Mitsubishi Electric MUZ-FD25VABH - E1 User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 4
3. SPECIFICATION················································ 5
4. NOISE CRITERIA CURVES······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM············································ 9
7. REFRIGERANT SYSTEM DIAGRAM··············11
8. PERFORMANCE CURVES····························· 13
9. ACTUATOR CONTROL··································· 24
10. SERVICE FUNCTIONS···································· 25
11. TROUBLESHOOTING····································· 26
12. DISASSEMBLY INSTRUCTIONS···················· 53
Models
SPLIT-TYPE AIR CONDITIONERS
MUZ-FD25VABH - E1
MUZ-FD35VABH - E1
MUZ-FD50VABH - E1
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH519
OUTDOOR UNIT
Indoor unit service manual
MSZ-FD•VA Series (OBH488)
PARTS CATALOG (OBB519)
MUZ-FD25/35
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TECHNICAL CHANGES
1
MUZ-FD25VABH - E1
MUZ-FD35VABH - E1
MUZ-FD50VABH - E1
1. New model
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Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MUZ-FD25VABH MUZ-FD35VABH
MUZ-FD50VABH
Piping
Air outlet
Air inlet
(back and side)
Drain hose
PART NAMES AND FUNCTIONS
2
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SPECIFICATION
3
Outdoor model MUZ-FD25VABH MUZ-FD35VABH MUZ-FD50VABH
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min.-Max.)
Cooling kW 2.5 (1.1-3.5) 3.5 (0.8-4.0) 5.0 (1.5-5.8)
Heating 3.2 (1.5-6.3) 4.0 (1.3-6.6) 6.0 (1.5-8.2)
Breaker Capacity A 10 12 16
Electrical data
Power input 1 (Total) Cooling W485 835 1,510
Heating 600 840 1,610
Running current 1 (Total) Cooling A2.4 3.8 6.7
Heating 2.9 3.9 7.1
Power factor 1 (Total) Cooling %88 96 98
Heating 90 94 98
Starting current 1 (Total) A 2.9 3.9 7.1
Coefficient of performance
(C.O.P) 1 (Total)
Cooling 5.15 4.19 3.31
Heating 5.33 4.76 3.73
Compressor
Model SNB130FGBH SNB172FDGH
Output W 900 1,200
Current 1Cooling A1.88 3.21 5.45
Heating 2.30 3.23 5.89
Fan motor
Model RC0J50-EA RC0J60-AA
Current 1 Cooling A0.27 0.32 0.72
Heating 0.30 0.35
Dimensions W × H × D mm 800 × 550 × 285 840 × 850 × 330
Weight kg 36 55
Special remarks
Dehumidification Cooling /h 1.4 2.0 1.7
Air flow 1
Cooling
High
m3/h
1,872 –
Med. – 2,940
Low 1,086 1,680
Heating
High 2,016 2,940
Med. 1,776 2,940
Low 1,386 2,100
Sound level 1 Cooling dB(A) 46 47 54
Heating 50 56
Fan speed
Cooling
High
rpm
810 –
Med. – 800
Low 490 480
Heating
High 870 800
Med. 770 800
Low 610 580
Fan speed regulator 3 2
Refrigerant filling capacity (R410A) kg 1.15 1.55
Refrigeration oil (Model) NEO22
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.
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Specifications and rating conditions of main electric parts
Model
Item MUZ-FD25VABH MUZ-FD35VABH
Current transformer (CT) 20 A
(CT761, CT781) 15 A
Smoothing capacitor (C61, C62, C63) 620 F 420 V
Diode module (DB61) 15 A 600 V
(DB65) 25 A 600 V
Fuse (F61) T20AL250V
(F701, F801, F901) T3.15AL250V
Defrost heater (H) 230 V 130 W
Intelligent power module (IPM) 20 A 600 V
Expansion valve coil (LEV) DC 12 V
Reactor (L61) 23.0 mH
Current-detecting resistor
(R61, R62) 180 m5 W (2 elements)
(R825) 25 m5 W
(R937, R938, R939) 430 m2 W
Current-limiting PTC thermistor (PTC64, PTC65) 33 
Terminal block (TB1, TB2) 3 P
Relay
(X63) 3 A 250 V
(X64) 20 A 250 V
(X66) 3 A 250 V
R.V.coil (21S4) AC 220 - 240 V
Heater protector (26H) Open 45°C
IGBT (TR821) 30 A 600 V
Model
Item MUZ-FD50VABH
Current transformer (CT1, CT2) 20 A
(CT61) 20 A
Smoothing capacitor (CB1, CB2, CB3) 560 F 450 V
Fuse (F64) T2.0AL250V
(F71, F801) T3.15AL250V
Defrost heater (H) 230 V 130 W
Expansion valve coil (LEV) DC 12 V
Intelligent power module (IPM) 15 A 600 V
(HC930) 3 A 600 V
High pressure switch (HPS) ACB-DB156
Reactor (L) 600 H 20 A
Power factor correct module (PFC) 20 A 600 V
Current-detecting resistor (PTC64, PTC65) 33 
Current-limiting PTC thermistor (R937A, R937B) 1.1 2 W
(RS1, RS2, RS3, RS4) 40 m7 W (2 elements)
Solenoid coil relay (SSR61) 0.5 A 600 V
Terminal block (TB1, TB2) 3 P
Relay (X64) 20 A 250 V
(X71) 3A 250 V
R.V. coil (21S4) AC 220 - 240 V
Heater protector (26H) Open 45°C
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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, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING 46
NC-10
MUZ-FD25VABH
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
47
50
Test conditions
Cooling : Dry-bulb temperature 35 °C
Heating : Dry-bulb temperature 7 °C Wet-bulb temperature 6 °C
OUTDOOR UNIT
MICROPHONE
1 m
NC-10
MUZ-FD35VABH
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, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING
54
56
NC-10
MUZ-FD50VABH
NOISE CRITERIA CURVES
4
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MUZ-FD50VABH
Unit : mm
MUZ-FD25VABH MUZ-FD35VABH
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) ø9.52
43°
35°
2 holes 10 × 21
REQUIRED SPACE Basically open 100 mm or more
without any obstruction in front
and on both sides of the unit.
350 mm or more
200 mm or more
100 mm or more
100 mm or more
Open two sides of left,
right, or rear side.
Drain hole ø33
30°
35°
155
90
198
40
330
360
850
430
500 80
121
840
Service panel
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) ø12.7
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) ø6.35
170
Open as a rule
500 mm or more if
the front and both
sides are open
100 mm or more
200 mm or more if
there are obstacles
to both sides
Open as a rule
500 mm or more if the back,
both sides and top are open
350 mm or more
100 mm or more
REQUIRED SPACE
Air in
Air out
Air in
4 holes 10 × 21
OUTLINES AND DIMENSIONS
5
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WIRING DIAGRAM
6
MUZ-FD25VABH
MUZ-FD35VABH
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MUZ-FD50VABH
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