Download Mitsubishi Electronics MUY-GE12NA Air Conditioner User Manual

SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
HFC
SERVICE MANUAL
utilized
No. OBH549
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.
1
TECHNICAL CHANGES
MUZ-GE09NA
MUZ-GE12NA
MUZ-GE15NA
MUZ-GE18NA
MUY-GE09NA
MUY-GE12NA
MUY-GE15NA
MUY-GE18NA
1. New model
2
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
Btu/h ( 3,800 ~ 12,200 ) ( 3,800 ~ 12,200 ) ( 3,800 ~ 13,600 ) ( 3,800
Cooling 1
~ 13,600 )
Capacity
Rated (Minimum~Maximum)
10,900
14,400
Btu/h ( 4,500 ~ 14,100 )
—
—
Heating 47 1
( 5,500 ~ 18,100 )
Btu/h
8,700
—
—
Capacity
Heating 17 2
11,200
Cooling
1
W
660
(205~1,200)
660
(205~1,200)
960
(205~1,300)
960
(205~1,300)
Power consumption
Rated (Minimum~Maximum) Heating 47 1
W
760 (255~1,200)
—
1,170 (340~1,660)
—
Power consumption Heating 17 2
W
950
—
1,200
—
EER 1 [SEER] 3
Cooling
13.6 [ 21.0 ]
13.6 [ 21.0 ]
12.5 [ 20.5 ]
12.5 [ 20.5 ]
Heating
10.0
—
10.0
—
HSPF IV 4
4.20
—
3.61
—
COP
Heating 1
Power supply
V , phase , Hz
208/230 , 1 , 60
Max. fuse size (time delay)
A
15
Min. circuit ampacity
A
12
12
12
12
Fan motor
F.L.A
0.50
Model
KNB073FQDHC
KNB092FQAHC
R.L.A
6.6
4.9
6.6
4.9
Compressor
L.R.A
8.2
6.1
8.2
6.1
Refrigeration oil cc. (Model)
320 (NEO22)
Refrigerant control
Linear expansion valve
Cooling
dB(A)
46
46
49
49
Sound level 1
Heating
dB(A)
50
—
51
—
Defrost method
Reverse cycle
W
in.
31-1/2
Dimensions
D
in.
11-1/4
H
in.
21-5/8
Weight
Ib.
66
77
External finish
Munsell 3Y 7.8/1.1
Remote controller
Wireless type
VDC
12 - 24
Control voltage (by built-in transformer)
Refrigerant piping
Not supplied
in.
1/4 (0.0315)
Refrigerant pipe size Liquid
(Min. wall thickness) Gas
in.
3/8 (0.0315)
Indoor
Flared
Connection method
Outdoor
Flared
Height
difference
ft.
40
Between the indoor &
outdoor units
Piping length
ft.
65
Refrigerant charge (R410A)
1 lb. 12 oz.
2 lb. 9 oz.
NOTE: Test conditions are based on ARI 210/240.
1: Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB)
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB
2:
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB
4
Rated frequency
Rated frequency
Maximum frequency
Outdoor unit model
MUZ-GE15NA
MUY-GE15NA
MUZ-GE18NA
MUY-GE18NA
14,000
14,000
17,200
17,200
Cooling 1
Btu/h ( 3,100 ~ 18,200 ) ( 3,100 ~ 18,200 ) ( 3,700 ~ 18,700 ) ( 3,700
~ 18,700 )
Capacity
Rated (Minimum~Maximum)
18,000
21,600
Btu/h ( 4,800 ~ 20,900 )
—
—
Heating 47 1
( 3,500 ~ 25,200 )
Btu/h
15,900
—
—
Capacity
Heating 17 2
17,200
Cooling
1
W
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
W
1,600 (270 ~ 2,010)
—
1,900 (230 ~ 2,680)
—
Power consumption Heating 17 2
W
1,950
—
2,080
—
Cooling
13.0 [ 21.0 ]
13.0 [ 21.0 ]
10.5 [19.2]
10.5 [19.2]
EER 1 [SEER] 3
Heating
10.0
—
10.0
—
HSPF IV 4
3.30
—
3.33
—
COP
Heating 1
Power supply
V , phase , Hz
208/230 , 1 , 60
Max. fuse size (time delay)
A
15
Min. circuit ampacity
A
12
14
Fan motor
F.L.A
0.50
0.93
Model
SNB130FQBH
R.L.A
7.4
6.8
10.0
10.0
Compressor
L.R.A
9.3
8.5
12.5
12.5
Refrigeration oil cc. (Model)
450 (NEO22)
Refrigerant control
Linear expansion valve
Cooling
dB(A)
49
49
54
54
Sound level 1
Heating
dB(A)
51
—
56
—
Defrost method
Reverse cycle
W
in.
31-1/2
33-1/16
Dimensions
D
in.
11-1/4
13
H
in.
21-5/8
33-7/16
Weight
Ib.
80
119
External finish
Munsell 3Y 7.8/1.1
Remote controller
Wireless type
VDC
12 - 24
Control voltage (by built-in transformer)
Refrigerant piping
Not supplied
in.
1/4 (0.0315)
Refrigerant pipe size Liquid
(Min. wall thickness) Gas
in.
1/2 (0.0315)
Indoor
Flared
Connection method
Outdoor
Flared
40
50
Between the indoor & Height difference ft.
outdoor units
Piping length
ft.
65
100
Refrigerant charge (R410A)
2 lb. 9 oz.
3 lb. 7 oz.
NOTE: Test conditions are based on ARI 210/240.
1: Rating conditions (Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB)
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB
2:
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB
5
Rated frequency
Rated frequency
Maximum frequency
Test condition
3, 4
ARI
Mode
Indoor air condition (°F)
Dry bulb
Wet bulb
Test
Outdoor air condition (°F)
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
67
82
(65)
SEER "B-1" Cooling Steady State
(Cooling) at minimum compressor Speed
80
67
82
(65)
"F-1" Cooling Steady State
at minimum compressor Speed
80
67
67
(53.5)
"E-V" Cooling Steady State
at Intermediate compressor Speed 5
80
67
87
(69)
"H1-2" Heating Steady State
at rated compressor Speed
70
60
47
43
"H3-2" Heating
at rated compressor Speed
70
60
17
15
70
60
62
56.5
70
60
47
43
70
60
35
33
HSPF
"H0-1" Heating Steady State
(Heating)
at minimum compressor Speed
(MUZ)
"H1-1" Heating Steady State
at minimum compressor Speed
"H2-V" Heating
at Intermediate compressor Speed 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
Outdoor unit
Guaranteed voltage (V)
208/230 V
1 phase
60 Hz
Min. 187
208
230
Max. 253
(2) OPERATION
Intake air temperature (°F)
Mode
Condition
Standard temperature
Maximum temperature
Cooling
Minimum temperature
Maximum humidity
Standard temperature
Heating Maximum temperature
(MUZ)
Minimum temperature
Indoor
Outdoor
DB
80
90
67
WB
67
73
57
DB
95
115
14
60
67
60
47
75
-4
78 %
WB
—
—
—
—
70
80
70
6
43
65
-5
4
OUTLINES AND DIMENSIONS
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA
MUY-GE09NA MUY-GE12NA MUY-GE15NA
Unit: inch
REQUIRED SPACE
1-3/4
15-3/4
Drain hole
. or
13-9/16
11/16
12 ~ 12-3/4
Air in
Air in
4 in
4 in
. or
mo
re
14
ore
2- 3/8
8
13/16 Oval hole
29/32
7/8
11-1/4
rm
in. o
in.
