Mitsubishi MUZ-GE24NA, MUZ-GE12NA, MUY-GE09NA, MUY-GE12NA, MUY-GE15NA Service Manual

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Page 1
SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
Revision B:
Descriptions regarding the outdoor fan motor
have been corrected.
Please void OBH549 REVISED EDITION-A.
SERVICE MANUAL
Models
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA
HFC
utilized
R410A
Indoor unit service manual
MSZ-GE•NA MSY-GE•NA Series (OBH548)
No. OBH549
REVISED EDITION-B
MUZ-GE09/12/15NA MUY-GE09/12/15NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. OUTLINES AND DIMENSIONS ························ 8
5. WIRING DIAGRAM ·········································· 10
6. REFRIGERANT SYSTEM DIAGRAM ············· 15
8. ACTUATOR CONTROL ··································· 30
9. SERVICE FUNCTIONS ··································· 31
10. TROUBLESHOOTING ····································· 31
11. DISASSEMBLY INSTRUCTIONS ···················· 49
PARTS CATALOG (OBB549)
TM
Page 2
Revision A:
MUZ-GE24NA and MUY-GE24NA have been added.
Revision B:
Descriptions regarding the outdoor fan motor have been corrected.
1
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA
1. New model
TECHNICAL CHANGES
2
Page 3
Piping
Air outlet
Drain hose
Drain outlet
Air inlet
(back and side)
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
MUZ-GE24NA MUY-GE24NA
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
3
Page 4
3
Outdoor unit model MUZ-GE09NA MUY-GE09NA MUZ-GE12NA MUY-GE12NA
Capacity
Rated (Minimum~Maximum)
Capacity Heating 17 2 Btu/h 8,700
Power consumption
Rated (Minimum~Maximum)
Power consumption Heating 17 EER HSPF IV COP Heating 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
Compressor
Refrigerant control Linear expansion valve
Sound level
Defrost method Reverse cycle
Dimensions
Weight Ib. 66 77 External fi nish Munsell 3Y 7.8/1.1 Remote controller Wireless type Control voltage Refrigerant piping Not supplied
Refrigerant pipe size (Min. wall thickness)
Connection method
Between the indoor & outdoor units
Refrigerant charge (R410A) 1 lb. 12 oz. 2 lb. 9 oz.
NOTE: Test conditions are based on AHRI 210/240.
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 2: (Heating) Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB Maximum frequency
SPECIFICATION
Cooling
Heating 47
Cooling 1 W Heating 47 1 W
1
[SEER] 3 Cooling 13.6 [ 21.0 ] 13.6 [ 21.0 ] 12.5 [ 20.5 ] 12.5 [ 20.5 ]
4 Heating 10.0 10.0
Model KNB073FQDHC
Refrigeration oil (Model)
1
Cooling dB(A) 46 46 49 49 Heating dB(A) 50 51
W in. 31-1/2 D in. 11-1/4 H in. 21-5/8
(by built-in transformer)
Liquid in. 1/4 (0.0315) Gas in. 3/8 (0.0315) Indoor Flared Outdoor Flared Height difference ft. 40 Piping length ft. 65
1 Btu/h
1 Btu/h
2 W 950 1,200
1 4.20 3.61
R.L.A 6.6 4.9 6.6 4.9 L.R.A 8.2 6.1 8.2 6.1
L 0.32 (NEO22)
VDC 12 - 24
9,000
( 3,800 ~ 12,200 )
10,900
( 4,500 ~ 14,100 )
660 (205~1,200) 660 (205~1,200) 960 (205~1,300) 960 (205~1,300) 760 (255~1,200)
9,000
( 3,800 ~ 12,200 )
12,000
( 3,800 ~ 13,600 )
14,400
( 5,500 ~ 18,100 )
11,200
1,170 (340~1,660)
KNB092FQAHC
12,000
( 3,800 ~ 13,600 )
4
Page 5
Outdoor unit model MUZ-GE15NA MUY-GE15NA MUZ-GE18NA MUY-GE18NA
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h
Heating 47 1 Btu/h
Capacity Heating 17
Power consumption
Rated (Minimum~Maximum)
Cooling 1 W Heating 47 1 W
Power consumption Heating 17
1
EER
[SEER] 3 Cooling 13.0 [ 21.0 ] 13.0 [ 21.0 ] 10.5 [19.2] 10.5 [19.2]
14,000
( 3,100 ~ 18,200 )
18,000
( 4,800 ~ 20,900 )
2 Btu/h 15,900
1,080 (160 ~ 2,000) 1,080 (160 ~ 2,000) 1,640 (240 ~ 2,070) 1,640 (240 ~ 2,070) 1,600 (270 ~ 2,010)
2 W 1,950 2,080
14,000
( 3,100 ~ 18,200 )
17,200
( 3,700 ~ 18,700 )
21,600
( 3,500 ~ 25,200 )
17,200
1,900 (230 ~ 2,680)
17,200
( 3,700 ~ 18,700 )
HSPF IV 4 Heating 10.0 10.0 — COP Heating
1 3.30 3.33 — 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
Refrigeration oil (Model)
L.R.A 9.3 8.5 12.5 12.5
L 0.45 (NEO22)
Refrigerant control Linear expansion valve
Sound level
1
Cooling dB(A) 49 49 54 54 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 fi nish Munsell 3Y 7.8/1.1 Remote controller Wireless type Control voltage
(by built-in transformer)
VDC 12 - 24
Refrigerant piping Not supplied
Refrigerant pipe size (Min. wall thickness)
Connection method
Between the indoor & outdoor units
Liquid in. 1/4 (0.0315) Gas in. 1/2 (0.0315) Indoor Flared Outdoor Flared Height difference ft. 40 50 Piping length ft. 65 100
Refrigerant charge (R410A) 2 lb. 9 oz. 3 lb. 7 oz.
NOTE: Test conditions are based on AHRI 210/240.
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 2: (Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB Maximum frequency
5
Page 6
Outdoor unit model MUZ-GE24NA MUY-GE24NA
Capacity
Rated (Minimum~Maximum)
Cooling 1 Btu/h
Heating 47 1 Btu/h
Capacity Heating 17
Power consumption
Rated (Minimum~Maximum)
Cooling 1W Heating 47 1 W
22,500
(8,200 ~ 31,400)
27,600
(7,500 ~ 36,900)
2 Btu/h 24,600
1,800 (570 2,340 (520
~ 3,580) ~ 3,650)
22,500
(8,200 ~ 31,400)
1,800 (570
~ 3,580)
Power consumption Heating 17 2 W 3,290
1
EER
[SEER] 3 Cooling 12.5 [19.0] 12.5 [19.0] HSPF IV 4 Heating 10.0 — COP Heating
1 3.46 — Power supply V , phase , Hz 208/230 , 1 , 60 Max. fuse size (time delay) A 20 Min. circuit ampacity A 17.1 Fan motor F.L.A 0.93
Model SNB172FQKMT
R.L.A 12.9
Compressor
Refrigeration oil (Model)
L.R.A 16.1
L 0.40 (FV50S)
Refrigerant control Linear expansion valve
Sound level
1
Cooling dB(A) 55 55 Heating dB(A) 55
Defrost method Reverse cycle
W in. 33-1/16
Dimensions
D in. 13 H in. 34-5/8
Weight Ib. 119 External fi nish Munsell 3Y 7.8/1.1 Remote controller Wireless type Control voltage
(by built-in transformer)
VDC 12-24
Refrigerant piping Not supplied
Refrigerant pipe size (Min. wall thickness)
Connection method
Between the indoor & outdoor units
Liquid in. 3/8 (0.0315) Gas in. 5/8 (0.0315) Indoor Flared Outdoor Flared Height difference ft. 50 Piping length ft. 100
Refrigerant charge (R410A) 4 lb. 3 oz.
NOTE: Test conditions are based on AHRI 210/240.
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 2: (Heating) Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB Maximum frequency
6
Page 7
7
Test condition
3, 4
Mode Test
ARI
"A-2" Cooling Steady State at rated compressor Speed
"B-2" Cooling Steady State at rated compressor Speed
SEER
(Cooling)
HSPF
(Heating)
(MUZ)
5
: At Intermediate compressor Speed
"B-1" Cooling Steady State at minimum compressor Speed
"F-1" Cooling Steady State at minimum compressor Speed
"E-V" Cooling Steady State at Intermediate compressor Speed 5
"H1-2" Heating Steady State at rated compressor Speed
"H3-2" Heating at rated compressor Speed
"H0-1" Heating Steady State at minimum compressor Speed
"H1-1" Heating Steady State at minimum compressor Speed
"H2-V" Heating at Intermediate compressor Speed
5
= ("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
Indoor air condition (°F) Outdoor air condition (°F)
Dry bulb Wet bulb Dry bulb Wet bulb
80 67 95 (75)
80 67 82 (65)
80 67 82 (65)
80 67 67 (53.5)
80 67 87 (69)
70 60 47 43
70 60 17 15
70 60 62 56.5
70 60 47 43
70 60 35 33
3-1. OPERATING RANGE
(1) POWER SUPPLY
Outdoor unit
(2) OPERATION
Mode Condition
Standard temperature 80 67 95
Cooling
Heating
(MUZ)
Maximum temperature 90 73 115 — Minimum temperature 67 57 14 — Maximum humidity 78 % — Standard temperature 70 60 47 43 Maximum temperature 80 67 75 65 Minimum temperature 70 60 -4 -5
Rated voltage Guaranteed voltage (V)
208/230 V
1 phase
60 Hz
Min. 187
Indoor Outdoor
DB WB DB WB
208 230 Max. 253
Intake air temperature (°F)
Page 8
4
OUTLINES AND DIMENSIONS
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUY-GE09NA MUY-GE12NA MUY-GE15NA
21-5/8
1-3/4
Air in
handle
11-1/32
7/8
13/32
15-3/4
Air in
11-29/32
5-15/16
Air out
19-11/16
31-1/2
Drain hole 1-5/8
1-9/16
2- 3/8 13/16 Oval hole
11/ 16
2
2-23/32
13-9/16
12 ~ 12-3/4
5-7/8
REQUIRED SPACE
4 i
n. or more
17/3229/32 11-1/4
Open two sides of left, right, or rear side.
