Mitsubishi Electric MSZ-CA25VB, MSZ-CA35VB Service Manual

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SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Wireless type Models

(WH)

MSZ-CA25VB MSZ-CA35VB -

No. OB390

Indication of model name

MSZ-CA25VB MSZ-CA35VB -

NOTE:

This service manual describes technical data of the indoor units.

•As for outdoor units MUZ-CA25VB- and MUZ-CA35VB- , refer to the service manual OB391.

•As for outdoor units MXZ-A14WV- and MXZ-A18WV- , refer to the service manual

OB319.

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················3

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························6

5. OUTLINES AND DIMENSIONS·························7

6. WIRING DIAGRAM ············································8

7. REFRIGERANT SYSTEM DIAGRAM················8

8. SERVICE FUNCTIONS ······································9

9. TROUBLESHOOTING ······································11

10. DISASSEMBLY INSTRUCTIONS·····················22

11. PARTS LIST······················································24

E1E1

TECHNICAL CHANGE

MSZ-A09YV - ➔ MSZ-CA25VB -

MSZ-A12YV - ➔ MSZ-CA35VB -

1. Indication of capacity has been changed.(BTU➔kW)

2. Shape of front panel has been changed.(Dimension has been changed)

3. Indoor electronic control P.C. board has been changed.

E1E1 E1E1

1 2 3 4 5 6 7 8

Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) Air cleaning filter

MSZ-CA25VB -

MSZ-CA35VB -

1 7 1 2 2 1 1 2

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSZ-CA25VB MSZ-CA35VB -

Air cleaning filter (White bellows type)

Panel

Air filter

Air outlet

Vertical vane

Horizontal vane

Operation section

(When the front panel is opened)

Emergency operation switch

Front panel

Air inlet

to Breaker

Power supply cord

Remote control receiving section

Remote controller

Display section

Operation indicator lamp

Receiving section

ACCESSORIES

INDOOR UNIT

ON/OFF

TOO

COOL

TOO

WARM

ON/OFF

FAN

TOO

WARM

TOO

COOL

VANE

MODE

ECONO COOL

STOP

START

HR.

MIN.

AMPM

CLOCK

˚C

RESET CLOCK

I FEEL

COOL

DRY

AUTO

HEAT

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 (back side)

MSZ-CA25VB MSZ-CA35VB -

1.5+ 440V 250V 3.15A

93:5A 250V

MSBPC20 12V 250"

ERZV10D471

S201DH1Y

JM1aN-ZTMP-DC12V

136:i3: 2A

INDOOR UNIT

Item

Model

Indoor fan capacitor Fuse Thermal fuse Vane motor Varistor Solid state relay Terminal block Contactor Indoor fan motor thermal fuse

MSZ-CA25VB -

MSZ-CA35VB -

(C11)

(F11)

(F12)

(MV)

(NR11)

(SR141)

(TB)

(52C)

MSZ-CA25VB -

MSZ-CA35VB -

Indoor model

Function

Power supply

Single phase

230V,50Hz

0.17 35 —

0.17

RC4V19-LA WHT-BLK 413 BLK-RED 334

815O278O217

9 5

3 10 10 10

KM04G

Cooling

504/360

/222

37/29W/21

930/730W/530

Heating

564/402

/246

38/30W/21

1,020/790W/570

Single phase

230V,50Hz

0.19 40 —

0.19

RC4V19-KA WHT-BLK 316 BLK-RED 299

815O278O217

3 10 10 10

KM04G

Cooling

630/462

/288

39/31W/22

990/780W/560

Heating

642/474W/312

38/30

/22

1,000/790W/590

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(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:) Thermistor RT13(at25:) Remote controller model

K /h

A A

A(kW)

dB(A)

rpm

k" k" k"

Electrical

data

Fan

motor

Special

remarks

Capacity

SPECIFICATION

NOTE : Test conditions are based on ISO 5151

Cooling : Indoor DB27: WB19:

Outdoor DB35: WB 24:

Heating : Indoor DB 20: WB15:

Outdoor DB 7: WB 6:

Refrigerant piping length (one way): 5m w Reference value

✽1 Measured under rated operating frequency.

