Mitsubishi Electric MUZ-GA50VA-E1 User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 6
3. SPECIFICATION················································ 6
4. NOISE CRITERIA CURVES ······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ············· 12
8. PERFORMANCE CURVES ····························· 15
9. ACTUATOR CONTROL··································· 26
10. SERVICE FUNCTIONS···································· 27
11. TROUBLESHOOTING ····································· 27
12. DISASSEMBLY INSTRUCTIONS···················· 46
13. PARTS LIST····················································· 50
14. RoHS PARTS LIST·········································· 52
Models
SPLIT-TYPE AIR CONDITIONERS
MUZ-GA50VA - E1
MUZ-GA60VA - E1
MUZ-GA60VA - E2
MUZ-GA60VA - E3
MUZ-GA71VA - E1
MUZ-GA71VA - E2
HFC
utilized
R410A
NOTE:
• RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.
• Contents of SERVICE FUNCTIONS (10) have been removed.
No. OB389
REVISED EDITION-H
Indoor unit service manual
MSZ-GA•VA Series (OB388)
Please void OB389 REVISED EDITION-G.
OUTDOOR UNIT
Revision H:
• Errors in TROUBLESHOOTING have
been corrected.

2
Revision A :
• RoHS PARTS LIST has been added.
• Failure mode recall function (11-2.) has been changed.
• Check of HPS (11-6. ) has been corrected.
Revision B:
• Compressor has been changed. (MUZ-GA50/60VA)
Previous
New
Model
SNB130FLDH
SNB130FLDH1
PARTS LIST number
E02 851 900
E02 939 900
RoHS PARTS LIST number
E12 851 900
E12 939 900
Revision C:
• MUZ-GA60/71VA- E2 have been added.
• Check of outdoor thermistors (11-6. ) has been corrected.
• Contents of SERVICE FUNCTIONS (10) have been removed as these models do not have the functions.
Revision D:
• PARTS LIST and RoHS PARTS LIST have been changed.
Revision E:
• REFRIGERANT SYSTEM DIAGRAM has been changed for MUZ-GA60VA- E2 .
Revision F:
• MUZ-GA60VA- E3 has been added.
Revision G:
• The fan guard for MUZ-GA50VA- E, MUZ-GA60VA- Eand MUZ-GA71VA- Ehas been changed.
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 H:
• Errors in TROUBLESHOOTING have been corrected.

3
1TECHNICAL CHANGES
Refrigeration
oil
Refrigerant
New refrigerant
R410A
HFC-32: HFC-125 (50%: 50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-51.4
1.557
64
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
Non
Non
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-40.8
0.94
44.4
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
Non
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (°C)
Steam pressure [25°C](Mpa)
Saturated steam density [25°C](kg/m3)
Combustibility
ODP 1
GWP 2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
1: Ozone Depletion Potential : based on CFC-11
2: Grobal Warming Potential : based on CO2
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
• This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer.
• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air
conditioners.
As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/
materials are required. Refer to the table below.
Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
MUZ-A18YV - E1 MUZ-GA50VA - E1
MUZ-A24YV - E1 MUZ-GA60VA - E1
MUZ-A26YV - E1 MUZ-GA71VA - E1
1. Indication of capacity has been changed. (BTU base kW base)
2. Outdoor electronic control P.C. board has been changed.
3. Noise filter P.C. board has been changed.
4. Length of fan motor lead wire has been changed.
5. Shape of relay panel has been changed.
6. Signal of terminal block has been changed.
MUZ-GA60VA - E1 MUZ-GA60VA - E2
1. Compressor has been changed. (SNB130FLDH1 SNB130FLEH1)
2. Outdoor electronic control P.C. board has been changed.
MUZ-GA71VA - E1 MUZ-GA71VA - E2
1. Outdoor electronic control P.C. board has been changed.
MUZ-GA60VA - E2 MUZ-GA60VA - E3
1. Compressor has been changed. (SNB130FLEH1 SNB130FGBH)
2. Outdoor electronic control P.C. board has been changed.
3. Refrigerant circuit has been changed.

