Mitsubishi Electric MCFZ-A12WV User manual

SERVICE MANUAL
Wireless type
Models
MCFZ-A12WV - (WH)
MCFZ-A18WV - (WH)
MCFZ-A24WV - (WH)
E1
E1
E1
(When installed on the ceiling)
(When installed on the floor)
FLOOR AND CEILING TYPE AIR CONDITIONERS
CONTENTS
1. PART NAMES AND FUNCTIONS······················2
2. SPECIFICATION·················································4
3. NOISE CRITERIA CURVES·······························5
4. OUTLINES AND DIMENSIONS ·························6
5. WIRING DIAGRAM ············································6
6. REFRIGERANT SYSTEM DIAGRAM················8
7. SERVICE FUNCTIONS ······································8
8. TROUBLESHOOTING······································10
9. DISASSEMBLY INSTRUCTIONS ····················19
10. PARTS LIST······················································21
11. OPTIONAL PARTS···········································23
Indication of
model name
MCFZ-A12WV -
MCFZ-A18WV -
MCFZ-A24WV - E1
E1
E1
NOTE:
• This service manual describes technical data of indoor units.
• As for outdoor units MUZ-A12YV - and MUZ-A12YVH - ,
refer to the service manual OB328 REVISED EDITION-A.
• As for outdoor units MUZ-A18YV - and MUZ-A24YV - ,
refer to the service manual OB346 REVISED EDITION-A. E1E1
E1E1
Revision A:
● MCFZ-A18WV-and MCFZ-A24WV-
have been added. E1E1
Please void OB344.
No. OB344
REVISED EDITION-A
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PART NAMES AND FUNCTIONS
2
1
REMOTE CONTROLLER
MCFZ-A12WV - E1
INDOOR UNIT
MCFZ-A12WV - MCFZ-A18WV - MCFZ-A24WV - E1E1E1
(When installed on the floor)
(When the air inlet grille is opened.)
Deodorizing filter
(Gray sponge type)(option)
Air filter
Air inlet
Operation section
Air cleaning filter
(White bellows type)(option)
Front panel
Remote control receiving section
Operation indicator lamp
Horizontal vane
Vertical vanes
Emergency
operation switch
(When installed on the ceiling)
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
Remote controller
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
AMPM
CLOCK
˚C
AM
RESET CLOCK
I FEEL
COOL
DRY
AUTO
HEAT
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
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
ECONO COOL button
VANE CONTROL button
CLOCK SET button
Indication of remote controller model
is on back.
ACCESSORIES
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3
REMOTE CONTROLLER
MCFZ-A18WV - MCFZ-A24WV - E1E1
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL COOL
HEAT
DRY
PM
CLOCK
AM
RESET CLOCK
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
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
ON-TIMER button
RESET button
ECONO COOL button
VANE CONTROL button
CLOCK SET button
HR. button
MIN. button
(TIME SET button)
Indication of remote controller model
is on back.
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4
SPECIFICATION
2
Indoor model
Function
Power supply
Air flow(High/Med.W/LowW)
Power outlet
Running current ✽1
Power input ✽1
Auxiliary heater
Power factor ✽1
Fan motor current ✽1
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"
Electrical data
Fan motor
Special remarks
Capacity
MCFZ-A18WV - E1
Cooling
—
Heating
—
Cooling
—
Heating
—
Cooling
—
Heating
—
Single phase
230V, 50Hz
840/696W/570W
10
0.36
80
97
0.36
RB4V36-AC
WHT-BLK 82.9 BLK-YLW 65.6
YLW-BLU 36.0 BLU-BRN 27.0
BRN-RED 13.7
1,100 O650 O180
25
5
48/44W/39W
1,320/1,145/960
3
10
10
KG04C
MCFZ-A24WV - E1
Single phase
230V, 50Hz
840/744W/642W
10
0.36
80
97
0.36
RB4V36-DB
WHT-BLK 84.0 BLK-YLW 46.2
YLW-BLU 37.2 BLU-BRN 45.2
BRN-RED 13.6
1,100 O650 O180
25
5
48/45W/42W
1,320/1,190/1,060
3
10
10
KG04C
MCFZ-A12WV - E1
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
1,100 O650 O180
25
5
46/41W/35W
1,240/1,060W/845W
3
10
10
KG04B
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 15°C
Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
Indoor-Outdoor piping length (one way) : 5 m
wReference value
✽1 Measured under rated operating frequency.
