
FUNCTIONFAN SPEED
42
High
SPL(dB(A)) LINE
MS-GE50VB
OBH529A

7
OUTLINES AND DIMENSIONS
5
MSC-GE20VB
MSC-GE25VB
244
242 5
7 or more
90
110
30
149
606
278
60
815
783
Power supply cord
Lead to right 1.0m
Lead to left 0.3m
Air out
Installation plate
Insulation 28
Drain hose 16
(Connected part O,D)
Air in
Liquid line 6.35-0.5m
Gas line 9.52-0.43m
Insulation 37 O.D
21 I.D
{
Wireless remote controller
162
19
58
81.5
81.5
41
2.5
42
271
231.5
4.5
81.5 133.5
326326
Wall hole 65
Indoor unit
Installation plate
Unit: mm
244
242
218.5
258
81.581.5
41
42
2.5
17.5
161.5161.5
326326
5
7 or more
90
110
30
149
606
278
60
815
783
Power supply cord
Lead to right 1.0m
Lead to left 0.3m
Air out
Indoor unit
Installation plate
Wall hole 65
Installation plate
Insulation 28
Drain hose 16
(Connected part O,D)
Liquid line 6.35-0.5m
Gas line 9.52-0.43m
Insulation 37 O.D
21 I.D
{
Wireless remote controller
162
19
58
Air in
MSC-GE35VB Unit: mm
OBH529A

8
258
162
19
58
47
7.5
315
255.547
2.5
98 173
98 173414.5 414.5
5
253
791
56
1068
1100
325
Air out
Air in
Insulation 28
Drain hose 16
(Connected part O.D)
Installation plate
Wall hole 75
Wireless remote controller
Installation plate Indoor unit
{
Liquid line 6.35- 0.5 m
Gas line 12-0.43 m
Insulation 50 O.D
32 I.D
Power supply cord
Lead to right 2.0 m
Lead to left 1.0 m
MS-GE50VB
MSH-GE50VB
Unit: mm
OBH529A

9
WIRING DIAGRAM
6
MS-GE50VB
MSH-GE50VB
MSC-GE20VB MSC-GE25VB MSC-GE35VB
OBH529A

10
REFRIGERANT SYSTEM DIAGRAM
7
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe 9.52
(with heat insulator)
Unit:mm
Indoor coil
thermistor
RT12
Flared connection
Flared connection
Refrigerant pipe 6.35
(with heat insulator)
MS-GE50VB MSH-GE50VB
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe 12.7
(with heat insulator)
Flared connection
Flared connection
Indoor coil
thermistor
RT12
Refrigerant pipe 6.35
(with heat insulator)
Distributor
Refrigerant flow in cooling
Refrigerant flow in heating (MSC,MSH)
MSC-GE20VB MSC-GE25VB MSC-GE35VB
OBH529A

11
SERVICE FUNCTIONS
8
Table 1
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
1 unit operation
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
8-2. 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:
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.)
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.
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.
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
Slide switch Type
The position
of the slide
switch
COOL ONLYCOOL & HEAT
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.
MSC-GE20VB MS-GE50VB
MSC-GE25VB MSH-GE50VB
MSC-GE35VB
OBH529A

12
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.)
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.
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
}
SW2
FRONT
12
12
IC101
CN151
SW1
CN112
CN121
L101
CN201
F11
CN202
C11
CN211
SW2
LD105
<MSC-GE20VB MSC-GE25VB MSC-GE35VB>
8-4. MU & MUX TYPE/MUH & MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION
1 2
1 2 SW2 SW2
Outdoor unit
MUH & MXZ type
Set switch downside.
Outdoor unit
MU & MUX type
Set switch upside.
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.
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.)
1 2 SW2 SW2
1 2
AUTO RESTART
FUNCTION ON
Set switch downside.
AUTO RESTART
FUNCTION OFF
Set switch upside.
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 opera-
tion 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.
OBH529A

13
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.
<MS-GE50VB MSH-GE50VB>
MS-GE50VB
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.)
OBH529A

14
MICROPROCESSOR CONTROL
9
WIRELESS REMOTE CONTROLLER
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL COOL
DRY
PM
CLOCK
AM
RESET CLOCK
HEAT
/FAN
/
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF) button
TEMPERATURE buttons
OPERATION SELECT button
FAN SPEED CONTROL button OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE CONTROL button
CLOCK SET button
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
WIDE VANE
LONG
I FEEL COOL
DRY
PM
CLOCK
AM
RESET CLOCK
OPERATION SELECT button
FAN SPEED CONTROL button
OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE button
(Horizontal vane button)
CLOCK SET button
LONG button
WIDE VANE button
(Vertical vane button)
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
FAN
Signal transmitting section
Operation display section
OPERATE/ STOP
(ON/ OFF) button
TEMPERATURE buttons
MS-GE50VB
MSC-GE20VB MSC-GE25VB MSC-GE35VB
OBH529A

15
Approx. 2
or more
Difference
between target
temperature
and room
temperature
Approx. 2
or less
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.
Operation stateIndication
OPERATION INDICATOR lamp
The OPERATION INDICATOR at the right side of the indoor
unit indicates the operation state.
INDOOR UNIT DISPLAY SECTION
The following indication applies regardless of
shape of the indicator.
Lighted
Not lighted
MSH-GE50VB
HEAT
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
WIDE VANE
LONG
I FEEL COOL
DRY
PM
CLOCK
AM
RESET CLOCK
OPERATION SELECT button
FAN SPEED CONTROL button
OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE button
(Horizontal vane button)
CLOCK SET button
LONG button
WIDE VANE button
(Vertical vane button)
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
Signal transmitting section
Operation display section
OPERATE/STOP
(ON/OFF) button
TEMPERATURE buttons
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.
OBH529A

16
The set temperature is determined from the initial room temperature.
9-1. COOL ( ) OPERATION
9-2. DRY ( ) OPERATION
<MU,MUX,MUH>
9-4. HEAT ( ) OPERATION <MUH>
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.
ON with a beep tone.
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.
9-3. 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.
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.
Cold air prevention control
However, when the coil frost prevention works while the indoor fan is OFF, the indoor fan speed becomes set speed.
Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
HEAT mode of
"I FEEL CONTROL"
Initial room temperature
<MUH>
25 or more
23 to 25
Less than 23
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.
OBH529A

17
<MUH>
<MUH>
OBH529A

18
CONTROL or VANE
9-6. AUTO VANE OPERATION
The horizontal vane position is set to Upward.
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>
OBH529A

19
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2 C higher.
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.
<MSH>
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:
<MS-GE50 / MSH-GE50>
OBH529A

20
<MSH>
9-7. TIMER OPERATION
OBH529A