Mitsubishi Electric MXZ-3C24NA, MXZ-4C36NA, MXZ-5C42NA, MXZ-3C24NAHZ, MXZ-3C30NAHZ Service Manual

HFC

utilized

R410A

TM

INDOOR UNIT

OUTDOOR UNIT

SERVICE MANUAL

Models

MXZ-3C24NA

Revision A:

• MXZ-3C24NA, MXZ-3C30NA and MXZ­4C36NA have been added.

Please void OBH702.

No. OBH702

REVISED EDITION-A

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)

Revision A:

OBH702A

• MXZ-3C24NA, MXZ-3C30NA and MXZ-4C36NA have been added.

Use the specifi ed 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

2

2

Air outlet

Drain outlet

Air inlet

(Back and side)

OBH702A

PART NAMES AND FUNCTIONS

MXZ-3C24NA
MXZ-3C30NA
MXZ-4C36NA

MXZ-5C42NA
MXZ-2C20NAHZ
MXZ-3C24NAHZ
MXZ-3C30NAHZ

Air inlet

(Back and side)

Air outlet

Drain outlet

3

Cooling

Heating

Mode

*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

Test

Indoor air condition Outdoor air condition
Dry bulb

Wet bulb

Dry bulb

Wet bulb

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

Unit: °F

3

OBH702A

SPECIFICATION

Item

Cooling *1 Btu/h

Capacity

Power
consumption

EER Cooling
SEER Cooling
HSPF IV(V) Heating
COP Heating
External fi nish
Power supply V, phase, Hz
Max. fuse size (time delay) A
Min. circuit ampacity A
Fan motor F.L.A

Compressor

Refrigerant control
Sound level dB(A)
Defrost method

Dimensions

Weight lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping

Valve size

Connection method

Refrigerant charge (R410A) lb.
Refrigeration oil (Model) oz.

NOTE : Test conditions are based on ARI 210/240.

Heating 47 *1 Btu/h
Heating 17 *2 Btu/h
Cooling *1 W
Heating 47 *1 W
Heating 17 *2 W

Model
Winding resistance

(at 68 ºF)

W in.
D in.
H in.

Liquid in.
Gas in.
Indoor
Outdoor

Outdoor model

Indoor type

R.L.A
L.R.A

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

Ω

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)

4

Cooling

Heating

Mode

*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

Test

Indoor air condition Outdoor air condition
Dry bulb

Wet bulb

Dry bulb

Wet bulb

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

Unit: °F

Item

OBH702A

Cooling *1 Btu/h

Capacity

Power
consumption

EER Cooling
SEER Cooling
HSPF IV(V) Heating
COP Heating
External fi nish
Power supply V, phase, Hz
Max. fuse size (time delay) A
Min. circuit ampacity A
Fan motor F.L.A

Compressor

Refrigerant control
Sound level dB(A)
Defrost method

Dimensions

Weight lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping

Valve size

Connection method

Refrigerant charge (R410A) lb.
Refrigeration oil (Model) oz.

NOTE : Test conditions are based on ARI 210/240.

Heating 47 *1 Btu/h
Heating 17 *2 Btu/h
Cooling *1 W
Heating 47 *1 W
Heating 17 *2 W

Model
Winding resistance

(at 68 ºF)

W in.
D in.
H in.

Liquid in.
Gas in.
Indoor
Outdoor

Outdoor model

Indoor type

R.L.A
L.R.A

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

Ω

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)

5

Cooling

Heating

Mode

*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

Test

Indoor air condition Outdoor air condition
Dry bulb

Wet bulb

Dry bulb

Wet bulb

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

Unit: °F

Item

OBH702A

Cooling *1 Btu/h

Capacity

Power
consumption

EER Cooling
SEER Cooling
HSPF IV(V) Heating
COP Heating
External fi nish
Power supply V, phase, Hz
Max. fuse size (time delay) A
Min. circuit ampacity A
Fan motor F.L.A

Compressor

Refrigerant control
Sound level dB(A)
Defrost method

Dimensions

Weight lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping

Valve size

Connection method

Refrigerant charge (R410A) lb.
Refrigeration oil (Model) oz.

