Daikin FTXA20A Service Manual Download Page 171

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Technical data

Service manual

171

FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05

5.2 Wiring diagram

5.2.1 Wiring diagram: Indoor unit

(1) Wiring diagram

English

Translation

Wiring diagram

Indoor unit

Outdoor unit

Wi-fi control circuit

Streamer unit

Streamer part

Earth plate

Wireless remote controller

(2) Notes

English

Translation

Connection

X1M

Main terminal

Field supply

PCB

Protective earth

Field wire

NOTES:

BLK : Black

YLW : Yellow

RED : Red

BLU : Blue

BRN : Brown

WHT : White

Caution

When the main power is turned off and then back on again, operation will resume
automatically.

(3) Legend

A*P

Printed circuit

BS*

Button switch

Capacitor

CN*, S, FG

Connector

Summary of Contents for FTXA20A

Page 1: ...Split Stylish R32 FTXA20A W S T FTXA20B B S T FTXA25A W S T FTXA25B B S T FTXA35A W S T FTXA35B B S T FTXA42A W S T FTXA42B B S T FTXA50A W S T FTXA50B B S T RXA42A RXA50A RXA20A 9 RXA25A 9 RXA35A 9...

Page 2: ...this publication to the best of its knowledge No express or implied warranty is given for the completeness accuracy reliability or fitness for particular purpose of its content and the products and se...

Page 3: ...IE18 03C See below February 2020 The following updates have been applied to the Service Manual Indoor unit models CTXA15B and FTXA20 50B added Outdoor unit fan motor Checking procedures updated Invert...

Page 4: ...n of high pressure switch 21 1 5 21 H6 00 Outdoor unit Malfunction of position detection sensor 22 1 5 22 H8 00 Outdoor unit Malfunction of compressor input system 23 1 5 23 H9 00 Outdoor unit Malfunc...

Page 5: ...20 35A2 class 42 50 units 115 2 14 Plate work 120 2 14 1 Outdoor unit 120 2 14 2 Indoor unit 126 2 15 Reactor 132 2 15 1 Checking procedures 132 2 15 2 Repair procedures 136 2 16 Streamer unit 137 2 1...

Page 6: ...oor unit 173 5 3 Piping diagram 176 5 3 1 Piping diagram Indoor unit 176 5 3 2 Piping diagram Outdoor unit 177 5 4 Component overview 180 5 4 1 Component overview Indoor unit 180 5 4 2 Component overv...

Page 7: ...error 1 3 To reset the error code via outdoor unit Prerequisite Problem is solved 1 Perform a power reset to reset the error code 1 4 To perform a test run Prerequisite Power supply MUST be in the spe...

Page 8: ...d to perform the checks in the listed order 1 Check for improper combination of the indoor unit and the outdoor unit See the combination table in the Databook for more information 2 Perform a check of...

Page 9: ...4165 Possible cause Airflow of the indoor unit is blocked 2 Clean the air filter of the indoor unit s See 4 Maintenance 4167 Possible cause Faulty or dirty air filter 3 Clean the indoor unit heat exch...

Page 10: ...er unit abnormality Trigger Effect Reset Streamer unit starts electric discharge when operation starts after approximately 90 to 180 seconds Unit will NOT stop operating Manual reset via user interfac...

Page 11: ...tic reset when resistance is within range To solve the error code INFORMATION It is recommended to perform the checks in the listed order 1 Perform a check of the indoor unit air room thermistor See 2...

Page 12: ...t thermal sensor INFORMATION If all procedures listed above have been performed and the problem is still present contact the helpdesk 1 5 9 E1 00 Outdoor unit PCB defect Trigger Effect Reset Main PCB...

Page 13: ...roblem is still present contact the helpdesk 1 5 10 E3 00 Outdoor unit Actuation of high pressure switch Trigger Effect Reset High pressure switch opens due to measured pressure above high pressure sw...

Page 14: ...for 60 seconds To solve the error code INFORMATION It is recommended to perform the checks in the listed order 1 Check that all stop valves of the refrigerant circuit are open See 3 2 Refrigerant circ...

Page 15: ...Perform a check of the discharge pipe thermistor See 2 19 Thermistors 4144 Possible cause Faulty discharge pipe thermistor or connector fault 2 Check that all stop valves of the refrigerant circuit a...

Page 16: ...nded to perform the checks in the listed order 1 Perform a check of the outdoor unit fan motor See 2 13 Outdoor unit fan motor 4111 Possible cause Faulty outdoor unit fan motor 2 Perform a check of th...

Page 17: ...ration for some time If the error occurs too soon unit will stop operating Manual reset via user interface To solve the error code INFORMATION It is recommended to perform the checks in the listed ord...

Page 18: ...perform the checks in the listed order 1 Check that all stop valves of the refrigerant circuit are open See 3 2 Refrigerant circuit 4158 Possible cause Closed stop valve in the refrigerant circuit 2 C...

Page 19: ...circuit 3 Perform a check of the heat exchanger thermistor See 2 19 Thermistors 4144 Possible cause Faulty heat exchanger thermistor 4 Perform a check of the expansion valve See 2 3 Expansion valve 45...

