Daikin RXSQ24TAVJU Service Manual
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Daikin RXSQ24TAVJU Service Manual

Daikin RXSQ24TAVJU Service Manual

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SiUS331708EC
Service
Manual
RXSQ24/36/48/60TAVJU(A)
RXSQ24/36/48/60TBVJUA
Heat Pump 60 Hz

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Summary of Contents for Daikin RXSQ24TAVJU

  • Page 1 SiUS331708EC Service Manual RXSQ24/36/48/60TAVJU(A) RXSQ24/36/48/60TBVJUA Heat Pump 60 Hz...

  • Page 2: Table Of Contents

    SiUS331708EC Introduction ..................1 1. Safety Cautions...................2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Part 1 General Information ............... 9 1. Model Names and Power Supply..............10 1.1 Outdoor Unit ....................
  • Page 3 SiUS331708EC 4. Address Setting for Wireless Remote Controller........66 5. Centralized Control Group No. Setting............68 5.1 BRC1E73 ....................68 5.2 BRC1H71W....................70 5.3 Wireless Remote Controller ............... 70 5.4 Group No. Setting Example................ 71 6. Service Settings Menu, Maintenance Menu..........72 6.1 BRC1E73 ....................72 7.
  • Page 4 SiUS331708EC 6.12 Heater Control (FXTQ-TA Models)............117 6.13 Gas Furnace Control (CXTQ-TA Models) ..........120 6.14 3-Step Thermostat Processing (FXTQ-TA Models) ......... 121 6.15 2-Step Thermostat Processing (CXTQ-TA Models) ......... 122 6.16 Fan Control (Heater Residual) (FXTQ-TA Models) ........123 6.17 Interlocked with External Equipment (FXTQ-TA and CXTQ-TA Models)...
  • Page 5 SiUS331708EC 2.2 With Optional Infrared Presence/Floor Sensor......... 191 2.3 With Gas Furnace ..................192 2.4 Gas Furnace Lockout Reset..............192 3. Error Code via Remote Controller............193 3.1 Wired Remote Controller................193 3.2 Wireless Remote Controller ..............194 4. Error Code Indication by Outdoor Unit PCB..........196 5.
  • Page 6 SiUS331708EC 5.41 Radiation Fin Temperature Rise Abnormality .......... 267 5.42 Compressor Instantaneous Overcurrent ..........268 5.43 Compressor Overcurrent................269 5.44 Compressor Startup Abnormality ............. 270 5.45 Transmission Error between Microcomputers on Outdoor Unit Main PCB ......................271 5.46 Inverter Circuit Capacitor High Voltage ............ 272 5.47 Radiation Fin Thermistor Abnormality ............
  • Page 7 SiUS331708EC 6.14 Broken Wire Check of the Relay Wires ............ 325 6.15 Fan Motor Connector Check (Power Supply Cable) ........ 326 6.16 Fan Motor Connector Check (Signal Cable) ..........327 6.17 Electronic Expansion Valve Coil Check ........... 329 6.18 Fan Motor Connector Check for FXTQ-TA..........331 Part 7 Appendix ................

  • Page 8: Introduction

    SiUS331708EC Introduction 1. Safety Cautions...................2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Introduction...

  • Page 9: Safety Cautions

    SiUS331708EC Safety Cautions 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer. This manual is for the person in charge of maintenance and...
  • Page 10 Safety Cautions SiUS331708EC Warning Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. Do not turn the air conditioner on or off by plugging in or unplugging the power cable.

  • Page 11: Warnings And Cautions Regarding Safety Of Users

    SiUS331708EC Safety Cautions Caution Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns. Conduct welding work in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency.
  • Page 12 Safety Cautions SiUS331708EC Warning Do not mix air or gas other than the specified refrigerant (R-410A) in the refrigerant system. If air enters the refrigerant system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.
  • Page 13 SiUS331708EC Safety Cautions Caution Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 M or greater. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause water to enter the room and wet the furniture and floor.

  • Page 14: Icons Used

    Icons Used SiUS331708EC 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning Warning is used when there is danger of personal injury. Warning Caution Caution is used when there is danger that the reader, Caution through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part...

  • Page 15: Revision History

    SiUS331708EC Revision History 3. Revision History Month / Year Version Revised contents 08 / 2017 SiUS331708E First edition 09 / 2018 SiUS331708EA Model addition: FXZQ05-18TAVJU, FXSQ05-54TAVJU 03 / 2020 SiUS331708EB Model addition: RXSQ24-60TAVJUA Model addition: 11 / 2022 SiUS331708EC RXSQ24-60TBVJUA, FXZQ05-18TBVJU, FXUQ18-36PAVJU, FXSQ05-54TBVJU, FXMQ15-54TBVJU, BRC1H71W Introduction...

  • Page 16: Part 1 General Information

    SiUS331708EC Part 1 General Information 1. Model Names and Power Supply..............10 1.1 Outdoor Unit ....................10 1.2 Indoor Unit....................10 1.3 Air Treatment Equipment ................11 2. External Appearance.................12 2.1 Outdoor Unit ....................12 2.2 Indoor Unit....................12 2.3 Air Treatment Equipment ................13 3.

  • Page 17: Model Names And Power Supply

    SiUS331708EC Model Names and Power Supply 1. Model Names and Power Supply Outdoor Unit Capacity range (ton) Power supply, Standard Capacity index Heat Pump 24TA 36TA 48TA 60TA RXSQ 24TA 36TA 48TA 60TA VJUA 24TB 36TB 48TB 60TB VJ: 1 phase, 208/230 V, 60 Hz U(VJU): Standard symbol A: Minor revision Indoor Unit...

  • Page 18: Air Treatment Equipment

    Model Names and Power Supply SiUS331708EC Air Treatment Equipment Outdoor-Air Processing Unit Power supply, Series Model name Standard FXMQ 48MF 72MF Energy Recovery Ventilator (VAM series) Power supply, Series Model name Standard 300G 470G 600G 1200G VJ: 1 phase, 208/230 V, 60 Hz U(VJU): Standard symbol Part 1 General Information...

  • Page 19: External Appearance

    SiUS331708EC External Appearance 2. External Appearance Outdoor Unit 2, 3, 4 ton 5 ton RXSQ24TAVJU RXSQ24TBVJUA RXSQ60TAVJU RXSQ60TBVJUA RXSQ24TAVJUA RXSQ36TBVJUA RXSQ60TAVJUA RXSQ36TAVJU RXSQ48TBVJUA RXSQ36TAVJUA RXSQ48TAVJU RXSQ48TAVJUA Indoor Unit Ceiling mounted cassette (Round flow with sensing) type 4-way ceiling mounted cassette (2’×2’) type...

