Page 1 AIR CONDITIONER Ceiling type SERVICE MANUAL INDOOR ABYG18KRTA ABYG24KRTA ABYG36KRTA ABYG22KRTA ABYG30KRTA ABYG45KRTA OUTDOOR AOYG18KBTB AOYG24KBTB AOYG30KBTB AOYG45KBTB AOYG22KBTB AOYG36KBTB SR_AB004EF_06 2020.12.09...
Page 2 • Product specifications and design are subject to change without notice for future improvement. • For further details, please check with our authorized dealer. Trademarks ™ FGLair is trademark of Fujitsu General Limited in the United States, other countries or both. ™ Google Play is trademark of Google Inc. ®...
Page 3 CONTENTS 1. GENERAL INFORMATION 2. TECHNICAL DATA AND PARTS LIST 3. TROUBLESHOOTING 4. CONTROL AND FUNCTIONS 5. FILED WORKING...
Page 5 1. GENERAL INFORMATION 2020.11.16 SR_CH01_AB004EF_03...
Page 6 CONTENTS 1. GENERAL INFORMATION 1. Specifications....................01-1 1-1. Indoor unit ........................01-1 1-2. Outdoor unit........................01-7 2. Dimensions....................01-10 2-1. Indoor unit ........................01-10 2-2. Outdoor unit........................01-14...
Page 7 1. Specifications 1-1. Indoor unit Ceiling Type Inverter heat pump Model name ABYG18KRTA ABYG22KRTA Power supply 230 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 198—264 V Rated Btu/h 17,700 20,500 Cooling 0.9—5.9 0.9—6.7 Min.—Max. Btu/h 3,100—20,100...
Page 8 Specifications for ErP Lot10 Model name ABYG18KRTA ABYG22KRTA Cooling Energy efficiency class Heating (Average) Cooling 5.2 (35°C) 6.0 (35°C) Pdesign Heating (Average) 4.4 (-10°C) 4.8 (-10°C) SEER Cooling kWh/kWh SCOP Heating (Average) Annual energy consumption kWh/a QHE (Average) 1,501 1,677...
Page 9 Ceiling Type Inverter heat pump Model name ABYG24KRTA ABYG30KRTA Power supply 230 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 198—264 V Rated Btu/h 23,200 29,000 Cooling 0.9—8.0 2.8—10.0 Min.—Max. Btu/h 3,100—27,300 9,600—34,100 Capacity 10.0 Rated Btu/h 25,600 34,100...
Page 10 Specifications for ErP Lot10 Model name ABYG24KRTA ABYG30KRTA Cooling Energy efficiency class Heating (Average) Cooling 6.8 (35°C) 8.5 (35°C) Pdesign Heating (Average) 6.0 (-10°C) 8.0 (-10°C) SEER Cooling kWh/kWh SCOP Heating (Average) Annual energy consumption kWh/a QHE (Average) 2,042 2,796 Cooling Sound power level HIGH...
Page 11 Ceiling Type Inverter heat pump Model name ABYG36KRTA ABYG45KRTA Power supply 230 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 198—264 V 12.1 Rated Btu/h 32,400 41,300 Cooling 2.8—11.2 4.0—13.5 Min.—Max. Btu/h 9,600—38,200 13,600—46,000 Capacity 10.8 13.5 Rated Btu/h...
Page 12 Specifications for ErP Lot10 Model name ABYG36KRTA Cooling Energy efficiency class Heating (Average) Cooling 9.5 (35°C) Pdesign Heating (Average) 8.7 (-10°C) SEER Cooling 6.37 kWh/kWh SCOP Heating (Average) 4.21 Annual energy consump- kWh/a tion QHE (Average) 2,904 Cooling Sound power level HIGH dB (A) Heating...
Page 13 1-2. Outdoor unit Type Inverter heat pump Model name AOYG18KBTB AOYG22KBTB Power supply 230 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 198—264 V Starting current Cooling 2,160 2,240 Airflow rate Heating 1,830 1,960 Type × Q'ty Propeller ×...
Page 14 Type Inverter heat pump Model name AOYG24KBTB AOYG30KBTB Power supply 230 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 198—264 V Starting current 11.1 Cooling 2,700 3,750 Airflow rate Heating 2,700 3,750 Type × Q'ty Propeller × 1 Motor output Cooling Sound pressure level *1...
Page 15 Type Inverter heat pump Model name AOYG36KBTB AOYG45KBTB Power supply 230 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 198—264 V Starting current 13.0 18.6 Cooling 3,750 4,450 Airflow rate Heating 3,750 4,450 Type × Q'ty Propeller ×...
Page 16 2. Dimensions 2-1. Indoor unit ¢ Models: ABYG18KRTA and ABYG22KRTA Unit: mm 1,080 49 84 125 103 Side view Top view ø100-mm hole Rear view Suspension bolt pitch Dimensions Indoor unit (Top view) (Space required for inﬆallation) The length of the bolt here is 30 mm.
Page 17 ¢ Models: ABYG24KRTA and ABYG30KRTA Unit: mm 1,390 1,233 49 84 125 103 Side view Top view ø100-mm hole Rear view Suspension bolt pitch 1,233 Dimensions (Space required for inﬆallation) Indoor unit (Top view) The length of the bolt here is 30 mm. Indoor unit - (01-11) - 2-1.
Page 18 ¢ Models: ABYG36KRTA and ABYG45KRTA Unit: mm 1,700 1,543 49 84 125 103 Side view Top view ø100-mm hole Rear view Suspension bolt pitch 1,543 Dimensions (Space required for inﬆallation) Indoor unit (Top view) The length of the bolt here is 30 mm. Indoor unit - (01-12) - 2-1.
Page 19 ¢ Installation space requirements Unit: mm Ceiling Indoor unit 30 or more Ceiling 200 or more 0 or more Obﬆruction Floor Required ceiling height varies according to the ceiling mode setting of function setting No. 20. Ceiling height (m) Ceiling mode Standard High ceiling 18, 22, 24, and 30 models...
Page 20 2-2. Outdoor unit ¢ Models: AOYG18KBTB and AOYG22KBTB Unit: mm 4-M10 hole Pitch of bolts for installation Top view Side view Front view Side view Airflow Drain port Ø42 Bottom view Side view (Valve part) - (01-14) - 2-2. Outdoor unit 2.
Page 21 ¢ Model: AOYG24KBTB Unit: mm 4-M10 hole Pitch of bolts for installation Top view Side view Front view Side view Airflow Drain port Ø42 Bottom view Side view (Valve part) - (01-15) - 2-2. Outdoor unit 2. Dimensions...
Page 22 ¢ Model: AOYG36KBTB Unit: mm 35.7 Top view 3 Way valve (Liquid) 3 Way valve (Gas) 25 67 Ф28: Cable port Pipe port Ф28: Cable port Ф28: Cable port Ф28: Cable port Ф28: Cable port Ф28: Cable port Pipe port Pipe port Front view Side view...
