Mitsubishi Electric MUZ-HA VF Series User manual

Models
MSZ-HR25VF -E1 , ER1 , ET1 , E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-HR35VF -E1 , ER1 , ET1 , E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-HR42VF -E1 , ER1 , ET1 , E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-HR50VF -E1 , ER1 , ET1 , E2 , ER2 , ET2 , E3 , ER3 , ET3
MSZ-HR60VF -E1 , ER1 , ET1 , E2 , ER2 , ET2 , E3
MSZ-HR71VF -E1 , ER1 , ET1 , E2 , ER2 , ET2 , E3
MSZ-HR25VFK -E1 , ER1 , ET1 , E2 , ER2 , ET2
MSZ-HR35VFK -E1 , ER1 , ET1 , E2 , ER2 , ET2
MSZ-HR42VFK -E1 , ER1 , ET1 , E2 , ER2 , ET2
MSZ-HR50VFK -E1 , ER1 , ET1 , E2 , ER2 , ET2
MSZ-HR60VFK -E1 , ER1 , ET1
MSZ-HR71VFK -E1 , ER1 , ET1
INDOOR UNIT
Outdoor unit service manual
MUZ-HR∙VF Series (OBH823)
MXZ-HA∙VF Series (OBH828)
PARTS CATALOG (OBB822)
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················4
3. SPECIFICATION ········································5
4. NOISE CRITERIA CURVES··························7
5. OUTLINES AND DIMENSIONS ·····················9
6. WIRING DIAGRAM ··································· 11
7. REFRIGERANT SYSTEM DIAGRAM ··········· 18
8. SERVICE FUNCTIONS······························ 19
9. MICROPROCESSOR CONTROL················· 22
10. TROUBLESHOOTING ······························· 26
11. DISASSEMBLY INSTRUCTIONS ················· 45
SERVICE MANUAL
MSZ-HR25VF
OBH822 REVISED EDITION-G is void.
Revision H:
• MSZ-HR25/35/42/50VFK- E2 , ER2 , ET2
and MSZ-HR25/35/42/50VF- E3 , ER3 , ET3
have been added.
No. OBH822
REVISED EDITION-H

2
Revision A:
• MSZ-HR60/71VF- E1 , ET1 have been added.
Revision B:
• MSZ-HR60/71VF - ER1 have been added.
Revision C:
• 10. TROUBLESHOOTING has been modied.
Revision D:
• MSZ-HR60/71VF- E2 have been added.
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.
<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 pull 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.
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap
between the valve stem and the valve body, resulting in injuries.
Revision E:
• MSZ-HR25/35/42/50/60/71VFK- E1 , ET1 , MSZ-HR25/35/42/50VFK - ER1 , MSZ-HR25/35/42/50VF- E2 , ER2 , ET2 and
MSZ-HR60/71VF- ET2 , E3 have been added.
Revision F:
• MSZ-HR60/71VFK - ER1 and MSZ-HR60/71VF - ER2 have been added.
Revision G:
• Print of the remote controller P.C. board has been added. (The remote controller P.C. boards are compatible.)
• Some descriptions have been modied.
Revision H:
• MSZ-HR25/35/42/50VFK- E2 , ER2 , ET2 and MSZ-HR25/35/42/50VF- E3 , ER3 , ET3 have been added.
OBH822H

