Daikin FTXB50BV1B Service Manual Download Page 1

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SERVICE MANUAL

Inverter

:DOO0RXQWHG

Single Split

SM-5WMY-A1

R410A

Summary of Contents for FTXB50BV1B

Page 1: ...SERVICE MANUAL Inverter DOO 0RXQWHG Single Split SM 5WMY A1 R410A...

Page 2: ...6 2 9 Minimum Off Time Control 16 2 10 Auto Restart 17 2 11 Auto Random Restart 17 2 12 Four Way Valve Control 17 2 13 Outdoor Fan Control 18 2 14 Rotation Regulating Functions 18 2 15 Defrost Cycle 2...

Page 3: ...mbling the equipment for a repair Working on the equipment that is connected to a power supply can cause an electrical shook If it is necessary to supply power to the equipment to conduct the repair o...

Page 4: ...el and appropriate tools to conduct repair work Never attempt to modify the equipment The use of inappropriate parts or tools can cause an electrical shock excessive heat generation or fire When reloc...

Page 5: ...ent the refrigerant gas from leaking into the room The refrigerant gas itself is harmless but it can generate toxic gases when it contacts flames such as fan and other heaters stoves and ranges When r...

Page 6: ...easure the insulation resistance after the repair and make sure that the resistance is 1 Mohm or higher Faulty insulation can cause an electrical shock Be sure to check the drainage of the indoor unit...

Page 7: ...0 60BV1B x x x x FTXN25 35 50 60MV1 x x x x FTXN25 35 50 60MV1B x x x x FTXN25 35 50 60MV1B9 x x x x ATXN25 35 50 60MV1B x x x x 1 1 2 Outdoor Unit Nomenclature Classification Refrigerant control Fin...

Page 8: ...TXN25 35L M 1 2 1 1 Main PCB Item Indication on PCB Description 1 A1 Connector for fan motor 2 A2 Connector for swing motor 3 A3 Connector for fan motor feedback 4 A4 Fuse 5 A5 Varistor 6 A6 Connector...

Page 9: ...er Single Split 3 1 2 1 2 Signal board Item Indication on PCB Description 1 A1 Operation ON OFF switch 2 A2 Led for sleep red 3 A3 Led for timer yellow 4 A4 Led for operation 5 A5 Connector for contro...

Page 10: ...N50 60L M 1 2 2 1 Main PCB Item Indication on PCB Description 1 A1 Connector for fan motor 2 A2 Connector for swing motor 3 A3 Connector for wired panel 4 A4 Connector for Signal Receiver PCB 5 A5 Con...

Page 11: ...er Single Split 5 1 2 2 2 Signal board Item Indication on PCB Description 1 A1 Connector for Control PCB 2 A2 LED for operation 3 A3 LED for timer yellow 4 A4 LED for sleep red 5 A5 Operation ON OFF s...

Page 12: ...Inverter Single Split 6 1 2 3 Outdoor PCB ARXN RXN25 35L M 1 2 3 1 Filter PCB Item Indication on PCB Description 1 S11 Connector for indoor PCB 2 FU3 Fuse 20A 3 V2 V3 Varistor...

Page 13: ...tronic expansion valve coil 3 S40 Connector for overload protector 4 S70 Connector for fan motor 5 S80 Connector for four way valve coil 6 S90 Connector for thermistors outdoor temperature outdoor hea...

Page 14: ...on on PCB Description 1 S11 Connector for S10 on main PCB 2 HL1 HN1 S Connector for terminal board 3 E1 E2 Terminal for earth wire 4 HL2 HN2 Connector for HL3 HN3 on main PCB 5 HL4 HN4 Connector for S...

Page 15: ...lve coil 4 S40 Connector for overload protector 5 S50 Connector for magnetic relay 6 S70 Connector for fan motor 7 S80 Connector for four way valve coil 8 S90 Connector for thermistors outdoor tempera...

Page 16: ...ctor for IPM PCB 2 A2 Connector for heat sink thermistor 3 A3 Connector for thermistors outdoor air heat exchanger discharge pipe 4 A4 Connector for electronic expansion valve coil 5 A5 A6 Connector f...