Specifications and rating conditions of main electric parts

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:

APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE

COOLING

FUNCTION

37 38

SPL(dB(A))

LINE

High

FAN SPEED

HEATING

Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:

NOISE CRITERIA CURVES

MSZ-CA25VB -

MSZ-CA35VB -

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

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

NOISE

63 125 250 500 1000 2000 4000 8000

FAN SPEED

High

BAND CENTER FREQUENCIES, Hz

FUNCTION

COOLING

HEATING

SPL(dB(A))

39 38

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

INDOORUNIT

WALL

0.8m

MICROPHONE

OUTLINES AND DIMENSIONS

MSZ-CA25VB -

INDOOR UNIT

Unit: mm

Installation plate

81.5

133.5

4.5

783

815

278

159

Wireless remote controller

606

Indoor unit

81.5

Air in

149

Power supply cord Lead to right 1.0m Lead to left 0.3m

7 or more

Air out

215

217

326326

Installation plate

Liquid line Gas line

{

Insulation

90 110

Drain hose (Connected part O.D)

Insulation

231.5

2.5

81.5

Wall hole

[9.52-0.43m

[37 O.D

[16

[28

271

[65

[6.35-0.5m

[21 I.D

MSC-CA35VB -

INDOOR UNIT

278

159

783

815

606

161.5

Installation plate

Indoor unit

149

Power supply cord Lead to right 1.0m Lead to left 0.3m

Air in

7 or more

Air out

215

217

326326

Installation plate

90 110

161.5

17.5

258

218.5

2.5

81.581.5

Wall hole

Liquid line Gas line

{

Insulation

Drain hose (Connected part O.D)

Insulation

[65

[6.35-0.5m

[9.52-0.43m

[37 O.D

[21 I.D

[16

[28

Wireless remote controller

SYMBOL

C11

F11

F12

SYMBOL

NR11 RT11 RT12 RT13

SR141

SYMBOL

SR142

T11

52C

NAME INDOOR FAN CAPACITOR FUSE (3.15A) THERMAL FUSE (93:) INDOOR FAN MOTOR (INNER FUSE) VANE MOTOR

NAME VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB) SOLID STATE RELAY

NAME SOLID STATE RELAY TRANSFORMER TERMINAL BLOCK CONTACTOR

GRN/YLW

BLK GRY YLW BRN WHT RED

1 2 3 4 5 6

SR141 SR142

C11

RT13 RT12

CN 112

CN 111

CN 121

151

109CN125

1R1

5 2

3 2

RT11

CN211

NR11

ELECTRONIC CONTROL P.C. BOARD

F11

T11

230V~

BRN

RED

WHT

BLU

F12

BLU BLU

1 2

BLU

CN201

52C

12V

TO OUTDOOR UNIT CONNECTING

L 3

12V

TO OUTDOOR

FOR MXZ type

UNIT CONNECTING

REMOTE CONTROLLER

POWER MONITOR RECEIVER

SAFETY DEVICE (FAN)

P.C. BOARD

LD103

GRN

CIRCUIT BREAKER

POWER SUPPLY CORD ~/N 230V 50Hz

BLU

GRN/YLW

WIRING DIAGRAM

MSZ-CA25VB MSZ-CA35VB -

INDOOR UNIT

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

MSZ-CA25VB -

INDOOR UNIT

REFRIGERANT SYSTEM DIAGRAM

Refrigerant pipe [9.52 (with heat insulator)

Indoor coil

Indoor heat exchanger

Indoor coil thermistor RT13(sub)

thermistor RT12(main)

Flared connection

Room temperature thermistor

RT11

Refrigerant flow in cooling Refrigerant flow in heating

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

MSZ-CA35VB -

INDOOR UNIT

Indoor heat exchanger

Room temperature thermistor RT11

Indoor coil thermistor RT13(sub)

Refrigerant pipe [9.52 (with heat insulator)

Indoor coil thermistor RT12(main)

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

Unit:mm

SERVICE FUNCTIONS

MSZ-CA25VB MSZ-CA35VB -

8-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.) 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 : KM04G

NOTE : For remodelling, take out

the batteries and press OPERATE/STOP(ON/OFF) button twice or 3 times at first. After finish remodelling, put back the batteries then press 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 RESET button.

Table 1

1 unit operation No. 1 unit No. 2 unit No. 3 unit No. 4 unit

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.

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

8-3. AUTO RESTART FUNCTION

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

Operation

JR07

IC101

CN151

SW1

CN112

CN111

CN201

52C

C11

CN211

CN1V1

CN1R1

CN121

1 If the main power has been cut, the operation settings remain. 2 After 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.)

How to release “AUTO RESTART FUNCTION”

1Turn off the main power for the unit. 2Pull out the indoor electronic control P.C. board and the power monitor receiver P.C.board. (Refer to 10-1.2.) 3Solder the Jumper wire to JR07 on the indoor electronic control P.C.board. (Refer to 9-7.)

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 can-

celled.

• If the unit has been off with the remote controller before power failure, the auto restart function does not works as the

power button of the remote controller is off.

• To prevent breaker off due to the rush of starting current, systematize other home appliance 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.

