Mitsubishi Electronics Muy Ge18na User Manual

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 nish  
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 nish  
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  
3.0 × 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  
3.6  
(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  
Airow (High)  
DB  
Intake air temperature  
WB  
°F  
43  
43  
Fan speed  
rpm  
CFM  
800  
850  
1225  
900  
860  
1172  
Airow  
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  
Airow (High)  
DB  
Intake air temperature  
WB  
°F  
43  
43  
Fan speed  
rpm  
CFM  
910  
900  
1,229  
780  
740  
1,659  
Airow  
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 nish 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.  
Conrm 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 conrm the abnormal point with the indoor unit  
failure mode table. (Refer to indoor unit service manual.)  
Check the blinking pattern, and conrm 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.  
Conrm if outdoor unit is abnormal according to the following procedures.  
Conrm 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 conrm 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 ash 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 ash Discharge temperature  
1-time ash every  
Thermistor shorts or opens during  
compressor running.  
•Refer to 10-5. "Check  
of outdoor thermistors".  
Defective outdoor  
thermistors can be  
identied by checking  
the blinking pattern of  
LED.  
2.5 seconds thermistor  
2.5 seconds  
OFF  
Defrost thermistor (MUZ)  
Fin temperature thermistor  
3-time ash  
2.5 seconds OFF  
P.C. board temperature  
thermistor  
4-time ash  
2.5 seconds OFF  
Ambient temperature  
thermistor  
2-time ash  
2.5 seconds OFF  
4-time ash Overcurrent  
2.5 seconds  
OFF  
11-time ash  
2.5 seconds OFF  
Large current ows into intelligent  
power module.  
•Reconnect compressor  
connector.  
•Refer to 10-5. "How  
to check inverter/  
compressor".  
•Check stop valve.  
Compressor synchronous  
12-time ash  
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 ash 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 ash 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 ash Fin temperature/ P.C. board  
2.5 seconds temperature  
OFF  
7-time ash  
2.5 seconds OFF  
Temperature of n 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 ash 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 ash Nonvolatile memory data  
5-time ash  
2.5 seconds OFF  
Nonvolatile memory data cannot be  
read properly.  
•Replace the inverter  
P.C. board.  
2.5 seconds  
OFF  
10-time ash 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 ash DC voltage  
8-time ash  
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 ash  
2.5 seconds OFF  
Each phase current of compressor  
cannot be detected normally.  
compressor  
12-time ash Overcurrent Compressor open- 10-time ash  
Large current ows 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 ash Stop valve (Closed valve)  
2.5 seconds  
OFF  
14-time ash  
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 ash 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, n 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 ashes 7 times.)  
6-time ash  
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 ash  
Closed valve is detected by compressor current.  
•Check stop valve.  
2.5 seconds OFF Closed valve  
14-time ash 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 ash  
unit stops 2.5 seconds OFF tion  
Overcurrent protec- Large current ows 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 ash  
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 ash  
Fin temperature /P.C. Temperature of n 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 ash  
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 ash  
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 ash  
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 ash  
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 ash  
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 ash  
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 lters are clogged.  
•Check if refrigerant is short.  
•Check if indoor/outdoor unit air circula-  
tion is short cycled.  
3-time ash  
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 ash  
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 ash  
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 ash  
PAM protection PAM: The overcurrent ows 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 ash  
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 gure. Refer to 10-6.1.  
2. LED is lighted during normal operation.  
The ashing frequency shows the number of times the LED blinks after every 2.5-second OFF. Flashing  
(Example) When the ashing 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 ashes 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  
Conrm 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 ash? (Refer  
to 10-6.1.)  
Replace the inverter  
P.C. board.  
Yes  
Yes  
No  
260-325 VDC  
If light up, OK.  
If ash, 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 xed to  
the expansion valve?  
Properly x 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 ash 10 times?  
No  
Yes  
(10-time ash)  
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? <Conrmation 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 conrm 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?  
<Conrmation of power voltage>  
No  
No  
Yes  
Is there amplitude of 10 to 20 VDC between indoor terminal block S2  
and S3? <Conrmation 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 lter  
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 fullled, the electromagnetic noise may enter, depending on the electric eld strength  
or the installation condition (combination of specic 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 eld intensity of the broadcast station affected by the electromagnetic noise  
6. Presence or absence of amplier 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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