4
-30 -20 -10 0 10 20 30 40 50 60
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
(MPa [Gauge])
R410A
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
NOTE: The unit of pressure has been changed to MPa on the
international system of units (SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/cm2[Gauge])
R410A tools Can R22 tools be used?
Gas leak detector
R410A has high pressures beyond the measurement range of existing
gauges. Port diameters have been changed to prevent any other refrigerant
from being charged into the unit.
Hose material and cap size have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
6.35 mm and 9.52 mm
Description
Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
Provided for flaring work (to be used with R22 flare tool).
Provided to prevent the back flow of oil. This adapter enables you to use
vacuum pumps.
It is difficult to measure R410A with a charging cylinder because the
refrigerant bubbles due to high pressure and high-speed vaporization.
No
No
No
Yes
Yes
New
New
New
Gauge manifold
Charge hose
Torque wrench
Flare tool
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
No : Not Substitutable for R410A Yes : Substitutable for R410A
No 12.7 mm and 15.88mm
1.Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being
charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.
NOTE: The unit of pressure has been changed to MPa on the international system of units (SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/cm2 [Gauge])
New Specification Current Specification
The incompatible refrigeration oil easily separates from
refrigerant and is in the upper layer inside the suction muffler.
Raising position of the oil back hole enables to back the
refrigeration oil of the upper layer to flow back to the
compressor.
Since refrigerant and refrigeration oil are compatible,
refrigeration oil goes back to the compressor through the
lower position oil back hole.
Compressor
Suction muffler
Oil back hole
Refrigeration oil
Refrigerant
Compressor
Suction muffler
Oil back hole
Refrigeration oil /Refrigerant
Compressor

55
Electronic scale for refrigerant charging
Outdoor unit
Refrigerant gas
cylinder
operating valve
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Service port
Gauge manifold
valve (for R410A)
Union
Liquid pipe
Gas pipe
Stop valve
Indoor unit
Charge hose (for R410A)
R410A
Pipe diameter
mm
6.35
9.52
12.7
15.88
17
22
26
29
Dimension of flare nut
R22
17
22
24
27
Flaring work and flare nut
Flaring work for R410A pipe differs from that for R22 pipe.
For details of flaring work, refer to installation manual “FLARING WORK”.
3. Refrigeration oil
Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.
4. Air purge
• Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant
circuit.
• Use the vacuum pump for air purging for the purpose of environmental protection.
5. Additional charge
For additional charging, charge the refrigerant from liquid phase of the gas cylinder.
If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the
outdoor unit. In this case, capacity of the refrigeration cycle decreases or normal operation can be impossible. However,
charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.
2. Refrigerant piping
Specifications
Use the refrigerant pipes that meet the following specifications.
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88).
Never use any pipe with a thickness less than 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88), as the pressure resistance is
insufficient.
Wall
thickness
Outside diameter
Pipe mm
For liquid
For gas
6.35
9.52
12.7
15.88
0.8 mm
0.8 mm
0.8 mm
1.0 mm
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material

