Mitsubishi MSZ-SF25VE - E1, MSZ-SF35VE - E1, MSZ-SF25VE - E2, MSZ-SF35VE - E2, MSZ-SF42VE - E1 Service Manual

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CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 4

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

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

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

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

7. REFRIGERANT SYSTEM DIAGRAM ··············· 9

8. SERVICE FUNCTIONS ··································· 10

9. MICROPROCESSOR CONTROL ··················· 12

10. TROUBLESHOOTING ····································· 18

11. DISASSEMBLY INSTRUCTIONS ···················· 30

SPLIT-TYPE AIR CONDITIONERS

SERVICE MANUAL

INDOOR UNIT

PARTS CATALOG (OBB600)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

Models

MSZ-SF25VE -

MSZ-SF35VE -

MSZ-SF25VE -

MSZ-SF35VE -

MSZ-SF42VE -

MSZ-SF50VE -

MSZ-SF42VE -

MSZ-SF50VE -

MSZ-SF25VE -

EN1

MSZ-SF35VE -

EN1

MSZ-SF25VE -

EN2

MSZ-SF35VE -

EN2

MSZ-SF42VE -

EN1

MSZ-SF50VE -

EN1

MSZ-SF42VE -

EN2

MSZ-SF50VE -

EN2

No. OBH600

REVISED EDITION-A

Revision A:

• MSZ-SF25/35/42/50VE- E2 and MSZ-SF25/35/ 42/50VE-

EN2

have been added.

Please void OBH600.

Outdoor unit service manual MUZ-SF·VE(H) Series (OBH629) MXZ-C·VA Series (OB584) MXZ-D·VA Series (OBH626) MXZ-8B Series (OCH480)

Prepare the proper tools. Prepare the proper protectors. Provide adequate ventilation. After stopping the operation of the air conditioner, turn off the power-supply breaker and remove the power plug. Discharge the capacitor before the work involving the electric parts.

Do not perform the work involving the electric parts with wet hands. Do not pour water into the electric parts. Do not touch the refrigerant. Do not touch the hot or cold areas in the refrigeration cycle. When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to

touch the live parts.

Use the speciﬁ ed refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

Revision A:

• MSZ-SF25/35/42/50VE- E2 and MSZ-SF25/35/42/50VE-

EN2

have been added.

OBH600A

TECHNICAL CHANGES

MSZ-SF25VE-E1 MSZ-SF25VE-

EN1

MSZ-SF35VE-E1 MSZ-SF35VE-

EN1

MSZ-SF42VE-E1 MSZ-SF42VE-

EN1

MSZ-SF50VE-E1 MSZ-SF50VE-

EN1

1. New model

MSZ-SF25VE-

EN1

MSZ-SF25VE-

EN2

MSZ-SF35VE-

EN1

MSZ-SF35VE-

EN2

MSZ-SF42VE-

EN1

MSZ-SF42VE-

EN2

MSZ-SF50VE-

EN1

MSZ-SF50VE-

EN2

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

OBH600A

ACCESSORIES

MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE

PART NAMES AND FUNCTIONS

Model MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE

Installation plate 1 Installation plate ﬁ xing screw 4 × 25 mm 5 Remote controller holder 1 Fixing screw for 3.5 × 16 mm (Black) 2 Battery (AAA) for remote controller 2 Wireless remote controller 1 Felt tape (For left or left-rear piping) 1

Operation indicator lamp

Remote control receiving section

Emergency operation switch

Horizontal vane

Air inlet

Air ﬁlter (Nano platinum ﬁlter)

Air cleaning ﬁlter (Electrostatic anti-allergy enzyme ﬁlter, option)

Heat exchanger

Front panel

Air outlet

Remote controller

OBH600A

Indoor model MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE

Power supply Single phase 230 V, 50 Hz

Electrical

data

Power input

Cooling

18 22

Heating 24 27 35

Running current

Cooling

0.16 0.18

Heating 0.20 0.22 0.27

Fan

motor

Model RC0J21-AA

Current 1

Cooling

0.16 0.18

Heating 0.20 0.22 0.27 Dimensions W × H × D mm 798 × 299 × 195 Weight kg 10

Special remarks

Air direction 5

Airﬂ ow

Cooling

Super High

546 594 High 432 474 492 Med. 336 402 414 Low 246 348 366 Silent 210 300 336

Heating

Super High

618 660 720 High 492 498 546 588 Med. 402 432 480 Low 246 348 384 Silent 210 300 336

Sound level

Cooling

Super High

dB(A)

42 45 High 36 38 40 Med. 30 34 36 Low 24 31 33 Silent 21 28 30

Heating

Super High

dB(A)

45 46 47 49 High 39 42 43 Med. 34 36 38 Low 24 31 33 Silent 21 28 30

Fan speed

Cooling

Super High

rpm

1,200 1,280 High 1,000 1,070 1,100 Med. 820 940 970 Low 660 850 880 Silent 590 760 820

Heating

Super High

rpm

1,330 1,400 1,500 High 1,100 1,120 1,200 1,270 Med. 940 1,000 1,080 Low 660 850 910 Silent 590 760 820

Fan speed regulator 5

Remote controller model SG11D

NOTE: Test conditions are based on ISO 5151. Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C Outdoor Dry-bulb temperature 35°C Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature 15°C Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C 1 Measured under rated operating frequency.

