Mitsubishi Electric MSZ-SF25VE-E1 User manual

Models
MSZ-SF25VE -E1 , E2 , EN1 , EN2 , ER2
MSZ-SF35VE -E1 , E2 , EN1 , EN2 , ER2
MSZ-SF42VE -E1 , E2 , EN1 , EN2 , ER2
MSZ-SF50VE -E1 , E2 , EN1 , EN2 , ER2
MSZ-SF25VE2 -E1 , EN1 , ER1
MSZ-SF35VE2 -E1 , EN1 , ER1
MSZ-SF42VE2 -E1 , EN1 , ER1
MSZ-SF50VE2 -E1 , EN1 , ER1
MSZ-SF25VE3 -E1 , EN1 , ER1
MSZ-SF35VE3 -E1 , EN1 , ER1
MSZ-SF42VE3 -E1 , EN1 , ER1
MSZ-SF50VE3 -E1 , EN1 , ER1
SERVICE MANUAL
INDOOR UNIT
PARTS CATALOG (OBB600)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision E:
• MSZ-SF25/35/42/50VE3- E1 , EN1, ER1 have
been added.
Please void OBH600 REVISED EDITION-D.
Revision E:
• MSZ-SF25/35/42/50VE3- E1 , EN1, ER1 have
been added.
Please void OBH600 REVISED EDITION-D.
No. OBH600
REVISED EDITION-E
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 5
3. SPECIFICATION················································ 7
4. NOISE CRITERIA CURVES···························· 10
5. OUTLINES AND DIMENSIONS ·······················11
6. WIRING DIAGRAM·········································· 12
7. REFRIGERANT SYSTEM DIAGRAM············· 16
8. SERVICE FUNCTIONS ··································· 17
9. MICROPROCESSOR CONTROL ··················· 19
10. TROUBLESHOOTING····································· 27
11. DISASSEMBLY INSTRUCTIONS···················· 40
Outdoor unit service manual
MUZ-SF·VE(H) Series (OBH629)
MXZ-C·VA Series (OB584)
MXZ-D·VA Series (OBH626)
MXZ-8B Series (OCH480)
MXZ-E·VA Series (OBH723)

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 specified 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.
Revision B:
• "How to check miswiring and serial signal error" for MUZ type has been added.
• The description about "Low standby power control" has been added to "TECHNICAL CHANGES".
Revision C:
• MSZ-SF25/35/42/50VE- ER2 have been added.
Revision D:
• MSZ-SF25/35/42/50VE2- E1 , EN1, ER1 have been added.
Revision E:
• MSZ-SF25/35/42/50VE3- E1 , EN1, ER1 have been added.
OBH600E

3
TECHNICAL CHANGES
1
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- E1 MSZ-SF25VE- E2 MSZ-SF25VE-EN1 MSZ-SF25VE-EN2
MSZ-SF35VE- E1 MSZ-SF35VE- E2 MSZ-SF35VE-EN1 MSZ-SF35VE-EN2
MSZ-SF42VE- E1 MSZ-SF42VE- E2 MSZ-SF42VE-EN1 MSZ-SF42VE-EN2
MSZ-SF50VE- E1 MSZ-SF50VE- E2 MSZ-SF50VE-EN1 MSZ-SF50VE-EN2
1. Indoor electronic control P.C. board has been changed.
E2 and EN2 models are compatible with the outdoor units with low standby power control.
Connecting these models to the MUZ-SF·VE(H)-series outdoor units enables the low standby power control. Refer to the tech-
nical guide (OBT17) about the low standby power control.
These models may be connected to the MUZ-SF·VE(H) series after once connected to the MXZ series and operated, for
example because of relocation. In that case, the MUZ-SF·VE(H) series outdoor units will not operate without taking a step.
Follow the procedure "Deleting the memorized abnormal condition" described in 10-2.1.
MSZ-SF25VE-ER2
MSZ-SF35VE-ER2
MSZ-SF42VE-ER2
MSZ-SF50VE-ER2
1. New model
MSZ-SF25VE2- E1
MSZ-SF35VE2- E1
MSZ-SF42VE2- E1
MSZ-SF50VE2- E1
1. New model
MSZ-SF25VE2-EN1
MSZ-SF35VE2-EN1
MSZ-SF42VE2-EN1
MSZ-SF50VE2-EN1
1. New model
MSZ-SF25VE2-ER1
MSZ-SF35VE2-ER1
MSZ-SF42VE2-ER1
MSZ-SF50VE2-ER1
1. New model
OBH600E

