Mitsubishi Electric MU-A09WA User manual

SERVICE MANUAL
Wireless type
Models
MU-A09WA
MU-A12WA
MU-A12WA- 1
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································6
4. OUTLINES AND DIMENSIONS ·························8
5. WIRING DIAGRAM ············································9
6. REFRIGERANT SYSTEM DIAGRAM··············10
7. DATA·································································12
8. TROUBLESHOOTING······································16
9. DISASSEMBLY INSTRUCTIONS ····················17
10. PARTS LIST······················································22
10-1. PARTS LIST·············································22
10-2. RoHS PARTS LIST··································24
NOTE:
This service manual describes technical data of the outdoor units.
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS PARTS
LIST (RoHS compliant).
Indoor unit service manual
MS-A•WA Series (OB448)
MU-A12WA
MU-A09WA
TM
HFC
utilized
R410A
No. OB449
REVISED EDITION-A
Revision : A
●MU-A12WA- has been added.
1
Please void OB449.
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2
1TECHNICAL CHANGES
MU09TW ➔MU-A09WA
MU12TN ➔MU-A12WA
1.Outdoor unit model has been changed.
2.Refrigerant has been changed. (R22 ➔ R410A)
3.Compressor has been changed.
MUA12WA ➔MU-A12WA-
1.WIRING DIAGRAM has been changed.
1
Refrigeration
oil
Refrigerant
New refrigerant
R410A
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-60.5
225.82
3.995
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
-41.4
136.34
2.772
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 (°F)
Steam pressure [77°F](PSIG)
Saturated steam density [77°F](lb/ft3)
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 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.
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
• MU-A12WA- has been added.
1
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3
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 each,
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
-22 -4 14 32 50 68 86 104 122 140
-73
0
73
145
218
290
363
435
508
580
(PSIG)
R410A
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
(°F)
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4
R410A tools Can R22 tools be used?
Gas leak detector
R410A has high pressures beyond the measurement range of existing
gauges.
Hose material have been changed to improve the pressure resistance.
Dedicated for HFC refrigerant.
1/4in. and 3/8in.
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 1/2in. and 5/8in.
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.
R410A
Pipe diameter
inch
1/4
3/8
1/2
5/8
17 (11/16)
22 (7/8)
26 (1-1/32)
29 (1-5/32)
Dimension of flare nut
R22 mm(in.)
17 (11/16)
22 (7/8)
24 (15/16)
27 (1-1/16)
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”.
2.Refrigerant piping
1Specifications
Use the copper or copper-alloy seamless pipes for refrigerant that meet the following specifications.
Wall thickness (in)
Outside diameter(in)
1/4
3/8
1/2
5/8
0.0315
0.0315
0.0315
0.0394
Heat resisting foam plastic
Specific gravity 0.045 Thickness 0.315 in
Insulation material
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5
2PART NAMES AND FUNCTIONS
MU-A09WA
Air inlet
(back and side)
Air outlet
Drain outlet
Piping
Drain hose
Air inlet
Air outlet
(back and side)
Drain outlet
Piping
Drain hose
MU-A12WA
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)
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 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.
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6
3SPECIFICATION
Item Model MS-A12WA
Capacity
Rated(Minimum~Maximum)
Power consumption
Rated(Minimum~Maximum)
EER [SEER]
OUTDOOR UNIT MODEL
External finish
Power supply
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
Compressor
Refrigerant control
Sound level
Dimensions
Weight
REMOTE CONTROLLER
REFRIGERANT PIPING
Refrigerant pipe size
(Min. wall thickness)
Connection method
Between the indoor
& outdoor units
Refrigerant charge (R410A)
Refrigerating oil (Model)
Btu/h
W
V, phase, Hz
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
Ib.
in.
in.
ft.
ft.
cc
Munsell 3Y 7.8/1.1
115, 1, 60
Capillary tube
Wireless type
Not supplied
1/4 (0.0315)
Flared
Flared
35
65
350 (NE022)
12,000
1,070
11.2 [13.0]
MU-A12WA
20
16
0.926
RN110WHDHT
C-R 0.66 C-S 1.23
10.82
56
52
33-7/16
11-7/16
23-13/16
96
1/2 (0.0315)
3lb. 1oz.
