Fujitsu ASUH24LPAS Service Manual
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Fujitsu ASUH24LPAS Service Manual

Wall mounted type
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AIR CONDITIONER
Wall mounted type
INDOOR
OUTDOOR
SERVICE MANUAL
ASUH18LPAS
ASUH24LPAS
AOUH18LPAS1
AOUH24LPAS1
SR_AS051EF_03
2022.10.12

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  • Page 1 AIR CONDITIONER Wall mounted type SERVICE MANUAL INDOOR ASUH18LPAS ASUH24LPAS OUTDOOR AOUH18LPAS1 AOUH24LPAS1 SR_AS051EF_03 2022.10.12...
  • Page 2 • Product specifications and design are subject to change without notice for future improvement. • For further details, please check with our authorized dealer. Trademarks ™ FGLair is trademark of Fujitsu General Limited in the United States, other countries or both. ™ Google Play is trademark of Google LLC. ®...
  • Page 3 CONTENTS 1. GENERAL INFORMATION 2. TECHNICAL DATA AND PARTS LIST 3. TROUBLESHOOTING 4. CONTROL AND FUNCTIONS 5. FILED WORKING...
  • Page 5 1. GENERAL INFORMATION 2022.10.12 SR_CH01_AS051EF_02...
  • Page 6 CONTENTS 1. GENERAL INFORMATION 1. Specifications....................01-1 1-1. Indoor unit ........................01-1 1-2. Outdoor unit........................01-3 2. Dimensions....................01-4 2-1. Indoor unit ........................01-4 2-2. Outdoor unit........................01-6...
  • Page 7 1. Specifications 1-1. Indoor unit Wall mounted Type Inverter heat pump Model name ASUH18LPAS ASUH24LPAS Power supply 208/230 V ~60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V 5.28 7.03 Rated Btu/h 18,000 24,000 Cooling 1.17—5.57 1.17—7.15 Min.—Max.
  • Page 8 Wall mounted Type Inverter heat pump Model name ASUH18LPAS ASUH24LPAS °F (°C) 64 to 90 (18 to 32) Cooling Operation range 80 or less Heating °F (°C) 86 or less (30 or less) ™ Remote controller type Wireless (Wired, Mobile app*...
  • Page 9 1-2. Outdoor unit Type Inverter heat pump Model name AOUH18LPAS1 AOUH24LPAS1 Power supply 208/230 V ~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V Starting current 11.4 Cooling 1,348 (2,290) 1,560 (2,650) Airflow rate CFM (m Heating 1,348 (2,290) 1,560 (2,650)
  • Page 10 2. Dimensions 2-1. Indoor unit ¢ Models: ASUH18LPAS and ASUH24LPAS Unit: in (mm) 38-9/16 (980) 9-7/16 (240) 16-7/16 (417) 19 (482) 20-1/16 (510) 3-1/16 16-1/4 (413) 15-3/4 (400) 3-9/16 (77) (90) Outline of indoor unit for pipe inlet for pipe inlet Ø3-1/8 (80)
  • Page 11  Installation space requirement Provide sufficient installation space for product safety. Unit: in (mm) 2 (40) or more Wall hook bracket 3 (70) or more 5 (117) or more Outline of the indoor unit 7 (160) or more 60 (1,500) or more - (01-5) - 2-1.
  • Page 12 2-2. Outdoor unit ¢ Models: AOUH18LPAS1 and AOUH24LPAS1 Unit: in (mm) 4-M10 hole 22-13/16 (580) 4-5/16 (109) Pitch of bolts for installation Top view 3/4 (19) 31-7/16 (799) 2-11/16 (68) 1/2 (13) 11-7/16 (290) 1-5/16 (33) 1-3/16 (30) Side view Front view Side view Airflow...
  • Page 13 2. TECHNICAL DATA AND PARTS LIST 2021.07.04 SR_CH02_AS051EF_01...
  • Page 14 CONTENTS 2. TECHNICAL DATA AND PARTS LIST 1. Precautions....................02-1 2. Indoor unit parts list..................02-2 2-1. Models: ASUH18LPAS and ASUH24LPAS..............02-2 3. Outdoor unit parts list.................02-6 3-1. Models: AOUH18LPAS1 and AOUH24LPAS1 ...............02-6 4. Accessories ....................02-10 4-1. Indoor unit ........................02-10 4-2. Outdoor unit........................02-10 5.
  • Page 15 • Service parts information and design are subject to change without notice for product improve- ment. • For the latest information of the service parts, refer to our Service Portal. https://fujitsu-general.force.com/portal/ • Precise figure of the service parts listed in this manual may differ from the actual service parts. - (02-1) -...
  • Page 16 2. Indoor unit parts list 2-1. Models: ASUH18LPAS and ASUH24LPAS ¢ Exterior parts and Accessories - (02-2) - 2-1. Models: ASUH18LPAS and ASUH24LPAS 2. Indoor unit parts list...
