outdoor unit service manual hfc
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Models
SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ··································· 22. PART NAMES AND FUNCTIONS ····················· 23. SPECIFICATION ················································ 34. NOISE CRITERIA CURVES ······························ 75. OUTLINES AND DIMENSIONS ························ 86. WIRING DIAGRAM ···········································117. REFRIGERANT SYSTEM DIAGRAM ············· 138. DATA ································································ 19
9. ACTUATOR CONTROL ··································· 3710. SERVICE FUNCTIONS ···································· 3711. TROUBLESHOOTING ····································· 3912. DISASSEMBLY INSTRUCTIONS ···················· 57
INDOOR UNITS COMBINATION SHEETS
No. OBH560REVISED EDITION-C
The Slim Line.From Mitsubishi Electric.
TM
OUTDOOR UNIT
MXZ-2B20NA, - 1
MXZ-3B24NAMXZ-3B30NAMXZ-4B36NA
MXZ-2B20NA
Indoor unit service manualMSZ-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
HFCutilized
R410A
332239700058
Revision C:• MXZ-3B30NA has been added.
Please void OBH560 REVISED EDITION-B.
PARTS CATALOG (OBB560)
TECHNICAL CHANGES
2
1
PART NAMES AND FUNCTIONS2
MXZ-2B20NA
Air outlet
Drain outlet
Air inlet(Back and side)
Revision B:• MXZ-3B24NA and MXZ-4B36NA have been added.
MXZ-2B20NANew 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-3B30NA MXZ-4B36NA
Air outlet
Drain outlet
Air inlet(Back and side)
Revision A:• MXZ-2B20NA- 1 has been added.
Revision C:• MXZ-3B30NA has been added.
3
SPECIFICATION3
ItemOutdoor model
Indoor type Non-Duct (09+09) Duct (09+12)
Capacity
Powerconsumption
EERSEERHSPF IV (V)COPExternal finishPower supplyMax. fuse size (time delay)Min. circuit ampacityFan motor
Compressor
Refrigerant controlSound level Defrost method
Dimensions
WeightRemote controllerControl voltage (by built-in transformer)Refrigerant piping
Valve size
Connection method
Refrigerant charge (R410A)Refrigeration oil (Model)
ModelWinding resistance (at 68°F) Ω
WDH
LiquidGasIndoorOutdoor
Btu/hBtu/hBtu/h
WWW
V, phase, HzAA
F.L.A
R.L.AL.R.A
dB(A)
in.in.in.lb.
in.in.
lb.oz.
CoolingHeating 47Heating 17CoolingHeating 47Heating 17CoolingCoolingHeatingHeating
MXZ-2B20NA
Munsell 3.0Y 7.8/1.1208/230, 1, 60
2015
0.96SNB130FQBH1
U-V 0.98 V-W 0.98 W-U 0.9810.115
LEV49/51
Reverse cycle33-1/16
1327-15/16
130Wireless type12-24 V DC
Not supplied (optional parts)1/4
A,B: 3/8FlaredFlared
5 lb. 15 oz.23.7 (NEO22)
18,00022,00014,5001,4401,6501,50012.5018.0
8.9 (7.0)3.91
20,00022,00012,5002,1901,7801,4309.1015.5
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 speedIntermediate 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 speedHigh temperature heating at minimum compressor speedFrost accumulation at rated compressor speedFrost accumulation at intermediate compressor speed
TestIndoor air condition Outdoor air conditionDry bulb Wet bulb Dry bulb Wet bulb
8080808080707070707070
6767676767606060606060
9582826787471762473535
(75)(65)(65)
(53.5)(69)4315
56.5433333
Unit: °F
NOTE : Test conditions are based on ARI 210/240.
4
Item
Outdoor modelIndoor type Non-Duct (06+06+09) Duct (09+09+09)
Capacity
Powerconsumption
EERSEERHSPF IV (V)COPExternal finishPower supplyMax. fuse size (time delay)Min. circuit ampacityFan motor
Compressor
Refrigerant controlSound level Defrost method
Dimensions
WeightRemote controllerControl voltage (by built-in transformer)Refrigerant piping
Valve size
Connection method
Refrigerant charge (R410A)Refrigeration oil (Model)
ModelWinding resistance (at 68°F) Ω
WDH
LiquidGasIndoorOutdoor
Btu/hBtu/hBtu/h
WWW
V, phase, Hz AA
F.L.A
R.L.AL.R.A
dB(A)
in.in.in.lb.
in.in.
lb.oz.
22,00025,00018,8001,7601,7502,12012.5017.5
9.3 (7.0)4.20
23,60024,60017,0002,4601,9002,2309.6015.0
8.5 (6.9)3.80
Munsell 3.0Y 7.8/1.1208/230, 1, 60
2015
0.93TNB220FMCH
U-V 0.61 V-W 0.61 W-U 0.611115
LEV54/49
Reverse cycle35-7/16
12-19/3235-7/16
150Wireless type12-24 V DC
Not supplied (optional parts)1/4
A: 1/2 B,C: 3/8FlaredFlared
7 lb. 11 oz.29.4 (NEO22)
CoolingHeating 47Heating 17CoolingHeating 47Heating 17CoolingCoolingHeatingHeating
MXZ-3B24NA
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 speedIntermediate 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 speedHigh temperature heating at minimum compressor speedFrost accumulation at rated compressor speedFrost accumulation at intermediate compressor speed
TestIndoor air condition Outdoor air conditionDry bulb Wet bulb Dry bulb Wet bulb
8080808080707070707070
6767676767606060606060
9582826787471762473535
(75)(65)(65)
(53.5)(69)4315
56.5433333
Unit: °F
NOTE : Test conditions are based on ARI 210/240.
5
Item
Outdoor modelIndoor type Non-Duct (06+06+09) Duct (09+09+09)
Capacity
Powerconsumption
EERSEERHSPF IV (V)COPExternal finishPower supplyMax. fuse size (time delay)Min. circuit ampacityFan motor
Compressor
Refrigerant controlSound level Defrost method
Dimensions
WeightRemote controllerControl voltage (by built-in transformer)Refrigerant piping
Valve size
Connection method
Refrigerant charge (R410A)Refrigeration oil (Model)
ModelWinding resistance (at 68°F) Ω
WDH
LiquidGasIndoorOutdoor
Btu/hBtu/hBtu/h
WWW
V, phase, Hz AA
F.L.A
R.L.AL.R.A
dB(A)
in.in.in.lb.
in.in.
lb.oz.
28,40028,60018,8003,1202,1502,1209.1017.5
10.5 (7.2)3.90
27,40027,60018,0003,3302,2202,1408.2314.5
9.5 (7.0)3.64
Munsell 3.0Y 7.8/1.1208/230, 1, 60
2015
0.93TNB220FMCH
U-V 0.61 V-W 0.61 W-U 0.611115
LEV49/49
Reverse cycle35-7/16
12-19/3235-7/16
150Wireless type12-24 V DC
Not supplied (optional parts)1/4
A: 1/2 B,C: 3/8FlaredFlared
7 lb. 11 oz.29.4 (NEO22)
CoolingHeating 47Heating 17CoolingHeating 47Heating 17CoolingCoolingHeatingHeating
MXZ-3B30NA
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 speedIntermediate 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 speedHigh temperature heating at minimum compressor speedFrost accumulation at rated compressor speedFrost accumulation at intermediate compressor speed
TestIndoor air condition Outdoor air conditionDry bulb Wet bulb Dry bulb Wet bulb
8080808080707070707070
6767676767606060606060
9582826787471762473535
(75)(65)(65)
(53.5)(69)4315
56.5433333
Unit: °F
6
Item
Outdoor modelIndoor type Non-Duct (09+09+09+09) Duct (09+09+09+09)
Capacity
Powerconsumption
EERSEERHSPF IV (V)COPExternal finishPower supplyMax. fuse size (time delay)Min. circuit ampacityFan motor
Compressor
Refrigerant controlSound level Defrost method
Dimensions
WeightRemote controllerControl voltage (by built-in transformer)Refrigerant piping
Valve size
Connection method
Refrigerant charge (R410A)Refrigeration oil (Model)
ModelWinding resistance (at 68°F) Ω
WDH
LiquidGasIndoorOutdoor
Btu/h
Btu/h
Btu/hW
W
W
V, phase, Hz AA
F.L.A
R.L.AL.R.A
dB(A)
in.in.in.lb.
in.in.
lb.oz.
35,40036,00036,000
24,6003,7603,0203,0203,3409.4018.0
9.3 (7.2)3.50
34,40034,40034,400
25,4003,9403,1003,1003,4508.7015.0
9.0(7.0)3.25
Munsell 3.0Y 7.8/1.1208/230, 1, 60
2019
0.93TNB220FMCH
U-V 0.61 V-W 0.61 W-U 0.6114.415
LEV54/57
Reverse cycle35-7/1612-19/3235-7/16
153Wireless type12-24 V DC
Not supplied (optional parts)1/4
A: 1/2 B,C,D: 3/8FlaredFlared
8 lb. 13 oz.29.4 (NEO22)
Cooling
Heating 47
Heating 17Cooling
Heating 47
Heating 17CoolingCoolingHeatingHeating
MXZ-4B36NA
208 V230 V
208 V230 V
208 V230 V
208 V230 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 speedIntermediate 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 speedHigh temperature heating at minimum compressor speedFrost accumulation at rated compressor speedFrost accumulation at intermediate compressor speed
TestIndoor air condition Outdoor air conditionDry bulb Wet bulb Dry bulb Wet bulb
8080808080707070707070
6767676767606060606060
9582826787471762473535
(75)(65)(65)
(53.5)(69)4315
56.5433333
Unit: °F
NOTE : Test conditions are based on ARI 210/240.