  • Page 20: Air Treatment Equipment

    External Appearance SiUS331708EC Slim ceiling mounted duct type Wall mounted type FXDQ-M FXAQ-P MSP concealed ducted type Floor standing type FXSQ-TA FXLQ-M FXSQ-TB Ceiling mounted duct type (Middle and high static pressure) Concealed floor standing type FXMQ-PB FXNQ-M Ceiling mounted duct type (High static pressure) Air handling unit FXMQ-TB FXTQ-TA...

  • Page 21: Capacity Range

    Connection ratio = Capacity index of the outdoor units Max. connection ratio Type Min. connection ratio Types of connected indoor units VRV indoor units Single outdoor unit 130% Outdoor Unit Combinations RXSQ24TAVJU RXSQ36TAVJU RXSQ48TAVJU RXSQ60TAVJU Model RXSQ24TAVJUA RXSQ36TAVJUA RXSQ48TAVJUA RXSQ60TAVJUA RXSQ24TBVJUA...

  • Page 22: Specifications

    Specifications SiUS331708EC 4. Specifications Model name RXSQ24TAVJU RXSQ36TAVJU Power supply 1 phase, 208/230 V, 60 Hz 1 phase, 208/230 V, 60 Hz 1 Cooling capacity Nominal 24,000 (7.0) 36,000 (10.6) Btu/h (kW) Rated 23,000 (6.7) 34,200 (10.0) 2 Heating capacity Nominal 27,000 (7.9)
  • Page 23 SiUS331708EC Specifications Model name RXSQ48TAVJU RXSQ60TAVJU Power supply 1 phase, 208/230 V, 60 Hz 1 phase, 208/230 V, 60 Hz 1 Cooling capacity Nominal 48,000 (14.1) 57,500 (16.9) Btu/h (kW) Rated 45,500 (13.3) 57,500 (16.9) 2 Heating capacity Nominal 52,000 (15.2) 57,000 (16.7) Btu/h (kW)
  • Page 24 Specifications SiUS331708EC Model name RXSQ24TAVJUA RXSQ36TAVJUA Power supply 1 phase, 208/230 V, 60 Hz 1 phase, 208/230 V, 60 Hz 1 Cooling capacity Nominal 24,000 (7.0) 36,000 (10.6) Btu/h (kW) Rated 23,000 (6.7) 34,200 (10.0) 2 Heating capacity Nominal 27,000 (7.9) 40,000 (11.7) Btu/h Rated...
  • Page 25 SiUS331708EC Specifications Model name RXSQ48TAVJUA RXSQ60TAVJUA Power supply 1 phase, 208/230 V, 60 Hz 1 phase, 208/230 V, 60 Hz 1 Cooling capacity Nominal 48,000 (14.1) 57,500 (16.9) Btu/h (kW) Rated 45,500 (13.3) 57,500 (16.9) 2 Heating capacity Nominal 52,000 (15.2) 57,000 (16.7) Btu/h (kW)
  • Page 26 Specifications SiUS331708EC Model name RXSQ24TBVJUA RXSQ36TBVJUA Power supply 1 phase, 208/230 V, 60 Hz 1 phase, 208/230 V, 60 Hz 1 Cooling capacity Nominal 24,000 (7.0) 36,000 (10.6) Btu/h Rated (Non-ducted) 23,000 (6.7) 34,200 (10.0) (kW) Rated (Ducted) 23,000 (6.7) 34,200 (10.0) 2 Heating capacity Nominal...
  • Page 27 SiUS331708EC Specifications Model name RXSQ48TBVJUA RXSQ60TBVJUA Power supply 1 phase, 208/230 V, 60 Hz 1 phase, 208/230 V, 60 Hz 1 Cooling capacity Nominal 48,000 (14.1) 57,500 (16.9) Btu/h Rated (Non-ducted) 45,500 (13.3) 57,500 (16.9) (kW) Rated (Ducted) 45,500 (13.3) 57,500 (16.9) 2 Heating capacity Nominal...

  • Page 28: Part 2 Refrigerant Circuit

    SiUS331708EC Part 2 Refrigerant Circuit 1. Refrigerant Circuit (Piping Diagrams) ............22 1.1 Outdoor Unit ....................22 1.2 Indoor Unit....................31 1.3 Outdoor-Air Processing Unit............... 34 2. Functional Parts Layout ................35 2.1 RXSQ24/36TAVJU..................35 2.2 RXSQ24/36TAVJUA, RXSQ24/36TBVJUA ..........37 2.3 RXSQ48TAVJU..................39 2.4 RXSQ48TAVJUA, RXSQ48TBVJUA ............

  • Page 29: Refrigerant Circuit (Piping Diagrams)

    SiUS331708EC Refrigerant Circuit (Piping Diagrams) 1. Refrigerant Circuit (Piping Diagrams) Outdoor Unit 1.1.1 24/36 Class No. in Electric piping Name Function symbol diagram Compressor Compressor is operated on frequencies between 16 rps and 100.5 rps by using the inverter. Fan motor Because the system is of an air heat exchange type, the fan is operated at 8-step rotation speed by using the inverter.
  • Page 30 Refrigerant Circuit (Piping Diagrams) SiUS331708EC RXSQ24/36TAVJU Part 2 Refrigerant Circuit...
  • Page 31 SiUS331708EC Refrigerant Circuit (Piping Diagrams) RXSQ24/36TAVJUA, RXSQ24/36TBVJUA Part 2 Refrigerant Circuit...
  • Page 32 Refrigerant Circuit (Piping Diagrams) SiUS331708EC 1.1.2 48 Class No. in Electric piping Name Function symbol diagram Compressor Compressor is operated on frequencies between 15 rps and 109 rps by using the inverter. Fan motor Because the system is of an air heat exchange type, the fan is operated at 8-step rotation speed by using the inverter.
  • Page 33 SiUS331708EC Refrigerant Circuit (Piping Diagrams) RXSQ48TAVJU Part 2 Refrigerant Circuit...
  • Page 34 Refrigerant Circuit (Piping Diagrams) SiUS331708EC RXSQ48TAVJUA, RXSQ48TBVJUA Part 2 Refrigerant Circuit...
  • Page 35 SiUS331708EC Refrigerant Circuit (Piping Diagrams) 1.1.3 60 Class No. in Electric piping Name Function symbol diagram Compressor Compressor is operated on frequencies between 15 rps and 109 rps by using the inverter. Fan motor Because the system is of an air heat exchange type, the fan is operated at 8-step rotation speed by using the inverter.
  • Page 36 Refrigerant Circuit (Piping Diagrams) SiUS331708EC RXSQ60TAVJU Part 2 Refrigerant Circuit...
  • Page 37 SiUS331708EC Refrigerant Circuit (Piping Diagrams) RXSQ60TAVJUA, RXSQ60TBVJUA Part 2 Refrigerant Circuit...