  • Page 17 9333608006 Bush ♦ Wire with connector — 9901010071 ♦ (CN75 on main PCB—WLAN adapter) — Front panel — — Panel cover — — Front panel B — - (02-3) - 2-1. Models: ASUH18LPAS and ASUH24LPAS 2. Indoor unit parts list...
  • Page 18 ¢ Chassis - (02-4) - 2-1. Models: ASUH18LPAS and ASUH24LPAS 2. Indoor unit parts list...
  • Page 19 Crossflow fan assy ♦ 9387587173 Base assy ♦ — Control box — — Control cover — — Display case — — Motor case — — Motor cover assy — - (02-5) - 2-1. Models: ASUH18LPAS and ASUH24LPAS 2. Indoor unit parts list...
  • Page 20 3. Outdoor unit parts list 3-1. Models: AOUH18LPAS1 and AOUH24LPAS1 ¢ Exterior parts and chassis - (02-6) - 3-1. Models: AOUH18LPAS1 and AOUH24LPAS1 3. Outdoor unit parts list...
  • Page 21 Item no. Part no. Part name Service part 9322556028 Top panel assy ♦ 9322811028 Protective net assy ♦ 9322552242 Cabinet right assy ♦ 9384276001 Conduit cover ♦ 9322570062 Switch cover assy ♦ 9322314024 Base assy ♦ 9322144003 Drain pipe ♦ 9709686348 Main PCB (for 18 model) ♦...
  • Page 22 ¢ Compressor - (02-8) - 3-1. Models: AOUH18LPAS1 and AOUH24LPAS1 3. Outdoor unit parts list...
  • Page 23 Item no. Part no. Part name Service part 9810541000 Compressor ♦ 9322446015 4-way valve assy ♦ 9970194023 Solenoid ♦ 9970173028 Expansion valve coil ♦ 9322463029 Pulse motor valve assy ♦ 9322474001 2-way valve assy ♦ 9387831016 3-way valve assy ♦ 9322824004 S-insulator K ♦...
  • Page 24 4. Accessories 4-1. Indoor unit ¢ Models: ASUH18LPAS and ASUH24LPAS Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Tapping screw (large) Installation manual Tapping screw (small) Remote controller Battery Remote controller Wall hook bracket holder Cloth tape Ion deodorization filter...
  • Page 25 5. Optional parts 5-1. Indoor unit ¢ Controllers Exterior Part name Model name Summary Easy finger touch operation with LCD panel. Backlit LCD enables easy operation in a dark room. Wire type: Non-polar 2-wire Optional Communication Kit is necessary for installation. NOTE: When this remote controller is connected, wireless remote controller cannot be...
  • Page 26 FGL sales company. For connection between indoor unit Modbus UTY-VMSX with UART interface and a Modbus Converter open network. This converter can control Fujitsu Thermostat UTY-TTRX General products using a third-party Converter thermostat controller. This converter is required when...
  • Page 27 6. Refrigerant system diagrams 6-1. Models: AOUH18LPAS1 and AOUH24LPAS1 Heat exchanger 3-way (INDOOR) valve 2-way Muffler valve Muffler Strainer 4-way valve Expansion valve Accumulator Heat exchanger Strainer (OUTDOOR) Cooling Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat exchanger out temperature) : Thermistor (Pipe temperature) : Thermistor (Room temperature)
  • Page 28 7. Wiring diagrams 7-1. Indoor unit ¢ Models: ASUH18LPAS and ASUH24LPAS - (02-14) - 7-1. Indoor unit 7. Wiring diagrams...
  • Page 29 7-2. Outdoor unit ¢ Models: AOUH18LPAS1 and AOUH24LPAS1 - (02-15) - 7-2. Outdoor unit 7. Wiring diagrams...
  • Page 30 8. PC board diagrams 8-1. Models: ASUH18LPAS and ASUH24LPAS CONTROL UNIT 18 model : EZ-0201KHSE 24 model : EZ-0201LHSE OPTION UNIT (2-WIRE REMOTE CONTROLLER) TERMINAL AWG22 AWG22 BLACK CN301 OUTDOOR UNIT CN14 CN300 AWG22 WHITE AWG26 AWG22 CN13 B07B-PASK-1 POWER SOURCE WHITE B3 ( 5.0 ) B-XASK-1-A...
  • Page 31 8-2. Models: AOUH18LPAS1 and AOUH24LPAS1 INVERTER ASSEMBLY 18, 24 models : EZ-02012HUE EMI FILTER KRFC-13 EMI FILTER EMI FILTER 2 TURNS KRFC-13 KRFC-13 UL3271 2 TURNS 1 TURN AWG16 COMPRESSOR W400 UL1015 UL3271 AWG20 AWG16 BLACK W103 W401 WHITE WHITE UL3271 UL1015 AWG16...
  • Page 32 - (02-18) - 8-2. Models: AOUH18LPAS1 and AOUH24LPAS1 8. PC board diagrams...
  • Page 33 3. TROUBLESHOOTING 2021.08.04 SR_CH03_AS051EF_01...
  • 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 (Indoor unit and wired remote controller)..........03-2 2. Troubleshooting with error code ...............03-3 2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit).....03-3 2-2.