Liquid pipe :1/4 (flared) Gas pipe :3/8 (flared) (GE09/12)
6-23/32
1/2 (flared) (GE15)
8 in. or
Basically open 4 inch or more without any obstruction in front and on both sides of the unit.
4 in. or more
re
mo
Unit: inch
14 in. or more
MUZ-GE18NA MUY-GE18NA
Drain 3 holes (ø1
-5/16)
2
Air in
13
33-7/16
11-25/32
2-19/32
20-9/32
Air out
4-25/32
Air in
1-11/32
19-11/16
33-1/16
1-9/16
4-3/8
×
13/16 slot
3-3/16
REQUIRED SPACE
4 in. or more
14-3/16
Open as a rule 20 inch or more if the back, both sides and top are open
Open as a rule 20 inch or more if the front and both sides are open
4 inch or more/ 8 inch or more if there are obstacles to both sides
14 in. or more
16-15/16
2-9/16
30°
35°
8-11/32
Liquid:1/4(flared) Gas :1/2(flared)
3-9/16
8
Page 9
16-7/16
1-9/16
1-5/8
Drain ho
le
6-7/8
19-11/16
13
2
Air in
Air out
2-holes 13/32 13/16
14-3/16
33-1/16
4-5/16
3-3/16
34-5/8
17-25/32
Service panel
3-29/32
6-1/2
7-11/16
35
44
Liquid refrigerant pipe joint Refrigerant pipe (flared)
Ø 3/8
Gas refrigerant pipe joint Refrigerant pipe (flared)
Ø 5/8
14 in. or more
4 in. or
more
REQUIRED SPACE
20 in. or more
4 in. or more
20 in. or more
MUZ-GE24NA MUY-GE24NA
Unit: inch
9
Page 10
5
MUZ-GE09NA MUZ-GE12NA
WIRING DIAGRAM
MUY-GE09NA MUY-GE12NA
10
Page 11
MUZ-GE15NA
MUY-GE15NA
11
Page 12
MUZ-GE18NA
MUY-GE18NA
12
Page 13
13
MUZ-GE24NA
Page 14
MUY-GE24NA
14
Page 15
Outdoor heat exchanger
Flared connection
Defrost thermistor RT61 (MUZ)
Discharge temperature thermistor RT62
Flared connection
Stop valve (with strainar)
Stop valve (with service port)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
(MUZ)
Refrigerant pipe ø3/8 (with heat insulator)
Refrigerant pipe ø1/4 (with heat insulator)
R.V. coil
(MUZ) heating ON cooling OFF
Strainer #100
LEV
Ambient temperature thermistor RT65
Muffler
Capillary tube
O.D. 0.118 × I.D. 0.079
× 9-7/16
(ø3.0 × ø2.0 × 240)
Outdoor heat exchanger temperature thermistor RT68
Service port
Service port
Muffler
Outdoor heat exchanger
Flared connection
Defrost thermistor RT61 (MUZ)
Discharge temperature thermistor RT62
Flared connection
Stop valve (with strainar)
Stop valve (with service port)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
(MUZ)
Refrigerant pipe ø3/8 (GE12NA) Refrigerant pipe ø1/2 (GE15NA) (with heat insulator)
Refrigerant pipe ø1/4 (with heat insulator)
R.V. coil
(MUZ) heating ON cooling OFF
Strainer #100
Capillary tube
O.D. 0.118 × I.D. 0.071
× 23-5/8
3.0
× ø
1.8×600
)
(×2)
LEV
Ambient temperature thermistor RT65
Muffler
Capillary tube
O.D. 0.118 × I.D. 0.079
× 9-7/16
(ø3.0 × ø2.0 × 240)
Outdoor heat exchanger temperature thermistor RT68
Muffler
Service port
Service port
6
REFRIGERANT SYSTEM DIAGRAM
MUZ-GE09NA MUY-GE09NA
Unit: inch
MUZ-GE12NA MUZ-GE15NA MUY-GE12NA MUY-GE15NA
15
Page 16
MUZ-GE18NA MUY-GE18NA
Outdoor heat exchanger
Flared connection
Defrost thermistor RT61
(MUZ)
Discharge temperature thermistor RT62
Flared connection
Stop valve (with strainar)
Stop valve (with service port)
Capillary tube
O.D. 0.142 × I.D. 0.094
× 1-31/32
3.6
×
ø
2.4×50)
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
(MUZ)
Refrigerant pipe ø1/2 (with heat insulator)
Refrigerant pipe ø1/4 (with heat insulator)
LEV
R.V. coil
(MUZ)
heating ON cooling OFF
Muffler
#100
Receiver
Outdoor heat exchanger temperature thermistor RT68
Ambient temperature thermistor RT65
Strainer
#100
Service port
Service port
Unit: inch
MUZ-GE24NA MUY-GE24NA
Refrigerant pipe (with heat insulator)
Flared connection
Refrigerant pipe ø3/8 (with heat insulator)
Flared connection
ø
5/8
Stop valve (with service port)
4-way valve
Service
Stop valve
port
Strainer
#100
Discharge temperature thermistor RT62
Capillary tube O.D.0.157
×
3-15/16
4.0
Muffler
#100
Service port
Defrost thermistor RT61 (MUZ)
Compressor
LEV
Strainer
#100
×
I.D.0.094
×
ø
2.4×100)
16
Outdoor heat exchanger
Outdoor heat exchanger temperature thermistor RT68
R.V. coil (MUZ) heating ON cooling OFF
Refrigerant flow in cooling Refrigerant flow in heating (MUZ)
Ambient temperature thermistor RT65
Page 17
17
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Refrigerant piping: ft. Piping size O.D: in.
Model
MUZ-GE09/12/15NA MUY-GE09/12/15NA
MUZ-GE18NA MUY-GE18NA
MUZ-GE24NA MUY-GE24NA
Max. Length
A
65 40
Max. Height difference
B
Gas Liquid
3/8 (GE09/12)
1/2 (GE15)
100 50 1/2
100 50 5/8 3/8
Indoor unit
Max. Height
difference
B
Max. Length A
Outdoor unit
ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)
NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
Model
MUZ-GE09NA MUY-GE09NA
MUZ-GE12NA MUY-GE12NA
MUZ-GE15NA MUY-GE15NA
Model
MUZ-GE18NA MUY-GE18NA
Outdoor unit
precharged
25 30 40 50 60 65
1 lb. 12 oz.
0 1.62 4.86 8.10 11.34 12.96
2 lb. 9 oz.
Outdoor unit
precharged
25 30 40 50 60 70 80 90 100
3 lb. 7 oz. 0 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20
Refrigerant piping length (one way): ft.
Calculation: X oz. = 1.62/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
Refrigerant piping length (one way): ft.
Calculation: X oz. = 1.08/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)
1/4
NOTE: Refrigerant piping exceeding 33 ft. requires additional refrigerant charge according to the calculation.
Model
MUZ-GE24NA MUY-GE24NA
Outdoor unit
precharged
33 40 50 60 70 80 90 100
4 lb. 3 oz. 0 4.14 10.06 15.98 21.90 27.82 33.74 39.66
Refrigerant piping length (one way): ft.
