Mitsubishi MCF-A12WV-E1, MCF-A18WV-E1, MCF-A24WV-E1 Service Manual

SERVICE MANUAL

(When installed on the ceiling)

(When installed on the floor)

FLOOR AND CEILING TYPE AIR CONDITIONERS

Wireless type
Models

E1

E1

(WH)

(WH)

MCF-A12WV ­MCF-A18WV -

Revision A:

● Power input of SPECIFICATION has modified.

● Model name of remote controller has been

corrected.

Please void OB338.

No. OB338

REVISED EDITION-A

MCF-A24WV -

Indication of
model name

MCF-A12WV ­MCF-A18WV ­MCF-A24WV -

E1

(WH)

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 ············································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

NOTE:

• This service manual describes technical data of indoor units

• As for outdoor units MUCF-A18WV - and MUCF-A24WV - , refer to the service manual OB339.

• As for outdoor unit MU-A12YV - , refer to the service manual OB330 REVISED EDITION-A.

E1

E1E1

(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 o 12mm
Wireless remote
controller
Remote controller
holder
Fixing screw for

3.5 o 16mm (Black)
Battery (AAA) for
remote controller
Drain hose
Drain pipe cover
Knockout cover
Screw for 4 o 10mm

2
2

1
1
2
2

1
1
1
2

Q'ty

Revision A:

•Power input of SPECIFICATION has modified.

•Model name of remote controller has been corrected.
SPECIFICATION, SERVICE FUNCTION and PARTS LIST have modified.

1

MCF-13NV - ➔ MCF-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. (RB4V19-AB ➔ RB4V19-AC)

MCF-24NV - ➔ MCF-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. Diameter of union has changed. (Liquid: {9.52 ➔ {6.35)

8. Indoor fan motor has changed. (RB4V36-AB ➔ RB4V36-DB)

2

TECHNICAL CHANGES

E1E4

E1E3

PART NAMES AND FUNCTIONS

MCF-18NV - ➔ MCF-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. Diameter of union has changed. (Gas: {15.88 ➔ {12.7)

8. Indoor fan motor has changed. (RB4V25-AB ➔ RB4V25-AC)

E1E3

MCF-A12WV - MCF-A18WV - MCF-A24WV -

INDOOR UNIT

E1E1E1

2

MCF-A12WV - MCF-A18WV - MCF-A24WV -

REMOTE CONTROLLER

Signal transmitting section

E1E1E1

Operation display section

OPERATE /STOP

(ON /OFF)button

Open the front lid.

ON/OFF

ON/OFF

TOO

WARM

CLOCK

TOO

WARM

PM

AM

TOO

COOL

PM

AM

TOO

COOL

TEMPERATURE buttons

Indication of remote controller model
is on back.

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

RESET button

FAN

I FEEL

COOL

VANE

DRY

FAN

MODE

ECONO COOL

RESET

CLOCK

STOP

START

HR.

MIN.

OFF-TIMER button

ON-TIMER button

HR. button

MIN. button

(TIME SET button)

CLOCK SET button

VANE CONTROL button

3

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-A18WV -

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

KG04D

MCF-A24WV -

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-A12WV -

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

SPECIFICATION

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

W Reference value

4

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-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

NOISE CRITERIA CURVES

NOISE CRITERIA CURVES
MCF-A12WV -

E1

MCF-A18WV -

E1

MCF-A24WV -

Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

63 125 250 500 1000 2000 4000 8000

E1

FAN SPEED

High

BAND CENTER FREQUENCIES, Hz

SPL(dB

48

(A)) LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

INDOOR UNIT

MICROPHONE

1m

1m

WALL

5

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-A12/A18WV)

[

15.88 (MCF-A24WV)

Gas line

[

6.35

Liquid line

Wireless remote controller

162

19

58

OUTLINES AND DIMENSIONS

MCF-A12WV - MCF-A24WV ­MCF-A18WV -

E1

INDOOR UNIT

E1E1

Unit: mm

WIRING DIAGRAM6

MCF-A12WV - MCF-A18WV - MCF-A24WV -

INDOOR UNIT

TB1

PE

POWER
SUPPLY

N

~/N 230V
50Hz

TO
OUTDOOR
UNIT
CONNECTING

CIRCUIT BREAKER

L

1

2

12V

REMOTE
CONTROLLER

SYMBOL SYMBOL

C11
F11

HIC1

MF

NOTE:1. About the outdoor side electric wiring, refer to the outdoor unit electric wiring diagram for servicing.

