Mitsubishi Electric MSC-A07WV User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
3. INDOOR/OUTDOOR
CORRESPONDENCE TABLE ···························8
4. INDOOR UNITS COMBINATION·······················9
5. SPECIFICATION···············································10
6. NOISE CRITERIA CURVES···························· 17
7. OUTLINES AND DIMENSIONS ······················ 20
8. WIRING DIAGRAM ··········································25
9. REFRIGERANT SYSTEM DIAGRAM··············32
10. PERFORMANCE CURVES······························45
11. MICROPROCESSOR CONTROL·····················84
12. SERVICE FUNCTIONS···································102
13. TROUBLESHOOTING····································104
14. DISASSEMBLY INSTRUCTIONS···················129
15. PARTS LIST····················································144
16. OPTIONAL PARTS·········································157
Wireless type
Models
MSC-A07WV - (WH) · MU-A07WV -
MSC-A09WV - (WH) · MU-A09WV -
MSC-A12WV - (WH) · MU-A12WV -
MSC-A07WV - (WH) · MUH-A07WV -
MSC-A09WV - (WH) · MUH-A09WV -
MSC-A12WV - (WH) · MUH-A12WV -
Multi system type
Models
MSC-A07WV - (WH) · MUX-A10WV -
MSC-A09WV - (WH) · MUX-A19WV -
MSC-A12WV - (WH) · MUX-A20WV -
· MUX-A25WV -
· MUX-A26WV -
Inverter-controlled multi system Model
· MXZ-A18WV -
E1
E1
E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
E1E1
MSC-A07WV -
MSC-A09WV -
MSC-A12WV - E1
E1
E1
No. OB307
REVISED EDITION-A
HFC
utilized
R410A
SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS
Revision:
●MXZ-A18WV - have been added.
●MSC-A07/09/12WV - Part No..have changed.
VARISTOR (NR11& NR12)
E02 336 385 ➔E02 749 385
●Please void OB307.
E1
E1
Indication of
model name
Remote
controller
OB307A1.qxp 03.2.19 3:56 PM Page 1

2
TECHNICAL CHANGES
1
MSC-07RV- ➔MSC-A07WV-
MSC-09RV- ➔MSC-A09WV-
MSC-12RV- ➔MSC-A12WV-
1. Rated voltage has changed. (220-240V➔230V)
2. Indoor model has changed.
MU-07RV- ➔MU-A07WV-
1. Refrigerant has changed. (R22➔R410A)
2. Compressor has changed. (RH130VGCT➔RN092VHSHT)
MU-09RV- ➔MU-A09WV-
1. Refrigerant has changed. (R22➔R410A)
2. Compressor has changed. (RH140VGCT➔RN099VHSHT)
MU-12RV- ➔MU-A12WV-
1. Refrigerant has changed. (R22➔R410A)
2. Compressor has changed. (RH220VHAT➔RN135VHSHT)
MUH-07RV- ➔MUH-A07WV-
1. Refrigerant has changed. (R22➔R410A)
2. Compressor has changed. (RH130VGCT➔RN092VHSHT)
MUH-09RV- ➔MUH-A09WV-
1. Refrigerant has changed. (R22➔R410A)
2. Compressor has changed. (RH165VGCT➔RN104VHSHT)
MUH-12RV- ➔MUH-A12WV-
1. Refrigerant has changed. (R22➔R410A)
2. Compressor has changed. (RH220VHAT➔RN135VHSHT)
MUX-10RV- ➔MUX-A10WV-
1. Outdoor model has changed.
2. Refrigerant has changed. (R22➔R410A)
MUX-19TV- ➔MUX-A19WV-
MUX-20TV- ➔MUX-A20WV-
MUX-25TV- ➔MUX-A25WV-
1. Refrigerant has changed. (R22➔R410A)
MUX-24RV- ➔MUX-A26WV-
1. Outdoor model has changed.
2. Refrigerant has changed. (R22➔R410A)
MXZ-18TV - ➔MXZ-A18WV -
• Outdoor model has changed.
• Refrigerant has changed.
E1E2
E1E2
E1E1
E1E1
E1E1
E1E2
E1E4
E1E4
E1E4
E1E4
E1E4
E1E4
E1E4
E1E4
E1E4
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3
Refrigerating
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 (:)
Steam pressure [25:](Mpa)
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter : based on CO2
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
• This room air conditioner adopts an 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 conditioners.
1As 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.
2Take 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.
3For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
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/ff[Gauge])
New Specification Current Specification
The incompatible refrigerating 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
refrigerating oil of the upper layer to flow back to the
compressor.
Since refrigerant and refrigerating oil are compatible each,
refrigerating oil backs to the compressor through the lower
position oil back hole.
Compressor
Suction muffler
Oil back hole
Refrigerating oil
Refrigerant
Compressor
Suction muffler
Oil back hole
Refrigerating oil /Refrigerant
Compressor
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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/ff[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 R410Awith 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
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.
2.Refrigerant piping
1Specifications
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. Never use any pipe with a thickness less
than 0.8mm, as the pressure resistance is insufficient.
Wall
thickness
Outside diameter
Pipe mm
For liquid
For gas
6.35
9.52
12.7
0.8 mm
0.8 mm
0.8 mm
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material
OB307A1.qxp 03.2.19 3:57 PM Page 4

