Fujitsu ABHG54KRTA Service Manual
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Fujitsu ABHG54KRTA Service Manual

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AIR CONDITIONER
Ceiling type
INDOOR
OUTDOOR
SERVICE MANUAL
ABHG54KRTA
AOHG54KRTA
SR_AB007EG_03
2020.11.16

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Summary of Contents for Fujitsu ABHG54KRTA

  • Page 1 AIR CONDITIONER Ceiling type SERVICE MANUAL INDOOR ABHG54KRTA OUTDOOR AOHG54KRTA SR_AB007EG_03 2020.11.16...
  • 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 Inc. ®...
  • 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 2020.04.16 SR_CH01_AB007EG_01...
  • 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 Ceiling Type Inverter heat pump Model name ABHG54KRTA Power supply 3N 400 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 342—457 V 13.4 Rated Btu/h 45,700 Cooling 4.5—14.5 Min.—Max. Btu/h 15,350—49,400 Capacity 15.5...
  • Page 8 1-2. Outdoor unit Type Inverter heat pump Model name AOHG54KRTA 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 × 1 Motor output Cooling Sound pressure level *1...
  • Page 9 2. Dimensions 2-1. Indoor unit ¢ Model: ABHG54KRTA Unit: mm 1,700 1,543 49 84 125 103 Side view Top view ø100-mm hole Rear view Suspension bolt pitch 1,543 Dimensions (Space required for installation) Indoor unit (Top view) The length of the bolt here is 30 mm.
  • Page 10 ¢ Installation space requirement Unit: mm Ceiling Indoor unit 30 or more Ceiling 200 or more 0 or more Obstruction Floor Required ceiling height varies according to the ceiling mode setting of function setting No. 20. Ceiling height (m) Ceiling mode Standard High ceiling 54 model...
  • Page 11 2-2. Outdoor unit ¢ Model: AOHG54KRTA 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 Rear view...
  • Page 12 - (01-6) - 2-2. Outdoor unit 2. Dimensions...
  • Page 13 2. TECHNICAL DATA AND PARTS LIST 2020.11.16 SR_CH02_AB007EG_02...
  • Page 14 CONTENTS 2. TECHNICAL DATA AND PARTS LIST 1. Precautions....................02-1 2. Indoor unit parts list..................02-2 2-1. Model: ABHG54KRTA ....................02-2 3. Outdoor unit parts list.................02-4 3-1. Model: AOHG54KRTA....................02-4 4. Accessories ....................02-8 4-1. Indoor unit ........................02-8 4-2. Outdoor unit........................02-8 5. Optional parts .....................02-9 5-1.
  • 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. Model: ABHG54KRTA ¢ Chassis - (02-2) - 2-1. Model: ABHG54KRTA 2. Indoor unit parts list...
  • Page 17 Side panel R sub assy ♦ 9900892029 Thermistor (Pipe) ♦ 9384287007 Evaporator total assy ♦ 9384364005 Drain pan total assy (4-fan) ♦ 9358746004 Drain cap ♦ 9384241009 Front panel (4-fan) assy ♦ - (02-3) - 2-1. Model: ABHG54KRTA 2. Indoor unit parts list...
  • Page 18 3. Outdoor unit parts list 3-1. Model: AOHG54KRTA ¢ Exterior parts and chassis - (02-4) - 3-1. Model: AOHG54KRTA 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 Thermo holder ♦ 9383874017 Right panel sub assy ♦ 9383879005 Rear pipe cover ♦...
  • Page 20 ¢ Compressor - (02-6) - 3-1. Model: AOHG54KRTA 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 (Service) ♦ 9970209000 Expansion valve coil ♦...
