Fujitsu General ARXG45KHTB Service Manual
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Fujitsu General ARXG45KHTB Service Manual

Fujitsu General ARXG45KHTB Service Manual

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AIR CONDITIONER
Duct type
INDOOR
OUTDOOR
SERVICE MANUAL
ARXG45KHTB
ARXG54KHTB
AOHG45KRTA
AOHG54KRTA
SR_AR040EG_03
2022.04.07
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Summary of Contents for Fujitsu General ARXG45KHTB

  • Page 1 AIR CONDITIONER Duct type SERVICE MANUAL INDOOR ARXG45KHTB ARXG54KHTB OUTDOOR AOHG45KRTA AOHG54KRTA SR_AR040EG_03 2022.04.07...
  • 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 2022.01.24 SR_CH01_AR040EG_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 Duct Type Inverter heat pump Model name ARXG45KHTB ARXG54KHTB Power supply 3N 400 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 342—457 V 12.1 13.4 Rated Btu/h 41,300 45,700 Cooling 4.0—14.0 5.0—14.5 Min.—Max.
  • Page 8 1-2. Outdoor unit Type Inverter heat pump Model name AOHG45KRTA 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 ×...
  • Page 9 2. Dimensions 2-1. Indoor unit ¢ Models: ARXG45KHTB and ARXG54KHTB Unit: mm Rear view 1,080 1,000 Drain port 12-Φ3 P120 × 2 = 240 Side view (R) P5 × 120 = 600 Side view (L) 1,050 Top view Front view - (01-3) - 2-1.
  • Page 10 ¢ Installation space requirement Provide sufficient installation space for product safety. NOTE: The detailed component shape depends on the model.  Models: ARXG45KHTB and ARXG54KHTB Installation by which service space is mode on top of the unit (recommended). Unit: mm 350 or more 450 or more...
  • Page 11 2-2. Outdoor unit ¢ Models: AOHG45KRTA and 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...
  • Page 12 - (01-6) - 2-2. Outdoor unit 2. Dimensions...
  • Page 13 2. TECHNICAL DATA AND PARTS LIST 2022.04.07 SR_CH02_AR040EG_02...
  • Page 14 CONTENTS 2. TECHNICAL DATA AND PARTS LIST 1. Precautions....................02-1 2. Indoor unit parts list..................02-2 2-1. Models: ARXG45KHTB and ARXG54KHTB..............02-2 3. Outdoor unit parts list.................02-6 3-1. Models: AOHG45KRTA and AOHG54KRTA..............02-6 4. Accessories ....................02-10 4-1. Indoor unit ........................02-10 4-2. Outdoor unit........................02-10 5. Optional parts ...................02-11 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. Models: ARXG45KHTB and ARXG54KHTB ¢ Casing and fan (Connector : white) (Connector : black) - (02-2) - 2-1. Models: ARXG45KHTB and ARXG54KHTB 2. Indoor unit parts list...
  • Page 17 Item no. Part no. Part name Service part 9372576014 Plate Top Sub Assy ♦ 9372637029 Kit (Panel Front Sub Assy) ♦ 9372035009 Panel Fan Assy ♦ 9602802012 Motor, Induct ♦ 9372057018 Casing A ♦ 9372058015 Casing B ♦ 9372059029 Sirocco Fan ♦...
  • Page 18 ¢ Main PC board - (02-4) - 2-1. Models: ARXG45KHTB and ARXG54KHTB 2. Indoor unit parts list...
