Page 1 AIR CONDITIONER Simultaneous multi SERVICE MANUAL INDOOR AUXG18KVLA × 2 ARXG18KLLAP × 2 ARXG22KMLA × 2 AUXG22KVLA × 2 ARXG18KLLAP × 3 ARXG24KMLA × 2 AUXG24KVLA × 2 AUXG18KVLA × 3 OUTDOOR AOHG36KRTA AOHG45KRTA AOHG54KRTA SR_SM001EG_05 2021.06.15...
Page 2 • Product specifications and design are subject to change without notice for future improvement. • For further details, please check with our authorized dealer. Trademarks ™ FGLair is trademark of Fujitsu General Limited in the United States, other countries or both. ™ Google Play is trademark of Google Inc. ®...
Page 3 CONTENTS 1. GENERAL INFORMATION 2. TECHNICAL DATA AND PARTS LIST 3. TROUBLESHOOTING 4. CONTROL AND FUNCTIONS 5. FILED WORKING...
Page 5 1. GENERAL INFORMATION 2021.05.19 SR_CH01_SM001EG_02...
Page 6 CONTENTS 1. GENERAL INFORMATION 1. Model lineup ....................01-1 2. Specifications....................01-2 2-1. Compact cassette type ....................01-2 2-2. Slim duct type .........................01-3 2-3. Duct type ........................01-4 2-4. Outdoor unit........................01-5 3. Dimensions....................01-8 3-1. Compact cassette type ....................01-8 3-2. Slim duct type .......................01-10 3-3. Duct type ........................01-12 3-4.
Page 7 1. Model lineup Indoor unit Twin Outdoor unit 18 kBtu/h × 2 ARXG18KLLAP AOHG36KRTA AUXG18KVLA Indoor unit Twin Outdoor unit 22 kBtu/h × 2 ARXG22KMLA AOHG45KRTA AUXG22KVLA Indoor unit Twin Triple Outdoor unit 24 kBtu/h × 2 18 kBtu/h × 3...
Page 8 2. Specifications 2-1. Compact cassette type Model name AUXG18KVLA AUXG22KVLA AUXG24KVLA Power supply 3N 400 V ~50 Hz Power supply intake Outdoor unit Available voltage range 342—457 V HIGH Cooling QUIET Airflow rate HIGH Heating QUIET Type × Q'ty Turbo fan × 1...
Page 9 2-2. Slim duct type Model name ARXG18KLLAP Power supply 3N 400 V ~50 Hz Power supply intake Outdoor unit Available voltage range 342—457 V HIGH Cooling QUIET Airflow rate HIGH Heating QUIET Type × Q'ty Sirocco fan × 3 Motor output Recommended static pressure 0 to 90 HIGH...
Page 10 2-3. Duct type Model name ARXG22KMLA ARXG24KMLA Power supply 3N 400 V ~50 Hz Power supply intake Outdoor unit Available voltage range 342—457 V HIGH 1,100 Cooling QUIET Airflow rate HIGH 1,100 Heating QUIET Type × Q'ty Sirocco fan × 2 Motor output Recommended static pressure 30 to 150...
Page 11 3N 400 V ~ 50 Hz Power supply intake Outdoor unit Available voltage range 342—457 V AUXG24KVLA × 2 AUXG18KVLA × 2 AUXG22KVLA × 2 ARXG24KMLA × 2 Indoor unit combination ARXG18KLLAP × 2 ARXG22KMLA × 2 AUXG18KVLA × 3 ARXG18KLLAP ×...
Page 12 Type Inverter heat pump Model name AOHG36KRTA AOHG45KRTA AOHG54KRTA NOTES: • Specifications are based on the following conditions: – Cooling: Indoor temperature of 27 °CDB/19 °CWB, and outdoor temperature of 35 °CDB/24 °CWB. – Heating: Indoor temperature of 20 °CDB/15 °CWB, and outdoor temperature of 7 °CDB/6 °CWB. –...
Page 13 Specifications for ErP Lot10 Model name AOHG36KRTA Cooling Energy efficiency class Heating (Average) Cooling 9.5 (35°C) Pdesign Heating (Average) 8.7 (-10°C) SEER Cooling kWh/kWh SCOP Heating (Average) Annual energy consump- kWh/a tion QHE (Average) 3,044 Cooling Sound power level HIGH dB (A) Heating - (01-7) -...
Page 14 3. Dimensions 3-1. Compact cassette type ¢ Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA Unit: mm Grid type grille Hanging bolt position IR receiver Drain hose View A Ceiling Control Box View B View C a: Ceiling openings Cassette grille (Option [Grid type])
Page 15 ¢ Installation space requirement Unit: mm Strong and durable ceiling or more 1,000 1,000 or more or more 1,800 or more Obstruction Floor Maximum height from floor to ceiling (Unit: mm) Standard 2,700 High ceiling 3,000 3-way direction setting: Unit: mm 100 or more* NOTES: •...
Page 16 3-2. Slim duct type ¢ Model: ARXG18KLLAP Unit: mm Rear view View A Drain port 100 × 8 = 800 Top view Side view Front view Bottom view - (01-10) - 3-2. Slim duct type 3. Dimensions...
Page 17 ¢ Installation space requirement Provide sufficient installation space for product safety. In ceiling-concealed installations: Unit: mm 300 or more Strong and durable ceiling 20 or more Indoor unit Left Right side side 20 or more Service access Ceiling or more or more Floor - (01-11) -...
Page 18 3-3. Duct type ¢ Models: ARXG22KMLA and ARXG24KMLA Unit: mm Front view Side view (L) Side view (R) Top view Rear view • When using a square duct Unit: mm P176 x 6 = 1,044 Ø 3.2 - (01-12) - 3-3.
Page 19 • Bottom air intake hole Unit: mm 1,015 ¢ Installation space requirement Unit: mm 2,500 or more (When no ceiling) 300 or more 150 or more Floor - (01-13) - 3-3. Duct type 3. Dimensions...
Page 20 3-4. Outdoor unit ¢ Model: AOHG36KRTA Unit: mm 35.7 Top view 3 Way valve (Gas) 3 Way valve (Liquid) 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...