Calculation: X oz. = 2.96/5 oz. / ft. × (Refrigerant piping length (ft.) - 33)
Page 18
7
DATA
7-1. PERFORMANCE DATA
1) COOLING CAPACITY
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUY-GE09NA MUY-GE12VA MUY-GE15VA MUY-GE18VA MUY-GE24VA
Indoor air Outdoor intake air DB temperature (˚F)
Model
MUZ-GE09NA MUY-GE09NA
MUZ-GE12NA MUY-GE12NA
MUZ-GE15NA MUY-GE15NA
MUZ-GE18NA MUY-GE18NA
MUZ-GE24NA MUY-GE24NA
NOTE: 1. IWB: Intake air wet-bulb temperature
2. SHC is based on 80˚F of indoor Intake air DB temperature.
IWB (˚F)
71 11.0 7.6 0.59 10.3 7.1 0.64 9.7 6.6 0.69 9.0 6.2 0.73 8.3 5.7 0.76 67 10.4 8.6 0.55 9.7 8.0 0.61 9.0 7.4 0.66 8.4 6.9 0.70 7.7 6.3 0.73 63 9.8 9.4 0.53 9.1 8.7 0.58 8.5 8.1 0.63 7.7 7.3 0.67 7.0 6.7 0.70 71 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 67 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 63 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 8.2 1.02 71 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 67 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 63 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 71 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 67 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 63 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 71 27.6 17.0 1.60 25.8 15.9 1.76 24.2 14.9 1.89 22.5 13.9 1.99 20.7 12.8 2.07 67 26.1 19.6 1.51 24.3 18.2 1.67 22.5 16.9 1.80 20.9 15.7 1.91 19.2 14.4 2.00 63 24.5 21.7 1.44 22.7 20.1 1.59 21.2 18.7 1.72 19.2 17.0 1.84 17.6 15.5 1.91
TC: Total Capacity (×10 SHC: Sensible Heat Capacity (×10 TPC: Total Power Consumption (kW)
75 85 95 105 115
TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC
3
Btu/h)
3
Btu/h)
2) COOLING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.) 40 65 100
MUZ-GE09NA MUY-GE09NA MUZ-GE12NA MUY-GE12NA MUZ-GE15NA MUY-GE15NA MUZ-GE18NA MUY-GE18NA
MUZ-GE24NA MUY-GE24NA
1.0 0.954 0.878
1.0 0.954 0.878 0.771
18
Page 19
3) HEATING CAPACITY (MUZ)
Indoor air Outdoor intake air WB temperature (˚F)
Model
IDB (˚F)
5 152535434555
TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC
75 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
MUZ-GE09NA
70 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 65 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 75 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
MUZ-GE12NA
70 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 65 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 75 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
MUZ-GE15NA
70 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 65 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 75 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
MUZ-GE18NA
70 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 65 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 12.1 1.38 16.0 1.74 20.0 2.05 23.9 2.28 26.9 2.40 27.7 2.43 31.5 2.53
MUZ-GE24NA
70 13.1 1.32 17.0 1.68 20.7 2.00 24.4 2.22 27.6 2.34 28.4 2.39 32.2 2.48 65 13.8 1.26 17.4 1.61 21.7 1.93 25.3 2.16 28.4 2.28 29.3 2.32 32.8 2.43
NOTE: 1. IDB: Intake air dry-bulb temperature TC: Total Capacity (x10
3
Btu/h)
TPC: Total Power Consumption (kW)
2. Above data is for heating operation without any frost.
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
1.5
1.4
1.3
1.2
1.1
difference (°F)
1.0
Capacity correction factors
0.9
Indoor air Wet-bulb temperature
14 23 32 41 50 59 68 77 86 95 104 113
Cooling capacity (
Outdoor intake air Dry-bulb temperature(°F)
at Rated frequency)
Indoor intake air Wet-bulb temperature( F)
79
75
72 68 64
MUZ-GE09NA MUY-GE09NA
SHF at rating condition = 0.76
0.8
0.7
Indoor
(kW)
0.6
0.5
Total power consumption
65 75 85 95 105 115
Outdoor intake air DB temperature (°F)
e air WB temperat
intak
Airflow
= 307 CFM
ure (°F)
MUZ-GE12NA MUY-GE12NA
SHF at rating condition = 0.73
1.3
71 67 63
1.2
1.1
1.0
(kW)
0.9
0.8
0.7
Total power consumption
oor intake air WB temperature (°F)
Ind
65 75 85 95 105 115
Outdoor intake air DB temperature (°F)
19
Airflow
= 350 CFM
71 67 63
Page 20
75 70 65
Indoor intake air DB temperature (°F)
= 413 CFM
Airflow
155253545556570
Outdoor intake air WB temperature (°F)
0.4
0.6
0.8
1.0
1.1
Total power consumption
(kW)
Indoor air Dry-bulb temperature
difference (°F)
Outdoor intake air Wet-bulb temperature (°F)
-4 5 142332415059
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
Heating capacity (
at Rated frequency)
Capacity correction factor
59
68
79
Indoor intake air Dry-bulb temperature
( F)
MUZ-GE15NA MUY-GE15NA
1.4
1.3
1.2
1.1
(kW)
1.0
0.9
0.8
Total power consumption
SHF at rating condition = 0.80
Indoor intake air WB temperature (°F)
65 75 85 95 105 115
Outdoor intake air DB temperature (°F)
Airflow
= 498 CFM
MUZ-GE24NA MUY-GE24NA
SHF at rating condition = 0.75
2.2
2.1
2.0
1.9
1.8
1.7
(kW)
1.6
1.5
1.4
Total power consumption
1.3 65 75 85 95 105 115
Indoor intake air WB temperature (°F)
Outdoor intake air DB temperature (°F)
Airflow
= 634 CFM
Heating (MUZ)
MUZ-GE18NA MUY-GE18NA
SHF at rating condition = 0.71
2.0
71 67 63
71 67 63
1.9
1.8
1.7
1.6
(kW)
1.5
1.4
1.3
Total power consumption
65 75 85 95 105 115
Indoor intake air WB temperature (°F)
Outdoor intake air DB temperature (°F)
Airflow
= 498 CFM
71 67
63
MUZ-GE09NA
MUZ-GE12NA
1.4
1.3
1.2
1.1
1.0
0.9
(kW)
0.8
0.7
0.6
Total power consumption
0.5
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.
155253545556570
= 413 CFM
Airflow
Indoor intake air DB temperature (°F)
Outdoor intake air WB temperature (°F)
MUZ-GE15NA
= 463 CFM
1.9
75 70 65
1.8
1.5
1.2
(kW)
0.9
Total power consumption
0.6 155253545556570
Outdoor intake air WB temperature (°F)
20
Airflow
oor intake air DB temperature (°F)
Ind
75 70 65
Page 21
21
68 70 75 80 85 90 95 100 105
(°F)
120
140
160
180
200
(PSIG)(PSIG)
6870 75 80 85 90
95
100 105
(°F)
280
320
360
400
440
Condensing pressure
86 80 75 70
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
Outdoor ambient temperature
Indoor DB temperature (°F)
86
80
75
70
MUZ-GE18NA
2.1
1.9
1.7
1.5
1.3
(kW)
1.1
0.9
0.7
Total power consumption
0.5 155253545556570
= 463 CFM
Airflow
Indoor intake air DB temperature (°F)
Outdoor intake air WB temperature (°F)
75 70 65
MUZ-GE24NA
2.8
2.5
2.2
1.9
(kW)
1.6
1.3
Total power consumption
1.0 5 15253545556570
= 738 CFM
Airflow
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.
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
75 70 65
MUZ-GE12NA MUY-GE12NA
(PSIG)
420
380
340
Condensing pressure
300
260
Indoor DB temperature (°F)
6870 75 80 85 90
Outdoor ambient temperature
95
100 105
(PSIG)
86 80 75 70
190
170
150
Suction pressure
Indoor DB temperature (°F)
130
(°F)
110
6870 75 80 85 90
Outdoor ambient temperature
95
100 105
86
80
75
70
(°F)
Page 22
MUZ-GE15NA MUY-GE15NA
(PSIG) (PSIG)
68 70 75 80 85 90 95 100
105
(°F)
120
140
160
180
200
6870 75 80 85 90
95
100 105(°F)
280
320
360
400
440
Condensing pressure
86 80 75 70
Suction pressure
Outdoor ambient temperature
Indoor DB temperature (°F)
Outdoor ambient temperature
Indoor DB temperature (°F)
86
80
75
70
(PSIG)
6870 75 80 85 90
95
100
105
(°F)
270
310
350
390
430
(PSIG)
6870 75 80 85 90
95
100
105
(°F)
100
115
130
145
160
Condensing pressure
86 80
75 70
Suction pressure
Indoor DB temperature (°F)
Outdoor ambient temperature
86
80
75 70
Indoor DB temperature (°F)
Outdoor ambient temperature
MUZ-GE18NA MUY-GE18NA
MUZ-GE24NA MUY-GE24NA
(PSIG)
480
450
420
390
360
330
Condensing pressure
300
270
6870 75 80 85 90
Indoor DB temperature (°F)
Outdoor ambient temperature
95
100 105
86 80 75
(°F)
(PSIG)
180
70
170
160
150
140
Suction pressure
130
120
110
6870 75 80 85 90
Outdoor ambient temperature
Indoor DB temperature (°F)
22
95
100 105
86
80
75
70
(°F)
Page 23
23
Heating (MUZ)
5 15253545556575(°F) 5 15253545556575(°F)
60
85
110
135
160
185
210
260
300
340
380
420
460
Indoor DB temperature (°F)
Condensing pressure
Outdoor ambient temperature
(PSIG) (PSIG)
75 70
65
58Hz
Indoor DB temperature (°F)
Suction pressure
Outdoor ambient temperature
75 70
65
58Hz
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
345
75 70 65
210
185
75 70 65
320
295
270
Condensing pressure
245
220
5 15253545556575(°F) 5 15253545556575(°F)
MUZ-GE12NA
Indoor DB temperature (°F)
Outdoor ambient temperature
58Hz
160
135
110
Suction pressure
85
60
Indoor DB temperature (°F)
58Hz
Outdoor ambient temperature
MUZ-GE15NA
(PSIG) (PSIG)
440
404
368
332
Condensing pressure
296
260
Indoor DB temperature (°F)
5 15253545556575(°F) 5 15253545556575(°F)
Outdoor ambient temperature
54Hz
75 70 65
210
185
160
135
110
Suction pressure
85
60
Indoor DB temperature (°F)
Outdoor ambient temperature
54Hz
75 70 65
Page 24
MUZ-GE18NA
5 15253545556575(°F) 75(°F)
250
275
300
325
350
375
400
425
450
5 152535455565
50
70
90
110
130
150
170
190
210
Ind
oor DB temperature (°F)
Condensing pressure
Outdoor ambient temperature
(PSIG) (PSIG)
75 70 65
58Hz
Indoor DB temperature (°F)
Suction pressure
Outdoor ambient temperature
75 70
65
58Hz
(PSIG) (PSIG)
500
475
450
425
75
65
70
210
185
160
75 70 65
400
375
Condensing pressure
350
325
300
5 15253545556575
MUZ-GE24NA
Indoor DB temperature (°F)
Outdoor ambient temperature
58Hz
(°F)
135
oor DB temperature (°F)
110
Suction pressure
85
60
5 15253545556575(°F)
Ind
58Hz
Outdoor ambient temperature
24
Page 25
25
7-4. STANDARD OPERATION DATA
Model
Item Unit Cooling Heating Cooling Heating
Capacity Btu/h 9,000 10,900 12,000 14,400
SHF - 0.82 0.74
Total
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 MSZ-GE12NA, MSY-GE12NA
Power supply (V, Phase, Hz) 208 / 230, 1, 60
Input kW 0.022 0.023 0.022 0.023
Fan motor current A 0.24/0.22 0.25/0.23 0.24/0.22 0.25/0.23
Outdoor unit
Power supply (V, phase, Hz) 208/230, 1, 60
Electrical circuit
Input 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
Suction pressure
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
Refrigerant circuit
Ref. pipe length ft. 25
Refrigerant charge (R410A) - 1 lb. 12 oz. 2 lb. 9 oz.
