Download SERVICE MANUAL

Revision A:
• MXZ-3C24NA, MXZ-3C30NA and MXZ4C36NA have been added.
Please void OBH702.
OUTDOOR
INDOOR UNIT
UNIT
HFC
utilized
SERVICE MANUAL
No. OBH702
REVISED EDITION-A
R410A
Models
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
MXZ-5C42NA
MXZ-2C20NAHZ
MXZ-3C24NAHZ
MXZ-3C30NAHZ
Indoor unit service manual
MSZ-FE·NA Series (OBH542)
MSZ-GE·NA Series (OBH548)
MFZ-KA·NA Series (OBH568)
SEZ-KD·NA Series
PLA-A·BA Series (OCH420)
PCA-A·KA Series (OCH455)
PEAD-A·AA Series
SLZ-KA·NA Series (OCH487)
MSZ-FH·NA Series (OBH683)
MVZ-A·AA Series
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ·····························11
5. OUTLINES AND DIMENSIONS ······················ 13
6. WIRING DIAGRAM·········································· 18
7. REFRIGERANT SYSTEM DIAGRAM ············· 23
8. DATA ································································ 34
9. ACTUATOR CONTROL··································· 56
10. SERVICE FUNCTIONS···································· 57
11. TROUBLESHOOTING ····································· 59
12. DISASSEMBLY INSTRUCTIONS ···················· 77
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
INDOOR UNITS COMBINATION TABLES
PARTS CATALOG (OBB702)
TM
Revision A:
• MXZ-3C24NA, MXZ-3C30NA and MXZ-4C36NA have been added.
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.
1
TECHNICAL CHANGES
MXZ-5C42NA
MXZ-2C20NAHZ
MXZ-3C24NAHZ
MXZ-3C30NAHZ
1. New model
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
1. New model
OBH702A
2
2
PART NAMES AND FUNCTIONS
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
Air inlet
(Back and side)
Air outlet
Drain outlet
MXZ-5C42NA
MXZ-2C20NAHZ
MXZ-3C24NAHZ
MXZ-3C30NAHZ
Air inlet
(Back and side)
Air outlet
Drain outlet
OBH702A
3
3
SPECIFICATION
Item
Capacity
Power
consumption
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
*1
*1
*2
*1
*1
*2
Outdoor model
Indoor type
Btu/h
Btu/h
Btu/h
W
W
W
EER
SEER
HSPF IV(V)
COP
External finish
Power supply
V, phase, Hz
Max. fuse size (time delay)
A
Min. circuit ampacity
A
Fan motor
F.L.A
Model
Winding resistance
Ω
(at 68 ºF)
Compressor
R.L.A
L.R.A
Refrigerant control
Sound level
dB(A)
Defrost method
W
in.
Dimensions
D
in.
H
in.
Weight
lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
in.
Valve size
Gas
in.
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
lb.
Refrigeration oil (Model)
oz.
MXZ-3C24NA
Non-Duct (06+09+09 )
Duct ( 09+09+09)
22,000
23,600
25,000
24,600
19,600
19,600
1,620
2,100
1,750
1,900
2,120
2,230
13.6
11.2
20.0
16.0
9.8
9.2
4.20
3.80
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
25
22.1
1.9
SNB220FQGMC
U-V 0.95 V-W 0.95 W-U 0.95
12
13.7
LEV
51/55
Reverse cycle
37-13/32
13
31-11/32
135
Wireless type
4
Not supplied (optional parts)
1/4
A:1/2 B,C:3/8
Flared
Flared
6lb. 13oz.
24.7 (FV50S)
NOTE : Test conditions are based on ARI 210/240.
Unit: °F
Mode
Cooling
Heating
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
*1: "A" Cooling steady state at rated compressor speed
"B-2" Cooling steady state at rated compressor speed
"B-1" Cooling steady state at minimum compressor speed
Low ambient cooling steady state at minimum compressor speed
Intermediate cooling steady state at intermediate compressor speed
*1: Standard rating-heating at rated compressor speed
*2: Low temperature heating at maximum compressor speed
Maximum temperature heating at minimum compressor speed
High temperature heating at minimum compressor speed
Frost accumulation at rated compressor speed
Frost accumulation at intermediate compressor speed
OBH702A
4
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
Item
Capacity
Power
consumption
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
*1
*1
*2
*1
*1
*2
Outdoor model
Indoor type
Btu/h
Btu/h
Btu/h
W
W
W
EER
SEER
HSPF IV(V)
COP
External finish
Power supply
V, phase, Hz
Max. fuse size (time delay)
A
Min. circuit ampacity
A
Fan motor
F.L.A
Model
Winding resistance
Ω
(at 68 ºF)
Compressor
R.L.A
L.R.A
Refrigerant control
Sound level
dB(A)
Defrost method
W
in.
Dimensions
D
in.
H
in.
Weight
lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
in.
Valve size
Gas
in.
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
lb.
Refrigeration oil (Model)
oz.
MXZ-3C30NA
Non-Duct (09+09+12 )
Duct ( 09+09+12)
28,400
27,400
28,600
27,600
21,000
21,000
2,680
2,860
2,150
2,220
2,120
2,140
10.6
9.6
19.0
16.2
10.6
10.6
3.90
3.64
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
25
22.1
1.9
SNB220FQGMC
U-V 0.95 V-W 0.95 W-U 0.95
12
13.7
LEV
52/56
Reverse cycle
37-13/32
13
31-11/32
135
Wireless type
4
Not supplied (optional parts)
1/4
A:1/2 B,C:3/8
Flared
Flared
6lb. 13oz.
24.7 (FV50S)
NOTE : Test conditions are based on ARI 210/240.
Unit: °F
Mode
Cooling
Heating
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
*1: "A" Cooling steady state at rated compressor speed
"B-2" Cooling steady state at rated compressor speed
"B-1" Cooling steady state at minimum compressor speed
Low ambient cooling steady state at minimum compressor speed
Intermediate cooling steady state at intermediate compressor speed
*1: Standard rating-heating at rated compressor speed
*2: Low temperature heating at maximum compressor speed
Maximum temperature heating at minimum compressor speed
High temperature heating at minimum compressor speed
Frost accumulation at rated compressor speed
Frost accumulation at intermediate compressor speed
OBH702A
5
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
Item
Capacity
Power
consumption
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
*1
*1
*2
*1
*1
*2
Outdoor model
Indoor type
Btu/h
Btu/h
Btu/h
W
W
W
EER
SEER
HSPF IV(V)
COP
External finish
Power supply
V, phase, Hz
Max. fuse size (time delay)
A
Min. circuit ampacity
A
Fan motor
F.L.A
Model
Winding resistance
Ω
(at 68 ºF)
Compressor
R.L.A
L.R.A
Refrigerant control
Sound level
dB(A)
Defrost method
W
in.
Dimensions
D
in.
H
in.
Weight
lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
in.
Valve size
Gas
in.
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
lb.
Refrigeration oil (Model)
oz.
MXZ-4C36NA
Non-Duct (09+09+09+09 )
Duct ( 09+09+09+09)
35,400
34,400
36,000
34,400
26,600
26,600
3,760
3,940
3,020
3,100
3,340
3,450
9.4
8.7
19.2
16.0
11.0
9.8
3.50
3.25
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
25
22.1
1.9
SNB220FQGMC
U-V 0.95 V-W 0.95 W-U 0.95
12
13.7
LEV
54/56
Reverse cycle
37-13/32
13
31-11/32
137
Wireless type
4
Not supplied (optional parts)
1/4
A:1/2 B,C,D:3/8
Flared
Flared
6lb. 13oz.
24.7 (FV50S)
NOTE : Test conditions are based on ARI 210/240.
Unit: °F
Mode
Cooling
Heating
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
*1: "A" Cooling steady state at rated compressor speed
"B-2" Cooling steady state at rated compressor speed
"B-1" Cooling steady state at minimum compressor speed
Low ambient cooling steady state at minimum compressor speed
Intermediate cooling steady state at intermediate compressor speed
*1: Standard rating-heating at rated compressor speed
*2: Low temperature heating at maximum compressor speed
Maximum temperature heating at minimum compressor speed
High temperature heating at minimum compressor speed
Frost accumulation at rated compressor speed
Frost accumulation at intermediate compressor speed
OBH702A
6
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
Item
Capacity
Power
consumption
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
*1
*1
*2
*1
*1
*2
Outdoor model
Indoor type
Btu/h
Btu/h
Btu/h
W
W
W
EER
SEER
HSPF IV(V)
COP
External finish
Power supply
V, phase, Hz
Max. fuse size (time delay)
A
Min. circuit ampacity
A
Fan motor
F.L.A
Model
Winding resistance
Ω
(at 68 ºF)
Compressor
R.L.A
L.R.A
Refrigerant control
Sound level
dB(A)
Defrost method
W
in.
Dimensions
D
in.
H
in.
Weight
lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
in.
Valve size
Gas
in.
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
lb.
Refrigeration oil (Model)
oz.
MXZ-5C42NA
Non-Duct (06+09+09+09+09)
Duct (09+09+09+09+09)
40,500
37,500
45,000
41,000
24,400
23,000
4,403
4,112
3,575
3,463
2,943
2,869
9.2
9.0
19.7
15.2
10.3
9.1
3.69
3.47
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
40
31.9
1.9
MNB33FBTMC-L
U-V 0.30 V-W 0.30 W-U 0.30
20
28.8
LEV
56/58
Reverse cycle
37-13/32
13
41-17/64
189
Wireless type
4
Not supplied (optional parts)
1/4
A:1/2 B,C,D,E: 3/8
Flared
Flared
8 lb. 13 oz.
37.4 (FV50S)
NOTE : Test conditions are based on ARI 210/240.
Unit: °F
Mode
Cooling
Heating
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
*1: "A" Cooling steady state at rated compressor speed
"B-2" Cooling steady state at rated compressor speed
"B-1" Cooling steady state at minimum compressor speed
Low ambient cooling steady state at minimum compressor speed
Intermediate cooling steady state at intermediate compressor speed
*1: Standard rating-heating at rated compressor speed
*2: Low temperature heating at maximum compressor speed
Maximum temperature heating at minimum compressor speed
High temperature heating at minimum compressor speed
Frost accumulation at rated compressor speed
Frost accumulation at intermediate compressor speed
OBH702A
7
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
Item
Capacity
Power
consumption
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
*1
*1
*2
*1
*1
*2
Outdoor model
Indoor type
Btu/h
Btu/h
Btu/h
W
W
W
EER
SEER
HSPF IV(V)
COP
External finish
Power supply
V, phase, Hz
Max. fuse size (time delay)
A
Min. circuit ampacity
A
Fan motor
F.L.A
Model
Winding resistance
Ω
(at 68 ºF)
Compressor
R.L.A
L.R.A
Refrigerant control
Sound level
dB(A)
Defrost method
W
in.
Dimensions
D
in.
H
in.
Weight
lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
in.
Valve size
Gas
in.
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
lb.
Refrigeration oil (Model)
oz.
MXZ-2C20NAHZ
Non-Duct (09+09)
Duct (09+12)
18,000
20,000
22,000
22,000
13,700
13,700
1,334
1,819
1,612
1,748
1,450
1,588
13.5
11.0
17.0
15.0
9.8
9.5
4.00
3.69
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
40
28.9
1.9
MNB33FBTMC-L
U-V 0.30 V-W 0.30 W-U 0.30
20
28.8
LEV
54/58
Reverse cycle
37-13/32
13
41-17/64
187
Wireless type
4
Not supplied (optional parts)
1/4
A,B: 3/8
Flared
Flared
8 lb. 13 oz.
37.4 (FV50S)
NOTE : Test conditions are based on ARI 210/240.
Unit: °F
Mode
Cooling
Heating
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
*1: "A" Cooling steady state at rated compressor speed
"B-2" Cooling steady state at rated compressor speed
"B-1" Cooling steady state at minimum compressor speed
Low ambient cooling steady state at minimum compressor speed
Intermediate cooling steady state at intermediate compressor speed
*1: Standard rating-heating at rated compressor speed
*2: Low temperature heating at maximum compressor speed
Maximum temperature heating at minimum compressor speed
High temperature heating at minimum compressor speed
Frost accumulation at rated compressor speed
Frost accumulation at intermediate compressor speed
OBH702A
8
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
Item
Capacity
Power
consumption
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
*1
*1
*2
*1
*1
*2
Outdoor model
Indoor type
Btu/h
Btu/h
Btu/h
W
W
W
EER
SEER
HSPF IV(V)
COP
External finish
Power supply
V, phase, Hz
Max. fuse size (time delay)
A
Min. circuit ampacity
A
Fan motor
F.L.A
Model
Winding resistance
Ω
(at 68 ºF)
Compressor
R.L.A
L.R.A
Refrigerant control
Sound level
dB(A)
Defrost method
W
in.
Dimensions
D
in.
H
in.
Weight
lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
in.
Valve size
Gas
in.
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
lb.
Refrigeration oil (Model)
oz.
MXZ-3C24NAHZ
Non-Duct (06+06+09)
Duct (09+09+09)
22,000
23,600
25,000
24,600
14,000
14,000
1,630
2,360
1,725
1,871
1,622
1,635
13.5
10.0
19.0
15.5
10.0
9.0
4.25
3.80
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
40
29.9
1.9
MNB33FBTMC-L
U-V 0.30 V-W 0.30 W-U 0.30
20
28.8
LEV
54/58
Reverse cycle
37-13/32
13
41-17/64
189
Wireless type
4
Not supplied (optional parts)
1/4
A: 1/2 B,C: 3/8
Flared
Flared
8 lb. 13 oz.
37.4 (FV50S)
NOTE : Test conditions are based on ARI 210/240.
Unit: °F
Mode
Cooling
Heating
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
*1: "A" Cooling steady state at rated compressor speed
"B-2" Cooling steady state at rated compressor speed
"B-1" Cooling steady state at minimum compressor speed
Low ambient cooling steady state at minimum compressor speed
Intermediate cooling steady state at intermediate compressor speed
*1: Standard rating-heating at rated compressor speed
*2: Low temperature heating at maximum compressor speed
Maximum temperature heating at minimum compressor speed
High temperature heating at minimum compressor speed
Frost accumulation at rated compressor speed
Frost accumulation at intermediate compressor speed
OBH702A
9
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
Item
Capacity
Power
consumption
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
*1
*1
*2
*1
*1
*2
Outdoor model
Indoor type
Btu/h
Btu/h
Btu/h
W
W
W
EER
SEER
HSPF IV(V)
COP
External finish
Power supply
V, phase, Hz
Max. fuse size (time delay)
A
Min. circuit ampacity
A
Fan motor
F.L.A
Model
Winding resistance
Ω
(at 68 ºF)
Compressor
R.L.A
L.R.A
Refrigerant control
Sound level
dB(A)
Defrost method
W
in.
