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Fujitsu ARXG45KHTA Service Manual

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AIR CONDITIONER
Duct type
INDOOR
OUTDOOR
SERVICE MANUAL
ARXG45KHTA
ARXG54KHTA
AOYG45KRTA
AOYG54KRTA
SR_AR015EF_07
2023.12.18

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  • Page 1 AIR CONDITIONER Duct type SERVICE MANUAL INDOOR ARXG45KHTA ARXG54KHTA OUTDOOR AOYG45KRTA AOYG54KRTA SR_AR015EF_07 2023.12.18...
  • Page 2 • Product specifications and design are subject to change without notice for future improvement. • For further details, please check with our authorized dealer. Trademarks ™ FGLair is trademark of Fujitsu General Limited in the United States, other countries or both. ™ Google Play is trademark of Google LLC. ®...
  • Page 3 CONTENTS 1. GENERAL INFORMATION 2. TECHNICAL DATA AND PARTS LIST 3. TROUBLESHOOTING 4. CONTROL AND FUNCTIONS 5. FILED WORKING...
  • Page 5 1. GENERAL INFORMATION 2021.05.21 SR_CH01_AR015EF_04...
  • Page 6 CONTENTS 1. GENERAL INFORMATION 1. Specifications....................01-1 1-1. Indoor unit ........................01-1 1-2. Outdoor unit........................01-2 2. Dimensions....................01-3 2-1. Indoor unit ........................01-3 2-2. Outdoor unit........................01-5...
  • Page 7 1. Specifications 1-1. Indoor unit Duct Type Inverter heat pump Model name ARXG45KHTA ARXG54KHTA Power supply 3N 400 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 342—457 V k→ 12.1 13.4 Rated Btu/h 41,300 45,700 Cooling k→...
  • Page 8 1-2. Outdoor unit Type Inverter heat pump Model name AOYG45KRTA AOYG54KRTA Power supply 3N 400 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 342—457 V Starting current Cooling 4,450 Airflow rate Heating 4,450 Type × Q'ty Propeller ×...
  • Page 9 2. Dimensions 2-1. Indoor unit ¢ Models: ARXG45KHTA and ARXG54KHTA Unit: mm Rear view Safety drain 1,080 port 1,000 (Bolt pitch) Drain port Main 12-Φ3 drain port P120 × 2 = 240 Side view (R) P5 × 120 = 600...
  • Page 10 ¢ Installation space requirement Provide sufficient installation space for product safety. NOTE: The detailed component shape depends on the model.  Models: ARXG45KHTA and ARXG54KHTA Installation by which maintenance space is mode on top of the unit (recommended). Unit: mm...
  • Page 11 2-2. Outdoor unit ¢ Models: AOYG45KRTA and AOYG54KRTA Unit: mm 35.7 Top view 3 Way valve (Liquid) 3 Way valve (Gas) 129.1 Pipe port Ф28 Ф28 85.3 Cable port Ф28: Cable port Pipe port Cable port Pipe port Pipe port Pipe port Front view Side view...
  • Page 12 - (01-6) - 2-2. Outdoor unit 2. Dimensions...
  • Page 13 2. TECHNICAL DATA AND PARTS LIST 2021.06.15 SR_CH02_AR015EF_04...
  • Page 14 CONTENTS 2. TECHNICAL DATA AND PARTS LIST 1. Precautions....................02-1 2. Indoor unit parts list..................02-2 2-1. Models: AR↓G45KHTA and AR↓G54KHTA..............02-2 3. Outdoor unit parts list.................02-4 3-1. Models: AOYG45KRTA and AOYG54KRTA ..............02-4 4. Accessories ....................02-8 4-1. Indoor unit ........................02-8 4-2. Outdoor unit........................02-8 5.
  • Page 15 • Service parts information and design are subject to change without notice for product improve- ment. • For the latest information of the service parts, refer to our Service Portal. https://fujitsu-general.force.com/portal/ • Precise figure of the service parts listed in this manual may differ from the actual service parts. - (02-1) -...
  • Page 16 2. Indoor unit parts list 2-1. Models: ARXG45KHTA and ARXG54KHTA ¢ Casing and fan Ref. Description Parts number Plate Top Sub Assy 9372576014 Kit (Panel Front Sub Assy) 9372637029 Panel Fan Assy 9372035009 Motor, Induct 9602802012 Casing A 9372057018 Casing B...
  • Page 17 ¢ Main PC board Ref. Description Parts number Power Supply PCB 9705668119 Main PCB (45) 9705246355 Main PCB (54) 9705246348 Transformer (Power) 9704129017 Terminal 3P 9703345012 Terminal 3P 9306489045 Relay 9900294014 Capacitor, Plastic 9900269111 - (02-3) - 2-1. Models: AR↓G45KHTA and AR↓G54KHTA 2.
  • Page 18 3. Outdoor unit parts list 3-1. Models: AOYG45KRTA and AOYG54KRTA ¢ Exterior parts and chassis - (02-4) - 3-1. Models: AOYG45KRTA and AOYG54KRTA 3. Outdoor unit parts list...
