Mitsubishi Electric MUZ-HJ25VA-E2 User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS··················4
3. SPECIFICATION ········································5
4. NOISE CRITERIA CURVES··························8
5. OUTLINES AND DIMENSIONS···················10
6. WIRING DIAGRAM···································12
7. REFRIGERANT SYSTEM DIAGRAM···········16
8. PERFORMANCE CURVES ························18
9. ACTUATOR CONTROL·····························34
10. SERVICE FUNCTIONS······························35
11. TROUBLESHOOTING·······························36
12. DISASSEMBLY INSTRUCTIONS·················56
Models
MUZ-HJ25VA -E1 , E2 , ER1 , ER2 , ET1 , ET2
MUZ-HJ35VA -E1 , E3 , ER1 , ER3 , ET1 , ET2
MUZ-HJ50VA -E1 , E2 , ER1 , ER2 , ET1 , ET2
MUZ-HJ60VA -E1 , E2 , ER1 , ET1
MUZ-HJ71VA -E1 , E2 , ER1 , ET1
HFC
utilized
R410A
No. OBH648
REVISED EDITION-F
OUTDOOR UNIT
Indoor unit service manual
MSZ-HJ•VA Series (OBH647)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB648)
MUZ-HJ25VA
MUZ-HJ35VA
OBH648 REVISED EDITION-E is void.
Revision F:
• "How to check miswiring and serial signal
error" has been corrected (11-5. M ).

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:
• MUZ-HJ50VA- E1 has been added.
Revision B:
• MUZ-HJ25VA- ER1 , MUZ-HJ35VA- ER1 and MUZ-HJ50VA- ER1 have been added.
Revision C:
• MUZ-HJ25VA- ET1 , MUZ-HJ35VA- ET1 and MUZ-HJ50VA- ET1 have been added.
Revision D:
• MUZ-HJ60VA- E1 , ER1 , ET1 and MUZ-HJ71VA- E1 , ER1 , ET1 have been added.
Revision E:
• MUZ-HJ25/50VA- E2 , ER2 , ET2 , MUZ-HJ35VA- E3 , ER3 , ET2 and MUZ-HJ60/71VA- E2 have been added.
Revision F:
• "How to check miswiring and serial signal error" has been corrected (11-5. M ).
OBH648F

3
MUZ-HJ25VA - E1 , ER1
MUZ-HJ35VA - E1 , ER1
MUZ-HJ50VA - E1 , ER1
1. New model
MUZ-HJ25VA - ET1
MUZ-HJ35VA - ET1
MUZ-HJ50VA - ET1
1. New model
MUZ-HJ60VA - E1 , ER1 , ET1
MUZ-HJ71VA - E1 , ER1 , ET1
1. New model
MUZ-HJ25VA -E1 MUZ-HJ25VA -E2
MUZ-HJ35VA -E1 MUZ-HJ35VA -E3
MUZ-HJ50VA -E1 MUZ-HJ50VA -E2
MUZ-HJ60VA -E1 MUZ-HJ60VA -E2
MUZ-HJ71VA -E1 MUZ-HJ71VA -E2
1. Model name has been changed.
MUZ-HJ25VA - ER1 MUZ-HJ25VA - ER2
MUZ-HJ35VA - ER1 MUZ-HJ35VA - ER3
MUZ-HJ50VA - ER1 MUZ-HJ50VA - ER2
1. Model name has been changed.
MUZ-HJ25VA - ET1 MUZ-HJ25VA - ET2
MUZ-HJ35VA - ET1 MUZ-HJ35VA - ET2
MUZ-HJ50VA - ET1 MUZ-HJ50VA - ET2
1. Model name has been changed.
TECHNICAL CHANGES
1
OBH648F

4
2PART NAMES AND FUNCTIONS
ACCESSORIES
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(Back and side)
MUZ-HJ25VA MUZ-HJ35VA
Drain socket 1
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(Back and side)
MUZ-HJ50VA
MUZ-HJ60VA MUZ-HJ71VA
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
OBH648F

5
3SPECIFICATION
Outdoor model MUZ-HJ25VA MUZ-HJ35VA
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min.-Max.) Cooling kW 2.5 (1.3 - 3.0) 3.15 (1.4 - 3.5)
Heating 3.15 (0.9 - 3.5) 3.6 (1.1 - 4.1)
Breaker Capacity A 10
Electrical data
Power input 1 (Set) Cooling W730 1,040
Heating 870 995
Running current 1 (Set) Cooling A3.7 4.9
Heating 4.2 4.8
Power factor 1 (Set) Cooling %85 92
Heating 90
Starting current 1 (Set) A 4.2 4.9
Coefficient of performance
(COP) 1 (Set) Cooling 3.42 3.03
Heating 3.62
Compressor
Model KNB065FUJHC KNB073FUVHC
Output W 500 550
Current 1Cooling A3.3 4.4
Heating 3.8 4.4
Refrigeration oil (Model) L 0.32 (NEO22)
Fan motor Model RA6V21-BD
Current 1 A 0.23
Dimensions W × H × D mm 699 × 538 × 249
Weight kg 24 25
Special remarks
Dehumidification Cooling L/h 0.4 0.6
Air flow 1 m3/h 1,890
Sound level 1 Cooling dB(A) 50
Heating 50
Fan speed rpm 840
Fan speed regulator 1
Refrigerant filling capacity (R410A) kg 0.70 0.72
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
Refrigerant piping length (one way): 5 m
1 Measured under rated operating frequency.
OBH648F

