Mitsubishi MSZ-FH35VE, MSZ-FH35VE - E1, MSZ-FH25VE - ER1, MSZ-FH35VE - ER1, MSZ-FH50VE - ER1 Service Manual

CONTENTS

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

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

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

4. NOISE CRITERIA CURVE ································ 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 ····································· 20

11. DISASSEMBLY INSTRUCTIONS ···················· 36

SPLIT-TYPE AIR CONDITIONERS

SERVICE MANUAL

INDOOR UNIT

PARTS CATALOG (OBB623)

NOTE:

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

Outdoor unit service manual
MUZ-FH·VEHZ Series (OBH625)
MUZ-FH·VE Series
MXZ-D·VA Series

No. OBH623

REVISED EDITION-A

Models

MSZ-FH25VE

-

E1

MSZ-FH35VE

-

E1

MSZ-FH50VE

-

E1

Please void OBH623.

Revision A:

•

MSZ-FH50VE- E1 has been added.

Outdoor unit service manual
MUZ-FH·VEHZ Series (OBH625)
MUZ-FH·VE Series (OBH624)
MXZ-D·VA Series (OBH626)

2

<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.

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-FH50VE-

E1

has been added.

OBH623A

3

TECHNICAL CHANGES

1

MSZ-FH25VE -

E1

MSZ-FH35VE -

E1

MSZ-FH50VE -

E1

1. New model

These models are compatible with the outdoor units with low standby power control.

Connecting these models to the MUZ-FH·VE(HZ)-series outdoor units enables the low standby power control. Refer to the
technical guide (OBT17) about the low standby power control.

These models may be connected to the MUZ-FH·VE(HZ) series after once connected to the MXZ series and operated, for
example because of relocation. In that case, the MUZ-FH·VE(HZ) series outdoor units will not operate without taking a step.
Follow the procedure "Deleting the memorized abnormal condition" described in 10-2.1.

OBH623A

4

ACCESSORIES

MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE

PART NAMES AND FUNCTIONS

2

Model

MSZ-FH25VE
MSZ-FH35VE
MSZ-FH50VE

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
Air cleaning fi lter

(Electrostatic anti-allergy enzyme fi lter)

1

Air cleaning fi lter (Deodorizing fi lter) 1
Air purifying device 1

Operation indicator lamp

Remote control receiving
section

Emergency
operation
switch

Horizontal
vane

Air inlet

Air filter

Air cleaning filter
(Electrostatic anti-allergy
enzyme filter and deodorizing filter)

Front panel

Air outlet

Air purifying device

i-see SENSOR

(AIR PURIFYING)
(POWER)

Remote controller

OBH623A

5

Indoor model MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE

Power supply Single phase 230 V, 50 Hz

Electrical

data

Power input 1

Cooling

W

29 31

Heating 29 31

Running current

1

Cooling

A

0.28 0.29

Heating 0.28 0.29

Fan

motor

Model RC0J30-MD
Current 1

Cooling

A

0.28 0.29

Heating 0.28 0.29
Dimensions W × H × D mm 925 × 305(+17) × 234
Weight kg 13.5

Special remarks

Air direction 5

Airfl ow

Cooling

Super High

m

3

/h

696 744
High 516 606
Med. 378 516
Low 282 444
Silent 234 384

Heating

Super High

m

3

/h

792 876
High 552 672
Med. 384 540
Low 282 432
Silent 240 342

Sound level

Cooling

Super High

dB(A)

42 44
High 36 39
Med. 29 35
Low 23 24 31
Silent 20 21 27

Heating

Super High

dB(A)

44 46
High 36 39
Med. 29 34
Low 24 29
Silent 20 21 25

Fan speed

Cooling

Super High

rpm

1,220 1,280
High 970 1,090
Med. 770 970
Low 630 870
Silent 550 780

Heating

Super High

rpm

1,350 1,460
High 1,020 1,180
Med. 780 1,000
Low 630 850
Silent 560 720

Fan speed regulator 5

Remote controller model SG13A

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

SPECIFICATION

3

Specifications and rating conditions of main electric parts

Fuse (F11)

T3.15AL250V
Horizontal vane motor (MV1) 12 VDC
Vertical vane motor (MV2) 12 VDC
i-see SENSOR MOTOR (MT) 12 VDC
Varistor (NR11) S10K300E2K1
Terminal block (TB)

3P

OBH623A

6

MSZ-FH25VE MSZ-FH35VE

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

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

42
44

NC-10

NOISE CRITERIA CURVE

4

Test conditions

Cooling: Dry-bulb temperature 27 °C

Wet-bulb temperature 19 °C

Heating: Dry-bulb temperature 20 °C

INDOOR UNIT

WALL

MICROPHONE

0.8m

1m

MSZ-FH50VE

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

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

44
46

NC-10

OBH623A

7

Unit: mm

MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE

MSZ-FH25VE MSZ-FH35VE

Piping

Insulation ø37 O.D
Liquid line ø6.35 - 0.39 m (Flared connection ø6.35)
Gas line ø9.52 - 0.34 m (Flared connection ø9.52)