  • Page 35: Table Of Contents

    CONTENTS (continued) 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 5. Thermistor resistance values..............03-55 5-1. Indoor unit ........................03-55 5-2. Outdoor unit........................03-56...
  • 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 in- dicator lamps to show the error content.
  • Page 38 1-3. Error code table (Indoor unit and 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. Indoor unit display Wired remote Error contents Operation [ ] Timer [ ] Economy [ ]...
  • Page 39 2. Troubleshooting with error code 2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit) Operation indicator 1 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 11 Main PCB When the indoor unit cannot receive the serial signal from outdoor unit more than 2 minutes after power on, Detective actuator...
  • Page 40 Check point 4. Check serial signal (Reverse transfer signal) Check serial signal (Reverse transfer signal) GREEN WHITE BLACK WHITE BLACK • Check if indicated value swings between AC 90 V and AC 270 V at the outdoor unit terminal 1 —3.
  • Page 41 2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit) Operation indicator 1 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 11 Main PCB When the indoor unit cannot receive the serial signal from outdoor unit more than 2 minutes after power on, Detective actuator Indoor unit...
  • Page 42 Check point 4. Check serial signal (reverse transfer signal) Check serial signal (Forward transfer signal) GREEN WHITE BLACK WHITE BLACK • Check if indicated value swings between AC 30 V and AC 130 V at outdoor unit terminal 2—3. • If it is abnormal, replace main PCB.
  • Page 43 2-3. E: 12. Wired remote controller communication error (Indoor unit) Operation indicator 1 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 12 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...
  • Page 44 2-4. E: 18. External communication error (Indoor unit) Operation indicator 1 time flash Timer indicator 8 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 18 External After receiving a signal from the external input and Detective actuator Indoor unit communication output PCB, the same signal has not been received for...
  • Page 45 2-5. E: 32. Indoor unit main PCB error (Indoor unit) Operation indicator 3 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 32 When power is on and there is some below case. Detective actuator Indoor unit main PCB...
  • Page 46 2-6. E: 35. MANUAL AUTO button error (Indoor unit) Operation indicator 3 time flash Timer indicator 5 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 35 Indoor unit controller PCB When the MANUAL AUTO button becomes on for Detective actuator Indicator PCB consecutive 30 or more seconds.
  • Page 47 2-7. E: 41. Room temperature sensor error (Indoor unit) Operation indicator 4 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 41 Indoor unit main PCB Room temperature thermistor is open or short is Detective actuator detected always.
  • Page 48 2-8. E: 42. Indoor unit heat exchanger sensor error (Indoor unit) Operation indicator 4 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 42 Indoor unit main PCB When heat exchanger temperature thermistor open or Detective actuator Heat exchanger temperature short circuit is detected.
  • Page 49 2-9. E: 51. Indoor unit fan motor error (Indoor unit) Operation indicator 5 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 51 main PCB When the actual rotation number of the indoor unit fan Detective actuator Indoor unit motor is below 1/3 of the target rotation number...
  • Page 50 2-10. E: 58. Intake grille error (Indoor unit) Operation indicator 5 time flash Timer indicator 8 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 58 Indoor unit main PCB When the Micro switch is detected open while running Detective actuator the compressor.
  • Page 51 2-11. E: 62. Outdoor unit main PCB error (Outdoor unit) Operation indicator 6 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 62 Access to EEPROM failed due to some cause after Detective actuator Outdoor unit Main PCB...
  • Page 52 2-12. E: 63. Inverter error (Outdoor unit) Operation indicator 6 time flash Timer indicator 3 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 63 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...
  • Page 53 2-13. E: 64. PFC circuit error (Outdoor unit) Operation indicator 6 time flash Timer indicator 4 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 64 • When inverter input DC voltage is higher than 415 V for over 3 seconds, the compressor stops. Detective actuator Outdoor unit Main PCB...
  • Page 54 2-14. E: 65. IPM error (Outdoor unit) Operation indicator 6 time flash Timer indicator 5 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 65 Main PCB 1. When more than normal operating current to IPM in main PCB flows, the compressor stops.
  • Page 55 Check point 4. Check compressor Check compressor. (Refer to inverter compressor in "Service parts information".) ↓ Check point 5. Replace main PCB If Check point 1 to 4 do not improve the symptom, change main PCB. ↓ - (03-19) - 2-14.
  • Page 56 2-15. E: 71. Discharge thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 71 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...
  • Page 57 2-16. E: 72. Compressor thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 72 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...
  • Page 58 2-17. E: 73. Outdoor unit heat exchanger thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 3 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 73 Outdoor unit main PCB When heat exchanger temperature thermistor open or Detective actuator short circuit is detected at power on or while running the Heat exchanger temperature...