3
TECHNICAL CHANGES1
MSZ-HR25VF - E1 , ER1 , ET1
MSZ-HR35VF - E1 , ER1 , ET1
MSZ-HR42VF - E1 , ER1 , ET1
MSZ-HR50VF - E1 , ER1 , ET1
MSZ-HR60VF - E1 , ER1 , ET1
MSZ-HR71VF - E1 , ER1 , ET1
1. New model
MSZ-HR60VF - E1 MSZ-HR60VF - E2
MSZ-HR71VF - E1 MSZ-HR60VF - E2
1. Model name has been changed.
MSZ-HR25VF - E1 , ER1 , ET1 MSZ-HR25VF - E2 , ER2 , ET2
MSZ-HR35VF - E1 , ER1 , ET1 MSZ-HR35VF - E2 , ER2 , ET2
MSZ-HR42VF - E1 , ER1 , ET1 MSZ-HR42VF - E2 , ER2 , ET2
MSZ-HR50VF - E1 , ER1 , ET1 MSZ-HR50VF - E2 , ER2 , ET2
1. Indoor control P.C. board has been changed.
MSZ-HR60VF - ET1 MSZ-HR60VF - ET2
MSZ-HR60VF - E2 MSZ-HR60VF - E3
MSZ-HR71VF - ET1 MSZ-HR60VF - ET2
MSZ-HR71VF - E2 MSZ-HR60VF - E3
1. Power P.C. board has been changed.
MSZ-HR25VFK - E1 , ER1 , ET1
MSZ-HR35VFK - E1 , ER1 , ET1
MSZ-HR42VFK - E1 , ER1 , ET1
MSZ-HR50VFK - E1 , ER1 , ET1
MSZ-HR60VFK - E1 , ET1
MSZ-HR71VFK - E1 , ET1
1. New model
MSZ-HR60VF - ER1 MSZ-HR60VF - ER2
MSZ-HR71VF - ER1 MSZ-HR71VF - ER2
1. Power P.C. board has been changed.
MSZ-HR60VFK - ER1
MSZ-HR71VFK - ER1
1. New model
MSZ-HR25VF - E2 , ER2 , ET2 MSZ-HR25VF - E3 , ER3 , ET3
MSZ-HR35VF - E2 , ER2 , ET2 MSZ-HR35VF - E3 , ER3 , ET3
MSZ-HR42VF - E2 , ER2 , ET2 MSZ-HR42VF - E3 , ER3 , ET3
MSZ-HR50VF - E2 , ER2 , ET2 MSZ-HR50VF - E3 , ER3 , ET3
MSZ-HR25VFK - E1 , ER1 , ET1 MSZ-HR25VFK - E2 , ER2 , ET2
MSZ-HR35VFK - E1 , ER1 , ET1 MSZ-HR35VFK - E2 , ER2 , ET2
MSZ-HR42VFK - E1 , ER1 , ET1 MSZ-HR42VFK - E2 , ER2 , ET2
MSZ-HR50VFK - E1 , ER1 , ET1 MSZ-HR50VFK - E2 , ER2 , ET2
1. Indoor control P.C. board has been changed.
2. Indoor fan motor has been changed.
OBH822H

4
PART NAMES AND FUNCTIONS2
MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF
MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK
ACCESSORIES
Model
MSZ-HR25VF MSZ-HR25VFK MSZ-HR35VF MSZ-HR35VFK
MSZ-HR42VF MSZ-HR42VFK MSZ-HR50VF MSZ-HR50VFK
MSZ-HR60VF MSZ-HR60VFK MSZ-HR71VF MSZ-HR71VFK
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
MSZ-HR60VF MSZ-HR71VF
MSZ-HR60VFK MSZ-HR71VFK
(Only for
MSZ-HR25/35/42/50VF- E2 , ER2 , ET2
MSZ-HR25/35/42/50VF- E3 , ER3 , ET3
MSZ-HR25/35/42/50VFK- E1 , ER1 , ET1
MSZ-HR25/35/42/50VFK- E2 , ER2 , ET2 )
(Other models)
(Only for MSZ-HR•VFK)
(Only for
MSZ-HR60/71VF- ER2 , ET2 , E3
MSZ-HR60/71VFK- E1 , ER1 , ET1 )
(Other models)
(Only for MSZ-HR•VFK)
OBH822H