Page 23 ¢ Model: AOYG45KBTB Unit: mm 35.7 Top view 3 Way valve (Liquid) 3 Way valve (Gas) 129.1 Pipe port Ф28 Ф28 85.3 Cable port Pipe port Ф28: Cable port Cable port Pipe port Pipe port Pipe port Front view Side view Rear view 62.6 15.2...
Page 24 - (01-18) - 2-2. Outdoor unit 2. Dimensions...
Page 25 2. TECHNICAL DATA AND PARTS LIST 2020.12.09 SR_CH02_AB004EF_05...
Page 26 7. Wiring diagrams ..................02-33 7-1. Indoor unit ........................02-33 7-2. Outdoor unit........................02-35 8. PC board diagrams ...................02-38 8-1. Models: ABYG18KRTA, ABYG22KRTA, ABYG24KRTA, and ABYG30KRTA .....02-38 8-2. Models: ABYG36KRTA and ABYG45KRTA ..............02-39 8-3. Model: AOYG18KBTB ....................02-40 8-4. Model: AOYG22KBTB ....................02-41 8-5. Model: AOYG24KBTB ....................02-42...
Page 27 • 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 28 2. Indoor unit parts list 2-1. Models: ABYG18KRTA and ABYG22KRTA ¢ Chassis - (02-2) - 2-1. Models: ABYG18KRTA and ABYG22KRTA 2. Indoor unit parts list...
Page 29 ♦ 9900892029 Thermistor (Pipe) ♦ 9384287021 Evaporator total assy ♦ 9384364029 Drain pan total assy (2-fan) ♦ 9358746004 Drain cap ♦ 9384241023 Front panel (2-fan) assy ♦ - (02-3) - 2-1. Models: ABYG18KRTA and ABYG22KRTA 2. Indoor unit parts list...
Page 30 2-2. Models: ABYG24KRTA and ABYG30KRTA ¢ Chassis - (02-4) - 2-2. Models: ABYG24KRTA and ABYG30KRTA 2. Indoor unit parts list...
Page 31 Item no. Part no. Part name Service part 9384321015 Intake grille B sub assy ♦ 9383344008 Grille hinge ♦ 9384321008 Intake grille A sub assy ♦ 9383342004 Air filter A ♦ 9383342011 Air filter B ♦ 9384307002 Casing U assy ♦...
Page 32 2-3. Models: ABYG36KRTA and ABYG45KRTA ¢ Chassis - (02-6) - 2-3. Models: ABYG36KRTA and ABYG45KRTA 2. Indoor unit parts list...
Page 33 Item no. Part no. Part name Service part 9384321008 Intake grille A sub assy ♦ 9383344008 Grille hinge (3 pcs.) ♦ 9383342004 Air filter A ♦ 9384307002 Casing U assy ♦ 9357921006 Bearing B assy ♦ 9384110008 Sirocco fan assy ♦...
Page 34 3. Outdoor unit parts list 3-1. Models: AOYG18KBTB and AOYG22KBTB ¢ Exterior parts and Chassis - (02-8) - 3-1. Models: AOYG18KBTB and AOYG22KBTB 3. Outdoor unit parts list...
Page 35 Item no. Part no. Part name Service part 9322556028 Top panel assy ♦ 9322811011 Protective net ♦ 9322552020 Cabinet right assy ♦ 9322570000 Switch cover assy ♦ 9900435028 Terminal ♦ 9709683385 Main PCB (Service) (for 18 model) ♦ 9709683392 Main PCB (Service) (for 22 model) ♦...
Page 36 ¢ Compressor - (02-10) - 3-1. Models: AOYG18KBTB and AOYG22KBTB 3. Outdoor unit parts list...
Page 37 Item no. Part no. Part name Service part 9322433008 Compressor assy ♦ 9322783004 4-way valve assy ♦ 9970195006 Solenoid ♦ 9970173028 Expansion valve coil ♦ 9322463029 Pulse motor valve assy ♦ 9322474001 2-way valve assy ♦ 9387831016 3-way valve assy ♦...
Page 38 3-2. Model: AOYG24KBTB ¢ Exterior parts and Chassis - (02-12) - 3-2. Model: AOYG24KBTB 3. Outdoor unit parts list...
Page 39 Item no. Part no. Part name Service part 9322556073 Top panel assy ♦ 9322811042 Protective net ♦ 9322552150 Cabinet right assy ♦ 9322570031 Switch cover assy ♦ 9900435028 Terminal ♦ 9709683408 Main PCB ♦ 9900565060 Thermistor assy (Outdoor temp.) ♦ 9900727116 Thermistor assy ♦...
Page 40 ¢ Compressor - (02-14) - 3-2. Model: AOYG24KBTB 3. Outdoor unit parts list...
Page 41 Item no. Part no. Part name Service part 9810521002 Compressor assy ♦ 9383129025 4-way valve assy ♦ 9970206009 Solenoid ♦ 9970173028 Expansion valve coil ♦ 9322463029 Pulse motor valve assy ♦ 9322474001 2-way valve assy ♦ 9387831016 3-way valve assy ♦...
Page 42 3-3. Models: AOYG30KBTB and AOYG36KBTB ¢ Exterior parts and chassis - (02-16) - 3-3. Models: AOYG30KBTB and AOYG36KBTB 3. Outdoor unit parts list...
Page 43 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 ♦ 9383879005 Rear pipe cover ♦...
Page 44 ¢ Compressor - (02-18) - 3-3. Models: AOYG30KBTB and AOYG36KBTB 3. Outdoor unit parts list...
Page 45 Item no. Part no. Part name Service part 9380516064 S-ABS (top) ♦ 9900565091 Thermistor (Outdoor temp.) ♦ 9900186029 Pressure switch ♦ 9374425631 4-way valve assy ♦ 9970194016 Solenoid ♦ 9970158018 Sensor ♦ 9384848017 Accumulator assy (service) ♦ 9970209000 Expansion valve coil ♦...
Page 46 3-4. Model: AOYG45KBTB ¢ Exterior parts and chassis - (02-20) - 3-4. Model: AOYG45KBTB 3. Outdoor unit parts list...
Page 47 Item no. Part no. Part name Service part 9383880001 Top panel assy ♦ 9381013005 Protective net ♦ 9375361013 Net rubber ♦ 9900984038 Thermistor (Heat exchanger) ♦ 9900727154 Thermistor assy ♦ 9383607004 Thermo holder ♦ 9383874017 Right panel sub assy ♦ 9383879005 Rear pipe cover ♦...
Page 48 ¢ Compressor - (02-22) - 3-4. Model: AOYG45KBTB 3. Outdoor unit parts list...
