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INDOOR UNIT OUTDOOR UNIT
service manual no. obh733 revised edition-f indoor unit service manual msz-gl•na, msy-gl•na series (obh732) muz-gl18/24na muz-gl18/24nah muy-gl18/24na parts catalog (obb733) models muz-gl09na - u1 muz-gl09nah - u1 muy-g…
SERVICE MANUAL No. OBH733 REVISED EDITION-F Indoor unit service manual MSZ-GL•NA, MSY-GL•NA Series (OBH732) MUZ-GL18/24NA MUZ-GL18/24NAH MUY-GL18/24NA PARTS ...
DISASSEMBLY INSTRUCTIONS ···················· 64 OUTDOOR UNIT. 2 1 TECHNICAL CHANGES Use the specifi ed refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or f…
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Revision F:
� MUZ-GL24NA- U2 has been added.
OBH733 REVISED EDITION-E is void.
IONUDTODOOROURNUITNIT
SERVICE MANUAL
HFC
utilized
R410A
No. OBH733
REVISED EDITION-F
Models
MUZ-GL09NA - U1 MUZ-GL09NAH - U1 MUY-GL09NA - U1 MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUZ-GL12NA - U1 MUZ-GL12NAH - U1 MUY-GL12NA - U1 MUZ-GL15NA - U1 MUZ-GL15NAH - U1 MUY-GL15NA - U1 MUZ-GL18NA - U1 MUZ-GL18NAH - U1 MUY-GL18NA - U1 MUZ-GL24NA - ,U1 U2 MUZ-GL24NAH - U1 MUY-GL24NA - U1
MUZ-GL18/24NA MUZ-GL18/24NAH MUY-GL18/24NA
Indoor unit service manual MSZ-GL�NA, MSY-GL�NA Series (OBH732)
CONTENTS
1. TECHNICAL CHANGES ����������������������������������� 2 2. PART NAMES AND FUNCTIONS��������������������� 3 3. SPECIFICATION������������������������������������������������ 4 4. OUTLINES AND DIMENSIONS ������������������������ 7 5. WIRING DIAGRAM�������������������������������������������� 9 6. REFRIGERANT SYSTEM DIAGRAM ������������� 21 7. DATA���������������������������������������������������������������� 24 8. ACTUATOR CONTROL����������������������������������� 39 9. SERVICE FUNCTIONS ����������������������������������� 40 10. TROUBLESHOOTING������������������������������������� 41 11. DISASSEMBLY INSTRUCTIONS �������������������� 64
PARTS CATALOG (OBB733)
Use the specified refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
Revision A:
� MUZ-GL12/15NA- U1 , MUZ-GL12/15NAH- U1 and MUY-GL09/12/15NA- U1 have been added.
Revision B:
� MUZ-GL09NA- U8 and MUZ-GL09NAH- U8 have been added.
Revision C:
� MUZ-GL09NA- U1 and MUZ-GL09NAH- U1 have been added.
Revision D:
� MUZ-GL24NAH- U1 has been added.
Revision E:
� Capacity corrections have been corrected [7-1. 2), 3)].
Revision F:
� MUZ-GL24NA- U2 has been added.
1 TECHNICAL CHANGES
MUZ-GL09NA - U1 MUZ-GL09NAH - U1 MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUZ-GL12NA - U1 MUZ-GL12NAH - U1 MUZ-GL15NA - U1 MUZ-GL15NAH - U1 MUZ-GL18NA - U1 MUZ-GL18NAH - U1 MUZ-GL24NA - U1 , U2 MUZ-GL24NAH - U1
1. New model
MUY-GL09NA - U1
MUY-GL12NA - U1 MUY-GL15NA - U1 MUY-GL18NA - U1 MUY-GL24NA - U1
OBH733F
2
2 PART NAMES AND FUNCTIONS
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
Air inlet (back and side)
Piping
Air outlet Drain hose
Drain outlet
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Air inlet (back and side)
Piping Drain hose
Air outlet
Drain outlet
OBH733F
3
3 SPECIFICATION
Outdoor unit model
MUZ-
MUZ-
GL09NA- U1 GL09NA- U8
MUZ-
MUZ-
GL09NAH- U1 GL09NAH- U8
MUYGL09NA
MUZGL12NA
MUZGL12NAH
MUYGL12NA
Capacity
Rated (Minimum~Maximum)
Cooling 1
Btu/h
Heating 47 1 (MUZ) Btu/h
Capacity
Rated (Maximum)
Heating 17 2 (MUZ) Btu/h
9,000 (3,600 - 12,200)
10,900
10,900
(4,500 - 15,900) (4,500 - 14,100)
-
6,700 (10,200)
7,000 (9,400)
-
12,000 (1,500 - 13,600)
14,400 (2,000 - 18,100)
-
9,200 (12,000)
-
Power consumption
Rated (Minimum~Maximum)
Cooling 1
W
Heating 47 1 (MUZ) W
585 (240 - 1,050)
720
720
(230 - 1,250) (230 - 1,070)
-
920 (100 - 1,300)
1,100 (110 - 1,620)
-
Power consumption Heating 17 2 (MUZ) W
Rated (Maximum)
630 (1,060)
620 (790)
-
870 (1,240)
-
EER 1 [SEER] 3 Cooling
HSPF IV 4
Heating (MUZ)
15.4 [24.6]
13.0 [23.1]
NA: 12.8
-
NA: 12.5
-
NAH: 11.8
-
NAH: 11.5
-
COP
Heating 1 (MUZ)
4.44
-
3.84
-
Power factor
Cooling (208/230) % Heating (MUZ) (208/230) %
86/86 90/90
92/92 95/95
87/87 -
95/95 96/96
Power supply
V , phase , Hz
208/230, 1 , 60
Max. fuse size (time delay)
A
15
Min. circuit ampacity
A
9
7
9
7
Fan motor
F.L.A
A
0.50
Model
KNB073FRVMC SNB092FQAMT KNB073FRVMC
SNB092FQAMT
Compressor
R.L.A L.R.A
A A
6.2 7.7
4.9
6.6
4.9
6.1
8.2
6.1
Refrigeration oil fl oz. (L) (Model) 9.1 (0.27)/(FV50S) 11.8 (0.35)/(FV50S) 9.1 (0.27)/(FV50S)
11.8 (0.35)/(FV50S)
Refrigerant control
Linear expansion valve
Sound level 1
Cooling Heating (MUZ)
dB(A) dB(A)
48
49
49
50
-
51
-
Airflow High - Med. - Low
Cooling Heating (MUZ)
CFM CFM
1,186 - 1,116 - 1,045
1,102 - 639
-
1,186 - 1,116 - 1,045
-
Fan speed
Cooling
rpm
High - Med. - Low Heating (MUZ) rpm
870 - 820 - 770
810 - 490
-
870 - 820 - 770
-
Defrost method
Reverse cycle
W
in.
31-1/2
Dimensions
D
in.
11-1/4
H
in.
21-5/8
Weight
Ib.
81
External finish
Munsell 3Y 7.8/1.1
Remote controller
Wireless type
Control voltage (by built-in transformer) V DC
12 - 24
Refrigerant piping
Not supplied
Refrigerant pipe size Liquid
in.
(Min. wall thickness) Gas
in.
1/4 (0.0315) 3/8 (0.0315)
Connection method
Indoor Outdoor
Flared Flared
Between the indoor Height difference ft.
40
& outdoor units
Piping length
ft.
65
Refrigerant charge (R410A)
2 lb. 5 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)
(Heating) -- Indoor: 70�FDB, 60�FWB, Outdoor: 47�FDB, 43�FWB
2:
(Heating) -- Indoor: 70�FDB, 60�FWB, Outdoor: 17�FDB, 15�FWB
3: Test condition (Refer to page 6.)
4: Test condition (Refer to page 6.)
OBH733F
4
Outdoor unit model
MUZGL15NA
MUZGL15NAH
MUYGL15NA
MUZGL18NA
MUZGL18NAH
MUYGL18NA
MUZGL24NA
MUZGL24NAH
MUYGL24NA
Capacity
Rated (Minimum~Maximum)
Cooling 1
Btu/h
Heating 47 1 (MUZ) Btu/h
14,000 (3,100 - 18,200) 18,000 (5,800 ~ 22,000) 22,500 (8,200 ~ 31,400)
18,000 (4,800 - 20,900)
-
21,600 (5,400 ~ 25,000)
-
27,600 (7,500 ~ 36,900)
-
Capacity
Rated (Maximum)
Heating 17 2 (MUZ) Btu/h
12,200 (16,400)
-
13,800 (18,200)
-
16,000 (24,600)
-
Cooling 1
W
Power consumption
Rated (Minimum~Maximum) Heating 47 1 (MUZ) W
1,080 (210 - 2,000)
1,600 (200 ~ 2,010)
-
1,340 (330 ~ 2,150) 1,680 (320 ~ 2,500)
1,800 (570 ~ 3,580) 2,340 (520 ~ 3,650)
Power consumption Heating 17 2 (MUZ) W
Rated (Maximum)
1,190 (1,850)
-
1,480 (2,150)
-
1,770 (3,290)
-
EER 1 [SEER] 3 Cooling
HSPF IV 4
Heating (MUZ)
13.0 [21.6]
NA: 11.7
-
NAH: 10.8
-
13.4 [20.5]
NA: 11.2
-
NAH: 10.2
-
12.5 [20.5]
NA: 10.0
-
NAH: 10.0
-
COP
Heating 1 (MUZ)
3.30
-
3.77
-
3.46
-
Power factor
Cooling (208/230) % Heating (MUZ) (208/230) %
97/97 98/98
99/99
99/99
-
99/99
99/99
-
Power supply
V , phase , Hz
208/230, 1 , 60
Max. fuse size (time delay)
A
15
20
Min. circuit ampacity
A
10
9
14
17.1
Fan motor
F.L.A
0.50
0.93
0.93
Model
SNB130FQBMT
SNB130FQBMT
SNB172FQKMT
R.L.A
A
7.4
6.8
10
12.9
Compressor
L.R.A
A
9.3
8.5
12.5
16.1
Refrigeration oil fl oz. (L) (Model) 11.8 (0.35)/(FV50S) 11.8 (0.35)/(FV50S) 11.8 (0.35)/(FV50S)
13.5 (0.40)/(FV50S)
Refrigerant control
Linear expansion valve
Cooling
dB(A)
49
49
Sound level 1
Heating (MUZ)
dB(A)
51
-
54
55
-
55
55
-
Airflow
COOL
High - Med. - Low HEAT
CFM
1,102-639
CFM 1,186 - 1,045 - 1,045
-
1,742 - 922
1,691 - 1,691 - 1,372
-
2,016 - 1,769 - 890
1,701 - 1,701 - 1,341
-
Fan speed
Cooling
High - Med. - Low Heating (MUZ)
rpm
810 - 490
rpm 870 - 770 - 770
-
840 - 450
810 - 810 - 650
-
950 - 840 - 450
810 - 810 - 650
-
Defrost method
Reverse cycle
W
in.
31-1/2
33-1/16
Dimensions
D
in.
11-1/4
13
H
in.
21-5/8
34-5/8
Weight
Ib.
81
121
119
External finish
Munsell 3Y 7.8/1.1
Remote controller
Wireless type
Control voltage (by built-in transformer) V DC
12 - 24
Refrigerant piping
Not supplied
Refrigerant pipe size Liquid
in.
(Min. wall thickness) Gas
in.
1/4 (0.0315) 1/2 (0.0315)
3/8 (0.0315) 5/8 (0.0315)
Indoor Connection method
Outdoor
Flared Flared
Between the indoor Height difference ft.
40
50
& outdoor units
Piping length
ft.
65
100
Refrigerant charge (R410A)
2 lb. 9 oz.
3 lb. 9 oz.
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)
(Heating) -- Indoor: 70�FDB, 60�FWB, Outdoor: 47�FDB, 43�FWB
2:
(Heating) -- Indoor: 70�FDB, 60�FWB, Outdoor: 17�FDB, 15�FWB
3: Test condition (Refer to page 6.)
4: Test condition (Refer to page 6.)