4
MSZ-SF25VE3- E1
MSZ-SF35VE3- E1
MSZ-SF42VE3- E1
MSZ-SF50VE3- E1
1. New model
MSZ-SF25VE3-EN1
MSZ-SF35VE3-EN1
MSZ-SF42VE3-EN1
MSZ-SF50VE3-EN1
1. New model
MSZ-SF25VE3-ER1
MSZ-SF35VE3-ER1
MSZ-SF42VE3-ER1
MSZ-SF50VE3-ER1
1. New model
OBH600E

5
ACCESSORIES
MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE
MSZ-SF25VE2 MSZ-SF35VE2 MSZ-SF42VE2 MSZ-SF50VE2
PART NAMES AND FUNCTIONS
2
Model MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE
MSZ-SF25VE2 MSZ-SF35VE2 MSZ-SF42VE2 MSZ-SF50VE2
Installation plate 1
Installation plate fixing 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 ¿lter
(Nano platinum ¿lter)
Air cleaning ¿lter
(Electrostatic anti-allergy
enzyme ¿lter, option)
Heat exchanger
Front panel
Air outlet
Remote controller
OBH600E

6
ACCESSORIES
MSZ-SF25VE3 MSZ-SF35VE3 MSZ-SF42VE3 MSZ-SF50VE3
Model MSZ-SF25VE3 MSZ-SF35VE3 MSZ-SF42VE3 MSZ-SF50VE3
Installation plate 1
Installation plate fixing 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 ¿lter
(Air purifying ¿lter)
Air cleaning ¿lter
(Silver-ionized air
puri¿er ¿lter, option)
Front panel
Air outlet
Heat exchanger
Spec name plate
Remote controller
OBH600E

7
Indoor model MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE
Power supply Single phase 230 V, 50 Hz
Electrical data
Power
input 1Cooling W18 22
Heating 24 27 35
Running
current 1Cooling A0.16 0.18
Heating 0.20 0.22 0.27
Fan motor
Model RC0J21-AA
Current
1Cooling A0.16 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
Airflow
Cooling
Super High
m3/h
546 594
High 432 474 492
Med. 336 402 420
Low 246 348 372
Silent 210 300 336
Heating
Super High
m3/h
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 40 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
3
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) 3P
OBH600E

8
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) 3P
Indoor model MSZ-SF25VE2 MSZ-SF35VE2 MSZ-SF42VE2 MSZ-SF50VE2
Power supply Single phase 230 V, 50 Hz
Electrical data
Power
input 1Cooling W18 22
Heating 24 27 35
Running
current 1Cooling A0.16 0.18
Heating 0.20 0.22 0.27
Fan motor
Model RC0J21-AA
Current 1Cooling A0.16 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
Airflow
Cooling
Super High
m3/h
546 594
High 432 474 492
Med. 336 402 420
Low 246 348 372
Silent 192 (210 2) 282 (300 2) 306 (336 2)
Heating
Super High
m3/h
618 660 684 720
High 492 498 546 588
Med. 402 432 480
Low 246 348 384
Silent 180 (210 2) 282 (300 2) 306 (336 2)
Sound level
Cooling
Super High
dB(A)
42 45
High 36 38 40
Med. 30 34 36
Low 24 31 33
Silent 19 (21 2) 26 (28 2) 28 (30 2)
Heating
Super High
dB(A)
45 46 47 49
High 39 40 42 43
Med. 34 36 38
Low 24 31 33
Silent 19 (21 2) 26 (28 2) 28 (30 2)
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 550 (590 2) 720 (760 2) 770 (820 2)
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 530 (590 2) 720 (760 2) 770 (820 2)
Fan speed regulator 5
Remote controller model SG14D
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.
2 For multi system.
OBH600E

