Mitsubishi Electric MUZ-FH25VEHZ User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
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···················· 48
Models
SPLIT-TYPE AIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH625
REVISED EDITION-A
OUTDOOR UNIT
Indoor unit service manual
MSZ-FH•VE Series (OBH623)
PARTS CATALOG (OBB625)
MUZ-FH25VEHZ -E1
MUZ-FH35VEHZ -E1
MUZ-FH50VEHZ -E1
Please void OBH625.
Revision A:
• MUZ-FH50VEHZ-
E1
has been added.
MUZ-FH25VEHZ
MUZ-FH35VEHZ

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-FH50VEHZ-
E1
has been added.
OBH625A

3
MUZ-FH25VEHZ - E1
MUZ-FH35VEHZ - E1
MUZ-FH50VEHZ - E1
1. New model
TECHNICAL CHANGES
1
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MUZ-FH25VEHZ
MUZ-FH35VEHZ
PART NAMES AND FUNCTIONS
2
MUZ-FH50VEHZ
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
OBH625A

4
Outdoor model MUZ-FH25VEHZ MUZ-FH35VEHZ
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min.-Max.)
Cooling kW 2.5 (0.8 - 3.5) 3.5 (0.8 - 4.0)
Heating 3.2 (1.0 - 6.3) 4.0 (1.0 - 6.6)
Breaker Capacity A 10 12
Electrical data
Power input 1 (Total) Cooling W485 820
Heating 580 800
Running current 1
(Total)
Cooling A2.6 3.9
Heating 2.9 3.8
Power factor 1 (Total) Cooling %81 91
Heating 86 91
Starting current 1 (Total) A 2.9 3.9
Coefficient of performance
(COP) 1 (Total)
Cooling 5.15 4.27
Heating 5.52 5.00
Compressor
Model SNB140FRUMT
Output W 950
Current 1 Cooling A2.04 3.32
Heating 2.34 3.22
Refrigeration oil (Model) L 0.35 (FV50S)
Fan motor
Model RC0J50-CI
Current 1 Cooling A0.28 0.30
Heating 0.28 0.30
Dimensions W × H × D mm 800 × 550 × 285
Weight kg 37
Special remarks
Dehumidification Cooling L/h 0.2 0.8
Air flow 1
Cooling High
m3/h
1,806
Low 1,038
Heating
High 2,016
Med. 1,710
Low 1,326
Sound
level 1
Cooling dB(A) 46 49
Heating 49 50
Fan speed
Cooling High
rpm
810
Low 490
Heating
High 900
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
OBH625A

5
Outdoor model MUZ-FH50VEHZ
Power supply Single phase, 230 V, 50 Hz
Capacity
Rated frequency (Min. - Max.)
Cooling kW 5.0 (1.9 - 6.0)
Heating 6.0 (1.7 - 8.7)
Breaker Capacity A 16
Electrical data
Power input 1 (Total) Cooling W1,380
Heating 1,480
Running current 1
(Total)
Cooling A6.1
Heating 6.5
Power factor 1 (Total) Cooling %98
Heating 98
Starting current 1 (Total) A 6.5
Coefficient of performance
(COP) 1 (Total)
Cooling 3.62
Heating 4.05
Compressor
Model SNB172FEKMT
Output W 1,200
Current 1Cooling A4.98
Heating 5.37
Refrigeration oil (Model) L 0.40(FV50S)
Fan motor
Model RC0J60-BC
Current 1 Cooling A0.83
Heating 0.84
Dimensions W × H × D mm 840 × 880 × 330
Weight kg 55
Special remarks
Dehumidification Cooling L/h 2.0
Air flow 1
Cooling
High
m3/h
3,006
Med. 3,006
Low 1,626
Heating
High 2,892
Med. 2,892
Low 2,280
Sound level 1 Cooling dB(A) 51
Heating 54
Fan speed
Cooling
High
rpm
840
Med. 840
Low 480
Heating
High 810
Med. 810
Low 650
Fan speed regulator 3
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.
OBH625A

6
Specifications and rated conditions of main electric parts
Model
Item MUZ-FH25VEHZ MUZ-FH35VEHZ
Smoothing
capacitor (C61, C62) 600 μF/ 620 μF 420 V
Diode module (DB61) 15 A 600 V
Fuse (F61) T20AL250V
(F701, F801, F901) T3.15AL250V
Defrost heater (H) 230 V 130 W
Power module (IC700) 15 A 600 V
(IC932) 8A600V
Expansion valve
coil (LEV) 12 V DC
Reactor (L61) 23 mH
Power factor
controller (IC820) 20A 600V
Circuit
protection (PTC64, PTC65) 33 Ω
Terminal block (TB) 5 P
Relay
(X63) 3 A 250 V
(X64) 20 A 250 V
(X66) 3 A 250 V
(X69) 10A 230V
R.V. coil (21S4) 220 - 240 V AC
Heater protector (26H) Open 45°C
Specifications and rated conditions of main electric parts
Model
Item MUZ-FH50VEHZ
Smoothing
capacitor
(CB1, CB2, CB3) 560 μF 450 V
Fuse
(F601, F880, F901) T3.15AL250 V
Defrost heater (H) 230 V 120 W
IGBT module (IC932) 5 A 600 V
(IC700) 20 A 600 V
Expansion valve
coil (LEV) 12 V DC
Reactor (L) 340 μH
Diode module (IC820) 20 A 600 V
Circuit
protection (PTC64, PTC65) 33 Ω
Terminal block (TB1, TB2) 3 P
Relay
(X64) 20 A 250 V
(X65) 20 A 250 V
(X69) 10 A 250 V
(X601) 3 A 250 V
(X602) 3 A 250 V
R.V. coil (21S4) 220 - 240 V AC
Heater protector (26H) Open 45 °C
OBH625A

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
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
HEATING
46
49
NC-10
MUZ-FH25VEHZ
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
49
50
NC-10
MUZ-FH35VEHZ
NOISE CRITERIA CURVES
4
Test conditions
Cooling: Dry-bulb temperature 35°C
Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OUTDOOR UNIT
MICROPHONE
1 m
MUZ-FH50VEHZ
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
51
NC-10
54
OBH625A

8
Unit: mm
MUZ-FH25VEHZ
MUZ-FH35VEHZ
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 X 21
REQUIRED SPACE
100 mm or more
350 mm or more
200 mm or more
100 mm or more
100 mm or more
Drain hole ø33
OUTLINES AND DIMENSIONS
5
MUZ-FH50VEHZ
417.5
40
42
Drain hole
175 500
330
50
Air in
Air out
2-holes 10 21
360
840
109
81
880
452
Service panel
99.5
164.5
195
35
44
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) Ø6.35
Gas refrigerant pipe joint
Refrigerant pipe
(flared) Ø12.7
350 mm or more
100 mm or more
REQUIRED SPACE
500 mm or more
100 mm or more
500 mm or more
OBH625A

9
WIRING DIAGRAM
6
MUZ-FH25VEHZ
MUZ-FH35VEHZ
OBH625A

10
MUZ-FH50VEHZ
OBH625A