Mitsubishi MSZ-HR42VF-E1, MSZ-HR35VF-E1, MSZ-HR42VF-ET1, MSZ-HR50VF-E1, MSZ-HR42VF-ER1 Service Manual

Models

MSZ-HR25VF

-

E1, ER1, ET1

MSZ-HR35VF

-

E1, ER1, ET1

MSZ-HR42VF

-

E1, ER1, ET1

MSZ-HR50VF

-

E1, ER1, ET1

INDOOR UNIT

No. OBH822

Outdoor unit service manual
MUZ-HR∙VF Series (OBH823)

PARTS CATALOG (OBB822)

CONTENTS

1. TECHNICAL CHANGES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 2

2. PART NAMES AND FUNCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 3

3. SPECIFICATION ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 4

4. NOISE CRITERIA CURVES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 5

5. OUTLINES AND DIMENSIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 6

6. WIRING DIAGRAM ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 7

7. REFRIGERANT SYSTEM DIAGRAM ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 8

8. SERVICE FUNCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 10

9. MICROPROCESSOR CONTROL ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 12

10. TROUBLESHOOTING ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 16

11. DISASSEMBLY INSTRUCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 29

SERVICE MANUAL

MSZ-HR25VF

2

Use the speci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.

TECHNICAL CHANGES

1

MSZ-HR25VF -E1,

ER1, ET1

MSZ-HR35VF -E1,

ER1, ET1

MSZ-HR42VF -E1,

ER1, ET1

MSZ-HR50VF -E1,

ER1, ET1

1. New model

<Preparation before the repair service>

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.

<Precautions during the repair service>

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.

OBH822

3

PART NAMES AND FUNCTIONS

2

MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF

ACCESSORIES

Model

MSZ-HR25VF
MSZ-HR35VF
MSZ-HR42VF
MSZ-HR50VF

Installation plate 1

Installation plate xing screw 4 × 25 mm 5

Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Battery (AAA) for remote controller 2

Operation indicator lamp

Remote control receiving section

Horizontal vane

Air inlet

Air filter

Front panel

Air outlet

Heat exchanger

Emergency operation switch

Air cleaning filter

(Silver-ionized
air purifier filter,
option)

Remote controller

OBH822

4

SPECIFICATION

3

Indoor model MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF

Power supply Single phase 230 V, 50 Hz

Electrical

data

Power input

1

Cooling

W

20 28 32 39

Heating 20 28 32 39

Running
current

1

Cooling

A

0.20 0.27 0.30 0.36

Heating 0.20 0.27 0.30 0.36

Fan

motor

Model RC0J30-CV

Current

1

Cooling

A

0.20 0.27 0.30 0.36

Heating 0.20 0.27 0.30 0.36

Dimensions W × H × D mm 838 × 280 × 228

Weight kg 8.5 9.0

Special remarks

Air direction 5

Airow

Cooling

Super High

m

3

/h

582 702 786

High 432 468 648 672

Med. 324 336 522

Low 216 360 384

Heating

Super High 606 630 804 870

High 444 648 672

Med. 324 474 498

Low 198 336 366

Sound level

Cooling

Super High

dB(A)

43 46 45

High 37 38 39 40

Med. 30 31 34 36

Low 21 22 24 28

Heating

Super High 43 44 46 47

High 37 40 41

Med. 30 32 34

Low 21 24 27

Fan speed

Cooling

Super High

rpm

1,120 1,280 1,130

High 900 950 970 1,000

Med. 730 750 830 860

Low 550 630 660

Heating

Super High 1,150 1,180 1,150 1,220

High 920 970 1,000

Med. 730 770 800

Low 520 600 640

Fan speed regulator 4

Remote controller model RH18A

NOTE: Test conditions are based on IS 1391.
Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C

Outdoor Dry-bulb temperature 35°C Wet-bulb temperature 24°C
Heating: Indoor Dry-bulb temperature 20°C Wet-bulb temperature -

Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C
1 Measured under rated operating frequency.

Specifications and rated conditions of main electric parts

Model

Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 V DC
Varistor

(NR11)

470 V

Terminal block (TB) 3P

OBH822

5

NOISE CRITERIA CURVES

4

MSZ-HR25VF

MSZ-HR35VF

MSZ-HR42VF MSZ-HR50VF

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

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

45

HEATING

46

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

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

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

45

HEATING

47

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

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

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

43

HEATING

43

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

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

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

46

HEATING

44

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

Test conditions

Cooling: Dry-bulb temperature 27°C

Wet-bulb temperature 19°C

Heating: Dry-bulb temperature 20°C

Wet-bulb temperature -°C

INDOOR UNIT

WALL

MICROPHONE

0.8m

1m

OBH822

6

OUTLINES AND DIMENSIONS

5

MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF

Unit: mm

OBH822

7

MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF

WIRING DIAGRAM

6

OBH822

8

REFRIGERANT SYSTEM DIAGRAM

7

Unit: mm

MSZ-HR25VF

MSZ-HR35VF

Indoor
heat
exchanger

Flared connection

Room temperature
thermistor
RT 11

Flared connection

Refrigerant flow in cooling

Refrigerant pipe ø9.52
(with heat insulator)

Refrigerant pipe ø6.35
(with heat insulator)

Indoor coil
thermistor
RT12

Indoor coil
thermistor
RT13

Indoor
heat
exchanger

Flared connection

Room temperature
thermistor
RT 11

Flared connection

Refrigerant flow in cooling

Refrigerant pipe ø9.52
(with heat insulator)

Refrigerant pipe ø6.35
(with heat insulator)

Indoor coil
thermistor
RT12

Indoor coil
thermistor
RT13

OBH822

9

Unit: mm

MSZ-HR42VF MSZ-HR50VF

Indoor
heat
exchanger

Flared connection

Room temperature
thermistor
RT 11

Flared connection

Refrigerant flow in cooling

Refrigerant pipe ø9.52
(with heat insulator)

Refrigerant pipe ø6.35
(with heat insulator)

Indoor coil
thermistor
RT12

Indoor coil
thermistor
RT13

OBH822

10

MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF

8-1. TIMER SHORT MODE

For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.
board. (Refer to 10-7.)

•

The set time for the ON/OFF timer can be reduced to 1 second for each minute.

•

After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to 1
minute. Restarting the compressor, which takes 3 minutes, cannot be reduced.

SERVICE FUNCTIONS

8

Table 1

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

No. 1 unit No modication Same as at left Same as at left Same as at left

No. 2 unit — Solder J2 Same as at left Same as at left

No. 3 unit — — Solder J4 Same as at left

No. 4 unit — — — Solder both J2 and J4

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 been restored.

J2 J4

The P.C. board has the print “J2” and “J4”. Solder “J2” and “J4” 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
STOP/OPERATE/ (OFF/
ON) button 2 or 3 times at
first.

After finish modification,

put back the batteries then
press the RESET button.

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 :

OBH822

11

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 turned 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 the breaker from tripping 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

Indoor electronic
control P.C. board

CN 111

CN151

GND

CN112

OBH822