SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
HFC
No. OBH549
utilized
SERVICE MANUAL
R410A
Models
MUZ-GE09NA
MUZ-GE12NA
MUZ-GE15NA
MUZ-GE18NA
MUY-GE09NA
MUY-GE12NA
MUY-GE15NA
MUY-GE18NA
Indoor unit service manual
MSZ-GE•NA MSY-GE•NA Series (OBH548)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM············································ 8
6. REFRIGERANT SYSTEM DIAGRAM··············11
7. DATA································································ 13
8. ACTUATOR CONTROL··································· 22
9. SERVICE FUNCTIONS ··································· 23
10. TROUBLESHOOTING····································· 23
11. DISASSEMBLY INSTRUCTIONS···················· 40
PARTS CATALOG (OBB549)
TM
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
2
PART NAMES AND FUNCTIONS
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA
MUY-GE09NA MUY-GE12NA MUY-GE15NA
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
MUZ-GE18NA MUY-GE18NA
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
3
3
SPECIFICATION
Outdoor unit model
MUZ-GE09NA
MUY-GE09NA
MUZ-GE12NA
MUY-GE12NA
9,000
9,000
12,000
12,000
Cooling
1
Btu/h
Btu/h
( 3,800 ~ 12,200 ) ( 3,800 ~ 12,200 ) ( 3,800 ~ 13,600 ) ( 3,800 ~ 13,600 )
Capacity
Rated (Minimum~Maximum)
10,900
( 4,500 ~ 14,100 )
8,700
660 (205~1,200)
760 (255~1,200)
950
14,400
( 5,500 ~ 18,100 )
11,200
960 (205~1,300)
1,170 (340~1,660)
1,200
Heating 47
Heating 17
Cooling
Heating 47
1
2
—
—
Capacity
Btu/h
W
W
—
—
1
660 (205~1,200)
960 (205~1,300)
Power consumption
Rated (Minimum~Maximum)
1
2
—
—
—
—
Power consumption Heating 17
W
1
EER
[SEER]
3
Cooling
Heating
Heating
13.6 [ 21.0 ]
10.0
13.6 [ 21.0 ]
12.5 [ 20.5 ]
10.0
12.5 [ 20.5 ]
HSPF IV
COP
4
—
—
—
—
1
4.20
3.61
Power supply
V , phase , Hz
208/230 , 1 , 60
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
A
A
F.L.A
15
12
12
12
12
0.50
Model
KNB073FQDHC
KNB092FQAHC
R.L.A
L.R.A
6.6
8.2
4.9
6.1
6.6
8.2
4.9
6.1
Compressor
Refrigeration oil cc. (Model)
320 (NEO22)
Refrigerant control
Linear expansion valve
Cooling
Heating
dB(A)
dB(A)
46
50
46
—
49
51
49
—
Sound level
1
Defrost method
Dimensions
Reverse cycle
31-1/2
W
D
H
in.
in.
in.
Ib.
11-1/4
21-5/8
Weight
66
77
External finish
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Munsell 3Y 7.8/1.1
Wireless type
12 - 24
VDC
Not supplied
1/4 (0.0315)
3/8 (0.0315)
Flared
Liquid
Gas
Indoor
Outdoor
in.
in.
Refrigerant pipe size
(Min. wall thickness)
Connection method
Flared
Height difference ft.
40
65
Between the indoor &
outdoor units
Piping length
ft.
Refrigerant charge (R410A)
NOTE: Test conditions are based on ARI 210/240.
1 lb. 12 oz.
2 lb. 9 oz.
1: Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB) Rated frequency
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB
Rated frequency
Maximum frequency
2:
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB
4
Outdoor unit model
MUZ-GE15NA
MUY-GE15NA
MUZ-GE18NA
MUY-GE18NA
14,000
14,000
17,200
17,200
Cooling
1
Btu/h
Btu/h
( 3,100 ~ 18,200 ) ( 3,100 ~ 18,200 ) ( 3,700 ~ 18,700 ) ( 3,700 ~ 18,700 )
Capacity
Rated (Minimum~Maximum)
18,000
( 4,800 ~ 20,900 )
21,600
( 3,500 ~ 25,200 )
Heating 47
Heating 17
1
2
—
—
Capacity
Btu/h
W
15,900
—
17,200
—
Cooling
1
1,080 (160 ~ 2,000) 1,080 (160 ~ 2,000) 1,640 (240 ~ 2,070) 1,640 (240 ~ 2,070)
Power consumption
Rated (Minimum~Maximum)
Heating 47
1
2
W
W
1,600 (270 ~ 2,010)
1,950
—
—
1,900 (230 ~ 2,680)
2,080
—
Power consumption Heating 17
—
10.5 [19.2]
—
1
EER
[SEER]
3
Cooling
Heating
Heating
13.0 [ 21.0 ]
10.0
13.0 [ 21.0 ]
10.5 [19.2]
10.0
HSPF IV
COP
4
—
—
1
3.30
3.33
—
Power supply
V , phase , Hz
208/230 , 1 , 60
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
A
A
F.L.A
15
12
0.50
14
0.93
Model
SNB130FQBH
R.L.A
L.R.A
7.4
9.3
6.8
8.5
10.0
12.5
10.0
12.5
Compressor
Refrigeration oil cc. (Model)
450 (NEO22)
Refrigerant control
Linear expansion valve
Cooling
Heating
dB(A)
dB(A)
49
51
49
—
54
56
54
—
Sound level
1
Defrost method
Dimensions
Reverse cycle
W
D
H
in.
in.
in.
Ib.
31-1/2
11-1/4
21-5/8
80
33-1/16
13
33-7/16
119
Weight
External finish
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Munsell 3Y 7.8/1.1
Wireless type
12 - 24
VDC
Not supplied
1/4 (0.0315)
1/2 (0.0315)
Flared
Liquid
Gas
Indoor
Outdoor
in.
in.
Refrigerant pipe size
(Min. wall thickness)
Connection method
Flared
Height difference ft.
40
65
50
100
Between the indoor &
outdoor units
Piping length
ft.
Refrigerant charge (R410A)
NOTE: Test conditions are based on ARI 210/240.
2 lb. 9 oz.
3 lb. 7 oz.
1: Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB) Rated frequency
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB
Rated frequency
Maximum frequency
2:
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB
5
Test condition
3, 4
Indoor air condition (°F)
Outdoor air condition (°F)
Mode
ARI
Test
Dry bulb
Wet bulb
Dry bulb
Wet bulb
"A-2" Cooling Steady State
at rated compressor Speed
80
67
95
(75)
"B-2" Cooling Steady State
at rated compressor Speed
80
80
80
80
70
70
70
70
70
67
67
67
67
60
60
60
60
60
82
82
67
87
47
17
62
47
35
(65)
(65)
(53.5)
(69)
43
SEER "B-1" Cooling Steady State
(Cooling) 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
15
HSPF
(Heating)
(MUZ)
"H0-1" Heating Steady State
at minimum compressor Speed
56.5
43
"H1-1" Heating Steady State
at minimum compressor Speed
"H2-V" Heating
at Intermediate compressor Speed
33
5
5: At Intermediate compressor Speed
= ("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage
Guaranteed voltage (V)
208/230 V
1 phase
60 Hz
Min. 187
208
230 Max. 253
Outdoor unit
(2) OPERATION
Intake air temperature (°F)
Mode
Condition
Standard temperature
Maximum temperature
Minimum temperature
Maximum humidity
Indoor
78 %
Outdoor
DB
80
90
67
WB
67
73
DB
95
115
14
WB
—
—
Cooling
57
—
—
Standard temperature
Maximum temperature
Minimum temperature
70
80
70
60
67
60
47
75
-4
43
65
-5
Heating
(MUZ)
6
4
OUTLINES AND DIMENSIONS
Unit: inch
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA
MUY-GE09NA MUY-GE12NA MUY-GE15NA
REQUIRED SPACE
Basically open 4 inch or more
without any obstruction in front
and on both sides of the unit.