  • Page 22 4. Accessories 4-1. Indoor unit ¢ Model: ABHG54KRTA Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Insulation Operating manual Drain hose (CD-ROM) Installation manual Hose band Template Cable tie (large) M10 nut A Cable tie (small) (with flange)
  • Page 23 5. Optional parts 5-1. Indoor unit ¢ Controllers Exterior Part name Model name Summary Easy finger touch operation with LCD Wired remote panel. Backlit LCD enables easy UTY-RNRGZ* controller operation in a dark room. Wire type: Non-polar 2-wire High visibility and easy operation. Room temperature can be accurately Wired remote controlled using the built-in thermo...
  • Page 24 ¢ Others Exterior Part name Model name Summary Optional drain lift-up mechanism Drain pump unit UTR-DPB24T allows more flexible installation. For piping of upward direction only. Auxiliary pipe UTP-FX35A • For liquid: 9.52 mm (3/8 in) assembly • For gas: 15.88 mm (5/8 in) Use to connect with various peripheral External devices and air conditioner PCB.
  • Page 25 Exterior Part name Model name Summary Split system This converter is required when converter UTY-VTGXV connecting single split system to VRF (AC power network system. supply) Air conditioner switching can be External switch UTY-TERX controlled by connecting other external controller sensor switches.
  • Page 26 6. Refrigerant system diagrams 6-1. Model: AOHG54KRTA 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) : Thermistor (Heat Exchanger Out temperature)
  • Page 27 7. Wiring diagrams 7-1. Indoor unit ¢ Model: ABHG54KRTA - (02-13) - 7-1. Indoor unit 7. Wiring diagrams...
  • Page 28 7-2. Outdoor unit ¢ Model: AOHG54KRTA - (02-14) - 7-2. Outdoor unit 7. Wiring diagrams...
  • Page 29 8. PC board diagrams 8-1. Model: ABHG54KRTA CONTROL UNIT 54 MODEL : EZ-01914HSE EMI FILTER ZCAT1518-0730 CN8 Thermistor Characteristics. TERMINAL 2 TURNS DC12V Temperature REMOTE CONTROLLER ( 20 ( 30 UL1007 AWG22 14-1 Thermistor UL1007 AWG22 WHITE 14-2 2-WIRE TYPE ( OPTION ) 33.62 k...
  • Page 30 8-2. Model: AOHG54KRTA INVERTER ASSEMBLY 36 model: EZ-0190HUE 45 model: EZ-0191HUE 54 model: EZ-0191HUE DC340V UL1015 AWG20 GREEN UL1430 AWG22 DC FAN MOTOR 1 DC15V-2 TERMINAL EMI FILTER UL1430 AWG22 EMI FILTER F102 BLACK BLACK GRFC-8 P650 GRFC-8 UL1430 AWG22 WHITE WHITE 3 TURNS...
  • Page 31 3. TROUBLESHOOTING 2020.07.29 SR_CH03_AB007EG_01...
  • Page 32 CONTENTS 3. TROUBLESHOOTING 1. Error code ....................03-1 1-1. Error code table (Wired remote controller)..............03-1 1-2. Error code table (Outdoor unit) ..................03-2 2. Troubleshooting with error code ...............03-4 2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit).....03-4 2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit) ....03-6 2-3.
  • Page 33 CONTENTS (continued) 3-5. Abnormal noise......................03-47 3-6. Water leaking........................03-48 4. Service parts information .................03-49 4-1. Compressor........................03-49 4-2. Inverter compressor......................03-50 4-3. Outdoor unit Electronic Expansion Valve (EEV) ............03-51 4-4. Indoor unit fan motor ....................03-53 4-5. Outdoor unit fan motor....................03-54 4-6. Pressure switch ......................03-55 4-7.