Dimensions
D
in.
H
in.
Weight
lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Liquid
in.
Valve size
Gas
in.
Indoor
Connection method
Outdoor
Refrigerant charge (R410A)
lb.
Refrigeration oil (Model)
oz.
MXZ-3C30NAHZ
Non-Duct (09+09+12)
Duct (09+09+12)
28,400
27,400
28,600
27,600
18,000
17,000
2,272
2,661
2,096
2,187
1,991
1,993
12.5
10.3
18.0
16.0
11.0
9.8
4.00
3.70
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
40
29.9
1.9
MNB33FBTMC-L
U-V 0.30 V-W 0.30 W-U 0.30
20
28.8
LEV
54/58
Reverse cycle
37-13/32
13
41-17/64
189
Wireless type
4
Not supplied (optional parts)
1/4
A: 1/2 B,C: 3/8
Flared
Flared
8 lb. 13 oz.
37.4 (FV50S)
NOTE : Test conditions are based on ARI 210/240.
Unit: °F
Mode
Cooling
Heating
Indoor air condition Outdoor air condition
Dry bulb Wet bulb Dry bulb Wet bulb
Test
*1: "A" Cooling steady state at rated compressor speed
"B-2" Cooling steady state at rated compressor speed
"B-1" Cooling steady state at minimum compressor speed
Low ambient cooling steady state at minimum compressor speed
Intermediate cooling steady state at intermediate compressor speed
*1: Standard rating-heating at rated compressor speed
*2: Low temperature heating at maximum compressor speed
Maximum temperature heating at minimum compressor speed
High temperature heating at minimum compressor speed
Frost accumulation at rated compressor speed
Frost accumulation at intermediate compressor speed
OBH702A
10
80
80
80
80
80
70
70
70
70
70
70
67
67
67
67
67
60
60
60
60
60
60
95
82
82
67
87
47
17
62
47
35
35
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
NOISE CRITERIA CURVES
4
MXZ-3C24NA
MXZ-3C30NA
FAN SPEED FUNCTION SPL(dB(A))
FAN SPEED FUNCTION SPL(dB(A))
LINE
High
Cooling
51
High
Cooling
52
High
Heating
55
High
Heating
56
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR
90
LINE
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
63
125
250
500
1000
2000
4000
8000
63
BAND CENTER FREQUENCIES, Hz
125
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
MXZ-4C36NA
FAN SPEED FUNCTION SPL(dB(A))
High
Cooling
54
High
Heating
56
LINE
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
39.4 in.
NC-20
MICROPHONE
10
63
OUTDOOR UNIT
125
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
Test conditions
Cooling: Dry-bulb temperature 95°F Wet-bulb temperature 75°F
Heating: Dry-bulb temperature 45°F Wet-bulb temperature 43°F
OBH702A
11
MXZ-5C42NA
MXZ-2C20NAHZ
FAN SPEED FUNCTION SPL(dB(A))
FAN SPEED FUNCTION SPL(dB(A))
LINE
High
Cooling
56
High
Cooling
54
High
Heating
58
High
Heating
58
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
63
125
250
500
1000
2000
4000
8000
63
125
BAND CENTER FREQUENCIES, Hz
500
1000
2000
4000
8000
MXZ-3C30NAHZ
FAN SPEED FUNCTION SPL(dB(A))
FAN SPEED FUNCTION SPL(dB(A))
LINE
High
Cooling
54
High
Cooling
54
High
Heating
58
High
Heating
58
LINE
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR
90
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR
250
BAND CENTER FREQUENCIES, Hz
MXZ-3C24NAHZ
20
LINE
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-20
10
63
125
250
500
1000
2000
4000
8000
63
BAND CENTER FREQUENCIES, Hz
OBH702A
125
250
500
1000
2000
BAND CENTER FREQUENCIES, Hz
12
4000
8000
5
OUTLINES AND DIMENSIONS
MXZ-3C24NA
MXZ-3C30NA
Unit: inch (mm)
Conduit plates
Conduit connector
Lock nut
OBH702A
13
Unit: inch (mm)
MXZ-4C36NA
Conduit plates
Conduit connector
Lock nut
OBH702A
14
Unit: inch (mm)
MXZ-5C42NA
Conduit plate Top
Lock nut
OBH702A
15
Conduit connector
Conduit plate Under
MXZ-2C20NAHZ
Unit: inch (mm)
Lock nut
Conduit plate
Conduit connector
OBH702A
16
MXZ-3C24NAHZ
MXZ-3C30NAHZ
Unit: inch (mm)
Lock nut
Conduit plate Top
Conduit connector
Conduit plate Under
OBH702A
17
6
WIRING DIAGRAM
MXZ-3C24NA
MXZ-3C30NA
OBH702A
18
MXZ-4C36NA
OBH702A
19
MXZ-5C42NA
L1
L2
WHT
WHT
RED
TAB5
RED
TAB3 TAB6
IC411
IC501
CIRCUIT
X52CA
TAB4
IC401
TB1 BREAKER
TAB1
BLK
L1
BLU
L2
GRN/YLW
GR
X52CB
TAB2
X65A
BLK
U
WHT
V
RED
W
PTC1
PTC2
PTC3
TB6
F1
D1
F2
OUTDOOR
POWER P.C.
BOARD
CB1
CB3
CB2
1
BLK
3
BLU
GRY
S3 12-24V
S2 ~208/230V
S1
BLU
BLK
CNAC1
CB4
V
U MS W
3~
1
7
CNF1
1
CNDC
1
3
7
CN702
BLK
BLK
CN171
2
1
1
CNAC
1
2
CN701
OUTDOOR CONTROL P.C. BOARD
T801
5
3
F711
1
LED3
3
IC801
CN611
LED2
1
5
(BLK)
CN795
CN741
(BLU)
CN793
1
5
(WHT)
CN791
1
5
1
CNTH1
8
(YLW)
CN794
CNTH2
1
2
1
5
(RED)
CN792
5
1
TB4
GRY
ORN
BLU
YLW
BLK
X713
X714
WHT
5
CN712
1
5
CN713
2 1
CN714
2 1
2
CN601
CN63H
1
2
1
S3 12-24V
S2 ~208/230V
S1
TO INDOOR
UNIT No. C
ORN
TB3
WHT
BLU
1
X712
LED1
1
TO INDOOR
UNIT No. D
RT64
CN622
MC
S3 12-24V
S2 ~208/230V
S1
BLK
t°
BLK
BLK
5
WHT
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
MF MS
3~
BRN
CNMC
RED
CNAC2
3
1
BLK
7
TBE3 TBE4
BLK
1
3
TBE1 TBE2
BLK
1
CN152
1
2
BLK
CN151
CNDC
TO INDOOR
UNIT No. E
TB5
YLW
BLU
BLK
POWER SUPPLY
208/230V
1 phase 60Hz
RED
BLK
BLU
S3 12-24V
S2 ~208/230V
S1
TO INDOOR
UNIT No. B
BLK
TB2
5
t° t°
RT61 RT62
SYMBOL
CB1~4
D1
F1, F2
F711
HPS
IC401
IC411
IC501
IC801
PTC1~3
RT61
RT62
RT64
RT65
RT68
t°
RT68
t°
RT65
NAME
SYMBOL
SMOOTHING CAPACITOR
L1, L2
DIODE
LED 1~3
FUSE (T6.3AL 250V)
LEV A~E
FUSE (T3.15AL 250V)
MC
HIGH PRESSURE SWITCH
MF
DIODE BRIDGE
T801
TB1~6
POWER MODULE
X52CA, B
POWER MODULE
X65A
POWER DEVICE
X712
CIRCUIT PROTECTION
X713
DEFROST THERMISTOR
DISCHARGE TEMP. THERMISTOR X714
21S2
FIN TEMP. THERMISTOR
AMBIENT TEMP. THERMISTOR 21S4
OUTDOOR HEAT EXCHANGER
TEMPERATURE THERMISTOR
OBH702A
5
5
5
M
M
M
M
M
LEV E
LEV D
LEV C
LEV B
LEV A
NAME
REACTOR
LED
EXPANSION VALVE
COMPRESSOR
FAN MOTOR
TRANSFORMER
TERMINAL BLOCK
RELAY
RELAY
RELAY
RELAY
RELAY
2WAY VALVE SOLENOID COIL
REVERSING VALVE SOLENOID COIL
RED
BLU
5
21S4
21S2
HPS
BLK
S3 12-24V
S2 ~208/230V
S1
NOTES:
1.About the indoor side electric wiring refer to the indoor unit
electric wiring diagram for servicing.
2.Use copper conductors only (For field wiring).
3.Symbols below indicate.
: Terminal block
: connector
NOTES:
1.À propos du câblage électrique de côté intérieur se référer à l'unité intérieure câblage
schéma électrique pour l'entretien.
2.Utiliser des conducteurs en cuivre (pour le câblage).
3.Symbole ci-dessous indique.
:bornier
:connecteur
20
TO INDOOR
UNIT No. A
MXZ-2C20NAHZ
OBH702A
21
MXZ-3C24NAHZ
MXZ-3C30NAHZ
OBH702A
22
REFRIGERANT SYSTEM DIAGRAM
7
MXZ-3C24NA
MXZ-3C30NA
R.V.coil
OFF
ON
Unit: inch (mm)
Refrigerant flow in heating
Refrigerant flow in cooling
Accumulator
Compressor
Service port
High pressure switch
Muffler
Service port
Union
Header(Gas)
ĭ1/2
Indoor unit A
Stop valve
(with service port)
Compressor shell
temperature
thermistor
RT62
4-way valve
ĭ3/8
Indoor unit B
Sub
muffler
Header (Evaporator)
Outdoor
heat exchanger
ĭ3/8
Indoor unit C
Union
ĭ1/4
Strainer
#100
ĭ1/4
Strainer
#100
Outdoor
heat exchanger temperature
thermistor
Ambient
RT68
temperature
Capillary tube
O.D.0.16 x I.D.0.11 x 3.94
(Ø4.0 x Ø2.8 x 100)
Defrost
temperature
thermistor
RT61
Strainer
Distributor #50
LEVA
Indoor unit A
Strainer
#100
LEVB
Stop valve
Indoor unit B
ĭ1/4
Strainer
#100
LEVC
Indoor unit C
OBH702A
thermistor
RT65
Capillary tube
23
Operating Range
Cooling
Heating
MXZ-3C24NA MXZ-3C30NA
Maximum
Minimum
Maximum
Minimum
Indoor intake air temperature Outdoor intake air temperature
115°FDB
95°FDB, 71°FWB
14°FDB
67°FDB, 57°FWB
75°FDB, 65°FWB
80°FDB, 67°FWB
6°FDB, 5°FWB
70°FDB, 60°FWB
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-3C24NA MXZ-3C30NA
Piping length each indoor unit (a, b, c)
82 ft. MAX.
Total piping length (a+b+c)
230 ft. MAX.
Bending point for each unit
25 MAX.
Total bending point
70 MAX.
It is irrelevant which unit is higher.
Indoor
units
a
Max. height difference
Outdoor
unit
c
49 ft.
49 ft.
49 ft.
b
Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the
tables below.
When the diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, refer to "PARTS CATALOG".
Unit : inch
Outdoor unit union diameter
For
Indoor unit A
Indoor unit B
Indoor unit C
OBH702A
24
Liquid
1/4
Gas
1/2
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
MXZ-4C36NA
R.V.coil
OFF
ON
Unit: inch (mm)
Refrigerant flow in heating
Refrigerant flow in cooling
Accumulator
Compressor
Service port
High pressure switch
Muffler
Service port
Union
Header(Gas)
Stop valve
(with service port)
ĭ1/2
Indoor unit A
Compressor shell
temperature
thermistor
RT62
4-way valve
ĭ3/8
Indoor unit B
Sub
muffler
ĭ3/8
Indoor unit C
Header (Evaporator)
Outdoor
heat exchanger
ĭ3/8
Indoor unit D
Capillary tube
O.D.0.16 x I.D.0.11 x 3.94
(Ø4.0 x Ø2.8 x 100)
Union
ĭ1/4
Strainer
#100
LEV A
ĭ1/4
Strainer
#100
LEV B
ĭ1/4
Strainer
#100
LEV C
ĭ1/4
Strainer
#100
LEV D
Indoor unit A
Capillary tube
Defrost
temperature
thermistor
RT61
Strainer
Distributor
#50
Strainer
#100
Indoor unit B
Indoor unit C
Indoor unit D
OBH702A
Outdoor
heat exchanger
temperature
Ambient
thermistor
temperature
RT68
thermistor
RT65
Stop valve
25
Operating Range
Cooling
Heating
MXZ-4C36NA
Maximum
Minimum
Maximum
Minimum
Indoor intake air temperature Outdoor intake air temperature
115°FDB
95°FDB, 71°FWB
14°FDB
67°FDB, 57°FWB
75°FDB, 65°FWB
80°FDB, 67°FWB
6°FDB, 5°FWB
70°FDB, 60°FWB
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-4C36NA
Piping length each indoor unit (a, b, c, d)
82 ft. MAX.
Total piping length (a+b+c+d)
230 ft. MAX.
Bending point for each unit
25 MAX.
Total bending point
70 MAX.
It is irrelevant which unit is higher.
Indoor
units
a
Max. height difference
b
Outdoor
unit
49 ft.
49 ft.
c
49 ft.
d
Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the
tables below.
When the diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, refer to "PARTS CATALOG".