15-3/4
Drain hole 1-5/8
Air in
Air in
1-9/16
Air out
2- 3/8 13/16 Oval hole
29/32
11-1/4
17/32
7/8
Open two sides of left,
right, or rear side.
handle
Liquid pipe :1/4 (flared)
Gas pipe :3/8 (flared) (GE09/12)
1/2 (flared) (GE15)
11-29/32
6-23/32
5-15/16
19-11/16
31-1/2
2-23/32
MUZ-GE18NA MUY-GE18NA
Open as a rule
20 inch or more if
the front and both
sides are open
REQUIRED SPACE
20-9/32
4 inch or more/
Drain 3 holes
8 inch or more if
there are obstacles
to both sides
11-25/32
(ø1-5/16)
1-9/16
Air in
2-19/32
Air in
4-3/8
×
13/16 slot
Air out
19-11/16
Open as a rule
20 inch or more if the back,
both sides and top are open
3-3/16
33-1/16
4-25/32
3 0 °
Liquid:1/4(flared)
Gas :1/2(flared)
3 5 °
8-11/32
7
5
WIRING DIAGRAM
MUZ-GE09NA MUZ-GE12NA
MUY-GE09NA MUY-GE12NA
8
MUZ-GE15NA
MUY-GE15NA
9
MUZ-GE18NA
MUY-GE18NA
10
6
REFRIGERANT SYSTEM DIAGRAM
Unit: inch
MUZ-GE09NA MUY-GE09NA
Refrigerant pipe ø3/8
(with heat insulator)
4-way valve
Muffler
Outdoor heat
exchanger
temperature
thermistor
RT68
Stop valve
(with service port)
Outdoor
heat
exchanger
Muffler
Discharge
temperature
thermistor
RT62
Flared connection
Service port
Compressor
Ambient
temperature
thermistor
RT65
Service port
Defrost
thermistor
RT61
(MUZ)
Strainer
Capillary tube
#100
O.D. 0.118 × I.D. 0.079
Flared connection
× 9-7/16
(ø3.0 × ø2.0 × 240)
LEV
R.V. coil (MUZ)
heating ON
cooling OFF
Stop valve
(with strainar)
Refrigerant pipe ø1/4
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating (MUZ)
Unit: inch
MUZ-GE12NA MUZ-GE15NA MUY-GE12NA MUY-GE15NA
Refrigerant pipe ø3/8 (GE12NA)
4-way valve
Refrigerant pipe ø1/2 (GE15NA)
(with heat insulator)
Muffler
Outdoor heat
exchanger
Stop valve
temperature
(with service port)
thermistor
RT68
Outdoor
heat
exchanger
Muffler
Discharge
temperature
thermistor
RT62
Flared connection
Service port
Compressor
Ambient
temperature
thermistor
RT65
Service port
Defrost
thermistor
RT61
(MUZ)
Capillary tube
O.D. 0.118 × I.D. 0.071
× 23-5/8
Strainer
Capillary tube
(ø3.0 × ø1.8
×
600) (×2)
#100
O.D. 0.118 × I.D. 0.079
Flared connection
LEV
× 9-7/16
(ø3.0 × ø2.0 × 240)
R.V. coil (MUZ)
heating ON
cooling OFF
Stop valve
(with strainar)
Refrigerant pipe ø1/4
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating (MUZ)
11
Unit: inch
MUZ-GE18NA MUY-GE18NA
Muffler
#100
Refrigerant pipe ø1/2
(with heat insulator)
4-way valve
Stop valve
(with service port)
Service port
Outdoor
heat
Flared connection
Discharge
temperature
thermistor
RT62
Ambient
Defrost
exchanger
temperature
thermistor
RT65
thermistor
RT61
Service port
(MUZ)
Compressor
Outdoor heat
exchanger
temperature
thermistor
RT68
Flared connection
LEV
Strainer
#100
R.V. coil (MUZ)
heating ON
cooling OFF
Receiver
Stop valve
(with strainar)
Capillary tube
O.D. 0.142 × I.D. 0.094
Refrigerant pipe
ø1/4
Refrigerant flow in cooling
Refrigerant flow in heating (MUZ)
× 1-31/32
(ø3.6
(with heat insulator)
×ø2.4×50)
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Refrigerant piping: ft.
Piping size O.D: in.
Model
Max. Length
Max. Height difference
B
Gas
Liquid
1/4
A
MUZ-GE09/12/15NA
MUY-GE09/12/15NA
3/8 (GE09/12)
1/2 (GE15)
65
40
50
MUZ-GE18NA
MUY-GE18NA
100
1/2
Indoor
unit
Max. Height
difference
B
Max. Length
A
Outdoor unit
12
ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)
Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
Refrigerant piping length (one way): ft.
Outdoor unit
precharged
Model
25
0
30
40
50
60
65
MUZ-GE09NA
MUY-GE09NA
MUZ-GE12NA
MUY-GE12NA
MUZ-GE15NA
MUY-GE15NA
1 lb. 12 oz.
1.62
4.86
8.10
11.34
12.96
2 lb. 9 oz.
Calculation: X oz. = 1.62/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
Refrigerant piping length (one way): ft.
Outdoor unit
precharged
Model
25
0
30
40
50
60
70
80
90
100
MUZ-GE18NA
MUY-GE18NA
3 lb. 7 oz.
1.08
3.24
5.40
7.56
9.72
11.88
14.04
16.20
Calculation: X oz. = 1.08/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
7 DATA
7-1. PERFORMANCE DATA
1) COOLING CAPACITY
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA
MUY-GE09NA MUY-GE12VA MUY-GE15VA MUY-GE18VA
Indoor air
Outdoor intake air DB temperature (˚F)
85 95 105
TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC
Model
75
115
IWB (˚F)
71
67
63
71
67
63
71
67
63
71
67
63
11.0 7.6 0.59 10.3 7.1 0.64 9.7
6.6 0.69 9.0
7.4 0.66 8.4
8.1 0.63 7.7
6.2 0.73 8.3
6.9 0.70 7.7
7.3 0.67 7.0
5.7 0.76
6.3 0.73
6.7 0.70
MUZ-GE09NA
MUY-GE09NA
10.4 8.6 0.55 9.7
9.8 9.4 0.53 9.1
8.0 0.61 9.0
8.7 0.58 8.5
14.7 8.9 0.85 13.7 8.3 0.94 12.9 7.8 1.01 12.0 7.3 1.06 11.0 6.7 1.10
13.9 10.3 0.81 13.0 9.6 0.89 12.0 8.9 0.96 11.2 8.3 1.02 10.3 7.6 1.07
13.1 11.4 0.77 12.1 10.6 0.85 11.3 9.9 0.92 10.3 9.0 0.98 9.4
17.2 11.4 0.96 16.0 10.7 1.05 15.1 10.0 1.13 14.0 9.3 1.19 12.9 8.6 1.24
16.2 13.0 0.91 15.1 12.1 1.00 14.0 11.2 1.08 13.0 10.4 1.14 12.0 9.6 1.20
15.3 14.2 0.86 14.1 13.2 0.96 13.2 12.3 1.03 12.0 11.2 1.10 10.9 10.2 1.14
21.1 12.2 1.46 19.7 11.4 1.60 18.5 10.7 1.72 17.2 9.9 1.81 15.8 9.1 1.89
20.0 14.2 1.38 18.6 13.2 1.52 17.2 12.2 1.64 16.0 11.4 1.74 14.7 10.4 1.82
18.7 15.8 1.31 17.4 14.7 1.45 16.2 13.6 1.57 14.7 12.4 1.67 13.4 11.3 1.74
MUZ-GE12NA
MUY-GE12NA
8.2 1.02
MUZ-GE15NA
MUY-GE15NA
MUZ-GE18NA
MUY-GE18NA
NOTE: 1. IWB: Intake air wet-bulb temperature
TC: Total Capacity (×103 Btu/h)
SHC: Sensible Heat Capacity (×103 Btu/h)
TPC: Total Power Consumption (kW)
2. SHC is based on 80˚F of indoor Intake air DB temperature.
13
2) COOLING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.)