  • Page 35: Table Of Contents

    1. Error code 1-1. 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.
  • Page 36 1-2. Error code table (Outdoor unit) 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 "Functionsettings (for outdoor unit)" in Chapter 5.
  • Page 37 PUMP LOW NOISE PEAK CUT POWER/ DOWN Error contents ERROR MODE E: 97. Outdoor unit fan motor error ■ ● ■ ■ ○ ○ ● ● (Outdoor unit) ■ ● ■ ■ ○ ○ ○ ● E: 99. 4-way valve error (Outdoor unit) E: A1.

  • Page 38: 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) Wired remote Indicator Error code E: 11 controller Main PCB When 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 39 Check point 4. Check serial signal (Reverse transfer signal) Check serial signal (Reverse transfer signal) BLACK WHITE BLACK WHITE • Check if indicated value swings between AC 90 V and AC 270 V at the outdoor unit terminal 1 —3. •...

  • Page 40: E: 11. Serial Communication Error (Serial Forward Transfer Error) (Indoor Unit)

    2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit) Wired remote Indicator Error code E: 11 controller When 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 41 Check point 4. Check serial signal (Forward transfer signal) Check serial signal (Forward transfer signal) BLACK WHITE BLACK WHITE • 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 42: E: 12. Wired Remote Controller Communication Error (Indoor Unit)

    2-3. E: 12. Wired remote controller communication error (Indoor unit) Wired remote Indicator Error code E: 12 controller Indoor unit Main PCB When the indoor unit cannot receive the signal from Detective actuator Wired remote controller more than 1 minute during Wired remote control normal operation.

  • Page 43: E: 15. Automatic Air Flow Adjustment Error (Indoor Unit)

    2-4. E: 15. Automatic air flow adjustment error (Indoor unit) Wired 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 44: E: 22. Indoor Unit Capacity Error (Indoor Unit)

    2-5. E: 22. Indoor unit capacity error (Indoor unit) When the total capacity of the indoor units does not Detective actuator Indoor unit main PCB match outdoor unit capacity while 3 minutes after power Indoor unit selection is incorrect. Forecast of cause Main PCB failure Check point 1.

  • Page 45: E: 23. Combination Error (Outdoor Unit)

    2-6. E: 23. Combination error (Outdoor unit) Wired remote Indicator Error code E: 23 controller Detective actuator Indoor unit • When the outdoor unit type is multi type Forecast of cause Incorrect indoor unit is selected. Check point 1. Check the type of indoor unit •...

  • Page 46: E: 32. Indoor Unit Main Pcb Error (Indoor Unit)

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

  • Page 47: E: 33. Indoor Unit Motor Electricity Consumption Detection Error (Indoor Unit)

    2-8. E: 33. Indoor unit motor electricity consumption detection error (Indoor unit) Wired remote Indicator Error code E: 33 controller Indoor unit motor electricity When 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 48: E: 35. Manual Auto Button Error (Indoor Unit)

    2-9. E: 35. MANUAL AUTO button error (Indoor unit) Wired remote Indicator Error code E: 35 controller Indoor unit controller PCB When 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 49: 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) Wired remote Indicator Error code E: 39 controller • When a momentary power cut off Detective actuator Indoor unit main PCB • When do not start fan motor External cause Forecast of cause Connector connection failure...

  • Page 50: E: 41. Room Temperature Sensor Error (Indoor Unit)

    2-11. E: 41. Room temperature sensor error (Indoor unit) Wired 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 51: E: 42. Indoor Unit Heat Exchanger Sensor Error (Indoor Unit)

    2-12. E: 42. Indoor unit heat exchanger sensor error (Indoor unit) Wired remote Indicator Error code E: 42 controller Indoor unit main PCB When 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 52: E: 51. Indoor Unit Fan Motor Error (Indoor Unit)

    2-13. E: 51. Indoor unit fan motor error (Indoor unit) Wired remote Indicator Error code E: 51 controller main PCB When the condition that actual frequency of indoor fan is Detective actuator Indoor unit below 1/3 of target frequency is continued more than 56 Fan motor seconds.

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

    2-14. E: 53. Drain pump error (Indoor unit) Wired remote Indicator Error code E: 53 controller Indoor unit main PCB Detective actuator When 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 54: E: 62. Outdoor Unit Main Pcb Error (Outdoor Unit)

    2-15. E: 62. Outdoor unit main PCB error (Outdoor unit) Wired 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 55: E: 63. Inverter Error (Outdoor Unit)

    2-16. E: 63. Inverter error (Outdoor unit) Wired 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 56: E: 64. Pfc Circuit Error (Outdoor Unit)

    2-17. E: 64. PFC circuit error (Outdoor unit) Wired remote Indicator Error code E: 64 controller • When inverter input DC voltage is higher than 420V for over 3 seconds, the compressor stops. Detective actuator Outdoor unit Main PCB • If the same operation is repeated 5 times, the compressor stops permanently.