Page 20: ...or humidity in the refrigerant circuit See 3 2 Refrigerant circuit 4158 Possible cause Non condensables and or humidity in the refrigerant circuit 4 Check if the refrigerant circuit is clogged See 3 2...

Page 21: ...ink INFORMATION If all procedures listed above have been performed and the problem is still present contact the helpdesk 1 5 20 H3 00 Outdoor unit Malfunction of high pressure switch Trigger Effect Re...

Page 22: ...CB See 2 12 Main PCB 491 Possible cause Faulty main PCB 3 Check that all stop valves of the refrigerant circuit are open See 3 2 Refrigerant circuit 4158 Possible cause Closed stop valve in the refrig...

Page 23: ...ressor See 2 2 Compressor 446 Possible cause Faulty compressor or miswiring of the compressor power supply cable 3 Perform a check of the reactor See 2 15 Reactor 4132 Possible cause Faulty reactor IN...

Page 24: ...ted above have been performed and the problem is still present contact the helpdesk 1 5 25 J6 00 Outdoor unit Malfunction of heat exchanger thermistor Trigger Effect Reset Outdoor heat exchanger therm...

Page 25: ...er INFORMATION If all procedures listed above have been performed and the problem is still present contact the helpdesk 1 5 27 L4 00 Outdoor unit Malfunction of inverter radiating fin temperature rise...

Page 26: ...ode INFORMATION It is recommended to perform the checks in the listed order 1 Check that all stop valves of the refrigerant circuit are open See 3 2 Refrigerant circuit 4158 Possible cause Closed stop...

Page 27: ...resent contact the helpdesk 1 5 29 P4 00 Outdoor unit Malfunction of radiating fin temperature sensor Trigger Effect Reset Radiating fin thermistor input is out of range Unit will stop operating Manua...

Page 28: ...cable 7 Perform a check of the expansion valve See 2 3 Expansion valve 457 Possible cause Faulty expansion valve 8 Check for leaks in the refrigerant circuit Look for oil traces on the unit s Check th...

Page 29: ...ORMATION It is recommended to perform the checks in the listed order 1 Check if the power supply is conform with the regulations See 3 1 Electrical circuit 4156 Possible cause Faulty or disturbance of...

Page 30: ...unit and user interface Unit will stop operating Automatic reset To solve the error code INFORMATION It is recommended to perform the checks in the listed order 1 Check for improper combination of th...

Page 31: ...tions wiring between the outdoor unit and the indoor unit See 3 1 Electrical circuit 4156 Possible cause Faulty wiring between the outdoor unit and the indoor unit 3 Perform a check of the main PCB Se...

Page 32: ...ng operation cannot be used when the outdoor temperature is below 10 C DB When the operation lamp blinks there may be an error code activating the protection device Diagnose with remote controller ind...

Page 33: ...ield piping is defective is there a refrigerant leakage Is there capacity loss over the condensor saturation pressure or sound because of air mixed in to the circuit Incorrect size of connection wirin...

Page 34: ...where needed If the mounting wall is too thin you must use cushion material or rubber or change the installation place Refrigerant piping is too short is the length within specified range Due to bad i...

Page 35: ...ir enter the refrigerant system Conduct refrigerant collection and vacuum drying and then add proper amount refrigerant Is the refrigerant overcharged Conduct refrigerant collection and vacuum drying...

Page 36: ...or after the expansion valve capillary Check if there is a temperature difference before and after expansion valve capillary Check if the main valve unit of expansion valve operates by noise vibration...

Page 37: ...insulation of the electric system Check the thermistor Connection witch PCB Output Check PCB s HAP LED s if applicable if green led on the control PCB is not blinking then the microprocessor is not wo...

Page 38: ...er in the system Check the fan motor Check the magnetic switch Check the overcurrent relay Check the four way valve coil Is there a short circuit Is the four way valve coil broken Check the outdoor PC...

Page 39: ...kage or blockage of the humidification hose Is the length of the humidification hose correct within specified length Is setting correct for the humidification hose length Check the outdoor temperature...

Page 40: ...e energized Wait for it to cool down 2 Verify that the screw is firmly fixing the coil to the valve body 3 Check if any damage or burst is present Is the 4 way valve coil firmly fixed and not visually...

Page 41: ...Perform a position check of the 4 way valve see 2 1 1 Checking procedures 440 No Perform a check the main PCB see 2 12 Main PCB 491 When outdoor temperature does not allow the unit to run in cooling...

Page 42: ...orresponds with the flow shown in the flow diagram See 5 3 Piping diagram 4176 Is the flow correct Action Yes Skip the next step of this procedure No Perform the next step of this procedure 3 Connect...

Page 43: ...ration mode See 5 3 Piping diagram 4176 Is the flow correct Action Yes 4 way valve is OK Return to the troubleshooting of the specific error and continue with the next procedure No Perform the next st...

Page 44: ...it see 3 2 2 Repair procedures 4162 1 Remove the 4 way valve coil from the 4 way valve body see 2 1 2 Repair procedures 443 2 Remove and keep the putty if installed and the insulation if installed for...