40
65
MUZ-GE09NA
MUY-GE09NA
MUZ-GE12NA
MUY-GE12NA
MUZ-GE15NA
MUY-GE15NA
MUZ-GE18NA
MUY-GE18NA
1.0
0.954
0.878
3) HEATING CAPACITY (MUZ)
Indoor air
Outdoor intake air WB temperature (˚F)
Model
5
15
25
35
43
45
55
IDB (˚F)
TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC
4.8 0.45 6.3 0.57 7.9 0.67 9.4 0.74 10.6 0.78 11.0 0.79 12.4 0.82
5.2 0.43 6.7 0.55 8.2 0.65 9.6 0.72 10.9 0.76 11.2 0.78 12.7 0.81
5.5 0.41 6.9 0.52 8.6 0.63 10.0 0.70 11.2 0.74 11.6 0.75 13.0 0.79
6.3 0.69 8.4 0.87 10.4 1.02 12.5 1.14 14.0 1.20 14.5 1.22 16.4 1.26
6.8 0.66 8.9 0.84 10.8 1.00 12.7 1.11 14.4 1.17 14.8 1.19 16.8 1.24
7.2 0.63 9.1 0.81 11.3 0.97 13.2 1.08 14.8 1.14 15.3 1.16 17.1 1.22
7.9 0.63 10.4 0.79 13.1 0.93 1.56 1.03 17.6 1.09 18.1 1.10 20.5 1.14
8.6 0.60 11.1 0.76 13.5 0.91 15.9 1.01 18.0 1.06 18.5 1.08 21.0 1.12
9.0 0.57 11.3 0.73 14.1 0.87 16.5 0.98 18.5 1.03 19.1 1.05 21.4 1.10
9.1 0.64 11.9 0.81 14.9 0.95 17.8 1.06 20.1 1.12 20.7 1.13 23.5 1.18
9.8 0.62 12.7 0.78 15.5 0.93 18.2 1.04 20.6 1.09 21.2 1.11 24.0 1.16
10.3 0.59 13.0 0.75 16.2 0.90 18.8 1.01 21.2 1.06 21.8 1.08 24.5 1.13
75
70
65
75
70
65
75
70
65
75
70
65
MUZ-GE09NA
MUZ-GE12NA
MUZ-GE15NA
MUZ-GE18NA
NOTE: 1. IDB: Intake air dry-bulb temperature
TC: Total Capacity (x103 Btu/h)
TPC: Total Power Consumption (kW)
2. Above data is for heating operation without any frost.
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.
7-2. PERFORMANCE CURVE
Cooling
MUZ-GE09NA
MUY-GE09NA
MUZ-GE12NA
MUY-GE12NA
MUZ-GE15NA
MUY-GE15NA
SHF at rating condition = 0.76
SHF at rating condition = 0.73
SHF at rating condition = 0.80
= 307 CFM
= 350 CFM
= 498 CFM
Airflow
Airflow
Airflow
18
17
16
15
14
13
12
11
Indoor intak
15
14
13
13
12
11
10
9
Ind
oor intake air WB temperature (°F)
e air WB temperature (°F)
Indoor
12
11
10
9
intake air WB te
mperat
71
71
67
63
71
67
63
67
63
8
ure (°F)
7
1.2
1.1
1.0
0.9
0.8
0.7
1.3
1.2
1.1
1.0
0.9
0.8
71
67
63
)
71
67
63
rature (°F)
rature (°F
WB tempe
0.7
0.6
0.5
71
67
63
intake air WB tempe
Indoor
75
intake air
(°F)
ure
Indoor
75
rat
e air WB tempe
Indoor intak
75 85
65
85
95
105
115
65
85
95
105
115
65
95
105
115
Outdoor intake air DB temperature (°F)
Outdoor intake air DB temperature (°F)
Outdoor intake air DB temperature (°F)
14
MUZ-GE18NA
MUY-GE18NA
SHF at rating condition = 0.71
= 498 CFM
Airflow
22
21
20
19
18
17
16
15
14
Indoor intake air WB te
mperat
71
67
ure (°F)
63
1.9
1.8
1.7
1.6
1.5
1.4
1.3
71
67
63
rature (°F)
mpe
Indoor intake air WB te
65
75
85
95
105
115
Outdoor intake air DB temperature (°F)
Heating (MUZ)
MUZ-GE09NA
MUZ-GE12NA
= 413 CFM
= 413 CFM
Airflow
Airflow
15
14
13
12
65
70
75
20
16
12
8
65
70
75
11
10
9
8
7
4
6
5
75
70
65
1.0
0.8
0.6
0.4
1.3
1.2
1.1
75
70
65
1.0
0.9
0.8
0.7
0.6
0.5
5
15
25
35
45
55
65
70
5
15
25
35
45
55
65
70
Outdoor intake air WB temperature (°F)
Outdoor intake air WB temperature (°F)
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.
MUZ-GE18NA
MUZ-GE15NA
= 463 CFM
= 463 CFM
Airflow
Airflow
25
30
28
26
24
65
70
75
65
70
75
23
21
19
17
15
13
22
20
18
11
9
16
14
7
5
12
10
75
70
65
75
70
65
2.1
1.8
1.5
1.2
0.9
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.6
0.5
5
15
25
35
45
55
65
70
5
15
25
35
45
55
65
70
Outdoor intake air WB temperature (°F)
Outdoor intake air WB temperature (°F)
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.
15
7-3. CONDENSING PRESSURE
Cooling
Data is based on the condition of indoor humidity 50 %.
Air flow should be set to High speed.
