Mitsubishi Electric MXZ-2C20NAHZ Page 80 Service Manual Download | Manualshive

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80

Check of outdoor thermistors

• When thermistor is abnormal.

Thermistor

Defrost
Discharge temperature
Outdoor heat exchanger temperature
Ambient temperature
Fin temperature

Symbol

RT61
RT62
RT68
RT65
RT64

Connector, Pin No.

Between CNTH1 pin1 and pin2
Between CNTH1 pin3 and pin4
Between CNTH1 pin7 and pin8
Between CNTH2 pin1 and pin2
Between CN171 pin1 and pin2

Outdoor control P.C. board

Outdoor power P.C. board

Board

Normal

Yes

No

Abnormal

Disconnect 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?

Normal

Replace the outdoor control P.C. board or the
outdoor power P.C. 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.

(MXZ-3C24/3C30/4C36NA,
MXZ-3C24/3C30/4C36NA2)

Replace the thermistor.

(MXZ-5C42NA,MXZ-5C42NA2,
MXZ-2C20/3C24/3C30NAHZ,
MXZ-2C20/3C24/3C30NAHZ2)

Replace the thermistor except RT64.
If RT64 is abnormal, replace the outdoor power
P.C. board since RT64 is combined with this board.

OBH702E

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Summary of Contents for MXZ-2C20NAHZ

Page 1: ...eries OBH542 MSZ GE NA Series OBH548 MFZ KA NA Series OBH568 SEZ KD NA Series PLA A BA Series OCH420 PCA A KA Series OCH455 PEAD A AA Series SLZ KA NA Series OCH487 MSZ FH NA Series OBH683 MVZ A AA Series MSZ GL NA Series OBH732 MSZ EF NA Series OBH736 MFZ KJ NA Series OBH752 MXZ 3C24NA MXZ 3C24NA2 MXZ 3C30NA MXZ 3C30NA2 MXZ 4C36NA MXZ 4C36NA2 CONTENTS 1 TECHNICAL CHANGES 5 2 PART NAMES AND FUNCTI...

Page 2: ...al failure system malfunction unit breakdown or accidents caused by failure to follow the instructions Revision A MXZ 3C24NA MXZ 3C30NA and MXZ 4C36NA have been added Revision B MXZ 3C24 3C30 4C36 5C42NA2 and MXZ 2C20 3C24 3C30NAHZ2 U1 have been added Revision C 3 SPECIFICATION has been changed Some descriptions have been modified Revision D Connectable indoor unit lineups have been modified WIRIN...

Page 3: ...Ɣ Ɣ Ɣ Ceiling concealed Ceiling concealed Wall mounted Wall mounted Floor standing Floor standing 4 way cassette 4 way cassette Model type Model name Capacity class kBTU h Model type Model name Capacity class kBTU h 4 way cassette 4 way cassette Ceiling concealed Ceiling concealed Connectable indoor unit lineups Heat pump inverter type Connectable indoor unit lineups Heat pump inverter type Connec...

Page 4: ... Ɣ MSZ FH NA Ɣ Ɣ Ɣ MSZ FH NA Ɣ Ɣ Ɣ Ɣ MSZ GE NA Ɣ Ɣ Ɣ Ɣ MSZ GE NA Ɣ Ɣ Ɣ Ɣ MSZ GL NA Ɣ Ɣ Ɣ Ɣ MSZ GL NA Ɣ Ɣ Ɣ Ɣ MSZ EF NA MSZ EF NA Ɣ Ɣ Ɣ MFZ KA NA Ɣ Ɣ MFZ KA NA Ɣ Ɣ MFZ KJ NA MFZ KJ NA Ɣ Ɣ Ɣ SLZ KA NA Ɣ Ɣ SLZ KA NA Ɣ Ɣ PLA A BA PLA A BA SEZ KD NA Ɣ Ɣ Ɣ SEZ KD NA Ɣ Ɣ Ɣ PEAD A AA PEAD A AA Ceiling suspended PCA A KA Ceiling suspended PCA A KA Multi position MVZ A AA4 Ɣ Multi position MVZ A AA4 Ɣ Ceili...

Page 5: ... 3C24NA MXZ 3C30NA MXZ 4C36NA 1 New model MXZ 3C24NA MXZ 3C24NA2 U1 MXZ 3C30NA MXZ 3C30NA2 U1 MXZ 4C36NA MXZ 4C36NA2 U1 MXZ 5C42NA MXZ 5C42NA2 U1 MXZ 2C20NAHZ MXZ 2C20NAHZ2 U1 MXZ 3C24NAHZ MXZ 3C24NAHZ2 U1 MXZ 3C30NAHZ MXZ 3C30NAHZ2 U1 1 Outdoor control P C board has been changed OBH702E ...