INDOOR FAN CAPACITOR
FUSE (3.15A)
DC/DC CONVERTER
INDOOR FAN MOTOR(INNER FUSE)

2. Use copper conductors only.(For field wiring)

3. Symbols below indicate;
: Terminal block, : Connector

GRN/YLW

TB2

MODELS WIRING DIAGRAM

BLU

BRN

BLK

WHT

DISP/
RECEIVER
P.C.BOARD

NR11

1
2
3

CN201

TAB12

CN202

1
2

CN
101CN113CN151

5

4

5

SW/THERMO
P.C.BOARD

ELECTRONIC CONTROL P.C BOARD

6
5

MV

RT11

NAME NAME

MV

VANE MOTOR

VARISTOR
RT11
RT12

ROOM TEMPERATURE THERMISTOR

INDOOR COIL THERMISTOR

6

HIC1

TRANS

F11

E1E1E1

NR11

CN
112

LDCOM
LDC11

C11

LDC12
LDFH

X144

LDFM

SR143

LDFL

SR142

SYMBOLNAME
SR142~SR143
TB1, TB2

X144

SOLID STATE RELAY
TERMINAL BLOCK
RELAY

22

WHT
ORN
RED
BLK
YLW
BLU

RT12

WHT

1

ORN

2

RED

3

BLK

4

YLW

5

BLU

6

BRN

7
8

GRN/YLW

MF

REFRIGERANT SYSTEM DIAGRAM7

MCF-A12WV -

INDOOR UNIT

Indoor
heat
exchanger

Indoor coil
thermistor
RT12

Room temperature
thermistor
RT11

Distributor

E1

Refrigerant pipe [12.7
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe
[6.35
(with heat insulator)

MCF-A18WV -

INDOOR UNIT

Indoor
heat
exchanger

Indoor coil
thermistor
RT12

Room temperature
thermistor
RT11

Distributor

E1

Refrigerant pipe [12.7
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe
[6.35
(with heat insulator)

Unit : mm

MCF-A24WV -

INDOOR UNIT

Indoor
heat
exchanger

Indoor coil
thermistor
RT12

Room temperature
thermistor
RT11

Distributor

E1

Refrigerant pipe [15.88
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe
[6.35
(with heat insulator)

Refrigerant flow in cooling
Refrigerant flow in heating

7

8

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

SERVICE FUNCTIONS

MCF-A12WV - MCF-A18WV - MCF-A24WV -

E1E1E1

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 14.)

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;

Remote controller model : KG04D

J2

J1

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.

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.

Table1.

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.

8

JR07

CN151CN113CN112

CN101

CN105

SW2

CN102

CN201

SW1

IC101

C11

TAB12

8-3. 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. 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 FEELCON­TROL” mode before power failure, the operation is not memorized. In “I FEEL CONTROL” mode, the operation is decided
by the initial room temperature.

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 15.)
3Solder jumper wire to the JR07 on the indoor electronic

control P.C. board. (Refer to page 14.)

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.

9

9

Insert the negative pole
of the batteries first.
Check if the polarity of
the batteries are correct.

RESET button

TROUBLESHOOTING

MCF-A12WV - MCF-A18WV - MCF-A24WV -

E1E1E1

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 first turn off the remote controller to stop the main unit, and then after

confirming 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 the flow chart and the check table on page 11.

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.
1 Remove the front lid and insert batteries.

Then reattach the front lid.

2 Press the RESET button with tip end of ball point

pen or the like, and then use the remote controller.

NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.

10

9-2. Instruction of troubleshooting

OPERATION INDICATOR
lamp

Start

Indoor unit

operates.

Outdoor unit

doesn't

operate.

Indoor unit
doesn't
receive the
signal from
remote
controller.

OPERATION
INDICATOR
lamp on the
indoor unit is
flashing
on and off.

Outdoor unit
operates in
only Test Run
operation.

Outdoor unit
doesn't
operate
even in
Test Run
operation.

Indoor unit
operates, when
the
EMERGENCY
OPERATION
switch is
pressed.

Indoor unit
doesn't
operate,
when the
EMERGENCY
OPERATION
switch is
pressed.

Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage" on
page 14.

Check of
wiring
diagram of
outdoor
unit.w

Refer to B
"Check of
remote
controller
and receiver
P.C. board"
on page 13.

Refer to C
"Check of
indoor
electronic
control
P.C. board"
on page 13.

2-time flash
Cause:
Indoor unit

• Trouble of
room
temperature/
indoor coil
thermistor

Check room
tempreture
thermistor and
indoor coil
thermistor.
Refer to
"Test point
diagram and
voltage"
on page 14.

