OUTDOOR UNIT
No. OBH502
HFC
utilized
SERVICE MANUAL
R410A
Wireless type
Models
MUZ-D30NA
U1
MUZ-D30NA-
MUZ-D36NA
U1
MUZ-D36NA-
MUY-D30NA
MUY-D36NA
Indoor unit service manual
MSZ-D•NA Series (OBH501)
MSY-D•NA Series (OBH501)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
4. OUTLINES AND DIMENSIONS ························ 6
5. WIRING DIAGRAM············································ 7
6. REFRIGERANT SYSTEM DIAGRAM··············· 9
7. DATA·································································11
8. ACTUATOR CONTROL··································· 18
9. SERVICE FUNCTIONS ··································· 19
10. TROUBLESHOOTING····································· 20
11. DISASSEMBLY INSTRUCTIONS···················· 39
PARTS CATALOG (OBB502)
TM
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
1
TECHNICAL CHANGES
MUZ-D30NA
MUZ-D30NA -
MUZ-D36NA
MUZ-D36NA -
MUY-D30NA
MUY-D36NA
U1
U1
1. New model
2
PART NAMES AND FUNCTIONS
MUZ-D30NA MUZ-D36NA
MUY-D30NA MUY-D36NA
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
3
3
SPECIFICATION
Item
Model
MSZ-D30NA
MSY-D30NA
MSZ-D36NA
MSY-D36NA
32,000/33,200
33,200/34,600
30,700
(9,800 ~ 30,700)
30,700
(9,800 ~ 30,700)
Cooling
1
Btu/h
(9,800 ~ 32,000) / (9,800 ~ 33,200) /
Capacity
(9,800 ~ 33,200)
(9,800 ~ 34,600)
Rated(Minimum~Maximum)
32,600
35,200
Heating 47 1 Btu/h
Heating 17 2 Btu/h
—
—
—
—
(8,700 ~ 34,000)
(8,700 ~ 36,000)
Capacity Rated
20,800
22,800
4,140/4,360
(620 ~ 4,140) /
(620 ~ 4,360)
3,840
(520 ~ 4,100)
4,210/4,240
(620 ~ 4,210) /
(620 ~ 4,240)
3,850
3,380
Cooling
1
W
Power consumption
(620 ~ 3,850)
(620 ~ 3,380)
Rated(Minimum~Maximum)
(TOTAL)
3,360
(520 ~ 3,600)
Heating 47 1 W
Heating 17 2 W
Cooling
—
—
—
—
7.9/8.2
[15.1]
Power consumption Rated
2,620
3,000
7.7/7.6
[14.5]
1
EER
[SEER]
3
8.0 [14.5]
9.1 [16.0]
HSPF IV(V)
COP
4
Heating
Heating
(8.2)
2.84
—
—
(8.2)
2.69
—
—
1
Outdoor unit model
External finish
MUZ-D30NA
MUY-D30NA
MUZ-D36NA
MUY-D36NA
Munsell 3Y 7.8/1.1
Power supply
V , phase , Hz
208/230 , 1 , 60
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
A
A
25
21
F.L.A
Model
R.L.A
L.R.A
0.93
TNB220FMCHT
Compressor
16
20
Refrigerant control
Liner expansion valve
Cooling
Heating
dB(A)
dB(A)
55
57
55
—
—
56
57
56
—
—
Sound level
1
Defrost method
Dimensions
Reverse cycle
Reverse cycle
W
D
H
in.
in.
in.
Ib.
33-1/16
13
33-7/16
Weight
141
126
141
126
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Wireless type
12 - 24 VDC
Not supplied
3/8 (0.0315)
5/8 (0.0394)
Flared
Liquid
Gas
Indoor
Outdoor
in.
in.
Refrigerant pipe size
(Min. wall thickness)
Connection method
Flared
Height
ft.
50
Between the indoor &
outdoor units
difference
Piping length ft.
100
Refrigerant charge (R410A)
4 lb. 10 oz.
4 lb.
4 lb. 10 oz.
4 lb.
Refrigeration oil (Model)
NE022
NOTE : Test conditions are based on ARI 210/240.
1 : Rating conditions(Cooling) — Indoor : 80 ˚FDB, 67 ˚FWB, Outdoor : 95 ˚FDB, (75 ˚FWB)Rated frequency
(Heating) — Indoor : 70 ˚FDB, 60 ˚FWB, Outdoor : 47 ˚FDB, 43 ˚FWB Rated frequency
(Heating) — Indoor : 70 ˚FDB, 60 ˚FWB, Outdoor : 17 ˚FDB, 15 ˚FWBMaximum frequency
2 :
4
Test condition
3, 4
Indoor air condition
Dry bulb (°F) Wet bulb (°F)
Outdoor air condition
Dry bulb (°F) Wet bulb (°F)
Mode
ARI
Test
"A" Cooling Steady State
at rated compressor Speed
80
67
95
(75)
"B-2" Cooling Steady State
at rated compressor Speed
80
80
80
80
70
70
70
70
70
70
67
67
67
67
60
60
60
60
60
60
82
82
67
87
47
17
62
47
35
35
(65)
(65)
(53.5)
(69)
43
SEER "B-1" Cooling Steady State
(Cooling) at minimum compressor Speed
Low ambient Cooling Steady State
at minimum compressor Speed
Intermediate Cooling Steady State
at Intermediate compressor Speed
5
Standard Rating-Heating
at rated compressor Speed
Low temperature Heating
at rated compressor Speed
15
Max temperature Heating
at minimum compressor Speed
56.5
43
HSPF
(Heating)
High temperature Heating
at minimum compressor Speed
Frost Accumulation
at rated compressor Speed
33
Frost Accumulation
at Intermediate compressor Speed
33
5
5 : At Intermediate compressor Speed
=("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum compressor speed".
OPERATING RANGE
(1) POWER SUPPLY
Rated voltage
Guaranteed Voltage
208/230 V
1 phase
60 Hz
Min.187 V 208 V 230 V Max.253 V
Outdoor unit
(2) OPERATION
Intake air temperature (°F)
Mode
Condition
Standard temperature
Maximum temperature
Minimum temperature
Maximum humidity
Indoor
78 %
Outdoor
DB
80
90
67
WB
67
73
DB
95
115
14
WB
—
—
—
Cooling
57
—
Standard temperature
Heating Maximum temperature
Minimum temperature
70
80
70
60
67
60
47
75
14
43
65
13
5
4
OUTLINES AND DIMENSIONS
Unit: inch
MUZ-D30NA
MUZ-D36NA
MUY-D30NA
MUY-D36NA
Open as a rule
20 inch or more if
the front and both
sides are open
REQUIRED SPACE
4 inch or more /
8 inch or more if
there are obstacles
to both sides
Open as a rule
20 inch or more if the back,
both sides and top are open
6
5
WIRING DIAGRAM
MUZ-D30NA MUZ-D36NA
7
MUY-D30NA MUY-D36NA
8
6
REFRIGERANT SYSTEM DIAGRAM
Unit:inch
MUZ-D30NA
MUZ-D36NA
Oil
separator
Capillary tube
Strainer
#100
O.D. 0.071 x I.D. 0.024
x 39-3/8
Refrigerant pipe 5/8
(with heat insulator)
( 1.8 x 0.6 x 1,000)
4-way valve
Service
port
Stop valve
(with service port)
Outdoor
heat
Defrost
High-pressure thermistor
RT61
Flared connection
Ambient
temperature
thermistor
RT65
exchanger
Switch
Discharge
temperature
thermistor
RT62
Service
port
Compressor
Outdoor heat
exchanger
temperature
thermistor
RT68
Flared connection
LEV
Strainer
#100
Strainer
#100
R.V. coil
heating ON
cooling OFF
Receiver
Stop valve
Capillary tube
O.D. 0.142 I.D. 0.094
1-31/32
Refrigerant pipe 3/8
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
(
3.6
2.4 50)
Unit:inch
MUY-D30NA
MUY-D36NA
Oil separator
Capillary tube
Outdoor
heat
exchanger
O.D. 0.071 x I.D. 0.024
Ambient
x 39-3/8
Refrigerant pipe 5/8
(with heat insulator)
temperature
( 1.8 x 0.6 x 1,000)
thermistor
RT65
Strainer
#100
Service
Stop valve
(with service port)
port
High-pressure
Switch
Flared connection
Outdoor heat
exchanger
temperature
thermistor
RT68
Discharge
temperature
thermistor
RT62
Service
port
Compressor
Flared connection
LEV
Strainer
#100
Capillary tube
Stop valve
O.D. 0.142 x I.D. 0.094
x 1-31/32
( 3.6 x 2.4 x 50)
Refrigerant pipe 3/8
(with heat insulator)
Refrigerant flow in cooling
9
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE
Refrigerant piping : ft.
