Mitsubishi Electric MXZ-2C20NA2-U1 Service Manual Download Page 105

Page: 105 / 114

OPERATING PROCEDURE

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NOTE:

Gas recovery is not required if the unit is pumped down.

(1) Remove the top panel and the service panel (Refer to

section 1).

(2) Disconnect the power supply cord and indoor/outdoor

connecting wires.

(3) Remove all the LEV coils.
(4) Detach all the brazed parts of the expansion valves and

pipes.

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(1) Remove the service panel (Photo 1).

(2) Disconnect the power supply cord and indoor/outdoor

connecting wires.

(3) Remove the top panel, the cabinet, and the back panel

(Photo 1, 2, 3).

(4) Disconnect all the connectors and the lead wires on the

outdoor control P.C. board.

(5) Remove all the screws of outdoor control P.C. board holder,

and remove the outdoor control P.C. board holder (Photo 5).

(6) Make sure that the service port is visible.

Photo 12

105

Expansion
valves

Photo 11

LEV coils

Service port
(High pressure side)

OBH702G

Summary of Contents for MXZ-2C20NA2-U1

Page 1: ...s OBH683 MSZ GE NA Series OBH548 MSZ GL NA Series OBH732 MSZ EF NA Series OBH736 MFZ KA NA Series OBH568 MFZ KJ NA Series OBH752 SLZ KA NA Series OCH487 SLZ KF NA TH Series OCH669 PLA A BA Series OCH420 PLA A EA Series OCH640 SEZ KD NA Series PEAD A AA Series PCA A KA Series OCH455 MVZ A AA Series SVZ KP NA Series MXZ 3C24NA MXZ 3C24NA2 MXZ 3C30NA MXZ 3C30NA2 MXZ 4C36NA MXZ 4C36NA2 CONTENTS 1 TECH...

Page 2: ...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 WIRING DIAGRAM 6 and TEST POINT DIAGRAM AND VOLTAGE 1...

Page 3: ...EZ KD NA4 TH PEAD A AA5 Ceiling suspended PCA A KA6 TH Multi position MVZ A AA4 SVZ KP NA MXZ 5C42NA2 U1 Connectable indoor unit lineups Heat pump inverter type Model type Model name Capacity class kBTU h 06 09 12 15 18 24 30 36 Wall mounted MSZ FE NA MSZ FH NA MSZ FH NA2 MSZ GE NA MSZ GL NA U1 MSZ EF NA U1 Floor standing MFZ KA NA MFZ KJ NA U1 4 way cassette SLZ KA NA TH SLZ KF NA TH PLA A BA6 PL...

Page 4: ...12 15 18 24 30 36 Wall mounted MSZ FE NA MSZ FH NA MSZ FH NA2 MSZ GE NA MSZ GL NA U1 MSZ EF NA U1 Floor standing MFZ KA NA MFZ KJ NA U1 4 way cassette SLZ KA NA TH SLZ KF NA TH PLA A BA6 PLA A EA7 Ceiling concealed SEZ KD NA4 TH PEAD A AA5 Ceiling suspended PCA A KA6 TH Multi position MVZ A AA4 SVZ KP NA MXZ 3C24NAHZ2 U1 Connectable indoor unit lineups Heat pump inverter type Model type Model name...

Page 5: ...C30NA 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 MXZ 2C20NA2 U1 1 New model OBH702G ...

Page 6: ... 3C24NAHZ MXZ 3C24NAHZ2 MXZ 3C30NAHZ MXZ 3C30NAHZ2 MXZ 3C24NA MXZ 3C24NA2 MXZ 3C30NA MXZ 3C30NA2 MXZ 4C36NA MXZ 4C36NA2 MXZ 2C20NA2 Air outlet Drain outlet Air inlet Back and side Air outlet Drain outlet Air inlet Back and side Air outlet Drain outlet Air inlet Back and side OBH702G ...

