Mitsubishi Electric MCFH-A12WV User manual

SERVICE MANUAL
Wireless type
Models
MCFH-A12WV- (WH)
MCFH-A18WV- (WH)
MCFH-A24WV- (WH)
E1
E1
E1
No. OB336
(When installed on the ceiling)
(When installed on the floor)
FLOOR AND CEILING TYPE AIR CONDITIONERS
NOTE:
• This manual describes technical data of indoor units
• As for outdoor units MUCFH-A18/A24WV- , refer to the service manual OB337.
• As for outdoor unit MUH-A12YV- , refer to the service manual OB331.
• As for outdoor units MXZ-A18/A26/A32WV- , refer to the service manual OB319.
E1
E1
E1
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 ············································7
7. REFRIGERANT SYSTEM DIAGRAM················8
8. SERVICE FUNCTIONS ······································9
9. TROUBLESHOOTING······································11
10. DISASSEMBLY INSTRUCTIONS·····················19
11. PARTS LIST······················································21
12. OPTIONAL PARTS···········································23
Indication of
model name
MCFH-A12WV-
MCFH-A18WV-
MCFH-A24WV- E1
E1
E1
OB336--1.qxp 04.1.6 11:12 AM Page 1

PART NAMES AND FUNCTIONS
2
TECHNICAL CHANGES
2
1
INDOOR UNIT
MCFH-A12WV -
MCFH-A18WV -
MCFH-A24WV - E1
E1
E1
(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
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
mounting hardware
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
MCFH-13NV- ➔MCFH-A12WV-
1. Rated voltage has changed. (220-240V ➔230V)
2. Indoor electronic control P.C. board has changed.
3. Horizontal vane has changed.
4. Terminal block has changed.
5. Indoor heat exchanger has changed.
6. Remote controller has changed.
Econo cool operation has been added.
7. Indoor fan motor has changed. (RB4V25-AB ➔RB4V25-AC)
E1E4 MCFH-18NV- ➔MCFH-A18WV-
1. Rated voltage has changed. (220-240V ➔230V)
2. Indoor electronic control P.C. board has changed.
3. Horizontal vane has changed.
4. Terminal block has changed.
5. Indoor heat exchanger has changed.
6. Remote controller has changed.
Econo cool operation has been added.
7. Gas of union has changed. ({15.88 ➔{12.7)
8. Indoor fan motor has changed. (RB4V36-AB ➔RB4V36-AC)
E1E3
MCFH-24NV- ➔MCFH-A24WV-
1. Rated voltage has changed. (220-240V ➔230V)
2. Indoor electronic control P.C. board has changed.
3. Horizontal vane has changed.
4. Terminal block has changed.
5. Indoor heat exchanger has changed.
6. Remote controller has changed.
Econo cool operation has been added.
7. Liquid of union has changed. ({9.52 ➔{6.35)
8. Indoor fan motor has changed. (RB4V36-AB ➔RB4V36-DB)
E1E3
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3
REMOTE CONTROLLER
MCFH-A12WV -
MCFH-A18WV -
MCFH-A24WV - E1
E1
E1
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.
OB336--1.qxp 04.1.6 11:13 AM 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(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High/Med.W/LowW)
Fan speed(High/Med.W/LowW)
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)
Remote controller model
K/h
A
A
W
A(kW)
%
A
"
mm
kg
dB
rpm
k"
k"
Electrical data
Fan motor
Special remarks
Capacity
MCFH-A12WV- E1 MCFH-A18WV- E1 MCFH-A24WV- E1
Cooling
—
Heating
—
780/636W/492W
10
0.30
0.066
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
25
5
46/41W/36W
1,240/1,060/845
3
10
10
KG04C
Cooling
—
Heating
—
Single phase
230V, 50Hz
840/696W/570W
10
0.36
0.080
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
1100 ✕ 650 ✕ 180
25
5
48/44W/39W
1,320/1,145/960
3
10
10
KG04C
Cooling
—
Heating
—
840/744W/642W
10
0.36
0.080
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
25
5
48/45W/42W
1,320/1,190/1,060
3
10
10
KG04C
NOTE: Test conditions are based on ISO 5151
Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C WB 15°C
Outdoor DB35°C WB(24°C) Outdoor DB 7°C WB 6°C
Indoor-Outdoor piping length : 5 m
wReference value
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5
NOISE CRITERIA CURVES
4
MCFH-A24WV - 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
Test conditions,
Cooling : DB 27: WB 19:\
Heating : DB 20: WB 15:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
High
SPEED
48
SPL(dB(A)) LINE
MCFH-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
Test conditions,
Cooling : DB 27: WB 19:\
Heating : DB 20: WB 15:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
High
SPEED
46
SPL(dB(A)) LINE
MCFH-A18WV - 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
Test conditions,
Cooling : DB 27: WB 19:\
Heating : DB 20: WB 15:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
High
SPEED
48
SPL(dB(A)) LINE
INDOOR UNIT
WALL
1m 1m
MICROPHONE
OB336--1.qxp 04.1.6 11:13 AM Page 5

OUTLINES AND DIMENSIONS
6
5
(When installed on the floor)
(When installed on the ceiling)
50cm or more
50cm or more
50cm or more
50cm or more
100cm or more
650 616.5
80.8 906 112.8
114
16
1100
93
77
113 143
180
17042.5
12.7 (MCFH-A12/A18WV)
15.88 (MCFH-A24WV)
Gas line
6.35
Liquid line
Wireless remote controller
162
19
58
INDOOR UNIT
MCFH-A12WV -
MCFH-A18WV -
MCFH-A24WV - E1
E1
E1 Unit: mm
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7
WIRING DIAGRAM6
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
TRANS
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
MCFH-A12WV -
MCFH-A18WV -
MCFH-A24WV - E1
E1
E1
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8
REFRIGERANT SYSTEM DIAGRAM7
INDOOR UNIT
MCFH-A24WV- 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
MCFH-A12WV- 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
MCFH-A18WV- E1
Unit : mm
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9
SERVICE FUNCTIONS8
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 page 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.)
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.
MCFH-A12WV - MCFH-A18WV - MCFH-A24WV - E1E1E1
Remote controller model : KG04C
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
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10
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 18.)
JR07
CN151CN113CN112
CN101
CN105
SW2
CN102
CN201
SW1
IC101
C11
TAB12
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.)
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
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