OBH733F
5
Test condition
3, 4
ARI Mode
Test
"A-2" Cooling Steady State at rated compressor Speed
Indoor air condition (�F)
Dry bulb
Wet bulb
80
67
Outdoor air condition (�F)
Dry bulb
Wet bulb
95
(75)
"B-2" Cooling Steady State at rated compressor Speed
80
67
82
(65)
SEER "B-1" Cooling Steady State (Cooling) at minimum compressor Speed
80
67
82
(65)
"F-1" Cooling Steady State at minimum compressor Speed
80
67
67
(53.5)
"E-V" Cooling Steady State at intermediate compressor Speed 5
80
67
87
(69)
"H1-2" Heating Steady State at rated compressor Speed
70
60
47
43
"H3-2" Heating at rated compressor Speed
70
60
17
15
HSPF "H0-1" Heating Steady State (Heating) at minimum compressor Speed
70
60
62
56.5
"H1-1" Heating Steady State at minimum compressor Speed
70
60
47
43
"H2-V" Heating at intermediate compressor Speed 5
70
60
35
33
NOTE: 5: At intermediate compressor Speed = ("Rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
OPERATING RANGE (1) POWER SUPPLY
Rated voltage
Guaranteed voltage (V)
Outdoor unit
208/230 V 1 phase 60 Hz
Min. 187 208 230 Max. 253
(2) OPERATION
Mode
Condition
Standard temperature
Cooling
Maximum temperature Minimum temperature
Maximum humidity
Standard temperature
Heating Maximum temperature
Minimum temperature
Intake air temperature (�F)
Indoor
Outdoor
DB
WB
DB
WB
80
67
95
--
90
73
115
--
67
57
14
--
78 %
--
70
60
47
43
80
67
75
65
70
60
-4
-5
OBH733F
6
4 OUTLINES AND DIMENSIONS
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
REQUIRED SPACE
*1 4 in. (100 mm) or more when front and sides of the unit are clear
4
in. or
(m1o0r0emm)
clear *1
Unit: inch
4 in. o(1r0m0omrem)
(GL09/12/15NA) (GL09/12/15NAH)
holes
8 ino.r(m20o0rem*m2)
14 ionr. m(3o5r0e mm)
*2 When any 2 sides of left, right and rear of the unit are clear
Liquid refrigerant pipe joint Refrigerant pipe (flared) � 1/4
Gas refrigerant pipe joint Refrigerant pipe (flared) � 3/8 (GL09/12)
� 1/2 (GL15)
OBH733F
7
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Unit: inch
13 2
16-7/16 Air in
Air in
6-7/8
Air out 19-11/16
33-1/16 4-5/16
14-3/16 Clear *1
REQUIRED SPACE
*1 20 in. (500 mm) or more when front and sides of the unit are clear
Drain hole 1-5/8 1-9/16
4 or
mino. r(e100
mm)
4 oinr.m(1o0r0e mm)
2-holes 13/32 13/16 3-3/16
20orinm. (o5r0e0*2mm)
o1r 4mionr.e(350 mm)
*2 When any 2 sides of left, right and rear of the unit are clear
Service panel
Liquid refrigerant pipe joint Refrigerant pipe (flared) � 1/4 (GL18) Refrigerant pipe (flared) � 3/8 (GL24)
34-5/8
17-25/32
35 44
6-1/2 3-29/32
7-11/16
Gas refrigerant pipe joint Refrigerant pipe (flared) � 1/2 (GL18) Refrigerant pipe (flared) � 5/8 (GL24)
OBH733F
8
5 WIRING DIAGRAM
MUZ-GL09NA MUZ-GL12NA
OBH733F
9
MUZ-GL09NAH MUZ-GL12NAH
OBH733F
10
MUY-GL09NA MUY-GL12NA
OBH733F
11
MUZ-GL15NA
OBH733F
12
MUZ-GL15NAH
OBH733F
13
MUY-GL15NA
OBH733F
14
MUZ-GL18NA
OBH733F
15
MUZ-GL18NAH
OBH733F
16
MUY-GL18NA
OBH733F
17
MUZ-GL24NA
OBH733F
18
MUZ-GL24NAH
OBH733F
19
MUY-GL24NA
OBH733F
20
6 REFRIGERANT SYSTEM DIAGRAM
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
Refrigerant pipe �3/8 (�9.52) (GL09/12) �1/2 (�12.7) (GL15)
4-way valve
(with heat insulator) Flared connection
Muffler
Stop valve (with service port)
Service port
Discharge temperature thermistor RT62
Flared connection
Capillary tube O.D. 0.118 � I.D. 0.079 � 9-7/16 (�3.0 � �2.0 � 240) (MUZ-GL09NA/H - U1 )
Capillary tube
O.D. 0.157 �
I.D. 0.094 � 9-7/16 (�4.0 � �2.4 � 240)
LEV
(Other models )
Stop valve (with strainar) Refrigerant pipe �1/4 (�6.35)
(with heat insulator)
Muffler
Service port
Outdoor heat exchanger
Outdoor heat exchanger temperature thermistor RT68
Compressor
Defrost thermistor RT61 (MUZ)
Capillary tube O.D. 0.118 � I.D. 0.079 � 8-9/32 (�3.0 � �2.0 � 210)
Ambient temperature thermistor RT65
Strainer #100
R.V. coil (MUZ) heating ON cooling OFF
Refrigerant flow in cooling Refrigerant flow in heating (MUZ)
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
Refrigerant pipe �1/2 (�12.7) (with heat insulator)
4-way valve
Muffler with #100 mesh strainer
Flared connection
Stop valve (with service port)
Service port
Discharge temperature thermistor RT62
Service port
Defrost thermistor RT61 (MUZ)
Outdoor heat exchanger
Unit: Inch (mm)
Flared connection
Strainer #100
Stop valve
Refrigerant pipe �1/4 (�6.35) (with heat insulator)
Muffler
Compressor
Capillary tube
O.D. 0.118�
I.D. 0.079� 7-7/8
(�3.0�2.0�200(�4))
LEV
Strainer
#100
Capillary tube O.D. 0.157� I.D. 0.094� 3-15/16
(�4.0�2.4�100)
Capillary tube O.D. 0.157� I.D. 0.094�7-7/8
(�4.0�2.4�200)
Outdoor heat exchanger temperature thermistor RT68 R.V. coil (MUZ) heating ON cooling OFF
Refrigerant flow in cooling Refrigerant flow in heating (MUZ)
OBH733F
21
MUZ-GL24NA - U1 MUY-GL24NA
Refrigerant pipe �5/8 (�15.88) (with heat insulator)
4-way valve
Muffler with #100 mesh strainer
Service port
Flared connection
Stop valve (with service port)
Service port
Discharge temperature thermistor RT62
Defrost thermistor RT61 (MUZ)
Outdoor heat exchanger
Ambient temperature thermistor RT65
Unit: inch
Flared connection
Strainer #100
Stop valve
Refrigerant pipe �3/8 (�9.52) (with heat insulator)
Compressor
Outdoor heat exchanger temperature thermistor RT68
LEV Strainer #100
R.V. coil (MUZ)
heating ON
Capillary tube
cooling OFF
O.D.0.157 � I.D.0.094
� 3-15/16
Refrigerant flow in cooling
(�4.0�2.4�100)
Refrigerant flow in heating (MUZ)
MUZ-GL24NA - U2 MUZ-GL24NAH
Refrigerant pipe �5/8 (�15.88) (with heat insulator)
Muffler 4-way valve #100
Service port
Flared connection
Stop valve (with service port)
Discharge
temperature
Service port
thermistor RT62
Defrost thermistor RT61
Outdoor heat exchanger
Ambient temperature thermistor RT65
Flared connection
Strainer #100
CHECK VALVE
Stop valve
Refrigerant pipe �3/8 (�9.52) Capillary tube
(with heat insulator)
O.D.0.118 � I.D.0.071
� 21-21/32
(�3.0�1.8�550)
Compressor
LEV Strainer #100
Capillary tube O.D.0.157 � I.D.0.094 � 3-15/16 (�4.0�2.4�100)
Outdoor heat exchanger temperature thermistor RT68
R.V. coil heating ON cooling OFF
Refrigerant flow in cooling Refrigerant flow in heating
OBH733F
22
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Model
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Refrigerant piping: ft.
Max. Length A
Max. Height difference B
65
40
100
50
Piping size O.D: in.
Gas
Liquid
3/8 1/4
1/2
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
Outdoor unit
precharged
25
Refrigerant piping length (one way): ft.
30
40
50
60
65
MUZ-GL09NA - U1 MUZ-GL09NAH - U1
2 lb. 5 oz.
MUZ-GL09NA - U8
MUZ-GL09NAH - U8
MUY-GL09NA MUZ-GL12NA
0
MUZ-GL12NAH
2 lb. 9 oz.
MUY-GL12NA
MUZ-GL15NA
MUZ-GL15NAH
MUY-GL15NA
1.08
3.24
5.40
7.56
8.64
Calculation: X oz. = 1.08/5 oz./ft. � (Refrigerant piping length (ft.) - 25)
OBH733F
23
NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
Model
Outdoor unit precharged 25
MUZ-GL18NA
MUZ-GL18NAH 3 lb. 9 oz.
0
MUY-GL18NA
Refrigerant piping length (one way): ft.
30
40
50
60
70
80
90
100
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 33 ft. requires additional refrigerant charge according to the calculation.
Model
Outdoor unit
precharged
33
MUZ-GL24NA
MUZ-GL24NAH 4 lb. 3 oz.
0
MUY-GL24NA
Refrigerant piping length (one way): ft.
40
50
60
70
80
90
100
4.14
10.06
15.98
21.90
27.82
33.74
39.66
Calculation: X oz. = 2.96/5 oz./ft. � (Refrigerant piping length (ft.) - 33)
7 DATA
MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA
MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH
MUY-GL09NA MUY-GL12NA MUY-GL15NA MUY-GL18NA MUY-GL24NA
7-1. PERFORMANCE DATA 1) COOLING CAPACITY
Indoor air
Outdoor intake air DB temperature (�F)
Model
75
85
95
105
115
IWB (�F)
TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC
MUZ-GL09NA
71 11.0 7.6 0.52 10.3 7.1 0.57 9.7 6.6 0.61 9.0 6.2 0.65 8.3 5.7 0.67
MUZ-GL09NAH 67 10.4 8.6 0.49 9.7 8.0 0.54 9.0 7.4 0.59 8.4 6.9 0.62 7.7 6.3 0.65
MUY-GL09NA
63 9.8 9.4 0.47 9.1 8.7 0.52 8.5 8.1 0.56 7.7 7.3 0.60 7.0 6.7 0.62
MUZ-GL12NA
71 14.7 9.4 0.82 13.7 8.7 0.90 12.9 8.2 0.97 12.0 7.6 1.02 11.0 7.0 1.06
MUZ-GL12NAH 67 13.9 10.7 0.77 13.0 10.0 0.85 12.0 9.2 0.92 11.2 8.6 0.98 10.3 7.9 1.02
MUY-GL12NA
63 13.1 11.8 0.74 12.1 10.9 0.81 11.3 10.2 0.88 10.3 9.3 0.94 9.4 8.5 0.98
MUZ-GL15NA
71 17.2 9.7 0.96 16.0 9.1 1.05 15.1 8.5 1.13 14.0 7.9 1.19 12.9 7.3 1.24
MUZ-GL15NAH 67 16.2 11.4 0.91 15.1 10.6 1.00 14.0 9.8 1.08 13.0 9.1 1.14 12.0 8.4 1.20
MUY-GL15NA
63 15.3 12.7 0.86 14.1 11.8 0.96 13.2 11.0 1.03 12.0 10.0 1.10 10.9 9.1 1.14
MUZ-GL18NA
71 22.1 16.2 1.19 20.6 15.2 1.31 19.4 14.3 1.41 18.0 13.3 1.48 16.6 12.2 1.54
MUZ-GL18NAH 67 20.9 18.2 1.13 19.4 16.9 1.24 18.0 15.7 1.34 16.7 14.6 1.42 15.4 13.4 1.49
MUY-GL18NA
63 19.6 19.7 1.07 18.2 18.2 1.19 16.9 17.0 1.28 15.4 15.4 1.37 14.0 14.1 1.42
MUZ-GL24NA
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
MUZ-GL24NAH 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
MUY-GL24NA
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
NOTE: 1. IWB : Intake air wet-bulb temperature
TC : Total Capacity (x103 Btu/h)
SHC : Sensible Heat Capacity (x103 Btu/h) TPC : Total Power Consumption (kW)
2. SHC is based on 80�F of indoor Intake air DB temperature.
OBH733F
24
2) COOLING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
25 (std.)
40
65
MUZ-GL09NA
MUZ-GL09NAH
MUY-GL09NA
MUZ-GL12NA
MUZ-GL12NAH
1.0
MUY-GL12NA
MUZ-GL15NA
MUZ-GL15NAH
MUY-GL15NA
0.988
0.967
MUZ-GL18NA
MUZ-GL18NAH
1.0
MUY-GL18NA
0.985
0.963
MUZ-GL24NA
MUZ-GL24NAH
1.0
MUY-GL24NA
0.983
0.956
3) HEATING CAPACITY CORRECTIONS
Refrigerant piping length (one way: ft.)
