Fujitsu ASUH18LMAS Service Manual
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Fujitsu ASUH18LMAS Service Manual

Wall mounted type
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AIR CONDITIONER
Wall mounted type
INDOOR
OUTDOOR
SERVICE MANUAL
ASUH18LMAS
AOUH18LMAS1
AOUH24LMAS1
ASUH24LMAS
SR_AS052EF_03
2021.11.17
Table of Contents
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Summary of Contents for Fujitsu ASUH18LMAS

  • Page 1 AIR CONDITIONER Wall mounted type SERVICE MANUAL INDOOR ASUH18LMAS ASUH24LMAS OUTDOOR AOUH18LMAS1 AOUH24LMAS1 SR_AS052EF_03 2021.11.17...
  • 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 2021.11.01 SR_CH01_AS052EF_01...

  • Page 6: Table Of Contents

    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........................01-8...

  • Page 7: Specifications

    1. Specifications 1-1. Indoor unit Wall mounted Type Inverter heat pump Model name ASUH18LMAS ASUH24LMAS Power supply 208/230 V ~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V k→ 5.28 6.45 Rated Btu/h 18,000 22,000 Cooling k→...
  • Page 8 Wall mounted Type Inverter heat pump Model name ASUH18LMAS ASUH24LMAS °F (°C) 64 to 90 (18 to 32) Cooling Operation range 80 or less Heating °F (°C) 86 (30) or less ™ Remote controller type →ireless (→ired, Mobile app* [FGLair...

  • Page 9: Outdoor Unit

    1-2. Outdoor unit Type Inverter heat pump Model name AOUH18LMAS1 AOUH24LMAS1 Power supply 208/230 V ~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V Starting current Cooling 1,683 (2,860) 1,936 (3,290) Airflow rate CFM (m Heating 1,742 (2,960) 2,187 (3,715) Type ×...

  • Page 10: Dimensions

    2. Dimensions 2-1. Indoor unit ¢ Model: ASUH18LMAS 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) Ø3-1/8 (80)
  • Page 11  Installation space requirement Provide sufficient installation space for product safety. CAUTION Do not place any other electrical products or household belongings under the product. Condensa- tion dripping from the product might get them wet, and may cause damage or malfunction to the property.
  • Page 12 ¢ Model: ASUH24LMAS Unit: in (mm) 45-1/4 (1,150) 13-6/16 (340) 19 (483) 11 (280) 21-7/16 (544) 22-1/16 (560) 45-1/4 (1,150) 20-1/2 (520) 20-1/2 (520) 3-9/16 (90) 13/16 (20) Outline of unit 2-1/2 (64) 10/16 (16) 13-6/16 (340) 1-15/16 (50) 1-15/16 (50) 4-1/4 7/16 (11) 2-6/16 (61)
  • Page 13  Installation space requirement Provide sufficient installation space for product safety. CAUTION Do not place any other electrical products or household belongings under the product. Conden- sation dripping from the product might get them wet, and may cause damage or malfunction to the property.

  • Page 14: Outdoor Unit

    2-2. Outdoor unit ¢ Models: AOUH18LMAS1 and AOUH24LMAS1 Unit: in (mm) 5-13/16 25-9/16 (650) 5-5/8 (147) (143) 3-way valve (Gas) 3-way valve (Liquid) 1-1/4 (48) Liquid Top view Detail A Detail B 12-5/8 (320) 37 (940) 1-9/16 (40) 9/16 (14) 2-Ф7/8 (22) Cable port 2-Ф7/8 (22)
  • Page 15 2. TECHNICAL DATA AND PARTS LIST 2021.11.17 SR_CH02_AS052EF_04...
  • Page 16 4-1. Indoor unit ........................02-14 4-2. Outdoor unit........................02-16 5. Refrigerant system diagrams..............02-17 5-1. Models: AOUH18LMAS1 and AOUH24LMAS1............02-17 6. Wiring diagrams ..................02-18 6-1. Indoor unit ........................02-18 6-2. Outdoor unit........................02-19 7. PC board diagrams ...................02-20 7-1. Models: ASUH18LMAS and ASUH24LMAS..............02-20 7-2. Models: AOUH18LMAS1 and AOUH24LMAS1............02-21...

  • Page 17: Precautions

    • 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 18: Indoor Unit Parts List

    2. Indoor unit parts list 2-1. Model: ASUH18LMAS ¢ Exterior parts - (02-2) - 2-1. Model: ASUH18LMAS 2. Indoor unit parts list...
  • Page 19 Grille clamper R ♦ 9323341036 Under cover L ♦ 9333608006 Bush ♦ 9383730030 Louver spring ♦ — Front panel — — Panel cover — — Front panel B — - (02-3) - 2-1. Model: ASUH18LMAS 2. Indoor unit parts list...
  • Page 20 ¢ Chassis - (02-4) - 2-1. Model: ASUH18LMAS 2. Indoor unit parts list...
  • Page 21 (CN75 on Main PCB—→LAN adapter [option]) — Control box — — Control cover — — Display case — — Motor case — — Motor cover assy — — Pipe bracket — - (02-5) - 2-1. Model: ASUH18LMAS 2. Indoor unit parts list...