5
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
17
22
26
Dimension of flare nut
R22
17
22
24
2Flaring 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.Refrigerant 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, ability of the refrigerating 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.
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6
PART NAMES AND FUNCTIONS
2
INDOOR UNIT
MSC-A07WV -
MSC-A09WV -
MSC-A12WV - E1
E1
E1
Emergency operation switch
Operation section
Horizontal vane
Air filter
Air outlet
Deodorizing filter
(Gray sponge type)
Vertical vane
Air inlet
to Breaker
Remote control
receiving section
Remote controller
Display section
(When the front panel is opened)
Operation indicator lamp
Receiving section
Air cleaning filter
(White bellows type)
Power supply cord
Panel
Front panel
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side) Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
OUTDOOR UNIT
MU-A07WV - MUH-A07WV -
MU-A09WV - MUH-A09WV -
MU-A12WV - MUH-A12WV - E1E1
E1E1
E1E1 MUX-A10WV- E1
OB307A1.qxp 03.2.19 3:57 PM Page 6

7
OUTDOOR UNIT
Air inlet
Piping
Drainage hose
(Back and side)
Air outlet
Drain outlet
MUX-A26WV- E1
Air outlet
Drain outlet
Air inlet
Piping
Drainage hose
(Back and side)
MUX-A19WV- MUX-A25WV-
MUX-A20WV- E1
E1E1
ACCESSORIES
MSC-A07WV-
MSC-A09WV-
MSC-A12WV- E1
E1
E1 MUH-A07WV-
MUH-A09WV-
MUH-A12WV- E1
E1
E1
Installation plate
Installation plate fixing screw 4 o25 mm
Remote controller holder
Fixing screw for 33.5 o16 mm
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
Deodorizing filter
Air cleaning filter
Refrigerant oil
1
5
1
2
2
1
1
1
1
1
<Indoor unit>
1
2
3
4
5
6
7
8
9
0
Drain socket
Drain cap 1
2
<Outdoor unit: MUH type>
1
2
Air outlet
Drain outlet
Air inlet
(Back and side)
MXZ-A18WV- E1
MXZ-A18WV- E1
Drain socket
Drain cap 1
2
1
2
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8
MUX-A19WV- E1
MUX-A25WV- E1
MUX-A20WV- E1 MUX-A10WV- E1
MUX-A26WV- E1
Combination of
the connectable
indoor units
OUTDOOR UNIT
A: MSC-A12WV- E1
B: MSC-A07WV- E1
A:
B:
MSC-A09WV- E1
C:
A:
MSC-A07WV- E1
B:
A:
MSC-A12WV- E1
B:
C:
MSC-A09WV- E1
D:
A:
MSC-A12WV- E1
B:
MSC-A07WV - MSC-A09WV - MSC-A12WV - E1E1E1
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL COOL
DRY
PM
CLOCK
AM
RESET CLOCK
HEAT
/FAN
/
Open the front lid.
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
TEMPERATURE buttons
OPERATION SELECT button
FAN SPEED CONTROL button OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE CONTROL button
CLOCK SET button
REMOTE CONTROLLER
INDOOR/ OUTDOOR CORRESPONDENCE TABLE3
OB307A1.qxp 03.2.19 3:57 PM Page 8