Page 45: ...the 4 way valve body in the correct location and correctly oriented Insert the pipe ends in the pipe expansions 4 Supply nitrogen to the refrigerant circuit The nitrogen pressure MUST NOT exceed 0 02...

Page 46: ...w tie straps Is the problem solved Action Yes No further actions required No Return to the troubleshooting of the specific error and continue with the next procedure 2 2 Compressor 2 2 1 Checking proc...

Page 47: ...mpurities in the refrigerant A mechanical lock is present on the compressor Action Yes Replace the compressor see 2 2 2 Repair procedures 452 No Perform an mechanical check of the compressor see 2 2 1...

Page 48: ...erform an electrical check of the compressor 1 First perform a mechanical check of the compressor see 2 2 1 Checking procedures 446 DANGER RISK OF ELECTROCUTION Wait for at least 10 minutes after the...

Page 49: ...s NOT 0 this value MUST be substracted from the measured winding resistance 4 Measure the resistance between the compressor motor windings U V V W and U W Result All measurements MUST be approximately...

Page 50: ...of the appropriate PCB see 2 Components 440 12 Measure the current in each phase U V and W while compressor is operating All measurements MUST be the same Compressor motor winding current measurements...

Page 51: ...connectors from the compressor wire terminals U V and W INFORMATION Note the position of the Faston connectors on the compressor wire terminals to allow correct connection during installation V U W U...

Page 52: ...d plate work see 2 14 Plate work 4120 Prerequisite Remove the compressor insulation Prerequisite Recuperate the refrigerant from the refrigerant circuit see 3 2 2 Repair procedures 4162 1 If needed re...

Page 53: ...Heat the brazing points of the compressor pipes using an oxygen acetylene torch and remove the refrigerant pipes from the compressor pipes using pliers a a a Compressor pipe 6 Stop the nitrogen suppl...

Page 54: ...ssor see 2 2 2 Repair procedures 452 To install the compressor 1 Check the state of the dampers Replace if worn 2 Install the 3 dampers in the correct location on the unit 3 Remove the plugs or caps f...

Page 55: ...n pressure MUST NOT exceed 0 02 MPa 8 Wrap a wet rag around the compressor pipes and any other components near the compressor and solder the compressor pipes to the refrigerant pipes a a a Compressor...

Page 56: ...ompressor wire terminals a a Compressor wire terminals cover 12 Install the compressor insulation see 2 2 2 Repair procedures 452 13 Perform a pressure test see 3 2 1 Checking procedures 4158 14 Add r...

Page 57: ...air procedures 460 2 Remove the expansion valve coil from the expansion valve body see 2 3 2 Repair procedures 460 3 Slide the expansion valve magnet over the expansion valve body and gently rotate th...

Page 58: ...connecting a connector to the PCB make sure to connect it on the correct location and do NOT apply force as this may damage the connector or connector pins of the PCB Is the measured resistance correc...

Page 59: ...ence each expansion valve winding 1 2 3 4 is supplied with 12 V DC from the PCB You will need a good multimeter where its range is set to about 20 V DC and during opening or closing sequence you may b...

Page 60: ...te Turn OFF the respective circuit breaker Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 If needed remove any parts or insulation to create more space for the removal 2 Remove...

Page 61: ...e coil see 2 3 2 Repair procedures 460 To remove the expansion valve body Prerequisite Recuperate the refrigerant from the refrigerant circuit see 3 2 2 Repair procedures 4162 Prerequisite If needed r...

Page 62: ...h 8 Install plugs or caps on the open pipe ends of the refrigerant piping to avoid dirt or impurities from entering the piping 9 To install the expansion valve body see 2 3 2 Repair procedures 460 To...

Page 63: ...ion valve coil see 2 3 2 Repair procedures 460 10 Perform a pressure test see 3 2 1 Checking procedures 4158 11 Add refrigerant to the refrigerant circuit see 3 2 2 Repair procedures 4162 About the in...

Page 64: ...r or connector pins of the PCB 4 Fix the expansion valve coil harness using new tie straps 5 Install the insulation cap on the expansion valve coil if applicable Is the problem solved Action Yes No fu...

Page 65: ...ve coil harness using new tie straps 5 Install the insulation cap on the expansion valve coil if applicable Is the problem solved Action Yes No further actions required No Return to 2 3 1 Checking pro...

Page 66: ...h the next procedure No Replace the front panel motor see 2 4 2 Repair procedures 466 2 4 2 Repair procedures To remove the front panel motor Prerequisite Stop the unit operation via the user interfac...

Page 67: ...roblem solved Action Yes No further actions required No Return to the troubleshooting of the specific error and continue with the next procedure 2 5 High pressure switch 2 5 1 Checking procedures To p...

Page 68: ...re switch 6 Measure the resistance between the Faston connections of the high pressure switch Result The switch MUST be open INFORMATION If the high pressure switch was triggered open it will stay ope...