9,500
870
10.9 [13.0]
MU-A09WA
15
14
0.63
RN092WHDHT
C-R 0.81 C-S 1.49
9.30
47
47
31-1/2
11-1/4
21-5/8
78
3/8 (0.0315)
2lb.5oz.
❈1❈2
❈1
❈1
Cooling
Cooling
Cooling
MS-A09WA
Model
Winding resistance (at 68˚F) Ω
W
D
H
Liquid
Gas
Indoor
Outdoor
Height difference
Piping length
NOTE : Test conditions are based on ARI 210/240.
❈1 : Rating conditions(cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB)
OB449A.qxp 06.5.9 11:13 AM Page 6

7
Operating Range
Cooling Maximum
Minimum
Indoor intake air temperature
95˚FDB, 71˚FWB
67˚FDB, 57˚FWB
Outdoor intake air temperature
115˚FDB
67˚FDB
SEER
(Cooling)
ARI
Mode
"A" Cooling Steady State
at rated compressor Speed
"B-2" Cooling Steady State
at rated compressor Speed
"B-1" Cooling Steady State
at minimum compressor Speed
Low ambient Cooling Steady State
at minimum compressor Speed
Intermediate Cooling Steady State
At Intermediate compressor Speed
Test Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
80
80
80
80
80
67
67
67
67
67
95
82
82
67
87
(75)
(65)
(65)
(53.5)
(69)
(Unit : [˚F])
❈2
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8
4OUTLINES AND DIMENSIONS
Unit : inch
MU-A09WA
MU-A12WA
13-31/32
13-3/4 13/16
1-15/16
13-9/16 12-3/16
11-7/16
Drainage
hole [5/8
Drainage
3holes [1-5/16
9-3/4
3-17/32
1-3/8
Air in
Air out
Air in
23-13/16
11-1/2
13/16
19-11/16
7-3/16 3-3/16
2-1/4
33-7/16
6-3/16
3-15/16
1-3/16
6-5/16
30
35
Service panel
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) [1/4
Gas refrigerant
pipe joint
Rfrigerant pipe
(flared) [1/2
REQUIRED SPACE
4 in. or more
4 in. or more
4 in. or more
14 in. or more
20 in. or more
Liquid pipe : 1/4 (flared)
Gas pipe : 3/8 (flared)
6-23/32
2
5-7/8
2-23/32
1-3/4
15-3/4
12 ~ 12-3/4
13-9/16
11/16
1-9/16
7/8
21-5/8
11-1/32
13/32
31-1/2
19-11/16
5-15/16
11-29/32
17/3229/32 11-1/4
Air in
handle
Air in
Air out
2- 3/8o13/16 Oval hole
Drainage hole 1-5/8
REQUIRED SPACE Basically open 4inch or more
without any obstruction in front
and on both sides of the unit.
14 in. or more
8 in. or more
4 in. or more
4 in. or more
Open two sides of left,
right, or rear side.
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9
WIRING DIAGRAM5
MU-A09WA
MU-A12WA
OB449A.qxp 06.5.9 11:13 AM Page 9

10
6REFRIGERANT SYSTEM DIAGRAM
Refrigerant flow in cooling
Capillary tube
Compressor
Service port Service port
Muffler
Stop valve
(with service port)
Stop valve
Strainer
#100
Outdoor
heat
exchanger
Refrigerant pipe
(Option){1/4
(with heat insulator)
Refrigerant pipe
{3/8
(with heat insulator)
Flared
connection
Flared
connection
O.D. 0.118 x I.D. 0.055 x 21-21/32
({3.0 x {1.4 x 550)
MU-A09WA Unit : inch (mm)
MU-A12WA- 1
OB449A.qxp 06.5.9 11:14 AM Page 10

11
Max. Height
difference
B
Additional Piping
Max. length
A
Indoor
unit
Outdoor unit
MAX. HEIGHT DIFFERENCE
Outside
diameter Minimum
Wall
thickness Outside
diameter Minimum
Wall
thickness
Model Additional piping
Max. length
A
Additional piping
Max. length
B
65 35
Gas Piping size : in.Refrigerant piping : ft Liquid
[ 3/8
[ 1/2 [ 1/40.0315 0.0315
MU-A09WA
MU-A12WA
MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE
ADDITIONAL REFRIGERANT CHARGE(R410 : oz.)
