Fujitsu ARUH18LUAS Service Manual
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Fujitsu ARUH18LUAS Service Manual

Fujitsu ARUH18LUAS Service Manual

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AIR CONDITIONER
Duct type
INDOOR
OUTDOOR
SERVICE MANUAL
ARUH18LUAS
ARUH24LUAS
ARUH30LUAS
AOUH18LUAS1
ARUH36LUAS
AOUH24LUAS1
AOUH30LUAS1
AOUH36LUAS1
SR_AR056EF_02
2023.04.25

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Summary of Contents for Fujitsu ARUH18LUAS

  • Page 1 AIR CONDITIONER Duct type SERVICE MANUAL INDOOR ARUH18LUAS ARUH36LUAS ARUH24LUAS ARUH30LUAS OUTDOOR AOUH18LUAS1 AOUH24LUAS1 AOUH30LUAS1 AOUH36LUAS1 SR_AR056EF_02 2023.04.25...
  • Page 2 Mobile” is a trademark of FUJITSU GENERAL LIMITED. ™ Google Play is trademark of Google LLC. ® App Store is a service mark of Apple Inc., registered in the U.S. and other countries. Copyright © 2023 Fujitsu General Limited. All rights reserved.
  • 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 2023.04.25 SR_CH01_AR056EF_02...
  • Page 6 CONTENTS 1. GENERAL INFORMATION 1. Specifications....................01-1 1-1. Indoor unit ........................01-1 1-2. Outdoor unit........................01-5 2. Dimensions....................01-7 2-1. Indoor unit ........................01-7 2-2. Outdoor unit........................01-11...
  • Page 7 1. Specifications 1-1. Indoor unit Duct Type Inverter, Heat pump Model name ARUH18LUAS ARUH24LUAS ARUH30LUAS Power supply intake Outdoor unit Voltage 208/230 System power supply Frequency Available voltage range 187—253 Indoor unit power supply (from outdoor unit) 208/230 k→ 5.02 7.03...
  • Page 8 Duct Type Inverter, Heat pump Model name ARUH18LUAS ARUH24LUAS ARUH30LUAS NOTES: • Specifications are based on the following conditions: – Cooling: Indoor temperature of 80°FDB/67°F→B (26.67°CDB/19.44°C→B), and outdoor temperature of 95°FDB/75°F→B (35°CDB/23.9°C→B). – Heating: Indoor temperature of 70°FDB/60°F→B (21.11°CDB/15.56°C→B), and outdoor temperature of 47°FDB/43°F→B (8.33°CDB/6.11°C→B).
  • Page 9 Duct Type Inverter, Heat pump Model name ARUH36LUAS Power supply intake Outdoor unit Voltage 208/230 System power supply Frequency Available voltage range 187—253 Indoor unit power supply (from outdoor unit) 208/230 k→ 10.55 Rated Btu/h 36,000 Cooling k→ 2.81—11.43 Min.—Max. Btu/h 9,600—39,000 k→...
  • Page 10 Duct Type Inverter, Heat pump Model name ARUH36LUAS NOTES: • Specifications are based on the following conditions: – Cooling: Indoor temperature of 80°FDB/67°F→B (26.67°CDB/19.44°C→B), and outdoor temperature of 95°FDB/75°F→B (35°CDB/23.9°C→B). – Heating: Indoor temperature of 70°FDB/60°F→B (21.11°CDB/15.56°C→B), and outdoor temperature of 47°FDB/43°F→B (8.33°CDB/6.11°C→B). –...
  • Page 11 1-2. Outdoor unit Type Inverter, Heat pump Model name AOUH18LUAS1 AOUH24LUAS1 Power supply 208/230 V~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V Starting current 10.3 Cooling 1,395 (2,370) 2,187 (3,715) Airflow rate CFM (m Heating 1,460 (2,480) 2,187 (3,715) Type ×...
  • Page 12 Type Inverter, Heat pump Model name AOUH30LUAS1 AOUH36LUAS1 Power supply 208/230 V~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V Starting current 13.4 16.5 Cooling 2,301 (3,910) 2,502 (4,250) Airflow rate CFM (m Heating 2,219 (3,770) 2,431 (4,130) Type ×...
  • Page 13 2. Dimensions 2-1. Indoor unit ¢ Models: ARUH18LUAS, ARUH24LUAS, and ARUH30LUAS Unit: in (mm) Rear view 40-15/16 (1,040) 2-1/16 11-13/16 (53) 35-1/4 (895) (300) P3-15/16 × 8 = 31-1/2 1-7/8 5-7/8 2-15/16 (47) 7-1/2 (P100 × 8 = 800) (150) (75) Ø4-15/16...
  • Page 14 ¢ Model: ARUH36LUAS Unit: in (mm) Rear view 56-11/16 (1,440) 2-1/16 11-13/16 51 (1,295) (53) (300) P3-15/16 × 12 = 47-1/4 1-7/8 2-15/16 5-7/8 (47) (P100 × 12 = 1,200) 7-1/2 (75) (150) Ø4-15/16 (190) (Ø125) Control Ø3/16 pipe (Ø4) Liquid Drain pipe...
  • Page 15 ¢ Installation space requirement Provide sufficient installation space for product safety. NOTE: The detailed component shape depends on the model.  Models: ARUH18LUAS, ARUH24LUAS, ARUH30LUAS, and ARUH36LUAS Unit: in (mm) 1 (20) or more 6 (150) 12 (300) or more...
  • Page 16 NOTES: • Do not place any wiring or illumination in the maintenance space, as they will impede service. • The detailed component shape depends on the model.  Models: ARUH18LUAS, ARUH24LUAS, ARUH30LUAS, and ARUH36LUAS Unit: in (mm) • Provide a maintenance access for maintenance purposes.