Page 6: ...MXZ 2C20NAHZ MXZ 2C20NAHZ2 MXZ 3C24NAHZ MXZ 3C24NAHZ2 MXZ 3C30NAHZ MXZ 3C30NAHZ2 MXZ 3C24NA MXZ 3C24NA2 MXZ 3C30NA MXZ 3C30NA2 MXZ 4C36NA MXZ 4C36NA2 Air outlet Drain outlet Air inlet Back and side Air outlet Drain outlet Air inlet Back and side OBH702E ...

Page 7: ...by built in transformer 12 24 VDC Refrigerant piping Not supplied optional parts Valve size Liquid in 1 4 Gas in A 1 2 B C 3 8 Connection method Indoor Flared Outdoor Flared Refrigerant charge R410A lb 6lb 13oz Refrigeration oil Model fl oz L 23 7 0 7 FV50S Unit F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated comp...

Page 8: ... in transformer 12 24 VDC Refrigerant piping Not supplied optional parts Valve size Liquid in 1 4 Gas in A 1 2 B C 3 8 Connection method Indoor Flared Outdoor Flared Refrigerant charge R410A lb 6lb 13oz Refrigeration oil Model fl oz L 23 7 0 7 FV50S Unit F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated compressor s...

Page 9: ...lt in transformer 12 24 VDC Refrigerant piping Not supplied optional parts Valve size Liquid in 1 4 Gas in A 1 2 B C D 3 8 Connection method Indoor Flared Outdoor Flared Refrigerant charge R410A lb 6lb 13oz Refrigeration oil Model fl oz L 23 7 0 7 FV50S Unit F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated compress...

Page 10: ...e by built in transformer 12 24 VDC Refrigerant piping Not supplied optional parts Valve size Liquid in 1 4 Gas in A 1 2 B C D E 3 8 Connection method Indoor Flared Outdoor Flared Refrigerant charge R410A lb 8 lb 13 oz Refrigeration oil Model fl oz L 37 2 1 1 FV50S Unit F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at ra...

Page 11: ...by built in transformer 12 24 VDC Refrigerant piping Not supplied optional parts Valve size Liquid in 1 4 Gas in A B 3 8 Connection method Indoor Flared Outdoor Flared Refrigerant charge R410A lb 8 lb 13 oz Refrigeration oil Model fl oz L 37 2 1 1 FV50S Unit F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated compress...

Page 12: ... by built in transformer 12 24 VDC Refrigerant piping Not supplied optional parts Valve size Liquid in 1 4 Gas in A 1 2 B C 3 8 Connection method Indoor Flared Outdoor Flared Refrigerant charge R410A lb 8 lb 13 oz Refrigeration oil Model fl oz L 37 2 1 1 FV50S Unit F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated c...

Page 13: ... by built in transformer 12 24 VDC Refrigerant piping Not supplied optional parts Valve size Liquid in 1 4 Gas in A 1 2 B C 3 8 Connection method Indoor Flared Outdoor Flared Refrigerant charge R410A lb 8 lb 13 oz Refrigeration oil Model fl oz L 37 2 1 1 FV50S Unit F Mode Test Indoor air condition Outdoor air condition Dry bulb Wet bulb Dry bulb Wet bulb Cooling 1 A Cooling steady state at rated c...

Page 14: ...Z 4C36NA2 MXZ 3C30NA MXZ 3C30NA2 Cooling High FUNCTION FAN SPEED Heating High 52 SPL dB A 56 LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL 0dB 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz Cooling High FUNCTION FAN SPEED Heating High 51 SPL dB A 55 LINE 90 8...

Page 15: ...NCIES Hz Cooling High FUNCTION FAN SPEED Heating High 54 SPL dB A 58 LINE MXZ 3C24NAHZ MXZ 3C24NAHZ2 MXZ 3C30NAHZ MXZ 3C30NAHZ2 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL 0dB 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz Cooling High FUNCTION FAN SPEED Heating...

Page 16: ...16 MXZ 3C24NA MXZ 3C24NA2 MXZ 3C30NA MXZ 3C30NA2 Unit inch mm OUTLINES AND DIMENSIONS 5 Lock nut Conduit plates Conduit connector OBH702E ...

Page 17: ...17 MXZ 4C36NA MXZ 4C36NA2 Unit inch mm Lock nut Conduit plates Conduit connector OBH702E ...

Page 18: ...18 MXZ 5C42NA MXZ 5C42NA2 Unit inch mm Lock nut Conduit connector Conduit plate Under Conduit plate Top OBH702E ...

Page 19: ...19 MXZ 2C20NAHZ MXZ 2C20NAHZ2 Unit inch mm Lock nut Conduit connector Conduit plate OBH702E ...

Page 20: ...20 MXZ 3C24NAHZ MXZ 3C24NAHZ2 MXZ 3C30NAHZ MXZ 3C30NAHZ2 Unit inch mm Lock nut Conduit connector Conduit plate Under Conduit plate Top OBH702E ...