Unit : inch
Outdoor unit union diameter
For
Indoor unit A
Indoor unit B
Indoor unit C
Indoor unit D
OBH702A
26
Liquid
1/4
Gas
1/2
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
Unit: inch (mm)
MXZ-5C42NA
R.V.coil
OFF
ON
Refrigerant flow in heating
Refrigerant flow in cooling
Accumulator
Compressor
Oil separator
Union
Service port
High pressure switch
Service port
Header(Gas)
ĭ1/2
Indoor unit A
Compressor shell
temperature
thermistor RT62
4-way valve
ĭ3/8
Indoor unit B
Stop valve
(with service port)
ĭ3/8
Indoor unit C
ĭ3/8
2-way
solenoid valve
Indoor unit D
ĭ3/8
Indoor unit E
Header(Evaporator)
Outdoor
heat exchanger
Capillary tube
O.D.0.10 x I.D.0.02 x 39.37
(Ø2.5 x Ø0.6 x 1000)
Outdoor
heat exchanger
temperature
thermistor
RT68
Capillary tube
O.D.0.16 x I.D.0.11 x 3.94
(Ø4.0 x Ø2.8 x 100)
Union
ĭ1/4 Strainer #100
LEV A
Capillary tube
Indoor unit A
ĭ1/4 Strainer #100
Strainer
#100
LEV B
Indoor unit B
Distributor
ĭ1/4 Strainer #100
LEV C
ĭ1/4 Strainer #100
LEV D
ĭ1/4 Strainer #100
LEV E
Strainer
#50
Stop valve
Indoor unit C
Indoor unit D
Indoor unit E
OBH702A
27
Defrost
temperature
thermistor
RT61
Strainer
#50
Ambient
temperature
thermistor
RT65
Operating Range
Cooling
Heating
MXZ-5C42NA
Maximum
Minimum
Maximum
Minimum
Indoor intake air temperature Outdoor intake air temperature
115°FDB
95°FDB, 71°FWB
14°FDB
67°FDB, 57°FWB
75°FDB, 65°FWB
80°FDB, 67°FWB
6°FDB, 5°FWB
70°FDB, 60°FWB
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-5C42NA
Piping length each indoor unit (a, b, c, d, e)
82 ft. MAX.
Total piping length (a+b+c+d+e)
262 ft. MAX.
Bending point for each unit
25 MAX.
Total bending point
80 MAX.
Indoor
units
a
Max. height difference
e
Outdoor
unit
49 ft.
b
49 ft.
c
49 ft.
d
Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the
tables below.
When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, refer to "PARTS CATALOG".
Unit : inch
Outdoor unit union diameter
For
Indoor unit A
Indoor unit B
Indoor unit C
Indoor unit D
Indoor unit E
OBH702A
28
Liquid
1/4
Gas
1/2
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
Unit: inch (mm)
MXZ-2C20NAHZ
R.V.coil
OFF
ON
Refrigerant flow in heating
Refrigerant flow in cooling
Accumulator
Compressor
Oil separator
Compressor shell
temperature
thermistor RT62
Service port
High pressure switch
Union
Header(Gas)
Service port
ĭ3/8
4-way valve
Indoor unit A
Stop valve
(with service port)
Header(Evaporator)
2-way
solenoid valve
ĭ3/8
Outdoor
heat exchanger
Capillary tube
O.D.0.10 x I.D.0.02 x 39.37
(Ø2.5 x Ø0.6 x 1000)
Outdoor
heat exchanger
temperature
thermistor
RT68
Indoor unit B
Union
ĭ1/4
Strainer
#100
Capillary tube
O.D.0.16 x I.D.0.11 x 3.94
(Ø4.0 x Ø2.8 x 100)
LEV A
Indoor unit A
Defrost
temperature
thermistor
RT61
Capillary tube
Strainer
#100
Distributor
Strainer
#50
Stop valve
ĭ1/4
Strainer
#100
LEV B
Indoor unit B
OBH702A
29
Strainer
#50
Ambient
temperature
thermistor
RT65
Operating Range
Cooling
Heating
MXZ-2C20NAHZ
Maximum
Minimum
Maximum
Minimum
Indoor intake air temperature Outdoor intake air temperature
95°FDB, 71°FWB
115°FDB
67°FDB, 57°FWB
14°FDB
80°FDB, 67°FWB
75°FDB, 65°FWB
70°FDB, 60°FWB
-12°FDB, -13°FWB
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-2C20NAHZ
Piping length each indoor unit (a, b)
82 ft. MAX.
Total piping length (a+b)
164 ft. MAX.
Bending point for each unit
25 MAX.
Total bending point
50 MAX.
It is irrelevant which unit is higher.
Indoor
units
a
Max. height difference
Outdoor
unit
49 ft.
49 ft.
49 ft.
b
Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the
tables below.
When the diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, refer to "PARTS CATALOG".
Unit: inch
Outdoor unit union diameter
For
Liquid
Indoor unit A
Gas
Liquid
Indoor unit B
Gas
OBH702A
30
1/4
3/8
1/4
3/8
MXZ-3C24NAHZ
MXZ-3C30NAHZ
R. V. coil
OFF
ON
Unit: inch (mm)
Refrigerant flow in heating
Refrigerant flow in cooling
Accumulator
Compressor
Service port
Compressor shell
temperature
thermistor RT62
Oil separator
High pressure switch
Union
Header(Gas)
Service port
ĭ1/2
Indoor unit A
ĭ3/8
Indoor unit B
4-way valve
Stop valve
(with service port)
Header(Evaporator)
2-way
solenoid valve
ĭ3/8
Indoor unit C
Union Strainer
ĭ1/4 #100
LEV A
Strainer
#100
Strainer
#100
LEV B
Capillary tube
Distributor
Stop valve
Strainer
#50
Indoor unit B
Strainer
ĭ1/4 #100
LEV C
Indoor unit C
OBH702A
Outdoor
heat exchanger
temperature
thermistor
RT68
Capillary tube
O.D.0.16 x I.D.0.11 x 3.94
(Ø4.0 x Ø2.8 x 100)
Indoor unit A
ĭ1/4
Outdoor
heat exchanger
Capillary tube
O.D.0.10 x I.D.0.02 x 39.37
(Ø2.5 x Ø0.6 x 1000)
31
Defrost
temperature
thermistor
RT61
Strainer
#50
Ambient
temperature
thermistor
RT65
Operating Range
Cooling
Heating
MXZ-3C24NAHZ MXZ-3C30NAHZ
Maximum
Minimum
Maximum
Minimum
Indoor intake air temperature Outdoor intake air temperature
95°FDB, 71°FWB
115°FDB
67°FDB, 57°FWB
14°FDB
80°FDB, 67°FWB
75°FDB, 65°FWB
70°FDB, 60°FWB
-12°FDB, -13°FWB
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-3C24NAHZ MXZ-3C30NAHZ
Piping length each indoor unit (a, b, c)
82 ft. MAX.
Total piping length (a+b+c)
230 ft. MAX.
Bending point for each unit
25 MAX.
Total bending point
70 MAX.
It is irrelevant which unit is higher.
Indoor
units
a
Max. height difference
Outdoor
unit
c
49 ft.
49 ft.
49 ft.
b
Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the
tables below.
When the diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, refer to "PARTS CATALOG".
Unit : inch
Outdoor unit union diameter
For
Indoor unit A
Indoor unit B
Indoor unit C
OBH702A
32
Liquid
1/4
Gas
1/2
Liquid
1/4
Gas
3/8
Liquid
1/4
Gas
3/8
PUMPING DOWN
When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere.
1) Turn off the breaker.
2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit.
3) Fully close the stop valve on the liquid pipe side of the outdoor unit.
4) Turn on the breaker.
5) Start the emergency COOL operation on all the indoor units.
6) When the pressure gauge shows 0.1 to 0 psi [Gauge] (0.05 to 0 MPa), fully close the stop valve on the gas pipe side
of the outdoor unit and stop the operation. (Refer to the indoor unit installation manual about the method for stopping
the operation.)
* If too much refrigerant has been added to the air conditioner system, the pressure may not drop to 0.1 to 0 psi [Gauge]
(0.05 to 0 MPa), or the protection function may operate due to the pressure increase in the high-pressure refrigerant circuit. If this occurs, use a refrigerant collecting device to collect all of the refrigerant in the system, and then recharge the
system with the correct amount of refrigerant after the indoor and outdoor units have been relocated.
7) Turn off the breaker. Remove the pressure gauge and the refrigerant piping.
WARNING
When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst and cause injury if any foreign substance, such as air, enters the pipes.
OBH702A
33
8
DATA
Model
Indoor type
Item
Total
Capacity
SHF
Input
Electrical
Power supply (V, phase, Hz)
circuit
Input
Comp. current (208/230V)
Fan motor current
Refrigerant Condensing pressure
circuit
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
Refrigerant charge (R410A)
Outdoor
Intake air temperature
DB
unit
WB
Fan speed
Airflow
Model
Indoor type
Item
Total
Capacity
SHF
Input
Electrical
Power supply (V, phase, Hz)
circuit
Input
Comp. current (208/230V)
Fan motor current
Refrigerant Condensing pressure
circuit
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
Refrigerant charge (R410A)
Outdoor
Intake air temperature
DB
unit
WB
Fan speed
Airflow
OBH702A
MXZ-3C24NA
kW
A
A
PSIG
PSIG
ºF
ºF
ºF
ºF
Non-Duct (06+06+09)
Duct (09+09+09)
Cooling
Heating
Cooling
Heating
22,000
25,000
23,600
24,600
–
–
–
–
1.62
1.75
2.10
1.90
208/230, 1, 60
1.554
1.684
1.920
1.780
7.47 / 6.76
8.1 / 7.32
9.23 / 8.35
8.56 / 7.74
0.3
0.3
0.3
0.3
395
310
419
345
162
101
138
102
143
137
155
141
116
98
120
106
59
36
50
34
137
128
146
131
ft
25[75]
Unit
Btu/h
–
kW
–
ºF
ºF
rpm
CFM
6lb. 13oz.
95
720
2,287
47
43
750
2,382
95
720
2,287
47
43
750
2,382
MXZ-3C30NA
kW
A
A
PSIG
PSIG
ºF
ºF
ºF
ºF
Non-Duct (09+09+12)
Duct (09+09+12)
Cooling
Heating
Cooling
Heating
28,400
28,600
27,400
27,600
–
–
–
–
2.68
2.15
2.84
2.22
208/230, 1, 60
2.614
2.084
2.650
2.090
12.57 / 11.37
10.02 / 9.06
12.74 / 11.52
10.05 / 9.09
0.3
0.3
0.3
0.3
432
323
439
323
137
97
132
99
159
136
165
136
122
101
124
101
49
32
47
32
145
121
156
128
ft
25[75]
Unit
Btu/h
–
kW
–
ºF
ºF
rpm
CFM
6 lb.13 oz.
95
720
2,287
34
47
43
750
2,382
95
720
2,287
47
43
750
2,382
Model
Indoor type
Item
Total
Capacity
SHF
Input
Electrical
Power supply (V, phase, Hz)
circuit
Input
Comp. current (208/230V)
Fan motor current
Refrigerant Condensing pressure
circuit
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
Refrigerant charge (R410A)
Outdoor
Intake air temperature
DB
unit
WB
Fan speed
Airflow
OBH702A
MXZ-4C36NA
kW
A
A
PSIG
PSIG
ºF
ºF
ºF
ºF
Non-Duct (09+09+09+09)
Duct (09+09+09+09)
Cooling
Heating
Cooling
Heating
35,400
36,000
34,400
34,400
–
–
–
–
3.76
3.02
3.94
3.10
208/230, 1, 60
3.672
2.932
3.700
2.940
17.65 / 15.97
14.1 / 12.75
17.79 / 16.09
14.13 / 12.78
0.3
0.3
0.3
0.3
461
297
470
334
141
89
129
91
172
138
176
147
127
95
129
103
51
28
46
29
162
130
165
139
ft
25[100]
Unit
Btu/h
–
kW
–
ºF
ºF
rpm
CFM
6 lb.13 oz.
95
720
2,287
35
47
43
750
2,382
95
720
2,287
47
43
750
2,382
Model
Indoor type
Item
Capacity
Total
SHF
Input
Power supply (V, phase, Hz)
Input
Electrical
circuit
Comp. current (208/230V)
Fan motor current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Refrigerant
Suction temperature
circuit
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
Refrigerant charge (R410A)
DB
Intake air temperature
WB
Outdoor
unit
Fan speed
Airflow
Model
Indoor type
Item
Capacity
SHF
Input
Power supply (V, phase, Hz)
Input
Electrical
circuit
Comp. current (208/230V)
Fan motor current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Refrigerant
Suction temperature
circuit
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
Refrigerant charge (R410A)
DB
Intake air temperature
WB
Outdoor
unit
Fan speed
Airflow
Total
OBH702A
MXZ-5C42NA
kW
A
A
PSIG
PSIG
ºF
ºF
ºF
ºF
Non-Duct (06+09+09+09+09)
Duct (09+09+09+09+09)
Cooling
Heating
Cooling
Heating
40,500
45,000
37,500
41,000
4.41
3.58
4.17
3.47
208/230, 1, 60
4.300
3.465
3.870
3.270
20.67/18.7
16.66/15.07
18.61/16.83
15.72/14.22
0.43/0.39
0.43/0.39
0.43/0.39
0.43/0.39
466
305
446
326
153
93
137
98
172
155
165
143
127
97
124
102
53
27
47
29
156
138
145
121
ft
25 [80]
Unit
Btu/h
kW
ºF
ºF
rpm
CFM
8 lb. 13 oz.
95
630
2,118
47
43
730
2,542
95
630
2,118
47
43
730
2,542
MXZ-2C20NAHZ
kW
A
A
PSIG
PSIG
ºF
ºF
ºF
ºF
Non-Duct (09+09)
Duct (09+12)
Cooling
Heating
Cooling
Heating
18,000
22,000
20,000
22,000
1.34
1.62
1.82
1.75
208/230, 1, 60
1.296
1.574
1.670
1.660
6.23/5.63
7.57/6.84
8.03/7.26
7.98/7.22
0.43/0.39
0.43/0.39
0.43/0.39
0.43/0.39
406
341
406
334
154
110
133
113
158
131
148
141
108
105
112
103
60
37
46
37
137
107
127
117
ft
25 [50]
Unit
Btu/h
kW
ºF
ºF
rpm
CFM
8 lb. 13 oz.
95
630
2,118
36
47
43
730
2,542
95
630
2,118
47
43
730
2,542
Model
Indoor type
Item
Capacity
Total
SHF
Input
Power supply (V, phase, Hz)
Input
Electrical
circuit
Comp. current (208/230V)
Fan motor current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Refrigerant
Suction temperature
circuit
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
Refrigerant charge (R410A)
DB
Intake air temperature
WB
Outdoor
unit
Fan speed
Airflow
Model
Indoor type
Item
Capacity
SHF
Input
Power supply (V, phase, Hz)
Input
Electrical
circuit
Comp. current (208/230V)
Fan motor current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Refrigerant
Suction temperature
circuit
Comp. shell bottom temp.