  • Page 19 Item no. Part no. Part name Service part 9383880001 Top panel assy ♦ 9381013005 Protective net ♦ 9375361013 Net rubber ♦ 9900984038 Thermistor (Heat exchanger) ♦ 9900727154 Thermistor assy ♦ 9383607004 Thermistor holder ♦ 9383874017 Right panel sub assy ♦ 9383879005 Pipe cover (Rear) ♦...
  • Page 20 ¢ Compressor - (02-6) - 3-1. Models: AOYG45KRTA and AOYG54KRTA 3. Outdoor unit parts list...
  • Page 21 Item no. Part no. Part name Service part 9383858017 Sound insulation unit ♦ 9900565091 Thermistor (Outdoor temp.) ♦ 9900186029 Pressure switch ♦ 9374425624 4-way valve assy ♦ 9970194016 Solenoid ♦ 9970158018 Sensor ♦ 9384848000 Accumulator assy ♦ 9970209000 Expansion valve coil ♦...
  • Page 22 4. Accessories 4-1. Indoor unit ¢ Models: ARXG45KHTA and ARXG54KHTA Part name Exterior Q’ty Part name Exterior Q’ty Coupler heat insulation Operation manual (small) Operating manual Special nut A (CD-ROM) (large flange) Special nut B Installation manual (small flange) Coupler heat insulation (large) 4-2.
  • Page 23 5. Optional parts 5-1. Indoor unit ¢ Controllers Exterior Part name Model name Summary Large and full-dot liquid crystal screen, wide and large keys easy to press, →ired Remote user-intuitive arrow key. UTY-RVNYM Controller →ire type: Polar 3-wire Room temperature can be controlled by detecting the temperature accurately with thermo sensor.
  • Page 24 Exterior Part name Model name Summary Remotely manage an air conditioning system using mobile devices such as smartphones and tablets. Appropriate application for each region is required to use this option. For details, contact FGL sales company. →LAN Adapter UTY-TFN↓Z1 The following service part is available for the attached wire replacement.
  • Page 25 6. Refrigerant system diagrams 6-1. Models: AOYG45KRTA and AOYG54KRTA Heat exchanger 3-Way 3-Way ( INDOOR ) valve valve Pressure switch Pressure sensor 4-Way valve Strainer Expansion valve Heat exchanger Strainer ( OUTDOOR ) : Cooling : Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Heat Exchanger Med temperature) : Thermistor (Outdoor temperature)
  • Page 26 7. Wiring diagrams 7-1. Indoor unit ¢ Models: ARXG45KHTA and ARXG54KHTA - (02-12) - 7-1. Indoor unit 7. →iring diagrams...
  • Page 27 7-2. Outdoor unit ¢ Models: AOYG45KRTA and AOYG54KRTA - (02-13) - 7-2. Outdoor unit 7. →iring diagrams...
  • Page 28 8. PC board diagrams 8-1. Models: ARXG45KHTA and ARXG54KHTA MAIN PCB 45 model: K03BZ-1801HSE-C1 54 model: K03BZ-1800HSE-C1 CN104 CN105 R15 - R17 B02B-XARK-1-A B04B-PASK-1 5V 12V 14V DC SUPPLY 10k <1/10W> x 3 WHITE JM103 UL1430 AWG22 UL1430 AWG26 GRAY...
  • Page 29 8-2. Models: AOYG45KRTA and AOYG54KRTA INVERTER ASSEMBLY 36 model : EZ-0190HUE 45 model : EZ-0193HUE 54 model : EZ-0191HUE DC340V UL1015 AWG20 GREEN UL1430 AWG22 DC FAN MOTOR 1 DC15V-2 TERMINAL EMI FILTER UL1430 AWG22 EMI FILTER BLACK BLACK F102 GRFC-8 P650 GRFC-8...
  • Page 30 - (02-16) - 8-2. Models: AOYG45KRTA and AOYG54KRTA 8. PC board diagrams...
  • Page 31 3. TROUBLESHOOTING 2023.08.24 SR_CH03_AR015EF_05...
  • Page 32 CONTENTS 3. TROUBLESHOOTING 1. Error code ....................03-1 1-1. How to check the error memory..................03-1 1-2. How to erase the error memory ..................03-1 1-3. Error code table (→ired remote controller)..............03-2 1-4. Error code table (Outdoor unit: for 45/54 model only).............03-3 2. Troubleshooting with error code ...............03-5 2-1.
  • Page 33 CONTENTS (continued) 3-3. No operation (Power is on) ...................03-45 3-4. No cooling/No heating ....................03-46 3-5. Abnormal noise......................03-48 3-6. →ater leaking........................03-49 4. Service parts information .................03-50 4-1. Compressor........................03-50 4-2. Inverter compressor......................03-51 4-3. Outdoor unit Electronic Expansion Valve (EEV) ............03-52 4-4. Indoor unit fan motor ....................03-54 4-5.
  • Page 35 1. Error code →hen a problem occurs in the system or the connected device, the error content is notified by dis- playing the code. NOTE: This function is only available in a system with indoor or IR receiver units equipped with in- dicator lamps to show the error content.