RESET button

Housing point

TROUBLESHOOTING

MSZ-CA25VB MSZ-CA35VB -

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 components.

4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring

3. Troubleshooting procedure

1) First, check if 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 check 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.,9-3. and 9-4.

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.

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

NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.

2. This remote controller 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.

2 Press RESET button with tip end of ball point

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

5. How to install the horizontal vanes

Upper vane

Lower vane

In procedures 2,3,5, and 6, lock the stoppers until they click into place.

6 5 4

3 2 1

If horizontal vanes are not installed correctly, both of the operation indicator lamps will blink. In this case, install the horizontal vanes correctly by following the procedures 1 to 6.

NOTE: Before installation of the horizontal vanes, disconnect the power supply plug and/ or turn off the breaker.

The holes on the insertion ends of the upper and lower horizontal vanes different shapes.

Insert this end first.

Upper right

Lower right

Insert this end first.

Stopper

Lock.

Stopper

Lock.

In.

Insert.

In.

INFORMATION FOR MULTI SYSTEM AIR CONDITIONER

Lighted

Blinking

Operation Indicator

OUTDOOR UNIT : MXZ series

Multi system air conditioner can connect two or more indoor units with one outdoor unit.

•Unit won’t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not

connect indoor units beyond the outdoor unit capacity.

•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and

the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units will start the operation later cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same operation mode.

•When indoor units starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes

(max. 10 minutes) to blow out the warm air.

•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant

flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

9-2. Failure mode recall function

Operational procedure

Releasing the failure mode recall function

Note1.Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.

2.If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

3.In case the right lamp of OPERATION INDICATOR lamp is blinking, the indoor unit and outdoor unit are commuicating normally. If its lighting or not lighting, they are not normally communicating.

The cause of abnormality cannot be found because the abnormality doesn't recur.

Setting up the failure mode recall function

Turn ON the power supply. 1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. 2 First, release RESET button. And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds.

Deleting the abnormal condition

1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. 2Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 3Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.

Repair the defective parts.

Release the failure mode recall function by the following procedures. 1With the remote controller headed towards the indoor unit, press any button that is not used in this failure mode recall function (e.g. TIMER button) . OR

1Turn OFF the power supply of the indoor unit and turn ON it again. 2Press RESET button of the remote controller.

Press OPERATE/STOP(ON/OFF) button with the remote controller headed toward the indoor unit, and check if the beeping sound is heard ONCE.

1 While pressing both OPERATION SELECT button and TOO COOL button on the

remote controller at the same time, press RESET button. 2 First, release RESET button. And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds.

Is the left lamp of OPERATION INDICATOR lamp on the indoor unit blinking ?

The indoor unit is abnormal . Check the blinking pattern, and refer to confirm the abnormal point(9-2.2.).

Press OPERATE/STOP(ON/OFF) button with the remote controller headed toward the indoor unit, and check if the beeping sound is heard TWICE.

The outdoor unit is abnormal Check the blinking pattem, and refer to confirm the abnormal point(Service manual OB391).

Did you press OPERATE/STOP(ON/OFF) button for checking the abnormality of the indoor/outdoor unit at least twice?

*Do not press any other buttons except for OPERATE/STOP(ON/OFF) button while the unit is operated in failure mode. (Otherwise, failure mode may be released although it’s up to the model.)

Is the left lamp of OPERATION INDICATOR lamp on the indoor unit blinking ?

Blinking

Yes

Not Blinking

Blinking

Yes

AMPM

CLOCK

AMPM

•As for outdoor unit, refer to service manual OB391.

Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though OPERATION INDICATOR lamp indication listed on the troubleshooting check (9-4.) table disappears, the memorized failure details can be recalled. This model is very useful when the unit needs to be repaired for the abnormality which doesn't recur.

1. Flow chart of the indoor/outdoor unit failure mode recall function

2. Indoor unit failure mode table

5-time flash

2.5-second OFF

Replace the indoor electronic control P.C. board.

Indoor control system

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

7-time flash

2.5-second OFF

Refer to the characteristic of sub indoor coil thermistor(9-7.).

Sub indoor coil thermistor

When the sub indoor coil thermistor shorts or opens circuit is detected every 8 seconds during operation.

3-time flash

2.5-second OFF

Refer to 9-6.A "Check of indoor fan motor".

Indoor fan motor

When the rotational frequency feedback signal is not emited during 12-second the indoor fan operation.

2-time flash

2.5-second OFF

Refer to the characteristic of the main indoor coil thermistor (9-7.).

Main indoor coil thermistor

When the main indoor coil thermistor shorts or opens circuit is detected every 8 seconds during operation.