Ref. pipe length
[Total pipe length for multi-system]
Refrigerant charge (R410A)
DB
Intake air temperature
WB
Outdoor
unit
Fan speed
Airflow
Total
OBH702A
MXZ-3C24NAHZ
kW
A
A
PSIG
PSIG
ºF
ºF
ºF
ºF
Non-Duct (06+06+09)
Duct (09+09+09)
Cooling
Heating
Cooling
Heating
22,000
25,000
23,600
24,600
1.63
1.73
2.36
1.88
208/230, 1, 60
1.564
1.661
2.180
1.760
7.52/6.8
7.99/7.22
10.48/9.48
8.46/7.65
0.43/0.39
0.43/0.39
0.43/0.39
0.43/0.39
397
302
377
329
164
106
136
109
144
122
152
127
114
97
115
103
59
42
48
36
128
105
136
109
ft
25 [70]
Unit
Btu/h
kW
ºF
ºF
rpm
CFM
8 lb. 13 oz.
95
630
2,118
47
43
730
2,542
95
630
2,118
47
43
730
2,542
MXZ-3C30NAHZ
kW
A
A
PSIG
PSIG
ºF
ºF
ºF
ºF
Non-Duct (09+09+12)
Duct (09+09+12)
Cooling
Heating
Cooling
Heating
28,400
28,600
27,400
27,600
2.28
2.10
2.67
2.19
208/230, 1, 60
2.214
2.031
2.480
2.060
10.64/9.63
9.76/8.83
11.92/10.78
9.9/8.96
0.43/0.39
0.43/0.39
0.43/0.39
0.43/0.39
404
321
416
329
146
103
131
107
146
131
153
128
117
101
118
103
52
35
45
35
129
111
135
108
ft
25 [70]
Unit
Btu/h
kW
ºF
ºF
rpm
CFM
8 lb. 13 oz.
95
650
2,224
37
47
43
730
2,542
95
650
2,224
47
43
730
2,542
8-1. OPERATING RANGE
(1) POWER SUPPLY
Model
Outdoor unit
MXZ-3C24NA MXZ-2C20NAHZ
MXZ-3C30NA MXZ-3C24NAHZ
MXZ-4C36NA MXZ-3C30NAHZ
MXZ-5C42NA
Guaranteed Voltage
Rating
Min. 198 V 208 V 230 V Max. 253 V
208/230 V 60 Hz 1
(2) OPERATION
Function
Cooling
Heating
Intake air
temperature
Condition
"A" Cooling steady state
at rated compressor speed
"B-2" Cooling steady state
at rated compressor speed
"B-1" Cooling steady state
at minimum compressor speed
Low ambient cooling steady state
at minimum compressor speed
Intermediate cooling steady state
at intermediate compressor speed
Standard rating-heating
at rated compressor speed
Low temperature heating
at rated compressor speed
Max. temperature heating
at minimum compressor speed
High temperature heating
at minimum compressor speed
Frost accumulation
at rated compressor speed
Frost accumulation
at intermediate compressor speed
OBH702A
Outdoor
Indoor
DB (°F)
WB (°F)
DB (°F)
WB (°F)
80
67
95
(75)
80
67
82
(65)
80
67
82
(65)
80
67
67
(53.5)
80
67
87
(69)
70
60
47
43
70
60
17
15
70
60
62
56.5
70
60
47
43
70
60
35
33
70
60
35
33
38
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA
MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
The standard specifications apply only to the operation of the air conditioner under normal conditions.
Since operating conditions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
198 ~ 253 V 60 Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature :
(2) Indoor outlet air wet-bulb temperature :
(3) Outdoor intake air dry-bulb temperature :
(4) Total input:
°FWB
°FWB
°FDB
W
}
Cooling
}
(5) Indoor intake air dry-bulb temperature :
°FDB
(6) Outdoor intake air wet-bulb temperature :
°FWB
Heating
(7) Total input :
W
Indoor air wet and dry bulb temperature difference on the left side of the following chart shows the difference between the
indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at
service.
How to measure the indoor air wet and dry bulb temperature difference
1.
2.
3.
4.
5.
6.
7.
8.
Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet and dry bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air
speed is high.
Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.
Check that the air filter is cleaned.
Open windows and doors of room.
Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.
Compressor starts running at 33 Hz (COOL) or 45 Hz (HEAT). The frequency at each operation mode is fixed.
When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
10 minutes later, measure temperature again and check that the temperature does not change.
INDOOR UNIT
OUTDOOR UNIT
Wet and dry bulb
thermometers
Wet and dry bulb
thermometers
OBH702A
39
8-2. CAPACITY AND THE INPUT CURVES
15.6
7.3
10.5 12.7
12.4 15.8
14.4
6.8
9.6 11.7
11.4 14.5
13.2
6.2
8.8 10.7
10.5 13.2
12.1
5.7
8.0
9.7
9.5 12.0
10.9
5.1
7.2
8.7
8.5 10.7
9.8
4.6
6.5
7.8
7.6
9.5
8.7
09 class
(24Hz)
12 class
(31Hz)
15 class
(35Hz)
Cooling capacity (at Rated frequency)
1.5
Capacity correction factors
13.5 17.1
* 24 class
(54Hz)
11.3 13.8
18 class
(42Hz)
7.9
06 class
(19Hz)
Indoor unit class
(Inverter output
frequency)
Indoor air Wet-bulb temperature
difference (degree)
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
Indoor intake air Wet-bulb
temperature(°F)
1.4
1.3
1.2
79
1.1
75
1.0
0.9
14
23
32
41
50
59
68
77
86
95
104
72
68
64
113
Outdoor intake air Dry-bulb temperature(°F)
Total input (Cooling : at Rated frequency)
Input correction factors
1.3
1.2
79
72
68
64
75
1.1
1.0
0.9
Indoor intake air Wet-bulb
temperature( F)
0.8
14
23
32
41
50
59
68
77
86
95
Outdoor intake air Dry-bulb temperature (°F)
104
113
1.3
Capacity correction factor
39.8
36.7
33.7
30.2
27.2
24.1
21.4
18.0
15.1
11.9
1.2
)
ure
(°F
59
68
779
rat
1.1
1.0
ulb
e
mp
te
y-b
0.9
r
ir D
ea
tak
r in
0.8
o
do
In
0.7
0.6
0.5
0.4
5
* 24 class
(62Hz)
14
23
32
41
50
Outdoor intake air Wet-bulb temperature (°F)
59
Total input (Heating : at Rated frequency)
1.3
Input correction factor
15 class
(43Hz)
53.3
49.1
45.2
40.5
36.5
32.4
29.0
24.1
20.5
16.0
18 class
(50Hz)
49.1
45.4
41.6
37.4
33.7
29.9
26.5
22.1
18.7
14.8
44.8
41.4
38.0
34.0
30.6
27.2
24.1
20.2
17.1
13.5
12 class
(36Hz)
34.0
31.3
28.8
25.7
23.2
20.7
18.0
15.3
13.0
10.3
09 class
(29Hz)
06 class
(23Hz)
Indoor unit class Indoor air Dry-bulb temperature
(Inverter output
difference (degree)
frequency)
Heating capacity (at Rated frequency)
24.3
22.5
20.5
18.5
16.6
14.8
13.0
11.0
9.2
7.4
1.2
1.1
1.0
ulb
ry-b
0.9
(°F)
pe
tem
79
68
59
ta
or in
Indo
0.8
ir D
ke a
re
ratu
0.7
0.6
0.5
0.4
*
MXZ-3C30/4C36NA
5
14
23
32
41
50
Outdoor intake air Wet-bulb temperature (°F)
59
NOTE: The above broken lines are for the heating operation without any frost and defrost operation.
OBH702A
40
15.6
7.3
10.5 12.7
12.4 15.8
14.4
6.8
9.6 11.7
11.4 14.5
13.2
6.2
8.8 10.7
10.5 13.2
12.1
5.7
8.0
9.7
9.5 12.0
10.9
5.1
7.2
8.7
8.5 10.7
9.8
4.6
6.5
7.8
7.6
9.5
8.7
09 class
(20Hz)
12 class
(24Hz)
15 class
(26Hz)
Indoor intake air Wet-bulb
temperature(°F)
1.4
1.3
1.2
79
1.1
75
1.0
0.9
14
23
32
41
50
59
68
77
86
95
104
72
68
64
113
Outdoor intake air Dry-bulb temperature(°F)
*2 24
*1 18
Cooling capacity (at Rated frequency)
1.5
Capacity correction factors
13.5 17.1
class
(42Hz)
11.3 13.8
class
(32Hz)
7.9
06 class
(18Hz)
Indoor unit class
(Inverter output
frequency)
Indoor air Wet-bulb temperature
difference (degree)
MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
Total input (Cooling : at Rated frequency)
Input correction factors
1.3
1.2
79
72
68
64
75
1.1
1.0
0.9
Indoor intake air Wet-bulb
temperature( F)
0.8
14
23
32
41
50
59
68
77
86
95
Outdoor intake air Dry-bulb temperature (°F)
104
113
Capacity correction factor
1.3
1.2
)
ure
(°F
59
68
779
rat
1.1
1.0
ulb
e
mp
te
y-b
0.9
r
ir D
ea
tak
r in
0.8
o
do
In
0.7
0.6
0.5
0.4
5
class
(44Hz)
39.8
36.7
33.7
30.2
27.2
24.1
21.4
18.0
15.1
11.9
14
23
32
41
50
Outdoor intake air Wet-bulb temperature (°F)
59
Total input (Heating : at Rated frequency)
*2 24
class
(37Hz)
53.3
49.1
45.2
40.5
36.5
32.4
29.0
24.1
20.5
16.0
1.3
Input correction factor
*1 18
49.1
45.4
41.6
37.4
33.7
29.9
26.5
22.1
18.7
14.8
15 class
(33Hz)
44.8
41.4
38.0
34.0
30.6
27.2
24.1
20.2
17.1
13.5
12 class
(28Hz)
09 class
(20Hz)
34.0
31.3
28.8
25.7
23.2
20.7
18.0
15.3
13.0
10.3
06 class
(18Hz)
Indoor unit class Indoor air Dry-bulb temperature
(Inverter output
difference (degree)
frequency)
Heating capacity (at Rated frequency)
24.3
22.5
20.5
18.5
16.6
14.8
13.0
11.0
9.2
7.4
1.2
1.1
1.0
ulb
ry-b
0.9
(°F)
pe
tem
79
68
59
ta
or in
Indo
0.8
ir D
ke a
re
ratu
0.7
0.6
0.5
0.4
*1
MXZ-5C42NA,MXZ-3C24/30NAHZ
*2
MXZ-5C42NA,MXZ-3C30NAHZ
5
14
23
32
41
50
Outdoor intake air Wet-bulb temperature (°F)
59
NOTE: The above broken lines are for the heating operation without any frost and defrost operation.
OBH702A
41
8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY
(OUTDOOR UNIT: MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA)
1. 06-class unit in single operation
<COOL>Total input
<COOL>Capacity
2.0
2.0
1.5
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
2.0
<HEAT>Total input
<HEAT>Capacity
2.5
2.0
1.5
1.0
0
50
100
Frequency
150Hz
0
50
100
Frequency
150 Hz
0
0.5
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
2. 09-class unit in single operation
2.0
<HEAT>Capacity
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
2.0
2.0
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
50
100
Frequency
0
150Hz
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
3. 12-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
<HEAT>Capacity
2.0
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
2.0
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
2.0
150 Hz
0
50
100
Frequency
150 Hz
4. 15-class unit in single operation
2.0
<HEAT>Capacity
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
2.0
2.0
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
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
5. 18-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
<HEAT>Capacity
2.0
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
2.0
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
2.0
150 Hz
0
50
100
Frequency
150 Hz
6. 24-class unit in single operation (MXZ-3C30/4C36NA only)
2.0
<HEAT>Capacity
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
2.0
2.0
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
50
100
Frequency
150 Hz
OBH702A
0
50
100
Frequency
150 Hz
0
50
100
Frequency
42
150 Hz
0
50
100
Frequency
150 Hz
(OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ)
1. 06-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
<HEAT>Capacity
2.0
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
2.0
0
50
100
Frequency
150Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
2.0
150 Hz
0
50
100
Frequency
150 Hz
2. 09-class unit in single operation
2.0
<HEAT>Capacity
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
2.0
2.0
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
50
100
Frequency
150Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
3. 12-class unit in single operation
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
<HEAT>Capacity
2.0
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
2.0
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
2.0
150 Hz
0
50
100
Frequency
150 Hz
4. 15-class unit in single operation
2.0
<HEAT>Capacity
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
2.0
2.0
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
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
5. 18-class unit in single operation (MXZ-5C42NA, MXZ-3C24/30NAHZ only)
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
<HEAT>Capacity
2.0
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
2.0
0
50
100
Frequency
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
2.0
150 Hz
0
50
100
Frequency
150 Hz
6. 24-class unit in single operation (MXZ-5C42NA, MXZ-3C30NAHZ only)
2.0
<HEAT>Capacity
<COOL>Total input
<COOL>Capacity
<HEAT>Total input
2.0
2.0
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
50
100
Frequency
OBH702A
150 Hz
0
50
100
Frequency
150 Hz
0
50
100
Frequency
43
150 Hz
0
50
100
Frequency
150 Hz
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT
1. 06-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA)
(1) COOL operation
Data is based on the condition of indoor
<How to work fixed-frequency operation>
humidity 50%
1. Set emergency switch to COOL or HEAT. The switch is located
Air flow speed : High
on indoor unit.
Inverter output frequency : 24 Hz
2. Press emergency run ON/OFF button.
3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
Outdoor low pressure
150
F
re (˚
eratu
p
m
lb te
ry-bu
D
r
o
Indo
80
140
75
130
70
120
6.0
86
)
Outdoor unit current (A)
(PSIG)
160
24 Hz
5.0
4.0
3.0
re (˚F
eratu
p
m
e
t
-bulb
r Dry
o
o
d
In
)
86
80
75
70
24 Hz
2.0
1.0
110
65 70 75 80 85 90 95 100 105 110 115 (˚F)
0.0
65 70 75 80 85 90 95 100 105 110 115 (˚F)
Ambient temperature (˚F)
Ambient temperature (˚F)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 32 Hz.
Outdoor unit current (A)
7.0
6.0
5.0
4.0
)
(˚F
re
u
t
ra
pe
em
t
ulb
y-b
r
rD
oo
Ind
32 Hz
75
70
65
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F)
Ambient temperature (˚F)
OBH702A
44
2. 09-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA)
(1) COOL operation
Data is based on the condition of indoor
<How to work fixed-frequency operation>
humidity 50%
1. Set emergency switch to COOL or HEAT. The switch is located
Air flow speed : High
on indoor unit.