7
90
80
70
60
50
40
30
20
1063 125 250 500 1000 2000 4000 8000
APPROXIMATETHRESHOLD OFHEARING FORCONTINUOUSNOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OC
TAVE
BA
ND
SO
UN
D P
RES
SUR
E LE
VEL,
0dB
= 0
.000
2 M
ICR
O B
AR
BAND CENTER FREQUENCIES, Hz
CoolingHigh
FUNCTIONFAN SPEED
HeatingHigh
49
SPL(dB(A))
51
LINE
NOISE CRITERIA CURVES4
MXZ-2B20NA
90
80
70
60
50
40
30
20
1063 125 250 500 1000 2000 4000 8000
APPROXIMATETHRESHOLD OFHEARING FORCONTINUOUSNOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OC
TAVE
BA
ND
SO
UN
D P
RES
SUR
E LE
VEL,
0dB
= 0
.000
2 M
ICR
O B
AR
BAND CENTER FREQUENCIES, Hz
CoolingHigh
FUNCTIONFAN SPEED
HeatingHigh
54
SPL(dB(A))
57
LINE
90
80
70
60
50
40
30
20
1063 125 250 500 1000 2000 4000 8000
APPROXIMATETHRESHOLD OFHEARING FORCONTINUOUSNOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OC
TAVE
BA
ND
SO
UN
D P
RES
SUR
E LE
VEL,
0dB
= 0
.000
2 M
ICR
O B
AR
BAND CENTER FREQUENCIES, Hz
CoolingHigh
FUNCTIONFAN SPEED
HeatingHigh
54
SPL(dB(A))
49
LINE
MXZ-4B36NA
MXZ-3B24NA
MXZ-3B30NA
90
80
70
60
50
40
30
20
1063 125 250 500 1000 2000 4000 8000
APPROXIMATETHRESHOLD OFHEARING FORCONTINUOUSNOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OC
TAVE
BA
ND
SO
UN
D P
RES
SUR
E LE
VEL,
0dB
= 0
.000
2 M
ICR
O B
AR
BAND CENTER FREQUENCIES, Hz
CoolingHigh
FUNCTIONFAN SPEED
HeatingHigh
49
SPL(dB(A))
49
LINE
8
OUTLINES AND DIMENSIONS5
MXZ-2B20NA Unit: inch
LIQ 1/4"FLAREGAS 3/8"FLARE
Unit B
Unit A
LIQ
GAS
GAS
LIQ
1-3/16" 1/2"13"
2-5/8"
7-7/8"9-
7/16
"
14-3
/16"
11-3/4"
27-1
5/16
"
1-3/16"33-1/16"
(Bol
t Pitc
h)
3- (1-5/16") Drain Hole
4-(13/32"×13/16") Oval Hole(Foundation Bolt M10)
AirDischarge
Side Air Intake
Rear AirIntake
1-7/
32"
6-21/32"19-11/16"6-9/16"
17/3
2"13
/16"
9-3/16" 11-11/32"
21/3
2"
14-3
/16"
2-1/2"
15-1
9/32
"
11/1
6"11
/16"
3- 7/8" Punched holes(Connecting wire hole)
2-3/
8"
1-3/
16"
14-1
/4"
5-5/
16"
3-5/
16"
1-25
/32"
29/32"
1-5/32"
More than 3-15/16"
Mor
e th
an 1
9-11
/16"
Mor
e th
an 7
-7/8
"
More than13-25/32"
Mor
e th
an 3
-15/
16"
Mor
e th
an 1
9-11
/16"
More than 13-25/32"More than 13-25/32"
More than 3-15/16"SERVICE SPACE
More than 3-15/16"
Mor
e th
an 1
9-11
/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
Lock nut Connector
Grounding terminalConduitcover
9
MXZ-3B24NAMXZ-3B30NA
Unit: inch
A
B
C
15/1
6"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-
29/3
2"
1-3/
8"
(Bol
t pitc
h)
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
Handle8-
27/3
2"
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"
Mor
e th
an 1
9-11
/16"
Mor
e th
an 7
-7/8
"
More than13-25/32"
Mor
e th
an 3
-15/
16"
Mor
e th
an 1
9-11
/16"
More than 13-25/32"More than 13-25/32"
More than 3-15/16"SERVICE SPACE
More than 3-15/16"
Mor
e th
an 1
9-11
/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 sidesfree of obstruction.
Note : Leave front and overheadfree of obstruction.
Note : Leave rear, overhead and both sidesfree of obstruction.
1.Installation space
2.Service space
C unit connectionB unit connectionA unit connection
Conduit coverLock nut Connector
10
MXZ-4B36NA
A
B
C
D
15/1
6"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"
(Bol
t pitc
h)
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
12-1
3/32
"
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"
Mor
e th
an 1
9-11
/16"
Mor
e th
an 7
-7/8
"
More than13-25/32"
Mor
e th
an 3
-15/
16"
Mor
e th
an 1
9-11
/16"
More than 13-25/32"More than 13-25/32"
More than 3-15/16"SERVICE SPACE
More than 3-15/16"
Mor
e th
an 1
9-11
/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 sidesfree of obstruction.
Note : Leave front and overheadfree of obstruction.
Note : Leave rear, overhead and both sidesfree of obstruction.
1.Installation space
2.Service space
C unit connectionD unit connection
B unit connectionA unit connection
Conduit coverLock nut Connector
Unit: inch
11
WIRING DIAGRAM6
MXZ-2B20NA
MXZ-2B20NA - 1
12
MXZ-3B24NAMXZ-3B30NA
MXZ-4B36NA
13
Stop valve withservice port
Stop valveStrainer#100
Powerreceiver
LEV A
LEV B
Oil separator
Compressor
DefrostthermistorRT61
Distributor
Muffler
4-way valve
LEV E
Indoor unitB
Indoor unitA
Indoor unitA
Indoor unitB
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 tubeO.D.0.16 x I.D.0.11 x 3.93
Capillary tubeO.D.0.16 x I.D.0.11 x 3.93
Dischargetemperaturethermistor RT62
Strainer#100
Strainer#100
R.V. coilOFFON
Refrigerant flow in coolingRefrigerant flow in heating
AmbienttemperaturethermistorRT65
Outdoor heatexchangertemperaturethermistorRT68
FAN-OUT
HE
X-O
UT
Serviceport
Serviceport
Strainer#100
REFRIGERANT SYSTEM DIAGRAM7
Unit: inchMXZ-2B20NA
14
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 SELECTIONMXZ-2B20NA
Operating Range MXZ-2B20NA
Cooling
Heating
MaximumMinimumMaximumMinimum
Indoor intake air temperature95°FDB, 71°FWB67°FDB, 57°FWB80°FDB, 67°FWB70°FDB, 60°FWB
Outdoor intake air temperature115°FDB14°FDB
75°FDB, 65°FWB6°FDB, 5°FWB
a
b
Outdoorunit
Indoorunits
49 ft.
33 ft.
49 ft.
Max. height difference
Indoor unit class Extension pipe diameter
09 or less Liquid 1/4Gas 3/8
12 Liquid 1/4Gas 3/8
15 Liquid 1/4Gas 1/2
Outdoor unit union diameterFor
Indoor unit A Liquid 1/4Gas 3/8
Indoor unit B Liquid 1/4Gas 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.
15
Stop valve (with service port)
Stop valve
Powerreceiver
LEV A
LEV B
LEV C
Oil separator
Compressor
Muffler
4-way valve
LEV F
Indoor unitC
Indoor unitB
Indoor unitA
Indoor unitA
Indoor unitB
Indoor unitC
Capillary tube O.D.0.10 x I.D.0.02 x 39.37
Capillary tubeO.D.0.16 x I.D.0.11 x 3.94
Dischargetemperaturethermistor RT62
Service port
Serviceport
Strainer#100
Strainer#100
Strainer#100
Strainer#100
R.V. coil OFF ON
Refrigerant flow in coolingRefrigerant flow in heating
Strainer#100 Distributor
Outdoorheatexchanger
Capillary tube O.D.0.12 x I.D.0.08 x 11.8
DefrostthermistorRT61
Outdoor heat exchangertemperaturethermistorRT68
AmbienttemperaturethermistorRT65
High-pressureswitch
Unit: inchMXZ-3B24NAMXZ-3B30NA
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
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 SELECTIONMXZ-3B24NA MXZ-3B30NA
Operating Range MXZ-3B24NA MXZ-3B30NA
Cooling
Heating
MaximumMinimumMaximumMinimum
Indoor intake air temperature95°FDB, 71°FWB67°FDB, 57°FWB80°FDB, 67°FWB70°FDB, 60°FWB
Outdoor intake air temperature115°FDB14°FDB
75°FDB, 65°FWB6°FDB, 5°FWB
a
c
Outdoorunit
Indoorunits
Max. height difference
49 ft.
33 ft.
b 49 ft.
Indoor unit class Extension pipe diameter
09 or lessLiquid 1/4Gas 3/8
12Liquid 1/4Gas 3/8
15Liquid 1/4Gas 1/2
17Liquid 1/4Gas 1/2
18Liquid 1/4Gas 1/2
24 (MXZ-3B30NA only)Liquid 1/4Gas 5/8
Outdoor unit union diameterFor
Indoor unit ALiquid 1/4Gas 1/2
Indoor unit BLiquid 1/4Gas 3/8
Indoor unit CLiquid 1/4Gas 3/8
17
Stop valve (with service port)
Stop valve
Powerreceiver
LEV A
LEV B
LEV C
Oil separator
Compressor
Muffler
4-way valve
LEV F
Indoor unitC
Indoor unitB
Indoor unitA
Indoor unitA
Indoor unitB
Indoor unitC
Capillary tube O.D.0.10 x I.D.0.02 x 39.37
Capillary tubeO.D.0.16 x I.D.0.11 x 3.94
Dischargetemperaturethermistor RT62
Service port
Serviceport
Strainer#100
Strainer#100
Strainer#100
Strainer#100
R.V. coil OFF ON
Refrigerant flow in coolingRefrigerant flow in heating
Strainer#100 Distributor
Outdoorheatexchanger
Capillary tube O.D.0.12 x I.D.0.08 x 11.8
DefrostthermistorRT61
Outdoor heat exchangertemperaturethermistorRT68
AmbienttemperaturethermistorRT65
High-pressureswitch
Indoor unitD
LEV DIndoor unit
D Strainer#100
MXZ-4B36NA Unit: inch
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, 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 SELECTIONMXZ-4B36NA
Operating Range MXZ-4B36NA
a
b
c
d
Outdoorunit
Indoorunits
49 ft.
33 ft.
49 ft.