  • Page 19 Item no. Part no. Part name Service part 9710661082 Power supply PCB ♦ 9711870223 Main PCB (45) ♦ 9711870230 Main PCB (54) ♦ 9710019005 Communication PCB ♦ 9306489045 Terminal 3P ♦ 9900896027 Terminal 5P ♦ 9900294014 Relay ♦ 9900269111 Capacitor, Plastic ♦...
  • Page 20 3. Outdoor unit parts list 3-1. Models: AOHG45KRTA and AOHG54KRTA ¢ Exterior parts and chassis - (02-6) - 3-1. Models: AOHG45KRTA and AOHG54KRTA 3. Outdoor unit parts list...
  • Page 21 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 ♦ 9901031014 Heatsink thermistor ♦...
  • Page 22 ¢ Compressor - (02-8) - 3-1. Models: AOHG45KRTA and AOHG54KRTA 3. Outdoor unit parts list...
  • Page 23 Item no. Part no. Part name Service part 9380516019 S-ABS (top) ♦ 9379647168 S-ABS (body) ♦ 9900565091 Thermistor (Outdoor temp.) ♦ 9900186029 Pressure switch ♦ 9374425624 4-way valve assy ♦ 9970194016 Solenoid ♦ 9970158018 Sensor ♦ 9384848000 Accumulator assy (service) ♦...
  • Page 24 4. Accessories 4-1. Indoor unit ¢ Models: ARXG45KHTB and ARXG54KHTB Part name Exterior Q’ty Part name Exterior Q’ty Coupler heat insulation Operation manual (small) Operation manual Washer (CD-ROM) Installation manual Cable tie Coupler heat insulation (large) 4-2. Outdoor unit ¢ Models: AOHG45KRTA and AOHG54KRTA Part name Exterior Q’ty...
  • Page 25 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 26 ¢ Others Exterior Part name Model name Summary Thermo-sensor for sensing the Remote sensor UTY-XSZX temperature of arbitrary place in the unit room. Long-life filter can be mounted to the Long-life filter UTD-LF60KA indoor unit. Use to connect with various peripheral devices and air conditioner PCB.
  • Page 27 Exterior Part name Model name Summary This converter is required when Network connecting single split system to VRF converter UTY-VTGXV network system. (AC power Connecting point: CN65 or CN75 on supply) Main PCB Air conditioner switching can be controlled by connecting other external External switch UTY-TERX sensor switches.
  • Page 28 6. Refrigerant system diagrams 6-1. Models: AOHG45KRTA and 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)
  • Page 29 7. Wiring diagrams 7-1. Indoor unit ¢ Models: ARXG45KHTB and ARXG54KHTB - (02-15) - 7-1. Indoor unit 7. Wiring diagrams...
  • Page 30 7-2. Outdoor unit ¢ Models: AOHG45KRTA and AOHG54KRTA - (02-16) - 7-2. Outdoor unit 7. Wiring diagrams...
  • Page 31 8. PC board diagrams 8-1. Models: ARXG45KHTB and ARXG54KHTB CONTROL UNIT 45 model : EZ-0210DHSE 54 model : EZ-0210EHSE TERMINAL EMI FILTER HP-T3063-13-5P-L3S1 DC5V ZCAT1518-0730 CN8-1 BLACK 2 TURNS THERMISTOR ( ROOM TEMP. ) B02B-XASK-1-A CN8-2 BLACK UL1007 AWG22 CN300-1 WHITE CN300 UL1007 AWG22...
  • Page 32 8-2. Models: AOHG45KRTA and AOHG54KRTA 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 33 3. TROUBLESHOOTING 2022.04.07 SR_CH03_AR040EG_02...
  • Page 34 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 (Wired remote controller)..............03-2 1-4. Error code table (Outdoor unit) ..................03-3 2. Troubleshooting with error code ...............03-5 2-1.