Page 21: ...21 MXZ 3C24NA MXZ 3C30NA WIRING DIAGRAM 6 OBH702E ...

Page 22: ...22 MXZ 3C24NA2 MXZ 3C30NA2 OBH702E ...

Page 23: ...23 MXZ 4C36NA OBH702E ...

Page 24: ...24 MXZ 4C36NA2 OBH702E ...

Page 25: ... BOARD BLU CN793 WHT CN791 1 5 1 5 RED CN792 1 5 X712 X714 CN712 CN714 2 1 2 1 X713 CN713 2 1 21S4 21S2 LEV C LEV B LEV A 5 5 5 M M CN611 CN601 CN63H 2 1 1 5 1 3 ORN GRY YLW WHT RED BLU BLK HPS CN622 1 5 YLW CN794 1 5 BLK CN795 1 5 M LEV D 5 M LEV E 5 M MS 3 MS 3 TB5 S2 S3 S1 YLW BLU BLK 12 24V 208 230V TO INDOOR UNIT No D TB6 S2 S3 S1 GRY BLU BLK 12 24V 208 230V TO INDOOR UNIT No E SYMBOL CB1 4 D...

Page 26: ...26 MXZ 5C42NA2 OBH702E ...

Page 27: ...27 MXZ 2C20NAHZ OBH702E ...

Page 28: ...28 MXZ 2C20NAHZ2 OBH702E ...

Page 29: ...29 MXZ 3C24NAHZ MXZ 3C30NAHZ OBH702E ...

Page 30: ...30 MXZ 3C24NAHZ2 MXZ 3C30NAHZ2 OBH702E ...

Page 31: ... LEVA Distributor Stop valve with service port Capillary tube Capillary tube O D 0 16 x I D 0 11 x 3 94 Ø4 0 x Ø2 8 x 100 Strainer 100 Union Union Header Gas Stop valve Strainer 100 Header Evaporator Service port ĭ1 4 ĭ3 8 Sub muffler Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Compressor shell temperature thermistor RT62 Defrost temperature thermistor RT...

Page 32: ...nit 25 MAX Total bending point 70 MAX It is irrelevant which unit is higher MAX REFRIGERANT PIPING LENGTH PIPE SIZE SELECTION MXZ 3C24NA MXZ 3C30NA MXZ 3C24NA2 MXZ 3C30NA2 Operating Range MXZ 3C24NA MXZ 3C30NA MXZ 3C24NA2 MXZ 3C30NA2 a b Outdoor unit Indoor units Max height difference 49 ft 49 ft c 49 ft Outdoor unit union diameter For Indoor unit A Liquid 1 4 Gas 1 2 Indoor unit B Liquid 1 4 Gas ...

Page 33: ...pressor shell temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Defrost temperature thermistor RT61 Capillary tube O D 0 16 x I D 0 11 x 3 94 Ø4 0 x Ø2 8 x 100 Indoor unit A Indoor unit D Indoor unit C Indoor unit B 4 way valve Service port Service port Stop valve with service port Indoor unit A Indoor unit D Indoor unit C Indoor uni...

Page 34: ... each unit 25 MAX Total bending point 70 MAX It is irrelevant which unit is higher MAX REFRIGERANT PIPING LENGTH PIPE SIZE SELECTION MXZ 4C36NA MXZ 4C36NA2 Operating Range MXZ 4C36NA MXZ 4C36NA2 a b c d Outdoor unit Indoor units 49 ft 49 ft 49 ft Max height difference Outdoor unit union diameter For Indoor unit A Liquid 1 4 Gas 1 2 Indoor unit B Liquid 1 4 Gas 3 8 Indoor unit C Liquid 1 4 Gas 3 8 ...

Page 35: ... unit D Indoor unit E Strainer 100 Strainer 100 Strainer 100 Strainer 100 LEV B LEV E LEV D LEV C R V coil OFF Refrigerant flow in heating ON Refrigerant flow in cooling Compressor Oil separator High pressure switch Ø1 4 Ø1 4 Ø3 8 Ø1 2 Indoor unit A Accumulator Ø1 4 LEV A Ø3 8 2 way solenoid valve Sub muffler Distributor Strainer 100 Union Union Header Gas Stop valve Strainer Strainer 50 Strainer ...

Page 36: ...r unit D Liquid 1 4 Gas 3 8 Indoor unit E Liquid 1 4 Gas 3 8 Operating Range MXZ 5C42NA MXZ 5C42NA2 Piping length each indoor unit a b c d e 82 ft MAX Total piping length a b c d e 262 ft MAX Bending point for each unit 25 MAX Total bending point 80 MAX It is irrelevant which unit is higher MAX REFRIGERANT PIPING LENGTH PIPE SIZE SELECTION MXZ 5C42NA MXZ 5C42NA2 Unit inch a b e c d Outdoor unit In...

