Mitsubishi Electronics MSZ-FA25VA User Manual

SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Wireless type Models

(WH)

MSZ-FA25VA MSZ-FA35VA -

No. OB371

Indication of model name

MSZ-FA25VA MSZ-FA35VA -

NOTE:

This service manual describes technical data of the indoor units.

•As for outdoor units MUZ-FA25VA- , MUZ-FA35VA- , MUZ-FA25VAH- and MUZ-FA35VAH- , refer to service manual OB372.

•As for outdoor units MXZ-3A54VA- , MXZ-4A71VA- and MXZ-4A80VA- ,

refer to service manual OB377.

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·····················31

11. PARTS LIST······················································35

12. OPTIONAL PARTS ···········································38

E1E1E1

TECHNICAL CHANGES

MSZ-A09YV - ➔ MSZ-FA25VA -

MSZ-A12YV - ➔ MSZ-FA35VA -

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

2. Controller method between indoor and outdoor has been changed.

3. Power supply method has been changed (change to supply from outdoor unit).

4. Power supply cord has been removed.

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

6. Position of terminal block has been changed.

7. Indoor fan motor has been changed. ( AC ➔ DC)

8. Indoor heat exchanger has been changed.

9. The horizontal vane motor unit has been changed. An external gear is added to the generalized stepping motor. The unit is structured so that the driving torque and stopping torque would increase.

Generalized stepping motor

NOTE: Do not remove the vane motor from the motor unit.

Do not disassemble the horizontal vane motor unit.

E1E1 E1E1

10. The vertical vane motor unit has been added. An external gear is added to the generalized stepping motor. The unit is structured so that the driving torque and stopping torque would increase.

Generalized stepping motor

NOTE: Do not remove the vane motor from the motor unit.

Do not disassemble the vertical vane motor unit.

11. Front panel driving motor unit which opens and closes the front panel has been added.

Front panel opening/closing

output gear

NOTE: Do not disassemble the front panel driving motor unit.

12. PLASMA DEODORIZING/AIR PURIFYING filter units have been added.

13. i-see Sensor has been added.

(i-see control operation and AREAsetting have been added.)

14. Air cleaning filer has been removed.

15. Signal of remote controller has been changed. (It is not available for the conventional models.)

16. Symbol on terminal block has been changed (to S1/S2/S3).

Line flow fan

Air outlet

Vertical vane

Air inlet

Display section

Front panel

PLASMA DEODORIZING filter

Panel

Heat exchanger

Horizontal vane

Operation section

(When the front panel is opened)

Remote controller

POWER lamp

Remote control receiving section

PLASMA AIR PURIFYING filter

Anti-mold air filter

Fan guard

i-see Sensor

PLASMA/WASH lamp

AREA lamp

Emergency operation switch

WASH reset switch

Auto front panel

When the unit starts operating, the front panel opens automatically to draw in air. When the unit stops operating, the front panel closes automatically.

AREA lamp indicate AREA setting

In AREA setting, the horizontal air flow direction changes automatically according to the detection of i-see Sensor which detects the floor/ wall temperature to air-condition the room evenly.

i-see control operation

i-see sensor constantly measure floor/wall temperature to automatically adjust to the set temperature by estimating the temperature actually perceived by a person inside the room ("sensible temperature").

Auto front panel

PART NAMES AND FUNCTIONS

INDOOR UNIT

MSZ-FA25VA MSZ-FA35VA -

1 2 3 4 5 6 7

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)

MSZ-FA25VA -

MSZ-FA35VA -

1 5 1 2 2 1 1

ON-TIMER button

CLOCK SET button

TIME SET buttons FORWARD button BACKWARD button

VANE CONTROL button (Horizontal vane button)

OFF-TIMER button

i-see button

(This diagram shows an overall view.)

Open the front lid.

PLASMA button

AREA button

RESET button

WIDE VANE button (Vertical vane button)

Signal transmitting section

Operation display section

Temperature buttons

OPERATE/STOP (ON/OFF) button

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

Indication of remote controller model is on back

MSZ-FA25VA MSZ-FA35VA -

ACCESSORIES

REMOTE CONTROLLER

T3.15AL250V

NSEJ001DA1 12V DC 100" (at 25˚C)

MP20Z 12V DC 300" (at 25˚C) MSBPC20M16 12V DC 250" (at 25˚C) MSBPC20M11 12V DC 300" (at 25˚C)

ERZV14D471

A2TPMI334F0V50HSOBA060P5L1J4S 5V DC

INDOOR UNIT

Item

Model

Fuse Front panel driving motor i-see Sensor motor Horizontal vane motor Vertical vane motor Varistor i-see Sensor Terminal block

MSZ-FA25VA -

MSZ-FA35VA -

(F11)