When the
remote
controller is
pressed
or when the
EMERGENCY
OPERATION
switch is
pressed,
the fan doesn't
rotate, with
OPERATION
INDICATOR
lamp on.

Refer to A
"Check of
indoor fan
motor" on
page 12.

As for outdoor unit MUCF type, refer to service manual OB339.
As for outdoor unit MU type, refer to service manual OB330
REVISED EDITION-A.

w Before checking the outdoor unit, make sure if
any signal or power is being transmitted from
the indoor unit.

4-time flash
Cause:
Indoor unit

• Trouble of
indoor unit
control
system

Replace the
indoor
electronic
control
P.C. board.

No.

1

SymptomOperation indicator lamp Detection method

Checkpoint

Indoor coil
thermistor

Abnormal

point

Room
temperature
thermistor

2-time flash

2.5-second OFF

Detect Indoor coil/room temperature
thermistor short or open circuit.

• Check the resistance of
thermistor.

• Reconnect the connector.

• Check the indoor electronic
control P.C.

Outdoor unit
does not
operate.

2

4-time flash

2.5-second OFF

Indoor
control
system

When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.

Outdoor unit
does not
operate.

• Check the indoor electronic
control P.C. board.

1. Troubleshooting check table

❈ Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.

Self check table

11

2. Trouble criterion of main parts

BLK RED ORNYLWBLU BRN

WHT

GRN

YLW

FUSE

YLW

GRNORN

BRN

RED

ROTOR

MCF-A12WV - MCF-A18WV - MCF-A24WV -

Part name

Room
temperature
thermistor (RT11)

Indoor coil
thermistor (RT12)

Indoor fan
motor
(MF)

INNER FUSE
145 i 5: CUT OFF

Vane
motor
(MV)

Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)

Normal

8kΩ ~ 20kΩ

Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)

Color of lead

wire

MCF-A12WV

WHT-BLK

BLK-YLW
YLW-BLU 45 ~ 50Ω31 ~ 34Ω
BLU-BRN
BRN-RED

Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)

Normal

329 ~ 357Ω

Check method and criterion

Abnormal

Open or short-circuit

Normal

MCF-A18WV

MCF-A24WV

175 ~ 190Ω195 ~ 212Ω

66 ~ 72Ω44 ~ 48Ω

30 ~ 33Ω42 ~ 47Ω
22 ~ 24Ω22 ~ 25Ω

Abnormal

Open or short-circuit

80 ~ 88Ω
44 ~ 49Ω
35 ~ 39Ω
43 ~ 47Ω
13 ~ 15Ω

E1E1E1

Figure

Abnormal

Open or

short-circuit

Indoor fan does not operate.

A

Check of indoor fan motor

No

Are lead wires connected?

Reconnect the lead

wires.

Disconnect lead wires from connector (Fan motor).
Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4 of the fan motor.

Turn OFF power supply.
Check connector (Fan motor) visually.

Yes

Is resistance 0 (short circuit) or ∞ (open circuit)?

Yes ( 0 or ∞ )

Replace the indoor fan motor.

Is soldered point of the connector
correctly soldered?

Yes

Replace the indoor electronic control
P.C. board.

No

(others)

No

Resolder it.

12

Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote con-

● Reinstall the unit away from lights.

● Attach a filter on receiving part.

Switch on the remote controller

Is LCD display on remote controller
visible?

Replace the batteries.(Refer to page 10.)

Remove batteries and then set them back and press
the RESET button. Check if the unit operates with
remote controller.

Does the unit operate with remote controller?

Turn on a radio to AM and press
switch on remote controller.

Is noise heard from radio?

Replace the remote controller.

Are there any fluorescent lights
of inverter or rapid-start type
within the range of 1m?

Measure the voltage between receiver P.C.board connector No.2(+)and No.1 when remote controller button is pressed.

Is the voltage approx. 4V DC?

No
(5V DC or 0V DC)

Replace the receiver.

No
(not clear)

Yes

Yes

No

OK

No

Yes

Yes

Yes

No

Replace the indoor
electronic control P.C. board.

No

troller.

Check of remote controller and receiver P.C. board

B

w Check if the remote controller is exclusive for this air conditioner.

The unit doesn’t operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.

Check of indoor electronic control P.C. board

C

Check both “parts side”and “pattern
side” of indoor electronic control P.C.
board visually.

Be sure to check both fuse
and varistor in any case.

Replace the fuse.