MUZ-GL09NA MUZ-GL09NAH MUZ-GL12NA MUZ-GL12NAH MUZ-GL15NA MUZ-GL15NAH
25 (std.) 1.0
40 0.997
65 0.993
MUZ-GL18NA
MUZ-GL18NAH MUZ-GL24NA
1.0
MUZ-GL24NAH
0.997
0.993
100 -
0.933 0.921 100
0.987
OBH733F
25
4) HEATING CAPACITY (MUZ)
Indoor air
Outdoor intake air WB temperature (�F)
Model
5
15
25
35
43
IDB (�F)
TC TPC TC TPC TC TPC TC TPC TC TPC
MUZ-GL09NA
75 4.8 0.42 6.3 0.54 7.9 0.63 9.4 0.70 10.6 0.74 70 5.2 0.41 6.7 0.52 8.2 0.62 9.6 0.68 10.9 0.72
65 5.5 0.39 6.9 0.50 8.6 0.59 10.0 0.67 11.2 0.70
MUZ-GL12NA
75 6.3 0.65 8.4 0.82 10.4 0.96 12.5 1.07 14.0 1.13 70 6.8 0.62 8.9 0.79 10.8 0.94 12.7 1.05 14.4 1.10
65 7.2 0.59 9.1 0.76 11.3 0.91 13.2 1.02 14.8 1.07
75 MUZ-GL09NAH 70
4.8 0.55 6.3 0.67 7.9 0.76 9.4 0.70 10.6 0.74 5.2 0.54 6.7 0.65 8.2 0.75 9.6 0.68 10.9 0.72
65 5.5 0.52 6.9 0.63 8.6 0.72 10.0 0.67 11.2 0.70
75 MUZ-GL12NAH 70
6.3 0.78 8.4 0.95 10.4 1.09 12.5 1.07 14.0 1.13 6.8 0.75 8.9 0.92 10.8 1.07 12.7 1.05 14.4 1.10
65 7.2 0.72 9.1 0.89 11.3 1.04 13.2 1.02 14.8 1.07
MUZ-GL15NA
75 7.9 0.94 10.4 1.19 13.1 1.40 15.6 1.56 17.6 1.64 70 8.6 0.90 11.1 1.15 13.5 1.37 15.9 1.52 18.0 1.60
65 9.0 0.86 11.3 1.10 14.1 1.32 16.5 1.48 18.5 1.56
75 MUZ-GL15NAH 70
7.9 1.07 10.4 1.32 13.1 1.53 15.6 1.56 17.6 1.64 8.6 1.03 11.1 1.28 13.5 1.50 15.9 1.52 18.0 1.60
65 9.0 0.99 11.3 1.23 14.1 1.45 16.5 1.48 18.5 1.56
MUZ-GL18NA
75 9.5 0.99 12.5 1.25 15.7 1.47 18.7 1.64 21.1 1.72 70 10.3 0.95 13.3 1.21 16.2 1.44 19.1 1.60 21.6 1.68
65 10.8 0.91 13.6 1.16 17.0 1.39 19.8 1.55 22.2 1.64
75 9.5 1.12 12.5 1.38 15.7 1.60 18.7 1.64 21.1 1.72 MUZ-GL18NAH 70 10.3 1.08 13.3 1.34 16.2 1.57 19.1 1.60 21.6 1.68
65 10.8 1.04 13.6 1.29 17.0 1.52 19.8 1.55 22.2 1.64
MUZ-GL24NA
75 12.1 1.38 16.0 1.74 20.0 2.05 23.9 2.28 26.9 2.40 70 13.1 1.32 17.0 1.68 20.7 2.00 24.4 2.22 27.6 2.34
65 13.8 1.26 17.4 1.61 21.7 1.93 25.3 2.16 28.4 2.28
75 12.1 1.38 16.0 1.74 20.0 2.05 23.9 2.28 26.9 2.40 MUZ-GL24NAH 70 13.1 1.32 17.0 1.68 20.7 2.00 24.4 2.22 27.6 2.34
65 13.8 1.26 17.4 1.61 21.7 1.93 25.3 2.16 28.4 2.28
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.
45 TC TPC 11.0 0.75 11.2 0.73 11.6 0.71 14.5 1.14 14.8 1.12 15.3 1.09 11.0 0.75 11.2 0.73 11.6 0.71 14.5 1.14 14.8 1.12 15.3 1.09 18.1 1.66 18.5 1.63 19.1 1.58 18.1 1.66 18.5 1.63 19.1 1.58 21.7 1.75 22.2 1.71 22.9 1.66 21.7 1.75 22.2 1.71 22.9 1.66 27.7 2.43 28.4 2.39 29.3 2.32 27.7 2.43 28.4 2.39 29.3 2.32
55 TC TPC 12.4 0.78 12.7 0.76 13.0 0.75 16.4 1.19 16.8 1.17 17.1 1.14 12.4 0.78 12.7 0.76 13.0 0.75 16.4 1.19 16.8 1.17 17.1 1.14 20.5 1.73 21.0 1.70 21.4 1.66 20.5 1.73 21.0 1.70 21.4 1.66 24.6 1.81 25.2 1.78 25.7 1.75 24.6 1.81 25.2 1.78 25.7 1.75 31.5 2.53 32.2 2.48 32.8 2.43 31.5 2.53 32.2 2.48 32.8 2.43
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 or press any button on the remote controller.
OBH733F
26
7-2. PERFORMANCE CURVE Cooling
Cooling capacity (at Rated frequency)
1.5
1.4
Indoor intake air Wet-bulb temperature( F)
1.3
Capacity correction factors
1.2
79
1.1 75
1.0
0.9
72
68
64
14 23 32 41 50 59 68 77 86 95 104 113
Outdoor intake air DB temperature(�F)
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
Total power consumption (kW)
0.7 0.6 0.5 0.4 0.3 0.2
65
SHF at rating condition = 0.82
Airflow = 399 CFM 71 67 63
Indoor intake air WB temperature (�F)
75
85
95
105
115
Outdoor intake air DB temperature (�F)
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
Total power consumption (kW)
1.1 1.0 0.9 0.8 0.7 0.6
65
SHF at rating condition = 0.77
Airflow = 399 CFM 71 67 63
Indoor intake air WB temperature (�F)
75
85
95
105
115
Outdoor intake air DB temperature (�F)
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
Total power consumption (kW)
1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7
65
SHF at rating condition = 0.78 Airflow = 533 CFM
71 67 63
Indoor intake air WB temperature (�F)
75
85
95
105
115
Outdoor intake air DB temperature (�F)
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
Total power consumption (kW)
1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.965
SHF at rating condition = 0.87
Airflow = 646 CFM 71 67 63
Indoor intake air WB temperature (�F)
75
85
95
105
115
Outdoor intake air DB temperature (�F)
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Total power consumption (kW)
2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3
65
SHF at rating condition = 0.75 Airflow = 634 CFM
71 67 63
Indoor intake air WB temperature (�F)
75
85
95
105
115
Outdoor intake air DB 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.
OBH733F
27
Heating
Capacity correction factor
Heating capacity (at Rated frequency)
1.3
59
68
1.2 1.1 1.0 0.9 0.8 0.7
Indoor intake air Dry-bulb temperature ( F)
79
0.6
0.5
0.4
-4
5
14
23
32
41
50
59
Outdoor intake air WB temperature (�F)
MUZ-GL09NA
Total power consumption (kW)
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0
-5
Airflow = 406 CFM 75 70 65
Indoor intake air DB temperature (�F)
5
15
25
35
45
55
65
Outdoor intake air WB temperature (�F)
MUZ-GL09NAH
1.0
Airflow = 406 CFM
Total power consumption (kW)
0.8
75
70
65
0.6
0.4
Indoor intake air DB temperature (�F)
0.2-5
5
15
25
35
45
55
65
Outdoor intake air WB temperature (�F)
MUZ-GL12NA
Total power consumption (kW)
1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3
-5
Airflow = 406 CFM 75 70 65
Indoor intake air DB temperature (�F)
5
15
25
35
45
55
65
Outdoor intake air WB temperature (�F)
MUZ-GL15NA
Total power consumption (kW)
2.0 1.7 1.4 1.1 0.8 0.5
-5
Airflow = 463 CFM 75 70 65
Indoor intake air DB temperature (�F)
5
15
25
35
45
55
65
Outdoor intake air WB temperature (�F)
MUZ-GL12NAH
1.6
Airflow = 406 CFM
Total power consumption (kW)
1.3
75
70
65
1.0
0.7
Indoor intake air DB temperature (�F)
0.4-5
5
15
25
35
45
55
65
Outdoor intake air WB temperature (�F)
MUZ-GL15NAH
Total power consumption (kW)
Airflow = 463 CFM
1.8
75
70
65
1.5
1.2 0.9 0.6 -5
Indoor intake air DB temperature (�F)
5
15
25
35
45
55
65
Outdoor intake air WB temperature (�F)
OBH733F
28
MUZ-GL18NA
Total power consumption (kW)
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6-5
Airflow = 646 CFM 75 70 65
Indoor intake air DB temperature (�F)
5
15
25
35
45
55
65
Outdoor intake air WB temperature (�F)
MUZ-GL18NAH
1.9 1.6
Airflow = 646 CFM 75 70 65
Total power consumption (kW)
1.3 1.0 0.7
-5
Indoor intake air DB temperature (�F)
5
15
25
35
45
55
65
Outdoor intake air WB temperature (�F)
Total power consumption (kW)
MUZ-GL24NA
3.0 2.6 2.2
Airflow = 738 CFM 75 70 65
1.8
1.4
Indoor intake air DB temperature (�F)
1.0 0
10
20
30
40
50
60
70
Outdoor intake air WB temperature (�F)
MUZ-GL24NAH
2.8 2.3
Airflow = 738 CFM 75 70 65
Total power consumption (kW)
1.8 1.3 0.8-5
Indoor intake air DB temperature (�F)
5
15
25
35
45
55
65
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.
OBH733F
29
7-3. CONDENSING PRESSURE Cooling
Data are based on the condition of indoor humidity 50 %.
Air flow should be set to High speed.
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA
(PSIG)
450
86
400 350
Indoor DB temperature (�F)
80 75 70
(PSIG) 180
160
Suction pressure
Condensing pressure
140
300
120
100 250
80
20065 70 75 80 85 90 95 100 105 (�F) 6065 Outdoor ambient temperature
86 80 75 70
Indoor DB temperature (�F) 70 75 80 85 90 95 100 105 (�F)
Outdoor ambient temperature
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
(PSIG) 500
Suction pressure
Condensing pressure
450 400
Indoor DB temperature (�F)
350
86
80 (PSIG)
75 70
180
160
140
300
120
100 250
80
20065 70 75 80 85 90 95 100 105 (�F) 6065 Outdoor ambient temperature
86 80 75 70
Indoor DB temperature (�F) 70 75 80 85 90 95 100 105 (�F)
Outdoor ambient temperature
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
(PSIG) 500
450 400
Indoor DB temperature (�F)
86
80
75 70
(PSIG)
180
160
350
140
Suction pressure
Condensing pressure
300
120
100 250
80
20065 70 75 80 85 90 95 100 105 (�F) 6065 Outdoor ambient temperature
86 80 75 70
Indoor DB temperature (�F) 70 75 80 85 90 95 100 105 (�F)
Outdoor ambient temperature
OBH733F
30
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
(PSIG) 500
Suction pressure
Condensing pressure
450 400
Indoor DB temperature (�F)
350
300
86
80 75
(PSIG)
70 180
160
140
120
250
100
86 80 75 70
Indoor DB temperature (�F)
20065 70 75 80 85 90 95 100 105 (�F) 8065 70 75 80 85 90 95 100 105 (�F)
Outdoor ambient temperature
Outdoor ambient temperature
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
(PSIG)
480
86
80
450
75 70
420 390 360
Indoor DB temperature (�F)
Condensing pressure
330
300
270 68 70
75 80 85 90 95 Outdoor ambient temperature
100 105(�F)
Suction pressure
(PSIG) 180
86 170
160
80
150
75
140
70
130 Indoor DB temperature (�F)
120
110 68 70
75 80 85 90 95 Outdoor ambient temperature
100 105(�F)
OBH733F
31
Heating Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost.