NOTE : Calculation : Xoz.=1.08/5oz./ft ✕ (Refrigerant piping length (ft)-25)
Model Outdoor unit precharged
2lb. 5oz.
3lb. 1oz.
MU-A09WA
MU-A12WA
Refrigerant piping length (one way)
35ft25ft 30ft 40ft 45ft 50ft 55ft 60ft 65ft
2.160 1.08 3.24 4.32 5.40 6.48 7.56 8.64
Service port Service port
Capillary tube
Stop valve
(with service port)
Stop valve
Compressor
Strainer
#100
Outdoor heat
exchanger
Refrigerant pipe
(Option){1/4
(with heat insulator)
Refrigerant pipe
{1/2
(with heat insulator)
Flared
connection
Flared
connection
Muffler
Refrigerant flow in cooling
O.D. 0.118 x I.D. 0.063 x 27-9/16
({3.0 x {1.6 x 700)
MU-A12WA
OB449A.qxp 06.5.9 11:14 AM Page 11

12
7DATA
7-2. PERFORMANCE CURVE
NOTE : A point on the curve shows the reference point.
MS-A09WA MS-A12WA
Model Refrigerant piping length (one way)
MS-A09WA
MS-A12WA 1.0
25ft (std)
0.954
40ft
0.878
65ft
Model
Indoor air Outdoor intake air DB temperature (˚F)
MS-A09WA
MS-A12WA
71
67
63
71
67
63
11.6
11.0
10.4
14.7
13.9
13.1
6.4
7.5
8.4
8.3
9.7
10.9
0.77
0.73
0.70
0.95
0.90
0.86
10.9
10.3
9.6
13.7
13.0
12.1
5.9
7.0
7.8
7.8
9.1
10.1
0.85
0.80
0.77
1.04
0.99
0.95
10.2
9.5
8.9
12.9
12.0
11.3
5.6
6.5
7.3
7.3
8.4
9.4
0.91
0.87
0.83
1.12
1.07
1.02
9.5
8.8
8.1
12.0
11.2
10.3
5.2
6.0
6.6
6.8
7.8
8.6
0.96
0.92
0.89
1.18
1.13
1.09
8.7
8.1
7.4
11.0
10.3
9.4
4.8
5.5
6.0
6.3
7.2
7.8
1.00
0.97
0.92
1.23
1.19
1.13
TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC
IWB
(˚F)75 85 95 105 115
Notes 1.IWB : Intake air wet-bulb temperature.
TC : Total Capacity (x103 Btu/h), SHC : Sensible Heat Capacity (x103 Btu/h)
TPC : Total Power Consumption (kW)
2.SHC is based on 80˚F of indoor intake air DB temperature.
7-1. PERFORMANCE DATA
1) COOLING CAPACITY
MS-A09WA MS-A12WA
2) COOLING CAPACITY CORRECTIONS
71
67
63
71
67
63
71
67
63
71
67
63
Outdoor intake air DB temperature (°F)
Indoor intake air WB temperature (°F)
Indoor intake air WB temperature (°F)
Cooling
SHF at rating condition = 0.68
= 300CFM
Airflow
Cooling
SHF at rating condition = 0.70
= 363CFM
Airflow
67 75 85 95 105 115
Total power consumption (kW) Total capacity ( o10 Btu/h)
16
14
12
10
8
1.3
0.8
0.9
1.0
1.1
1.2
Outdoor intake air DB temperature (°F)
Indoor intake air WB temperature (°F)
Indoor intake air WB temperature (°F)
67 75 85 95 105 115
Total power consumption (kW) Total capacity ( o10 Btu/h)
14
12
10
8
6
1.1
0.6
0.7
0.8
0.9
1.0
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13
7-3. Condensing pressure
Data is based on the condition of indoor humidity 50%.
Air flow should be set at High.
A point on the curve shows the reference point.