6
Outdoor model MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min.-Max.) Cooling kW 5.0 (1.3 - 5.0) 6.1 (1.7-7.1) 7.1 (1.8-7.1)
Heating 5.4 (1.4 - 6.5) 6.8 (1.5-8.4) 8.1 (1.5-8.5)
Breaker Capacity A 12 16
Electrical data
Power input 1 (Set) Cooling W2,050 1,900 2,330
Heating 1,480 1,970 2,440
Running current 1 (Set) Cooling A9.0 8.4 10.3
Heating 6.6 8.7 10.8
Power factor 1 (Set) Cooling %99 98
Heating 97 98
Starting current 1 (Set) A 9.0 8.7 10.8
Coefficient of performance
(COP) 1 (Set) Cooling 2.44 3.21 3.05
Heating 3.65 3.45 3.32
Compressor
Model SNB130FGBHT SNB130FGBMT
Output W 900
Current 1Cooling A8.5 7.0 8.8
Heating 5.9 7.4 9.4
Refrigeration oil (Model) L 0.45 (NEO22) 0.35 (FV50S)
Fan motor Model RC0J50-FA RC0J77-AF
Current 1Cooling A0.27 0.94 0.97
Heating 0.34 0.94
Dimensions W × H × D mm 800 × 550 × 285 840 × 880 × 330
Weight kg 36 55
Special remarks
Dehumidification Cooling L/h 2.2 1.6 2.4
Air flow 1
Cooling High
m3/h
1,872 3,244
Med. 1,872 2,871 2,960
Low 1,086 1,566
Heating High 2,088 2,871 Med. 1,776 2,871
Low 1,386 2,331
Sound level 1Cooling dB(A) 50 55
Heating 51 55
Fan speed
Cooling High
rpm
810 950
Med. 810 840
Low 490 450
Heating High 900 810 Med. 770 810
Low 610 650
Fan speed regulator 3
Refrigerant filling capacity (R410A) kg 1.15 1.80
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
Refrigerant piping length (one way): 5 m
1 Measured under rated operating frequency.
OBH648F

7
Specifications and rated conditions of main electric parts
Model
Item MUZ-HJ25VA MUZ-HJ35VA
Smoothing capacitor (C61) 800 μF 420 V
Diode module (DB61) 15 A 600 V
(DB65) 10 A 600 V
Fuse (F701, F801) T3.15AL250V
Power module (IC700) 8 A 600 V 10 A 600 V
Expansion valve coil (LEV) 12 VDC
Reactor (L61) 18 mH
Switching power transistor (IC821) 30 A 600 V
Circuit protection (PTC64) 33 Ω
Terminal block (TB) 3 P
Relay (X61) 3 A 250 V (X63) 3 A 250 V
(X64) 20 A 250 V
R.V. coil (21S4) 220 - 240 VAC
Specifications and rated conditions of main electric parts
Model
Item MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA
Smoothing capacitor (C61, C62, C63) 600 μF/ 620 μF 420 V
Diode module (DB61) 15 A 600 V
Fuse (F61) T20AL250V
(F701, F801, F901) T3.15AL250V
Power module (IC700) 15 A 600 V (IC820) 20 A 600 V
(IC932) 8A600V
Expansion valve coil (LEV) 12 VDC
Reactor (L61) 23 mH
Circuit protection (PTC64, PTC65) 33 Ω
Terminal block (TB) 5 P
Relay (X63) 3 A 250 V
(X64) 20 A 250 V
R.V. coil (21S4) 220 - 240 VAC
OBH648F

8
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
HEATING
50
50
NC-10
MUZ-HJ25VA
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
HEATING
50
50
Test conditions
Cooling : Dry-bulb temperature 35°C
Heating : Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OUTDOOR UNIT
MICROPHONE
1m
NC-10
MUZ-HJ35VA
4NOISE CRITERIA CURVES
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
HEATING
50
NC-10
51
MUZ-HJ50VA
OBH648F

9
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
HEATING
55
NC-10
55
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
HEATING
55
NC-10
55
MUZ-HJ60VA MUZ-HJ71VA
Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OUTDOOR UNIT
MICROPHONE
1 m
OBH648F

10
Unit : mm
MUZ-HJ25VA MUZ-HJ35VA
5OUTLINES AND DIMENSIONS
REQUIRED SPACE
100 mm or more
350 mm or more
100 mm or more
*1 100 mm or more when front
and sides of the unit are clear
*2 When any 2 sides of left, right
and rear of the unit are clear
Clear *1
200 mm or
more *2
MUZ-HJ50VA
10
69
800
302.5
500 Bolt pitch for installation
150
22.3
Handle
550
280
164.5
99.5
170.5
23 Service panel
Service port
285
344.5
44
400
Air in
Air out
Air in
17.5
Bolt pitch for
installation
304~325
40
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø12.7
43°
35°
2 - 10 X 21 Oval hole
REQUIRED SPACE
350 mm or more
100 mm or more
Drain hole ø42
100 mm or more
*1 100 mm or more when front
and sides of the unit are clear
*2 When any 2 sides of left, right
and rear of the unit are clear
Clear *1
200 mm or
more *2
41.5
270.3
157.7
43°
40°
102.7
13.5
538
Air in
Air in
Air out
349.5
55.7
121.4
249
17.9
699
500121 259
Bolt pitch for
installation
294~267
285
19.6
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø9.52
Drain hole ø33
2 - 10.3 X 19.3 Oval hole
OBH648F