6
PART NAMES AND FUNCTIONS
2
Air inlet
Piping
Air outlet
(back and side)
Drain hose
Drain outlet
ACCESSORIES
Drain socket
Drain cap Ø33
1
2
E1
E2
E3
Single phase
230V,50Hz
20
7.46
0.30
SNB130FLDH or SNB130FLDH1
850
U-V 0.45 W-U 0.45
V-W 0.45
RC0J60-AA
BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2
840x850x330
53
2
1.8
NEO22
Cooling
5.0(0.9-5.9)
2.5
2,940/1,650
6.23
1,410
98.4
5.93
3.42
53/51
800/480
Heating
5.9(0.9-7.8)
—
2,940/2,210
7.01
1,580
98.0
6.71
3.62
55/53
800/620
Outdoor model
Function
Power supply
Capacity Rated frequency (Min.-Max.)
Dehumidification
Air flow (High/Low)
Breaker capacity
Running current
Power input
Power factor
Starting current 1
Compressor motor current 1
Fan motor current
Model
Output
Winding
resistance(at 20°C)
Model
Winding
resistance (at 20°C)
Dimensions WxHxD
Weight
Sound level (High/Low)
Fan speed (High/Low)
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)
kW
/h
m3/h
A
A
W
%
A
A
A
W
Ω
Ω
mm
kg
dB
rpm
kg
Compressor
Fan motor
Special remarks
Coefficient of performance(C.O.P) 1
Capacity
Electrical data
Single phase
230V,50Hz
20
11.2
0.30
TNB220FMCH
1,300
U-V 1.41 W-U 1.41
V-W 1.41
RC0J60-AA
BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2
840x850x330
58
2
2.0
NEO22
Heating
8.1(0.9-9.6)
—
2,940/2,210
10.6
2,390
98.0
10.3
3.31
55/53
800/620
MUZ-GA71VA
Single phase
230V,50Hz
20
8.93
0.30
SNB130FLDH or SNB130FLDH1
SNB130FLEH1
SNB130FGBH
850
U-V 0.45 W-U 0.45
V-W 0.45
RC0J60-AA
BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2
840x850x330
53
2
1.8
NEO22
Cooling
6.0(0.9-6.7)
3.0
2,940/1,650
8.23
1,870
98.8
7.93
3.11
53/51
800/480
Heating
6.8(0.9-8.1)
—
2,940/2,210
8.33
1,880
98.1
8.03
3.51
55/53
800/620
MUZ-GA60VA
MUZ-GA50VA
Cooling
7.1(0.9-8.3)
3.8
2,940/1,650
10.4
2,360
98.7
10.1
2.93
53/51
800/480
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry bulb temperature 27 Wet bulb temperature 19
Outdoor Dry bulb temperature 35 Wet bulb temperature (24 )
Heating: Indoor Dry bulb temperature 20 Wet bulb temperature 15
Outdoor Dry bulb temperature 7 Wet bulb temperature 6
Refrigerant piping length (one way): 5m
1 Measured under rated operating frequency.
3SPECIFICATION
MUZ-GA50VA
MUZ-GA60VA
MUZ-GA71VA

7
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
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
MUZ-GA50VA
MUZ-GA60VA
MUZ-GA71VA
OUTDOOR UNIT
MICROPHONE
1m
COOLING
FUNCTION SPL(dB(A)) LINE
High
FAN SPEED
HEATING
53
55
Test conditions
Cooling: Dry-bulb temperature 35°C
Wet-bulb temperature (24°C)
Heating: Dry-bulb temperature 7°C
Wet-bulb temperature 6°C
Model
Item
Smoothing capacitor
Current transformer
Current transformer
Fuse
Fuse
Fuse
Intelligent power module
High pressure switch
Intelligent power module
Reactor
Expansion valve coil
Power factor controller
Resistor
Resistor
Resistor
Solenoid coil relay
Terminal block
Terminal block
Relay
R.V. coil
MUZ-GA50VA
(CB1,2,3)
(CT1,2)
(CT61)
(F64)
(F801)
(F911)
(HC930)
(HPS)
(IPM)
(L)
(LEV)
(PFC)
(R64A,B)
(R937A,B)
(RS1~4)
(SSR61)
(TB1)
(TB2)
(X64)
(21S4)
MUZ-GA60VA MUZ-GA71VA
560μF 450V
ETQ19Z68AY
ETQ19Z53AY
250V 2A
250V 3.15A
250V 1A
PS21661-RZ
ACB-DB156 (for )
PS21244-A
340μH 20A
DC 12 V
PS51259-A
10Ω10W
1.1Ω2W 2%
0.04Ω7W
TLP3506
3P
3P
G4A
AC 220 ~ 240 V
ACB-DB156
–
E3
Specifications and rated conditions of main electric parts