  • Page 38: Indoor Unit

    Refrigerant Circuit (Piping Diagrams) SiUS331708EC Indoor Unit Symbol No. in Except piping Name Function FXMQ-PB, FXTQ-TA FXMQ-PB diagram FXTQ-TA, CXTQ-TA CXTQ-TA Electronic expansion Used for gas superheating degree control valve while in cooling or subcooling degree control while in heating. Suction air thermistor R1T (1) Used for thermostat control.
  • Page 39 SiUS331708EC Refrigerant Circuit (Piping Diagrams)  FXUQ-P, FXEQ-P, FXSQ-TA, FXAQ-P, FXLQ-M, FXNQ-M  FXUQ-PA Gas piping connection port Indoor heat exchanger Liquid piping connection port Filter Filter C: 4D034245R C: 4D133246  FXSQ-TB, FXMQ-TB  FXDQ-M Gas piping connection port Liquid piping connection port Filter Filter C: 4D141716...
  • Page 40 Refrigerant Circuit (Piping Diagrams) SiUS331708EC  CXTQ-TA Gas piping connection port Indoor heat exchanger Liquid piping connection port Filter Filter Part 2 Refrigerant Circuit...

  • Page 41: Outdoor-Air Processing Unit

    SiUS331708EC Refrigerant Circuit (Piping Diagrams) Outdoor-Air Processing Unit FXMQ48/72MFVJU Gas pipe connection port Heat exchanger Filter Capillary tube Distributor Solenoid valve Liquid pipe connection port Check valve Filter Filter Electronic expansion valve C: 4D018650D No. in piping Electric symbol Name Function diagram Electronic expansion valve...

  • Page 42: Functional Parts Layout

    Functional Parts Layout SiUS331708EC 2. Functional Parts Layout RXSQ24/36TAVJU Top view Low pressure sensor (S1NPL) High pressure sensor (S1NPH) Thermistor (Suction pipe 2) (R5T) Front view Solenoid valve coil (Hot gas) (Y2S) Four way valve coil (Y1S) Solenoid valve coil (Unload circuit) (Y3S) Fan motor...
  • Page 43 SiUS331708EC Functional Parts Layout Side view Four way valve (Y1S) Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P342997N Part 2 Refrigerant Circuit...

  • Page 44: Rxsq24/36Tavjua, Rxsq24/36Tbvjua

    Functional Parts Layout SiUS331708EC RXSQ24/36TAVJUA, RXSQ24/36TBVJUA Top view Low pressure sensor (S1NPL) High pressure sensor (S1NPH) Thermistor (Suction pipe 2) (R5T) Front view Solenoid valve coil (Hot gas) (Y2S) Four way valve coil (Y1S) Solenoid valve coil (Unload circuit) (Y3S) Fan motor (M1F) Thermistor...
  • Page 45 SiUS331708EC Functional Parts Layout Side view Four way valve (Y1S) Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P589934F Part 2 Refrigerant Circuit...

  • Page 46: Rxsq48Tavju

    Functional Parts Layout SiUS331708EC RXSQ48TAVJU Front view Four way valve (Y1S) Four way valve coil (Y1S) Low pressure sensor Thermistor (Suction pipe 2) (S1NPL) (R5T) Solenoid valve (Unload circuit) coil Thermistor (Discharge pipe) (Y3S) (R2T) High pressure switch Thermistor (Liquid pipe) (S1PH) (R7T) High pressure sensor...
  • Page 47 SiUS331708EC Functional Parts Layout Side view Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P374828V Part 2 Refrigerant Circuit...

  • Page 48: Rxsq48Tavjua, Rxsq48Tbvjua

    Functional Parts Layout SiUS331708EC RXSQ48TAVJUA, RXSQ48TBVJUA Front view Four way valve (Y1S) Four way valve coil (Y1S) Low pressure sensor Thermistor (Suction pipe 2) (S1NPL) (R5T) Solenoid valve (Unload circuit) coil Thermistor (Discharge pipe) (Y3S) (R2T) High pressure switch Thermistor (Liquid pipe) (S1PH) (R7T) High pressure sensor...
  • Page 49 SiUS331708EC Functional Parts Layout Side view Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P589935E Part 2 Refrigerant Circuit...

  • Page 50: Rxsq60Tavju

    Functional Parts Layout SiUS331708EC RXSQ60TAVJU Front view Fan motor (M1F) Four way valve coil (Y1S) Thermistor (Suction pipe 2) (R5T) Thermistor (Discharge pipe) (R2T) Fan motor Low pressure sensor (M2F) (S1NPL) High pressure sensor (S1NPH) High pressure switch (S1PH) Compressor (M1C) Crankcase heater (E1HC)

  • Page 51: Functional Parts Layout

    SiUS331708EC Functional Parts Layout Side view Thermistor (Subcooling heat exchanger gas pipe) (R6T) Thermistor (Suction pipe 1) (R3T) Thermistor (Outdoor air) (R1T) Electronic expansion valve/coil (Main) (Y1E) Electronic expansion valve/coil (Subcooling) (Y3E) Thermistor (Liquid pipe) (R7T) Thermistor (Heat exchanger deicer) (R4T) C: 1P441643P Part 2 Refrigerant Circuit...

  • Page 52: Rxsq60Tavjua, Rxsq60Tbvjua

    Functional Parts Layout SiUS331708EC RXSQ60TAVJUA, RXSQ60TBVJUA Front view Fan motor (M1F) Four way valve coil (Y1S) Thermistor (Suction pipe 2) (R5T) Thermistor (Discharge pipe) (R2T) Fan motor Low pressure sensor (M2F) (S1NPL) High pressure sensor (S1NPH) High pressure switch (S1PH) Compressor (M1C) Crankcase heater...
  • Page 53 SiUS331708EC Functional Parts Layout Side view Thermistor (Subcooling heat exchanger gas pipe) (R6T) Thermistor (Suction pipe 1) (R3T) Thermistor (Outdoor air) (R1T) Electronic expansion valve/coil (Main) (Y1E) Electronic expansion valve/coil (Subcooling) (Y3E) Thermistor (Liquid pipe) (R7T) Thermistor (Heat exchanger deicer) (R4T) C: 1P589937E Part 2 Refrigerant Circuit...