Page 7: ...ransformer 12 24 VDC Refrigerant piping Not supplied optional parts Valve size Liquid in 1 4 Gas in 3 8 Connection method Indoor Flared Outdoor Flared Refrigerant charge R410A lb 5 lb 15 oz Refrigeration oil Model À R 20 3 0 6 NEO22 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 speed 80 67 95 75 ...

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 À R 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 speed...

Page 9: ... 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 À R 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 speed...

Page 10: ...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 À R 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 11: ...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 À R 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 ...

Page 12: ...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 À R 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 compressor s...

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 À R 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 compr...

Page 14: ... 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 À R 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 compr...

Page 15: ... 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 H Cooling High FUNCTION FAN SPEED Heating High 51 SPL dB A 55 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 ...

Page 16: ... BAND SOUND PRESSURE LEVEL 0dB 0 0002 MICRO BAR BAND CENTER FREQUENCIES H MXZ 3C24NAHZ MXZ 3C24NAHZ2 MXZ 3C30NAHZ MXZ 3C30NAHZ2 Cooling High FUNCTION FAN SPEED Heating High 54 SPL dB A 58 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 B...

Page 17: ... Unit B Connecting wire hole 1 1 32 13 2 19 32 1 2 Bolt Pitch Foundation Bolt M8 4 13 32 13 16 Oval Hole 3 ø 1 5 16 Drain hole Air Inlet Air Inlet Air Outlet 14 3 16 15 32 23 32 21 32 1 11 32 2 9 16 12 3 8 8 5 32 6 21 32 6 23 32 19 11 16 11 16 11 16 15 19 32 Handle MXZ 2C20NA2 Unit inch mm OUTLINES AND DIMENSIONS 5 Lock nut Connector Grounding terminal Conduit cover OBH702G ...

Page 18: ...18 MXZ 3C24NA MXZ 3C24NA2 MXZ 3C30NA MXZ 3C30NA2 Unit inch mm Lock nut Conduit plates Conduit connector OBH702G ...

Page 19: ...19 MXZ 4C36NA MXZ 4C36NA2 Unit inch mm Lock nut Conduit plates Conduit connector OBH702G ...

Page 20: ...20 MXZ 5C42NA MXZ 5C42NA2 Unit inch mm Lock nut Conduit connector Conduit plate Under Conduit plate Top OBH702G ...

Page 21: ...21 MXZ 2C20NAHZ MXZ 2C20NAHZ2 Unit inch mm Lock nut Conduit connector Conduit plate OBH702G ...

Page 22: ...22 MXZ 3C24NAHZ MXZ 3C24NAHZ2 MXZ 3C30NAHZ MXZ 3C30NAHZ2 Unit inch mm Lock nut Conduit connector Conduit plate Under Conduit plate Top OBH702G ...

Page 23: ...741 D1 IC401 IC402 2 1 CN171 1 8 CNTH1 2 1 CNTH2 5 5 CNMC 5 1 1 7 1 CN792 CN791 1 5 5 7 1 CNF1 CN702 1 3 CNDC U V W 1 3 1 CN151 1 7 CNDC CNAC2 CN701 2 1 1 2 CN152 IC501 IC411 TAB4 TAB6 TAB5 TAB3 X52C 3 5 CN601 1 3 CN611 1 TAB1 TAB2 3 1 CNAC1 3 TBE4 TBE2 TBE1 PTC1 PTC2 X65 L1 L2 GR BU BK BU RD BK BU WH BK BK BN BK BK RD WH BK BK BK BK BK BK BK BK BU RD BU BK BK BK BK BK BU GNYN WH LEV A B R MC MF P...

Page 24: ...24 MXZ 3C24NA MXZ 3C30NA OBH702G ...

Page 25: ...25 MXZ 3C24NA2 MXZ 3C30NA2 OBH702G ...

Page 26: ...26 MXZ 4C36NA OBH702G ...