Intake air temperature
Discharge air temperature
Indoor unit
Fan speed (High) rpm 1,020 1,040 1,020 1,040
Airfl ow (High)
Intake air temperature
Fan speed rpm 800 850 900 860
Airfl ow
Outdoor unit
PSIG
PSIG
DB °F 80 70 80 70
WB °F 67 60 67 60
DB °F 60 97 56 108
WB °F 58 55
CFM
DB °F 95 47 95 47
WB °F 43 43
CFM
MSZ-GE09NA MSY-GE09NA
MUZ-GE09NA MUY-GE09NA
389 331 389 397
151 103 133 104
367 (Wet) 413 367 (Wet) 413
1151 1225 1229 1172
MSZ-GE09NA
MUZ-GE09NA
MSZ-GE12NA MSY-GE12NA
MUZ-GE12NA MUY-GE12NA
MSZ-GE12NA
MUZ-GE12NA
Page 26
Model
Item Unit Cooling Heating Cooling Heating
Capacity Btu/h 14,000 18,000 17,200 21,600
SHF - 0.80 0.71
Total
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 MSZ-GE18NA, MSY-GE18NA
Power supply (V, Phase, Hz) 208/230, 1, 60
Input kW 0.045 0.031 0.043 0.037
Fan motor current A 0.50/0.45 0.35/0.32 0.43/0.39 0.40/0.36
Outdoor unit
Power supply (V, phase, Hz) 208/ 230, 1, 60
Electrical circuit
Input 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
Suction pressure
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
Refrigerant circuit
Ref. pipe length ft. 25
Refrigerant charge (R410A) - 2 lb. 9 oz. 3 lb. 7 oz.
Intake air temperature
Discharge air temperature
Indoor unit
Fan speed (High) rpm 1,280 1,140 1,280 1,240
Airfl ow (High)
Intake air temperature
Fan speed rpm 910 900 780 740
Airfl ow
Outdoor unit
PSIG
PSIG
DB °F 80 70 80 70
WB °F 67 60 67 60
DB °F 60 114 56 117
WB °F 57 54
CFM
DB °F 95 47 95 47
WB °F 43 43
CFM
MSZ-GE15NA MSY-GE15NA
MUZ-GE15NA MUY-GE15NA
400 431 376 458
139 99 117 102
498 (Wet) 463 498 (Wet) 512
1,243 1,229 1,730 1,659
MSZ-GE15NA
MUZ-GE15NA
MSZ-GE18NA MSY-GE18NA
MUZ-GE18NA MUY-GE18NA
MSZ-GE18NA
MUZ-GE18NA
26
Page 27
27
Model
Item Unit Cooling Heating
Capacity Btu/h 22,500 27,600
SHF - 0.75
Total
Input kW 1.800 2.340
Rated frequency Hz 66.5 82.0
Indoor unit MSZ-GE24NA, MSY-GE24NA
Power supply (V, Phase, Hz) 208/230, 1, 60
Input kW 0.058
Fan motor current A 0.56/0.51
Outdoor unit
Power supply (V, phase, Hz) 208/230, 1, 60
Electrical circuit
Input kW 1.742 2.282
Comp. current A 7.01/6.34 9.59/8.67
Fan motor current A 1.61/1.05 1.13/1.02
Condensing pressure
Suction pressure
Discharge temperature °F 158 171
Condensing temperature °F 115
Suction temperature °F 52 33
Comp. shell bottom temp °F 140 148
Refrigerant circuit
Ref. pipe length ft. 25
Refrigerant charge (R410A) - 4 lb. 3 oz.
Intake air temperature
Discharge air temperature
Indoor unit
Fan speed (High) rpm 1,300
Airfl ow (High)
Intake air temperature
Fan speed rpm 840 810
Airfl ow
Outdoor unit
PSIG
PSIG
DB °F 80 70
WB °F 67 60
DB °F 56 111
WB °F 53
CFM
DB °F 95 47
WB °F 43
CFM
MSZ-GE24NA MSY-GE24NA
MUZ-GE24NA MUY-GE24NA
395 405
141 102
634 (Wet) 738
1,769 1,701
MSZ-GE24NA
MUZ-GE24NA
Page 28
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
Capacity correction factors
Input correction factors
Input correction factors
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
MUZ-GE09NA MUY-GE09NA
050100150
0.5
1.0
1.5
(Hz) (Hz)
0 50 100 150
0.5
1.0
2.0
1.5
(Hz) (Hz)
MUZ-GE12NA MUY-GE12NA
Capacity correction factors
Input correction factors
Input correction factors
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
0 50 100 150
0.5
1.0
1.5
(Hz)
050100150
0.5
1.0
1.5
(Hz)
0 50 100 150
0.5
1.0
1.5
(Hz) (Hz)
MUZ-GE09NA
MUZ-GE12NA
0 50 100 150
0.5
1.0
1.5
2.0
0 50 100 150
0.5
1.0
1.5
050100150
0.5
1.0
2.0
1.5
Capacity correction factors
Input correction factors
Input correction factors
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
MUZ-GE15NA MUY-GE15NA
(Hz) (Hz)
(Hz) (Hz)
MUZ-GE18NA MUY-GE18NA
Capacity correction factors
Input correction factors
Input correction factors
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
050100150
0.5
1.0
1.5
(Hz)
0 50 100 150
0.5
1.0
1.5
(Hz)
0 50 100 150
0.5
1.0
1.5
(Hz) (Hz)
MUZ-GE15NA
MUZ-GE18NA
0 50 100 150
0.5
1.0
2.0
1.5
0 50 100 150
0.5
1.0
2.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
0 50 100 150
0.5
1.0
1.5
28
Page 29
29
7-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation)
MUZ-GE24NA MUY-GE24NA
Capacity correction factors
Correction of Cooling capacity
The operational frequency of compressor
Correction of Cooling total input
The operational frequency of compressor
Correction of Heating total input
The operational frequency of compressor
Correction of Heating capacity
The operational frequency of compressor
MUZ-GE24NA
0 50 100 150(Hz)
0.5
1.0
1.5
0 50 100 150(Hz)
0.5
1.0
1.5
2.0
2.5
0 50 100 150(Hz)
0.5
1.0
1.5
0 50 100 150(Hz)
0.5
1.0
1.5
2.0
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.
Page 30
ON
OFF
Compressor
Outdoor fan
motor
R.V.coil
ON
OFF
ON
OFF
<COOL>
5 seconds
<HEAT>
5 seconds
8
ACTUATOR CONTROL
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA
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
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Discharge temperature thermistor
Indoor coil temperature thermistor
Defrost thermistor (MUZ) Heating: Defrosting
Fin temperature thermistor Protection
Ambient temperature thermistor
Outdoor heat exchanger tem­perature thermistor
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
Sensor Purpose
ON OFF OFF
Protection
Cooling: Coil frost prevention
Heating: High pressure protec­tion
Cooling: Low ambient tempera­ture operation
Cooling: Low ambient tempera­ture operation
Cooling: High pressure protec­tion
Actuator
Compressor
LEV
Outdoor fan
motor
R.V.coil
(MUZ)
Indoor fan
○○ ○
○○ ○○○○○
○○ ○○○
○○○ ○○○
30
motor
Page 31
31
9
SERVICE FUNCTIONS
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA
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
(Initial setting)
JS
Soldered
None (Cut)
MUZ-GE09 MUZ-GE12 MUZ-GE15 MUZ-GE18 MUZ-GE18/24
41°F (5°C) 50°F (10°C) 41°F (5°C) 48°F (9°C) 50°F (10°C)
46°F (8°C) 55°F (13°C) 50°F (10°C) 64°F (18°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.