Piping size O.D : in.
Model
Max. Length
Max. Height difference
B
Gas
5/8
Liquid
3/8
A
MUZ-D30NA
MUZ-D36NA
MUY-D30NA
MUY-D36NA
100
50
Indoor
unit
Max. Height
difference
B
Max. length
A
Outdoor unit
ADDITIONAL REFRIGERANT CHARGE (R410A:oz.)
Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
Refrigerant piping length (one way) : ft.
Outdoor unit
precharged
Model
25
0
30
40
50
60
70
80
90
100
MUZ-D30NA
MUZ-D36NA
4 lb. 10 oz.
2.96
8.88
14.80
20.72
26.64
32.56
38.48
44.40
Calculation : X oz. = 2.96/5 oz. / ft. x (Refrigerant piping length (ft.) - 25)
Refrigerant piping length (one way) : ft.
Outdoor unit
precharged
Model
25
0
30
40
50
60
70
80
90
100
MUY-D30NA
MUY-D36NA
4 lb.
1.08
3.24
5.40
7.56
9.72
11.88
14.04
16.20
Calculation : X oz. = 1.08/5 oz. / ft. x (Refrigerant piping length (ft.) - 25)
NOTE : Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.
10
7 DATA
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
7-1. PERFORMANCE DATA
1) COOLING CAPACITY
Indoor air
IWB
(˚F)
71
Outdoor intake air DB temperature (˚F)
Model
75
85
95
105
115
TC
SHC TPC
TC
SHC TPC
TC
SHC TPC
TC
SHC TPC
TC
SHC TPC
37.6 19.1 3.43 35.2 17.8 3.75 33.0 16.7 4.04 30.7 15.6 4.25 28.2 14.3 4.43
35.6 22.8 3.23 33.2 21.2 3.56 30.7 19.6 3.85 28.6 18.3 4.08 26.2 16.8 4.27
33.5 25.9 3.08 31.0 24.0 3.41 28.9 22.3 3.68 26.2 20.3 3.93 23.9 18.5 4.08
40.7 19.8 3.88 38.0 18.5 4.25 35.7 17.4 4.58 33.2 16.2 4.82 30.5 14.9 5.01
38.5 23.9 3.66 35.9 22.2 4.03 33.2 20.6 4.36 30.9 19.1 4.62 28.4 17.6 4.84
36.2 27.3 3.49 33.5 25.3 3.86 31.2 23.5 4.16 28.4 21.4 4.45 25.9 19.5 4.62
37.6 19.1 3.01 35.2 17.8 3.30 33.0 16.7 3.55 30.7 15.6 3.73 28.2 14.3 3.89
35.6 22.8 2.84 33.2 21.2 3.13 30.7 19.6 3.38 28.6 18.3 3.58 26.2 16.8 3.75
33.5 25.9 2.70 31.0 24.0 2.99 28.9 22.3 3.23 26.2 20.3 3.45 23.9 18.5 3.58
40.7 19.8 3.75 38.0 18.5 4.10 35.7 17.4 4.42 33.2 16.2 4.65 30.5 14.9 4.84
38.5 23.9 3.54 35.9 22.2 3.89 33.2 20.6 4.21 30.9 19.1 4.46 28.4 17.6 4.67
36.2 27.3 3.37 33.5 25.3 3.73 31.2 23.5 4.02 28.4 21.4 4.29 25.9 19.5 4.46
42.4 20.6 3.77 39.6 19.3 4.13 37.2 18.1 4.45 34.6 16.8 4.69 31.8 15.5 4.88
40.1 24.9 3.56 37.4 23.2 3.92 34.6 21.5 4.24 32.2 20.0 4.49 29.6 18.3 4.71
37.7 28.4 3.39 34.9 26.3 3.75 32.5 24.5 4.05 29.6 22.3 4.32 27.0 20.3 4.49
MUZ-D30NA
MUZ-D36NA
MUY-D30NA
67
63
71
67
63
71
67
63
71
MUY-D36NA
(208 V)
67
63
71
MUY-D36NA
(230 V)
67
63
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.
2) COOLING CAPACITY CORRECTIONS
Refrigerant piping length (one way : ft.)
25 (std.)
1.0
40
65
100
MUZ-D30NA
MUZ-D36NA
MUY-D30NA
MUY-D36NA
0.95
0.878
0.713
3) HEATING CAPACITY
Indoor air
Outdoor intake air WB temperature (˚F)
Model
IDB
(˚F)
75
15
25
35
43
45
55
TC
TPC
TC
TPC
TC
TPC
3.28
3.19
3.11
3.74
3.65
3.55
TC
TPC
3.44
3.36
3.28
3.94
3.84
3.74
TC
TPC
3.49
3.43
3.33
3.99
3.92
3.80
TC
TPC
3.63
3.56
3.49
4.15
4.07
3.99
18.9
20.0
20.5
20.4
21.6
22.2
2.50
2.42
2.32
2.86
2.76
2.65
23.6
24.5
25.6
25.5
26.4
27.6
2.94
2.87
2.77
3.36
3.28
3.17
28.2
28.9
29.8
30.4
31.2
32.2
31.8
32.6
33.6
34.3
35.2
36.3
32.8
33.6
34.6
35.4
36.3
37.3
37.2
38.0
38.8
40.1
41.0
41.9
MUZ-D30NA
MUZ-D36NA
70
65
75
70
65
NOTE : 1. IDB : Intake air dry-bulb temperature
TC : Total Capacity (x103 Btu/h)
TPC : Total Power Consumption (kW)
2. Above data is for heating operation without any frost.
How to operate with fixed operational frequency of the compressor.
1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL
mode or EMERGENCY HEAT mode before starting to operate the air conditioner.
2. The compressor starts with operational frequency.
3. The fan speed of the indoor unit is High.
4. This operation continues for 30 minutes.
5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on
the remote controller.