or m
ore
17/32
Open two sides of left,
right, or rear side.
handle
Liquid pipe
Gas pipe
5-7/8
2
11-1/32
13/32
e
mor
1-9/16
Air out
21-5/8
Basically open 4 inch or more
without any obstruction in front
and on both sides of the unit.
1-5/8
11-29/32
:1/4 (flared)
:3/8 (flared) (GE09/12)
1/2 (flared) (GE15)
6-23/32
19-11/16
5-15/16
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
11-25/32
2-19/32
Air in
4 inch or more/
8 inch or more if
there are obstacles
to both sides
1-9/16
2
Drain 3 holes
(ø1-5/16)
1-11/32
20-9/32
4 in
. or
14-3/16
13
Air in
mo
re
14
Air out
19-11/16
33-1/16
3-3/16
2-9/16
3-9/16
35°
30°
16-15/16
8-11/32
7
in.
or m
ore
Open as a rule
20 inch or more if the back,
both sides and top are open
33-7/16
4-25/32
4-3/8 × 13/16 slot
Liquid:1/4(flared)
Gas :1/2(flared)
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
MUZ-GE09NA MUY-GE09NA
Unit: inch
Refrigerant pipe ø3/8
(with heat insulator)
4-way valve
Muffler
Stop valve
(with service port)
Flared connection
Outdoor
heat
exchanger
Muffler
Discharge
temperature
thermistor
Service port
RT62
Compressor
Service port
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Defrost
thermistor
RT61
(MUZ)
Flared connection
Refrigerant pipe ø1/4
(with heat insulator)
Strainer
#100
Capillary tube
O.D. 0.118 × I.D. 0.079
× 9-7/16
LEV
(ø3.0 × ø2.0 × 240)
R.V. coil (MUZ)
heating ON
cooling OFF
Stop valve
(with strainar)
Refrigerant flow in cooling
Refrigerant flow in heating (MUZ)
MUZ-GE12NA MUZ-GE15NA MUY-GE12NA MUY-GE15NA
Refrigerant pipe ø3/8 (GE12NA)
Refrigerant pipe ø1/2 (GE15NA)
(with heat insulator)
Muffler
Stop valve
(with service port)
Flared connection
Unit: inch
4-way valve
Discharge
temperature
thermistor
RT62
Outdoor
heat
exchanger
Muffler
Service port
Compressor
Service port
Flared connection
Refrigerant pipe ø1/4
(with heat insulator)
Defrost
thermistor
RT61
(MUZ)
Capillary tube
O.D. 0.118 × I.D. 0.079
LEV
× 9-7/16
(ø3.0 × ø2.0 × 240)
Outdoor heat
exchanger
temperature
thermistor
RT68
Capillary tube
O.D. 0.118 × I.D. 0.071
× 23-5/8
(ø3.0 × ø1.8 × 600) (×2)
Ambient
temperature
thermistor
RT65
Strainer
#100
R.V. coil (MUZ)
heating ON
cooling OFF
Stop valve
(with strainar)
Refrigerant flow in cooling
Refrigerant flow in heating (MUZ)
11
MUZ-GE18NA MUY-GE18NA
Refrigerant pipe ø1/2
(with heat insulator)
Unit: inch
Muffler
4-way valve #100
Stop valve
(with service port)
Flared connection
Service port
Service port
Discharge
temperature
thermistor
RT62
Defrost
thermistor
RT61
Outdoor
heat
exchanger
(MUZ)
Ambient
temperature
thermistor
RT65
Compressor
Outdoor heat
exchanger
temperature
thermistor
RT68
Flared connection
LEV
Receiver
Refrigerant pipe ø1/4
(with heat insulator)
Stop valve
(with strainar)
Strainer
#100
R.V. coil (MUZ)
heating ON
cooling OFF
Capillary tube
O.D. 0.142 × I.D. 0.094
× 1-31/32
(ø3.6×ø2.4×50)
Refrigerant flow in cooling
Refrigerant flow in heating (MUZ)
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Model
MUZ-GE09/12/15NA
MUY-GE09/12/15NA
MUZ-GE18NA
MUY-GE18NA
Refrigerant piping: ft.
Max. Length
Max. Height difference
A
B
Piping size O.D: in.
Gas
65
40
3/8 (GE09/12)
1/2 (GE15)
100
50
1/2
Indoor
unit
Max. Height
difference
B
Max. Length
A
Outdoor unit
12
Liquid
1/4
ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)
Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
Model
MUZ-GE09NA
MUY-GE09NA
MUZ-GE12NA
MUY-GE12NA
MUZ-GE15NA
MUY-GE15NA
Outdoor unit
precharged
Refrigerant piping length (one way): ft.
40
50
25
30
0
1.62
60
65
11.34
12.96
1 lb. 12 oz.
4.86
8.10
2 lb. 9 oz.
Calculation: X oz. = 1.62/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
Model
MUZ-GE18NA
MUY-GE18NA
Refrigerant piping length (one way): ft.
50
60
70
80
Outdoor unit
precharged
25
30
40
3 lb. 7 oz.
