Mitsubishi Electric MCF-GA35VB User manual

SERVICE MANUAL
CONTENTS
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 ············································6
7. REFRIGERANT SYSTEM DIAGRAM················7
8. SERVICE FUNCTIONS ······································8
9. TROUBLESHOOTING······································10
10. DISASSEMBLY INSTRUCTIONS·····················15
11. PARTS LIST······················································17
12. OPTIONAL PARTS···········································19
Wireless type
Models
MCF-GA35VB - (WH)
MCF-GA50VB - (WH)
MCF-GA60VB - (WH)
E1
E1
E1
No. OB382
(When installed on the ceiling)
(When installed on the floor)
FLOOR AND CEILING TYPE AIR CONDITIONERS
Indication of
model name
MCF-GA35VB -
MCF-GA50VB -
MCF-GA60VB - E1
E1
E1
NOTE:
• This service manual describes technical data of indoor units
• As for outdoor units MUCF-GA35VB - ,MUCF-GA50VB - and MUCF-GA60VB - , refer to
the service manual OB383. E1E1E1
OB382--1.qxp 04.12.21 16:45 Page 1

TECHNICAL CHANGES
2
1
PART NAMES AND FUNCTIONS
INDOOR UNIT
MCF-GA35VB - MCF-GA50VB - MCF-GA60VB - E1E1E1
(When installed on the floor)
(When the air inlet grille is opened.)
Deodorizing filter
(Gray sponge type)(option)
Air filter
Remote controller
Air inlet
Operation section
Air cleaning filter
(White bellows type)(option)
Front panel
Receiving section
Operation indicator lamp
Horizontal vane
Vertical vanes
Emergency
operation switch
(When installed on the ceiling)
ACCESSORIES
Item
Installation plate
Unit fixing screw
5 o12mm
Wireless remote
controller
Remote controller
holder
Fixing screw for
3.5 o16mm (Black)
Battery (AAA) for
remote controller
Drain hose
Drain pipe cover
Knockout cover
Screw for 4 o10mm
2
2
1
1
2
2
1
1
1
2
Q'ty
2
MCF-A12WV - ➔MCF-GA35VB -
1. Model name has been changed.
MCF-A18WV - ➔MCF-GA50VB -
1. Model name has been changed.
MCF-A24WV - ➔MCF-GA60VB -
1. Model name has been changed.
E1E1
E1E1
E1E1
OB382--1.qxp 04.12.21 16:45 Page 2

3
MCF-GA35VB - MCF-GA50VB - MCF-GA60VB - E1E1E1
REMOTE CONTROLLER
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
PM
CLOCK
AM
RESET CLOCK
FAN
ECONO COOL
ECONO COOL button
Open the front lid.
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 VANE CONTROL button
CLOCK SET button
Indication of remote controller model
is on back.
OB382--1.qxp 04.12.21 16:45 Page 3

SPECIFICATION
4
3
Indoor model
Function
Power supply
Air flow (High/Med.W/LowW)
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/LowW)
Fan speed
(High/Med.W/LowW)
Fan speed regulator
Thermistor RT11(at 25:)
Thermistor RT12(at 25:)
Remote controller model
K/h
A
A
W
A(kW)
%
A
"
mm
kg
dB
rpm
k"
k"
MCF-GA50VB - E1
Cooling
Single phase
230V, 50Hz
780 / 636W/ 492W
10
0.30
66
96
0.30
RB4V25-AC
WHT-BLK 182.2 BLK-YLW 68.9
YLW-BLU 47.5 BLU-BRN 31.5
BRN-RED 22.9
1,100O650O180
25
5
46 /41W/36W
1,240 /1,060W/845W
3
10
10
KM04N
MCF-GA60VB - E1
Cooling
Single phase
230V, 50Hz
840/ 744W/ 642W
0.36
80
97
0.36
RB4V36-DB
WHT-BLK 84 BLK-YLW 46.2
YLW-BLU 37.2 BLU-BRN 45.2
BRN-RED 13.6
48 /45W/42W
1,320 /1,190W/1,060W
Electrical data
Fan motor
Special remarks
Capacity
MCF-GA35VB - E1
Cooling
Single phase
230V, 50Hz
678 /582W/474 W
0.26
56
94
0.26
RB4V19-AC
WHT-BLK 203.2 BLK-YLW 45.9
YLW-BLU 32.7 BLU-BRN 44.4
BRN-RED 23.3
44 /40W/34W
1,105 /970W/820W
NOTE:Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB(24°C)
Indoor-Outdoor piping length : 5m
WReference value
OB382--1.qxp 04.12.21 16:45 Page 4

5
NOISE CRITERIA CURVES
4
NOISE CRITERIA CURVES
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-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Test conditions,
Cooling : Dry-bulb temperature 27:Wet-bulb temperature 19:
High 46
SPL(dB(A)) LINE
FAN SPEED
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-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Test conditions,
Cooling : Dry-bulb temperature 27:Wet-bulb temperature 19:
High 44
SPL(dB(A)) LINE
FAN SPEED
MCF-GA35VB - E1 MCF-GA50VB - E1
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-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Test conditions,
Cooling : Dry-bulb temperature 27:Wet-bulb temperature 19:
High 48
SPL(dB(A)) LINE
FAN SPEED
INDOOR UNIT
WALL
1m 1m
MICROPHONE
MCF-GA60VB - E1
OB382--1.qxp 04.12.21 16:45 Page 5