Page 69: ...near the high pressure switch Heat the brazing point of the high pressure switch pipe using an oxygen acetylene torch and remove the high pressure switch pipe from the refrigerant pipe using pliers a...

Page 70: ...stop the nitrogen supply after the component has cooled down 6 Connect the Faston connectors to the high pressure switch 7 Perform a pressure test see 3 2 1 Checking procedures 4158 8 Add refrigerant...

Page 71: ...on the connector S600 on the indoor unit main PCB Result The measured voltage MUST be 5 V DC Is the output voltage on the indoor unit main PCB correct Action Yes Replace the humidity sensor wiring ha...

Page 72: ...lly click the complete humidity sensor PCB assembly out of the indoor unit a a Humidity sensor PCB assembly 3 To install the humidity sensor PCB assembly see 2 6 2 Repair procedures 471 To install the...

Page 73: ...n normal Action Yes Perform an electrical check of the DC fan motor assembly see 2 7 1 Checking procedures 473 No Replace the DC fan motor assembly see 2 7 2 Repair procedures 473 To perform an electr...

Page 74: ...e of the fan motor cover for easier removal a a Indoor unit fan motor cover 3 Remove the rubber from the indoor unit 4 Remove the indoor unit fan motor from the indoor unit 5 To install the indoor uni...

Page 75: ...ure 2 8 Indoor unit main PCB 2 8 1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order To perform a power check of the indoor unit main PCB Prerequisite Stop th...

Page 76: ...ctor S102 Is the measured voltage on the indoor unit main PCB correct Action Yes Return to 2 8 1 Checking procedures 475 of the indoor unit main PCB and continue with the next procedure No Continue wi...

Page 77: ...he HAP LED on the indoor unit main PCB a a HAP LED INFORMATION Make sure the correct software is available on the PCB If NOT update using the updater tool Does the HAP LED blink in regular intervals 1...

Page 78: ...that no connectors or wires are damaged 3 Check that the wiring corresponds with the wiring diagram see 5 2 Wiring diagram 4171 INFORMATION Correct the wiring as needed Is the problem solved Action Ye...

Page 79: ...a b b a Indoor unit main PCB b PCB support 3 Remove the indoor unit main PCB from the indoor unit 4 To install the indoor unit main PCB see 2 8 2 Repair procedures 478 To install the indoor unit main...

Page 80: ...rs to the indoor unit main PCB INFORMATION Use the wiring diagram and connection diagram for correct installation of the connectors see 5 2 Wiring diagram 4171 WARNING When reconnecting a connector to...

Page 81: ...op the unit operation via the user interface Prerequisite Turn OFF the respective circuit breaker Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 Turn ON the power of the unit 2...

Page 82: ...ector S102 Result The measured voltage MUST be 324 VDC a a Connector S102 Is the measured voltage on the indoor unit power PCB correct Action Yes Return to 2 9 1 Checking procedures 481 of the indoor...

Page 83: ...e properly connected and that all connectors are fully plugged in 2 Check that no connectors or wires are damaged 3 Check that the wiring corresponds with the wiring diagram see 5 2 Wiring diagram 417...

Page 84: ...power PCB Prerequisite Stop the unit operation via the user interface Prerequisite Turn OFF the respective circuit breaker Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 Correc...

Page 85: ...05 a a Indoor unit power PCB 3 Remove the indoor unit power PCB from the indoor unit 4 To install the indoor unit power PCB see 2 9 2 Repair procedures 484 To install the indoor unit power PCB 1 Inst...

Page 86: ...ndoor unit power PCB INFORMATION Use the wiring diagram and connection diagram for correct installation of the connectors see 5 2 Wiring diagram 4171 WARNING When reconnecting a connector to the PCB m...

Page 87: ...unit operation via the user interface Prerequisite Turn OFF the respective circuit breaker Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 Remove the fuse from the PCB a a Fuse...

Page 88: ...he problem solved Action Yes No further actions required No Replace the intelligent thermal sensor see 2 10 2 Repair procedures 488 2 10 2 Repair procedures To remove the intelligent thermal sensor Pr...

Page 89: ...d No Return to the troubleshooting of the specific error and continue with the next procedure 2 11 Inverter PCB 2 11 1 Checking procedures As the inverter PCB is integrated in the main PCB of the unit...

Page 90: ...re that the Faston connectors are disconnected from the compressor wire terminals and connected to the Inverter Analyzer before starting the power transistor check operation If NOT power transistor ch...

Page 91: ...Return to the troubleshooting of the specific error and continue with the next procedure 2 11 2 Repair procedures As the inverter PCB is integrated in the main PCB of the unit see 2 12 Main PCB 491 fo...

Page 92: ...he next step 3 Check the power supply to the unit see 3 1 1 Checking procedures 4156 Does the unit receive power Action Yes Replace the main PCB see Repair procedures 498 No Adjust the power supply to...

Page 93: ...Is the correct spare part for the PCB installed Action Yes Return to Checking procedures 491 of the main PCB and continue with the next procedure No Replace the main PCB see Repair procedures 498 To...

Page 94: ...ing procedures 491 of the main PCB and continue with the next procedure To check the rectifier voltage of the main PCB Prerequisite First perform all earlier main PCB checks see Checking procedures 49...