11
7-2. PERFORMANCE CURVE
Cooling
MUZ-D36NA
MUY-D30NA
MUZ-D30NA
SHF at rating condition = 0.64
SHF at rating condition = 0.62
SHF at rating condition = 0.64
= 763 CFM
= 763 CFM
= 763 CFM
Airflow
Airflow
Airflow
40
38
36
34
32
30
28
26
24
43
41
39
37
35
33
31
29
27
40
38
36
34
32
30
28
26
24
Indoor intake air
Indoor intake air
Indoor intake air
WB temperature (°F)
WB temperature (°F)
WB temperature (°F)
71
67
63
71
67
63
71
67
63
)
)
4.5
4.3
4.1
3.9
3.7
3.5
3.3
3.1
5.2
4.8
4.4
4.0
3.6
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
71
67
63
71
67
63
71
67
63
ure (°F
ure (°F
mperature (°F)
Indoor intake air WB temperat
Indoor intake air WB temperat
Indoor intake air WB te
65
75
85
95
105
115
65
75
85
95
105
115
65
75
85
95
105
115
Outdoor intake air DB temperature (°F)
Outdoor intake air DB temperature (°F)
Outdoor intake air DB temperature (°F)
MUY-D36NA
SHF at rating condition = 0.62
= 763 CFM
Airflow
46
42
38
34
30
26
Ind
oor intak
e air WB temperature (°F)
71
67
63
5.0
4.6
4.2
3.8
3.4
71
67
63
rature (°F)
mpe
oor intake air WB te
Ind
65
75
85
95
105
115
Outdoor intake air DB temperature (°F)
Heating
MUZ-D36NA
MUZ-D30NA
45
= 848 CFM
Airflow
= 848 CFM
Airflow
48
43
38
33
28
23
18
65
70
75
65
70
75
40
35
30
25
20
15
4.0
3.6
3.2
2.8
2.4
4.5
4.1
3.7
3.3
2.9
75
70
65
75
70
65
15
25
35
45
55
15
25
35
45
55
Outdoor intake air WB temperature (°F)
Outdoor intake air WB temperature (°F)
This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships
between frequency and capacity.
12
7-3. CONDENSING PRESSURE
Cooling
Data is based on the condition of indoor humidity 50 %.
Air flow should be set to High speed.
MUZ-D30NA
(PSIG)
580
86
80
75
70
540
500
460
420
380
340
300
260
(PSIG)
150
140
130
120
110
100
90
86
80
75
70
68 70
75
80
85
90
95
100 105(°F)
68 70
75
80
85
90
95
100 105(°F)
Outdoor ambient temperature
Outdoor ambient temperature
MUZ-D36NA
(PSIG)
580
86
80
75
70
540
500
460
420
380
340
300
260
(PSIG)
150
140
130
120
110
100
90
86
80
75
70
68 70
75
80
85
90
95
100 105(°F)
68 70
75
80
85
90
95
100 105(°F)
Outdoor ambient temperature
Outdoor ambient temperature
MUY-D30NA
(PSIG)
580
540
500
460
420
380
340
300
260
86
80
75
70
(PSIG)
150
140
130
120
110
100
90
86
80
75
70
68 70
75
80
85
90
95
100 105(°F)
68 70
75
80
85
90
95
100 105(°F)
Outdoor ambient temperature
Outdoor ambient temperature
13
MUY-D36NA
(PSIG)
580
86
80
75
70
540
500
460
420
380
340
300
260
(PSIG)
150
140
130
120
110
100
90
86
80
75
70
68 70
75
80
85
90
95
100 105(°F)
68 70
75
80
85
90
95
100 105(°F)
Outdoor ambient temperature
Outdoor ambient temperature
Heating
Data is based on the condition of outdoor humidity 75 %.
Air flow should be set to High speed.
Data is for heating operation without any frost.
MUZ-D30NA
(PSIG)
(PSIG)
500
480
460
440
420
400
380
360
340
320
300
280
260
240
220
200
150
140
130
120
110
100
90
75
70
65
75
70
65
58Hz
80
58Hz
70
60
50
14
20 25 30 35 40 45 50 55 60 65 70(°F)
Outdoor ambient temperature
14 20 25 30 35 40 45 50 55 60 6570(°F)
Outdoor ambient temperature
MUZ-D36NA
(PSIG)
500
(PSIG)
150
75
70
65
480
460
440
420
400
380
360
340
320
300
280
260
240
220
200
140
130
120
110
100
90
75
70
65
58Hz
80
58Hz
70
60
50
14
20 25 30 35 40 45 50 55 60 65 70(°F)
Outdoor ambient temperature
14 20 25 30 35 40 45 50 55 60 6570(°F)
Outdoor ambient temperature
14
7-4. STANDARD OPERATION DATA
Model
MSZ-D30NA
MSZ-D36NA
MSY-D30NA MSY-D36NA
Item
Unit
Btu / h
—
Cooling
Heating
32,600
—
Cooling
Heating
35,200
—
Cooling
30,700
0.64
Cooling
33,200/34,000
0.62
Capacity
SHF
30,700
0.64
3.85
84
32,000/33,200
0.62
Input
kW
3.36
84
4.14/4.36
91
3.84
91
3.38
4.21/4.24
92
Rated frequency
Indoor unit
Hz
79
MSZ-D30NA
MSZ-D36NA
MSY-D30NA MSY-D36NA
V,
phase,
Hz
Power supply
Input
208/230 , 1 , 60
0.058
kW
A
Fan motor current
Outdoor unit
0.45/0.42
MUZ-D30NA
MUZ-D36NA
MUY-D30NA MUY-D36NA
V,
phase,
Hz
Power supply
208/230 , 1 , 60
Input
kW
A
3.792
3.302
4.082/4.302
3.782
3.322
4.152/4.182
18.95/17.26
Comp. current
17.25/15.56
14.95/13.46
18.65/17.86
17.25/15.56
15.05/13.56
Fan motor current
A
0.80/0.72
Condensing pressure
Suction pressure
PSIG
PSIG
˚F
468
126
404
96
480
122
420
94
453
125
475
119
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temperature
Ref. pipe length
186.8
126.5
45.5
169.7
114.3
29.8
156.4
198.7
128.5
48.0
168.8
117.0
29.1
155.7
191.3
123.8
54.7
197.1
127.4
48.6
˚F
˚F
˚F
175.6
187.0
177.4
182.7
ft.
25
Refrigerant charge (R410A)
—
4 lb. 10 oz.
4 lb.
DB
Intake air temperature
WB
˚F
80
67
70
60
80
67
70
60
80
67
80
67
˚F
DB
Discharge air temperature
WB
˚F
53.9
53
112.2
73.9
53
114.9
74.6
53.7
52.8
51.7
50.8
˚F
52.1
Fan speed (High)
rpm
CFM
˚F
1,100
Airflow (High)
741 (Wet)
795
47
738 (Wet)
794
47
718 (Wet)
710 (Wet)
DB
Intake air temperature
WB
95
—
95
—
95
—
95
—
˚F
43
43
Fan speed
rpm
CFM
800
Airflow
1,941
15
7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY
MUZ-D30NA
Correction of Cooling capacity
Correction of Cooling total input
Correction of Heating total input
Correction of Heating capacity
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
1.5
1.0
0.5
(Hz)
(Hz)
150
(Hz)
(Hz)
150
0
50
100
150
0
50
100
0
50
100
150
0
50
100
The operational frequency of compressor
The operational frequency of compressor The operational frequency of compressor
The operational frequency of compressor
MUZ-D36NA
Correction of Cooling capacity
1.5
Correction of Cooling total input
Correction of Heating capacity
Correction of Heating total input
1.5
1.0
0.5
1.5
1.5
1.0
0.5
1.0
0.5
1.0
0.5
(Hz)
(Hz)
150
(Hz)
(Hz)
150
0
50
100
150
0
50
100
0
50
100
150
0
50
100
The operational frequency of compressor
The operational frequency of compressor The operational frequency of compressor
The operational frequency of compressor
MUY-D30NA
Correction of Cooling capacity
Correction of Cooling total input
1.5
1.5
1.0
0.5
1.0
0.5
(Hz)
0
50
100
150
0
50
100
150
The operational frequency of compressor
The operational frequency of compressor
MUY-D36NA
Correction of Cooling capacity
1.5
Correction of Cooling total input
1.5
1.0
0.5
1.0
0.5
(Hz)
0
50
100
150
0
50
100
150
The operational frequency of compressor
The operational frequency of compressor
16
7-6. TEST RUN OPERATION (How to operate fixed-frequency operation)
1. Press EMERGENCY OPERATION switch to COOL or HEAT mode (COOL : Press once, HEAT : Press twice).
2. Test run operation starts and continues to operate for 30 minutes.
3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (Operation frequency of compressor
varies).