MU-A09WA
86
80
75
70
70 75 80 85 90 95 100 105( F)
260
300
340
380
420
460
440
400
360
320
280
70 75 80 85 90 95 100 105( F)
100
120
140
160
180
200
68
Condensing pressure
Outdoor ambient temperature
(PSIG)
86
80
75
70
Indoor DB temperature (°F)
Indoor DB temperature (°F)
(PSIG)
68
Suction pressure
Outdoor ambient temperature
MU-A12WA
86
80
75
70
70 75 80 85 90 95 100 105( F)
260
300
340
380
420
460
440
400
360
320
280
70 75 80 85 90 95 100 105( F)
100
120
140
160
180
200
68
Condensing pressure
Outdoor ambient temperature
(PSIG)
86
80
75
70
Indoor DB temperature (°F)
Indoor DB temperature (°F)
(PSIG)
68
Suction pressure
Outdoor ambient temperature
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14
7-4. STANDARD OPERATION DATA
MS-A09WA
Cooling
9500
0.68
0.87
MS-A09WA
115, 1, 60
0.019
0.27
MU-A09WA
115, 1, 60
0.851
6.74
0.63
372
144
154
110
48
146
25
2Ib. 5oz.
80
67
57
56
1160
300 (Wet)
95
—
830
1083
Capacity
SHF
Input
INDOOR UNIT MODEL
Power supply (V, phase, Hz)
Input
Fan motor current
OUTDOOR UNIT MODEL
Power supply (V, phase, Hz)
Input
Comp. current
Fan motor current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp
Ref. pipe length
Refrigerant charge (R22)
Intake air temperature
Discharge air temperature
Fan speed (High)
Airflow (High)
Intake air temperature
Fan speed
Airflow
Unit
Btu / h
—
kW
kW
A
kW
A
A
PSIG
PSIG
˚F
˚F
˚F
˚F
ft.
—
˚F
˚F
˚F
˚F
rpm
CFM
˚F
˚F
rpm
CFM
MS-A12WA
Cooling
12000
0.70
1.07
MS-A12WA
115, 1, 60
0.035
0.51
MU-A12WA
115, 1, 60
1.035
7.96
0.93
375
150
149
111
50
139
25
3Ib. 1oz.
80
67
59
58
1220
363 (Wet)
95
—
830
1327
DB
WB
DB
WB
DB
WB
Item
Model
Total
Electrical
circuit
Refrigerant
circuit
Indoor
unit
Outdoor
unit
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15
7-5. OPERATING RANGE
(1) POWER SUPPLY
Outdoor unit
Rating Guaranteed Voltage
Min. 103V Max. 127V 115V
115V 60Hz 1[
(2) OPERATION
Function
Cooling
Standard temperature
Maximum temperature
Minimum temperature
Maximum humidity
DB (˚F)
80
95
67
WB (˚F)
67
71
57
Indoor
78%
DB (˚F)
95
115
67
WB (˚F)
—
—
—
Outdoor
—
Condition
Intake air
temperature
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16
8 TROUBLESHOOTING
8-1. Cautions on troubleshooting
1. Before troubleshooting, check the following:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.
1).Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after
confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel,
the cabinet, the top panel and the electronic control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the
board with care NOT to apply stress on the components.
4) When connecting or disconnecting the connectors, hold the housing of the
connector. DO NOT pull the lead wires.
8-2. Instruction of trouble shooting
If indoor unit and outdoor unit doesn’t operate, please check of outdoor unit fuse F.
MU-A09WA MU-A12WA
Lead wiring
Housing point
MU-A09WA
Outdoor fan
motor (MF)
INNER
PROTECTOR
MU-A09WA
248 i9°F OPEN
INNER
PROTECTOR
MU-A12WA
248 i9°F OPEN
Measure the resistance between the terminals with a tester.
(Coil wiring temperature 14°F ~ 104°F)
Color of the
lead wire
Normal
WHT-BLK
BLK-RED 27~33"
34~41"
MU-A12WA
51~63"
62~76"
MU-A09WA MU-A12WA
WHT
RED
BLK
AUX.
MAIN
WHT
ORN
REDBLK
MAIN
AUX.
Fuse
Compressor (MC)
INNER
PROTECTOR
MU-A09WA
302 i9°F OPEN
194 i18°F CLOSE
MU-A12WA
338 i9°F OPEN
194 i18°F CLOSE
MU-A12WA-
311i9°F OPEN
194 i18°F CLOSE
1
8-3.Trouble criterion of main parts
Part name Check method and criterion
Measure the resistance between the terminals with a tester.