Page 95: ...he diode module itself Prerequisite Stop the unit operation via the user interface 2 Turn OFF the respective circuit breaker DANGER RISK OF ELECTROCUTION Wait for at least 10 minutes after the circuit...

Page 96: ...10 minutes after the circuit breaker has been turned OFF to be sure the rectifier voltage is below 10 V DC before proceeding Power module IPM1 for compressor 1 Disconnect the compressor connector fro...

Page 97: ...ith the image and the table below d e c b a a U b V c W d DC e DC INFORMATION When measuring on the front of the main PCB make sure to locally remove the protective varnish with the test leads of the...

Page 98: ...Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 Disconnect the power supply wires from the main power supply terminal X1M and route the wires out of the ferrite core s d d d d d...

Page 99: ...the ground wiring on the switch box and fix using the screw 5 Route the power supply wiring through the ferrite core s and connect it to the main power supply terminal X1M 6 Route the wire through th...

Page 100: ...it breaker Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 Turn ON the power of the unit 2 Measure the voltage between the black and white wires Result The measured voltage MUST...

Page 101: ...Replace the main PCB see Repair procedures 4108 No Adjust the power supply to the unit see 3 1 2 Repair procedures 4157 To check the HAP LED of the main PCB Prerequisite First check the power supply t...

Page 102: ...r Is the correct spare part for the PCB installed Action Yes Return to Checking procedures 499 of the main PCB and continue with the next procedure No Replace the main PCB see Repair procedures 4108 T...

Page 103: ...0A unit a Fuse F1U b Fuse F2U c Fuse F3U c a b A A RXA42 50B unit a Fuse F1U b Fuse F2U c Fuse F3U Blown fuse on the main PCB Action Yes Replace the main PCB see Repair procedures 4108 No Return to Ch...

Page 104: ...age MUST be approximately 300 350 V DC a A b A RXA42 50A unit a terminal b terminal a b A A RXA42 50B unit a terminal b terminal INFORMATION When measuring on the front of the main PCB make sure to lo...

Page 105: ...fier voltage is NOT OK replace the main PCB Below procedure describes how to check the diode module itself Prerequisite Stop the unit operation via the user interface 2 Turn OFF the respective circuit...

Page 106: ...a 0 51 0 52 V a c O L 4 If the diode module is NOT OK replace the main PCB see Repair procedures 4108 To perform a power module check Prerequisite First check the rectifier voltage of the main PCB see...

Page 107: ...RXA42 50A unit a U b V c W d DC e DC a e d b c A A RXA42 50B unit a U b V c W d DC e DC INFORMATION When measuring on the front of the main PCB make sure to locally remove the protective varnish with...

Page 108: ...olved Action Yes No further actions required No Return to the troubleshooting of the specific error and continue with the next procedure Repair procedures To remove the main PCB Prerequisite Stop the...

Page 109: ...the switch box Route the ground wire out of the ferrite core 4 Disconnect the compressor connector 5 Cut the tie straps that fix the compressor harness to the switch box 6 Route the compressor harness...

Page 110: ...1M b Ferrite core power supply wires c Tie strap power supply wires d Screw ground wiring e Ferrite core ground wiring f Connector X12A g Compressor connector h Tie strap compressor harness i Ferrite...

Page 111: ...t is recommended to perform the checks in the listed order To perform a mechanical check of the propeller fan blade assembly Prerequisite Stop the unit operation via the user interface Prerequisite Tu...

Page 112: ...eating operation via the user interface 4 Check the functioning of the outdoor unit fan Outdoor unit fan Action Rotates continuously without interruption DC fan motor assembly is OK Return to the trou...

Page 113: ...Is the problem solved Action Yes No further actions required No Return to the troubleshooting of the specific error and continue with the next procedure Repair procedures To remove the propeller fan b...

Page 114: ...e DC fan motor assembly from the unit 9 To install the DC fan motor assembly see Repair procedures 4113 To install the DC fan motor assembly 1 Install the DC fan motor assembly in the correct location...

Page 115: ...r is correctly mounted on its base see Repair procedures 4118 2 Check the state of the propeller fan blade assembly for damage deformations and cracks Is the propeller fan blade assembly damaged Actio...

Page 116: ...ooting of the specific error and continue with the next procedure Does not rotate or rotates for a short time Continue with the next step INFORMATION The DC fan motor connector MUST be plugged into th...

Page 117: ...e on the DC fan motor connector S70 pins 2 4 rotation command on the PCB Result The measured voltage should be 0 7 V DC It should NOT be 0 V DC Is the measured voltage 0 V DC Action Yes Perform a chec...

Page 118: ...he propeller fan blade assembly from the DC fan motor assembly INFORMATION Use a pulley remover if the propeller cannot be removed manually 4 To install the propeller fan blade assembly see Repair pro...

Page 119: ...Attach the DC fan motor harness to the switch box 5 Install a new tie strap to fix the DC fan motor harness to the switch box 6 Connect the DC fan motor connector to the connector on the main PCB 7 L...