6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on
remote controller.
17
8
ACTUATOR CONTROL
MUZ-D30NA
MUZ-D36NA
MUY-D30NA
MUY-D36NA
8-1. OUTDOOR FAN MOTOR CONTROL
The fan motor turns ON/OFF, interlocking with the compressor.
[ON] The fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.
5 seconds
15 seconds
ON
Compressor
OFF
ON
Outdoor fan
motor
OFF
8-2. R.V. COIL CONTROL
<MUZ>
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
Heating
ON
OFF
OFF
Cooling
. . . . . . . . . . . . . . . . . . . .
Dry
NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.
<COOL>
<HEAT>
5 seconds
5 seconds
ON
ON or OFF
R.V.coil
ON or OFF
OFF
ON
Outdoor fan
motor
OFF
8-3. Relation between main sensor and actuator
Actuator
Sensor
Purpose
Outdoor
fan motor
Indoor
fan motor
Compressor
LEV
R.V. coil
Discharge temperature thermistor Protection
○ ○
Cooling : Coil frost prevention
Heating : High pressure protection
Defrosting
○
Indoor coil temperature thermistor
○ ○ ○
Defrost thermistor
○ ○ ○ ○ ○
Fin temperature thermistor
Protection
○
○
Outdoor heat exchanger temperature Protection
Ambient temperature thermistor Cooling : Low ambient temperature operation
○ ○ ○
○ ○ ○
18
9
SERVICE FUNCTIONS
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
9-1. PRE-HEAT CONTROL
If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and col-
lected in the compressor, it may interfere the start-up of the compressor.
To improve start-up condition, the compressor is energized even while it is not
operating.
ON
This is to generate heat at the winding.
1
2
3
4
The compressor uses about 50 W when pre-heat control is turned ON.
Pre-heat control is ON at initial setting.
[How to activate pre-heat control]
1. Turn OFF the power supply for the air conditioner before making the setting.
2. Set the 2nd Dip Switch of SW1 on the outdoor electronic control P.C. board to
ON to activate pre-heat control function.
The compressor is energized even while it is not operating.
This is to generate heat at the winding to improve the compressor's start-up condition.
ON
Power
OFF
ON
Compressor
OFF
Outside temperature
68 °F (20 °C)
30min.
30min.
30min.
30min.
30min.
30min. 15min. 30min. 15min. 30min.
ON
Pre-heat
OFF
Breaker ON
Start
Stop
When outside
temperature is
above 68 °F
(20 °C)
operation operation
1. Pre-heat control is turned ON for 15 or 30 min. after the breaker is turned ON.
2. 30 min. after the unit is stopped, pre-heat control is turned ON for 15 or 30 min. and turned OFF for 30 min.
This is repeated as shown in the graph until the breaker is turned OFF.
When outside temperature is 68 °F (20 °C) or below , pre-heat control is ON for 30 min.
When outside temperature is 70 °F (21 °C) or above, pre-heat control is ON for 15 min.
NOTE: When the unit is started with the remote controller, pre-heat control is turned OFF.
Compressor uses 50 W when pre-heat control is turned ON.
9-2. CHANGE IN DEFROST SETTING
Changing defrost finish temperature
1. Turn OFF the power supply for the air conditioner before making the setting.
2. Set the 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to
ON to change the defrost finish temperature. (Refer to 10-6-1.)
ON
1
2
3
4
4th Dip Switch of SW1
Defrost finish temperature
49.5 °F (9.7 °C)
OFF
(Initial setting)
ON
64.9 °F (18.3 °C)
19
10
TROUBLESHOOTING
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, then after con-
firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor.
4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring
Housing point
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) Before servicing check that the connector and terminal are connected properly.
3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
4) Refer to 10-2. and 10-3.
20
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.
This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.
This figures show about MSZ type.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Operational procedure
The cause of abnormality cannot be found because the abnormality doesn't recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD in operation display section of the
remote controller is displayed after 3 seconds.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature
is displayed) with the remote controller headed towards the indoor unit.
1
1. Regardless of normal or abnormal condition, a short
beep is emitted once the signal is received.
Does the left lamp of OPERATION INDICATOR lamp on the
indoor unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal. Beep is emit-
ted at the same timing as the blinking of the left lamp
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnor-
malities that can't be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor
unit failure mode recall function. (Refer to 10-2.2)
No
(OFF)
of OPERATION INDICATOR lamp.
2
Yes
(Blinks)
Judgment of indoor/outdoor abnormality
Before blinking, does the left lamp of OPERATION INDICA-
TOR lamp stay ON for 3 seconds?
Yes
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
The indoor unit is abnormal.
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table. (Refer to indoor unit service manual.)
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table. (Refer to 10-2.3)
Make sure to check at least two consecutive blinking cycles.
2
Make sure to check at least two consecutive blinking cycles.
3
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2. Blinking pattern when the indoor unit is abnormal:
Blinking at 0.5-
second interval
Blinking at 0.5-
second interval
2.5-second OFF
2.5-second OFF
ON
OFF
Beeps
Beeps
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.5-
Blinking at 0.5-
second interval
2.5-second OFF
3-second ON
second interval
2.5-second OFF
3-second ON
ON
OFF
No beep
Beeps
No beep
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
21
2. Flow chart of the detailed outdoor unit failure mode recall function
Operational procedure
The outdoor unit might be abnormal.
Confirm if outdoor unit is abnormal according to the following procedures.
Confirm that the remote controller is in the failure mode recall function.
With the remote controller headed towards the indoor unit, press TOO
COOL or TOO WARM button to adjust the set temperature to 77 ˚F (25 ˚C).
1
1. Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
Does left lamp of OPERATION INDICATOR lamp on
the indoor unit blink at the interval of 0.5 seconds?
Blinks: The outdoor unit is abnormal. Beep is emitted
No
at the same timing as the blinking of the left
(OFF)
lamp of OPERATION INDICATOR lamp.
Yes
2
)
(Blinks
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the out-
door unit failure mode table. (10-2.3.)
The outdoor unit is normal.
Make sure to check at least two consecutive blinking cycles.
2
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Release the failure mode recall function accord-
ing to the left mentioned procedure.
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" (10-2.1.).
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2.Blinking pattern when outdoor unit is abnormal:
Blinking at 0.5-
second interval
Blinking at 0.5-
second interval
2.5-second OFF
3-second ON
2.5-second OFF
3-second ON
ON
OFF
No beep
Beeps
No beep
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
22
3. Outdoor unit failure mode table
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
LED indication
(Outdoor P.C.
board)
The left lamp of OPERA-
TION INDICATOR lamp
(Indoor unit)
Indoor/outdoor
unit failure mode
recall function
Abnormal point
Condition
Correspondence
—
(Failure mode / protection)
LED 1
LED 2
OFF
Non (Normal)
—
—
—
—
•Check the connection of the
compressor connecting wire.
•Refer to 10-5. "How to check
inverter / compressor".