Page 49 Item no. Part no. Part name Service part 9380516019 S-ABS (top) ♦ 9900565091 Thermistor (Outdoor temp.) ♦ 9900186029 Pressure switch ♦ 9374425624 4-way valve assy ♦ 9970194016 Solenoid ♦ 9970158018 Sensor ♦ 9384848000 Accumulator assy (Service) ♦ 9970209000 Expansion valve coil ♦...
Page 50 4. Accessories 4-1. Indoor unit ¢ Models: ABYG18KRTA and ABYG22KRTA Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Insulation Operating manual Drain hose (CD-ROM) Installation manual Hose band Template Cable tie (large) M10 nut A Cable tie (small)
Page 51 ¢ Models: ABYG24KRTA, ABYG30KRTA, ABYG36KRTA and ABYG45KRTA Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Insulation Operating manual Drain hose (CD-ROM) Installation manual Hose band Template Cable tie (large) M10 nut A Cable tie (small) (with flange) M10 nut B Remote controller cable (with spring lock hole cap...
Page 52 5. Optional parts 5-1. Indoor unit ¢ Controllers Exterior Part name Model name Summary Easy finger touch operation with LCD Wired remote panel. Backlit LCD enables easy UTY-RNRYZ* controller operation in a dark room. Wire type: Non-polar 2-wire High visibility and easy operation. Room temperature can be accurately Wired remote controlled using the built-in thermo...
Page 53 ¢ Others Exterior Part name Model name Summary Optional drain lift-up mechanism Drain pump unit UTR-DPB24T allows more flexible installation. For piping of upward direction only. Auxiliary pipe UTP-FX24A • For liquid: 6.35 mm (1/4 in) assembly • For gas: 12.70 mm (1/2 in) For piping of upward direction only.
Page 54 Exterior Part name Model name Summary For connection between indoor unit KNX converter UTY-VKSX with UART interface and a KNX open network. This converter is required when Split system UTY-VTGX connecting single split system to VRF converter network system. Split system This converter is required when converter UTY-VTGXV...
Page 55 6. Refrigerant system diagrams 6-1. Model: AOYG18KBTB Heat exchanger 3-way (INDOOR) valve 2-way valve Muffler Muffler Strainer 4-way valve Expansion valve Accumulator Heat exchanger Strainer (OUTDOOR) Cooling Heating : Thermistor (Discharge temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat exchanger out temperature) : Thermistor (Heat exchanger middle temperature) : Thermistor (Room temperature) : Thermistor (Pipe temperature)
Page 56 6-2. Model: AOYG22KBTB Heat exchanger 3-way (INDOOR) valve 2-way Muffler valve Muffler Pressure switch 4-way valve Strainer Expansion valve Accumulator Heat exchanger Strainer (OUTDOOR) Cooling Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat exchanger out temperature) : Thermistor (Heat exchanger middle temperature) : Thermistor (Room temperature) : Thermistor (Pipe temperature)
Page 57 6-3. Models: AOYG24KBTB and AOYG30KBTB Heat exchanger 3-Way ( INDOOR ) valve 2-Way valve Pressure switch 4-Way valve Strainer Expansion valve Heat exchanger Strainer ( OUTDOOR ) : Cooling : Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Heat Exchanger Med temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat Exchanger Out temperature) : Thermistor (Room temperature)
Page 58 6-4. Models: AOYG36KBTB and AOYG45KBTB Heat exchanger 3-Way ( INDOOR ) valve 2-Way valve Pressure switch Pressure sensor 4-Way valve Strainer Expansion valve Heat exchanger Strainer ( OUTDOOR ) : Cooling : Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Heat Exchanger Med temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat Exchanger Out temperature)
Page 59 7. Wiring diagrams 7-1. Indoor unit ¢ Models: ABYG18KRTA, ABYG22KRTA, ABYG24KRTA and ABYG30KRTA - (02-33) - 7-1. Indoor unit 7. Wiring diagrams...
Page 60 ¢ Models: ABYG36KRTA and ABYG45KRTA - (02-34) - 7-1. Indoor unit 7. Wiring diagrams...
Page 61 7-2. Outdoor unit ¢ Model: AOYG18KBTB ¢ Models: AOYG22KBTB and AOYG24KBTB - (02-35) - 7-2. Outdoor unit 7. Wiring diagrams...
Page 62 ¢ Model: AOYG30KBTB ¢ Model: AOYG36KBTB - (02-36) - 7-2. Outdoor unit 7. Wiring diagrams...
Page 63 ¢ Model: AOYG45KBTB - (02-37) - 7-2. Outdoor unit 7. Wiring diagrams...
Page 64 8. PC board diagrams 8-1. Models: ABYG18KRTA, ABYG22KRTA, ABYG24KRTA, and ABYG30KRTA CONTROL UNIT 18 model: EZ-019GHSE 22 model: EZ-019HHSE 24 model: EZ-019KHSE 30 model: EZ-019LHSE EMI FILTER ZCAT1518-0730 CN8 Thermistor Characteristics. TERMINAL DC12V 2 TURNS Temperature REMOTE CONTROLLER ( 20...
Page 65 8-2. Models: ABYG36KRTA and ABYG45KRTA CONTROL UNIT 36 model: EZ-019MHSE 45 model: EZ-019PFHSE CN8 Thermistor Characteristics. EMI FILTER ZCAT1518-0730 Temperature TERMINAL ( 20 ( 30 2 TURNS DC12V Thermistor REMOTE CONTROLLER UL1007 AWG22 14-1 33.62 k 12.54 k 8.04 k Thermistor ( Room temp.
Page 66 8-3. Model: AOYG18KBTB INVERTER ASSEMBLY 12 model: EZ-018SHUE 14 model: EZ-018THUE 18 model: EZ-018THUE EMI FILTER KRFC-13 EMI FILTER EMI FILTER 2 TURNS KRFC-13 KRFC-13 TO INDOOR UNIT 2 TURNS 1 TURN UL3271 AWG16 W400 UL1015 AWG20 UL3271 AWG16 W103 BLACK W401 WHITE...
Page 67 8-4. Model: AOYG22KBTB INVERTER ASSEMBLY EZ-0118YHUE EMI FILTER KRFC-13 EMI FILTER EMI FILTER 2 TURNS KRFC-13 KRFC-13 TO INDOOR UNIT 2 TURNS 1 TURN UL3271 AWG16 W400 UL1015 AWG20 UL3271 AWG16 W103 BLACK W401 WHITE WHITE COMPRESSOR UL3271 AWG16 UL1015 AWG20 Compressor W402 BLACK...