  • Page 36: Table Of Contents

    1-3. Error code table (Wired remote controller) The operation, timer, and economy indicators operate according to the error contents. For confirmation of the error contents, refer the flashing pattern as follows. Wired remote Error contents controller display E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit) E: 11.
  • Page 37 1-4. Error code table (Outdoor unit: for 45/54 model only) The operation status is determined by the lighting up and blinking of the LED lamp. After check that ERROR LED lamp blinks, press the ENTER button once. NOTE: For the positions of LED lamp and buttons, refer to "Function settings for outdoor unit"...
  • Page 38 PUMP LOW NOISE PEAK CUT POWER/ DOWN Error contents ERROR MODE E: 77. Heat sink thermistor error ■ ● ■ ■ ○ ○ ○ ● (Outdoor unit) E: 84. Current sensor error (Outdoor ■ ● ■ ■ ○ ○ ○ ●...

  • Page 39: E: 11. Serial Communication Error (Serial Reverse Transfer Error) (Outdoor Unit)

    2. Troubleshooting with error code 2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit) →ired remote Indicator Error code E: 11 controller Main PCB →hen the indoor unit cannot receive the serial signal from outdoor unit more than 2 minutes after power on, Detective actuator Outdoor unit or the indoor unit cannot receive the serial signal more...
  • Page 40 Check point 4. Check serial signal (Reverse transfer signal) Check serial signal (Reverse transfer signal) BLACK WHITE WHITE BLACK BLUE • Check if indicated value swings between AC 90 V and AC 270 V at the outdoor unit terminal 1 —3.

  • Page 41: E: 11. Serial Communication Error (Serial Forward Transfer Error) (Indoor Unit)

    2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit) →ired remote Indicator Error code E: 11 controller →hen the outdoor unit cannot receive the serial signal Detective actuator Indoor unit Main PCB from indoor unit more than 10 seconds. Connection failure Forecast of cause External cause...
  • Page 42 Check point 4. Check serial signal (Forward transfer signal) Check serial signal (Forward transfer signal) BLACK WHITE WHITE BLACK BLUE • Check if indicated value swings between AC 30 V and AC 130 V at outdoor unit terminal 2—3. • If it is abnormal, replace main PCB.

  • Page 43: E: 12. →Ired Remote Controller Communication Error (Indoor Unit)

    2-3. E: 12. Wired remote controller communication error (Indoor unit) →ired remote Indicator Error code E: 12 controller Indoor unit Main PCB →hen the indoor unit cannot receive the signal from wired remote controller more than following time during normal operation. Detective actuator →ired remote control •...

  • Page 44: E: 15. Automatic Air Flow Adjustment Error (Indoor Unit)

    2-4. E: 15. Automatic air flow adjustment error (Indoor unit) →ired remote Indicator Error code E: 15 controller • On automatic airflow adjustment operation, when the fan speed other than 0rpm is detected at the 0rpm operation. • On automatic airflow adjustment operation, when Detective actuator Indoor unit Main PCB...

  • Page 45: E: 18. External Communication Error (Indoor Unit)

    2-5. E: 18. External communication error (Indoor unit) →ired remote Indicator Error code E: 18 controller External After receiving a signal from the external input and Detective actuator Indoor unit communication output PCB, the same signal has not been received for error 15 seconds.

  • Page 46: E: 23. Combination Error (Outdoor Unit)

    2-6. E: 23. Combination error (Outdoor unit) →ired remote Indicator Error code E: 23 controller The outdoor unit receives the serial signal of applied Detective actuator Indoor unit refrigerant information from indoor unit. Forecast of cause Incorrect indoor unit is selected. Check point 1.

  • Page 47: E: 32. Indoor Unit Main Pcb Error (Indoor Unit)

    2-7. E: 32. Indoor unit main PCB error (Indoor unit) →ired remote Indicator Error code E: 32 controller →hen power is on and there is some below case. Detective actuator Indoor unit Main PCB 1. →hen model information of EEPROM is incorrect. 2.

  • Page 48: E: 33. Indoor Unit Motor Electricity Consumption Detection Error (Indoor Unit)

    2-8. E: 33. Indoor unit motor electricity consumption detection error (Indoor unit) →ired remote Indicator Error code E: 33 controller Indoor unit motor electricity →hen the voltage value or the current value of the motor Detective actuator consumption detection go beyond the limits Fan motor failure Forecast of cause Main PCB failure...

  • Page 49: E: 35. Manual Auto Button Error (Indoor Unit)

    2-9. E: 35. MANUAL AUTO button error (Indoor unit) →ired remote Indicator Error code E: 35 controller Indoor unit controller PCB →hen the MANUAL AUTO button becomes on for Detective actuator Indicator PCB consecutive 60 or more seconds. Manual auto switch MANUAL AUTO button failure Forecast of cause Controller PCB and indicator PCB failure...

  • Page 50: E: 39. Indoor Unit Power Supply Error For Fan Motor (Indoor Unit)

    2-10. E: 39. Indoor unit power supply error for fan motor (Indoor unit) →ired remote Indicator Error code E: 39 controller • →hen a momentary power cut off Detective actuator Indoor unit main PCB • →hen do not start fan motor External cause Forecast of cause Connector connection failure...
  • Page 51 2-11. E: 3A. Indoor unit communication circuit (wired remote controller) error →ired remote Indicator Error code E: 3A controller →ired remote controller (2-wire) Detect the communication error of microcomputer and Detective actuator communication PCB. Indoor unit controller PCB circuit Communication PCB defective Forecast of cause Indoor unit main PCB defective Check point 1.

  • Page 52: E: 41. Room Temperature Sensor Error (Indoor Unit)

    2-12. E: 41. Room temperature sensor error (Indoor unit) →ired remote Indicator Error code E: 41 controller Indoor unit main PCB Room temperature thermistor is open or short is Detective actuator detected always. Room temperature thermistor Connector failure Forecast of cause Thermistor failure Main PCB failure Check point 1.

  • Page 53: E: 42. Indoor Unit Heat Exchanger Sensor Error (Indoor Unit)

    2-13. E: 42. Indoor unit heat exchanger sensor error (Indoor unit) →ired remote Indicator Error code E: 42 controller Indoor unit main PCB →hen heat exchanger temperature thermistor open or Detective actuator Heat exchanger temperature short circuit is detected. thermistor Connector connection failure Forecast of cause Thermistor failure...

