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Revision A:
• MUZ-FE18NA has been added.
Please void OBH543.
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
HFC utilized
R410A
No. OBH543
REVISED EDITION-A
Models
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
MUZ-FE09NA
MUZ-FE12NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Indoor unit service manual
MSZ-FE•NA Series (OBH542)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 2
3. SPECIFICATION ················································ 3
4. OUTLINES AND DIMENSIONS ························ 5
5. WIRING DIAGRAM ············································ 6
6. REFRIGERANT SYSTEM DIAGRAM ··············· 7
7. DATA ·································································· 9
8. ACTUATOR CONTROL ··································· 16
9. SERVICE FUNCTIONS ··································· 17
10. TROUBLESHOOTING ····································· 17
11. DISASSEMBLY INSTRUCTIONS ···················· 36
PARTS CATALOG (OBB543)
TM
Revision A:
• MUZ-FE18NA has been added.
1 TECHNICAL CHANGES
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
1. New model
2 PART NAMES AND FUNCTIONS
MUZ-FE09NA MUZ-FE12NA
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
MUZ-FE18NA
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
2
3 SPECIFICATION
Outdoor unit model MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA
Capacity
Rated (Minimum~Maximum)
Capacity Rated
Power consumption
Rated (Minimum~Maximum)
Power consumption Rated
HSPF IV 4
Cooling 1
Heating 47 1
Heating 17 2
Cooling 1
Heating 47 1
Heating 17 2
EER 1 [SEER] 3 Cooling
Btu/h 9,000 (2,800~9,000) 12,000 (2,800~12,000) 18,000 (8,200~25,200)
Btu/h 10,900 (3,000~18,000) 13,600 (3,000~21,000) 21,600 (7,500~29,700)
Btu/h
W
W
W
12,500
580 (160~650)
710 (150~2,250)
1,730
13,600
930 (160~960)
950 (150~2,250)
1,780
19,300
1,270 (570~2,280)
1,540 (520~2,420)
2,180
15.5 [26.0]
Heating 10.0
12.9 [23.0]
10.6
COP Heating
Min. circuit ampacity
Fan motor
1 4.50
Power supply
Max. fuse size (time delay)
V , phase , Hz
A
A
F.L.A
15
12
0.56
Model SNB130FQAH
4.20
208/230, 1 , 60
14.2 [20.2]
10.3
4.11
20
17.1
0.93
SNB172FQKMT
Compressor
12.9
16.1
0.40 (FV50S)
Refrigerant control
Sound level 1
Defrost method
Dimensions
W
D
H
R.L.A 8.6
L.R.A 10.8
Refrigeration oil L (Model) 0.45 (NEO22)
Linear expansion valve
Cooling dB(A)
Heating dB(A)
48
49
48
49
Reverse cycle in.
in.
in.
31-1/2
11-1/4
21-5/8
55
55
33-1/16
13
34-5/8
119
External fi nish
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
VDC
Refrigerant pipe size
(Min. wall thickness)
Connection method
Between the indoor
& outdoor units
Liquid in.
1/4 (0.0315)
Gas in.
3/8 (0.0315)
Indoor Flared
Outdoor Flared
Height difference
Piping length
Refrigerant charge (R410A) ft.
ft.
40
65
2 lb. 9 oz.
Munsell 3Y 7.8/1.1
Wireless type
12 - 24
Not supplied
3/8 (0.0315)
5/8 (0.0315)
Flared
Flared
50
100
4 lb. 3 oz.
NOTE: Test conditions are based on AHRI 210/240.
2:
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB Rated frequency
3
Test condition
3, 4
ARI
Mode Test
Indoor air condition (°F)
Dry bulb Wet bulb
"A-2" Cooling Steady State at rated compressor Speed
"B-2" Cooling Steady State at rated compressor Speed
80
80
67
67
Outdoor air condition (°F)
Dry bulb Wet bulb
95
82
SEER
(Cooling)
"B-1" Cooling Steady State at minimum compressor Speed
"F-1" Cooling Steady State at minimum compressor Speed
"E-V" Cooling Steady State at Intermediate compressor Speed 5
"H1-2" Heating Steady State at rated compressor Speed
"H3-2" Heating at rated compressor Speed
HSPF
(Heating)
"H0-1" Heating Steady State at minimum compressor Speed
"H1-1" Heating Steady State at minimum compressor Speed
80
80
80
70
70
70
70
67
67
67
60
60
60
60
82
67
87
47
17
62
47
"H2-V" Heating at Intermediate compressor Speed 5
70 60 35
5 : At Intermediate compressor Speed
= ("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
OPERATING RANGE
(1) POWER SUPPLY
Rated voltage
Outdoor unit
208/230 V
1 phase
60 Hz
Guaranteed voltage (V)
Min. 187 208 230 Max. 253
(2) OPERATION
Mode Condition
Cooling
Heating
Standard temperature
Maximum temperature
Minimum temperature
Maximum humidity
Standard temperature
Maximum temperature
Minimum temperature
DB
80
90
67
70
80
70
Indoor
78 %
Intake air temperature (°F)
WB
67
73
57
DB
95
115
14
60
67
60
47
75
-13
Outdoor
—
WB
—
—
—
43
65
-15
4
4 OUTLINES AND DIMENSIONS
MUZ-FE09NA MUZ-FE12NA
15-3/4
Air in
Drain hole 1-5/8
REQUIRED SPACE
Air in
4 in.
or more
7/8 handle
Air out
1-9/16
2- 3/8 13/16 Oval hole
29/32 11-1/4
8 in.
or more
Open two sides of left, right, or rear side.
Unit: inch
Basically open 4 inch or more without any obstruction in front and on both sides of the unit.
4 in.
or more
14 in.
or more
5-15/16
11-29/32
19-11/16
31-1/2
MUZ-FE18NA
16-7/16
Air in
6-23/32
Liquid pipe :1/4 (flared)
Gas pipe :3/8 (flared)
2-23/32
REQUIRED SPACE
Drain hole
1-9/16
1-5/8
4 in.
or more
4 in.
or more
6-7/8
Air out
19-11/16
33-1/16
4-5/16
2-holes 13/32 13/16
3-3/16
5
20 in.
or more
14 in.
or more
Service panel
44
35
Liquid refrigerant pipe joint
Refrigerant pipe
(flared)
Ø
3/8
7-11/16
Gas refrigerant pipe joint
Refrigerant pipe
(flared)
Ø
5/8
5 WIRING DIAGRAM
MUZ-FE09NA MUZ-FE12NA
MUZ-FE18NA
6
6 REFRIGERANT SYSTEM DIAGRAM
MUZ-FE09NA MUZ-FE12NA
Refrigerant pipe ø3/8
(with heat insulator)
Flared connection
Flared connection
Refrigerant pipe ø1/4
(with heat insulator)
4-way valve
Muffler
Stop valve
(with service port)
Discharge temperature thermistor
RT62
Service port
Stop valve
(with strainer)
Muffler
Service port
Compressor
Defrost thermistor
RT61
Capillary tube
O.D. 0.118 × I.D. 0.071
× 23-5/8
(ø3.0 × ø1.8 × 600)
Expansion valve
Outdoor heat exchanger
Outdoor heat exchanger temperature thermistor
RT68
Ambient temperature thermistor
RT65
Strainer
#100
R.V. coil heating ON cooling OFF
Capillary tube
O.D. 0.118 × I.D. 0.079
× 9-7/16
( ø 3.0
× ø 2.0
× 240)
Refrigerant flow in cooling
Refrigerant flow in heating
Unit: inch
MUZ-FE18NA
Refrigerant pipe ø5/8
(with heat insulator)
4-way valve
Muffler
#100
Flared connection
Stop valve
(with service port)
Service port
Discharge temperature thermistor
RT62
Service port
Defrost thermistor
RT61
Outdoor heat exchanger
Ambient temperature thermistor
RT65
Compressor
Flared connection
Refrigerant pipe ø3/8
(with heat insulator)
Strainer
#100
Stop valve
LEV
Strainer
#100
Capillary tube
O.D. 0.157 × I.D. 0.094
× 3-15/16
(ø4.0×ø2.4×100)
Outdoor heat exchanger temperature thermistor
RT68
R.V. coil heating ON cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
7
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Model
Refrigerant piping: ft.