IPM protection stop or lock protection stop is continuously
performed 3 times within 1 minute after the compres-
2-time flash
Outdoor power system
Lighting Lighting sor gets started, or converter protection stop or bus-bar
○
voltage protection stop is continuously performed 3 times •Refer to 10-5. "Check of
within 3 minutes after start-up.
compressor start failure".
•Check the stop valve.
Discharge temperature thermistor Lighting
Once
Once
Twice
Defrost thermistor (MUZ)
Lighting
Lighting
•Refer to 10-5. "Check of
outdoor thermistors".
Ambient temperature thermistor
Fin temperature thermistor
3-time flash
Thermistor shorts or opens during compressor running.
○
Lighting 3 times
•Replace the outdoor electronic
control P.C. board.
P.C. board temperature thermistor Lighting 4 times
Outdoor heat exchanger tempera-
Lighting 9 times
•Refer to 10-5. "Check of
outdoor thermistors".
ture thermistor
•Reconnect compressor con-
nector.
•Refer to 10-5. "How to check
inverter/ compressor."
•Refer to 10-5. "Check of
compressor start failure".
•Check the stop valve.
Goes
out
4-time flash
Overcurrent
Once
28 A current flow into intelligent power module.
—
Temperature of discharge temperature thermistor exceeds •Check refrigerant circuit and
241 °F (116 °C), compressor stops. Compressor can
restart if discharge temperature thermistor reads 212 °F
(100 °C) or less 3 minutes later.
refrigerant amount.
•Refer to 10-5. "Check of
LEV".
5-time flash
Discharge temperature
High pressure
Lighting Lighting
—
—
The outdoor heat exchanger temperature exceeds 158 °F •Check refrigerant circuit and
Lighting Lighting (70 °C) during cooling or the indoor gas pipe temperature
exceeds 158 °F (70 °C) during heating (MUZ).
6-time flash
refrigerant amount.
•Check the stop valve.
Goes
out
The fin temperature exceeds 189 °F (87 °C) during opera-
•Check around outdoor unit.
•Check outdoor unit air pas-
sage.
•Refer to 10-5. "Check of
outdoor fan motor".
Fin temperature
3 times
4 times
tion.
7-time flash
—
—
Goes
out
The P.C. board temperature exceeds 158 °F (70 °C) during
operation.
P.C. board temperature
Failure occurs continuously 3 times within 30 seconds
after the fan gets started.
•Refer to 10-5. "Check of
outdoor fan motor".
8-time flash
Outdoor fan motor
Lighting Lighting
•Replace the outdoor electronic
control P.C. board.
9-time flash
Nonvolatile memory data
Lighting 5 times Nonvolatile memory data cannot be read properly.
○
•Check refrigerant circuit and
refrigerant amount.
•Refer to 10-5. "Check of
LEV".
The frequency of the compressor is kept 80 Hz or more
Lighting Lighting and the discharge temperature is kept under 102 °F (39 °C)
for more than 20 minutes.
10-time flash
Discharge temperature
—
•Check the connecting wire
between outdoor electronic
control P.C. board and power
board.
Communication error occurs between the electronic control
P.C. board and power board for more than 10 seconds.
Lighting 6 times
—
Communication error between
P.C. boards
The communication between boards protection stop is
continuously performed twice.
○
•Replace the power board.
A short or open circuit is detected in the current sensor
—
during compressor operating.
Current sensor
Lighting 7 times
11-time flash
Current sensor protection stop is continuously performed
twice.
○
•Check the connecting wire
among electronic control P.C.
board, noise filter P.C. board
and power board.
Zero cross signal cannot be detected while the compres-
sor is operating.
—
Zero cross detecting circuit
5 times Goes out
The protection stop of the zero cross detecting circuit is
continuously performed 10 times.
○
NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).
23
LED indication (Out-
door P.C. board)
The left lamp of OPERA-
TION INDICATOR lamp
(Indoor unit)
Indoor/outdoor
unit failure mode
recall function
Abnormal point
(Failure mode / protection)
Condition
Correspondence
LED 1
LED 2
•Replace the power board.
A failure is detected in the operation of the converter dur-
ing operation.
Converter
5 times Goes out
5 times Goes out
Bus-bar voltage
(1)
The bus-bar voltage exceeds 400 V or falls to 200 V or
below during compressor operating.
11-time flash
—
Bus-bar voltage
(2)
Even if this protection stop
The bus-bar voltage exceeds 400 V or falls to 50 V or
below during compressor operating.
is performed continuously 3 6 times Goes out
times, it does not mean the
abnormality in outdoor power
system.
24
10-3. TROUBLESHOOTING CHECK TABLE
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
Indication
No. Symptom
Abnormal point / Condition
Condition
Correspondence
LED1
(Red)
LED2
(Yellow)
•Check the connection of the compressor connect-
ing wire.
•Refer to 10-5. "How to check inverter/compres-
sor".
•Refer to 10-5. "Check of compressor start failure".
•Check the stop valve.
IPM protection stop or lock protection stop is continuously
performed three times within 1 minute after the compressor
gets started, or converter protection stop or bus-bar voltage
protection stop is continuously performed 3 times within 3
minutes after start-up.
1
Lightning Twice
Outdoor power system
A short circuit is detected in the thermistor during opera-
tion, or an open circuit is detected in the thermistor after 10
minutes of compressor start-up.
Discharge temperature therm-
istor
2
3
Lightning 3 times
Lightning 4 times
•Refer to 10-5. "Check of outdoor thermistor".
Fin temperature thermistor
•Refer to 10-5. "Check of outdoor thermistor".
•Replace the outdoor electronic control P.C. board.
A short or open circuit is detected in the thermistor during
operation.
P.C. board temperature therm-
istor
Ambient temperature thermis- A short or open circuit is detected in the thermistor during
tor
operation.
Outdoor
A short circuit is detected in the thermistor during operation,
or an open circuit is detected in the thermistor after 5 minutes
(in cooling) and 10 minutes (in heating (MUZ)) of compressor •Refer to 10-5. "Check of outdoor thermistor".
start-up.
unit does
not oper-
ate.
Outdoor heat exchanger
temperature thermistor
4
Lightning 5 times
A short circuit is detected in the thermistor during operation,
or an open circuit is detected in the thermistor after 5 minutes
of compressor start-up.
Defrost thermistor (MUZ)
The communication fails between the indoor and outdoor unit •Refer to 10-5. "How to check miswiring and serial
5
6
7
Lightning 6 times
Lightning 7 times
Lightning 8 times
Serial signal
for 3 minutes.
signal error.
Nonvolatile memory data
Current sensor
The nonvolatile memory data cannot be read properly.
•Replace the outdoor electronic control P.C. board.
Current sensor protection stop is continuously performed
twice.
•Replace the power board.
Communication error between The communication protection stop between boards is con-
•Check the connecting wire between outdoor elec-
tronic control P.C. board and power board.
8
9
Lightning 11 times
P.C. boards
tinuously performed twice.
•Check the connecting wire among outdoor elec-
tronic control P.C. board, noise filter P.C. board and
power board.
The protection stop of the zero cross detecting circuit is
continuously performed 10 times.
Lightning 12 times Zero cross detecting circuit
IPM protection
Overcurrent is detected after 30 minutes of compressor start- •Reconnect compressor connector.
up.
•Refer to 10-5. "How to check inverter/compres-
sor".
10
11
Twice
Goes out
•Refer to 10-5. "Check of compressor start failure".
•Check the stop valve.
•Check the power module (PAM module).
Overcurrent is detected within 30 minutes of compressor
start-up
Lock protection
Temperature of discharge temperature thermistor exceeds
Discharge temperature protec- 241 °F (116 °C), compressor stops. Compressor can restart
•Check the amount of gas and refrigerant circuit.
if discharge temperature thermistor reads 212 °F (100 °C) or •Refer to 10-5. "Check of LEV".