  • Page 59 2-18. E: 74. Outdoor temperature thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 4 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 74 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...
  • Page 60 2-19. E: 84. Current sensor error (Outdoor unit) Operation indicator 8 time flash Timer indicator 4 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 84 When input current sensor has detected 0 A, while inverter compressor is operating at higher than 56 rps, Detective actuator Outdoor unit main PCB...
  • Page 61 2-20. E: 94. Trip detection (Outdoor unit) Operation indicator 9 time flash Timer indicator 4 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 94 Main PCB Protection stop by over-current generation after inverter compressor start processing completed generated consecutively 10 times.
  • Page 62 2-21. E: 95. Compressor motor control error (Outdoor unit) Operation indicator 9 time flash Timer indicator 5 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 95 Main PCB 1. When running the compressor, if the detected rotor location is out of phase with actual rotor location more than 90°, the compressor stops.
  • Page 63 2-22. E: 97. Outdoor unit fan motor error (Outdoor unit) Operation indicator 9 time flash Timer indicator 7 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 97 Main PCB 1. When outdoor fan rotation speed is less than 100 rpm in 20 seconds after fan motor starts, fan motor stops.
  • Page 64 2-23. E: 99. 4-way valve error (Outdoor unit) Operation indicator 9 time flash Timer indicator 9 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 99 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,...
  • Page 65 Check point 3. Check the solenoid coil and 4-way valve • Solenoid coil Remove CN30 from PCB and check the resistance value of coil. Resistance value is about 1.88 kΩ — 2.29 kΩ (at 68 °F [20 °C]). → If it is open or abnormal resistance value, replace solenoid coil. •...
  • Page 66 2-24. E: A1. Discharge temperature error (Outdoor unit) Operation indicator 10 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: A1 Outdoor unit main PCB Protection stop by discharge temperature ≥ 230 °F Detective actuator (110 °C) during compressor operation generated 2 times Discharge temperature thermistor...
  • Page 67 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. ↓ - (03-31) - 2-24. E: A1. Discharge temperature error (Outdoor unit) 2.
  • Page 68 2-25. E: A3. Compressor temperature error (Outdoor unit) Operation indicator 10 time flash Timer indicator 3 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: A3 Outdoor unit main PCB Protection stop by compressor temperature ≥ 226 °F Detective actuator (108 °C) during compressor operation generated 2 times Compressor temperature thermistor...
  • Page 69 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. ↓ - (03-33) - 2-25. E: A3. Compressor temperature error (Outdoor unit) 2.
  • Page 70 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 71 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 72 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 73 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 74 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 75 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 76 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 77 3-7. Too warm House insulation setting has not been changed. Temperature sensing location has not been changed. Forecast of cause Installation location of the wired remote. Function settings have not been changed. Check point 1. Check insulation level of structure of house Is insulation level greater than R-13? →...
  • Page 78 Check point 6. Check the remote controller Hold down the THERMO SENSOR button until the thermo sensor icon is turned off. → If the space is still too warm, go to "Check point 7". ↓ Check point 7. Check function settings Using the table on the right adjust function 31.
  • Page 79 Check point 10. Location of the remote controller Is the mounting location of the wired remote controller affecting the temperature sensing? (Sunlight on the remote, heat source next to the remote) → If no, go to "Check point 12". ↓ Check point 11.
  • Page 80 Check point 9-1. Check function setting Change setting of function 48 (Room temperature sensor switching) to 01. NOTE: For details of function setting number 48, refer to "Function settings " in Chapter 5. FIELD WORKING on page 05-1. ↓ Check point 9-2. Check the effects of function setting change Did this function setting improve temperature control? →...
  • Page 81 3-8. Too cool House insulation setting has not been changed. Temperature sensing location has not been changed. Forecast of cause Installation location of the wired remote. Function settings have not been changed. Check point 1. Check insulation level of structure of house Is insulation level greater than R-13? →...
  • Page 82 Check point 6. Check the remote controller Hold down the THERMO SENSOR button until the thermo sensor icon is turned off. → If the space is still too cool, go to "Check point 7". ↓ Check point 7. Check function settings Using the table on the right adjust function 30.
  • Page 83 Check point 10. Location of the remote controller Is the mounting location of the wired remote controller affecting the temperature sensing? (Sunlight on the remote, heat source next to the remote) → If no, go to "Check point 12". ↓ Check point 11.
  • Page 84 Check point 9-1. Check function setting Change setting of function 48 (Room temperature sensor switching) to 01. NOTE: For details of function setting number 48, refer to "Function settings " in Chapter 5. FIELD WORKING on page 05-1. ↓ Check point 9-2. Check the effects of function setting change Did this function setting improve temperature control? →...
  • Page 85 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 86: Inverter Compressor