Max. height difference
Cooling
Heating
MaximumMinimumMaximumMinimum
Indoor intake air temperature95°FDB, 71°FWB67°FDB, 57°FWB80°FDB, 67°FWB70°FDB, 60°FWB
Outdoor intake air temperature115°FDB14°FDB
75°FDB, 65°FWB6°FDB, 5°FWB
Indoor unit class Extension pipe diameter
09 or lessLiquid 1/4Gas 3/8
12Liquid 1/4Gas 3/8
15Liquid 1/4Gas 1/2
17Liquid 1/4Gas 1/2
18Liquid 1/4Gas 1/2
24Liquid 1/4Gas 5/8
Outdoor unit union diameterFor
Indoor unit ALiquid 1/4Gas 1/2
Indoor unit BLiquid 1/4Gas 3/8
Indoor unit CLiquid 1/4Gas 3/8
Indoor unit DLiquid 1/4Gas 3/8
19
DATA8
Model MXZ-2B20NAIndoor type Non-Duct (09+09) Duct (09+12)Item Unit Cooling Heating Cooling HeatingTotal Capacity But/h 18,000 22,000 20,000 22,000
SHF – – – – –Input kW 1.44 1.65 2.19 1.78
Electricalcircuit
Power supply (V,phase,Hz) 208/230, 1, 60Input kW 1.396 1.604 2.06 1.69Comp. current (208/230V) A 6.08/5.87 7.25/6.80 9.81/8.87 7.98/7.22Fan motor current A 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39
Refrigerantcircuit
Condensing pressure PSIG 411 319 417 350Suction pressure PSIG 141 102 130 101Discharge temperature ºF 169 154 174 172Condensing temperature ºF 114 100 120 104Suction temperature ºF 71 46 65 46Comp. shell bottom temp. ºF 163 149 185 167Ref. pipe length[Total pipe length for multi-system] ft 25 [50]
Refrigerant charge (R410A) – 5 lb. 15 oz.Outdoorunit
Intake air temperature DB ºF 95 47 95 47WB ºF – 43 – 43
Fan speed rpm 650 700 650 700Airfl ow CFM 1485 1640 1485 1640
Model MXZ-3B24NAIndoor type Non-Duct (06+06+09) Duct (09+09+09)Item Unit Cooling Heating Cooling HeatingTotal Capacity But/h 22,000 25,000 23,600 24,600
SHF – – – – –Input kW 1.76 1.75 2.46 1.9
Electricalcircuit
Outdoor unit MXZ-3B24NAPower supply (V,phase,Hz) 208/230,1,60Input kW 1.694 1.681 2.28 1.78Comp. current (208/230V) A 8.00/7.23 7.94/7.18 10.90/9.86 8.43/7.62Fan motor current A 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39
Refrigerantcircuit
Condensing pressure PSIG 394 296 408 324Suction pressure PSIG 158 98 139 100Discharge temperature ºF 173 153 167 164Condensing temperature ºF 115 93 117 99Suction temperature ºF 79 47 58 49Comp. shell bottom temp. ºF 159 134 153 144Ref. pipe length[Total pipe length for multi-system] ft 25[75]
Refrigerant charge (R410A) – 7 lb.11 oz.Outdoorunit
Intake air temperature DB ºF 95 47 95 47WB ºF – 43 – 43
Fan speed rpm 750 600 750 600Airfl ow CFM 2,068 1,605 2,068 1,605
20
Model MXZ-4B36NAIndoor type Non-Duct (09+09+09+09) Duct (09+09+09+09)Item Unit Cooling Heating Cooling HeatingTotal Capacity But/h 35,400 36,000 34,400 34,400
SHF – – – – –Input kW 3.76 3.02 3.94 3.1
Electricalcircuit
Outdoor unit MXZ-4B36NAPower supply (V,phase,Hz) 208/230,1,60Input kW 3.672 2.928 3.62 2.86Comp. current (208/230V) A 17.44/15.78 13.83/12.51 17.58/15.90 13.39/12.56Fan motor current A 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39
Refrigerantcircuit
Condensing pressure PSIG 485 309 455 347Suction pressure PSIG 142 91 130 95Discharge temperature ºF 198 139 202 163Condensing temperature ºF 129 95 126 102Suction temperature ºF 66 28 65 32Comp. shell bottom temp. ºF 184 127 186 148Ref. pipe length[Total pipe length for multi-system] ft 25[100]
Refrigerant charge (R410A) – 8 lb.13 oz.Outdoorunit
Intake air temperature DB ºF 95 47 95 47WB ºF – 43 – 43
Fan speed rpm 750 750 750 750Airfl ow CFM 2,068 2,068 2,068 2,068
Model MXZ-3B30NAIndoor type Non-Duct (09+09+12) Duct (09+09+09)Item Unit Cooling Heating Cooling HeatingTotal Capacity But/h 28,400 28,600 27,400 27,600
SHF – – – – –Input kW 3.12 2.15 3.33 2.22
Electricalcircuit
Outdoor unit MXZ-3B30NAPower supply (V,phase,Hz) 208/230,1,60Input kW 3.047 2.081 3.14 2.09Comp. current (208/230V) A 14.71/13.30 9.92/8.97 15.17/13.72 10.36/9.37Fan motor current A 0.43/0.39 0.43/0.39 0.43/0.39 0.43/0.39
Refrigerantcircuit
Condensing pressure PSIG 489 313 496 325Suction pressure PSIG 145 94 137 100Discharge temperature ºF 208 155 203 168Condensing temperature ºF 130 97 133 99Suction temperature ºF 77 40 63 50Comp. shell bottom temp. ºF 186 136 188 152Ref. pipe length[Total pipe length for multi-system] ft 25[75]
Refrigerant charge (R410A) – 7 lb.11 oz.Outdoorunit
Intake air temperature DB ºF 95 47 95 47WB ºF – 43 – 43
Fan speed rpm 520 600 520 600Airfl ow CFM 1,365 1,605 1,365 1,605
21
(2) OPERATION
Function
Cooling
Heating
"A" Cooling steady stateat rated compressor speed "B-2" Cooling steady state at rated compressor speed"B-1" Cooling steady state at minimum compressor speedLow ambient cooling steady state at minimum compressor speedIntermediate cooling steady state at intermediate compressor speedStandard rating-heating at rated compressor speedLow temperature heatingat rated compressor speedMax. temperature heatingat minimum compressor speedHigh temperature heating at minimum compressor speedFrost accumulationat rated compressor speedFrost accumulationat intermediate compressor speed
DB (°F)
80
80
80
80
80
70
70
70
70
70
70
WB (°F)
67
67
67
67
67
60
60
60
60
60
60
Indoor
DB (°F)
95
82
82
67
87
47
17
62
47
35
35
WB (°F)
(75)
(65)
(65)
(53.5)
(69)
43
15
56.5
43
33
33
Outdoor
Condition
Intake air temperature
8-1. OPERATING RANGE(1) POWER SUPPLY
Outdoor unit
Rating
208/230 V 60 Hz 1
Guaranteed VoltageModel
Min. 198 V Max. 253 V208 V 230 VMXZ-2B20NAMXZ-3B24NAMXZ-3B30NAMXZ-4B36NA
22
MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NAThe 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 pro-vided 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 : °FWB (2) Indoor outlet air wet-bulb temperature : °FWB (3) Outdoor intake air dry-bulb temperature : °FDB (4) Total input: W (5) Indoor intake air dry-bulb temperature : °FDB (6) Outdoor intake air wet-bulb temperature : °FWB (7) Total input : W
Indoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.
}}
Cooling
Heating
How to measure the indoor air wet-bulb/dry-bulb temperature difference1. 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.
2. 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.3. Check that the air filter is cleaned.4. Open windows and doors of room.5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.6. Compressor starts running at 33 Hz (COOL) or 45 Hz (HEAT). The frequency at each operation mode is fixed.7. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.8. 10 minutes later, measure temperature again and check that the temperature does not change.
INDOOR UNIT OUTDOOR UNIT
Wet-and dry-bulbthermometers
Wet-and dry-bulbthermometers
23
09 c
lass
(47H
z)
12 c
lass
(59H
z)
15 c
lass
(78H
z)
Indo
or u
nit c
lass
(Inve
rter
out
put
freq
uenc
y)In
door
air
DB
tem
pera
ture
diffe
renc
e (d
egre
e)
22.120.518.717.115.313.711.910.3
8.56.8
32.830.227.725.222.720.217.615.112.610.1
40.937.634.631.328.325.022.018.915.712.6
06 c
lass
(31H
z)
47.543.740.136.532.829.225.622.018.214.6
Outdoor intake air Wet-bulb temperature (°F) 5 14 23 32 41 50 59
0.40.50.60.70.80.91.01.11.21.3
Heating capacity (at Rated frequency)
Cap
acity
cor
rect
ion
fact
or
596879
Outdoor intake air Wet-bulb temperature (°F) 5 14 23 32 41 50 59
0.40.50.60.70.80.91.01.11.21.3
Total input (Heating : at Rated frequency)
Inpu
t cor
rect
ion
fact
or
596879
Indoor intake air D
ry-bulb temperature (°F)
Indoor intake air Dry-bulb temperature (°F)
NOTE: The above broken lines are for the heating operation without any frost and defrost operation.
