Mitsubishi Electric MSC-07RV User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················8
3. SPECIFICATION···············································11
4. WIRING DIAGRAM ··········································13
5. REFRIGERANT SYSTEM DIAGRAM··············15
6. MICROPROCESSOR CONTROL ····················16
7. TROUBLESHOOTING······································16
8. PARTS LIST ·····················································27
Wireless type
Models
MSC-07RV - (WH) · MU-07RV -
MSC-09RV - (WH) · MU-09RV -
MSC-12RV - (WH) · MU-12RV -
MSC-07RV - (WH) · MU-07RV -
MSC-09RV - (WH) · MU-09RV -
MSC-12RV - (WH) · MU-12RV -
MSC-07RV - (WH) · MU-07RV -
MSC-09RV - (WH) · MU-09RV -
MSC-12RV - (WH) · MU-12RV -
MSC-07RV - (WH) · MUH-07RV -
MSC-09RV - (WH) · MUH-09RV -
MSC-12RV - (WH) · MUH-12RV -
MSC-07RV - (WH) · MUH-07RV -
MSC-09RV - (WH) · MUH-09RV -
MSC-12RV - (WH) · MUH-12RV -
MSC-07RV - (WH) · MUH-07RV -
MSC-09RV - (WH) · MUH-09RV -
MSC-12RV - (WH) · MUH-12RV -
Multi system type
MSC-07RV - (WH) · MUX-10RV -
MSC-09RV - (WH) · MUX-18RV -
MSC-12RV - (WH) · MUX-24RV -
Inverter controlled multi system type
· MXZ-18RV -
E2
E2E2
E2E2
E2E2
E4E4
E4E4
E4E4
E3E3
E3E3
E3E3
E2E2
E2E2
E2E2
E4E4
E4E4
E4E4
E3E3
E3E3
E3E3
E2E2
E2E2
E2E2
No. OB252
REVISED EDITION-C
SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMPAIR CONDITION
NOTE: • This service Manual covers only change points.
Please refer to the Service Manual OB227 REVISED
EDITION-B for unchanged contents.
• Please refer to the following service manual when the
outdoor unit is the under mentioned model.
MXZ-32SV- : OB254
MXZ-18TV- : OB280
MUX-19/20/25TV- : OB284
• Please void OB252 REVISED EDITION-B.
E1
E1
E1
MSC-07RV -
MSC-09RV -
MSC-12RV - E4
E4
E4
OB252C-1.qxp 02.4.25 11:27 AM Page 1

REVISION
Parts numbers have been partially modified.
Page Part name
E02 504 426 ➔E02 141 083REMOTE CONTROLLER HOLDER
Model
MSC-07/09/12RV- E1
MSC-07/09/12RV- E2
MSC-07/09/12RV- E2
P27
Part number
P27 REMOTE CONTROLLER E02 141 083 ➔E02 504 426
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3
TECHNICAL CHANGES
1
1
2
3
4
5
6
7
8
9
10
11
12
13
The specifications of Indoor and Outdoor fan motor.
The data of Med. and Low speed are added to Indoor fan motor
specification✼
✼The data value of indoor fan motor does not change if the indoor
unit is connected to a multi-type outdoor unit.
Remote controllers of COOL ONLY or COOL & HEAT
type are outdoor unit accessory.
Remote controller is included as an indoor unit accessory.
Two-way common remote controller
Two-way (using dip switch) remote controller
The specification of electronic control P.C. board is
compatible with remote controllers of COOL ONLY
and COOL & HEAT type.
Indoor electronic control P.C. board has changed
for two-way remote controller.
Indoor electronic control P.C. board has changed
for two-way remote controller.
Microprocessor programing flow has changed.
Electronic control P.C. board for E3 is interchangeable
with the one for E2 (except for MSC-12RV).
(New P.C. board) Indoor electronic control P.C. board has
changed.
Earth wire from the board is fixed to the electrical box with screw.
The shape of connector CN211 has changed. Indoor electronic
control P.C. board has been connected with
Power monitor, receiver P.C. board using connector.
When fan speed is set to"Auto", initial temperature difference
specitying changing fan speed has been improved in order to
reach the set temperature faster than E1, E2, and E3.
The mark of terminal block has changed. Terminal block for E4 is
interchangeable with the ones for E1, E2 and E3.
Winding resistance and shape of fan motor have changed.
Fan motor for E4 is not interchangeable with the ones for E1,
E2 and E3 except for MSC-12RV.
Fan motor rubber mount has changed because the shape of
fan motor was changed.
Circle shows the change point of the model.
Change point
No.
MSC-07RV-
E1
E2
E3 MSC-09RV-
E1
E2 E3 MSC-12RV-
E1
E2 E3
E4
E4
E4
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4
1
2
3
4
5
6
7
8
9
10
11
12
13
Remote controller of COOL ONLY type is outdoor unit accessory.