  • Page 54: Part 3 Remote Controller

    SiUS331708EC Part 3 Remote Controller 1. Applicable Models ..................48 2. Names and Functions ................49 2.1 BRC1E73 ....................49 2.2 BRC1H71W....................52 2.3 Wireless Remote Controller ............... 60 3. Main/Sub Setting..................61 3.1 BRC1E73 ....................61 3.2 BRC1H71W....................63 3.3 When Wireless Remote Controller is Used Together......... 65 4.

  • Page 55: Applicable Models

    SiUS331708EC Applicable Models 1. Applicable Models Wired remote controller Series Wireless remote controller Navigation Madoka FXFQ-T — FXFQ-P BRC082A42W (for BYFQ60C3W1W) FXZQ-TA BRC082A42S (for BYFQ60C3W1S) BRC082A41W (for BYFQ60B3W1) BRC082A42W (for BYFQ60C3W2W) FXZQ-TB BRC082A41W (for BYFQ60B3W1) FXZQ-M BRC7E830 FXUQ-P FXUQ-PA — FXEQ-P FXDQ-M BRC4C82...

  • Page 56: Names And Functions

    Names and Functions SiUS331708EC 2. Names and Functions BRC1E73 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10. Cancel button 2.
  • Page 57 SiUS331708EC Names and Functions 4. Up button  Used to raise the setpoint.  The item above the current selection will be highlighted. (The highlighted items will be scrolled continuously when the button is continuously pressed.)  Used to change the selected item. 5.

  • Page 58: Service Check Function

    Names and Functions SiUS331708EC Service Check Function <Main Menu> Main Menu • Airflow Direction Airflow Direction • Individual Airflow Direction Individual Airflow Direction • Ventilation Ventilation • Schedule Schedule • Off Timer Off Timer • Celsius / Fahrenheit Celsius / Fahrenheit •...

  • Page 59: Brc1H71W

    SiUS331708EC Names and Functions BRC1H71W 2.2.1 Button Locations and Descriptions ON/OFF button • Press this button to turn on the system. • Press this button again to turn off the system. b Status indicator (LED) • During operation, the light ring around the display lights up blue/red/green. Lights up blue: Operating, Blinks red: Error is occurring, Lights up/blinks green: Bluetooth connecting c LCD •...

  • Page 60: Overview Of Screens

    Names and Functions SiUS331708EC 2.2.2 Overview of Screens The following is just an example. The items available for setting vary depending on the indoor unit you are using. If there is no button operation for about 10 seconds, the screen returns to the home screen.
  • Page 61 SiUS331708EC Names and Functions 2.2.3 Setting Screen List Setting list Installer User Administrator menu menu menu Icon Name Description Depends on Operation Mode Operation mode setting current setting Depends on Fan Speed Airflow rate setting current setting Depends on Airflow Direction Airflow direction 1 setting current setting Depends on...
  • Page 62 Names and Functions SiUS331708EC Setting list Installer User Administrator menu menu menu Icon Name Description Bluetooth Setting Bluetooth setting Backlight Backlight brightness setting Contrast Contrast setting Clock Setting Clock setting Scale reference temperature Standard Temp setting About Administrator information Administrator password Admin Password setting Installer Password...
  • Page 63 Bluetooth SIG, Inc. and use of such marks by r Settings menu name Daikin industries, LTD. is under license. Other trademarks and trade names are those of their respective owners. s Settings menu icon INFORMATION Depending on the connected model, some items may not be displayed.
  • Page 64 Names and Functions SiUS331708EC Home screen list There are 4 types of home screen. The home screen type can be changed by the remote controller setting. Text mode Icon mode Auto Cool ˚F Room Text mode (Scale screen) Icon mode (Scale screen) Auto Cool Cool Warm...

  • Page 65: Information Screen

    SiUS331708EC Names and Functions 2.2.5 Information Screen The functions of the connected indoor unit are displayed as icons. How to display the information screen Home screen Press and hold on the Home screen for 5 Auto Cool ˚F seconds. Room Text mode Icon mode Information screen...
  • Page 66 * The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and use of such marks by Daikin industries, LTD. is under license. Other trademarks and trade names are those of their respective owners.

  • Page 67: Wireless Remote Controller

    SiUS331708EC Names and Functions Wireless Remote Controller ON OFF DOWN ON OFF TEMP TIME DOWN RESERVE CANCEL TIMER TEST MODE SWING TEST TEST DISPLAY (SIGNAL TRANSMISSION) FAN SPEED CONTROL BUTTON Press this button to select the fan speed, HIGH or This lights up when a signal is being transmitted.

  • Page 68: Main/Sub Setting

    Main/Sub Setting SiUS331708EC 3. Main/Sub Setting BRC1E73 Situation The Main/Sub setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to Main and the other to Sub.
  • Page 69 SiUS331708EC Main/Sub Setting 3.1.2 When an Error Occurred U5: there are 2 main remote controllers when power is turned ON Change the setting from Main to Sub on the remote controller you want to be Sub. U8: there are 2 sub remote controllers when power is turned ON Change the setting from Sub to Main on the remote controller you want to be Main.

  • Page 70: Brc1H71W

    Main/Sub Setting SiUS331708EC BRC1H71W 3.2.1 Main and Sub Controller a Outdoor unit b Indoor unit c Main remote controller d Sub remote controller • On the information screen, main/sub status is indicated by the following icons: Icon Description Main INFORMATION It is only possible to use a main and a sub controller of the same type.
  • Page 71 SiUS331708EC Main/Sub Setting 3.2.2 Designating a Controller as Main or Sub Prerequisite: A remote controller is already connected to the indoor unit. Connect a second controller. After turning on the power, perform setting of the second controller. Result: It will start up automatically. Home screen Wait for a U5 or U8 error code to appear on the screen.

  • Page 72: When Wireless Remote Controller Is Used Together

    Main/Sub Setting SiUS331708EC When Wireless Remote Controller is Used Together When using both a wired and a wireless remote controller for 1 indoor unit, the wired controller should be set to Main. Therefore, the Main/Sub switch (SS1) of the signal receiver PCB must be set to Sub.