Page 21 ¢ Models: AOHG45KRTA and AOHG54KRTA Unit: mm 35.7 Top view 3 Way valve (Liquid) 3 Way valve (Gas) 129.1 Pipe port Ф28 Ф28 85.3 Cable port Pipe port Ф28: Cable port Cable port Pipe port Pipe port Pipe port Front view Side view Rear view 62.6...
Page 22 - (01-16) - 3-4. Outdoor unit 3. Dimensions...
Page 23 2. TECHNICAL DATA AND PARTS LIST 2021.06.15 SR_CH02_SM001EG_04...
Page 24 1. Precautions....................02-1 2. Cassette grille (optional part) parts list.............02-2 2-1. Model: UTG-UFGF-W.....................02-2 3. Indoor unit parts list..................02-6 3-1. Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA .........02-6 3-2. Model: ARXG18KLLAP ....................02-11 3-3. Models: ARXG22KMLA and ARXG24KMLA ..............02-14 4. Outdoor unit parts list................02-18 4-1. Model: AOHG36KRTA....................02-18 4-2.
Page 25 • 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 26 2. Cassette grille (optional part) parts list 2-1. Model: UTG-UFGF-W ¢ Panels Description Parts No. Decoration Panel 9382821005 without Insulations Display panel assy 9383100048 9375530013 Panel Cover without Insulations 9711310002 Indicator PCB 9375549015 Connector Cover - (02-2) - 2-1. Model: UTG-UFGF-W 2.
Page 27 ¢ Intake grille Description Parts No. 9382863005 Intake grille 9375533014 Long Life Filter 9375546014 Hook bracket 9375532031 Grille hook - (02-3) - 2-1. Model: UTG-UFGF-W 2. Cassette grille (optional part) parts list...
Page 28 ¢ Louvers and motors Description Parts No. 9900139070 Step Motor (White connector) 9900139087 Step Motor (Red connector) 9375727048 Flap assy A 9377759047 Flap assy B - (02-4) - 2-1. Model: UTG-UFGF-W 2. Cassette grille (optional part) parts list...
Page 29 - (02-5) - 2-1. Model: UTG-UFGF-W 2. Cassette grille (optional part) parts list...
Page 30 3. Indoor unit parts list 3-1. Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA Item no. Part no. Part name Service part 9379665001 Drain hose ♦ 9379757010 Hose band ♦ 9900942038 Pipe thermistor ♦ 9900826000 Room thermistor ♦ - (02-6) - 3-1. Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA...
Page 31 ♦ 9710995866 Main PCB (For 24 model) ♦ 0600063023 Holder ♦ 9710019005 Communication PCB ♦ 9710661006 Power supply PCB ♦ 9900568009 Terminal ♦ 9900896003 Terminal ♦ - (02-7) - 3-1. Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA 3. Indoor unit parts list...
Page 32 Drain pan sub assy (For 22, 24 model) ♦ 9375718015 Drain port sub assy ♦ 9375721046 Float switch sub assy ♦ 9375717025 Drain pump sub assy ♦ - (02-8) - 3-1. Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA 3. Indoor unit parts list...
Page 33 Evaporator total assy (For 22, 24 model) ♦ 9377764065 Insulation box sub assy (For 07, 09, 12, 14, 18 model) ♦ 9377764058 Insulation box sub assy (For 22, 24 model) ♦ - (02-9) - 3-1. Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA 3. Indoor unit parts list...
Page 34 Service part 9375719012 Fan motor sub assy ♦ 9602436019 Fan motor ♦ 9375480011 2 stage turbo fan assy ♦ 9377807014 Shaft cap ♦ 9377811011 Washer cover ♦ - (02-10) - 3-1. Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA 3. Indoor unit parts list...
Page 35 3-2. Model: ARXG18KLLAP Item no. Part no. Part name Service part 9379906012 Side panel R sub assy ♦ 9379907019 Side panel L sub assy ♦ 9379900003 Pipe panel sub assy ♦ 9379915007 Panel (Window) sub assy ♦ 9380042013 Outlet frame assy ♦...
Page 36 Item no. Part no. Part name Service part 9379908047 Total panel sub assy ♦ 9379570022 Sirocco fan assy ♦ 9379570039 Sirocco fan assy ♦ 9381052004 Shaft assy ♦ 9378038011 Joint assy ♦ 9379644006 Rubber (Vibration proof) ♦ 9379572019 Casing B ♦...
Page 37 Item no. Part no. Part name Service part 9710661006 Power supply PCB ♦ 9710624131 Main PCB ♦ 9710019005 2-way remote PCB ♦ 9900568009 Terminal 3P ♦ 9900896003 Terminal 3P (For wired remote controller) ♦ — 9900653019 Room thermistor ♦ — 9900942045 Pipe thermistor ♦...
Page 38 3-3. Models: ARXG22KMLA and ARXG24KMLA Hook metal Ref. Description Part number Room thermistor 9900826048 Pipe thermistor 9900942045 - (02-14) - 3-3. Models: ARXG22KMLA and ARXG24KMLA 3. Indoor unit parts list...
Page 39 Ref. Description Part number Main PCB (22) 9710624124 Main PCB (24) 9710624223 Holder 0600063023 Communication PCB 9710019005 Power supply PCB 9710661013 Terminal 3P 9306489045 Terminal 5P 9900896003 Reactor assy 9707457049 - (02-15) - 3-3. Models: ARXG22KMLA and ARXG24KMLA 3. Indoor unit parts list...
Page 40 Main panel sub assy Ref. Description Part number Bracket pipe sub assy Drain pan sub assy 9374513017 Evaporator Total Assy 9374517978 - (02-16) - 3-3. Models: ARXG22KMLA and ARXG24KMLA 3. Indoor unit parts list...
Page 41 Intake cover sub assy Description Ref. Part number Casing A 9374233021 Casing B 9374234028 Sirocco fan assy 9356531060 Fan motor assy 9380718031 Intake frame assy Rubber 9385102002 Motor bracket - (02-17) - 3-3. Models: ARXG22KMLA and ARXG24KMLA 3. Indoor unit parts list...
