Mitsubishi Electric MU-A07YV -E1 User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························6
5. OUTLINES AND DIMENSIONS ·························7
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM················8
8. PERFORMANCE CURVES································9
9. TROUBLESHOOTING······································20
10. DISASSEMBLY INSTRUCTIONS·····················23
11. PARTS LIST······················································26
Wireless type
Models
MU-A07YV -
MU-A09YV -
MU-A12YV -E1
E1
E1
MU-A07YV -
MU-A09YV -
MU-A12YV - E1
E1
E1
No. OB330
REVISED EDITION-A
HFC
utilized
R410A
SPLIT-TYPE, AIR CONDITIONERS
Indication of
model name
NOTE:
•This service manual describes technical data of outdoor units.
•As for indoor units MSC-A07YV - , MSC-A09YV - and MSC-A12YV - ,
refer to the service manual OB329.
•As for indoor unit MCF-A12WV - , refer to the service manual OB338.
E1
E1E1E1
Revision A:
●MU-A12YV - can be connected to
MCF-A12WV - .
E1
E1
Please void OB330.
OB330-1.qxp 04.3.2 0:57 PM Page 1

TECHNICAL CHANGES
1
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.
MU-A07WV- ➔MU-A07YV-
MU-A09WV- ➔MU-A09YV-
1. Outdoor heat exchanger has changed.
2. Outdoor fan motor has changed. (RA6V23-FC➔RC6V20-AC)
MU-A12WV- ➔MU-A12YV-
1. Outdoor heat exchanger has changed.
2. Outdoor fan motor has changed. (RA6V33-DC➔RA6V33-FC)
E1E1
E1E1
E1E1
Revision A:
•MU-A12YV - can be connected to MCF-A12WV - .
SPECIFICATION and PERFORMANCE CURVES have been added.
E1E1
2
OB330-1.qxp 04.3.2 0:57 PM Page 2

3
-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.
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
OB330-1.qxp 04.3.2 0:57 PM Page 3

4
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.
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
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5
PART NAMES AND FUNCTIONS
2
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
OUTDOOR UNIT
MU-A07YV -
MU-A09YV -
MU-A12YV - E1
E1
E1
SPECIFICATION
3
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)
kW
R/h
K/h
A
A
W
A(kW)
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
MU-A07YV - E1
Single phase
230V,50Hz
10
2.78
0.22
RN092VHSHT
600
C-R 3.87
C-S 6.14
RC6V20-AC
WHT-BLK 410
BLK-RED 433
780o540o255
34
45
735
1
0.60
350 (NEO22 )
2.3
0.9
1,686
3.00
680
–
98
23
3.22
MU-A09YV - E1
Single phase
230V,50Hz
10
RN099VHSHT
700
C-R 3.40
C-S 4.56
RC6V20-AC
WHT-BLK 410
BLK-RED 433
780o540o255
34
45
735
1
0.60
350 (NEO22 )
2.55
1.1
1,686
3.32
760
–
99
24
3.10
0.22
3.21
MU-A12YV - E1
Indoor unit
MSC-A12YV - E1
Single phase
230V,50Hz
1.7
1,914
10
4.92
97
29
RN135VHSHT
900
C-R 2.79
C-S 3.36
RA6V33-FC
WHT-BLK 223
BLK-RED 228
780o540o255
36
49
825
1
0.75
620 (NEO22)
3.5
1,100
–
4.61
0.31
3.07
Compressor
Electrical data
Fan motor
Special remarks
Capacity
Coefficient of performance(C.O.P)
Outdoor unit power supply
Outdoor model MU-A12YV - E1
Indoor unit
MCF-A12WV - E1
Single phase
230V,50Hz
1.5
1,914
10
4.89
98
29
RN135VHSHT
900
C-R 2.79
C-S 3.36
RA6V33-FC
WHT-BLK 223
BLK-RED 228
780o540o255
36
49
825
1
0.75
620 (NEO22)
3.5
1,104
–
4.58
0.31
3.02
NOTE: Test conditions are based on ISO 5151.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB24°C
Indoor-Outdoor piping length : 5m
OB330-1.qxp 04.3.2 0:57 PM Page 5

NOISE CRITERIA CURVES
6
4
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
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
Test conditions,
Cooling :DB35:WB24:
MU-A12YV- E1
COOL
FUNCTION
49
SPL(dB(A)) LINE
OUTDOORUNIT
MICROPHONE
1m
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
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
Test conditions,
Cooling : DB27:WB19:
MU-A07YV- E1
MU-A09YV- E1 COOL
FUNCTION
45
SPL(dB(A)) LINE
OB330-1.qxp 04.3.2 0:57 PM Page 6