  • Page 17 2-2. Outdoor unit ¢ Model: AOUH18LUAS1 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 Hole...
  • Page 18 ¢ Model: AOUH24LUAS1 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) Cable port 2-Ф1/8 (28) Cable port...
  • Page 19 ¢ Models: AOUH30LUAS1 and AOUH36LUAS1 Unit: in (mm) 5-13/16 5-5/8 (147) 25-9/16 (650) (143) 1-7/8 (48) 1-3/8 (35.7) Top view 37 (940) 1-9/16 12-5/8 (320) 3/16 (40) 3-way valve (Liquid) 3-way valve (Gas) 2-Ф7/8 (22) 2-Ф7/8 (22) Cable port Cable port 2-Ф1/8 (28) Cable port 2-Ф1/8 (28)
  • Page 20 - (01-14) - 2-2. Outdoor unit 2. Dimensions...
  • Page 21 2. TECHNICAL DATA AND PARTS LIST 2023.04.25 SR_CH02_AR056EF_02...
  • Page 22 CONTENTS 2. TECHNICAL DATA AND PARTS LIST 1. Precautions....................02-1 2. Indoor unit parts list..................02-2 2-1. Models: ARUH18LUAS, ARUH24LUAS, and ARUH30LUAS.........02-2 2-2. Model: ARUH36LUAS ....................02-4 3. Outdoor unit parts list.................02-6 3-1. Model: AOUH18LUAS1 ....................02-6 3-2. Model: AOUH24LUAS1 ....................02-10 3-3. Models: AOUH30LUAS1 and AOUH36LUAS1.............02-14 4.
  • Page 23 • 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 24 2. Indoor unit parts list 2-1. Models: ARUH18LUAS, ARUH24LUAS, and ARUH30LUAS ¢ Chassis - (02-2) - 2-1. Models: ARUH18LUAS, ARUH24LUAS, and ARUH30LUAS 2. Indoor unit parts list...
  • Page 25 →ire with connector (CN66 on Main PCB—CN410 on — 9710260001 ♦ Power supply PCB) →ire with connector (→hite) (CN302 on Power supply — 9710161018 ♦ PCB—Reactor assy) — Control box assy — - (02-3) - 2-1. Models: ARUH18LUAS, ARUH24LUAS, and ARUH30LUAS 2. Indoor unit parts list...
  • Page 26 2-2. Model: ARUH36LUAS ¢ Chassis - (02-4) - 2-2. Model: ARUH36LUAS 2. Indoor unit parts list...
  • Page 27 Item no. Part no. Part name Service part 9381748099 Top panel sub assy ♦ 9603480011 DC fan motor ♦ 9383695001 Sirocco fan assy ♦ 9381829033 Casing sub assy ♦ 9381597000 Motor band assy ♦ 9382384005 Motor bracket assy ♦ 9900898014 Reactor assy ♦...
  • Page 28 3. Outdoor unit parts list 3-1. Model: AOUH18LUAS1 ¢ Exterior parts and chassis - (02-6) - 3-1. Model: AOUH18LUAS1 3. Outdoor unit parts list...
  • Page 29 Item no. Part no. Part name Service part 9323834330 Heat exchanger unit ♦ 9377854001 Protective net assy ♦ 9322556028 Top panel assy ♦ 9322327000 Thermistor holder ♦ 9900984014 Thermistor (Heat exchanger) ♦ 9900935054 Thermistor assy (Discharge temp.) ♦ 9709688427 Main PCB ♦...
  • Page 30 ¢ Compressor - (02-8) - 3-1. Model: AOUH18LUAS1 3. Outdoor unit parts list...
  • Page 31 Item no. Part no. Part name Service part 9323825215 Compressor unit ♦ 9322446015 4-way valve assy ♦ 9970194023 Solenoid ♦ 9970222016 Expansion valve coil ♦ 9322463029 Pulse motor valve assy ♦ 9322474001 2-way valve assy ♦ 9387831016 3-way valve assy ♦...
  • Page 32 3-2. Model: AOUH24LUAS1 ¢ Exterior parts and chassis - (02-10) - 3-2. Model: AOUH24LUAS1 3. Outdoor unit parts list...
  • Page 33 Item no. Part no. Part name Service part 9383880001 Top panel assy ♦ 9383779008 Protective net ♦ 9375361013 Net rubber ♦ 9900984038 Thermistor (Heat exchanger) ♦ 9900727154 Thermistor assy ♦ 9383607004 Thermo holder ♦ 9383874000 Right panel sub assy ♦ 9384997005 Rear pipe cover ♦...
  • Page 34 ¢ Compressor - (02-12) - 3-2. Model: AOUH24LUAS1 3. Outdoor unit parts list...
  • Page 35 Item no. Part no. Part name Service part 9900565091 Thermistor (Outdoor temp.) ♦ 9357804002 Thermostat holder ♦ 9900186029 Pressure switch ♦ 9374425723 4-way valve assy ♦ 9970194016 Solenoid ♦ 9380416029 Joint pipe D ♦ 9970209000 Expansion valve coil ♦ 9375250225 Accumulator assy ♦...
  • Page 36 3-3. Models: AOUH30LUAS1 and AOUH36LUAS1 ¢ Exterior parts and chassis - (02-14) - 3-3. Models: AOUH30LUAS1 and AOUH36LUAS1 3. Outdoor unit parts list...
  • Page 37 Item no. Part no. Part name Service part 9383880001 Top panel assy ♦ 9381013005 Protective net ♦ 9375361013 Net rubber ♦ 9900984038 Thermistor (Heat exchanger) ♦ 9900727154 Thermistor assy ♦ 9383607004 Thermo holder ♦ 9383874017 Right panel sub assy ♦ 9384997005 Rear pipe cover ♦...
  • Page 38 ¢ Compressor - (02-16) - 3-3. Models: AOUH30LUAS1 and AOUH36LUAS1 3. Outdoor unit parts list...
  • Page 39 Item no. Part no. Part name Service part 9380516019 S-ABS (top) ♦ 9900565091 Thermistor (Outdoor temp.) ♦ 9900186029 Pressure switch ♦ 9374425761 4-way valve assy ♦ 9970194016 Solenoid ♦ 9375250188 Accumulator assy ♦ 9970209000 Expansion valve coil ♦ 9380416012 Joint pipe D ♦...
