Mitsubishi Electric Mr. Slim MXZ-2B20NA User manual

Models
SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
4. NOISE CRITERIA CURVES ······························ 8
5. OUTLINES AND DIMENSIONS ························ 9
6. WIRING DIAGRAM·········································· 12
7. REFRIGERANT SYSTEM DIAGRAM ············· 15
8. DATA································································ 21
9. ACTUATOR CONTROL··································· 39
10. SERVICE FUNCTIONS···································· 39
11. TROUBLESHOOTING ····································· 41
12. DISASSEMBLY INSTRUCTIONS···················· 59
INDOOR UNITS COMBINATION SHEETS
No. OBH560
REVISED EDITION-D
The Slim Line.
From Mitsubishi Electric.
TM
OUTDOOR UNIT
MXZ-2B20NA, - 1
MXZ-3B24NA, - 1
MXZ-3B30NA, - 1
MXZ-4B36NA, - 1
MXZ-2B20NA
Indoor unit service manual
MSZ-A·NA Series (OB450)
MSZ-FD·NA Series (OBH497)
MSZ-FE·NA Series (OBH542)
MSZ-GE·NA Series (OBH548)
MFZ-KA·NA Series(OBH568)
SEZ-KD·NA.TH Series
SPLIT-TYPE AIR CONDITIONERS
HFC
utilized
R410A
33223
9700058
Revision D:
• MXZ-3B24NA-
1
, MXZ-3B30NA-
1
,and MXZ-
4B36NA-
1
have been added.
Please void OBH560
REVISED EDITION-C.
PARTS CATALOG (OBB560)

TECHNICAL CHANGES
2
1
Revision B:
• MXZ-3B24NA and MXZ-4B36NA have been added.
MXZ-2B20NA
New model
MXZ-2B20NA MXZ-2B20NA - 1
1. Outdoor fan motor has been changed.
2. Outdoor electronic control P.C. board has been changed.
3. LEV coil has been changed.
MXZ-3B24NA
New model
MXZ-3B30NA
New model
MXZ-3B24NA MXZ-3B24NA - 1
1. Outdoor fan motor has been changed.
2. Outdoor electronic control P.C. board has been changed.
MXZ-3B30NA MXZ-3B30NA - 1
1. Outdoor fan motor has been changed.
2. Outdoor electronic control P.C. board has been changed.
MXZ-4B36NA MXZ-4B36NA - 1
1. Outdoor fan motor has been changed.
2. Outdoor electronic control P.C. board has been changed.
Revision A:
• MXZ-2B20NA- 1 has been added.
Revision C:
• MXZ-3B30NA has been added.
Revision D:
• MXZ-3B24NA- 1, MXZ-3B30NA- 1, and MXZ-4B36NA- 1have been added.

3
PART NAMES AND FUNCTIONS
2
MXZ-2B20NA
Air outlet
Drain outlet
Air inlet
(Back and side)
MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Air outlet
Drain outlet
Air inlet
(Back and side)

4
SPECIFICATION
3
Item
Outdoor model
Indoor type Non-Duct (09+09) Duct (09+12)
Capacity
Power
consumption
EER
SEER
HSPF IV (V)
COP
External finish
Power supply
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
Compressor
Refrigerant control
Sound level
Defrost method
Dimensions
Weight
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Valve size
Connection method
Refrigerant charge (R410A)
Refrigeration oil (Model)
Model
Winding resistance (at 68°F) Ω
W
D
H
Liquid
Gas
Indoor
Outdoor
Btu/h
Btu/h
Btu/h
W
W
W
V, phase, Hz
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
lb.
in.
in.
lb.
oz.
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
MXZ-2B20NA, -
1
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
20
15
0.96
SNB130FQBH1
U-V 0.98 V-W 0.98 W-U 0.98
10.1
15
LEV
49/51
Reverse cycle
33-1/16
13
27-15/16
130
Wireless type
12-24 V DC
Not supplied (optional parts)
1/4
A,B: 3/8
Flared
Flared
5 lb. 15 oz.
23.7 (NEO22)
18,000
22,000
14,500
1,440
1,650
1,500
12.50
18.0
8.9 (7.0)
3.91
20,000
22,000
12,500
2,190
1,780
1,430
9.10
15.5
8.5 (6.9)
3.62
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
NOTE : Test conditions are based on ARI 210/240.

5
Item
Outdoor model
Indoor type Non-Duct (06+06+09)
MXZ-3B24NA
MXZ-3B24NA -
1
Duct (09+09+09)
Capacity
Power
consumption
EER
SEER
HSPF IV (V)
COP
External finish
Power supply
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
Compressor
Refrigerant control
Sound level
Defrost method
Dimensions
Weight
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Valve size
Connection method
Refrigerant charge (R410A)
Refrigeration oil (Model)
Model
Winding resistance (at 68°F) Ω
W
D
H
Liquid
Gas
Indoor
Outdoor
Btu/h
Btu/h
Btu/h
W
W
W
V, phase, Hz
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
lb.
in.
in.
lb.
oz.
22,000
25,000
18,800
1,760
1,750
2,120
12.50
17.5
9.3 (7.0)
4.20
23,600
24,600
17,000
2,460
1,900
2,230
9.60
15.0
8.5 (6.9)
3.80
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
20
15
18
0.93
TNB220FMCH
U-V 0.61 V-W 0.61 W-U 0.61
11
15
LEV
54/49
Reverse cycle
35-7/16
12-19/32
35-7/16
150
Wireless type
12-24 V DC
Not supplied (optional parts)
1/4
A: 1/2 B,C: 3/8
Flared
Flared
7 lb. 11 oz.
29.4 (NEO22)
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
MXZ-3B24NA, -
1
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
NOTE : Test conditions are based on ARI 210/240.