7
OUTLINES AND DIMENSIONS
5
WIRING DIAGRAM
6
MODELS WIRING DIAGRAM
OUTDOOR UNIT
MU-A07YV - MU-A09YV - MU-A12YV - E1E1E1
CIRCUIT BREAKER
POWER SUPPLY
~/N
230V 50Hz
12V
GRN/YLW
TB2
RED
WHT
BLK
WHT
BLU 3
2
1
RED MF
C2
MC
C1
SR
C
N
2
TO
INDOOR UNIT
CONNECTING
WHT
BLU
BLK
RED
WHT
52C
TB1
WHT
BLK
52C
PE
L
1
NO COM
DSAR
BRN
BRN
SYMBOL
TB1,TB2
52C
SYMBOL
MC
MF
SYMBOL
C1
C2
DSAR
NAME NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
COMPRESSOR(INNER PROTECTOR)
TERMINAL BLOCK
COMPRESSOR CONTACTOR
OUTDOOR FAN MOTOR
(INNER FUSE/INNER PROTECTOR)
NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.
2. Use copper conductors only. (For field wiring)
3. Symbols below indicate.
/: Terminal block, : Connector
320
25
43-
35-
155
90
104
74
260
10
780
500
122
40
540
320 285 255
Service panel
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) [9.52 (MU-A07/A09YV)
[12.7 (MU-A12YV)
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) [6.35
Air out
Air in
Air in
109 32
110
147
Drainage
3holes [33
100mm or more
100mm or more
100mm or more
350mm or more
REQUIRED SPACE
400mm or more
Unit: mm
OUTDOOR UNIT
MU-A07YV - MU-A09YV - MU-A12YV - E1E1E1
OB330-1.qxp 04.3.2 0:57 PM Page 7

REFRIGERANT SYSTEM DIAGRAM
8
7
MU-A07YV -
MU-A09YV - E1
E1
MU-A12YV - E1
OUTDOOR UNIT
OUTDOOR UNIT
Outdoor
heat
exchanger
Capillary tube
[3.0x[1.4x900
Strainer
#100
Refrigerant pipe [6.35
(with heat insulator) Refrigerant flow in cooling
Unit:mm
Refrigerant pipe [12.7
(with heat insulator)
Stop valve
(with service port)
Stop valve
(with service port)
Strainer
#100
Refrigerant pipe [6.35
(with heat insulator)
Stop valve
Capillary tube
[3.0x[1.4x550
Refrigerant flow in cooling
Outdoor
heat
exchanger
Compressor
Compressor
Flared connection
Flared connection
Flared connection
Flared connection
Muffler
Muffler
Unit:mm
Refrigerant pipe [9.52
(with heat insulator)
OB330-1.qxp 04.3.2 0:57 PM Page 8

9
Piping size O.D : mm Length of connecting pipe : m
Model Refrigerant piping
Max. length : m
A
20
25
Indoor unit
Gas 0.43
Liquid 0.5
Gas
9.52
12.7
Liquid
6.35
Outdoor unit
Gas 0
Liquid 0
MU-A07YV - E1
MU-A09YV - E1
MU-A12YV - E1
Indoor
unit
w Max. Height
difference 10m
Height difference should be within
10m regardless of which unit,
indoor or outdoor position is high. Outdoor unit
Refrigerant Piping
Max.length
A
Model Refrigerant piping length (one way)
Outdoor unit precharged
600
750
25m
360
7m
0
10m
60
15m
160
20m
260
MU-A07YV - E1
MU-A09YV - E1
MU-A12YV - E1
Calculation : Xg=20g/m x(A-7)m
MAX. HEIGHT DIFFERENCE
ADDITIONAL REFRIGERANT CHARGE(R410A : g)
MAX. REFRIGERANT PIPING LENGTH
PERFORMANCE CURVES
8
The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions,
since operating conditions vary according to the areas where these units are installed. The following information has been pro-
vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198~264V
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature : °CWB
(2) Indoor outlet air wet-bulb temperature : °CWB
(3) Outdoor intake air dry-bulb temperature : °CDB
(4) Total input: W
Indoor air wet/dry-bulb temperature difference on the left side of the chart on next page shows the difference between the
indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.
How to measure the indoor air wet-bulb/dry-bulb temperature difference
1. Attach at least 2 sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air
speed is high.
2. Attach at least 2 sets of wet-and dry-bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of room.
5. Press the EMERGENCY OPERATION switch once to start the EMERGENCY COOL MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
}
Cooling
MU-A07YV - MU-A09YV - MU-A12YV - E1E1E1
OB330-1.qxp 04.3.2 0:57 PM Page 9

10
8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
COOL operation
①Both indoor and outdoor unit are under the same temperature/humidity condition.
➁Air flow should be set at MAX.
Dry-bulb temperature Relative humidity(%)
20 50
25 60
30 70
③The 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] )
INDOOR UNIT OUTDOOR UNIT
Wet-and dry-bulb
thermometers Wet-and dry-bulb
thermometers
MSC-A07YV - E1
MU-A07YV - E1 MU-A12YV - E1
MSC-A12YV - E1
MU-A09YV - E1
MSC-A09YV - E1
8.5
7.8
7.1
6.4
5.8
5.1
9.6
8.8
8.0
7.2
6.5
5.7
11.0
10.0
9.1
8.2
7.4
6.5
MU-A12YV - E1
MCF-A12WV - E1
9.7
8.9
8.1
7.3
6.6
5.8
8-1.CAPACITY AND THE INPUT CURVES
18 32
230V
15 20
50 25 60 30 70(%)
35(:)
0.7
0.8
0.9
1.0
1.1
1.2
1.3
7
8
9
10
11
12
13
15 20
50 25 60 30 70(%) 35(:)
1
2
4
3
18 32
230V
Outdoor low pressure
Ambient temperature(˚C) Ambient humidity(%) Ambient temperature(˚C) Ambient humidity(%)
MU-A07YV - E1 MU-A07YV - E1
Outdoor unit current (A)
(kgf/F[Gauge])(MPa[Gauge])
OB330-1.qxp 04.3.2 0:57 PM Page 10