  • Page 22: Model: Asuh24Lmas

    2-2. Model: ASUH24LMAS ¢ Exterior parts - (02-6) - 2-2. Model: ASUH24LMAS 2. Indoor unit parts list...
  • Page 23 Item no. Part no. Part name Service part 9386990004 Bracket panel ♦ 9313951047 Conduit holder ♦ 9386958004 Louver U ♦ 9386959001 Louver Z ♦ 9383765063 →LAN adapter holder assy ♦ 9387074017 →ire cover assy ♦ 9315212016 Air clean filter assy ♦...
  • Page 24 ¢ Chassis - (02-8) - 2-2. Model: ASUH24LMAS 2. Indoor unit parts list...
  • Page 25 Item no. Part no. Part name Service part 9387064155 Evaporator total assy ♦ 9901013010 Terminal ♦ 9711732033 Main PCB ♦ 9316577008 Thermistor spring B ♦ 9900627027 Thermistor assy ♦ 9386988001 Room thermistor holder ♦ 9711146090 Display assy ♦ 9711147035 Indicator PCB ♦...

  • Page 26: Outdoor Unit Parts List

    3. Outdoor unit parts list 3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 ¢ Exterior parts and chassis - (02-10) - 3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 3. Outdoor unit parts list...
  • Page 27 Item no. Part no. Part name Service part 9383880001 Top panel assy ♦ 9383779008 Protective net ♦ 9375361013 Net rubber ♦ 313728262708 Thermistor spring A ♦ 9900984038 Thermistor (Heat exchanger temp.) ♦ 9900727154 Thermistor assy (Evaporator and Compressor temp.) ♦ 9383607004 Thermo holder ♦...
  • Page 28 ¢ Compressor - (02-12) - 3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 3. Outdoor unit parts list...
  • Page 29 Item no. Part no. Part name Service part 9380516064 Sound insulator (Top) ♦ 9379647243 Sound insulator (Body) ♦ 9900565091 Thermistor (Outdoor temp.) ♦ 9357804002 Thermostat holder ♦ 9900186029 Pressure switch ♦ 9374425723 4-way valve assy ♦ 9970194016 Solenoid ♦ 9383855115 Refrigerant volume adjustment unit ♦...

  • Page 30: Accessories

    4. Accessories 4-1. Indoor unit ¢ Model: ASUH18LMAS 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 Filter holder holder Cloth tape Air cleaning filters →all hook bracket - (02-14) - 4-1.
  • Page 31 ¢ Model: ASUH24LMAS Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Drain hose insulation Installation manual Cloth tape →all hook bracket Tapping screw (large) Remote controller Tapping screw (small) Battery Air cleaning filters Remote controller Filter holder holder - (02-15) - 4-1.

  • Page 32: Outdoor Unit

    4-2. Outdoor unit ¢ Models: AOUH18LMAS1 and AOUH24LMAS1 Part name Exterior Q’ty Part name Exterior Q’ty Installation manual Drain cap Drain pipe - (02-16) - 4-2. Outdoor unit 4. Accessories...

  • Page 33: Refrigerant System Diagrams

    5. Refrigerant system diagrams 5-1. Models: AOUH18LMAS1 and AOUH24LMAS1 Heat exchanger 3-way 3-way (INDOOR) valve valve Pressure switch 4-way valve Strainer Expansion valve Strainer Heat exchanger (OUTDOOR) : Cooling : Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Heat Exchanger Med temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat Exchanger Out temperature) : Thermistor (Pipe temperature)

  • Page 34: Wiring Diagrams

    6. Wiring diagrams 6-1. Indoor unit ¢ Models: ASUH18LMAS and ASUH24LMAS - (02-18) - 6-1. Indoor unit 6. →iring diagrams...

  • Page 35: Outdoor Unit

    6-2. Outdoor unit ¢ Models: AOUH18LMAS1 and AOUH24LMAS1 - (02-19) - 6-2. Outdoor unit 6. →iring diagrams...
  • Page 36 7. PC board diagrams 7-1. Models: ASUH18LMAS and ASUH24LMAS CONTROL UNIT 18 model: EZ-0200HHSE 24 model: EZ-0200KHSE TERMINAL OPTION UNIT (2-WIRE REMOTE CONTROLLER) AWG22 AWG22 BLACK REMOTE CN301 OUTDOOR UNIT CN14 CN300 AWG22 WHITE CONTROLLER AWG26 AWG22 CN13 B07B-PASK-1 POWER SOURCE WHITE B3 ( 5.0 ) B-XASK-1-A...
  • Page 37 7-2. Models: AOUH18LMAS1 and AOUH24LMAS1 INVERTER ASSEMBLY P700 Thermistor Characteristics. 18 model : EZ-02010HUE Temperature 32 ℉ 68 ℉ 86 ℉ Thermistor 24 model : EZ-02010HUE 15.83 k 5.90 k 3.78 k Thermistor ( Heatsink temp. ) 0.43 V 1.01 V 1.42 V DC5V-1 UL1015 AWG20 GREEN...
  • Page 38 - (02-22) - 7-2. Models: AOUH18LMAS1 and AOUH24LMAS1 7. PC board diagrams...
  • Page 39 3. TROUBLESHOOTING 2021.11.17 SR_CH03_AS052EF_01...
  • Page 40 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 1-4. Error code table (Outdoor unit) ..................03-4 1-5. Error code table (→ireless LAN indicator)...............03-6 1-6.
  • Page 41 CONTENTS (continued) 3. Troubleshooting without error code............03-52 3-1. Indoor unit—No power....................03-52 3-2. Outdoor unit—No power....................03-53 3-3. No operation (Power is on) ...................03-54 3-4. No cooling/No heating ....................03-55 3-5. Abnormal noise......................03-57 3-6. →ater leaking........................03-58 3-7. Too warm ........................03-59 3-8. Too cool........................03-63 4.