    4-2. Inverter compressor Check point 1. Check connection Check terminal connection of compressor. (loose or incorrect wiring) Terminal cover opened T(W) (BLACK) S(V) R(U) (WHITE) (RED) ↓ Check point 2. Check winding resistance Check winding resistance of each terminal. Resistance value: 1.916 Ω ±8 % at 68 °F (20 °C) →...

  • Page 87: 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 02-14. Check point 2.
  • Page 88 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 89: 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 90: 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 91: Thermistor Resistance Values

    5. Thermistor resistance values 5-1. Indoor unit ¢ Room temperature thermistor Temperature °F (°C) Resistance (kΩ) Voltage (V) 14.0 (-10.0) 58.25 0.73 23.0 (-5.0) 44.03 0.93 32.0 (0.0) 33.62 1.15 41.0 (5.0) 25.93 1.39 50.0 (10.0) 20.18 1.66 59.0 (15.0) 15.84 1.94 68.0 (20.0)
  • Page 92 5-2. Outdoor unit ¢ Discharge temperature thermistor Temperature °F (°C) Resistance (kΩ) Voltage (V) -22.0 (-30.0) 1,000.13 0.06 -12.0 (-25.0) 720.28 0.09 -4.0 (-20.0) 525.51 0.12 5.0 (-15.0) 388.12 0.16 14.0 (-10.0) 289.97 0.22 23.0 (-5.0) 219.01 0.28 32.0 (0.0) 167.12 0.36 41.0 (5.0)
  • Page 93 ¢ Compressor temperature thermistor Temperature °F (°C) Resistance (kΩ) Voltage (V) -22.0 (-30.0) 1,013.11 0.06 -12.0 (-25.0) 729.09 0.09 -4.0 (-20.0) 531.56 0.12 5.0 (-15.0) 392.31 0.16 14.0 (-10.0) 292.91 0.21 23.0 (-5.0) 221.09 0.28 32.0 (0.0) 168.60 0.36 41.0 (5.0) 129.84 0.46 50.0 (10.0)
  • Page 94 ¢ Heat exchanger temperature thermistor Temperature °F (°C) Resistance (kΩ) Voltage (V) -22.0 (-30.0) 1,078.85 0.02 -12.0 (-25.0) 777.69 0.03 -4.0 (-20.0) 567.89 0.04 5.0 (-15.0) 419.77 0.06 14.0 (-10.0) 313.87 0.08 23.0 (-5.0) 237.25 0.10 32.0 (0.0) 181.17 0.13 41.0 (5.0) 139.70 0.16...
  • Page 95 4. CONTROL AND FUNCTIONS 2021.08.04 SR_CH04_AS051EF_01...
  • Page 96 CONTENTS 4. CONTROL AND FUNCTIONS 1. Rotation number control of compressor...........04-1 1-1. Cooling operation ......................04-1 1-2. Heating operation ......................04-3 1-3. Dry operation ........................04-4 1-4. Rotation number of compressor at normal start-up ............04-4 1-5. Limitation of compressor rotation number by outdoor temperature.........04-5 2.

  • Page 97: Rotation Number Control Of Compressor

    However, the maximum rotation number is limited in the range shown in the figure below based on the indoor fan mode and the outdoor temperature. • Rotation number range of compressor Unit: rps Model name Minimum frequency Maximum frequency ASUH18LPAS ASUH24LPAS - (04-1) - 1-1. Cooling operation 1. Rotation number control of compressor...
  • Page 98 HIGH QUIET A zone B zone C zone ASUH18LPAS D zone E zone F zone A zone B zone C zone ASUH24LPAS D zone E zone F zone - (04-2) - 1-1. Cooling operation 1. Rotation number control of compressor...