(Coil wiring temperature 14°F ~ 104°F)
Figure
RED
WHT
BLK
P
C
SR
Color of the
lead wire
Normal MU-A12WA
0.58~0.71"
1.09~1.33"
C-R
C-S
MU-A09WA
0.71~0.87"
1.31~1.61"
PP:INNER PROTECTOR
MU-A09WA
MU-A12WA
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17
DISASSEMBLY INSTRUCTIONS
9
OPERATING PROCEDURE PHOTOS
Photo 1
1. Removing the cabinet.
(1) Remove the screw fixing the service panel.
(2) Pull down the service panel and remove it.
(3) Remove the conduit cover.
(4) Disconnect the power supply wire and indoor/outdoor con-
necting wire.
(5) Remove the screws fixing the top panel.
(6) Remove the top panel.
(7) Remove the screws fixing the cabinet.
(8) Remove the cabinet.
(9) Remove the screws fixing the back panel.
(10) Remove the back panel.
Screws of
the cabinet
(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the
locking mechanism.
1Slide the sleeve.
2Pull the terminal while
pushing the locking
lever.
1Hold the sleeve, and
pull out the terminal
slowly.
The terminal which has the locking mechanism can be detached as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
<"Terminal with locking mechanism" Detaching points>
Connector
Sleeve
Locking lever
Photo 2
Screw of the
conduit cover
Conduit cover
Back
panel
Service
panel
Screws of
the top panel
Screw of
the cabinet
Screws
of the
top panel
9-1. MU-A09WA
Hooks
Conduit plate
Screw of
the service
panel
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18
OPERATING PROCEDURE PHOTOS
3. Removing the propeller and the outdoor fan motor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the propeller nut and the propeller.
NOTE : Loose the propeller in the rotating direction for
removal.
When attaching the propeller, align the mark on the
propeller and the motor shaft cut section.
Set the propeller in position by using the cut on the shaft
and the mark on the propeller.
(3) Remove the lead clamps and outdoor fan motor lead wires.
(4) Remove the screws fixing the outdoor fan motor.
(5) Remove the outdoor fan motor.
Photo 4
Propeller
Outdoor fan motor
connector
2. Removing the electrical parts
(1) Remove the service panel and the cabinet.(Refer to 1.)
(2) Remove the following parts.
•Compressor capacitor (C1)
•Outdoor fan capacitor (C2)
•Terminal block (TB1,TB2)
•Surge absorber (DSAR)
•Compressor contactor (52C)
Photo 3
Surge absorber (DSAR)
Outdoor fan
capacitor (C2)
Compressor contactor (52C)
Compressor capacitor (C1)
Terminal block (TB2)
Terminal
block
(TB1)
Screws of the
outdoor fan motor
Sound proof felt
Conduit
plate
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19
OPERATING PROCEDURE PHOTOS
4. Removing the compressor
(1) Remove the cabinet. (Refer to 1.)
(2) Remove the relay panel.
(3) Remove the soundproof felt.
(4) Remove the terminal cover on compressor.
(5) Disconnect lead wires from the glass terminal of the com-
pressor.
(6) Recover gas from the refrigerant circuit.
NOTE
● Recover gas from the pipes until the pressure gauge shows
0 PSIG.
(7) Disconnect the welded part of the suction pipe and dis-
charge pipe.
(8) Remove the nuts fixing the compressor.
(9) Remove the compressor.
Photo 5
Compressor
Compressor nuts
Suction pipe
Discharge pipe
Glass
terminal
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20
OPERATING PROCEDURE PHOTOS
1. Removing the cabinet
(1) Remove the screws of the cabinet.
(2) Hold the bottom of the cabinet on the both side to remove
the cabinet.
(3) Remove the the cabinet.
2. Removing the electrical parts
(1) Remove the service panel and the cabinet. (Refer to 1.)
(2) Remove the following parts.
•Compressor capacitor (C1)
•Outdoor fan capacitor (C2)
•Terminal block (TB)
9-2. MU-A12WA
Photo 1
Photo 3
Photo 2
Service
panel
Screws
of the
cabinet
Compressor
capacitor (C1) Terminal
block (TB2)
Outdoor fan
capacitor (C2)
Conduit plate
Valve
cover
Terminal
block (TB1)
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