1-time flash

2.5-second OFF

Refer to 9-6.D "How to check miswiring and serial signal error".

Serial signal error

When the serial signal from the outdoor unit is not received for 4 to 5 seconds.

Not lighted –Normal –

Left lamp of

OPERAITON

INDICTOR

Check point

Abnormal point

(Failure mode)

Detection method

4-time flash every 0.5-second

Refer to the characteristics of room temperature thermistor (9-7.).

Room temperature thermistor

When the room temperature thermistor shorts or opens circuit is detected every 8 seconds during operation.

NOTE:Blinking patterns of this mode differs from the ones of Troubleshooting check table(9-4.).

9-3. Instruction of troubleshooting

Start

Indoor unit operates. Outdoor unit doesn't operate.

Outdoor unit operates in only Test Run operation.

Check room temperature thermistor. Refer to

9-7. "Test point diagram and voltage".

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

Refer to "How to check inverter/ compressor".

Indoor unit operates. Outdoor unit doesn't operate normally.

Unit doesn't operate normal operation in COOL or HEAT mode.

Refer to "Check of R.V. coil".

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

Indoor unit operates, when EMERGENCY OPERATION switch is pressed.

Refer to 9-6.B "Check of remote controller and receiver P.C. board".

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

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

1. Check indoor / outdoor connecting wire. (Check if the power is supplied to the indoor unit.)

2. Refer to 9-6.C "Check of indoor electronic control P.C. board".

As for outdoor unit MUZ type, refer to service manual OB391. As for outdoor unit MXZ type, refer to service manual OB319.

Both lamps (Left and right) Flash on and off at 0.5-second intervals Cause: Indoor unit

• The horizontal vanes are not installed correctly.

Refer to 9-6.E "Check of installation of the horizontal vanes".

Left lamp Flash on and off at

0.5-second intervals Cause: Indoor/ Outdoor unit

• Mis-wiring or trouble of serial signal

Refer to 9-6.D "How to check mis-wiring and serial signal error (when outdoor unit doesn't work)".

Left lamp 2-time flash Cause: Indoor unit

• Trouble of room temp erature/ indoor coil thermistor

Check room temperature thermistor and indoor coil thermistor. Refer to "Test point diagram and voltage".

Left lamp 3-time flash Cause: Indoor unit

• Trouble of indoor fan motor

Refer to 9-6.A "Check of indoor fan motor".

Left lamp 4-time flash Cause: Indoor unit

• Trouble of indoor unit control system

Replace the indoor electronic control P.C. board.

Left lamp 5-time flash Cause: Outdoor unit

• Outdoor power system abnormality

Refer to "How to check inverter/ compressor".

Left lamp 6-time flash Cause: Outdoor unit

• Trouble of thermistor in outdoor unit

Refer to "Check of outdoor thermistors".

Left lamp 7-time flash Cause: Outdoor unit

• Trouble of outdoor control system

Replace the inverter P.C. board or the outdoor electronic control P.C. board.

No.

SymptomOperation indicator lamp Detection method

Check point

Left lamp flashes.

0.5-second ON

0.5-second OFF

Mis-Wiring or serial signal

Outdoor power system

Outdoor thermistors

Outdoor control system

Indoor coil thermistor

3 minutes after power supply turns ON, when the serial signal is not received.

When it consecutively occurs 3 times that compressor stops for overcurrent protection within 1 minute after start-up.

<Thermistor short> Thermistors are abnormal when they short after compressor start-up. <Thermistor open> Thermistors are abnormal when they open after compressor start-up. However, discharge temperature thermistor is abnormal when open circuit is detected more than 10 minutes after compressor start-up.

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

• Shortage of refrigerant

• Refer to "Check of outdoor thermistor".

Refer to service manual OB391 or OB319.

• Refer to "Check of inverter/ compressor".

Refer to service manual OB391 or OB319.

• Replace the inverter P.C. board or the outdoor

electronic control P.C. board.

Refer to service manual

OB391 or OB319.

• Refer to 9-6.D "How to check mis-wiring and serial signal error".

Indoor fan motor

Abnormal

point

Outdoor unit does not operate.

Room temperature thermistor

Left lamp flashes. 2-time flash

2.5-second OFF

When the indoor coil themistor or the room temperature thermistor is short or open circuit every 8 seconds during operation.

• Refer to the characteristics of the indoor coil thermistor, and

the room temperature thermistor (9-7.).

Left lamp flashes. 3-time flash

2.5-second OFF

Indoor fan repeats 12 seconds ON and 3 minutes OFF. When the indoor fan breaks, the fan keeps stopping.