MUZ-GL09NA - U1 MUZ-GL09NAH - U1
(PSIG)
450
(PSIG)
200
75
70
400 350
Indoor DB temperature (�F)
75 70 150 65
Indoor DB temperature (�F)
65
100 300
Suction pressure
Condensing pressure
50 250
58Hz
58Hz
200 5
0
15
25
35
45
55
65
75 (�F)
5
Outdoor ambient temperature
15
25
35
45
55
65
Outdoor ambient temperature
MUZ-GL09NA - U8 MUZ-GL09NAH - U8 MUZ-GL12NA MUZ-GL12NAH
(PSIG) 500
(PSIG) 190
450
400 350
Indoor DB temperature (�F)
300
Suction pressure
165 75 70 140 65
115
90
Indoor DB temperature (�F)
75 (�F) 75 70 65
Condensing pressure
250 200
5
65 58Hz
40
15
25
35
45
55
65
75 (�F)
5
Outdoor ambient temperature
58Hz
15
25
35
45
55
65
75 (�F)
Outdoor ambient temperature
OBH733F
32
MUZ-GL15NA MUZ-GL15NAH
(PSIG) 500
450
Indoor DB temperature (�F)
400
Condensing pressure
350
300 250
5
58Hz
15
25
35
45
55
65
Outdoor ambient temperature
75 70 65
(PSIG) 190
165
Suction pressure
140
115
90
65
40
75 (�F)
5
75 70 65 Indoor DB temperature (�F)
58Hz
15
25
35
45
55
65
75 (�F)
Outdoor ambient temperature
MUZ-GL18NA MUZ-GL18NAH
(PSIG) 550
500
(PSIG)
200
75
70
65
175
450 400
Indoor DB temperature (�F)
350
Suction pressure
75 70 65 150
125 100
Indoor DB temperature (�F)
Condensing pressure
300 250
5
75 81Hz
50
15
25
35
45
55
65
75 (�F)
5
Outdoor ambient temperature
81Hz
15
25
35
45
55
65
75 (�F)
Outdoor ambient temperature
MUZ-GL24NA MUZ-GL24NAH
(PSIG) 450
75
425
70
400 375 350
Indoor DB temperature (�F)
65
Condensing pressure
325
300 58Hz
275
250 5
15 25 35 45 55 65 75(�F) Outdoor ambient temperature
Suction pressure
(PSIG) 210 190 170 150 130 110 90 70 50 5
75 70 65
Indoor DB temperature (�F)
58Hz
15 25 35 45 55 65 75(�F) Outdoor ambient temperature
OBH733F
33
7-4. STANDARD OPERATION DATA
Model
MSZ-GL09NA - U1
Total
Item Capacity SHF Input Rated frequency
Indoor unit
Unit Btu/h
-- kW Hz
Cooling 9,000 0.82 0.585
59
Heating 10,900
-- 0.72 73
MSZ-GL09NA
Power supply
Input Fan motor current
V, phase,
Hz
kW
A
0.022 0.24/0.22
0.023 0.25/0.23
Outdoor unit
MUZ-GL09NA - U1 MUZ-GL09NAH - U1
MSZ-GL09NA - U8
Cooling 9,000 0.82 0.585
48
Heating 10,900
-- 0.72 59
MSZ-GL09NA
208/230, 1, 60
0.022 0.24/0.22
0.023 0.25/0.23
MUZ-GL09NA - U8 MUZ-GL09NAH - U8
MSY-GL09NA Cooling 9,000 0.82 0.585 59.5
MSY-GL09NA
0.022 0.24/0.22
MUY-GL09NA
Electrical circuit
Refrigerant circuit
Power supply
V, phase,
Hz
Input
kW
Comp. current
A
Fan motor current
A
Condensing pressure
PSIG
Suction pressure
PSIG
Discharge temperature
�F
Condensing temperature
�F
Suction temperature
�F
Comp. shell bottom temperature �F
Ref. pipe length
ft.
Refrigerant charge (R410A)
Intake air temperature
DB �F WB �F
DB �F Discharge air temperature
WB �F
Fan speed (High)
rpm
Airflow (High)
CFM
Intake air temperature
DB �F WB �F
Fan speed
rpm
Airflow
CFM
0.563 2.67/2.41 0.36/0.33
357 151 146 108 61 144
0.697 3.25/2.94 0.34/0.31
345 107 156 102 44 154
2 lb 5 oz.
80
70
67
60
59
99
56
--
1,020
1,040
367 (Wet)
413
95
47
--
--
900
860
1,229
1,172
208/230, 1, 60
0.563
0.697
2.45/2.21 3.05/2.76
0.36/0.33 0.34/0.31
358
349
149
108
148
155
108
104
63
44
140
144
25
2 lb 9 oz.
80
70
67
60
59
99
56
--
1,020
1,040
367 (Wet)
413
95
47
--
--
900
860
1,229
1,172
0.563 2.63/2.37 0.36/0.33
358 149 154 108 66 152
80 67 59 56 1,020 367 (Wet) 95 -- 900 1,229
Indoor unit
Outdoor unit
OBH733F
34
Total
Electrical circuit
Model Item Capacity SHF Input Rated frequency Indoor unit
Power supply
Input Fan motor current
Unit Btu/h
-- kW Hz
V, phase,
Hz kW A
Outdoor unit
Power supply
V, phase,
Hz
Input
kW
Comp. current
A
Fan motor current
A
Condensing pressure
PSIG
Suction pressure
PSIG
Discharge temperature
�F
Condensing temperature
�F
Suction temperature
�F
Comp. shell bottom temperature �F
Ref. pipe length
ft.
Refrigerant charge (R410A)
Intake air temperature
DB �F WB �F
DB �F Discharge air temperature
WB �F
Fan speed (High)
rpm
Airflow (High)
CFM
Intake air temperature
DB �F WB �F
Fan speed
rpm
Airflow
CFM
MSZ-GL12NA MSY-GL12NA
Cooling
Heating
12,000
14,400
0.77
--
0.920
1.10
70
77
MSZ-GL12NA MSY-GL12NA
MSZ-GL15NA MSY-GL15NA
Cooling
Heating
14,000
18,000
0.78
--
1.080
1.60
56.5
74
MSZ-GL15NA MSY-GL15NA
208/230, 1, 60
0.022
0.023
0.24/0.22
0.25/0.23
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
0.043
0.030
0.43/0.39
0.34/0.31
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
208/230, 1, 60
0.898 4.01/3.62 0.41/0.37
380 133 166 112 60 152
80 67 57 55 1,020 367 (Wet) 95 -- 900 1,229
1.077
1.037
4.86/4.39
4.51/4.08
0.40/0.36
0.41/0.37
402
396
106
138
167
168
115
115
35
61
150
152
25
2 lb 9 oz.
70
80
60
67
110
58
--
56
1,040
1,280
413
498 (Wet)
47
95
43
--
860
910
1,172
1,243
1.570 7.11/6.43 0.40/0.36
427 98 178 120 31 158
70 60 114 -- 1,140 463 47 43 900 1,229
Refrigerant circuit
Indoor unit
Outdoor unit
OBH733F
35
Total
Electrical circuit
Model Item Capacity SHF Input Rated frequency Indoor unit
Power supply
Input Fan motor current
Unit Btu/h
-- kW Hz
V, phase,
Hz kW A
Outdoor unit
Power supply
V, phase,
Hz
Input
kW
Comp. current
A
Fan motor current
A
Condensing pressure
PSIG
Suction pressure
PSIG
Discharge temperature
�F
Condensing temperature
�F
Suction temperature
�F
Comp. shell bottom temperature �F
Ref. pipe length
ft.
Refrigerant charge (R410A)
Intake air temperature
DB �F WB �F
DB �F Discharge air temperature
WB �F
Fan speed (High)
rpm
Airflow (High)
CFM
Intake air temperature
DB �F WB �F
Fan speed
rpm
Airflow
CFM
MSZ-GL18NA MSY-GL18NA
Cooling
Heating
18,000
21,600
0.87
--
1.34
1.68
69
81
MSZ-GL18NA MSY-GL18NA
MSZ-GL24NA MSY-GL24NA
Cooling
Heating
22,500
27,600
0.75
--
1.80
2.34
67.5
82.0
MSZ-GL24NA MSY-GL24NA
208/230, 1, 60
0.045 0.46/0.42 MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
0.058 0.56/0.51 MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
208/230, 1, 60
1.295
1.635
1.742
2.282
5.01/4.53
6.67/6.03
7.01/6.34
9.59/8.67
1.05/0.95
1.05/0.95
1.16/1.05
1.13/1.02
377
391
395
405
144
103
141
102
149
178
158
171
111
111
115
115
51
43
52
33
134
160
140
148
25
3 lb 9 oz.
4 lb 3 oz.
80
70
80
70
67
60
67
60
52
111
56
111
51
--
53
--
1,170
1,170
1,300
1,300
581 (Wet)
646
634 (Wet)
738
95
47
95
47
--
43
--
43
810
810
840
810
1,691
1,691
1,769
1,701
Refrigerant circuit
Indoor unit
Outdoor unit
OBH733F
36
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
Capacity correction factors
Capacity correction factors Input correction factors
Input correction factors
MUZ-GL09NA - U1 MUZ-GL09NAH- U1
Correction of Cooling capacity 2.0
Correction of Cooling total input 2.0
Correction of Heating capacity 2.0
Correction of Heating total input
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
25
50
75
100 (Hz) 0
25
50
75
100 (Hz) 0
50
100
150(Hz) 0
50
100
150 (Hz)
The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor
MUY-GL09NA
Correction of Cooling capacity 2.0
Correction of Cooling total input 2.0
1.5
1.5
1.0
1.0
0.5
0.5
Input correction factors
Capacity correction factors
Input correction factors
Capacity correction factors
Input correction factors
Capacity correction factors
0
25
50
75
100 (Hz) 0
25
50
75
100 (Hz)
The operational frequency of compressor The operational frequency of compressor
MUZ-GL09NA - U8 MUZ-GL09NAH - U8
Correction of Cooling capacity 2.0
Correction of Cooling total input 2.0
Correction of Heating capacity 2.0
Correction of Heating total input
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
Input correction factors
Capacity correction factors
Input correction factors
Capacity correction factors
0
25
50
75
100 (Hz) 0
25
50
75
100 (Hz) 0
25
50
75
100 (Hz) 0
25
50
75
100(Hz)
The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor
MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA
Correction of Cooling capacity 2.0
Correction of Cooling total input 2.0
Correction of Heating capacity 2.0
Correction of Heating total input
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
25
50
75
100 (Hz) 0
25
50
75
100 (Hz) 0
25
50
75
100 (Hz) 0
25
50
75
100(Hz)
The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor
OBH733F
37
Capacity correction factors
Capacity correction factors
Input correction factors
Capacity correction factors
Input correction factors
MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
Correction of Cooling capacity 2.0
Correction of Cooling total input 2.0
Correction of Heating capacity 2.0
Correction of Heating total input
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
25
50
75
100 (Hz) 0
25
50
75
100 (Hz) 0
50
100
150 (Hz) 0
50
100
150(Hz)
The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor
Input correction factors
Capacity correction factors
Input correction factors
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
Correction of Cooling capacity 2.0
Correction of Cooling total input 2.0
2.0 Correction of Heating capacity
Correction of Heating total input
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
Th0e
30 60 90 operational frequency
120 150 (Hz) of compressor
0 The
30 60 90 operational frequency
120 150 (Hz) 0
30 60 90 120 150 (Hz)
of compressor The operational frequency of compressor
0
30 60 90 120 150(Hz)
The operational frequency of compressor
Input correction factors
Capacity correction factors
Input correction factors
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Correction of Cooling capacity 1.5
Correction of Cooling total input 2.5
2.0 1.0
1.5
1.0 0.5
0.5
1.5 Correction of Heating capacity 1.0 0.5
Correction of Heating total input 2.0 1.5 1.0 0.5
0
50
100
150(Hz)
0
50
100
150(Hz)
0
50
100
150(Hz)
The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor
0
50
100
150(Hz)
The operational frequency of compressor
Capacity correction factors
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 the
remote controller.
OBH733F
38
8 ACTUATOR CONTROL
MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA
MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH
MUY-GL09NA MUY-GL12NA MUY-GL15NA MUY-GL18NA MUY-GL24NA
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 ON
15 seconds
Compressor
OFF
ON
Outdoor fan motor
OFF
8-2. R.V. COIL CONTROL (MUZ) Heating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . . . . . . . . . . . . OFF Dry . . . . . . . . . . . . . . . . . . . . OFF NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
<COOL>
<HEAT>
5 seconds
5 seconds
ON Compressor OFF
R.V.coil
ON OFF
Outdoor fan ON
motor
OFF
8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR
Sensor
Purpose
Actuator
Compressor
LEV
Outdoor fan motor
R.V.coil
Indoor fan motor
Defrost heater *
Discharge temperature thermistor
Protection
Indoor coil temperature thermistor
Defrost thermistor (MUZ)
Cooling: Coil frost prevention Heating: High pressure protection Heating: Defrosting
Fin temperature thermistor Protection
Ambient temperature thermistor
Cooling: Low ambient temperature operation Heating: Defrosting (Heater)
Outdoor heat exchanger temperature thermistor
*. MUZ-GL�NAH only.