Page 120: ...or unit To remove the refrigerant connection cover DANGER RISK OF ELECTROCUTION DANGER RISK OF BURNING SCALDING 1 1 2 2 1 2 2 1 3 2 2 1 1 1 To remove the top plate INFORMATION This procedure is just a...

Page 121: ...plate 3 Remove the top plate To remove the front plate INFORMATION This procedure is just an example and may differ on some details for your actual unit Prerequisite Remove the top plate see 2 14 Plat...

Page 122: ...nd may differ on some details for your actual unit Prerequisite Stop the unit operation via the user interface Prerequisite Turn OFF the respective circuit breaker Prerequisite Remove the required pla...

Page 123: ...it Stylish R32 ESIE18 03D 2021 05 f a d c b e a Electrical power supply wiring b Wire terminals c Screws d Wire clamp e Screws f Right side plate assembly 4 Remove the screws that fix the wire clamp 5...

Page 124: ...emove the switch box from the outdoor unit 9 To install the switch box see 2 14 Plate work 4120 To install the switch box INFORMATION This procedure is just an example and may differ on some details f...

Page 125: ...y wiring to the wire terminals 4 Install the wire clamp and fix it using the screws 5 Connect all connectors to the main PCB INFORMATION Use the wiring diagram and connection diagram for correct insta...

Page 126: ...tie b Switch box 7 Install the insulation on the upper side of the switch box a b a Insulation b Main PCB 2 14 2 Indoor unit To open the front panel 1 Hold the front panel on both sides and open it O...

Page 127: ...n each side b Backside of the front panel c Fixing tab d Support INFORMATION If you CANNOT find the user interface or you use another optional controller Pull the front panel carefully up by hand as s...

Page 128: ...e service cover 1 Remove 1 screw from the service cover 2 Pull out the service cover horizontally away from the unit a b a Service cover screw b Service cover To remove the front grille CAUTION Wear a...

Page 129: ...le up and then towards the mounting plate to remove the front grille from the 3 hooks a a Hook Prerequisite If working space is limited 7 Insert a flat screwdriver next to the hooks 8 Pull the front g...

Page 130: ...he user interface Prerequisite Turn OFF the respective circuit breaker Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 Disconnect the power supply wiring from the power supply t...

Page 131: ...tighten the screw to secure the switch box 4 Install the heat exchanger thermistor in its holder 5 Connect the grounding wire to the heat exchanger using the screw 6 Install the grounding wire cover...

Page 132: ...0 DANGER RISK OF ELECTROCUTION Wait for at least 10 minutes after the circuit breaker has been turned OFF to be sure the rectifier voltage is below 10 V DC before proceeding 2 Visually check the react...

Page 133: ...next step No Replace the reactor see 2 15 2 Repair procedures 4136 4 Measure the inductance of the reactor using an LCR meter Result The inductance MUST be 80 100 H b d d b a c a L803 b L803 measurin...

Page 134: ...r L803 b Reactor L804 a b A A RXA42 50B unit a Reactor L803 b Reactor L804 2 Remove the main PCB see Repair procedures 4 108 The reactor measuring points are ONLY reachable on the back side of the mai...

Page 135: ...ring point e Measuring point d d c e a b c d c d e e e c A A RXA42 50B unit a L803 b L804 c Measuring point d Measuring point e Measuring point Is the resistance measurement correct Action Yes Proceed...

Page 136: ...asuring point d d c c a b c d c d A A RXA42 50B unit a L803 b L804 c Measuring point d Measuring point Is the inductance measurement correct Action Yes Return to the troubleshooting of the specific er...

Page 137: ...of the indoor unit main PCB is the problem solved Action Yes No further actions required No Replace the streamer unit see 2 16 2 Repair procedures 4137 2 16 2 Repair procedures To remove the streamer...

Page 138: ...turn to the troubleshooting of the specific error and continue with the next procedure 2 17 Swing flap motor 2 17 1 Main swing flap motor Checking procedures To perform an electrical check of the swin...

Page 139: ...swing flap motor see Repair procedures 4139 Repair procedures INFORMATION To replace the motor the complete gearcase assembly MUST be replaced To remove the swing flap motor gearcase assembly Prerequ...

Page 140: ...the main swing flap in the indoor unit by clicking it on Is the problem solved Action Yes No further actions required No Return to the troubleshooting of the specific error and continue with the next...

Page 141: ...he complete gearcase assembly MUST be replaced To remove the swing flap motor gearcase assembly Prerequisite Stop the unit operation via the user interface Prerequisite Turn OFF the respective circuit...

Page 142: ...7 Disconnect the harness from the swing flap motor 8 Disconnect the harness from the swing raster motor 9 To install the swing flap motor gearcase assembly see Repair procedures 4141 To install the s...

Page 143: ...t on Is the problem solved Action Yes No further actions required No Return to the troubleshooting of the specific error and continue with the next procedure 2 18 Swing raster motor 2 18 1 Checking pr...

Page 144: ...motor is integrated in the secondary swing flap motor gearcase assembly see 2 17 2 Secondary swing flap motor 4 140 for the repair procedures 2 19 Thermistors 2 19 1 Refrigerant side thermistors Check...

