Mitsubishi Electric MSZ-A.NA Series Manuel de service

ModelsSERVICE MANUALCONTENTS1. TECHNICAL CHANGES ··································· 22. PART NAMES AND FUNCTIONS ····················· 33. SPECIFICAT

10MXZ-3B24NAMXZ-3B30NAUnit: inchABC15/16"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&q

11MXZ-4B36NAABCD15/16"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"

12WIRING DIAGRAM6MXZ-2B20NAMXZ-2B20NA -1

13MXZ-3B24NAMXZ-3B30NAMXZ-4B36NA

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

15Stop valve withservice portStop valveStrainer#100PowerreceiverLEV ALEV BOil separatorCompressorDefrostthermistorRT61DistributorMuffler4-way valveLEV

16 Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the tables below. When the

17Stop valve (with service port)Stop valvePowerreceiverLEV ALEV BLEV COil separatorCompressorMuffler4-way valveLEV FIndoor unitCIndoor unitBIndoor uni

18 Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the tables below. When the

19Stop valve (with service port)Stop valvePowerreceiverLEV ALEV BLEV COil separatorCompressorMuffler4-way valveLEV FIndoor unitCIndoor unitBIndoor uni

TECHNICAL CHANGES21Revision B:• MXZ-3B24NA and MXZ-4B36NA have been added.MXZ-2B20NANew modelMXZ-2B20NA MXZ-2B20NA -11. Outdoor fan motor has been

20 Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the tables below. When the

21DATA8ModelMXZ-2B20NAIndoor type Non-Duct (09+09) Duct (09+12)Item Unit Cooling Heating Cooling HeatingTotalCapacity But/h 18,000 22,000 20,000 22,00

22ModelMXZ-4B36NAIndoor type Non-Duct (09+09+09+09) Duct (09+09+09+09)Item Unit Cooling Heating Cooling HeatingTotalCapacity But/h 35,400 36,000 34,40

23(2) OPERATION FunctionCoolingHeating"A" Cooling steady stateat rated compressor speed "B-2" Cooling steady state at rated compre

24MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NAThe standard specifications apply only to the operation of the air conditioner under normal conditions

2509 class(47Hz)12 class(59Hz)15 class(78Hz)Indoor unit class(Inverter output frequency)Indoor air Dry-bulb temperaturedifference (degree)22.120.518.7

2606 class(15Hz)*24 class(56Hz)18 class(49Hz)15 class(33Hz)12 class(29Hz)Indoor unit class(Inverter output frequency)Indoor air Wet-bulb temperaturedi

270501000.51.01.52.00 50 1000.51.01.52.00501000.51.01.52.00501000.51.01.52.00501000.51.01.52.00 50 1000.51.01.52.00501000.51.01.52.00 50 1000.51.01.52

28 (OUTDOOR UNIT: MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)0 50 1000.51.01.52.00 50 1000.51.01.52.00501000.51.01.52.00 50 1000.51.01.52.00 50 1000.51.01.52

298-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA)(1) COOL operation Data is based on

3PART NAMES AND FUNCTIONS2MXZ-2B20NAAir outletDrain outletAir inlet(Back and side)MXZ-3B24NA MXZ-3B30NA MXZ-4B36NAAir outletDrain outletAir inlet(Ba

302. 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 sp

313. 12-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA)(1) COOL operation65 70 75 80 85 90 95 100 105 110 115120140150160170130Ambient tempe

324. 15-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA)(1) COOL operation65 70 75 80 85 90 95 100 105 110 115120130140150160170Ambient tempe

335. 06-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operationData is based on the condition of indoor

346. 09-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operationData is based on the condition of indoor

357. 12-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operation65 70 75 80 85 90 95 100 105 110 115110120

368. 15-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operation65 70 75 80 85 90 95 100 105 110 115120130

379. 18-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA)(1) COOL operation(2) HEAT operation65 70 75 80 85 90 95 100

3810. 24-class unit in single operation (OUTDOOR UNIT : MXZ-4B36NA)(1) COOL operation65 70 75 80 85 90 95 100 105 110 115130140150160170180Ambient tem

39SERVICE FUNCTIONS10ACTUATOR CONTROL9Relation between main sensor and actuatorMXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NADischarge temperature the

4SPECIFICATION3ItemOutdoor modelIndoor type Non-Duct (09+09) Duct (09+12)CapacityPowerconsumptionEERSEERHSPF IV (V)COPExternal finishPower supplyMax.