Max. Length
A
Max. Height difference
B
Piping size O.D: in.
Gas Liquid
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
65
100
40
50
3/8
5/8
1/4
3/8
Indoor unit
Max. Height difference
B
Max. Length
A
Outdoor unit
ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)
NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
Model Outdoor unit precharged
25
Refrigerant piping length (one way): ft.
30 40 50 60
MUZ-FE09NA
MUZ-FE12NA
2 lb. 9 oz.
0 1.62
4.86
8.10
11.34
65
12.96
Calculation: X oz. = 1.08/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
NOTE: Refrigerant piping exceeding 33 ft. requires additional refrigerant charge according to the calculation.
Model
MUZ-FE18NA
Outdoor unit precharged
4 lb. 3 oz.
33
0
40
4.14
Refrigerant piping length (one way): ft.
50
10.06
60
15.98
70
21.90
80
27.82
90
33.74
100
39.66
Calculation: X oz. = 2.96/5 oz. / ft. × (Refrigerant piping length (ft.) - 33)
8
7 DATA
MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA
7-1. PERFORMANCE DATA
1) COOLING CAPACITY
Model
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
Indoor air
IWB (˚F)
71
67
63
71
67
63
71
67
63
75
Outdoor intake air DB temperature (˚F)
85 95 105 115
TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC
11.0
6.9
0.58 10.3
6.5
0.63
9.7
6.1
0.68
9.0
5.6
0.72
8.3
5.2
0.75
10.4
9.8
7.9
8.8
0.55
0.52
9.7
9.1
7.4
8.1
0.60
0.58
9.0
8.5
6.8
7.6
0.65
0.62
8.4
7.7
6.4
6.9
0.69
0.66
7.7
7.0
5.8
6.3
0.72
0.69
14.7
8.8
0.85 13.7
8.2
0.94 12.9
7.7
1.01 12.0
7.2
1.06 11.0
6.6
1.10
13.9 10.2 0.81 13.0
9.5
0.89 12.0
8.8
0.96 11.2
8.1
1.02 10.3
7.5
1.07
13.1 11.3 0.77 12.1 10.5 0.85 11.3
9.7
0.92 10.3
8.9
0.98
9.4
8.1
1.02
22.1 15.6 1.13 20.6 14.6 1.24 19.4 13.7 1.33 18.0 12.7 1.40 16.6 11.7 1.46
20.9 17.5 1.07 19.4 16.3 1.17 18.0 15.1 1.27 16.7 14.1 1.35 15.4 12.9 1.41
19.6 19.1 1.02 18.2 17.7 1.12 16.9 16.5 1.21 15.4 15.0 1.30 14.0 13.7 1.35
NOTE: 1. IWB : Intake air wet-bulb temperature
TC : Total Capacity (x10 3 Btu/h)
SHC : Sensible Heat Capacity (x10 3 Btu/h)
TPC : Total Power Consumption (kW)
2. SHC is based on 80˚F of indoor Intake air DB temperature.
2) COOLING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.) 40 65
MUZ-FE09NA
MUZ-FE12NA
1.0
0.954
0.878
100
-
MUZ-FE18NA 1.0
0.954
0.878
0.771
3) HEATING CAPACITY
Model
MUZ-FE09NA
MUZ-FE12NA
MUZ-FE18NA
Indoor air
IDB (˚F)
70
65
75
70
65
75
70
65
75
Outdoor intake air WB temperature (˚F)
5 15 25 35 43 45 55
TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC
4.8
5.2
5.5
6.0
6.5
6.8
0.44
0.42
0.41
0.58
0.55
0.53
6.3
6.7
6.9
7.9
8.4
8.6
0.56
0.54
0.52
0.73
0.71
0.68
7.9
8.2
8.6
9.9
10.2
10.7
NOTE: 1. IDB : Intake air dry-bulb temperature
TC : Total Capacity (x10 3
Btu/h)
TPC : Total Power Consumption (kW)
2. Above data is for heating operation without any frost.
0.66
0.64
0.62
0.86
0.84
0.81
9.4
9.6
10.0
11.8
12.0
12.4
0.73
0.71
0.69
0.96
0.93
0.91
10.6
10.9
11.2
13.3
13.6
14.0
0.77
0.75
0.73
1.00
0.98
0.96
11.0
11.2
11.6
13.7
14.0
14.4
0.78
0.77
0.74
1.02
1.00
0.97
12.4
12.7
13.0
15.5
15.8
16.2
0.81
0.80
0.78
1.06
1.04
1.02
9.5
0.91
12.5
1.15
15.7
1.35
18.7
1.50
21.1
1.58
21.7
1.60
24.6
1.66
10.3
0.87
13.3
1.11
16.2
1.32
19.1
1.46
21.6
1.54
22.2
1.57
25.2
1.63
10.8
0.83
13.6
1.06
17.0
1.27
19.8
1.42
22.2
1.50
22.9
1.52
25.7
1.60
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner.
2. The compressor starts with operational frequency.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30 minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on the remote controller.
9
7-2. PERFORMANCE CURVE
Cooling
Cooling capacity (at Rated frequency)
1.5
1.4
Indoor intake air Wet-bulb temperature( F)
1.3
1.2
76
1.1
1.0
75
0.9
95
72
104 113
68
64
14 23 32 41 50 59 68 77 86
Outdoor intake air Dry-bulb temperature(°F)
MUZ-FE09NA
0.8
SHF at rating condition = 0.76
Airflow
0.7
0.6
0.5
65
Indoor intake air WB temperature (°F)
75 85 95 105
Outdoor intake air DB temperature (°F)
71
67
63
115
MUZ-FE12NA
SHF at rating condition = 0.73
Airflow = 350 CFM
1.3
1.2
1.1
1.0
0.9
0.8
0.7
Indoor intake air
WB temperature (°F)
65 75 85 95 105
Outdoor intake air DB temperature (°F)
MUZ-FE18NA
SHF at rating condition = 0.84
Airflow = 634 CFM
1.5
1.4
1.3
1.2
1.1
1.0
Indoor intake air WB temperature (°F)
0.9
65 70 75 80 85 90 95 100 105 110 115
Outdoor intake air DB temperature (°F)
71
67
63
115
71
67
63
This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity.
10
Heating
Heating capacity
(at Rated frequency)
0.9
0.8
0.7
0.6
0.5
0.4
1.3
1.2
1.1
1.0
-4
Indoor intake air Dry-bulb temperature ( F)
5 14 23 32 41 50
Outdoor intake air Wet-bulb temperature (°F)
MUZ-FE09NA
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-15
Airflow = 381 CFM
Indoor intake air
DB temperature (°F)
-5 5 15 25 35 45
Outdoor intake air WB temperature (°F)
55
75
65
65
59
68
79
59
MUZ-FE12NA
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
-15
Airflow = 420 CFM
Indoor intake air DB tem perature (°F)
-5 5 15 25 35 45
Outdoor intake air WB temperature (°F)
55 65
75
70
65
MUZ-FE18NA
Airflow = 738 CFM
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-15
Indoor intake air DB temperature (°F
)
-5 5 15 25 35 45
Outdoor intake air WB temperature (°F)
55
65
65
This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships between frequency and capacity.