3 times
4 times
Goes out
Goes out
tion
less 3 minutes later.
Fin temperature protection
The fin temperature exceeds 189 °F (87 °C) during operation.
•Check refrigerant circuit and refrigerant amount.
•Refer to 10-5. "Check of LEV".
12
P.C. board temperature pro-
tection
The P.C. board temperature exceeds 158 °F (70 °C) during
operation.
The outdoor heat exchanger temperature exceeds 158 °F (70
°C) during cooling or indoor gas pipe temperature exceeds
158 °F (70 °C) during heating (MUZ).
'Outdoor
unit stops
and restarts
3 minutes
later' is
repeated.
•Check around of gas and the refrigerant circuit.
•Check of stop valve.
13
5 times
8 times
Goes out High-pressure protection
Goes out Converter protection
A failure is detected in the operation of the converter during
operation.
14
•Replace the power board.
•Replace the power board.
The bus-bar voltage exceeds 400 V or falls to 200 V or below
during compressor operating.
Bus-bar voltage protection (1)
Goes out
15
9 times
The bus-bar voltage exceeds 400 V or falls to 50 V or below
during compressor operating.
Bus-bar voltage protection (2)
Failure occurs continuously three times within 30 seconds
after the fan gets started.
16
17
13 times Goes out Outdoor fan motor
•Refer to 10-5. "Check of outdoor fan motor".
•Replace the power board.
A short or open circuit is detected in the current sensor during
compressor operating.
Lighting
Lighting
8 times
Current sensor protection
Communication error occurs between the outdoor electronic
control P.C. board and power board for more than 10 sec-
onds.
Communication between P.C.
boards protection
•Check the connecting wire between outdoor elec-
tronic control P.C. board and power board.
18
19
11 times
•Check the connecting wire among outdoor elec-
tronic control P.C. board, noise filter P.C. board and
power board.
Zero cross detecting circuit
protection
Zero cross signal cannot be detected while the compressor is
operating.
Lighting
12 times
NOTE 1. The location of LED is illustrated at the right figure. Refer to 10-6.1.
Outdoor electronic control P.C. board(Parts side)
2. LED is lighted during normal operation.
LED2 LED1
Lighting
0.5-second ON
0.5-second ON
ON
OFF
2.5-second OFF
2.5-second OFF
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
25
Indication
No. Symptom
20
Abnormal point / Condition
Primary current protection
Condition
The input current exceeds 15 A.
Correspondence
LED1
(Red)
LED2
(Yellow)
•These symptoms do not mean any abnormality of
the product, but check the following points.
•Check if indoor filters are clogged.
•Check if refrigerant is short.
•Check if indoor/outdoor unit air circulation is short
cycled.
Once
Lighting
Lighting
Secondary current protection The current of the compressor exceeds 15 A.
High-pressure protection
(MUZ)
The indoor gas pipe temperature exceeds 113 °F (45 °C) dur-
ing heating.
21
Twice
The indoor gas pipe temperature falls 37 °F (3 °C) or below
during cooling.
Defrosting in cooling
•Check refrigerant circuit and refrigerant amount.
•Refer to 10-5. "Check of LEV".
•Refer to 10-5. "Check of outdoor thermistors".
Discharge temperature protec- The discharge temperature exceeds 212 °F (100 °C) during
22
23
3 times
4 times
Lighting
Lighting
Outdoor
unit oper-
ates.
tion
operation.
The frequency of the compressor is kept 80 Hz or more and
the discharge temperature is kept under 102 °F (39 °C) for
more than 20 minutes.
Low discharge temperature
protection
•Refer to 10-5. "Check of LEV".
•Check refrigerant circuit and refrigerant amount.
•This symptom does not mean any abnormality of
the product, but check the following points.
Cooling high-pressure protec- The outdoor heat exchanger temperature exceeds 136 °F (58 •Check if indoor filters are clogged.
24
5 times
Lighting
tion
°C) during operation.
•Check if refrigerant is short.
•Check if indoor/outdoor unit air circulation is short
cycled.
25
26
9 times
Lighting
Lighting Inverter check mode
Lighting Normal
The unit is operated with emergency operation switch.
–
–
–
Outdoor
unit oper-
ates
26
10-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
Part name
Check method and criterion
Figure
Defrost thermistor
(RT61) (MUZ)
Measure the resistance with a tester.
Ambient temperature
thermistor (RT65)
Refer to 10-6. “Test point diagram and voltage”, 1. “Outdoor electron-
ic control P.C. board”, the chart of thermistor.
Outdoor heat ex-
changer temperature
thermistor (RT68)
Discharge tem-
perature 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. “Outdoor electron-
ic control P.C. board”, the chart of thermistor.
Fin temperature
thermistor (RT64)
Measure the resistance between terminals using a tester.
(Winding temperature : 14 ~ 104 °F (-10 ~ 40 °C))
W
RED
Compressor
Normal
V
WHT
U
BLK
1.24 ~ 1.53 Ω
Measure the resistance between lead wires using a tester.
(Part temperature : 14 ~ 104 °F (-10 ~ 40 °C))
RED
(W)
U
Color of lead wire
RED – BLK
BLK – WHT
WHT – RED
Normal
WHT
BLK
Outdoor fan motor
R. V. coil (MUZ)
(V)
(U)
V
13 ~ 16 Ω
W
Measure the resistance using a tester.
(Part temperature : 14 ~ 104 °F (-10 ~ 40 °C))
Normal
1.20 ~ 1.55 kΩ
Measure the resistance using a tester.
(Part temperature : 14 ~ 104 °F (-10 ~ 40 °C))
WHT
RED
ORN
LEV
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Normal
Linear expansion
valve
38 ~ 50 Ω
YLW BRN BLU
27
10-5. TROUBLESHOOTING FLOW
OPERATION / INDICATOR lamp flashes 5-times.
Outdoor unit does not operate.
A How to check inverter/ compressor
Disconnect the terminal of the compressor. 3 minutes after turn-
ing on the power supply, start EMERGENCY OPERATION.
•After the outdoor fan starts running, wait for 1 minute or more
before measuring the voltage.
•The output voltage values have the tolerance of ±20 %.
Measure the voltage between each lead wire leading
to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
No
W (RED) - U (BLK)
Is voltage output on right table?
Yes
Is output balanced?
Yes
No
No
Is the input voltage to the outdoor electronic control
P.C. board 370 V or more?
Replace the power board.
Replace the compressor.
Yes
Turn off power supply of indoor and outdoor unit, and
measure the compressor winding resistance between
the compressor terminals.
No
Is the resistance between each terminal normal?
Yes
Reconnect the lead wire of compressor, and turn on power
supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor rare short
10 to 60 seconds: compressor lock
60 seconds to 5 minutes: refrigerant circuit defective
5 minutes or more: normal
28
OPERATION INDICATOR lamp flashes 6-times.
Thermistor is abnormal.
B Check of outdoor thermistors
Disconnect the connector of thermistor in the outdoor P.C. board (see
below table), and measure the resistance of thermistor.
Replace the thermistor except RT64.
When RT64 is abnormal, replace the
outdoor power board.
Is the thermistor normal? (Refer to 10-6.1.)
No
Yes
Reconnect the connector of thermistor.
Turn ON the power supply and press EMERGENCY OPERATION switch.
Does the unit operate for 10 minutes or more
without showing thermistor abnormality?
Replace the outdoor power board.
No
Yes
OK.
(Cause is poor contact.)