  • Page 40 4. Accessories 4-1. Indoor unit ¢ Models: ARUH18LUAS, ARUH24LUAS, ARUH30LUAS, and ARUH36LUAS Part name Exterior Part name Exterior Operation manual Cable tie (large) Installation manual Cable tie (medium) (indoor unit) →asher Drain hose insulation Coupler heat insulation Drain hose (large)
  • Page 41 4-2. Outdoor unit ¢ Model: AOUH18LUAS1 Part name Exterior Part name Exterior Installation manual Cable tie Drain pipe Drain cap ¢ Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 Part name Exterior Part name Exterior Installation manual Drain cap Drain pipe - (02-19) - 4-2.
  • Page 42 5. Optional parts 5-1. Indoor unit ¢ Controllers Exterior Part name Model name Summary Easy finger touch operation with LCD Office Fri 10:00AM Mode Set Temp. →ired Remote panel. Backlit LCD enables easy Cool 80°F Custom Auto UTY-RNRUZ* Auto 74°F Heat Controller operation in a dark room.
  • Page 43 ¢ Others Exterior Part name Model name Summary Thermo-sensor for sensing the Remote Sensor UTY-↓SZ↓Z* temperature of arbitrary place in the Unit room. Long-life Filter can be mounted to the Long-life Filter UTD-LFNB indoor unit. (For 18-30 model) Long-life Filter can be mounted to the Long-life Filter UTD-LFNA indoor unit.
  • Page 44 Exterior Part name Model name Summary This converter can control Fujitsu General products using a third-party Thermostat UTY-TTR↓Z* thermostat controller. Converter Connecting point: Terminal block (Y1, Y2) on Main PCB This converter is required when connecting single split system to VRF Network UTY-VTG↓...
  • Page 45 6. Refrigerant system diagrams 6-1. Model: AOUH18LUAS1 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 (Heat exchanger middle temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat exchanger out temperature) : Thermistor (Pipe temperature)
  • Page 46 6-2. Model: AOUH24LUAS1 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 middle temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat exchanger out temperature) : Thermistor (Pipe temperature) : Thermistor (Room temperature)
  • Page 47 6-3. Models: AOUH30LUAS1 and AOUH36LUAS1 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 middle temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat exchanger out temperature) : Thermistor (Pipe temperature)
  • Page 48 7. Wiring diagrams 7-1. Indoor unit ¢ Models: ARUH18LUAS and ARUH24LUAS - (02-26) - 7-1. Indoor unit 7. →iring diagrams...
  • Page 49 ¢ Models: ARUH30LUAS and ARUH36LUAS - (02-27) - 7-1. Indoor unit 7. →iring diagrams...
  • Page 50 7-2. Outdoor unit ¢ Model: AOUH18LUAS1 - (02-28) - 7-2. Outdoor unit 7. →iring diagrams...
  • Page 51 ¢ Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 - (02-29) - 7-2. Outdoor unit 7. →iring diagrams...
  • Page 52 8. PC board diagrams 8-1. Models: ARUH18LUAS and ARUH24LUAS CONTROL UNIT 18 model: EZ-0221THSE 24 model: EZ-0221WHSE EMI FILTER ZCAT1518-0730 TERMINAL CN8 Thermistor Characteristics. 2 TURNS UL1007 AWG22 RED Temperature CN300-1 DC5 V 32℉ 68℉ 86℉ CN300 Thermistor REMOTE CONTROLLER...
  • Page 53 8-2. Models: ARUH30LUAS and ARUH36LUAS CONTROL UNIT 30 model: EZ-021CHSE 36 model: EZ-0221YHSE EMI FILTER ZCAT1518-0730 TERMINAL 2 TURNS CN8 Thermistor Characteristics. UL1007 AWG22 RED CN300-1 CN300 Temperature UL1007 AWG22 WHITE DC5 V REMOTE CONTROLLER 32℉ 68℉ 86℉ CN300-2 B03B-XNISK-A-1 Thermistor (2-WIRE) WHITE...
  • Page 54 8-3. Model: AOUH18LUAS1 CONTROL UNIT 18 model: EZ-0200YHUE EMI FILTER XXXX EMI FILTER 2 TURNS XXXX EMI FILTER UL3271 AWG16 2 TURNS XXXX W400 1 TURN UL1015 AWG20 UL3271 AWG16 BLACK W401 W103 WHITE WHITE COMPRESSOR UL3271 AWG16 W402 INDOOR UL1015 AWG20 BLACK BLACK...
  • Page 55 8-4. Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 CONTROL UNIT 24 model: EZ-02201HUE 30, 36 models: EZ-02202HUE 5 V-1 UL1015 AWG20 GREEN BLACK P700 THERMISTOR (HEAT SINK TEMP.) B03B-XAKK-1-A INDOOR POWER SUPPLY/COM. BLACK BLACK TERMINAL P108 EMI FILTER EMI FILTER B3 (8.0) B-PSILE-1 GRFC-8 GRFC-13 BLUE...
  • Page 56 - (02-34) - 8-4. Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 8. PC board diagrams...
  • Page 57 3. TROUBLESHOOTING 2023.04.25 SR_CH03_AR056EF_01...
  • Page 58 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 2. Troubleshooting with error code ...............03-6 2-1.