11
7-3. CONDENSING PRESSURE
Cooling
Data is based on the condition of indoor humidity 50 %.
Air flow should be set to High speed.
MUZ-FE09NA
(PSIG)
580
540
500
460
420
380
340
300
260
68 70
Indoor DB temperature (°F)
75 80 85 90 95
Outdoor ambient temperature
80
70
100 105(°F)
(PSIG)
180
175
170
165
160
155
150
145
140
135
130
125
120
68 70
Indoor DB temperature (°F)
75 80 85 90 95
Outdoor ambient temperature
100 105(°F)
86
80
75
70
MUZ-FE12NA
(PSIG)
580
540
500
460
420
380
340
300
260
68 70
Indoor
DB temperature (°F)
75 80 85 90 95
Outdoor ambient temperature
80
70
100 105(°F)
(PSIG)
180
175
170
165
160
155
150
145
140
135
130
125
120
68 70
Indoor DB temperature (°F)
75 80 85 90 95
Outdoor ambient temperature
100 105(°F)
86
80
75
70
MUZ-FE18NA
(PSIG)
480
440
400
360
320
280
Indoor DB temperature (°F)
86
75
70
240
68 70 75 80 85 90 95
Outdoor ambient temperature
100 105(°F)
(PSIG)
190
Indoor DB temperature (°F)
Outdoor ambient temperature
100 105(°F)
86
80
75
70
12
Heating
Data is based on the condition of outdoor humidity 75%.
Air flow should be set to High speed.
Data is for heating operation without any frost.
MUZ-FE09NA
(PSIG)
400
(PSIG)
170
380
360
340
320
300
Indoor DB temperature (°F)
75
70
65
160
150
140
130
120
280
260
240
110
100
90
220
200
180
58Hz
80
70
60
160
140
120
-15 -10 5 10 15 20 25 30 35 40 45 50 55 60 6570(°F)
50
40
-15 -10
Outdoor ambient temperature
Indoor DB temperature
(°F)
58Hz
75
65
5 10 15 20 25 30 35 40 45 50 55 60 65 70(°F)
Outdoor ambient temperature
MUZ-FE12NA
(PSIG)
400
380
260
240
220
200
180
160
360
340
320
300
280
140
120
-15 -10 5 10 15
Indoor DB temperature (°F)
58Hz
75
70
65
20 25 30 35 40 45 50 55 60 6570(°F)
Outdoor ambient temperature
(PSIG)
170
160
150
140
130
120
110
100
90
80
70
60
50
40
-15 -10
Indoor DB temperature (°F)
58Hz
5 10 15 20 25 30 35 40 45 50 55 60 65 70(°F)
Outdoor ambient temperature
MUZ-FE18NA
(PSIG)
480
460
440
420
400
380
360
340
320
300
280
260
Indoor DB temperature (°F)
58Hz
240
-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75(°F)
Outdoor ambient temperature
75
(PSIG)
240
220
200
70
65
180
160
140
120
100
80
60
40
20
Indoor DB temperature (°F)
58Hz
75
70
65
0
-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75(°F)
Outdoor ambient temperature
13
7-4. STANDARD OPERATION DATA
Capacity
Model
Item
SHF
Input
Rated frequency
Indoor unit
Unit
Btu/h
— kW
Hz
MSZ-FE09NA MSZ-FE12NA MSZ-FE18NA
Cooling Heating Cooling Heating Cooling Heating
9,000 10,900 12,000 13,600 18,000 21,600
0.76
0.580
34
—
0.710
42
MSZ-FE09NA
0.73
0.930
51
—
0.950
52.5
MSZ-FE12NA
0.84
1.800
50.5
—
2.200
62.5
MSZ-FE18NA
Power supply
Input
Fan motor current
Outdoor unit
V, phase,
Hz kW
A
0.018
0.024
0.19/0.17
0.25/0.23
MUZ-FE09NA
208/230, 1, 60
0.024
0.030
0.25/0.23
0.32/0.29
MUZ-FE12NA
0.058
0.56/0.51
MUZ-FE18NA
Power supply
Input
Comp. current
Fan motor current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temperature ˚F
Ref. pipe length ft.
PSIG
˚F
˚F
˚F
Refrigerant charge (R410A)
Intake air temperature
Discharge air temperature
DB
WB
DB
WB
˚F
˚F
˚F
˚F
Fan speed (High)
Airfl ow (High)
Intake air temperature
Fan speed
Airfl ow
DB
WB
V, phase,
Hz kW
A
A
PSIG
0.562
2.38/2.15
376
154
142
112
53
144
208/230, 1, 60
0.686
2.98/2.70
0.906
4.05/3.66
355
0.35/0.32
402
108
145
108
36
128
2 lb. 9 oz.
80
67
59
56
70
60
99
— rpm 1,020
CFM 307 (Wet)
˚F 95
˚F rpm
CFM
1,120
381
47
— 43
810
1,102
870
1,187
148
160
117
53
146
80
67
58
55
25
70
60
101
—
1,120
350 (Wet)
95
1,220
420
47
— 43
810 870
1,102 1,187
0.920
1.212
4.12/3.72
4.47/4.04
392
1.16/1.05
373
104
158
115
34
129
151
150
111
58
132
80
67
59
56
95
—
840
4 lb 3 oz.
1,300
634 (Wet)
1,769
70
60
102
—
738
47
43
810
1,701
1.482
5.72/5.17
1.13/1.02
357
107
159
105
41
136
14
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
MUZ-FE09NA
Correction of Cooling capacity
1.5
1.5
Correction of Cooling total input
2.0
Correction of Heating capacity
3.0
Correction of Heating total input
1.5
1.0
1.0
2.0
1.0
0.5
0.5
1.0
0.5
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
MUZ-FE12NA
Correction of Cooling capacity
1.5
1.5
Correction of Cooling total input
1.5
Correction of Heating capacity
2.5
Correction of Heating total input
2.0
1.0
1.0
1.0
1.5
0.5
0.5
0.5
1.0
0.5
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
MUZ-FE18NA
Correction of Cooling capacity
1.5
2.0
Correction of Cooling total input
1.5
Correction of Heating capacity
2.0
Correction of Heating total input
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
0 50 100 150 (Hz)
The operational frequency of compressor
7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation)
1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice).
2. Test run operation starts and continues to operate for 30 minutes.
3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies).
6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on remote controller.
15
8 ACTUATOR CONTROL
MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA
8-1. OUTDOOR FAN MOTOR CONTROL
The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.
5 seconds 15 seconds
ON
Compressor
OFF
ON
Outdoor fan motor
OFF
8-2. R.V. COIL CONTROL
Heating . . . . . . . . . . . . . . . . . ON
Cooling . . . . . . . . . . . . . . . . . OFF
Dry . . . . . . . . . . . . . . . . . . . . OFF
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
<COOL> <HEAT>
5 seconds 5 seconds
Compressor
ON
OFF
R.V.coil
ON
OFF
Outdoor fan motor
ON
OFF
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Actuator
Sensor Purpose
LEV
Discharge temperature thermistor Protection
○ ○
Cooling: Coil frost prevention
Indoor coil temperature thermistor
Heating: High pressure protection
○ ○
Cooling: High pressure protection
Defrost thermistor
Fin temperature thermistor
Outdoor heat exchanger temperature thermistor
Ambient temperature thermistor
Heating: Defrosting
Protection
High pressure protection
Low ambient temperature operation
Outdoor fan motor
○
○
○
○
○
○
○ ○
16
9 SERVICE FUNCTIONS
MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA
9-1. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.).