0.8
0.9
1.0
1.1
1.2
1.3
14 23 32 41 50 59 68 77 86 95 104 113
Outdoor intake air Dry-bulb temperature (°F)
Inpu
t cor
rect
ion
fact
ors
79 75 726864
Indoor intake air Wet-bulbtemperature( F)
Total input (Cooling : at Rated frequency)
09 c
lass
(35H
z)
15 c
lass
(69H
z)
12 c
lass
(50H
z)
Indo
or u
nit c
lass
(Inve
rter
out
put
freq
uenc
y)In
door
air
WB
tem
pera
ture
diffe
renc
e (d
egre
e)
7.2
6.7
6.1
5.6
5.0
4.7
4.1
11.2
10.3
9.5
8.6
7.9
7.0
6.3
13.5
12.4
11.5
10.4
9.5
8.6
7.6
06 c
lass
(25H
z)
14.4
13.1
12.1
11.2
10.1
9.0
8.1
Cooling capacity (at Rated frequency)
0.9
1.0
1.1
1.2
1.3
1.4
1.5
14 23 32 41 50 59 68 77 86 95 104 113
Outdoor intake air Dry-bulb temperature(°F)
Cap
acity
cor
rect
ion
fact
ors
79
75
6864
72
Indoor intake air Wet-bulbtemperature(°F)
8-2. CAPACITY AND THE INPUT CURVES MXZ-2B20NA
24
06 c
lass
(15H
z)
*24
clas
s(5
6Hz)
18 c
lass
(49H
z)
15 c
lass
(33H
z)
12 c
lass
(29H
z)
Indo
or u
nit c
lass
(Inve
rter
out
put
freq
uenc
y)In
door
air
WB
tem
pera
ture
diffe
renc
e (d
egre
e)
09 c
lass
(20H
z)
11.2
10.3
9.5
8.6
7.9
7.0
6.3
7.7
7.2
6.7
6.1
5.6
5.0
4.5
13.5
12.4
11.5
10.4
9.5
8.6
7.6
13.1
12.2
11.2
10.3
9.4
8.5
7.6
19.3
17.8
16.2
14.8
13.3
12.1
10.6
16.7
15.5
14.2
13.0
11.7
10.6
9.4
Cooling capacity (at Rated frequency)
0.9
1.0
1.1
1.2
1.3
1.4
1.5
14 23 32 41 50 59 68 77 86 95 104 113
Outdoor intake air Dry-bulb temperature(°F)
Cap
acity
cor
rect
ion
fact
ors
79
75
6864
72
Indoor intake air Wet-bulbtemperature(°F)
MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
0.8
0.9
1.0
1.1
1.2
1.3
14 23 32 41 50 59 68 77 86 95 104 113
Outdoor intake air Dry-bulb temperature (°F)
79 75 726864
Inpu
t cor
rect
ion
fact
ors
Indoor intake air Wet-bulbtemperature( F)
Total input (Cooling : at Rated frequency)
09 c
lass
(26H
z)
12 c
lass
(32H
z)
15 c
lass
(44H
z)
*24
clas
s(7
2Hz)
18 c
lass
(50H
z)
Indo
or u
nit c
lass
(Inve
rter
out
put
freq
uenc
y)In
door
air
DB
tem
pera
ture
diffe
renc
e (d
egre
e)
47.343.740.136.432.829.225.621.818.214.6
51.547.543.639.635.631.727.723.819.815.8
32.830.227.725.222.720.217.615.112.610.1
23.421.619.818.016.214.412.610.8
9.07.2
43.240.036.533.329.926.623.220.016.613.3
47.543.740.136.532.829.225.622.018.214.6
06 c
lass
(18H
z) Outdoor intake air Wet-bulb temperature (°F) 5 14 23 32 41 50 59
0.40.50.60.70.80.91.01.11.21.3
Heating capacity (at Rated frequency)
Cap
acity
cor
rect
ion
fact
or
5968
779
Outdoor intake air Wet-bulb temperature (°F) 5 14 23 32 41 50 59
0.40.50.60.70.80.91.01.11.21.3
Total input (Heating : at Rated frequency)
Inpu
t cor
rect
ion
fact
or
596879
Indoor intake air D
ry-bulb temperature (°F)
Indoor intake air Dry-bulb temperature (°F)
* MXZ-3B30/4B36NA only
NOTE: The above broken lines are for the heating operation without any frost and defrost operation.
25
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
Frequency
<HEAT>Total input
Hz
<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
Frequency
<HEAT>Total input
Hz
<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
Frequency
<HEAT>Total input
Hz
2. 09-class unit in single operation
3. 12-class unit in single operation
4. 15-class unit in single operation
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100 0 50 100
1.0
1.5
2.0
2.5<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
Frequency
<HEAT>Total input
Hz
1. 06-class unit in single operation
0.5
1.0
1.5
2.0
2.5
0.5
8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-2B20NA)
26
(OUTDOOR UNIT: MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
0.5
1.0
1.5
2.0
0 50 100
1.0
1.5
2.0
2.5
Frequency
<HEAT>Total input
Hz
0.5
<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
Frequency
<HEAT>Total input
Hz
<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
Frequency
<HEAT>Total input
Hz
<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
Frequency
<HEAT>Total input
Hz
2. 09-class unit in single operation
<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
1. 06-class unit in single operation
3. 12-class unit in single operation
4. 15-class unit in single operation
5. 18-class unit in single operation<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input <HEAT>Capacity
Frequency Frequency
<HEAT>Total input
6. 24-class unit in single operation (MXZ-3B30/4B36NA only)<COOL>Capacity
FrequencyHz
Frequency
<COOL>Total input
Hz
<HEAT>Capacity
FrequencyHz
Frequency
<HEAT>Total input
Hz
0 50 100
0.5
1.0
1.5
2.0
Hz0 50 100
0.5
1.0
1.5
2.0
Hz0 50 100
0.5
1.0
1.5
2.0
Hz0 50 100
0.5
1.0
1.5
2.0
27
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA)(1) COOL operation
Data is based on the condition of indoor humidity 50%
Air flow speed: High Inverter output frequency: 40 Hz
65 70 75 80 85 90 95 100 105 110 115 120
130
140
150
160
170
Ambient temperature (°F)
(°F)
86
80
75
70
Indoor DB temperature (°F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (°F)
(°F)
(°F)15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (°F)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
48 Hz
(PSIG)
40 Hz
40 Hz
65
7570
86807570Indoor DB temperature (°F)
Indoor DB temperature (°F)
<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 40 Hz (COOL) or 48 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.
(2) HEAT operation Data is based on the condition of indoor humidity 75%
Set air flow to High speed. Inverter output frequency is 48 Hz.
28
2. 09-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA)(1) COOL operation
Data is based on the condition of indoor humidity 50%
Air flow speed: High Inverter output frequency: 40 Hz
(2) HEAT operation
65 70 75 80 85 90 95 100 105 110 115 120
130
140
150
160
170
Ambient temperature (°F)
(°F)
86
80
75
70
Indoor DB temperature (°F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (°F)
(°F)
(°F)15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (°F)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
48 Hz
(PSIG)
40 Hz
40 Hz
65
7570
86807570Indoor DB temperature (°F)
Indoor DB temperature (°F)
<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 40 Hz (COOL) or 48 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.
Data is based on the condition of indoor humidity 75%
Set air flow to High speed. Inverter output frequency is 48 Hz.
29
3. 12-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA)(1) COOL operation
65 70 75 80 85 90 95 100 105 110 115120
140
150
160
170
130
Ambient temperature (˚F)
(˚F)
86
80
75
70
86807570
15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (˚F)
(˚F)
(˚F)
(PSIG)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
48 Hz
40 Hz
40 Hz
657075
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Data is based on the condition of indoor humidity 50%
Air flow speed: High Inverter output frequency: 40 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 40 Hz (COOL) or 48 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.
(2) HEAT operation Data is based on the condition of indoor humidity 75%
Set air flow to High speed. Inverter output frequency is 48 Hz.
30
4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA)(1) COOL operation
65 70 75 80 85 90 95 100 105 110 115120
130
140
150
160
170
Ambient temperature (˚F)
(˚F)
86
80
75
70
86807570
15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (˚F)
(˚F)
(˚F)
(PSIG)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
48 Hz
40 Hz
40 Hz
657075
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Data is based on the condition of indoor humidity 50%
Air flow speed: High Inverter output frequency: 40 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 40 Hz (COOL) or 48 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.
(2) HEAT operation Data is based on the condition of indoor humidity 75%
Set air flow to High speed. Inverter output frequency is 48 Hz.
31
5. 06-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operation
Data is based on the condition of indoor humidity 50%
Air flow speed : HighInverter output frequency : 24 Hz
(2) HEAT operation
<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.
65 70 75 80 85 90 95 100 105 110 115110
120
130
140
150
160
Ambient temperature (˚F)
(˚F)
86
80
75
70
Indoor DB temperature (˚F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (˚F)
(˚F)
(˚F)15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
32 Hz
(PSIG)
24 Hz
24 Hz
65
7570
86807570Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Data is based on the condition of outdoor humidity 75%.
Set air flow to High speed. Inverter output frequency is 32 Hz.
32
6. 09-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operation
Data is based on the condition of indoor humidity 50%
Air flow speed : HighInverter output frequency : 24 Hz
65 70 75 80 85 90 95 100 105 110 115110
120
130
140
150
160
Ambient temperature (˚F)
(˚F)
86
80
75
70
Indoor DB temperature (˚F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (˚F)
(˚F)
(˚F)15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
32 Hz
(PSIG)
24 Hz
24 Hz
65
7570
86807570Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
(2) HEAT operationData is based on the condition of outdoor
humidity 75%.Set air flow to High speed. Inverter output frequency is 32 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.
33
7. 12-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operation
65 70 75 80 85 90 95 100 105 110 115110
120
130
140
150
160
Ambient temperature (˚F)
(˚F)
86
80
75
70
86807570
15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (˚F)
(˚F)
(˚F)
(PSIG)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
32 Hz
24 Hz
24 Hz
657075
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Air flow speed : HighInverter output frequency : 24 Hz
(2) HEAT operation
Data is based on the condition of indoor humidity 50%
Data is based on the condition of outdoor humidity 75%.
Set air flow to High speed. Inverter output frequency is 32 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.
34
8. 15-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operation
65 70 75 80 85 90 95 100 105 110 115120
130
140
150
160
170
Ambient temperature (˚F)
(˚F)
86
80
75
70
86807570
15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (˚F)
(˚F)
(˚F)
(PSIG)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
32 Hz
24 Hz
24 Hz
657075
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
(2) HEAT operationData is based on the condition of outdoor
humidity 75%Set air flow to High speed. Inverter output frequency is 32 Hz.
Air flow speed : HighInverter output frequency : 24 Hz
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 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.
35
9. 18-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operation
(2) HEAT operation
65 70 75 80 85 90 95 100 105 110 115120
130
140
150
160
170
Ambient temperature (˚F)
(˚F)
86
80
75
70
86807570
15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
65 70 75 80 85 90 95 100 105 110 1150.0
1.0
2.0
3.0
4.0
5.0
6.0
Ambient temperature (˚F)
(˚F)
(˚F)
(PSIG)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
32 Hz
24 Hz
24 Hz
657075
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Data is based on the condition of outdoor humidity 75%.
Set air flow to High speed. Inverter output frequency is 32 Hz.
Air flow speed : HighInverter output frequency : 24 Hz
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 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.
36
10. 24-class unit in single operation (OUTDOOR UNIT : MXZ-4B36NA)(1) COOL operation
65 70 75 80 85 90 95 100 105 110 115130
140
150
160
170
180
Ambient temperature (˚F)
(˚F)
15 20 25 30 35 40 45 50 55 60 65 70 752.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
65 70 75 80 85 90 95 100 105 110 1151.0
2.0
3.0
4.0
5.0
6.0
7.0
Ambient temperature (˚F)
(˚F)
(˚F)
(PSIG)
Out
door
low
pre
ssur
e
Out
door
uni
t cur
rent
(A)
Out
door
uni
t cur
rent
(A)
32 Hz
24 Hz
24 Hz
86807570
757065
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
Indoor DB temperature (˚F)
86
80
75
70
(2) HEAT operationData is based on the condition of outdoor
humidity 75%Set air flow to High speed. Inverter output frequency is 32 Hz.
Air flow speed : HighInverter output frequency : 24 Hz
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 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.