Page 42 4. Outdoor unit parts list 4-1. Model: AOHG36KRTA ¢ Exterior parts and chassis - (02-18) - 4-1. Model: AOHG36KRTA 4. 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 - (02-20) - 4-1. Model: AOHG36KRTA 4. Outdoor unit parts list...
Page 45 Item no. Part no. Part name Service part 9383858000 Sound insulation unit ♦ 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 4-2. Models: AOHG45KRTA and AOHG54KRTA ¢ Exterior parts and chassis - (02-22) - 4-2. Models: AOHG45KRTA and AOHG54KRTA 4. 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 - (02-24) - 4-2. Models: AOHG45KRTA and AOHG54KRTA 4. Outdoor unit parts list...
Page 49 Item no. Part no. Part name Service part 9383858017 Sound insulation unit ♦ 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 5. Accessories 5-1. Indoor unit ¢ Compact cassette type  Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Drain hose insulation Operating manual Hose band (CD-ROM) Coupler heat insulation Installation manual (large) Coupler heat insulation...
Page 51 ¢ Slim duct type  Model: ARXG18KLLAP Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Filter (large) Operating manual Drain hose (CD-ROM) Installation manual Hose band Installation template Drain hose insulation B Insulation Washer (for electrical wiring) Coupler heat insulation Cable tie (large) (large) Coupler heat insulation...
Page 52 ¢ Duct type  Models: ARXG22KMLA and ARXG24KMLA Part name Exterior Q’ty Part name Exterior Q’ty Operating manual Cable tie (Small) Installation manual Cable tie Coupler heat insulation CD-ROM (Large) Coupler heat insulation Hanger (Small) M10 nut A Drain hose insulation (with flange) M10 nut B Cable tie (Large)
Page 53 6. Optional parts 6-1. Branch pipes ¢ Model: UTP-SX236A Unit: mm Port diameters Liquid pipe Q’ty Gas pipe Q’ty Ø12.70 Ø6.35 Ø9.52 Ø15.88 Ø6.35 Ø12.70 Ø12.70 Ø19.05 Dimensions Liquid pipe Gas pipe Heat insulation cover Liquid pipe Q’ty Gas pipe Q’ty - (02-29) - 6-1.
Page 54 ¢ Model: UTP-SX354A Unit: mm Port diameters Liquid pipe Q’ty Gas pipe Q’ty Ø15.88 Ø9.52 Ø12.70 Ø19.05 Ø6.35 Ø6.35 Ø6.35 Ø12.70 Ø12.70 Ø12.70 Dimensions Liquid pipe Gas pipe Heat insulation cover Liquid pipe Q’ty Gas pipe Q’ty Others Cable tie Q’ty - (02-30) - 6-1.
Page 55 6-2. Controllers ¢ Lineup Type Indoor unit type Wired remote controller Simple remote controller UTY-RNNYM UTY-RVNYM UTY-RSNYM Compact cassette ◌ ◌ ◌ Slim duct ◌ ◌ ◌ Duct ◌ ◌ ◌ Type IR receiver kit with Wireless remote Indoor unit type Wireless remote controller controller UTY-LNTG...
Page 56 Exterior Part name Model name Summary Room temperature can be controlled by detecting the temperature Wired remote UTY-RNNYM accurately with built-in thermo sensor. controller UTY-RNNGM Wire type: Polar 3-wire Compact remote controller concentrates on the basic functions such as Start/Stop, fan control, UTY-RSNYM Simple remote temperature setting, and operation...
Page 57 6-4. Others ¢ Lineup Indoor unit Type Model Outdoor unit Compact Slim duct Duct cassette Air outlet shutter plate UTR-YDZB ◌ — — — Insulation kit for high UTZ-KXGC ◌ — — — humidity Fresh air intake kit UTZ-VXAA ◌ —...
Page 58 Exterior Part name Model name Summary Optional drain lift up mechanism Drain pump unit UTZ-PX1NBA allows more flexible installation. Use to connect with various peripheral External devices and air conditioner PCB. UTY-XWZXZG connect kit For control output port. Air outlet shutter Installed at the air outlet when 3- UTR-YDZC plate...
Page 59 Exterior Part name Model name Summary Air conditioner switching can be External switch UTY-TERX controlled by connecting other external controller sensor switches. NOTE: Combined use of following optional parts and Wireless LAN adapter (UTY-TFSXZ1) is not allowed. • Modbus converter •...
Page 60 7. Refrigerant system diagrams 7-1. Models: AOHG36KRTA, AOHG45KRTA, and AOHG54KRTA Heat exchanger 3-Way 3-Way ( INDOOR ) valve valve Pressure switch Pressure sensor 4-Way valve Strainer Expansion valve Heat exchanger Strainer ( OUTDOOR ) : Cooling : Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Heat Exchanger Med temperature) : Thermistor (Outdoor temperature)
Page 61 8. Wiring diagrams 8-1. Indoor unit ¢ Compact cassette type  Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA ¢ Slim duct type  Model: ARXG18KLLAP WLAN adapter, Converter etc. (Option) - (02-37) - 8-1. Indoor unit 8. Wiring diagrams...
Page 62 ¢ Duct type  Models: ARXG22KMLA and ARXG24KMLA 8-2. Outdoor unit ¢ Model: AOHG36KRTA - (02-38) - 8-1. Indoor unit 8. Wiring diagrams...
Page 63 ¢ Models: AOHG45KRTA and AOHG54KRTA - (02-39) - 8-2. Outdoor unit 8. Wiring diagrams...
Page 64 9. PC board diagrams 9-1. Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA CONTROL UNIT 09 model: EZ-0181RHSE 18 model: EZ-0181THSE 12 model: EZ-0181SHSE 22 model: EZ-01810HSE WIRED REMOTE CONTROLLER Thermistor Characteristics. 14 model: EZ-0181CHSE 24 model: EZ-01821HSE Temperature ( OPTION ) EMI FILTER...
Page 65 9-2. Model: ARXG18KLLAP CONTROL UNIT 09 model: EZ-0181YHSE 14 model: EZ-01814HSE 12 model: EZ-01820HSE 18 model: EZ-01813HSE CN8 Thermistor Characteristics. Temperature DC5V-1 ( 20 ( 30 Thermistor CN8-1 BLACK THERMISTOR ( ROOM TEMP. ) F200 B02B-XASK-1-A 33.62 k 12.54 k 8.04 k CN8-2 BLACK...
