Page 1: Table Of Contents
OBH702 REVISED EDITION-M is void. OUTDOOR UNIT No. OBH702 utilized REVISED EDITION-N SERVICE MANUAL R410A Indoor unit service manual Models MSZ-FE·NA Series (OBH542) MXZ-2C20NA2 - MXZ-2C20NAHZ MXZ-2C20NA3 - MXZ-2C20NAHZ2 - MSZ-FH·NA Series (OBH683) MXZ-2C20NA4 - MXZ-2C20NAHZ3 - MSZ-GE·NA Series (OBH548) MXZ-3C24NA MXZ-2C20NAHZ4 - MSZ-GL·NA Series (OBH732)
Page 2 Use the specified refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
Page 3 • WIRING DIAGRAM (7.) and TEST POINT DIAGRAM AND VOLTAGE (12-7.) have been changed. Revision E: • Capacity and input curve have been corrected. Revision F: • MXZ-2C20NA2 - has been added. Revision G: • 5. NOISE CRITERIA CURVES has been changed.
Page 4: Indoor / Outdoor Unit Compatibility Table
INDOOR / OUTDOOR UNIT COMPATIBILITY TABLE <MXZ-2C20NA2-U1/U4> <MXZ-2C20NAHZ2-U1> Connectable indoor unit lineups (Heat pump inverter type) Connectable indoor unit lineups (Heat pump inverter type) Capacity class [kBTU/h] Capacity class [kBTU/h] Model type Model name Model type Model name ● ●...
Page 5 <MXZ-3C24NA2-U1> <MXZ-3C24NAHZ2-U1> Connectable indoor unit lineups (Heat pump inverter type) Connectable indoor unit lineups (Heat pump inverter type) Capacity class [kBTU/h] Capacity class [kBTU/h] Model type Model name Model type Model name ● ● ● ● ● ● ● ● MSZ-FE**NA MSZ-FE**NA ●...
Page 6 <MXZ-3C30NA2-U1> <MXZ-3C30NAHZ2-U1> Connectable indoor unit lineups (Heat pump inverter type) Connectable indoor unit lineups (Heat pump inverter type) Capacity class [kBTU/h] Capacity class [kBTU/h] Model type Model name Model type Model name ● ● ● ● ● ● ● ● MSZ-FE**NA MSZ-FE**NA ●...
Page 7 <MXZ-4C36NA2-U1> <MXZ-5C42NA2-U1> Connectable indoor unit lineups (Heat pump inverter type) Connectable indoor unit lineups (Heat pump inverter type) Capacity class [kBTU/h] Capacity class [kBTU/h] Model type Model name Model type Model name ● ● ● ● ● ● ● ● MSZ-FE**NA MSZ-FE**NA ●...
Page 8: Technical Changes
MXZ-4C36NA MXZ-4C36NA2 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-5C42NA MXZ-5C42NA2 1. Outdoor control P.C. board has been changed. MXZ-2C20NA2 - 1. New model MXZ-2C20NA2 MXZ-2C20NA2 1. Outdoor fan motor has been changed. 2. Outdoor control P.C. board has been changed. MXZ-2C20NA2 - MXZ-2C20NA3 -...
Page 9: Safety Precaution
SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuit must be disconnected. Preparation before the repair service Precautions during the repair service • Prepare the proper tools. • Do not perform the work involving the electric parts with •...
Page 10 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a siphon type.
Page 11 2-3. Cautions for refrigerant piping work Refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is the same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
Page 12 Tools for R410A (The following table shows whether conventional tools can be used or not.) Tools and materials R410A tools Can R22 tools be used? Can R407C tools be used? Gauge manifold Tool exclusive for R410A Air purge, refrigerant charge and operation check Charge hose Tool exclusive for R410A...
Page 13: Part Names And Functions
PART NAMES AND FUNCTIONS MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4 Air inlet (Back and side) Air outlet Drain outlet MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4 Air inlet (Back and side) Air outlet Drain outlet MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3...
Page 14: Specification
SPECIFICATION MXZ-2C20NA2 MXZ-2C20NA3 Outdoor model Item Indoor type Non-Duct (09+09) Duct (09+12) 18,000 20,000 Cooling Btu/h Capacity Heating 47 Btu/h 22,000 22,000 Heating 17 Btu/h 15,500 14,500 Cooling 1,417 2,000 Power 1,641 1,771 Heating 47 consumption Heating 17 1,750 1,810 Cooling 12.7...
Page 15 MXZ-2C20NA4 Outdoor model Item Indoor type Non-Duct (09+09) Duct (09+12) 18,000 20,000 Cooling Btu/h Capacity Heating 47 Btu/h 22,000 22,000 Heating 17 Btu/h 15,500 14,500 Cooling 1,417 2,000 Power 1,641 1,771 Heating 47 consumption Heating 17 1,750 1,810 EER2 Cooling 12.7 10.0 SEER2...
Page 16 MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 Outdoor model Item Indoor type Non-Duct (06+09+09) Duct (09+09+09) 22,000 23,600 Cooling Btu/h Capacity Heating 47 Btu/h 25,000 24,600 Heating 17 Btu/h 19,600 19,600 Cooling 1,620 2,100 Power 1,750 1,900 Heating 47 consumption Heating 17 2,580 2,440 Cooling 13.6 11.2...
Page 17 MXZ-3C24NA4 Outdoor model Item Indoor type Non-Duct (06+09+09) Duct (09+09+09) 22,000 23,600 Cooling Btu/h Capacity Heating 47 Btu/h 25,000 24,600 Heating 17 Btu/h 21,000 21,000 Cooling 1,610 2,100 Power 1,740 1,890 Heating 47 consumption Heating 17 2,860 2,960 EER2 Cooling 13.60 11.20 SEER2...