SPECIFICATION

Specifications and rated conditions of main electric parts

Fuse (F11)

T3.15AL250V

Horizontal vane motor (MV) 12 VDC

Varistor (NR11) S10K300E2K1 (ERZV10D471)

Terminal block (TB)

OBH600A

MSZ-SF25VE

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

COOLING

FUNCTION

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

NC-10

MSZ-SF35VE

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

COOLING

FUNCTION

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

NC-10

NOISE CRITERIA CURVES

Test conditions

Cooling: Dry-bulb temperature 27 °C

Wet-bulb temperature 19 °C Heating: Dry-bulb temperature 20 °C Wet-bulb temperature 15 °C

INDOOR UNIT

WALL

MICROPHONE

0.8m

MSZ-SF42VE

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

COOLING

FUNCTION

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

NC-10

MSZ-SF50VE

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

COOLING

FUNCTION

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

NC-10

OBH600A

Unit: mm

MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE

225225

162.5 162.5

3.5

87.5 87.5

331.5 309.5

215.5

257

258

22235

236

67.5 89.5

108.5

100

()80

193

195

5871

299

577 16061

798

778 10

216.5

Piping

Insulation Φ37 O.D

Liquid line Φ6.35 - 0.39m (Flared connection Φ6.35)

Gas line Φ9.52 - 0.34m [Flared connection Φ9.52 (MSZ-SF25/35/42VE), Φ12.7 (MSZ-SF50VE)]

Drain hose Inslation Φ28 Connected part Φ16 O.D

Piping

Insulation Φ37 O.D

Liquid line Φ6.35 - 0.5m (Flared connection Φ6.35)

Gas line Φ9.52 - 0.43m [Flared connection Φ9.52 (MSZ-SF25/35/42VE), Φ12.7 (MSZ-SF50VE)]

Drain hose Inslation Φ28 Connected part Φ16 O.D

(MSZ-SF25/35/42/50VE-E1 , E2 )

(MSZ-SF25/35/42/50VE-

EN1

EN2

)

11×26 Oblong hole

11×20 Oblong hole

Installation plate

Indoor unit

Wall hole Φ65

Air inAir inAir inAir in

Installation plate

Piping

Drain hose

Air out

OUTLINES AND DIMENSIONS

OBH600A

MSZ-SF25VE MSZ-SF42VE

WIRING DIAGRAM

MSZ-SF35VE MSZ-SF50VE

OBH600A

Indoor heat exchanger

Flared connection

Room temperature thermistor RT11

Flared connection

Refrigerant pipe ø9.52 (MSZ-SF25/35/42VE)

ø12.7 (MSZ-SF50VE)

(with heat insulator)

Refrigerant pipe ø6.35 (with heat insulator)

Indoor coil thermistor RT12 (main)

Indoor coil thermistor RT13 (sub)

Refrigerant flow in cooling Refrigerant flow in heating

Unit: mm

REFRIGERANT SYSTEM DIAGRAM

MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE

OBH600A

8-1. TIMER SHORT MODE

For service, the following set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. (Refer to 10-7.) Set time: 3 minutes → 3 seconds (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:

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 modification, take out the batteries and press the OPERATE/STOP (ON/OFF) button 2 or 3 times at first. After modification, put back the batteries then press the RESET button.

Table 1

1 unit operation 2 units operation 3 units operation 4 units operation

No. 1 unit No modiﬁ cation Same as at left Same as at left Same as at left

No. 2 unit — Solder J1 Same as at left Same as at left

No. 3 unit — — Solder J2 Same as at left

No. 4 unit — — — Solder both J1 and J2

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 accept 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 is turned OFF, or the power supply is shut down. Please conduct the above setting once again after the power has restored.

SERVICE FUNCTIONS

J1 J2

MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE

OBH600A

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. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power.

Operation

If the main power has been cut, the operation settings remain. 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 disable “AUTO RESTART FUNCTION”

Turn off the main power for the unit. Cut the jumper wire to JR77 on the indoor electronic control P.C. board. (Refer to 10-7.)

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 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 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.

JR77

IC171

CN104CN112

Indoor electronic control P.C. board

OBH600A

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