Page 66 9-3. Models: ARXG22KMLA and ARXG24KMLA CONTROL UNIT 22 model: EZ-01811HSE 24 model: EZ-0182EHSE CN8 Thermistor Characteristics. Temperature ( 20 ( 30 Thermistor B02B-XASK-1-A 33.62 k 12.54 k 8.04 k WHITE Thermistor ( Room temp. ) DC5V-1 1.15 V 2.22 V 2.77 V CN8-1 BLACK...
Page 67 9-4. Models: AOHG36KRTA, AOHG45KRTA, and AOHG54KRTA INVERTER ASSEMBLY 36 model : EZ-0190HUE 45 model : EZ-0191HUE 54 model : EZ-0191HUE DC340V UL1015 AWG20 GREEN UL1430 AWG22 DC FAN MOTOR 1 DC15V-2 TERMINAL EMI FILTER UL1430 AWG22 EMI FILTER BLACK BLACK F102 GRFC-8 P650...
Page 68 - (02-44) - 9-4. Models: AOHG36KRTA, AOHG45KRTA, and AOHG54KRTA 9. PC board diagrams...
Page 69 3. TROUBLESHOOTING 2021.06.15 SR_CH03_SM001EG_03...
Page 70 CONTENTS 3. TROUBLESHOOTING 1. Error code ....................03-1 1-1. How to check the error memory..................03-1 1-2. How to erase the error memory ..................03-1 1-3. Error code table (Wired remote controller)..............03-2 1-4. Error code table (Outdoor unit: for 36/45/54 model only)..........03-3 2. Troubleshooting with error code ...............03-5 2-1.
Page 71: Table Of Contents
CONTENTS (continued) 3. Troubleshooting without error code............03-49 3-1. Indoor unit—No power....................03-49 3-2. Outdoor unit—No power....................03-50 3-3. No operation (Power is on) ...................03-51 3-4. No cooling/No heating ....................03-53 3-5. Abnormal noise......................03-55 3-6. Water leaking........................03-56 4. Service parts information .................03-57 4-1. Compressor........................03-57 4-2.
Page 73 1. Error code When a problem occurs in the system or the connected device, the error content is notified by dis- playing the code. NOTE: This function is only available in a system with indoor or IR receiver units equipped with LED lamps to indicate the error content.
Page 74 1-3. Error code table (Wired remote controller) The operation, timer, and economy indicators operate according to the error contents. For confirmation of the error contents, refer the flashing pattern as follows. Wired remote Error contents controller display E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit) E: 11.
Page 75 1-4. Error code table (Outdoor unit: for 36/45/54 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 "Function settings "...
Page 76 PUMP LOW NOISE PEAK CUT POWER/ DOWN Error contents ERROR MODE E: 84. Current sensor error (Outdoor ■ ● ■ ■ ○ ○ ○ ● unit) E: 86. High pressure switch error ■ ● ■ ■ ○ ● ○ ○ (Outdoor unit) E: 86.
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 wired remote controller more than following time during normal operation. Detective actuator Wired remote control •...
Page 82 Check Point 2 : Wire installation wrong remote controller group setting • Wrong wire connection in remote controller group (Please refer to the installation manual) • The number of connecting indoor unit and remote controller in one remote controller group were less than 16 units.
Page 83: E: 18. External Communication Error (Indoor Unit)
2-4. E: 18. External communication error (Indoor unit) Wired remote Indicator Error code E: 18 controller External After receiving a signal from the external input and Detective actuator Indoor unit communication output PCB, the same signal has not been received for error 15 seconds.
Page 84: E: 23. Combination Error (Outdoor Unit)
2-5. E: 23. Combination error (Outdoor unit) Wired remote Indicator Error code E: 23 controller The outdoor unit receives the serial signal of applied Detective actuator Indoor unit refrigerant information from indoor unit. Forecast of cause Incorrect indoor unit is selected. Check point 1.
Page 85: E: 26. Address Setting Error In Wired Remote Controller (Indoor Unit)
2-6. E: 26. Address setting error in wired remote controller (Indoor unit) Wired remote Indicator Error code E: 26 controller Wired remote controller (2-wire) • When the address number set by auto setting and manual setting are mixed in one remote controller group Detective actuator Indoor unit controller PCB...
Page 86: E: 29. Connected Unit Number Error (Indoor Unit)
2-7. E: 29. Connected unit number error (Indoor unit) Wired remote Indicator Error code E: 29 controller Wired remote controller (2-wire) When the number of the connected indoor unit exceeds Detective actuator the limitation. Indoor unit main PCB Wrong wiring of indoor unit or remote controller Number of indoor unit or remote controller in remote Forecast of cause controller group...
Page 87: E: 32. Indoor Unit Main Pcb Error (Indoor Unit)
2-8. 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 88: E: 33. Indoor Unit Motor Electricity Consumption Detection Error (Indoor Unit)
2-9. 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 89: E: 35. Manual Auto Button Error (Indoor Unit)
2-10. 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 90: E: 39. Indoor Unit Power Supply Error For Fan Motor (Indoor Unit)
2-11. 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 91 2-12. E: 3A. Indoor unit communication circuit (wired remote controller) error Wired remote Indicator Error code E: 3A controller Wired remote controller (2-wire) Detect the communication error of microcomputer and Detective actuator communication PCB. Indoor unit controller PCB circuit Communication PCB defective Forecast of cause Indoor unit main PCB defective Check point 1.
Page 92: E: 41. Room Temperature Sensor Error (Indoor Unit)
2-13. 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 93: E: 42. Indoor Unit Heat Exchanger Sensor Error (Indoor Unit)
2-14. 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 94: E: 51. Indoor Unit Fan Motor Error (Indoor Unit)
2-15. 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 95: E: 53. Drain Pump Error (Indoor Unit)
2-16. 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 96: 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 97: 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 98: 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 420 V for over 3 seconds, the compressor stops. Detective actuator Outdoor unit Main PCB •...