  • Page 59: Table Of Contents

    CONTENTS (continued) 3-1. Indoor unit—No power....................03-46 3-2. Outdoor unit—No power....................03-47 3-3. No operation (Power is on) ...................03-48 3-4. No cooling/No heating ....................03-49 3-5. Abnormal noise......................03-51 3-6. →ater leaking........................03-52 4. Service parts information .................03-53 4-1. Compressor........................03-53 4-2. Inverter compressor......................03-54 4-3. Outdoor unit Electronic Expansion Valve (EEV) ............03-56 4-4.
  • Page 61 1. Error code →hen a problem occurs in the system or the connected device, the error content is notified by dis- playing the code. NOTE: This function is only available in a system with indoor or IR receiver units equipped with in- dicator lamps to show the error content.
  • Page 62 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 63 Indoor unit display Wired remote Error contents Operation [ ] Timer [ ] Economy [ ] controller (Green) (Orange) (Green) display E: 97.↓. Outdoor unit fan motor error 9 times 7 times Continuous (Outdoor unit) E: 99.↓. 4-way valve error (Outdoor unit) 9 times 9 times Continuous...
  • Page 64 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 24-36 outdoor units)"...
  • Page 65 PUMP LOW NOISE PEAK CUT POWER/ DOWN Error contents ERROR MODE E: 74.↓. Outdoor temperature ■ ● ■ ■ ○ ○ ○ ● thermistor error (Outdoor unit) E: 77.↓. Heat sink thermistor error ■ ● ■ ■ ○ ○ ○ ●...
  • Page 66 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 67 Check point 4. Check serial signal (Reverse transfer signal) Check serial signal (Reverse transfer signal) BLACK WHITE BLACK WHITE • Check if indicated value swings between AC 90 V and AC 270 V at the outdoor unit terminal 1 —3. •...
  • Page 68 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 Indoor unit...
  • Page 69 Check point 4. Check serial signal (Forward transfer signal) Check serial signal (Forward transfer signal) BLACK WHITE BLACK WHITE • Check if indicated value swings between AC 30 V and AC 130 V at outdoor unit terminal 2—3. • If it is abnormal, replace main PCB. Check point 1-2.
  • Page 70 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 71 2-4. E: 15.X. Automatic air flow adjustment error (Indoor unit) Operation indicator 1 time flash Timer indicator 5 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 15 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 •...
  • Page 72 2-5. 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 73 2-6. 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 74 2-7. 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 75 2-8. 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 76 2-9. 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 77 2-10. E: 33.X. Indoor unit motor electricity consumption detection error (Indoor unit) Operation indicator 3 time flash Timer indicator 3 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 33 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit motor electricity →hen the voltage value or the current value of the motor...
  • Page 78 2-11. E: 39.X. Indoor unit power supply error for fan motor (Indoor unit) Operation indicator 3 time flash Timer indicator 9 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 39 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 •...
  • Page 79 2-12. E: 3A.X. Indoor unit communication circuit (wired remote controller) error 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) Detect the communication error of microcomputer and...
  • Page 80 2-13. 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 81 2-14. 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 82 2-15. 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 83 2-16. E: 53.X. Drain pump error (Indoor unit) Operation indicator 5 time flash Timer indicator 3 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 53 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB Detective actuator →hen Float switch is ON for more than 3 minutes.
  • Page 84 2-17. 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 85 2-18. 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 86 2-19. 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 87 2-20. 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 (13—15) of IPM is “L”...
  • Page 88 2-21. 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 89 2-22. E: 72.X. Compressor thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 2 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: 72 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB →hen compressor temperature thermistor open or short Detective actuator...
  • Page 90 2-23. 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 91 2-24. 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 92 2-25. E: 77.X. Heat sink thermistor error (Outdoor unit) (24/30/36 model) 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...
  • Page 93 2-26. 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 50 rps, Detective actuator...
  • Page 94 2-27. E: 86.X. High pressure switch error (Outdoor unit) (24/30/36 model) 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...
  • Page 95 2-28. 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 96 2-29. 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 "Protection stop by "overcurrent generation at inverter compressor starting"...
  • Page 97 2-30. 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 98 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 02-26.
  • Page 99 2-31. 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 100 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 03-53. • Solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.970 kΩ (at 68°F [20°C]).
  • Page 101 2-32. 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 102 Check point 5. Check the refrigerant amount Check the refrigerant leakage. Check point 6. Replace the main PCB If check point 1 to 5 do not improve the symptom, replace the main PCB. - (03-42) - 2-32. E: A1.↓. Discharge temperature error (Outdoor unit) 2.
  • Page 103 2-33. E: A3.X. Compressor temperature error (Outdoor unit) Operation indicator 10 time flash Timer indicator 3 time flash Indoor unit Indicator Economy indicator Continuous flash Error code E: A3 Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB Protection stop by compressor temperature ≥...
  • Page 104 Check point 5. Check the refrigerant amount Check the refrigerant leakage. Check point 6. Replace the main PCB If check point 1 to 5 do not improve the symptom, replace the main PCB. - (03-44) - 2-33. E: A3.↓. Compressor temperature error (Outdoor unit) 2.
  • Page 105 2-34. E: AC.X. Heat sink temperature error (Outdoor unit) (24/30/36 model) 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 106: Indoor Unit-No Power

    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 107: 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 108: 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 109: 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 110 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 111: 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 112: 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 113: Service Parts Information

    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 114: Inverter Compressor

    4-2. Inverter compressor ¢ Model: AOUH18LUAS1 Check point 1. Check connection • Check terminal connection of compressor (loose or incorrect wiring) W(C) V(S) (BLACK) (WHITE) Main PCB U(R) (RED) • Check terminal connection of main PCB (loose or incorrect wiring) Main PCB W400(U) W401(V) W402(W)
  • Page 115 ¢ Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 Check point 1. Check the terminal connection. • Check the following terminal connections of the compressor. (Loosening or incorrect wiring.) S (V) C (W) R (U): Red S (V): →hite Main PCB C (W): Black R (U) •...