NOTE : Test conditions are based on ARI 210/240.

Heating 47 *1 Btu/h
Heating 17 *2 Btu/h
Cooling *1 W
Heating 47 *1 W
Heating 17 *2 W

Model
Winding resistance

(at 68 ºF)

W in.
D in.
H in.

Liquid in.
Gas in.
Indoor
Outdoor

Outdoor model

Indoor type

R.L.A
L.R.A

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

Ω

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)

6

Cooling

Heating

Mode

*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

Test

Indoor air condition Outdoor air condition
Dry bulb

Wet bulb

Dry bulb

Wet bulb

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

Unit: °F

Item

OBH702A

Cooling *1 Btu/h

Capacity

Power
consumption

EER Cooling
SEER Cooling
HSPF IV(V) Heating
COP Heating
External fi nish
Power supply V, phase, Hz
Max. fuse size (time delay) A
Min. circuit ampacity A
Fan motor F.L.A

Compressor

Refrigerant control
Sound level dB(A)
Defrost method

Dimensions

Weight lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping

Valve size

Connection method

Refrigerant charge (R410A) lb.
Refrigeration oil (Model) oz.

NOTE : Test conditions are based on ARI 210/240.

Heating 47 *1 Btu/h
Heating 17 *2 Btu/h
Cooling *1 W
Heating 47 *1 W
Heating 17 *2 W

Model
Winding resistance

(at 68 ºF)

W in.
D in.
H in.

Liquid in.
Gas in.
Indoor
Outdoor

Outdoor model

Indoor type

R.L.A
L.R.A

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

Ω

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)

7

Cooling

Heating

Mode

*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

Test

Indoor air condition Outdoor air condition
Dry bulb

Wet bulb

Dry bulb

Wet bulb

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

Unit: °F

Item

OBH702A

Cooling *1 Btu/h

Capacity

Power
consumption

EER Cooling
SEER Cooling
HSPF IV(V) Heating
COP Heating
External fi nish
Power supply V, phase, Hz
Max. fuse size (time delay) A
Min. circuit ampacity A
Fan motor F.L.A

Compressor

Refrigerant control
Sound level dB(A)
Defrost method

Dimensions

Weight lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping

Valve size

Connection method

Refrigerant charge (R410A) lb.
Refrigeration oil (Model) oz.

NOTE : Test conditions are based on ARI 210/240.

Heating 47 *1 Btu/h
Heating 17 *2 Btu/h
Cooling *1 W
Heating 47 *1 W
Heating 17 *2 W

Model
Winding resistance

(at 68 ºF)

W in.
D in.
H in.

Liquid in.
Gas in.
Indoor
Outdoor

Outdoor model

Indoor type

R.L.A
L.R.A

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

Ω

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)

8

Cooling

Heating

Mode

*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

Test

Indoor air condition Outdoor air condition
Dry bulb

Wet bulb

Dry bulb

Wet bulb

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

Unit: °F

Item

OBH702A

Cooling *1 Btu/h

Capacity

Power
consumption

EER Cooling
SEER Cooling
HSPF IV(V) Heating
COP Heating
External fi nish
Power supply V, phase, Hz
Max. fuse size (time delay) A
Min. circuit ampacity A
Fan motor F.L.A

Compressor

Refrigerant control
Sound level dB(A)
Defrost method

Dimensions

Weight lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping

Valve size

Connection method

Refrigerant charge (R410A) lb.
Refrigeration oil (Model) oz.

NOTE : Test conditions are based on ARI 210/240.

Heating 47 *1 Btu/h
Heating 17 *2 Btu/h
Cooling *1 W
Heating 47 *1 W
Heating 17 *2 W

Model
Winding resistance

(at 68 ºF)

W in.
D in.
H in.