Page 99: 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 of IPM is “L” (0 V) Detective actuator Outdoor unit Main PCB during the compressor stopping. Forecast of cause Main PCB failure Check point 1.
Page 100: 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 101: E: 72. Compressor Thermistor Error (Outdoor Unit)
2-22. E: 72. Compressor thermistor error (Outdoor unit) Wired remote Indicator Error code E: 72 controller Outdoor unit main PCB When compressor temperature thermistor open or short Detective actuator circuit is detected at power on or while running the Compressor temperature thermistor compressor Connector failure Forecast of cause...
Page 102: E: 73. Heat Exchanger (Middle/Outlet) Temperature Thermistor Error (Outdoor Unit)
2-23. 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 103: E: 74. Outdoor Temperature Thermistor Error (Outdoor Unit)
2-24. 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 104: E: 77. Heat Sink Thermistor Error (Outdoor Unit)
2-25. E: 77. Heat sink thermistor error (Outdoor unit) Wired remote Indicator Error code E: 77 controller Detective actuator Heat sink temperature thermistor Heat sink temperature thermistor short or open detected Connector failure Forecast of cause Thermistor failure Inverter PCB failure Check point 1.
Page 105: E: 84. Current Sensor Error (Outdoor Unit)
2-26. 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 106: E: 86. High Pressure Switch Error (Outdoor Unit)
2-27. 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 107: E: 86. Pressure Sensor Error (Outdoor Unit)
2-28. E: 86. Pressure sensor error (Outdoor unit) Wired remote Indicator Error code E: 86 controller Outdoor unit main PCB 30 seconds or more after power-on, when pressure sensor detection value detects the condition below Detective actuator continuously for 30 seconds or more. High pressure switch Ps ≤...
Page 108: E: 94. Trip Detection (Outdoor Unit)
2-29. 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 109: E: 95. Compressor Motor Control Error (Outdoor Unit)
2-30. E: 95. Compressor motor control error (Outdoor unit) Wired remote Indicator Error code E: 95 controller Main PCB "Protection stop by "overcurrent generation at inverter Detective actuator Outdoor unit compressor starting" restart" generated consecutively 10 Compressor times x 3 sets (total 30 times) Defective connection of electric components Forecast of cause Main PCB failure...
Page 110: E: 97. Outdoor Unit Fan Motor Error (Outdoor Unit)
2-31. E: 97. Outdoor unit fan motor error (Outdoor unit) Wired remote Indicator Error code E: 97 controller Inverter PCB 1. When outdoor fan rotation speed is less than 100 rpm in 20 seconds after fan motor starts, fan motor Main PCB stops.
Page 111 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 "Wiring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-37.
Page 112: E: 99. 4-Way Valve Error (Outdoor Unit)
2-32. 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 113 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 03-57. • Solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.97kΩ. →...
Page 114 2-33. 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 115 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. ↓ - (03-43) - 2-33. E: A1. Discharge temperature error (Outdoor unit) 2.
Page 116 2-34. E: A3. Compressor temperature error (Outdoor unit) Wired remote Indicator Error code E: A3 controller Outdoor unit main PCB Protection stop by compressor temperature ≥ 108 °C Detective actuator during compressor operation generated 2 times within Compressor temperature thermistor 24 hours.
Page 117 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. ↓ - (03-45) - 2-34. E: A3. Compressor temperature error (Outdoor unit) 2.
Page 118 2-35. 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 119 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. ↓ - (03-47) - 2-35. E: A5. Low pressure error (Outdoor unit) 2.
Page 120 2-36. E: AC. Heat sink temperature error (Outdoor unit) Wired remote Indicator Error code E: AC controller Outdoor unit inverter PCB Protection stop by heat sink temperature ≥ 80 °C during Detective actuator heat sink operation generated 2 times within 24 hours. Heat sink temperature thermistor Foreign matter on heat sink, heat sink dirty Foreign matter on heat exchanger, excessive ambient...
Page 121: Troubleshooting Without Error Code
3. Troubleshooting without error code 3-1. Indoor unit—No power Power supply failure Forecast of cause External cause Electrical components defective Check point 1. Check installation condition • Isn’t the breaker down? • Check loose or removed connection cable. -> If abnormal condition is found, correct it by referring to the installation manual or the “DESIGN & TECHNICAL MANUAL”.
Page 122: 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 123: 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 124 Check point 4. Replace main PCB If check point 1 to 3 do not improve the symptom, change main PCB. ↓ - (03-52) - 3-3. No operation (Power is on) 3. Troubleshooting without error code...
Page 125: 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 126 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 127: 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 128: Water 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? ↓...
Page 129: 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 130: Inverter Compressor
4-2. Inverter compressor ¢ Model: AOHG36KRTA 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)
Page 131 ¢ Models: AOHG45KRTA and AOHG54KRTA 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 132 Check point 3. Replace inverter PCB If check point 1 to 2 do not improve the symptom, replace main PCB. - (03-60) - 4-2. Inverter compressor 4. Service parts information...
Page 133: Outdoor Unit Electronic Expansion Valve (Eev)
4-3. Outdoor unit Electronic Expansion Valve (EEV) ¢ Models: AOHG36KRTA, AOHG45KRTA, and AOHG54KRTA 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 02-37.
Page 134 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 135: Indoor Unit Fan Motor
4-4. Indoor unit fan motor ¢ Models: AUXG18KVLA, AUXG22KVLA, and AUXG24KVLA 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.
Page 136: Outdoor Unit Fan Motor
4-5. Outdoor unit fan motor ¢ Models: AOHG36KRTA, AOHG45KRTA, and AOHG54KRTA Check point 1. Check rotation of fan Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor) → If fan or bearing is abnormal, replace it. Check point 2.
Page 137: Pressure Switch
4-6. Pressure switch ¢ Models: AOHG36KRTA, AOHG45KRTA, and AOHG54KRTA • 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 36/45/54 model: P770 - (03-65) - 4-6.