  • Page 57: E: 65. Trip Terminal L Error (Outdoor Unit)

    2-18. E: 65. Trip terminal L error (Outdoor unit) Wired remote Indicator Error code E: 65 controller When 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 58: E: 71. Discharge Thermistor Error (Outdoor Unit)

    2-19. E: 71. Discharge thermistor error (Outdoor unit) Wired remote Indicator Error code E: 71 controller Outdoor unit main PCB When 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 59: E: 72. Compressor Thermistor Error (Outdoor Unit)

    2-20. E: 72. Compressor thermistor error (Outdoor unit) Wired remote Indicator Error code E: 72 controller Outdoor unit main PCB When 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 60: E: 73. Heat Exchanger (Middle/Outlet) Temperature Thermistor Error (Outdoor Unit)

    2-21. E: 73. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor unit) Wired 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 61: E: 74. Outdoor Temperature Thermistor Error (Outdoor Unit)

    2-22. E: 74. Outdoor temperature thermistor error (Outdoor unit) Wired remote Indicator Error code E: 74 controller Outdoor unit main PCB When 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 62: E: 77. Heat Sink Thermistor Error (Outdoor Unit)

    2-23. E: 77. Heat sink thermistor error (Outdoor unit) Wired 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 63: E: 84. Current Sensor Error (Outdoor Unit)

    2-24. E: 84. Current sensor error (Outdoor unit) Wired remote Indicator Error code E: 84 controller When 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 64: E: 86. High Pressure Switch Error (Outdoor Unit)

    2-25. E: 86. High pressure switch error (Outdoor unit) Wired remote Indicator Error code E: 86 controller Outdoor unit main PCB When pressure switch open is detected in 10 seconds Detective actuator after the power is turned on. High pressure switch High pressure switch connector disconnection or open Forecast of cause High pressure switch characteristics failure...
  • Page 65 2-26. E: 86. High pressure switch error (Outdoor unit) Wired 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 66: E: 94. Trip Detection (Outdoor Unit)

    2-27. E: 94. Trip detection (Outdoor unit) Wired 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 67: E: 95. Compressor Motor Control Error (Outdoor Unit)

    2-28. E: 95. Compressor motor control error (Outdoor unit) Wired 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 electric components Forecast of cause Main PCB failure...

  • Page 68: E: 97. Outdoor Unit Fan Motor Error (Outdoor Unit)

    2-29. E: 97. Outdoor unit fan motor error (Outdoor unit) Wired remote Indicator Error code E: 97 controller Main PCB 1. When outdoor fan rotation speed is less than 100 rpm in 20 seconds after fan motor starts, fan motor stops.

  • Page 69: E: 99. 4-Way Valve Error (Outdoor Unit)