  • Page 35: Table Of Contents

    CONTENTS (continued) 4-2. Inverter compressor......................03-44 4-3. Outdoor unit Electronic Expansion Valve (EEV) ............03-45 4-4. Indoor unit fan motor ....................03-47 4-5. Outdoor unit fan motor ....................03-48 4-6. Pressure switch ......................03-49 4-7. 4-way valve coil (solenoid coil)/4-way valve ...............03-50 4-8. Discharge pressure sensor..................03-51 5.
  • Page 37 1. Error code When 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 LED lamps to indicate the error content.
  • Page 38 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 39 1-4. 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 "Function settings (For outdoor unit)"...
  • Page 40 PUMP LOW NOISE PEAK CUT POWER/ DOWN Error contents ERROR MODE E: A3. Compressor temperature error ■ ● ■ ■ ○ ○ ○ ● (Outdoor unit) E: AC. Heat sink temperature error ■ ● ■ ■ ○ ○ ● ● (Outdoor unit) ●...

  • Page 41: 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 42 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 43: 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 Main PCB Indoor unit When the outdoor unit cannot properly receive the serial Detective actuator Fan motor signal from indoor unit for 10 seconds or more. Outdoor unit Main PCB Connection failure...
  • Page 44 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 45: 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 wired remote controller more than following time during normal operation. Detective actuator Wired remote control •...

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

    2-4. E: 23. Combination error (Outdoor unit) Wired 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)

    2-5. 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 48: E: 41. Room Temperature Sensor Error (Indoor Unit)

    2-6. 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 49: E: 42. Indoor Unit Heat Exchanger Sensor Error (Indoor Unit)

    2-7. 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 50: E: 53. Drain Pump Error (Indoor Unit)

    2-8. 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 51: E: 62. Outdoor Unit Main Pcb Error (Outdoor Unit)

    2-9. 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 52: E: 63. Inverter Error (Outdoor Unit)

    2-10. 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 53: E: 64. Pfc Circuit Error (Outdoor Unit)

    2-11. E: 64. PFC circuit error (Outdoor unit) Wired remote Indicator Error code E: 64 controller • When inverter input DC voltage is higher than 420 V for over 3 seconds, the compressor stops. Detective actuator Outdoor unit Main PCB •...

  • Page 54: E: 65. Trip Terminal L Error (Outdoor Unit)

    2-12. 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 55: E: 71. Discharge Thermistor Error (Outdoor Unit)

    2-13. 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 56: E: 72. Compressor Thermistor Error (Outdoor Unit)

    2-14. 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 57: E: 73. Heat Exchanger (Middle/Outlet) Temperature Thermistor Error (Outdoor Unit)

    2-15. 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 58: E: 74. Outdoor Temperature Thermistor Error (Outdoor Unit)

    2-16. 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 59: E: 77. Heat Sink Thermistor Error (Outdoor Unit)

    2-17. 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 60: E: 84. Current Sensor Error (Outdoor Unit)

    2-18. 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 61: E: 86. Pressure Sensor Error (Outdoor Unit)

    2-19. E: 86. Pressure sensor 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 62: E: 94. Trip Detection (Outdoor Unit)

    2-20. 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 63: E: 95. Compressor Motor Control Error (Outdoor Unit)

    2-21. 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 64: E: 97. Outdoor Unit Fan Motor Error (Outdoor Unit)

    2-22. 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 65: E: 99. 4-Way Valve Error (Outdoor Unit)

    2-23. 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 66 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 03-43. • Solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.97 kΩ. →...
  • Page 67 2-24. 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 68 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. ↓ - (03-32) - 2-24. E: A1. Discharge temperature error (Outdoor unit) 2.
  • Page 69 2-25. 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 70 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. ↓ - (03-34) - 2-25. E: A3. Compressor temperature error (Outdoor unit) 2.
  • Page 71 2-26. 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 72 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 73 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 74 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 75 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 76 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 77 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 78 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 79 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 80: Inverter Compressor

    4-2. Inverter compressor 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 P400(U) P401(V) P402(W) BLACK WHITE...

  • Page 81: Outdoor Unit Electronic Expansion Valve (Eev)

    4-3. Outdoor unit Electronic Expansion Valve (EEV) 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 02-15. Check point 2.
  • Page 82 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 83: Indoor Unit Fan Motor

    4-4. Indoor unit fan motor 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 84: Outdoor Unit Fan Motor

    4-5. Outdoor unit fan motor 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 85: Pressure Switch

    4-6. Pressure switch • 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 P770 - (03-49) - 4-6. Pressure switch 4. Service parts information...