Page 37: ...Indoor unit A Indoor unit B Indoor unit A Indoor unit B Strainer 100 LEV B Strainer 50 Strainer 50 R V coil OFF Refrigerant flow in heating ON Refrigerant flow in cooling Compressor Oil separator High pressure switch Ø Sub muffler 4 way valve 3 8 Ø3 8 Accumulator Ø1 4 LEV A 2 way solenoid valve Distributor Strainer 100 Union Union Header Gas Stop valve Strainer 100 Header Evaporator Ø1 4 Outdoor h...

Page 38: ...NAHZ2 Operating Range MXZ 2C20NAHZ MXZ 2C20NAHZ2 Outdoor unit union diameter For Indoor unit A Liquid 1 4 Gas 3 8 Indoor unit B Liquid 1 4 Gas 3 8 Piping length each indoor unit a b 82 ft MAX Total piping length a b 164 ft MAX Bending point for each unit 25 MAX Total bending point 50 MAX It is irrelevant which unit is higher a b Outdoor unit Indoor units 49 ft 49 ft 49 ft Max height difference Ind...

Page 39: ...xchanger Indoor unit B Indoor unit C Indoor unit A Strainer 100 Strainer 100 LEV B LEV C Strainer 50 Strainer 50 R V coil OFF Refrigerant flow in heating ON Refrigerant flow in cooling Compressor Oil separator High pressure switch Ø1 4 Ø1 2 Accumulator Ø1 4 LEV A Ø3 8 2 way solenoid valve Distributor Strainer 100 Union Union Header Gas Stop valve Strainer 100 Header Evaporator Ø1 4 Ø3 8 Compressor...

Page 40: ...X Total bending point 70 MAX It is irrelevant which unit is higher MAX REFRIGERANT PIPING LENGTH PIPE SIZE SELECTION MXZ 3C24NAHZ MXZ 3C30NAHZ MXZ 3C24NAHZ2 MXZ 3C30NAHZ2 Operating Range MXZ 3C24NAHZ MXZ 3C30NAHZ MXZ 3C24NAHZ2 MXZ 3C30NAHZ2 a b Outdoor unit Indoor units Max height difference 49 ft 49 ft c 49 ft Outdoor unit union diameter For Indoor unit A Liquid 1 4 Gas 1 2 Indoor unit B Liquid 1...

Page 41: ...r unit installation manual about the method for stopping the operation If too much refrigerant has been added to the air conditioner system the pressure may not drop to 0 1 to 0 psi Gauge 0 05 to 0 MPa or the protection function may operate due to the pressure increase in the high pressure refrigerant cir cuit If this occurs use a refrigerant collecting device to collect all of the refrigerant in ...

Page 42: ...re DB ºF 95 47 95 47 WB ºF 43 43 Fan speed rpm 720 750 720 750 Airflow CFM 2 287 2 382 2 287 2 382 Model MXZ 3C30NA MXZ 3C30NA2 Indoor type Non Duct 09 09 12 Duct 09 09 12 Item Unit Cooling Heating Cooling Heating Total Capacity Btu h 28 400 28 600 27 400 27 600 SHF Input kW 2 68 2 15 2 84 2 22 Electrical circuit Power supply V phase Hz 208 230 1 60 Input kW 2 614 2 084 2 650 2 090 Comp current 20...

Page 43: ...9 16 09 14 13 12 78 Fan motor current A 0 3 0 3 0 3 0 3 Refrigerant circuit Condensing pressure PSIG 461 297 470 334 Suction pressure PSIG 141 89 129 91 Discharge temperature ºF 172 138 176 147 Condensing temperature ºF 127 95 129 103 Suction temperature ºF 51 28 46 29 Comp shell bottom temp ºF 162 130 165 139 Ref pipe length Total pipe length for multi system ft 25 100 Refrigerant charge R410A 6 ...

Page 44: ...95 47 95 47 WB ºF 43 43 Fan speed rpm 630 730 630 730 Airflow CFM 2 118 2 542 2 118 2 542 Model MXZ 5C42NA MXZ 5C42NA2 Indoor type Non Duct 06 09 09 09 09 Duct 09 09 09 09 09 Item Unit Cooling Heating Cooling Heating Total Capacity Btu h 40 500 45 000 37 500 41 000 SHF Input kW 4 41 3 58 4 17 3 47 Electrical circuit Power supply V phase Hz 208 230 1 60 Input kW 4 300 3 465 3 870 3 270 Comp current...

Page 45: ... DB ºF 95 47 95 47 WB ºF 43 43 Fan speed rpm 630 730 630 730 Airflow CFM 2 118 2 542 2 118 2 542 Model MXZ 3C30NAHZ MXZ 3C30NAHZ2 Indoor type Non Duct 09 09 12 Duct 09 09 12 Item Unit Cooling Heating Cooling Heating Total Capacity Btu h 28 400 28 600 27 400 27 600 SHF Input kW 2 28 2 10 2 67 2 19 Electrical circuit Power supply V phase Hz 208 230 1 60 Input kW 2 214 2 031 2 480 2 060 Comp current ...