When the rotational frequency feedback signal is not emit during 12-second indoor fan operation.

• Refer to 9-6.A "Check of

indoor fan motor".

Left lamp flashes. 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.

• Replace the indoor electronic

control P.C. board.

Left lamp flashes. 5-time flash

2.5-second OFF

Left lamp flashes. 6-time flash

2.5-second OFF

Outdoor unit does not operate.

0.5-second ON

0.5-second OFF

When the electricity is not conducted to the safety device (FAN) of the horizontal vane.

• Refer to 9-6.E "Check of

installation of the horizontal vanes".

Indoor unit and outdoor unit do not operate.

Attachment of the horizontal vane

Both lamps flash at the same time.

Operation Indicator

MXZ type

Operation mode setting

Lighted

Blinking

Outdoor unit operates but indoor unit does not operate.

When the operation mode of each indoor unit is differently set to COOL(includes DRY) and HEAT at the same time, the operation mode of indoor unit that has operated at first has the priority.

• Unify the operation mode. Refer to service manual OB319.

2.5-second OFF

Right lamp flashes

Left lamp flashes. 7-time flash

2.5-second OFF

9-4. Troubleshooting check table

Operation Indicator

· Flashing of the OPERATION INDICATOR lamp (left-hand side or both lamp) indicates possible abnormalities.

· The OPERATION INDICATOR lamp (left-hand side lamp) is lighting during normal operation.

Lighted

Not lighted

• The following indication applies regardless of shape of the indicator.

Blinking

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

Self check table

9-5. Trouble criterion of main parts

Part name FigureCheck method and criterion

Indoor fan motor(MF) INNER FUSE

136i 3: CUT OFF

WHT – BLK

BLK – RED

Abnormal

Open or

short-circuit

Normal MSZ-CA25VB 303 " ~ 329 " 287 " ~ 311 "

MSZ-CA35VB 396 " ~ 430 " 320 " ~ 348 "

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

Normal

8 k" ~ 20 k"

Abnormal

Open or short-circuit

Room temperature thermistor(RT11)

Indoor coil thermistor (RT12(MAIN), RT13(SUB))

Vane motor(MV)

Motor part

Sensor part

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

BRN – YLW YLW – GRY

Abnormal

Remain 0V or 5V

Normal

4.5 ~ 5.5V

Measure the voltage power ON.

(When fan revolved one time)

0V➔5V➔0V

(Approx.)

Normal

BRN-other one

Abnormal

Open or short-circuit

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

Color of lead wire

BLK

RED

WHT

GRY

YLW

BRN

240 " ~ 260 "

Color of lead wire

MAIN AUX.

FUSE

RED

YLW BRN

ORN

GRN

ROTOR

MSZ-CA25VB - MSZ-CA35VB -

E1E1

9-6. Troubleshooting flow

When OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate.

Check of indoor fan motor

Reconnect the lead wires.

Are lead wires connected?

Disconnect the lead wires from the connector (Indoor fan motor). Measure the resistance between lead wires No.1 and No.5 and then No.3 and No.5 of the indoor fan motor on CN211.

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

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

Yes

Replace the indoor fan motor.

Yes ( 0 or ∞ )

Is soldered point of the connector correctly soldered?

Replace the indoor electronic control P.C. board.

(others)

Yes

Resolder it.

Indoor electronic control P.C. board

Varistor (NR11)

Indoor electronic control P.C. board

Fuse (F11)

1 3

CN201

F12

N 2 3

Thermal fuse connector

Terminal

block

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

Replace the fuse.

Is fuse (F11) blown?

Replace the fan motor.

Is winding resistance of fan motor 0 "?

Is winding resistance of vane motor 0 "?

Yes

Replace the vane motor.

Yes

Is varistor (NR11) burnt?

Replace the varistor.

Yes

Turn OFF the power supply. Disconnect indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply.

Does the unit operate with the remote controller or does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch?

Yes

Turn OFF the power supply.

Replace the indoor electronic control P.C. board.

Measure the resistance between CN201

1 on

the indoor electronic control P.C. board and

on the terminal block with the tester.

Is resistance approx. 0"?

Replace the fuse (F12).

Yes

(∞)

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

CN302

CN125

CN109

1 2

3 1

5 4 3

Remote controller

Indoor electronic control P.C. board

Power monitor receiver P.C. board

Check of remote controller and receiver P.C. board

wCheck if the remote controller is exclusive for this air conditioner.

Switch on the remote controller.

Is LCD display on the the remote controller visible?

Yes

Remove the batteries, then set them back and press RESET button. (Refer to 9-1.4.) Check if the unit operates with the remote controller.