9
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) 3P
Indoor model MSZ-SF25VE3 MSZ-SF35VE3 MSZ-SF42VE3 MSZ-SF50VE3
Power supply Single phase 230 V, 50 Hz
Electrical data
Power
input 1Cooling W18 22
Heating 24 27 35
Running
current 1Cooling A0.16 0.18
Heating 0.20 0.22 0.27
Fan motor
Model RC0J21-AA
Current 1Cooling A0.16 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
Airflow
Cooling
Super High
m3/h
546 594
High 432 474 492
Med. 336 402 420
Low 246 348 372
Silent 192 (210 2) 282 (300 2) 306 (336 2)
Heating
Super High
m3/h
618 660 684 720
High 492 498 546 588
Med. 402 432 480
Low 246 348 384
Silent 180 (210 2) 282 (300 2) 306 (336 2)
Sound level
Cooling
Super High
dB(A)
42 45
High 36 38 40
Med. 30 34 36
Low 24 31 33
Silent 19 (21 2) 26 (28 2) 28 (30 2)
Heating
Super High
dB(A)
45 46 47 49
High 39 40 42 43
Med. 34 36 38
Low 24 31 33
Silent 19 (21 2) 26 (28 2) 28 (30 2)
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 550 (590 2) 720 (760 2) 770 (820 2)
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 530 (590 2) 720 (760 2) 770 (820 2)
Fan speed regulator 5
Remote controller model SG15D
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.
2 For multi system.
OBH600E

10
MSZ-SF25VE
MSZ-SF25VE2
MSZ-SF25VE3
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
46
NC-10
MSZ-SF35VE
MSZ-SF35VE2
MSZ-SF35VE3
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
45
NC-10
NOISE CRITERIA CURVES
4
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
1m
MSZ-SF42VE
MSZ-SF42VE2
MSZ-SF42VE3
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
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
45
49
NC-10
MSZ-SF50VE
MSZ-SF50VE2
MSZ-SF50VE3
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
47
NC-10
OBH600E

11
Unit: mm
MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE
MSZ-SF25VE2 MSZ-SF35VE2 MSZ-SF42VE2 MSZ-SF50VE2
MSZ-SF25VE3 MSZ-SF35VE3 MSZ-SF42VE3 MSZ-SF50VE3
225225
162.5 162.5
3.5
42
41
87.5 87.5
331.5 309.5
215.5
257
258
22235
236
67.5 89.5
58
92
47
108.5
100 7
()80
60
193
18
71
47
5195
5871
45
45
299
577 16061
798
778 10
216.5
Piping
Insulation Ø37 O.D
Liquid line Ø6.35 - 0.39m (Flared connection Ø6.35)
Gas line Ø9.52 - 0.34m [Flared connection Ø9.52 (MSZ-SF25/35/42VE(2/3)), Ø12.7 (MSZ-SF50VE(2/3))]
Drain hose Insulation Ø28 Connected part Ø16 O.D
Piping
Insulation Ø37 O.D
Liquid line Ø6.35 - 0.5m (Flared connection Ø6.35)
Gas line Ø9.52 - 0.43m [Flared connection Ø9.52 (MSZ-SF25/35/42VE(2/3)), Ø12.7 (MSZ-SF50VE(2/3))]
Drain hose Insulation Ø28 Connected part Ø16 O.D
(MSZ-SF25/35/42/50VE- E1 , E2 , ER2 )
(MSZ-SF25/35/42/50VE- EN1 , EN2 )
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole Ø65
Air inAir inAir inAir in
Installation plate
Piping
Drain hose
Air out
(MSZ-SF25/35/42/50VE2- EN1 )
(MSZ-SF25/35/42/50VE3- EN1 )
(MSZ-SF25/35/42/50VE2- E1 , ER1 )
(MSZ-SF25/35/42/50VE3- E1 , ER1 )
OUTLINES AND DIMENSIONS
5
OBH600E

12
MSZ-SF25VE- E1 , E2 , EN1 , EN2 MSZ-SF42VE- E1 , E2 , EN1 , EN2
WIRING DIAGRAM
6
MSZ-SF25VE- ER2 MSZ-SF42VE- ER2
OBH600E