Thermistor
Defrost (MUZ)
Discharge temperature
Outdoor heat exchanger temperature RT68
Ambient temperature
Fin temperature
Symbol
RT61
RT62
Connector, Pin No.
Board
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin7 and pin8
Between CN663 pin1 and pin2
Between CN3 pin1 and pin2
Outdoor electronic control P.C. board
Outdoor power board
RT65
RT64
29
The cooling operation or heating operation does not operate.
C Check of R.V. coil
MUZ-D30/36
• Heating operation does not work.
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning on the power supply, start EMERGENCY
OPERATION in HEAT mode.
Is there voltage of 208 / 230 VAC between pin1
and pin 2 at connector CN912?
1. Turn off power supply of indoor and outdoor unit, and discon-
nect the connector CN781 in the outdoor electronic control P.C.
board.
2. 3 minutes after turning ON the power supply, start EMER-
GENCY OPERATION in HEAT mode.
No
Yes
Turn OFF power supply of indoor and outdoor unit.
Disconnect the connec-
tor CN912 in noise filter
P.C. board. Is there normal
resistance to R.V. coil?
Is there voltage 12 VDC be-
Replace the electronic
tween the connector CN781
Replace the R.V. coil.
No
control P.C. board.
No
pin 5 (+) and pin 3 (-)?
Yes
Yes
Replace the noise filter P.C. board.
Replace the 4-way valve.
• Cooling operation does not work.
If the connector CN912 is not
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning on the power supply, start EMERGENCY
OPERATION in COOL mode.
connected or R.V. coil is open,
voltage occurs between terminals
even when the control is OFF.
Is there voltage of 208 / 230 VAC between pin1
and pin 2 at connector CN912?
Replace the 4-way valve.
No
1. Turn OFF power supply of indoor and outdoor unit, and
disconnect the connector CN781 in the outdoor electronic
control P.C. board.
2. 3 minutes after turning ON the power supply, start EMER-
GENCY OPERATION in COOL mode.
Is there voltage 12 VDC between the connector
CN781 pin 5 (+) and pin 3 (-)?
Replace the noise filter P.C. board.
No
Yes
Replace the outdoor electronic control P.C. board.
30
Fan motor does not operate or stops operating shortly after starting the operation.
D Check of outdoor fan motor
Check the connection between the
connector CN931 and CN932.
Is the resistance between each ter-
minal of outdoor fan motor normal?
(Refer to 10-4.)
Yes
No
Disconnect CN932 from outdoor electronic control P.C. board,
and turn on the power supply.
Rotate the outdoor fan motor manually and measure the voltage
of CN931.
Between 1(+) and 5(-)
Between 2(+) and 5(-)
Between 3(+) and 5(-)
(Fixed to either 5 or 0 VDC)
No
Does the voltage between each terminal become 5 VDC
and 0 VDC repeatedly?
Yes
Does the outdoor fan motor rotate smoothly?
Yes
No
Replace the outdoor DC fan motor.
Replace the outdoor electronic control P.C. board.
Outdoor unit does not operate.
E Check of power supply
Check the connecting of parts of main power
supply circuit.
Turn ON power supply.
Is there voltage of 208 / 230 VAC in the
power supply terminal block?
Check the power supply cable.
Replace the noise filter P.C. board.
Replace the reactor.
No
No
No
No
Yes
Is the output voltage from the noise filter P.C.
board 208 / 230 VAC?
Yes
Is the input voltage to the power board 208 /
230 VAC?
Yes
Is the input voltage to the outdoor electronic
control P.C. board 294 / 325 VDC?
Replace the power board.
Yes
Replace the outdoor electronic control P.C. board.
31
F Check of compressor start failure
Confirm that 1~4 is normal.
•Electrical circuit check
1.Contact of lead wire leading to compressor
2.Output voltage of the outdoor electronic control P.C. board and balance of them
(See 10-5. )
3.Direct current voltage to the outdoor electronic control P.C. board
4.Voltage between outdoor terminal block S1-S2
Check the refrigerant circuit.
Check the stop valve.
Does the compressor run for 10 seconds or
more after it starts?
Yes
No
No
After the compressor is heated with a drier,
Replace the compressor.
does the compressor start?
1
Yes
1
Compressor start failure. Activate pre-heat control.
(Refer to 9-1. "PRE-HEAT CONTROL")
Heat the compressor with
a drier for about 20 minutes.
Do not recover refrigerant
gas while heating.
Heating part
When cooling, heat exchanger of non-operating indoor unit frosts.
When heating, non-operating indoor unit gets warm.
G Check of LEV
Turn ON power supply to the outdoor unit after checking
LEV coil is mounted to the LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
Normal
Yes
Yes
No
Disconnect the connector CN795.
Is there normal resistance to LEV coil?
Replace the outdoor electronic
control P.C. board.
No
Replace the LEV coil.
32
• Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.
Indoor unit does not operate.
• OPERATION INDICATOR lamp flashes ON and OFF in every 0.5 seconds.
Outdoor unit doesn’t operate.
H How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the
Check the power supply.
power supply?
No
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Yes
Check the wiring.
No
Press EMERGENCY OPERATION switch once.
Does the left lamp of OPERATION INDICA-
TOR lamp light up? <Confirmation of the
power to the indoor unit>
No
No
Yes
Is there any miswiring, poor
contact, or wire disconnec-
tion of the indoor/outdoor
connecting wire?
Is serial signal error indicated 6 minutes later?
Yes
Correct them.
Yes
Is fuse (F65) broken?
No
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
B
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the opera-
tion starts.
Short-circuit outdoor terminal block S2
and S3.
1
3. Be sure to check this within 3 minutes after turning ON.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board or the outdoor electronic control P.C.
board is normal, LED blinks 6 times after 3 minutes.
Turn ON the power supply.
Outdoor electronic control P.C. board
(Parts side)
LED2 LED1
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-
Replace the inverter P.C. board or
the outdoor electronic control P.C. board.
2
No
(Lighted
or not
ON quick blinking"?
3
Lighted Blinking
2. Be careful to the residual
voltage of smoothing capacitor.
Yes
lighted)
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 VDC
between outdoor terminal block S2 and
S3? <Confirmation of serial signal>
Yes
Is there any error of the in-
Replace the indoor/
outdoor connecting
wire.
door/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
No
A
No
Yes
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Is there any error of the in-
door/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
No
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Replace the indoor/
outdoor connecting
wire.
• Reinstall
No
Yes
either the unit
or the light
each other
Yes
away.
Is serial signal
error indicated 6
minutes later?
• Attach a filter
on remote
control
No
Yes
Replace the indoor electronic control P.C. board.
receiving
Be sure to release the failure-mode recall function
after checking.
section of the
indoor unit.
B
33
The operation frequency does not go up from lowest frequency.
I Check of HPS
1. Disconnect the connector CN681 in the electronic control P.C. board.
2. Check the resistance of HPS 1 minute after the outdoor unit power supply was turned OFF.
Check the resistance between each terminal.
Replace HPS.
Infinity
0 Ω
Reconnect CN681.
Turn ON power supply to the indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Is HPS protection displayed immediately after
compressor starts?
Replace the outdoor electronic
control P.C. board.
Yes
No
Normal
34
J Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Yes
Ground the unit.
No
Is the distance between the antennas
and the indoor unit within 9.91 ft., or is
the distance between the antennas and
the outdoor unit within 9.91 ft.?
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Yes
No
Is the distance between the TV sets or
radios and the indoor unit within 3.28
ft., or is the distance between the TV
sets or radios and the outdoor unit
within 9.91 ft.?
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Yes
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the anten-
na wiring?