8
5OUTLINES AND DIMENSIONS
Unit: mm
MUZ-GA50VA
MUZ-GA60VA
MUZ-GA71VA
30°
35°
155
90
198
40
515
299
66
34
51
330
360
850
430
500
80
121
840
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
Service panel
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) Ø12.7 (MUZ-GA50)
Ø15.88 (MUZ-GA60/71)
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) Ø6.35 (MUZ-GA50/60)
Ø9.52 (MUZ-GA71)
REQUIRED SPACE

9
WIRING DIAGRAM
6
R64B
YLW
230V~
12-24V
CN912
CN663
WHT
BLU
NOISE FILTER P.C.BOARD
BRN
TO INDOOR UNIT CONNECTING
RED
S3
RT65
21
CN61
13
GRN/YLW
5
PFC
GRN
LD9
POWER BOARD
RT64
21
CN3
RED
WHT
RS2
RS1
R64A
RS3
RS4
F801
CN901
NR64
ELECTRONIC CONTROL P.C.BOARD
CB1
CB2
CB3
HC930
IPM
NF
BLK BLK BLK
BLK WHT RED YLW BLU ORN PNK GRY
BLU WHT
GRN
GRN
BLU
BLU
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK RED
BLU
L
CT2 CT1
SSR61
U
6
CN7954123 78
CN661
W
CN4
TB2
S1
1
CN601
3
S2
1 567
CN702
5321
CN781
13
CN701
12 12
CN931
LD1LD2
T801
R937A R937B
CN801
231 34512
MF
CN932
3X64 5123
LDE2
12
CT61
TAB1
F64
F911
LDE1
21S4
POWER SUPPLY ~/N 230V 50Hz
TAB2
N
PE
L
TB1
CIRCUIT BREAKER
4 1
RED YLW
3 2
RED
S R
21
CN903
21
CN902
21
CN5
6543 1
CN2
27
TAB4 V
MC
W
U
V
WHT
RT61 RT62 RT68
LEV
:Terminal block :Connector 3.Symbols below indicate. 2.Use copper conductors only (for field wiring).
diagram for servicing.
refer to the indoor unit electric wiring
1.About the indoor side electric wiringNOTES:
SYMBOL
NAME
SYMBOL
NAME
CURRENT TRANSFORMER
FUSE (T1AL 250V)
LEV EXPANSION VALVE COIL
LREACTOR
IPM INTELLIGENT POWER MODULE
CT61
FUSE (T2AL 250V)
F64
CT1, 2 CURRENT TRANSFORMER
HC930 INTELLIGENT POWER MODULE
F911
F801 FUSE (T3.15AL 250V)
SMOOTHING CAPACITOR
CB1~3
OUTDOOR FAN MOTOR
POWER FACTOR CONTROLLER
NOISE FILTER
RT61
DISCHARGE TEMPERATURE THERMISTOR
RS1~4 RESISTOR
R937A, B
RESISTOR
MF
MC COMPRESSOR
R64A,B RESISTOR
PFC
NF
NR64 VARISTOR
AMBIENT TEMPERATURE THERMISTOR
SOLENOID COIL RELAY
21S4 R.V. COIL
X64 RELAY
TB1 TERMINAL BLOCK TB2 TERMINAL BLOCK
RT65
FIN TEMPERATURE THERMISTOR
RT64
T801 TRANSFORMER
SSR61
RT68 OUTDOOR HEAT EXCHANGER
TEMPERATURE THERMISTOR
DEFROST THERMISTOR
RT62
NAME
SYMBOL
MUZ-GA50VA
MUZ-GA60VA - E1
MUZ-GA60VA - E2

10
MUZ-GA60VA - E3