Liquid in.
Gas in.
Indoor
Outdoor

Outdoor model

Indoor type

R.L.A
L.R.A

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

Ω

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)

9

Cooling

Heating

Mode

*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

Test

Indoor air condition Outdoor air condition
Dry bulb

Wet bulb

Dry bulb

Wet bulb

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

Unit: °F

Item

OBH702A

Cooling *1 Btu/h

Capacity

Power
consumption

EER Cooling
SEER Cooling
HSPF IV(V) Heating
COP Heating
External fi nish
Power supply V, phase, Hz
Max. fuse size (time delay) A
Min. circuit ampacity A
Fan motor F.L.A

Compressor

Refrigerant control
Sound level dB(A)
Defrost method

Dimensions

Weight lb.
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping

Valve size

Connection method

Refrigerant charge (R410A) lb.
Refrigeration oil (Model) oz.

NOTE : Test conditions are based on ARI 210/240.

Heating 47 *1 Btu/h
Heating 17 *2 Btu/h
Cooling *1 W
Heating 47 *1 W
Heating 17 *2 W

Model
Winding resistance

(at 68 ºF)

W in.
D in.
H in.

Liquid in.
Gas in.
Indoor
Outdoor

Outdoor model

Indoor type

R.L.A
L.R.A

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

Ω

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)

10

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

54

SPL(dB(A))56LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

51

SPL(dB(A))55LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

4

OBH702A

NOISE CRITERIA CURVES

MXZ-3C24NA

MXZ-4C36NA

MXZ-3C30NA

FAN SPEED

90

80

70

60

50

40

30

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR

20

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

FUNCTION

CoolingHigh
HeatingHigh

SPL(dB(A))56LINE

52

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OUTDOOR UNIT

39.4 in.

MICROPHONE

Test conditions
Cooling: Dry-bulb temperature 95°F Wet-bulb temperature 75°F
Heating: Dry-bulb temperature 45°F Wet-bulb temperature 43°F

11

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

54

SPL(dB(A))58LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

54

SPL(dB(A))58LINE

CoolingHigh

FUNCTION

FAN SPEED

HeatingHigh

56

SPL(dB(A))58LINE

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

MXZ-5C42NA

OBH702A

MXZ-2C20NAHZ

MXZ-3C24NAHZ MXZ-3C30NAHZ

90

80

70

60

50

40

30

OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 0.0002 MICRO BAR

20

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

FAN SPEED

FUNCTION

SPL(dB(A))58LINE
CoolingHigh
HeatingHigh

54

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

12

5

OBH702A

OUTLINES AND DIMENSIONS

MXZ-3C24NA
MXZ-3C30NA

Unit: inch (mm)

Conduit plates

Conduit connector

Lock nut

13

MXZ-4C36NA

OBH702A

Unit: inch (mm)

Conduit plates

Conduit connector

Lock nut

14

MXZ-5C42NA

OBH702A

Unit: inch (mm)

Conduit plate Top

Lock nut

Conduit plate Under

Conduit connector

15

MXZ-2C20NAHZ

OBH702A

Unit: inch (mm)

Lock nut

Conduit plate

Conduit connector

16

MXZ-3C24NAHZ

OBH702A

MXZ-3C30NAHZ

Unit: inch (mm)

Lock nut

Conduit plate Top

Conduit connector

Conduit plate Under

17

6

OBH702A

MXZ-3C24NA
MXZ-3C30NA

WIRING DIAGRAM

18

MXZ-4C36NA

OBH702A

19

MXZ-5C42NA

OBH702A

U

BLK
WHT

V

RED

W

OUTDOOR
POWER P.C.
BOARD

CNMC

BLK

MC

RED

WHT

V

U

W

MS

3~

LED3

LED2

LED1

1

t°

t°

RT61

WHT WHT

TAB5

IC501

CNDC

13

MS

MF

3~

5

17

CNF1

15

CN741

CNTH1

t°

RT62

RT68

CNDC

CNTH2

1

8

t°

RT65

BLK

13

2

L1 L2

TAB6

TAB3

IC411

CB1

BRN

IC801

CB3 CB4

CB2

CN151 CN152

BLK

BLK

BLK

BLK

BLK

BLK

17

CN702

OUTDOOR CONTROL P.C. BOARD

T801

(BLK)