  • Page 73: Address Setting For Wireless Remote Controller

    SiUS331708EC Address Setting for Wireless Remote Controller 4. Address Setting for Wireless Remote Controller If setting multiple wireless remote controllers to operate in one room, perform address setting for the receiver and the wireless remote controller. (This includes an individual remote controller control using the group operation.) (For the wiring for the group operation, please refer to the installation manual attached to the indoor unit.) Setting for signal receiver PCB...
  • Page 74 Address Setting for Wireless Remote Controller SiUS331708EC 5. Press INSPECTION/TEST button for 1 second to return to normal mode. UP button DOWN button Field setting mode FAN button RESERVE button Address Multiple setting FILTER SIGN RESET button INSPECTION/TEST button Multiple Settings A/b The command such as operation mode or temperature setting by this remote controller will be rejected when the target indoor unit operation is restricted as by an external control such as centralized control.

  • Page 75: Centralized Control Group No. Setting

    SiUS331708EC Centralized Control Group No. Setting 5. Centralized Control Group No. Setting BRC1E73 In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller.
  • Page 76 Centralized Control Group No. Setting SiUS331708EC Note(s)  For setting group No. of Energy recovery ventilator and wiring adaptor for other air conditioners, etc., refer to the instruction manual. NOTICE Enter the group No. and installation place of the indoor unit into the installation table. Be sure to keep the installation table with the operation manual for maintenance.

  • Page 77: Brc1H71W

    SiUS331708EC Centralized Control Group No. Setting BRC1H71W Group Address • Assign the group address and unit number for centralized control. • The group and unit address can only be set when a centralized controller is connected. This menu is only visible when a centralized controller is connected. •...

  • Page 78: Group No. Setting Example

    Centralized Control Group No. Setting SiUS331708EC 5. Press INSPECTION/TEST button and return to the normal mode. UP button Mode No. Field setting mode DOWN button RESERVE button MODE button Group No. INSPECTION/TEST button Group No. Setting Example Outdoor unit Indoor/Outdoor F1 F2 F1 F2 P1 P2...

  • Page 79: Service Settings Menu, Maintenance Menu

    SiUS331708EC Service Settings Menu, Maintenance Menu 6. Service Settings Menu, Maintenance Menu BRC1E73 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press and hold the Press the Cancel Cancel button button once.

  • Page 80: Service Settings Menu

    Service Settings Menu, Maintenance Menu SiUS331708EC 6.1.1 Service Settings Menu Service settings menu Item 2 Remarks Test Operation — — Maintenance Contact None — Maintenance Contact —, 0 to 9 (in order) Field Settings Indoor Unit No. — Mode No. —...

  • Page 81: Maintenance Menu

    SiUS331708EC Service Settings Menu, Maintenance Menu 6.1.2 Maintenance Menu Maintenance Menu Item 2 Remarks Model Name Unit No. Select the unit number you want to check. Indoor unit The model names are displayed. (A model code may be displayed instead, depending Outdoor unit on the particular model.) Operation Hours...
  • Page 82 Service Settings Menu, Maintenance Menu SiUS331708EC Maintenance Menu Item 2 Remarks Forced Defrost Forced defrost ON Enables the forced defrost operation. Forced defrost OFF Disables the forced defrost operation. Error Display Display error ON Displays the error on the screen. Display error OFF Displays neither errors nor warnings.

  • Page 83: Administrator Menu, Installer Menu

    SiUS331708EC Administrator Menu, Installer Menu 7. Administrator Menu, Installer Menu BRC1H71W Refer to page 54 for details. Part 3 Remote Controller...

  • Page 84: Part 4 Functions And Control

    SiUS331708EC Part 4 Functions and Control 1. Operation Mode ..................79 2. Basic Control.....................80 2.1 Normal Operation ..................80 2.2 Compressor PI Control................81 2.3 Electronic Expansion Valve PI Control............83 2.4 Cooling Operation Fan Control..............83 3. Special Control..................84 3.1 Startup Control ................... 84 3.2 Oil Return Control..................
  • Page 85 SiUS331708EC 6.16 Fan Control (Heater Residual) (FXTQ-TA Models) ........123 6.17 Interlocked with External Equipment (FXTQ-TA and CXTQ-TA Models)... 123 Part 4 Functions and Control...

  • Page 86: Operation Mode

    Operation Mode SiUS331708EC 1. Operation Mode Operation in stop control Indoor unit stop or Indoor unit thermostat ON thermostat OFF Error/Standby Restart standby Pressure (Compressor stop) equalization prior to startup Error/ Standby Indoor unit stop or thermostat OFF Startup control •...

  • Page 87: Basic Control

    SiUS331708EC Basic Control 2. Basic Control Normal Operation Cooling Operation Electric symbol Outdoor unit actuator Operation Remarks 24/36 class 48 class 60 class Compressor Compressor PI Used for high pressure protection control, control low pressure protection control, discharge pipe temperature protection control, and compressor operating frequency upper limit control with inverter protection control.

  • Page 88: Compressor Pi Control

    Basic Control SiUS331708EC Compressor PI Control Carries out compressor capacity PI control to maintain Te at constant during cooling operation and Tc at constant during heating operation, thus ensuring stable unit performance. Te: Low pressure equivalent saturation temperature TeS: Target Te value (varies depending on Te setting, operating frequency, etc.) Tc: High pressure equivalent saturation temperature TcS: Target Tc value (varies depending on Tc setting, operating frequency, etc.) Cooling...
  • Page 89 SiUS331708EC Basic Control Compressor Frequency Frequency (rps) Step 24 class 36 class 48 class 60 class Cooling Heating Cooling Heating Cooling Heating Cooling Heating 17.5 17.5 17.5 17.5 17.5 17.5 17.5 17.5 20.5 20.5 20.5 20.5 20.5 20.5 20.5 20.5 24.5 28.5 28.5...

  • Page 90: Electronic Expansion Valve Pi Control

    Basic Control SiUS331708EC Electronic Expansion Valve PI Control Main Electronic Expansion Valve Control Carries out main electronic expansion valve (Y1E) PI control to maintain the evaporator outlet superheating degree (SH) at constant during heating operation, thus making maximum use of the outdoor heat exchanger (evaporator).

  • Page 91: Special Control

    SiUS331708EC Special Control 3. Special Control Startup Control This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.

  • Page 92: Startup Control In Heating

    Special Control SiUS331708EC 3.1.2 Startup Control in Heating Electric Symbol Startup control Outdoor unit Pressure equalization 24/36 actuator control prior to startup STEP 1 STEP 2 class class class Compressor 0 Hz Minimum frequency Increases 2 steps every 20 seconds from minimum frequency until Pc –...