Page 145: ...edures 4144 2 Locate the thermistor INFORMATION Remove the thermistor from its holder if not reachable with a contact thermometer 3 Measure the temperature using a contact thermometer Name Symbol Loca...

Page 146: ...00 41 95 14 90 17 85 49 81 08 76 93 73 01 69 32 21 22 23 24 25 26 27 28 29 23 91 22 85 21 85 20 90 20 00 19 14 18 32 17 54 16 80 51 52 53 54 55 56 57 58 59 6 91 6 65 6 41 6 65 6 41 6 18 5 95 5 74 5 14...

Page 147: ...ce the applicable PCB INFORMATION See the overview of the thermistors at the start of the procedure and the 5 2 Wiring diagram 4171 to determine if the specific thermistor is either Directly connected...

Page 148: ...e humidity sensor PCB replace the humidity sensor assembly see 2 6 2 Repair procedures 471 Other refrigerant side thermistors Prerequisite Stop the unit operation via the user interface Prerequisite T...

Page 149: ...hermistors wired to the same connector Remove all other thermistors wired to the connector from their thermistor holder Disconnect the thermistor connector from the appropriate PCB Remove the complete...

Page 150: ...ATION Some of the thermistors are wired to the same connector See connector and pin information of the thermistors at the start of the electrical check procedure and 5 2 Wiring diagram 4171 ALWAYS rep...

Page 151: ...ectrical check of the fin thermistor Prerequisite Stop the unit operation via the user interface Prerequisite Turn OFF the respective circuit breaker Prerequisite Remove the required plate work see 2...

Page 152: ...istance between the appropriate connection points of the thermistor 5 Check that the measured resistance value matches the resistance determined through the measured temperature earlier step in the pr...

Page 153: ...re the power supply voltage between the pins 4 5 on the wifi control PCB connector Result The measured voltage MUST be 10 16 V DC a a Wifi control PCB assembly Is the measured power supply voltage cor...

Page 154: ...top the unit operation via the user interface Prerequisite Turn OFF the respective circuit breaker Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 Disconnect the connector from...

Page 155: ...S T FTXA20 50B B S T RXA42 50A RXA20 35A 9 RXA42 50B Split Stylish R32 ESIE18 03D 2021 05 Is the problem solved Action Yes No further actions required No Return to the troubleshooting of the specific...

Page 156: ...terminal X1M Result The voltage MUST be 230 V AC 10 5 Unbalance between the phases MUST NOT exceed 2 Is the measured voltage power supply correct Action Yes Return to the troubleshooting of the specif...

Page 157: ...roblem solved Action Yes No further actions required No Return to the troubleshooting of the specific error and continue with the next procedure 3 1 2 Repair procedures To adjust the power supply 1 Ma...

Page 158: ...ing of the specific error and continue with the next procedure 3 2 Refrigerant circuit 3 2 1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order To check if the...

Page 159: ...coil using a contact thermometer measure the temperature before and after every restricting device If a big temperature difference is measured 2 5 4K an internal pipe obstruction may be present at thi...

Page 160: ...pressure rises with lowering compressor output Operating frequency Low pressure High pressure Heating Proper amount Higher degree of overcharge Degree of overcharge To maintain high pressure frequenc...

Page 161: ...y decreasing Operating frequency comes to the lowest level Heating Frequency Low pressure High pressure Proper amount Higher degree of shortage Degree of refrigerant shortage To maintain low pressure...

Page 162: ...e 3 2 2 Repair procedures 4162 No Return to the troubleshooting of the specific error and continue with the next procedure To perform a pressure test of the refrigerant circuit 1 Perform a pressure te...

Page 163: ...air information 4164 for more details Is the problem solved Action Yes No further actions required No Return to the troubleshooting of the specific error and continue with the next procedure To recupe...

Page 164: ...ols according to the refrigerant and unit type R32 can be charged in gas phase Make sure to use a digital scale no charging cylinder Execute correct vacuum drying procedure after repair 0 1 MPa 760 mm...

Page 165: ...moved during repair Pipe expansion flare making Remove any burrs on the cut surface using the correct tool such as reamer or scraper note that excessive deburring can thin the pipe walls and cause cra...

Page 166: ...the specific error and continue with the next procedure No Wait for the outdoor temperature to return within the operating range To check for objects that may block the airflow 1 Check for the presenc...

Page 167: ...g a fin comb or compressed air N2 CAUTION Avoid bending or damaging the hair fins of the outdoor unit heat exchanger during the cleaning process Is the problem solved Action Yes No further actions req...

Page 168: ...t left Otherwise the corrosion of heat exchanger and drain pan may occur Pay attention to the cleaning agent that may also corrode other materials of the indoor unit Aluminium copper plastic ABS Is th...

Page 169: ...the air filters with a neutral detergent diluted in lukewarm water Dry the air filters in the shade Be sure to remove the titanium apatite deodorising and silver particle filters It is recommended to...