Cooling: Low ambient temperature operation Cooling: High pressure protection
OBH733F
39
9 SERVICE FUNCTIONS
MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA
MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH
MUY-GL09NA MUY-GL12NA MUY-GL15NA MUY-GL18NA MUY-GL24NA
9-1. CHANGE IN DEFROST SETTING (MUZ)
Changing defrost finish temperature
<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.).
Defrost finish temperature
Jumper
MUZ-GL09/12/15NA MUZ-GL09/12/15NAH
MUZ-GL18/24NA MUZ-GL18/24NAH
Soldered (Initial setting)
JS
None (Cut)
41�F (5�C) 50�F (10�C)
50�F (10�C) 64�F (18�C)
9-2. PRE-HEAT CONTROL SETTING (MUZ) MUZ-GL09/12/15/18 When moisture gets into the refrigerant cycle, it may interfere with the start-up of the compressor at low outside temperature. The pre-heat control prevents this interference. The pre-heat control turns ON when the discharge temperature thermistor is 68�F (20�C) or below. When the pre-heat control turns ON, the compressor is energized. (About 50 W)
MUZ-GL24 Prolonged low load operation, in which the thermostat is OFF for a long time, at low outside temperature [32�F (0�C) or less] may cause the following troubles. The pre-heat control prevents those troubles. 1) If moisture gets into the refrigerant cycle and freezes, it may interfere the start-up of the compressor. 2) If liquid refrigerant collects in the compressor, a failure in the compressor may occur. The pre-heat control turns ON when the compressor temperature is 68�F (20�C) or below. When the pre-heat control turns ON, the compressor is energized. (About 70 W)
Pre-heat control setting <JK> ON: To activate the pre-heat control, cut JK wire of the inverter P.C. board. OFF: To deactivate the pre-heat control, solder JK wire of the inverter P.C. board. (Refer to 10-6.1)
Jumper
Soldered JK
Cut
Pre-heat control setting
MUZ-GL09/12/15/18NA MUZ-GL09/12/15/18NAH
MUZ-GL24NA MUZ-GL24NAH
Deactivated (Factory setting)
Deactivated
Activated
Activated (Factory setting)
NOTE: When the inverter P.C. board is replaced, check the JK wire, and cut/solder them if necessary.
OBH733F
40
10 TROUBLESHOOTING
MUZ-GL09NA MUZ-GL12NA MUZ-GL15NA MUZ-GL18NA MUZ-GL24NA
MUZ-GL09NAH MUZ-GL12NAH MUZ-GL15NAH MUZ-GL18NAH MUZ-GL24NAH
MUY-GL09NA MUY-GL12NA MUY-GL15NA MUY-GL18NA MUY-GL24NA
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 connector housing. DO NOT pull the lead wires.
<Incorrect>
<Correct>
Lead wiring
Connector housing
3. Troubleshooting procedure 1) Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality. To make sure, check how many times the OPERATION INDICATOR lamp is blinking on and off before starting service work. (See the service manual of the indoor unit for a description of those failure codes.) 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.
OBH733F
41
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-GL06/09/12/15NA MSZ-GL18NA MSY-GL09/12/15NA MSY-GL18NA
MSZ-GL24NA MSY-GL24NA
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 OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other 2 buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right figure are all displayed. Then release the buttons.
Press STOP/OPERATE (OFF/ON) 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 the 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 the OPERATION INDICATOR lamp. 2
No (OFF)
Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that cannot be recalled with this way. Check if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function. (Refer to 10-2.2)
Judgment of indoor/outdoor abnormality
Yes (Blinks)
Before blinking, does the upper lamp of the OPERATION
INDICATOR lamp stay ON for 3 seconds?
When it stays ON for 3 seconds (without beep): The outdoor unit
Yes
is abnormal.
No
The indoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the indoor unit failure recall mode table. (Refer to indoor unit service manual.) Make sure to check at least 2 consecutive blinking cycles. 2
The outdoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the outdoor unit failure recall mode table. (Refer to 10-2.3) Make sure to check at least 2 consecutive blinking cycles. 3
E.g.: MSZ type
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 failure 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 STOP/OPERATE (OFF/ON) 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 after 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-
Blinking at 0.5-
2.5-second OFF second interval 2.5-second OFF second interval
ON OFF
Beeps Repeated cycle
Beeps Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.5-
2.5-second OFF 3-second ON
second interval
2.5-second OFF
ON OFF
No beep Repeated cycle
Beeps
OBH733F
42
Beeps Repeated cycle
3-second ON
Blinking at 0.5second interval
No beep Repeated cycle
Beeps
Repeated cycle
2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure
The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures.
Make sure that the remote controller is set to the failure mode recall function.
With the remote controller headed towards the indoor unit, press TOO COOL 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 the 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 the OPERATION INDICATOR lamp. 2
No (OFF)
Yes (Blinks)
The outdoor unit is abnormal. Check the blinking pattern, and identify the abnormal point by referring to the outdoor unit failure recall mode table (10-2.3.). Make sure to check at least 2 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.
The outdoor unit is normal.
Release the failure mode recall function according to the left mentioned procedure.
Repair the failure 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 STOP/OPERATE (OFF/ON) 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 after 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:
ON OFF
2.5-second OFF 3-second ON
No beep Repeated cycle
Blinking at 0.5second interval
Beeps
2.5-second OFF 3-second ON
Blinking at 0.5second interval
No beep Repeated cycle
Beeps
Repeated cycle
OBH733F
43
3. Table of outdoor unit failure mode recall function
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.).
The upper lamp of the OPERATION INDICATOR
lamp (Indoor unit)
Abnormal point (Failure mode/protection)
OFF
1-time blink 2.5 seconds OFF
None (Normal)
Indoor/outdoor communication, receiving error
Indoor/outdoor communication, receiving error
2-time blink Outdoor power system 2.5 seconds OFF
3-time blink 2.5 seconds OFF
Discharge temperature thermistor Defrost thermistor
Fin temperature thermistor
4-time blink 2.5 seconds OFF
P.C. board temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature thermistor
Overcurrent
Compressor synchronous abnormality (Compressor start-up failure protection)
5-time blink Discharge temperature 2.5 seconds OFF
6-time blink High pressure 2.5 seconds OFF
7-time blink Fin temperature/ P.C. board 2.5 seconds temperature OFF
8-time blink Outdoor fan motor 2.5 seconds OFF
9-time blink 2.5 seconds OFF
Non-volatile memory data
Power module (IC700) (MUZ-GL09/12/15/18, MUYGL09/12/15/18) IGBT module (IC700) (MUZ-GL24, MUY-GL24)
LED indication (Outdoor P.C. board)
Condition
Remedy
Indoor/outdoor unit failure mode recall function
Outdoor unit failure mode recall function
--
--
--
--
--
Any signals from the inverter P.C.
�Refer to 10-5. How
--
board cannot be received normally for to check miswiring and
3 minutes. Although the inverter P.C. board
serial signal error. �Refer to 10-5. How
--
sends signal "0", signal "1" has been to check miswiring and
received 30 consecutive times.
serial signal error.
Overcurrent protection cut-out
� Reconnect
operates 3 consecutive times within connectors.
--
1 minute after the compressor gets started.
�Refer to 10-5. "How to check inverter/
compressor".
�Check stop valve.
1-time blink every Thermistor shorts or opens during
�Refer to 10-5.
2.5 seconds
compressor running.
"Check of outdoor
thermistors".
Defective outdoor
3-time blink
thermistors can be
2.5 seconds OFF
4-time blink 2.5 seconds OFF
identified by checking the blinking pattern of
LED.
2-time blink 2.5 seconds OFF
--
11-time blink
Large current flows into the power
� Reconnect
2.5 seconds OFF module (IC700) (MUZ-GL09/12/15/18, compressor connector.
MUY-GL09/12/15/18)/ IGBT module �Refer to 10-5. "How
(IC700) (MUZ-GL24, MUY-GL24).
to check inverter/
--
compressor".
�Check stop valve.
12-time blink
Waveform of compressor current is �Reconnect
2.5 seconds OFF distorted.
compressor connector.
�Refer to 10-5. "How
--
to check inverter/
compressor".
Temperature of discharge temperature �Check refrigerant
thermistor exceeds 241�F (116�C),
circuit and refrigerant
compressor stops.
amount.
--
Compressor can restart if discharge �Refer to 10-5. "Check
--
temperature thermistor reads
of LEV".
212�F (100�C) or less 3 minutes later.
Temperature indoor coil thermistor
�Check refrigerant
--
exceeds 158�F (70�C) in HEAT
circuit and refrigerant
mode. Temperature defrost thermistor amount.
--
exceeds 158�F (70�C) in COOL mode. �Check stop valve.
7-time blink
Temperature of the fin temperature
�Check around outdoor
2.5 seconds OFF thermistor on the inverter P.C. board
unit.
exceeds 167 - 187�F (75 - 86�C) (MUZ- �Check outdoor unit air GL09/12/15/18, MUY-GL09/12/15/18)/167 passage.
- 176�F (75 - 80�C) (MUZ-GL24, MUY- �Refer to 10-5. "Check
GL24), or temperature of P.C. board
of outdoor fan motor".
--
temperature thermistor on the inverter
P.C. board exceeds 162 - 185�F (72 - 85�C) (MUZ-GL09/12/15/18, MUY-
GL09/12/15/18)/158 - 167�F (70 - 75�C) (MUZ-GL24, MUY-GL24).
Outdoor fan has stopped 3 times in a �Refer to 10-5. "Check
row within 30 seconds after outdoor of outdoor fan motor".
--
fan start-up.
Refer to 10-5. "Check
--
of inverter P.C. board".
5-time blink
Non-volatile memory data cannot be �Replace the inverter
2.5 seconds OFF read properly.
P.C. board.
6-time blink
The interface short circuit occurs
�Refer to 10-5. "How
2.5 seconds OFF in the output of the power module
to check inverter/
(IC700) (MUZ-GL09/12/15/18, MUY- compressor".
GL09/12/15/18)/IGBT module (IC700)
(MUZ-GL24, MUY-GL24).
The compressor winding shorts circuit.
OBH733F
44
The upper lamp of the OPERATION INDICATOR
lamp (Indoor unit)
Abnormal point (Failure mode/protection)
10-time blink Discharge temperature 2.5 seconds OFF
11-time blink 2.5 seconds OFF
14-time blink or more 2.5 seconds OFF
DC voltage
Each phase current of compressor Stop valve (Closed valve)
4-way valve/ Pipe temperature
Outdoor refrigerant system abnormality
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.).
LED indication (Outdoor P.C. board)
Condition
Remedy
Indoor/outdoor unit failure mode recall function
Outdoor unit failure mode recall function
Temperature of discharge temperature �Refer to 10-5. "Check
thermistor has been 122�F (50�C) or of LEV".
--
less for 20 minutes.
�Check refrigerant
--
circuit and refrigerant
amount.
8-time blink
DC voltage of inverter cannot be
�Refer to 10-5. "How
2.5 seconds OFF detected normally.
9-time blink
Each phase current of compressor
to check inverter/ compressor".
--
2.5 seconds OFF cannot be detected normally.
14-time blink
Closed valve is detected by
2.5 seconds OFF compressor current.
�Check stop valve.
16-time blink
The 4-way valve does not work
2.5 seconds OFF properly.
�Check the 4-way valve.
The indoor coil thermistor detects an �Replace the inverter
abnormal temperature.
P.C. board.
1-time blink
A closed valve and air trapped in the �Check for a gas leak
2.5 seconds OFF refrigerant circuit are detected based in a connecting piping
on the temperature sensed by the
etc.
indoor and outdoor thermistors and the �Check the stop valve.
current of the compressor.
�Refer to 10-5.
"Check of outdoor
refrigerant circuit".
OBH733F
45
10-3. TROUBLESHOOTING CHECK TABLE
No. Symptom Outdoor unit does not op-
1 erate.
2
LED indication
1-time blink every 2.5 seconds
Abnormal point/ Condition
Outdoor power system
Outdoor thermistors
Condition Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started.
Discharge temperature thermistor, fin temperature thermistor, defrost thermistor, P.C. board temperature thermistor, outdoor heat exchanger temperature thermistor or ambient temperature thermistor shorts or opens during compressor running.
Remedy
�Reconnect connector of compressor. �Refer to 10-5. "How to check inverter/compressor". �Check stop valve. �Refer to 10-5. "Check of outdoor thermistors".
Outdoor control sys- Nonvolatile memory data cannot be read properly.
�Replace inverter P.C. board.
3
tem (The upper lamp of the OPERATION INDICATOR lamp on the
indoor unit lights up or blinks 7-time.)
4
6-time blink
Serial signal
2.5 seconds OFF
The communication fails between the indoor and outdoor unit �Refer to 10-5. "How to check
for 3 minutes.
miswiring and serial signal error.