  • Page 54: E: 51. Indoor Unit Fan Motor Rotation Speed Error (Indoor Unit)

    2-14. E: 51. Indoor unit fan motor rotation speed error (Indoor unit) →ired remote Indicator Error code E: 51 controller Main PCB →hen the fan motor feed back rotation value which is detecting on the main PCB becomes 0 and lasts for more than 1 minute at motor operation condition.

  • Page 55: E: 53. Drain Pump Error (Indoor Unit)

    2-15. E: 53. Drain pump error (Indoor unit) →ired remote Indicator Error code E: 53 controller Indoor unit main PCB Detective actuator →hen Float switch is ON for more than 3 minutes. Float switch Float switch failure Shorted connector/wire failure Forecast of cause Main PCB failure Drain pump failure...

  • Page 56: E: 62. Outdoor Unit Main Pcb Error (Outdoor Unit)

    2-16. E: 62. Outdoor unit main PCB error (Outdoor unit) →ired remote Indicator Error code E: 62 controller Access to EEPROM failed due to some cause after Detective actuator Outdoor unit Main PCB outdoor unit started. External cause (Noise, temporary open, voltage drop) Forecast of cause Main PCB failure Check point 1.

  • Page 57: E: 63. Inverter Error (Outdoor Unit)

    2-17. E: 63. Inverter error (Outdoor unit) →ired remote Indicator Error code E: 63 controller Detective actuator Outdoor unit Inverter PCB Error information received from inverter PCB Forecast of cause External cause Power supply to inverter PCB wiring disconnection or open Inverter PCB failure Check point 1.

  • Page 58: E: 64. Pfc Circuit Error (Outdoor Unit)

    2-18. E: 64. PFC circuit error (Outdoor unit) →ired remote Indicator Error code E: 64 controller • →hen inverter input DC voltage is higher than 420 V for over 3 seconds, the compressor stops. Detective actuator Outdoor unit Main PCB •...

  • Page 59: E: 65. Trip Terminal L Error (Outdoor Unit)

    2-19. E: 65. Trip terminal L error (Outdoor unit) →ired remote Indicator Error code E: 65 controller →hen the signal from FO terminal of IPM is “L” (0 V) Detective actuator Outdoor unit Main PCB during the compressor stopping. Forecast of cause Main PCB failure Check point 1.

  • Page 60: E: 71. Discharge Thermistor Error (Outdoor Unit)

    2-20. E: 71. Discharge thermistor error (Outdoor unit) →ired remote Indicator Error code E: 71 controller Outdoor unit main PCB →hen discharge pipe temperature thermistor open or Detective actuator short circuit is detected at power on or while running the Discharge pipe temperature compressor thermistor...

  • Page 61: E: 72. Compressor Thermistor Error (Outdoor Unit)

    2-21. E: 72. Compressor thermistor error (Outdoor unit) →ired remote Indicator Error code E: 72 controller Outdoor unit main PCB →hen compressor temperature thermistor open or short Detective actuator circuit is detected at power on or while running the Compressor temperature thermistor compressor Connector failure Forecast of cause...

  • Page 62: E: 73. Heat Exchanger (Middle/Outlet) Temperature Thermistor Error (Outdoor Unit)

    2-22. E: 73. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor unit) →ired remote Indicator Error code E: 73 controller Heat exchanger liquid temperature • Heat exchanger liquid temperature thermistor short thermistor or open detected Detective actuator Heat exchanger middle • Heat exchanger middle temperature thermistor temperature thermistor short or open detected...

  • Page 63: E: 74. Outdoor Temperature Thermistor Error (Outdoor Unit)

    2-23. E: 74. Outdoor temperature thermistor error (Outdoor unit) →ired remote Indicator Error code E: 74 controller Outdoor unit main PCB →hen outdoor temperature thermistor open or short Detective actuator circuit is detected at power on or while running the Outdoor temperature thermistor compressor Connector failure...

  • Page 64: E: 77. Heat Sink Thermistor Error (Outdoor Unit)

    2-24. E: 77. Heat sink thermistor error (Outdoor unit) →ired remote Indicator Error code E: 77 controller Detective actuator Heat sink temperature thermistor Heat sink temperature thermistor short or open detected Connector failure Forecast of cause Thermistor failure Inverter PCB failure Check point 1.

  • Page 65: E: 84. Current Sensor Error (Outdoor Unit)

    2-25. E: 84. Current sensor error (Outdoor unit) →ired remote Indicator Error code E: 84 controller →hen input current sensor has detected 0 A, while inverter compressor is operating at higher than 50 rps, Detective actuator Outdoor unit Main PCB after 1 minute upon starting the compressor.

  • Page 66: E: 86. Pressure Sensor Error (Outdoor Unit)

    2-26. E: 86. Pressure sensor error (Outdoor unit) →ired remote Indicator Error code E: 86 controller Outdoor unit main PCB 30 seconds or more after power-on, when pressure sensor detection value detects the condition below Detective actuator continuously for 30 seconds or more. High pressure switch Ps ≤...

  • Page 67: E: 94. Trip Detection (Outdoor Unit)

    2-27. E: 94. Trip detection (Outdoor unit) →ired remote Indicator Error code E: 94 controller Inverter PCB Protection stop by over-current generation after inverter compressor start processing completed generated Main PCB consecutively 10 times. Detective actuator Outdoor unit NOTE: The number of generations is reset when the Compressor compressor starts up.