  • Page 43: Error Code

    1. Error code →hen a problem occurs in the system or the connected device, the error content is notified by dis- playing the code. NOTE: This function is only available in a system with indoor or IR receiver units equipped with LED lamps to indicate the error content.

  • Page 44: Error Code Table (Indoor Unit And Wired Remote Controller)

    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 45 Indoor unit display Wired remote Error contents Operation [ ] Timer [ ] Economy [ ] controller (Green) (Orange) (Green) display E: 95.↓. Compressor motor control error 9 times 5 times Continuous (Outdoor unit) E: 97.↓. Outdoor unit fan motor error 9 times 7 times Continuous...

  • Page 46: Error Code Table (Outdoor Unit)

    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)" in Chapter 5.
  • Page 47 PUMP LOW NOISE PEAK CUT POWER/ DOWN Error contents ERROR MODE E: 86.↓. Pressure sensor error (Outdoor ■ ● ■ ■ ○ ● ● ○ unit) ■ ● ■ ■ ○ ○ ○ ● E: 94.↓. Trip detection (Outdoor unit) E: 95.↓.

  • Page 48: Error Code Table (→Ireless Lan Indicator)

    1-5. Error code table (Wireless LAN indicator) • →ireless LAN control system diagram example Indoor unit Internet Controller PCB Cloud Wireless Parts: Mobile app Outdoor unit WLAN adapter (Smart device) router • Name of parts Wireless LAN adapter Wireless LAN label MAC: SSID: AP-WF PIN:...

  • Page 49: Error Code Table (Mobile App)

    1-6. Error code table (Mobile app) • Error display If there is an abnormality on the air conditioning, refer to as follows. →hen the (error button) on the home screen is tapped, error code and error name is displayed. – For Android Error button Error code Error Name...
  • Page 50 • Error code Error message Error contents Error code 11.1 Serial communication error E: 11.↓. Serial communication error (Serial (Serial Reverse Transfer Error) reverse transfer error) (Outdoor unit) 11.2 11.3 Serial communication error E: 11.↓. Serial communication error (Serial (Serial Forward Transfer Error) forward transfer error) (Indoor unit) 11.4 E: 12.↓.

  • Page 51: Error Message For Wireless Lan Control (Mobile App)

    1-7. Error message for wireless LAN control (Mobile app) • Error display If there is an abnormality on the wireless control system, refer to error messages as follows. The error message disappears after 5 seconds and the normal screen is displayed. For Android For iOS Error message...
  • Page 52 • Error message list – For Android Registration error Error message Cause Solution →i-Fi must be enabled to set The user has disabled →i-Fi Enable the →i-Fi on the smart device. up new device on the smart device. →e weren’t able to sign you The smart device and air Connect the mobile device to the same onto null.
  • Page 53 General error Error message Cause Solution No connectivity to →i-Fi or The smart device has no Connect the mobile device to the internet. the cloud. Please check your internet access. network connection. An error occurred while trying to update your profile. Please try again later.
  • Page 54 Registration error Error message Cause Solution Could not register the device. The router the air conditioner Check if the router connected to the air Make sure the device is is connected to, has no conditioner has internet access. (↔ou can ready for registration.

  • Page 55: Troubleshooting With Error Code

    2. Troubleshooting with error code 2-1. E: 11.X. Serial communication error (Serial reverse transfer error) (Outdoor unit) Operation indicator 1 time flash Timer indicator 1 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 11 outdoor unit Refer to "Error code table (Outdoor unit)"...
  • Page 56 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 57: E: 11.↓. Serial Communication Error (Serial Forward Transfer Error) (Indoor Unit)

    2-2. E: 11.X. Serial communication error (Serial forward transfer error) (Indoor unit) Operation indicator 1 time flash Timer indicator 1 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 11 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Main PCB →hen the indoor unit cannot receive the serial signal...
  • Page 58 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 59: E: 12.↓. →Ired Remote Controller Communication Error (Indoor Unit)

    2-3. E: 12.X. Wired remote controller communication error (Indoor unit) Operation indicator 1 time flash Timer indicator 2 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 12 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit Main PCB...

  • Page 60: E: 18.↓. External Communication Error (Indoor Unit)

    2-4. E: 18.X. External communication error (Indoor unit) Operation indicator 1 time flash Timer indicator 8 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 18 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 External After receiving a signal from the external input and Detective actuator...

  • Page 61: E: 23.↓. Combination Error (Outdoor Unit)

    2-5. E: 23.X. Combination error (Outdoor unit) Operation indicator 2 time flash Timer indicator 3 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 23 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 The outdoor unit receives the serial signal of applied Detective actuator Indoor unit...

  • Page 62: E: 26.↓. Address Setting Error In Wired Remote Controller (Indoor Unit)

    2-6. E: 26.X. Address setting error in wired remote controller (Indoor unit) Operation indicator 2 time flash Timer indicator 6 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 26 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →ired remote controller (2-wire) •...

  • Page 63: E: 29.↓. Connected Unit Number Error (Indoor Unit)

    2-7. E: 29.X. Connected unit number error (Indoor unit) Operation indicator 2 time flash Timer indicator 9 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 29 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →ired remote controller (2-wire) →hen the number of the connected indoor unit exceeds Detective actuator...

