Mitsubishi Electric MU-GF20VA User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ···································2
2. PART NAMES AND FUNCTIONS ·····················3
3. SPECIFICATION ················································4
4. NOISE CRITERIA CURVES ······························5
5. OUTLINES AND DIMENSIONS ························7
6. WIRING DIAGRAM ············································9
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES ·····························14
9. TROUBLESHOOTING ·····································29
10. DISASSEMBLY INSTRUCTIONS ····················31
Models
NOTE:
RoHS compliant products have <G> mark on
the spec name plate.
Indoor unit service manual
MS-GF•VA Series (OBH621)
MU-GF20VA - E1
MU-GF25VA - E1
MU-GF35VA - E1
MU-GF50VA - E1
MU-GF60VA - E1
MU-GF80VA - E1
PARTS CATALOG (OBB622)
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
HFC
utilized
R410A
No. OBH622
REVISED EDITION-A
Please void OBH622.
Revision A:
• MU-GF50VA-
E1
, MU-GF60VA-
E1
and
MU-GF80VA-
E1
have been added.
MU-GF20/25/35VA

2
MU-GF20VA - E1
MU-GF25VA - E1
MU-GF35VA - E1
1. New model
TECHNICAL CHANGES
1
Use the specif 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 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.
Revision A:
• MU-GF50VA-
E1
, MU-GF60VA-
E1
and MU-GF80VA-
E1
have been added.
MU-GF50VA - E1
MU-GF60VA - E1
MU-GF80VA - E1
1. New model
OBH622A

3
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MU-GF20VA MU-GF25VA MU-GF35VA
PART NAMES AND FUNCTIONS
2
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
(back and side)
MU-GF50VA
MU-GF60VA MU-GF80VA
Piping
Air outlet
Drain outlet
Air inlet
(back and side)
Drain hose
OBH622A

4
SPECIFICATION
3
Outdoor model
MU-GF20VA MU-GF25VA MU-GF35VA MU-GF50VA MU-GF60VA MU-GF80VA
Function Cooling
Power supply Single phase
230 V, 50 Hz
Capacity kW 2.3 2.5 3.45 4.85 6.4 7.8
Breaker capacity A 10 15 20 25
Electrical
data
Running current (Total) A 3.2 3.6 5.0 6.7 9.7 12.5
Power input (Total) W 710 775 1,120 1,480 2,170 2,780
Power factor (Total) % 96 94 97 96 97 97
Starting current (Total) A 14.5 19.0 27.0 33.5 57.0 79.5
Energy Eff ciency Ratio (EER) (Total) 3.24 3.23 3.08 3.28 2.95 2.81
Compressor
Model
KN083VDPMC KN092VDPMC RN135VHSMT RN174VHSMT PN25VABMT NN33VAAMT
Output W 500 650 900 1,300 1,800 2,200
Compressor motor current A2.77 3.17 4.49 6.10 8.90 11.48
Winding
resistance (at 20
°C) ΩC-R 4.52
C-S 7.07
C-R 3.62
C-S 5.40
C-R 2.69
C-S 3.51
C-R 2.12
C-S 3.40
C-R 0.95
C-S 1.48
C-R 0.68
C-S 1.80
Fan
motor
Model RA6V21-BC RA6V33-QA RA6V75-FA RA6V75-EA
Fan motor current
A
0.23 0.29 0.30 0.50 0.60
Winding
resistance (at 20
°C) ΩWHT-BLK 276
BLK-RED 233
WHT-BLK 171
BLK-RED 226
WHT-BLK 71.5
BLK-RED 89.5
WHT-BLK 64.3
BLK-RED 84.0
Dimensions W H Dmm 718 x 525 x 255
800x 550x 285 840x 880x 330
Weight kg 25 34 38 57 72
Special
remarks
Dehumidif cation /h 0.5 0.7 1.3 1.3 2.6 3.7
Air f ow (High) /h 1,716 1,722 1,860 3,174 3,018
Sound level dB 47 49 52 54 55
Fan speed (High) rpm 830 860 830
Fan speed regulator 1
Refrigerant f lling
capacity (R410A) kg 0.65 1.10 1.20 1.30 1.85
Refrigeration oil (Model) L 0.30 (FV50S) 0.52 (FV50S) 0.90 (FV50S) 1.30 (FV50S)
NOTE: Test conditions are based on ISO5151.
Cooling: Indoor Dry-bulb temperature 27 Wet-bulb temperature 19
Outdoor Dry-bulb temperature 35 Wet-bulb temperature 24
Indoor-Outdoor piping length: 5.0 m
OBH622A

5
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
47
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
47
NC-10
MU-GF20VA MU-GF25VA
MU-GF35VA
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
49
NC-10
OBH622A

6
MU-GF50VA MU-GF60VA
MU-GF80VA
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
52
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, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
54
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, 0dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
55
NC-10
OBH622A

7
Unit: mm
MU-GF20VA MU-GF25VA MU-GF35VA
Open two
sides of left,
right, or rear
side.
REQUIRED SPACE
100 mm
or more
350 mm
or more
100 mm
or more
200 mm
or more
001mm
roerom
Air out
Air in
Air in
Service port
Handle
500
Bolt pitch for installation
Service panel
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared)
ø9.52
Bolt pitch for
installation
264~280
2 holes 10 x 16
Drain hole ø33
OUTLINES AND DIMENSIONS
5
OBH622A

8
Unit: mm
MU-GF50VA
Air in
Air out
Air in
Service port
Handle
500 Bolt pitch for installation
Basically open 100mm or more
without any obstruction in front
and on both sides of the unit.
Open two sides of left,
right, or rear side.
Service panel
Liquid refrigerant pipe joint
Refrigerant pipe (flared) ø6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) ø12.7
REQUIRED SPACE
10
69
800
302.5
150
22.3
550
280
164.5
99.5
170.5
23
285
344.5
44
400
17.5
Bolt pitch for
installation
304~325
40
43°
35°
2 holes 10x21
350mm or more
200mm or more
100mm or more
100mm or more
Drain hole ø42
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 (MU-GF60VA)
(flared) Ø9.52 (MU-GF80VA)
Gas refrigerant pipe joint
Refrigerant pipe
(flared) Ø15.88
350 mm or more
100 mm or more
REQUIRED SPACE
500 mm or more
100 mm or more
500 mm or more
MU-GF60VA MU-GF80VA
OBH622A

9
MU-GF20VA MU-GF25VA MU-GF35VA
6WIRING DIAGRAM
MU-GF50VA
OBH622A

10
MU-GF60VA MU-GF80VA
OBH622A