  • Page 68: E: 95. Compressor Motor Control Error (Outdoor Unit)

    2-28. E: 95. Compressor motor control error (Outdoor unit) →ired remote Indicator Error code E: 95 controller Main PCB "Protection stop by "overcurrent generation at inverter Detective actuator Outdoor unit compressor starting" restart" generated consecutively 10 Compressor times x 3 sets (total 30 times) Defective connection of electrical components Forecast of cause Main PCB failure...
  • Page 69 2-29. E: 97. Outdoor unit fan motor error (Outdoor unit) →ired remote Indicator Error code E: 97 controller Main PCB 1. →hen outdoor fan rotation speed is less than 100 rpm in 20 seconds after fan motor starts, fan motor stops.

  • Page 70: E: 99. 4-Way Valve Error (Outdoor Unit)

    2-30. E: 99. 4-way valve error (Outdoor unit) →ired remote Indicator Error code E: 99 controller Indoor unit main PCB →hen the indoor heat exchanger temperature is compared with the room temperature, and either Heat exchanger temperature following condition is detected continuously two times, thermistor the compressor stops.
  • Page 71 Check point 4. Check the solenoid coil and 4-way valve NOTE: Refer solenoid coil and 4-way valve in "Service parts information" on page 03-50. • Solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.97 kΩ. If it is open or abnormal resistance value, replace solenoid coil.
  • Page 72 2-31. E: A1. Discharge temperature error (Outdoor unit) →ired remote Indicator Error code E: A1 controller Outdoor unit main PCB Protection stop by discharge temperature ≥ 110 °C Detective actuator during compressor operation generated 2 times within Discharge temperature thermistor 24 hours.
  • Page 73 Check point 5. Check the refrigerant amount Check the refrigerant leakage. Check point 6. Replace the main PCB If check point 1 to 5 do not improve the symptom, replace the main PCB. - (03-39) - 2-31. E: A1. Discharge temperature error (Outdoor unit) 2.
  • Page 74 2-32. E: A3. Compressor temperature error (Outdoor unit) →ired remote Indicator Error code E: A3 controller Outdoor unit main PCB Protection stop by compressor temperature ≥ 108 °C Detective actuator during compressor operation generated 2 times within Compressor temperature thermistor 24 hours.
  • Page 75 Check point 5. Check the refrigerant amount Check the refrigerant leakage. Check point 6. Replace the main PCB If check point 1 to 5 do not improve the symptom, replace the main PCB. - (03-41) - 2-32. E: A3. Compressor temperature error (Outdoor unit) 2.
  • Page 76 2-33. E: AC. Heat sink temperature error (Outdoor unit) →ired remote Indicator Error code E: AC controller Outdoor unit inverter PCB Protection stop by heat sink temperature ≥ 80 °C during Detective actuator heat sink operation generated 2 times within 24 hours. Heat sink temperature thermistor Foreign matter on heat sink, heat sink dirty Foreign matter on heat exchanger, excessive ambient...
  • Page 77 3. Troubleshooting without error code 3-1. Indoor unit—No power Power supply failure Forecast of cause External cause Electrical components defective Check point 1. Check installation condition • Isn’t the breaker down? • Check loose or removed connection cable. -> If abnormal condition is found, correct it by referring to the installation manual or the “DESIGN & TECHNICAL MANUAL”.
  • Page 78 3-2. Outdoor unit—No power Power supply failure Forecast of cause External cause Electrical components defective Check point 1. Check installation condition • Is the circuit breaker on or off? • Check loose or removed connection cable. If abnormal condition is found, correct it by referring to the installation manual or the “DESIGN & TECHNICAL MANUAL”.
  • Page 79 3-3. No operation (Power is on) Setting/ Connection failure Forecast of cause External cause Electrical components defective Check point 1. Check indoor and outdoor installation condition • Indoor unit: – Check incorrect wiring between indoor unit and remote controller. – Check if there is an open cable connection.
  • Page 80 3-4. No cooling/No heating Indoor unit error Outdoor unit error Forecast of cause Effect by surrounding environment Connection pipe/Connection wire failure Refrigeration cycle failure Check point 1. Check Indoor unit • Does Indoor unit fan run in the HIGH mode? •...
  • Page 81 NOTES: • Strainer normally does not have temperature difference between inlet and outlet as shown be- low. Pipe (In) Pipe (Out) • If there is a difference like shown below, there is a possibility of inside clogged. In this case, re- place the strainer.
  • Page 82 3-5. Abnormal noise Abnormal installation (indoor unit/outdoor unit) Forecast of cause Fan failure (indoor unit/outdoor unit) Compressor failure (outdoor) Diagnosis method when abnormal noise is occurred Abnormal noise is coming from Outdoor Abnormal noise is coming from Indoor unit. unit. (Check and correct followings) (Check and correct followings) •...
  • Page 83 3-6. Water leaking Erroneous installation Forecast of cause Drain hose failure Diagnosis method when water is spitting Diagnosis method when water leak occurs • Is main unit installed in stable condi- tion? Is the filter clogged? • Is main unit broken or deformed at the time of transportation or maintenance? MPa MPa •...
  • Page 84 4. Service parts information 4-1. Compressor Diagnosis method of compressor (If outdoor unit LED displays error, refer to troubleshooting) Does not start up Stops soon after starting up Abnormal noise Check if vibration noise by Is there open or loose con- Is there open or loose con- loose bolt or contact noise of nection cable?
  • Page 85 4-2. Inverter compressor ¢ Models: AOYG45KRTA and AOYG54KRTA Check point 1. Check the terminal connection. • Check the following terminal connections of the compressor. (Loosening or incorrect wiring.) S (V) C (W) R (U): Red S (V): →hite Main PCB C (W): Black R (U) •...
  • Page 86 4-3. Outdoor unit Electronic Expansion Valve (EEV) ¢ Models: AOYG45KRTA and AOYG54KRTA Check point 1. Check connections Check connection of connector. (Loose connector or open cable) NOTE: For details of wiring diagram, refer to "→iring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-12.
  • Page 87 Check point 6. Check strainer • Strainer normally does not have temperature difference between inlet and outlet as shown be- low. Pipe (In) Pipe (Out) • If there is a difference like shown below, there is a possibility of inside clogged. In this case, replace the strainer.
  • Page 88 4-4. Indoor unit fan motor ¢ Models: ARXG45KHTA and ARXG54KHTA Check point 1. Check rotation of fan Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor) If fan or bearing is abnormal, replace it.
  • Page 89 4-5. Outdoor unit fan motor ¢ Models: AOYG45KRTA and AOYG54KRTA Check point 1. Check rotation of fan Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor) If fan or bearing is abnormal, replace it. Check point 2.
  • Page 90 4-6. Pressure switch ¢ Models: AOYG45KRTA and AOYG54KRTA • Type of contact Pressure • Characteristics of pressure switch Pressure switch 1 Contact: Short Open 4.2 — 4.05 MPa Contact: Open Short 3.2 ± 0.15 MPa 45/54 model: P770 - (03-56) - 4-6.
  • Page 91 4-7. 4-way valve coil (solenoid coil)/4-way valve ¢ Models: AOYG45KRTA and AOYG54KRTA Check point 1. Check connection • Check the connection of connector P60. BLACK SOLENOID COIL BLACK Check Point 2 : Check solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value ≈...
  • Page 92 5. Thermistor resistance values 5-1. Indoor unit ¢ Room temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -10.0 58.25 0.73 -5.0 44.03 0.93 33.62 1.15 25.93 1.39 10.0 20.18 1.66 15.0 15.84 1.94 20.0 12.54 2.22 25.0 10.00 2.50 30.0 8.04 2.77 35.0...
  • Page 93 5-2. Outdoor unit ¢ Heatsink thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 94.26 0.08 -25.0 67.95 0.11 -20.0 49.62 0.15 -15.0 36.68 0.20 -10.0 27.42 0.26 -5.0 20.73 0.34 15.83 0.43 12.21 0.55 10.0 9.50 0.68 15.0 7.46 0.84 20.0 5.90 1.01...
  • Page 94 ¢ Discharge temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 1,013.11 0.06 -25.0 729.09 0.09 -20.0 531.56 0.12 -15.0 392.31 0.16 -10.0 292.91 0.21 -5.0 221.09 0.28 168.60 0.36 129.84 0.46 10.0 100.91 0.57 15.0 79.12 0.71 20.0 62.55 0.86 25.0 49.84...
  • Page 95 ¢ Heat exchanger temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 95.58 0.24 -25.0 68.90 0.32 -20.0 50.31 0.43 -15.0 37.19 0.57 -10.0 27.81 0.73 -5.0 21.02 0.92 16.05 1.14 12.38 1.39 10.0 9.63 1.65 15.0 7.56 1.93 20.0 5.98 2.21 25.0...
  • Page 96 - (03-62) - 5-2. Outdoor unit 5. Thermistor resistance values...
  • Page 97 4. CONTROL AND FUNCTIONS 2021.05.21 SR_CH04_AR015EF_02...
  • Page 98 CONTENTS 4. CONTROL AND FUNCTIONS 1. Rotation number control of compressor...........04-1 1-1. Cooling operation ......................04-1 1-2. Heating operation ......................04-2 1-3. Dry operation ........................04-2 1-4. Rotation number of compressor at normal start-up ............04-3 1-5. Rotation number of compressor limitation by outdoor temperature ........04-4 2.