0
1.08
3.24
5.40
7.56
9.72
11.88
90
100
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
Model
MUZ-GE09NA
MUY-GE09NA
MUZ-GE12NA
MUY-GE12NA
MUZ-GE15NA
MUY-GE15NA
MUZ-GE18NA
MUY-GE18NA
IWB (˚F)
71
67
63
71
67
63
71
67
63
71
67
63
TC
11.0
10.4
9.8
14.7
13.9
13.1
17.2
16.2
15.3
21.1
20.0
18.7
75
SHC
7.6
8.6
9.4
8.9
10.3
11.4
11.4
13.0
14.2
12.2
14.2
15.8
TPC
0.59
0.55
0.53
0.85
0.81
0.77
0.96
0.91
0.86
1.46
1.38
1.31
TC
10.3
9.7
9.1
13.7
13.0
12.1
16.0
15.1
14.1
19.7
18.6
17.4
Outdoor intake air DB temperature (˚F)
85
95
105
SHC TPC TC SHC TPC TC SHC
7.1 0.64 9.7
6.6 0.69 9.0
6.2
8.0 0.61 9.0
7.4 0.66 8.4
6.9
8.7 0.58 8.5
8.1 0.63 7.7
7.3
8.3 0.94 12.9 7.8 1.01 12.0 7.3
9.6 0.89 12.0 8.9 0.96 11.2 8.3
10.6 0.85 11.3 9.9 0.92 10.3 9.0
10.7 1.05 15.1 10.0 1.13 14.0 9.3
12.1 1.00 14.0 11.2 1.08 13.0 10.4
13.2 0.96 13.2 12.3 1.03 12.0 11.2
11.4 1.60 18.5 10.7 1.72 17.2 9.9
13.2 1.52 17.2 12.2 1.64 16.0 11.4
14.7 1.45 16.2 13.6 1.57 14.7 12.4
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
TPC
0.73
0.70
0.67
1.06
1.02
0.98
1.19
1.14
1.10
1.81
1.74
1.67
115
TC SHC TPC
8.3
5.7 0.76
7.7
6.3 0.73
7.0
6.7 0.70
11.0 6.7 1.10
10.3 7.6 1.07
9.4
8.2 1.02
12.9 8.6 1.24
12.0 9.6 1.20
10.9 10.2 1.14
15.8 9.1 1.89
14.7 10.4 1.82
13.4 11.3 1.74
2) COOLING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.)
40
MUZ-GE09NA
MUY-GE09NA
MUZ-GE12NA
MUY-GE12NA
1.0
0.954
MUZ-GE15NA
MUY-GE15NA
MUZ-GE18NA
MUY-GE18NA
65
0.878
3) HEATING CAPACITY (MUZ)
Indoor air
Model
5
IDB (˚F)
TC
4.8
5.2
5.5
6.3
6.8
7.2
7.9
8.6
9.0
9.1
9.8
10.3
75
70
65
75
70
65
75
70
65
75
70
65
MUZ-GE09NA
MUZ-GE12NA
MUZ-GE15NA
MUZ-GE18NA
15
TPC
0.45
0.43
0.41
0.69
0.66
0.63
0.63
0.60
0.57
0.64
0.62
0.59
TC
6.3
6.7
6.9
8.4
8.9
9.1
10.4
11.1
11.3
11.9
12.7
13.0
TPC
0.57
0.55
0.52
0.87
0.84
0.81
0.79
0.76
0.73
0.81
0.78
0.75
Outdoor intake air WB temperature (˚F)
25
35
43
TC TPC TC TPC TC TPC
7.9 0.67 9.4 0.74 10.6 0.78
8.2 0.65 9.6 0.72 10.9 0.76
8.6 0.63 10.0 0.70 11.2 0.74
10.4 1.02 12.5 1.14 14.0 1.20
10.8 1.00 12.7 1.11 14.4 1.17
11.3 0.97 13.2 1.08 14.8 1.14
13.1 0.93 1.56 1.03 17.6 1.09
13.5 0.91 15.9 1.01 18.0 1.06
14.1 0.87 16.5 0.98 18.5 1.03
14.9 0.95 17.8 1.06 20.1 1.12
15.5 0.93 18.2 1.04 20.6 1.09
16.2 0.90 18.8 1.01 21.2 1.06
45
TC
11.0
11.2
11.6
14.5
14.8
15.3
18.1
18.5
19.1
20.7
21.2
21.8
55
TPC
0.79
0.78
0.75
1.22
1.19
1.16
1.10
1.08
1.05
1.13
1.11
1.08
TC
12.4
12.7
13.0
16.4
16.8
17.1
20.5
21.0
21.4
23.5
24.0
24.5
TPC
0.82
0.81
0.79
1.26
1.24
1.22
1.14
1.12
1.10
1.18
1.16
1.13
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
ke air
WB te
mpera
10
ture (°
F)
9
71
67
63
8
Total power consumption
(kW)
7
peratu
B tem
e air W
r intak
Indoo
)
re (°F
71
67
63
0.6
0.5
65
75
85
95
105
Outdoor intake air DB temperature (°F)
115
14
B te
mpe
ratu
12
re (°
11
10
9
1.2
0.9
F)
71
67
63
1.1
ke air
r inta
Indoo
ture
mpera
WB te
(°F)
71
67
63
0.8
0.7
65
75
85
95
105
Outdoor intake air DB temperature (°F)
14
SHF at rating condition = 0.80
Airflow = 498 CFM
17
ir W
13
1.0
18
115
Total capacity
( 103 Btu/h)
r inta
11
0.7
Indo
or in
take
a
15
Indoo
Total capacity
( 103 Btu/h)
12
Total power consumption
(kW)
Total capacity
( 103 Btu/h)
13
SHF at rating condition = 0.73
Airflow = 350 CFM
16
15
14
13
Indoo
r inta
ke air
12
71
67
63
WB te
mpera
ture (°
F)
11
Total power consumption
(kW)
SHF at rating condition = 0.76
Airflow = 307 CFM
MUZ-GE15NA
MUY-GE15NA
1.3
71
67
63
1.2
1.1
1.0
0.9
0.8
65
e air
r intak
Indoo
75
85
F
ture (°
mpera
)
WB te
95
105
Outdoor intake air DB temperature (°F)
115
MUZ-GE18NA
MUY-GE18NA
SHF at rating condition = 0.71
Airflow = 498 CFM
22
Total capacity
( 103 Btu/h)
21
20
19
18
Indoo
17
r inta
16
ke air
15
F)
14
Total power consumption
(kW)
71
67
WB te
mpera
ture (°
63
1.9
71
67
63
1.8
1.7
1.6
1.4
take
door in
(°F)
re
peratu
B tem
1.5
air W
In
1.3
65
75
85
95
105
115
Outdoor intake air DB temperature (°F)
Heating (MUZ)
MUZ-GE09NA
MUZ-GE12NA
Airflow = 413 CFM
Total capacity
( 103 Btu/h)
14
Airflow = 413 CFM
65
70
75
°F)
13
12
11
10
9
e
tak
r in
oo
Ind
(
ure
rat
pe
m
e
t
DB
air
°F)
20
Total capacity
( 103 Btu/h)
15
8
16
B
ir D
ea
tak
n
i
r
oo
Ind
12
65
70
75
(
ure
rat
pe
m
te
8
7
4
1.0
75
70
65
0.8
0.6
r
Indoo
0.4
5
15
25
F)
ture (°
mpera
DB te
e air
k
ta
in
35
45
55
65
Total power consumption
(kW)
Total power consumption
(kW)
6
5
1.2
1.1
1.0
)
re (°F
0.9
ke air
r inta
Indoo
0.8
0.7
DB te
tu
mpera
0.6