Page 138: 4-Way Valve Coil (Solenoid Coil)/4-Way Valve
4-7. 4-way valve coil (solenoid coil)/4-way valve ¢ Models: AOHG36KRTA, AOHG45KRTA, and AOHG54KRTA 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 139: Thermistor Resistance Values
5. Thermistor resistance values 5-1. Indoor unit ¢ Room temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -10.0 58.25 0.73 -5.0 44.03 0.93 33.62 1.15 25.93 1.39 10.0 20.18 1.66 15.0 15.84 1.94 20.0 12.54 2.22 25.0 10.00 2.50 30.0 8.04 2.77 35.0...
Page 140: 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 141 ¢ 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 142 ¢ 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 143 4. CONTROL AND FUNCTIONS 2021.05.19 SR_CH04_SM001EG_02...
Page 144 CONTENTS 4. CONTROL AND FUNCTIONS 1. Compressor frequency control..............04-1 1-1. Cooling operation ......................04-1 1-2. Heating operation ......................04-5 1-3. Dry operation ........................04-5 1-4. Compressor frequency at normal start-up ..............04-6 1-5. Compressor frequency limitation by outdoor temperature ..........04-8 2. Auto changeover operation..............04-10 3.
Page 145 CONTENTS (continued) 8-8. Low outdoor temperature protection................04-38 8-9. High temperature and high pressure release control ............04-38...
Page 147: Compressor Frequency Control
1. Compressor frequency control 1-1. Cooling operation A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. •...
Page 148 – Model: AOHG36KRTA Outdoor Indoor unit fan mode Model name temperature HIGH QUIET zone A zone B zone C zone AUXG18KVLA D zone E zone F zone – Models: AOHG45KRTA and AOHG54KRTA Outdoor Indoor unit fan mode Model name temperature HIGH QUIET...
Page 149 ¢ Slim duct type • Compressor frequency range Connected model nameMaximum frequency Minimum frequency AOHG36KRTA98 rps 15 rps AOHG54KRTA95 rps 17 rps • Limit of maximum speed based on outdoor temperature Outdoor temperature rises Outdoor temperature drops 36°C A zone 34°C 32°C B zone...
Page 150 ¢ Medium static pressure duct type • Compressor frequency range Connected model name Minimum frequency Maximum frequency AOHG45KRTA 17 rps 95 rps AOHG54KRTA 17 rps 95 rps • Limit of maximum speed based on outdoor temperature Outdoor temperature rises Outdoor temperature drops 36°C A zone...
Page 151: Heating Operation
1-2. Heating operation A sensor (room temperature thermistor) built in indoor unit body will usually perceive difference or variation between setting temperature and present room temperature, and controls operation fre- quency of compressor. • If the room temperature is 6.0 °C lower than a set temperature, the compressor operation frequen- cy will attain to maximum performance.
Page 152: Compressor Frequency At Normal Start-Up
1-4. Compressor frequency at normal start-up ¢ Model: AOHG36KRTA 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...
Page 153 ¢ Models: AOHG45KRTA and AOHG54KRTA 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...
Page 154: Compressor Frequency Limitation By Outdoor Temperature
1-5. Compressor frequency limitation by outdoor temperature 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 155 • 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 156: 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 157 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 158: Fan Control
Tr: Room temperature Ts: Setting temperature 3-1. Indoor fan control ¢ Compact cassette type  Fan speed Indoor fan speed is defined as below. Speed (rpm) Operation mode Fan mode AUXG18KVLA AUXG22KVLA AUXG24KVLA HIGH MED+ Heating QUIET Cool air prevention S-LOW...
Page 159  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 160 • Powerful operation Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 42°C 37°C HIGH 39°C 34°C or setting fan mode* 37°C 32°C Cool air prevention 30°C 24°C S-LOW 13 minutes later: Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 42°C...
Page 161 ¢ Slim duct and Medium static pressure duct types  Fan speed Indoor fan speed is defined as below. Speed (rpm) Operation mode Fan mode ARXG22KMLA ARXG18KLLAP ARXG24KMLA HIGH 1,380 1,300 Heating 1,220 QUIET 1,140 S-LOW HIGH 1,380 1,300 1,220 Cooling/Fan QUIET 1,140...
Page 162  Heating operation Switch the airflow AUTO, and the indoor fan motor will run according to a room temperature, as be- low. On the other hand, if switched in HIGH—QUIET, the indoor motor will run at a constant airflow of HEAT operation modes QUIET, LOW, MED, HIGH as shown in “Fan speed”...
Page 163  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) - (04-17) - 3-1.
Page 164: 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: AOHG36KRTA Fan speed is defined by outdoor temperature and compressor frequency. Unit: rpm Fan step Cooling or dry...
Page 165  Models: AOHG45KRTA and AOHG54KRTA 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 166: Louver Control
4. Louver control 4-1. Individual louver control(For Compact cassette type) To independently can be set the airflow pattern of each louver as follows: This function is given priority to overall louver control. But this function is release during the following operation.
Page 167: Swing Operation(For Compact Cassette Type)
4-3. Swing operation(For Compact cassette type) • To select vertical airflow swing operation When the swing signal is received, the vertical airflow direction louver starts to swing. – Swinging range • Cooling mode/dry mode/fan mode: 1 ↔ 4 • Heating mode: 1 ↔ 4 –...
Page 168: 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 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: 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 171 ¢ 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 172 ¢ 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 173: 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 174: Defrost Operation In Heating Operation Stopped
6-1. Defrost operation in heating operation stopped If the outdoor unit is frosted when stopping the heating operation, it stops after performing the auto- matic defrosting operation. In this time, if the indoor unit operation lamp flashes slowly (6 sec on/2 sec off), the outdoor unit al- low the heat exchanger to defrost, and then stop.
Page 175: 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 176: Compressor Preheating
7-5. Compressor preheating By preheating the compressor, warm airflow is quickly discharged when the operation is started. • Triggering condition 1 – Outdoor temperature ≤ 20°C When outdoor temperature reaches 26°C, compressor preheating stops. – 30 minutes after compressor stopped •...
Page 177: Drain Pump Control
7-8. Drain pump control ¢ Drain control for dehumidification operation  During cooling or dry mode • On the main unit, when the compressor starts, the drain pump unit starts simultaneously. When the sub unit receives the signal from the main unit, the drain pump of the sub unit starts simultaneously.