Jumper
Defrost fi nish temperature
MUZ-FE09/12NA MUZ-FE18NA
Soldered
(Initial setting)
JS
41°F (5°C) 50°F (10°C)
None
(Cut)
50°F (10°C) 64°F (18°C)
9-2. PRE-HEAT CONTROL SETTING
PRE-HEAT CONTROL
When moisture gets into the refrigerant cycle, it may interfere the start-up of the compressor at low outside temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when outside temperature is 68°F (20
°C) or below. When pre-heat control is turned ON, compressor is energized. (About 50 W)
<JK> To activate the pre-heat control, cut the JK wire of the inverter P.C. board (Refer to 10-6.1.).
NOTE: When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.
10 TROUBLESHOOTING
MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, 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 electrical parts, be careful of the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
<Incorrect>
<Correct>
Lead wiring Housing point
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) Before servicing, check that the connector and terminal are connected properly.
3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.
4) Refer to 10-2 and 10-3.
17
10-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details can be recalled.
MSZ-FE09NA
1. Flow chart of failure mode recall function for the indoor/outdoor unit
MSZ-FE12NA
MSZ-FE18NA
Operational procedure
The cause of abnormality cannot be found because the abnormality does not recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1
Does POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERATION INDICATOR lamp (MSZ-FE18NA) on the indoor unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERATION INDICATOR lamp (MSZ-
FE18NA). 2
Judgment of indoor/outdoor abnormality
Yes
(Blinks)
Before blinking, does POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERATION INDICATOR lamp (MSZ-FE18NA) stay ON for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
No
(OFF)
Yes
The indoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the indoor unit failure mode table. (Refer to indoor unit service manual.)
Make sure to check at least two consecutive blinking cycles. 2
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities that can not be recalled with this way.
Confi rm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to 10-2.2)
1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.
The outdoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the outdoor unit failure mode table. (Refer to 10-2.3)
Make sure to check at least two consecutive blinking cycles. 3
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.
NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2. Blinking pattern when the indoor unit is abnormal:
2.5-second OFF
Blinking at 0.5second interval 2.5-second OFF
Blinking at 0.5second interval
ON
OFF
Beeps
Repeated cycle
Beeps
Repeated cycle
Beeps
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.5-
2.5-second OFF 3-second ON second interval
ON
OFF
No beep
Repeated cycle
Beeps
2.5-second OFF 3-second ON
No beep
Repeated cycle
18
Blinking at 0.5second interval
Beeps
Repeated cycle
2. Flow chart of the detailed outdoor unit failure mode recall function
Operational procedure
The outdoor unit might be abnormal.
Confi rm if outdoor unit is abnormal according to the following procedures.
Confi rm that the remote controller is in the failure mode recall function.
With the remote controller headed towards the indoor unit, press TOO
COOL or TOO WARM button to adjust the set temperature to 77˚F (25˚C).
1
Does POWER lamp(MSZ-FE09/12NA)/the upper lamp of OPERATION INDICATOR lamp(MSZ-
FE18NA) on the indoor unit blink at the interval of 0.5 seconds?
Blinks: The outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of POWER lamp (MSZ-FE09/12NA)/the upper lamp of
OPERATION INDICATOR lamp (MSZ-FE-
18NA). 2
Yes
(Blinks )
No
(OFF)
The outdoor unit is abnormal.
Check the blinking pattern, and confi rm the abnormal point with the outdoor unit failure mode table (10-2.3.).
Make sure to check at least two consecutive blinking cycles. 2
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.
The outdoor unit is normal.
Release the failure mode recall function according to the left mentioned procedure.
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" (10-2.1.).
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above.
NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2.Blinking pattern when outdoor unit is abnormal:
2.5-second OFF 3-second ON
ON
OFF
No beep
Repeated cycle
Blinking at 0.5second interval
Beeps
2.5-second OFF 3-second ON
No beep
Repeated cycle
Blinking at 0.5second interval
Beeps
Repeated cycle
19
3. Outdoor unit failure mode table
OPERATION
INDICATOR
POWER lamp
Upper lamp
(Indoor unit)
OFF
2-time fl ash
2.5 seconds
OFF
3-time fl ash
2.5 seconds
OFF
4-time fl ash
2.5 seconds
OFF
5-time fl ash
2.5 seconds
OFF
6-time fl ash
2.5 seconds
OFF
7-time fl ash
2.5 seconds
OFF
8-time fl ash
2.5 seconds
OFF
9-time fl ash
2.5 seconds
OFF
Abnormal point
(Failure mode/protection)
None (Normal)
Outdoor power system
Discharge temperature thermistor
Defrost thermistor
Fin temperature thermistor
10-time fl ash
2.5 seconds
OFF
Discharge temperature
LED indication
(Outdoor P.C. board)
—
—
1-time fl ash every
2.5 seconds
11-time fl ash
2.5 seconds
OFF
12-time fl ash
2.5 seconds
OFF
DC voltage
Each phase current of compressor
Overcurrent Compressor openphase
8-time fl ash
2.5 seconds OFF
9-time fl ash
2.5 seconds OFF
10-time fl ash
2.5 seconds OFF
14-time fl ash
2.5 seconds
OFF
Stop valve (Closed valve)
Condition Remedy
—
Overcurrent protection stop is continuously performed 3 times within
1 minute after the compressor gets started.
Thermistor shorts or opens during compressor running.
—
•
•
Reconnect connectors.
Refer to 10-5. "How to check inverter/ compressor".
• Check stop valve.
• Refer to 10-5. "Check of outdoor thermistors".
Defective outdoor thermistors can be identifi ed by checking the blinking pattern of
LED.
P.C. board temperature thermistor
Ambient temperature thermistor
Compressor synchronous abnormality (Compressor startup failure protection)
Discharge temperature
High pressure
Fin temperature/ P.C. board temperature
Outdoor fan motor
Nonvolatile memory data
MUZ-FE18NA
Power module
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
2-time fl ash
2.5 seconds OFF fl ash
2.5 seconds OFF
Large current fl ows into intelligent power module.
12-time fl ash
2.5 seconds OFF
—
—
7-time fl ash
2.5 seconds OFF
—
5-time fl ash
2.5 seconds OFF
6-time fl ash
2.5 seconds OFF
—
14-time fl ash
2.5 seconds OFF
Waveform of compressor current is distorted.
•
•
Reconnect compressor connector.
•
Refer to 10-5. "How to check inverter/ compressor".
Check stop valve.
•
•
Reconnect compressor connector.
Refer to 10-5. "How to check inverter/ compressor".
Temperature of discharge temperature thermistor exceeds 241°F (116°C), compressor stops.
Compressor can restart if discharge temperature thermistor reads 212°F
(100°C) or less 3 minutes later.
Temperature of indoor coil thermistor exceeds 158°F (70°C) in HEAT mode.
Temperature of defrost thermistor exceeds 158°F (70°C) in COOL mode.
•
•
•
•
Check refrigerant circuit and refrigerant amount.
Refer to 10-5. "Check of LEV".
Check refrigerant circuit and refrigerant amount.
Check stop valve.