Inverter output frequency : 24 Hz
2. Press emergency run ON/OFF button.
3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
Outdoor low pressure
150
e (˚F
ratur
e
p
m
lb te
ry-bu
D
r
o
Indo
80
140
75
130
70
120
6.0
86
)
Outdoor unit current (A)
(PSIG)
160
24 Hz
5.0
4.0
e (˚F
ratur
e
p
tem
bulb
Dryr
o
o
Ind
)
86
80
75
70
24 Hz
3.0
2.0
1.0
0.0
65 70 75 80 85 90 95 100 105 110 115 (˚F)
110
65 70 75 80 85 90 95 100 105 110 115 (˚F)
(2) HEAT operation Ambient temperature (˚F)
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 32 Hz.
Ambient temperature (˚F)
Outdoor unit current (A)
7.0
6.0
5.0
4.0
lb
bu
ryD
r
oo
Ind
(
ure
rat
e
p
tem
˚F)
75
70
65
32 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F)
Ambient temperature (˚F)
OBH702A
45
3. 12-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA)
(1) COOL operation
Data is based on the condition of indoor
humidity 50%
Air flow speed : High
Inverter output frequency : 24 Hz
150
86
(˚F)
rature
e
p
m
e
bulb t
r DryIndoo
5.0
80
140
75
130
70
120
6.0
Outdoor unit current (A)
Outdoor low pressure
(PSIG)
160
<How to work fixed-frequency operation>
1. Set emergency switch to COOL or HEAT. The switch is located
on indoor unit.
2. Press emergency run ON/OFF button.
3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
24 Hz
b
-bul
Dry
r
o
Indo
F
re (˚
ratu
e
p
tem
)
86
80
75
70
4.0
3.0
24 Hz
2.0
1.0
110
0.0
65 70 75 80 85 90 95 100 105 110 115 (˚F) 65 70 75 80 85 90 95 100 105 110 115 (˚F)
Ambient temperature (˚F)
Ambient temperature (˚F)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 32 Hz.
Outdoor unit current (A)
7.0
6.0
5.0
oor
Ind
4.0
e(
tur
a
r
pe
tem
b
l
-bu
Dry
˚F)
75
70
65
32 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F)
Ambient temperature (˚F)
OBH702A
46
4. 15-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA)
(1) COOL operation
Data is based on the condition of indoor
humidity 50%
Air flow speed : High
Inverter output frequency : 24 Hz
<How to work fixed-frequency operation>
1. Set emergency switch to COOL or HEAT. The switch is located
on indoor unit.
2. Press emergency run ON/OFF button.
3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
160
6.0
re (˚F
eratu
p
m
e
t
-bulb
r Dry
Indoo
)
86
5.0
Outdoor unit current (A)
Outdoor low pressure
(PSIG)
170
4.0
150
80
(˚F
ture
a
r
e
temp
-bulb
y
r
D
or
Indo
75
86
80
75
70
24 Hz
3.0
140
)
2.0
130
70
1.0
24 Hz
120
0.0
65 70 75 80 85 90 95 100 105 110 115 (˚F) 65 70 75 80 85 90 95 100 105 110 115 (˚F)
Ambient temperature (˚F)
Ambient temperature (˚F)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%
Set air flow to High speed.
Inverter output frequency is 32 Hz.
Outdoor unit current (A)
7.0
6.0
5.0
oor
Ind
(
re
atu
r
e
p
em
lb t
u
b
Dry
˚F)
75
70
65
4.0
32 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F)
Ambient temperature (˚F)
OBH702A
47
5. 18-class unit in single operation (OUTDOOR UNIT : MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA)
(1) COOL operation
Data is based on the condition of indoor
humidity 50%
Air flow speed : High
Inverter output frequency : 24 Hz
<How to work fixed-frequency operation>
1. Set emergency switch to COOL or HEAT. The switch is located
on indoor unit.
2. Press emergency run ON/OFF button.
3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
160
6.0
F
ure (˚
perat
m
e
t
-bulb
r Dry
Indoo
)
86
5.0
Outdoor unit current (A)
Outdoor low pressure
(PSIG)
170
4.0
150
80
F
re (˚
ratu
e
p
tem
-bulb
y
r
D
or
Indo
75
86
80
75
70
24 Hz
3.0
140
)
2.0
130
70
1.0
24 Hz
120
0.0
65 70 75 80 85 90 95 100 105 110 115 (˚F) 65 70 75 80 85 90 95 100 105 110 115 (˚F)
Ambient temperature (˚F)
Ambient temperature (˚F)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 32 Hz.
Outdoor unit current (A)
7.0
6.0
5.0
oor
Ind
e(
tur
a
r
pe
tem
b
l
-bu
Dry
˚F)
75
70
65
4.0
32 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F)
Ambient temperature (˚F)
OBH702A
48
6. 24-class unit in single operation (OUTDOOR UNIT : MXZ-3C30NA MXZ-4C36NA)
(1) COOL operation
Data is based on the condition of indoor
<How to work fixed-frequency operation>
humidity 50%
1. Set emergency switch to COOL or HEAT. The switch is located
Air flow speed : High
on indoor unit.
Inverter output frequency : 24 Hz
2. Press emergency run ON/OFF button.
3. Compressor starts running at 24 Hz (COOL) or 32 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
(PSIG)
180
86
6.0
80
160
75
150
140
Outdoor unit current (A)
Outdoor low pressure
170
7.0
(˚F)
erature
p
m
te
lb
Dry-bu
Indoor
70
5.0
4.0
3.0
F)
˚
re (
ratu
e
p
m
lb te
y-bu
r
D
or
Indo
86
80
75
70
24 Hz
2.0
24 Hz
1.0
130
65 70 75 80 85 90 95 100 105 110 115 (˚F) 65 70 75 80 85 90 95 100 105 110 115 (˚F)
Ambient temperature (˚F)
Ambient temperature (˚F)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%
Set air flow to High speed.
Inverter output frequency is 32 Hz.
Outdoor unit current (A)
7.0
6.0
5.0
4.0
(˚F
ure
erat
p
m
e
ulb t
ry-b
D
r
o
Indo
)
75
70
65
32 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 (˚F)
Ambient temperature (˚F)
OBH702A
49
7. 06-class unit in single operation
(OUTDOOR UNIT : MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ)
(1) COOL operation
Data is based on the condition of indoor
humidity 50%
<How to work fixed-frequency operation>
1. Set emergency switch to COOL or HEAT. The switch is located
on indoor unit.
2. Press emergency run ON/OFF button.
3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
Air flow speed : High
Inverter output frequency : 18 Hz
Outdoor low pressure
160
E
U'U\
R
,QGR
80
150
75
140
70
86
80
75
70
6.0
86
WX
SHUD
HP
XOEW
)
UHÛ
Û)
H
2XWGRRUXQLWFXUUHQW$
36,*
170
130
5.0
4.0
XU
UDW
H
PS
WH
XOE
\E
'U
RU
QGR
,
18 Hz
3.0
2.0
1.0
18 Hz
120
65 70 75 80 85 90 95 100 105 110 115 Û)
0.0
65 70 75 80 85 90 95 100 105 110 115 Û)
$PELHQWWHPSHUDWXUHÛ)
$PELHQWWHPSHUDWXUHÛ)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 20 Hz.
2XWGRRUXQLWFXUUHQW$
7.0
5.0
4.0
Û)
6.0
75
70
65
'
RRU
,QG
SH
HP
OEW
X
U\E
UH
UDWX
20 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 Û)
$PELHQWWHPSHUDWXUHÛ)
OBH702A
50
8. 09-class unit in single operation
(OUTDOOR UNIT : MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ)
(1) COOL operation
Data is based on the condition of indoor
<How to work fixed-frequency operation>
humidity 50%
1. Set emergency switch to COOL or HEAT. The switch is located
Air flow speed : High
on indoor unit.
Inverter output frequency : 18 Hz
2. Press emergency run ON/OFF button.
3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
Outdoor low pressure
160
E
U'U\
R
,QGR
80
150
75
140
70
86
80
75
70
6.0
86
WX
SHUD
HP
XOEW
)
UHÛ
Û)
H
2XWGRRUXQLWFXUUHQW$
36,*
170
130
5.0
4.0
XU
UDW
H
PS
WH
XOE
\E
'U
RU
QGR
,
18 Hz
3.0
2.0
1.0
18 Hz
120
65 70 75 80 85 90 95 100 105 110 115 Û)
0.0
65 70 75 80 85 90 95 100 105 110 115 Û)
$PELHQWWHPSHUDWXUHÛ)
$PELHQWWHPSHUDWXUHÛ)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 20 Hz.
2XWGRRUXQLWFXUUHQW$
7.0
5.0
4.0
Û)
6.0
75
70
65
'
RRU
,QG
SH
HP
OEW
X
U\E
UH
UDWX
20 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 Û)
$PELHQWWHPSHUDWXUHÛ)
OBH702A
51
9. 12-class unit in single operation
(OUTDOOR UNIT : MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ)
(1) COOL operation
Data is based on the condition of indoor
<How to work fixed-frequency operation>
humidity 50%
1. Set emergency switch to COOL or HEAT. The switch is located
Air flow speed : High
on indoor unit.
Inverter output frequency : 18 Hz
2. Press emergency run ON/OFF button.
3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
Outdoor low pressure
160
E
U'U\
R
,QGR
80
150
75
140
70
86
80
75
70
6.0
86
WX
SHUD
HP
XOEW
)
UHÛ
Û)
H
2XWGRRUXQLWFXUUHQW$
36,*
170
130
5.0
4.0
XU
UDW
H
PS
WH
XOE
\E
'U
RU
QGR
,
18 Hz
3.0
2.0
1.0
18 Hz
120
65 70 75 80 85 90 95 100 105 110 115 Û)
0.0
65 70 75 80 85 90 95 100 105 110 115 Û)
$PELHQWWHPSHUDWXUHÛ)
$PELHQWWHPSHUDWXUHÛ)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 20 Hz.
2XWGRRUXQLWFXUUHQW$
7.0
5.0
4.0
Û)
6.0
75
70
65
'
RRU
,QG
SH
HP
OEW
X
U\E
UH
UDWX
20 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 Û)
$PELHQWWHPSHUDWXUHÛ)
OBH702A
52
10. 15-class unit in single operation
(OUTDOOR UNIT : MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ)
(1) COOL operation
Data is based on the condition of indoor
<How to work fixed-frequency operation>
humidity 50%
1. Set emergency switch to COOL or HEAT. The switch is located
Air flow speed : High
on indoor unit.
Inverter output frequency : 18 Hz
2. Press emergency run ON/OFF button.
3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
36,*
180
,
80
160
150
75
140
70
86
80
75
70
Û)
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Outdoor low pressure
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18 Hz
3.0
2.0
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130
18 Hz
120
65 70 75 80 85 90 95 100 105 110 115 Û)
0.0
65 70 75 80 85 90 95 100 105 110 115 Û)
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(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 20 Hz.
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5.0
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15 20 25 30 35 40 45 50 55 60 65 70 75 Û)
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OBH702A
53
11. 18-class unit in single operation
(OUTDOOR UNIT : MXZ-5C42NA MXZ-3C24NAHZ MXZ-3C30NAHZ)
(1) COOL operation
Data is based on the condition of indoor
<How to work fixed-frequency operation>
humidity 50%
1. Set emergency switch to COOL or HEAT. The switch is located
Air flow speed : High
on indoor unit.
Inverter output frequency : 18 Hz
2. Press emergency run ON/OFF button.
3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
36,*
180
,
80
160
150
75
140
70
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5.0
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,
18 Hz
3.0
2.0
1.0
130
18 Hz
120
65 70 75 80 85 90 95 100 105 110 115 Û)
0.0
65 70 75 80 85 90 95 100 105 110 115 Û)
$PELHQWWHPSHUDWXUHÛ)
$PELHQWWHPSHUDWXUHÛ)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 20 Hz.
2XWGRRUXQLWFXUUHQW$
7.0
5.0
4.0
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6.0
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75
70
65
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20 Hz
3.0
2.0
15 20 25 30 35 40 45 50 55 60 65 70 75 Û)
$PELHQWWHPSHUDWXUHÛ)
OBH702A
54
12. 24-class unit in single operation
(OUTDOOR UNIT : MXZ-5C42NA MXZ-3C30NAHZ)
(1) COOL operation
Data is based on the condition of indoor
humidity 50%
<How to work fixed-frequency operation>
1. Set emergency switch to COOL or HEAT. The switch is located
on indoor unit.
2. Press emergency run ON/OFF button.
3. Compressor starts running at 18 Hz (COOL) or 20 Hz (HEAT).
4. Indoor fan runs at High speed and continues for 30 minutes.
5. To cancel this operation, press emergency run ON/OFF button
or any button on remote controller.
Air flow speed : High
Inverter output frequency : 18 Hz
190
Outdoor low pressure
6.0
HÛ)
WXU
SHUD
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U'U\
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,QGR
180
80
170
75
160
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150
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3.0
2.0
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130
65 70 75 80 85 90 95 100 105 110 115 Û)
0.0
65 70 75 80 85 90 95 100 105 110 115 Û)
$PELHQWWHPSHUDWXUHÛ)
$PELHQWWHPSHUDWXUHÛ)
(2) HEAT operation
Data is based on the condition of outdoor
humidity 75%.
Set air flow to High speed.
Inverter output frequency is 20 Hz.
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OBH702A
55
9
ACTUATOR CONTROL
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
MXZ-5C42NA
MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
Relation between main sensor and actuator
Actuator
2-way solenoid
valve
Sensor
Discharge temperature
thermistor
Indoor coil temperature
thermistor
Defrost thermistor
Fin temperature
thermistor
Ambient temperature
thermistor
Outdoor heat exchanger
temperature thermistor
Capacity code
OBH702A
Purpose
Protection
Cooling: Coil frost
prevention
Heating: High pressure protection
Heating: Defrosting
Protection
Control/Protection
Compressor
LEV
○
○
○
○
○
○
○
○
○
○
Outdoor
fan motor
4-way valve (MXZ-5C42VA
(MXZ-2C20NAHZ
MXZ-2C20NAHZ
MXZ-3C24NAHZ
MXZ-3C24NAHZ
MXZ-3C30NAHZ)
MXZ-3C30NAHZ)
○
○
○
○
○
○
○
○
Heating: Defrosting
(Heater)
Cooling: Control/
Protection
Control
Defrost
heater
○
○
○
○
56
○
○
10
SERVICE FUNCTIONS
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
MXZ-5C42NA
MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
10-1. PRE-HEAT CONTROL
If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected 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.