4010-2. AUTO LINE CORRECTING <MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA>Outdoor unit has an auto line correcting function which automaticallydetects an

41113. Troubleshooting procedure1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormal-ity.

42The left lamp of OPERATION INDICATORlamp (Indoor unit)OFF2-time flash3-time flash4-time flash5-time flash6-time flash7-time flash8-time flashLightin

43Operation startCheck the outdoor unit LED indicator.Refer to 11-6. "Check of power supply".• Indoor unit serial signal errorRefer to 11-

4411-4. TROUBLESHOOTING CHECK TABLE LED2LED1Outdoor electronic control P.C. board (Parts side)LightingLED1LED2LightingLED1(Red) LED2(Yellow)Lighting T

45Primary current protectionSecondary current protectionHigh-pressure protectionDefrosting in cooling3 timesLightingDischarge temperatureprotection• C

4611-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NANormalDischarge temperaturethermistor (RT62)Fin temperaturetherm

47 Check of power supplyOutdoor unit does not operate. Turn ON the power supply.NoYesYesNoYesNoYesNoReplace the power board.Check the main power sup

48Is there rated voltage in the power supply ?Is there any mis-wiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire ? 1

49 Check of R.V. coilNoYesNoYesNoYesNoYesNoYes1. Disconnect the lead wire leading to the compressor.2. 3 minutes after turning ON the power supply,

5ItemOutdoor modelIndoor type Non-Duct (06+06+09)MXZ-3B24NAMXZ-3B24NA - 1Duct (09+09+09)CapacityPowerconsumptionEERSEERHSPF IV (V)COPExternal finishP

50 Check of LEVNoYesNoYesTurn ON the power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely.Is "click - c

51 How to check inverter/compressor• When heating, room does not get warm.• When cooling, room does not get cool.NoNoYesYesYesNoYesNoDisconnect the

52 Check of outdoor thermistors• When thermistor is abnormal. ThermistorDefrostDischarge temperatureOutdoor heat exchanger temperature Ambient tempe

53 The other casesIndoor unit does not operate. (different operating models in multi system)• When you try to run two indoor units simultaneously,

547006005004003002001000Resistance (kΩ)Temperature (°F)Discharge temperature thermistor (RT62)3250 68 86 104 122 140 158 176 194 212 230 248-4 14 32 5

55MXZ-3B24NA MXZ-3B30NA MXZ-4B36NALED 1LED 2F931FUSET3.15AL250V(CN93220-90 V ACGND5 V DC5 V DCpulse wave(To fanmotor(+)(–)Rush current relay (–)R.V.

562. Noise filter P.C. board208/230 V ACOutputF64 FUSET2AL250V{{CN901To electroniccontrol P.C. boardCN912R.V. coil208/230 V AC{CN902To powerboardCN903

57MXZ-2B20NA3. Outdoor Power board(Red)(White)Connect to the compressorVoltage among phases: 5 V to 180 VConnect to the earthCN5Primary current detect

58MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA(Red)(White)Connect to the compressorVoltage among phases: 5 V to 180 VConnect to the earthCN5Primary current dete

59OPERATING PROCEDUREPHOTOSDISASSEMBLY INSTRUCTIONS12(1) Slide the sleeve and check if there is a locking lever or not.(2) The terminal with this co

6ItemOutdoor modelIndoor type Non-Duct (09+09+12)MXZ-3B30NAMXZ-3B30NA - 1Duct (09+09+12)CapacityPowerconsumptionEERSEERHSPF IV (V)COPExternal finishP

60OPERATING PROCEDUREPHOTOS3. Removing the fan motor(1) Remove the top panel, the service panel, and the cabinet (Photo 1, 2).(2) Disconnect the con

61OPERATING PROCEDURE PHOTOS6. Removing the reactor(1) Remove the top panel (Photo 1).(2) Remove the service panel, cabinet, back panel, and the

62OPERATING PROCEDUREPHOTOS1. Removing the compressor(1) Remove the screws of the top panel, and remove the top panel.(2) Remove the screws of the ser

63OPERATING PROCEDUREPHOTOS3. Removing the 4-way valve(1) Remove the top panel (Photo 1, 2).(2) Remove the service panel, rear panel, and pipe cover

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 t

MXZ-2B20NA MXZ-2B20NA-1 COOLING+PFQQTWPKVU +PFQQTV[RG%QQNKPIECRCEKV[$67J 2QYGTEQPUWORVKQP%WTTGPV#EQODKPCVKQP # $7PKV# 7PKV$ 6QVCN 98 

MXZ-2B20NA MXZ-2B20NA-1 HEATING+PFQQTWPKVU +PFQQTV[RG*GCVKPIECRCEKV[$67J 2QYGTEQPUWORVKQP%WTTGPV#EQODKPCVKQP # $7PKV# 7PKV$ 6QVCN 98 