Defrost fi nish temperature
10
TROUBLESHOOTING
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after con­firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board.
3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
<Incorrect>
Lead wiring
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 OPERATION INDICATOR lamp 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.
<Correct>
Housing point
Page 32
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
MSZ-GE06/09/12/15/18NA MSY-GE09/12/15/18NA
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.
MSZ-GE24NA MSY-GE24NA
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.
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
Yes
Judgment of indoor/outdoor abnormality
Releasing the failure mode recall function
Deleting the memorized abnormal condition
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.
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.
The indoor unit is abnormal. Check the blinking pattern, and confi rm the abnormal point with the indoor unit failure mode table. (Refer to indoor unit service manual.) Make sure to check at least two consecutive blinking cycles. 2
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.
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.
(Blinks)
No
1
No (OFF)
Yes
1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.
Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnor­malities that can not be recalled with this way. Confi rm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to 10-2.2)
The outdoor unit is abnormal. Check the blinking pattern, and confi rm the abnormal point with the outdoor unit failure mode table. (Refer to 10-2.3) Make sure to check at least two consecutive blinking cycles. 3
2. Blinking pattern when the indoor unit is abnormal:
2.5-second OFF
Blinking at 0.5­second interval
2.5-second OFF
Blinking at 0.5­second interval
ON
OFF
Repeated cycle Repeated cycle
Beeps
3.Blinking pattern when the outdoor unit is abnormal:
2.5-second OFF 3-second ON
Blinking at 0.5­second interval
Beeps
2.5-second OFF
Repeated cycle
3-second ON
ON
OFF
No beep Beeps
Repeated cycle
No beep Beeps
Repeated cycle
Beeps
Blinking at 0.5­second interval
Repeated cycle
32
Page 33
33
2. Flow chart of the detailed outdoor unit failure mode recall function
Operational procedure
The outdoor unit might be abnormal. Confi rm if outdoor unit is abnormal according to the following procedures.
Confi rm that the remote controller is in the failure mode recall function.
With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 77°F (25°C).
1
Does 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
)
No (OFF)
1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.
The outdoor unit is abnormal. Check the blinking pattern, and confi rm the abnormal point with the out- door 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" 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:
2.5-second OFF 3-second ON
ON
OFF
No beep
Repeated cycle
Blinking at 0.5­second interval
Beeps
2.5-second OFF 3-second ON
No beep Beeps
Repeated cycle
Blinking at 0.5-
second interval
Repeated cycle
Page 34
3. Outdoor unit failure mode table
OPERATION
INDICATOR
upper lamp
(Indoor unit)
OFF None (Normal)
2-time fl ash
2.5 seconds OFF
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
5-time fl ash
2.5 seconds OFF
6-time fl ash
2.5 seconds OFF
7-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
9-time fl ash
2.5 seconds OFF
10-time fl ash
2.5 seconds OFF
11-time fl ash
2.5 seconds OFF
12-time fl ash
2.5 seconds OFF
14-time fl ash
2.5 seconds OFF
Abnormal point
(Failure mode / protection)
Outdoor power system
Discharge temperature thermistor
Defrost thermistor (MUZ)
Fin temperature thermistor 3-time fl ash
P.C. board temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature thermistor
(MUZ/MUY-GE24NA)
Overcurrent 11-time fl ash
Compressor synchronous abnormality (Compressor start­up failure protection)
Discharge temperature
High pressure
Fin temperature/ P.C. board temperature
Outdoor fan motor
Nonvolatile memory data 5-time fl ash
Power module
(MUZ/MUY-GE24NA)
Discharge temperature
DC voltage 8-time fl ash
Each phase current of compressor
Overcurrent Compressor open­phase
Stop valve (Closed valve) 14-time fl ash
LED indication
(Outdoor P.C. board)
—— —
1-time fl ash every
2.5 seconds
2.5 seconds OFF 4-time fl ash
2.5 seconds OFF 2-time fl ash
2.5 seconds OFF
2.5 seconds OFF
12-time fl ash
2.5 seconds OFF
7-time fl ash
2.5 seconds OFF
2.5 seconds OFF 6-time fl ash
2.5 seconds OFF
2.5 seconds OFF 9-time fl ash
2.5 seconds OFF 10-time fl ash
2.5 seconds OFF
2.5 seconds OFF
Condition Remedy
Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started.
Thermistor shorts or opens during compressor running.
Large current fl ows into intelligent power module.
Waveform of compressor current is distorted.
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 (MUZ only). Temperature of outdoor
heat exchanger temperature thermistor exceeds 158°F (70°C) in COOL mode.
Temperature of fi n temperature thermistor on the inverter P.C. board exceeds 167 ~ 176°F (75 ~ 80°C), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 158 ~ 167°F (70 ~ 75°C).
Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up.
Nonvolatile memory data cannot be read properly.
The interphase short circuit occurs in the output of the intelligent power module (IPM). The compressor winding shorts circuit.
Temperature of discharge temperature thermistor has been 122°F (50°C) or less for 20 minutes.
DC voltage of inverter cannot be detected normally.
Each phase current of compressor cannot be detected normally.
Large current fl ows into intelligent power module (IPM). The open-phase operation of compressor is detected. The interphase short circuit occurs in the output of the intelligent power module (IPM). The compressor winding shorts circuit.
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 identifi ed 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.
• of outdoor fan motor".
Refer to 10-5. "Check
• of outdoor fan motor". Refer to 10-5. "Check of inverter P.C. board".
Replace the inverter
• P.C. board.
Refer to 10-5. "How
• to check inverter/ compressor".
Refer to 10-5. "Check
• of LEV". Check refrigerant circuit
• and refrigerant amount.
Refer to 10-5. "How
• to check inverter/ compressor".
Reconnect compressor
• connector. Refer to 10-5. "How
• to check inverter/ compressor".
Check stop valve
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).
"Check
Indoor/ outdoor unit failure mode
recall function
Outdoor unit failure mode
recall function
○○
○○
○○
○○
34
Page 35
35
10-3. TROUBLESHOOTING CHECK TABLE
No. Symptom LED indication
Outdoor unit does
1
not oper­ate.
2
3
4
5
6
'Outdoor unit stops
7
and re­starts 3 minutes later' is
8
repeated.
9
10
11
12
13
14
Outdoor
15
unit oper­ates.
16
17
Outdoor
18
unit oper­ates.
19
20
NOTE: 1. The location of LED is illustrated at the right fi gure. Refer to 10-6.1.
2. LED is lighted during normal operation. The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF. Flashing (Example) When the fl ashing frequency is “2”.
1-time fl ash every
2.5 seconds
6-time fl ash
2.5 seconds OFF 11-time fl ash
2.5 seconds OFF 14-time fl ash
2.5 seconds OFF
2-time fl ash
2.5 seconds OFF
3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
5-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
10-time fl ash
2.5 seconds OFF
12-time fl ash
2.5 seconds OFF 13-time fl ash
2.5 seconds OFF 1-time fl ash
2.5 seconds OFF 3-time fl ash
2.5 seconds OFF
4-time fl ash
2.5 seconds OFF
7-time fl ash
2.5 seconds OFF
8-time fl ash
2.5 seconds OFF
9-time fl ash
2.5 seconds OFF
Abnormal point/
Condition
Outdoor power sys­tem
Outdoor thermistors Discharge temperature thermistor, fi n temperature thermistor, de-
Outdoor control sys­tem
Serial signal The communication fails between the indoor and outdoor unit for
Stop valve/ Closed valve
Outdoor unit (Other abnormality)
Overcurrent protec­tion
Discharge tempera­ture overheat protec­tion
Fin temperature /P.C. board temperature thermistor overheat protection
High pressure pro­tection
Compressor syn­chronous abnormal­ity
Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after
Each phase current of compressor
DC voltage DC voltage of inverter cannot be detected normally. Refer to 10-5. "How to check inverter/
Frequency drop by current protection
Frequency drop by high pressure protec­tion
Frequency drop by defrosting in COOL mode
Frequency drop by discharge tempera­ture protection
Low discharge tem­perature protection
PAM protection PAM: Pulse Amplitude Modulation
Zero cross detecting circuit
Inverter check mode The connector of compressor is disconnected, inverter check
Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started, or failure of re­start of compressor has repeated 24 times.
frost thermistor, outdoor heat exchanger temperature thermistor, P.C. board temperature thermistor or ambient temperature therm­istor shorts or opens during compressor running.
Nonvolatile memory data cannot be read properly. (The upper lamp of OPERATION INDICATOR of the indoor unit lights up or fl ashes 7 times.)