This is to generate heat at the winding.
The compressor uses about 50 W when pre-heat control is turned ON.
Pre-heat control is ON at initial setting.
[How to deactivate pre-heat control]
Turn OFF the power supply for the air conditioner before making the setting.
Set the "4" of SW2 on the outdoor control P.C. board to ON to deactivate pre-heat control function.
Outdoor control P.C. board
LED
SW871
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
OBH702A
57
10-2. AUTO LINE CORRECTING
Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping.
Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871).
When improper wiring or piping is detected, wiring lines are corrected.
This will be completed in about 10 to 20 minutes.
[How to activate this function]
&KHFNWKDWRXWVLGHWHPSHUDWXUHLVDERYHÛ)
7KLVIXQFWLRQGRHVQRWZRUNZKHQRXWVLGHWHPSHUDWXUHLVQRWDERYHÛ)
2. Check that the stop valves of the liquid pipe and gas pipe are open.
3. Check that the wiring between indoor and outdoor unit is correct.
(If the wiring is not correct, this function does not work.)
4. Turn ON the power supply and wait at least 1 minute.
5. Press the piping/wiring correction switch (SW871) on the outdoor control P.C. board.
Do not touch energized parts.
LED indication during detection:
LED1 (Red) LED2 (Yellow) LED3 (Green)
Lighted
Once
Lighted
LED indication after detection:
Indication
LED1 (Red) LED2 (Yellow) LED3 (Green)
Not lighted
Lighted
Completed (Problem corrected/ nomal)
Lighted
Once
Once
Not completed (Detection failed)
Once
5HIHUWR6$)(7<35(&$87,216:+(1/(')/$6+(6
Other indications
located behind the service panel.
Make sure that the valves are open and the pipes are not collapsed or clogged.
6. Press the switch to cancel.
LED indication after cancel :
LED1 (Red) LED2 (Yellow) LED3 (Green)
Lighted
Not lighted
Lighted
NOTE : Indoor unit cannot be operated while this function is activated.
When this function is activated while indoor unit is operating, the operation will be stopped.
Operate indoor unit after the auto line correcting is finished.
Pressing the switch during detection cancels this function.
The record of auto line correcting can be confirmed in the following way:
Press the switch for more than 5 seconds.
LED will show the record of auto correcting for about 30 seconds as shown in the table below:
LED1 (Red)
Once
3 times
Number of blinks
Wiring line
LED2 (Yellow) LED3 (Green)
Once
Lighted
Not corrected
3 times
Lighted
Corrected
NOTE : Activate this function to confirm the correct wiring after replacing the outdoor control P.C. board.
(Previous records are deleted when the outdoor control P.C. board is replaced.)
The record cannot be shown if auto line correcting is not canceled (Refer to "How to activate this function").
OBH702A
58
11
TROUBLESHOOTING
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
MXZ-5C42NA
MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
11-1. 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 unit first with the remote controller, and 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 outdoor
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 flashing on and off to indicate an abnormality. To
make sure, check how many times the OPERATIONAL INDICATOR lamp is flashing on and off before starting service
work.
2) When the outdoor control P.C. board seems to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
3) When troubleshooting, refer to 11-2, 11-3 and 11-4.
11-2. FAILURE MODE RECALL FUNCTION
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (11-4) disappears, the memorized failure details
can be recalled.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Refer to the service manual of indoor unit.
OBH702A
59
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.
3
1 Regardless of normal or abnormal condition, 2 short
beeps are emitted as the signal is received.
3 Refer to the service manual of indoor unit.
With the remote controller headed towards the indoor unit, press the TEM1
PERATURE buttons to adjust the set temperature to 77°F (25°C).
Does 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
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 mode table (11-2.3.).
Make sure to check at least two consecutive blinking cycles. 2
The outdoor unit is normal.
Release the failure mode recall function.
Release the failure mode recall function.
3
3
Repair the failure parts.
Delete the memorized abnormal condition.
Release the failure mode recall function.
3
3
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:
2.5-second OFF
3-second ON
Blinking at 0.5second interval
2.5-second OFF
3-second ON
Blinking at 0.5second interval
ON
OFF
No beep
Repeated cycle
OBH702A
No beep
Repeated cycle
Beeps
60
Beeps
Repeated cycle
3. Outdoor unit failure mode table
The left lamp of
OPERATION INDICATOR lamp
(Indoor unit)
OFF
2-time flash
3-time flash
4-time flash
5-time flash
6-time flash
7-time flash
LED indication
(Outdoor P.C.
Condition
board)
LED 1 LED 2
None (Normal)
Lighted Lighted
Outdoor power system
Lighted Lighted Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started, or converter protection
cut-out or bus-bar voltage protection cut-out
operates 3 consecutive times within 3 minutes
after start-up.
Discharge temperature thermistor
Lighted Once A thermistor shorts or opens during
Defrost thermistor
Lighted Once compressor running.
Ambient temperature thermistor
Lighted Twice
Fin temperature thermistor
Lighted 3 times
P.C. board temperature thermis- Lighted 4 times
tor
Outdoor heat exchanger tem- Lighted 9 times
perature thermistor
21 A (MXZ-3C24/3C30/4C36NA)/28 A (MXZOvercurrent
Once
Not
lighted 5C42NA,2C20/3C24/3C30NAHZ) current
flows into power module.
Abnormal point
(Failure mode/protection)
Discharge temperature
High pressure
Fin temperature
P.C. board temperature
8-time flash
Outdoor fan motor
9-time flash
Outdoor control system
10-time flash
Low discharge temperature
protection
11-time flash
Communication error
between P.C. boards
Current sensor
Zero cross detecting circuit
Converter
Bus-bar voltage
15-time flash
LEV and drain pump
Remedy
• Check the connection of the compressor connecting wire.
• Refer to 11-6.
"How to check inverter/compressor".
• Check the stop valve.
• Refer to 11-6. "Check of outdoor
thermistors".
• Replace the outdoor control P.C.
board.
• Refer to 11-6. "Check of outdoor
thermistors".
• Reconnect compressor connector.
"How to check in• Refer to 11-6.
verter/compressor".
• Check the stop valve.
Lighted Lighted The discharge temperature exceeds 240.8 °F • Check refrigerant circuit and refrigduring operation.
erant amount.
Compressor can restart if discharge tempera- • Refer to 11-6. "Check of LEV".
ture thermistor reads 212 °F or less 3 minutes
later.
Lighted Lighted The outdoor heat exchanger temperature ex- • Check refrigerant circuit and refrigceeds 158°F during cooling or the indoor gas erant amount.
pipe temperature exceeds 158 °F during heating. • Check the stop valve.
The fin temperature exceeds 192 °F during
3 times
Not
• Check around outdoor unit.
lighted operation.
• Check outdoor unit air passage.
The P.C. board temperature exceeds 189 °F • Refer to 11-6. "Check of outdoor
4 times
Not
fan motor".
lighted during operation.
Lighted Lighted A failure occurs 3 consecutive times within 30
seconds after the fan gets started.
Lighted 5 times Nonvolatile memory data cannot be read properly.
Lighted Lighted The frequency of the compressor is kept 80 Hz
or more and the discharge temperature is kept
under 102.2 °F for more than 20 minutes.
Lighted 6 times Communication error occurs between the outdoor control P.C. board and outdoor power P.C.
board for more than 10 seconds.
The communication between boards protection cut-out operates 2 consecutive times.
Lighted 7 times A short or open circuit is detected in the current sensor during compressor operating.
Current sensor protection cut-out operates 2
consecutive times.
5 times
Not
Zero cross signal cannot be detected while the
lighted compressor is operating.
The protection cut-out of the zero cross
detecting circuit operates 10 consecutive
times.
5 times
Not
A failure is detected in the operation of the
lighted converter during operation.
• Refer to 11-6. "Check of outdoor
fan motor".
• Replace the outdoor control P.C. board.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6. "Check of LEV".
• Check the connecting wire between
outdoor control P.C. board and outdoor power P.C. board.
• Check the connecting wire among
outdoor control P.C. board and outdoor power P.C. board.
• Check the voltage of power supply.
• Replace the outdoor power P.C.
board.
6 times
Not
The bus-bar voltage exceeds 400 V or falls to • Check the voltage of power supply.
lighted low level during compressor operating.
• Replace the outdoor control P.C.
board.
Lighted Lighted The indoor unit detects an abnormality in • Refer to 11-6. "Check of LEV".
• Check the drain pump of the indoor
the LEV and drain pump.
unit.
61
○
○
—
—
—
—
—
○
—
—
○
—
—
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.).
OBH702A
Indoor/
outdoor unit
failure mode
recall function
○
—
○
—
—
11-3. INSTRUCTION OF TROUBLESHOOTING
• Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor
unit.
Then, check the outdoor unit with referring to this page.
Operation start
Check the outdoor unit
LED indicator.
LED 1 or LED 2
has blinked.
Both LED 1 and
Both LED1 and LED 2 are lighting.
LED2 are OFF.
Refer to 11-4.
"Troubleshooting check table".
Refer to 11-6.
"Check of power supply".
‡,QGRRUXQLW
serial signal
error
Refer to 11-6.
"How to
check
miswiring and
serial signal
error".
‡&22/RU
HEAT
operation only
Refer to 11-6.
"Check of
R.V. coil".
OBH702A
‡:KHQFRROLQJKHDW
exchanger of
non-operating indoor
unit frosts.
‡:KHQKHDWLQJQRQ
operating indoor unit
gets warm.
Refer to 11-6.
"Check of LEV".
‡:KHQFRROLQJ
dew drops in the
non-operating
indoor unit.
Check of
miss-piping.
62
‡:KHQKHDWLQJ
room does not get
warm.
Refer to 11-6.
"How to check
inverter/compressor".
&KHFNPLVSLSLQJ
shortage of capacity.
‡:KHQFRROLQJ
room is not
cool.
Refer to 11-6.
"How to check
inverter/
compressor".
11-4. TROUBLESHOOTING CHECK TABLE
No.
Symptom
1
Outdoor
unit does
not operate.
2
Indication
Abnormal point / Condition
LED1(Red) LED2(Yellow)
Lighted
Once
Lighted
Twice
Lighted
3 times
Lighted
4 times
3
4
5
6
7
Lighted
5 times
Lighted
7 times
Lighted
8 times
8
9
10
11
12
13 'Outdoor unit
stops and
restarts
3 minutes
later' is
14 repeated.
Lighted
11 times
Lighted
12 times
Zero cross detecting
circuit
Lighted
13 times
Current sensor
Lighted
14 times
Voltage sensor
Lighted
15 times
Relay operation
Twice
Not lighted
3 times
Not lighted
4 times
Not lighted
5 times
Not lighted
6 times
Not lighted
8 times
Not lighted
9 times
Not lighted
11 times
Not lighted
15
16
17
18
19
20
OBH702A
Condition
The indoor unit detects an abnormality in the LEV
LEV and drain pump
and drain pump.
Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor
Outdoor power
gets started, or converter protection cut-out or bussystem
bar voltage protection cut-out operates 3 consecutive times within 3 minutes after start-up.
A short circuit is detected in the thermistor during
Discharge temperature
operation, or an open circuit is detected in the
thermistor
thermistor after 10 minutes of compressor start-up.
Fin temperature
thermistor
A short or open circuit is detected in the thermistor
during operation.
P. C. board temperature thermistor
Ambient temperature
A short or open circuit is detected in the thermistor
thermistor
during operation.
A short circuit is detected in the thermistor during
Outdoor heat exoperation, or an open circuit is detected in the
changer temperature
thermistor after 5 minutes (in cooling) and 10
thermistor
minutes (in heating) of compressor start-up.
A short circuit is detected in the thermistor during
Defrost thermistor
operation, or an open circuit is detected in the
thermistor after 5 minutes of compressor start-up.
The nonvolatile memory data cannot be read
Outdoor control system
properly.
Current sensor protection cut-out operates 2 conCurrent sensor
secutive times.
Communication error
The communication protection cut-out between
between P.C. boards
boards operates 2 consecutive times.
M-NET communication M-NET adapter P.C. board detects an abnormality
error
in the communication error.
The protection cut-out of the zero cross detecting
circuit operates 10 consecutive times.
A short or open circuit is detected in the input current detection circuit during operation.
A short or open circuit is detected in the input voltage detection circuit during operation.
No relay operation is detected during operation.
Overcurrent is detected after 30 seconds of compressor start-up.
Remedy
• Refer to 11-6. "Check of LEV".
• Check the drain pump of the indoor unit.
• Check the connection of the compressor connecting wire.
• Refer to 11-6. "How to check inverter/compressor".
• Check the stop valve.
• Refer to 11-6.
"Check of outdoor thermistors".
• Refer to 11-6.
"Check of outdoor thermistors".
• Replace the outdoor control P.C. board.
• Refer to 11-6.
"Check of outdoor thermistors".
• Replace the outdoor control P.C. board.
• Replace the outdoor power P.C. board.
• Check the connecting wire between outdoor control P.C. board and outdoor power P.C. board.
• Check the connecting wire between M-NET
adapter P.C. board and outdoor control P.C.
board, or terminal bed.
• Check the connecting wire among outdoor control
P.C. board and outdoor power P.C. board.
• Replace the outdoor power P.C. board.
• Replace the outdoor power P.C. board.
• Replace the outdoor power P.C. board.
• Reconnect compressor connector.
IPM protection
• Refer to 11-6. "How to check inverter/
compressor".
Overcurrent is detected within 30 seconds of com- • Check the stop valve.
Lock protection
pressor start-up.
• Check the power module (PAM module).
The discharge temperature exceeds 240.8 °F durDischarge temperature ing operation.
• Check the amount of gas and refrigerant circuit.
protection
Compressor can restart if discharge temperature
• Refer to 11-6. "Check of LEV".
thermistor reads 212 °F or less 3 minutes later.
Fin temperature
The fin temperature exceeds during operation.
protection
•Check refrigerant circuit and refrigerant amount.
P.C. board temperature The P.C. board temperature exceeds during opera- •Refer to 11-6. "Check of outdoor fan motor".
protection
tion.
High-pressure is detected with the high-pressure
switch (HPS) during operation.
High-pressure
• Check around of gas and the refrigerant circuit.