  • Page 86: 4-Way Valve Coil (Solenoid Coil)/4-Way Valve

    4-7. 4-way valve coil (solenoid coil)/4-way valve 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 87: Discharge Pressure Sensor

    4-8. Discharge pressure sensor Check point 1. Check voltage from main PCB With the connector connected to the PCB, measure the voltage between P20:2-3 of the Main PCB. PRESSURE WHITE SENSOR BLACK (HIGH) Characteristics of pressure sensor 725 / 5.0 Pressure psi / MPa 14.5 29.0...

  • Page 88: Thermistor Resistance Values

    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 89: Outdoor Unit

    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 90 ¢ 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 91 ¢ Compressor 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 92 ¢ 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 93 4. CONTROL AND FUNCTIONS 2022.02.04 SR_CH04_AR040EG_01...
  • Page 94 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 95: 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 96: 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 6.0 °C lower than a set temperature, the operation rotation number of compressor will attain to maximum performance.

  • Page 97: Rotation Number Of Compressor At Normal Start-Up

    1-4. Rotation number of compressor at normal start-up 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 Time 5...

  • Page 98: 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 99 • 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 100: 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 101 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 102: Fan Control

    3. Fan control Tr: Room temperature Ts: Setting temperature 3-1. Indoor fan control ¢ Fan operation Airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH while indoor unit fan only runs. When fan mode is set at AUTO, it operates on MED fan speed. ¢...
  • Page 103 ¢ 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 104: 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 Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry Heating...

  • Page 105: 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: When the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 106 ¢ 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 107: Wired Remote Control

    4-2. 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 108 ¢ 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 109 ¢ 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 110: 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 111: 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 112: Various Control

    6. Various control 6-1. 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 113: 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 When outdoor temperature reaches 26°C, compressor preheating stops. – 30 minutes after compressor stopped •...

  • Page 114: Drain Pump Control

    6-8. 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 115  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 116: Prevention To Restart For 3 Minutes (3 Minutes St)

    6-9. 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. 6-10.

  • Page 117: 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 AOHG45KRTA Heating Cooling/Dry AOHG54KRTA Level 2...

  • Page 118: Unit Status Monitoring And The Detected Value Indication

    6-13. Unit status monitoring and the detected value indication The wired remote controller can monitor the indoor and outdoor units' status and display the detect- ed result as a relevant ID. For details of the display method, refer to the Chapter of “Display Sensor Values” in the Installation Manual of Wired remote controller (Touch panel).
  • Page 119 Available Sensor ID Sensor ID Item Unit Remarks 0: Off, 1: On —: When the function setting 46 is not set Operation or Stop (External input) 00: — NOTE: Available only for external input port of the indoor unit 0: Off, 1: On —: When the function setting 46 is not set Emergency stop (External input)
  • Page 120 Available Sensor ID Sensor ID Item Unit Remarks 0: Off, 1: On External output command by remote NOTE: The value is output even if 00: — controller (External output) the function setting or rotary switch is not set. 0: Off, 1: On Set-point temp.
  • Page 121 Available Sensor ID Sensor ID Item Unit Remarks Compressor total cooling operation 11: h hours Compressor total operation hours 11: h Outdoor unit fan 1 total operation 11: h hours Outdoor unit fan 2 total operating 11: h hours Outdoor low noise input (External 00: —...

  • Page 122: 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. • 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 123: 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 124: Compressor Temperature Protection

    7-5. Compressor temperature protection When the compressor temperature sensor detects higher than the trigger condition below, the com- pressor is stopped. When the compressor temperature sensor detects the release condition, the pro- tection is released. Trigger condition 108°C 80°C Release condition (3 minutes after compressor stop) 7-6.