0.5
70
75
70
65
1.3
5
15
Outdoor intake air WB temperature (°F)
25
35
45
55
65
70
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
Airflow = 463 CFM
21
19
tak
r in
oo
Ind
Bt
ir D
ea
)
(°F
ra
pe
em
17
15
13
e
tur
65
70
75
26
24
22
20
18
16
9
14
7
5
12
10
75
70
65
1.5
1.2
r
Indoo
0.9
0.6
5
15
25
F
ture (°
mpera
DB te
e air
k
ta
in
35
45
55
)
65
70
65
70
75
28
11
1.8
Airflow = 463 CFM
30
Total power consumption
(kW)
Total power consumption
(kW)
Total capacity
( 103 Btu/h)
23
Total capacity
( 103 Btu/h)
25
tak
r in
oo
Ind
ur
rat
pe
em
t
B
ir D
ea
e(
°F)
75
70
65
2.1
1.9
1.7
1.5
1.3
DB
ke air
r inta
Indoo
1.1
0.9
)
re (°F
eratu
temp
0.7
0.5 5
15
Outdoor intake air WB temperature (°F)
25
35
45
55
65
70
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)
200
400
rature (°F)
Indoor DB tempe
80
180
360
°F)
(
ture
era
mp
320
280
68 70
86
86
80
75
70
Suction pressure
Condensing pressure
(PSIG)
440
oor
Ind
75
80
te
DB
75
70
160
140
85
95
90
120
68 70
100 105(°F)
Outdoor ambient temperature
75
80
85
90
95
100 105(°F)
Outdoor ambient temperature
MUZ-GE12NA MUY-GE12NA
(PSIG)
190
86
80
75
70
380
170
Suction pressure
Condensing pressure
(PSIG)
420
340
DB
oor
Ind
300
260
68 70
75
80
(°
ture
era
p
tem
85
F)
95
90
150
86
80
°F)
re (
atu
r
e
mp
B te
rD
o
o
Ind
75
70
130
110
68 70
100 105(°F)
Outdoor ambient temperature
75
80
85
90
95
100 105(°F)
Outdoor ambient temperature
MUZ-GE15NA MUY-GE15NA
(PSIG)
200
86
80
75
70
400
360
°F)
re (
tu
era
mp
B te
320
280
68 70
86
180
Suction pressure
Condensing pressure
(PSIG)
440
Ind
80
85
Indoo
80
75
160
70
140
D
oor
75
(°F)
r DB temperature
90
95
120
68 70
100 105(°F)
Outdoor ambient temperature
75
80
85
90
95
Outdoor ambient temperature
16
100 105(°F)
MUZ-GE18NA MUY-GE18NA
(PSIG)
160
86
80
75
70
86
)
390
re
(°F
p
B
rD
tem
oo
350
Ind
80
145
tu
era
Suction pressure
Condensing pressure
(PSIG)
430
310
75
70
130
°F)
re (
115
atu
per
m
B te
rD
oo
Ind
270
68 70
75
80
85
95
90
100
68 70
100 105(°F)
75
Outdoor ambient temperature
80
85
90
95
100 105(°F)
Outdoor ambient temperature
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
75
70
65
re (
atu
320
or
ndo
DB
er
mp
te
I
295
270
5
15
25
35
45
55
65
160
°F)
re (
atu
135
oor
Ind
DB
er
mp
te
110
58Hz
58Hz
245
220
185
°F)
Suction pressure
Condensing pressure
345
75
70
65
85
60
75(°F)
5
15
Outdoor ambient temperature
25
35
45
55
65
75(°F)
Outdoor ambient temperature
MUZ-GE12NA
(PSIG)
(PSIG)
460
210
(°F
tu
ra
Suction pressure
Condensing pressure
)
re
e
mp
380
B
te
rD
oo
Ind
340
58Hz
160
°F)
re (
atu
er
mp
B te
135
or D
o
Ind
110
58Hz
300
260
185
75
70
65
420
75
70
65
85
5
15
25
35
45
55
65
75(°F)
60
Outdoor ambient temperature
5
15
25
35
45
55
Outdoor ambient temperature
17
65
75(°F)
MUZ-GE15NA
(PSIG)
(PSIG)
440
210
75
70
65
185
F)
e (°
r
atu
per
Suction pressure
Condensing pressure
404
m
B te
D
oor
Ind
368
332
160
ture
)
(°F
a
per
m
135
B te
rD
oo
Ind
110
54Hz
296
260
75
70
65
54Hz
85
5
15
25
35
45
55
65
60
75(°F)
5
15
25
Outdoor ambient temperature
35
45
55
65
75(°F)
Outdoor ambient temperature
MUZ-GE18NA
(PSIG)
(PSIG)
500
210
75
70
65
475
75
70
65
185
)
Suction pressure
Condensing pressure
450
°F
e(
425
tur
ra
e
mp
400
B
te
D
or
o
375
Ind
)
160
re
(°F
u
at
r
pe
m
135
B
te
rD
oo
nd
I
110
350
58Hz
58Hz
85
325
300
5
15
25
35
45
55
65
75(°F)
60
Outdoor ambient temperature
5
15
25
35
45
55
Outdoor ambient temperature
18
65
75(°F)
7-4. STANDARD OPERATION DATA
MSZ-GE09NA
Unit
MSZ-GE09NA
MSY-GE09NA
Cooling
Btu/h
9,000
Model
Item
Total
Capacity
MSZ-GE12NA
Heating
MSZ-GE12NA
MSY-GE12NA
Cooling
10,900
12,000
14,400
SHF
-
0.82
—
0.74
—
Input
kW
0.660
0.760
0.960
1.170
Rated frequency
Hz
59.5
77.5
69.0
77.0
Indoor unit
MSZ-GE09NA, MSY-GE09NA
Refrigerant circuit
Electrical circuit
Power supply (V, Phase, Hz)
Fan motor current
kW
0.022
0.023
A
0.24/0.22
MUZ-GE09NA
MUY-GE09NA
0.25/0.23
Outdoor unit
Power supply (V, phase, Hz)
Input
0.022
0.023
0.24/0.22
MUZ-GE12NA
MUZ-GE09NA
MUY-GE12NA
208/230, 1, 60
0.25/0.23
MUZ-GE12NA
kW
0.638
0.737
0.938
1.147
Comp. current
A
3.32/3.00
3.66/3.31
4.39/3.97
5.41/4.89
Fan motor current
A
0.27/0.24
0.30/0.27
0.34/0.31
0.31/0.28
Condensing pressure
PSIG
389
331
389
397
Suction pressure
PSIG
151
103
133
104
Discharge temperature
°F
154
152
163
162
Condensing temperature
°F
115
103
115
116
Suction temperature
°F
59
39
56
35
Comp. shell bottom temp
°F
151
149
158
158
Ref. pipe length
ft.