3 minutes. Closed valve is detected by compressor current. Check stop valve.
Outdoor unit is defective. Refer to 10-2.2. "Flow chart of the de-
Large current fl ows into intelligent power module.
When overcurrent protection occurs within 10 seconds after
compressor starts, compressor restarts after 15 seconds (
GE09/12/15/18NA, MUY-GE09/12/15/18NA)
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 fi n temperature thermistor on the heat sink ex- ceeds 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).
Temperature of indoor coil thermistor exceeds 158°F (70°C) in HEAT mode (MUZ only). Temperature of outdoor heat exchanger
temperature thermistor exceeds 158°F (70°C) in COOL mode. The waveform of compressor current is distorted. Reconnect connector of compressor.
outdoor fan start-up.
Each phase current of compressor cannot be detected normally. Refer to 10-5.
Current from power outlet is nearing Max. fuse size. The unit is normal, but check the follow-
Temperature of indoor coil thermistor exceeds 131°F (55°C) in HEAT mode, compressor frequency lowers.
Indoor coil thermistor reads 46°F (8°C) or less in COOL mode, compressor frequency lowers.
Temperature of discharge temperature thermistor exceeds 232°F (111°C), compressor frequency lowers.
Temperature of discharge temperature thermistor has been 122°F (50°C) or less for 20 minutes.
The overcurrent fl ows into IGBT (Insulated Gate Bipolar transis- tor: TR821) or the bus-bar voltage reaches 320 V or more, PAM stops and restarts.
Zero cross signal for PAM control cannot be detected.
mode starts.
0.5-second ON
Condition Remedy
.
0.5-second ON
Reconnect connector of compressor.
• Refer to 10-5. "How to check inverter/
• compressor". Check stop valve.
• Refer to 10-5. "Check of outdoor
• thermistors".
Replace inverter P.C. board.
Refer to 10-5. "How to check miswir-
• ing and serial signal error.
• tailed outdoor unit failure mode recall function".
Reconnect connector of compressor.
• Refer to 10-5. "How to check inverter/
MUZ-
compressor". Check stop valve.
• Check refrigerant circuit and refrigerant
• amount. Refer to 10-5. "Check of LEV".
Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 10-5. "Check of outdoor fan
• motor".
Check refrigerant circuit and refrigerant
• amount. Check stop valve.
• Refer to 10-5. "How to check inverter/
• compressor".
Refer to 10-5. "Check of outdoor fan
• motor. Refer to 10-5. "Check of inverter P.C.
• board.
• compressor".
• compressor".
ing. Check if indoor fi lters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circula-
• tion is short cycled.
Check refrigerant circuit and refrigerant
• amount. Refer to 10-5.
• Refer to 10-5. "Check of outdoor
• thermistors".
Refer to 10-5. "Check of LEV".
• Check refrigerant circuit and refrigerant
• amount.
This is not malfunction. PAM protection will be activated in the following cases:
1 Instantaneous power voltage drop
(Short time power failure)
2 When the power supply voltage is high.
Check if the connector of the compres­sor is correctly connected. Refer to 10-5. sor".
Inverter P.C. board (Parts side)
"How to check inverter/
"Check of LEV".
"How to check inverter/compres-
MUZ/MUY­GE24NA
LED
ON
OFF
2.5-second OFF
2.5-second OFF
Flashing
LED
MUZ/MUY­GE09/12/15/ 18NA
Page 36
10-4. TROUBLE CRITERION OF MAIN PARTS
LEV
WHT
RED
ORN
YLW
BRN
BLU
MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUZ-GE18NA MUZ-GE24NA MUY-GE09NA MUY-GE12NA MUY-GE15NA MUY-GE18NA MUY-GE24NA
Part name Check method and criterion Figure
Defrost thermistor (RT61)
(MUZ)
Fin temperature thermistor (RT64)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)
Discharge temperature thermistor (RT62)
Compressor
Measure the resistance with a tester.
Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the chart of thermistor.
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: -4 ~ 104°F (-20 ~ 40°C))
Normal (Ω)
GE09 GE12 GE15/18 GE24
U-V
U-W
1.36 ~ 1.93 1.52 ~ 2.17 0.78 ~ 1.11 0.83 ~ 1.18
V-W
WHT
V
RED BLK
W
U
Outdoor fan motor
R. V. coil (21S4)
(MUZ)
Expansion valve coil (LEV)
Measure the resistance between lead wires using a tester. (Temperature: -4 ~ 104°F (-20 ~ 40°C))
Color of lead wire
GE09/12 GE15 GE18/24
Normal (Ω)
RED – BLK
BLK – WHT
28 ~ 40 11 ~ 16
WHT – RED
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))
Color of lead wire Normal (Ω)
WHT – RED RED – ORN
YLW – BRN
37 ~ 54
BRN – BLU
WHT
V
RED BLK
W
U
36
Page 37
37
10-5. TROUBLESHOOTING FLOW
A How to check inverter/compressor
Disconnect the connector between compressor and the intelligent power module (IPM).
Check the voltage between terminals.
Are the voltages balanced?
Yes
Check the compressor.
No
See 10-5. “Check of open phase”.
Replace the inverter P.C. board.
See 10-5.
“Check of compressor”.
B Check of open phase
With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if
the inverter is normal by measuring the voltage balance between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
<< Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERA-
TION: Refer to 7-6.) <<Measurement point>> at 3 points BLK (U) - WHT (V) BLK (U) - RED (W) WHT(V) - RED (W)
NOTE: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of the inverter P.C. board fl ashes 9 times. (Refer to 10-6.1.)
Measure AC voltage between the lead wires at 3 points.
C Check of compressor
Refer to 10-5. “Check of compressor winding”. Is the compressor normal?
Yes
Refer to 10-5. “Check of compressor operation time”. Does the compressor operate continuously?
Yes
OK.
No
No
Replace the compressor.
Refer to 10-5. “Check of compressor start failure”.
Page 38
D Check of compressor winding
Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the
compressor terminals. <<Measurement point>> at 3 points BLK - WHT BLK - RED
Measure the resistance between the lead wires at 3 points. 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
1 second
2 seconds
10 seconds
Compressor starts
Abnormal (IPM failure) (Compressor winding short)
Abnormal (Compressor lock out) (Starting defect)
Abnormal (Poor contact,) (Outdoor P.C. board defect) (Disconnected connector)
F Check of compressor start failure
Confi rm that 1~4 is normal.
• Electrical circuit check Contact of the compressor connector
1. Output voltage of inverter P.C. board and balance of them (See 10-5. )
2. Direct current voltage between DB61(+) and (-)
3.
JP715(+) and JP30(-)
4.
Voltage between outdoor terminal block S1-S2
(MUZ/MUY-GE24NA
Does the compressor run for 10 seconds or more after it starts?
No
After the compressor is heated with a drier, does the compressor start?
1
Yes
Compressor start failure. Activate pre-heat control. (Refer to 9-2. "PRE-HEAT CONTROL SETTING")
(MUZ/MUY-GE09/12/15/18NA)
) on the inverter P.C. board
Check the refrigerant circuit.
Yes
No
Check the stop valve.
Replace the compressor.
Abnormal (Refrigerant circuit defect) (Closed valve)
10 minutes
Normal
/
1 Heat the compressor with a drier for about 20 minutes. Do not recover refrigerant gas while heating.
38
Heating part
Page 39
39
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
Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch.
Does the unit operate for 10 minutes or more without showing thermistor abnormality?
Yes
OK. (Cause is poor contact.)
No
Replace the thermistor except RT64. When RT64 is
No
abnormal, replace the inverter P.C. board.
Replace the inverter P.C. board.
MUZ/MUY-GE09/12/15/18NA
Thermistor Symbol Connector, Pin No. Board
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
MUZ/MUY-GE24NA
Thermistor Symbol Connector, Pin No. Board
Defrost (MUZ) RT61 Between CN671 pin1 and pin2 Discharge temperature RT62 Between CN671 pin3 and pin4 Fin temperature RT64 Between CN673 pin1 and pin2 Ambient temperature RT65 Between CN672 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6
Inverter P.C. board
Inverter P.C. board
H Check of R.V. coil
MUZ-GE09/12/15/18/24NA
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. In case CN721 (MUZ-GE09/12/15/18NA)/CN602 (MUZ-GE24NA) is disconnected or R.V. coil is open, voltage is
generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil.
Check if CN721 (MUZ-GE09/12/15/18NA)/CN602 (MUZ-GE24NA) is connected.
Unit operates COOL mode even if it is set to HEAT mode.
Disconnect connector between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode).
Is there 208/230 VAC between CN721 (MUZ- GE09/12/15/18NA)/CN602 (MUZ-GE24NA)
and on the inverter P.C. board 3 minutes
after the power supply is turned ON?
Yes
Replace the 4-way valve.
Replace the inverter
No
P.C. board.
Unit operates HEAT mode even if it is set to COOL mode.
Disconnect connector between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).
Is there 230 VAC between CN721 (MUZ- GE09/12/15/18NA)/CN602 (MUZ-GE24NA)
and on the inverter P.C. board 3 minutes
after the power supply is turned ON?
No
Replace the 4-way valve.
Replace the inverter
Yes
P.C. board.