  • Page 116: Outdoor Unit Electronic Expansion Valve (Eev)

    4-3. Outdoor unit Electronic Expansion Valve (EEV) ¢ Model: AOUH18LUAS1 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 02-26. Check point 2.
  • Page 117 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 118 ¢ Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 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 02-26. Check point 2.
  • Page 119 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 120: 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. Check resistance of indoor fan motor •...

  • Page 121: 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. Check resistance of outdoor fan motor Refer to below.

  • Page 122: 4-Way Valve Coil (Solenoid Coil)/4-Way Valve

    4-7. 4-way valve coil (solenoid coil)/4-way valve Check point 1. Check connection • Check the connection of connector P60. BLACK SOLENOID COIL BLACK Check Point 2 : Check solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value ≈...

  • Page 123: 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) 25.92 1.39 50.0 (10.0) 20.17 1.66 59.0 (15.0) 15.84 1.94 68.0 (20.0)

  • Page 124: Outdoor Unit

    5-2. Outdoor unit ¢ Heatsink thermistor  Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 Temperature °F (°C) Resistance (kΩ) Voltage (V) -22.0 (-30.0) 94.26 0.08 -12.0 (-25.0) 67.95 0.11 -4.0 (-20.0) 49.62 0.15 5.0 (-15.0) 36.68 0.20 14.0 (-10.0) 27.42 0.26 23.0 (-5.0) 20.73 0.34 32.0 (0.0)
  • Page 125 ¢ 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) 129.84 0.46 50.0 (10.0)
  • Page 126 ¢ 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 127 ¢ 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 128 ¢ 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 129 4. CONTROL AND FUNCTIONS 2023.04.25 SR_CH04_AR056EF_01...
  • Page 130 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 ............04-5 1-5. Rotation number of compressor limitation by outdoor temperature ........04-8 2.

  • Page 131: Rotation Number Control Of Compressor

    • Rotation number range of compressor Unit: rps Model name Minimum frequency Maximum frequency ARUH18LUAS ARUH24LUAS ARUH30LUAS ARUH36LUAS - (04-1) - 1-1. Cooling operation 1. Rotation number control of compressor...
  • Page 132 Unit: rps Outdoor Indoor unit fan mode Model name temperature HIGH QUIET zone A zone B zone C zone ARUH18LUAS D zone E zone F zone A zone B zone C zone ARUH24LUAS D zone E zone F zone A zone...

  • Page 133: Heating Operation

    • Rotation number range of compressor Unit: rps Model name Minimum frequency Maximum frequency ARUH18LUAS ARUH24LUAS ARUH30LUAS ARUH36LUAS - (04-3) - 1-2. Heating operation 1. Rotation number control of compressor...

  • Page 134: Dry Operation

    Zone is defined by set temperature and room temperature. • Rotation number range of compressor Unit: rps Model name Outdoor temperature zone Operating frequency ↓ zone ARUH18LUAS J zone Y zone ↓ zone ARUH24LUAS J zone Y zone ↓ zone...

  • Page 135: Rotation Number Of Compressor At Normal Start-Up

    1-4. Rotation number of compressor at normal start-up ¢ Model: AOUH18LUAS1 Rotation number of compressor soon after starting is controlled as below. Rotation number VI Rotation number V Rotation number IV Rotation number III Rotation number II Rotation number I Time 1 Time 2 Time 3...
  • Page 136 ¢ Model: AOUH24LUAS1 Rotation number of compressor soon after starting is controlled as below. Rotation number VI Rotation number V Rotation number IV Rotation number III Rotation number II Rotation number I Time 1 Time 2 Time 3 Time 4 Time 5 Time 6 •...
  • Page 137 ¢ Models: AOUH30LUAS1 and AOUH36LUAS1 Rotation number of compressor soon after starting is controlled as below. Rotation number X Rotation number IX Rotation number VIII Rotation number VII Rotation number VI Rotation number V Rotation number IV Rotation number III Rotation number II Rotation numbery I Time 1...

  • Page 138: Rotation Number Of Compressor Limitation By Outdoor Temperature

    1-5. Rotation number of compressor limitation by outdoor temperature ¢ Model: AOUH18LUAS1 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)
  • Page 139 ¢ Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 The minimum rotation number of compressor is limited by outdoor temperature as below. • Cooling/Dry mode H zone 125.6°F (52°C) G zone 122.0°F (50°C) F zone 107.6°F (42°C) E zone 100.4°F (38°C) D zone 69.8°F (21°C) C zone...
  • Page 140 • Heating mode I zone 68.0°F (20°C) H zone 60.8°F (16°C) G zone 53.6°F (12°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) 5.0°F B zone (-15°C) A zone Unit: rps Limitation of compressor Model name Outdoor temperature zone frequency...

  • Page 141: 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 1.0 °F (0.5 °C) steps.
  • Page 142 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 143: 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 Fan mode mode ARUH18LUAS ARUH24LUAS ARUH30LUAS ARUH36LUAS HIGH 1,020 MED+ LO→ Heating QUIET Cool air prevention S-LO→...
  • Page 144 ¢ 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 145 ¢ Moisture return prevention control (cooling and dry mode) Switch the airflow AUTO at cooling mode, and the indoor fan motor will run as shown below. Compressor Indoor fan setting airflow Indoor fan speed S-LOW 30 (sec) - (04-15) - 3-1.