Intake air temperature
Indoor unit
MSZ-GE12NA, MSY-GE12NA
208 / 230, 1, 60
Input
Refrigerant charge (R410A)
Discharge air temperature
°F
1 lb. 12 oz.
80
2 lb. 9 oz.
70
80
70
WB
°F
67
60
67
60
DB
°F
60
97
56
108
WB
Fan speed (High)
Intake air temperature
25
DB
Airflow (High)
Outdoor unit
Heating
DB
WB
°F
58
—
55
—
rpm
1,020
1,040
1,020
1,040
CFM
367 (Wet)
413
367 (Wet)
413
°F
95
47
95
47
°F
—
43
—
43
Fan speed
rpm
800
850
900
860
Airflow
CFM
1151
1225
1229
1172
19
MSZ-GE15NA
Unit
MSZ-GE15NA
MSY-GE15NA
Cooling
Btu/h
14,000
Model
Item
Total
Capacity
MSZ-GE18NA
Heating
MSZ-GE18NA
MSY-GE18NA
Cooling
18,000
17,200
21,600
SHF
-
0.80
—
0.71
—
Input
kW
1.080
1.600
1.640
1.900
Rated frequency
Hz
55.5
74.0
83.0
84.0
Indoor unit
MSZ-GE15NA, MSY-GE15NA
Refrigerant circuit
Electrical circuit
Power supply (V, Phase, Hz)
Fan motor current
kW
0.045
0.031
A
0.50/0.45
MUZ-GE15NA
MUY-GE15NA
0.35/0.32
Outdoor unit
Power supply (V, phase, Hz)
Input
0.043
0.037
0.43/0.39
MUZ-GE18NA
MUZ-GE15NA
MUY-GE18NA
208/ 230, 1, 60
0.40/0.36
MUZ-GE18NA
kW
1,035
1,569
1,595
1,860
Comp. current
A
4.86/4.40
7.38/6.67
6.97/6.29
8.36/7.55
Fan motor current
A
0.33/0.30
0.34/0.31
0.80/0.72
0.64/0.59
Condensing pressure
PSIG
400
431
376
458
Suction pressure
PSIG
139
99
117
102
Discharge temperature
°F
164
179
177
184
Condensing temperature
°F
117
122
112
127
Suction temperature
°F
57
31
59
33
Comp. shell bottom temp
°F
148
165
164
170
Ref. pipe length
ft.
Intake air temperature
Indoor unit
MSZ-GE18NA, MSY-GE18NA
208/230, 1, 60
Input
Refrigerant charge (R410A)
Discharge air temperature
°F
2 lb. 9 oz.
80
3 lb. 7 oz.
70
80
70
WB
°F
67
60
67
60
DB
°F
60
114
56
117
WB
Fan speed (High)
Intake air temperature
25
DB
Airflow (High)
Outdoor unit
Heating
DB
WB
°F
57
—
54
—
rpm
1,280
1,140
1,280
1,240
CFM
498 (Wet)
463
498 (Wet)
512
°F
95
47
95
47
°F
—
43
—
43
Fan speed
rpm
910
900
780
740
Airflow
CFM
1,243
1,229
1,730
1,659
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
0
50
100
1.5
1.0
0.5
150 (Hz)
0
50
100
2.0
Input correction factors
0.5
2.0
Capacity correction factors
Input correction factors
Capacity correction factors
1.0
Correction of Heating total input
Correction of Heating capacity
2.0
1.5
1.5
1.0
0.5
0
150 (Hz)
50
100
1.5
1.0
0.5
150 (Hz)
0
The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor
MUZ-GE12NA
MUY-GE12NA
Correction of Cooling total input
100
1.0
0.5
150 (Hz)
0
50
100
1.5
Input correction factors
0.5
Capacity correction factors
1.0
1.0
0.5
0
150 (Hz)
50
100
1.0
0.5
150 (Hz)
0
The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor
MUZ-GE15NA
MUY-GE15NA
Correction of Cooling total input
50
100
150 (Hz)
1.5
1.0
0.5
0
50
100
150 (Hz)
1.0
0.5
0
50
100
MUZ-GE18NA
MUY-GE18NA
Correction of Cooling total input
0
50
100
150 (Hz)
The operational frequency of compressor
100
150 (Hz)
1.0
0.5
0
50
100
150 (Hz)
1.5
Input correction factors
0.5
Capacity correction factors
1.0
Correction of Heating total input
Correction of Heating capacity
1.5
1.5
Input correction factors
1.5
Capacity correction factors
0.5
MUZ-GE18NA
Correction of Cooling capacity
50
1.0
150 (Hz)
The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor
0
150 (Hz)
1.5
Input correction factors
0.5
Capacity correction factors
Input correction factors
Capacity correction factors
1.0
100
Correction of Heating total input
Correction of Heating capacity
1.5
2.0
1.5
50
The operational frequency of compressor
MUZ-GE15NA
Correction of Cooling capacity
2.0
0
150 (Hz)
Correction of Heating total input
Correction of Heating capacity
1.5
1.5
Input correction factors
Capacity correction factors
1.5
50
100
MUZ-GE12NA
Correction of Cooling capacity
0
50
The operational frequency of compressor
1.0
0.5
0
50
100
1.0
0.5
150 (Hz)
The operational frequency of compressor The operational frequency of compressor 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.
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 . . . . . . . . . . . . . . . . . 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
Compressor
ON
OFF
R.V.coil
ON
OFF
5 seconds
Outdoor fan ON
OFF
motor
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor
Discharge temperature
thermistor
Indoor coil temperature
thermistor
Defrost thermistor (MUZ)
Fin temperature thermistor
Ambient temperature
thermistor
Outdoor heat exchanger temperature thermistor
Purpose
Protection
Cooling: Coil frost prevention
Heating: High pressure protection
Heating: Defrosting
Protection
Cooling: Low ambient temperature operation
Cooling: Low ambient temperature operation
Cooling: High pressure protection
Compressor
LEV
○
○
○
○
○
○
○
○
○
22
○
○
○
○
○
Actuator
Outdoor fan
motor
○
○
○
○
○
R.V.coil
(MUZ)
Indoor fan
motor
○
○
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.)