(MP)

(MT) (MV1) (MV2)

(NR11)

(RR)

(TB)

MSZ-FA25VA -

MSZ-FA35VA -

Indoor model

Function

Power supply

Single phase

230V,50Hz

0.25 33 — 57

0.25

RC0J40-EB

780O298O198

36W/29W/21

4 10 10 10

KM05A

Cooling

594

474W/354W/252

1,220

1,010W/800W/610

Heating

612

498W/384W/264

1,250

1,050W/850W/640

Single phase

230V,50Hz

0.25 33 — 57

0.25

RC0J40-EB

780O298O198

36W/29W/22

4 10 10 10

KM05A

Cooling

594

474W/354W/258

1,220

1,010W/800W/630

Heating

612

498W/384W/276

1,250

1,050W/850W/660

Air flow(Super High) Air flow(HighW/Med.W/LowW) Power outlet Running current ✽1 Power input ✽1 Auxiliary heater Power factor ✽1 Fan motor current ✽1 Model Dimensions WOHOD Weight Air direction Sound level(Super High) Sound level(HighW/Med.W/LowW) Fan speed(Super High) Fan speed(HighW/Med.W/LowW) Fan speed regulator Thermistor RT11(at25:) Thermistor RT12(at25:) Thermistor RT13(at25:) Remote controller model

K /h K /h

A A

A(kW)

dB(A) dB(A)

rpm rpm

k" k" k"

Electrical

data

Fan motor

Special

remarks

Capacity

MSZ-FA25VA -

MSZ-FA35VA -

Indoor model

Function

Cooling

546

450W/348W/252

1,130

960W/790W/610

Heating

540

420W/372W/264

1,120

910W/830W/640

Cooling

516W/390W/258

1,080W/860W/630

Heating

522W/402W/276

1,090W/880W/660

Air flow(Super High) Air flow(HighW/Med.W/LowW) Sound level(Super High) Sound level(HighW/Med.W/LowW) Fan speed(Super High) Fan speed(HighW/Med.W/LowW)

K /h K /h

dB(A) dB(A)

rpm rpm

Special

remarks

Capacity

36W/29W/21

642

36W/29W/22

1,300

SPECIFICATION

When outdoor unit is MXZ type.

NOTE : Test conditions are based on ISO 5151

Specifications and rating conditions of main electric parts

Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19: Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15: Refrigerant piping length (one way): 5m

w Reference value

Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24: Outdoor Dry-bulb temperature 7: Wet-bulb temperature 6:

✽1 Measured under rated operating frequency.

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

COOLING

FUNCTION

42 42

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

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

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

INDOORUNIT

WALL

MICROPHONE

0.8m

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

42 42

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

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

NOISE CRITERIA CURVES

MSZ-FA25VA -

MSZ-FA35VA -

OUTLINES AND DIMENSIONS

MSZ-FA25VA MSZ-FA35VA -

INDOOR UNIT

298

53.5 102624.5

780

11o26 Oblong hole

Installation plate

Indoor unit

41.5 215

100

Air out

11o20 Oblong hole

155 155

335 320

Air in

198 5

or more7

106

Wall hole

Installation plate

Liquid line [6.35 - 0.5m Gas line [9.52 - 0.43m Insulation [35 O.D

{

[19 I.D

Drain hose [16 (Connected part O.D)

Insulation [28

5555 225 225

214

7055

Unit : mm

14273.5

234

3 287.5

42.5

[65

159

Wireless remote controller

Required space (Indoor unit)

75 or more

10 or more

75 or more

55 or morew

wIn case of left, left back, or

left under piping (using spacer),

113 or more

SYMBOL

DB111

F11

MP MT

MV1

SYMBOL

MV2

NR11 PLASMA_A PLASMA_D

RT11

SYMBOL

RT12 RT13

T111

NAME DIODE STACK FUSE (T3.15AL250V) INDOOR FAN MOTOR FRONT PANEL DRIVING MOTOR i-see Sensor MOTOR VANE MOTOR (HORIZONTAL)

NAME VANE MOTOR (VERTICAL) VARISTOR PLASMA AIR PURIFYING FILTER UNIT PLASMA DEODORIZING FILTER UNIT i-see Sensor ROOM TEMPERATURE THERMISTOR

NAME INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB) TRANSFORMER TERMINAL BLOCK

WIRING DIAGRAM

MSZ-FA25VA MSZ-FA35VA -

INDOOR UNIT

TO OUTDOOR UNIT CONNECTING

GRN

MV1

230V~

12-24V

LD104

151

MV2

MODELS WIRING DIAGRAM

S1 S2 S3

1R1

INTERLOCK SWITCH(FAN)