Temperature of fi n temperature thermistor on the inverter P.C. board exceeds 167 ~ 176°F (75 ~ 80°C), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158 ~ 167°F (70 ~ 75°C).
Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.
Nonvolatile memory data cannot be read properly.
The interphase short circuit occurs in the output of the intelligent power module (IPM).
The compressor winding shorts circuit.
Temperature of discharge temperature thermistor has been 122°F (50°C) or less for 20 minutes.
DC voltage of inverter cannot be detected normally.
Each phase current of compressor cannot be detected normally.
Large current fl ows into intelligent power module (IPM).
The open-phase operation of compressor is detected.
The interphase short circuit occurs in the output of the intelligent power module (IPM).
The compressor winding shorts circuit.
•
•
Check around outdoor unit.
•
Check outdoor unit air passage.
Refer to 10-5. "Check of outdoor fan motor".
• Refer to 10-5. "Check of outdoor fan motor".
Refer to 10-5. "Check of inverter P.C. board".
•
•
Replace the inverter
P.C. board.
Refer to 10-5. "How to check inverter/ compressor".
•
•
Refer to 10-5. "Check of LEV".
Check refrigerant circuit and refrigerant amount.
•
•
•
Refer to 10-5. "How to check inverter/ compressor".
Reconnect compressor connector.
Refer to 10-5. "How to check inverter/ compressor".
Closed valve is detected by compressor current.
• Check stop valve
Indoor/ outdoor unit failure mode recall function
Outdoor unit failure mode recall function
—
○
○
—
—
—
—
—
—
○
—
—
—
○
—
○
○
○
○
○
○
○
○
○
○
○
○
○
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).
OPERATION INDICATOR
POWER lamp: MSZ-FE09/12NA
Upper lamp: MSZ-FE18NA
20
10-3. TROUBLESHOOTING CHECK TABLE
1
2
3
4
5
6
7
8
9
Outdoor unit does not operate.
1-time fl ash every
2.5 seconds
'Outdoor unit stops and restarts 3 minutes later' is repeated.
6-time fl ash
2.5 seconds OFF
11-time fl ash
2.5 seconds OFF
14-time fl ash
2.5 seconds OFF
2-time fl ash
2.5 seconds OFF
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
Condition Remedy
Outdoor power system
Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started, or failure of restart of compressor has repeated 24 times.
Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor, P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running.
Outdoor control system
Nonvolatile memory data cannot be read properly.
Serial signal
[POWER lamp (MSZ-FE09/12NA)/the upper lamp of OPERA-
TION INDICATOR lamp (MSZ-FE18NA) of the indoor unit lights up or fl ashes 7 times.]
The communication fails between the indoor and outdoor unit for 3 minutes.
Closed valve is detected by compressor current. Stop valve/
Closed valve
Outdoor unit
(Other abnormality)
Overcurrent protection
Discharge temperature overheat protection
Fin temperature
/P.C. board temperature thermistor overheat protection
•
•
Reconnect connector of compressor.
Refer to 10-5. "How to check inverter/compressor".
• Check stop valve.
• Refer to 10-5. "Check of outdoor thermistors".
•
•
•
Replace inverter P.C. board.
Refer to 10-5. "How to check miswiring and serial signal error.
Check stop valve.
Outdoor unit is defective.
• Refer to 10-2.2. "Flow chart of the detailed outdoor unit failure mode recall function".
Large current fl ows into intelligent power module.
MUZ-FE09/12NA
When overcurrent protection occurs within 10 seconds after compressor starts, compressor restarts after 15 seconds.
Temperature of discharge temperature thermistor exceeds 241
°F (116°C), compressor stops. Compressor can restart if discharge temperature thermistor reads 212°F (100°C) or less 3 minutes later.
•
•
Reconnect connector of compressor.
Refer to 10-5. "How to check inverter/compressor".
• Check stop valve.
• Check refrigerant circuit and refrigerant amount.
• Refer to 10-5. "Check of LEV".
Temperature of fi n temperature thermistor on the heat sink exceeds 167 ~ 176°F (75 ~ 80°C) or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158
~ 167°F (70 ~ 75°C).
•
•
•
Check around outdoor unit.
Check outdoor unit air passage.
Refer to 10-5. "Check of outdoor fan motor".
10
11
12
13
14
16
17
5-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
10-time fl ash
2.5 seconds OFF
12-time fl ash
2.5 seconds OFF
13-time fl ash
2.5 seconds OFF
1-time fl ash
2.5 seconds OFF
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
High pressure protection
Compressor synchronous abnormality
Outdoor fan motor
Each phase current of compressor
DC voltage
Frequency drop by current protection
Frequency drop by high pressure protection
Frequency drop by defrosting in COOL mode
Frequency drop by discharge temperature protection
Temperature of indoor coil thermistor exceeds 158°F (70°C) in
HEAT mode. Temperature of outdoor heat exchanger temperature thermistor exceeds 158°F (70°C) in COOL mode.
The waveform of compressor current is distorted.
Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.
Each phase current of compressor cannot be detected normally.
DC voltage of inverter cannot be detected normally.
Current from power outlet is nearing Max. fuse size.
Temperature of indoor coil thermistor exceeds 131°F (55°C) in
HEAT mode, compressor frequency lowers.
Indoor coil thermistor reads 46°F (8°C) or less in COOL mode, compressor frequency lowers.
Temperature of discharge temperature thermistor exceeds 232
°F (111°C), compressor frequency lowers.
• Check refrigerant circuit and refrigerant amount.
• Check stop valve.
•
•
Reconnect connector of compressor.
Refer to 10-5. "How to check inverter/compressor".
•
•
Refer to 10-5. "Check of outdoor fan motor.
Refer to 10-5. "Check of inverter
P.C. board.
• Refer to 10-5. "How to check inverter/compressor".
• Refer to 10-5. "How to check inverter/compressor".
•
•
•
The unit is normal, but check the following.
Check if indoor fi lters are clogged.
Check if refrigerant is short.
Check if indoor/outdoor unit air circulation is short cycled.
•
•
•
Check refrigerant circuit and refrigerant amount.
Refer to 10-5. "Check of LEV".
Refer to 10-5. "Check of outdoor thermistors".
NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to 10-6.1.
2. LED is lighted during normal operation.
Inverter P.C. board (Parts side)
The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF. Flashing
(Example) When the fl ashing frequency is “2”.
Flashing →
LED
MUZ-FE09
/12NA
MUZ-FE
18NA
0.5-second ON 0.5-second ON
LED
ON
OFF
2.5-second OFF 2.5-second OFF
21
18
Outdoor unit operates.
19
20
7-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
9-time fl ash
2.5 seconds OFF
Low discharge temperature protection
MUZ-FE09/12NA
PAM protection
PAM: Pulse Amplitude Modulation
MUZ-FE18NA
Zero cross detecting circuit
Condition Remedy
Temperature of discharge temperature thermistor has been
122°F (50°C) or less for 20 minutes.
The overcurrent fl ows into IGBT (Insulated Gate Bipolar transistor: TR821) or the bus-bar voltage reaches 320 V or more,
PAM stops and restarts.
Zero cross signal for PAM control cannot be detected.
Inverter check mode The connector of compressor is disconnected, inverter check mode starts.
•
•
This is not malfunction. PAM protection will be activated in the following cases:
1 Instantaneous power voltage drop
(Short time power failure)
2 When the power supply voltage is high.
•
Refer to 10-5. "Check of LEV".
Check refrigerant circuit and refrigerant amount.
Check if the connector of the compressor is correctly connected.
Refer to 10-5. "How to check inverter/compressor".