Page 178: Prevention To Restart For 3 Minutes (3 Minutes St)
 During heating mode or fan mode and when operation is stopped • Triggering condition Drain pump is turned on at the same time that the float switch is turned on. • Operation details When the float switch turns on continuously for 3 minutes, "failure indication" operates. There- after, even if the float switch turns off, the "failure indication"...
Page 179: Outdoor Unit Low Noise Operation
7-12. Outdoor unit low noise operation The compressor frequency and outdoor unit fan speed are limited to reduce the operation noise by external input. Compressor Outdoor fan speed frequency Low noise mode Low noise mode Cooling/Dry Level 1 Heating AOHG36KRTA Cooling/Dry Level 2 Heating...
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: Low Pressure Protection Control (Cooling Mode)
8-4. Low pressure protection control (cooling mode) • After the compressor start-up and 10 minutes has passed When the pressure sensor detected value is 0.68MPaG or less continues for 1minute, the com- pressor frequency -8rps. • After the frequency of the compressor -8rps and 1 minute has passed When the pressure sensor detected value is 0.68MPaG or less, continues for 1 minute, the com- pressor continues frequency -8rps every 1 minute until the detected value becomes more than 0.68MPaG.
Page 183: Indoor Unit Fan Motor Over Temperature Protection
8-5. Indoor unit fan motor over temperature protection ¢ Compact cassette type When satisfy the following conditions, the protection works. • After the 90 seconds from the fan operation, detect less than 300 rpm for 10 seconds. • IPM trip protection works. •...
Page 184: High Pressure Protection
8-7. High pressure protection Pressure switch: Off (Open: Higher than 4.2 MPa) Trigger condition Compressor stop Pressure switch: On (Close: Lower than 3.2 MPa) Release condition (3 minutes after compressor stop) Compressor restart 8-8. Low outdoor temperature protection When the outdoor temperature sensor detects lower than the trigger condition below, the compres- sor is stopped.
Page 185 5. FILED WORKING 2021.06.15 SR_CH05_SM001EG_03...
Page 186 CONTENTS 5. FILED WORKING 1. Function settings ..................05-1 1-1. Outdoor unit........................05-1 1-2. Compact cassette type (setting by DIP switch)...............05-5 1-3. Slim duct type (setting by DIP switch)................05-7 1-4. Duct type (setting by DIP switch)..................05-9 1-5. Indoor unit (setting by wireless remote controller) ............05-11 1-6.
Page 187: Function Settings
1. Function settings To adjust the functions of this product according to the installation environment, various types of function settings are available. NOTE: Incorrect settings can cause a product malfunction. 1-1. Outdoor unit ¢ Control PCB and switch buttons location Control PCB of the outdoor unit is located as shown in the following figure.
Page 188 Switch button Function or operation method S134 MODE Switches between “Local setting” and “Error code display”. Switches between the individual “Local settings” and the “Error code S133 SELECT displays”. Switches between the individual “Local settings” and the “Error code S132 ENTER displays”.
Page 189 ¢ 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 190  Peak cut mode Press the MODE switch button (S134) for 3 seconds or more to switch to “Local setting mode”. After confirming the LED lamp of POWER/MODE blinks 9 times, press the ENTER switch but- ton (S132). PUMP POWER LOW NOISE PEAK CUT DOWN...
Page 191: Compact Cassette Type (Setting By Dip Switch)
1-2. Compact cassette type (setting by DIP switch) By using some components on the PCB, you can change the function settings. ¢ Component location Components on the indoor unit main PCB used for the function settings are located as shown in the following figure.
Page 192 ¢ DIP switch setting • SW100: Remote controller address setting NOTE: Because this setting is normally done automatically when 2-core wired remote con- troller is installed, setting is unnecessary. Multiple indoor units can be operated by using one wired remote controller. Set the unit number of each indoor unit.
Page 193: Slim Duct Type (Setting By Dip Switch)
1-3. Slim duct type (setting by DIP switch) By using some components on the PCB, you can change the function settings. Related components on the PCB and the applicable settings: Component Setting content SW100 Remote controller address setting DIP switch Drainage function setting SW101 Auto louver grille setting...
Page 194 ¢ DIP switch setting • SW100: Remote controller address setting When operating a number of indoor units by using a wired remote controller, DIP switch set- ting for assigning unit number to each indoor unit is required. The slide switches are normally set to make the unit number 00. Remote Switch number controller...
Page 195: Duct Type (Setting By Dip Switch)
1-4. Duct type (setting by DIP switch) By using some components on the PCB, you can change the function settings. Related components on the PCB and the applicable settings: Component Setting content SW100 Remote controller address setting DIP switch Setting change prohibited SW101 Setting change prohibited Fan delay setting...
Page 196 ¢ DIP switch setting • SW100: Remote controller address setting When operating a number of indoor units by using a wired remote controller, DIP switch set- ting for assigning unit number to each indoor unit is required. The slide switches are normally set to make the unit number 00. Remote Switch number controller...
Page 197: Indoor Unit (Setting By Wireless Remote Controller)
1-5. Indoor unit (setting by wireless remote controller) CAUTION This setting changes the function settings used to control the indoor unit according to the installa- tion conditions. Incorrect settings can cause a product malfunction. • After the power is turned on, perform the “Function setting” according to the installation conditions using the remote controller.
Page 198 ¢ UTY-LNTG (included in UTY-LBTYM)  Button name and function During address setting mode, indoor unit reject the any operation command from remote con- troller. Function number Refer to Function details. Setting number Refer to Function details. 10°C HEAT button ECONOMY button Changes the displayed digits.
Page 199 Select the function number by pressing the or the buttons. Each time the 10°C HEAT button is pressed, it switches between the right digit and the left digit. Change digit Change digit Proceed to the setting number by pressing the ECONOMY button. (To return to the function number selection, press the ECONOMY button again.) Select the function number by pressing the or the...
Page 200 Press the button once to transmit the function setting information. 1 short beep will be emit- ted from the indoor unit or the IR receiver when the signal is received correctly. If wrong code is set, no beep sound will be emitted. 1 short beep NOTE: Press button within 30 seconds after pressing MODE button.