Page 18 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 Outdoor model Item Indoor type Non-Duct (09+09+12) Duct (09+09+12) 28,400 27,400 Cooling Btu/h Capacity Heating 47 Btu/h 28,600 27,600 Heating 17 Btu/h 21,000 21,000 Cooling 2,680 2,840 Power 2,150 2,220 Heating 47 consumption Heating 17 2,740 2,820 Cooling 10.6 SEER...
Page 19 MXZ-3C30NA4 Outdoor model Item Indoor type Non-Duct (09+09+12) Duct (09+09+12) 28,400 27,400 Cooling Btu/h Capacity Heating 47 Btu/h 28,600 27,600 Heating 17 Btu/h 21,000 21,000 Cooling 2,670 2,840 Power 2,149 2,220 Heating 47 consumption Heating 17 2,860 2,960 EER2 Cooling 10.60 9.60 SEER2...
Page 20 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 Outdoor model Item Indoor type Non-Duct (09+09+09+09) Duct (09+09+09+09) 35,400 34,400 Cooling Btu/h Capacity Heating 47 Btu/h 36,000 34,400 Heating 17 Btu/h 26,600 26,600 Cooling 3,760 3,940 Power 3,020 3,100 Heating 47 consumption Heating 17 3,440 3,540 Cooling SEER Cooling...
Page 21 MXZ-4C36NA4 Outdoor model Item Indoor type Non-Duct (09+09+09+09) Duct (09+09+09+09) 35,400 34,400 Cooling Btu/h Capacity Heating 47 Btu/h 36,000 34,400 Heating 17 Btu/h 26,600 26,600 Cooling 3,760 3,940 Power 3,010 3,090 Heating 47 consumption Heating 17 3,440 3,540 EER2 Cooling 9.40 8.70 SEER2...
Page 22 MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 Outdoor model Item Indoor type Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) 40,500 NA, NA2: 37,500 / NA3: 37,400 Cooling Btu/h Capacity Heating 47 Btu/h 45,000 41,000 Heating 17 Btu/h 30,500 29,100 Cooling 4,403 4,112 Power 3,575 3,463 Heating 47 consumption Heating 17 4,750...
Page 23 MXZ-5C42NA4 Outdoor model Item Indoor type Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) 40,500 37,400 Cooling Btu/h Capacity Heating 47 Btu/h 45,000 41,000 Heating 17 Btu/h 30,500 29,100 Cooling 4,403 4,112 Power 3,575 3,463 Heating 47 consumption Heating 17 4,750 5,231 EER2 Cooling SEER2 Cooling 19.7...
Page 24 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 Outdoor model Item Indoor type Non-Duct (09+09) Duct (09+12) 18,000 20,000 Cooling Btu/h Capacity Heating 47 Btu/h 22,000 22,000 Heating 17 Btu/h 22,000 22,000 Cooling 1,334 1,819 Power 1,612 1,750 Heating 47 consumption Heating 17 3,071 3,224 Cooling 13.5 11.0...
Page 25 MXZ-2C20NAHZ4 Outdoor model Item Indoor type Non-Duct (09+09) Duct (09+12) 18,000 20,000 Cooling Btu/h Capacity Heating 47 Btu/h 22,000 22,000 Heating 17 Btu/h 22,000 22,000 Cooling 1,334 1,819 Power 1,612 1,750 Heating 47 consumption Heating 17 3,071 3,224 EER2 Cooling 13.5 11.0 SEER2...
Page 26 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 Outdoor model Item Indoor type Non-Duct (06+06+09) Duct (09+09+09) 22,000 23,600 Cooling Btu/h Capacity Heating 47 Btu/h 25,000 24,600 Heating 17 Btu/h 25,000 24,600 Cooling 1,630 2,360 Power 1,725 1,871 Heating 47 consumption Heating 17 3,557 3,795 Cooling 13.5 10.0...
Page 27 MXZ-3C24NAHZ4 Outdoor model Item Indoor type Non-Duct (06+06+09) Duct (09+09+09) 22,000 23,600 Cooling Btu/h Capacity Heating 47 Btu/h 25,000 24,600 Heating 17 Btu/h 25,000 24,600 Cooling 1,630 2,360 Power 1,725 1,871 Heating 47 consumption Heating 17 3,557 3,795 EER2 Cooling 13.5 10.0 SEER2...
Page 28 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 Outdoor model Item Indoor type Non-Duct (09+09+12) Duct (09+09+12) 28,400 27,400 Cooling Btu/h Capacity Heating 47 Btu/h 28,600 27,600 Heating 17 Btu/h 28,600 27,600 Cooling 2,272 2,661 Power 2,096 2,187 Heating 47 consumption Heating 17 4,192 4,258 Cooling 12.5 10.3...
Page 29 MXZ-3C30NAHZ4 Outdoor model Item Indoor type Non-Duct (09+09+12) Duct (09+09+12) 28,400 27,400 Cooling Btu/h Capacity Heating 47 Btu/h 28,600 27,600 Heating 17 Btu/h 28,600 27,600 Cooling 2,272 2,661 Power 2,096 2,187 Heating 47 consumption Heating 17 4,192 4,258 EER2 Cooling 12.5 10.3 SEER2...
Page 30: Noise Criteria Curves
NOISE CRITERIA CURVES MXZ-2C20NA2 MXZ-3C24NA FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE MXZ-2C20NA3 MXZ-3C24NA2 High Cooling High Cooling High Heating High Heating MXZ-2C20NA4 MXZ-3C24NA3 NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF...