  • Page 125: High Temperature And High Pressure Release Control

    7-8. High temperature and high pressure release control The compressor is controlled as follows. • 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 Operation...
  • Page 126 - (04-32) - 7-8. High temperature and high pressure release control 7. Various protections...
  • Page 127 5. FILED WORKING 2022.04.07 SR_CH05_AR040EG_02...
  • Page 128 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 ..............05-2 2. Function settings (For outdoor unit) ............05-7 2-1. Control PCB and switch buttons location................05-7 2-2. Local setting procedure ....................05-9 3.

  • Page 129: 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. ¢...

  • Page 130: 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 131 2) Room temperature control for indoor unit sensor NOTE: If the remote sensor unit option is selected, perform this setting. 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. The temperature of the room temperature sensor is corrected as follows: Corrected temp.
  • Page 132 3) 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 133 6) 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 ♦ 7) External input control "Operation/Stop" mode or "Forced stop" mode can be selected. Function number Setting value Setting description...
  • Page 134 10) 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 - (05-6) -...

  • Page 135: 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 136 ¢ 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 137: 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 138 ¢ 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 139: External Input And Output (For Indoor Unit)

    3. External input and output (For indoor unit) CN48 (IR receiver) Rotary switch CN65 CN75 Terminal (External in) CN47 (External out) Fig. Indoor unit PCB Fig. External input and output PCB Connecting point Input/Output Function Input select Input signal Operation/Stop Terminal Input Dry contact...

  • Page 140: External Input

    3-1. External input • “Operation/Stop” mode or "Forced stop" mode can be selected with function setting of indoor unit. • A twisted pair cable should be used. Maximum length of cable is 150 m. • Use an external input and output cable with appropriate external dimension, depending on the number of cables to be installed.
  • Page 141 ¢ 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 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 (22 AWG) should be used. Maximum length of cable is 25 m. •...

  • Page 143: Setting Of External Input And Output

    3-3. Setting of external input and output • Indoor unit Input Connection point Function setting number 46 Function Operation/Stop mode 1 (Setting prohibited) Terminal Forced stop mode Operation/Stop mode 2 Output Connection point Function setting number 60 Function Operation status 01 to 08 (Setting prohibited) CN47...

  • Page 144: Details Of Control Input Function

    3-4. Details of control input function ¢ Operation/Stop mode 1 • In the case of "Edge" input External input and output PCB Function External input Input signal Command setting Rotary switch Off → On Operation — Input of indoor unit Terminal On →...
  • Page 145 ¢ Forced stop • In the case of "Edge" input External input and output PCB Function External input Input signal Command setting Rotary switch Forced stop Off → On (R.C. disabled) — Input of indoor unit Terminal Normal On → Off (R.C.
  • Page 146 ¢ Operation/Stop mode 2 • In the case of "Edge" input External input and output PCB Function External input Input signal Command setting Rotary switch Operation Off → On (R.C. enabled) — Input of indoor unit Terminal Stop On → Off (R.C.
  • Page 147 ¢ Forced thermostat off External input and output External input Input signal Command Rotary switch Off → On Thermostat off External input and 2, B, C, D Ex IN 1 output PCB On → Off Normal operation Ex IN 1 Compressor Room temp.

  • Page 148: Details Of Control Output Function

    3-5. Details of control output function ¢ Operation status External input and Function output PCB External output Output signal Status setting Rotary switch Off → On Operation 60-00 — Output of indoor unit CN47 On → Off Stop Off → On Operation External input and —...
  • Page 149 ¢ Indoor unit fan operation status External input and Function output PCB External output Output signal Status setting Rotary switch Off → On Fan run 60-10 — Output of indoor unit CN47 On → Off Fan stop Off → On Fan run External input and —...
  • Page 150 ¢ External heater output External input and Function output PCB External output Output signal Control setting Rotary switch Off → On Heater on 60-11 — Output of indoor unit CN47 On → Off Heater off Off → On Heater on External input and —...

  • 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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