37
SERVICE FUNCTIONS10
ACTUATOR CONTROL9
Relation between main sensor and actuatorMXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Discharge temperature thermistor
Indoor coil thermistor
Defrost thermistorFin temperature thermistor
Ambient temperature thermistor
Outdoor heat exchanger temperature
Capacity code
Purpose
Protection
Defrosting Protection
DefrostingProtection
Control
Protection
Control
Compressor LEV Outdoorfan motor
4-wayvalve
SensorActuator
10-1. PRE-HEAT CONTROLIf 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 4th Dip Switch of SW1 on the outdoor electronic control P.C. board to ON to deactivate pre-heat control func-tion.
Set the 4th Dip Switch of SW2 on the outdoor electronic control P.C. board to ON to deactivate pre-heat control func-tion (MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA).
ONSW1
1 2 3 4
ON
1 2 3 4
SW1 MXZ-2B20NA
Turn ON the power supply for the air conditioner.
NOTE: Pre-heat control will be turned OFF when the breaker is turned OFF.
ONSW2
1 2 3 4 5 6
ONSW2
1 2 3 4 5 6
MXZ-3B24NAMXZ-3B30NA MXZ-4B36NA
SW2SW1
SW871
38
10-2. AUTO LINE CORRECTING <MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA>Outdoor unit has an auto line correcting function which automaticallydetects 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 15 minutes.
[How to activate this function]
1. Check that outside temperature is above 32˚F. (This function does not work when outside temperature is not above 32˚F.) 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 electronic control P.C. board. Do not touch energized parts.
6. Press the switch to cancel.
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.
SW871
Make sure that the valves are open and the pipes are not collapsed or clogged.
LED indication after cancel :
LED1 (Red)Lighting
LED indication during detection:
LED indication after detection:
LED2 (Yellow)Lighting
LED3 (Green)Blinking
LED1 (Red)Lighting
LED2 (Yellow)Lighting
LED3 (Green)Goes out
LED1 (Red)LightingBlinking
LED2 (Yellow)Goes outBlinking
Other indications
LED3 (Green)LightingBlinking
Completed (Detected successfully)Cannot be correctedRefer to "SAFETY PRECAUTIONS WHEN LED FLASHES"located behind the service panel.
Indication
SW871
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:
NOTE : Activate this function to confirm the correct wiring after replacing the electronic control P.C. board. (Previous records are deleted when the electronic 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").
LED1 (Red)Once
3 times
LED2 (Yellow)Once
3 times
LED3 (Green)LightingLighting
Not correctedCorrected
Number of blinks Wiring line
The record of auto line correcting can be confirmed in the following way:
39
11
3. Troubleshooting procedure1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.2) If the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the com-
ponents for bursting and discoloration.3) When troubleshooting, refer to 11-2, 11-3 and 11-4.
Lead wiring Housing point
11-1. CAUTIONS ON TROUBLESHOOTING1. Before troubleshooting, check the following:
1) Check the power supply voltage.2) Check the indoor/outdoor connecting wire for mis-wiring.
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 confirm-
ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.3) When removing the electrical parts, be careful 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 housing of the connector. DO NOT pull the lead wires.
MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
11-2. FAILURE MODE RECALL FUNCTIONThis 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 detailscan be recalled.This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
1. Type of failure mode recall functionThere are 2 types in failure mode recall function as shown below.
Indoor and outdoor unit failure mode recall function With this function, failure mode of indoor unit and a part of failure mode of outdoor unit can be recalled.
The details of outdoor unit failure mode recall function With this function, more detailed failure mode of outdoor unit can be recalled.
Refer to the service manual of indoor unit for how to recall the failure mode and the details of indoor unit failure mode.The outdoor unit failure mode is indicated by the operation indicator lamp on the indoor unit and the LED of outdoor unit.See "11-2.2. Outdoor unit failure mode table".
TROUBLESHOOTING
40
The left lamp of OPERATION INDICATOR
lamp (Indoor unit)
OFF2-time flash
3-time flash
4-time flash
5-time flash
6-time flash
7-time flash
8-time flash
Lighting LightingLighting Lighting
Lighting Once
Lighting OnceLighting TwiceLighting 3 timesLighting 4 times
Lighting 9 times
Once Goes out
Lighting Lighting
Lighting Lighting
3 times Goesout
4 times Goesout
Lighting Lighting
Lighting Lighting
Lighting 5 times9-time flash
10-time flash
• Replace the outdoor electronic control P.C. board.
• Replace the outdoor electronic control P.C. board.
•Check refrigerant circuit and refrigerant amount.• Refer to 11-6. "Check of LEV".
• Reconnect compressor connector.• Refer to 11-6. "How to check inverter/ compressor".• Check the stop valve.
•Check refrigerant circuit and refrigerant amount.• Check the stop valve.
• Refer to 11-6. "Check of outdoor fan motor".
•Check refrigerant circuit and refrigerant amount.• Refer to 11-6. "Check of LEV".
• Check around outdoor unit.• Check outdoor unit air passage.• Refer to 11-6. "Check of outdoor fan motor".
• 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".
When overcurrent protection stop is continuously performed three times within 1 minute after the compressor gets started, or when converterprotection stop or bus-bar voltageprotection stop is continuouslyperformed three times within 3minutes after start-up.
When thermistor shorts or opens during compressor running.
When 28A current flows into intelligentpower module.
When discharge temperature exceeds 240.8°F during operation. Compressor can restart if dischargetemperature thermistor reads 212°F or less 3 minutes later.
When the outdoor heat exchangertemperature exceeds 158°Fduring cooling or the indoor gaspipe temperature exceeds 158°Fduring heating.
When the fin temperature exceeds188.6°F during operation.
When the P.C. board temperatureexceeds 158°F during operation.
When failure occurs continuouslythree times within 30 seconds afterthe fan gets started.
When nonvolatile memory datacannot be read properly.
When the frequency of thecompressor is kept 80Hz ormore and the dischargetemperature is kept under 102.2°Ffor more than 20 minutes.
Outdoor power system
Discharge temperaturethermistor
Defrost thermistorAmbient temperature thermistorFin temperature thermistorP.C. board temperaturethermistor
Outdoor heat exchanger temperature thermistor
Overcurrent
Discharge temperature
High pressure
Fin temperature
P.C. board temperature
Outdoor fan motor
Nonvolatile memory data
Discharge temperature
None (Normal)
Abnormal point(Failure mode/protection)
Condition RemedyIndoor/outdoor
unit failure moderecall function
LED indication(Outdoor P.C. board)LED 1 LED 2
2. Outdoor unit failure mode table
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.).
41
Operation start
Check the outdoor unit LED indicator.
Refer to 11-6. "Check of power supply".
• Indoor unit serial signal errorRefer to 11-6. "How to checkmis-wiring andserial signalerror".
• COOL or HEAToperation onlyRefer to 11-6. "Check of R.V. coil".
• When cooling, room is not cool.Refer to 11-6."How to checkinverter/compressor".
• When cooling, heat exchanger of non-operating indoor unit frosts.•When heating, non- operating indoor unit gets warm.Refer to 11-6. "Check of LEV".
• When heating,room does not get warm.Refer to 11-6."How to checkinverter/compressor".Check mis-piping, shortage of capacity.
• When coolingdew drops in thenon-operatingindoor unit.Check ofmiss-piping.
Refer to 11-4. "Troubleshooting check table".
Both LED1 andLED2 are OFF.
Both LED 1 and LED 2 are lighting.
LED 1 or LED 2has blinked.
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.
11-time flash
15-time flash
• Check the connecting wire between outdoor electronic control P.C. board and power board.
• Replace the power board.
• Check the connecting wire among electronic control P.C. board, noise filter P.C. board and power board.
• Check the voltage of power supply.• Replace the power board.
• Check the voltage of power supply.• Replace the outdoor electronic control P.C. board.
• Refer to 11-6. "Check of LEV". • Check the drain pump of the indoor unit.
When the communication betweenboards protection stop iscontinuously performed twice.
Communication error occursbetween the electronic control P.C.board and power board for morethan 10 seconds.
Current sensor protection stop iscontinuously performed twice.
When a short or open circuit isdetected in the current sensorduring compressor operating.
The protection stop of the zerocross detecting circuit iscontinuously performed 10 times.
When zero cross signal cannot bedetected while the compressor isoperating.
When a failure is detected in theoperation of the converter duringoperation.When the bus-bar voltage exceeds400V or falls to 200V or belowduring compressor operating.When the bus-bar voltage exceeds400V or falls to 50V or below duringcompressor operating.
Communication errorbetween P.C. boards
Current sensor
Zero cross detecting circuit
Converter
Bus-bar voltage(1)
Bus-bar voltage(2) Even if this protection stop isperformed continuously threetimes, it does not mean theabnormality in outdoor powersystem.
LEV for drain
Lighting 6 times
Lighting 7 times
5 times Goesout
5 times Goesout
5 times
6 times
Goesout
Goesout
When the indoor unit detects anyabnormal in the LEV for drain.
Lighting Lighting
Abnormal point(Failure mode/protection)
Condition RemedyIndoor/outdoor
unit failure moderecall function
LED indication(Outdoor P.C. board)LED 1 LED 2
The left lamp of OPERATION INDICATOR
lamp(Indoor unit)
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4.).
42
11-4. TROUBLESHOOTING CHECK TABLE
LED2 LED1
Outdoor electronic control P.C. board (Parts side)
Lighting
LED1 LED2
Lighting
LED1(Red) LED2(Yellow)
Lighting Twice Outdoor power system
• Check the connection of the compressor connecting wire.• Refer to 11-6. "How to check inverter/compressor". • Check the stop valve.
Lighting 3 times Discharge temperaturethermistor
• Refer to 11-6. "Check of outdoor thermistors".
Outdoor heat exchangertemperature thermistor
Defrost thermistor
Lighting 7 times Nonvolatile memory data • Replace the outdoor electronic control P.C. board.
Lighting 8 times Current sensor • Replace the power board.
Lighting 11 times Communication errorbetween P.C. boards
• Check the connecting wire between outdoor electronic control P.C. board and power board.
Lighting 12 times Zero cross detectingcircuit
• Check the connecting wire among outdoor electronic control P.C. board, noise filter P.C. board and power board.
Abnormal point / Condition Correspondence
When a short circuit is detected in the thermistor during operation, orwhen an open circuit is detected in the thermistor after 5 minutes (incooling) and 10 minutes (in heating) of compressor start-up.
When a short circuit is detected in the thermistor during operation, orwhen an open circuit is detected in the thermistor after 5 minutes ofcompressor start-up.
• Refer to 11-6. "Check of outdoor thermistors".
• Refer to 11-6. "Check of outdoor thermistors".
• Replace the outdoor electronic control P.C. board.