    2-30. E: 99. 4-way valve error (Outdoor unit) Wired remote Indicator Error code E: 99 controller Indoor unit main PCB When 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 70 Check point 3. Check the solenoid coil and 4-way valve NOTE: Refer solenoid coil and 4-way valve in "Service parts information" on page 03-49. • Solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.97 kΩ. →...
  • Page 71 2-31. E: A1. Discharge temperature error (Outdoor unit) Wired 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 72 Check point 5. Check the refrigerant amount Check the refrigerant leakage. ↓ Check point 6. Replace main PCB If check point 1 to 5 do not improve the symptom, replace the main PCB. ↓ - (03-38) - 2-31. E: A1. Discharge temperature error (Outdoor unit) 2.
  • Page 73 2-32. E: A3. Compressor temperature error (Outdoor unit) Wired 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 74 Check point 5. Check the refrigerant amount Check the refrigerant leakage. ↓ Check point 6. Replace main PCB If check point 1 to 5 do not improve the symptom, replace the main PCB. ↓ - (03-40) - 2-32. E: A3. Compressor temperature error (Outdoor unit) 2.
  • Page 75 2-33. E: AC. Heat sink temperature error (Outdoor unit) Wired 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 76 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 77 3-2. Outdoor 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 3-3. 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 79 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 80 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 81 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 Indoor unit. Abnormal noise is coming from Indoor unit. (Check and correct followings) (Check and correct followings) ↓...
  • Page 82 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? ↓...
  • Page 83 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 84 4-2. Inverter compressor ¢ Model: AOHG54KRTA Check point 1. Check connection • Check terminal connection of compressor (loose or incorrect wiring) T(W) S(V) (BLACK) (WHITE) Main PCB R(U) (RED) • Check terminal connection of main PCB (loose or incorrect wiring) Main PCB W400(U) W401(V) W402(W)
  • Page 85 4-3. Outdoor unit Electronic Expansion Valve (EEV) ¢ Model: AOHG54KRTA Check point 1. Check connections Check connection of connector. (Loose connector or open cable) NOTE: For details of wiring diagram, refer to "Wiring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-13. Check point 2.
  • Page 86 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 87 4-4. Indoor unit fan motor ¢ Model: ABHG54KRTA 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 88 4-5. Outdoor unit fan motor ¢ Model: AOHG54KRTA 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 89 4-6. Pressure switch ¢ Model: AOHG54KRTA • 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 54 model: P770 - (03-55) - 4-6.
  • Page 90 4-7. 4-way valve coil (solenoid coil)/4-way valve ¢ Model: AOHG54KRTA 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 91 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 92 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 93 ¢ 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 94 ¢ 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 95 4. CONTROL AND FUNCTIONS 2020.07.29 SR_CH04_AB007EG_01...
  • Page 96 CONTENTS 4. CONTROL AND FUNCTIONS 1. Compressor frequency control..............04-1 1-1. Cooling operation ......................04-1 1-2. Heating operation ......................04-2 1-3. Dry operation ........................04-2 1-4. Compressor frequency at normal start-up ..............04-3 1-5. Compressor frequency limitation by outdoor temperature ..........04-4 2. Auto changeover operation................04-6 3.
  • Page 97 CONTENTS (continued) 8-8. High temperature and high pressure release control ............04-29...

  • Page 99: Compressor Frequency Control

    • Compressor frequency range Model name Minimum frequency Maximum frequency ABHG54KRTA 17 rps 95 rps • Limit of maximum speed based on outdoor temperature Outdoor temperature rises...

  • Page 100: Heating Operation

    Unit: rps Model name Minimum frequency Maximum frequency ABHG54KRTA 1-3. Dry operation The compressor rotation frequency shall change according to the temperature, set temperature, and room temperature variation which the room temperature sensor of the indoor unit has detected as shown in the table below.

  • Page 101: Compressor Frequency At Normal Start-Up

    1-4. Compressor frequency at normal start-up ¢ Model: AOHG54KRTA Compressor frequency soon after starting is controlled as below. Frequency X Frequency IX Frequency VIII Frequency VII Frequency VI Frequency V Frequency IV Frequency III Frequency II Frequency I Time 1 Time 2 Time 3 Time 4...

  • Page 102: Compressor Frequency Limitation By Outdoor Temperature

    1-5. Compressor frequency limitation by outdoor temperature The minimum compressor frequency 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 7°C D zone °C...
  • 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 When 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 speed Indoor fan speed is defined as below. Speed (rpm) Operation mode Fan mode ABHG54KRTA HIGH 1,240 MED+ 1,140 1,030 Heating LOW- QUIET Cool air prevention...
  • Page 107 ¢ Dry operation During dry operation, fan speed setting can not be changed as shown in “Fan speed” above. ¢ Heating operation Switch the airflow AUTO, and the indoor fan motor will run according to a room temperature, as be- low.
  • Page 108 • 10 °C HEAT operation Indoor heat exchanger Indoor heat exchanger temperature rises temperature drops AUTO 39°C 34°C ¢ Moisture return prevention control (cooling and dry mode) Switch the airflow AUTO at cooling mode, and the indoor fan motor will run as shown below. Compressor Indoor fan setting airflow...

  • Page 109: 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  Model: AOHG54KRTA Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry...

  • Page 110: Louver Control

    4. Louver control 4-1. Vertical airflow direction louver control Each time the button is pressed, the air direction range will change as below: • Remote controller display is not changed. • Vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

  • Page 111: Timer Operation Control

    5. Timer operation control 5-1. Wireless remote control On/Off timer Program timer Sleep timer Weekly timer ○ ○ ○ — ¢ On/Off timer • Off timer: When 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: Wired Remote Control

    5-2. Wired remote control Temperature set On/Off timer Program timer Sleep timer Weekly timer back timer ○ ○ ○ ○ ○ ¢ On/Off timer • Off timer: When the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 114 ¢ 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 115 ¢ Temperature set back timer • The SET BACK timer only changes the set temperature for 7 days, it cannot be used to start or stop air conditioner operation. • The SET BACK timer can be set to operate up to two times per day but only one temperature setting can be used.