  • Page 99: Rotation Number Control Of Compressor

    1. Rotation number control of compressor 1-1. Cooling operation A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation rotation number of the compressor. •...

  • Page 100: Heating Operation

    1-2. Heating operation A sensor (room temperature thermistor) built in indoor unit body will usually perceive difference or variation between setting temperature and present room temperature, and controls operation rota- tion number of compressor. • If the room temperature is 3.0 °C lower than a set temperature, the operation rotation number of compressor will attain to maximum performance.

  • Page 101: Rotation Number Of Compressor At Normal Start-Up

    1-4. Rotation number of compressor at normal start-up ¢ Models: AOYG45KRTA and AOYG54KRTA Rotation number of compressor soon after starting is controlled as below. Rotation number X Rotation number IX Rotation number VIII Rotation number VII Rotation number VI Rotation number V Rotation number IV Rotation number III Rotation number II...

  • Page 102: Rotation Number Of Compressor Limitation By Outdoor Temperature

    1-5. Rotation number of compressor limitation by outdoor temperature The minimum rotation number of compressor is limited by outdoor temperature as below. • Cooling/Dry mode K zone 52°C J zone 50°C I zone 46°C H zone 31°C G zone 21°C F zone 13°C E zone...
  • Page 103 • Heating mode I zone 20°C H zone 16°C G zone 12°C F zone 7°C E zone 2°C D zone -7°C C zone -10°C B zone -15°C A zone Limitation of compressor Model name Outdoor temperature zone frequency A zone 46 rps B zone 42 rps...

  • Page 104: Auto Changeover Operation

    2. Auto changeover operation →hen the air conditioner is set to AUTO mode by remote controller, operation starts in the optimum mode from among heating, cooling, dry and monitoring modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set be- tween 18°C and 30°C in 1.0°C steps.
  • Page 105 Operation flow chart Start Ts: Setting temperarure Monitor mode Room temp. > Ts+2°C? Room temp. < Ts-2°C? Middle zone Auto change over is second or more? Operation mode before the monitor mode is cooling mode? Operation mode of Heating operation Cooling operation outdoor unit: Cooling? Thermostat remains...