  • Page 146: 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: AOUH18LUAS1 Fan speed is defined by outdoor temperature and compressor frequency. •...
  • Page 147  Model: AOUH24LUAS1 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 148  Models: AOUH30LUAS1 and AOUH36LUAS1 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 149: Timer Operation Control

    4. Timer operation control 4-1. Wireless remote control On/Off timer Program timer Sleep timer Weekly timer ○ ○ ○ — ¢ On/Off timer • Off timer: →hen the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 150 ¢ 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 151: Ired Remote Control

    4-2. Wired remote control Temperature On/Off timer Program timer Sleep timer Weekly timer Setback Timer ○ ○ ○ ○ ○ ¢ On/Off timer • Off timer: →hen the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 152 ¢ 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 153 ¢ 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 154: Defrost Operation Control

    5. Defrost operation control Tn: Outdoor unit heat exchanger temperature Ta: Outdoor temperature Tn10: Temperature at 10 minutes after compressor start Tnb: Temperature before 5 minutes Triggering condition • The defrost operation starts when outdoor unit heat exchanger temperature sensor detects the temperature lower than the values shown below.
  • Page 155 Release condition • – Model: AOUH18LUAS1 Depending on the triggering condition, different release conditions apply. • Normal defrost operation The defrost operation is released when either one of the conditions below is satisfied. 55.4°F (13°C) or more (Ta ≤ 33.8°F [1°C]) Outdoor unit heat exchanger temperature (after 1 minute or later since compressor start) 50.0°F (10°C) or more (Ta >...

  • Page 156: Defrost Operation In Heating Operation Stopped

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

  • Page 157: Various Control

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

  • Page 158: Compressor Preheating

    6-5. Compressor preheating By preheating the compressor, warm airflow is quickly discharged when the operation is started. • Model: AOUH18LUAS1 – Triggering condition • 30 minutes after compressor stopped. • Outdoor unit heat exchanger temperature (Tn) 28.4°F (-2°C) 24.8°F (-4°C) →hen the jumper wire (JM2) is disconnected: 44.6°F (7°C)

  • Page 159: External Electrical Heater Control

    6-6. 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 160: Drain Pump Control

    6-8. Drain pump control ¢ Drain control for cooling operation  During the compressor in operation • Triggering condition The thermostat is turned on during cooling or dry mode. • Operation details The drain pump is turned on. • Release condition –...
  • Page 161  Overflow control • Triggering condition The float switch is turned on. • Operation details – The drain pump is turned on. – →hen the operation mode is cooling or dry, operate the followings. • The compressor is stopped. • Then indoor fan control is turned off. •...

  • Page 162: Prevention To Restart For 3 Minutes (3 Minutes St)

    6-9. Prevention to restart for 3 minutes (3 minutes st) →hen the compressor fails to start for the number of times below, it does not enter operation status for 3 minutes. • Model: AOUH18LUAS1 Retry number Retry set number • Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 Retry number Retry set number →hen the compressor fails to start in the retry set number above, the compressor is stopped.

  • Page 163: Unit Status Monitoring And The Detected Value Indication

    6-12. 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 →ired Remote Controller (Touch Panel).
  • Page 164 Available Sensor ID Sensor ID Item Unit Remarks 0: Off, 1: On NOTE: The value is output even if Error On/Off (External output) 00: — the function setting or rotary switch is not set. 0: Off, 1: On Indoor unit fan interlocking On/Off NOTE: The value is output even if 00: —...
  • Page 165 Available Sensor ID Sensor ID Item Unit Remarks Outdoor unit fan 2 total operating 11: h hours Outdoor low noise input (External 00: — 0: Off, 1: On input) 0: Off 1: Mode 4 (100%) 2: Mode 3 (75%) Outdoor peak cut (External input) 00: —...

  • Page 166: Various Protections

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

  • Page 167: Current Release Control

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

  • Page 168: Indoor Unit Fan Motor Over Temperature Protection

    7-4. Indoor unit fan motor over temperature protection The fan motor over temperature protection activates after two judgments when fulfilling any of the following conditions. • Detected that the rotation number of the fan motor stays 300 rpm or less for 10 seconds after 90 seconds from the fan operation started.

  • Page 169: High Temperature And High Pressure Release Control

    7-8. High temperature and high pressure release control The compressor is controlled as follows. ¢ Model: AOUH18LUAS1 • Cooling mode Indoor unit heat exchanger Indoor unit heat exchanger temperature rises temperature drops 141.8°F (61°C) Zone A 140.0°F (60°C) 138.2°F (59°C) Zone B 129.2°F (54°C) Zone C...
  • Page 170 ¢ Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1 The compressor is controlled as follows. • Cooling mode Indoor unit heat exchanger Indoor unit heat exchanger temperature rises temperature drops 149.0°F (65°C) Zone A 143.6°F (62°C) 140.0°F (60°C) Zone B Zone C Stable zone Zone D Zone Operation...
  • Page 171 5. FILED WORKING 2023.04.25 SR_CH05_AR056EF_01...
  • Page 172 CONTENTS 5. FILED WORKING 1. Function settings (for indoor unit).............05-1 1-1. Function settings on indoor unit (setting by DIP switch) ..........05-1 1-2. Function settings by using remote controller ..............05-2 2. Function settings (for 24-36 outdoor units) ..........05-11 2-1. Control PCB and switch buttons location..............05-11 2-2.

  • Page 173: Function Settings (For Indoor Unit)

    1. Function settings (for indoor unit) To adjust the functions of this product according to the installation environment, various types of function settings are available. NOTE: Incorrect settings can cause a product malfunction. 1-1. Function settings on indoor unit (setting by DIP switch) By using some components on the PCB, you can change the function settings.