  • Page 93: Oil Return Control

    SiUS331708EC Special Control Oil Return Control In order to prevent the compressor from running out of oil, oil return control is conducted to recover oil that has flowed out from the compressor to the system side. HTdi: Compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature Pc: High pressure sensor detection value Pe: Low pressure sensor detection value Tc: High pressure equivalent saturation temperature...
  • Page 94 Special Control SiUS331708EC 3.2.2 Oil Return Control in Heating Pc: High pressure sensor detection value Pe: Low pressure sensor detection value Tc: High pressure equivalent saturation temperature Te: Low pressure equivalent saturation temperature Ts1: Suction pipe temperature detected by thermistor R3T Tb: Heat exchanger temperature Starting ...

  • Page 95: Defrost Control

    SiUS331708EC Special Control Defrost Control Pc: High pressure sensor detection value Pe: Low pressure sensor detection value Tb: Heat exchanger deicer temperature Tc: High pressure equivalent saturation temperature Te: Low pressure equivalent saturation temperature Ts1: Suction pipe temperature detected by thermistor R3T Defrost control is performed to melt frost on the outdoor heat exchanger when heating, and thus recover heating capacity.

  • Page 96: Pump Down Residual Control

    Special Control SiUS331708EC Pump Down Residual Control If liquid refrigerant is retained in the evaporator when the compressor is activated, the liquid refrigerant enters the compressor and dilutes oil therein resulting in a decrease of lubricity. Therefore, pump down residual control is performed to collect the refrigerant retained in the evaporator when the compressor stops.

  • Page 97: Restart Standby

    SiUS331708EC Special Control Restart Standby Restart is forced into standby to prevent the power from frequently turning on and off and to equalize pressure in the refrigerant system. Ta: Outdoor air temperature Electric symbol Outdoor unit actuator Operation 24/36 class class class Compressor...

  • Page 98: Protection Control

    Protection Control SiUS331708EC 4. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to an abnormal increase of high pressure and to protect compressors against the transient increase of high pressure.

  • Page 99: Low Pressure Protection Control

    SiUS331708EC Protection Control Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. Pe: Low pressure sensor detection value Cooling Operation Low pressure not limited Pe < 0.34 MPa Pe >...

  • Page 100: Discharge Pipe Temperature Protection Control

    Protection Control SiUS331708EC Discharge Pipe Temperature Protection Control This discharge pipe temperature protection control is used to protect the compressor internal temperature against an error or transient increase of discharge pipe temperature. HTdi: Value of inverter compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature Tp: Value of compressor port temperature calculated by Tc, Te, and suction superheating degree.

  • Page 101: Inverter Protection Control

    SiUS331708EC Protection Control Inverter Protection Control Inverter current protection control and radiation fin temperature control are performed to prevent tripping due to an error, or transient inverter overcurrent, and radiation fin temperature increase. Tfin: Radiation fin temperature Inverter overcurrent protection control Not limited •...
  • Page 102 Protection Control SiUS331708EC According to the current limit of direct current Not limited Compressor stopped Existing DC power limit No DC power limit requirement. • requirement. Compressor upper limit : Maximum frequency • Limited Inverter upper limit frequency: 1-step down from current compressor frequency Existing DC power 10 seconds...

  • Page 103: Other Control

    SiUS331708EC Other Control 5. Other Control Demand Operation In order to reduce power consumption, the outdoor unit capacity is reduced forcibly with control by using Demand Setting 1. To enable this operation, the additional setting of Constant Demand Setting is required. Demand setting 1 Level Standard for upper limit of power consumption...

  • Page 104: Outline Of Control (Indoor Unit)

    Outline of Control (Indoor Unit) SiUS331708EC 6. Outline of Control (Indoor Unit) Operation Flowchart Cooling Operation Start (Option) Turn ON Aux. electric : OFF power supply ∗4 heater Humidifier : OFF Initialize electronic expansion valve Swing flap Detect louver lock prevention condition? The previous settings of airflow LED in remote...
  • Page 105 SiUS331708EC Outline of Control (Indoor Unit) ∗10 Program dry operation Fan Operation Program ∗8 Drain dry display : OFF pump kit (Option) ∗9 Aux. ∗4 : OFF electric heater Thermostat status (Option) Humidifier : OFF : Operating in L mode after it stops for 6 min. Operating in L mode Electronic YE :...
  • Page 106 Outline of Control (Indoor Unit) SiUS331708EC Heating Operation Drain : OFF pump kit Swing flap? Set wind direction Swing flap Is test run in progress? defrost conditions for gas operation in furnace operation Depends on the intensity progress? established? of gas combustion. (Option) Aux.
  • Page 107 SiUS331708EC Outline of Control (Indoor Unit) prevention operation will be conducted. If the evaporator inlet temperature is kept at not less than 7°C (44.6°F) for a consecutive period of 10 min., the freeze-up prevention operation will be reset. 6. Thermostat status Set temperature a = b = 1°C (1.8°F) or 0.5°C (0.9°F) The values a and b depend on the field setting 12(22)-2.

  • Page 108: Set Temperature And Control Target Temperature

    Outline of Control (Indoor Unit) SiUS331708EC Set Temperature and Control Target Temperature 6.2.1 Without Optional Infrared Floor Sensor The relationship between remote controller set temperature and control target temperature is described below.  When the suction air thermistor is used for controlling (Default), the control target temperature is determined as follows to prevent insufficient heating in heating operation.

  • Page 109: With Optional Infrared Floor Sensor

    SiUS331708EC Outline of Control (Indoor Unit) 6.2.2 With Optional Infrared Floor Sensor The relationship between remote controller set temperature and control target temperature is described below.  The temperature difference for cooling  heating mode switching is 5°C (9°F).  When using the floor temperature as the control target, the remote controller set temperature is equal to the actual control target temperature in heating operation.

  • Page 110: Remote Controller Thermistor

    Outline of Control (Indoor Unit) SiUS331708EC Remote Controller Thermistor Temperature is controlled by both the remote controller thermistor and suction air thermistor for the indoor unit. (This is however limited to when the field setting for the remote controller thermistor is set to Use.) Note(s) When fresh air intake kit is used, outdoor air is mixed with indoor air, and the room temperature...
  • Page 111 SiUS331708EC Outline of Control (Indoor Unit)  Assuming suction temperature has changed from 30°C (86°F) to 18°C (64°F) (F A): Suction air thermistor is used for temperatures from 30C (86F) to 25C (77F) (F  D). Remote controller thermistor is used for temperatures from 25C (77F) to 21C (70F) (D B). Suction air thermistor is used for temperatures from 21C (70F) to 18C (64F) (B...