Page 46: ...eed Max temperature heating at minimum compressor speed High temperature heating at minimum compressor speed Frost accumulation at rated compressor speed Frost accumulation at intermediate compressor speed 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 te...

Page 47: ...fference between the indoor intake air wet and dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at service Cooling Heating How to measure the indoor air wet and dry bulb temperature difference 1 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...

Page 48: ...e F Indoor intake air Wet bulb temperature F Outdoor intake air Wet bulb temperature F Indoor air Wet bulb temperature difference F 15 class 06 class 12 class 09 class 24 class 18 class Indoor air Wet bulb temperature difference F 15 class 06 class 12 class 09 class 24 class 18 class Outdoor intake air Wet bulb temperature F 68 79 59 Heating capacity Input correction factors Total input Heating 3 ...

Page 49: ...re F Outdoor intake air Wet bulb temperature F Indoor air Wet bulb temperature difference F 15 class 06 class 12 class 09 class 24 class 18 class Indoor air Wet bulb temperature difference F 15 class 06 class 12 class 09 class 24 class 18 class Outdoor intake air Wet bulb temperature F 68 79 59 Heating capacity Input correction factors Total input Heating 3 19 43 11 27 35 51 0 9 1 0 1 1 1 2 1 3 59...

Page 50: ...door intake air Wet bulb temperature F Outdoor intake air Wet bulb temperature F Indoor air Wet bulb temperature difference F 15 class 06 class 12 class 09 class 24 class 18 class Outdoor intake air Wet bulb temperature F Indoor air Wet bulb temperature difference F 15 class 06 class 12 class 09 class 24 class 18 class 68 79 59 Heating capacity Input correction factors Total input Heating 14 2 26 ...

Page 51: ...Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 HEAT Capacity HEAT Total input Frequency Hz Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 COOL Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 COOL Total input Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 COOL Total input Frequency Hz HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50...

Page 52: ...city HEAT Total input Frequency Hz Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 COOL Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 COOL Total input Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 COOL Total input Frequency Hz HEAT Capacity Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 0 50 100 150 0 5 1 0 1 5 2 0 HEAT Total input Frequency Hz COOL ...

Page 53: ...30NA MXZ 4C36NA MXZ 3C24NA2 MXZ 3C30NA2 MXZ 4C36NA2 1 COOL operation 8 4 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT Data is based on the condition of indoor humidity 50 Air flow speed High Inverter 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 Compres...

Page 54: ...OR UNIT MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 3C24NA2 MXZ 3C30NA2 MXZ 4C36NA2 1 COOL operation Data is based on the condition of indoor humidity 50 Air flow speed High Inverter output frequency 24 Hz 2 HEAT operation 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...

Page 55: ...ion OUTDOOR UNIT MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 3C24NA2 MXZ 3C30NA2 MXZ 4C36NA2 1 COOL operation Air flow speed High Inverter 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 switc...

Page 56: ... Hz 65 70 75 Indoor Dry bulb temperature F Indoor Dry bulb temperature F Indoor Dry bulb temperature F 2 HEAT operation 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 High Inverter output frequency 24 Hz Data is based on the condition of indoor humidity 50 How to work fixed frequency operation 1 Set emergency switc...

Page 57: ... A 32 Hz 24 Hz 24 Hz 65 70 75 Indoor Dry bulb temperature F Indoor Dry bulb temperature F Indoor Dry bulb 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 High Inverter output frequency 24 Hz Data is based on the condition of indoor humidity 50 How to work fixed frequency operation 1 Set emergency switc...

Page 58: ...bulb temperature F Indoor Dry bulb temperature F Indoor Dry bulb temperature F 86 80 75 70 2 HEAT operation 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 High Inverter 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...

Page 59: ... 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 95 100 105 110 115 120 130 140 150 160 170 PELHQW WHPSHUDWXUH Û Û QGRRU U EXOE WHPSHUDWXUH Û 65 70 75 80 85 90 95 100 105 110 115 0 0 1 0 2 0 3 0 4 0 5 0 6 0 PELHQW WHPSHUDWXUH Û Û Û 15 20 25 30 35 40 45 50 55 60 65 70 75 2 0 3 0 4 0 5 0 6 0 ...

Page 60: ... 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 95 100 105 110 115 120 130 140 150 160 170 PELHQW WHPSHUDWXUH Û Û QGRRU U EXOE WHPSHUDWXUH Û 65 70 75 80 85 90 95 100 105 110 115 0 0 1 0 2 0 3 0 4 0 5 0 6 0 PELHQW WHPSHUDWXUH Û Û Û 15 20 25 30 35 40 45 50 55 60 65 70 75 2 0 3 0 4 0 5 0 6 0 ...