Jumper
JS
Defrost finish temperature
MUZ-GE09/12/15
MUZ-GE18
Soldered
(Initial setting)
41°F (5°C)
48°F (9°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-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 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.
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.
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
lamp of OPERATION INDICATOR lamp. 2
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities 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)
Yes
(Blinks)
Judgment of indoor/outdoor abnormality
Before blinking, does the upper lamp of OPERATION INDICATOR lamp stay ON for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
Yes
The outdoor unit is abnormal.
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. 3
The indoor 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.)
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.
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 0.52.5-second OFF second interval
Blinking at 0.52.5-second OFF second interval
ON
OFF
Beeps
Repeated cycle
Beeps
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.52.5-second OFF
3-second ON
second interval
Beeps
Repeated cycle
2.5-second OFF
3-second ON
Blinking at 0.5second interval
ON
OFF
No beep
Repeated cycle
Beeps
No beep
Repeated cycle
24
Beeps
Repeated cycle
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
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
lamp of OPERATION INDICATOR lamp. 2
Yes
(Blinks)
1. Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
No
(OFF)
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (10-2.3.).
Make sure to check at least two consecutive blinking cycles. 2
The outdoor unit is normal.
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 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
Blinking at 0.5second interval
2.5-second OFF
3-second ON
Blinking at 0.5second interval
ON
OFF
No beep
Repeated cycle
No beep
Repeated cycle
Beeps
25
Beeps
Repeated cycle
3. Outdoor unit failure mode table
POWER lamp
(Indoor unit)
Abnormal point
(Failure mode / protection)
LED indication
(Outdoor P.C. board)
Condition
Remedy
—
—
—
OFF
None (Normal)
2-time flash
2.5 seconds
OFF
Outdoor power system
3-time flash
2.5 seconds
OFF
Discharge temperature
thermistor
Defrost thermistor (MUZ)
1-time flash every
2.5 seconds
Fin temperature thermistor
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
2-time flash
2.5 seconds OFF
11-time flash
2.5 seconds OFF
4-time flash
2.5 seconds
OFF
—
P.C. board temperature
thermistor
Ambient temperature
thermistor
Overcurrent
Overcurrent protection stop is
continuously performed 3 times within
1 minute after the compressor gets
started.
Thermistor shorts or opens during
compressor running.
Large current flows into intelligent
power module.
Compressor synchronous
12-time flash
abnormality (Compressor start- 2.5 seconds OFF
up failure protection)
Waveform of compressor current is
distorted.
5-time flash
2.5 seconds
OFF
Discharge temperature
6-time flash
2.5 seconds
OFF
High pressure
(MUZ)
7-time flash
2.5 seconds
OFF
Fin temperature/ P.C. board
temperature
8-time flash
2.5 seconds
OFF
Outdoor fan motor
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 outdoor heat exchanger
temperature thermistor exceeds 158°F
(70°C) in COOL mode.
Temperature of fin 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.
—
—
7-time flash
2.5 seconds OFF
—
9-time flash Nonvolatile memory data
2.5 seconds
OFF
10-time flash Discharge temperature
2.5 seconds
OFF
5-time flash
2.5 seconds OFF
11-time flash DC voltage
2.5 seconds
OFF
Each phase current of
compressor
12-time flash Overcurrent Compressor open2.5 seconds phase
OFF
8-time flash
2.5 seconds OFF
9-time flash
2.5 seconds OFF
10-time flash
2.5 seconds OFF
14-time flash Stop valve (Closed valve)
2.5 seconds
OFF
—
14-time flash
2.5 seconds OFF
Nonvolatile memory data cannot be
read properly.
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 flows into intelligent
power module (IPM).
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.
Closed valve is detected by compressor
current.
• 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
identified by checking
the blinking pattern of
LED.
—
—
○
○
○
○
—
○
• 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".
• Check refrigerant circuit
and refrigerant amount.
• Refer to 10-5. "Check
of LEV".
—
○
—
○
• Check refrigerant circuit
and refrigerant amount.
• Check stop valve.
—
○
—
○
—
○
○
○
—
○
—
○
—
○
○
○
• 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. "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".
• Check stop valve
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).
26
Indoor/
unit
outdoor unit Outdoor
failure mode
failure mode recall
function
recall function
10-3. TROUBLESHOOTING CHECK TABLE
No. Symptom
Outdoor
does
1 unit
not operate.
2
3
4
5
6
'Outdoor
stops
7 unit
and restarts 3
minutes
later' is
8 repeated.
9
10
11
12
13
14
15 Outdoor
unit operates.
16
17
Outdoor
18 unit operates.
19
20
Abnormal point/
Condition
Remedy
Condition
1-time flash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times
• Reconnect connector of compressor.
2.5 seconds
tem
within 1 minute after the compressor gets started, or failure of re- • Refer to 10-5. "How to check inverter/
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 thermistor shorts or opens during compressor running.
Outdoor control sys- Nonvolatile memory data cannot be read properly.
• Replace inverter P.C. board.
tem
(POWER lamp of the indoor unit lights up or flashes 7 times.)
6-time flash
Serial signal
The communication fails between the indoor and outdoor unit for • Refer to 10-5. "How to check miswir2.5 seconds OFF
3 minutes.
ing and serial signal error.
11-time flash
Stop valve/
Closed valve is detected by compressor current.
• Check stop valve.
2.5 seconds OFF Closed valve
14-time flash
Outdoor unit
Outdoor unit is defective.
• Refer to 10-2.2. "Flow chart of the de2.5 seconds OFF (Other abnormality)
tailed outdoor unit failure mode recall
function".
2-time flash
Overcurrent protec- Large current flows into intelligent power module.
• Reconnect connector of compressor.
2.5 seconds OFF tion
When overcurrent protection occurs within 10 seconds after
• Refer to 10-5. "How to check inverter/
compressor starts, compressor restarts after 15 seconds.
compressor".
• Check stop valve.
3-time flash
Discharge tempera- Temperature of discharge temperature thermistor exceeds 241°F • Check refrigerant circuit and refrigerant
2.5 seconds OFF ture overheat protec- (116°C), compressor stops. Compressor can restart if discharge
amount.
• Refer to 10-5. "Check of LEV".
tion
temperature thermistor reads 212°F (100°C) or less 3 minutes
later.
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
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
Compressor synThe waveform of compressor current is distorted.
• Reconnect connector of compressor.
• Refer to 10-5. "How to check inverter/
2.5 seconds OFF chronous abnormality
compressor".
10-time flash
Outdoor fan motor
Outdoor fan has stopped 3 times in a row within 30 seconds after • Refer to 10-5. "Check of outdoor fan
2.5 seconds OFF
outdoor fan start-up.
motor.