5
11-time blink
Stop valve/
2.5 seconds OFF Closed valve
Closed valve is detected by compressor current.
�Check stop valve.
16-time blink
4-way valve/
The 4-way valve does not work properly.
�Refer to 10-5. "Check of R.V.
6
2.5 seconds OFF Pipe temperature The indoor coil thermistor detects an abnormal temperature. coil".
�Replace the inverter P.C. board.
17-time blink
Outdoor refrigerant A closed valve and air trapped in the refrigerant circuit are
�Check for a gas leak in a
2.5 seconds OFF system abnormality detected based on the temperature sensed by the indoor and connecting piping etc.
7
outdoor thermistors and the current of the compressor.
�Check the stop valve.
�Refer to 10-5. "Check of outdoor
refrigerant circuit".
'Outdoor unit 2-time blink
Overcurrent protec- Large current flows into the power module (IC700) (MUZ-
stops and 2.5 seconds OFF tion
GL09/12/15/18, MUY-GL09/12/15/18)/ IGBT module (IC700)
8 restarts 3
(MUZ-GL24, MUY-GL24).
� Reconnect connector of compressor. �Refer to 10-5. "How to check inverter/compressor".
minutes later'
is repeated. 3-time blink
Discharge tem-
9
2.5 seconds OFF perature overheat protection
�Check stop valve.
Temperature of discharge temperature thermistor exceeds �Check refrigerant circuit and refrig241�F (116�C), compressor stops. Compressor can restart if erant amount. discharge temperature thermistor reads 212�F (100�C) or less �Refer to 10-5. "Check of LEV". 3 minutes later.
4-time blink
Fin temperature
Temperature of the fin temperature thermistor on the heat sink �Check around outdoor unit.
2.5 seconds OFF /P.C. board tem-
exceeds 167 - 187�F (75 - 86�C) (MUZ-GL09/12/15/18, MUY- �Check outdoor unit air passage.
perature thermistor GL09/12/15/18)/167 - 176�F (75 - 80�C) (MUZ-GL24, MUY- �Refer to 10-5. "Check of outdoor
10
overheat protection GL24) or temperature of P.C. board temperature thermistor on fan motor".
the inverter P.C.board exceeds 162 - 185�F (72 - 85�C) (MUZ-
GL09/12/15/18, MUY-GL09/12/15/18)/158 - 167�F (70 - 75�C)
(MUZ-GL24, MUY-GL24).
5-time blink
High pressure pro- Indoor coil thermistor exceeds 158�F (70�C) in HEAT mode. �Check refrigerant circuit and refrig-
11
2.5 seconds OFF tection
Defrost thermistor exceeds 158�F (70�C) in COOL mode.
erant amount.
�Check stop valve.
8-time blink
Compressor syn- The waveform of compressor current is distorted.
� Reconnect connector of compressor.
12
2.5 seconds OFF chronous abnormal-
�Refer to 10-5. "How to check
ity
inverter/compressor".
10-time blink
Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds �Refer to 10-5. "Check of outdoor
13
2.5 seconds OFF
after outdoor fan start-up.
fan motor. �Refer to 10-5. "Check of inverter
P.C. board.
14
12-time blink
Each phase current Each phase current of compressor cannot be detected nor-
2.5 seconds OFF of compressor
mally.
�Refer to 10-5. "How to check inverter/compressor".
13-time blink
DC voltage
DC voltage of inverter cannot be detected normally.
�It occurs with following case.
2.5 seconds OFF
Instantaneous power voltage drop.
(Short time power failure) (MUZ-
15
GL24, MUY-GL24) �Refer to 10-5. "Check of power
supply". (MUZ-GL24, MUY-GL24)
�Refer to 10-5. "How to check inverter/compressor".
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 10-6.1. 2. LED is lighted during normal operation. 3. Blinking patterns of this mode differ from the ones of the failure recall mode.
Inverter P.C. board MUZ-GL09/12/15/18NA(H)
MUY-GL09/12/15/18NA
MUZ-GL24NA(H) MUY-GL24NA
The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the blinking frequency is "2".
0.5-second ON
0.5-second ON
Blinking LED
Blinking
LED
ON OFF
2.5-second OFF
2.5-second OFF
OBH733F
46
No. Symptom Outdoor unit operates.
16
17
18
19
LED indication
1-time blink 2.5 seconds OFF
Abnormal point/ Condition
Frequency drop by current protection
MUZ-GL09/12/15/18 MUY-GL09/12/15/18 MUZ-GL24 MUY-GL24
Condition
When the input current exceeds approximately 10.5A, compressor frequency lowers.
Current from power outlet is nearing breaker capacity.
Remedy
The unit is normal, but check the following. �Check if indoor filters are clogged. �Check if refrigerant is short. �Check if indoor/outdoor unit air circulation is short cycled.
3-time blink 2.5 seconds OFF
4-time blink 2.5 seconds OFF
5-time blink 2.5 seconds OFF
Frequency drop by high pressure protection
Frequency drop by defrosting in COOL mode
Frequency drop by discharge temperature protection
Outside temperature thermistor protection
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.
When the outside temperature thermistor shorts or opens, protective operation without that thermistors is performed.
�Check refrigerant circuit and refrigerant amount. �Refer to 10-5. "Check of LEV". �Refer to 10-5. "Check of outdoor thermistors".
�Refer to 10-5. Check of outdoor thermistors.
Outdoor unit 20 operates.
21
22
7-time blink 2.5 seconds OFF 8-time blink 2.5 seconds OFF
9-time blink 2.5 seconds OFF
Low discharge tem- Temperature of discharge temperature thermistor has been perature protection 122�F (50�C) or less for 20 minutes.
MUZ-GL09/12/15/18 MUY-GL09/12/15/18 PAM protection PAM: Pulse Amplitude Modulation
The overcurrent flows into PFC (Power factor correction :IC820) or the DC voltage reaches 394 V or more, PAM stops and restarts.
MUZ-GL24 MUY-GL24
Zero cross signal cannot be detected.
Zero cross detecting
circuit
Inverter check mode The connector of compressor is disconnected, inverter check mode starts.
�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.
�It occurs with following cases. 1 Instantaneous power voltage drop. (Short time power failure) 2 Distortion of primary voltage
�Refer to 10-5. "Check of power supply".
�Check if the connector of the compressor is correctly connected. Refer to 10-5. "How to check inverter/compressor".
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 10-6.1. 2. LED is lighted during normal operation. 3. Blinking patterns of this mode differ from the ones of the failure recall mode.
The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the blinking frequency is "2".
Inverter P.C. board MUZ-GL09/12/15/18(H)
MUY-GL09/12/15/18NA
MUZ-GL24NA(H) MUY-GL24NA
ON OFF
2.5-second OFF
0.5-second ON 2.5-second OFF
0.5-second ON
Blinking LED
Blinking
LED
OBH733F
47
10-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Part name
Defrost thermistor (RT61) (MUZ)
Check method and criterion
Fin temperature thermistor (RT64)
Ambient temperature thermistor (RT65)
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.
Outdoor heat exchanger temperature thermistor (RT68)
Discharge temperature thermistor (RT62)
Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.
Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C. board", for the chart of thermistor.
Measure the resistance between terminals using a tester. [Temperature: 14 - 104�F (-10 - 40�C)]
Compressor
Normal ()
MUZ-GL09NA(H) - U1
MUY-GL09
MUZ-GL09NA(H) - U8
MUZ-GL12 MUY-GL12
MUZ-GL15/18 MUY-GL15/18
MUZ-GL24 MUY-GL24
U-V U-W V-W
1.26 - 1.72
1.60 - 2.17
0.82 - 1.11 0.87 - 1.18
Outdoor fan motor
Measure the resistance between lead wires using a tester. [Temperature: 14 - 104�F (-10 - 40�C)]
Color of lead wire
RED � BLK BLK � WHT WHT � RED
Normal () MUZ-GL09/12/15 MUZ-GL18/24 MUY-GL09/12/15 MUY-GL18/24
29 - 40
12 - 16
R. V. coil (21S4)
Measure the resistance using a tester. [Temperature: 14 - 104�F (-10 - 40�C)]
Normal (k) 0.97 - 1.38
Expansion valve coil (LEV)
Defrost heater (MUZ-GL�NAH)
OBH733F
Measure the resistance using a tester. [Temperature: 14 - 104�F (-10 - 40�C)]
Color of lead wire
Normal ()
RED � ORN
RED � WHT RED � BLU RED � YLW
37 - 54
Measure the resistance using a tester. [Temperature: 14 - 104�F (-10 - 40�C)]
Normal () 349 - 428
48
Figure
WHT RED BLK
W
V
U
WHT RED BLK
W
V
U
WHT
LEV
ORN RED (+12V)
YLW BLU
10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor
Disconnect the connector between the compressor and the power module (IC700) (MUZ-GL09/12/15/18, MUY-GL09/12/15/18)/IGBT module (IC700) (MUZGL24, MUY-GL24).
Check the voltage between terminals.
See 10-5. "Check of open phase".
Are the voltages balanced? Yes
Check the compressor.
No
Replace the inverter P.C. board.
See 10-5. "Check of compressor".
B Check of open phase
With the connector between the compressor and the power module (IC700) (MUZ-GL09/12/15/18, MUY-GL09/12/15/18)/IGBT module (IC700) (MUZ-GL24, MUY-GL24) 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)
Measure AC voltage between the lead wires at 3 points.
BLK (U)-RED (W)
WHT(V)-RED (W)
NOTE: 1. Output voltage varies according to power supply voltage. 2. Measure the voltage by analog type tester. 3. During this check, LED of the inverter P.C. board blinks 9 times. (Refer to 10-6.1.)
C Check of compressor
Refer to 10-5. "Check of compressor
winding". Is the compressor normal?
No
Yes
Refer to 10-5. "Check of compressor
operation time". Does the compressor operate continuously?
No
Yes
OK
Replace the compressor. Refer to 10-5. "Check of compressor start failure".
OBH733F
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D Check of compressor winding
Disconnect the connector between the compressor and the power module (IC700) (MUZ-GL09/12/15/18, MUY-GL09/12/15/18)/ IGBT module (IC700) (MUZ-GL24, MUY-GL24), 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 [] ����������������Abnormal [short]
Infinite [] �������Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement.
E Check of compressor operation time
Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to overcurrent. <<Operation method>> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION: Refer to 7-6.) <<Measurement>> Measure the time from the start of compressor to the stop of compressor due to overcurrent.
<<Judgement>> 0 second 1 second 2 seconds
10 seconds
F Check of compressor start failure
10 minutes
Compressor starts Abnormal (IC700 failure) (Compressor winding short) Abnormal (Compressor lock out) (Starting defect) Abnormal (Poor contact) (Inverter P.C. board defect) (Disconnected connector) Abnormal (Refrigerant circuit defect) (Closed valve)
Normal
Confirm that ~ is normal. �Electrical circuit check
. Contact of the compressor connector . Output voltage of inverter P.C. board and balance of them (See 10-5. ) . Direct current voltage between DB61(+) and (-) (MUZ-GL09/12/15/18,
MUY-GL09/12/15/18)/ JP715(+) and JP30(-) (MUZ-GL24, MUY-GL24), on
the inverter P.C. board . Voltage between outdoor terminal block S1-S2
Does the compressor run for 10 seconds or
Check the refrigerant circuit.
more after it starts?
Yes Check the stop valve.
No
After the compressor is heated with a drier,
does the compressor start? 1
No
Yes
Compressor start failure. Activate pre-heat control. (Refer to 9-2. "PRE-HEAT CONTROL SETTING")
Replace the compressor.
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50
1 Heat the compressor with a drier for about 20 minutes. Do not recover refrigerant gas while heating.
Heating part
G Check of outdoor thermistors
Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor.
Is the resistance of thermistor normal? (Refer to 10-6.1.)
Yes
Replace the thermistor except RT64.
When RT64 is abnormal, replace the inverter P.C.
No
board.
Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch.
Does the unit operate for 10 minutes or more
without showing thermistor abnormality?
No
Yes
Replace the inverter P.C. board.
OK (Cause is poor contact.)
MUZ-GL09/12/15/18, MUY-GL09/12/15/18
Thermistor
Symbol
Connector, Pin No.
Defrost (MUZ)
RT61 Between CN641 pin1 and pin2
Discharge temperature
RT62 Between CN641 pin3 and pin4
Fin temperature
RT64 Between CN642 pin1 and pin2
Ambient temperature
RT65 Between CN643 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3
MUZ-GL24, MUY-GL24
Thermistor Defrost (MUZ)
Symbol
Connector, Pin No.
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
Board Inverter P.C. board
Board Inverter P.C. board
OBH733F
51
H Check of R.V. coil (MUZ)
MUZ-GL09/12/15/18NA MUZ-GL09/12/15/18NAH
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil. Check if CN721 is connected.