  • Page 116: Defrost Operation Control

    6. 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 117: Defrost Operation In Heating Operation Stopped

    6-1. 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 118: Various Control

    7. Various control 7-1. Auto restart When 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 119: Fresh Air Control

    7-5. Fresh air control The fan motor for Fresh Air is operated in synchronization with the indoor fan operation as below. Operation Fan motor (Indoor unit) Stop Operation Fan motor (for Fresh Air) Stop 7-6. Compressor preheating By preheating the compressor, warm airflow is quickly discharged when the operation is started. •...

  • Page 120: Electronic Expansion Valve Control

    7-8. Electronic expansion valve control The most proper opening of the electronic expansion valve is calculated and controlled under the present operating condition based on the table below. Operation mode Pulse range Cooling/dry mode Between 47 and 480 pulses Heating mode Between 39 and 480 pulses NOTE: At the time of supplying the power to the outdoor unit, the initialization of the electronic ex- pansion valve is operated (528 pulses are input to the closing direction).

  • Page 121: Drain Pump Control

    7-9. Drain pump control ¢ Drain control for cooling operation  During the compressor in operation • Triggering condition The thermostat is turned on during cooling or dry mode. • Operation details The drain pump is turned on. • Release condition –...
  • Page 122  Overflow control • Triggering condition The float switch is turned on. • Operation details – The drain pump is turned on. – When the operation mode is cooling or dry, operate the followings. • The compressor is stopped. • Then indoor fan control is turned off. •...

  • Page 123: Prevention To Restart For 3 Minutes (3 Minutes St)

    7-10. Prevention to restart for 3 minutes (3 minutes st) When the compressor fails to start for the number of times below, it does not enter operation status for 3 minutes. Retry number Retry set number When the compressor fails to start in the retry set number above, the compressor is stopped. 7-11.

  • Page 124: Various Protections

    8. Various protections 8-1. Discharge gas temperature over-rise prevention control The discharge gas temperature sensor (discharge thermistor: outdoor unit side) detects the dis- charge gas temperature. • When 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 125: Current Release Control

    8-3. Current release control The compressor frequency is controlled so that the outdoor unit input current does not exceeds cur- rent limit value set according to the outdoor temperature. The compressor frequency returns according to the operation mode, when the current becomes low- er than the release value.

  • Page 126: High Pressure Protection

    8-6. High pressure protection Pressure switch: Off (Open: Higher than 4.2 MPa) Trigger condition Compressor stop Pressure switch: On (Close: Lower than 3.2 MPa) Release condition (3 minutes after compressor stop) Compressor restart 8-7. Low outdoor temperature protection When the outdoor temperature sensor detects lower than the trigger condition below, the compres- sor is stopped.
  • Page 127 8-8. High temperature and high pressure release control The compressor is controlled as follows. ¢ Model: AOHG54KRTA • 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 Zone...
  • Page 128 - (04-30) - 8-8. High temperature and high pressure release control 8. Various protections...
  • Page 129 5. FILED WORKING 2020.07.29 SR_CH05_AB007EG_01...
  • Page 130 CONTENTS 5. FILED WORKING 1. Function settings for indoor unit ...............05-1 1-1. Function settings by using remote controller ..............05-1 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. External input and output for indoor unit ..........05-10 3-1.