WIRING DIAGRAM6
INDOOR UNIT
TAB12
HIC1
ELECTRONIC CONTROL P.C BOARD
1
WHT
DISP/
P.C.BOARD
RECEIVER
12V
REMOTE
CONTROLLER
2
4
5
SW/THERMO
P.C.BOARD
MV
5
2
5
6
RT11
F11
CIRCUIT BREAKER
SUPPLY
TO
OUTDOOR
UNIT
CONNECTING
50Hz
~/N 230V
POWER
1TB2
L
N
PE TB1 GRN/YLW
1
CN202
CN201
BLK
BRN
3
2
BLU
NR11
YLW
4
YLW
BLU
SR142
SR143
LDFM
LDFL
GRN/YLW
8BRN
BLU
6
7
5
WHT
RED
ORN
BLK
LDCOM
C11
X144
LDC12
LDFH
LDC11
CN
112
2 2
WHT
1RED
ORN
BLK
3
2
RT12
MF
CN
101 CN 113 CN 151
SOLID STATE RELAY
TERMINAL BLOCK
RELAY
SR142~SR143
TB1, TB2
X144
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
MV
NR11
RT11
RT12
C11
F11
HIC1
MF
INDOOR FAN CAPACITOR
FUSE (3.15A)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER FUSE)
SYMBOL SYMBOL SYMBOLNAME NAME NAME
MODELS WIRING DIAGRAM
NOTE: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
OUTLINES AND DIMENSIONS
6
5
(When installed on the floor)
(When installed on the ceiling)
500mm or more
500mm or more
500mm or more
500mm or more
1000mm or more
650 616.5
80.8 906 112.8
114
16
1100
93
77
113 143
180
17042.5
[ 12.7 (MCF-GA35/GA50VB)
[ 15.88 (MCF-GA60VB)
Gas line
[ 6.35
Liquid line
Wireless remote controller
162
19
58
INDOOR UNIT
MCF-GA35VB - MCF-GA60VB -
MCF-GA50VB - E1
E1E1 Unit: mm
MCF-GA35VB - MCF-GA50VB - MCF-GA60VB - E1E1E1
OB382--1.qxp 04.12.21 16:45 Page 6

7
REFRIGERANT SYSTEM DIAGRAM7
INDOOR UNIT
MCF-GA60VB - E1
Indoor
heat
exchanger
Distributor Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe [15.88
(with heat insulator)
Refrigerant pipe
[6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Indoor
heat
exchanger
Distributor Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
Flared connection
Refrigerant pipe [12.7
(with heat insulator)
Refrigerant pipe
[6.35
(with heat insulator)
INDOOR UNIT
MCF-GA35VB - E1
Indoor
heat
exchanger
Distributor Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
Flared connection
Refrigerant pipe [12.7
(with heat insulator)
Refrigerant pipe
[6.35
(with heat insulator)
INDOOR UNIT
MCF-GA50VB - E1 Unit : mm
OB382--1.qxp 04.12.21 16:45 Page 7

SERVICE FUNCTIONS
8
8
MCF-GA35VB - MCF-GA50VB - MCF-GA60VB - E1E1E1
Remote controller model : KM04N
J1 J2
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. (Refer to 9-6..)
3-minutes time delay : 3-minutes →3-seconds
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;
Table1.
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
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 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.
NOTE : For remodelling, take out the bat-
teries 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.
OB382--1.qxp 04.12.21 16:45 Page 8

9
How to release “AUTO RESTART FUNCTION”
1Turn off the main power for the unit.
2Pull out the electronic control P.C. board. (Refer to 10.)
3Solder jumper wire to the JR07 on the indoor electronic
control P.C. board. (Refer to 9-6..)
JR07
CN151CN113CN112
CN101
CN105
SW2
CN102
CN201
SW1
IC101
C11
TAB12
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.
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 CON-
TROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided
by the initial room temperature.
8-3. AUTO RESTART FUNCTION
Operation
1If the main power (230V AC) 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.)
OB382--1.qxp 04.12.21 16:45 Page 9

TROUBLESHOOTING
10
9
Insert the negative pole
of the batteries first.
Check if the polarity of
the batteries are correct.
RESET button
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.
1Remove the front lid and insert batteries.
Then reattach the front lid. 2Press the RESET button with tip end of ball point pen or the like, and then use the remote controller.
MCF-GA35VB - MCF-GA50VB - MCF-GA60VB - E1E1E1
NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.
9-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
(1) Check the power supply voltage.
(2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.
(1) Before servicing the air conditioner, be sure to turn off the main unit first with the remote controller, and then after 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 com-
ponents.
(4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
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 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 discoloration.
(4) When troubleshooting, refer to 9-2. “Instruction of troubleshooting” and 9-3. “Troubleshooting check table”.
OB382--1.qxp 04.12.21 16:45 Page 10