MUZ-GE09NA MUY-GE09NA
(PSIG)
440
(PSIG)
200
86
86
80
75
70
400
360
320
280
80
75
70
180
160
140
120
95
Outdoor ambient temperature
6870
75
80
85
90
100 105(°F)
6870
75
80
85
90
95
100 105(°F)
Outdoor ambient temperature
MUZ-GE12NA MUY-GE12NA
(PSIG)
420
(PSIG)
190
86
80
75
70
86
80
380
340
300
260
170
150
130
110
75
70
95
Outdoor ambient temperature
6870
75
80
85
90
100 105(°F)
95
Outdoor ambient temperature
6870
75
80
85
90
100 105(°F)
MUZ-GE15NA MUY-GE15NA
(PSIG)
440
(PSIG)
200
86
80
75
70
86
80
400
360
320
280
180
160
140
120
75
70
95
Outdoor ambient temperature
6870
75
80
85
90
100 105(°F)
6870
75
80
85
90
95
100 105(°F)
Outdoor ambient temperature
16
MUZ-GE18NA MUY-GE18NA
(PSIG)
430
(PSIG)
160
86
80
75
70
86
80
390
350
310
270
145
130
115
100
75
70
95
Outdoor ambient temperature
95
Outdoor ambient temperature
6870
75
80
85
90
100 105(°F)
6870
75
80
85
90
100 105(°F)
Heating (MUZ)
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-GE09NA
(PSIG)
(PSIG)
370
210
185
160
135
110
85
75
70
65
75
70
65
345
320
295
270
245
58Hz
58Hz
220
5
60
15
25
35
45
55
65 75(°F)
5
15
25
35
45
55
65 75(°F)
Outdoor ambient temperature
Outdoor ambient temperature
MUZ-GE12NA
(PSIG)
(PSIG)
210
460
75
70
65
185
160
135
110
85
75
70
65
420
380
340
300
58Hz
58Hz
260
5
60
15
25
35
45
55
65 75(°F)
5
15
25
35
45
55
65 75(°F)
Outdoor ambient temperature
Outdoor ambient temperature
17
MUZ-GE15NA
(PSIG)
440
(PSIG)
210
75
70
65
75
70
65
185
160
135
110
85
404
368
332
296
54Hz
54Hz
260
5
60
15
25
35
45
55
65 75(°F)
5
15
25
35
45
55
65 75(°F)
Outdoor ambient temperature
Outdoor ambient temperature
MUZ-GE18NA
(PSIG)
500
(PSIG)
210
75
70
65
75
70
65
475
450
425
400
375
350
325
185
160
135
110
85
58Hz
58Hz
300
5
60
15
25
35
45
55
65 75(°F)
5
15
25
35
45
55
65 75(°F)
Outdoor ambient temperature
Outdoor ambient temperature
18
7-4. STANDARD OPERATION DATA
MSZ-GE09NA
MSY-GE09NA
MSZ-GE12NA
MSY-GE12NA
Model
MSZ-GE09NA
MSZ-GE12NA
Item
Unit
Cooling
9,000
0.82
Heating
10,900
—
Cooling
12,000
0.74
Heating
14,400
—
Capacity
SHF
Btu/h
-
Input
kW
Hz
0.660
59.5
0.760
77.5
0.960
69.0
1.170
77.0
Rated frequency
Indoor unit
MSZ-GE09NA, MSY-GE09NA
208 / 230, 1, 60
0.023
MSZ-GE12NA, MSY-GE12NA
Power supply (V, Phase, Hz)
Input
kW
A
0.022
0.022
0.023
Fan motor current
0.24/0.22
0.25/0.23
0.24/0.22
0.25/0.23
MUZ-GE09NA
MUY-GE09NA
MUZ-GE12NA
MUY-GE12NA
Outdoor unit
MUZ-GE09NA
MUZ-GE12NA
Power supply (V, phase, Hz)
Input
208/230, 1, 60
kW
A
0.638
3.32/3.00
0.27/0.24
389
0.737
3.66/3.31
0.30/0.27
331
0.938
4.39/3.97
0.34/0.31
389
1.147
5.41/4.89
0.31/0.28
397
Comp. current
Fan motor current
A
Condensing pressure
Suction pressure
PSIG
PSIG
°F
151
103
133
104
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp
Ref. pipe length
154
152
163
162
°F
115
103
115
116
°F
59
39
56
35
°F
151
149
158
158
ft.
25
Refrigerant charge (R410A)
-
1 lb. 12 oz.
2 lb. 9 oz.
DB
WB
DB
WB
°F
80
67
70
60
80
67
70
60
Intake air temperature
°F
°F
60
97
56
108
—
Discharge air temperature
°F
58
—
55
Fan speed (High)
rpm
CFM
°F
1,020
367 (Wet)
95
1,040
413
47
1,020
367 (Wet)
95
1,040
413
47
Airflow (High)
DB
Intake air temperature
WB
°F
—
43
—
43
Fan speed
rpm
CFM
800
850
1225
900
860
1172
Airflow
1151
1229
19
MSZ-GE15NA
MSY-GE15NA
MSZ-GE18NA
MSY-GE18NA
Model
Item
MSZ-GE15NA
MSZ-GE18NA
Unit
Btu/h
-
Cooling
14,000
0.80
Heating
18,000
—
Cooling
17,200
0.71
Heating
21,600
—
Capacity
SHF
Input
kW
Hz
1.080
55.5
1.600
74.0
1.640
83.0
1.900
84.0
Rated frequency
Indoor unit
MSZ-GE15NA, MSY-GE15NA
208/230, 1, 60
0.031
MSZ-GE18NA, MSY-GE18NA
Power supply (V, Phase, Hz)
Input
kW
A
0.045
0.043
0.037
Fan motor current
0.50/0.45
0.35/0.32
0.43/0.39
0.40/0.36
MUZ-GE15NA
MUY-GE15NA
MUZ-GE18NA
MUY-GE18NA
Outdoor unit
MUZ-GE15NA
MUZ-GE18NA
Power supply (V, phase, Hz)
Input
208/ 230, 1, 60
kW
A
1,035
4.86/4.40
0.33/0.30
400
1,569
7.38/6.67
0.34/0.31
431
1,595
6.97/6.29
0.80/0.72
376
1,860
8.36/7.55
0.64/0.59
458
Comp. current
Fan motor current
A
Condensing pressure
Suction pressure
PSIG
PSIG
°F
139
99
117
102
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp
Ref. pipe length
164
179
177
184
°F
117
122
112
127
°F
57
31
59
33
°F
148
165
164
170
ft.
25
Refrigerant charge (R410A)
-
2 lb. 9 oz.
3 lb. 7 oz.
DB
WB
DB
WB
°F
80
67
70
60
80
67
70
60
Intake air temperature
°F
°F
60
114
—
56
117
—
Discharge air temperature
°F
57
54
Fan speed (High)
rpm
CFM
°F
1,280
498 (Wet)
95
1,140
463
47
1,280
498 (Wet)
95
1,240
512
47
Airflow (High)
DB
Intake air temperature
WB
°F
—
43
—
43
Fan speed
rpm
CFM
910
900
1,229
780
740
1,659
Airflow
1,243
1,730
20
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
MUZ-GE09NA
MUY-GE09NA
MUZ-GE09NA
Correction of Cooling capacity
Correction of Cooling total input
Correction of Heating total input
Correction of Heating capacity
2.0
1.5
2.0
1.5
1.5
1.0
0.5
2.0
1.5
1.0
0.5
1.0
0.5
1.0
0.5
(Hz)
150
(Hz)
150
(Hz)
(Hz)
150
0
50
100
0
50
100
150
0
50
100
0
50
100
The operational frequency of compressor
The operational frequency of compressor The operational frequency of compressor
The operational frequency of compressor
MUZ-GE12NA
MUY-GE12NA
MUZ-GE12NA
Correction of Cooling capacity
1.5
Correction of Cooling total input
Correction of Heating capacity
Correction of Heating total input
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
1.0
0.5
(Hz)
150
(Hz)
150
(Hz)
(Hz)
150
0
50
100
0
50
100
150
0
50
100
0
50
100
The operational frequency of compressor
The operational frequency of compressor The operational frequency of compressor
The operational frequency of compressor
MUZ-GE15NA
MUY-GE15NA
MUZ-GE15NA
Correction of Cooling capacity
2.0
Correction of Cooling total input
Correction of Heating capacity
Correction of Heating total input
1.5
1.0
0.5
2.0
1.5
1.5
1.5
1.0
0.5
1.0
0.5
1.0
0.5
(Hz)
150
(Hz)
150
(Hz)
(Hz)
0
50
100
0
50
100
150
0
50
100
150
0
50
100
The operational frequency of compressor
The operational frequency of compressor The operational frequency of compressor
The operational frequency of compressor
MUZ-GE18NA
MUY-GE18NA
MUZ-GE18NA
Correction of Cooling capacity
1.5
Correction of Cooling total input
Correction of Heating capacity
Correction of Heating total input
1.5
1.0
0.5
1.5
1.5
1.0
0.5
1.0
0.5
1.0
0.5
(Hz)
150
(Hz)
150
(Hz)
(Hz)
0
50
100
0
50
100
150
0
50
100
150
0
50
100
The operational frequency of compressor
The operational frequency of compressor The operational frequency of compressor
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 var-
ies).
6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on
remote controller.
21
8
ACTUATOR CONTROL
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA
MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA
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 (MUZ)
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
Heating
Cooling
Dry
ON
OFF
OFF
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
<COOL>
<HEAT>
5 seconds
5 seconds
ON
Compressor
R.V.coil
OFF
ON
OFF
ON
Outdoor fan
motor
OFF
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Actuator
Sensor
Purpose
R.V.coil
(MUZ)
Outdoor fan
motor
Indoor fan
motor
Compressor
LEV
Discharge temperature
thermistor
Protection
○ ○
○
Cooling: Coil frost prevention
Indoor coil temperature
thermistor
Heating: High pressure protec-
tion
○ ○
Defrost thermistor (MUZ)
Heating: Defrosting
Protection
○ ○ ○ ○ ○
Fin temperature thermistor
○
○
Ambient temperature
thermistor
Cooling: Low ambient tempera-
ture operation
Cooling: Low ambient tempera-
ture operation
Cooling: High pressure protec-
tion
○ ○ ○
○ ○ ○
○ ○ ○
Outdoor heat exchanger tem-
perature thermistor
22
9
SERVICE FUNCTIONS
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA
MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA
9-1. CHANGE IN DEFROST SETTING (MUZ)
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.)
