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

11
MXZ-4B36NA
A
B
C
D
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
12-13/32"
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,D 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
D unit connection
B unit connection
A unit connection
Conduit cover
Lock nut Connector
Unit: inch

12
WIRING DIAGRAM
6
MXZ-2B20NA
MXZ-2B20NA - 1

13
MXZ-3B24NA
MXZ-3B30NA
MXZ-4B36NA

14
MXZ-3B24NA - 1
MXZ-3B30NA - 1
MXZ-4B36NA - 1

15
Stop valve with
service port
Stop valve
Strainer
#100
Power
receiver
LEV A
LEV B
Oil separator
Compressor
Defrost
thermistor
RT61
Distributor
Muffler
4-way valve
LEV E
Indoor unit
B
Indoor unit
A
Indoor unit
A
Indoor unit
B
Capillary tube
O.D.0.14 x I.D.0.09 x 19.68
Capillary tube
O.D.0.10 x I.D.0.02 x 39.37
Capillary tube
O.D.0.16 x I.D.0.11 x 3.93
Capillary tube
O.D.0.16 x I.D.0.11 x 3.93
Discharge
temperature
thermistor RT62
Strainer
#100
Strainer
#100
R.V. coil
OFF
ON
Refrigerant flow in cooling
Refrigerant flow in heating
Ambient
temperature
thermistor
RT65
Outdoor heat
exchanger
temperature
thermistor
RT68
FAN-OUT
HEX-OUT
Service
port
Service
port
Strainer
#100
REFRIGERANT SYSTEM DIAGRAM
7
Unit: inch
MXZ-2B20NA

16
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, see the appropriate parts catalog, Optional parts "DIFFERENT
DIAMETER PIPE"(2-1.).
Unit: inch
It is irrelevant which unit is higher.
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-2B20NA
Operating Range MXZ-2B20NA
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
a
b
Outdoor
unit
Indoor
units
49 ft.
33 ft.
49 ft.
Max. height difference
Indoor unit class Extension pipe diameter
09 or less Liquid 1/4
Gas 3/8
12 Liquid 1/4
Gas 3/8
15 Liquid 1/4
Gas 1/2
Outdoor unit union diameter
For
Indoor unit A Liquid 1/4
Gas 3/8
Indoor unit B Liquid 1/4
Gas 3/8
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.

17
Stop valve
(with service port)
Stop valve
Power
receiver
LEV A
LEV B
LEV C
Oil separator
Compressor
Muffler
4-way valve
LEV F
Indoor unit
C
Indoor unit
B
Indoor unit
A
Indoor unit
A
Indoor unit
B
Indoor unit
C
Capillary tube
O.D.0.10
x I.D.0.02 x 39.37
Capillary tube
O.D.0.16
x I.D.0.11 x 3.94
Discharge
temperature
thermistor RT62
Service port
Service
port
Strainer
#100
Strainer
#100
Strainer
#100
Strainer
#100
R.V. coil
OFF
ON
Refrigerant flow in cooling
Refrigerant flow in heating
Strainer
#100
Distributor
Outdoor
heat
exchanger
Capillary tube
O.D.0.12
x I.D.0.08 x 11.8
Defrost
thermistor
RT61
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
High-pressure
switch
Unit: inch
MXZ-3B24NA
MXZ-3B30NA

18
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, see the appropriate parts catalog, Optional parts "DIFFERENT
DIAMETER PIPE"(2-1.).
Unit : inch
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.
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-3B24NA MXZ-3B30NA
Operating Range MXZ-3B24NA MXZ-3B30NA
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
a
c
Outdoor
unit
Indoor
units Max. height difference
49 ft.
33 ft.
b49 ft.
Indoor unit class Extension pipe diameter
09 or less Liquid 1/4
Gas 3/8
12 Liquid 1/4
Gas 3/8
15 Liquid 1/4
Gas 1/2
17 Liquid 1/4
Gas 1/2
18 Liquid 1/4
Gas 1/2
24
(MXZ-3B30NA only)
Liquid 1/4
Gas 5/8
Outdoor unit union diameter
For
Indoor unit A Liquid 1/4
Gas 1/2
Indoor unit B Liquid 1/4
Gas 3/8
Indoor unit C Liquid 1/4
Gas 3/8

19
Stop valve
(with service port)
Stop valve
Power
receiver
LEV A
LEV B
LEV C
Oil separator
Compressor
Muffler
4-way valve
LEV F
Indoor unit
C
Indoor unit
B
Indoor unit
A
Indoor unit
A
Indoor unit
B
Indoor unit
C
Capillary tube
O.D.0.10 x I.D.0.02 x 39.37
Capillary tube
O.D.0.16 x I.D.0.11 x 3.94
Discharge
temperature
thermistor RT62
Service port
Service
port
Strainer
#100 Strainer
#100
Strainer
#100
Strainer
#100
R.V. coil
OFF
ON
Refrigerant flow in cooling
Refrigerant flow in heating
Strainer
#100
Distributor
Outdoor
heat
exchanger
Capillary tube
O.D.0.12 x I.D.0.08 x 11.8
Defrost
thermistor
RT61
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
High-pressure
switch
Indoor unit
D
LEV D
Indoor unit
DStrainer
#100
MXZ-4B36NA Unit: inch

20
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, see the appropriate parts catalog, Optional parts "DIFFERENT
DIAMETER PIPE"(2-1.). Unit : inch
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.
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-4B36NA
Operating Range MXZ-4B36NA
a
b
c
d
Outdoor
unit
Indoor
units
49 ft.
33 ft.
49 ft.
Max. height difference
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
Indoor unit class Extension pipe diameter
09 or less Liquid 1/4
Gas 3/8
12 Liquid 1/4
Gas 3/8
15 Liquid 1/4
Gas 1/2
17 Liquid 1/4
Gas 1/2
18 Liquid 1/4
Gas 1/2
24 Liquid 1/4
Gas 5/8
Outdoor unit union diameter
For
Indoor unit A Liquid 1/4
Gas 1/2
Indoor unit B Liquid 1/4
Gas 3/8
Indoor unit C Liquid 1/4
Gas 3/8
Indoor unit D Liquid 1/4
Gas 3/8