The outdoor heat exchanger temperature exceeds • Check the stop valve.
protection
158 °F during cooling or the indoor gas pipe temperature exceeds 158 °F during heating.
• Reconnect compressor connector.
• Refer to 11-6. "How to check inverter/
Pre-heating protection Overcurrent is detected during pre-heating.
compressor".
• Check the power module.
A failure is detected in the operation of the convertConverter protection
• Replace the outdoor power P.C. board.
er during operation.
• Check the voltage of power supply.
Bus-bar voltage
The bus-bar voltage exceeds 400 V or falls to low • Replace the outdoor power P.C. board or the outprotection
level during compressor operating.
door control P.C. board.
• Refer to 11-6. "Check of bus-bar voltage".
Low out side temperaThe ambient became 10.4°F or less.
ture protection(cooling)
The ambient became 1.4°F or less. (MXZ-3C24NA,
—
Low out side tempera- MXZ-3C30NA, MXZ-4C36NA, MXZ-5C42NA)
ture protection(Heating) The ambient became -18°F or less. (MXZ-2C20
NAHZ, MXZ-3C24NAHZ, MXZ-3C30NAHZ)
63
No.
Symptom
21 'Outdoor unit
stops and
22 restarts
3 minutes
later' is
23
repeated.
24
25 Outdoor unit
operates.
26
Indication
Abnormal point / Condition
LED1(Red) LED2(Yellow)
13 times
Not lighted
Lighted
8 times
Lighted
11 times
Lighted
12 times
Once
Lighted
Twice
Lighted
3 times
Lighted
4 times
Lighted
27
28
Outdoor fan motor
A failure occurs 3 consecutive times within 30
seconds after the fan gets started.
A short or open circuit is detected in the current
sensor during compressor operating.
Communication error occurs between the outdoor
control P.C. board and outdoor power P.C. board
for more than 10 seconds.
Zero cross signal cannot be detected while the
compressor is operating.
Current sensor protection
Communication
between P.C. boards
protection
Zero cross detecting
circuit protection
Primary current protecThe input current exceeds 15 A.
tion
High-pressure protec- The indoor gas pipe temperature exceeds 113 °F
tion
during heating.
The indoor gas pipe temperature falls 37.4 °F or
Defrosting in cooling
below during cooling.
The frequency of the compressor is kept 80 Hz or
Discharge temperature more and the discharge temperature is kept under
protection
122 °F(COOL mode)/104 °F(HEAT mode) for more
than 40 minutes.
The frequency of the compressor is kept 80 Hz or
Low discharge
more and the discharge temperature is kept under
temperature protection
102.2 °F for more than 20 minutes.
29
30 Outdoor
unit
31 operates
normally.
Condition
5 times
Lighted
Cooling high-pressure
protection
9 times
Lighted
Inverter check mode
Lighted
Lighted
Normal
Remedy
• Refer to 11-6.
"Check of outdoor fan motor".
• Replace the outdoor power P.C. board.
• Check the connecting wire between outdoor control P.C. board and outdoor power P.C. board.
• Check the connecting wire among outdoor control
P.C. board and outdoor power P.C. board.
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.
• Check refrigerant circuit and refrigerant amount.
• Refer to 11-6. "Check of LEV".
• Refer to 11-6. "Check of outdoor thermistors".
• Refer to 11-6. "Check of LEV".
• Check refrigerant circuit and refrigerant amount.
This symptom does not mean any abnormality of
the product, but check the following points.
The outdoor heat exchanger temperature exceeds • Check if indoor filters are clogged.
136.4 °F during operation.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circulation is short
cycled.
The unit is operated with emergency operation
—
switch.
—
—
NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1.
2. LED is lighted during normal operation.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
0.5-second ON
0.5-second ON
Outdoor control P.C. board
(Parts side)
ON
OFF
LED1 LED2
2.5-second OFF
OBH702A
2.5-second OFF
Lighted
64
11-5. TROUBLE CRITERION OF MAIN PARTS
MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA
MXZ-5C42NA
MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
Part name
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Compressor
W
RED
V
WHT
Check method and criterion
Measure the resistance with a tester.
Refer to 11-7. “Test point diagram and voltage”, 1. ”Outdoor control P.C.board”,
2. ”Outdoor power P.C. board”, for the chart of thermistor.
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 11-7. “Test point diagram and voltage”,1. ”Outdoor control P.C. board” for the chart of
thermistor.
Measure the resistance between terminals using a tester.
(Winding temperature: 14°F ~ 104°F)
Normal (Each phase)
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
ŸaŸ
U
BLK
Measure the resistance between terminals using a tester.
(Winding temperature: 14°F ~ 104°F)
Normal (Each phase)
MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
ŸaŸ
‡5HIHUWR
Outdoor fan motor
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
Normal (Each phase)
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
NŸaNŸ
R.V. coil
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
Normal (Each phase)
MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
NŸaNŸ
2-way valve solenoid coil
MXZ-5C42NA
MXZ-2C20NAHZ
MXZ-3C24NAHZ
MXZ-3C30NAHZ
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
Normal
MXZ-5C42NA
MXZ-2C20NAHZ
MXZ-3C24NAHZ
MXZ-3C30NAHZ
Linear expansion valve
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
Color of lead wire
Normal
WHT - RED
RED - ORN
37.4Ÿ ~ 53.Ÿ
YLW - RED
RED - BLU
NŸaNŸ
WHT
LEV
RED
ORN
YLW
BLU
High pressure switch
(HPS)
Defrost heater
MXZ-2C20NAHZ
MXZ-3C24NAHZ
MXZ-3C30NAHZ
OBH702A
HPS
Pressure
537 ± 22 PSIG
7 PSIG
+- 15
Normal
Close
Open
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
Normal
0.35NŸa 0.50NŸ
65
11-6. TROUBLESHOOTING FLOW
Outdoor unit does not operate.
Check of power supply
Check the main power supply circuit for proper connections.
Turn ON the power supply.
Is there voltage of 208/230 VAC in the
power supply terminal block?
No
Check the power supply cable.
Yes
Is the output voltage from the outdoor
power P.C. board 294/325 VDC?
Yes
Replace the outdoor control P.C. board.
No
Turn OFF the power supply and recconnect the reactor.
Is the reactor short-circuited?
No
Replace the reactor.
Yes
Replace the outdoor power P.C. board.
OBH702A
66
• When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.
Indoor unit does not operate.
• When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
Outdoor unit does not operate.
How to check miswiring and serial signal error (when outdoor unit does not work)
Turn OFF the power supply.
LED indication
for communication status
Communication status is indicated
by the LED.
Unit status
Blinking: normal communication
Lighting: abnormal communication or
not connected
Pattern 1 and 2 is repeatedly displayed
alternately. Each pattern is displayed for
15 seconds.
NOTE: "Lighting" in the table below does not
indicate abnormal communication.
No
Is there rated voltage in
the power supply?
Check the power
supply.
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
No
Check the wiring.
Yes
Outdoor control P.C. board
Press EMERGENCY OPERATION switch once.
LED1 LED2 LED3
Does the left lamp of OPERATION
INDICATOR lamp light up?
<Confirmation of the power to the indoor unit>
Blinking
Pattern
1
2
3
LED 1
LED 2
LED 3
Unit A
status
Unit C
status
Unit E
status
Unit B
status
Unit D
status
Lighted
Not lighted
No
Yes
Is serial signal error indicated 6 minutes later?
Blinking
No
Yes
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor
connecting wire?
Yes
Correct them.
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
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.
Turn ON the power supply.
Does the LED on the outdoor control P.C.
board repeat "3.6-second-OFF
and 0.8-second-ON quick blinking"?
No
(Lighted
or
not lighted)
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
OBH702A
· Reinstall
either the
unit or the
light away
No from each
other.
· Attach a filter
on remote
control
receiving
section of
the indoor
unit.
Turn OFF the power supply.
Remove the bridge 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>
Replace the outdoor control P.C. board.
2
2 Be careful of the residual
voltage of smoothing capacitor.
No
Yes
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
No
Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode
recall function after checking.
Refer to indoor unit service manual.
67
Yes Replace the
indoor/outdoor
connecting wire.
The cooling operation or heating operation does not operate.
Check of R.V. coil
‡:KHQFRROLQJRSHUDWLRQGRHVQRWZRUN
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning ON the power supply, start EMERGENCY
OPERATION in COOL mode.
Is there voltage of 208/230 VAC between pin 1
and pin 2 at connector CN712?
No
Is there voltage 208/230 VAC
between the pin 1 and pin 3 at
connector CNAC?
Yes
Yes
Turn OFF the power supply.
Disconnect the connector CNAC2.
Is there normal resistance
No
to R.V. coil? (Refer to 11-5.)
Replace the outdoor
control P.C. board.
Replace the R.V. coil.
Yes
Replace the 4-way valve.
‡:KHQKHDWLQJRSHUDWLRQGRHVQRWZRUN
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 CN712?
No
Replace the 4-way valve.
Yes
Replace the outdoor control P.C. board.
OBH702A
68
No
CNAC
CN712
Outdoor control
P.C. board
CNAC2
Outdoor power
P.C. board
Replace the outdoor
power P.C. board.
• When cooling, heat exchanger of non-operating indoor unit frosts.
• When heating, non-operating indoor unit gets warm.
Check of LEV
Turn ON the power supply to the outdoor unit after checking LEV coil is
mounted to the LEV body securely.
Yes
Is "click - click" sound heard?
Or, do you feel vibration of LEV coil with your hand?
CN791
CN792
CN793
CN794
CN795
Outdoor
control
P.C. board
Normal
No
Disconnect the connectors.
CN791: LEV A, CN792: LEV B, CN793: LEV C
(MXZ-3C/4C/5C), CN794: LEV D (MXZ-4C/5C),
CN795: LEV E (MXZ-5C)
Is there normal resistance to LEV coil?
(Refer to 11-5.)
Yes
Replace the outdoor control P.C. board.
No
Replace LEV coil.
OBH702A
69
• When heating, room does not get warm.
• When cooling, room does not get cool.
How to check inverter/compressor
Disconnect the terminal of the compressor or the connector (CNMC) between the compressor
and the outdoor power P.C. board. 3 minutes after the power supply is turned ON,
start EMERGENCY OPERATION.
Measure the voltage between each
lead wire leading to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Output voltage: 99
Is proper output voltage detected?
‡$IWHUWKHRXWGRRUIDQVWDUWVUXQQLQJZDLWIRUPLQXWH
or more before measuring the voltage.
‡7KHRXWSXWYROWDJHYDOXHVKDYHWKHWROHUDQFHRI“
‡7KHRXWSXWGLIIHUVGHSHQGLQJRQWKHFDSDFLW\RUWKH
number of indoor units to be operated.
No
Yes
Is output balanced?
No
Yes
Is the input voltage to the outdoor control
P.C. board 370 V or more?
No
Replace the outdoor power P.C. board.
Yes
Turn OFF the power supply of indoor and
outdoor unit, and measure the compressor
winding resistance between the compressor
terminals.
Is the resistance between each terminal normal?
(Refer to 11-5.)
Yes
No
Reconnect the lead wire of compressor, and turn ON
the power supply to indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor layer short
10 to 60 seconds: compressor lock
60 seconds to 5minutes: refrigerant circuit defective
5 minutes or more: normal
OBH702A
70
Replace the compressor.
• When thermistor is abnormal.
Check of outdoor thermistors
Disconnect the connector in the following table and
measure the resistance of the thermistor to check
whether the thermistor is normal or not. (Refer to 11-7.)
Abnormal
Replace the thermistor except RT64.
In case that RT64 is abnormal, replace the
outdoor power P.C. board since RT64 is combined
with the outdoor power P.C. board.
No
Replace the outdoor control P.C. board or the
outdoor power P.C. board.
Normal
Reconnect the connector in the following table and
disconnect the lead wire leading to the compressor.
3 minutes after turning ON the power supply,
start EMERGENCY OPERATION.
Does the unit operate 10 minutes or more without
showing thermistor abnormality?
Yes
Normal
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Ambient temperature
Fin temperature
OBH702A
Symbol
RT61
RT62
RT68
RT65
RT64
Connector, Pin No.
Between CNTH1 pin1 and pin2
Between CNTH1 pin3 and pin4
Between CNTH1 pin7 and pin8
Between CNTH2 pin1 and pin2
Between CN171 pin1 and pin2
71
Board
Outdoor control P.C. board
Outdoor power P.C. board
• Fan motor does not operate or stops operating shortly after starting the operation.
Check of outdoor fan motor
Disconnect CNF1 and measure the
resistance of the outdoor fan motor.
Is the resistance of outdoor fan motor
normal? (Refer to right table)
CNF1
No
Replace the outdoor fan motor.
No
Replace the outdoor fan motor.
Yes
Voltage
CNF1
Turn on the power supply to start operation
and measure the voltage of connector CNF1.
pin 1 - pin 4 294/325 VDC
pin 5 - pin 4
15 VDC
pin 6 - pin 4
1 - 5 VDC
pin 5 - pin 4
NŸ
pin 6 - pin 4
NŸ
pin 7 - pin 4
* To measure the resistance, connect
the negative (-) end of the tester to pin 4.
* To measure the voltage, connect the negative (-)
end of the tester to pin 4.
* Voltage between pin 4 and 6 should be measured
within 1 minute after the operation starts.
Is the voltage of connector CNF1
normal? (Refer to right table.)
No
Replace the outdoor control P.C. board.
Yes
Turn OFF the power supply and connect
the connector CNF1.
Turn ON the power supply and measure
the voltage of connector CNF1 while
rotating the motor by the hand.
Does the voltage between pin 7 and pin 4
of connector CNF1 repeat 0V and 5V?
No
Replace the outdoor fan motor.
Yes
Start operation.
Does the fan motor operate for about
5 seconds?
No
Replace the outdoor fan motor.
Yes
Replace the outdoor control P.C. board.
OBH702A
Resistance
pin 1 - pin 4
Yes
Does the outdoor fan motor rotate smoothly?
Measuring points
Outdoor control
P.C. board
72
• When the operation frequency does not go up from the lowest frequency.
Check of HPS
CN63H
Outdoor control
P.C. board
1. Disconnect the connector CN63H in the outdoor control P.C. board.
2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF.
Infinity
Check the resistance between each terminal.
Ÿ
Replace HPS.
Reconnect CN63H.
Turn ON the power supply to the indoor and outdoor unit.
3 minutes later, start EMERGENCY OPERATION.
Is HPS protection displayed immediately
after compressor starts?