9
❈There is no combination other than this table.
MXZ-A18WV- E1
OUTDOOR UNIT
Combination of the
connectable indoor units
07+07
07+09
07+12
09+09
09+12
12+12
INDOOR UNITS COMBINATION
4
07
09
12
07+07
07+09
07+12
09+09
09+12
12+12
90
90
90
90
90
90
90
90
90
3.62
3.91
5.70
7.15
7.73
7.78
8.60
8.84
8.99
2.3
(0.9-2.95)
2.5
(0.9-3.30)
3.4
(0.9-4.00)
4.6
(1.49-5.30)
4.8
(1.49-5.40)
5.0
(1.51-5.60)
5.0
(1.51-5.55)
5.3
(1.53-5.80)
5.4
(1.55-6.00)
0.750
(0.225-1.000)
0.810
(0.225-1.070)
1.180
(0.220-1.450)
1.480
(0.370-2.060)
1.600
(0.370-2.070)
1.610
(0.365-2.100)
1.780
(0.370-2.105)
1.830
(0.365-2.110)
1.860
(0.370-2.130)
–
–
–
2.3
2.5
2.98
2.5
3.1
2.65
2.3
2.5
3.4
2.3
2.3
2.02
2.5
2.2
2.65
Indoor units
combination Unit A Unit B
Cooling capacity (kW)
Total Outdoor unit
power consumption
(kW)
Current
(A) Power factor
(%)
230V
NOTE: Electrical data is for outdoor unit only.
MXZ-A18WV - E1
NOTE: Electrical data is for outdoor unit only.
07
09
12
07+07
07+09
07+12
09+09
09+12
12+12
90
90
90
90
90
90
90
90
90
4.73
5.14
6.76
9.32
9.37
9.03
9.28
8.91
8.55
3.3
(0.9-4.0)
3.6
(0.9-4.5)
4.0
(0.9-4.8)
6.1
(1.53-6.70)
6.2
(1.53-6.80)
6.5
(1.55-7.00)
6.5
(1.55-7.0)
6.55
(1.56-7.1)
6.6
(1.58-7.2)
0.980
(0.225-1.115)
1.065
(0.225-1.195)
1.400
(0.220-1.680)
1.930
(0.300-2.070)
1.940
(0.300-2.040)
1.870
(0.295-1.980)
1.920
(0.295-2.010)
1.845
(0.295-1.950)
1.770
(0.290-1.850)
–
–
–
3.05
3.23
3.88
3.25
3.77
3.30
3.3
3.6
4.0
3.05
2.97
2.62
3.25
2.78
3.30
Indoor units
combination Unit A Unit B
Heating capacity (kW)
Total Outdoor unit
power consumption
(kW)
Current
(A) Power factor
(%)
230V
MXZ-A18WV - E1
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10
SPECIFICATION
5
Indoor model
Function
Indoor unit power supply
Air flow(High/Med. /Low )
Power outlet
Running current
Power input
Power factor
Starting current
Fan motor current
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Air direction
Sound level(High/Med. /Low )
Fan speed (High/Med. /Low )
Fan speed regulator
Thermistor RT11(at 25:)
Thermistor RT12(at 25:)
Outdoor model
Capacity
Dehumidification
Outdoor air flow
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level
Fan speed
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigerating oil (Model)

K/h
A
A
W
%
A
A
"
mm
kg
dB
rpm
k"
k"
kW
R/h
K/h
A
A
W
A(kW)
%
A
A
A
W
"


"
mm
kg
dB
rpm
kg
cc
MSC-A07WV - E1
Single phase
230V,50Hz
10
0.17
35
90
—
0.17
WHT-BLK 413
BLK-RED 334
815O278O217
9
5
3
10
10
MU-A07WV - E1
Single phase
230V,50Hz
10
—
2.76
0.22
RN092VHSHT
600
C-R 3.87
C-S 6.14
RA6V23-FC
WHT-BLK 353
BLK-RED 321
780o540o255
34
45
735
1
0.75
350 (NEO22 )
Cooling
474/372 /276
RC4V19-LA
36/31 /25
900/750 /600
2.3
0.9
1,686
2.98
675
98
23
3.24
MSC-A09WV - E1
Single phase
230V,50Hz
10
0.17
35
RC4V19-LA
WHT-BLK 413
BLK-RED 334
815O278O217
9
5
3
10
10
MU-A09WV - E1
Single phase
230V,50Hz
10
—
RN099VHSHT
700
C-R 3.40
C-S 4.56
RA6V23-FC
WHT-BLK 353
BLK-RED 321
780o540o255
34
45
735
1
0.80
350 (NEO22 )
Cooling
474/384 /306
90
—
0.17
36/31 /25
900/770 /650
2.55
1.1
1,686
3.26
745
99
24
3.04
0.22
3.27
MSC-A12WV - E1
Single phase
230V,50Hz
582/444 /324
10
0.19
40
RC4V19-KA
WHT-BLK 316
BLK-RED 299
815O278O217
10
5
3
10
10
MU-A12WV - E1
Single phase
230V,50Hz
1.6
1,914
10
4.91
—
97
29
RN135VHSHT
900
C-R 2.79
C-S 3.36
RA6V33-DC
WHT-BLK 301
BLK-RED 332
780o540o255
36
49
825
1
0.83
620 (NEO22)
Cooling
92
—
0.19
40/33 /26
930/760 /600
3.45
1,100
4.60
0.31
3.03
Electrical data
Fan motor
Special remarks
Compressor
Electrical data
Fan motor
Special remarks
Capacity
Coefficient of performance(C.O.P)
Outdoor unit power supply
Capacity
ww
ww
wwwwww
ww
ww
ww
ww ww
ww
ww
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB24°C
Indoor-Outdoor piping length 5m
wReference value
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