Does the unit operate with the remote controller?

Yes

No (not clear)

Replace the batteries.(Refer to 9-1.4.)

Turn on a radio to AM and press switch on

the remote controller.

Is noise heard from the radio?

Yes

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 CN302 No.3(-) and No.5(+) when the remote controller button is pressed.

Is the voltage approx. 4V DC?

No(5V or 0V DC)

Yes

Replace the remote controller.

● Reinstall the unit away from lights.

● Attach a filter on receiving part.

Replace the indoor electronic control P.C.

board.

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

Replace the receiver P.C. board.

When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.

Replace the indoor/ outdoor connecting wire.

Is there voltage approximate 280V DC between LD61A (+) and LD66A (–) on the inverter P.C. board arter 3 minutes?

Turn OFF the power supply and then turn ON again. Press EMERGENCY OPERATION switch. After 3 minutes, is there approximate 230V AC between outdoor terminal block 2 and N?

w4 Replace the inverter P.C.

board.

Does the right side of OPERATION INDICATOR lamp blink quickly?

w2 Mis-wiring may damage indoor electronic

control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts.

Replace the indoor electronic control P.C. board.

Replace the indoor/ outdoor connecting wire.

Release the failure mode. w3

Yes

Turn OFF the power supply. Disconnect the indoor/ outdoor connecting wire. Short-circuit indoor terminal block N and 3. Turn ON the power supply. While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. At first, release RESET button. And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds. Transmit the signal of remote controller, pressing OPERATE/STOP (ON/OFF) button on the remote controller. (The above procedure allows OPERATION INDICATOR lamp to indicate the failure-mode.)

Remove the short-circuit between indoor terminal block N and 3. Reconnect the indoor/ outdoor connecting wire. Turn ON the power supply. Press EMERGENCY OPERATION switch. Is there amplitude of 5 to 10V DC between outdoor terminal block N and 3 after 3 minutes (for confirmation of serial signal)?

1. Turn OFF the power supply.

2. Disconnect the connector (CN61) between the compressor and the power transistor module.

3. Turn ON the power supply.

4. Press EMERGENCY OPERATION switch.

Yes

(light up or OFF)

Is mis-wiring indicated when the contactor (52C) on the indoor electronic control P.C. board turns ON 3 minutes later?

Yes

· Turn OFF inverter-controlled lighting equipment.

· Turn OFF the power supply and then turn ON again.

· Press EMERGENCY OPERATION switch.

· Reinstall either the unit or the light each other away.

· Attach a filter on receiving section of the indoor unit.

w3 Be sure to release the failure-mode

recall function after checking.

w4 Be careful to the residual voltage of smoothing capacitor.

Procedure of release of failure-mode. 1 Press EMERGENCY OPERATION

switch.

2 Turn OFF the power supply. 3 Press RESET button on the

remote controller.

Start

• Turn ON the power supply.

•

Press once EMERGENCY OPERATION switch.

Is there any mis-wiring, poor contact, or wire disconnection? w2

Make them sure.

Yes

After 3 minutes, mis-wiring is indicated (0.5-second ON, 0.5-second OFF) on OPERATION INDICATOR lamp on indoor unit.w

w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self-check to be displayed in 3 seconds.

Yes

Is there 230V AC between outdoor terminal block 2 and N?

Replace the indoor/ outdoor connecting wire.

•The following indication applies regardless of shape of the indicator.

Blinking

Operation Indicator

As for outdoor unit MUZ type, refer to service manual OB391. As for outdoor unit MXZ type, refer to service manual OB319.

AMPM

CLOCK

AMPM

Outdoor unit does not operate.

How to check mis-wiring and serial signal error (when outdoor unit does not work)

When both OPERATION INDICATOR lamps flash 1-time.

Indoor unit and outdoor unit don’t operate.

Check of installation of the horizontal vanes

Start

Turn OFF the power supply.

Is the stopper of the horizontal vane locked to the indoor unit correctly?

Yes

Relock the stopper of the horizontal vane to the indoor unit. Refer to 9-1.5.

Turn ON the power supply.

To check the continuity of safety device, measure the resistance of connector 1 - 3 connected to CN1R1 on the indoor electronic control P.C. board.

Is there resistance 0 "?

Yes

Replace the indoor electronic control P.C. board.

Check of thermal fuse

Turn OFF the power supply.

No(∞)

Is OPERATION INDICATOR lamp flashing?

Yes

Turn OFF the power supply.

Replace the safety device.

Is resistance ∞ between the connector CN 201 1 on indoor electronic control P.C. board and the terminal block N?

Yes

Replace the thermal fuse (F12).