Indication
When over current protection stop is continuously performed three times within 1 minute after the compressor gets started, or when converter protection stop or bus-bar voltage protection stop is continuously performed three times within 3 minutes after start-up.
When a short circuit is detected in the thermistor during operation, orwhen an open circuit is detected in the thermistor after 10 minutes of compressor start-up.
Condition
When the nonvolatile memory data cannot be read properly.
Fin temperaturethermistorP.C board temperaturethermistor
Lighting 4 times
Ambient temperaturethermistor
Current sensor protection stop is continuously performed twice.
When the communication protection stop between boards is continuously performed twice.
The protection stop of the zero cross detecting circuit is continuouslyperformed 10 times.
When a short or open circuit is detected in the thermistor duringoperation.
When a short or open circuit is detected in the thermistor duringoperation.
5 timesLighting
IPM protection
Lock protection
3 times Goes out Discharge temperatureprotection
Fin temperatureprotectionP.C. board temperatureprotection
High-pressureprotection
8 times Goes out Converter protection • Replace the power board.
Bus-bar voltageprotection (1)
• Check the voltage of power supply.• Replace the power board or the outdoor electronic control P.C. board.• Refer to 11-6. "Check of bus-bar voltage".
Bus-bar voltageprotection (2)
13 times Goes out Outdoor fan motor • Refer to 11-6. "Check of outdoor fan motor".
Lighting 8 timesCurrent sensorprotection • Replace the power board.
Lighting 11 times Communication between P.C.boards protection
• Check the connecting wire between outdoor electronic control P.C. board and power board.
Lighting 12 times Zero cross detecting circuitprotection
• Check the connecting wire among outdoor electronic control P.C. board, noise filter P.C. board and power board.
• Check around of gas and the refrigerant circuit.• Check of stop valve.
• Check the amount of gas and refrigerant circuit.• Refer to 11-6. "Check of LEV".
•Check refrigerant circuit and refrigerant amount.•Refer to 11-6. "Check of outdoor fan motor".
• Reconnect compressor connector.• Refer to 11-6. "How to check inverter/compressor". • Check the stop valve.• Check the power module (PAM module).
Twice Goes out
4 times Goes out
5 times Goes out
9 times Goes out
When overcurrent is detected after 30 minutes of compressor start-up.
When overcurrent is detected within 30 minutes of compressor start-up
When the bus-bar voltage exceeds 400V or falls to 200V or below during compressor operating.When the bus-bar voltage exceeds 400V or falls to 50V or below during compressor operating.
When discharge temperature exceeds 240.8°F during operation. Compressor can restart if discharge temperature thermistor reads 212°For less 3 minutes later.
When the fin temperature exceeds 188.6°F during operation.
When the P.C. board temperature exceeds 158°F during operation.
When failure occurs continuously three times within 30 seconds after the fan gets started.When a short or open circuit is detected in the current sensor duringcompressor operating.Communication error occurs between the outdoor electronic control P.C. board and power board for more than 10 seconds.When zero cross signal cannot be detected while the compressor isoperating.
When high-pressure is detected with the high-pressure switch (HPS)during operation. (MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA)When the outdoor heat exchanger temperature exceeds 158°Fduring cooling or when indoor gas pipe temperature exceeds 158°Fduring heating.When a failure is detected in the operation of the converter duringoperation.
Outdoor unit does not operate.
Lighting Once LEV for drain • Refer to 11-6. "Check of LEV".• Check the drain pump of the indoor unit.When the indoor unit detects any abnormality in the LEV for drain.
No.
1
2
3
4
5
6
7
9
8
10
11
12
13
14
15
16
17
18
19
Symptom
'Outdoor unit stops and restarts 3 minuteslater' is repeated.
MXZ-2B20NA
MXZ-3B24NA, MXZ-3B30NAMXZ-4B36NA
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.(Example) When the flashing frequency is “2”.
ON
OFF2.5-second OFF 2.5-second OFF
0.5-second ON 0.5-second ON
NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. 2. LED is lighted during normal operation.
43
Primary current protection
Secondary current protection
High-pressure protection
Defrosting in cooling
3 times Lighting Discharge temperatureprotection
• Check refrigerant circuit and refrigerant amount.• Refer t1 11-6. "Check of LEV".• Refer to 11-6. "Check of outdoor thermistors".
4 times LightingLow dischargetemperature protection
• Refer to 11-6. "Check of LEV".• Check refrigerant circuit and refrigerant amount.
5 times LightingCooling high-pressureprotection
This symptom does not mean any abnormality of theproduct, 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.
-
-
These symptoms do not mean any abnormality of theproduct, 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.Twice Lighting
Once Lighting
When the frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 122°F(COOL mode)/104°F(HEAT mode) for more than 40 minutes.
When the frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 102.2°F for more than 20minutes.
When the outdoor heat exchanger temperature exceeds 136.4°Fduring operation.
9 times Lighting Inverter check mode
Lighting Lighting Normal
When the unit is operated with emergency operation switch.
-
When the input current exceeds 15A.
When the current of the compressor exceeds 15A.
When the indoor gas pipe temperature exceeds 113°F during heating.
When the indoor gas pipe temperature falls 37.4°F or below during cooling.
Outdoor electronic control P.C. board(Parts side)
LED2 LED1
Lighting
MXZ-2B20NA
LED1 LED2
Lighting
MXZ-3B24NA, MXZ-3B30NAMXZ-4B36NA
LED1(Red) LED2(Yellow)Abnormal point / Condition RemedyIndication Condition
Outdoor unit operates.
Outdoor unitoperatesnormally.
No. Symptom
21
22
23
24
25
26
27
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.(Example) When the flashing frequency is “2”.
ON
OFF2.5-second OFF 2.5-second OFF
0.5-second ON 0.5-second ON
NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. 2. LED is lighted during normal operation.
44
11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Normal
Discharge temperaturethermistor (RT62)
Fin temperaturethermistor (RT64)
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
Part name Check method and criterion
1.2 k Ω ~1.56 kΩ
Measure the resistance between terminals using a tester.(Winding temperature: 14°F ~ 104°F)
Compressor
Measure the resistance between lead wires using a tester.(Part temperature: 14°F ~ 104°F)
Outdoor fan motor
R.V. coil
Measure the resistance using a tester. (Part temperature: 14°F ~ 104°F)
13.4 Ω ~ 16.4 Ω
Normal (Each phase)
13 Ω ~ 16 ΩMXZ-2B20NA - MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Defrost thermistor (RT61)
Ambient temperaturethermistor (RT65)Outdoor heat exchangertemperature thermistor(RT68)
Measure the resistance with a tester.
Refer to 11-7. “Test point diagram and voltage”,1. “Outdoor electronic control P.C.board”, or 3. “Outdoor power 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 electronic control P.C.board”, for the chart of thermistor.
MXZ-2B20NA
0.86 Ω ~ 1.06 Ω 1.29 Ω ~ 1.49 ΩMXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Normal (Each phase)
MXZ-2B20NA
MXZ-2B20NA -MXZ-3B24NAMXZ-3B30NAMXZ-4B36NA
1
Linear expansion valve
LEV
WHT
RED
YLW BRN
ORN
BLU
The other models
WHT - REDRED - ORN 37.4 Ω ~ 53.9 Ω
Normal
YLW -- BLU
Color of lead wire
MXZ-2B20NA
WHT - REDRED - ORNYLW - REDRED - BLUBRN
BRN
High pressure switch(HPS)MXZ-3B24NAMXZ-3B30NAMXZ-4B36NA
Pressure Normal
HPS537 ± 22 PSIG696 PSIG Open
Close+ 7- 15
1
W
UVWHT
RED
BLK
URED
WHT
BLK
V
W
(W)
(V)
(U)
LEV
WHT
RED
YLW
ORN
BLU
45
Check of power supply
Outdoor unit does not operate.
Turn ON the power supply.
No
Yes
Yes
No
Yes
No
Yes
No Replace the power board.
Check the connecting of parts of main power supply circuit.
Is there voltage of 208/230 V AC in the power supply terminal block?
Is the output voltage from the noisefilter P.C. board 208/230 V AC?
Is the input voltage to the outdoor electronic control P.C. board 294/325 V DC?
Check the power supply cable.
Replace the outdoor electronic control P.C. board.
Replace the noise filter P.C. board.
Is the input voltage to the power board208/230 V AC? Replace the reactor.
11-6. TROUBLESHOOTING FLOWMXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
46
Is there rated voltage in the power supply ?
Is there any mis-wiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire ?
1 Mis-wiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts.
(Lighted or not lighted)
No
Yes
No
Yes
Yes
No
Yes
No
Be sure to release the failure-moderecall function after checking.
No
No
Yes
No
Yes
Yes
Yes
No
Yes
Refer to indoor unit service manual.
Turn OFF the power supply.
Turn ON the power supply.
Is there rated voltage betweenoutdoor terminal block S1 andS2 ?
Does the left lamp of OPERATIONINDICATOR lamp light up ? <Confirmation of the power to the indoor unit>
Press EMERGENCY OPERATION switch once.
Check the powersupply.
A
Turn OFF the power supply.Check once more if the indoor/outdoorconnecting wire is not mis-wiring.Short-circuit outdoor terminal block S2 andS3.
1
B
Turn ON the power supply.
Check the wiring.
Correct them.
Turn OFF the power supply.Remove the short-circuit betweenoutdoor terminal block S2 and S3.Turn ON the power supply.Is there amplitude of 10 to 20 V DCbetween outdoor terminal block S2and S3 ? <Confirmation of serialsignal>
Is there rated voltage between indoor terminal block S1 and S2 ?<Confirmation of power voltage>
Replace the indoor electronic control P.C. board.
2 Be careful of the residual voltage of smoothing capacitor.
Replace the outdoor electronic control P.C. board. 2
Is there any error of theindoor/outdoor connecting wire,such as the damage of the wire,intermediate connection, poorcontact to the terminal block ?
Replace theindoor/outdoorconnecting wire.
Is serial signalerror indicated 6 minutes later ?
Yes
No
· Turn OFF inverter-controlled lighting equipment.
· Turn OFF the power supply and then turn ON again.
· Press EMERGENCY OPERATION switch.
B
· Reinstall either the unit or the light away from each other.
· Attach a filter on remote controlreceivingsection of the indoor unit.
A
Is serial signal error indicated 6 minutes later ?
No
Does the LED on the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking" ?
MXZ-2B20NA
LED indication for communication statusCommunication status is indicated by the LED.
Blinking: normal communicationLighting: abnormal communication or not connectedPattern 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.