Page 68 8-5. Model: AOYG24KBTB INVERTER ASSEMBLY EZ-01801HUE EMI FILTER KRFC-13 EMI FILTER EMI FILTER 2 TURNS KRFC-13 KRFC-13 TO INDOOR UNIT 2 TURNS 1 TURN UL3271 AWG16 W400 UL1015 AWG20 UL3271 AWG16 W103 BLACK W401 WHITE WHITE COMPRESSOR UL3271 AWG16 UL1015 AWG20 Compressor W402 BLACK...
Page 69 8-6. Models: AOYG30KBTB, AOYG36KBTB, and AOYG45KBTB INVERTER ASSEMBLY EZ-0190DHUE 36 model : P700 Thermistor Characteristics. EZ-0193KHUE 45 model : Temperature Thermistor 0.33 k 0.12 k 0.08 k Thermistor ( Heatsink temp. ) 4.10 4.62 4.75 UL1015 5V-1 AWG20 GREEN BLACK P700 THERMISTOR ( HEATSINK TEMP.
Page 70 - (02-44) - 8-6. Models: AOYG30KBTB, AOYG36KBTB, and AOYG45KBTB 8. PC board diagrams...
Page 71 3. TROUBLESHOOTING 2020.07.01 SR_CH03_AB004EF_01...
Page 72 CONTENTS 3. TROUBLESHOOTING 1. Error code ....................03-1 1-1. Error code table (Wired remote controller)..............03-1 1-2. Error code table (Outdoor unit: for 36 model only)............03-2 2. Troubleshooting with error code ...............03-3 2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit).....03-3 2-2.
Page 73: Table Of Contents
CONTENTS (continued) 4. Service parts information .................03-46 4-1. Compressor ........................03-46 4-2. Inverter compressor......................03-47 4-3. Outdoor unit Electronic Expansion Valve (EEV) ............03-51 4-4. Indoor unit fan motor ....................03-55 4-5. Outdoor unit fan motor....................03-56 4-6. Pressure switch ......................03-57 4-7. 4-way valve coil (solenoid coil)/4-way valve ..............03-58 4-8.
Page 75 1. Error code 1-1. Error code table (Wired remote controller) The operation, timer, and economy indicators operate according to the error contents. For confirmation of the error contents, refer the flashing pattern as follows. Wired remote Error contents controller display E: 11.
Page 76 1-2. Error code table (Outdoor unit: for 36 model only) The operation status is determined by the lighting up and blinking of the LED lamp. After check that ERROR LED lamp blinks, press the ENTER button once. NOTE: For the positions of LED lamp and buttons, refer to "Functionsettings (for outdoor unit)" in Chapter 5.
Page 77: E: 11. Serial Communication Error (Serial Reverse Transfer Error) (Outdoor Unit)
2. Troubleshooting with error code 2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit) Wired remote Indicator Error code E: 11 controller Main PCB When the indoor unit cannot receive the serial signal from outdoor unit more than 2 minutes after power on, Detective actuator Outdoor unit or the indoor unit cannot receive the serial signal more...
Page 78 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 79: E: 11. Serial Communication Error (Serial Forward Transfer Error) (Indoor Unit)
2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit) Wired remote Indicator Error code E: 11 controller When the outdoor unit cannot receive the serial signal Detective actuator Indoor unit Main PCB from indoor unit more than 10 seconds. Connection failure Forecast of cause External cause...
Page 80 Check point 4. Check serial signal (Forward transfer signal) Check serial signal (Forward transfer signal) BLACK WHITE BLACK WHITE • Check if indicated value swings between AC 30 V and AC 130 V at outdoor unit terminal 2—3. • If it is abnormal, replace main PCB. ↓...
Page 81: E: 12. Wired Remote Controller Communication Error (Indoor Unit)
2-3. E: 12. Wired remote controller communication error (Indoor unit) Wired remote Indicator Error code E: 12 controller Indoor unit Main PCB When the indoor unit cannot receive the signal from Detective actuator Wired remote controller more than 1 minute during Wired remote control normal operation.
Page 82: E: 15. Automatic Air Flow Adjustment Error (Indoor Unit)
2-4. E: 15. Automatic air flow adjustment error (Indoor unit) Wired remote Indicator Error code E: 15 controller • On automatic airflow adjustment operation, when the fan speed other than 0rpm is detected at the 0rpm operation. • On automatic airflow adjustment operation, when Detective actuator Indoor unit Main PCB...
Page 83: E: 22. Indoor Unit Capacity Error (Indoor Unit)
2-5. E: 22. Indoor unit capacity error (Indoor unit) When the total capacity of the indoor units does not Detective actuator Indoor unit main PCB match outdoor unit capacity while 3 minutes after power Indoor unit selection is incorrect. Forecast of cause Main PCB failure Check point 1.
Page 84: E: 23. Combination Error (Outdoor Unit)
2-6. E: 23. Combination error (Outdoor unit) Wired remote Indicator Error code E: 23 controller Detective actuator Indoor unit • When the outdoor unit type is multi type Forecast of cause Incorrect indoor unit is selected. Check point 1. Check the type of indoor unit •...
Page 85: E: 32. Indoor Unit Main Pcb Error (Indoor Unit)
2-7. E: 32. Indoor unit main PCB error (Indoor unit) Wired remote Indicator Error code E: 32 controller When power is on and there is some below case. Detective actuator Indoor unit main PCB 1. When model information of EEPROM is incorrect. 2.
Page 86: E: 33. Indoor Unit Motor Electricity Consumption Detection Error (Indoor Unit)
2-8. E: 33. Indoor unit motor electricity consumption detection error (Indoor unit) Wired remote Indicator Error code E: 33 controller Indoor unit motor electricity When the voltage value or the current value of the motor Detective actuator consumption detection go beyond the limits Fan motor failure Forecast of cause Main PCB failure...
Page 87: E: 35. Manual Auto Button Error (Indoor Unit)
2-9. E: 35. MANUAL AUTO button error (Indoor unit) Wired remote Indicator Error code E: 35 controller Indoor unit controller PCB When the MANUAL AUTO button becomes on for Detective actuator Indicator PCB consecutive 60 or more seconds. Manual auto switch MANUAL AUTO button failure Forecast of cause Controller PCB and indicator PCB failure...
Page 88: E: 39. Indoor Unit Power Supply Error For Fan Motor (Indoor Unit)
2-10. E: 39. Indoor unit power supply error for fan motor (Indoor unit) Wired remote Indicator Error code E: 39 controller • When a momentary power cut off Detective actuator Indoor unit main PCB • When do not start fan motor External cause Forecast of cause Connector connection failure...
Page 89: E: 41. Room Temperature Sensor Error (Indoor Unit)
2-11. E: 41. Room temperature sensor error (Indoor unit) Wired remote Indicator Error code E: 41 controller Indoor unit main PCB Room temperature thermistor is open or short is Detective actuator detected always. Room temperature thermistor Connector failure Forecast of cause Thermistor failure Main PCB failure Check point 1.