  • Page 64: E: 32.↓. Indoor Unit Main Pcb Error (Indoor Unit)

    2-8. E: 32.X. Indoor unit main PCB error (Indoor unit) Operation indicator 3 time flash Timer indicator 2 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 32 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →hen power is on and there is some below case.

  • Page 65: E: 35.↓. Manual Auto Button Error (Indoor Unit)

    2-9. E: 35.X. MANUAL AUTO button error (Indoor unit) Operation indicator 3 time flash Timer indicator 5 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 35 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit controller PCB →hen the MANUAL AUTO button becomes on for Detective actuator...

  • Page 66: E: 3A.↓. Indoor Unit Communication Circuit Error (Indoor Unit)

    2-10. E: 3A.X. Indoor unit communication circuit error (Indoor unit) Operation indicator 3 time flash Timer indicator 10 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 3A outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →ired remote controller (2-wire) →hen the indoor unit detects the configuration of remote...
  • Page 67 Depending on the connected remote controller type, following setting is required: Connected remote controller DIP switch Jumper (JM9) 2-wire type 2WIRE/3WIRE Disconnected Factory setting: 2WIRE 3-wire type 2WIRE/3WIRE Connected Factory setting: 3WIRE (Factory setting) • 2-wire type remote main PCB If the communication PCB is not connected and JM9 is disconnected, 3A error is displayed.

  • Page 68: E: 41.↓. Room Temperature Sensor Error (Indoor Unit)

    2-11. E: 41.X. Room temperature sensor error (Indoor unit) Operation indicator 4 time flash Timer indicator 1 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 41 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB Room temperature thermistor is open or short is Detective actuator...

  • Page 69: E: 42.↓. Indoor Unit Heat Exchanger Sensor Error (Indoor Unit)

    2-12. E: 42.X. Indoor unit heat exchanger sensor error (Indoor unit) Operation indicator 4 time flash Timer indicator 2 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 42 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB →hen heat exchanger temperature thermistor open or...

  • Page 70: E: 51.↓. Indoor Unit Fan Motor Error (Indoor Unit)

    2-13. E: 51.X. Indoor unit fan motor error (Indoor unit) Operation indicator 5 time flash Timer indicator 1 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 51 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 main PCB →hen the actual rotation number of the indoor unit fan...

  • Page 71: E: 58.↓. Intake Grille Error (Indoor Unit)

    2-14. E: 58.X. Intake grille error (Indoor unit) Operation indicator 5 time flash Timer indicator 8 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 58 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB →hen the Micro switch is detected open while running Detective actuator...

  • Page 72: E: 62.↓. Outdoor Unit Main Pcb Error (Outdoor Unit)

    2-15. E: 62.X. Outdoor unit main PCB error (Outdoor unit) Operation indicator 6 time flash Timer indicator 2 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 62 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Access to EEPROM failed due to some cause after Detective actuator...

  • Page 73: E: 63.↓. Inverter Error (Outdoor Unit)

    2-16. E: 63.X. Inverter error (Outdoor unit) Operation indicator 6 time flash Timer indicator 3 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 63 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Detective actuator Outdoor unit Inverter PCB...

  • Page 74: E: 64.↓. Pfc Circuit Error (Outdoor Unit)

    2-17. E: 64.X. PFC circuit error (Outdoor unit) Operation indicator 6 time flash Timer indicator 4 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 64 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 •...

  • Page 75: E: 65.↓. Trip Terminal L Error (Outdoor Unit)

    2-18. E: 65.X. Trip terminal L error (Outdoor unit) Operation indicator 6 time flash Timer indicator 5 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 65 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →hen the signal from FO terminal of IPM is “L”...

  • Page 76: E: 71.↓. Discharge Thermistor Error (Outdoor Unit)

    2-19. E: 71.X. Discharge thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 1 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 71 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB →hen discharge pipe temperature thermistor open or Detective actuator...

  • Page 77: E: 73.↓. Heat Exchanger (Middle/Outlet) Temperature Thermistor Error (Outdoor Unit)

    2-20. E: 73.X. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 3 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 73 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Heat exchanger liquid temperature •...

  • Page 78: E: 74.↓. Outdoor Temperature Thermistor Error (Outdoor Unit)

    2-21. E: 74.X. Outdoor temperature thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 4 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 74 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB →hen outdoor temperature thermistor open or short Detective actuator...

  • Page 79: E: 77.↓. Heat Sink Thermistor Error (Outdoor Unit)

    2-22. E: 77.X. Heat sink thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 7 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 77 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Detective actuator Heat sink temperature thermistor Heat sink temperature thermistor short or open detected...

  • Page 80: E: 84.↓. Current Sensor Error (Outdoor Unit)

    2-23. E: 84.X. Current sensor error (Outdoor unit) Operation indicator 8 time flash Timer indicator 4 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 84 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →hen input current sensor has detected 0 A, while inverter compressor is operating at higher than 56 rps, Detective actuator...

  • Page 81: E: 86.↓. High Pressure Switch Error (Outdoor Unit)

    2-24. E: 86.X. High pressure switch error (Outdoor unit) Operation indicator 8 time flash Timer indicator 6 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 86 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB →hen pressure switch open is detected in 10 seconds Detective actuator...

  • Page 82: E: 86.↓. Pressure Sensor Error (Outdoor Unit)

    2-25. E: 86.X. Pressure sensor error (Outdoor unit) Operation indicator 8 time flash Timer indicator 6 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 86 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB 30 seconds or more after power-on, when pressure sensor detection value detects the condition below...