Remote controller is included as an indoor unit accessory.
Compressor contactor (52C) has changed. Compressor
contactor for E2,E3,E4 are interchangeable with the ones for E1.
Compressor has changed. Compressors for E3 and E4 are not
interchangeable with the ones for E1 and E2.
Compressor capacitor has changed. Due to different shape,
compressor capacitor for E4 is not interchangeable with the
ones for E1, E2 and E3.
Fuse has been removed.
Wiring diagram has changed because fuse was removed.
The shape of propeller fan has changed. The number of
propeller fan has changed from four to three. Propeller fan for E4
is not interchangeable with the ones for E1, E2 and E3.
The shape, diameter of axis and fan speed of fan motor have
changed. Fan motor for E4 is not interchangeable with the ones
for E1, E2 and E3.
Fan motor capacitor has changed. 1.5+➔ 2.0+
Fan motor capacitor for E4 is not interchangeable with the
ones for E1, E2 and E3(MU-12RV only).
Refrigerant filing capacity has changed. 0.85kg➔ 0.80kg
The method of troubleshooting for outdoor unit has changed.
The repairing procedure when outdoor unit does not stop
has been added to troubleshooting.
Circle shows that change points apply to the models.
Change point
No.
MU-07RV-
E1
E2
E3 MU-09RV-
E1
E2 E3 MU-12RV-
E1
E2 E3
E4
E4
E4
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5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Remote controller of COOL & HEAT type is outdoor unit
accessory.
Remote controller is included as an indoor unit accessory.
Accumulator has been removed.
Compressor has changed.
Compressor capacitor has changed. Due to different
shape, compressor capacitor for E4 is not interchangeable
with the ones for E1,E2 and E3.
The mark of terminal block has changed. Terminal block
for E4 is interchangeable with the ones for E1, E2 and E3.
Deicer P.C. board has changed. Jumper wire of compulsory
defrosting mode has changed.
(JP607-R853➔JPDS-JPSG)
Jumper wire for defrost setting has changed.
(JPC-JPE➔JRF-JRG) (Refer to page 26.)
The defrosting intervals which are changed by setting a short
circuit are the same as E1, E2, and E3.
Deicer P.C. board for E4 is not interchangeable with the
ones for E1, E2 and E3.
Wiring diagram has changed according to the following
reasons; the shape of connectors CN711 and CN661 has
changed and R.V. coil relay (X62) has changed into SSR (SR62).
X62 has changed into SR62 in Example of Operation
time chart in HEAT operation.
Compared to E1, E2, and E3, no change has been made about
the operational condition for defrosting and tne control system of
R.V. coil (timing of switching on/off).
The shape of propeller fan has changed. The number of
propeller fan has changed from four to three. Propeller
fan for E4 is not interchangeable with the ones for E1,E2, and E3.
The shape and diameter of axis of fan motor have changed.
The shape of connector has changed.
Fan motor and connector for E4 are not interchangeable
with those for E1, E2 and E3.
Refrigerant filling capacity has changed. 0.80kg➔ 0.85kg
The method of checking serial signal error for E4 has been added.
The method of troubleshooting for outdoor unit has changed.
The method for checking thermistor has been added to
troubleshooting.
The method for checking 4-way valve has been added to
troubleshooting.
The repairing procedure when outdoor unit does not stop has
been added to troubleshooting.
Circle shows that change points apply to the models.
Change point
No.
MUH-07RV-
E1
E2
E3 MUH-09RV-
E1
E2 E3 MUH-12RV-
E1
E2 E3
E4
E4
E4
MUX-10RV -
MUX-18RV -
MUX-24RV -
MXZ-18RV - E1
E1
E1
E1 MUX-10RV -
MUX-18RV -
MUX-24RV -
MXZ-18RV - E2
E2
E2
E2
1. Remote controller is unprovided as the outdoor unit accessory.
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6
COOL ONLY COOL
& HEAT TWO-WAY
REMOTE CONTROLLER
Model
MS-07/09/12RV- E1
MSH-07/09/12RV- E1
MS-07/09/12RV- E2
MSH-07/09/12RV- E2
✕✕
✕
✕
w
wWhen HEAT mode is selected
by the remote controller of
COOL & HEAT type, the unit
will operate in FAN mode.
TWO-WAY
DIP switch
✕
MS-07/09/12RV- E3
MSH-07/09/12RV- E3
MS-07/09/12RV- E4
MSH-07/09/12RV- E4 ✕
✕
Reference
COOL ONLY REMOTE CONTROLLER TWO-WAY REMOTE CONTROLLER
COOL&HEAT REMOTE CONTROLLER TWO-WAY REMOTE CONTROLLER
1. Both of COOL ONLY and COOL & HEAT remote controller are unified into a two-way remote controller.
2. FAN mode operation is available in COOL ONLY unit. In this case the set room temperature
will be displayed on the remote controller, however, the room temperature can not be controlled by remote controller button.