  • Page 112: Thermostat Control

    Outline of Control (Indoor Unit) SiUS331708EC Thermostat Control 6.4.1 Without Optional Infrared Floor Sensor Whether the thermostat is turned ON or OFF is determined by the difference between the remote controller set temperature and the actual detected room temperature (1). Differential value Model FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-M, FXUQ-P, FXEQ-P, FXSQ-TA, FXHQ-M,...
  • Page 113 SiUS331708EC Outline of Control (Indoor Unit) 6.4.2 With Optional Infrared Floor Sensor Whether the thermostat is turned on or off is determined by the difference between the remote controller set temperature and the detected temperature around people. Normal operation  Cooling operation ΔT ≤...

  • Page 114: Thermostat Control With Operation Mode Set To Auto

    Outline of Control (Indoor Unit) SiUS331708EC 6.4.3 Thermostat Control with Operation Mode Set to AUTO The system will conduct this temperature control shown below, only when the wireless remote controller or any central remote controller is connected. Furthermore, setting changes of the differential value (D) can be made. : Factory setting Second code No.

  • Page 115: Drain Pump Control

    SiUS331708EC Outline of Control (Indoor Unit) Drain Pump Control 6.5.1 Normal Operation Float switch Thermostat (running) Error display Drain pump 5 min.  The float switch is ON in normal operation.  When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. ...
  • Page 116 Outline of Control (Indoor Unit) SiUS331708EC 6.5.3 If the Float Switch is OFF with the Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec.  When the float switch turns OFF, the drain pump turns ON simultaneously. ...

  • Page 117: Control Of Electronic Expansion Valve

    SiUS331708EC Outline of Control (Indoor Unit) Control of Electronic Expansion Valve Electronic expansion valves in indoor units have the functions of conducting superheating degree control in cooling operation and subcooling degree control in heating operation. However, if the indoor units receive any control command such as a protection control command or a special control command from the outdoor unit, the units will give a priority to the control command.

  • Page 118: Freeze-Up Prevention

    Outline of Control (Indoor Unit) SiUS331708EC Freeze-Up Prevention Freeze-Up Prevention by Off Cycle (Indoor Unit) When the temperature detected by the liquid pipe temperature thermistor of the indoor heat exchanger drops too low, the unit enters freeze-up prevention control in accordance with the following conditions, and is also set in accordance with the conditions given below.
  • Page 119 SiUS331708EC Outline of Control (Indoor Unit) Note(s) When the indoor unit is FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXZQ-M, FXUQ-P, or FXUQ-PA, if the air outlet is set as dual-directional or tri-directional, the starting conditions will be changed as follows. Liquid pipe temperature ≤ 1°C (33.8°F) (for total of 15 minutes) Liquid pipe temperature ≤...

  • Page 120: List Of Swing Flap Operations

    Outline of Control (Indoor Unit) SiUS331708EC List of Swing Flap Operations Swing flaps operate as shown in table below. Flap FXFQ-T FXEQ-P FXHQ-M FXAQ-P FXFQ-P Hot start from defrost Swing Horizontal Horizontal Horizontal Horizontal operation Airflow direction set Horizontal Horizontal Horizontal Horizontal Defrost operation...

  • Page 121: Hot Start Control (In Heating Operation Only)

    SiUS331708EC Outline of Control (Indoor Unit) Hot Start Control (In Heating Operation Only) At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor fan is controlled to prevent cold air from blasting out and ensure startup capacity. TH2: Temperature detected with the gas thermistor Tc : High pressure equivalent saturated temperature Starting condition...

  • Page 122: Louver Control For Preventing Ceiling Dirt

    Outline of Control (Indoor Unit) SiUS331708EC 6.10 Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of in which air direction can be adjusted in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.

  • Page 123: Heater Control (Except Fxtq-Ta Models)

    SiUS331708EC Outline of Control (Indoor Unit) 6.11 Heater Control (Except FXTQ-TA Models) Note(s) Optional PCB KRP1B... is required. The heater control is conducted in the following manner. Normal control While in heating, the heater control (ON/OFF) is conducted as shown below. Set temperature 2˚C 2˚C...

  • Page 124: Heater Control (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS331708EC 6.12 Heater Control (FXTQ-TA Models) Note(s) Optional heater kit HKS... is required. For FXTQ-TA models, heater ON/OFF output from wiring adaptor interlocks with the operation of heater kit HKS….(When the heater 1 turns ON/OFF, heater output of wiring adaptor turns ON/OFF.) Fan residual operation also interlocks with the fan residual operation of heater kit HKS….
  • Page 125 SiUS331708EC Outline of Control (Indoor Unit) Condition A • No fan motor system error • High pressure condition: ON (∗1) • Liquid pipe temperature condition: ON (∗2) • Heater ON permission (Defrost/oil Return): 0 (∗4) & & • Not during defrost/oil return •...
  • Page 126 Outline of Control (Indoor Unit) SiUS331708EC 6.12.2 Heat Pump Lockout Control For heating operation, users can select to use electric heater. For this, signals are sent using ABC terminal of outdoor unit PCB. When the hot-water heating signal is received from the outdoor unit PCB, heating operation is performed only with the electric heater as manual backup operation.

  • Page 127: Gas Furnace Control (Cxtq-Ta Models)

    SiUS331708EC Outline of Control (Indoor Unit) 6.13 Gas Furnace Control (CXTQ-TA Models) Outline When conditions for gas furnace operation are established, the system transits into the standby mode for pre-gas furnace operation. In this status, heating operation is not performed with either heat pump or gas furnace.

  • Page 128: 3-Step Thermostat Processing (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS331708EC 6.14 3-Step Thermostat Processing (FXTQ-TA Models) Outline The thermostat ON/OFF for the indoor unit is controlled in accordance with Thermostat step 1. The heater ON/OFF operation during heating is controlled as follows. Thermostat step 2, 3: Auxiliary electric heater control Thermostat step 1, 2: Heat pump lockout control For more details of the heater, refer to Heater Control (FXTQ-TA Models) on page 117.

  • Page 129: 2-Step Thermostat Processing (Cxtq-Ta Models)

    SiUS331708EC Outline of Control (Indoor Unit) 6.15 2-Step Thermostat Processing (CXTQ-TA Models) Outline The thermostat ON/OFF of the indoor unit is controlled in accordance with Thermostat step 1. The gas furnace ON/OFF is controlled in accordance with Thermostat step 2. When gas furnace operation requiring ON signal or water heater ON signal is sent from the outdoor unit, gas furnace ON/OFF is controlled in accordance with Thermostat step 1.