1.8+ 440V
250V 3.15A
MP20 12V 250"
ERZV10D471/ TNR10V471K410
AQG12212/ G3MC-201PL
3P/ 4P
G5NB-1A-DC12V/ G5N-1A-DC12V
145 i2:
INDOOR UNIT
Item Model
Indoor fan capacitor
Fuse
Vane motor
Varistor
Solid state relay
Terminal block
Relay
Compressor contactor
Indoor fan motor thermal fuse
MCFZ-A18WV - E1
MCFZ-A12WV - E1 MCFZ-A24WV - E1
(C11)
(F11)
(MV)
(NR11)
(SR141~SR143)
(TB1/TB2)
(X144)
(52C) ALF1T12 –
Specifications and rating conditions of main electric parts
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5
NOISE CRITERIA CURVES
3
MCFZ-A12WV - 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
High
SPEED
46
SPL(dB(A)) LINE
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:
INDOOR UNIT
WALL
1m 1m
MICROPHONE
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
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:\ 
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
High
SPEED
48
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-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 15:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
High
SPEED
48
SPL(dB(A)) LINE
MCFZ-A24WV - E1
MCFZ-A18WV - E1
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6
OUTLINES AND DIMENSIONS
4
(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
9.52(MCFZ-A12WV)
12.7(MCFZ-A18WV)
15.88(MCFZ-A24WV)
Gas line
6.35
Liquid line
Wireless remote controller
162
19
58
INDOOR UNIT
MCFZ-A12WV - MCFZ-A18WV - MCFZ-A24WV - E1E1E1 Unit: mm
WIRING DIAGRAM5
INDOOR UNIT
HIC1
ELECTRONIC CONTROL P.C BOARD
SR142
SR143
X144
CN201
BRN
RECEIVER
P.C.BOARD
CONTROLLER
REMOTE
DISP/
12V
CONNECTING
TO OUTDOOR
UNIT 3
N
RT11
P.C.BOARD
SW/THERMO
113 151
101
MV
4
5
5
5
6
CN CN CN F11
NR11
C11
2
1
3
2
7
8
LDFH
LDFL
LDFM
LDC12
LDC11
LDCOM
BLK
BLU
YLW 6
5
4
ORN
RED
WHT
2
3
1
GRN/YLW
BLK MF
BLU
BRN
YLW
ORN
RED
WHT
2
112
CN 2RT12
BLU
GRN/YLW
BRN
SR141
LDFVL
GRN/YLW
BLU
WHT
RED
230V~ TB2
PE TB1
CIRCUIT BREAKER
N
L
~/N 230V
50Hz
POWER
SUPPLY
52C 3
4
MODEL WIRING DIAGRAM
MCFZ-A12WV - E1
SYMBOL
SR141~SR143
TB1, TB2
X144
52C
SYMBOL
MV
NR11
RT11
RT12
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE (3.15A)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
RELAY
COMPRESSOR CONTACTOR
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
NOTES:
SYMBOL
C11
F11
HIC1
MF
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7
INDOOR UNIT
TAB12
ELECTRONIC CONTROL P.C BOARD
SR142
SR143
X144
CN201
BRN
RECEIVER
P.C.BOARD
CONTROLLER
REMOTE
DISP/
12V
CONNECTING
TO OUTDOOR
UNIT
3
N
RT11
P.C.BOARD
SW/THERMO
113 151101
MV
4
5
55
6
CN CN CN
C11
50Hz
SUPPLY
POWER
L
N1
3
2
7
8
LDFH
LDFL
LDFM
LDC12
LDC11
LDCOM
BLK
BLU
YLW 6
5
4
ORN
RED
WHT 2
3
1
GRN/YLW
BLK MF
BLU
BRN
YLW
ORN
RED
WHT
2
112
CN 2RT12
BLU
RED
BLU
TB1 GRN/YLW
~/N 230V
BRN
SR141
LDFVL
TB2
PE
CIRCUIT BREAKER
HIC1
F11
NR11
MODELS WIRING DIAGRAM
SYMBOL
SR141~SR143
TB1, TB2
X144
SYMBOL
MV
NR11
RT11
RT12
NAME NAME NAME
INDOOR FAN CAPACITOR
FUSE (3.15A)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER FUSE)
VANE MOTOR
VARISTOR
ROOM TEMPERATURE THERMISTOR
INDOOR COIL THERMISTOR
SOLID STATE RELAY
TERMINAL BLOCK
RELAY
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
NOTES:
SYMBOL
C11
F11
HIC1
MF
MCFZ-A18WV -
MCFZ-A24WV - E1
E1
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8
SERVICE FUNCTIONS7
REFRIGERANT SYSTEM DIAGRAM6
7-1. 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 page 17 or 18.)
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.)
7-2. 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;
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.
MCFZ-A12WV - MCFZ-A18WV - MCFZ-A24WV - E1E1E1
Remote controller model : KG04B(MCFZ-A12WV),KG04C(MCFZ-A18/A24WV)
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.
J2
J1
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
Flared connection
Refrigerant pipe [9.52
(with heat insulator)
Refrigerant pipe
[6.35
(with heat insulator)
Muffler
INDOOR UNIT
MCFZ-A12WV- E1 Unit : mm
Indoor
heat
exchanger
Distributor Flared connection
Room temperature
thermistor
RT11
Indoor coil
thermistor
RT12
Flared connection
Refrigerant pipe [12.7(MCFZ-A18MV)
Refrigerant pipe [15.88(MCFZ-A24MV)
(with heat insulator)
Refrigerant pipe
[6.35
(with heat insulator)
INDOOR UNIT
MCFZ-A18WV-
MCFZ-A24WV- E1
E1
Refrigerant flow in cooling
Refrigerant flow in heating
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9
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
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.
How to release “AUTO RESTART FUNCTION”
1Turn off the main power for the unit.
2Pull out the electronic control P.C. board. (Refer to page 19.)
3Solder jumper wire to the JR07 on the indoor electronic
control P.C. board. (Refer to page 17 or 18.)
JR07
CN151CN113CN112
CN101
CN105
SW2
CN102
CN201
SW1
IC101
C11
52C
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 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.
When the indoor unit is controlled with the remote controller, the operation mode, the 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” or “AUTO” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the opera-
tion is decided by the initial room temperature.
7-3. AUTO RESTART FUNCTION
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10
TROUBLESHOOTING
8
8-1. 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 service.
(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 has completely closed, turn off the breaker.
(2) Be sure to unplug the power cord before removing the air inlet grille, the front panel, the cabinet, the top panel and
the electronic control P.C. boards.
(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.
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) 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.
(3) When troubleshooting, refer to the flow chart and the check table on page 11 and 12.
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.
NOTE : 1.These figures show about MCFZ-A18WV or MCFZ-A24WV.
2. If the RESET button is not pressed, the remote controller may not operate correctly.
3. Remote controller of MCFZ-A12WV 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.
MCFZ-A12WV - MCFZ-A18WV - MCFZ-A24WV - E1E1E1
RESET button
Insert the negative pole
of the batteries first.
Check if the polarity of
the batteries are correct.
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