Outdoor electronic control P.C. board
Blinking
LED 3
Lighting
Goes out
LED 1LED 2
(Parts side)
LED3 LED2 LED1
Unit status
Pattern
1
2
Unit Bstatus
Lighting
Unit AstatusUnit Cstatus
MXZ-3B24NAMXZ-3B30NAMXZ-4B36NAOutdoor electronic control P.C. board
Blinking
(Parts side)
LED1 LED2 LED3
LED 1 LED 3LED 2Pattern
1
2
Unit Bstatus
Unit AstatusUnit Dstatus
Unit Cstatus
Goes outLighting
How to check mis-wiring and serial signal error
• 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.
47
Check of R.V. coil
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
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 V AC between pin1 and pin 2 at connector CN912 ?
Turn OFF the power supply of indoor and outdoor unit.
1. Turn OFF the power supply of indoor and outdoor unit, and disconnect the connector CN781.2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode.
Replace the 4-way valve. Replace the noise filter P.C. board.
Replace the R.V. coil.Is there voltage of 12 V DC between the connector CN781 pin 5 (+) and pin 3 (-) ?
Replace the outdoor electronic control P.C. board.
Disconnect the connector CN912. Is there normal resistance to R.V. coil ?(Refer to 11-5.)
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 V AC between pin1 and pin 2 at connector CN912 ?
1. Turn OFF the power supply of the indoor and the outdoor unit, and disconnect the connector CN781.2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in COOL mode.
Replace the 4-way valve.
Replace the noise filter P.C. board.Is there voltage of 12 V DC between the connector CN781 pin 5 (+) and pin 3 (-) ?
Replace the outdoor electronic control P.C. board.
If the connector CN912 is not connected or R.V. coil is open, voltage occurs between terminals even when the control is OFF.
• When heating operation does not work.
• When cooling operation does not work.
The cooling operation or heating operation does not operate.
CN912CN781
Noise filter P.C. boardOutdoor electronic controlP.C. board
48
Check of LEV
No
Yes
No
Yes
Turn ON the power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.
Is "click - click" sound heard ?Or, do you feel vibration of LEV coil with your hand ?
Disconnect the connectors.MXZ-2BCN791: LEV A, CN792: LEV B, CN795: LEV E MXZ-3B/4BCN791: LEV A, CN792: LEV B, CN793: LEV C, CN794: LEV D(MXZ-4B only), CN796: LEV F Is there normal resistance to LEV coil ?(Refer to 11-5.)
Normal
Replace the outdoor electronic control P.C. board.
Replace LEV coil.
• When cooling, heat exchanger of non-operating indoor unit frosts.• When heating, non-operating indoor unit get warm.
49
How to check inverter/compressor
• When heating, room does not get warm.• When cooling, room does not get cool.
No
No
Yes
Yes
Yes
No
Yes
No
Disconnect the terminal of the compressor. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION.
Is output balanced ?
Clarify the causes by counting time until the inverter stops.0 to 10 seconds: compressor layer short 10 to 60 seconds: compressor lock60 seconds to 5minutes: refrigerant circuit defective5 minutes or more: normal
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.)
Is the input voltage to the outdoor electronic control P.C. board 370 V or more ?
Reconnect the lead wire of compressor, and turn ON the power supply to indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION.
Replace the compressor.
Replace the power board.
1 • After the outdoor fan starts running, wait for 1 minute or more before measuring the voltage. • The output voltage values have the tolerance of ± 20%. 2 • The output differs depending on the capacity or the number of indoor units to be operated.
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: 50V-250VIs proper output voltage detected? 1, 2
50
Check of outdoor thermistors
• When thermistor is abnormal.
ThermistorDefrostDischarge temperatureOutdoor heat exchanger temperature Ambient temperatureFin temperature
SymbolRT61RT62RT68RT65RT64
Connector, Pin No.Between CN661 pin1 and pin2Between CN661 pin3 and pin4Between CN661 pin7 and pin8 Between CN663 pin1 and pin2Between CN3 pin1 and pin2
Outdoor electronic control P.C. board
Outdoor power board
Board
Check of outdoor fan motor
• Fan motor does not operate or stops operating shortly after starting the operation.
Yes
Yes
YesNo
(Fixed to either 5 V or 0 V DC)
No
No
Turn ON the power supply.Rotate the outdoor fan motor manually and measure the voltage of CN931.Between (+) and (-)Between (+) and (-)Between (+) and (-)
Does the outdoor fan motor rotate smoothly ?
Does the voltage between each terminal become 5 V DC and 0 V DCrepeatedly ?
Replace the outdoor fan motor. Replace the outdoor electronic control P.C. board.
Disconnect CN932 from the outdoor electronic control P.C. board, and measure the resistance of the outdoor fan motor.
Is the resistance of outdoor fan motor normal? (Refer to 11-5.)
Normal
Yes
No
AbnormalDisconnect 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.)
Does the unit operate 10 minutes or more without showing thermistor abnormality ?
Replace the thermistor except RT64. In case that RT64 is abnormal, replace the outdoor power board since RT64 is combined with the outdoor power board.
Normal
Replace the outdoor electronic controlP.C. board or the outdoor power board.
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.
51
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.
• When the operation frequency does not go up from the lowest frequency.
Check of bus-bar voltage•Check the voltage of power supply. •Confi rm outdoor unit failure mode recall function. (Refer to 11-2.2.)
Blink 5 times
Confi rm LED1 indication lamp on the outdoor electronic control P.C. board.
Replace the power board.
Blink 9 times
Replace the outdoor elec-tronic control P.C. board.
Turn OFF power supply before removing P.C. board.
Confi rm LED1 indication lamp on the outdoor electronic con-trol P.C. board.
Turn ON power supply. Start operation.
Blink 6 times
Replace the outdoor elec-tronic control P.C. board.
Lighting
Replace the outdoor elec-tronic control P.C. board.
Blink 9 times
Replace the power board.
Confi rm LED1 indication lamp on the outdoor electronic con-trol P.C. board.
Turn ON power supply. Start operation.
NormalLighting Lighting
Check of HPS
Infinity
0 Ω
No
Yes
1. Disconnect the connector CN681 in the electronic control P.C. board.2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF.
Check the resistance between each terminal.
Reconnect CN681.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 ?
Replace HPS.
Replace the electronic control P.C. board.
Normal
MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
52
700
600
500
400
300
200
100
0
Res
ista
nce
(kΩ
)
Temperature (°F)
Discharge temperature thermistor (RT62)
32 50 68 86 104 122 140 158 176 194 212 230 248
-4 14 32 50 68 86 104
100
90
80
70
60
50
40
30
20
10
0
Resis
tanc
e (kΩ
)
Temperature (°F)
Defrost thermistor (RT61)Ambient temperature thermistor (RT65)Outdoor heat exchanger temperaturethermistor (RT68)
11-7. TEST POINT DIAGRAM AND VOLTAGE1. Outdoor electronic control P.C. boardMXZ-2B20NA
LED 1
LED 2
Bus-bar voltageCN801
294 V DC~
370 V DCInput
( (
(LE
V R
oom
A
(12
V D
Cpu
lse
wav
e
(
LEV
Roo
m
B(
12 V
DC
puls
e w
ave
CN
932
20-9
0 V
AC
GN
D5
V5 V
DC
puls
e w
ave
( To fa
nm
otor
Def
rost
ther
mis
tor (
RT6
1)D
isch
arge
tem
pera
ture
ther
mis
tor (
RT6
2)
Out
door
hea
t exc
hang
er
tem
pera
ture
ther
mis
tor (
RT6
8)
( ((+)
(–)(+)Rush
curre
nt re
lay (–
) (–
)R.V
. coi
l
( 12 V
DC
15 V
15 VC
N93
1
(+)(–)
(
CN
661
CN
701
Sig
nal t
rans
mis
sion
(To
pow
er b
oard
)5
V D
C p
ulse
wav
e
(+)
(–)
(G
ND
CN
702
Sig
nal r
ecep
tion
(Fro
m p
ower
boa
rd)
5 V
DC
pul
se w
ave
GND
(pow
er b
oard
)
CN
781
LEV
E ((+)
(–) ((+)
(–) ( CN
791
CN
792
( ( (
F801FUSE
T3.15AL250V
LED 3
( Ambi
ent t
empe
ratu
reth
erm
isto
r (R
T65)
CN
663
Serial signal Room B12~24 V DC
Serial signal Room A12~24 V DC
CN602
CN601
208/230 V ACInput
SW1
CN
795
12 V
DC
puls
e w
ave
DM
06Y7
65
53
MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
LED 1LED 2
F931FUSE
T3.15AL250V
( CN
932
20-9
0 V
AC
GN
D5
V D
C
5 V
DC
puls
e w
ave
( To fa
nm
otor
(+)(–)R
ush
curre
nt re
lay
(–)R
.V. c
oil
CN
781
CN
663
CN
701
CN
702
CN
661
CN681High pressure switch
(
Bus-bar voltageCN801
294~370 V DCInput
LED 3
Serial signal Room A12~24 V DC
CN611Serial signal Room B12~24 V DC
CN621Serial signal Room C12~24 V DC
CN601208/230 V ACInput
SW1SW2
SW871
F801FUSE
T3.15AL250V
CN791LEV Room A
CN792LEV Room B
CN793LEV Room C
((
–
+
{CN796LEV F12 V DCpulse wave
Def
rost
ther
mis
tor (
RT6
1)D
isch
arge
tem
pera
ture
ther
mis
tor (
RT6
2)O
utdo
or h
eat e
xcha
nger
te
mpe
ratu
re th
erm
isto
r (R
T68)
Am
bien
t tem
pera
ture
ther
mis
tor (
RT6
5)S
igna
l tra
nsm
issi
on(T
o po
wer
boa
rd)
5 V
DC
pul
se w
ave
Sig
nal r
ecep
tion
(Fro
m p
ower
boa
rd)
5 V
DC
pul
se w
ave
GN
DG
ND
15 V
DC
-4 14 32 50 68 86 104
100
90
80
70
60
50
40
30
20
10
0
Res
ista
nce
(kΩ
)
Temperature (°F)
Defrost thermistor (RT61)Ambient temperature thermistor (RT65)Outdoor heat exchanger temperature thermistor (RT68)
CN794LEV Room D
CN631Serial signal Room D12~24 V DC
700
600
500
400
300
200
100
0
Res
ista
nce
(kΩ
)
Temperature (°F)
Discharge temperature thermistor (RT62)
32 50 68 86 104 122 140 158 176 194 212 230 248
54
2. Noise filter P.C. board
208/230 V ACOutput
F64 FUSET2AL250V
{
{
CN901To electroniccontrol P.C. board
CN912R.V. coil208/230 V AC
{
CN902To powerboard
CN903To powerboard
F65FUSET6.3AL250V
MXZ-2B20NA
208/230 V ACInput
CN61208/230 V AC Output
MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
208/230 V ACOutput
F64 FUSET2AL250V
{ {
CN901To electroniccontrol P.C. board
CN912R.V. coil208/230 V AC{
CN902To powerboard
CN903To powerboard
208/230 V ACInput
F65FUSET6.3AL250V
CN61208/230 V AC Output
55
MXZ-2B20NA3. Outdoor Power board
(Red)
(White)
Connect to the compressorVoltage among phases: 5 V to 180 V
Connect to the earth
CN5Primary current detection(Connect to the noise filter)
CN2Connect to the controller board(+)1-5(–): Signal transmission (To electronic control P.C. board) 5 V DC pulse wave(+)2-5(–): Zero cross signal 3-4 : Not used(+)6-5(–): 15 V(+)7-5(–): 15 V
(+)
(–)
Signal reception (From electronic control P.C. board) 5 V DC pulse wave
)
CN3Fin temperature thermistor RT64
294-370 V DCOutput
1
3
200
180
160
140
120
100
80
60
40
20
0
Res
ista
nce
(kΩ
)
Temperature (°F)32 50 68 86 104 122 140 158 176
Fin temperature thermistor (RT64)
DM00N019 or DM00N095
56
MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
(Red)
(White)
Connect to the compressorVoltage among phases: 5 V to 180 V
Connect to the earth
CN5Primary current detection(Connect to the noise filter)
CN2Connect to the controller board(+)1-5(–): Signal transmission (To electronic control P.C. board) 5 V DC pulse wave(+)2-5(–): Zero cross signal 3-4 : Not used(+)6-5(–): 15 V(+)7-5(–): 15 V
(+)
(–)
Signal reception (From electronic control P.C. board) 5 V DC pulse wave
)
CN3Fin temperature thermistor RT64
294-370 V DCOutput
1
3
200
180
160
140
120
100
80
60
40
20
0
Res
ista
nce
(kΩ
)
Temperature (°F)32 50 68 86 104 122 140 158 176
Fin temperature thermistor (RT64)
57
DISASSEMBLY INSTRUCTIONS12
(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism.