Page 40
I Check of outdoor fan motor
Disconnect the connectors CN931 and CN932 from the inverter P.C. board.Check the connec­tion between the connector CN931 and CN932.
Is the resistance between each ter­minal of outdoor fan motor normal? (Refer to 10-4.)
No
Yes
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)
Replace the outdoor fan motor.
Does the voltage between each terminal become 5 and 0
No
VDC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
No
Replace the inverter P.C. board.
Yes
40
Page 41
41
J Check of power supply
MUZ-GE09/12/15/18NA MUY-GE09/12/15/18NA
Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch.
Does The upper lamp of OPERATION INDICATOR lamp on the indoor unit light up?
Yes
No
Rectify indoor/outdoor connecting wire.
Is there voltage 208/230 VAC between the indoor terminal block S1 and S2?
Yes
Replace the indoor electronic control P.C.
No
board.
Is there bus-bar voltage 260-325 VDC between DB61 (+) and DB61 (–) on the inverter P.C. board? (Refer to 10-6.1.)
No
Check the electric parts in main circuit.
MUZ-GE24NA MUY-GE24NA
Disconnect the connector between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch.
Does the upper lamp of OPERATION INDICATOR on the indoor unit light up?
Yes
Yes
No
Does LED on the inverter P.C. board light up or fl ash? (Refer to 10-6.1.)
Yes
If LED lights up, it is OK. If LED fl ashes, refer to 10-3.
Rectify indoor/outdoor connecting wire.
Yes
Is there voltage 208/230 VAC between the indoor terminal block S1 and S2?
Replace the inverter
No
P.C. board.
DB61
Inverter P.C. board (Solder side)
Replace the indoor electronic control P.C.
No
board.
260-325 VDC
Is there bus-bar voltage 294 - 370 VDC between JP715 (+) and JP30 (–) on the inverter P.C. board? (Refer to 10-6.1.)
No
Check the electric parts in main circuit.
Yes
Does LED on the inverter P.C. board light up or fl ash? (Refer to 10-6.1.)
Yes
If LED lights up, it is OK. If LED fl ashes, refer to 10-3.
325 -370 VDC
Replace the inverter
No
P.C. board.
JP715
JP30
Page 42
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
MSZ-GE06/09/12/15/18NA MSY-GE09/12/15/18NA
MSZ-GE24NA MSY-GE24NA
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 fi xed to the expansion valve?
Yes
Does the resistance of LEV coil have the characteristics? (Refer to 10-4.)
No
Replace the LEV coil.
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.
No
Yes
Properly fi x 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
OK.
Yes
tester.
Replace the expansion valve.
1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.
Replace the inverter P.C.
No
board.
Yes
42
Page 43
43
L Check of inverter P.C. board
Check the outdoor fan motor. (Refer to 10-5. .)
Is the fuse (F901) blown on the in­verter P.C. board?
No
Check the connection of the connectors (CN931 , CN932) of the outdoor fan motor. If the connection is poor, make it correct.
Only for MUZ/MUY-GE24NA
Operate the outdoor unit by starting EMERGENCY OPERATION.
Check the LED indication on the in­verter P.C. board. Does the LED fl ash 10 times?
Yes (10-time fl ash)
Replace the inverter P.C. board.
Yes
No
Check the remedy following LED indication. (Refer to 10-3.)
Page 44
M How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the power supply?
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Press EMERGENCY OPERATION switch once.
Does the OPERATION INDICATOR lamp light up? <Confi rmation of the power to the indoor unit>
Is serial signal error indicated 6 minutes later?
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 normal? (Refer to "TEST POINT DIAGRAM AND VOLTAGE" in this manual.)
Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-sec­ond-ON quick blinking"? 3
Turn OFF the power supply. Remove the short-circuit between outdoor terminal block S2 and S3.
Yes
Yes
Yes
Yes
A
Yes
Yes
No
No
No
1. Miswiring may damage indoor electronic control P.C.
3. Be sure to check this within 3 minutes after turning ON.
No (Lighted or not lighted)
Check the power supply.
Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connect­ing wire?
board during the operation. Be sure to confi rm the wiring is correct before the opera- tion starts.
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.
Replace the inverter P.C. board . 2
No
No
2. Be careful of the residual voltage of smoothing capacitor.
Check the wiring.
Correct them.
Yes
Check of power supply. (Refer to 10-5. .)
No
A
Turn OFF inverter-controlled lighting
• equipment. Turn OFF the power supply and then
• turn ON again. Press EMERGENCY OPERATION
• switch.
Reinstall
• either the unit or the light away from
No
each other. Attach a fi lter on remote control receiv­ing section of the indoor unit.
Is serial signal error indicated 6 minutes later?
Yes
B
Replace the indoor elec­tronic control P.C. board.
44
Page 45
45
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.?
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
No
Yes
Yes
Yes
Yes
Ground the unit.
Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.
Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.
Replace or repair the antenna. Replace or repair the coaxial cable.
Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wir­ing of the antennas.
Even if all of the above conditions are fulfi lled, the electromagnetic noise may enter, depending on the electric fi eld strength or the installation condition (combination of specifi c conditions such as antennas or wiring). Check the followings before asking for service.
1. Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of: indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver
5. Electric fi eld intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifi er such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the elec­tromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
Page 46
-4 14 32 50 68 86 104
0
10
20
30
40
50
60
70
80
90
100
Temperature(°F)
Defrost thermistor(RT61) (MUZ) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68)
Temperature(°F)
Discharge temperature thermistor(RT62)
32 50 68 86 104 122 140 158 176 194 212 230 248
0
100
200
300
400
500
600
700
32 50 68 86 104 122 140 158 176
0
20
40
60
80
100
120
140
160
180
200
Temperature(°F)
Fin temperature thermistor(RT64)
Resistance(kΩ)
Resistance(kΩ)
Resistance(kΩ)
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)
Fuse (F801) T3.15AL250V
Smoothing capacitor (C61)
Fuse (F701) T3.15AL250V
R.V.coil (CN721) 208/230 VAC
(MUZ)
208/230 VAC
Back side of unit
208/230 VAC
Fuse (F901) T3.15AL250V
Output to drive compressor (LDU, LDV, LDW)
Bus-bar voltage DB61 260-325 VDC
(-)
(+)
Smoothing capacitor (C63)
Front side of unit
Fin temperature
thermistor/RT64
(CN642)
Output to drive outdoor
fan motor (CN932)
Ambient temperature
thermistor/RT65
(CN643)
Defrost thermistor
Outdoor heat exchanger
temperature thermistor
/RT68 (CN644)
/RT61(CN641)(MUZ)
LED
LEV connector (CN724)
Signal of outdoor fan
Discharge temperature
thermistor/RT62
46
motor (CN931)
(CN641)
Jumper wire for changing defrost setting (JS)(MUZ)
Jumper wire for pre-heat control setting (JK)
Page 47
47
-4 14 32 50 68 86 104
0
10
20
30
40
50
60
70
80
90
100
Temperature(°F)
Defrost thermistor(RT61) (MUZ) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68)
Temperature(°F)
Discharge temperature thermistor(RT62)
32 50 68 86 104 122 140 158 176 194 212 230 248
0
100
200
300
400
500
600
700
32 50 68 86 104 122 140 158 176
0
20
40
60
80
100
120
140
160
180
200
Temperature(°F)
Fin temperature thermistor(RT64)
Resistance(kΩ)
Resistance(kΩ)
Resistance(kΩ)
MUZ-GE18NA MUY-GE18NA
Back side of unit
208/230 VAC
Fuse (F901) T3.15AL250V
Output to drive compressor (LDU, LDV, LDW)
Bus-bar voltage DB61 260-325 VDC
(-)
(+)
Smoothing capacitor (C63)
Smoothing capacitor (C62)
Fuse (F801) T3.15AL250V
Smoothing capacitor (C61)
Fuse (F701) T3.15AL250V
R.V.coil (CN721) 208/230 VAC
(MUZ)
208/230 VAC
Front side of unit
Fin temperature
thermistor /RT64
(CN642)
Outdoor heat exchanger
temperature thermistor
/RT68(CN644)
Defrost thermistor
(CN643)
/RT61(CN641)(MUZ)
Discharge temperature
thermistor /RT62
Ambient temperature
thermistor /RT65
Signal of outdoor fan
(CN641)
Output to drive outdoor
fan motor (CN932)
motor (CN931)
LEV connector (CN724)
LED
Jumper wire for changing
defrost setting (JS)(MUZ)
Jumper wire for pre-heat
control setting (JK)
Page 48
-4 14 32 50 68 86 104
0
10
20
30
40
50
60
70
80
90
100
Temperature(°F)
Defrost thermistor(RT61) (MUZ) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68)
Temperature(°F)
Discharge temperature thermistor(RT62)
32 50 68 86 104 122 140 158 176 194 212 230 248
0
100
200
300
400
500
600
700
32 50 68 86 104 122 140 158 176
0
20
40
60
80
100
120
140
160
180
200
Temperature(°F)
Fin temperature thermistor(RT64)
Resistance(kΩ)
Resistance(kΩ)
Resistance(kΩ)
MUZ-GE24NA MUY-GE24NA
Fuse (F62) T2.0AL250V
Fuse (F601) T3.15AL250V (MUZ)
R.V. coil (CN602) 208/230 VAC (MUZ)
Jumper wire for changing defrost setting (JS) (MUZ)
Jumper wire for pre-heat control setting (JK)
Signal of out­door fan motor (CN931)
LED
Output to drive outdoor fan motor (CN932)
Fuse (F901) T3.15AL250V
Fuse (F880) T3.15AL250V
Defrost thermistor /RT61 (CN671) (MUZ)
Discharge temperature thermistor/RT62 (CN671)
Outdoor heat exchanger temperature thermistor /RT68 (CN671)
Ambient temperature thermistor/RT65
(CN672)
Fin temperature thermistor/RT64 (CN673)
LEV connector (CN724)
48
JP715 (+)
Bus-bar voltage 325 - 370 VDC
JP30 (-)
Page 49
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
Slide the sleeve. Pull the terminal while
Locking lever
pushing the locking lever.