13
MSZ-SF35VE- E1 , E2 , EN1 , EN2 MSZ-SF50VE- E1 , E2 , EN1 , EN2
MSZ-SF35VE- ER2 MSZ-SF50VE- ER2
OBH600E

14
MSZ-SF25VE2- E1 , EN1 , ER1 MSZ-SF42VE2- E1 , EN1 , ER1
MSZ-SF35VE2- E1 , EN1 , ER1 MSZ-SF50VE2- E1 , EN1 , ER1
OBH600E

15
MSZ-SF25VE3- E1 , EN1 , ER1 MSZ-SF42VE3- E1 , EN1 , ER1
MSZ-SF35VE3- E1 , EN1 , ER1 MSZ-SF50VE3- E1 , EN1 , ER1
OBH600E

16
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø9.52 (MSZ-SF25/35/42VE, MSZ-SF25/35/42VE2, MSZ-SF25/35/42VE3)
ø12.7 (MSZ-SF50VE, MSZ-SF50VE2, MSZ-SF50VE3)
(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-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE
MSZ-SF25VE2 MSZ-SF35VE2 MSZ-SF42VE2 MSZ-SF50VE2
MSZ-SF25VE3 MSZ-SF35VE3 MSZ-SF42VE3 MSZ-SF50VE3
OBH600E

17
8-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging JPG and JPS 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.
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION (MSZ-SF•VE)
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:
NOTE: For modification, take out the batteries and press the OPERATE/STOP (ON/OFF) (MSZ-SF·VE) button 2 or 3 times at
first.
After modification, put back the batteries then press the RESET button.
SERVICE FUNCTIONS
8
MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE
MSZ-SF25VE2 MSZ-SF35VE2 MSZ-SF42VE2 MSZ-SF50VE2
MSZ-SF25VE3 MSZ-SF35VE3 MSZ-SF42VE3 MSZ-SF50VE3
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.
J1 J2
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modification 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.
OBH600E

18
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
IC171
CN104CN112
BZ
Indoor electronic
control P.C. board
8-3. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT
(MSZ-SF•VE2, MSZ-SF•VE3)
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.
OBH600E

19
WIRELESS REMOTE CONTROLLER
MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE
MSZ-SF25VE2 MSZ-SF35VE2 MSZ-SF42VE2 MSZ-SF50VE2
MSZ-SF25VE3 MSZ-SF35VE3 MSZ-SF42VE3 MSZ-SF50VE3
MICROPROCESSOR CONTROL
9
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives 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
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
CLOCK SET button
WEEKLY TIMER
set button
TIME, TIMER set buttons
FORWARD button
BACKWARD button
RESET button
i save button
VANE CONTROL button
Signal transmitting section
Operation display section
TEMPERATURE buttons
OPERATE/STOP
(ON/OFF) button
Indication of
remote controller
model is on back
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
CLOCK SET button
WEEKLY TIMER
set button
TIME, TIMER set buttons
FORWARD button
BACKWARD button
RESET button
i save button
VANE CONTROL button
MSZ-SF25VE MSZ-SF35VE MSZ-SF42VE MSZ-SF50VE
MSZ-SF25VE2 MSZ-SF35VE2 MSZ-SF42VE2 MSZ-SF50VE2
OBH600E

20
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
The unit is operating to
reach the set temperature About 2°C or more away from set temperature
The room temperature is approaching the set tem-
perature About 1 to 2°C away from
set temperature
Standby mode (Only during multi system
operation)
-
INDOOR UNIT DISPLAY SECTION
Lighted
Blinking
Not lighted
9-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF)/(MSZ-SF·VE, MSZ-SF·VE2)/ STOP/OPERATE (OFF/ON) (MSZ-SF·VE3) 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.
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
Signal transmitting section
Operation display section
TEMPERATURE buttons
STOP/OPERATE
(OFF/ON) button
Indication of
remote controller
model is on back
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
CLOCK SET button
WEEKLY TIMER
set button
TIME, TIMER set buttons
FORWARD button
BACKWARD button
RESET button
i save button
VANE CONTROL button
MSZ-SF25VE3 MSZ-SF35VE3 MSZ-SF42VE3 MSZ-SF50VE3
OBH600E