Page 31 MXZ-3C30NA4 MXZ-4C36NA FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE MXZ-4C36NA2 High Cooling High Cooling High Heating High Heating MXZ-4C36NA3 NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20...
Page 32 MXZ-2C20NAHZ MXZ-3C24NAHZ FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 High Cooling High Cooling High Heating High Heating MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR NC-20...
Page 33: Outlines And Dimensions
OUTLINES AND DIMENSIONS MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4 Unit: inch (mm) 6-21/32” 19-11/16” 6-23/32” 2-9/16” 8-5/32” 12-3/8” Inlet Air Inlet 3-ø(1-5/16”) Drain hole Outlet 4-(13/32”×13/16”) Oval Hole (Foundation Bolt M8) Handle 13/32” 33-1/16” 1-3/16” 7-7/8” 1-1/32” 13” 1/2” Connecting wire hole 2-19/32”...
Page 34 MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 Unit: inch (mm) MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 (NA, NA2, NA3) Conduit plates Conduit connector Lock nut (NA4) Conduit plate Conduit connector Lock nut Conduit plate OBH702N...
Page 35 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4 Unit: inch (mm) (NA, NA2, NA3) Conduit plates Conduit connector Lock nut (NA4) Conduit plate Conduit connector Lock nut Conduit plate OBH702N...
Page 36 MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-5C42NA4 Unit: inch (mm) Conduit plate Top Conduit connector Lock nut Conduit plate Under OBH702N...
Page 37 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 MXZ-2C20NAHZ4 Unit: inch (mm) Lock nut Conduit plate Conduit connector OBH702N...
Page 38 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 MXZ-3C24NAHZ4 Unit: inch (mm) MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4 Lock nut Conduit plate Top Conduit connector Conduit plate Under OBH702N...
Page 39: Wiring Diagram
WIRING DIAGRAM MXZ-2C20NA2 CIRCUIT TB1 BREAKER X52C TAB1 TAB6 TAB5 TAB4 TAB3 POWER SUPPLY IC501 IC411 208/230V TAB2 IC402 IC401 AC 60Hz GNYN PTC1 PTC2 CNMC CNAC1 OUTDOOR POWER P.C. BOARD CN171 CNDC CN151 CN152 CNAC2 TBE4 TBE2 TBE1 RT64 t°...
Page 40 MXZ-2C20NA3 [If the reactor does not have a number display, refer to the figure below.] No.4 No.3 No.1 No.2 OBH702N...
Page 41 MXZ-2C20NA4 [If the reactor does not have a number display, refer to the figure below.] No.4 No.3 No.1 No.2 OBH702N...
Page 42 MXZ-3C24NA MXZ-3C30NA [Connection between reactor and outdoor power P.C. board] * There are 2 types of reactors, which may have a number display. Even if there is a number display, please wire as shown in the figure below. Connect to TAB3 Connect to TAB6 Connect to TAB4 Connect to TAB5...
Page 43 MXZ-3C24NA2 MXZ-3C30NA2 [Connection between reactor and outdoor power P.C. board] * There are 2 types of reactors, which may have a number display. Even if there is a number display, please wire as shown in the figure below. Connect to TAB3 Connect to TAB6 Connect to TAB4 Connect to TAB5...
Page 44 MXZ-3C24NA3 MXZ-3C30NA3 [If the reactor does not have a number display, refer to the figure below.] No.4 No.3 No.1 No.2 OBH702N...
Page 45 MXZ-3C24NA4 MXZ-3C30NA4 [If the reactor does not have a number display, refer to the figure below.] No.4 No.3 No.1 No.2 OBH702N...
Page 46 MXZ-4C36NA [Connection between reactor and outdoor power P.C. board] * There are 2 types of reactors, which may have a number display. Even if there is a number display, please wire as shown in the figure below. Connect to TAB3 Connect to TAB6 Connect to TAB4 Connect to TAB5...
Page 47 MXZ-4C36NA2 [Connection between reactor and outdoor power P.C. board] * There are 2 types of reactors, which may have a number display. Even if there is a number display, please wire as shown in the figure below. Connect to TAB3 Connect to TAB6 Connect to TAB4 Connect to TAB5...
Page 48 MXZ-4C36NA3 [If the reactor does not have a number display, refer to the figure below.] No.4 No.3 No.1 No.2 OBH702N...
Page 49 MXZ-4C36NA4 [If the reactor does not have a number display, refer to the figure below.] No.4 No.3 No.1 No.2 OBH702N...
Page 50 MXZ-5C42NA CIRCUIT BREAKER TAB5 TAB3 TAB6 TAB4 X52CA TAB1 POWER SUPPLY 208/230V IC411 IC501 IC401 X52CB 1 phase 60Hz GRN/YLW TAB2 X65A PTC1 PTC2 PTC3 12-24V TO INDOOR ~208/230V UNIT No. E OUTDOOR CNAC1 POWER P.C. BOARD 12-24V TO INDOOR CNDC CN151 CN152...
Page 51 MXZ-5C42NA2 OBH702N...
Page 52 MXZ-5C42NA3 CIRCUIT BREAKER TAB5 TAB3 TAB6 TAB4 X52CA TAB1 IC411 IC501 IC401 X52CB GNYE TAB2 X65A PTC1 PTC2 PTC3 12-24V 208/230V~ OUTDOOR CNAC1 POWER P.C. BOARD 12-24V CN151 CN152 CNDC CNAC2 CN171 TBE1 TBE2 TBE3 TBE4 208/230V~ CNMC t° RT64 CNDC CNF1 CN702...