Indoor electronic control P.C. board

CN201

9-7. Test point diagram and voltage

MSZ-CA25VB - MSZ-CA35VB Indoor electronic control P.C. board

E1E1

Fuse F11 250V AC 3.15A

Power supply input 230V AC

}

R132

Indoor fan motor 230V AC

}

Safety device of fan by horizontal vane CN1R1

Varistor (NR11)

J12

12V

{

J33

–

Power monitor receiver P.C. board

J33

–

}

5V DC

J23

Room temperature thermistor RT11

Indoor coil thermistor RT12(MAIN)

Indoor coil thermistor RT13(SUB)

Timer short mode point JPG, JPS

}

(Refer to 8-1.)

Emergency operation switch

Release of Auto restart function Solder the Jumper wire to the JR07. (Refer to 8-3.)

Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)] Room temperature thermistor (RT11)

CN302

Resistance (k")

Temperature (:)

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the

locking mechanism.

1Slide the sleeve. 2Pull the terminal while

pushing the locking lever.

1Hold the sleeve, and pull out the terminal slowly.

The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching.

<"Terminal with locking mechanism" Detaching points>

Connector

Sleeve

Locking lever

DISASSEMBLY INSTRUCTIONS

10-1. MSZ-CA25VB - MSZ-CA35VB -

INDOOR UNIT

OPERATING PROCEDURE

1. Removing the panel

(1) Remove the screw caps of the panel.

Remove the screws.

(2) Pull the panel down to your side slightly and unhook the

catches at the top.

2. Removing the electronic control P.C. board and the power monitor receiver P.C. board

NOTE : In case of removing only indoor electronic control

P.C. board work (3) is not necessary. (1) Remove the panel. (Refer to 1.) (2) Remove the power monitor receiver P.C. board holder from

the bottom of electrical box.

(3) Open the power monitor receiver P.C. board holder and

remove the power monitor receiver P.C. board.

(4) Remove the screw of the electrical cover and the electrical

cover. (5) Remove the screw of the V.A. clamp and the V.A. clamp. (6) Remove the screw of the cord clamp and the cord clamp. (7) Remove the screw of the terminal block. (8) Remove the screw of the ground wire. (9) Pull out indoor electronic control P.C. board slightly. (10)

Disconnect all (except CN109, CN125) the connectors on

the electronic control P.C. board. (11)

Remove the electronic control P.C. board.

(12)

Disconnect the connector of power monitor receiver P.C.

board (CN109, CN125) on the electronic control P.C.

board.

E1E1

Photo 1

Screws of the front panel

Photo 2

Screw of the ground wire

Power monitor receiver P.C. board holder

PHOTOS

Terminal block fixing screw

Indoor electronic control P.C. board

Cord clamp fixing screw

Screw of the V.A. clamp

Screw of the electrical cover

OPERATING PROCEDURE

PHOTOS

3. Removing the electrical box

(1) Remove the panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Remove the V.A. clamp. (Refer to 2.) (4) Remove the cord clamp. (Refer to 2.) (5) Remove the terminal block. (Refer to 2.) (6) Remove the screw of ground wire. (Refer to 2.) (7) Disconnect the connector of the indoor coil thermistor

(CN112), the fan motor connector (CN211 and CN121), the vane motor connector (CN151) and the connector of the safety device (CN1R1) on the electronic control P.C. board.

(8) Remove the fan motor lead wire and indoor coil thermistor

from the electrical box.

(9) Remove the lead wire of vane motor and safety device from

the bottom of electrical box.

(10)

Remove the screw fixing the electrical box, remove the

electrical box.

4. Removing the nozzle assembly and the vane motor

(1) Remove the panel. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) Pull out the drain hose from the nozzle assembly, remove

the nozzle assembly.

(4) Remove the screws of the vane motor, disconnect the

vane motor connector.

(5) Remove the vane motor.

Photo 3

Photo 4

Indoor coil thermistor connector

Fan motor connector

Screws of the vane motor

Vane motor connector

Screw of the electrical box

5. Removing the indoor fan motor and the line flow fan

(1) Remove the panel. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) Pull out the drain hose from the nozzle assembly, remove

the nozzle assembly. (Refer to 4.) (4) Remove the screw of the lead cover and the lead cover. (5) Remove the lead wire of the fan motor from the motor band

/ bed. (6) Release the hooks of the motor band from the motor bed

and open it slightly. (7) Loosen the hexagon socket set screw of the line flow fan. (8) Remove the screws fixing the motor bed, remove the fan

motor with motor band and the motor bed. (9) Remove the screws fixing the left side of the heat

exchanger. (10)

Lift the left side of the heat exchanger.