• 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/
2.5 seconds OFF of compressor
compressor".
13-time flash
DC voltage
DC voltage of inverter cannot be detected normally.
• Refer to 10-5. "How to check inverter/
2.5 seconds OFF
compressor".
1-time flash
Frequency drop by Current from power outlet is nearing Max. fuse size.
The unit is normal, but check the follow2.5 seconds OFF current protection
ing.
• Check if indoor filters are clogged.
3-time flash
Frequency drop by Temperature of indoor coil thermistor exceeds 131°F (55°C) in
•
Check if refrigerant is short.
2.5 seconds OFF high pressure protec- HEAT mode, compressor frequency lowers.
• Check if indoor/outdoor unit air circulation
tion is short cycled.
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.
amount.
ture protection
• Refer to 10-5. "Check of LEV".
• Refer to 10-5. "Check of outdoor
thermistors".
7-time flash
Low discharge tem- Temperature of discharge temperature thermistor has been 122°F • Refer to 10-5. "Check of LEV".
2.5 seconds OFF perature protection (50°C) or less for 20 minutes.
• 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
tor: TR821) or the bus-bar voltage reaches 320 V or more, PAM will be activated in the following cases:
Modulation
stops and restarts.
1 Instantaneous power voltage drop
(Short time power failure)
2 When the power supply voltage is high.
9-time flash
Inverter check mode The connector of compressor is disconnected, inverter check
• Check if the connector of the compres2.5 seconds OFF
mode starts.
sor is correctly connected. Refer to
10-5. "How to check inverter/compressor".
LED indication
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
ON
OFF
2.5-second OFF
Inverter P.C. board (Parts side)
LED
2.5-second 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
Defrost thermistor (RT61)
(MUZ)
Fin temperature
thermistor (RT64)
Measure the resistance with a tester.
Ambient temperature
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
thermistor (RT65)
board”, for 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.
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))
Compressor
U-V
U-W
V-W
GE09
Normal (Ω)
GE12
GE15/18
1.36 ~ 1.93
1.52 ~ 2.17
0.78 ~ 1.11
WHT
Color of lead wire
RED – BLK
BLK – WHT
WHT – RED
Normal (Ω)
GE15
GE09/12
28 ~ 40
RED BLK
W
V
Measure the resistance between lead wires using a tester.
(Temperature: 14 ~ 104°F(-10 ~ 40°C))
Outdoor fan motor
Figure
WHT
U
RED BLK
W
GE18
11 ~ 16
V
U
Measure the resistance using a tester.
(Temperature: 14 ~ 104°F(-10 ~ 40°C))
Normal (kΩ)
0.97 ~ 1.38
Measure the resistance using a tester.
(Temperature: 14 ~ 104°F(-10 ~ 40°C))
Normal (Ω)
WHT
LEV
RED
ORN
28
BLU
37 ~ 54
YLW
Expansion valve coil
(LEV)
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
BRN
R. V. coil (21S4)
(MUZ)
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 the voltage between terminals.
Are the voltages balanced?
Yes
No
Replace the inverter P.C. board.
See 10-5.
Check the compressor.
“Check of open phase”.
“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 OPERATION: Refer to 7-6.)
<<Measurement point>>
at 3 points
BLK (U) - WHT (V)
Measure AC voltage between the lead wires at 3 points.
BLK (U) - RED (W)
WHT(V) - RED (W)
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?
Yes
Refer to 10-5. “Check of compressor
operation time”.
Does the compressor operate continuously?
Yes
No
No
Replace the compressor.
Refer to 10-5.
OK.
29
“Check of compressor start failure”.
D Check of compressor winding
● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance between the compressor terminals.
<<Measurement point>>
at 3 points
BLK - WHT
Measure the resistance between the lead wires at 3 points.
BLK - RED
WHT - RED
<<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>>
●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.
0 second
Compressor starts
1 second
Abnormal
(IPM failure)
(Compressor winding short)
2 seconds
Abnormal
(Compressor lock out)
(Starting defect)
10 seconds
Abnormal
(Poor contact,)
(Outdoor P.C. board defect)
(Disconnected connector)
Abnormal
(Refrigerant circuit defect)
(Closed valve)
10 minutes
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
Does the compressor run for 10 seconds or
more after it starts?
Yes
Check the refrigerant circuit.
Check the stop valve.
No
After the compressor is heated with a drier,
does the compressor start? 1
No
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.)
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
No
Replace the inverter P.C. board.
OK.
(Cause is poor contact.)
Thermistor
Symbol
Connector, Pin No.
Defrost (MUZ)
RT61 Between CN641 pin1 and pin2
Discharge temperature
RT62 Between CN641 pin3 and pin4
Fin temperature
RT64 Between CN642 pin1 and pin2
Ambient temperature
RT65 Between CN643 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3
H Check of R.V. coil
Board
Inverter P.C. board
(MUZ)
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4.
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?
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 (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?
No
Replace the 4-way valve.
31
Replace the inverter
Yes P.C. board.
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.)
Yes
No
Replace the outdoor fan motor.
Replace the inverter P.C. board.
MUZ-GE18NA MUY-GE18NA
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
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
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.
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.
Does The upper lamp of
OPERATION INDICATOR 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.
Yes
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
Dose LED on the inverter P.C.
board light up or flash? (Refer
to 10-6.1.)
Yes
If light up, OK.
If flash, refer to 10-3.
No
No
Replace the indoor
electronic control P.C.
board.
Replace the inverter
P.C. board.
260-325 VDC
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·······"?
Do you feel the expansion valve vibrate
on touching it ?
No
Is LEV coil properly fixed to
the expansion valve?
No
Yes
Does the resistance of LEV
coil have the characteristics? Yes
(Refer to 10-4.)
No
Replace the LEV coil.
Yes
OK.
Properly fix the LEV coil to the expansion valve.
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.
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
No
Replace the inverter P.C.
board.
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?
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 LED indication on the inverter P.C. board.
Does the LED flash 10 times?
Yes
(10-time flash)
No
Check the remedy following LED
indication.
(Refer to 10-3.)
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.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
No
Check the wiring.
Press EMERGENCY OPERATION switch once.
Does the OPERATION INDICATOR lamp light
up? <Confirmation of the power to the indoor
unit>
Yes
Is serial signal error indicated 6 minutes later?
No
No
Yes
A
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connecting wire?
No
Yes
Correct them.
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm 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.
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
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.)
No
Check of power supply.
(Refer to 10-5. .)
Yes
Does the LED on the inverter P.C. board or the outdoor electronic control P.C.
board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3
Yes
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there rated voltage between indoor terminal block S1 and S2?