Page 17: ...ngle Split 11 1 2 5 2 IPM board Item Indication on PCB Description 1 A1 A2 A3 Connector to compressor 1 2 5 3 Display board Item Indication on PCB Description 1 A1 Connector to control PCB 2 A2 7 segm...

Page 18: ...tion Model Max total piping length m Max height difference m Pre charge for up to piping length m Additional charge g m ARXN RXN25M 20 10 7 5 20 ARXN RXN35M 20 10 7 5 20 ARXN RXN50M RXB50B RX50CG 30 1...

Page 19: ...ng Mode Operation The system has 5 operating modes The mode selection is done from indoor using handset The operating modes are Cool Heat Fan Auto Dry 2 2 1 Cooling Mode When Tr Ts 1 5 C Compressor In...

Page 20: ...Fan speed will maintain same as during fan mode 2 4 Auto Mode Automatic Cooling Heating Function When the automatic operation is selected with the remote controller the microcomputer automatically det...

Page 21: ...sleep operation operation OFF signal run sleep operation 1hr 1hr shift 0 5 C shift 1 0 C shift 1 0 C shift 2 0 C target temperature COOL or DRY target temperature HEAT no offset on target temperature...

Page 22: ...Valve EXV control Outdoor coil Used for defrost control Also used for inverter current protection control in Series II Outdoor air Used for defrost outdoor fan speed control Also used for overall cur...

Page 23: ...the auto random restart function kindly cut off the jumper J_AUTO as highlighted in attachment Please be informed that after disable auto random restart unit is not able to restart with last state mem...

Page 24: ...Target rotation Defrost control for heat pump model only 2 14 1 Starting Rotation Starting Control To avoid excessive oil discharge from compressor or to promote oil lubrication during startup To prev...

Page 25: ...ference from the previously calculated rotation I control if the operating frequency is not changed more than a certain fixed time If T is small lower frequency If T is large increase frequency 2 14 5...

Page 26: ...more than 180s Compressor will stop OD fan stop after 30s and indoor fan can only run at lowest fan speed The unit can only be restarted after 3 minutes When the indoor coil temperature 13 C the compr...

Page 27: ...protection is activated when the compressor discharge temperature 110 C The compressor will stop and considered trip If the compressor discharge temperature 90 C the compressor frequency will be rese...

Page 28: ...N25 35L M 14 0A ARXN RXN50 60_L 12 0A ARXN RXN50 60M RXB50 60B RX50 60CGXV1 16 5A When the input current for running compressor exceeds L2 running frequency will be reduced by 1 step If current still...

Page 29: ...e 1 Hold down ON TIMER CANCEL or OFF TIMER CANCEL for 5 seconds until indication flashes on the handset temperature display section 2 Then press the same button repeatedly A series of error code will...

Page 30: ...Repeat the normal step to retrieve error by using remote controller step Holding TIMER CANCEL 9 By using this method the error shown will be Last State Error Previous error in this unit 3 1 3 Error Co...

Page 31: ...nning number shows the parameter number Then the 7 segment will flash again showing the parameter measurement When the 7 segment display is left untouched for 5 min the display will light off Dim Para...

Page 32: ...E8 AC INPUT OVER CURRENT O O 12 EA 4 WAY VALVE ABNORMALITY O O 13 F3 DISCHARGE PIPE OVERHEAT O O 14 F6 HEAT EXCHANGER OVERHEAT O O 15 H0 COMPRESSOR SENSOR SYSTEM ABNORMAL O 16 H6 POSITION SENSOR ABNO...

Page 33: ...door PCB 2 Faulty connector connection at indoor Troubleshooting No Any sign of loose or abnormal Yes Turn off unit Check indoor PCB connector conditions including PCB to terminal block and all PCB wi...

Page 34: ...short circuit Does it conform to the thermistor resistance table Yes No Check indoor air flow Check intake air filter Check fan blower condition Change indoor thermistor Check the dust accumulate ind...

Page 35: ...Turn off power supply and rotate fan by hand No Connect correctly Change fan motor C4 Description INDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY Supposed Cause 1 Thermistor connector faulty 2 Indoor PC...