  • Page 131: 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 by using remote controller Some function settings can be changed on the remote controller.
  • Page 132 2) Ceiling height Select the appropriate ceiling height according to the place of installation. Function number Setting value Setting description Factory setting Standard ♦ High ceiling For the specific height for each setting value, refer to “Installation space” in Chapter "Dimensions" on page 1.
  • Page 133 5) Room temperature control for wired remote controller sensor Depending on the installed environment, correction of the wire remote temperature sensor may be required. Select the appropriate control setting according to the installed environment. To change this setting, set Function 42 to Both “01”. Ensure that the Thermo Sensor icon is displayed on the remote controller screen.
  • Page 134 8) Remote controller custom code (Only for wireless remote controller) The indoor unit custom code can be changed. Select the appropriate custom code. Function number Setting value Setting description Factory setting ♦ 9) External input control "Operation/Stop" mode or "Forced stop" mode can be selected. Function number Setting value Setting description...
  • Page 135 12) Switching functions for external output terminal Functions of the external output terminal can be switched. For details, refer to “External input and output”. Function number Setting value Setting description Factory setting Operation status ♦ 01—08 (Setting prohibited) Error status Indoor unit fan operation status External heater - (05-5) -...

  • Page 136: 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 137 ¢ 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) POWER/MODE Green Local setting in outdoor unit or error code is displayed with blink. (2) ERROR Blinks during error operation.

  • Page 138: 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 POWER/MODE blinks 9 times, press the ENTER switch but- ton (S132).
  • Page 139 ¢ 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 POWER/MODE blinks 9 times, press the ENTER switch but- ton (S132). PUMP POWER LOW NOISE PEAK CUT DOWN...

  • Page 140: External Input And Output For Indoor Unit

    3. External input and output for indoor unit Rotary switch CN65 CN47 (Ext.in/out PCB) (Ext.out) Terminal (Ext.in) Fig. Indoor unit PCB Fig. External input and output PCB External Input connect kit External input External output Connector Input select signal (Optional parts) Operation/Stop —...
  • Page 141 ¢ External input and output PCB The indoor unit Operation/Stop can be set by using the input terminal on the PCB.  Input select Use either one of these types of terminals according to the application. (Both types of terminals cannot be used simultaneously.) •...

  • Page 142: External Output

    3-2. External output Use an external output cable with appropriate external dimension, depending on the number of ca- bles to be installed. ¢ Indoor unit • A twisted pair cable (22AWG) should be used. Maximum length of cable is 25 m. •...

  • Page 143: Combination Of External Input And Output

    3-3. Combination of external input and output By combining the function setting of the indoor unit and rotary switch setting of the External input and output PCB, you can select various combinations of functions. Combination examples of external input and output are as follows: External input External input Function...
  • Page 144 ¢ Input signal type • Indoor unit Input signal type is only "Edge". Edge • External input and output PCB The input signal type can be selected. Signal type (edge or pulse) can be switched by the DIP switch 2 (SW2) on the External input and output PCB.

  • Page 145: Details Of Function

    3-4. Details of function ¢ Control input function  When function setting is "Operation/Stop" mode 1 • In the case of "Edge" input Rotary SW of Function External input and External input Input signal Command setting / output PCB Off → On Operation Input of indoor unit Terminal...
  • Page 146  When function setting is "Forced stop" mode • In the case of "Edge" input Rotary SW of Function External input and External input Input signal Command setting / output PCB Off → On Forced stop Input of indoor unit Terminal On →...
  • Page 147  When function setting is "Operation/Stop" mode 2 • In the case of "Edge" input Rotary SW of Function External input and External input Input signal Command setting / output PCB Off → On Operation Input of indoor unit Terminal Stop (R.C.
  • Page 148 ¢ Forced thermostat off function Function Rotary SW of External External input Input signal Command setting / input and output PCB 60-00 / 2 Off → On Thermostat off 60-09 / B External input and output Input 1 60-10 / C Normal On →...
  • Page 149 ¢ Error status Function Rotary SW of External External output Output signal Command setting / input and output PCB Low → High Error 60-09 / B Output of indoor unit CN47 High → Low Normal Off → On Error 60-00 / 2 Output 1 On →...
  • Page 150 ¢ External heater output Function Rotary SW of External External output Output signal Command setting / input and output PCB Low → High Heater on 60-11 / D Output of indoor unit CN47 High → Low Heater off 60-00 / 2 Off →...

  • Page 151: External Input And Output For Outdoor Unit

    4. External input and output for outdoor unit With 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 152 ¢ 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 153: External Output

    4-2. External output With 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 154 ¢ 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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