Page 90: E: 42. Indoor Unit Heat Exchanger Sensor Error (Indoor Unit)
2-12. E: 42. Indoor unit heat exchanger sensor error (Indoor unit) Wired remote Indicator Error code E: 42 controller Indoor unit main PCB When heat exchanger temperature thermistor open or Detective actuator Heat exchanger temperature short circuit is detected. thermistor Connector connection failure Forecast of cause Thermistor failure...
Page 91: E: 51. Indoor Unit Fan Motor Error (Indoor Unit)
2-13. E: 51. Indoor unit fan motor error (Indoor unit) Wired remote Indicator Error code E: 51 controller main PCB When the condition that actual frequency of indoor fan is Detective actuator Indoor unit below 1/3 of target frequency is continued more than 56 Fan motor seconds.
Page 92: E: 53. Drain Pump Error (Indoor Unit)
2-14. E: 53. Drain pump error (Indoor unit) Wired remote Indicator Error code E: 53 controller Indoor unit main PCB Detective actuator When Float switch is ON for more than 3 minutes. Float switch Float switch failure Shorted connector/wire failure Forecast of cause Main PCB failure Drain pump failure...
Page 93: E: 57. Damper (Open/Close) Detection Limit Switch Error
2-15. E: 57. Damper (Open/Close) detection limit switch error Wired remote Indicator Error code E: 57 controller Indoor unit main PCB • When limit switch were not able to detect the close though the damper close.(Upper air flow) Limit switch Detective actuator •...
Page 94: E: 58. Intake Grille Error (Indoor Unit)
2-16. E: 58. Intake grille error (Indoor unit) Wired remote Indicator Error code E: 58 controller Indoor unit main PCB When the Micro switch is detected open while running Detective actuator the compressor. Micro switch Micro switch failure Forecast of cause Shorted connector/wire Main PCB failure Check point 1.
Page 95: E: 62. Outdoor Unit Main Pcb Error (Outdoor Unit)
2-17. E: 62. Outdoor unit main PCB error (Outdoor unit) Wired remote Indicator Error code E: 62 controller Access to EEPROM failed due to some cause after Detective actuator Outdoor unit Main PCB outdoor unit started. External cause (Noise, temporary open, voltage drop) Forecast of cause Main PCB failure Check point 1.
Page 96: E: 63. Inverter Error (Outdoor Unit)
2-18. E: 63. Inverter error (Outdoor unit) Wired remote Indicator Error code E: 63 controller Detective actuator Outdoor unit Inverter PCB Error information received from inverter PCB Forecast of cause External cause Power supply to inverter PCB wiring disconnection or open Inverter PCB failure Check point 1.
Page 97: E: 64. Pfc Circuit Error (Outdoor Unit)
2-19. E: 64. PFC circuit error (Outdoor unit) Wired remote Indicator Error code E: 64 controller • When inverter input DC voltage is higher than 425 V or lower than 80 V Detective actuator Outdoor unit Main PCB • If the same operation is repeated 5 times, the compressor stops permanently.
Page 98: E: 65. Trip Terminal L Error (Outdoor Unit)
2-20. E: 65. Trip terminal L error (Outdoor unit) Wired remote Indicator Error code E: 65 controller When the signal from FO terminal (13—15) of IPM is “L” Detective actuator Outdoor unit Main PCB (0 V) during the compressor stopping. Forecast of cause Main PCB failure Check point 1.
Page 99: E: 71. Discharge Thermistor Error (Outdoor Unit)
2-21. E: 71. Discharge thermistor error (Outdoor unit) Wired remote Indicator Error code E: 71 controller Outdoor unit main PCB When discharge pipe temperature thermistor open or Detective actuator short circuit is detected at power on or while running the Discharge pipe temperature compressor thermistor...
Page 100: E: 73. Heat Exchanger (Middle/Outlet) Temperature Thermistor Error (Outdoor Unit)
2-22. E: 73. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor unit) Wired remote Indicator Error code E: 73 controller Heat exchanger liquid temperature • Heat exchanger liquid temperature thermistor short thermistor or open detected Detective actuator Heat exchanger middle • Heat exchanger middle temperature thermistor temperature thermistor short or open detected...
Page 101: E: 74. Outdoor Temperature Thermistor Error (Outdoor Unit)
2-23. E: 74. Outdoor temperature thermistor error (Outdoor unit) Wired remote Indicator Error code E: 74 controller Outdoor unit main PCB When outdoor temperature thermistor open or short Detective actuator circuit is detected at power on or while running the Outdoor temperature thermistor compressor Connector failure...
Page 102: E: 84. Current Sensor Error (Outdoor Unit)
2-24. E: 84. Current sensor error (Outdoor unit) Wired remote Indicator Error code E: 84 controller When input current sensor has detected 0 A, while inverter compressor is operating at higher than 50 rps, Detective actuator Outdoor unit main PCB after 1 minute upon starting the compressor.
Page 103: E: 86. High Pressure Switch Error (Outdoor Unit)
2-25. E: 86. High pressure switch error (Outdoor unit) Wired remote Indicator Error code E: 86 controller Outdoor unit main PCB When pressure switch open is detected in 10 seconds Detective actuator after the power is turned on. High pressure switch High pressure switch connector disconnection or open Forecast of cause High pressure switch characteristics failure...
Page 104: E: 94. Trip Detection (Outdoor Unit)
2-26. E: 94. Trip detection (Outdoor unit) Wired remote Indicator Error code E: 94 controller Inverter PCB Protection stop by over-current generation after inverter compressor start processing completed generated Main PCB consecutively 10 times. Detective actuator Outdoor unit NOTE: The number of generations is reset when the Compressor compressor starts up.
Page 105: E: 95. Compressor Motor Control Error (Outdoor Unit)
2-27. E: 95. Compressor motor control error (Outdoor unit) Wired remote Indicator Error code E: 95 controller Main PCB "Protection stop by "overcurrent generation at inverter Detective actuator Outdoor unit compressor starting" restart" generated consecutively 50 Compressor times x 3 sets (total 150 times) Defective connection of electric components Forecast of cause Main PCB failure...
Page 106: E: 97. Outdoor Unit Fan Motor Error (Outdoor Unit)
2-28. E: 97. Outdoor unit fan motor error (Outdoor unit) Wired remote Indicator Error code E: 97 controller Main PCB 1. When outdoor fan rotation speed is less than 100 rpm in 20 seconds after fan motor starts, fan motor stops.
Page 107: E: 99. 4-Way Valve Error (Outdoor Unit)
2-29. E: 99. 4-way valve error (Outdoor unit) Wired remote Indicator Error code E: 99 controller Indoor unit main PCB When the indoor heat exchanger temperature is compared with the room temperature, and either Heat exchanger temperature following condition is detected continuously two times, thermistor the compressor stops.