  • Page 106: Fan Control

    3. Fan control Tr: Room temperature Ts: Setting temperature 3-1. Indoor fan control ¢ Fan operation Airflow can be switched in 4 steps such as AUTO, LO→, MED, HIGH while indoor unit fan only runs. →hen fan mode is set at AUTO, it operates on MED fan speed. ¢...
  • Page 107 ¢ Cool air prevention control (heating mode) The maximum value of the indoor fan speed is set as shown below, based on the detected tempera- ture by the indoor heat exchanger sensor on heating mode. • Normal operation Indoor heat exchanger temperature rises Setting fan mode 27°C...

  • Page 108: Outdoor Fan Control

    3-2. Outdoor fan control ¢ Outdoor fan motor This outdoor unit has a DC fan motor. (Control method is different between AC and DC motors.) ¢ Fan speed  Models: AOYG45KRTA and AOYG54KRTA Fan speed is defined by outdoor temperature and rotation number of compressor. Unit: rpm Fan step Cooling or dry...

  • Page 109: Timer Operation Control

    4. Timer operation control 4-1. Wireless remote control On/Off timer Program timer Sleep timer Weekly timer ○ ○ ○ — ¢ On/Off timer • Off timer: →hen the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 110 ¢ Sleep timer If the sleep timer is set, the room temperature is monitored and the operation is stopped auto- matically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time on. •...

  • Page 111: Ired Remote Control

    4-2. Wired remote control Temperature On/Off timer Program timer Sleep timer Weekly timer Setback Timer ○ ○ ○ ○ ○ ¢ On/Off timer • Off timer: →hen the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 112 ¢ Sleep timer If the sleep timer is set, the room temperature is monitored and the operation is stopped auto- matically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time on. •...
  • Page 113 ¢ Temperature Setback Timer • The temperature setback timer only changes the set temperature for 7 days, it cannot be used to start or stop air conditioner operation. • The temperature setback timer can be set to operate up to two times per day but only one temperature setting can be used.

  • Page 114: Defrost Operation Control

    5. Defrost operation control Tn: Outdoor unit heat exchanger temperature Ta: Outdoor temperature Tn10: Temperature at 10 minutes after compressor start Tnb: Temperature before 5 minutes Triggering condition • The defrost operation starts when outdoor unit heat exchanger temperature sensor detects the temperature lower than the values shown below.

  • Page 115: Defrost Operation In Heating Operation Stopped

    5-1. Defrost operation in heating operation stopped If the outdoor unit is frosted when stopping the heating operation, it stops after performing the auto- matic defrosting operation. In this time, if the indoor unit operation lamp flashes slowly (6 sec on/2 sec off), the outdoor unit al- low the heat exchanger to defrost, and then stop.

  • Page 116: Various Control

    6. Various control 6-1. Auto restart →hen the power was interrupted by a power failure etc. during operation, the operation contents at that time are memorized and when the power is recovered, operation is automatically started with the memorized operation contents. Operation contents memorized when the power is interrupted Operation mode Setting temperature...

  • Page 117: Compressor Preheating

    6-5. Compressor preheating By preheating the compressor, warm airflow is quickly discharged when the operation is started. • Triggering condition 1 – Outdoor temperature ≤ 20°C →hen outdoor temperature reaches 26°C, compressor preheating stops. – 30 minutes after compressor stopped •...

  • Page 118: Drain Pump Control

    6-8. Drain pump control ¢ Drain control for defrosting operation  During cooling or dry mode • →hen the compressor starts, the drain pump starts simultaneously. • The drain pump operates continuously for 3 minutes after the compressor is turned off. Compressor Drain pump 3 minutes...

  • Page 119: Prevention To Restart For 3 Minutes (3 Minutes St)

     During heating mode or fan mode and when operation is stopped • Triggering condition Drain pump is turned on at the same time that the float switch is turned on. • Operation details →hen the float switch turns on continuously for 3 minutes, "failure indication" operates. There- after, even if the float switch turns off, the "failure indication"...

  • Page 120: Outdoor Unit Low Noise Operation

    6-12. Outdoor unit low noise operation The compressor frequency and outdoor unit fan speed are limited to reduce the operation noise by external input. Compressor Outdoor fan speed frequency Low noise mode Low noise mode Cooling/Dry Level 1 AOYG45KRTA Heating Cooling/Dry AOYG54KRTA Level 2...

  • Page 121: Various Protections

    7. Various protections 7-1. Discharge gas temperature over-rise prevention control The discharge gas temperature sensor (discharge thermistor: outdoor unit side) detects the dis- charge gas temperature. • →hen the discharge temperature becomes higher than the trigger condition, the compressor fre- quency is decreased as the table below, and it continues to decrease until the discharge tempera- ture becomes lower than the trigger condition.

  • Page 122: Current Release Control

    7-3. Current release control The rotation number of compressor is controlled so that the outdoor unit input current does not ex- ceeds current limit value set according to the outdoor temperature. The rotation number of compressor returns according to the operation mode, when the current be- comes lower than the release value.