Page 170: ...mode 5 1 1 Detailed information setting mode Indoor unit See the installer reference guide on business portal for more information 5 1 2 Detailed information setting mode Outdoor unit See the installe...

Page 171: ...control circuit Wi fi control circuit Streamer unit Streamer unit Streamer part Streamer part Earth plate Earth plate Wireless remote controller Wireless remote controller 2 Notes English Translation...

Page 172: ...3D 2021 05 E1 Heat exchanger F1U Fuse H P Pilot lamp H1O Buzzer IES Motion detection sensor K1R Magnetic relay M1F Motor indoor fan M1S M2S M3S Motor swing flap M4S Motor front panel R1T R2T Thermisto...

Page 173: ...20 35 1 Wiring diagram English Translation Wiring diagram Wiring diagram Indoor Indoor Outdoor Outdoor Condenser Condenser Discharge Discharge 2 Notes English Translation Connection X1M Main terminal...

Page 174: ...rload protector R1T R2T R3T Thermistor S2 S90 Terminal connector SA1 Surge arrestor V2 V3 V150 Varistor X11A Connector X1M Terminal strip Y1E Electronic expansion valve Y1S Reversing solenoid valve co...

Page 175: ...E1 E2 HL1 HN1 S U V W Connector FU1 FU2 FU3 Fuse IPM Intelligent power module L Live M1C Compressor motor M1F Fan motor MR Magnetic relay N Neutral N 4 N 5 Number of passes PAM Pulse amplitude modulat...

Page 176: ...agrams shown in this manual may be incorrect due to changes updates to the unit Correct diagrams are supplied with the unit and can also be found in the technical data book a b c d R1T M1F 9 5 e e e f...

Page 177: ...9 5 mm flare connection M1F Fan c Stop valve liquid R1T Thermistor outdoor air d Stop valve with service port gas R2T Thermistor heat exchanger e Muffler with filter R3T Thermistor compressor dischar...

Page 178: ...F Fan c Stop valve liquid R1T Thermistor outdoor air d Stop valve gas R2T Thermistor heat exchanger e Muffler R3T Thermistor compressor discharge f Gas receiver S1PH High pressure switch g Filter Y1E...

Page 179: ...Fan c Stop valve liquid R1T Thermistor outdoor air d Stop valve gas R2T Thermistor heat exchanger e Muffler R3T Thermistor discharge pipe f Liquid receiver S1PH High pressure switch g Filter Y1E Elec...

Page 180: ...XA42 50B Split Stylish R32 ESIE18 03D 2021 05 5 4 Component overview 5 4 1 Component overview Indoor unit a c d b f e g h a Heat exchanger e Swing raster motor b Front panel motor f Secondary swing fl...

Page 181: ...RXA42 50A RXA20 35A 9 RXA42 50B Split Stylish R32 ESIE18 03D 2021 05 i j k l m n o p i Streamer unit m Humidity sensor PCB including room thermistor R2T j Indoor unit PCB n Intelligent thermal sensor...

Page 182: ...w Outdoor unit RXA20 35A i j k l m p o a b c d e f g h n a Air thermistor R1T i Main inverter PCB b Heat exchanger j Service PCB c Expansion valve k Muffler d Heat exchanger thermistor R2T l Discharge...

Page 183: ...a b c e f h i j d g d a Air thermistor R1T j 4 way valve coil b Heat exchanger k Main inverter PCB c Expansion valve l Service PCB d Muffler m High pressure switch e Heat exchanger thermistor R2T n Di...

Page 184: ...c f g j c e d c h i a Air thermistor R1T j 4 way valve coil b Heat exchanger k Main inverter PCB c Muffler l Terminal block d Heat exchanger thermistor R2T m High pressure switch e Liquid receiver n E...

Page 185: ...5 Technical data Service manual 185 FTXA20 50A W S T FTXA20 50B B S T RXA42 50A RXA20 35A 9 RXA42 50B Split Stylish R32 ESIE18 03D 2021 05 5 5 Field information report See next page...

Page 186: ...tion is required Please fill out the following form before contacting your distributor FIELD INFORMATION REPORT Key person information Name Company name Your contact details Phone number E mail addres...

Page 187: ...CB A1P Software version hydro PCB A5P Software version user interface Software version outdoor PCB Minimum water volume Maximum water volume Brine composition and mixture Brine freeze up temperature S...

Page 188: ...available service tools check the Daikin Business Portal authentication required 2 Go to the tab After sales support on the left navigation pane and select Technical support 3 Click the button Servic...

Page 189: ...rget set temperature in heating operation INFORMATION When there is a big difference between the indoor room temperature and the set temperature in heating mode adjust the target set temperature field...

Page 190: ...o switch OFF auto restart For example after a long power failure generators have to start up As there is limited energy and the air conditioners do NOT have priority it is recommended to switch OFF au...

Page 191: ...t breaker Prerequisite Remove the required plate work see 2 14 Plate work 4120 1 Cut the J5 jumper on the main PCB of the outdoor unit Field setting Sound level reduction To be used at Cut J5 jumper 1...

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Daikin FTXA20A, Service Manual

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