  • Page 174: Function Settings By Using Remote Controller

    1-2. Function settings by using remote controller Some function settings can be changed on the remote controller. After confirming the setting proce- dure and the content of each function setting, select appropriate functions for your installation envi- ronment. ¢ Setting procedure by using remote controller Remote controller is not attached for this product.
  • Page 175 2) Static pressure Select the appropriate static pressure according to the installation conditions. Function number Setting value Setting description Factory setting 0.12 in→G (30 Pa) 0.16 in→G (40 Pa) 0.20 in→G (50 Pa) 0.24 in→G (60 Pa) 0.28 in→G (70 Pa) 0.32 in→G (80 Pa) 0.36 in→G (90 Pa) 0.40 in→G (100 Pa)
  • Page 176 3) Room temperature control for indoor unit sensor 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 177 4) Room temperature control for wired remote controller sensor Depending on the installed environment, correction of the wire remote temperature sensor may be required. Select the appropriate control setting according to the installed environment. To change this setting, set Function 42 to “Both“ (01). Ensure that the Thermo Sensor icon is displayed on the remote controller screen.
  • Page 178 7) Cold air prevention This setting is to disable the cold air prevention function during heating operation. →hen disabled, the fan setting will always follow the setting on the remote controller. (Excluding defrost mode) Function number Setting value Setting description Factory setting Enable ♦...
  • Page 179 11) 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 180 13) Operating temperature switching of external heaters Sets the temperature conditions when the external heater is ON. For details, refer to “External heater output” in "Details of control output function" on page 05-25. Setting description Setting value of function 61: Function Setting Factory...
  • Page 181 15) Outdoor temperature zone boundary temperature B Setting required if changing of the outdoor temperature setting for heat pump only zone is required when auxiliary heater control by outdoor temperature 1 and 3 is performed on the indoor unit. For details, refer to “External heater output” in "Details of control output function"...
  • Page 182 19) Fan delay time Sets the fan delay time when the heater is turned off. Function number Setting value Setting description Factory setting 1 minute ♦ 50 seconds 40 seconds 30 seconds 20) External heater use in defrosting Enables or disables external heater use in defrosting. NOTE: Inappropriate heater selection may cause cold air in defrosting.

  • Page 183: Function Settings (For 24-36 Outdoor Units)

    2. Function settings (for 24-36 outdoor units) Perform appropriate function setting locally according to the installation environment. NOTE: Incorrect settings can cause a product malfunction. CAUTION • Before setting up the switch buttons, discharge the static electricity from your body. •...
  • Page 184 ¢ Switch buttons and the functions LED lamps S134 S133 S132 S131 S130 Switch buttons LED lamp Function or operation method Lights on while power on. (1) PO→ER/MODE Green Blinks to show the local setting on the outdoor unit or the error code. (2) ERROR Blinks during error operation.

  • Page 185: Local Setting Procedure

    2-2. Local setting procedure NOTE: Before performing the function setting, be sure to stop the operation of the air conditioner. ¢ Low noise mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of PO→ER/MODE blinks 9 times, press the ENTER switch but- ton (S132).
  • Page 186 ¢ Peak cut mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of PO→ER/MODE blinks 9 times, press the ENTER switch but- ton (S132). PUMP POWER LOW NOISE PEAK CUT DOWN...

  • Page 187: External Input And Output (For Indoor Unit)

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

  • Page 188: External Input

    3-1. External input • “Operation/Stop” mode or "Forced stop" mode can be selected with function setting of indoor unit. • A twisted pair cable (22 A→G) should be used. Maximum length of cable is 492 ft (150 m). • Use an external input and output cable with appropriate external dimension, depending on the number of cables to be installed.
  • Page 189 ¢ Input signal type • Indoor unit Input signal type is only "Edge". Edge • External Input and Output PCB The input signal type can be selected. Signal type (edge or pulse) can be switched by the DIP switch 2 (S→2) on the External Input and Output PCB.

  • Page 190: External Output

    3-2. External output Use an external output cable with appropriate external dimension, depending on the number of ca- bles to be installed. ¢ Indoor unit • A twisted pair cable (22 A→G) should be used. Maximum length of cable is 82 ft (25 m). •...

  • Page 191: Setting Of External Input And Output

    3-3. Setting of external input and output • Indoor unit Input Connection point Function setting number 46 Function Operation/Stop mode 1 (Setting prohibited) Terminal Forced stop mode Operation/Stop mode 2 Output Connection point Function setting number 60 Function Operation/Stop 01—04 Cooling thermostat On Heating thermostat On Operation/Stop...
  • Page 192 • External Input and Output PCB Switch setting Ex IN Ex OUT Rotary switch Edge Operation/Stop Not available Indoor unit fan Operation/Stop Error status operation Pulse Operation Stop status Indoor unit fan Forced External heater Not available Error status operation thermostat off output status...

  • Page 193: Details Of Control Input Function

    3-4. Details of control input function ¢ Operation/Stop mode 1 • In the case of "Edge" input External Input and Output PCB Function External input Input signal Command setting Rotary switch Operation — Input of indoor unit Terminal Stop 46-00 Operation External Input and Edge...
  • Page 194 ¢ Forced stop • In the case of "Edge" input External Input and Output PCB Function External input Input signal Command setting Rotary switch Forced stop (R.C. disabled) — Input of indoor unit Terminal Normal (R.C. enabled) 46-02 Forced stop (R.C.
  • Page 195 ¢ Operation/Stop mode 2 • In the case of "Edge" input External Input and Output PCB Function External input Input signal Command setting Rotary switch Operation (R.C. enabled) — Input of indoor unit Terminal Stop (R.C. disabled) 46-03 Operation (R.C. enabled) External Input and Edge Ex IN 1...
  • Page 196 ¢ Forced thermostat off External Input and Output External input Input signal Command Rotary switch Thermostat off External Input and 2, B, C, D Ex IN 1 Output PCB Normal operation Thermostat off External Input and 4, 7, 8, A Ex IN 1 Output PCB Normal operation...