(2) The terminal with this connector has the locking mechanism.
11-1. MUZ-GE09NA MUZ-GE12NA MUZ-GE15NA MUY-GE09NA MUY-GE12NA MUY-GE15NA
OPERATING PROCEDURE PHOTOS
1. Removing the cabinet
(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. (5) 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.
Photo 1
Screws of the top panel
Hold the sleeve, and pull out the terminal slowly.
Connector
NOTE: Turn OFF power supply before disassembly.
Screws of the top panel
Back panel
Screw of the back panel
Photo 2
Screws of the cabinet
Screw of the cabinet
Screws of the terminal block support and the back panel
Screw of the service panel
Direction to remove
Hooks
Screws of the cabinet
Photo 3
Conduit cover
49
Service
panel
Screw of the
conduit cover
Conduit plate
Page 50
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 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 heat sink support and the
separator.
(5) Remove the fixing screws of the terminal block support and
the back panel. (6) Remove the inverter assembly. (7) Remove the screw of the ground wire and screw of the ter-
minal block support. (8) Remove the heat sink support from the P.C. board support. (9) Remove the screw of the inverter P.C. board and remove
the inverter P.C. board from the P.C. board support.
Photo 4
Screws of the heat sink support and the separator
Photo 5 (Inverter assembly)
Heat sink Inverter P.C. board
Hook of the P.C. board support
P.C. board support
Screws of the terminal block support and the back panel
Screw of the terminal block 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.
(MUZ)
Heat sink support
Hook of the P.C. board support
Photo 6
Discharge temperature thermistor
Terminal
block support
Screw of the
ground wire
Screw of the P.C. board fixture
R.V. coil (MUZ)
50
Page 51
51
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 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 6) (4) Pull out the defrost thermistor from its holder. (5) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (6) Pull out the ambient temperature thermistor from its holder.
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. (4) Remove the propeller. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor.
Photo 7
Photo 8
Outdoor heat exchanger tempera­ture thermistor
Defrost thermistor
(MUZ)
Screws of the outdoor fan motor
6. Removing the compressor and 4-way valve
(1) Remove the cabinet and panels. (Refer to 1.) (2) Remove the inverter assembly. (Refer to 2.) (3) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure
gauge shows 0 PSIG.
(4) Detach the brazed part of the suction and the discharge
pipes connected with compressor. (5) Remove the nuts of compressor legs. (6) Remove the compressor. (7) Detach the brazed part of the pipes connected with 4-way
valve.
Propeller
Photo 9
Propeller nut
Brazed parts of 4-way valve
Page 52
11-2. MUZ-GE18NA MUY-GE18NA
NOTE: Turn OFF power supply before disassembly.
OPERATING PROCEDURE
1. Removing the cabinet
(1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the 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.
Photo 1
Screw of the top panel
Screws of the back panel
Photo 2
Screws of the top panel
PHOTOS
Screws of the cabinet
Screws of the cabinet
52
Screws of the cabinet
Screw of the service panel
Screw of the valve cover
Screws of the back panel
Page 53
53
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: <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 heat sink support and the sep-
arator.
(5) Remove the fixing screws of the terminal block support and
the back panel. (6) Remove the inverter assembly. (7) Remove the screw of the ground wire and screw of the termi-
nal block support. (8) Remove the heat sink support from the P.C. board support. (9) Remove the screw of the inverter P.C. board and remove the
inverter P.C. board from the P.C. board support.
Photo 3
Screw of the heat sink support and the separator
Photo 4 (Inverter assembly)
Heat sink
Hook of the P.C. board support
Inverter P.C. board
P.C. board support
Screws of the terminal block support and the back panel
Screws of the reactor
Screw of the terminal block 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.
Heat sink support
Hook of the P.C. board support
Photo5
Screw of the
ground wire
Screw of the P.C. board fixture
R.V. coil (MUZ)
Brazed parts of 4-way valve
Terminal block support
Page 54
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 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. (5) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (6) Pull out the ambient temperature thermistor from its holder.
5. Removing outdoor fan motor
(1)
Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931 and CN932 (Fan motor)
(3) Remove the propeller. (4) Remove the screws fixing the fan motor. (5) Remove the fan motor.
Photo 6
Photo 7
Screws of the outdoor fan motor
Outdoor heat exchanger tempera­ture thermistor
Ambient tem-
perature
thermistor
Defrost thermistor
(MUZ)
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 brazed part of the suction and the discharge
pipes connected with compressor.
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the brazed parts of 4-way valve and pipes. (Photo 5)
54
Photo 8
Brazed part of the discharge pipe
Discharge temperature thermistor
Brazed part of the suction pipe
Page 55
55
11-3. MUZ-GE24NA MUY-GE24NA
OPERATING PROCEDURE PHOTOS
NOTE: Turn OFF power supply before disassembly.
1. Removing the cabinet
(1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the screws fixing the conduit cover. (6) Remove the conduit cover. (7) Remove the top panel. (8) Remove the valve cover. (9) Disconnect the power supply and indoor/outdoor con-
necting wire.
(
10
) Remove the screws of the cabinet. (11) Remove the cabinet. (12)
Remove the screws of the back panel.
(13)
Remove the back panel.
Photo 2
Screws of the
Screws of the top panel
Screws of the back panel
back panel
Screws of the back panel
Photo 1
Screws of the cabinet
Photo 3
Screws of the top panel
Screws of the cabinet
Screws of the cabinet
Screws of the back panel
Screws of the back panel
Screws of the conduit cover
Conduit plate
Screws of the service panel
Screw of the valve cover
Page 56
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: <Inverter P.C. board> CN602 (R.V. coil) CN931, CN932 (Fan motor) CN671 (Defrost thermistor, discharge temperature thermistor
and outdoor heat exchanger temperature thermistor) CN672 (Ambient temperature thermistor) CN724 (LEV)
(3) Remove the compressor connector. (4) Remove the screws fixing the relay panel. (5) Remove the relay panel. (6) Remove the ground wires and the lead wires of the inverter
P.C. board. (7) Remove the screw of the PB support. (8) Remove the inverter P.C. board from the relay panel.
Photo 4
Inverter P.C board
Screws of the PB support
Ground wires
Screws of the relay panel
Screw of the relay panel
Screws of the PB support
3. Removing R.V. coil
(1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connector: <Inverter P.C. board>
CN602 (R.V. coil) (MUZ)
(3) Remove the R.V. coil.
Photo 5
Screw of the R.V. coil (MUZ)
Brazed parts of 4-way valve
56
Page 57
57
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>
CN671 (Defrost thermistor (MUZ), discharge temperature
thermistor and outdoor heart exchanger tempera­ture thermistor)
CN672 (Ambient temperature thermistor)
(3)
Pull out the discharge temperature thermistor from its holder.
(Photo 8) (4) Pull out the defrost thermistor from its holder. (5) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (6) Pull out the ambient temperature thermistor from its holder.
5. Removing outdoor fan motor
(1)
Remove the top panel, cabinet and service panel. (Refer to 1.)
(2) Disconnect the following connectors:
<Inverter P.C. board>
CN931 and CN932 (Fan motor)
(3) Remove the propeller. (4) Remove the screws fixing the fan motor. (5) Remove the fan motor.
Photo 6
Outdoor heat exchanger tempera­ture thermistor
Photo 7
Ambient tem­perature thermistor
Defrost thermistor (MUZ)
6. Removing the compressor and 4-way valve
(1)
Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly. (Refer to 2.) (4) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0 MPa).
(5) Detach the brazed part of the suction and the discharge
pipes connected with compressor. (6) Remove the compressor nuts. (7) Remove the compressor. (8)
Detach the brazed parts of 4-way valve and pipes. (Photo 5)
Photo 8
Brazed part of the discharge pipe
Screws of the outdoor fan motor
Discharge temperature thermistor
Brazed part of the suction pipe
Page 58
TM
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2009 MITSUBISHI ELECTRIC CO.,LTD Distributed in Dec. 2010. No. OBH 549 REVISED EDITION-B Distributed in Sep. 2010. No. OBH 549 REVISED EDITION-A 5 Distributed in Jul. 2009. No. OBH 549 5 Made in Japan
New publication, effective Dec. 2010 Specifications subject to change without notice.
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