5
SPECIFICATION3
Indoor model MSZ-HR25VF
MSZ-HR25VFK
MSZ-HR35VF
MSZ-HR35VFK
MSZ-HR42VF
MSZ-HR42VFK
MSZ-HR50VF
MSZ-HR50VFK
Power supply Single phase 230 V, 50 Hz
Electrical
data
Power input
*1
Cooling W20 28 32 39
Heating 20 28 32 39
Running
current *1
Cooling A0.20 0.27 0.30 0.36
Heating 0.20 0.27 0.30 0.36
Fan
motor
Model RC0J30-CV RC0J30-CV RC0J30-CV RC0J30-CV
Current *1 Cooling A0.20 0.27 0.30 0.36
Heating 0.20 0.27 0.30 0.36
Dimensions W × H × D mm 838 × 280 × 228 838 × 280 × 228 838 × 280 × 228 838 × 280 × 228
Weight kg 8.5 8.5 9.0 9.0
Special remarks
Air direction 5 5 5 5
Airow
Cooling
Super High
m3/h
582 702 786 786
High 432 468 648 672
Med. 324 336 522 522
Low 216 216 360 384
Heating
Super High 606 630 804 870
High 444 444 648 672
Med. 324 324 474 498
Low 198 198 336 366
Sound level
Cooling
Super High
dB(A)
43 46 45 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 37 40 41
Med. 30 30 32 34
Low 21 21 24 27
Fan speed
Cooling
Super High
rpm
1,120 1,280 1,130 1,130
High 900 950 970 1,000
Med. 730 750 830 860
Low 550 550 630 660
Heating
Super High 1,150 1,180 1,150 1,220
High 920 920 970 1,000
Med. 730 730 770 800
Low 520 520 600 640
Fan speed regulator 4 4 4 4
Remote controller model RH18A RH18A RH18A RH18A
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.
Specications and rated conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 V DC
Varistor
(NR11) 470 V
Terminal block (TB) 3P
OBH822H

6
Indoor model MSZ-HR60VF
MSZ-HR60VFK
MSZ-HR71VF
MSZ-HR71VFK
Power supply Single phase 230 V, 50 Hz Single phase 230 V, 50 Hz
Electrical
data
Power input *1 Cooling W55 55
Heating 55 55
Running current
*1
Cooling A0.50 0.50
Heating 0.50 0.50
Fan
motor
Model RC0J40-SA RC0J40-SA
Current *1 Cooling A0.50 0.50
Heating 0.50 0.50
Dimensions W × H × D mm 923 × 305 × 262 923 × 305 × 262
Weight kg 12.5 12.5
Special remarks
Air direction 5 5
Airow
Cooling
Super High
m3/h
1,176 1,176
High 924 924
Med. 756 756
Low 624 624
Heating
Super High
m3/h
1,176 1,176
High 1,002 1,002
Med. 786 786
Low 642 642
Sound level
Cooling
Super High
dB(A)
50 50
High 44 44
Med. 38 38
Low 33 33
Heating
Super High
dB(A)
50 50
High 44 44
Med. 38 38
Low 33 33
Fan speed
Cooling
Super High
rpm
1,220 1,220
High 1,000 1,000
Med. 850 850
Low 730 730
Heating
Super High
rpm
1,220 1,220
High 1,070 1,070
Med. 880 880
Low 750 750
Fan speed regulator 4 4
Remote controller model RH18A RH18A
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.
Specications and rated conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 V DC
Varistor
(NR11) 470V
Terminal block (TB) 3P
OBH822H

7
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
NOISE CRITERIA CURVES4
MSZ-HR25VF
MSZ-HR25VFK
MSZ-HR35VF
MSZ-HR35VFK
MSZ-HR42VF
MSZ-HR42VFK
MSZ-HR50VF
MSZ-HR50VFK
OBH822H

8
MSZ-HR60VF
MSZ-HR60VFK
MSZ-HR71VF
MSZ-HR71VFK
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
50
50
NC-10
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
50
50
NC-10
INDOOR UNIT
WALL
MICROPHONE
0.8m
1m
Test conditions
Cooling : Dry-bulb temperature 27°C Wet-bulb temperature 19°C
Heating : Dry-bulb temperature 20°C
OBH822H