Defrost finish temperature
Jumper
MUZ-GE09/12/15
MUZ-GE18
Soldered
(Initial setting)
41°F (5°C)
48°F (9°C)
JS
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 tempera-
ture. 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-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA
MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA
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 con-
firming 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.
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 abnormal-
ity. 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.
23
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.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
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
1. Regardless of normal or abnormal condition, a short
beep is emitted once the signal is received.
Does the upper lamp of OPERATION INDICATOR lamp 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 the upper
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnor-
malities that can not be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor
unit failure mode recall function. (Refer to 10-2.2)
No
(OFF)
lamp of OPERATION INDICATOR lamp.
2
Yes
(Blinks)
Judgment of indoor/outdoor abnormality
Before blinking, does the upper lamp of OPERATION INDICA-
TOR lamp stay ON for 3 seconds?
Yes
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
The indoor unit is abnormal.
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table. (Refer to indoor unit service manual.)
Check the blinking pattern, and confirm 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.
2
Make sure to check at least two consecutive blinking cycles.
3
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.
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:
Blinking at 0.5-
second interval
Blinking at 0.5-
second interval
2.5-second OFF
2.5-second OFF
ON
OFF
Beeps
Beeps
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.5-
Blinking at 0.5-
second interval
2.5-second OFF
3-second ON
second interval
2.5-second OFF
3-second ON
ON
OFF
No beep
Beeps
No beep
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
24
2. Flow chart of the detailed outdoor unit failure mode recall function
Operational procedure
The outdoor unit might be abnormal.
Confirm if outdoor unit is abnormal according to the following procedures.
Confirm 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
1. Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
Does the upper lamp of OPERATION INDICATOR
lamp 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 the upper
No
(OFF)
lamp of OPERATION INDICATOR lamp.
2
Yes
(Blinks
)
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the out-
door unit failure mode table (10-2.3.).
The outdoor unit is normal.
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.
Release the failure mode recall function accord-
ing 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" men-
tioned 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:
Blinking at 0.5-
second interval
Blinking at 0.5-
second interval
2.5-second OFF
3-second ON
2.5-second OFF
3-second ON
ON
OFF
No beep
Beeps
No beep
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
25
3. Outdoor unit failure mode table
Indoor/
Outdoor unit
failure mode
recall function
POWER lamp
(Indoor unit)
Abnormal point
LED indication
outdoor unit
failure mode
recall function
Condition
Remedy
(Failure mode / protection) (Outdoor P.C. board)
OFF
None (Normal)
—
—
—
—
—
2-time flash Outdoor power system
2.5 seconds
OFF
Overcurrent protection stop is
•Reconnect connectors.
continuously performed 3 times within •Refer to 10-5. "How
—
1 minute after the compressor gets
started.
to check inverter/
compressor".
•Check stop valve.
○
○
3-time flash Discharge temperature
1-time flash every
Thermistor shorts or opens during
compressor running.
•Refer to 10-5. "Check
of outdoor thermistors".
Defective outdoor
thermistors can be
identified by checking
the blinking pattern of
LED.
2.5 seconds thermistor
2.5 seconds
OFF
Defrost thermistor (MUZ)
Fin temperature thermistor
3-time flash
2.5 seconds OFF
○
○
P.C. board temperature
thermistor
4-time flash
2.5 seconds OFF
Ambient temperature
thermistor
2-time flash
2.5 seconds OFF
4-time flash Overcurrent
2.5 seconds
OFF
11-time flash
2.5 seconds OFF
Large current flows into intelligent
power module.
•Reconnect compressor
connector.
•Refer to 10-5. "How
to check inverter/
compressor".
—
—
—
—
○
○
○
○
○
•Check stop valve.
Compressor synchronous
12-time flash
Waveform of compressor current is
distorted.
•Reconnect compressor
connector.
•Refer to 10-5. "How
to check inverter/
compressor".
abnormality (Compressor start- 2.5 seconds OFF
up failure protection)
5-time flash Discharge temperature
Temperature of discharge temperature •Check refrigerant circuit
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.
2.5 seconds
OFF
and refrigerant amount.
•Refer to 10-5. "Check
of LEV".
—
—
6-time flash High pressure
2.5 seconds (MUZ)
OFF
Temperature of indoor coil thermistor
exceeds 158°F (70°C) in HEAT mode.
Temperature of outdoor heat exchanger •Check stop valve.
temperature thermistor exceeds 158°F
(70°C) in COOL mode.
•Check refrigerant circuit
and refrigerant amount.
7-time flash Fin temperature/ P.C. board
2.5 seconds temperature
OFF
7-time flash
2.5 seconds OFF
Temperature of fin temperature
•Check around outdoor
unit.
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).
•Check outdoor unit air
passage.
—
—
•Refer to 10-5. "Check
of outdoor fan motor".
8-time flash Outdoor fan motor
Outdoor fan has stopped 3 times in a
•Refer to 10-5. "Check
2.5 seconds
OFF
row within 30 seconds after outdoor fan of outdoor fan motor".
—
○
○
○
start-up.
Refer to 10-5. "Check
of inverter P.C. board".
9-time flash Nonvolatile memory data
5-time flash
2.5 seconds OFF
Nonvolatile memory data cannot be
read properly.
•Replace the inverter
P.C. board.
2.5 seconds
OFF
○
10-time flash Discharge temperature
Temperature of discharge temperature •Refer to 10-5. "Check
thermistor has been 122°F (50°C) or
less for 20 minutes.
2.5 seconds
OFF
of LEV".
•Check refrigerant circuit
and refrigerant amount.
—
—
11-time flash DC voltage
8-time flash
DC voltage of inverter cannot be
detected normally.
•Refer to 10-5. "How
to check inverter/
compressor".
2.5 seconds
2.5 seconds OFF
—
OFF
○
Each phase current of
9-time flash
2.5 seconds OFF
Each phase current of compressor
cannot be detected normally.
compressor
12-time flash Overcurrent Compressor open- 10-time flash
Large current flows into intelligent
power module (IPM).
•Reconnect compressor
connector.
•Refer to 10-5. "How
to check inverter/
compressor".
2.5 seconds phase
OFF
2.5 seconds OFF
The open-phase operation of
compressor is detected.
—
○
○
The interphase short out occurs in the
output of the intelligent power module
(IPM).
The compressor winding shorts out.
14-time flash Stop valve (Closed valve)
2.5 seconds
OFF
14-time flash
2.5 seconds OFF
Closed valve is detected by compressor •Check stop valve
current.
○
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).
26
10-3. TROUBLESHOOTING CHECK TABLE
Abnormal point/
No. Symptom LED indication
Condition
Condition
Remedy
Outdoor 1-time flash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times
•Reconnect connector of compressor.
unit does 2.5 seconds
tem
within 1 minute after the compressor gets started, or failure of re- •Refer to 10-5. "How to check inverter/
1
not oper-
ate.
start of compressor has repeated 24 times.
compressor".
•Check stop valve.
Outdoor thermistors Discharge temperature thermistor, fin temperature thermistor, de- •Refer to 10-5. "Check of outdoor
frost thermistor, outdoor heat exchanger temperature thermistor, thermistors".
P.C. board temperature thermistor or ambient temperature therm-
2
3
istor shorts or opens during compressor running.
Outdoor control sys- Nonvolatile memory data cannot be read properly.
tem
•Replace inverter P.C. board.
(POWER lamp of the indoor unit lights up or flashes 7 times.)