22
10-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-FE09NA MUZ-FE12NA MUZ-FE18NA
Part name
Defrost thermistor
(RT61)
Check method and criterion
Ambient temperature thermistor (RT65)
Measure the resistance with a tester.
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, the chart of thermistor.
Outdoor heat exchanger temperature thermistor (RT68)
Discharge temperature thermistor
(RT62)
Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.
Fin temperature thermistor (RT64)
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, the chart of thermistor.
Measure the resistance between terminals using a tester.
(Winding temperature: -4 ~ 104°F (-20 ~ 40°C))
Compressor
Normal
MUZ-FE09/12NA MUZ-FE18NA
U-V
U-W
V-W 1.52 ~ 2.17 Ω 0.83 ~ 1.18 Ω
Measure the resistance between lead wires using a tester.
(Part temperature: -4 ~ 104°F (-20 ~ 40°C))
Outdoor fan motor Color of lead wire
RED – BLK
BLK – WHT
WHT – RED
Normal
11 ~ 16 Ω
Measure the resistance using a tester.
(Part temperature: 14 ~ 104°F (-10 ~ 40°C))
R. V. coil (21S4)
Normal
0.97 ~ 1.38 kΩ
Expansion valve coil
(LEV)
Measure the resistance using a tester.
(Part temperature: 14 ~ 104°F (-10 ~ 40°C))
Normal Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
37 ~ 54 Ω
WHT
2
RED BLK
3
W
1
V
U
WHT
RED
ORN
Figure
WHT
2
RED BLK
3
W
1
V
U
LEV
23
10-5. TROUBLESHOOTING FLOW
A How to check inverter/compressor
Disconnect the connector between compressor and the intelligent power module (IPM).
Check the voltage between terminals.
See 10-5. “Check of open phase”.
Are the voltages balanced?
Yes
Check the compressor.
No
Replace the inverter P.C. board.
See 10-5. “Check of compressor”.
B Check of open phase
● With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
<< Operation method>>
Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA-
TION: Refer to 7-6.)
<<Measurement point>>
at 3 points
BLK (U) - WHT (V)
BLK (U) - RED (W)
WHT(V) - RED (W)
Measure AC voltage between the lead wires at 3 points.
NOTE: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of the inverter P.C. board fl ashes 9 times. (Refer to 10-6.1.)
C Check of compressor
Refer to 10-5. “Check of compressor winding”.
Is the compressor normal?
Yes
Refer to 10-5. “Check of compressor operation time”.
Does the compressor operate continuously?
Yes
OK.
No
No
Replace the compressor.
Refer to 10-5. “Check of compressor start failure”.
24
D Check of compressor winding
● Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the compressor terminals.
<<Measurement point>>
at 3 points
BLK - WHT
BLK - RED
WHT - RED
Measure the resistance between the lead wires at 3 points.
<<Judgement>>
Refer to 10-4.
0[Ω] ················· Abnormal [short]
Infinite [Ω] ········ Abnormal [open]
NOTE: Be sure to zero the ohmmeter before measurement.
E Check of compressor operation time
● Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current.
<<Operation method>>
Start heating or cooling operation by pressing EMERGENCY
OPERATION switch on the indoor unit.
(TEST RUN OPERATION: Refer to 7-6.)
<<Measurement>>
Measure the time from the start of compressor to the stop of compressor due to overcurrent.
<<Judgement>>
0 second
1 second
2 seconds
10 seconds
10 minutes
Compressor starts
Abnormal
(IPM failure)
(Compressor winding short)
Abnormal
(Compressor lock out)
(Starting defect)
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
Normal
F Check of compressor start failure
Confi rm that 1~4 is normal.
• Electrical circuit check
1.
Contact of the compressor connector
2.
3.
Output voltage of inverter P.C. board and balance of them (See 10-5. )
Direct current voltage between DB61(+) and (-) (MUZ-FE09/12NA)/JP715(+) and JP30(-) (MUZ-FE18NA) on the inverter P.C. board
4.
Voltage between outdoor terminal block S1-S2
Does the compressor run for 10 seconds or more after it starts?
No
Yes
After the compressor is heated with a drier, does the compressor start? 1
Yes
Compressor start failure. Activate pre-heat control.
(Refer to 9-2. "PRE-HEAT CONTROL SETTING")
No
Check the refrigerant circuit.
Check the stop valve.
Replace the compressor.
1
Heat the compressor with a drier for about 20 minutes.
Do not recover refrigerant gas while heating.
Heating part
25
G Check of outdoor thermistors
Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor.
Is the thermistor normal? (Refer to 10-6.1.)
Yes
No
Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board.
Reconnect the connector of thermistor.
Turn ON the power supply and press EMERGENCY OPERATION switch.
Does the unit operate for 10 minutes or more without showing thermistor abnormality?
Yes
OK. (Cause is poor contact.)
No
Replace the inverter P.C. board.
MUZ-FE09NA MUZ-FE12NA
Thermistor
Defrost
Discharge temperature
Symbol
RT61
Connector, Pin No.
Between CN641 pin1 and pin2
Fin temperature
RT62 Between CN641 pin3 and pin4
RT64 Between CN642 pin1 and pin2
Ambient temperature RT65 Between CN643 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3
MUZ-FE18NA
Thermistor
Defrost
Discharge temperature
Symbol
RT61
Connector, Pin No.
Between CN671 pin1 and pin2
Fin temperature
RT62 Between CN671 pin3 and pin4
RT64 Between CN673 pin1 and pin2
Ambient temperature RT65 Between CN672 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6
Inverter P.C. board
Board
Inverter P.C. board
Board
H Check of R.V. coil
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4.
In case CN721 (MUZ-FE09/12NA)/CN602 (MUZ-FE18NA) is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil.
Check if CN721 (MUZ-FE09/12NA)/CN602 (MUZ-FE18NA) is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Disconnect connector between the compressor and the intelligent power module.
Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode).
Is there 208/230 VAC between CN721 (MUZ-
FE09/12NA)/CN602 (MUZ-FE18NA) and on the inverter P.C. board 3 minutes after the power supply is turned ON?
Yes
No
Replace the inverter
P.C. board.
Replace the 4-way valve.
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector between the compressor and the intelligent power module.
Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).
Is there 208/230 VAC between CN721 (MUZ-
FE09/12NA)/CN602 (MUZ-FE18NA) on the inverter P.C. board 3 minutes after the power supply is turned ON?
Yes
No
Replace the inverter
P.C. board.
Replace the 4-way valve.
26
I Check of outdoor fan motor
MUZ-FE09NA MUZ-FE12NA
Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor.
Is the outdoor fan motor normal?
(Refer to 10-4.)
Yes
Replace the inverter P.C. board.
MUZ-FE18NA
Disconnect the connectors CN931 and CN932 from the inverter P.C. board.
Check the connection between the connector CN931 and CN932.
Is the resistance between each terminal of outdoor fan motor normal?
(Refer to 10-4.)
No
Yes
No
Replace the outdoor fan motor.
Disconnect CN932 from the inverter P.C. board, and turn on the power supply.
Rotate the outdoor fan motor manually and measure the voltage of CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
(Fixed to either 5 or 0 VDC)
No
Replace the outdoor fan motor.
No
Does the voltage between each terminal become 5 and 0
VDC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
Yes
Replace the inverter P.C. board.
27
J Check of power supply
MUZ-FE09NA MUZ-FE12NA
Disconnect the connector (CN61) between compressor and intelligent power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does POWER lamp on the indoor unit light up?
Yes
No
Is there bus-bar voltage 260-325
VDC between DB61 (+) and DB61
(–) on the inverter P.C. board?