Page 27: ...27 MXZ 4C36NA2 OBH702G ...

Page 28: ...RD 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 D1 F1...

Page 29: ...29 MXZ 5C42NA2 OBH702G ...

Page 30: ...30 MXZ 2C20NAHZ OBH702G ...

Page 31: ...31 MXZ 2C20NAHZ2 OBH702G ...

Page 32: ...32 MXZ 3C24NAHZ MXZ 3C30NAHZ OBH702G ...

Page 33: ...33 MXZ 3C24NAHZ2 MXZ 3C30NAHZ2 OBH702G ...

Page 34: ...B Capillary tube O D 0 14 I D 0 09 19 68 ø3 6 ø2 4 500 Discharge temperature thermistor RT62 Strainer 100 Strainer 100 R V coil OFF ON Refrigerant flow in cooling Refrigerant flow in heating Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 FAN OUT HEX OUT Service port Service port Strainer 100 4 way valve High pressure switch Capillary tube O D 0 16 x I D 0 11...

Page 35: ...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 MAX REFRIGERANT PIPING LENGTH PIPE SIZE SELECTION MXZ 2C20NA2 2SHUDWLQJ 5DQJH 0 1 a b Outdoor unit Indoor units Max height difference 49 ft 33 ft 49 ft Outdoor unit union diameter For Indoor unit A Liquid 1 4 Gas 3 8 Indoor unit B Liquid 1 4 Gas 3 8 Indoor intake air tem...

Page 36: ...or 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 ø1 4 ø3 8 Sub muffler Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Compressor shell temperature thermistor RT62 Defrost temperature thermistor RT61 Indoor unit ...

Page 37: ...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 2SHUDWLQJ 5DQJH 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 38: ...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 39: ... 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 2SHUDWLQJ 5DQJH 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 40: ... 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 41: ...r unit D Liquid 1 4 Gas 3 8 Indoor unit E Liquid 1 4 Gas 3 8 2SHUDWLQJ 5DQJH 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 42: ...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 43: ...NAHZ2 2SHUDWLQJ 5DQJH 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 44: ...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 45: ...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 2SHUDWLQJ 5DQJH 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 46: ...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 47: ...re DB ºF 95 47 95 47 WB ºF 43 43 Fan speed rpm 650 700 650 700 LUÀRZ CFM 1 342 1 458 1 342 1 458 Model MXZ 3C24NA MXZ 3C24NA2 Indoor type Non Duct 06 06 09 Duct 09 09 09 Item Unit Cooling Heating Cooling Heating Total Capacity Btu h 22 000 25 000 23 600 24 600 SHF Input kW 1 62 1 75 2 10 1 90 Electrical circuit Power supply V phase Hz 208 230 1 60 Input kW 1 554 1 684 1 920 1 780 Comp current 208 ...

Page 48: ...erature DB ºF 95 47 95 47 WB ºF 43 43 Fan speed rpm 720 750 720 750 LUÀRZ 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...

Page 49: ...F 95 47 95 47 WB ºF 43 43 Fan speed rpm 630 730 630 730 LUÀRZ 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 12 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 50: ...re DB ºF 95 47 95 47 WB ºF 43 43 Fan speed rpm 630 730 630 730 LUÀRZ 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 51: ...x 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 temperat...

Page 52: ... the difference 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 RZ WR PHDVXUH WKH LQGRRU DLU ZHW DQG GU EXOE WHPSHUDWXUH GLIIHUHQFH 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 thermomete...

Page 53: ...5 19 23 27 31 35 39 43 47 51 55 59 63 Input correction actors Outdoor intake air Wet ul temperature F Total input Heatin Indoor intake air Dr ul temperature F Indoor intake air Dr ul temperature F Indoor air Wet ul temperature di erence F 15 class 06 class 12 class 09 class Indoor air Wet ul temperature di erence F 15 class 06 class 12 class 09 class 6 8 6 2 5 7 5 1 4 6 4 1 3 6 9 6 8 8 8 0 7 2 6 5...