Page 61: ... 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 95 100 105 110 115 120 130 140 150 160 170 PELHQW WHPSHUDWXUH Û Û QGRRU U EXOE WHPSHUDWXUH Û 65 70 75 80 85 90 95 100 105 110 115 0 0 1 0 2 0 3 0 4 0 5 0 6 0 PELHQW WHPSHUDWXUH Û Û Û 15 20 25 30 35 40 45 50 55 60 65 70 75 2 0 3 0 4 0 5 0 6 0 ...

Page 62: ...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 95 100 105 110 115 120 130 140 150 170 180 160 PELHQW WHPSHUDWXUH Û Û QGRRU U EXOE WHPSHUDWXUH Û 65 70 75 80 85 90 95 100 105 110 115 0 0 1 0 2 0 3 0 4 0 5 0 6 0 PELHQW WHPSHUDWXUH Û Û Û 15 20 25 30 35 40 45 50 55 60 65 70 75 2 0 3 0 4 0 5 0 6...

Page 63: ...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 95 100 105 110 115 120 130 140 150 170 180 160 PELHQW WHPSHUDWXUH Û Û QGRRU U EXOE WHPSHUDWXUH Û 65 70 75 80 85 90 95 100 105 110 115 0 0 1 0 2 0 3 0 4 0 5 0 6 0 PELHQW WHPSHUDWXUH Û Û Û 15 20 25 30 35 40 45 50 55 60 65 70 75 2 0 3 0 4 0 5 0 6 0 7 0 PELHQW ...

Page 64: ...tinues 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 95 100 105 110 115 130 140 150 170 190 200 160 180 PELHQW WHPSHUDWXUH Û Û QGRRU U EXOE WHPSHUDWXUH Û 65 70 75 80 85 90 95 100 105 110 115 0 0 1 0 2 0 3 0 4 0 5 0 6 0 PELHQW WHPSHUDWXUH Û Û Û 15 20 25 30 35 40 45 50 55 60 65 70 75 2 0 3 0 4 0 5 0 6 0 7 0 PELHQW WHP...

Page 65: ...NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ MXZ 5C42NA2 MXZ 2C20NAHZ2 MXZ 3C24NAHZ2 MXZ 3C30NAHZ2 MXZ 2C20NAHZ MXZ 3C24NAHZ MXZ 3C30NAHZ MXZ 2C20NAHZ2 MXZ 3C24NAHZ2 MXZ 3C30NAHZ2 Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pres sure protection Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Ambient tempera...

Page 66: ...l 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 4 of SW2 on the outdoor control P C board to ON to deactivate pre heat control function Turn ON the power supply for the air conditioner NOTE Pre heat control will be turned OFF when the breaker is turned OFF SERVICE FUNCTIONS 10 MXZ 3C24NA MXZ 3C30NA MX...

Page 67: ...d Operate indoor unit after the auto line correcting is finished Pressing the switch during detection cancels this function Make sure that the valves are open and the pipes are not collapsed or clogged LED indication after cancel LED1 Red Lighted LED indication during detection LED indication after detection LED2 Yellow Lighted LED3 Green Once LED1 Red Lighted LED2 Yellow Lighted LED3 Green Not li...

Page 68: ...e 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 outdoor 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...

Page 69: ...3 With the remote controller headed towards the indoor unit press the TEM PERATURE buttons to adjust the set temperature to 77 F 25 C 1 1 Regardless of normal or abnormal condition 2 short beeps are emitted as the signal is received The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the table of outdoor unit failure mode recall function 11 2 3 M...

Page 70: ...0 F MXZ 3C24 3C30 4C36NA MXZ 3C24 3C30 4C36NA2 192 F MXZ 2C20 3C24 3C30NAHZ 5C42NA MXZ 2C20 3C24 3C30 NAHZ2 5C42NA2 during operation Check around outdoor unit Check outdoor unit air passage Refer to 11 6 Check of outdoor fan motor P C board temperature 4 times Not lighted The P C board temperature exceeds 152 F MXZ 3C24 3C30 4C36NA MXZ 3C24 3C30 4C36NA2 189 F MXZ 2C20 3C24 3C30 NAHZ 5C42NA MXZ 2C2...

Page 71: ...ating indoor unit gets warm Refer to 11 6 Check of LEV KHQ KHDWLQJ room does not get warm Refer to 11 6 How to check inverter compressor KHFN PLV SLSLQJ shortage of capacity KHQ FRROLQJ dew drops in the non operating indoor unit Check of miss piping Refer to 11 4 Troubleshooting check table Both LED1 and LED2 are OFF Both LED1 and LED2 are lighting LED1 or LED2 has blinked 11 3 INSTRUCTION OF TROU...