CN795

15

5

M

LEV D

LEV E

REDRED
TAB4

IC401

D1

2117

BLK

BLK

BLK

21

CN701

(BLU)

CN793

1515

(YLW)

CN794

15

555

5

M

M

TBE1

BLK

(WHT)
CN791

(RED)

CN792

15

MM

LEV C LEV B LEV A

X52CA

X52CB

X65A

PTC1
PTC2
PTC3

TBE4TBE2 TBE3

BLK

BLK

BLK

1

CNAC

F711

X712 X714

X713

CN712 CN714

CN713

21

21S4 21S2

CIRCUIT
BREAKER

TAB1

TAB2

BLK

CN171

1

t°

RT64

CN63H

CNAC1

2

CN622

CN611

CN601

21

1

BLU

3

5

GRY
YLW

1

3

ORN

WHT
1
5

RED

BLU

BLK
1

F1
F2

CNAC2

1

3

BLK

BLK

3

21

21

HPS

BLK
BLU

GRN/YLW

GRY

YLW

ORN

BLU
BLK

BLU
BLK

BLU
BLK

WHT

BLU
BLK

RED
BLU

BLK

TB1

L1
L2
GR

TB6

TB5

TB4

TB3

TB2

S3
S2
S1

S3
S2
S1

S3
S2
S1

S3
S2
S1

S3
S2
S1

12-24V
~208/230V

12-24V
~208/230V

12-24V
~208/230V

12-24V
~208/230V

12-24V
~208/230V

POWER SUPPLY
208/230V
1 phase 60Hz

TO INDOOR
UNIT No. E

TO INDOOR
UNIT No. D

TO INDOOR
UNIT No. C

TO INDOOR
UNIT No. B

TO INDOOR
UNIT No. A

SYMBOL

SMOOTHING CAPACITOR

CB1~4

D1

DIODE

F1, F2

FUSE (T6.3AL 250V)

F711

FUSE (T3.15AL 250V)

HPS

HIGH PRESSURE SWITCH

IC401

DIODE BRIDGE

IC411

POWER MODULE

IC501

POWER MODULE

IC801

POWER DEVICE

PTC1~3

CIRCUIT PROTECTION

RT61

DEFROST THERMISTOR

RT62

DISCHARGE TEMP . THERMIST OR

RT64

FIN TEMP. THERMISTOR

RT65

AMBIENT TEMP. THERMISTOR
OUTDOOR HEAT EXCHANGER

RT68

TEMPERATURE THERMISTOR

NAME

SYMBOL

L1, L2
LED 1~3
LEV A~E

MC
MF

T801

TB1~6
X52CA, B

X65A
X712
X713
X714
21S2
21S4

NAME
REACTOR
LED
EXPANSION VALVE
COMPRESSOR
FAN MOTOR
TRANSFORMER
TERMINAL BLOCK
RELAY
RELAY
RELAY
RELAY
RELAY
2WAY VALVE SOLENOID COIL
REVERSING VALVE SOLENOID COIL

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

MXZ-2C20NAHZ

OBH702A

21

MXZ-3C24NAHZ

OBH702A

MXZ-3C30NAHZ

22

7

OBH702A

REFRIGERANT SYSTEM DIAGRAM

MXZ-3C24NA
MXZ-3C30NA

R.V.coil
OFF Refrigerant flow in heating
ON Refrigerant flow in cooling

Union

Union

ĭ1/4

ĭ1/4

ĭ1/4

ĭ1/2

ĭ3/8

ĭ3/8

Strainer
#100

Strainer
#100

Strainer
#100

Indoor unit A

Indoor unit B

Indoor unit C

Indoor unit A

Indoor unit B

Indoor unit C

High pressure switch

Header(Gas)