Page 54: ... 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 19 43 11 27 35 51...

Page 55: ...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 56: ...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 57: ...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 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...

Page 58: ... 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 50 100 150 0 5 1 0 1 5 2 0 HEAT Total ...

Page 59: ...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 60: ... 7 0 Ambient temperature F Outdoor low pressure Outdoor unit current A Outdoor unit current A 48 Hz PSIG 40 Hz 40 Hz 65 75 70 86 80 75 70 Indoor Dry bulb temperature F Indoor Dry bulb 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 H...

Page 61: ...ient temperature F Outdoor low pressure Outdoor unit current A Outdoor unit current A 48 Hz PSIG 40 Hz 40 Hz 65 75 70 86 80 75 70 Indoor Dry bulb temperature F Indoor Dry bulb 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 In...

Page 62: ...UH Û QGRRU U EXOE WHPSHUDWXUH Û QGRRU U EXOE WHPSHUDWXUH Û 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 spee...

Page 63: ...UH Û QGRRU U EXOE WHPSHUDWXUH Û QGRRU U EXOE WHPSHUDWXUH Û 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 spee...

Page 64: ...RQ 287 225 81 7 0 1 0 1 0 1 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 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...

Page 65: ...RQ 287 225 81 7 0 1 0 1 0 1 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 or HEAT The ...

Page 66: ...RQ 287 225 81 7 0 1 0 1 0 1 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 switch to COOL or HEAT The ...

Page 67: ...QGRRU U EXOE WHPSHUDWXUH Û QGRRU U EXOE WHPSHUDWXUH Û QGRRU U EXOE WHPSHUDWXUH Û 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 HEAT The ...

Page 68: ...z 24 Hz 65 70 75 QGRRU U EXOE WHPSHUDWXUH Û QGRRU U EXOE WHPSHUDWXUH Û QGRRU U EXOE WHPSHUDWXUH Û 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 HEAT The ...

Page 69: ...WXUH Û QGRRU U EXOE WHPSHUDWXUH Û QGRRU U EXOE WHPSHUDWXUH Û 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 HEAT The switch i...

Page 70: ...t 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 7 ...

Page 71: ...t 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 7 ...

Page 72: ...t 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 7 ...

Page 73: ...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 0 ...

Page 74: ... 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 WHP...

Page 75: ...ues 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 WHPSHU...

Page 76: ...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 ż ż ż Indoor coil temperature thermistor Cooling Coil frost prevention ż ż Heating High pres sure protection ż ż Defrost thermistor Heating Defrosting ż ż ż ż Fin temperature thermistor Protection ż ż Ambient...

Page 77: ...N 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 2C20NA2 MXZ 3C24NA MXZ 3C3...

Page 78: ...ring 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 outdoor 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 sto...

Page 79: ...ed 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 the comp...

Page 80: ...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 Mak...

Page 81: ... around outdoor unit Check outdoor unit air passage Refer to 11 6 Check of outdoor fan motor P C board temperature 4 times Not lit The P C board temperature exceeds 152 F MXZ 1 0 4C36NA2 189 F 0 1 0 1 0 1 5C42NA2 during operation 8 time blink Outdoor fan motor Lit Lit A failure occurs 3 consecutive times within 30 seconds after the fan gets started Refer to 11 6 Check of outdoor fan motor 9 time b...

Page 82: ...rating indoor unit gets warm Refer to 11 6 Check of LEV When heating room does not get warm Refer to 11 6 How to check inverter compressor Check mis piping shortage of capacity When cooling 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 ...

Page 83: ... connecting wire between M NET adapter P C board and outdoor control P C board or terminal bed 10 Lit 12 times Zero cross detecting circuit Outdoor power P C board The protection cut out of the zero cross detecting circuit operates 10 consecutive times Replace the outdoor power P C board 11 Lit 13 times Current sensor A short or open circuit is detected in the input cur rent detection circuit duri...