Page 53 MXZ-5C42NA4 CIRCUIT BREAKER TAB5 TAB3 TAB6 TAB4 X52CA TAB1 IC501 IC411 IC401 X52CB GNYE TAB2 X65A PTC1 PTC2 PTC3 12-24V 208/230V~ OUTDOOR CNAC1 POWER P.C. BOARD 12-24V CN151 CN152 CNDC CNAC2 CN171 TBE1 TBE2 TBE3 TBE4 208/230V~ CNMC t° RT64 CNDC CN701 CNF1...
Page 54 MXZ-2C20NAHZ OBH702N...
Page 55 MXZ-2C20NAHZ2 OBH702N...
Page 56 MXZ-2C20NAHZ3 CIRCUIT BREAKER TAB5 TAB3 TAB6 TAB4 X52CA TAB1 IC411 IC501 IC401 X52CB GNYE TAB2 X65A PTC1 PTC2 PTC3 OUTDOOR CNAC1 POWER P.C. BOARD CN151 CN152 CNDC CNAC2 CN171 TBE1 TBE2 TBE3 TBE4 CNMC t° BK WH RT64 CNDC CN702 CN701 CNF1 CNAC...
Page 57 MXZ-2C20NAHZ4 CIRCUIT BREAKER TAB5 TAB6 TAB4 X52CA TAB3 TAB1 IC411 IC501 IC401 X52CB GNYE TAB2 X65A PTC1 PTC2 PTC3 OUTDOOR CNAC1 POWER P.C. BOARD CNDC CN151 CN152 CNAC2 CN171 TBE1 TBE2 TBE3 TBE4 CNMC t° BK WH RT64 CNDC CN701 CNF1 CN702 CNAC...
Page 58 MXZ-3C24NAHZ MXZ-3C30NAHZ OBH702N...
Page 59 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 OBH702N...
Page 60 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 CIRCUIT BREAKER TAB5 TAB6 TAB4 X52CA TAB3 TAB1 IC411 IC501 IC401 X52CB GNYE TAB2 X65A PTC1 PTC2 PTC3 OUTDOOR CNAC1 POWER P.C. BOARD CNDC CN151 CN152 CNAC2 CN171 TBE1 TBE2 TBE3 TBE4 CNMC t° RT64 12-24V 208/230V~ CNDC CN701 CNF1 CN702...
Page 61 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 CIRCUIT BREAKER TAB5 TAB6 TAB4 X52CA TAB3 TAB1 IC411 IC501 IC401 X52CB GNYE TAB2 X65A PTC1 PTC2 PTC3 OUTDOOR CNAC1 POWER P.C. BOARD CN151 CN152 CNDC CNAC2 CN171 TBE1 TBE2 TBE3 TBE4 CNMC t° RT64 12-24V 208/230V~ CNDC CN702 CN701 CNF1...
Page 62: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4 Unit: inch (mm) Service port Compressor R.V. coil Discharge Service temperature Refrigerant flow in cooling port thermistor RT62 Refrigerant flow in heating Muffler High pressure switch Union Indoor unit ø 3/8 Stop valve with...
Page 63 MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4 Operating Range Indoor intake air temperature Outdoor intake air temperature Maximum 95°FDB, 71°FWB 115°FDB Cooling Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Heating Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION Piping length each indoor unit (a, b) 82 ft.
Page 64 MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 Unit: inch (mm) MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 R.V.coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port High pressure switch Compressor shell Muffler temperature thermistor Service port RT62 Union Header(Gas) ø 1/2 Stop valve Indoor unit A 4-way valve (with service port) ø...
Page 65 MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 Operating Range Indoor intake air temperature Outdoor intake air temperature Maximum 95°FDB, 71°FWB 115°FDB Cooling Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Heating Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION Piping length each indoor unit (a, b, c) 82 ft.
Page 66 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 Unit: inch (mm) R.V.coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Service port High pressure switch Compressor shell Muffler temperature thermistor Service port RT62 Union Header(Gas) Stop valve ø 1/2 4-way valve Indoor unit A (with service port) ø...
Page 67 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4 Operating Range Indoor intake air temperature Outdoor intake air temperature Maximum 95°FDB, 71°FWB 115°FDB Cooling Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Heating Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION Piping length each indoor unit (a, b, c, d) 82 ft.
Page 68 MXZ-5C42NA Unit: inch (mm) R.V.coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Compressor shell Service port temperature Oil separator thermistor RT62 High pressure switch Union Service port Header(Gas) ø 1/2 Indoor unit A 4-way valve ø 3/8 Indoor unit B Stop valve Header(Evaporator)
Page 69 MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-5C42NA4 Operating Range Indoor intake air temperature Outdoor intake air temperature Maximum 95°FDB, 71°FWB 115°FDB Cooling Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Heating Minimum 70°FDB, 60°FWB 6°FDB, 5°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION Piping length each indoor unit (a, b, c, d, e) 82 ft.
Page 70 MXZ-2C20NAHZ Unit: inch (mm) R.V.coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Compressor shell Service port temperature Oil separator thermistor RT62 High pressure switch Union Header(Gas) Service port ø 3/8 Indoor unit A 4-way valve Stop valve Header(Evaporator) (with service port) Outdoor...
Page 71 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 MXZ-2C20NAHZ4 Operating Range Indoor intake air temperature Outdoor intake air temperature Maximum 95°FDB, 71°FWB 115°FDB Cooling Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Heating Minimum 70°FDB, 60°FWB -12°FDB, -13°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION Piping length each indoor unit (a, b) 82 ft.
Page 72 MXZ-3C24NAHZ MXZ-3C30NAHZ Unit: inch (mm) R. V. coil Refrigerant flow in heating Refrigerant flow in cooling Accumulator Compressor Compressor shell Service port temperature Oil separator thermistor RT62 High pressure switch Union Header(Gas) Service port ø 1/2 4-way valve Indoor unit A Stop valve Header(Evaporator) ø...
Page 73 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 MXZ-3C24NAHZ4 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4 Operating Range Indoor intake air temperature Outdoor intake air temperature Maximum 95°FDB, 71°FWB 115°FDB Cooling Minimum 67°FDB, 57°FWB 14°FDB Maximum 80°FDB, 67°FWB 75°FDB, 65°FWB Heating Minimum 70°FDB, 60°FWB -12°FDB, -13°FWB MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION Piping length each indoor unit (a, b, c) 82 ft.
Page 74 PUMPING DOWN When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere. 1) Turn off the breaker. 2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit. 3) Fully close the stop valve on the liquid pipe side of the outdoor unit.
Page 75: Data
DATA Model MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4 Indoor type Non-Duct (09+09) Duct (09+12) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 18,000 22,000 20,000 22,000 – – – – – Input 1.417 1.641 2.000 1.771 Electrical Power supply (V, phase, Hz)
Page 76 Model MXZ-3C24NA4 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 – – – – – Input 1.61 1.74 2.10 1.89 Electrical Power supply (V, phase, Hz) 208/230, 1, 60 circuit Input 1.554...
Page 77 Model MXZ-3C30NA4 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 – – – – – Input 2.67 2.149 2.84 2.22 Electrical Power supply (V, phase, Hz) 208/230, 1, 60 circuit Input 2.614...
Page 78 Model MXZ-4C36NA4 Indoor type Non-Duct (09+09+09+09) Duct (09+09+09+09) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 35,400 36,000 34,400 34,400 – – – – – Input 3.76 3.01 3.94 3.09 Electrical Power supply (V, phase, Hz) 208/230, 1, 60 circuit Input 3.672...
Page 79 Model MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 MXZ-2C20NAHZ4 Indoor type Non-Duct (09+09) Duct (09+12) Item Unit Cooling Heating Cooling Heating Total Capacity Btu/h 18,000 22,000 20,000 22,000 – – – – – Input 1.34 1.62 1.82 1.75 Electrical Power supply (V, phase, Hz) 208/230, 1, 60 circuit Input...
Page 80 Model MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4 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 – – – – – Input 2.28 2.10 2.67 2.19 Electrical Power supply (V, phase, Hz) 208/230, 1, 60 circuit Input...
Page 81 9-1. OPERATING RANGE (1) POWER SUPPLY Model Rating Guaranteed Voltage MXZ-2C20NA2 MXZ-2C20NAHZ MXZ-2C20NA3 MXZ-2C20NAHZ2 MXZ-2C20NA4 MXZ-2C20NAHZ3 MXZ-3C24NA MXZ-2C20NAHZ4 MXZ-3C24NA2 MXZ-3C24NAHZ MXZ-3C24NA3 MXZ-3C24NAHZ2 MXZ-3C24NA4 MXZ-3C24NAHZ3 MXZ-3C30NA MXZ-3C24NAHZ4 MXZ-3C30NA2 MXZ-3C30NAHZ Min. 198 V 208 V 230 V Max. 253 V Outdoor unit...
Page 82 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NA2 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NA3 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 MXZ-5C42NA3 MXZ-2C20NA4 MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 MXZ-5C42NA4 MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 The standard specifications apply only to the operation of the air conditioner under normal conditions.
Page 83 9-2. CAPACITY AND THE INPUT CURVES MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4 Cooling capacity 11.7 11.4 10.7 10.5 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) Outdoor intake air Dry-bulb temperature (°F) Heating capacity 48.2 52.8 26.1 36.7 24.3 34.0 44.8 49.1 22.5...
Page 84 MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4 Cooling capacity 11.7 11.4 14.5 13.2 10.7 10.5 13.2 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) Outdoor intake air Dry-bulb temperature (°F) Heating capacity 26.1 36.7...
Page 85 MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-5C42NA4 Cooling capacity 11.7 11.4 14.5 13.2 10.7 10.5 13.2 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) Outdoor intake air Dry-bulb temperature (°F) Heating capacity 26.1 36.7 48.2 52.8 56.5 42.9 24.3 34.0 44.8...
Page 86 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 MXZ-3C24NAHZ4 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4 Cooling capacity 11.7 11.4 14.5 13.2 10.7 10.5 13.2 12.1 12.0 10.9 10.7 Outdoor intake air Dry-bulb temperature (°F) Total input (Cooling) Outdoor intake air Dry-bulb temperature (°F) Heating capacity 26.1 36.7...
Page 87 9-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4) 1. 06-class unit in single operation <HEAT>Total input <COOL>Total input <HEAT>Capacity <COOL>Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Total input...
Page 88 (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4) 1. 06-class unit in single operation <HEAT>Total input <COOL>Total input <HEAT>Capacity <COOL>Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Total input <COOL>Capacity Frequency Frequency...
Page 89: Class Unit In Single Operation Capacity
(OUTDOOR UNIT: MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-5C42NA4 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 MXZ-3C24NAHZ4 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4) 1. 06-class unit in single operation <HEAT>Total input <COOL>Total input <HEAT>Capacity <COOL>Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <HEAT>Capacity <HEAT>Total input <COOL>Total input...
Page 90: Class Unit In Single Operation
9-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 91 2. 09-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 92 3. 12-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 93 4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 94: Class Unit In Single Operation
5. 06-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 95 6. 09-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 96 7. 12-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 97 8. 15-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 98 9. 18-class unit in single operation (OUTDOOR UNIT: MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C24NA4 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 99 10. 24-class unit in single operation (OUTDOOR UNIT: MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-3C30NA4 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 100 11. 06-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-5C42NA3 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-5C42NA4 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1.
Page 101 12. 09-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-5C42NA3 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-5C42NA4 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1.
Page 102 13. 12-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-5C42NA4 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 MXZ-3C24NAHZ4 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1.
Page 103 14. 15-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-5C42NA4 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 MXZ-3C24NAHZ4 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1.
Page 104 15. 18-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-5C42NA4 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 MXZ-3C24NAHZ4 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 105 16. 24-class unit in single operation (OUTDOOR UNIT: MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-5C42NA4 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4) (1) COOL operation Data is based on the condition of indoor humidity <How to work fixed-frequency operation> 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed: High on indoor unit.
Page 106: Actuator Control
ACTUATOR CONTROL MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NA2 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NA3 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 MXZ-5C42NA3 MXZ-2C20NA4 MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 MXZ-5C42NA4 MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 Relation between main sensor and actuator Actuator...
Page 107: Service Functions
SERVICE FUNCTIONS MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NA2 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NA3 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 MXZ-5C42NA3 MXZ-2C20NA4 MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 MXZ-5C42NA4 MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 11-1. PRE-HEAT CONTROL If moisture gets into the refrigerant cycle, or when refrigerant is liquefied and collected in the compressor, it may interfere the startup of the compressor.
Page 108 11-2. AUTO LINE CORRECTING Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping. Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). When improper wiring or piping is detected, wiring lines are corrected. This will be completed in about 10 to 20 minutes.
Page 109 (1) Make sure there is no possibility of causing dew drop before making the setting. (2) Make the setting referring to the table below. SW2 on the outdoor control P.C. board MXZ-3C24NA3 MXZ-3C30NA3 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA3 MXZ-5C42NA3 MXZ-4C36NA MXZ-5C42NA MXZ-2C20NA3 MXZ-2C20NA2 MXZ-3C24NA2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-3C30NAHZ3 MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C24NA4 MXZ-3C30NA4 MXZ-3C30NAHZ MXZ-4C36NA4 MXZ-5C42NA4...
Page 110: Troubleshooting
TROUBLESHOOTING MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NA2 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NA3 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 MXZ-5C42NA3 MXZ-2C20NA4 MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 MXZ-5C42NA4 MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 12-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following: 1) Check the power supply voltage.
Page 111 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. *1 Regardless of normal or abnormal condition, 2 short Make sure that the remote controller is set to the failure mode recall function.
Page 112 • Refer to 12-6. "Check of outdoor temperature thermistor thermistors". 4-time blink Overcurrent Once Not lit 18 A (MXZ-2C20NA2, MXZ-2C20NA3, MXZ- • Reconnect compressor connector. 2C20NA4)/21 A (MXZ-3C24/3C30/4C36NA, • Refer to 12-6. "How to check MXZ-3C24/3C30/4C36NA2, MXZ-3C24/3C30/ inverter/compressor". 4C36NA3, MXZ-3C24/3C30/4C36NA4)/28 A •...
Page 113 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-4.). LED indication The left lamp of Indoor/outdoor (Outdoor P.C. OPERATION Abnormal point unit failure Condition Remedy board) INDICATOR lamp (Failure mode/protection) mode recall (Indoor unit) function LED 1 LED 2...
Page 114 12-3. INSTRUCTION OF TROUBLESHOOTING • Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit. Then, check the outdoor unit with referring to this page. Operation start Check the outdoor unit LED indicator.
Page 115 • Check the amount of gas and refrigerant circuit. 3 times Not lit Compressor can restart if discharge temperature protection • Refer to 12-6. "Check of LEV". thermistor reads 176°F (MXZ-2C20NA2, MXZ- 2C20NA3, MXZ-2C20NA4)/203°F (MXZ-3C24/ 3C30/4C36NA, MXZ-3C24/3C30/4C36NA2, MXZ- 3C24/3C30/4C36NA3, MXZ-3C24/3C30/ 4C36NA4)/212°F (MXZ-2C20/3C24/3C30NAHZ, MXZ-5C42NA, MXZ-2C20/3C24/3C30NAHZ2, MXZ-5C42NA2, MXZ-2C20/3C24/3C30NAHZ3, MXZ-5C42NA3, MXZ-2C20/3C24/3C30NAHZ4, MXZ-5C42NA4) or less 3 minutes later.
Page 116 12 times circuit protection (Outdoor • Replace the outdoor power P.C. board. compressor is operating. power P.C. board) 28 Outdoor unit The input current exceeds 15.0 A (MXZ-2C20NA2, operates. MXZ-2C20NA3, MXZ-2C20NA4)/18.4 A (MXZ- 3C24/3C30/4C36NA, MXZ-3C24/3C30/4C36NA2, MXZ-3C24/3C30/4C36NA3, MXZ-3C24/3C30/ Primary current These symptoms do not mean any abnormality of Once 4C36NA4)/26.8 A (MXZ-2C20/3C24/3C30NAHZ,...
Page 117 Indication Abnormal point / Symptom Condition Remedy Condition LED1(Red) LED2(Yellow) 35 Outdoor The room temperature is 75.2°F or more when 1 or High → Low unit oper- 2 unit(s) start(s) the heating operation. pressure bypass valve ates (MXZ-2C20/3C24/3C30NAHZ, MXZ-5C42NA, High pressure protec- normally.
Page 118 12-5. TROUBLESHOOTING CRITERION OF MAIN PARTS MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA MXZ-2C20NA2 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2 MXZ-2C20NA3 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 MXZ-5C42NA3 MXZ-2C20NA4 MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 MXZ-5C42NA4 MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 Part name Check method and criterion Defrost thermistor (RT61) Measure the resistance with a multimeter.
Page 119 Part name Check method and criterion High pressure switch(HPS) Pressure Normal 537 ± 22 PSIG Close PSIG Open Defrost heater Measure the resistance using a multimeter. (Part temperature: 14°F - 104°F) Normal MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 0.35 kΩ...
Page 120 Is the resistance of reactor normal? *1 Replace the reactor. Replace the outdoor power P.C. board. *1 MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-2C20NA2 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-2C20NA3 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 MXZ-2C20NA4 MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 Measuring points Resistance 1 Ω or less pin 1 – pin 2 1 Ω...
Page 121 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When OPERATION INDICATOR lamp blinks ON and OFF in every 0.5-second. Outdoor unit does not operate. How to check miswiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply.
Page 122 The cooling operation or heating operation does not operate. Check of R.V. coil • When cooling operation does not work, CNAC Outdoor control CN712 P.C. board 1. Disconnect the lead wire leading to the compressor. Outdoor power 2. 3 minutes after turning ON the power supply, start EMERGENCY CNAC2 P.C.
Page 123 Or, do you feel vibration of LEV coil with your hand? Disconnect the connectors. MXZ-2C CN791: LEV A, CN792: LEV B, CN797: LEV R (MXZ-2C20NA2, MXZ-2C20NA3, MXZ-2C20NA4) MXZ-3C/4C/5C Replace the outdoor control P.C. board. CN791: LEV A, CN792: LEV B, CN793: LEV C...
Page 124 • When heating, room does not get warm. • When cooling, room does not get cool. How to check inverter/compressor Disconnect the terminal of the compressor or the connector (CNMC) between the compressor and the outdoor power P.C. board. 3 minutes after the power supply is turned ON, start EMERGENCY OPERATION.
Page 125 • When thermistor is abnormal, Check of outdoor thermistors (MXZ-3C24/3C30/4C36NA, MXZ-3C24/3C30/4C36NA2, MXZ-3C24/3C30/4C36NA3, MXZ-3C24/3C30/4C36NA4) Disconnect the connector in the following table and Abnormal measure the resistance of the thermistor to check Replace the thermistor. whether the thermistor is normal or not. (Refer to 12-7.) (MXZ-5C42NA, MXZ-2C20/5C42NA2, Normal MXZ-2C20/5C42NA3, MXZ-2C20/5C42NA4,...
Page 126 • Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor CNF1 Outdoor control Disconnect CNF1 and measure the resistance of the outdoor fan motor. P.C. board Model name of fan motor*: Is the resistance of outdoor fan motor Replace the outdoor fan motor.
Page 127 • When the operation frequency does not go up from the lowest frequency. Check of HPS Outdoor control CN63H P.C. board 1. Disconnect the connector CN63H in the outdoor control P.C. board. 2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF. Replace HPS.
Page 128 12-7. TEST POINT DIAGRAM AND VOLTAGE Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) 1. Outdoor control P.C. board Outdoor heat exchanger temperature thermistor (RT68) MXZ-2C20NA2 MXZ-2C20NA3 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
Page 129 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-2C20NA4 Outdoor heat exchanger temperature thermistor (RT68) 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ ± 2% , B constant = 4014 ± 2% Rt = 13.36exp{4014( )} , t: ºC = (ºF - 32)/1.8 273+t...
Page 130 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-3C24NA MXZ-3C30NA Outdoor heat exchanger temperature thermistor (RT68) MXZ-4C36NA 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
Page 131 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-3C24NA2 MXZ-3C30NA2 Outdoor heat exchanger temperature thermistor (RT68) MXZ-4C36NA2 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
Page 132 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-3C24NA4 MXZ-3C30NA4 Outdoor heat exchanger temperature thermistor (RT68) MXZ-4C36NA4 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
Page 133 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-5C42NA Outdoor heat exchanger temperature thermistor (RT68) MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
Page 134 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-5C42NA2 Outdoor heat exchanger temperature thermistor (RT68) MXZ-5C42NA3 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
Page 135 1. Outdoor control P.C. board Discharge temperature thermistor (RT62) Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-5C42NA4 Outdoor heat exchanger temperature thermistor (RT68) MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 100 110 120 (ºC) (ºF) 104 122 140 158 176 194 212 230 248 Temperature Thermistor R100 = 13.36 kΩ...
Page 136 2. Outdoor power P.C. board MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4 Output to drive compressor CN171 Fin temperature thermistor CN152 (RT64) Signal Transmission (From Outdoor Control P.C. board) 5 V DC pulse wave Connect to earth CNAC2 208/230 V AC Output F1 FUSE T6.3AL250V...
Page 137 2. Outdoor power P.C. board MXZ-3C24NA MXZ-3C24NA2 MXZ-3C24NA3 MXZ-3C30NA MXZ-3C30NA2 MXZ-3C30NA3 MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 Output to drive compressor CN171 Fin temperature thermistor CN152 (RT64) Signal Transmission (From Outdoor Control P.C. board) 5 V DC pulse wave Connect to earth CNAC2 208/230 V AC Output F1 FUSE...