(Refer to 10-6.1.)
No
Yes
Check the electric parts in main circuit.
Rectify indoor/outdoor connecting wire.
Yes
Is there voltage 208/230 VAC between the indoor terminal block S1 and S2?
No
Replace the indoor electronic control P.C. board.
Does LED on the inverter P.C. board light up or fl ash? (Refer to 10-6.1.)
Yes
No
Replace the inverter
P.C. board.
260-325VDC
If light up, OK.
If fl ash, refer to 10-3. DB61
Inverter P.C. board
(Solder side)
28
MUZ-FE18NA
Disconnect the connector between compressor and intelligent power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Does the upper lamp of
OPERATION INDICATOR on the indoor unit light up?
Yes
Is there bus-bar voltage 325 - 370
VDC between JP715 (+) and JP30
(–) on the inverter P.C. board?
(Refer to 10-6.1.)
No
No
Yes
Check the electric parts in main circuit.
Rectify indoor/outdoor connecting wire.
Yes
Is there voltage 208/230 VAC between the indoor terminal block S1 and S2?
No
Replace the indoor electronic control P.C. board.
Does LED on the inverter P.C. board light up or fl ash? (Refer to 10-6.1.)
Yes
If LED lights up, it is OK.
If LED fl ashes, refer to 10-3.
No
Replace the inverter
P.C. board.
JP30 JP715
325 -370 VDC
29
K Check of LEV (Expansion valve)
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds.
MSZ-FE09NA
MSZ-FE12NA
MSZ-FE18NA
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1
Expansion valve operates in full-opening direction.
1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.
Do you hear the expansion valve "click, click·······"?
Do you feel the expansion valve vibrate on touching it ?
No
Is LEV coil properly fi xed to the expansion valve?
Yes
No
Yes
OK.
Properly fi x the LEV coil to the expansion valve.
Does the resistance of LEV coil have the characteristics?
(Refer to 10-4.)
No
Replace the LEV coil.
Yes
Measure each voltage between connector pins of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
3. Pin (-) — Pin (+)
4. Pin (-) — Pin (+)
Is there about 3 ~ 5 VAC between each?
NOTE: Measure the voltage by an analog tester.
Yes
Replace the expansion valve.
No
Replace the inverter P.C. board.
NOTE: After check of LEV, do the undermentioned operations.
1. Turn OFF the power supply and turn ON it again.
2. Press RESET button on the remote controller.
30
L Check of inverter P.C. board
Check the outdoor fan motor.
(Refer to 10-5. .)
Is the fuse (F901) blown on the inverter P.C. board?
No
Yes
Check the connection of the connectors
(CN931 , CN932) of the outdoor fan motor.
If the connection is poor, make it correct.
Only for MUZ-FE18NA
Operate the outdoor unit by starting
EMERGENCY OPERATION.
Check the LED indication on the inverter P.C. board.
Does the LED fl ash 10 times?
Yes
(10-time fl ash)
No
Check the remedy following LED indication.
(Refer to 10-3.)
Replace the inverter P.C. board.
31
M How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
Yes
Turn ON the power supply.
No
Check the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
Press EMERGENCY OPERATION switch once.
No
Check the wiring.
Does the OPERATION INDICATOR lamp light up? <Confi rmation of the power to the indoor unit>
Yes
Is serial signal error indicated 6 minutes later?
Yes
No
No
Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire?
No
Yes
Correct them.
A
B
Turn OFF the power supply.
Check once more if the indoor/outdoor connecting wire is not miswiring.
Short-circuit outdoor terminal block S2 and S3. 1
Turn ON the power supply.
1. Miswiring may damage indoor electronic control P.C. board during the operation.
Be sure to confi rm the wiring is correct before the operation starts.
3. Be sure to check this within 3 minutes after turning ON.
After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes.
Is the bus-bar voltage of the inverter P.C. board normal
(Refer to "TEST POINT DIAGRAM AND VOLTAGE" in this manual.) ?
Yes
No
Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3
Yes
No
(Lighted or not lighted)
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
Replace the inverter P.C. board. 2
2. Be careful of the residual voltage of smoothing capacitor.
A
•
•
•
Turn OFF inverter-controlled lighting equipment.
Turn OFF the power supply and then turn ON again.
Press EMERGENCY OPERATION switch.
Is serial signal error indicated 6 minutes later?
Yes
No
B
•
•
Reinstall either the unit or the light away from each other.
Attach a fi lter on remote control receiving section of the indoor unit.
Replace the indoor electronic control P.C. board.
32
N Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Yes
No
Ground the unit.
Is the distance between the antennas and the indoor unit within 9.91 ft., or is the distance between the antennas and the outdoor unit within 9.91 ft.?
No
Yes
Is the distance between the TV sets or radios and the indoor unit within 3.28 ft., or is the distance between the TV sets or radios and the outdoor unit within 9.91 ft.?
No
Yes
Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.
Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Yes
Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close?
No
Yes
Replace or repair the antenna.
Replace or repair the coaxial cable.
Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas.
Even if all of the above conditions are fulfi lled, the electromagnetic noise may enter, depending on the electric fi eld strength or the installation condition (combination of specifi c conditions such as antennas or wiring).
Check the followings before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of:
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver
5. Electric fi eld intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifi er such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
33
10-6. TEST POINT DIAGRAM AND VOLTAGE
1. Inverter P.C. board
MUZ-FE09NA MUZ-FE12NA
Back side of unit
Bus-bar voltage
DB61
260-325 VDC
Smoothing capacitor
(C63)
(-) (+)
208/230 VAC
Smoothing capacitor
(C62)
Fuse (F801)
T3.15AL250V
Smoothing capacitor
(C61)
Fuse (F701)
T3.15AL250V
R.V. coil
(CN721)
208/230 VAC
Fuse (F901)
T3.15AL250V
Output to drive compressor
(LDU,
LDV,
LDW)
208/230 VAC
LED LEV connector
(CN724)
Jumper wire for changing defrost setting (JS)
Jumper wire for pre-heat control setting
(JK)
Front side of unit
Fin temperature thermistor /R
Defrost thermistor /R
Output to drive outdoor fan motor (CN932)
Outdoor heat exchanger temperature thermistor /R
Ambient temperature thermistor /R
Discharge temperature thermistor /R
60
50
40
30
100
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
90
80
70
700
Discharge temperature thermistor(RT62)
600
500
400
300
20
10
0
-4 14 32 50 68 86 104
Temperature(°F)
200
100
0
32 50 68 86 104 122 140 158 176 194 212 230 248
Temperature(°F)
34
200
Fin temperature thermistor(RT64)
180
160
140
120
100
80
60
40
20
0
32 50 68 86 104 122 140 158 176
Temperature(°F)
MUZ-FE18NA Fuse (F62)
T2.0AL250V
Fuse (F601)
T3.15AL250V
R.V. coil (CN602)
208/230 VAC
Signal of outdoor fan motor
(CN931)
LED
Output to drive outdoor fan motor
(CN932)
Fuse (F901)
T3.15AL250V
Fuse (F880)
T3.15AL250V
Jumper wire for changing defrost setting (JS)
Jumper wire for pre-heat control setting (JK)
Defrost thermistor
/RT61 (CN671)
Discharge temperature thermistor/RT62
(CN671)
Outdoor heat exchanger temperature thermistor
/RT68 (CN671)
Ambient temperature thermistor/RT65
(CN672)
Fin temperature thermistor/RT64
(CN673)
LEV connector (CN724)
50
40
30
20
100
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
90
80
70
60
700
600
500
JP715 (+)
Bus-bar voltage
325 - 370 VDC
JP30 (-)
Discharge temperature thermistor(RT62)
200
Fin temperature thermistor(RT64)
180
160
140
120
100
400
300
200
100
80
60
40
20 10
0
-4 14 32 50 68 86 104
Temperature(°F)
0
32 50 68 86 104 122 140 158 176 194 212 230 248
Temperature(°F)
0
32 50 68 86 104 122 140 158 176
Temperature(°F)
35
11 DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
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.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector has the
locking mechanism.