Page 84: ... heat exchanger temperature exceeds 136 4 F during operation This symptom does not mean any abnormality of the product but check the following points KHFN LI LQGRRU OWHUV DUH FORJJHG Check if refrigerant is short Check if indoor outdoor unit air circulation is short cycled 31 7 times Lit High Low Pressure bypass valve Cooling evaporating temperature drop prevention control During cooling operation...

Page 85: ...ith a tester HIRUH PHDVXUHPHQW KROG WKH WKHUPLVWRU ZLWK RXU KDQGV WR ZDUP LW XS 5HIHU WR 7 67 32 17 5 0 1 92 7 2XWGRRU FRQWURO 3 ERDUG IRU WKH FKDUW RI WKHUPLVWRU MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 3C24NA2 MXZ 3C30NA2 MXZ 4C36NA2 MXZ 2C20NA2 MXZ 2C20NA2 MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 3C24NA2 MXZ 3C30NA2 MXZ 4C36NA2 Normal Each phase N N N N N N Normal Each phase Measure the resistance betw...

Page 86: ...roper 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 OBH702G ...

Page 87: ...voltage of 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 ...

Page 88: ...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 co...

Page 89: ...XZ 2C CN791 LEV A CN792 LEV B CN797 LEV R MXZ 2C20NA2 MXZ 3C 4C 5C CN791 LEV A CN792 LEV B CN793 LEV C 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 KHQ FRROLQJ KHDW H FKDQJHU RI QRQ RSHUDWLQJ LQGRRU XQLW IURVWV KHQ KHDWLQJ QRQ RSHUDWLQJ LQGRRU XQLW JHWV ZDUP CN791 CN792 CN793 CN794 CN795 ...

Page 90: ...ssor 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 RXWGRRU...

Page 91: ...he 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 sta...

Page 92: ...oints pin1 pin4 pin5 pin4 pin6 pin4 pin7 pin4 To measure the resistance connect the negative end of the tester to pin4 Resistance N 0 N Measuring points 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 repeat 0V and 5V...

Page 93: ...on 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 RQ UP 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 RQ UP LED1 indication lamp on...

Page 94: ... 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 CN791 LEV Room ...

Page 95: ...nger 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 Signal transmission To power board 5 V DC pu...

Page 96: ...changer 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 Ro...

Page 97: ...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 98: ...istor 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 CN791 LEV Room A C N7...

Page 99: ... 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 VDC pulse wave 15 V 15 V MXZ 2C20NA2 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 H S t ºC º 273 t 1 323 1 32 50 ...

Page 100: ...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 101: ... 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 102: ...eve and pull out the terminal slowly The terminal which has the locking mechanism can be detached as shown below There are following 2 types 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 Detaching method of the terminal with locking mechanism Connector Sleeve Lockin lever 12 1 MXZ 2C2...

Page 103: ...bly 7 Remove all the screws of outdoor control P C board holder and remove the outdoor control P C board holder 8 Remove all the screws of the reactor and remove the reactor 9 Remove all the screws of the reactor bed and remove the reactor bed 10 Remove all the screws of the heat sink support and remove the heat sink support 11 Remove all the screws fixing the outdoor power P C board 12 Disconnect...

Page 104: ...from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 5 Disconnect the outdoor control P C board connectors CNF1 CNTH1 CNTH2 CN63H CN791 CN792 CN793 CN794 CN797 CN712 6 Disconnect the compressor lead wire from the terminal of the compressor U V W 7 Remove all the screws of the electrical box assembly and remove the electrical box assembly Photo ...