Is fuse(F11)blown?

Is varistor(NR11)burnt?

Replace the varistor.

Yes

No

Trouble of the indoor electronic
control P.C. board.

No

Yes

13

DE00R697B

To the indoor
electronic control
P.C.board CN113

Indoor coil thermistor (RT12)
Room temperature thermistor (RT11)

RT11

EMERGENCY OPERATION switch

TH113

CH313

GILMS

12

0

0

10

20

30

40

10 20 30 40 50 60

Temperature ( C)

Resistance (K')

TEST POINT DIAGRAM AND VOLTAGE
MCF-A12WV - MCF-A18WV - MCF-A24WV -

Indoor electronic control P.C. board

Fan motor power supply 230V AC

Med.

Low

654321

High

Fuse (F11)
250V AC

3.15A
Varistor (NR11)

E1E1E1

Power supply
input 230V AC

+

5V DC

}

–

–

12V DC

}

+

No.2 No.1

Receiver P.C.

– +

board connector
(CN101)

Room temperature
thermistor(RT11)

Release of “AUTO RESTART
FUNCTION”
Solder jumper wire to the JR07.
(Refer to page 9.)

Room temperature thermistor (RT11)

Time short point JPG and JPS
(Refer to page 8.)

Indoor coil thermistor (RT12)

14

DISASSEMBLY INSTRUCTIONS10

Slide the sleeve and check if there is a locking lever or not.

1Slide the sleeve.
2Pull the terminal while

pushing the locking
lever.

In case of terminal with lock mechanism, detach the terminal as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism.
The terminal with no lock mechanism can be removed by pulling it out.
Check the shape of the terminal and work.

<"Terminal with lock mechanism" Detaching points>

Sleeve

Locking lever

MCF-A12WV - MCF-A18WV - MCF-A24WV ­INDOOR UNIT

OPERATING PROCEDURE

1. Removing the electronic control P.C. board.

(1) Pull out the upper part of the grille. (Photo 1)
(2) Remove the screws of the grille.
(3) Remove screws of terminal block cover.

Remove the terminal block cover and remove the terminal

block.
(4) Remove the screws of the electronic box cover.
(5) Pull out the electronic control P.C. board.

Photo 3

Photo 1

Photo 2

E1E1E1

PHOTOS

Screws

Grille

Electronic control P.C. board

2. Removing the indoor fan motor

(1) Remove the grille. (Refer to 1(1) (2).)
(2) Remove the fan casing.(upper)
(3) Disconnect the connector of the indoor fan motor.
(4) Disconnect the ground wire of the fan motor.
(5) Remove the screws of the motor band and remove the

catch.
(6) Take out the sirocco fan and the indoor fan motor.

15

Electronic box

Photo 4

Fan casing
(upper)

Indoor fan motor

Terminal block

Motor band

Screws

Fan
casing(upper)

OPERATING PROCEDURE

PHOTOS

3. Removing the indoor heat exchanger.

(1) Remove the grille. (Refer to 1(1) (2).)
(2) Remove the screws on both side and in front of the front

panel. (Photo 5)
(3) Remove the screws of the nozzle assembly. (Photo 6)
(4) Remove the electronic box. (Refer to 1.)
(5) Remove the indoor fan motor. (Refer to 2.)
(6) Remove the screws of the motor support .
(7) Remove the fan casing. (Iower)
(8) Remove the insulation of the drain pan and remove the

screws. (Photo 7)
(9) Remove the screws under the drain pan. (Photo 8)
(10) Remove the drain pan.
(11) Remove the indoor heat exchanger.

Photo 5

Screws

Front panel

Photo 6

Nozzle assembly

Photo 7

Photo 8

Screws

Insulation of drain pan and screws

Drain pan

16

screws

PARTS LIST11

Q'ty/unit

1
2
3
4
5
6
7
8

9

10
11
12
13

14
15

16

VANE MOTOR
INSTALLATION METAL (L)
AIR FILTER
GRILLE (WH)
FRONT PANEL (WH)
DRAIN PAN
FAN CASING (U)
FAN CASING (L)
UNION (GAS)
UNION (GAS)
INSTALLATION METAL (R)
UNION (LIQUID)
BACK PANEL (IN)
NOZZLE (WH)
INDOOR HEAT EXCHANGER
INDOOR HEAT EXCHANGER
VANE (WH)
GRILLE CATCH (WH)

{12.7
{15.88

{6.35

3PCS/SET

1
1
2
1
1
1
2
2
1

1
1
1
1
1

1
3

1
1
2
1
1
1
2
2
1

1
1
1
1

1
1
3

1
1
2
1
1
1
2
2

1
1
1
1
1

1
1
3

MV

E02 227 303
E02 179 971
E02 179 100
E02 179 010
E02 179 000
E02 215 700
E02 179 237
E02 179 238
E02 179 667
E02 138 666
E02 179 972
E02 138 667
E02 179 231
E02 227 235
E02 823 620
E02 824 620
E02 227 040
E02 179 142

No.