  • Page 197: Details Of Control Output Function

    3-5. Details of control output function ¢ Operation status External Input and Function Output PCB External output Output signal Status setting Rotary switch Operation 60-00 — Output of indoor unit CN47 60-06 Stop Operation External Input and — 1, B, C, D Ex OUT 1 Output PCB Stop...
  • Page 198 ¢ Indoor unit fan operation status External Input and Function Output PCB External output Output signal Status setting Rotary switch Fan run 60-10 — Output of indoor unit CN47 Fan stop Fan run External Input and — 2, 3, 7, 8, B, D Ex OUT 2 Output PCB Fan stop...
  • Page 199 ¢ External heater output External Input and Function Output PCB External output Output signal Control setting Rotary switch Heater on 60-11 — Output of indoor unit CN47 Heater off Heater on External Input and — 2, B, C Ex OUT 3 Output PCB Heater off Output signal...
  • Page 200 • Design and install external heater appropriately with considering its protection. • 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 heat- ing device. - (05-28) - 3-5.
  • Page 201  Auxiliary equipment control by room temperature Auxiliary equipment control is switchable by room temperature. Auxiliary equipment switching is per- formed for each room temperature divided to following 3 zones. Zone A Ts +0.9°F (0.5 °C) Ts: Setting temperature Ts -0.9°F (-0.5 °C) Tr: Room temperature Zone B Zone C...
  • Page 202  Auxiliary heater control 1 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 • Error occurred •...
  • Page 203  Heat pump prohibition control Perform heating by external heater only. Indoor unit is continuous thermostat off. Operation Condition Heater is on as shown in following diagram of heating Heater on temperature. DIP-S→101-3 • Heater is off as shown in following diagram of heating temperature.
  • Page 204  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 is on as shown in following diagram of heating Heater on temperature.
  • 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 Heat pump Combination zone prohibition only zone zone Outdoor temperature zone* Comp. On/Off 12 V Heater DIP-SW101-3: On DIP-SW101-3: Off *: 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 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 207 • 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 prohibition zone Outdoor temperature zone * Comp. On/Off 12 V Heater DIP-SW101-3 On DIP-SW101-3 Off * 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 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 209 • 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 DIP-SW101-3 On DIP-SW101-3 Off *: 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 210  Auxiliary heat pump control • External heater output Operation Condition Heater is on as shown in following diagram of heating Heater on temperature. DIP-S→101-3 • Heater is off as shown in following diagram of heating temperature. • Other than heating mode Indoor unit fan •...
  • Page 211  Auxiliary heat pump control by outdoor temperature 1 • External heater output Operation Condition Heater is on as shown in following diagram of heating Heater on temperature. DIP-S→101-3 • Heater is off as shown in following diagram of heating temperature.
  • Page 212 • Outdoor temperature zone Outdoor temp. Combination zone     ( Heat pump + Heater) A + 3.6°F ( 2°C): -0.4°F (-18°C) *A: -4°F (-20°C)   Heater only zone   *: Adjustable by function setting 66 • Operation status 46.4°F (8°C) 42.8°F (6°C) Outdoor temperature (Factory setting)
  • Page 213  Auxiliary heat pump control by outdoor temperature 2 • External heater output Operation Condition Heater is on as shown in following diagram of heating Heater on temperature. DIP-S→101-3 • Heater is off as shown in following diagram of heating temperature.
  • Page 214 • Outdoor temperature zone Outdoor temp. Heater only zone B + 3.6°F (2°C): 46.4°F (8°C) *B: 42.8°F (6°C) Combination zone (Heat pump + Heater) *: Adjustable by function setting 67 • 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)
  • Page 215  Auxiliary heat pump control by outdoor temperature 3 • External heater output Operation Condition Heater is on as shown in following diagram of heating Heater on temperature. DIP-S→101-3 • Heater is off as shown in following diagram of heating temperature.
  • Page 216 • Outdoor temperature zone Outdoor temp. Heater only zone     B + 3.6°F (2°C): 46.4°F (8°C) B: 42.8°F (6°C)*   Combination zone   (Heat pump + Heater) A + 3.6°F (2°C): -0.4°F (-18°C) A: -4°F (-20°C)*   Heater only zone  ...
  • Page 217 ¢ 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 Output 3 individual Not used 60-07 Output 2 connection 60-08...

  • Page 218: External Input And Output (For 24-36 Outdoor Units)

    4. External input and output (for 24-36 outdoor units) →ith using external input and output functions, this product can be operated inter-connectedly with an external device. Connector Input Output Remarks P580 Low noise mode — PA580 Peak cut mode — See external input/output settings for details.
  • Page 219 ¢ Peak cut mode By performing following on-site work, operation that suppresses the current value can be enabled: The air conditioner is set to the “Peak cut mode” when closing the contact input of a commercial timer or on/off switch to a connector on the control PCB of the outdoor unit. •...

  • Page 220: External Output

    4-2. External output →ith using external output function, some status signals are transmitted to the control PCB, and the related LED lamp indicates the status of this product. ¢ Error status output Signal on air conditioner error status is generated when a malfunction occurs. •...
  • Page 221 ¢ Compressor status output Signal on compressor operation status is generated when the compressor is running. • Circuit diagram example • Output voltage (Vcc): DC 12 Outdoor unit V 50 mA or less control PCB Connected unit (Locally purchased) • *: Make the distance from Example: Connector...

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