Unit operates in COOL mode even if it is set to HEAT mode.
Disconnect connector between the compressor and the power module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode).
Is there 208/230 V AC between CN721 and on the inverter P.C. board 3 minutes after the power supply is turned No ON?
Yes
Replace the inverter P.C. board.
Replace the 4-way valve.
Unit operates in HEAT mode even if it is set to COOL mode.
Disconnect connector between the compressor and the power module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).
Is there 208/230 V AC between CN721
and on the inverter P.C. board
Replace the inverter
3 minutes after the power supply is turned Yes P.C. board.
ON?
No
Replace the 4-way valve.
MUZ-GL24NA MUZ-GL24NAH
First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. In case CN602 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 CN602 is connected.
Unit operates in COOL mode even if it is set to HEAT mode.
Disconnect connector between the compressor and the IGBT module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode).
Is there 208/230 V AC between CN602 and on the inverter P.C. board 3 minutes after the power supply is turned No ON?
Yes
Replace the inverter P.C. board.
Replace the 4-way valve.
Unit operates in HEAT mode even if it is set to COOL mode.
Disconnect connector between the compressor and the IGBT module (IC700). Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode).
Is there 208/230 V AC between CN602
and on the inverter P.C. board
Replace the inverter
3 minutes after the power supply is turned Yes P.C. board.
ON?
No
Replace the 4-way valve.
OBH733F
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I Check of outdoor fan motor
Check the connection between the connector CN931 and CN932. Disconnect the connectors CN931 and CN932 from the inverter P.C. board.
Is the resistance between each ter-
minal of outdoor fan motor normal? (Refer to 10-4.)
Yes
No
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 V DC) No
No Replace the outdoor fan motor.
Does the voltage between each terminal become 5 and 0 V DC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly? Yes
Replace the inverter P.C. board.
OBH733F
53
J Check of power supply
Disconnect the connector between the compressor and the power module (IC700) (MUZ-GL09/12/15/18, MUYGL09/12/15/18)/IGBT module (IC700) (MUZ-GL24, MUY-GL24). Turn ON power supply and press EMERGENCY OPERATION switch.
Does the upper lamp of the
OPERATION INDICATOR lamp on the indoor unit light up?
No
Yes
Rectify indoor/outdoor connecting wire.
No
Is there voltage 208/230 V AC between the indoor terminal block S1 and S2?
Replace the indoor
Yes
electronic control P.C. board.
Is there DC voltage 260 - 370 V DC
between DB61 (+) and DB61 (�)
(MUZ-GL09/12/15/18, MUY-
GL09/12/15/18)/294 - 370 V DC between JP715 (+) and JP30 (�)
Yes
(MUZ-GL24, MUY-GL24) on the
inverter P.C. board? (Refer to 10-6.1.)
No
Check the electric parts in main circuit.
Does LED on the inverter P.C. board light up or blink? (Refer to 10-6.1.)
No
Replace the inverter P.C. board.
Yes
If lights up, OK. If blinks, refer to 10-3.
DB61
260 - 370 V DC
Inverter P.C. board (Solder side)
MUZ-GL09/12/15/18NA MUZ-GL09/12/15/18NAH MUY-GL09/12/15/18NA
294 -370 V DC
JP715
JP30
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
OBH733F
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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. Hold down the other 2 buttons for another 3 seconds. Make sure that the indicators on the LCD screen shown in the right figure are all displayed. Then release the buttons.
MSZ-GL06/09/12/15NA MSZ-GL18NA MSY-GL09/12/15NA MSY-GL18NA
MSZ-GL24NA MSY-GL24NA
Press STOP/OPERATE (OFF/ON) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1
Expansion valve operates in full-opening direction.
E.g.: MSZ type
Do you hear the expansion valve "click,
click�������"? Do you feel the expansion valve vibrates Yes
OK
when touching it ?
No
1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.
Is LEV coil properly fixed to
the expansion valve?
No
Yes
Does the resistance of LEV
coil have the characteristics? (Refer to 10-4.)
Yes
No
Replace the LEV coil.
Properly fix the LEV coil to the expansion valve.
Measure each voltage between connector pins of CN724 on the inverter P.C. board. 1. Pin (-) -- Pin (+) 2. Pin (-) -- Pin (+) 3. Pin (-) -- Pin (+) 4. Pin (-) -- Pin (+) Is there about 3 - 5 V AC between each? NOTE: Measure the voltage by an analog
tester.
Yes
Replace the inverter P.C. No board.
Replace the expansion valve.
NOTE: After check of LEV, do the undermentioned operations. 1. Turn OFF the power supply and turn it ON again. 2. Press RESET button on the remote controller.
OBH733F
55
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 LED indication on the in-
verter P.C. board. Does the LED blink 10 times?
No
Yes (10-time blink)
Check the corresponding parts following LED indication. (Refer to 10-3.)
Replace the inverter P.C. board.
OBH733F
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M How to check miswiring and serial signal error
MUZ-GL09/12/15NA MUZ-GL09/12/15NAH MUY-GL09/12/15NA
Turn OFF the power supply.
Is there rated voltage in the power supply? No Yes
Turn ON the power supply.
Check the power supply.
Is there rated voltage between the outdoor terminal block S1 and S2? Yes
No
Press EMERGENCY OPERATION switch once.
Check the wiring.
Does the left lamp of OPERATION INDICATOR
lamp light up? <Confirmation of the power to
the indoor unit>
No
Yes
Is serial signal error indicated 6 minutes later? No Yes
Is there any miswiring,
poor contact, or wire
disconnection of the indoor/outdoor connect-
Yes
Correct them.
ing wire?
No
A
Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not miswiring. Bridge the outdoor terminal block S2 and S3. 1
Turn ON the power supply.
1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts.
3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board is normal, LED blinks 6 times after 3 minutes.
Is the bus-bar voltage of the inverter P.C. board normal? (Refer to "TEST POINT DIAGRAM AND VOLTAGE" in the outdoor service manual.)
Yes
No Check of power supply.
Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3
Yes
Turn OFF the power supply. Remove the bridge between the outdoor terminal block S2 and S3. Turn ON the power supply.
No (Lighted or not lighted)
Replace the inverter P.C. board . 2
2. Be careful of the residual voltage of smoothing capacitor.
Is there rated voltage between the indoor terminal block S1 and S2? <Confirmation of power voltage>
Yes
Check the wiring
If there are any error of the indoor/outdoor connecting wire:
No
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 amplitude of 10 to 20 V DC between the indoor terminal block
S2 and S3? <Confirmation of serial signal>
No
A � Turn OFF inverter-controlled lighting
equipment. � Turn OFF the power supply and then
turn ON again. � Press EMERGENCY OPERATION
switch.
Is serial signal error indicated 6 minutes later?
Yes
B
� Reinstall
either the unit
or the light
away from
each other.
No
� Attach a filter on remote
control receiv-
ing section
of the indoor
unit.
Yes
Is there 2 V DC or less between CN202 (+)
and JPG (GND)(-) on the indoor electronic
control P.C. board?
Yes
No
Is there 2 V DC or less between
CN202A (+) and JPG (GND)(-)
on the indoor electronic control P.C.
board?
No
Yes
Is there 2 V DC or less between
CN202 (+) and JPG (GND)(-) on
the indoor electronic control P.C.
Yes
board?
No
Replace the indoor power P.C. board.
Replace the indoor electronic control P.C. board.
OBH733F
57
MUZ-GL18/24NA MUZ-GL18/24NAH MUY-GL18/24NA
Turn OFF the power supply.
Is there rated voltage in the power supply? No Yes
Turn ON the power supply.
Check the power supply.
Is there rated voltage between outdoor terminal block S1 and S2? No Yes
Press EMERGENCY OPERATION switch once.
Check the wiring.
Does the OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>
Yes
Is serial signal error indicated 6 minutes later?
Yes
No
Is there any miswiring,
poor contact, or wire
No
disconnection of the indoor/outdoor connect-
Yes
Correct them.
ing wire?
No
A
Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not miswiring. Bridge the outdoor terminal block S2 and S3. 1
Turn ON the power supply.
1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts.
3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes. (Except for outdoor unit of multi system type)
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 the outdoor service manual.)
No
Yes
Does the LED on the inverter P.C. board or the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3
Yes
No (Lighted or not lighted)
Replace the inverter P.C. board or the outdoor electronic control P.C. board. 2
2. Be careful of the residual voltage of smoothing capacitor.
Turn OFF the power supply. Remove the bridge between outdoor terminal block S2 and S3.
GL18
GL24
Turn on the power supply.
Replace the indoor electronic control P.C. board.
Is there amplitude of 10 to 20 V DC between the indoor terminal block
S2 and S3? <Confirmation of serial signal>
No
Yes A
� Turn OFF inverter-controlled lighting equipment.
� Turn OFF the power supply and then turn ON again.
� Press EMERGENCY OPERATION switch.
Is serial signal error indicated 6 minutes later?
Yes
B
� Reinstall
either the unit
or the light
away from
each other.
No
� Attach a filter on remote
control receiv-
ing section
of the indoor
unit.
Is there 2 V DC or less between CN10A (+)
and GND (-) on the indoor electronic control
P.C. board?
Yes
No
Is there 2 V DC or less between
CN10A (+) and GND (-) on
the indoor electronic control P.C.
board?
No
Yes
Is there 2 V DC or less between
CN10A (+) and GND (-) on
the indoor electronic control P.C.
Yes
board?
No
Replace the indoor power P.C. board.
Replace the indoor electronic control P.C. board.
OBH733F
58
N Check of defrost heater (base pan heater) (MUZ-GL�NAH)
MUZ-GL09/12/15/18/24NAH
Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 10-6.1. 2. Is the resistance of defrost heater normal? Refer to 10-4. 3. Does the heater protector remain conducted (not open)? 4. Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors?
In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 32�F (0�C) or below, and let the defrost thermistor continue to read 30�F (-1�C) or below.
NOTE: In case both thermistors are more than the above temperature, cool them with cold water etc...
Is there 208/230 V AC between CN601 and
(MUZ-GL24NAH)/CN722 and (Other models) on the inverter P.C. board? Refer to 10-6.1.
Yes
No
Not the problem of the inverter P.C. board.
Replace the inverter P.C. board.
O Check of outdoor refrigerant circuit
Has the operation stopped during pump down?
Yes
No
Was the operation started with the stop valve closed, and was it opened during operation?
The unit occasionally stops when the stop valve is opened or closed during Yes operation. Open the stop valve and start the cooling operation again.
No
The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit. Close the stop valve, and disconnect the power plug or turn OFF the breaker.
The refrigerant gas amount may be 60% or less than the normal amount. Identify where the gas is leaking from, and fix the leak.
CAUTION : Do not start the operation again to prevent hazards.
OBH733F
59
P Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Ground the unit.
No
Yes
Is the distance between the antennas and the indoor unit within 9.91 ft. (3m), or is the distance between the antennas Yes and the outdoor unit within 9.91 ft. (3m)?
No
Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.
Is the distance between the TV sets or ra-
dios and the indoor unit within 3.28 ft. (1m),
or is the distance between the TV sets or
radios and the outdoor unit within
Yes
9.91 ft. (3m)?
No
Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.
Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the anten- Yes na wiring?
No
Replace or repair the antenna. Replace or repair the coaxial cable.
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
Yes
No
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 fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring). Check the following 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, ground wire, antennas, wiring from antennas, receiver 5. Electric field intensity of the broadcast station affected by the electromagnetic noise 6. Presence or absence of amplifier such as booster 7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise.
2) Within 3 minutes after turning ON the power supply, press STOP/OPERATE (OFF/ON) 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 STOP/OPERATE (OFF/ON) 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.