  • Page 83: E: 94.↓. Trip Detection (Outdoor Unit)

    2-26. E: 94.X. Trip detection (Outdoor unit) Operation indicator 9 time flash Timer indicator 4 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 94 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Inverter PCB Protection stop by over-current generation after inverter compressor start processing completed generated...

  • Page 84: E: 95.↓. Compressor Motor Control Error (Outdoor Unit)

    2-27. E: 95.X. Compressor motor control error (Outdoor unit) Operation indicator 9 time flash Timer indicator 5 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 95 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Inverter PCB 1.

  • Page 85: E: 97.↓. Outdoor Unit Fan Motor Error (Outdoor Unit)

    2-28. E: 97.X. Outdoor unit fan motor error (Outdoor unit) Operation indicator 9 time flash Timer indicator 7 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 97 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Inverter PCB 1.
  • Page 86 Check point 4. Check output voltage of inverter PCB Check outdoor unit circuit diagram and the voltage. (Measure at inverter PCB side connector) FAN MOTOR BLACK WHITE YELLOW BROWN NOTE: For details of wiring diagram, refer to "→iring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-18.

  • Page 87: E: 99.↓. 4-Way Valve Error (Outdoor Unit)

    2-29. E: 99.X. 4-way valve error (Outdoor unit) Operation indicator 9 time flash Timer indicator 9 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 99 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB →hen the indoor heat exchanger temperature is...
  • Page 88 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 03-80. • Solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.97 kΩ. If it is open or abnormal resistance value, replace solenoid coil.
  • Page 89 2-30. E: A1.X. Discharge temperature error (Outdoor unit) Operation indicator 10 time flash Timer indicator 1 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: A1 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB Protection stop by discharge temperature ≥...

  • Page 90: E: A1.↓. Discharge Temperature Error (Outdoor Unit)

    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. - (03-48) - 2-30. E: A1.↓. Discharge temperature error (Outdoor unit) 2.
  • Page 91 2-31. E: A5.X. Low pressure error (Outdoor unit) Operation indicator 10 time flash Timer indicator 5 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: A5 outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB Protection stop by suction pressure ≥...

  • Page 92: E: A5.↓. Low Pressure Error (Outdoor Unit)

    Check point 6. Check the refrigerant amount Check the refrigerant leakage. Check point 7. Replace main PCB If check point 1 to 6 do not improve the symptom, replace the main PCB. - (03-50) - 2-31. E: A5.↓. Low pressure error (Outdoor unit) 2.

  • Page 93: E: Ac.↓. Heat Sink Temperature Error (Outdoor Unit)

    2-32. E: AC.X. Heat sink temperature error (Outdoor unit) Operation indicator 10 time flash Timer indicator 12 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: AC outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit inverter PCB Protection stop by heat sink temperature ≥...

  • Page 94: Troubleshooting Without Error Code

    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 95: Outdoor Unit-No Power

    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 96: No Operation (Power Is On)

    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 97: No Cooling/No Heating

    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 98 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 99: Abnormal Noise

    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 100: Ater Leaking

    3-6. Water leaking Erroneous installation Forecast of cause Drain hose failure Diagnosis method when water is spitting Diagnosis method when water leak occurs • Is main unit installed in stable condi- tion? Is the filter clogged? • Is main unit broken or deformed at the time of transportation or maintenance? MPa MPa •...

  • Page 101: Too Warm

    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? If no, go to "Check Point...
  • Page 102 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. (Room Temperature Control for indoor unit sensor) NOTE: For details of function setting number 31, refer to "Function settings "...
  • Page 103 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. Location of the remote controller Move the remote controller.
  • Page 104 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 →ORKING on page 05-1. Check point 9-2. Check the effects of function setting change Did this function setting improve temperature control? If the space is still too warm, go to "Check point...

  • Page 105: Too Cool

    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? If no, go to "Check Point...
  • Page 106 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. (Room Temperature Control for indoor unit sensor) NOTE: For details of function setting number 30, refer to "Function settings "...
  • Page 107 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. Location of the remote controller Move the remote controller.
  • Page 108 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 →ORKING on page 05-1. Check point 9-2. Check the effects of function setting change Did this function setting improve temperature control? If the space is still too cool, go to "Check point...

  • Page 109: Troubleshooting With Error Code (For Wireless Lan Adapter)

    4. Troubleshooting with error code (For wireless LAN adapter) 4-1. E: 18.X. External communication error between indoor unit and WLAN adapter Operation indicator 1 time flash Timer indicator 8 time flash Indoor unit Economy indicator Continuous flash Indicator Error code E: 18 LED1 (green) Flashing fast...

  • Page 110: Ireless Lan Adapter Error

    4-2. Wireless LAN adapter error Operation indicator No indication Timer indicator No indication Indoor unit Economy indicator No indication Indicator Error code — LED1 (green) Flashing fast →ireless LAN adapter LED2 (orange) Flashing fast →ireless LAN adapter setting →hen the setting button becomes on for consecutive 60 button seconds or more.