Page 72: ...r terminal bed 10 Lighted 12 times Zero cross detecting circuit The protection cut out of the zero cross detecting circuit operates 10 consecutive times Check the connecting wire among outdoor control P C board and outdoor power P C board 11 Lighted 13 times Current sensor A short or open circuit is detected in the input cur rent detection circuit during operation Replace the outdoor power P C boa...

Page 73: ...door heat exchanger temperature exceeds 136 4 F during operation This symptom does not mean any abnormality of the product 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 31 7 times Lighted High Low Pressure bypass valve Cooling evaporating temperature drop prevention control During coolin...

Page 74: ...sistance 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 control P C board for the chart of thermistor MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 3C24NA2 MXZ 3C30NA2 MXZ 4C36NA2 MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 3C24NA2 MXZ 3C30NA2 MXZ 4C36NA2 Normal Each phase N N Normal Each phase Measure the resistance betwee...

Page 75: ...proper connections Is there voltage of 208 230 V AC in the power supply terminal block Is the output voltage from the outdoor power P C board 294 325 V DC Check the power supply cable Replace the outdoor power P C board Turn OFF the power supply and recconnect the reactor Is the reactor short circuited Replace the reactor Replace the outdoor control P C board OBH702E ...

Page 76: ... smoothing capacitor Replace the outdoor control P C board 2 Is there any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block Replace the indoor outdoor connecting wire Is serial signal error indicated 6 minutes later Yes No Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON ag...

Page 77: ... control P C board Replace the R V coil Is there voltage 208 230 V AC between the pin1 and pin3 at connector CNAC Replace the outdoor power P C board 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 HEAT mode Is there voltage of 208 230 V AC between pin1 and pin2 at c...

Page 78: ...and Disconnect the connectors CN791 LEV A CN792 LEV B CN793 LEV C MXZ 3C 4C 5C CN794 LEV D MXZ 4C 5C CN795 LEV E MXZ 5C Is there normal resistance to LEV coil Refer to 11 5 Normal Replace the outdoor control P C board Replace LEV coil When cooling heat exchanger of non operating indoor unit frosts When heating non operating indoor unit gets warm CN791 CN792 CN793 CN794 CN795 Outdoor control P C bo...

Page 79: ...essor winding resistance between the compressor terminals Is the resistance between each terminal normal Refer to 11 5 Is the input voltage to the outdoor control P C board 370 V DC 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 outdoor power P C board IWHU WKH RXWGRR...

Page 80: ...e 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 Normal Replace the outdoor control P C board or the outdoor power P C 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 ...

Page 81: ...to pin4 To measure the voltage connect the negative end of the tester to pin4 Voltage between pin4 and 6 should be measured within 1 minute after the operation starts pin1 pin4 pin5 pin4 pin6 pin4 pin7 pin4 Voltage 15 V DC 294 325 V DC 1 5 V DC CNF1 pin1 pin4 pin5 pin4 pin6 pin4 Is the voltage of connector CNF1 normal Refer to right table Does the voltage between pin7 and pin4 of connector CNF1 re...

Page 82: ...ation lamp on the outdoor control P C board Replace the outdoor power P C board Blink 9 times Replace the outdoor control P C board Turn OFF power supply before removing P C board Confirm LED1 indication lamp on the outdoor control P C board Turn ON power supply Start operation Lighting Replace the outdoor control P C board Blink 9 times Replace the outdoor power P C board Confirm LED1 indication ...

Page 83: ...erature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 CNTH1 CNTH2 Ambient temperature thermistor RT65 SW1 LED3 LEV 12 V DC pulse wave LED2 LED1 SW2 SW871 CN712 R V coil 208 230 V AC Output CN713 Valve coil 208 230 V AC Output CN714 Base heater 208 230 V AC Output CNAC to outdoor power P C board 208 230 V AC Input F711 FUSE T3 15AL250V CN611 Serial signal 12 24 V CN621 CN701 Si...

Page 84: ...ger temperature thermistor RT68 CNTH1 CNTH2 Ambient temperature thermistor RT65 SW1 LED3 LEV 12 V DC pulse wave LED2 LED1 SW2 SW871 CN712 R V coil 208 230 V AC Output CN713 Valve coil 208 230 V AC Output CN714 Base heater 208 230 V AC Output CNAC to outdoor power P C board 208 230 V AC Input F711 FUSE T3 15AL250V CN611 Serial signal 12 24 V CN621 CN791 LEV Room A C N792 LEV Room B CN794 LEV Room D...

Page 85: ...r temperature thermistor RT68 CNTH1 CNTH2 Ambient temperature thermistor RT65 SW1 LED3 LEV 12 V DC pulse wave LED2 LED1 SW2 SW871 CN712 R V coil 208 230 V AC Output CN713 Valve coil 208 230 V AC Output CN714 Base heater 208 230 V AC Output CNAC to outdoor power P C board 208 230 V AC Input F711 FUSE T3 15AL250V CN611 Serial signal 12 24 V CN621 CN791 LEV Room A C N792 LEV Room B CN794 LEV Room D C...