6-time flash
Serial signal
Stop valve/
The communication fails between the indoor and outdoor unit for •Refer to 10-5. "How to check miswir-
4
5
2.5 seconds OFF
3 minutes.
ing and serial signal error.
11-time flash
Closed valve is detected by compressor current.
•Check stop valve.
2.5 seconds OFF Closed valve
14-time flash Outdoor unit
2.5 seconds OFF (Other abnormality)
Outdoor unit is defective.
•Refer to 10-2.2. "Flow chart of the de-
tailed outdoor unit failure mode recall
function".
6
7
'Outdoor 2-time flash
unit stops 2.5 seconds OFF tion
Overcurrent protec- Large current flows into intelligent power module.
•Reconnect connector of compressor.
•Refer to 10-5. "How to check inverter/
compressor".
When overcurrent protection occurs within 10 seconds after
compressor starts, compressor restarts after 15 seconds.
and re-
starts 3
minutes
•Check stop valve.
3-time flash
Discharge tempera- Temperature of discharge temperature thermistor exceeds 241°F •Check refrigerant circuit and refrigerant
later' is
2.5 seconds OFF ture overheat protec- (116°C), compressor stops. Compressor can restart if discharge
amount.
8
9
repeated.
tion
temperature thermistor reads 212°F (100°C) or less 3 minutes
later.
•Refer to 10-5. "Check of LEV".
4-time flash
Fin temperature /P.C. Temperature of fin temperature thermistor on the heat sink ex-
•Check around outdoor unit.
2.5 seconds OFF board temperature ceeds 167 ~ 176°F (75 ~ 80°C) or temperature of P.C. board tem- •Check outdoor unit air passage.
thermistor overheat perature thermistor on the inverter P.C. board exceeds 158 ~ 167 •Refer to 10-5. "Check of outdoor fan
protection
°F (70 ~ 75°C).
motor".
5-time flash
High pressure pro- Temperature of indoor coil thermistor exceeds 158°F (70°C) in
•Check refrigerant circuit and refrigerant
10
11
2.5 seconds OFF tection
HEAT mode. Temperature of outdoor heat exchanger temperature amount.
(MUZ)
thermistor exceeds 158°F (70°C) in COOL mode.
•Check stop valve.
8-time flash
2.5 seconds OFF chronous abnormal-
ity
Compressor syn-
The waveform of compressor current is distorted.
•Reconnect connector of compressor.
•Refer to 10-5. "How to check inverter/
compressor".
10-time flash
2.5 seconds OFF
Outdoor fan motor
Outdoor fan has stopped 3 times in a row within 30 seconds after •Refer to 10-5. "Check of outdoor fan
outdoor fan start-up.
motor.
12
•Refer to 10-5. "Check of inverter P.C.
board.
12-time flash
Each phase current Each phase current of compressor cannot be detected normally. •Refer to 10-5. "How to check inverter/
13
14
15
2.5 seconds OFF of compressor
compressor".
13-time flash
2.5 seconds OFF
DC voltage
DC voltage of inverter cannot be detected normally.
•Refer to 10-5. "How to check inverter/
compressor".
Outdoor 1-time flash
Frequency drop by Current from power outlet is nearing Max. fuse size.
The unit is normal, but check the follow-
ing.
unit oper- 2.5 seconds OFF current protection
ates.
•Check if indoor filters are clogged.
•Check if refrigerant is short.
•Check if indoor/outdoor unit air circula-
tion is short cycled.
3-time flash
Frequency drop by Temperature of indoor coil thermistor exceeds 131°F (55°C) in
2.5 seconds OFF high pressure protec- HEAT mode, compressor frequency lowers.
tion
16
17
Frequency drop by Indoor coil thermistor reads 46°F (8°C) or less in COOL mode,
defrosting in COOL compressor frequency lowers.
mode
4-time flash
Frequency drop by Temperature of discharge temperature thermistor exceeds 232°F •Check refrigerant circuit and refrigerant
2.5 seconds OFF discharge tempera- (111°C), compressor frequency lowers.
ture protection
amount.
•Refer to 10-5. "Check of LEV".
•Refer to 10-5. "Check of outdoor
thermistors".
Outdoor 7-time flash
Low discharge tem- Temperature of discharge temperature thermistor has been 122°F •Refer to 10-5. "Check of LEV".
18 unit oper- 2.5 seconds OFF perature protection (50°C) or less for 20 minutes.
ates.
•Check refrigerant circuit and refrigerant
amount.
8-time flash
PAM protection PAM: The overcurrent flows into IGBT (Insulated Gate Bipolar transis- This is not malfunction. PAM protection
2.5 seconds OFF Pulse Amplitude
Modulation
tor: TR821) or the bus-bar voltage reaches 320 V or more, PAM will be activated in the following cases:
19
20
stops and restarts.
1 Instantaneous power voltage drop
(Short time power failure)
2 When the power supply voltage is high.
9-time flash
2.5 seconds OFF
Inverter check mode The connector of compressor is disconnected, inverter check
mode starts.
•Check if the connector of the compres-
sor is correctly connected. Refer to
10-5. "How to check inverter/compres-
sor".
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 10-6.1.
2. LED is lighted during normal operation.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. Flashing
(Example) When the flashing frequency is “2”.
0.5-second ON
0.5-second ON
Inverter P.C. board (Parts side)
ON
LED
2.5-second OFF
2.5-second OFF
OFF
Flashing →
27
10-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA
MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA
Part name
Check method and criterion
Figure
Defrost thermistor (RT61)
(MUZ)
Fin temperature
thermistor (RT64)
Measure the resistance with a tester.
Ambient temperature
thermistor (RT65)
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.
Outdoor heat exchanger
temperature thermistor
(RT68)
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Discharge temperature
thermistor (RT62)
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.
Measure the resistance between terminals using a tester.
(Temperature: 14 ~ 104°F(-10 ~ 40°C))
WHT
RED BLK
Normal (Ω)
W
GE09
GE12
GE15/18
Compressor
U-V
U-W
V-W
1.36 ~ 1.93 1.52 ~ 2.17 0.78 ~ 1.11
V
U
Measure the resistance between lead wires using a tester.
(Temperature: 14 ~ 104°F(-10 ~ 40°C))
WHT
RED BLK
Normal (Ω)
Color of lead wire
W
GE09/12
GE15
GE18
Outdoor fan motor
RED – BLK
BLK – WHT
WHT – RED
V
28 ~ 40
11 ~ 16
U
Measure the resistance using a tester.
(Temperature: 14 ~ 104°F(-10 ~ 40°C))
R. V. coil (21S4)
(MUZ)
Normal (kΩ)
0.97 ~ 1.38
Measure the resistance using a tester.
(Temperature: 14 ~ 104°F(-10 ~ 40°C))
WHT
RED
ORN
LEV
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Normal (Ω)
Expansion valve coil
(LEV)
37 ~ 54
28
10-5. TROUBLESHOOTING FLOW
A How to check inverter/compressor
Disconnect the connector (CN61) between
compressor and the intelligent power module
(IPM).
See 10-5. “Check of open phase”.
Replace the inverter P.C. board.
See 10-5. “Check of compressor”.
Check the voltage between terminals.
Are the voltages balanced?
Yes
No
Check the 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 flashes 9 times. (Refer to 10-6.1.)
C Check of compressor
Refer to 10-5. “Check of compressor
winding”.
Is the compressor normal?
Replace the compressor.
No
No
Yes
Refer to 10-5. “Check of compressor
operation time”.
Does the compressor operate continuously?
Refer to 10-5. “Check of compressor start failure”.
Yes
OK.
29
D Check of compressor winding
● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance be-
tween 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
<<Judgement>>
0 second
●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.
Compressor starts
1 second
Abnormal
(IPM failure)
(Compressor winding short)
2 seconds
(TEST RUN OPERATION: Refer to 7-6.)