Page 105: ...IRUH XVLQJ WKH VHUYLFH SRUW LJK SUHVVXUH VLGH 1 Remove the service panel Photo 1 2 Disconnect the power supply cord and indoor outdoor connecting wires 3 Remove the top panel the cabinet and the back panel Photo 1 2 3 4 Disconnect all the connectors and the lead wires on the outdoor control P C board 5 Remove all the screws of outdoor control P C board holder and remove the outdoor control P C boa...

Page 106: ...ws fixing the front panel and remove the front panel 6 Remove all the screws fixing the back panel and remove the back panel 106 12 2 MXZ 3C24NA MXZ 3C30NA MXZ 4C36NA MXZ 3C24NA2 MXZ 3C30NA2 MXZ 4C36NA2 Photos MXZ 4C36NA MXZ 4C36NA2 127 7XUQ 2 WKH SRZHU VXSSO EHIRUH GLVDVVHPEO Photo 1 Photo 3 Screws of the service panel Service panel Screws of the front panel Catch of the front panel Catch of the ...

Page 107: ... C board holder Photo 6 and 7 9 Remove the outdoor control P C board holder 10 Disengage all the catches of the outdoor control P C board holder and remove the outdoor control P C board Photo 8 11 Disconnect all the lead wires from the reactor Photo 9 12 Remove all the screws fixing the reactor and remove the reactor Photo 9 13 Remove all the lead wires from the clamps on the sepa rator Photo 10 1...

Page 108: ...r power P C board Photo 12 NOTE When reassembling pass the lead wire of the CN171 thorough the notch and behind the lead wire of the compressor Photo 13 17 Remove all the screws of the heatsink fixing parts and remove the heatsink fixing parts Photo 14 NOTE Some units have only 1 heatsink fixing part 18 Remove the heatsink 108 Photo 12 Photo 13 Photo 14 Photo 11 Photo 10 Screws of the power P C bo...

Page 109: ...E 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 all the screws fixing the electrical parts and remove the electrical parts 7 Remove the propeller fan 8 Remove all the screws fixi...

Page 110: ...t the power supply cord and indoor outdoor connecting wires 3 Remove all the LEV coils NOTE When reassembling to secure the LEV coils on the pipe make sure to use the metal clips for proper positioning 4 Detach all the brazed parts of the expansion valves and pipes 110 Photo 18 Suction pipe brazed part Compressor nuts LEV coils Expansion valves Expansion valves Discharge pipe brazed part OBH702G ...

Page 111: ...he screws fixing the service panel 3 Pull down on the service panel and remove the service panel 4 Disconnect the power supply cord and indoor outdoor connecting wires 5 Remove all the screws fixing the front panel and remove the front panel 6 Remove all the screws fixing the back panel and remove the back panel 111 Photo 1 Screws of the service panel Screws of the front panel Screws of the top pa...

Page 112: ... and remove the TB support 7 Remove all 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 all the screws fixing the outdoor power P C board and remove the outdoor power P C board with the outdoor P C board holder 10 Remove all the screws fixing the control box F and remove the control box F 11 Remove ...

Page 113: ...isconnect the outdoor control P C board connectors CNF1 CNTH1 CNTH2 CN63H CN712 CN713 CN714 0 Â1 0 Â1 CN791 CN792 CN793 0 1 0 1 0 1 0 1 CN794 0 1 0 5C42NA2 CN795 0 1 0 1 7 Remove all the screws fixing the electrical parts and remove the electrical parts Photo 4 8 Remove the propeller fan 9 Remove all the screws fixing the VB fixture and remove the VB fixture 10 Remove all the screws fixing the sep...

Page 114: ...n 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 RS ULJKW 0 768 6 75 25325 7 21 Issued Oct 2018 No OBH702 REVISED EDITION G Issued Apr 2017 No OBH702 REVISED EDITION F Issued Dec 2016 No OBH702 REVISED EDITION E Issued Jul 2016 No OBH702 REVISED EDITION D Issued Mar 2016 No OBH702 RE...

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Mitsubishi Electric MXZ-2C20NA2-U1, Service Manual

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