Mitsubishi Electric MU-A18WV-E1 User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························7
5. OUTLINES AND DIMENSIONS ·························8
6. WIRING DIAGRAM ············································9
7. REFRIGERANT SYSTEM DIAGRAM··············11
8. PERFORMANCE CURVES······························14
9. MICROPROCESSOR CONTROL ····················22
10. TROUBLESHOOTING······································25
11. DISASSEMBLY INSTRUCTIONS·····················32
12. PARTS LIST······················································38
Wireless type
Models
MU-A18WV -
MU-A24WV -
MU-A30WV - E1
E1
E1
SPLIT-TYPE, AIR CONDITIONERS
MU-A18WV - E1
Indication of model name
NOTE:
•This service manual describes technical data of outdoor units.
As for indoor units MS-A18WV- , MS-A24WV- and MS-A30WV- , refer to the service manual
OB325. E1E1E1
No. OB326
REVISED EDITION-A
Revision A:
●Resistance of LEV (Expansion valve) has been
modified.
● Power input and others have been added to
SPECIFICATION.
HFC
utilized
R410A
Please void OB326.
OB326A-1.qxp 04.2.9 10:41 AM Page 1

TECHNICAL CHANGES
2
1
MU-18RV - ➔MU-A18WV -
1. Refrigerant has changed. (R22➔R410A)
2. Refrigerant system diagram has changed.
• Diameter of stop valve has changed. (Gas: [15.88➔[12.7)
• Accumulator has removed.
3. Oil separator has been added.
4. Compressor has changed. (PH33VPET➔RN196VHSHT)
MU-30RV - ➔MU-A30WV -
1. Outdoor model has changed.
2. Refrigerant has changed. (R22➔R410A)
3. Refrigerant system diagram has changed.
• Accumulator has removed.
4. Compressor has changed. (NH56VNHT➔NN37VAAHT)
E1E1
E1E1
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.
Revision A:
•Resistance of LEV (Expansion valve) has been modified. (30.3 "~ 37.0 "➔41.0 "~ 49.0 ")
TROUBLESHOOTING has been partially modified.
•Running current, power input and power factor have been added.
SPECIFICATION has been partially modified.
MU-24RV - ➔MU-A24WV -
1. Refrigerant has changed. (R22➔R410A)
2. Refrigerant system diagram has changed.
• Diameter of stop valve has changed.
(Liquid: [9.52➔[6.35)
3. Compressor has changed. (NH47VMDT➔NN29VBAHT)
E1E1
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3
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
-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 and 15.88 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.
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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
15.88
17
22
26
29
Dimension of flare nut
R22
17
22
24
27
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 (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
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5
PART NAMES AND FUNCTIONS
2
Drainage hose
Piping
Air inlet Air inlet
Air outlet
Drain outlet
(back and side)
Air outlet
(back and side)
OUTDOOR UNIT
MU-A18WV -
MU-A24WV - E1
E1 MU-A30WV - E1
SPECIFICATION
3
Outdoor model
Function
Power supply
Capacity
Dehumidification
Air flow(High)
Power outlet
Running current
Power input
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(High)
Fan speed(High)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigerating oil (Model)
kW
r/h
K/h
A
A
W
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
MU-A18WV - E1
Cooling
Single phase
230V, 50Hz
5.0
2.5
2,196
15
7.90
1,750
96
37
7.51
0.39
2.76
RN196VHSHT
1,300
C-R 1.80
C-S 3.00
RA6V50-OG
WHT-BLK 116
BLK-RED 111
850o605o290
44
52
828
1
1.40
520 (NEO22)
MU-A24WV - E1
Cooling
Single phase
230V, 50Hz
6.5
3.4
2,322
25
10.82
2,420
97
74
10.27
0.55
2.62
NN29VBAHT
1,900
C-R 0.80
C-S 1.64
RA6V60-MA
WHT-BLK 71
BLK-RED 89
850o605o290
60
53
873
1
1.90
1,200 (NEO22)
Electrical data
Compressor
Fan motor
Special remarks
Coefficient of performance(C.O.P)
Capacity
NOTE: Test conditions are based on JIS C 9612.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB(24°C)
Indoor-Outdoor piping length : 5m
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6
Outdoor model
Function
Power supply
Capacity
Dehumidification
Air flow(High/Low )
Power outlet
Running current
Power input
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(High/Low )
Fan speed(High/Low )
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigerating oil (Model)
Thermistor RT62(at 25:)
Thermistor RT63(at 0:)
kW
R/h
K/h
A
A
W
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
k"
k"
MU-A30WV - E1
Cooling
Single phase
230V, 50Hz
8.5
4.6
2,940/1,470
25
14.42
3,191
96
90
13.85
0.57
2.61
NN37VAAHT
2,500
C-R 0.64
C-S 1.63
RA6V75-AB
WHT-BLK 62.8 BLK-YLW 55.9
YLW-RED 26.0
840o850o330
75
55/53
805/435
2
2.30
1,300 (NEO 22)
231.44
33.18
Electrical data
Compressor
Fan motor
Special remarks
Coefficient of performance(C.O.P)
Capacity
w
w
ww
ww
NOTE: Test conditions are based on JIS C 9612.