Page 86: ...anger temperature thermistor RT68 CNTH1 CNTH2 Ambient temperature thermistor RT65 SW1 LED3 LEV 12 V DC pulse wave LED2 LED1 SW2 SW871 CN712 R V coil 208 230 V AC Output CN713 Valve coil 208 230 V AC Output CN714 Base heater 208 230 V AC Output CNAC to outdoor power P C board 208 230 V AC Input F711 FUSE T3 15AL250V CN611 Serial signal 12 24 V CN621 CN791 LEV Room A C N792 LEV Room B CN794 LEV Room...

Page 87: ...L250V 208 230 V AC Input CNAC2 208 230 V AC Output Connect to earth CN152 Signal Transmission From Outdoor Control P C board 5 VDC pulse wave CN171 Fin temperature thermistor RT64 CN151 Signal transmission To Outdoor control P C board 5 V DC pulse wave 15 V 15 V 200 180 160 140 120 100 80 60 40 20 0 5HVLVWDQFH N Temperature Fin temperature thermistor RT64 Thermistor R50 17 k 2 B constant 4150 3 5W...

Page 88: ...C Input CNAC2 208 230 VAC Output CNAC1 208 230 V Output Connect to earth Connect to earth Connect to earth Connect to reactor Red line F2 FUSE T6 3AL250V F1 FUSE T6 3AL250V Connect to reactor White line CN151 Signal transmission To Outdoor control P C board 5 V DC pulse wave 15 V 15 V 18 V 200 180 160 140 120 100 80 60 40 20 0 5HVLVWDQFH N Temperature Fin temperature thermistor RT64 Thermistor R50...

Page 89: ... panel Screws of the front panel Catch of the front panel Catch of the front panel Screws of the top panel Screws of the front panel Screws of the top panel Screws of the back panel Photo 2 DISASSEMBLY INSTRUCTIONS 12 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 lock...

Page 90: ... screws fixing the outdoor control P C board holder and remove the outdoor control P C board 5 Disconnect the lead wire from the reactor 6 Remove the screws fixing the reactor and remove the reactor 7 Disconnect the lead wire of the power P C board 8 Disconnect the catches of the PB cover and remove the PB cover 9 Remove the outdoor power P C board 90 Photo 4 Catches of the PB cover Photo 5 Screws...

Page 91: ...ant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 4 Disconnect the compressor lead wire from the terminal of the compressor U V W 5 Disconnect the outdoor control P C board connectors CNF1 CNTH1 CNTH2 CN63H CN712 CN791 CN792 CN793 CN794 MXZ 4C 6 Remove the screws fixing the electrical parts and remove the electrical parts Photo 4 7 Remove the propeller fan 8 Remove ...

Page 92: ...ct the power supply and indoor outdoor connect ing wire Gas recovery is not required if the unit is pumped down 3 Remove the LEV coils 4 Detach the brazed parts of the expansion valves and pipes 92 Photo 9 Suction pipe brazed part Compressor nuts LEV coils Expansion valves Expansion valves Discharge pipe brazed part OBH702E ...

Page 93: ...ove the screws fixing the service panel 3 Pull down the service panel and remove the service panel 4 Disconnect the power supply and indoor outdoor connect ing wire 5 Remove the screws fixing the front panel and remove the front panel 6 Remove the screws fixing the back panel and remove the back panel 93 Photo 1 Screws of the service panel Screws of the front panel Screws of the top panel Screws o...

Page 94: ...emove the TB support 7 Remove the screws fixing the control box separator and remove the control box separator 8 Disconnect the lead wire of the outdoor power P C board 9 Remove the screws fixing the outdoor power P C board and remove the outdoor power P C board with the out door P C board holder 10 Remove the screws fixing the control box F and remove the control box F 11 Remove the screws fixing...

Page 95: ...ard connectors CNF1 CNTH1 CNTH2 CN63H CN712 CN713 CN714 MXZ C NAHZ MXZ C NAHZ2 CN791 CN792 CN793 MXZ 5C42NA MXZ 3C24 30NAHZ MXZ 5C42NA2 MXZ 3C24 30NAHZ2 CN794 MXZ 5C42NA MXZ 5C42NA2 CN795 MXZ 5C42NA MXZ 5C42NA2 7 Remove the screws fixing the electrical parts and remove the electrical parts Photo 4 8 Remove the propeller fan 9 Remove the screws fixing the VB fixture and remove the VB fixture 10 Rem...

Page 96: ...ction pipe brazed part Compressor nuts LEV coils Expansion valves Discharge pipe brazed part HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Issued Dec 2016 No OBH702 REVISED EDITION E Issued Jul 2016 No OBH702 REVISED EDITION D Issued Mar 2016 No OBH702 REVISED EDITION C Issued Feb 2016 No OBH702 REVISED EDITION B Issued O...

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