Yes
Replace the outdoor control P.C. board.
No
Normal
The other cases
Indoor unit does not operate. (different operating models in multi system)
• When you try to run two indoor units simultaneously, one for cooling and the other for heating, the unit which
transmits signal to the outdoor units first decides the operation mode.
• When the above situation occurs, set all the indoor units to the same mode, turn OFF the indoor units, and
then turn them back ON.
• Though the top of the indoor unit sometimes gets warm, this does not mean malfunction. The reason is that
the refrigerant gas continuously flows into the indoor unit even while it is not operating.
Check of bus-bar voltage
•Check the voltage of power supply.
•Confirm outdoor unit failure mode
recall function. (Refer to 11-2.2.)
Confirm LED1 indication lamp on the
outdoor control P.C. board.
Blink 5 times
Lighting
Replace the outdoor power
P.C. board.
Replace the outdoor control
P.C. board.
Turn ON power supply. Start
operation.
Turn ON power supply. Start
operation.
Confirm LED1 indication lamp
on the outdoor control P.C.
board.
Blink 9 times
Lighting
Normal
Lighting
Replace the outdoor control
P.C. board.
Replace the outdoor power
P.C. board.
Turn OFF power supply before removing P.C. board.
OBH702A
Confirm LED1 indication lamp
on the outdoor control P.C.
board.
Blink 9 times
73
Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature
thermistor (RT68)
11-7. TEST POINT DIAGRAM AND VOLTAGE
1. Outdoor control P.C. board
Serial signal 12 ~ 24 V
MXZ-3C24NA
MXZ-3C30NA
230 VDC Room A Room B Room C Room D Room E
MXZ-4C36NA
MXZ-5C42NA
Input
MXZ-2C20NAHZ MXZ-3C24NAHZ
MXZ-3C30NAHZ
CN601
)
100
5HVLVWDQFHNŸ
CN611
CN741
Signal translation
(To Communication
adaptor board)
90
CN621
80
70
60
50
40
30
20
10
0
-20
-4
-10
14
0
32
10
50
20
68
30
86
40 (ºC)
104 (ºF)
Temperature
Thermistor R25 = 10 kŸ ± 2%
B constant = 3950 ± 2%
1 )}
Rt = 10exp{3950( 1
273+t 298
t : ºC = (ºF - 32)/1.8
CN930
To fan motor
F711 FUSE
T3.15AL250V
CNAC
to outdoor power P.C.
board 208/230 VAC
Input
CN714 Base heater
208/230 VAC
Input
Bus-bur voltage
290 ~ 370 VDC
15 VDC
Rotate instruction
(Constant voltage)
Rotate signal
(Pulse wave)
CN713 Valve coil
208/230 VAC
Input
CNDC
Bus-bur
voltage
290 ~ 370
VDC
CN712 R.V. coil
208/230 VAC
Input
CNTH2
Ambient temperature
thermistor
(RT65)
CNTH1
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Defrost thermistor
(RT61)
CN63H
High
pressure
switch
SW1
SW871
(
LEV: 12 VDC
pulse wave
LED3
LED2
LED1
Discharge temperature thermistor (RT62)
700
600
5HVLVWDQFHNŸ
CN795 LEV Room E
CN794 LEV Room D
CN793 LEV Room C
CN792 LEV Room B
CN791 LEV Room A
(-)
(+)
CN701 Signal
transmission
(To power board)
5 VDC pulse wave
15 V: MXZ-3C24/3C30/
4C36NA
18 V: MXZ-5C42NA,
MXZ-2C20/3C24/
3C30NAHZ
CN702 Signal
(+)
transmission
V
(-)
(To power board)
5 VDC pulse wave 15(-)
V
(-)
SW872
SW2
500
400
300
200
100
0
0
32
OBH702A
74
10
50
20
68
30
86
40 50 60 70 80 90 100 110 120 (ºC)
104 122 140 158 176 194 212 230 248 (ºF)
Temperature
Thermistor R100 = 13.36 kŸ ± 2%
B constant = 4014 ± 2%
1 )}
Rt = 13.36exp{4014( 1
273+t 373
t : ºC = (ºF - 32)/1.8
2. Outdoor power P.C. board
Output to drive compressor
(+)
15 V
(-)
(-)
15 V
CN151 Signal transmission
(To Outdoor control
P.C. board)
5 VDC pulse wave
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
CN171
Fin temperature thermistor
(RT64)
(-) CN152
(+) Signal Transmission
(From Outdoor
Control P.C. board)
5 VDC pulse wave
Connect to earth
CNAC2
208/230 VAC
Output
F1 FUSE
T6.3AL250V
208/230 VAC
Input
F2 FUSE
T6.3AL250V
CNAC1
208/230 V Output
Connect to reactor
(Red line)
Connect to reactor
(White line)
CNDC
Bus-bur voltage
290 - 370 VDC
Fin temperature thermistor (RT64)
200
5HVLVWDQFHNŸ
180
160
140
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 ƒ&
32 50 68 86 104 122 140 158 176 ƒ)
Temperature
Thermistor R50 = 17 kŸ ± 2%
B constant = 4150 ± 3%
1
1
5W H[S^`
273+t 323
t : ºC = (º)
OBH702A
75
Connect to earth
2. Outdoor power P.C. board
Output to drive compressor
(+)
18 V
(-)
(-)
15 V
15 V
CN171
Fin temperature thermistor
(RT64)
CN151 Signal transmission
(To Outdoor control
P.C. board)
5 VDC pulse wave
MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
CNDC
Bus-bur voltage
290 - 370 VDCCNAC1
Connect to earth
208/230 V Output
F1 FUSE
T6.3AL250V
CN152
Signal
Transmission
(From Outdoor
Control P.C. board)
5 VDC pulse wave
(+)
(-)
F2 FUSE
T6.3AL250V
Connect
to earth
Connect to reactor Connect to reactor
(White line)
(Red line)
Connect
to earth
Fin temperature thermistor (RT64)
200
5HVLVWDQFHNŸ
180
160
140
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 ƒ&
32 50 68 86 104 122 140 158 176 ƒ)
Temperature
Thermistor R50 = 17 kŸ ± 2%
B constant = 4150 ± 3%
1
1
5W H[S^`
273+t 323
t : ºC = (º)
OBH702A
76
CNAC2
208/230
VAC Output
208/230 VAC Input
12
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.
Pull the terminal while
pushing the locking
lever.
Locking lever
Hold the sleeve, and
pull out the terminal
slowly.
Connector
12-1. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
Photos : MXZ-4C36NA
NOTE: Turn OFF the power supply before disassembly.
OPERATING PROCEDURE
PHOTOS
Photo 1
1. Removing the panels
(1) Remove the screws fixing the top panel, and remove the
top panel.
(2) Remove the screws fixing the service panel.
(3) Pull down the service panel, and remove the service
panel.
(4) Disconnect the power supply and indoor/outdoor connecting wire.
(5) Remove the screws fixing the front panel, and remove the
front panel.
(6) Remove the screws fixing the back panel, and remove
the back panel.
Screws of the top panel
Photo 3
Catch of the front panel
Catch of the front panel
Screws of the front panel
Screws of the service panel
Photo 2
Screws of the front panel
Screws of the back panel
OBH702A
77
Screws of the top panel
OPERATING PROCEDURE
PHOTOS
2. Removing the outdoor control P.C. board, the reactor and the outdoor power P.C. board
Photo 4
Catches of the PB cover
(1) Remove the top panel and the service panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting wire.
(3) Disconnect the connectors on the outdoor control P.C.
board.
(4) Remove the screws fixing the outdoor control P.C. board
holder, and remove the outdoor control P.C. board.
(5) Disconnect the lead wire from the reactor.
(6) Remove the screws fixing the reactor, and remove the
reactor.
(7) Disconnect the lead wire of the power P.C. board.
(8) Disconnect the catches of the PB cover, and remove the
PB cover.
(9) Remove the outdoor power P.C. board.
Screws
of the
electrical
parts
Photo 6
Photo 5
Screws of the reactor
Screws of the outdoor control P.C. board holder
OBH702A
78
OPERATING PROCEDURE
PHOTOS
3. Removing the fan motor
(1) Remove the top panel, the service panel, and the front
panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting wire.
(3) Disconnect the connector CNF1 on the outdoor control P.C.
board.
(4) Remove the propeller fan.
(5) Remove the fan motor.
Photo 7
Propeller fan
Screws of the outdoor fan motor
Photo 8
4. Removing the compressor and 4-way valve
4-way valve
(1) Remove the top panel, the service panel, and the front
panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting wire, and remove the back panel.
(3) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure
gauge shows 0 kg/cm2 (0 MPa).
(4) Disconnect the compressor lead wire from the terminal of
the compressor (U, V, W).
(5) Disconnect the outdoor control P.C. board connectors:
CNF1, CNTH1, CNTH2, CN63H, CN712, CN791, CN792,
CN793, CN794 (MXZ-4C)
(6) Remove the screws fixing the electrical parts, and remove
the electrical parts (Photo 4).
(7) Remove the propeller fan.
(8) Remove the screws fixing the separator, and remove the
separator.
(9) Remove the sound proof felt.
(10) Detach the brazed parts of the compressor suction and
discharge pipes (Photo 9).
(11) Remove the compressor nuts and remove the compressor
(Photo 9).
(12) Detach the brazed parts of 4-way valve and pipes.
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R.V. coil
Brazed parts
OPERATING PROCEDURE
PHOTOS
5. Removing the expansion valve
Photo 9
(1) Remove the top panel, and the service panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting wire.
(Gas recovery is not required if the unit is pumped down.)
Discharge pipe
(3) Remove the LEV coils.
brazed part
(4) Detach the brazed parts of the expansion valves and
pipes.
Expansion
valves
Suction pipe
brazed part
Compressor nuts
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Expansion
valves
LEV coils
12-2. MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
Photos : MXZ-3C30NAHZ
NOTE: Turn OFF the power supply before disassembly.
OPERATING PROCEDURE
PHOTOS
Photo 1
1. Removing the panels
(1) Remove the screws fixing the top panel, and remove the
top panel.
(2) Remove the screws fixing the service panel.
(3) Pull down the service panel, and remove the service
panel.
(4) Disconnect the power supply and indoor/outdoor connecting wire.
(5) Remove the screws fixing the front panel, and remove the
front panel.
(6) Remove the screws fixing the back panel, and remove
the back panel.
Screws of the top panel
Photo 3
Screws of the front panel
Photo 2
Screw of the back panel
Screws of the front panel
Screws of the back panel
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Screws of the service panel
Screws of the top panel
OPERATING PROCEDURE
PHOTOS
2. Removing the outdoor control P.C. board, the reactor and the outdoor power P.C. board
(1) Remove the top panel, the service panel and the front
panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting wire.
(3) Disconnect the connectors on the outdoor control P.C. board.
(4) Remove the screws fixing the outdoor control P.C. board,
and remove the outdoor control P.C. board.
(5) Remove the screws fixing the electrical parts, and remove
the electrical parts.
(6) Remove the screws fixing the TB support, and remove the
TB support.
(7) Remove the screws fixing the control box separator, and
remove the control box separator.
(8) Disconnect the lead wire of the outdoor power P.C. board.
(9) Remove the screws fixing the outdoor power P.C. board,
and remove the outdoor power P.C. board with the outdoor P.C. board holder.
(10) Remove the screws fixing the control box F, and remove
the control box F.
(11) Remove the screws fixing the reactors, and remove the
reactors.
Photo 7
Screw
of the
electrical
parts
Photo 4
Screws
of the
electrical
parts
Photo 5
Screws
of the
outdoor
control
P.C.
board
Photo 6
Screws of the TB support
Screws of the control box F
Photo 8
Screws of
the reactor
Screws of the control box separator
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Screws of the
outdoor power
P.C. board
OPERATING PROCEDURE
PHOTOS
3. Removing the fan motor
(1) Remove the top panel, the service panel, and the front
panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting wire.
(3) Disconnect the connector CNF1 on the outdoor control P.C.
board.
(4) Remove the propeller fan.
(5) Remove the fan motor.
Photo 9
Screws of the outdoor fan motor
Screw of the
VB fixture
Propeller
fan
Screws of the outdoor fan motor
VB fixture
Separator
4. Removing the compressor and 4-way valve
(1) Remove the top panel, the service panel and the front
panel.
(2) Disconnect the power supply and indoor/outdoor connecting wire, and remove the back panel.
(3) Recover gas from the refrigerant circuit.
NOTE: Recover gas from the pipes until the pressure
gauge shows 0 kg/cm2 (0 MPa).
(5) Disconnect the compressor lead wire from the terminal of
the compressor (U, V, W).
(6) Disconnect the outdoor control P.C. board connectors:
CNF1, CNTH1, CNTH2, CN63H, CN712, CN713, CN714
(MXZ-C·NAHZ), CN791, CN792, CN793 (MXZ-5C42NA,
MXZ-3C24/30NAHZ), CN794 (MXZ-5C42NA),
CN795 (MXZ-5C42NA)
(7) Remove the screws fixing the electrical parts, and remove
the electrical parts (Photo 4).
(8) Remove the propeller fan.
(9) Remove the screws fixing the VB fixture, and remove the
VB fixture.
(10) Remove the screws fixing the separator, and remove the
separator.
NOTE: When installing the separator, insert the tabs of the
heat exchanger into the separator.
(11) Remove the sound proof felt.
(12) Detach the brazed parts of the suction and discharge
pipes (Photo 11).
(13) Remove the nuts of the compressor, and remove the
compressor (Photo 11).
(14) Detach the brazed parts of 4-way valve and pipes.
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Sound
proof felt
Photo 10
R.V. coil
4-way valve
Brazed parts
OPERATING PROCEDURE
PHOTOS
5. Removing the expansion valve
(1) Remove the top panel, and the service panel (Refer to 1).
(2) Disconnect the power supply and indoor/outdoor connecting wire.
(Gas recovery is not required if the unit is pumped down.)
(3) Remove the LEV coils.
(4) Detach the brazed parts of expansion valves and pipes.
Photo 11
Discharge pipe
brazed part
Compressor nuts
Suction pipe
brazed part
LEV coils
Expansion
valves
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2014 MITSUBISHI ELECTRIC CORPORATION
Distributed in Oct. 2014. No. OBH702 REVISED EDITION-A
Distributed in Sep. 2014. No. OBH702
Made in Japan
OBH702A
84
New publication, effective Oct. 2014
Specifications are subject to change without notice.