Capillary tube
O.D.0.16 x I.D.0.11 x 3.94
(Ø4.0 x Ø2.8 x 100)

LEVA

LEVB

LEVC

Compressor

Muffler

Service port

Stop valve
(with service port)

Sub
muffler

Stop valve

Compressor shell
temperature
thermistor
RT62

4-way valve

Strainer
#100

Accumulator

Capillary tube

Service port

Distributor

Header (Evaporator)

Outdoor
heat exchanger

Outdoor
heat exchanger temperature
thermistor
RT68

Defrost
temperature
thermistor

RT61
Strainer
#50

Unit: inch (mm)

Ambient
temperature
thermistor
RT65

23

Operating Range MXZ-3C24NA MXZ-3C30NA

Cooling
Heating

Maximum

Minimum

Maximum

Minimum

Indoor intake air temperature

95°FDB, 71°FWB
67°FDB, 57°FWB
80°FDB, 67°FWB
70°FDB, 60°FWB

Outdoor intake air temperature

115°FDB

14°FDB

75°FDB, 65°FWB

6°FDB, 5°FWB

OBH702A

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

Outdoor

c

unit

Max. height difference

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".

For

Indoor unit A

Indoor unit B

Indoor unit C

49 ft.

Unit : inch

Outdoor unit union diameter

Liquid 1/4

Gas 1/2

Liquid 1/4

Gas 3/8

Liquid 1/4

Gas 3/8

24

MXZ-4C36NA

OBH702A

R.V.coil
OFF Refrigerant flow in heating
ON Refrigerant flow in cooling

Union

Union

ĭ1/4

ĭ1/4

ĭ1/4

ĭ1/4

ĭ1/2

ĭ3/8

ĭ3/8
ĭ3/8

Strainer
#100

Strainer
#100

Strainer
#100

Strainer
#100

Indoor unit A

Indoor unit B

Indoor unit C

Indoor unit D

Indoor unit A

Indoor unit B

Indoor unit C

Indoor unit D

High pressure switch

Header(Gas)

Capillary tube
O.D.0.16 x I.D.0.11 x 3.94
(Ø4.0 x Ø2.8 x 100)

LEV A

LE

LEV C

LEV D

Compressor

Muffler

Service port

Stop valve
(with service port)

Sub
muffler

V B

Stop valve

Compressor shell
temperature
thermistor
RT62

4-way valve

Strainer
#100

Accumulator

Capillary tube

Service port

Distributor

Header (Evaporator)

Outdoor

heat exchanger

Outdoor

heat exchanger

temperature

thermistor

RT68

Defrost
temperature
thermistor
RT61

Strainer
#50

Unit: inch (mm)

Ambient
temperature
thermistor
RT65

25

Operating Range MXZ-4C36NA

Cooling
Heating

Maximum

Minimum

Maximum

Minimum

Indoor intake air temperature

95°FDB, 71°FWB
67°FDB, 57°FWB
80°FDB, 67°FWB
70°FDB, 60°FWB

Outdoor intake air temperature

115°FDB

14°FDB

75°FDB, 65°FWB

6°FDB, 5°FWB

OBH702A

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

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".

a

Max. height difference

b

c

d

Outdoor
unit

49 ft.

Outdoor unit union diameter

For

Indoor unit A

Indoor unit B

Indoor unit C

Indoor unit D

49 ft.

49 ft.

Unit : inch

Liquid 1/4

Gas 1/2

Liquid 1/4

Gas 3/8

Liquid 1/4

Gas 3/8

Liquid 1/4

Gas 3/8

26