(11)

Remove the line flow fan.

Photo 6

Screw of the lead

cover

Hexagon socket set screw

Hooks of the motor band

Drain hose

Photo 5

Screws of the left side of the heat exchanger

Photo 7

Screws of the motor bed

PARTS LIST11

MSZ-CA25VB - (WH) MSZ-CA35VB - (WH)

11-1. INDOOR UNIT STRUCTURAL PARTS

1 (w)

3 4

9 (w)

8 7 (See 11-5.)

11-2. ACCESSORY AND REMOTE

CONTROLLER

(w) These figures show about MSZ-CA35VB.

11-1. INDOOR UNIT STRUCTURAL PARTS

Symbol

No.

E02 763 234

E02 764 234

E02 965 000

E02 763 067

E02 965 010

E02 408 142 E02 763 100

E02 764 100 7 8

E02 763 975

E02 408 970 9

E02 751 970

Part No.

Part name

BOX (WH) BOX (WH) PANEL ASSEMBLY (WH) SCREW CAP FRONT PANEL (WH) CATCH CATECHIN AIR FILTER CATECHIN AIR FILTER AIR CLEANING FILTER CORNER BOX (RIGHT) INSTALLATION PLATE INSTALLATION PLATE

in Wiring

Diagram

11-2. ACCESSORY AND REMOTE CONTROLLER

E02 838 426

E02 527 083

REMOTE CONTROLLER REMOTE CONTROLLER HOLDER

Q'ty/unit

MSZ-CA25VB

(WH)

1 2 1 2 2

2 1 1

1 1

MSZ-CA35VB

(WH)

1 1 2 1 2

2 2 1

1 1

KM04G

Remarks

Including No.3,4,5 2PCS/SET

2PCS/SET

MSZ-CA25VB - (WH) MSZ-CA35VB - (WH)

11-3. INDOOR UNIT ELECTRICAL PARTS

11-4. INDOOR UNIT HEAT EXCHANGER

AND FUNCTIONAL PARTS

SLEEVE BEARING

4 5 6

ROOM TEMPERATURE THERMISTOR

23 24

FUSE

VARISTOR

(W) This figure shows about MSZ-CA35VB.

22 (W)

11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

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

(WH)

1 1 1 1 1 1 1 1 1 1 1 1

1 1 1

1 1

Q'ty/unit

MSZ-CA35VB

(WH)

1 1 1 1 1 1 1 1 1 1 1

1 1 1

1 1

No. Part No.

E02 001 504

E02 661 702

E02 838 235

E02 815 316

E02 965 040

E02 965 041

E02 127 382

E02 829 385

E02 749 385

E02 763 034

E02 815 468 E02 965 452

E02 966 452

E02 749 303

E02 151 308 E02 749 300

E02 751 300

E02 749 333

E02 679 375 E02 838 307

E02 839 307

E02 749 302 E02 408 509

E02 751 509

E02 408 381

WIncluding FAN MOTOR RUBBER MOUNT(2 pcs/set)

SLEEVE BEARING DRAIN HOSE NOZZLE ASSEMBLY (WH) SAFETY DEVICE VANE UPPER VANE LOWER FUSE VARISTOR VARISTOR VANE CRANK SET POWER MONITOR RECEIVER P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD VANE MOTOR ROOM TEMPERATURE THERMISTOR INDOOR FAN MOTORw INDOOR FAN MOTORw MOTOR BAND TERMINAL BLOCK INDOOR COIL THERMISTOR INDOOR COIL THERMISTOR LINE FLOW FAN BEARING MOUNT BEARING MOUNT THERMAL FUSE

Part name

Symbol

in Wiring

Diagram

NR11 NR12

RT11

RT12, RT13 RT12, RT13

MSZ-CA25VB

F11

MF MF

F12

3.15A

AUTO RESTART AUTO RESTART

RC4V19RC4V19-

93:

Remarks

11-4. INDOOR UNIT HEAT EXCHANGER

E02 838 620

E02 839 620 E02 815 666

E02 151 666 E02 151 667

INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION (GAS) UNION (GAS) UNION (LIQUID)

1 1

{9.52 {9.52 {6.35

11-5. AIR CLEANING FILTER

MAC-1300FT

Model Part No.

MSZ-CA25VB - MSZ-CA35VB -

E1 E1

● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.

● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible.

● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.

● DO NOT reuse AIR CLEANING FILTER even if it is washed.

● DO NOT remove or attach AIR CLEANING FILTER during unit operation.

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

New publication, effective Feb. 2005 Specifications subject to change without notice.

Mitsubishi Electric MSZ-CA25VB, MSZ-CA35VB Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual