Page 1: Outdoor Unit
Please void OBH560 REVISED EDITION-F. SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH560 SERVICE MANUAL utilized REVISED EDITION-G R410A Models MXZ-2B20NA, - MXZ-3B24NA, - Indoor unit service manual MXZ-3B30NA, - MSZ-A·NA Series (OB450) MSZ-FD·NA Series (OBH497) MXZ-4B36NA, - MSZ-FE·NA Series (OBH542) MSZ-GE·NA Series (OBH548) MXZ-5B42NA MFZ-KA·NA Series(OBH568)
Page 2: Technical Changes
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. Revision A: • MXZ-2B20NA- has been added. Revision B: • MXZ-3B24NA and MXZ-4B36NA have been added.
Page 3: Part Names And Functions
1. Outdoor fan motor has been changed. 2. Outdoor electronic control P.C. board has been changed. MXZ-5B42NA New model PART NAMES AND FUNCTIONS MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA MXZ-2B20NA Air inlet Air inlet (Back and side) (Back and side) Air outlet Air outlet...
Page 4 SPECIFICATION Outdoor model MXZ-2B20NA, - Item Indoor type Non-Duct (09+09) Duct (09+12) Cooling 18,000 20,000 Btu/h Capacity Heating 47 22,000 22,000 Btu/h Heating 17 14,500 12,500 Btu/h Cooling 1,440 2,190 Power Heating 47 1,650 1,780 consumption Heating 17 1,500 1,430 Cooling 12.5...
Page 5 Outdoor model MXZ-3B24NA, - Indoor type Non-Duct (06+06+09) Duct (09+09+09) Item Cooling Btu/h 22,000 23,600 Capacity Heating 47 Btu/h 25,000 24,600 Heating 17 Btu/h 18,800 17,000 Cooling 1,760 2,460 Power Heating 47 1,750 1,900 consumption Heating 17 2,120 2,230 Cooling 12.5 Cooling SEER...
Page 6 Outdoor model MXZ-3B30NA, - Indoor type Non-Duct (09+09+12) Duct (09+09+12) Item Cooling Btu/h 28,400 27,400 Capacity Heating 47 Btu/h 28,600 27,600 Heating 17 Btu/h 18,800 18,000 Cooling 3,120 3,330 Power Heating 47 2,150 2,220 consumption Heating 17 2,120 2,140 Cooling SEER Cooling 17.5...
Page 7 Outdoor model MXZ-4B36NA, - Non-Duct (09+09+09+09) Duct (09+09+09+09) Indoor type Item Cooling Btu/h 35,400 34,400 Heating 47 Btu/h 36,000 34,400 Capacity Btu/h Heating 17 24,600 25,400 Cooling 3,760 3,940 Power Heating 47 3,020 3,100 consumption Heating 17 3,340 3,450 Cooling Cooling 18.0 15.0...
Page 8 Outdoor model MXZ-5B42NA Indoor type Non-Duct (06+09+09+09+09) Duct (09+09+09+09+09) Item Cooling Btu/h 40,800 37,200 Capacity Heating 47 Btu/h 45,200 41,200 Heating 17 Btu/h 30,500 31,100 Cooling 4,800 3,960 Power Heating 47 3,780 3,660 consumption Heating 17 4,850 4,950 Cooling SEER Cooling 18.4 14.5...
Page 9: Table Of Contents
NOISE CRITERIA CURVES MXZ-2B20NA MXZ-3B24NA FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE High Cooling High Cooling High Heating High Heating 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...
Page 10 MXZ-5B42NA FAN SPEED FUNCTION SPL(dB LINE High Cooling High Heating NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz OUTDOOR UNIT Test conditions 39.4 in. Cooling: Dry-bulb temperature 95°F Wet-bulb temperature 75°F MICROPHONE Heating: Dry-bulb temperature 45°F Wet-bulb temperature 43°F OBH560G...
Page 11: Mxz-2B20Na
OUTLINES AND DIMENSIONS MXZ-2B20NA Unit: inch Air in Air in Air out 1.Installation space Note : Leave front and both sides free of obstruction. Grounding terminal Conduit cover Note : Leave front and overhead Lock nut Connector free of obstruction.
Page 12: Mxz-3B24Na
MXZ-3B24NA Unit: inch MXZ-3B30NA 7-7/8" 19-11/16" 7-7/8" 9-27/32" 10-5/8" 2-U Shaped notched hole 1-3/8" (Base bolt M10) Air in Air in Drain hole 3- 1-5/16" Air out 2-(15/32" x 1-13/32") Oval hole (Base bolt M10) 3- 7/8"Punched hole (Connect wiring hole) 1-3/16"...
Page 13: Mxz-4B36Na
MXZ-4B36NA Unit: inch 7-7/8" 19-11/16" 7-7/8" 9-27/32" 10-5/8" 2-U Shaped notched hole 1-3/8" (Base bolt M10) Air in Air in Drain hole 3- 1-5/16" Air out 2-(15/32" x 1-13/32") Oval hole (Base bolt M10) 3- 7/8"Punched hole (Connect wiring hole) 1-3/16"...
Page 14: Installation Space
MXZ-5B42NA Unit: inch 2-U Shaped Noched Holes 7-7/8” 19-11/16” 7-7/8” (Foundation Bolt W3/8) 17-23/32” Air in Air in 1-21/32” Drain Hole Air out 2-(15/32”×1-13/32”) Oval Hole (Foundation Bolt W3/8) 35-7/16” 13/16” 12-19/32” 3/16” Handle 2-3/4” Handle Unit E Unit D 1/4”...
Page 15 WIRING DIAGRAM MXZ-2B20NA MXZ-2B20NA - OBH560G...
Page 16 MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA OBH560G...
Page 17 MXZ-3B24NA - MXZ-3B30NA - MXZ-4B36NA - OBH560G...
Page 18 MXZ-5B42NA OBH560G...
Page 19: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: inch MXZ-2B20NA Service port Compressor R.V. coil Discharge Service temperature Refrigerant flow in cooling port thermistor RT62 Refrigerant flow in heating Oil separator Capillary tube O.D.0.10 x I.D.0.02 x 39.37 Stop valve with Indoor unit service port...
Page 20 Operating Range MXZ-2B20NA 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 MXZ-2B20NA Piping length each indoor unit (a, b) 82 ft.
Page 21 MXZ-3B24NA Unit: inch Service port MXZ-3B30NA Compressor Service port Discharge R.V. coil temperature High-pressure Refrigerant flow in cooling thermistor RT62 switch Refrigerant flow in heating Oil separator Capillary tube O.D.0.10 I.D.0.02 39.37 Stop valve Indoor unit 4-way valve (with service port) Indoor unit Muffler Indoor unit...
Page 22 Operating Range MXZ-3B24NA MXZ-3B30NA 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 MXZ-3B24NA MXZ-3B30NA Piping length each indoor unit (a, b, c) 82 ft.
Page 23 MXZ-4B36NA Unit: inch Service port Compressor Service port Discharge R.V. coil temperature High-pressure Refrigerant flow in cooling thermistor RT62 switch Refrigerant flow in heating Oil separator Capillary tube Indoor unit O.D.0.10 x I.D.0.02 x 39.37 Stop valve 4-way valve (with service port) Indoor unit Indoor unit Muffler...
Page 24 Operating Range MXZ-4B36NA 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 MXZ-4B36NA Piping length each indoor unit (a, b, c, d) 82 ft.
Page 25 Unit: inch MXZ-5B42NA Compressor Discharge temperature thermistor RT62 R.V. coil Oil separator Service port Refrigerant flow in cooling High-pressure Refrigerant flow in heating Solenoid switch valve Capillary tube Indoor unit Service port O.D. 0.10 x 4-way valve I.D. 0.02 x 39.37 Stop valve Indoor unit (with service port)
Page 26 Operating Range MXZ-5B42NA 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 MXZ-5B42NA Piping length each indoor unit (a, b, c, d, e, f) 82 ft.
Page 27 DATA Model MXZ-2B20NA 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 1.44 1.65 2.19 1.78 Electrical Power supply (V, phase, Hz) 208/230, 1, 60...
Page 28 Model MXZ-3B30NA 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 3.12 2.15 3.33 2.22 Electrical Outdoor unit MXZ-3B30NA circuit Power supply (V, phase, Hz) 208/230, 1, 60 Input 3.047...
Page 29 Model MXZ-5B42NA 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 40,800 45,200 37,200 41,200 – – – – – Input 4.80 3.78 3.96 3.66 Electrical Outdoor unit MXZ-5B42NA circuit Power supply (V, phase, Hz) 208/230, 1, 60 Input 4.69...
Page 30 8-1. OPERATING RANGE (1) POWER SUPPLY Guaranteed Voltage Model Rating MXZ-2B20NA MXZ-3B24NA Min. 198 V 208 V 230 V Max. 253 V 208/230 V 60 Hz 1 Outdoor unit MXZ-3B30NA MXZ-4B36NA MXZ-5B42NA (2) OPERATION Intake air Indoor Outdoor temperature Function Condition DB (°F)
Page 31: Specification
MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA MXZ-5B42NA The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed, the following information has been pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
Page 32 8-2. CAPACITY AND THE INPUT CURVES MXZ-2B20NA Cooling capacity (at Rated frequency) 11.2 13.5 14.4 Indoor intake air Wet-bulb 10.3 12.4 13.1 temperature(°F) 11.5 12.1 10.4 11.2 10.1 Outdoor intake air Dry-bulb temperature(°F) Total input (Cooling : at Rated frequency...
Page 33 MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Cooling capacity (at Rated frequency) 11.2 13.5 13.1 16.7 19.3 Indoor intake air Wet-bulb 10.3 12.4 12.2 15.5 17.8 temperature(°F) 14.2 16.2 11.5 11.2 10.4 10.3 13.0 14.8 11.7 13.3 10.6 12.1 10.6 Outdoor intake air Dry-bulb temperature(°F) Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb...
Page 34 MXZ-5B42NA Cooling capacity (at Rated frequency) 11.2 13.5 13.1 16.7 19.3 Indoor intake air Wet-bulb 10.3 12.4 12.2 15.5 17.8 temperature(°F) 11.5 11.2 14.2 16.2 10.4 10.3 13.0 14.8 11.7 13.3 10.6 12.1 10.6 Outdoor intake air Dry-bulb temperature(°F) Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature( F)
Page 35 8-3. CAPACITY AND INPUT CORRECTION BY MEANS OF INVERTER OUTPUT FREQUENCY (OUTDOOR UNIT: MXZ-2B20NA) 1. 06-class unit in single operation <COOL>Total input <HEAT>Capacity <HEAT>Total input <COOL>Capacity Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input...
Page 36 (OUTDOOR UNIT: MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) 1. 06-class unit in single operation <COOL>Total input <COOL>Capacity <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 3. 12-class unit in single operation <COOL>Capacity <COOL>Total input <HEAT>Total input...
Page 37: Data.
(OUTDOOR UNIT: MXZ-5B42NA) 1. 06-class unit in single operation <HEAT>Capacity <COOL>Capacity <COOL>Total input <HEAT>Total input 12.5 25.0 12.5 25.0 Frequency Frequency Frequency Frequency 2. 09-class unit in single operation <COOL>Total input <HEAT>Capacity <COOL>Capacity <HEAT>Total input 12.5 25.0 Frequency Frequency Frequency Frequency 3.
Page 38 8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. 06-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA) (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 39 2. 09-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA) (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 40 3. 12-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA) (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 41 4. 15-class unit in single operation (OUTDOOR UNIT: MXZ-2B20NA) (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 42 5. 06-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 43 6. 09-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 44 7. 12-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 45 8. 15-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 46 9. 18-class unit in single operation (OUTDOOR UNIT : MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 47 10. 24-class unit in single operation (OUTDOOR UNIT : MXZ-4B36NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 48 11. 06-class unit in single operation (OUTDOOR UNIT : MXZ-5B42NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 49 12. 09-class unit in single operation (OUTDOOR UNIT : MXZ-5B42NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 50 13. 12-class unit in single operation (OUTDOOR UNIT : MXZ-5B42NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 51 14. 15-class unit in single operation (OUTDOOR UNIT : MXZ-5B42NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 52 15. 18-class unit in single operation (OUTDOOR UNIT : MXZ-5B42NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 53 16. 24-class unit in single operation (OUTDOOR UNIT : MXZ-5B42NA) (1) COOL operation Data is based on the condition of indoor <How to work fixed-frequency operation> humidity 50% 1. Set emergency switch to COOL or HEAT. The switch is located Air flow speed : High on indoor unit.
Page 54: Actuator Control
Turn OFF the power supply for the air conditioner before making the setting. Set the "4" of SW1 on the electronic control P.C. board to ON to deactivate pre-heat control function (MXZ-2B20NA). Set the "4" of SW2 on the electronic control P.C. board/outdoor control P.C. board to ON to deactivate pre-heat control function (MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA, MXZ-5B42NA).
Page 55 10-2. AUTO LINE CORRECTING <MXZ-3B24NA, MXZ-3B30NA, MXZ-4B36NA, MXZ-5B42NA> 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.
Page 56: Troubleshooting
TROUBLESHOOTING MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA MXZ-5B42NA 11-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing. 1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
Page 57 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. Make sure that the remote controller is set to the failure mode recall function. 1 Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.
Page 58 3. Outdoor unit failure mode table MXZ-2B/3B/4B LED indication The left lamp of Indoor/out- (Outdoor P.C. OPERATION IN- Abnormal point door unit Condition Remedy board) DICATOR lamp (Failure mode/protection) failure mode (Indoor unit) recall function LED 1 LED 2 None (Normal) Lighted Lighted 2-time ﬂ...
Page 59: Cooling
MXZ-5B LED indication The left lamp of Indoor/out- (Outdoor P.C. OPERATION IN- Abnormal point door unit Condition Remedy board) DICATOR lamp (Failure mode/protection) failure mode (Indoor unit) recall function LED 1 LED 2 None (Normal) Lighted Lighted 2-time ﬂ ash Outdoor power system Lighted Lighted Overcurrent protection cut-out operates 3 •...
Page 60 MXZ-5B Upper or Indoor/out- left lamp of LED indication door unit OPERATION Abnormal point (Outdoor P.C. Condition Remedy failure mode INDICATOR (Failure mode/protection) board) recall func- lamp (Indoor tion unit) 11-time ﬂ ash Communication error between Lighted 6 times Communication error occurs between the out- •...
Page 61: Heating
P.C. board, noise filter P.C. board and power board. Outdoor electronic control P.C. board (Parts side) NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. MXZ-2B20NA 2. LED is lighted during normal operation. LED2 LED1 The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
Page 62 NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. Outdoor electronic control P.C. board(Parts side) 2. LED is lighted during normal operation. MXZ-2B20NA The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. LED2 LED1 (Example) When the flashing frequency is “2”.
Page 63 MXZ-5B Indication Abnormal point / Symptom Condition Remedy Condition LED1(Red) LED2(Yellow) Outdoor The indoor unit detects an abnormality in the LEV • Refer to 11-6. "Check of LEV". Lighted Once LEV and drain pump unit does and drain pump. • Check the drain pump of the indoor unit. not operate.
Page 64 Indication Abnormal point / Symptom Condition Remedy Condition LED1(Red) LED2(Yellow) 17 'Outdoor After the operation starts, a short or open circuit • Replace the outdoor power P.C. board . Current sensor unit stops Lighted 8 times is detected in the current sensor when the protection and restarts compressor is not operating.
Page 65 11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA MXZ-5B42NA Part name Check method and criterion Defrost thermistor (RT61) Fin temperature Measure the resistance with a tester. thermistor (RT64) MXZ-2B/3B/4B Refer to 11-7. “Test point diagram and voltage”,1. “Electronic control P.C. board”, Ambient temperature 2.”Outdoor control P.C.board”, 4.
Page 66: Troubleshooting
11-6. TROUBLESHOOTING FLOW MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Outdoor unit does not operate. Check of power supply Check the main power supply circuit for proper connections. Turn ON the power supply. Is there voltage of 208/230 V AC in the Check the power supply cable.
Page 67 Check the wiring. outdoor terminal block S1 and NOTE: "Lighting" in the table below does not S2 ? indicate abnormal communication. MXZ-2B20NA Press EMERGENCY OPERATION switch once. Outdoor electronic control P.C. board (Parts side) Does the left lamp of OPERATION...
Page 68 The cooling operation or heating operation does not operate. Check of R.V. coil CN912 Noise filter P.C. board MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA CN781 Electronic control P.C. board • When heating operation does not work. 1. Disconnect the lead wire leading to the compressor.
Page 69 MXZ-5B42NA • When heating operation does not work. CN711 Outdoor control 1. Disconnect the lead wire leading to the compressor. CN712 P.C. board 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage 208/230V AC Replace the outdoor Is there voltage of 208/230V AC between pin 1 between the pin 1 and pin 3 at...
Page 70 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit gets warm. Check of LEV MXZ-2B/ MXZ-5B 3B/4B CN791 Turn ON the power supply to the outdoor unit after checking LEV coil is CN792 Outdoor Electronic mounted to the LEV body securely.
Page 71 • 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 power board/outdoor power P.C. board. 3 minutes after the power supply is turned ON, start EMERGENCY OPERATION.
Page 72 Does the unit operate 10 minutes or more without Replace the electronic control P.C. board/outdoor showing thermistor abnormality ? control P.C. board or the power board. Normal MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Thermistor Symbol Connector, Pin No. Board Between CN661 pin1 and pin2...
Page 73 MXZ-5B42NA CN931 Outdoor control Disconnect CN931 and measure the P.C. board resistance of the outdoor fan motor. Is the resistance of outdoor fan motor Measuring points Resistance Replace the outdoor fan motor. normal? (Refer to right table) pin 1 - pin 4 pin 5 - pin 4 60 kΩ...
Page 74 • When the operation frequency does not go up from the lowest frequency. MXZ-3B/4B MXZ-5B Check of HPS Outdoor control Electronic CN681 control P.C. board P.C. board MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA MXZ-5B42NA 1. Disconnect the connector CN681 in the electronic control P.C. board. 2.
Page 75 11-7. TEST POINT DIAGRAM AND VOLTAGE Defrost thermistor (RT61) Ambient temperature thermistor (RT65) 1. Electronic control P.C. board Discharge temperature thermistor (RT62) Outdoor heat exchanger temperature MXZ-2B20NA thermistor (RT68) 86 104 122 140 158 176 194 212 230 248 Temperature (°F) Temperature (°F) LED 1...
Page 76 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA Outdoor heat exchanger Discharge temperature thermistor (RT62) temperature thermistor (RT68) 86 104 122 140 158 176 194 212 230 248 Temperature (°F) 86 104 Temperature (°F) LED 1 LED 2 LED 3 F931 FUSE...
Page 77 Defrost thermistor (RT61) 2. Outdoor control P.C. board Discharge temperature thermistor (RT62) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature MXZ-5B42NA thermistor (RT68) 100 110 120 Temperature (°C) 325-350V DC CN781 X64A to outdoor power P.C. X64B board Temperature (°C) 12V DC CN931 to fan moter 15V DC...
Page 78 3. Noise filter P.C. board MXZ-2B20NA CN901 CN903 CN902 To electronic To power To power control P.C. board board board CN912 CN61 R.V. coil 208/230 V AC 208/230 V AC Output 208/230 V AC Output FUSE T6.3AL250V 208/230 V AC...
Page 79 4. Power board Fin temperature thermistor (RT64) MXZ-2B20NA DM00N019 or DM00N095 32 50 68 86 104 122 140 158 176 Temperature (°F) Connect to the compressor Voltage among phases: 5 V to 180 V Connect to the earth 294-370 V DC...
Page 80 Fin temperature thermistor (RT64) MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA 32 50 68 86 104 122 140 158 176 Temperature (°F) Connect to the compressor Voltage among phases: 5 V to 180 V Connect to the earth 294-370 V DC Output (Red) Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C.
Page 81 5. Outdoor power P.C. board MXZ-5B42NA 17V DC To outdoor control P.C. board 18V DC Signal To outdoor control transmission 12V DC P.C. board CN911 X64B Signal To outdoor control P.C. board reception X64A CN61 208/230V AC Output FUSE(F65N) T6.3AL250V FUSE(F65L) T6.3AL250V CN912...
Page 82: Disassembly Instructions
Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MXZ-2B20NA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the compressor Photo 1 Screws of the (1) Remove the screws of the top panel, and remove the top top panel panel.
Page 83 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the electronic control P.C. board (1) Remove the screws of the sub panel. (2) Remove the sub panel. (3) Disconnect all connectors and lead wires on the electronic control P.C. board. (4) Remove the electronic control P.C. board. Screw of the rear guard Screws of Photo 3...
Page 84 OPERATING PROCEDURE PHOTOS 4. Removing the 4-way valve Photo 7 (1) Remove the top panel (Photo 1). (2) Remove the service panel, the cabinet, and the back panel (Photo 1, 2, 3). 4 way valve (3) Recover gas from the refrigerant circuit. Recover gas from the pipes until the pressure gauge NOTE: shows 0 PSIG.
Page 85 12-2. MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA NOTE: Turn OFF the power supply before disassembly. Photo : MXZ-3B24NA OPERATING PROCEDURE PHOTOS Screws of the top panel Photo 1 1. Removing the compressor (1) Remove the screws of the top panel, and remove the top panel.
Page 86 Photo : MXZ-3B24NA OPERATING PROCEDURE PHOTOS Screws of the outdoor fan motor 2. Removing the fan motor Photo 5 (1) Remove the top panel, the service panel, and the front panel (Photo 1, 2). (2) Disconnect the connectors CN931 and CN932 on the outdoor electronic control P.C.
Page 87 Photo : MXZ-3B24NA OPERATING PROCEDURE PHOTOS 5. Removing the reactor Photo 8 (1) Remove the top panel (Photo 1, 2). (2) Disconnect the reactor lead wire. (3) Remove the screws of the reactor, and remove the reactor. Screws of the reactor OBH560G...
Page 88 12-3. MXZ-5B42NA NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the panels Photo 1 Screws of the top panel (1) Remove the screws of the service panel, and remove the service panel. (2) Remove the screws of the top panel, and remove the top panel.
Page 89 OPERATING PROCEDURE PHOTOS 2. Removing the outdoor control P.C. board, the reac- Photo 3 tor and the outdoor power P.C. board (1) Remove the service panel and the top panel (Photo 1). (2) Disconnect the connectors on the outdoor control P.C. board.
Page 90 OPERATING PROCEDURE PHOTOS 3. Removing the fan motor Photo 8 (1) Remove the top panel, the service panel, and the front Screws of the outdoor fan motor panel (Photo 1). (2) Disconnect the connector CN931 on the outdoor control P.C. board. (3) Remove the propeller.
Page 91 OPERATING PROCEDURE PHOTOS 5. Removing the expansion valve Photo 10 Expansion (1) Remove the top panel (Photo 1). valves (2) Remove the service panel (Photo 1). (Gas recovery is not required if the unit is pumped down.) (3) Remove the front panel for removing LEV M (Photo 1). (4) Remove the electrical parts for removing LEV M (Photo 3, 4).
Page 92 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2009 MITSUBISHI ELECTRIC CORPORATION Distributed in Jun. 2013. No. OBH560 REVISED EDITION-G Distributed in Dec. 2011. No. OBH560 REVISED EDITION-F Distributed in Jun. 2011. No. OBH560 REVISED EDITION-E Distributed in Jan.
Page 93 MXZ-2B20NA MXZ-2B20NA-1 COOLING...
Page 94 MXZ-2B20NA MXZ-2B20NA-1 HEATING...
Page 95 MXZ-3B24NA MXZ-3B24NA-1 COOLING...
Page 96 MXZ-3B24NA MXZ-3B24NA-1 COOLING...
Page 97 MXZ-3B24NA MXZ-3B24NA-1 HEATING...
Page 98 MXZ-3B24NA MXZ-3B24NA-1 HEATING...
Page 99 MXZ-3B30NA MXZ-3B30NA-1 COOLING...
Page 100 MXZ-3B30NA MXZ-3B30NA-1 COOLING...
Page 101 MXZ-3B30NA MXZ-3B30NA-1 COOLING...
Page 102 MXZ-3B30NA MXZ-3B30NA-1 HEATING...
Page 103 MXZ-3B30NA MXZ-3B30NA-1 HEATING...
Page 104 MXZ-3B30NA MXZ-3B30NA-1 HEATING...
Page 105 MXZ-4B36NA COOLING...
Page 106 MXZ-4B36NA COOLING...
Page 107 MXZ-4B36NA COOLING...
Page 108 MXZ-4B36NA COOLING...
Page 109 MXZ-4B36NA COOLING...
Page 110 MXZ-4B36NA HEATING...
Page 111 MXZ-4B36NA HEATING...
Page 112 MXZ-4B36NA HEATING...
Page 113 MXZ-4B36NA HEATING...
Page 114 MXZ-4B36NA HEATING...
Page 115 MXZ-4B36NA-1 COOLING...
Page 116 MXZ-4B36NA-1 COOLING...
Page 117 MXZ-4B36NA-1 COOLING...
Page 118 MXZ-4B36NA-1 COOLING...
Page 119 MXZ-4B36NA-1 COOLING...
Page 120 MXZ-4B36NA-1 HEATING...
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Page 122 MXZ-4B36NA-1 HEATING...
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Page 124 MXZ-4B36NA-1 HEATING...
Page 125 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination power consumpution (W) factor (%) Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total 208V...
Page 126 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 127 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 128 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 129 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 130 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 131 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 132 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 133 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 134 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 135 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 136 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 137 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 138 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 139 MXZ-5B42NA COOLING Indoor type Cooling Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 140 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power power consumpution (W) combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total 208V 230V...
Page 141 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 142 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 143 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 144 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 145 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 146 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 147 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 148 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 149 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 150 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 151 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 152 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 153 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)
Page 154 MXZ-5B42NA HEATING Indoor type Heating Capacity (BTU/h) Current (A) Current (A) Indoor units Outdoor unit Power combination Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E Total power consumpution (W) 208V 230V factor (%)

This manual is also suitable for:

Mxz-3b24na Mxz-3b30na Mxz-4b36na Mxz-5b42na

Mitsubishi Electric MXZ-2B20NA Service Manual

Mxz-2B20Na

Mxz-3B24Na

Mxz-3B30Na

Mxz-4B36Na

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