  • Page 111: Network Communication Error Between Wireless Lan Router And →Lan Adapter

    4-3. Network communication error between wireless LAN router and WLAN adapter Operation indicator No indication Timer indicator No indication Indoor unit Economy indicator No indication Indicator Error code — LED1 (green) →ireless LAN adapter LED2 (orange) Flashing fast →ireless LAN router →hen the not connection between wireless LAN adapter and wireless LAN router.
  • Page 112 Check point 4. Replace wireless LAN adapter. If check point 3 do not improve the symptom, replace the wireless LAN adapter and cancel the reg- istration of air conditioner on the mobile app. After replacing the adapter, perform the pairing on the mobile app. For the method of the mobile app, refer to "Mobile app setting method"...
  • Page 113 4-4. E: 18.X. Communication error Operation indicator 1 time flash Timer indicator 8 time flash Indoor unit Economy indicator Continuous flash Indicator Error code E: 18 LED1 (green) Flashing fast →ireless LAN adapter LED2 (orange) Flashing fast →ireless LAN router →hen the external communication error between indoor unit and →LAN adapter and network communication →ireless LAN adapter PCB...

  • Page 114: E: 18.↓. Communication Error

    Check point 3-1. Turn on the power again of air conditioner. If check point 1 to 2 do not improve the symptom, turn on the power of the air conditioner again and wait for 60 seconds. -> →hen the flashing pattern of the LED 2 (orange) is on, go to "Check point 3-2".

  • Page 115: E: 18.↓. →Ireless Lan Adapter Non-Energized

    4-5. E: 18.X. Wireless LAN adapter non-energized Operation indicator 1 time flash Timer indicator 8 time flash Indoor unit Economy indicator Continuous flash Indicator Error code E: 18 LED1 (green) →ireless LAN adapter LED2 (orange) Indoor unit controller PCB →hen the voltage (DC 12 V) does not output from the Detective actuator controller PCB.

  • Page 116: Ireless Lan Adapter Sleep Mode (Indoor Unit)

    4-6. Wireless LAN adapter Sleep mode (Indoor unit) Operation indicator No indication Timer indicator No indication Indoor unit Economy indicator No indication Indicator Error code — LED1 (green) →ireless LAN adapter LED2 (orange) →hen the state in which fly a wireless(SSID) have Detective actuator Sleep mode passed 1 hour.

  • Page 117: Mobile App Setting Method

    4-7. Mobile app setting method ¢ Air conditioner deregistration method →hen the wireless LAN adapter is replaced, deregistration of all air conditioner is necessary on the mobile app. Launch the mobile app. FGL air Press and hold the registered device name of the air conditioner. If the Unregister button is displayed, tap the button.
  • Page 118 ¢ Air conditioner registration pairing method Choose the following modes to connect the air conditioner to the wireless LAN router. NOTES: • Before starting this setting, wait for 60 seconds or more after the power supply is connected to the air conditioner (via breaker or plug). •...
  • Page 119 Confirm LED 2 is flashing (On/Off at 2 seconds intervals). Then press and hold the setting but- ton on the wireless LAN adapter for 3 seconds. on/off: 2 sec/2 sec on/off: 2 sec/0.5 sec LED 2 lighting will change. (On/Off: 2 sec./2 sec. 2 sec./0.5 sec.) Confirm both of the LED 1 and 2 are on to proceed.
  • Page 120  Manual mode (For Android) Launch the mobile app. FGL air Sign in with your E-mail address and password following the screen on the mobile app. [email protected] Sign in Press the + button to add a new air conditioner. Select manual mode. Button mode Manual mode If both of the LED 1 and 2 are off, push the setting button once.
  • Page 121  Manual mode (For iOS) Launch the mobile app. FGL air Sign in with your E-mail address and password following the screen on the mobile app. [email protected] Sign in Press the + button to add a new air conditioner. Select manual mode. Button mode Manual mode If both of the LED 1 and 2 are off, push the setting button once.

  • Page 122: Service Parts Information

    5. Service parts information 5-1. 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 123: Inverter Compressor

    5-2. 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 W400(U) W401(V) W402(W) BLACK WHITE...

  • Page 124: Outdoor Unit Electronic Expansion Valve (Eev)

    5-3. 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 "→iring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-18. Check point 2.
  • Page 125 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 126: Indoor Unit Fan Motor

    5-4. 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. Check resistance of indoor fan motor Refer to below.

  • Page 127: Outdoor Unit Fan Motor

    5-5. 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. Check resistance of outdoor fan motor Refer to below.

  • Page 128: Pressure Switch

    5-6. 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 18/24 model: P770 - (03-86) - 5-6. Pressure switch 5. Service parts information...

  • Page 129: 4-Way Valve Coil (Solenoid Coil)/4-Way Valve

    5-7. 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 130: Thermistor Resistance Values

    6. Thermistor resistance values 6-1. 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 131: Outdoor Unit

    6-2. Outdoor unit ¢ Discharge 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)
  • Page 132 ¢ 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 133 ¢ Heat exchanger temperature thermistor Temperature °F (°C) Resistance (kΩ) Voltage (V) -22.0 (-30.0) 95.57 0.24 -12.0 (-25.0) 68.89 0.32 -4.0 (-20.0) 50.31 0.43 5.0 (-15.0) 37.19 0.57 14.0 (-10.0) 27.81 0.73 23.0 (-5.0) 21.02 0.92 32.0 (0.0) 16.05 1.14 41.0 (5.0) 12.38 1.39...
  • Page 134 ¢ Outdoor temperature thermistor Temperature °F (°C) Resistance (kΩ) Voltage (V) -22.0 (-30.0) 224.33 0.73 -12.0 (-25.0) 159.71 0.97 -4.0 (-20.0) 115.24 1.25 5.0 (-15.0) 84.21 1.56 14.0 (-10.0) 62.28 1.90 23.0 (-5.0) 46.58 2.26 32.0 (0.0) 35.21 2.61 41.0 (5.0) 26.88 2.94 50.0 (10.0)
  • Page 135 4. CONTROL AND FUNCTIONS 2021.11.17 SR_CH04_AS052EF_01...
  • Page 136 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 ........................04-3 1-4. Rotation number of compressor at normal start-up ............04-4 1-5. Rotation number of compressor limitation by outdoor temperature ........04-5 2.
  • Page 137 CONTENTS (continued) 8-6. Low outdoor temperature protection................04-33 8-7. High temperature and high pressure release control ............04-33...