9
OUTLINES AND DIMENSIONS5
Unit: mm
MSZ-HR25VF - E1 , ER1 , ET1 , E2 , ER2 , ET2 MSZ-HR35VF - E1 , ER1 , ET1 , E2 , ER2 , ET2
MSZ-HR42VF - E1 , ER1 , ET1 , E2 , ER2 , ET2 MSZ-HR50VF - E1 , ER1 , ET1 , E2 , ER2 , ET2
MSZ-HR25VFK - E1 , ER1 , ET1 MSZ-HR35VFK - E1 , ER1 , ET1
MSZ-HR42VFK - E1 , ER1 , ET1 MSZ-HR50VFK - E1 , ER1 , ET1
MSZ-HR25VF - E3 , ER3 , ET3 MSZ-HR35VF - E3 , ER3 , ET3
MSZ-HR42VF - E3 , ER3 , ET3 MSZ-HR50VF - E3 , ER3 , ET3
MSZ-HR25VFK - E2 , ER2 , ET2 MSZ-HR35VFK - E2 , ER2 , ET2
MSZ-HR42VFK - E2 , ER2 , ET2 MSZ-HR50VFK - E2 , ER2 , ET2
OBH822H

10
Unit: mm
403.5 38658
42 221.5
263
93 225 225 93
220.5
240.5 21.5
262
3
43
75.5
220 205
909
923
7
(5)
403.5
3.543
305
57
5262
65
63
65
53
63
93
71
18.5
65
56 19
132
65
709 161(53)
100
116.5
133
175.5
PIPING
INSULATION φ50 O.D
LIQUID LINE φ8 - 0.50m (FLARED CONNECTION φ6.35)
GAS LINE φ12 - 0.45m (FLARED CONNECTION φ12.7)
DRAIN HOSE INSULATION φ29 CONNECTED PART φ16 O.D
IN CASE OF LEFT, LEFT REAR,OR LEFT UNDER PIPING (USING SPACER), MIN 125.5mm
MIN 75mm
MIN 40mm
MIN 7mm MIN 89.5mm
DRAIN HOSE
PIPING
AIR OUT
AIR IN
26×11 OBLONG HOLE
11×20 OBLONG HOLE
INSTALLATION PLATE
INDOOR UNIT
WALL HOLE 75
INSTALLATION PLATE
MSZ-HR60VF MSZ-HR71VF
MSZ-HR60VFK MSZ-HR71VFK
OBH822H

11
WIRING DIAGRAM6
MSZ-HR25VF - E1 , ER1 , ET1 MSZ-HR35VF - E1 , ER1 , ET1 MSZ-HR42VF - E1 , ER1 , ET1
MSZ-HR50VF - E1 , ER1 , ET1
MSZ-HR25VF - E2 , ER2 MSZ-HR35VF - E2 , ER2 MSZ-HR42VF - E2 , ER2 MSZ-HR50VF - E2 , ER2
OBH822H

12
MSZ-HR25VF - E3 , ER3 MSZ-HR35VF - E3 , ER3 MSZ-HR42VF - E3 , ER3 MSZ-HR50VF - E3 , ER3
MSZ-HR25VF - ET2 MSZ-HR35VF - ET2 MSZ-HR42VF - ET2 MSZ-HR50VF - ET2
OBH822H

13
MSZ-HR25VF - ET3 MSZ-HR35VF - ET3 MSZ-HR42VF - ET3 MSZ-HR50VF - ET3
MSZ-HR25VFK - E1 , ER1 MSZ-HR35VFK - E1 , ER1 MSZ-HR42VFK - E1 , ER1
MSZ-HR50VFK - E1 , ER1
OBH822H

14
MSZ-HR25VFK - E2 , ER2 MSZ-HR35VFK - E2 , ER2 MSZ-HR42VFK - E2 , ER2
MSZ-HR50VFK - E2 , ER2
MSZ-HR25VFK - ET1 MSZ-HR35VFK - ET1 MSZ-HR42VFK - ET1 MSZ-HR50VFK - ET1
OBH822H

15
MSZ-HR60VF - E1 , ER1 , ET1 , E2 MSZ-HR71VF - E1 , ER1 , ET1 , E2
MSZ-HR25VFK - ET2 MSZ-HR35VFK - ET2 MSZ-HR42VFK - ET2 MSZ-HR50VFK - ET2
OBH822H