  • Page 99: Heating Operation

    • Rotation number range of compressor Unit: rps Model name Minimum frequency Maximum frequency ASUH18LPAS ASUH24LPAS • Limit of maximum speed based on outdoor temperature In heating operation, maximum rotation number is defined by outdoor temperature and fan mode. Outdoor temperature rises Outdoor...

  • Page 100: Dry Operation

    Unit: rps Model name Outdoor temperature zone Operating frequency X zone ASUH18LPAS J zone Y zone X zone ASUH24LPAS J zone Y zone • Compressor control based on room temperature Room temperature rises Room temperature drops X zone Ts+3°F (Ts+1.5°C) Ts+1°F...

  • Page 101: Limitation Of Compressor Rotation Number By Outdoor Temperature

    1-5. Limitation of compressor rotation number by outdoor temperature The minimum rotation number of compressor is limited by outdoor temperature as below. • Cooling/Dry mode F zone 100.4°F (38°C) E zone 66.2°F (19°C) D zone 50.0°F (10°C) C zone 32.0°F (0°C) B zone 14.0°F...

  • Page 102: 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 64.4°F (18°C) and 86.0°F (30°C) in 1.8°F (1.0°C) steps.
  • Page 103 Operation flow chart Start Ts: Setting temperarure Monitor mode Room temp. > Ts+3.6°F(2°C)? Room temp. < Ts-3.6°F(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 104: 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 ASUH18LPAS ASUH24LPAS POWERFUL 1,310 1,490 HIGH 1,210 1,390 MED+ 1,130 1,320...
  • Page 105 ¢ Cooling operation Switch the airflow AUTO, and indoor fan motor will run according to room temperature, as below. On the other hand, if switched in HIGH—QUIET, indoor motor will run at a constant airflow of COOL operation modes QUIET, LOW, MED, HIGH as shown in “Fan speed” above. Airflow change over (Cooling: Auto) Tr - Ts ≥...
  • Page 106 ¢ 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 Indoor heat exchanger HIGH...
  • Page 107 • Powerful operation Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 107.6°F (42°C) 98.6°F HIGH (37°C) 102.2°F (39°C) 93.2°F (34°C) 98.6°F (37°C) 89.6°F Cool air prevention (32°C) 86.0°F (30°C) 82.4°F S-LOW (28°C) 7 minutes later: Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL...

  • Page 108: Outdoor Fan Control

    3-2. Outdoor fan control ¢ Outdoor fan motor This outdoor unit has a DC fan motor. (Control method is different between AC and DC motors.) ¢ Fan speed  Model: AOUH18LPAS1 Fan speed is defined by outdoor temperature and rotation number of compressor. •...
  • Page 109  Model: AOUH24LPAS1 Fan speed is defined by outdoor temperature and rotation number of compressor. • Outside air temperature zone selection Outside air Outside air temperature rises temperature drops Y zone 69.8°F ( 21°C) 66.2 °F Z zone (19°C) 53.6°F ( 12°C) 50.0 °F...

  • Page 110: Louver Control

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

  • Page 111: Swing Operation

    4-3. Swing operation • To select up/down airflow swing operation When the swing signal is received, the horizontal louver starts to swing. – Swinging range • Cooling mode/dry mode/fan mode (1 to 3): 1 ↔ 4 • Heating mode/fan mode (4 to 6): 3 ↔ 6 –...

  • Page 112: 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 113 ¢ 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 114: Wired Remote Control

    5-2. Wired remote control Temperature On/Off timer Program timer Sleep timer Weekly timer Setback 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 115 ¢ 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 116 ¢ Temperature Setback Timer • The temperature setback timer only changes the set temperature for 7 days, it cannot be used to start or stop air conditioner operation. • The temperature setback timer can be set to operate up to two times per day but only one temperature setting can be used.

  • Page 117: 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 118: 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 119: 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 120: Forced Cooling Operation

    7-3. Forced cooling operation The outdoor unit may not operate depending on the room temperature. When FORCED COOLING OPERATION button is pressed more than 10 seconds, forced cooling operation starts as shown in the table below. Operation mode Cooling Fan mode HIGH Timer mode Continuous (no timer setting available)

  • Page 121: Fresh Air Control

    7-6. 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 7-7. Compressor preheating By preheating the compressor, warm airflow is quickly discharged when the operation is started. •...