  • Page 139: 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 of compressor range Unit: rps Model name Minimum frequency Maximum frequency ASUH18LMAS ASUH24LMAS - (04-1) - 1-1. Cooling operation 1. Rotation number control of compressor...
  • Page 140 F zone Unit: rps Indoor unit fan mode Outdoor Model name temperature zone HIGH QUIET A zone B zone C zone ASUH18LMAS D zone E zone F zone A zone B zone C zone ASUH24LMAS D zone E zone F zone - (04-2) - 1-1.

  • Page 141: Heating Operation

    Unit: rps Model name Minimum frequency Maximum frequency ASUH18LMAS ASUH24LMAS 1-3. Dry operation The rotation number of compressor shall change according to the temperature, set temperature, and room temperature variation which the room temperature sensor of the indoor unit has detected as shown in the table below.

  • Page 142: 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 VI Frequency V Frequency IV Frequency III Frequency II Frequency I Time 1 Time 2 Time 3 Time 4 Time 5 Time 6 Frequency (rps) Time (sec) - (04-4) -...

  • Page 143: 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 107.6°F (42°C) J zone 100.4°F (38°C) I zone 87.8°F (31°C) H zone 69.8°F (21°C) G zone 55.4°F...
  • Page 144 • Heating mode G zone 68.0°F (20°C) F zone 44.6°F (7°C) E zone 35.6°F (2°C) D zone 19.4°F (-7°C) C zone 14.0°F (-10°C) B zone 5.0°F (-15°C) A zone Limitation of compressor Model name Outdoor temperature zone frequency A zone 71 rps B zone 53 rps...

  • Page 145: Auto Changeover Operation

    2. Auto changeover operation →hen the air conditioner is set to AUTO mode by remote controller, operation starts in the optimum mode from among heating, cooling, dry and monitoring modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set be- tween 64.4°F (18°C) and 86.0°F (30°C) in 1.8°F (1.0°C) steps.
  • Page 146 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 147: 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 AOUH18LMAS1 AOUH24LMAS1 PO→ERFUL 1,490 1,280 HIGH 1,390 1,180 MED+ 1,320 1,040 1,210 Heating LO→...
  • Page 148 ¢ Dry operation During dry operation, fan speed setting can not be changed as shown in “Fan speed” above. ¢ Heating operation Switch the airflow AUTO, and the indoor fan motor will run according to a room temperature, as be- low.
  • Page 149 • 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 150: 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  AOUH18LMAS1 Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry...
  • Page 151  AOUH24LMAS1 Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry Heating — — — S-HIGH — • →hen the compressor frequency increases, the outdoor fan speed also changes to the higher speed.

  • Page 152: Louver Control

    Each time the button is pressed, the air direction range will change as below: Side view • Remote controller display is not changed. • Vertical airflow direction is set automatically as shown, in accordance with the type of operation selected. Operation mode ASUH18LMAS ASUH24LMAS Cooling/Dry Horizontal flow 1 Heating Downward flow 6 Downward flow 5 •...

  • Page 153: Swing Operation

    4-3. Swing operation • To select vertical airflow swing operation →hen the swing signal is received, the vertical airflow direction louver starts to swing. – Swinging range • Cooling mode/dry mode/fan mode (1 to 3): 1 • Heating mode/fan mode (4 to 6): 3 –...

  • Page 154: 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: →hen the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 155 ¢ 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 156: Ired Remote Control

    5-2. Wired remote control Temperature set On/Off timer Program timer Sleep timer Weekly timer back timer ○ ○ ○ ○ ○ ¢ On/Off timer • Off timer: →hen the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 157 ¢ 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 158 ¢ 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 159: 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 160: 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 161: Various Control

    7. Various control 7-1. Auto restart →hen the power was interrupted by a power failure etc. during operation, the operation contents at that time are memorized and when the power is recovered, operation is automatically started with the memorized operation contents. Operation contents memorized when the power is interrupted Operation mode Setting temperature...

  • Page 162: Forced Cooling Operation

    7-3. Forced cooling operation The outdoor unit may not operate depending on the room temperature. →hen FORCED COOLING OPERATION button is pressed more than 10 seconds, forced cooling operation starts as shown in the table below. Operation mode Auto changeover Fan mode AUTO Timer mode...

  • Page 163: Po→Erful Operation

    7-6. POWERFUL operation The PO→ERFUL operation starts by pressing PO→ERFUL button on the remote controller. The indoor unit and outdoor unit operate at maximum power as shown in the table below. ASUH18LMAS ASUH24LMAS Compressor frequency Maximum Fan mode PO→ERFUL Cooling...