Drain hose Insulation ø28 O.D Connected part ø16 O.D

OUTLINES AND DIMENSIONS

5

MSZ-FH50VE

Piping

Insulation ø37 O.D
Liquid line ø6.35 - 0.39 m (Flared connection ø6.35)
Gas line ø9.52 - 0.34 m (Flared connection ø12.7)

Drain hose Insulation ø28 O.D Connected part ø16 O.D

OBH623A

8

MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE

WIRING DIAGRAM

6

OBH623A

9

Indoor
heat
exchanger

Flared connection

Room temperature
thermistor
RT11

Flared connection

Refrigerant pipe ø9.52
(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

7

MSZ-FH25VE MSZ-FH35VE

Indoor
heat
exchanger

Flared connection

Room temperature
thermistor
RT11

Flared connection

Refrigerant pipe ø12.7
(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

MSZ-FH50VE

OBH623A

10

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. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT

A maximum of 4 indoor units with wireless remote controllers can be used in a room.
To operate the indoor units individually with each remote controller, assign a number to each remote controller according
to the number of the indoor unit.

This setting can be set only when all the following conditions are met:

• The remote controller is powered OFF.

• Weekly timer is not set.

• Weekly timer is not being edited.
(1) Hold down

button on the remote controller for 2 seconds to enter the pairing mode.

(2) Press

button again and assign a number to each remote controller.

Each press of

button advances the number in the following order: 1 → 2 → 3 → 4.

(3) Press

button to complete the pairing setting.

After you turn the breaker ON, the remote controller that first sends a signal to an indoor unit will be regarded as the
remote controller for the indoor unit.
Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.

SERVICE FUNCTIONS

8

MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE

8-3. SETTING THE INSTALLATION POSITION

Be sure to set the remote controller according to the installed position of the indoor unit.

Installation position:

Left: Distance to objects (wall, cabinet, etc.) is less than 50 cm to the left
Center: Distance to objects (wall, cabinet, etc.) is more than 50 cm to the left and right
Right: Distance to objects (wall, cabinet, etc.) is less than 50 cm to the right

The installation position can be set only when all the following conditions are met:

• The remote controller is powered OFF.

• Weekly timer is not set.

• Weekly timer is not being edited.

(1) Hold down

button on the remote controller for 2 seconds to enter the position setting mode.

(2) Select the target installation position by pressing

button. (Each press of the button displays the

positions in order: center → right → left.)
(3) Press

button to complete the position setting.

Installation position Left Center Right
Remote controller

display

(Left)(Center)(Right)

OBH623A

11

8-4. 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

CN110CN151

BZ

Indoor electronic control
P.C. board

OBH623A

12

WIRELESS REMOTE CONTROLLER

MSZ-FH25VE MSZ-FH35VE MSZ-FH50VE

MICROPROCESSOR CONTROL

9

NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receive the signal of the

remote controller with beeps.

Signal transmitting section

Operation display section

Temperature buttons

OPERATE/STOP
(ON/OFF) button

Indication of
remote controller
model is on back

Distance of signal :
About 6 m

Beep(s) is (are) heard from
the indoor unit when the
signal is received.

FAN SPEED CONTROL button

PURIFIER button
INDIRECT/DIRECT button

OPERATION SELECT button

ECONO COOL button
POWERFUL button

CLOCK button

Lid
Slide the lid down
to open the remote
controller. Slide it down
further to get to the
weekly timer buttons.

WEEKLY TIMER
set buttons

TIME, TIMER set buttons
FORWARD button
BACKWARD button

RESET button

i-save button

NATURAL FLOW button

SENSOR (i-see) button

VANE CONTROL button

WIDE VANE button

INDOOR UNIT DISPLAY SECTION

Operation Indicator lamp

The operation indicator at the right side of the indoor unit indicates the operation state.

•The following indication applies regardless of shape of the indication.
Indication Operation state Room temperature

Standby mode
(Only during multi system
operation)

-

Lighted
Blinking

Not lighted

9-1. COOL ( ) OPERATION

(1) Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons TEMP

or button to select the desired temperature. The setting range is 16 - 31°C.

1. Coil frost prevention

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil

from frosting.

When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.

The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor

heat exchanger rises.

2. Low outside temperature operation

When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.

3. Indoor fan speed control

When the thermostat turns OFF, the indoor fan operates very Low to reduce power consumption.
When the room temperature rises and the thermostat is ON, the indoor fan operates according to the settings on the

remote controller.

OBH623A