<Confirmation of power voltage>
No
Yes
Is there amplitude of 10 to 20 VDC between indoor terminal block S2
and S3? <Confirmation of serial signal>
No
(Lighted
or not
lighted)
Replace the inverter P.C. board or the outdoor
electronic control P.C. board. 2
2. Be careful of the residual voltage of smoothing
capacitor.
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.
No
Yes
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
B
• Reinstall
either the unit
or the light
away from
each other.
• Attach a filter
No on remote
control receiving section
of the indoor
unit.
Is there 2 VDC or less between CN10A (+)
and JPG (GND)(-) on the indoor electronic
control P.C. board?
No
Yes
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
No
Yes
Replace the indoor power
P.C. board and the indoor
terminal P.C. board
36
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
No
Replace the indoor electronic control P.C. board.
Yes
N Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Yes
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.?
Ground the unit.
No
Yes
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Yes
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
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
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.?
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
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 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.
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
(C63)
Bus-bar voltage
DB61
DC 260-325 V
(-)
(+)
Back side of unit
Smoothing
capacitor
(C62)
Smoothing
capacitor
(C61)
Fuse (F701)
T3.15 AL 250 V
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,
LDW)
100
Discharge temperature
thermistor/RT62
(CN641)
Defrost thermistor
/RT61(CN641)(MUZ)
Ambient temperature
thermistor/RT65
(CN643)
Outdoor heat exchanger
temperature thermistor
/RT68 (CN644)
Fin temperature
thermistor/RT64
(CN642)
Front side of unit
Output to drive outdoor
fan motor (CN932)
AC 208/
230 V
LED LEV
Jumper wire for
connector changing defrost
(CN724) setting (JS)(MUZ)
Defrost thermistor(RT61) (MUZ)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
200
80
160
Discharge temperature thermistor(RT62)
60
600
50
40
30
20
10
14
32 50 68 86
Temperature(°F)
104
140
Resistance(kΩ)
70
700
Resistance(kΩ)
Resistance(kΩ)
Fin temperature thermistor(RT64)
180
90
0
-4
Jumper wire
for pre-heat
control setting
(JK)
500
400
300
120
100
80
60
200
40
100
20
0
32
50
68
86 104 122 140 158 176 194 212 230 248
Temperature(°F)
38
0
32 50 68 86 104 122 140 158 176
Temperature(°F)
MUZ-GE18NA MUY-GE18NA
Back side of unit
Smoothing
Bus-bar voltage
capacitor
DB61
(C63)
DC 260-325 V
(-)
(+)
Smoothing
capacitor
(C62)
AC 208/230 V
Smoothing
capacitor
(C61)
Fuse (F801)
250 V 3.15 A
R.V.coil
Fuse (F701)
(CN721)
T3.15 AL 250 V 208/230
VAC
(MUZ)
Fuse (F901)
T3.15 AL 250 V
Output to
drive
compressor
(LDU,
LDV,
LDW)
100
Defrost thermistor(RT61) (MUZ)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
200
80
Jumper wire for pre-heat
control setting (JK)
Jumper wire for changing
defrost setting (JS)(MUZ)
LED
160
Discharge temperature thermistor(RT62)
60
600
50
40
30
20
10
14
32 50 68 86
Temperature(°F)
104
140
Resistance(kΩ)
70
700
Resistance(kΩ)
Resistance(kΩ)
Fin temperature thermistor(RT64)
180
90
0
-4
LEV connector (CN724)
Signal of outdoor fan
motor (CN931)
Output to drive outdoor
fan motor (CN932)
Discharge temperature
thermistor /RT62
(CN641)
Defrost thermistor
/RT61(CN641)(MUZ)
Ambient temperature
thermistor /RT65
(CN643)
Outdoor heat exchanger
temperature thermistor
/RT68(CN644)
Front side of unit
Fin temperature
thermistor /RT64
(CN642)
AC 208/
230 V
500
400
300
120
100
80
60
200
40
100
20
0
32
50
68
86 104 122 140 158 176 194 212 230 248
Temperature(°F)
39
0
32 50 68 86 104 122 140 158 176
Temperature(°F)
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.
Sleeve
Locking lever
(2) The terminal with this connector has the
locking mechanism.
Slide the sleeve.
Pull the terminal while
pushing the locking
lever.
Hold the sleeve, and
pull out the terminal
slowly.
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
Photo 1
1. Removing the cabinet
(1)
(2)
(3)
(4)
(5)
Remove the screw fixing the service panel.
Pull down the service panel and remove it.
Remove the screws fixing the conduit cover.
Remove the conduit cover.
Disconnect the power supply wire and indoor/outdoor
connecting wire.
(6) Remove the screws fixing the top panel.
(7) Remove the top 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.
Screws
of the top
panel
Screw of the
cabinet
Screws of
the top panel
Back
panel
Screw of
the service
panel
Photo 2
Hooks
Screw of the
conduit cover
Screws of
the cabinet
Conduit cover
Conduit plate
40
Service
panel
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:
<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 relay panel from the inverter assembly.
(8) Remove the inverter P.C. board from the relay panel.
Photo 3
Screws of the
relay panel
Photo 4 (Inverter assembly)
Heat sink
Inverter
P.C. board
Screw of the
T.B.support
T.B.support
3. Removing R.V. coil (MUZ)
(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)
Relay panel
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>
CN641 (Defrost thermistor (MUZ) 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.
41
Photo 5
Screw of the
ground wire
R.V. coil (MUZ)
Discharge temperature thermistor
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 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.
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
Propeller nut
Photo 8
Welded parts of 4-way valve
42
11-2. MUZ-GE18NA MUY-GE18NA
NOTE: Turn OFF power supply before disassembling.
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Remove the screws of the service panel.
Remove the screws of the top panel.
Remove the screw of the valve cover.
Remove the service panel.
Remove the top panel.
Remove the valve cover.
Disconnect the power supply and indoor/outdoor connecting 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.
Screw of the top panel
Screws of the cabinet
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
43
Screws of
the back
panel
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, inverter P.C. board
Photo 3
Screws of the
relay panel
(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) (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)
Heat sink
Hook of the
PB 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) (MUZ)
(3) Remove the R.V. coil. (Photo 5)
Inverter P.C.
board
Screw of the
T.B.support
PB support
Relay panel
Screw of the
Hook of the
PB fixture
PB support
T.B.support
Screw of the
ground wire
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 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>
CN641 (Defrost thermistor (MUZ) 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 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)
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.
Defrost thermistor
(MUZ)
Photo 7
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.)
(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)
Photo 8
Welded part of the
discharge pipe
Discharge temperature
thermistor
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.