  • Page 122: Electronic Expansion Valve Control

    7-9. 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 52 and 480 pulses Heating mode 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 123: Unit Status Monitoring And The Detected Value Indication

    7-12. 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 124 Available Sensor ID Sensor ID Item Unit Remarks 0: Off, 1: On Cooling thermostat On/Off (External NOTE: The value is output even if 00: — output) the function setting or rotary switch is not set. 0: Off, 1: On Requested cooling strength On/Off NOTE: The value is output even if 00: —...

  • Page 125: 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 126: Current Release Control

    8-3. 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 127: Low Outdoor Temperature Protection

    8-6. Low outdoor temperature protection When the outdoor temperature sensor detects lower than the trigger condition below, the compres- sor is stopped. Operation mode Cooling/Dry Trigger condition 5°F (-15°C) Release condition 14°F (-10°C) 8-7. High temperature and high pressure release control The compressor is controlled as follows.
  • Page 128 - (04-32) - 8-7. High temperature and high pressure release control 8. Various protections...
  • Page 129 5. FILED WORKING 2021.08.04 SR_CH05_AS051EF_01...
  • Page 130 CONTENTS 5. FILED WORKING 1. Function settings ..................05-1 1-1. Function settings by using remote controller ..............05-1 1-2. Custom code setting for wireless remote controller ............05-10 2. External input and output.................05-11 2-1. External input........................05-12 2-2. External output ......................05-14 2-3. Combination of external input and output ..............05-16 2-4.

  • Page 131: Function Settings

    1. Function settings 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. After confirming the setting proce- dure and the content of each function setting, select appropriate functions for your installation envi- ronment.
  • Page 132 STEP 2: Selecting the function number and setting value 1. Press the TEMP./SELECT ( ) buttons to select the function Function number number. To switch between the left and right digits, press the MODE button. 2. Press the FAN SPEED button to proceed the setting value. To re- turn the function number selection, press the FAN SPEED button again.
  • Page 133 ¢ Contents of function setting Each function setting listed in this section is adjustable in accordance with the installation environ- ment. NOTE: Setting will not be changed if invalid numbers or setting values are selected.  Function setting list Function no. Functions Filter sign 30/31...
  • Page 134 2) Room temperature control for indoor unit sensor NOTE: Before performing this setting, refer to Function 95. 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 135 3) Room temperature control for wired remote controller sensor NOTE: Before performing this setting, refer to Function 95. 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“...
  • Page 136 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 137 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—04 Cooling thermostat On Heating operation Operation/Stop 07—08 Cooling thermostat On...
  • Page 138 13) Outdoor temperature zone boundary temperature A Setting required if changing of the outdoor temperature setting for heat pump prohibition zone is re- quired when auxiliary heater control by outdoor temperature 1 and 2 are performed on the indoor unit. For details, refer to “External heater output” in Chapter 2-4.
  • Page 139 16) Heat pump backup setting Enables or disables the heat pump backup instruction from the outdoor unit. This function will be usable provided that the corresponding outdoor unit is connected. Function number Setting value Setting description Factory setting Disable ♦ Enable 17) Emergency heat for external output terminal Enables or disables emergency heat input.

  • Page 140: Custom Code Setting For Wireless Remote Controller

    1-2. Custom code setting for wireless remote controller ¢ Custom code setting for wireless remote controller To interconnect the air conditioner and the wireless remote controller, assignment of the custom code for the wireless remote controller is required. NOTE: Air conditioner cannot receive a signal if the air conditioner has not been set for the custom code.

  • Page 141: External Input And Output

    2. External input and output External input and output PCB Indoor unit PCB CN47 (Ext. out) CN65 (Ext. in/out PCB) CN46 (Ext. in) SW301 SW302 Rotary switch CN314 CN313 CN312 CN311 CN310 CN308 Input External input External output Connector Input select signal Operation/Stop CN46...

  • Page 142: External Input

    2-1. External input With using external input function, some functions on this product can be controlled from an external device. • “Operation/Stop” mode or "Forced stop" mode can be selected with function setting of indoor unit. • A twisted pair cable (22AWG) should be used. Maximum length of cable is 492 ft (150 m). •...
  • Page 143 ¢ External Input and Output PCB The indoor unit Operation/Stop can be set by using the input connector on the PCB. • Input select: Use either one of these types of connectors according to the application. (Both types of connec- tors cannot be used simultaneously.) –...

  • Page 144: External Output

    2-2. 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 82 ft (25 m). •...
  • Page 145 ¢ External Input and Output PCB • A twisted pair cable (22AWG) should be used. Maximum length of cable is 82 ft (25 m). • Output voltage: High DC 12 V±2 V, Low 0 V. • Permissible current: 50 mA •...