Page 108 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 03-46. • Solenoid coil Remove from PCB and check the resistance value of coil. Resistance value is 2.1 kΩ°C). →...
Page 109 2-30. E: A1. Discharge temperature error (Outdoor unit) Wired remote Indicator Error code E: A1 controller Outdoor unit main PCB Protection stop by discharge temperature ≥ 110 °C Detective actuator during compressor operation generated 2 times within Discharge temperature thermistor 24 hours.
Page 110 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. ↓ - (03-36) - 2-30. E: A1. Discharge temperature error (Outdoor unit) 2.
Page 111 2-31. E: A5. Low pressure error (Outdoor unit) Wired remote Indicator Error code E: A5 controller Outdoor unit main PCB Protection stop by suction pressure ≥ 0.02 MPaG Detective actuator continued 5 minutes repeats 5 times within 24 hours. Suction pressure sensor 3-way valve not opened Outdoor unit ambient temperature too low Outdoor unit operation failure, foreign matter on heat...
Page 112 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. ↓ - (03-38) - 2-31. E: A5. Low pressure error (Outdoor unit) 2.
Page 113 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 114 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 115 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 116 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 117 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 118 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 119 3-6. Water leaking Erroneous installation Forecast of cause Drain hose failure Diagnosis method when water is spitting Diagnosis method when water leak occurs • Is main unit installed in stable condi- tion? Is the filter clogged? • Is main unit broken or deformed at the time of transportation or maintenance? ↓...
Page 120: 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 121: Inverter Compressor
4-2. Inverter compressor ¢ Model: AOYG18KBTB 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 122 ¢ Models: AOYG22KBTB and AOYG24KBTB 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...
Page 123 ¢ Models: AOYG30KBTB and AOYG36KBTB Check point 1. Check connection • Check terminal connection of compressor (loose or incorrect wiring) C (W) S(V) (BLACK) (WHITE) Main PCB R(U) (RED) • Check terminal connection of main PCB (loose or incorrect wiring) Main PCB W400(U) W401(V) W402(W)
Page 124 ¢ Model: AOYG45KBTB Check point 1. Check connection • Check terminal connection of compressor (loose or incorrect wiring) C (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...
Page 125: Outdoor Unit Electronic Expansion Valve (Eev)
4-3. Outdoor unit Electronic Expansion Valve (EEV) ¢ Models: AOYG18KBTB, AOYG22KBTB, and AOYG24KBTB Check point 1. Check connections Check connection of connector. (Loose connector or open cable) NOTE: For details of wiring diagram, refer to "Wiring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-33.
Page 126 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 127 ¢ Models: AOYG30KBTB, AOYG36KBTB, and AOYG45KBTB Check point 1. Check connections Check connection of connector. (Loose connector or open cable) NOTE: For details of wiring diagram, refer to "Wiring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-33. Check point 2.
Page 128 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 129: Indoor Unit Fan Motor
4-4. Indoor unit fan motor ¢ Models: ABYG18KRTA, ABYG22KRTA, ABYG24KRTA, ABYG30KRTA, ABYG36KRTA and ABYG45KRTA 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) →...
Page 130: Outdoor Unit Fan Motor
4-5. Outdoor unit fan motor ¢ Models: AOYG18KBTB, AOYG22KBTB, AOYG24KBTB, AOYG30KBTB, AOYG36KBTB, and AOYG45KBTB 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) →...
Page 131: Pressure Switch
4-6. Pressure switch ¢ Models: AOYG30KBTB, AOYG36KBTB, and AOYG45KBTB • 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 30/36/45 model: P770 - (03-57) - 4-6.
Page 132: 4-Way Valve Coil (Solenoid Coil)/4-Way Valve
4-7. 4-way valve coil (solenoid coil)/4-way valve ¢ Models: ABYG18KRTA, ABYG22KRTA, ABYG24KRTA, ABYG30KRTA, ABYG36KRTA and ABYG45KRTA 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.
Page 133: Discharge Pressure Sensor
4-8. Discharge pressure sensor ¢ Models: AOYG36KBTB and AOYG45KBTB Check point 1. Check voltage from main PCB With the connector connected to the PCB, measure the voltage between P20:2-3 of the Main PCB. PRESSURE WHITE SENSOR BLACK (HIGH) Characteristics of pressure sensor 725 / 5.0 Pressure psi / MPa 14.5...
Page 134: Thermistor Resistance Values
5. Thermistor resistance values 5-1. Indoor unit ¢ Room temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -10.0 58.25 0.73 -5.0 44.03 0.93 33.62 1.15 25.92 1.39 10.0 20.17 1.66 15.0 15.84 1.94 20.0 12.54 2.22 25.0 10.00 2.50 30.0 8.04 2.77 35.0...
Page 135: Outdoor Unit
5-2. Outdoor unit ¢ Heatsink thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 94.26 0.08 -25.0 67.95 0.11 -20.0 49.62 0.15 -15.0 36.68 0.20 -10.0 27.42 0.26 -5.0 20.73 0.34 15.83 0.43 12.21 0.55 10.0 9.50 0.68 15.0 7.46 0.84 20.0 5.90 1.01...
Page 136 ¢ Discharge temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 1,013.11 0.06 -25.0 729.09 0.09 -20.0 531.56 0.12 -15.0 392.31 0.16 -10.0 292.91 0.21 -5.0 221.09 0.28 168.60 0.36 129.84 0.46 10.0 100.91 0.57 15.0 79.12 0.71 20.0 62.55 0.86 25.0 49.84...
Page 137 ¢ Heat exchanger temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 95.58 0.24 -25.0 68.90 0.32 -20.0 50.31 0.43 -15.0 37.19 0.57 -10.0 27.81 0.73 -5.0 21.02 0.92 16.05 1.14 12.38 1.39 10.0 9.63 1.65 15.0 7.56 1.93 20.0 5.98 2.21 25.0...
Page 138 - (03-64) - 5-2. Outdoor unit 5. Thermistor resistance values...
Page 139 4. CONTROL AND FUNCTIONS 2020.07.01 SR_CH04_AB004EF_01...
Page 140 CONTENTS 4. CONTROL AND FUNCTIONS 1. Compressor frequency control..............04-1 1-1. Cooling operation ......................04-1 1-2. Heating operation ......................04-4 1-3. Dry operation ........................04-5 1-4. Compressor frequency at normal start-up ..............04-6 1-5. Compressor frequency limitation by outdoor temperature ..........04-9 2. Auto changeover operation..............04-13 3.
Page 141 CONTENTS (continued) 8-8. High temperature and high pressure release control ............04-42...
Page 143: Compressor Frequency Control
• Compressor frequency range Model name Minimum frequency Maximum frequency ABYG18KRTA 8 rps 104 rps ABYG22KRTA 10 rps 106 rps...