Sleeve
Locking lever
Slide the sleeve.
Pull the terminal while pushing the locking lever.
Hold the sleeve, and pull out the terminal slowly.
Connector
11-1. MUZ-FE09NA MUZ-FE12NA
OPERATING PROCEDURE
1. Removing the cabinet
(1) Remove the screw fixing the service panel. (Photo 1)
(2) Pull down the service panel and remove it. (Photo 1)
(3) Remove the screws fixing the conduit cover. (Photo 2)
(4) Remove the conduit cover. (Photo 2)
(5) Disconnect the power supply wire and indoor/outdoor connecting wire.
(6) Remove the screws fixing the top panel. (Photo 1)
(7) Remove the top panel. (Photo 1)
(8) Remove the screws fixing the cabinet.
(9) Remove the cabinet.
(10) Remove the screws fixing the back panel.
(11) Remove the back panel.
NOTE: Turn OFF power supply before disassembling.
PHOTOS
Photo 1
Screws of the top panel
Screw of the cabinet
Screws of the top panel
Back panel
Screw of the service panel
Photo 2
Hooks
Conduit cover
Screw of the conduit cover
Screws of the cabinet
Conduit plate
Service panel
36
OPERATING PROCEDURE
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following connectors:
<Inverter P.C. board>
CN721 (R.V.coil)
CN932 (Fan motor)
CN641 (Defrost thermistor and discharge temperature thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector (CN61).
(4) Remove the screws fixing the relay panel. (Photo 3)
(5) Remove the inverter assembly. (Photo 4)
(6) Remove the screw of the ground wire and screw of the
T.B.support. (Photo 4)
(7) Remove the inverter P.C. board from the inverter assembly.
Photo 3
PHOTOS
Screws of the relay panel
Photo 4 (Inverter assembly)
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Remove the R.V. coil. (Photo 5)
Heat sink
Inverter
P.C. board
Screw of the
T.B.support
T.B.support
4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor.
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following connectors:
<Inverter P.C. board>
CN721 (R.V.coil)
CN932 (Fan motor)
CN641 (Defrost thermistor and discharge temperature thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder. (Photo 5)
(4) Pull out the defrost thermistor from its holder. (Photo 6)
(5) Pull out the outdoor heat exchanger temperature thermistor from its holder. (Photo 6)
(6) Pull out the ambient temperature thermistor from its holder.
Photo 5
Screw of the ground wire
R.V. coil
37
Discharge temperature thermistor
OPERATING PROCEDURE
5. Removing outdoor fan motor
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the connectors for outdoor fan motor.
(3) Remove the propeller nut. (Photo 7)
(4) Remove the propeller. (Photo 7)
(5) Remove the screws fixing the fan motor. (Photo 7)
(6) Remove the fan motor.
Photo 6
PHOTOS
Outdoor heat exchanger temperature thermistor
6. Removing the compressor and 4-way valve
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Remove the inverter assembly. (Refer to 2.)
(3) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG.
(4) Detach the brazed part of the suction and the discharge pipes connected with compressor.
(5) Remove the nuts of compressor legs.
(6) Remove the compressor.
(7) Detach the brazed part of pipes connected with 4-way valve. (Photo 8)
Photo 8
Defrost thermistor
Photo 7
Screws of the outdoor fan motor
Brazed parts of 4-way valve
Propeller Propeller nut
38
11-2. MUZ-FE18NA
OPERATING PROCEDURE
1. Removing the cabinet
(1) Remove the screws of the service panel.
(2) Remove the screws of the top panel.
(3) Remove the screw of the valve cover.
(4) Remove the service panel.
(5) Remove the screws fixing the conduit cover. (Photo 3)
(6) Remove the conduit cover. (Photo 3)
(7) Remove the top panel.
(8) Remove the valve cover.
(9) Disconnect the power supply and indoor/outdoor connecting wire.
(10) Remove the screws of the cabinet.
(11) Remove the cabinet.
(12) Remove the screws of the back panel.
(13) Remove the back panel.
Photo 2 Screws of the top panel
Screws of the back panel
Screws of the back panel
Screws of the back panel
NOTE: Turn OFF power supply before disassembling.
PHOTOS
Photo 1
Screws of the top panel
Screws of the cabinet
Screws of the cabinet
Photo 3
Screws of the conduit cover
Conduit plate
Screws of the cabinet
Screws of the back panel
Screws of the back panel
Screws of the service panel
Screw of the valve cover
39
OPERATING PROCEDURE
2. Removing the inverter assembly, inverter P.C. board
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following connectors:
<Inverter P.C. board>
CN602 (R.V. coil)
CN931, CN932 (Fan motor)
CN671 (Defrost thermistor, discharge temperature thermistor and outdoor heat exchanger temperature thermistor)
CN672 (Ambient temperature thermistor)
CN724 (LEV)
(3) Remove the compressor connector.
(4) Remove the screws fixing the relay panel.
(5) Remove the relay panel.
(6) Remove the earth wires and the lead wires of the inverter P.C. board.
(7) Remove the screw of the PB support.
(8) Remove the inverter P.C. board from the relay panel.
Photo 4
Inverter P.C board
Screws of the PB support
PHOTOS
Screw of the relay panel
Earth wires
Screws of the
PB support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connector:
<Inverter P.C. board>
CN602 (R.V. coil)
(3) Remove the R.V. coil.
Photo 5
Screws of the relay panel
Screw of the
R.V. coil
Brazed parts of
4-way valve
40
OPERATING PROCEDURE
4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the lead wire to the reactor and the following connectors:
<Inverter P.C. board>
CN671 (Defrost thermistor, discharge temperature thermistor and outdoor heart exchanger temperature thermistor)
CN672 (Ambient temperature thermistor)
(3) Pull out the discharge temperature thermistor from its holder.
(Photo 8)
(4) Pull out the defrost thermistor from its holder.
(5) Pull out the outdoor heat exchanger temperature thermistor from its holder.
(6) Pull out the ambient temperature thermistor from its holder.
PHOTOS
Photo 6
Outdoor heat exchanger temperature thermistor
Ambient temperature thermistor
5. Removing outdoor fan motor
(1) Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931 and CN932 (Fan motor)
(3) Remove the propeller.
(4) Remove the screws fixing the fan motor.
(5) Remove the fan motor.
Photo 7
Defrost thermistor
6. Removing the compressor and 4-way valve
(1) Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Remove the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm 2 (0 MPa).
(5) Detach the brazed part of the suction and the discharge pipes connected with compressor.
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the brazed parts of 4-way valve and pipes. (Photo 5)
Screws of the outdoor fan motor
Photo 8
Brazed part of the discharge pipe
Discharge temperature thermistor
Brazed part of the suction pipe
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HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2009 MITSUBISHI ELECTRIC CO.,LTD
Distributed in Sep. 2010. No. OBH543 REVISED EDITION-A 5
Distributed in Jul. 2009. No. OBH543 5
Made in Japan
New publication, effective Sep. 2010
Specifications subject to change without notice.
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