MXZ-3B24NA MXZ-3B24NA-1 COOLINGIndoor units Indoor type Cooling capacity(BTU/h) Power consumption Current(A)combination A B C Unit A Unit B Unit C Tot

MXZ-3B24NA MXZ-3B24NA-1 COOLINGIndoor units Indoor type Cooling capacity(BTU/h) Power consumption Current(A)combination A B C Unit A Unit B Unit C Tot

MXZ-3B24NA MXZ-3B24NA-1 HEATINGIndoor units Indoor type Heating capacity(BTU/h) Power consumption Current(A)combination A B C Unit A Unit B Unit C Tot

7ItemOutdoor modelIndoor typeNon-Duct (09+09+09+09)MXZ-4B36NAMXZ-4B36NA - 1Duct (09+09+09+09)CapacityPowerconsumptionEERSEERHSPF IV (V)COPExternal fi

MXZ-3B24NA MXZ-3B24NA-1 HEATINGIndoor units Indoor type Heating capacity(BTU/h) Power consumption Current(A)combination A B C Unit A Unit B Unit C Tot

MXZ-3B30NA MXZ-3B30NA-1 COOLINGIndoor units Indoor typeCooling capacity(BTU/h) Power consumptionCurrent(A)combination A B CUnit A Unit B Unit C Total

MXZ-3B30NA MXZ-3B30NA-1 COOLINGIndoor units Indoor typeCooling capacity(BTU/h) Power consumptionCurrent(A)combination A B CUnit A Unit B Unit C Total

MXZ-3B30NA MXZ-3B30NA-1 COOLINGIndoor units Indoor typeCooling capacity(BTU/h) Power consumptionCurrent(A)combination A B CUnit A Unit B Unit C Total

MXZ-3B30NA MXZ-3B30NA-1 HEATINGIndoor units Indoor typeHeating capacity(BTU/h) Power consumptionCurrent(A)combination A B CUnit A Unit B Unit C Total

MXZ-3B30NA MXZ-3B30NA-1 HEATINGIndoor units Indoor typeHeating capacity(BTU/h) Power consumptionCurrent(A)combination A B CUnit A Unit B Unit C Total

MXZ-3B30NA MXZ-3B30NA-1 HEATINGIndoor units Indoor typeHeating capacity(BTU/h) Power consumptionCurrent(A)combination A B CUnit A Unit B Unit C Total

MXZ-4B36NA COOLINGIndoor units Indoor type Cooling capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA COOLINGIndoor units Indoor type Cooling capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA COOLINGIndoor units Indoor type Cooling capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

890807060504030201063 125 250 500 1000 2000 4000 8000APPROXIMATETHRESHOLD OFHEARING FORCONTINUOUSNOISENC-60NC-50NC-40NC-30NC-20NC-70OCTAVE BAND SOUND

MXZ-4B36NA COOLINGIndoor units Indoor type Cooling capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA COOLINGIndoor units Indoor type Cooling capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA HEATINGIndoor units Indoor type Heating capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA HEATINGIndoor units Indoor type Heating capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA HEATINGIndoor units Indoor type Heating capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA HEATINGIndoor units Indoor type Heating capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA HEATINGIndoor units Indoor type Heating capacity(BTU/h) Power consumption Current(A)combination ABCDUnit A Unit B Unit C Unit D Total (W) 2

MXZ-4B36NA-1 COOLINGIndoor units Indoor typeCooling capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

MXZ-4B36NA-1 COOLINGIndoor units Indoor typeCooling capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

MXZ-4B36NA-1 COOLINGIndoor units Indoor typeCooling capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

9OUTLINES AND DIMENSIONS5MXZ-2B20NAUnit: inchLock nutConnectorGrounding terminalConduitcoverNote : Leave front and both sides free of obstru

MXZ-4B36NA-1 COOLINGIndoor units Indoor typeCooling capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

MXZ-4B36NA-1 COOLINGIndoor units Indoor typeCooling capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

MXZ-4B36NA-1 HEATINGIndoor units Indoor typeHeating capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

MXZ-4B36NA-1 HEATINGIndoor units Indoor typeHeating capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

MXZ-4B36NA-1 HEATINGIndoor units Indoor typeHeating capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

MXZ-4B36NA-1 HEATINGIndoor units Indoor typeHeating capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208

MXZ-4B36NA-1 HEATINGIndoor units Indoor typeHeating capacity(BTU/h) Power consumptionCurrent(A)combination ABCDUnit A Unit B Unit C Unit DTotal(W) 208