  • Page 146: Combination Of External Input And Output

    2-3. 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 Indoor unit External Input and Output PCB...
  • Page 147 External output Indoor unit External Input and Output PCB Function Rotary Mode setting CN47 CN310 CN311 CN312 External heater Indoor unit fan 60-11 Operation/Stop Error status output operation status NOTE: Input of Operation/Stop depends on the setting of function setting 46. 00: Operation/Stop mode 1 (R.C.

  • Page 148: Details Of Function

    2-4. Details of function ¢ Control input function • When function setting is “Operation/Stop” mode 1 – In the case of “Edge” input: Function Rotary SW on External External input Input signal Command setting Input and Output PCB Off → On Operation External Input and 46-00...
  • Page 149 • When function setting is “Forced stop” mode – In the case of “Edge” input: Function Rotary SW on External External input Input signal Command setting Input and Output PCB Off → On Forced stop External Input and 46-02 CN313 Output PCB On →...
  • Page 150 • When function setting is “Operation/Stop” mode 2 – In the case of “Edge” input: Function Rotary SW on External External input Input signal Command setting Input and Output PCB Off → On Operation Stop External Input and 46-03 CN313 (Remote Output PCB On →...
  • Page 151 • Forced thermostat off function Rotary SW on External External input Input signal Command Input and Output PCB Off → On Thermostat off External Input and Output PCB CN313 On → Off Normal operation Input Compressor Room temp. Set temp. ¢...
  • Page 152 • Indoor unit fan operation status Rotary SW on External Output External output Command Input and Output PCB signal Off → On Fan run CN312 On → Off Fan stop Off → On Fan run External Input and Output PCB CN311 On →...
  • Page 153 ¢ External heater output Function setting Indoor unit Wired R. C. Control Primary heater Auxiliary heater Control switching external heaters Sensor activation* No. 61 Auxiliary heater Heat pump 61-00 — External device* control 1 Auxiliary heater Heat pump External device 61-01 —...
  • Page 154 • Inappropriate designing and installation of external heater may cause a fire by emitted heat from the external heater. • Fujitsu General Ltd. is not responsible for inappropriate designing or installation of external heating device.  Auxiliary heater control 1...
  • Page 155  Heat pump prohibition control Perform heating by external heater only. Indoor unit is continuous thermostat off. Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. •...
  • Page 156  Auxiliary heater control by outdoor temperature 1 This control selects heat pump or external heater according to the outdoor temperature. When out- door temperature is high, the heating is performed by using heat pump only. Operation Condition Heater on Heater is on as shown in following diagram of heating temperature.
  • Page 157 • Operation status 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Heat pump Heat pump Combination zone prohibition only zone Outdoor temperature zone * zone Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 158  Auxiliary heater control by outdoor temperature 2 This control selects heat pump or external heater according to the outdoor temperature. Even when outdoor temperature is high, the heating is performed by using both of heat pump and external heater. Operation Condition Heater on...
  • Page 159 • Operation status 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Heat pump Combination zone Outdoor temperature zone * prohibition zone Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 160  Auxiliary heater control by outdoor temperature 3 This control selects heat pump or external heater according to the outdoor temperature. Even when outdoor temperature is high, the heating is performed by using both of heat pump and external heater. Operation Condition Heater on...
  • Page 161 • Operation status Heat pump only zone 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Combination zone Outdoor temperature zone * Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 162  Auxiliary heat pump control • External heater output Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. • Other than heating mode Heater off •...
  • Page 163  Auxiliary heat pump control by outdoor temperature 1 • External heater output Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. •...
  • Page 164 • Operation status 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Heat pump Combination zone Outdoor temperature zone * prohibition zone Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 165  Auxiliary heat pump control by outdoor temperature 2 • External heater output Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. •...
  • Page 166 • Operation status Heat pump prohibition zone 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Combination zone Outdoor temperature zone * Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 167  Auxiliary heat pump control by outdoor temperature 3 • External heater output Operation Condition Heater on Heater is on as shown in following diagram of heating temperature. • Heater is off as shown in following diagram of heating temperature. •...
  • Page 168 • Operation status Heat pump prohibition zone 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting) -0.4°F (-18°C) -4°F (-20°C) Combination zone Outdoor temperature zone * Comp. On/Off 12 V Heater * The outdoor temperature zone transition from one to another will stay in that zone for minimum of 30 min. NOTE: In following operations, compressor will be on in heat pump prohibition zone.
  • Page 169 ¢ Heating thermostat on for humidifier Indoor unit Function External output setting Situation Mode Rotary SW Heating Indoor unit fan Heating thermostat on operation thermostat on no. 60 status 60-05 CN47 Example of 60-06 CN312 individual Not used 60-07 CN311 connection 60-08 CN310...

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