Page 144 • Limit of maximum speed based on outdoor temperature Outdoor temperature rises Outdoor temperature drops 36°C A zone 34°C 32°C B zone 30°C 21°C C zone 19°C 12°C D zone 10°C 2°C E zone 0°C F zone Unit: rps - (04-2) - 1-1.
Page 145 Outdoor Indoor unit fan mode Model name temperature HIGH QUIET zone A zone B zone C zone ABYG18KRTA D zone E zone F zone A zone B zone C zone ABYG22KRTA D zone E zone F zone A zone B zone...
Page 146: Heating Operation
• When the room temperature is within the range of +1.0°C to -6.0°C of the setting temperature, the compressor frequency is controlled within the range shown below. • Compressor frequency range Model name Minimum frequency Maximum frequency ABYG18KRTA ABYG22KRTA ABYG24KRTA ABYG30KRTA ABYG36KRTA ABYG45KRTA - (04-4) - 1-2.
Page 147: Dry Operation
Zone is defined by set temperature and room temperature. • Compressor frequency range Unit: rps Model name Outdoor temperature zone Operating frequency X zone ABYG18KRTA J zone Y zone X zone ABYG22KRTA J zone Y zone X zone...
Page 148: Compressor Frequency At Normal Start-Up
1-4. Compressor frequency at normal start-up ¢ Model: AOYG18KBTB Compressor frequency soon after starting is controlled as below. Frequency V Frequency IV Frequency III Frequency II Frequency I Time 1 Time 2 Time 3 Time 4 Time 5 Frequency (rps) Time (sec) ¢...
Page 149 ¢ Models: AOYG30KBTB and AOYG36KBTB Compressor frequency soon after starting is controlled as below. Frequency VIII Frequency VII Frequency VI Frequency V Frequency IV Frequency III Frequency II Frequency I Time 1 Time 2 Time 3 Time 4 Time 5 Time 6 Time 7 Time 8...
Page 150 ¢ Model: AOYG45KBTB Compressor frequency soon after starting is controlled as below. Frequency X Frequency IX Frequency VIII Frequency VII Frequency VI Frequency V Frequency IV Frequency III Frequency II Frequency I Time 1 Time 2 Time 3 Time 4 Time 5 Time 6 Time 7...
Page 151: Compressor Frequency Limitation By Outdoor Temperature
1-5. Compressor frequency limitation by outdoor temperature ¢ Models: AOYG18KBTB, AOYG22KBTB, and AOYG24KBTB The minimum compressor frequency is limited by outdoor temperature as below. • Cooling/Dry mode F zone 38°C E zone 19°C D zone 10°C C zone 0°C B zone -10°C A zone Limitation of compressor...
Page 152 • Heating mode F zone 19°C E zone 5°C D zone 0°C C zone -15°C B zone -25°C A zone Limitation of compressor Model name Outdoor temperature zone frequency A zone 25 rps B zone 25 rps C zone 17 rps AOYG18KBTB D zone 10 rps...
Page 153 ¢ Models: AOYG30KBTB, AOYG36KBTB, and AOYG45KBTB The minimum compressor frequency is limited by outdoor temperature as below. • Cooling/Dry mode K zone 52°C J zone 50°C I zone 46°C H zone 31°C G zone 21°C F zone 13°C E zone 7°C D zone °C...
Page 154 • Heating mode I zone 20°C H zone 16°C G zone 12°C F zone 7°C E zone 2°C D zone -7°C C zone -10°C B zone -15°C A zone Limitation of compressor Model name Outdoor temperature zone frequency A zone 58 rps B zone 52 rps...
Page 155: Auto Changeover Operation
2. Auto changeover operation When the air conditioner is set to AUTO mode by remote controller, operation starts in the optimum mode from among heating, cooling, dry and monitoring modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set be- tween 18°C and 30°C in 1.0°C steps.
Page 156 Operation flow chart Start Ts: Setting temperarure Monitor mode Room temp. > Ts+2°C? Room temp. < Ts-2°C? Middle zone Auto change over is second or more? Operation mode before the monitor mode is cooling mode? Operation mode of Heating operation Cooling operation outdoor unit: Cooling? Thermostat remains...
Page 157: 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 HIGH 1,020 1,090 1,090 1,120 MED+ 1,000 1,020 1,030 LOW- Heating QUIET Cool air prevention...
Page 158 ¢ 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 159 • 10 °C HEAT operation Indoor heat exchanger Indoor heat exchanger temperature rises temperature drops AUTO 39°C 34°C ¢ Moisture return prevention control (cooling and dry mode) Switch the airflow AUTO at cooling mode, and the indoor fan motor will run as shown below. Compressor Indoor fan setting airflow...
Page 160: 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: AOYG18KBTB Fan speed is defined by outdoor temperature and compressor frequency. •...
Page 161  Model: AOYG22KBTB Fan speed is defined by outdoor temperature and compressor frequency. • Outside air temperature zone selection Outside air Outside air temperature rises temperature drops Y zone 21°C 19°C Z zone 12°C 10°C F zone 2°C 0°C G zone -8°C -10°C H zone...
Page 162  Model: AOYG24KBTB Fan speed is defined by outdoor temperature and compressor frequency. • Outside air temperature zone selection Outside air Outside air temperature rises temperature drops Y zone 21°C 19°C Z zone 12°C 10°C F zone 2°C 0°C G zone -8°C -10°C H zone...
Page 163  Models: AOYG30KBTB and AOYG36KBTB Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry Heating — — — S-HIGH — • When the compressor frequency increases, the outdoor fan speed also changes to the higher speed.
Page 164  Model: AOYG45KBTB Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry Heating — — — S-HIGH — • When the compressor frequency increases, the outdoor fan speed also changes to the higher speed.
Page 165: Louver Control
4. Louver control 4-1. Vertical airflow direction louver control Each time the button is pressed, the air direction range will change as below: • Remote controller display is not changed. • Vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.
Page 166: Timer Operation Control
5. Timer operation control 5-1. Wireless remote control On/Off timer Program timer Sleep timer Weekly timer ○ ○ ○ — ¢ On/Off timer • Off timer: When the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
Page 167 ¢ 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 168: Wired Remote Control
5-2. Wired remote control Temperature set On/Off timer Program timer Sleep timer Weekly timer back timer ○ ○ ○ ○ ○ ¢ On/Off timer • Off timer: When the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
Page 169 ¢ 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 170 ¢ 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 171: 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 172: Defrost Operation In Heating Operation Stopped
Release condition • The defrost operation is released when either one of the conditions below is satisfied. 18/22/24 model 13°C or more Outdoor unit heat exchanger temperature (after 1 minute or later since compressor start) 30/36/45 model 12°C or more Compressor operation time 15 minutes 6-1.
