Mitsubishi Electric MSZ-FD VA Series 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 ························ 9
6. WIRING DIAGRAM·········································· 10
7. REFRIGERANT SYSTEM DIAGRAM ············· 13
8. PERFORMANCE CURVES ····························· 15
9. ACTUATOR CONTROL··································· 29
10. SERVICE FUNCTIONS···································· 30
11. TROUBLESHOOTING ····································· 31
12. DISASSEMBLY INSTRUCTIONS···················· 55
Models
SPLIT-TYPE AIR CONDITIONERS
MUZ-FD25VA - E1
MUZ-FD25VAH - E1 ,E2
MUZ-FD35VA - E1
MUZ-FD35VAH - E1
MUZ-FD50VA - E1
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH489
REVISED EDITION-B
OUTDOOR UNIT
Indoor unit service manual
MSZ-FD•VA Series (OBH488)
PARTS CATALOG (OBB489)
Revision B:
• MUZ-FD50VA- E1 has been added.
Please void OBH489 REVISED EDITION-A.
MUZ-FD25/35

2
Revision A:
• MUZ-FD25VAH- E2 has been added.
• Power outlet has been corrected.
Revision B:
• MUZ-FD50VA- E1 has been added.

3
TECHNICAL CHANGES
1
MUZ-FD25VA - E1
MUZ-FD25VAH - E1
MUZ-FD35VA - E1
MUZ-FD35VAH - E1
MUZ-FD50VA - E1
1. New model
MUZ-FD25VAH - E1 →MUZ-FD25VAH - E2
1. Power outlet E1 :12 A, E2 :10 A

4
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH
PART NAMES AND FUNCTIONS
2
Piping
Air outlet
Air inlet
(back and side)
Drain hose
Drain outlet
ACCESSORIES
MUZ-FD25/35VA MUZ-FD50VA
Drain socket 1 1
Drain cap - 2
MUZ-FD50VA

5
Outdoor model MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min.-Max.)
Cooling kW 2.5 (1.1-3.5) 3.5 (1.1-4.0) 3.5 (0.8-4.0)
Heating 3.2 (1.5-5.5) 3.2 (1.5-6.3) 4.0 (1.5-6.3) 4.0 (1.3-7.7)
Breaker Capacity A 10 E1 : 12
E2 : 10 10 12
Electrical data
Power input 1 (Total) Cooling W485 850 835
Heating 610 865 850
Running current 1 (Total) Cooling A2.4 3.9 3.8
Heating 2.9 4.0 3.9
Power factor 1 (Total) Cooling %88 95 96
Heating 91 94 95
Starting current 1 (Total) A 2.9 4.0 3.9
Coefficient of performance
(COP) 1 (Total)
Cooling 5.15 4.12 4.19
Heating 5.25 4.62 4.71
Compressor
Model SNB130FGBH
Output W 900
Current 1 Cooling A1.88 3.31 3.21
Heating 2.30 3.33 3.23
Refrigeration oil (Model) cc 450 (NEO22)
Fan motor
Model RC0J50-EA
Current 1Cooling A0.27 0.32
Heating 0.30 0.35
Dimensions W × H × D mm 800 × 550 × 285
Weight kg 36
Special remarks
Dehumidification Cooling /h 1.4 2.0
Air flow 1
Cooling High
m3/h
1,872
Low 1,086
Heating
High 2,016
Med. 1,776
Low 1,386
Sound level 1 Cooling dB(A) 46 47
Heating 50
Fan speed
Cooling High
rpm
810
Low 490
Heating
High 870
Med. 770
Low 610
Fan speed regulator 3
Refrigerant filling capacity (R410A) kg 1.15
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.
SPECIFICATION
3

6
Outdoor model MUZ-FD50VA
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min.-Max.)
Cooling kW 5.0 (1.5-5.8)
Heating 5.8 (1.5-7.8)
Breaker Capacity A 16
Electrical data
Power input 1 (Total) Cooling W1,500
Heating 1,550
Running current 1 (Total) Cooling A6.7
Heating 6.9
Power factor 1 (Total) Cooling %98
Heating 98
Starting current 1 (Total) A 6.9
Coefficient of performance
(COP) 1 (Total)
Cooling 3.33
Heating 3.74
Compressor
Model SNB172FDGH
Output W 1,200
Current 1Cooling A5.40
Heating 5.62
Refrigeration oil (Model) cc 450 (NEO22)
Fan motor
Model RC0J60-AA
Current 1 Cooling A 0.72
Heating
Dimensions W × H × D mm 840 × 850 × 330
Weight kg 55
Special remarks
Dehumidification Cooling /h 1.7
Air flow 1
Cooling
High
m3/h
–
Med. 2,940
Low 1,680
Heating
High 2,940
Med. 2,940
Low 2,100
Sound level 1 Cooling dB(A) 54
Heating 56
Fan speed
Cooling
High
rpm
–
Med. 800
Low 480
Heating
High 800
Med. 800
Low 580
Fan speed regulator 2
Refrigerant filling capacity (R410A) kg 1.55
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.

7
Specifications and rating conditions of main electric parts
Model
Item MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH
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 — 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 — 3 A 250 V
R.V.coil (21S4) AC 220 - 240 V
Heater protector (26H) — Open 45°C — Open 45°C
IGBT (TR821) 30 A 600 V
Model
Item MUZ-FD50VA
Current transformer (CT1, CT2) 20 A
(CT61) 20 A
Smoothing capacitor (CB1, CB2, CB3) 560 F 450 V
Fuse (F64) T2.0AL250V
(F801) T3.15AL250V
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-limiting PTC thermistor (PTC64, PTC65) 33 
Current-detecting resistor (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
R.V. coil (21S4) AC 220 - 240 V

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, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING 46
NC-10
MUZ-FD25VA MUZ-FD25VAH
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-FD35VA MUZ-FD35VAH
NOISE CRITERIA CURVES
4
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-FD50VA

9
Unit: mm
MUZ-FD25VA MUZ-FD25VAH MUZ-FD35VA MUZ-FD35VAH
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 ø42 (25/35VA)
Drain hole ø33 (25/35VAH)
OUTLINES AND DIMENSIONS
5
30°
35°
155
90
198
40
515
299
66
34
51
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
Drain holes ø33
MUZ-FD50VA

10
MUZ-FD25VA MUZ-FD35VA
WIRING DIAGRAM
6