OBH733F
60
10-6. TEST POINT DIAGRAM AND VOLTAGE
1. Inverter P.C. board
MUZ-GL09/12/15NA
MUZ-GL09/12/15NAH MUY-GL09/12/15NA
Back side of unit
Smoothing capacitor (C63)
DB61
260 - 370 V DC
(-)
(+)
Smoothing capacitor (C62)
R.V.coil/21S4
(CN721)
Heater connector
Smoothing capacitor (C61)
(MUZ) 208/230
V AC
(CN722) (MUZ-GL09/ 12/15NAH)
208/230 V AC
Fuse (F801) T3.15AL250V
Fuse (F701) T3.15AL250V
Fuse (F901) T3.15AL250V
Output to drive outdoor fan motor (CN932)
Output to drive compressor (LDU, LDV, LDW)
Fin temperature thermistor/RT64 (CN642) Signal of outdoor fan motor (CN931) Ambient temperature thermistor/RT65 (CN643) Defrost thermistor /RT61(CN641)(MUZ) Discharge temperature thermistor/RT62 (CN641) Outdoor heat exchanger temperature thermistor /RT68 (CN644) Expansion valve/LEV (CN724)
LED Front side of unit
208/230 V AC Jumper wire for preheat control setting (JK)
Jumper wire for changing defrost setting (JS)
5HVLVWDQFHN
Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 100
90
80
Discharge temperature thermistor (RT62)
70
800
700
60
600
50
500
40
400
30
300
20
200
10
100
0 -4 14 32 50 68 86 104 Temperature (�F)
0 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature (�F)
OBH733F
61
5HVLVWDQFHN 5HVLVWDQFHN
Fin temperature thermistor (RT64) 200 180 160 140 120 100
80 60 40 20
0 32 50 68 86 104 122 140 158 176 Temperature (�F)
MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
Back side of unit
208/230 V AC
DB61
260 - 370 V DC
(-)
(+)
Smoothing capacitor (C63)
Smoothing capacitor (C62)
Smoothing capacitor (C61)
Fuse (F801) T3.15AL250V
R.V.coil/21S4 (CN721) (MUZ) 208/230 V AC
Heater connector (CN722) (MUZ-GL18NAH)
Fuse (F701) T3.15AL250V
Fuse (F901) T3.15AL250V
Output to drive outdoor fan motor (CN932)
Output to drive compressor (LDU, LDV, LDW)
208/230 V AC
LED Front side of unit
Jumper wire for changing defrost setting (JS)
Jumper wire for pre-heat control setting (JK)
Fin temperature thermistor/RT64 (CN642) Signal of outdoor fan motor (CN931) Ambient temperature thermistor/RT65 (CN643) Defrost thermistor /RT61(CN641) (MUZ) Discharge temperature thermistor/RT62 (CN641) Outdoor heat exchanger temperature thermistor /RT68 (CN644) Expansion valve/LEV (CN724)
5HVLVWDQFHN 5HVLVWDQFHN
5HVLVWDQFHN
Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) 100
90
80
Discharge temperature thermistor (RT62)
70
800
700 60
600
50
500
40
400
30
300
20
200
10
100
0 -4 14 32 50 68 86 104 Temperature (�F)
0 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature (�F)
Fin temperature thermistor (RT64) 200 180 160 140 120 100
80 60 40 20
0 32 50 68 86 104 122 140 158 176 Temperature (�F)
OBH733F
62
MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
Heater connector (CN601) (MUZ-GL24NAH)
Fuse (F601) T3.15AL250V
R.V. coil/21S4 (CN602) 208/230 V AC (MUZ)
Signal of outdoor fan motor (CN931)
Fuse (F901) T3.15AL250V Output to drive outdoor fan motor (CN932) Fuse (F880) T3.15AL250V
JP715 (+) 294 - 370 V DC
JP30 (-)
Expansion valve/LEV (CN724)
LED
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)
Jumper wire for changing defrost setting (JS)
Jumper wire for pre-heat control setting (JK)
Resistance(k ) 5HVLVWDQFHN
Resistance(k )
Defrost thermistor (RT61) (MUZ) Ambient temperature thermistor (RT65) 100 Outdoor heat exchanger temperature thermistor (RT68)
90
80
Discharge temperature thermistor (RT62)
70
800
700 60
600
50
500
40
400
30
300
20
200
10
100
0-4 14 32 50 68 86 104 Temperature (�F)
0 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature (�F)
OBH733F
63
200 Fin temperature thermistor (RT64) 180 160 140 120 100
80 60 40 20
032 50 68 86 104 122 140 158 176 Temperature (�F)
11 DISASSEMBLY INSTRUCTIONS
<Detaching method of the terminals with locking mechanism>
The terminal which has the locking mechanism can be detached as shown below. There are 2 types of the terminals 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
(2) The terminal with this connector shown below has the locking mechanism.
Locking lever
Slide the sleeve. Pull the terminal while pushing the locking lever.
11-1. MUZ-GL09NA MUZ-GL09NAH MUY-GL09NA MUZ-GL12NA MUZ-GL12NAH MUY-GL12NA MUZ-GL15NA MUZ-GL15NAH MUY-GL15NA
NOTE: Turn OFF the power supply before disassembly.
OPERATING PROCEDURE
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. (Photo 4) (5) Remove the screw fixing the conduit plate. (Photo 5) (6) Remove the conduit plate. (7) Disconnect the power supply wire and indoor/outdoor connecting wire. (8) Remove the screws fixing the top panel. (9) Remove the top panel. (10) Remove the screws fixing the cabinet. (11) Remove the cabinet. (12) Remove the screws fixing the back panel. (13) Remove the back panel.
Photo 1
Hold the sleeve, and pull out the terminal slowly.
Connector
: Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures.
PHOTOS/FIGURES
Screws of the top panel
Back panel
Screws of the back panel
Photo 2
Screws of the top panel
Screws of the cabinet
Photo 3
Screw of the cabinet
Service panel
Screws of the terminal block support and the back panel
Screws of the cabinet
OBH733F
Screws of the cabinet
64
Direction to remove
Hooks
Photo 4
OPERATING PROCEDURE
Screws of the conduit cover
Photo 5
PHOTOS/FIGURES
Screw of the conduit plate
2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) CN722 (Defrost heater and heater protector) (MUZGL09/12/15NAH) 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 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 terminal 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.
3. Removing R.V. coil (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) (3) Remove the R.V. coil.
Photo 6
Screws of the heat sink support and the separator
Screws of the terminal block support and the back panel
Photo 7 Heat sink Heat sink support
P.C. board support
Screw of the Terminal block support
Terminal block support
OBH733F
Screw of the inverter P.C. board
Screw of the ground wire
65
OPERATING PROCEDURE
4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN641 (Defrost thermistor (MUZ) and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (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.
Photo 8
PHOTOS/FIGURES
Screw of the R.V. coil (MUZ)
Discharge temperature thermistor Photo 9
Ambient temperature thermistor
Outdoor heat exchanger temperature thermistor
Defrost thermistor (MUZ)
OBH733F
66
OPERATING PROCEDURE
5. Removing outdoor fan motor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor. NOTE: The propeller fan nut is a reverse thread.
Photo 10
PHOTOS/FIGURES
Screws of the outdoor fan motor
Propeller fan
6. Removing the compressor and 4-way valve (1) Remove the cabinet and panels. (Refer to section 1.) (2) Remove the inverter assembly. (Refer to section 2.) (3) Remove the screws fixing the reactor. (4) Remove the reactor. (5) Remove the soundproof felt. (6) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG. (7) Detach the brazed part of the suction and the discharge pipe connected with compressor. (8) Remove the nuts fixing the compressor. (9) Remove the compressor. (10) Detach the brazed part of pipes connected with 4-way valve.
Photo 11
Screws of the reactor
Propeller fan nut
Photo 12
Discharge pipe brazed part
OBH733F
Soundproof felt
Suction pipe brazed part
Brazed parts of 4-way valve
67
11-2. MUZ-GL18NA MUZ-GL18NAH MUY-GL18NA
NOTE: Turn OFF the power supply before disassembly.
OPERATING PROCEDURE
PHOTOS/FIGURES
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 screw of fixing the conduit plate. (8) Remove the conduit plate. (9) Remove the top panel. (10) Remove the valve cover. (11) Disconnect the power supply and indoor/outdoor connecting wire. (12) Remove the screws of the cabinet. (13) Remove the cabinet. (14) Remove the screws of the back panel. (15) Remove the back panel.
Photo 1 Screws of the top panel
Screws of the cabinet
Photo 3 Screws of the conduit cover
Screws of the cabinet
Screws of the cabinet
Photo 4 Screw of the conduit plate
Photo 2
Screw of the back panel Screws of the cabinet
Screws of the top panel Screw of the valve cover
OBH733F
Screws of the cabinet
Screws of the back panel
Screws of the service panel
68
OPERATING PROCEDURE
PHOTOS/FIGURES
2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) CN722 (Defrost heater) (MUZ-GL18NAH) 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. (4) Remove the screw 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, screw of the P.C. board cover and screws of the terminal 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 the inverter P.C. board from the P.C. board support.
Photo 5
Screw of the heat sink support and the separator
Screws of the terminal block support and the back panel
Photo 6
Heat sink
Heat sink support
3. Removing R.V. coil (MUZ) (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connector: <Inverter P.C. board> CN721 (R.V. coil) (MUZ) (3) Remove the R.V. coil.
P.C. board support
Screw of the P.C. board cover
Photo 7
Screw of the inverter P.C. board
Screw of the R.V. coil (MUZ)
Screw of the ground wire
Screws of the terminal block support
Brazed parts of 4-way valve
OBH733F
69
OPERATING PROCEDURE
4. Removing the discharge temperature thermistor, defrost thermistor (MUZ), outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN641 (Defrost thermistor (MUZ) and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (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.
Photo 8
PHOTOS/FIGURES
Outdoor heat exchanger temperature thermistor
Ambient temperature thermistor
5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931 and CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor. NOTE: The propeller fan nut is a reverse thread.
Photo 9
Defrost thermistor (MUZ) Propeller fan nut
6. Removing the compressor and 4-way valve (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Remove the back panel. (Refer to section 1.) (3) Remove the inverter assembly. (Refer to section 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 pipe connected with compressor.
(6) Remove the compressor nuts. (7) Remove the compressor. (8) Detach the brazed part of 4-way valve and pipe. (Photo 7)
OBH733F
70
Photo 10
Screws of the outdoor fan motor
Brazed part of the discharge pipe
Discharge temperature thermistor
Brazed part of the suction pipe
11-3. MUZ-GL24NA MUZ-GL24NAH MUY-GL24NA
NOTE: Turn OFF the power supply before disassembly.
OPERATING PROCEDURE
PHOTOS/FIGURES
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 connecting wire. (10) Remove the screws of the cabinet. (11) Remove the cabinet. (12) Remove the screws of the back panel.
(13) Remove the back panel.
Photo 1 Screws of the top panel
Screws of the cabinet
Photo 2
Screws of the top panel
Screws of the back panel
Screws of the back panel
Screws of the back panel
Screws of the cabinet
Screws of the cabinet
Photo 3
Screws of the conduit cover
Photo 4
Screw of the conduit plate
Screws of the cabinet
Screws of the back panel
Screws of the back panel
Screws of the service panel
Screw of the valve cover
OBH733F
71
OPERATING PROCEDURE
PHOTOS/FIGURES
2. Removing the inverter assembly, inverter P.C. board and relay P.C. board (1) Remove the cabinet and panels. (Refer to section 1.)
(2) Disconnect the lead wire to the reactor and the following con-
nectors:
<Inverter P.C. board> CN601 (Defrost heater) (MUZ-GL24NAH) CN602 (R.V. coil) (MUZ)
CN931, CN932 (Fan motor) CN671 (Defrost thermistor (MUZ), discharge temperature
thermistor and outdoor heat exchanger temperature
thermistor)
CN672 (Ambient temperature thermistor)
CN724 (LEV)
Photo 5
Inverter P.C. board
Screw of the relay panel
Ground wires
Screws of the P.B. support
(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 screws of the P.B. support. (8) Remove the inverter P.C. board from the P.B. support.
Screws of the P.B. support
Screw of the relay panel
Screw of the relay panel
3. Removing R.V. coil (MUZ) (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connector: <Inverter P.C. board> CN602 (R.V. coil) (MUZ) (3) Remove the R.V. coil.
Photo 6
Screw of the R.V. coil (MUZ)
Brazed parts of 4-way valve
OBH733F
72
OPERATING PROCEDURE
PHOTOS/FIGURES
4. Removing the discharge temperature thermistor, defrost thermistor (MUZ), outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to section 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 heat exchanger temperature thermistor) CN672 (Ambient temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (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.
Photo 7
Outdoor heat exchanger temperature thermistor
Ambient temperature thermistor
5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to section 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. NOTE: The propeller fan nut is a reverse thread.
Photo 8
Defrost thermistor (MUZ)
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 section 1.) (2) Remove the back panel. (Refer to section 1.) (3) Remove the inverter assembly. (Refer to section 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 6)
Photo 9
Brazed part of the discharge pipe
Discharge temperature thermistor
OBH733F
Brazed part of the suction pipe
73
HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
� Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2018. No.OBH733 REVISED EDITION-F Issued: Jul. 2017. No. OBH733 REVISED EDITION-E Issued: Mar. 2017. No. OBH733 REVISED EDITION-D Issued: Sep. 2016. No. OBH733 REVISED EDITION-C Issued: Jan. 2016. No. OBH733 REVISED EDITION-B Issued: Nov. 2015. No. OBH733 REVISED EDITION-A Published: Sep. 2015. No. OBH733 Made in Japan
Specifications are subject to change without notice.