Page 173: Various Control
7. Various control 7-1. Auto restart When the power was interrupted by a power failure etc. during operation, the operation contents at that time are memorized and when the power is recovered, operation is automatically started with the memorized operation contents. Operation contents memorized when the power is interrupted Operation mode Setting temperature...
Page 174: Fresh Air Control
7-5. Fresh air control The fan motor for Fresh Air is operated in synchronization with the indoor fan operation as below. Operation Fan motor (Indoor unit) Stop Operation Fan motor (for Fresh Air) Stop 7-6. Compressor preheating By preheating the compressor, warm airflow is quickly discharged when the operation is started. •...
Page 175: External Electrical Heater Control
7-7. External electrical heater control The external electrical heater is operated as below. When the room Ts: Setting temperature temperature rises Heater : Off Ts -1°C Ts -3°C Heater : On Ts -10°C Ts -12°C Heater : Off When the room temperature drops NOTES: •...
Page 176: Drain Pump Control
7-9. Drain pump control ¢ Drain control for cooling operation  During the compressor in operation • Triggering condition The thermostat is turned on during cooling or dry mode. • Operation details The drain pump is turned on. • Release condition –...
Page 177  Overflow control • Triggering condition The float switch is turned on. • Operation details – The drain pump is turned on. – When the operation mode is cooling or dry, operate the followings. • The compressor is stopped. • Then indoor fan control is turned off. •...
Page 178: Prevention To Restart For 3 Minutes (3 Minutes St)
7-10. Prevention to restart for 3 minutes (3 minutes st) When the compressor fails to start for the number of times below, it does not enter operation status for 3 minutes. 18/22/24 model Retry number 30/36/45 model Retry set number When the compressor fails to start in the retry set number above, the compressor is stopped.
Page 179: Peak Cut Operation(For 30/36/45 Model)
7-13. Peak cut operation(for 30/36/45 model) 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 180: Various Protections
8. Various protections 8-1. Discharge gas temperature over-rise prevention control The discharge gas temperature sensor (discharge thermistor: outdoor unit side) detects the dis- charge gas temperature. • When the discharge temperature becomes higher than the trigger condition, the compressor fre- quency is decreased as the table below, and it continues to decrease until the discharge tempera- ture becomes lower than the trigger condition.
Page 181: Current Release Control
8-3. Current release control The compressor frequency is controlled so that the outdoor unit input current does not exceeds cur- rent limit value set according to the outdoor temperature. The compressor frequency returns according to the operation mode, when the current becomes low- er than the release value.
Page 182: Indoor Unit Fan Motor Over Temperature Protection
¢ Models: AOYG30KBTB and AOYG36KBTB Operation mode Outdoor temp. (Ta) Trigger condition Release condition 52°C ≤ Ta 8.0 A 7.5 A 50°C ≤ Ta < 52°C 12.0 A 11.5 A Cooling 42°C ≤ Ta < 50°C 14.0 A 13.5 A 2°C ≤...
Page 183: Compressor Temperature Protection
8-5. Compressor temperature protection When the compressor temperature sensor detects higher than the trigger condition below, the com- pressor is stopped. When the compressor temperature sensor detects the release condition, the pro- tection is released. Trigger condition 108°C 80°C Release condition (3 minutes after compressor stop) 8-6.
Page 184 8-8. High temperature and high pressure release control The compressor is controlled as follows. ¢ Models: AOYG18KBTB, AOYG22KBTB, and AOYG24KBTB • Cooling mode Indoor unit heat exchanger Indoor unit heat exchanger temperature rises temperature drops 61°C Zone A 60°C 59°C Zone B 54°C Zone C...
Page 185 ¢ Models: AOYG30KBTB, AOYG36KBTB, and AOYG45KBTB • Cooling mode Indoor unit heat exchanger Indoor unit heat exchanger temperature rises temperature drops 64°C Zone A 60°C 58°C Zone B Zone C Stable zone Zone D Zone Operation Zone A Compressor is stopped. Zone B The compressor frequency is decreased.
Page 186 - (04-44) - 8-8. High temperature and high pressure release control 8. Various protections...
Page 187 5. FILED WORKING 2020.07.01 SR_CH05_AB004EF_01...
Page 188 CONTENTS 5. FILED WORKING 1. Function settings (For indoor unit)............05-1 1-1. Function settings by using remote controller ..............05-1 1-2. Function settings on outdoor unit..................05-5...
Page 189 1. Function settings (For indoor unit) To adjust the functions of this product according to the installation environment, various types of function settings are available. NOTE: Incorrect settings can cause a product malfunction. 1-1. Function settings by using remote controller Some function settings can be changed on the remote controller.
Page 190 2) Ceiling height Select the appropriate ceiling height according to the place of installation. Function number Setting value Setting description Factory setting Standard ♦ High ceiling For the specific height for each setting value, refer to “Installation space” in Chapter "Dimensions" on page 1.
Page 191 5) Room temperature control for wired remote controller sensor Depending on the installed environment, correction of the wire remote temperature sensor may be required. Select the appropriate control setting according to the installed environment. To change this setting, set Function 42 to Both “01”. Ensure that the Thermo Sensor icon is displayed on the remote controller screen.
Page 192 8) Remote controller custom code (Only for wireless remote controller) The indoor unit custom code can be changed. Select the appropriate custom code. Function number Setting value Setting description Factory setting ♦ 9) External input control "Operation/Stop" mode or "Forced stop" mode can be selected. Function number Setting value Setting description...
Page 193 12) Switching functions for external output terminal Functions of the external output terminal can be switched. For details, refer to “External input and output”. Function number Setting value Setting description Factory setting Operation status ♦ 01—08 (Setting prohibited) Error status Indoor unit fan operation status External heater 1-2.
Page 194  Switch buttons and the functions LED lamps S134 S133 S132 S131 S130 Switch buttons LED lamp Function or operation method Lights on while power on. (1) POWER/MODE Green Local setting in outdoor unit or error code is displayed with blink. (2) ERROR Blinks during error operation.
Page 195 ¢ Local setting procedure NOTE: Before performing the function setting, be sure to stop the operation of the air conditioner.  Low noise mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of POWER/MODE blinks 9 times, press the ENTER switch but- ton (S132).
Page 196  Peak cut mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of POWER/MODE blinks 9 times, press the ENTER switch but- ton (S132). PUMP POWER LOW NOISE PEAK CUT DOWN...

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Fujitsu ABYG18KRTA Service Manual

Contents (Continued)

Service Parts Information

Thermistor Resistance Values

Control and Functions

1 Compressor Frequency Control

2 Auto Changeover Operation

3 Fan Control

4 Louver Control

5 Timer Operation Control

6 Defrost Operation Control

7 Various Control

8 Various Protections

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