<<Measurement>>
Measure the time from the start of compressor to the stop of
compressor due to overcurrent.
Abnormal
(Compressor lock out)
(Starting defect)
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
10 seconds
10 minutes
Abnormal
(Refrigerant circuit defect)
(Closed valve)
Normal
F Check of compressor start failure
Confirm that 1~4 is normal.
• Electrical circuit check
1.Contact of the compressor connector (including CN61)
2.Output voltage of inverter P.C. board and balance of them (See 10-5. )
3.Direct current voltage between DB61(+) and (-) on the inverter P.C. board
4.Voltage between outdoor terminal block S1-S2
Check the refrigerant circuit.
Check the stop valve.
Does the compressor run for 10 seconds or
more after it starts?
Yes
No
No
After the compressor is heated with a drier,
does the compressor start? 1
Replace the compressor.
Yes
1
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
Compressor start failure. Activate pre-heat control.
(Refer to 9-2. "PRE-HEAT CONTROL SETTING")
Heating part
30
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 resistance of thermistor normal?
(Refer to 10-6.1.)
Replace the thermistor except RT64. When RT64 is
abnormal, replace the inverter P.C. board.
No
Yes
Reconnect the connector of thermistor.
Turn ON the power supply and press EMERGENCY OPERATION switch.
Does the unit operate for 10 minutes or more
Replace the inverter P.C. board.
No
without showing thermistor abnormality?
Yes
OK.
(Cause is poor contact.)
Thermistor
Defrost (MUZ)
Discharge temperature
Fin temperature
Symbol
Connector, Pin No.
Board
RT61 Between CN641 pin1 and pin2
RT62 Between CN641 pin3 and pin4
RT64 Between CN642 pin1 and pin2
RT65 Between CN643 pin1 and pin2
Inverter P.C. board
Ambient temperature
Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3
(MUZ)
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4.
H Check of R.V. coil
In case CN721 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 is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Disconnect connector (CN61)
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
and on the inverter P.C. board 3
minutes after the power supply is turned
ON?
Replace the inverter
P.C. board.
No
Yes
Replace the 4-way valve.
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector (CN61)
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
and on the inverter P.C. board 3
minutes after the power supply is turned
ON?
Replace the inverter
P.C. board.
Yes
No
Replace the 4-way valve.
31
I Check of outdoor fan motor
MUZ-GE09/12/15NA MUY-GE09/12/15NA
Disconnect CN932 from the inverter P.C. board,
and measure the resistance of the outdoor fan
motor.
Is the resistance of outdoor fan motor normal?
(Refer to 10-4.)
Replace the outdoor fan motor.
No
Yes
Replace the inverter P.C. board.
MUZ-GE18NA MUY-GE18NA
Check the connection between the
connector CN931 and CN932.
Is the resistance between each ter-
minal of outdoor fan motor normal?
(Refer to 10-4.)
No
Yes
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)
Does the voltage between each terminal become 5 and 0
VDC repeatedly?
No
Yes
Does the outdoor fan motor rotate smoothly?
Yes
No
Replace the inverter P.C. board.
Replace the outdoor fan motor.
32
J Check of power supply
Disconnect the connector (CN61)
between compressor and intelligent
power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Rectify indoor/outdoor
connecting wire.
Yes
Does The upper lamp of
OPERATION INDICATOR lamp on
the indoor unit light up?
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
Replace the indoor
electronic control P.C.
board.
No
No
No
Yes
Is there bus-bar voltage 260-325
VDC between DB61 (+) and DB61 (
–) on the inverter P.C. board?
(Refer to 10-6.1.)
Dose LED on the inverter P.C.
board light up or flash? (Refer
to 10-6.1.)
Replace the inverter
P.C. board.
Yes
Yes
No
260-325 VDC
If light up, OK.
If flash, refer to 10-3.
Check the electric parts in main circuit.
DB61
Inverter P.C. board
(Solder side)
33
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.
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
1. Regardless of normal or abnormal condition, a short beep
is emitted once the signal is received.
Expansion valve operates in full-opening direction.
Do you hear the expansion valve "click,
click·······"?
OK.
Do you feel the expansion valve vibrate
Yes
on touching it ?
No
Is LEV coil properly fixed to
the expansion valve?
Properly fix the LEV coil to the expansion valve.
No
Yes
Measure each voltage between connector
pins of CN724 on the inverter P.C. board.
1. Pin (-) — Pin (+)
2. Pin (-) — Pin (+)
Does the resistance of LEV
coil have the characteristics?
(Refer to 10-4.)
Replace the inverter P.C.
board.
3. Pin (-) — Pin (+)
4. Pin (-) — Pin (+)
Is there about 3 ~ 5 VAC between each?
NOTE: Measure the voltage by an analog
tester.
Yes
No
No
Replace the LEV coil.
Yes
Replace the expansion valve.
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.
34
L Check of inverter P.C. board
Check the outdoor fan motor.
(Refer to 10-5. .)
Is the fuse (F901) blown on the in-
verter P.C. board?
Yes
No
Check the connection of the connectors
(CN931, CN932) of the outdoor fan motor.
If the connection is poor, make it correct.
Operate the outdoor unit by starting
EMERGENCY OPERATION.
Check the remedy following LED
indication.
(Refer to 10-3.)
Check the LED indication on the in-
verter P.C. board.
Does the LED flash 10 times?
No
Yes
(10-time flash)
Replace the inverter P.C. board.
35
M How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
Yes
Check the power supply.
No
Turn ON the power supply.
No
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
Check the wiring.
Press EMERGENCY OPERATION switch once.
Does the OPERATION INDICATOR lamp light
up? <Confirmation of the power to the indoor
unit>
No
Yes
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connect-
ing wire?
Is serial signal error indicated 6 minutes later?
Yes
Correct them.
Yes
No
No
A
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the opera-
tion starts.
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
B
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.
and S3.
1
Turn ON the power supply.
Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal. (Refer
to "TEST POINT DIAGRAM AND VOLTAGE" in this manual.)
Check of power supply.
(Refer to 10-5. .)
No
Yes
Does the LED on the inverter P.C. board or the outdoor electronic control P.C.
Replace the inverter P.C. board or the outdoor
electronic control P.C. board.
2
No
board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"?
3
(Lighted
or not
lighted)
Yes
2. Be careful of the residual voltage of smoothing
capacitor.
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
Turn ON the power supply.
Check the wiring
If there are any error of the indoor/outdoor connecting wire:
such as the damage of the wire, intermediate connection,
and/or poor contact to the terminal block, replace the indoor/
outdoor connecting wire.
Is there rated voltage between indoor terminal block S1 and S2?
<Confirmation of power voltage>
No
No
Yes
Is there amplitude of 10 to 20 VDC between indoor terminal block S2
and S3? <Confirmation of serial signal>
Yes
A
Is there 2 VDC or less between CN10A (+)
and JPG (GND)(-) on the indoor electronic
control P.C. board?
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
No
Yes
• Press EMERGENCY OPERATION
switch.
Is there 2 VDC or less between
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
Yes
• Reinstall
either the unit
or the light
away from
each other.
• Attach a filter
on remote
No
Yes
No
Replace the indoor power
P.C. board and the indoor
terminal P.C. board
Replace the indoor elec-
tronic control P.C. board.
Is serial signal
error indicated 6
minutes later?
No
control receiv-
ing section
of the indoor
unit.
Yes
B
36
N Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Yes
Ground the unit.
No
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.?
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Yes
No
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.?
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Yes
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the anten-
na wiring?
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Yes
No
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wir-
ing of the antennas.
No
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength
or the installation condition (combination of specific 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 field intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifier 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 elec-
tromagnetic 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.