Page 138 2. Outdoor power P.C. board MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 CNDC CNAC1 Output to drive compressor Bus-bar voltage 208/230 V AC 290 - 370 V DC Output Connect to earth F2 FUSE 10A 250V F1 FUSE 10A 250V Connect to earth 208/230 V AC Input Connect to reactor Connect to reactor...
Page 139 2. Outdoor power P.C. board MXZ-5C42NA MXZ-5C42NA2 MXZ-5C42NA3 MXZ-2C20NAHZ MXZ-2C20NAHZ2 MXZ-2C20NAHZ3 MXZ-3C24NAHZ MXZ-3C24NAHZ2 MXZ-3C24NAHZ3 MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 CNDC Bus-bar voltage 290 - 370 V DC CN171 Output to drive compressor CNAC1 Connect to earth Fin temperature thermistor 208/230 V Output (RT64) F1 FUSE T6.3AL250V...
Page 140 2. Outdoor power P.C. board MXZ-5C42NA4 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 CNDC Bus-bar voltage 290 - 370 V DC CN171 Output to drive compressor CNAC1 Connect to earth Fin temperature thermistor 208/230 V Output (RT64) F1 FUSE 10A 250V CN152 F2 FUSE Signal 10A 250V Transmission...
Page 141: Disassembly Instructions
Locking lever Connector 13-1. MXZ-2C20NA2 MXZ-2C20NA3 MXZ-2C20NA4 : Indicates the visible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. : Indicates the invisible parts in the photos/figures.
Page 142 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the outdoor control P.C. board, the out- Photo 4 door power P.C. board and the reactor Electrical (1) Remove the service panel (Photo 1). box assembly (2) Disconnect the power supply cord and indoor/outdoor connecting wires. (3) Remove the top panel, the cabinet, and the back panel Catches of the (Photo 1, 2, 3).
Page 143 OPERATING PROCEDURE PHOTOS/FIGURES . Removing the fan motor Photo 8 Screws of the outdoor fan motor (1) Remove the service panel (Photo 1). (2) Disconnect the power supply cord and indoor/outdoor con- necting wires. Sound (3) Remove the top panel, the cabinet, and the back panel proof (Photo 1, 2, 3).
Page 144 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the expansion valve Photo 11 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.
Page 145 13-2. MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 Photos: MXZ-4C36NA MXZ-4C36NA2 MXZ-4C36NA3 MXZ-4C36NA4 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panels Photo 1 Screws of the top panel (1) Remove all the screws fixing the top panel, and remove the top panel.
Page 146 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the outdoor control P.C. board, the reac- Photo 6 tor, the outdoor power P.C. board, and the heatsink (1) Remove the top panel and the service panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor Catches of the connecting wires.
Page 147 OPERATING PROCEDURE PHOTOS/FIGURES (14) Disengage all the catches of the PB cover, and remove Photo 9 the PB cover (Photo 9). (15) Remove the screw fixing the outdoor power P.C. board and all the screws fixing the outdoor power P.C. board and the heatsink (Photo 10).
Page 148 OPERATING PROCEDURE PHOTOS/FIGURES Photo 12 Photo 13 (NA, NA2, NA3) Notch Lead wire of compressor Lead wire of CN171 Screws of fixing parts of the heat sink (NA4) Notch Lead wires of Lead wire of compressor CN171 3. Removing the fan motor Photo 14 (1) Remove the top panel, the service panel, and the front Propeller fan...
Page 149 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the compressor and 4-way valve Photo 15 (1) Remove the top panel, the service panel, and the front panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires, and remove the back panel. (3) Recover gas from the refrigerant circuit.
Page 150 13-3. MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2 MXZ-5C42NA3 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3 MXZ-5C42NA4 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4 Photos: MXZ-3C30NAHZ MXZ-3C30NAHZ2 MXZ-3C30NAHZ3 MXZ-3C30NAHZ4 NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the panels Photo 1 (1) Remove all the screws fixing the top panel, and remove Screws of the top panel the top panel.
Page 151 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the outdoor control P.C. board, the reac- Screw Photo 4 tor and the outdoor power P.C. board of the electrical (1) Remove the top panel, the service panel and the front parts panel (Refer to section 1). (2) Disconnect the power supply cord and indoor/outdoor connecting wires.
Page 152 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the fan motor Photo 9 (1) Remove the top panel, the service panel, and the front panel (Refer to section 1). Screw of the VB fixture Screws of the outdoor fan motor (2) Disconnect the power supply cord and indoor/outdoor connecting wires.
Page 153 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the expansion valve Photo 11 NOTE: Gas recovery is not required if the unit is pumped down. Discharge pipe Suction pipe (1) Remove the top panel and the service panel (Refer to brazed part brazed part section 1).
Page 154 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2022. No. OBH702 REVISED EDITION-N Issued: Aug. 2022. No. OBH702 REVISED EDITION-M Issued: Jun. 2022. No. OBH702 REVISED EDITION-L Issued: Dec. 2021. No. OBH702 REVISED EDITION-K Issued: Jul.

This manual is also suitable for:

Mxz-2c20na3 Mxz-2c20na4 Mxz-3c24na Mxz-3c24na2 Mxz-3c24na3 Mxz-3c24na4 ... Show all

Mitsubishi Electric MXZ-2C20NA2 Service Manual

Quick Links

Related Manuals for Mitsubishi Electric MXZ-2C20NA2

Summary of Contents for Mitsubishi Electric MXZ-2C20NA2

This manual is also suitable for:

Table of Contents