POWER MONITOR RECEIVER P.C. BOARD

BLK BLU

RED

101(A)

105(T)

SW P.C. BOARD

TAB3

2 1

CN201

F11

NR11

110

DB111

INDOOR ELECTRONIC CONTROL P.C. BOARD

T111

1T1

1T2

PLASMA_DPLASMA_A

SAFETY DEVICE (PLASMA UNIT)

1U1

112

4 3 2 1

111

1 2 3 4 5 6

CN211

RED BLK

WHT YLW BLU

RT13 RT12

RT11

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-FA25VA -

INDOOR UNIT

REFRIGERANT SYSTEM DIAGRAM

Refrigerant pipe [9.52

MSZ-FA35VA -

INDOOR UNIT

(with heat insulator)

Indoor coil

Indoor heat exchanger

thermistor RT12(main)

Flared connection

Indoor heat exchanger

Indoor coil thermistor RT13(sub)

Room temperature thermistor RT11

Indoor coil thermistor RT12(main)

Indoor coil thermistor RT13(sub)

Unit : mm

Refrigerant pipe [9.52 (with heat insulator)

Flared connection

Refrigerant flow in cooling Refrigerant flow in heating

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

SERVICE FUNCTIONS

MSZ-FA25VA MSZ-FA35VA -

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 : KM05A

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.

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.

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.

Operation

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”

JR07

CN151 CN211CN112 CN1R1

CN212

CN1T1CN1T2

CN130

IC156

8-4. Remote controller

Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.

Area Left Center Right

Position of

the slide

switch

Display on

the remote

controller

Where is the indoor unit installed in your room?

Installed at left , if the distance is not more than 50 cm.

NOTE:If the indoor unit is installed more than 50 cm away from the side walls, cabinets or other nearby objects, set the slide

switch to the “center” position.

Installed at right, if the distance is not more than 50 cm.

Is the indoor unit installed at right, left or center?

(Left) (Center) (Right)

Side swich

1Turn off the main power for the unit. 2Solder 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

cancelled.

• 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.

Stopper

Lock.

Left

Insert this end first.

RESET button

Housing point

TROUBLESHOOTING

MSZ-FA25VA MSZ-FA35VA -

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 turn off the unit first with the remote controller, 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.

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 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.

Lead wiring

2 Press RESET button with tip end of ball point pen

or the like, and then use the remote controller.

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.

5. How to install the horizontal vane

If horizontal vane is not installed correctly, All of the operation indicator lamps will blink. In this case, install the horizontal vane correctly by following the procedures 1 to 2.

NOTE: Before installation of the horizontal vane, turn OFF the power supply.

In procedure

stoppers until they click into place.

lock the

WASH

reset

E.O. SW

Plasma element holder

6. How to remove and install PLASMA DEODORIZING / AIR PURIFYING filter units

If PLASMA/WASH lamp on the indoor unit blinks, clean the filters as soon as possible. The lamp will start blinking when accumulated operating time exceeds 330 hours.

Figure 1.

(1) Switch the indoor unit OFF with the remote controller and

disconnect the power supply plug and/ or turn OFF the breaker. NOTE: Otherwise, you may get injured since PLASMA

DEODORIZING/AIR PURIFYING filter units are charged with high voltage.

(2) Hold the knobs on both sides of the front panel and lift the

panel up until its level. (3) Remove the anti-mold air filter.(See Figure 1.) (4) Remove PLASMA DEODORIZING/AIR PURIFYING filter

units. (See Figure 2.)

Figure 2.

Install PLASMA DEODORIZING/AIR PURIFYING filter units by following the removal procedure in reverse.

(1) Insert the top of PLASMA DEODORIZING/AIR PURIFYING filter

units into the aperture in the plasma element holder.

Figure 3.

(See Figure 3.) (2) Push in PLASMA DEODORIZING/AIR PURIFYING filter units

until they click into place.

•The front panel does not close if PLASMA DEODORIZING/AIR PURIFYING filter units are not installed properly.

(3) Install the anti-mold air filter. (4) Connect the power supply plug and/ or turn ON the breaker. (5) Press WASH reset switch. A short “beep” is heard and the blinks

of PLASMA/WASH lamp will be cancelled. Make sure PLASMA/ WASH lamp is not blinking at the start of operation next time. (See Figure 4.)

(6) Hold both sides of the front panel and close the front panel.

Figure 4.

(7) Press the 3 positions on the front panel as indicated by the

arrows.(See Figure 5.)

NOTE: Install PLASMA DEODORIZING/AIR PURIFYING filter units only when they are completely dry. If the filter unit remains wet, PLASMA/WASH lamp may blink and the plasma function may be disabled.(When PLASMA DEODORIZING/AIR PURIFYING filter units are cleaned.)

Figure 5.

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