6
Item
Outdoor model
Indoor type Non-Duct (09+09+12)
MXZ-3B30NA
MXZ-3B30NA -
1
Duct (09+09+12)
Capacity
Power
consumption
EER
SEER
HSPF IV (V)
COP
External finish
Power supply
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
Compressor
Refrigerant control
Sound level
Defrost method
Dimensions
Weight
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Valve size
Connection method
Refrigerant charge (R410A)
Refrigeration oil (Model)
Model
Winding resistance (at 68°F) Ω
W
D
H
Liquid
Gas
Indoor
Outdoor
Btu/h
Btu/h
Btu/h
W
W
W
V, phase, Hz
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
lb.
in.
in.
lb.
oz.
28,400
28,600
18,800
3,120
2,150
2,120
9.10
17.5
10.5 (7.2)
3.90
27,400
27,600
18,000
3,330
2,220
2,140
8.23
14.5
9.5 (7.0)
3.64
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
20
15
18
0.93
TNB220FMCH
U-V 0.61 V-W 0.61 W-U 0.61
11
15
LEV
49/49
Reverse cycle
35-7/16
12-19/32
35-7/16
150
Wireless type
12-24 V DC
Not supplied (optional parts)
1/4
A: 1/2 B,C: 3/8
Flared
Flared
7 lb. 11 oz.
29.4 (NEO22)
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
MXZ-3B30NA, -
1
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
NOTE : Test conditions are based on ARI 210/240.

7
Item
Outdoor model
Indoor type Non-Duct (09+09+09+09)
MXZ-4B36NA
MXZ-4B36NA -
1
Duct (09+09+09+09)
Capacity
Power
consumption
EER
SEER
HSPF IV (V)
COP
External finish
Power supply
Max. fuse size (time delay)
Min. circuit ampacity
Fan motor
Compressor
Refrigerant control
Sound level
Defrost method
Dimensions
Weight
Remote controller
Control voltage (by built-in transformer)
Refrigerant piping
Valve size
Connection method
Refrigerant charge (R410A)
Refrigeration oil (Model)
Model
Winding resistance (at 68°F) Ω
W
D
H
Liquid
Gas
Indoor
Outdoor
Btu/h
Btu/h
Btu/h
W
W
W
V, phase, Hz
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
lb.
in.
in.
lb.
oz.
35,400
36,000
36,000
24,600
3,760
3,020
3,020
3,340
9.40
18.0
9.3 (7.2)
3.50
34,400
34,400
34,400
25,400
3,940
3,100
3,100
3,450
8.70
15.0
9.0(7.0)
3.25
Munsell 3.0Y 7.8/1.1
208/230, 1, 60
20
25
19
23
0.93
TNB220FMCH
U-V 0.61 V-W 0.61 W-U 0.61
14.4
15
LEV
54/57
Reverse cycle
35-7/16
12-19/32
35-7/16
153
Wireless type
12-24 V DC
Not supplied (optional parts)
1/4
A: 1/2 B,C,D: 3/8
Flared
Flared
8 lb. 13 oz.
29.4 (NEO22)
Cooling
Heating 47
Heating 17
Cooling
Heating 47
Heating 17
Cooling
Cooling
Heating
Heating
MXZ-4B36NA, -
1
MXZ-4B36NA
MXZ-4B36NA -
1
208 V
230 V
208 V
230 V
208 V
230 V
208 V
230 V
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
NOTE : Test conditions are based on ARI 210/240.

8
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
49
SPL(dB(A))
51
LINE
NOISE CRITERIA CURVES
4
MXZ-2B20NA
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))
57
LINE
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))
49
LINE
MXZ-4B36NA
MXZ-3B24NA
MXZ-3B30NA
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
49
SPL(dB(A))
49
LINE

9
OUTLINES AND DIMENSIONS
5
MXZ-2B20NA Unit: inch
Lock nut Connector
Grounding terminal
Conduit
cover
Note : Leave front and both sides
free of obstruction.
Note : Leave front and overhead
free of obstruction.
Note : Leave rear, overhead and both sides
free of obstruction.
1.Installation space
2.Service space

10
MXZ-3B24NA
MXZ-3B30NA
Unit: inch
A
B
C
15/16" 7/16"
5/8" 5/8"
1-1/16"
1-9/16"
14"
15-1/4"
10-5/8"
9-27/32"
1-3/8"
19-11/16" 7-7/8"
7-7/8"
2-29/32"
1-3/8"
(Bolt pitch)
Air in
Air out
Air in
2-(15/32" x 1-13/32") Oval hole
2-U Shaped notched hole
(Base bolt M10)
3- 7/8"Punched hole
(Connect wiring hole)
35-7/16"
(Connect wiring hole)
2- 7/8"Knockout
Handle
Handle
8-27/32"
1-25/32"
19-1/8"
12-1/2"
18-1/8"
29/32"
13/32"12-19/32"1-3/16"
3-15/32"
Gas pipe
3/8 (B,C unit)
1/2 (A unit)
More than 3-15/16"
More than 19-11/16"
More than 7-7/8"
More than13-25/32"
More than 3-15/16"
More than 19-11/16"
More than 13-25/32"
More than 13-25/32"
More than 3-15/16"
SERVICE SPACE
More than 3-15/16"
More than 19-11/16"
5-3/16"
Liquid pipe
1/4 flared
35-7/16"
1-3/16"
4-3/4"
(Base bolt M10)
Drain hole 3- 1-5/16"
Note : Leave front and both sides
free of obstruction.
Note : Leave front and overhead
free of obstruction.
Note : Leave rear, overhead and both sides
free of obstruction.
1.Installation space
2.Service space
C unit connection
B unit connection
A unit connection
Conduit cover
Lock nut Connector