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Yes
No
Is the indoor/outdoor connecting wire of
the air conditioner and the wiring of the
antennas close?
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wir-
ing of the antennas.
No
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength
or the installation condition (combination of specific conditions such as antennas or wiring).
Check the followings before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of ;
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver
5. Electric field intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifier such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for
power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the elec-
tromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
35
10-6. TEST POINT DIAGRAM AND VOLTAGE
1. Outdoor electronic control P.C. board
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)
100
Fin temperature thermistor (RT64)
Discharge temperature thermistor (RT62)
200
180
160
140
120
100
80
700
600
500
400
300
200
100
0
90
80
70
60
50
40
30
20
10
0
60
40
20
0
32 50 68 86 104 122 140 158 176
32
50
68
86 104 122 140 176 194 122 212 230 248
Temperature (°F)
Temperature (°F)
-4
14
32
50
68
86 104
Temperature (°F)
LED 1
LED 2
CN801
294 ~ 370
VDC
Input
F801
FUSE
3.15 A / 250 V
CN601
(
(
208/230 VAC
60 Hz
for indoor
5~10 VDC
Input
(
CN681
High pressure switch
36
2. Noise filter P.C. board
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
CN901
To electronic
control P.C.
board
CN902
To power
board
CN903
To power
board
208 / 230 VAC
60 Hz
Input
MUZ
CN912
R.V. coil
208 / 230 VAC
60 Hz
{
Output
208 / 230 VAC
60 Hz
Output
{
CN61
F64 FUSE
2 A / 250 V
NR64 VARISTOR
37
3. Outdoor power board
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
Connect to the compressor
Voltage among phases: 180 V
Connect to the earth
294-370 VDC
CN2
Output
(Red)
Connect to the controller board
(+)1-5(–): Signal transmission
(To electronic control P.C. board)
5 VDC pulse wave
(+)
(–)
1
3
(+)2-5(–): Zero cross signal
3-4 : Not used
(White)
(+)6-5(–): 15 V
(+)7-5(–): 15 V
CN3
Fin temperature thermistor RT64
Signal reception (From electronic
control P.C. board)
)
5 VDC pulse wave
CN5
Primary current detection
(Connect to the noise filter)
38
11
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector has the
locking mechanism.
Sleeve
ꢀSlide the sleeve.
ꢀHold the sleeve, and
ꢁPull the terminal while
pushing the locking
pull out the terminal
slowly.
Locking lever
lever.
Connector
MUZ-D30NA MUZ-D36NA MUY-D30NA MUY-D36NA
OPERATING PROCEDURE
PHOTOS
1. Removing the cabinet
Photo 1
(1) Remove the screws of the service panel.
(2) Remove the screws of the top panel.
(3) Remove the screw of the valve cover.
(4) Remove the service panel.
Screw of
the top
panel
(5) Remove the top panel.
(6) Remove the valve cover.
(7) Remove the screws of the cabinet.
(8) Remove the cabinet.
(9) Remove the screws of the back panel.
(10) Remove the back panel.
Screws
of the
cabinet
Screws of the cabinet
Photo 2
Photo 3
Screw of the motor support
Screw of the service panel
Screws of the
top panel
Conduit plate
Set screws of
the back panel
Screws of
the back
panel
Screws
of the
cabinet
Screw of the
valve cover
Set screws of the back panel
39
OPERATING PROCEDURE
PHOTOS
2. Removing the inverter assembly, P.C. board and
power board
Photo 4
(1) Remove the top panel, cabinet, service panel and the back
panel. (Refer to 1.)
(2) Disconnect the following connectors;
<Electronic control P.C. board>
Screws of the reactor
CN931 and CN932 (Fan motor)
CN795 (LEV)
CN661 (Discharge temperature thermistor, defrost
thermistor (MUZ) and outdoor heat exchanger
temperature thermistor)
HPS
CN663 (Ambient temperature thermistor)
CN681 (High pressure switch) (MUZ)
<Noise filter P.C. board>
Discharge temperature
thermistor
CN912 (4-way valve) (MUZ)
<Compressor>
<Reactor>
(4) Remove the screws fixing the relay panel.
(5) Remove the inverter assembly.
(6) Disconnect all connectors and lead wires on the electronic
control P.C. board.
(7) Remove the electronic control P.C. board from the inverter
assembly.
Photo 5 (Inverter assembly)
(8) Remove the screws fixing the power board assembly.
(9) Disconnect all connectors and lead wires on the power
board.
Screws of the power board assembly
(10) Remove the power board from the inverter assembly.
(11) Disconnect all connectors and lead wires on the noise filter
P.C. board.
(12) Remove the noise filter P.C. board from the inverter
assembly.
3. Removing R.V. coil (MUZ)
(1) Remove the top panel, cabinet, service panel and the back
panel. (Refer to 1.)
(2) Disconnect the following connectors;
<Noise filter P.C. board>
Screws of the relay panel
CN912 (4-way valve)
(3) Remove the R.V. coil. (Photo 9)
Photo 6
Screws of the
relay panel
Propeller
40
OPERATING PROCEDURE
PHOTOS
4. Removing the defrost thermistor (MUZ), discharge
temperature thermistor, outdoor heat exchanger
temperature thermistor and ambient temperature
thermistor
Photo 7
Outdoor heat
exchanger
temperature
thermistor
(1) Remove the top panel, cabinet, service panel and the back
panel. (Refer to 1.)
(2) Disconnect the following connectors;
<Electronic control P.C. board>
CN661 (Discharge temperature thermistor, defrost therm-
istor (MUZ) and outdoor heat exchanger tem-
perature thermistor)
Ambient
temperature
thermistor
CN663 (Ambient temperature thermistor)
(3) Pull out the defrost thermistor from its holder. (Photo 7)
(MUZ)
(4) Pull out the discharge temperature thermistor from its hold-
er. (Photo 4)
(5) Pull out the outdoor heat exchanger temperature thermistor
from its holder. (Photo 7)
(6) Pull out the ambient temperature thermistor from its holder.
(Photo 7)
Defrost
thermistor
(for MUZ)
5. Removing outdoor fan motor
(1) Remove the top panel, cabinet, service panel and the back
panel. (Refer to 1.)
Photo 8
Screws of the outdoor fan motor
(2) Disconnect the following connectors;
<Electronic control P.C. board>
Propeller
CN931 and CN932 (Fan motor)
(3) Remove the propeller.
(4) Remove the screws fixing the outdoor fan motor.
(5) Remove the outdoor fan motor.
41
OPERATING PROCEDURE
PHOTOS
6. Removing the compressor and 4-way valve
(1) Remove the top panel, cabinet, service panel and the back
panel. (Refer to 1.)
Photo 9
(2) Remove the inverter assembly. (Refer to 2.)
(3) Remove the R.V. coil. (Refer to 3.)
(4) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure
gauge shows 0 PSIG.
(5) Detach the welded part of the suction and the discharge
pipe connected with compressor. (Photo 9)
(6) Remove the compressor nuts.
(7) Remove the compressor.
(8) Detach the welded part of 4-way valve and pipe. (Photo 8)
Welded parts of 4-way valve
R.V. coil
Photo 10
Welded part of the
discharge pipe
Welded part of the
suction pipe
7. Removing the reactor
(1) Remove the top panel, cabinet, service panel and the back
panel. (Refer to 1.)
(2) Disconnect the reactor lead wire.
(3) Remove the screws of the reactor, and remove the reactor.
42
43
TM
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Feb. 2008. No. OBH502 7
Made in Japan
New publication, effective Feb. 2008
Specifications subject to change without notice.
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