Page 201  Setting up each indoor unit Repeat step from 1. to 8. to set up each indoor unit. If the custom code is other than " ", steps from 1. to 2. and 8. need to be performed.  Resetting the power after setting up all indoor units Important: •...
Page 202  Remote controller custom code setting Custom code setting of wireless remote controller needs to be same as the setting of the indoor unit. When you change the custom code setting of the wireless remote controller, do as follows: Press the START/STOP button until only the clock is displayed on the display. Press the MODE button for at least 5 seconds to display the current custom code (initially set to Press the SET TEMP.
Page 203: Indoor Unit (Setting By Wired Remote Controller)
1-6. Indoor unit (setting by wired remote controller) • The function settings of the control of the indoor unit can be changed by this procedure according to the installation conditions. Incorrect settings can cause the indoor unit malfunction. • After the power is turned on, perform the “Function setting” according to the installation conditions using the remote controller.
Page 204 ¢ UTY-RNNYM  Button name and function During address setting mode, indoor unit reject the any operation command from remote controller. Function number Refer to Function details Remote controller address Setting number Refer to Function details Λ SET TEMP. “V” and “ ”...
Page 205 Confirm the setting by pressing the TIMER SET button. The data will be transferred to the indoor unit. Not good Good ● Data is not set up on the indoor unit Data is correctly set up on the indoor unit correctly (-- is displayed.) (Flashing display changes to illuminated display.) ●...
Page 206 ¢ UTY-RVNYM  Function setting procedure Connect the power supply of the outdoor unit. Switch to the function setting mode. When [Menu button] is pressed twice while “Monitor” screen is displayed, it switches to the “Submenu” screen. If [Menu button] is pressed while the “Submenu” screen is displayed, the display returns to the “Monitor”...
Page 207 Select the [Function No.] with pressing the [Cursor button (Left/Right)], and select the Function No. to be set with pressing the [Cursor button (Up/Down)]. Function setting Mo 10:00AM R.C. Function Setting address Cancel: Version Error history Select the [Setting No.] with pressing the [Cursor button (Left/Right)], and select the Setting No. to be set with pressing the [Cursor button (Up/Down)].
Page 208 When [Cancel button] is pressed twice while “Function setting” screen is displayed, it switches to the “Submenu” screen. Function setting Mo 10:00AM R.C. Function Setting Submenu Mo 10:00AM address Date and time Screen Cancel: Filter sign Version Error history R.C. sensor control Room temp.
Page 209: Indoor Unit (Setting By Simple Remote Controller)
1-7. Indoor unit (setting by simple remote controller) • The function settings of the control of the indoor unit can be changed by this procedure according to the installation conditions. Incorrect settings can cause the indoor unit malfunction. • After the power is turned on, perform the “Function setting” according to the installation conditions using the remote controller.
Page 210 ¢ UTY-RSNYM  Button name and function During address setting mode, indoor unit reject the any operation command from remote controller. Function number Setting number Refer to Function details Refer to Function details Remote controller address START/STOP button Transmits function setting FAN button SET TEMP.
Page 211 Select the setting number by pressing the SET TEMP. or SET TEMP. button. The setting number indicator flashes during setting number selection. Setting number Example) Function number : 30, Setting number : 01 Confirm the setting by pressing the TIMER SET button. The data will be transferred to the indoor unit.
Page 212  Resetting the power after setting up function of all indoor units NOTES: • If the reset is not performed, function cannot be read correctly. • After all the functions have been set, the circuit breaker needs to be switched off for at least 2 minutes.
Page 213: Function Details
1-8. Function details ¢ Contents of function setting Each function setting listed in this section is adjustable in accordance with the installation environ- ment. NOTE: Setting will not be changed if invalid numbers or setting values are selected.  Function setting list Function Compact Functions...
Page 214 2) Filter sign Select appropriate intervals for displaying the filter sign on the indoor unit according to the estimated amount of dust in the air of the room. If the indication is not required, select "No indication" (03). Function number Setting value Setting description Factory setting...
Page 215 6) Static pressure (For Slim duct type only) Select the appropriate static pressure according to the installation conditions. Function number Setting value Setting description Factory setting 0 Pa 10 Pa 20 Pa 30 Pa 40 Pa 50 Pa 60 Pa 70 Pa 80 Pa 90 Pa...
Page 216 8) 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 217 11) 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 ♦ 12) External input control "Operation/Stop" mode or "Forced stop" mode can be selected. Function number Setting value Setting description...
Page 218 15) Primary and secondary settings Set the indoor unit that is connected to the outdoor unit using a transmission cable as the primary. Function number Setting value Setting description Factory setting Primary ♦ Secondary 16) Switching functions for external output terminal Functions of the external output terminal can be switched.
Page 219: Wired Remote Controller (Uty-Rnnym)
1-9. Wired remote controller (UTY-RNNYM) Prohibited Dual remote controller setting Prohibited DIP switch 1 °F/°C switch Prohibited Memory backup setting * Do not use DIP switch 2. ¢ Switch location Front case (back side) DIP switch 2 DIP switch 1 ¢...
Page 220  SW6: Memory backup setting Set to “ON” to use batteries for the memory backup. When batteries are not used, all of settings stored in memory will be deleted if there is a power failure. Memory backup Factory setting Disable ♦...
Page 221: Wired Remote Controller (Uty-Rvnym)
1-10. Wired remote controller (UTY-RVNYM) Memory backup setting DIP switch 1 Dual remote controller setting ¢ Switch location ¢ DIP switch setting  SW1: Memory backup setting Set to “ON” to use batteries for the memory backup. When batteries are not used, all of settings stored in memory will be deleted if there is a power failure.
Page 222: Simple Remote Controller (Uty-Rsnym)
1-11. Simple remote controller (UTY-RSNYM) Prohibited Dual remote controller setting °F/°C switch DIP switch Prohibited Prohibited Prohibited ¢ Switch location DIP Switch ¢ DIP switch setting  SW2: Dual remote controller setting Set the remote controller SW2 according to the following table. Primary unit Secondary unit Number of remote controller...

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Fujitsu AUXG18KVLA Service Manual

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4. Control and Functions

5. Filed Working

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