Slide the sleeve. Pull the terminal while pushing the locking lever.
Hold the sleeve, and pull out the terminal slowly.
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.
<"Terminal with locking mechanism" Detaching points>
Connector
Sleeve
Locking lever
OPERATING PROCEDURE PHOTOS1. Removing the compressor(1) Remove the screws of the top panel, and remove the top panel.(2) Remove the screws of the service panel, and remove the service panel.(3) Recover gas from the refrigerant circuit.NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG.
(4) Remove the screws of the cabinet, and remove the cabinet.(5) Remove the screws of the back panel, and remove the back panel (Photo 3).(6) Disconnect the compressor lead wire from terminal of the compressor (U, V, W).(7) Disconnect the outdoor electronic control P.C. board connectors: CN661, CN663, CN791, CN792, CN795, CN931, CN932 Disconnect the noise filter P.C. board connector: CN912(8) Remove the screws of the electrical parts, and remove the electrical parts (Photo 4).(9) Remove the propeller.(10) Remove the screws of the separator, and remove the separator (Photo 6).(11) Remove the sound proof felt (Photo 6).(12) Detach the welded parts of the compressor suction and dis- charge pipes (Photo 5).(13) Remove the compressor nuts and remove the compressor.
Photo 2
Photo 1
Screws of the cabinet
Screws of the top panel
Screw of the cabinet
Screws of the cabinetScrews of service panel
Screws of the top panel
Screws of the cabinet
Screws of the cabinet
Screws of thesub panel
12-1. MXZ-2B20NA
58
OPERATING PROCEDURE PHOTOS
3. Removing the fan motor(1) Remove the top panel, the service panel, and the cabinet (Photo 1, 2).(2) Disconnect the connector CN931 and CN932 on the outdoor electronic control P.C. board.(3) Remove the propeller.(4) Remove the fan motor.
Photo 42. Removing the electronic control P.C. board(1) Remove the screws of the sub panel.(2) Remove the sub panel.(3) Disconnect all connectors and lead wires on the electronic control P.C. board.(4) Remove the electronic control P.C. board.
Photo 3Screw of the rear guard
Screws of the back panel
Screw of theback panel
Screws ofthe back panel
Screws ofthe back panel
Screws ofthe electricalparts
R.V. coil
4 way valve
LEV coil E
Expansion valve E
Suction pipewelded part
Dischargepipe welded part
Photo 5
Compressor nuts
Photo 6
Screws of the outdoor fan motor
PropellerPropeller nutSeparator
Sound proof felt
59
OPERATING PROCEDURE PHOTOS
6. Removing the reactor(1) Remove the top panel (Photo 1).(2) Remove the service panel, cabinet, back panel, and the electrical parts (Photo 1, 2, 3, 4).(3) Disconnect the reactor lead wire from the terminal of the reactor.(4) Remove the screws of the reactor, and remove the reactor (Photo 9).
Photo 9
4. Removing the 4-way valve(1) Remove the top panel (Photo 1).(2) Remove the service panel, the cabinet, and the back panel (Photo 1, 2, 3).(3) Recover gas from the refrigerant circuit.NOTE: Recover gas from the pipes until the pressure gauge shows 0 PSIG.
(4) Remove the electrical parts (Photo 4).(5) Detach the welded parts of 4-way valve and pipe (Photo 7).
5. Removing the expansion valve(1) Remove the top panel (Photo 1).(2) Remove the service panel, the cabinet, and the back panel (Photo 1, 2, 3). (Gas recovery is not required if the unit is pumped down.)(3) Remove the electrical parts for removing LEV E (Photo 4, 5).(4) Remove the LEV coils.(5) Detach the welded parts of expansion valves and pipes.
4 way valve
R.V. coil
Photo 7
Photo 8
Welded parts
Expansion valves LEV coils
Screws of the reactor
60
1. Removing the compressor(1) Remove the screws of the top panel, and remove the top
panel.(2) Remove the screws of the service panel, and remove the
service panel.(3) Recover gas from the refrigerant circuit. NOTE : Recover gas from the pipes until the pressure gauge shows 0 PSIG.(4) Remove the screws of the front panel, and remove the front
panel.(5) Remove the screws of the rear panel, and remove the rear
panel.(6) Disconnect the compressor lead wire from terminal of compressor (U, V, W).(7) Disconnect the outdoor electronic control P.C. board connectors: CN661, CN663, CN681, CN791, CN792, CN793, CN794 (MXZ-4B36NA), CN796, CN931, CN932 Disconnect the noise filter P.C. board connector: CN912(8) Remove the screws of the electrical parts, and remove the electrical parts.(9) Remove the propeller.(10) Remove the screws of the separator, and remove the separator.(11) Remove the sound proof felt (Photo 5).(12) Detach the welded parts of the compressor suction and dis- charge pipes (Photo 4).(13) Remove the compressor nuts and remove the compressor.
OPERATING PROCEDURE PHOTOSPhoto 1
Photo 2
12-2. MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
Photo 3
Screws of the top panel
Screws of the top panel
Screws of the side panel
Screws of the front panel
Screws of service panel
Screws of the service panel
Screws of the rear panel
Screws of the electrical parts
Photo 4
Discharge pipe welded part
Suction pipe welded part
Photo : MXZ-3B24NA
61
OPERATING PROCEDURE PHOTOS
3. Removing the 4-way valve(1) Remove the top panel (Photo 1, 2).(2) Remove the service panel, rear panel, and pipe cover (Photo
1,2). (3) Recover gas from the refrigerant circuit. NOTE : Recover gas from the pipes until the pressure gauge shows 0 PSIG.(4) Remove the electrical parts (Photo 3).(5) Detach the welded parts of 4-way valve and pipe.
4. Removing the expansion valve(1) Remove the top panel (Photo 1, 2).(2) Remove the service panel (Photo 1, 2). (Gas recovery is not required if the unit is pumped down.) (3) Remove the front panel for removing LEV F (Photo 1).(4) Remove the electrical parts for removing LEV F (Photo 3).(5) Remove the LEV coils.(6) Detach the welded parts of expansion valves and pipes.
LEV coils
Expansion valves
Photo 7
2. Removing the fan motor(1) Remove the top panel, the service panel, and the front panel (Photo 1, 2).(2) Disconnect the connectors CN931 and CN932 on the outdoor
electronic control P.C. board.(3) Remove the propeller.(4) Remove the fan motor.
Photo 5
Separator
Sound proof felt
Propeller
Screws of the outdoor fan motor
4 way valve
R.V. coil
Welded parts
Photo 6
LEV coil F Expansion valve F
Propeller nut
Photo : MXZ-3B24NA
62
OPERATING PROCEDURE PHOTOS5. Removing the reactor(1) Remove the top panel (Photo 1, 2).(2) Disconnect the reactor lead wire.(3) Remove the screws of the reactor, and remove the reactor.
Photo 8
Photo : MXZ-3B24NA
Screws of the reactor
63
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2009 MITSUBISHI ELECTRIC CO., LTDDistributed in Mar. 2010. No. OBH560 REVISED EDITION-C 6Distributed in Feb. 2010. No. OBH560 REVISED EDITION-B 6Distributed in Dec. 2009. No. OBH560 REVISED EDITION-A 5Distributed in Sep. 2009. No. OBH560 5Made in Japan
New publication, effective Mar. 2010Specifications subject to change without notice.
MXZ-2B20NA MXZ-2B20NA-1 COOLING
MXZ-2B20NA MXZ-2B20NA-1 HEATING
MXZ-3B24NA COOLING
MXZ-3B24NA COOLING
MXZ-3B24NA HEATING
MXZ-3B24NA HEATING
MXZ-3B30NA COOLING
MXZ-3B30NA COOLING
MXZ-3B30NA COOLING
MXZ-3B30NA HEATING
MXZ-3B30NA HEATING
MXZ-3B30NA HEATING
MXZ-4B36NA COOLING
MXZ-4B36NA COOLING
MXZ-4B36NA COOLING
MXZ-4B36NA COOLING
MXZ-4B36NA COOLING
MXZ-4B36NA HEATING
MXZ-4B36NA HEATING
MXZ-4B36NA HEATING
MXZ-4B36NA HEATING
MXZ-4B36NA HEATING
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