  • Page 164: External Electrical Heater Control

    7-9. External electrical heater control The external electrical heater is operated as below. When the room Ts: Setting temperature temperature rises Heater : Off -1.8°F (Ts -1°C) -5.4°F (Ts -3°C) Heater : On -18.0°F (Ts -10°C) -21.6°F (Ts -12°C) Heater : Off When the room temperature drops NOTES:...

  • Page 165: Peak Cut Operation

    7-13. Peak cut operation The current value is limited to reduce the power consumption by external input. Peak cut level Level 1 Level 2 Level 3 Level 4 Forced thermostat Peak cut for rated capacity 100% NOTES: • During defrost operation, peak cut operation becomes invalid. •...
  • Page 166 Available Sensor ID Sensor ID Item Unit Remarks Limit switch 3 (For left filter) On/Off 08: On/Off 0: Off, 1: On Current sensor 09: A Indoor unit total energized hours 11: h Total filtering hours 11: h Indoor unit fan total operation hours 11: h Indoor unit fan 2 total operation hours 11: h...
  • Page 167 Available Sensor ID Sensor ID Item Unit Remarks 0: Off, 1: On External heater 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 Heating operation status (External NOTE: The value is output even if 00: —...
  • Page 168 Available Sensor ID Sensor ID Item Unit Remarks Base heater output On/Off 08: On/Off 0: Off, 1: On Belt heater output On/Off 08: On/Off 0: Off, 1: On Operating current 09: A Outdoor unit total power-on hours 11: h Compressor total heating operation 11: h hours Compressor total cooling operation...

  • Page 169: 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. • →hen the discharge temperature becomes higher than the trigger condition, the compressor fre- quency is decreased as the table below, and it continues to decrease until the discharge tempera- ture becomes lower than the trigger condition.

  • Page 170: 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 171 8-6. Low outdoor temperature protection →hen the outdoor temperature sensor detects lower than the trigger condition below, the compres- sor is stopped. Operation mode Cooling/Dry Trigger condition -4°F (-20°C) Release condition 5°F (-15°C) 8-7. High temperature and high pressure release control The compressor is controlled as follows.
  • Page 172 - (04-34) - 8-7. High temperature and high pressure release control 8. Various protections...
  • Page 173 5. FILED WORKING 2021.11.17 SR_CH05_AS052EF_01...
  • Page 174 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 1-3. Switching the temperature unit of remote controller............05-11 2. External input and output.................05-12 2-1. External input........................05-13 2-2.

  • Page 175: 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 176 NOTES: • The air conditioner custom code is set to prior to shipment. • If you do not know the air conditioner custom code setting, try each of the custom codes ( ) until you find the code that operates the air conditioner. - (05-2) - 1-1.
  • Page 177 ¢ 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 178 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 179 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 180 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 181 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 182 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 183 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 184: Custom Code Setting For Wireless Remote Controller

    1-2. 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 185: Switching The Temperature Unit Of Remote Controller

    1-3. Switching the temperature unit of remote controller Displayed temperature unit on the remote controller LCD can be switched between °F (Fahrenheit) and °C (Celsius). To change temperature unit, do as follows: Press the TEMP. (Up) button ( ) for at least 5 seconds to display the current temperature unit. (Factory setting: °F) Press the TEMP.

  • Page 186: 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 —...

  • Page 187: External Input

    2-1. External input →ith 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 (22A→G) should be used. Maximum length of cable is 492 ft (150 m). •...
  • Page 188 ¢ 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 189: 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 (22A→G) should be used. Maximum length of cable is 82 ft (25 m). •...
  • Page 190 ¢ External input and output PCB • A twisted pair cable (22A→G) 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 191: 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 192 External output Indoor unit External input and output PCB Function Rotary Mode setting CN47 CN310 CN311 CN312 Indoor unit fan 60-00 Operation/Stop Operation/Stop Error status operation status Indoor unit fan External heater 60-00 Operation/Stop Error status operation status output Cooling Indoor unit fan External heater 60-01...

  • Page 193: 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 Operation External input and 46-00 CN313 output PCB...
  • Page 194 • 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 Forced stop External input and 46-02 CN313 output PCB Normal CN313 Forced stop Normal...
  • Page 195 • 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 Operation External input and 46-03 CN313 Stop (R.C. output PCB disabled) CN313 Operation...
  • Page 196 • Forced thermostat off function Rotary SW on Input Function setting / External input External input Command signal and output PCB 60-00 / 2 Thermostat 60-09 / B External input and 60-10 / C CN313 output PCB Normal 60-11 / D operation 60-12 / D Input...
  • Page 197 • Error status Rotary SW on Output Function setting / External input External output Command signal and output PCB Error 60-09 / B Output of indoor unit CN47 Normal Error 60-00 / 2 CN310 Normal 60-00 / 1 Error External input and 60-09 / B CN311 output PCB...
  • Page 198 • External heater output Rotary SW on Output Function setting / External input External output Command signal and output PCB Heater on 60-11 / D Output of indoor unit CN47 Heater off 60-00 / 2 Heater on External input and 60-09 / B CN312 output PCB...
  • Page 199 ¢ 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 200 • 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 201  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 202  Auxiliary heater control by outdoor temperature 1 This control selects heat pump or external heater according to the outdoor temperature. →hen 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 203 • 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 204  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 205 • 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 206  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 207 • 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 208  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 209  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 210 • 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 211  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 212 • 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 213  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 214 • 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 215 ¢ 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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