  • Page 123: High Temperature And High Pressure Release Control

    7-7. High temperature and high pressure release control The compressor is controlled as follows. ¢ Models: AOYG45KRTA and AOYG54KRTA • Cooling mode Indoor unit heat exchanger Indoor unit heat exchanger temperature rises temperature drops 64°C Zone A 60°C 58°C Zone B Zone C Stable zone Zone D...
  • Page 124 - (04-26) - 7-7. High temperature and high pressure release control 7. Various protections...
  • Page 125 5. FILED WORKING 2023.08.24 SR_CH05_AR015EF_04...
  • Page 126 CONTENTS 5. FILED WORKING 1. Function settings for indoor unit ...............05-1 1-1. Function settings on indoor unit..................05-1 1-2. Function settings by using remote controller ..............05-3 2. Function settings for outdoor unit.............05-6 2-1. Control PCB and switch buttons location................05-6 2-2. Local setting procedure ....................05-8 3.

  • Page 127: Function Settings For Indoor Unit

    1. Function settings for indoor unit To adjust the functions of this product according to the installation environment, various types of function settings are available. NOTE: Incorrect settings can cause a product malfunction. 1-1. Function settings on indoor unit By using some components on the PCB, you can change the function settings. Related components on the PCB and the applicable settings Component Setting content...
  • Page 128  Remote switch setting • Remote controller address setting (SW3) This switch can be used when group control system. Set the remote controller address in the 1,2,-,15 order. SW state Factory setting Single ♦ 1—15 Remote controller address  Jumper wire setting •...

  • Page 129: Function Settings By Using Remote Controller

    1-2. Function settings by using remote controller Some function settings can be changed on the remote controller. After confirming the setting proce- dure and the content of each function setting, select appropriate functions for your installation envi- ronment. ¢ Setting procedure by using remote controller Remote controller is not attached for this product.
  • Page 130 3) Room temperature sensor control for heating Depending on the installed environment, correction of the room temperature sensor may be re- quired. Select the appropriate control setting according to the installed environment. Function number Setting value Setting description Factory setting Standard ♦...
  • Page 131 7) Room temperature sensor switching (Aux.) To use the temperature sensor on the wired remote controller only, change the setting to "→ired re- mote controller" (01). This function will only work if the function setting 42 is set at "Both" (01). →hen the setting value is set to "Both"...

  • Page 132: Function Settings For Outdoor Unit

    2. Function settings for outdoor unit Perform appropriate function setting locally according to the installation environment. NOTE: Incorrect settings can cause a product malfunction. CAUTION • Before setting up the switch buttons, discharge the static electricity from your body. • Never touch the terminals or the patterns on the parts that are mounted on the PCB. 2-1.
  • Page 133 ¢ Switch buttons and the functions LED lamps S134 S133 S132 S131 S130 Switch buttons LED lamp Function or operation method Lights on while power on. (1) PO→ER/MODE Green Blinks to show the local setting on the outdoor unit or the error code. (2) ERROR Blinks during error operation.

  • Page 134: Local Setting Procedure

    2-2. Local setting procedure NOTE: Before performing the function setting, be sure to stop the operation of the air conditioner. ¢ Low noise mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of PO→ER/MODE blinks 9 times, press the ENTER switch but- ton (S132).
  • Page 135 ¢ Peak cut mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of PO→ER/MODE blinks 9 times, press the ENTER switch but- ton (S132). PUMP POWER LOW NOISE PEAK CUT DOWN...

  • Page 136: External Input And Output For Indoor Unit

    3. External input and output for indoor unit Connector Input Output Remarks CN114 Control input — CN115 — Operation status output See external input/output settings for details. CN14 — Fresh air control output CN15 — Auxiliary heater output 3-1. Preparation Before connecting the external input, preparation is necessary using the signal wire in the figure be- low.

  • Page 137: External Input

    3-2. External input • “Operation/Stop” mode or "Forced stop" mode can be selected with function setting of indoor unit. • A twisted pair cable (22A→G) should be used. Maximum length of cable is 150 m. • The wire connection should be separate from the power cable line. ¢...

  • Page 138: External Output

     Optional part Model name Exterior External input wire UTD-ECS5A 3-3. External output →ith using external output function, operating status of this product can be transmitted to the exter- nal device, and also, this product can be inter-connected with the external device. ¢...
  • Page 139 ¢ Fresh-air control output Signal linked to the indoor unit fan on can be output. NOTE: In cold-air prevention control operation, the signal becomes off.  Circuit diagram example Indoor unit Connected unit control PCB Example: Fan Example: 12 V Connector Relay unit Relay...
  • Page 140 ¢ Auxiliary heater output →hen indoor unit fan and compressor is turned on in heating operation, the signal is output from connector. Specifications of the signal output performance are as shown as follows: Example: →hen set temperature (Ts) is set at 22 °C; •...
  • Page 141  Optional part Model name Exterior Heater output wire UTD-ECS5A - (05-15) - 3-3. External output 3. External input and output for indoor unit...

  • Page 142: External Input And Output For Outdoor Unit

    4. External input and output for outdoor unit →ith using external input and output functions, this product can be operated inter-connectedly with an external device. Connector Input Output Remarks P580 Low noise mode — PA580 Peak cut mode — See external input/output settings for details.
  • Page 143 ¢ Peak cut mode By performing following on-site work, operation that suppresses the current value can be enabled: The air conditioner is set to the “Peak cut mode” when closing the contact input of a commercial timer or on/off switch to a connector on the control PCB of the outdoor unit. •...

  • Page 144: External Output

    4-2. External output →ith using external output function, some status signals are transmitted to the control PCB, and the related LED lamp indicates the status of this product. ¢ Error status output Signal on air conditioner error status is generated when a malfunction occurs. •...
  • Page 145 ¢ Compressor status output Signal on compressor operation status is generated when the compressor is running. • Circuit diagram example • Output voltage (Vcc): DC 12 Outdoor unit V 50 mA or less control PCB Connected unit (Locally purchased) • *: Make the distance from Example: Connector...

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