Page 36: ...Cause 1 Thermistor connector faulty 2 Indoor PCB faulty Troubleshooting Yes Normal No Yes Normal Refer thermistor resistance table Page 60 item 6 1 Replace PCB Check thermistor resistance value Check...

Page 37: ...Momentary voltage drop Momentary power failure 2 Damage of EEPROM 3 Faulty outdoor unit PCB 4 Broken hardness between PCB Troubleshooting Error still occur No Yes Grounded Yes Turn on the power again...

Page 38: ...e electronic expansion or the coil Discharge pipe thermistor disconnected No Yes Insert thermistor in position Check resistance of 2 terminals connector S40 Malfunction Resistance between 2 WHUPLQDOV...

Page 39: ...er page 61 item 6 3 5HIHU SDJH LWHP Resistance IROORZ VSHF No Yes Compressor stop without UXQQLQJ No Yes Change outdoor PCB Change compressor Turn off unit Disconnect compressor wire hardness U V W an...

Page 40: ...valve coil Replace it as required Emergency stop without compressor running No Yes Replace the compressor Yes Replace the compressor System shut down after errors repeated several times No Turn off po...

Page 41: ...Troubleshooting Turn on the power Check rotation pulse input on outdoor unit PCB Fan rotates smoothly No Yes Turn off power and reconnect connector Fan motor connector disconnected No Yes Foreign mat...

Page 42: ...Change outdoor Control Box Check with the inverter checker Check outdoor fan motor outdoor ambient temperature refrigerant charge level Turn off the power and disconnect the harness U V and W No Refer...

Page 43: ...ur way valve coil Replace the defective thermistor s Malfunction Replace the outdoor unit PCB Reconnect the thermistor s Reconnect the harness Resistance between harnesses No Yes Any thermistor discon...

Page 44: ...tor Outdoor temperature thermistor Functioning Functioning Replace the defective thermistor s Check the refrigerant line Malfunction Refrigerant shortage Four way valve Water mixed Stop valve Function...

Page 45: ...tallation condition Functioning Functioning Functioning Functioning Malfunction Change the installation location or direction Clean the outdoor heat exchanger Replace the outdoor fan motor Reconnect t...

Page 46: ...arness 2 Outdoor unit PCB defective 3 Defective compressor Troubleshooting Disconnect the reactor wire and measure resistance between terminal Any abnormal Yes No Check reactor connection Check reacto...

Page 47: ...Yes No problem Keep on running No Replace the harness Replace the PCB Check the harness S30 H0 ARXN RXN50 60L M Description COMPRESSOR SENSOR SYSTEM ABNORMAL Supposed Cause 1 Broken and disconnected h...

Page 48: ...losed 5 Input voltage out of specification Troubleshooting Normal Compressor harness connected as specified No Yes Check for short circuit Check with inverter checker Check the electrolytic capacitor...

Page 49: ...sses connected as specified No Yes Check for short circuit Check with inverter checker Check the electrolytic capacitor voltage Turn off the power Disconnect the harness U V and W Replace the outdoor...

Page 50: ...he power Check the electrolytic capacitor voltage Any LED off No Correct the power supply or replace the outdoor unit PCB Reconnect the electrical components or compressor harnesses as specified Elect...

Page 51: ...PCB defective Troubleshooting Connection correct No Yes Change outdoor PCB Restart the system and check connector between main board and IPM board Check compressor harness connection Does it connect p...

Page 52: ...ting No Yes Turn on the power again Check the indoor heat exchanger thermistor resistance value in the heating operation Check the thermistor resistance value Normal J3 error the discharge pipe temper...

Page 53: ...at sink thermistor resistance Change heat sink or check outdoor fan condition Turn off the unit and turn on back after 20 mins Resistance normal Heat sink temperature A C No Yes Outdoor fan functionin...

Page 54: ...em Has the PCB been replaced Above A C Check the radiation fin temperature Check the outdoor fan Malfunction No Functioning Radiation fin dirty Yes Check if silicon grease is applied properly on the r...