Cooling : Indoor DB27°C WB19°C
Outdoor DB35°C WB(24°C)
Indoor-Outdoor piping length : 5m
wReference value
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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
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
52
SPL(dB(A)) LINE
High
FAN SPEED
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
MU-A18WV- E1 MU-A24WV- E1
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
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
55
SPL(dB(A)) LINE
High
FAN SPEED
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
MU-A30WV- E1
OUTDOOR UNIT
MICROPHONE
1m
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
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Test conditions,
Cooling : Dry-bulb temperature 35:Wet-bulb temperature 24:
53
SPL(dB(A)) LINE
High
FAN SPEED
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OUTLINES AND DIMENSIONS
8
5
MU-A30WV- E1
OUTDOOR UNIT
Unit: mm
OUTDOOR UNIT
MU-A18WV- MU-A24WV- E1E1
100mm or more
100mm or more
100mm or more
350mm or more
500mm or more
Drainage
3holes [33 Air out
Air in
Air in
Service panel
Liquid refrigerant
pipe joint
Refregerant pipe
(flared) [6.35
Gas refregerant
pipe joint
Refregerant pipe
(flared) [12.7 (MU-A18WV)
[15.88 (MU-A24WV)
35-
30-
30
100
161
157
74
850
500
183
20 292
605 248
35
350
50
290 310 345
20
355
90
Drainage
hole [16.2
30-
35-
155
90
198
40
515
299
66
34
51
330
360
850
430
500 80
121
840
Open as a rule
500mm or more if
the front and both
sides are open
100mm or more
200mm or more if
there are obstacles
to both sides
Open as a rule
500mm or more if the back,
both sides and top are open 350mm or more
100mm or more
Service panel
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) [15.88
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) [9.52
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9
WIRING DIAGRAM
6
MU-A24WV - E1 MODEL WIRING DIAGRAM
OUTDOOR UNIT
TB1
RED MC
~/N
230V 50Hz
POWER SUPPLY
52C
GRN/YLW
PE
N
CIRCUIT BREAKER
X1
NO
L
NO
REDRED
WHT
BLU
ORN
C2 WHT
3
4BLK
1
2ORN
COM
BLU
COM
52C BLK S
MF
R
C
12V
INDOOR UNIT
CONNECTING
TO X1
1BLK
BRN
WHT
2
TB2
DSAR
WHT
C1
BLU
BRN
WHT
BRN
BRN
MU-A18WV - E1 MODEL WIRING DIAGRAM
OUTDOOR UNIT
BRN
WHT
WHT
POWER SUPPLY
230V 50Hz
~/N
TB1
CIRCUIT BREAKER
PE
BLU
N
GRN/YLW
BRN
L
NO COM
52C
TB2
CONNECTING
12V
INDOOR UNIT
TO
BLK
1
WHT
2
52C
C2
4
WHT
ORN
RED
2
3
1
RED
C1
BLK
BLK
ORN
WHT
RED
MF
R
MC
S
C
DSAR
BLU
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. : Connector
: Terminal block
NOTES:
SYMBOL
C1
C2
DSAR
NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
SYMBOL
MC
MF
TB1,TB2
NAME
COMPRESOR (INNER PROTECTOR)
OUTDOOR FAN MOTOR (INNER PROTECTOR)
TERMINAL BLOCK
SYMBOL
52C NAME
COMPRESSOR CONTACTOR
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. : Connector
: Terminal block
NOTES:
SYMBOL
C1
C2
DSAR
NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
SYMBOL
MC
MF
TB1,TB2
NAME
COMPRESSOR (INNER PROTECTOR)
OUTDOOR FAN MOTOR (INNER PROTECTOR)
TERMINAL BLOCK
SYMBOL
X1
52C
NAME
RELAY
COMPRESSOR CONTACTOR
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10
OUTDOOR UNIT
DEICER
P. C. BOARD
YLW
BLK
WHT
RED
BRN
7
1
CN730
YLW
BLK WHT
CIRCUIT BREAKER
152C 2
CZ WHTWHT
RED C2
ORN
A1 A2
BLU 52C
DSAR
TO INDOOR UNIT CONNECTING
12V
WHT
C1
BLK
SC
R
MC
RED
BLU
NR61 3
5
BLU
T61
TB1
L
N
TB2
3
N
PE
GRN/YLW
POWER SUPPLY
~/N 230V 50Hz
X52
BLU
BRN
BLU
BRN
SR62
SR61
COM NO
F61
TAB52
X52
CN711
CN724
CN662
6
MF
RT62 RT63
123
21
ORN RED
3456
LEV
SYMBOL
SR62
TB1
TB2
T61
X52
52C
SYMBOL
MC
MF
NR61
RT62
RT63
SR61
SYMBOL
CZ
C1
C2
DSAR
F61
LEV
NAME NAME NAME
CZ SURGE ABSRBER
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
SURGE ABSORBER
FUSE(3.15A)
EXPANSION VALVE COIL
COMPRESSOR (INNER PROTECTOR)
OUTDOOR FAN MOTOR (INNER PROTECTOR)
VARISTOR
DISCHARGE TEMPERATURE THERMISTOR
AMBIENT TEMPERATURE THERMISTOR
SOLID STATE RELAY
SOLID STATE RELAY
TERMINAL BLOCK
TERMINAL BLOCK
TRANSFORMER
CONTACTOR
COMPRESSOR CONTACTOR
NOTE 1. Use copper conductors only (For field wiring).
2. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (3,N).
3. Symbols below indicate.
/: Terminal block, : Connector
MU-A30WV - E1 MODEL WIRING DIAGRAM
OB326A-1.qxp 04.2.9 10:41 AM Page 10