37
10-6. TEST POINT DIAGRAM AND VOLTAGE
1. Inverter P.C. board
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUY-GE09NA MUY-GE12NA MUY-GE15NA
Smoothing
capacitor
(C62)
Smoothing
capacitor
(C63)
Smoothing
capacitor
(C61)
Bus-bar voltage
DB61
DC 260-325 V
Fuse (F701)
T3.15 AL 250 V
Back side of unit
(-)
(+)
Fuse (F801)
250 V 3.15 A
AC 208/230 V
R.V.coil
(CN721)
208/230
VAC
(MUZ)
Fuse (F901)
T3.15 AL 250 V
Output to
drive
compressor
(LDU,
LDV,
AC 208/
230 V
LDW)
LED
LEV
connector
(CN724)
Jumper wire
for pre-heat
control setting
(JK)
Jumper wire for
changing defrost
setting (JS)(MUZ)
Front side of unit
Defrost thermistor(RT61) (MUZ)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
Fin temperature thermistor(RT64)
200
180
160
100
90
80
70
60
50
40
30
20
10
0
Discharge temperature thermistor(RT62)
700
600
500
400
300
200
100
0
140
120
100
80
60
40
20
0
32 50 68 86 104 122 140 158 176 194 212 230 248
32 50 68 86 104 122 140 158 176
Temperature(°F)
-4
14 32 50 68 86 104
Temperature(°F)
Temperature(°F)
38
MUZ-GE18NA MUY-GE18NA
Smoothing
capacitor
(C62)
Smoothing
capacitor
(C61)
Smoothing
capacitor
(C63)
R.V.coil
(CN721)
208/230
VAC
Bus-bar voltage
DB61
DC 260-325 V
Fuse (F701)
T3.15 AL 250 V
Back side of unit
(-)
(+)
Fuse (F801)
250 V 3.15 A
(MUZ)
AC 208/230 V
Fuse (F901)
T3.15 AL 250 V
Output to
drive
compressor
(LDU,
LDV,
AC 208/
230 V
LDW)
Front side of unit
Defrost thermistor(RT61) (MUZ)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
Fin temperature thermistor(RT64)
200
180
160
140
120
100
80
100
90
80
70
60
50
40
30
20
10
0
Discharge temperature thermistor(RT62)
700
600
500
400
300
200
100
0
60
40
20
0
32 50 68 86 104 122 140 158 176 194 212 230 248
32 50 68 86 104 122 140 158 176
Temperature(°F)
-4
14 32 50 68 86 104
Temperature(°F)
Temperature(°F)
39
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
Slide the sleeve.
Hold the sleeve, and
Pull the terminal while
pushing the locking
pull out the terminal
slowly.
Locking lever
lever.
Connector
11-1. MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA
MUY-GE09NA MUY-GE12NA MUY-GE15NA
NOTE: Turn OFF power supply before disassembling.
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(1) Remove the screw fixing the service panel.
(2) Pull down the service panel and remove it.
(3) Remove the screws fixing the conduit cover.
(4) Remove the conduit cover.
Screws
of the top
panel
Screw of the
cabinet
Screws of
the top panel
(5) Disconnect the power supply wire and indoor/outdoor
connecting wire.
Back
(6) Remove the screws fixing the top panel.
(7) Remove the top panel.
panel
(8) Remove the screws fixing the cabinet.
(9) Remove the cabinet.
(10) Remove the screws fixing the back panel.
(11) Remove the back panel.
Screw of
the service
panel
Photo 2
Hooks
Screw of the
conduit cover
Service
panel
Screws of
the cabinet
Conduit plate
Conduit cover
40
OPERATING PROCEDURE
PHOTOS
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:
Photo 3
Screws of the
relay panel
<Inverter P.C. board>
CN721 (R.V. coil) (MUZ)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor (MUZ) and discharge tempera-
ture 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 relay panel from the inverter assembly.
(8) Remove the inverter P.C. board from the relay panel.
Photo 4 (Inverter assembly)
Inverter
P.C. board
Screw of the
T.B.support
Heat sink
(MUZ)
T.B.support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN721 (R.V. coil)
(3) Remove the R.V. coil. (Photo 5)
Screw of the
ground wire
Relay panel
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger tempera-
ture 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:
Photo 5
R.V. coil (MUZ)
<Inverter P.C. board>
CN641 (Defrost thermistor (MUZ) and discharge tempera-
ture thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its hold-
er. (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.
Discharge temperature thermistor
41
OPERATING PROCEDURE
PHOTOS
Photo 6
5. Removing outdoor fan motor
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931, CN932 (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.
Outdoor heat
exchanger tempera-
ture 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.
Defrost thermistor
(MUZ)
Photo 7
Screws of the outdoor fan motor
(4) Detach the welded part of the suction and the discharge
pipe connected with compressor.
(5) Remove the nuts of compressor legs.
(6) Remove the compressor.
(7) Detach the welded part of pipes connected with 4-way
valve. (Photo 8.)
Propeller nut
Propeller
Photo 8
Welded parts of 4-way valve
42
11-2. MUZ-GE18NA MUY-GE18NA
OPERATING PROCEDURE
NOTE: Turn OFF power supply before disassembling.
PHOTOS
1. Removing the cabinet
Photo 1
(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.
Screw of the top panel
Screws of the cabinet
(5) Remove the top panel.
(6) Remove the valve cover.
(7) Disconnect the power supply and indoor/outdoor connect-
ing wire.
(8) Remove the screws of the cabinet.
(9) Remove the cabinet.
(10) Remove the screws of the back panel.
(11) Remove the back panel.
Screws
of the
back
panel
Screws
of the
cabinet
Photo 2
Screw of the top panel
Screws
of the
cabinet
Screw
of the
service
panel
Screw
of the
valve
cover
Screws of
the back
panel
43
OPERATING PROCEDURE
PHOTOS
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 con-
nectors:
Photo 3
Screws of the
relay panel
<Inverter P.C. board>
CN721 (R.V.coil) (MUZ)
CN931, CN932 (Fan motor)
CN641 (Defrost thermistor (MUZ) 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 screw of the PB fixture.
(8) Remove the relay panel from the PB support.
(9) Remove the inverter P.C. board from the inverter assembly.
Screws of
the reactor
Photo 4 (Inverter assembly)
Inverter P.C. Screw of the
board T.B.support
Heat sink
Hook of the
3. Removing R.V. coil
PB support
PB support
(1) Remove the cabinet and panels. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
T.B.support
CN721 (R.V. coil) (MUZ)
(3) Remove the R.V. coil. (Photo 5)
Screw of the
ground wire
Relay panel
Hook of the
Screw of the
PB fixture
PB support
Photo5
R.V. coil (MUZ)
Welded parts of 4-way valve
44
OPERATING PROCEDURE
PHOTOS
4. Removing the discharge temperature thermistor,
defrost thermistor, outdoor heat exchanger tempera-
ture 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:
Photo 6
Outdoor heat
exchanger tempera-
ture thermistor
Ambient tem-
perature
thermistor
<Inverter P.C. board>
CN641 (Defrost thermistor (MUZ) and discharge tempera-
ture thermistor)
CN643 (Ambient temperature thermistor)
CN644 (Outdoor heat exchanger temperature thermistor)
(3) Pull out the discharge temperature thermistor from its hold-
er. (Photo 8)
(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 6)
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>
Defrost thermistor
(MUZ)
CN931 and CN932 (Fan motor)
Photo 7
(3) Remove the propeller.
(4) Remove the screws fixing the fan motor.
(5) Remove the fan motor.
Screws of
the outdoor
fan motor
6. Removing the compressor and 4-way valve
(1) Remove the top panel, cabinet and service panel. (Refer to
1.)
Photo 8
Discharge temperature
thermistor
Welded part of the
discharge pipe
(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 PSIG.
(5) Detach the welded part of the suction and the discharge
pipe connected with compressor.
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the welded part of 4-way valve and pipe. (Photo 5)
Welded part of the
suction pipe
45
46
47
TM
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2009 MITSUBISHI ELECTRIC CO.,LTD
Distributed in Jul. 2009. No. OBH 549 5
Made in Japan
New publication, effective Jul. 2009
Specifications subject to change without notice.
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