Part No. RemarksPart name

Symbol

in Wiring

Diagram

-

E1

(WH)

MCF-A12WV

-

E1

(WH)

MCF-A18WV

-

E1

(WH)

MCF-A24WV

MCF-A12WV - (WH)
MCF-A18WV - (WH)
MCF-A24WV - (WH)

E1

E1

E1

11-1. INDOOR UNIT

STRUCTURAL PARTS

1

2

3

4

15

1314

12
11

10

9

8

Part number that is circled is not shown in the illustration.

65

17

7

1
2

3
4

5
6
7

8
9

10

11

SIROCCO FAN
FAN MOTOR RUBBER MOUNT
INDOOR FAN MOTOR
INDOOR FAN MOTOR
INDOOR FAN MOTOR
TERMINAL BLOCK
TERMINAL BLOCK
RECEIVER P.C. BOARD
INDOOR COIL THERMISTOR
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
ELECTRONIC CONTROL P.C. BOARD
SWITCH & ROOM TEMPERATURE THERMISTOR P.C. BOARD
VARISTOR
FUSE

2
2
1

1
1
1
1
1

1
1
1

2
2

1
1

1
1
1

1
1

1
1

2
2

1
1
1
1
1

1
1
1
1

MF
MF

MF
TB2
TB1

RT12

NR11

F11

REMOTE CONTROLLER
REMOTE CONTROLLER HOLDER

SW/THERMO

P.C. BOARD

Q'ty/unit

E02 179 500
E02 179 505
E02 227 300
E02 228 300
E02 684 300
E02 824 375
E02 823 375
E02 227 468
E02 324 307
E02 823 452
E02 824 452
E02 825 452
E02 215 328
E02 820 385
E02 127 382

No. Part No.

RemarksPart name

Symbol

in Wiring

Diagram

2PCS/SET
RB4V19­RB4V25­RB4V36­3P
3P

3.15A

12
13

1
1

1
1

1
1

E02 823 426
E02 527 083

DISP/RECEIVER

P.C. BOARD

-

E1

(WH)

MCF-A12WV

-

E1

(WH)

MCF-A18WV

-

E1

(WH)

MCF-A24WV

KG04D

MCF-A12WV - (WH)
MCF-A18WV - (WH)
MCF-A24WV - (WH)

E1

E1

E1

11-2. INDOOR UNIT

ELECTRICAL PARTS

9

8

1
2

3
2
1

6

7

11-2. INDOOR UNIT ELECTRICAL PARTS

Part numbers that are circled are not shown in the illustration.

11-3. ACCESSORY AND

REMOTE CONTROLLER

4

5

1312

11-3. ACCESSORY AND REMOTE CONTROLLER

18

OPTIONAL PARTS12

Remove the air
filter and the
deodorizing
filter together.

Separate the deodorizing
filter (gray sponge type)
from the air filter.

Remove the air
filter and the
air cleaning filter
together.

Separate the air
cleaning filter
(white bellows type)
from the air filter.

12-1. AIR CLEANING FILTER

● If the air cleaning filter is clogged, it may lower the unit’s capacity or cause condensation at the air outlet.

● The air cleaning filter is disposable. The standard usable term is about 4 months. However, if the color of the filter

turns to dark brown, replace soon.

Models

MCF-A12WV ­MCF-A18WV ­MCF-A24WV -

E1
E1
E1

Part No.

MAC - 1200 FT

12-2. DEODORIZING FILTER

● Clean the filter every two weeks. When it becomes too dirt, clean it more often.

● Replace the filter with a new one when its color can not be restored even after washing or when the filter becomes dark.

● Standard interval for the filter replacement is about 1 year.

Models

MCF-A12WV ­MCF-A18WV ­MCF-A24WV -

E1
E1
E1

Part No.

MAC - 1700 DF

19

HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN

CC

Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Apr. 2004. No.OB338 REVISED EDITION-A 6
Distributed in Mar. 2004. No.OB338 6
Made in Japan

New publication, effective Apr. 2004
Specifications subject to change without notice.