16
MSZ-HR60VF - ET2 MSZ-HR71VF - ET2
DI
Ş
ÜN
İTEYE
PARÇA ADI
SİGORTA
(T3.15AL250V)
FAN MOTORU
VARİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ(ANA)
TERMİNAL BLOĞU
BORU SICAKLIK
TERMİSTÖRÜ(YARDIMCI)
KANAT MOTORU
(YATAY)
REAKTÖR
İÇ ÜNİTE GÜÇ
KARTI
İÇ ÜNİTE
ELEKTRONİK
KONTROL
KARTI
Konektör
Terminal bloğu
NOTLAR:
1.
Dış ünite elektronik kablolaması
için dış ünite elektronik kablo devre
ş
emasını referans alınız.
2. Sadece bakır besleme
kablosu kullanın
3.
Sembolleri gösterir
MSZ-HR60VF - ER2 , E3 MSZ-HR71VF - ER2 , E3
OBH822H

17
MSZ-HR60VFK - ET1 MSZ-HR71VFK - ET1
MSZ-HR60VFK - E1 , ER1 MSZ-HR71VFK - E1 , ER1
DI
Ş
ÜN
İTEYE
PARÇA ADI
SİGORTA
(T3.15AL250V)
FAN MOTORU
VARİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ(ANA)
TERMİNAL BLOĞU
BORU SICAKLIK
TERMİSTÖRÜ(YARDIMCI)
KANAT MOTORU
(YATAY)
REAKTÖR
Wİ-Fİ
ARAYÜZÜ
İÇ ÜNİTE GÜÇ
KARTI
İÇ ÜNİTE
ELEKTRONİK
KONTROL
KARTI
Konektör
Terminal bloğu
NOTLAR:
1. Dış ünite elektronik kablolaması
için dış ünite elektronik kablo devre
şemasını referans alınız.
2. Sadece bakır besleme
kablosu kullanın
3.
Sembolleri gösterir
OBH822H

18
REFRIGERANT SYSTEM DIAGRAM7
Unit: mm
MSZ-HR25VF
MSZ-HR25VFK
MSZ-HR35VF
MSZ-HR35VFK
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
Indoor coil
thermistor
RT13
Refrigerant flow in cooling
Refrigerant flow in heating
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
Indoor coil
thermistor
RT13
Refrigerant flow in cooling
Refrigerant flow in heating
MSZ-HR42VF MSZ-HR50VF
MSZ-HR42VFK MSZ-HR50VFK
MSZ-HR60VF MSZ-HR71VF
MSZ-HR60VFK MSZ-HR71VFK
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
Indoor coil
thermistor
RT13
Refrigerant flow in cooling
Refrigerant flow in heating
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe ø12.7
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Indoor coil
thermistor
RT13
OBH822H

19
SERVICE FUNCTIONS8
MSZ-HR25VF MSZ-HR35VF MSZ-HR42VF MSZ-HR50VF MSZ-HR60VF MSZ-HR71VF
MSZ-HR25VFK MSZ-HR35VFK MSZ-HR42VFK MSZ-HR50VFK MSZ-HR60VFK MSZ-HR71VFK
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.
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/JP4 Same as at left
No. 4 unit — — — Solder both J2 and j4/JP4
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the rst 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.
The P.C. board has the print “J2” and “J4/JP4”. Solder “J2” and “J4/JP4” according to the number of indoor unit as shown in
Table 1.
After modication, press the RESET button.
NOTE : For modication, take out
the batteries and press the
STOP/OPERATE/ (OFF/
ON) button 2 or 3 times at
rst.
After nish modication,
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
modied according to the number of the indoor unit.
How to modify the remote controller P.C. board
1. Remove batteries before modication.
2. Check the print of the remote controller P.C. board
The board has a print as shown below :
J2 JP4
J2 J4
OBH822H

20
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 shuto󰀨 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 o󰀨 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
cancelled.
• 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 start-
ing current of all the compressors may ow 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
CN111 CN151
GND
CN112
Indoor electronic
control P.C. board
JR77
CN112
CN151
CN111
HR25/35/42/50 HR60/71
OBH822H