HEAT operation is available in only HEAT & COOL type unit.
TWO-WAY REMOTE CONTROLLER TWO-WAY DIP SWITCH REMOTE CONTROLLER
• Outlines and dimensions have been changed.
162
19
58
Wireless remote controller
MSC-07RV -
MSC-09RV -
MSC-12RV -
MU-07RV -
MU-09RV -
MU-12RV -
MUH-07RV -
MUH-09RV -
MUH-12RV - E1
E1
E1
E1
E1
E1
E1
E1
E1 MSC-07RV -
MSC-09RV -
MSC-12RV -
MU-07RV -
MU-09RV -
MU-12RV -
MUH-07RV -
MUH-09RV -
MUH-12RV - E2
E2
E2
E2
E2
E2
E2
E2
E2
MSC-07RV -
MSC-09RV -
MSC-12RV - E2
E2
E2 MSC-07RV -
MSC-09RV -
MSC-12RV - E3
E3
E3
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7
Slide switch Type
The position
of the slide
switch
COOL ONLYCOOL & HEAT
REMOTE CONTROLLER (How to set the type)
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 it does not, correct the setting as shown below.
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.
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.
Table 1
• The way of remodelling individual operation of P.C Board of remote controller has changed.
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
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8
PART NAMES AND FUNCTIONS
2
ACCESSORIES
Installation plate
Installation plate fixing screw 4 o25 mm
Remote controller mounting hardware
Fixing screw for 33.5 o16 mm
Battery (AAA) for remote controller
Felt tape (Used for left or left-rear piping)
Deodorizing filter
Air cleaning filter
Wireless remote controller
Drain socket: MUH type
Drain cap: MUH type
1
1
2
1
5
1
2
2
1
1
1
<Indoor unit>
Installation plate
Installation plate fixing screw 4 o25 mm
Remote controller mounting hardware
Fixing screw for 33.5 o16 mm
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
Deodorizing filter
Air cleaning filter
Drain socket
Drain cap
1
2
1
5
1
2
2
1
1
1
1
<Indoor unit>
<Outdoor unit: MUH type><Outdoor unit>
9
0
1
1
2
3
4
5
6
7
8
0
1
1
2
3
4
5
6
7
8
9
MSC-07RV - • MU-07RV -
MSC-09RV - • MU-09RV -
MSC-12RV - • MU-12RV -
MSC-07RV - • MUH-07RV -
MSC-09RV - • MUH-09RV -
MSC-12RV - • MUH-12RV -
MSC-07RV - • MU-07RV -
MSC-09RV - • MU-09RV -
MSC-12RV - • MU-12RV -
MSC-07RV - • MUH-07RV -
MSC-09RV - • MUH-09RV -
MSC-12RV - • MUH-12RV -
MSC-07RV - • MU-07RV -
MSC-09RV - • MU-09RV -
MSC-12RV - • MU-12RV -
MSC-07RV - • MUH-07RV -
MSC-09RV - • MUH-09RV -
MSC-12RV - • MUH-12RV - E4E4
E4E4
E4E4
E4E4
E4E4
E4E4
E3E3
E3E3
E3E3
E3E3
E3E3
E3E3
E2E2
E2E2
E2E2
E2E2
E2E2
E2E2
MSC-07RV - • MU-07RV -
MSC-09RV - • MU-09RV -
MSC-12RV - • MU-12RV -
MSC-07RV - • MUH-07RV -
MSC-09RV - • MUH-09RV -
MSC-12RV - • MUH-12RV - E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
• How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.
Insert the negative pole
of the batteries first.
Check if the polarity of
the batteries are correct.
HEAT
/FAN
/
RESET button
HEAT
/FAN
/
1Remove the front lid and insert batteries.
Then re-attach the front lid. 2Press the RESET button.
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9
MSC-07RV - MSC-09RV - MSC-12RV - E2E2E2
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
OPERATION SELECT button
FAN SPEED CONTROL button
ON-TIMER button
CLOCK SET button
HR. button
MIN. button
(TIME SET button)
TEMPERATURE buttons
VANE CONTROL button
OFF-TIMER button
RESET button
ON/OFF TOO
WARM TOO
COOL
HR. MIN.
CLOCK
RESET
CLOCK
MODE
FAN VANE
START STOP
ECONO COOL button ECONO COOL
I FEEL COOL DRY
HEAT/FAN
600 1 100
AM PM
REMOTE CONTROLLER
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10
MSC-07RV - MSC-09RV - MSC-12RV -
MSC-07RV - MSC-09RV - MSC-12RV - E4E4E4
E3E3E3
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
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
/
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
REMOTE CONTROLLER
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