Page 55: ...ion condition Check with the inverter analyzer Check the power supply voltage Turn off the power and turn it on again to start the system See if the same error occurs No Turn off the power and reconne...

Page 56: ...thermistor Put the thermistor back to actual position Check the indoor coil outdoor coil and discharge pipe thermistor resistance Thermistor in actual position Resistance normal EXV functioning Any l...

Page 57: ...bleshooting Is the voltage fluctuation within 10 from the rated value No Yes Yes Check the power supply voltage Turn on the power Check the connection of the compressor harness Yes Disturbance factors...

Page 58: ...the indoor unit outdoor unit connection wires No Check the LED A on the outdoor unit PCB Check the power supply waveform Check the voltage of the connection wires on the indoor terminal board between...

Page 59: ...ng outdoor unit PCB mounted or defective Troubleshooting OK No Yes Are the connecting wires connected properly Yes No Correct the connection Match the compatible models Matched compatibly No Yes Chang...

Page 60: ...Wiring Connection 54 4 0 Wiring Connection Model ATXN FTXN 25 35L M ARXN RXN 25 35L M...

Page 61: ...Wiring Connection 55 Model ATXN FTXN 50 60L ARXN RXN 50 60L...

Page 62: ...Wiring Connection 56 Model ATXN FTXN 50 60M ARXN RXN 50 60M...

Page 63: ...NDOOR UNIT OUTDOOR UNIT PIPING GAS PIPING LIQUID 2 WAY VALVE STRAINER STRAINER ELECTRONIC EXPANSION VALVE 3 WAY VALVE DISCHARGE PIPE THERMISTOR ACCUMULATOR COMPRESSOR MUFFLER MUFFLER AIR THERMISTOR HE...

Page 64: ...0 3 3 18E 01 3 26E 01 3 33E 01 47 44 4E 00 4 52E 00 4 60E 00 2 3 04E 01 3 11E 01 3 18E 01 48 4 29E 00 4 37E 00 4 42E 00 1 2 90E 01 2 97E 01 3 03E 01 49 4 15E 00 4 22E 00 4 30E 00 0 2 78E 01 2 84E 01 2...

Page 65: ...33 7 31E 00 7 40E 00 7 50E 00 83 1 45E 00 1 49E 00 1 54E 00 34 7 04E 00 7 14E 00 7 23E 00 84 1 41E 00 1 45E 00 1 49E 00 35 6 79E 00 6 88E 00 6 98E 00 85 1 37E 00 1 41E 00 1 45E 00 36 6 54E 00 6 64E 00...

Page 66: ...nnector and check the continuity Start heating operation Replace four way valve S80 voltage at 180 280V with compressor on Four way valve coil resistance at Yes Yes Replace outdoor PCB Replace four wa...

Page 67: ...nce at a Yes Yes Replace outdoor PCB Replace four way valve coil No Four way valve coil Cooling Dry No continuity Heating Continuity Refer Figure 1 below No Fig 1 Voltage at S80 220 240 VAC Compressor...

Page 68: ...the power module as below i Disconnect compressor harness connector from outdoor PCB ii Follow table below to measure resistance between or power module terminal or diode bridge and the U V or W termi...

Page 69: ...0 V is applied 1 Set operation off and power off Disconnect the connector S70 2 Check that the voltage between the pins 4 7 is 320 VDC 3 Check that the control voltage between the pins 3 4 is 15 VDC 4...

Page 70: ...mperature The outdoor temperature should be within the operation range Is the airflow blocked by obstacles or winds blowing in the opposite direction No Change the installation location direction or r...

Page 71: ...ster positive terminal for digital tester Power transistor UVW Power transistor UVW Positive terminal of tester negative terminal for digital tester UVW Power transistor UVW Power transistor Normal re...

Page 72: ...waveform is a sine wave Fig 1 Check if there is waveform disturbance near the zero cross sections circled in Fig 2 Fig 1 Fig 2 R1726 R1444 6 11 Retrived parameter using D checker cable and software O...

Page 73: ...roduct manufactured in an ISO certified facility This document contains the most current information as of this orienting For the most up to date product information please go to www daikin oyl com my...

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