  • Page 130: Fan Control (Heater Residual) (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS331708EC 6.16 Fan Control (Heater Residual) (FXTQ-TA Models) Outline If the indoor heater turned OFF from ON during heating operation, the fan will keep operating for further period of time in order to cool the heater. Detail Residual ON •...
  • Page 131 SiUS331708EC Outline of Control (Indoor Unit) 6.17.3 Economizer When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the outdoor air to save energy. This operation is called economizer operation, and the equipment to detect indoor and outdoor air temperatures and open and close the damper to perform this operation is called an economizer.

  • Page 132: Part 5 Field Settings And Test Operation

    SiUS331708EC Part 5 Field Settings and Test Operation 1. Field Setting from Remote Controller............126 1.1 BRC1E73 ....................126 1.2 BRC1H71W....................128 1.3 Wireless Remote Controller ..............131 1.4 List of Field Settings for Indoor Unit ............132 1.5 Details of Field Settings for Indoor Unit............ 136 1.6 Gas Furnace Set Up.................

  • Page 133: Field Setting From Remote Controller

    SiUS331708EC Field Setting from Remote Controller 1. Field Setting from Remote Controller Individual function of indoor unit can be changed from the remote controller. At the time of installation or after service inspection / repair, make the field setting in accordance with the following description.
  • Page 134 Field Setting from Remote Controller SiUS331708EC Press Menu/OK button. Setting confirmation screen is displayed. <Setting confirmation screen> Select Yes and press Menu/OK button. Setting details are determined and field settings screen returns. In the case of multiple setting changes, repea t (3) to (7). After all setting changes are Press Menu/OK button.

  • Page 135: Brc1H71W

    SiUS331708EC Field Setting from Remote Controller BRC1H71W Enter the Installer Menu and make settings. Installer menu screen Press button, for move to “ ”. Field Setting If Bluetooth is connected, performing field setting from the remote controller side is impossible. Disconnect Bluetooth, or perform field setting Text mode Icon mode...
  • Page 136 Field Setting from Remote Controller SiUS331708EC Sub-menu screen Press button, scroll to the desired Unit Mode 20 Mode 20 No. and then press button to set the Unit 00 Unit 00 selection. Enter Return Text mode Icon mode Sub-menu screen Press button, to select “Enter”...
  • Page 137 SiUS331708EC Field Setting from Remote Controller Sub-menu screen Press button, to scroll to the desired SW 00 SW 00 Second Code No., and then press button. – 01 – 01 Cancel Text mode Icon mode Sub-menu screen Press button, select “Set” or “ ”, and SW 00 SW 00...

  • Page 138: Wireless Remote Controller

    Field Setting from Remote Controller SiUS331708EC Wireless Remote Controller UP button Mode No. Field setting mode DOWN button RESERVE button First code No. MODE button Second code No. INSPECTION/TEST button To set the field settings, you have to change:  Mode No. ...

  • Page 139: List Of Field Settings For Indoor Unit

    SiUS331708EC Field Setting from Remote Controller List of Field Settings for Indoor Unit : Factory setting Mode First Second Code No. Reference Code Setting Contents Page (Note 2) Filter cleaning Ultra long life Approx. Approx. sign interval filter 10,000 5,000 hrs....
  • Page 140 Field Setting from Remote Controller SiUS331708EC Mode First Second Code No. Reference Code Setting Contents Page (Note 2) Setting of airflow rate Standard High ceiling 1 High ceiling 2 — Airflow direction setting 4-direction 3-direction 2-direction — airflow airflow airflow Swing pattern settings All direction Facing...
  • Page 141 SiUS331708EC Field Setting from Remote Controller First Field FXZQ-TA FXUQ-P FXSQ-TA Code Setting Modes FXFQ-T FXFQ-P FXZQ-M FXEQ-P FXDQ-M setting FXZQ-TB FXUQ-PA FXSQ-TB Filter cleaning sign interval         Filter sign setting — — —...
  • Page 142 Field Setting from Remote Controller SiUS331708EC First Field Code Setting Modes FXMQ-PB FXMQ-TB FXHQ-M FXAQ-P FXLQ-M FXNQ-M FXTQ-TA CXTQ-TA setting Filter cleaning sign interval — —       Filter sign setting — — — — — —...

  • Page 143: Details Of Field Settings For Indoor Unit

    SiUS331708EC Field Setting from Remote Controller Details of Field Settings for Indoor Unit 1.5.1 Filter Cleaning Sign Interval, Filter Type : Factory setting 10 (20)-1 01: Long life filter 02: Ultra long life filter Setting Filter contamination Light Heavy Light Heavy heavy/light 10 (20)-0 01...
  • Page 144 Field Setting from Remote Controller SiUS331708EC When the Second Code No. is set to 02, room temperature is controlled by the remote sensor thermistor. When the Second Code No. is set to 03, room temperature is controlled by the remote controller thermistor.
  • Page 145 SiUS331708EC Field Setting from Remote Controller To use the remote controller thermistor control during group control, select the Second code No. 02 in First code No. 6. : Factory setting Mode First Code Second Code Contents Remote controller thermistor control is not permitted 01...
  • Page 146 Field Setting from Remote Controller SiUS331708EC Human detection State of absence (˚F) (˚C) 87.8 84.2 82.4 80.6 Cooling (at 28˚C (82.4˚F)) 78.8 69.8 Heating (at 20˚C (68˚F)) 66.2 64.4 62.2 30 (60)∗ 60 (120)∗ Elapsed time of absence (min.) ∗ The values in parentheses represent the time when Second code No.
  • Page 147 SiUS331708EC Field Setting from Remote Controller There is a limitation of combination between Ton and Toff as below due to 2°C (3.6°F) hysteresis required for reliability. Second Code No. –4°C –3.5°C –3°C –2.5°C –2°C –1.5°C (–7.2°F) (–6.3°F) (–5.4°F) (–4.5°F) (–3.6°F) (–2.7°F) 0.5°C (0.9°F) 0°C (0°F)
  • Page 148 Field Setting from Remote Controller SiUS331708EC 1.5.8 Electric Heater Setting (for FXTQ-TA models) : Factory setting Contents Second Code Mode No. First Code No. Electric heater run for Heater operation defrost/oil return operation Electric heater with heat 01 Not allowed pump not allowed...
  • Page 149 SiUS331708EC Field Setting from Remote Controller 1.5.10 Setting the Rate of Human Detection (For units with an infrared presence sensor only) Set the sensitivity of the infrared presence sensor.  The infrared presence sensor can be disabled by selecting the Second code No. 04. Note(s) When the infrared presence sensor is disabled, the remote controller menu does not display some functions such as the automatic draft reduction, energy-saving operation in absence and halt in...
  • Page 150 Field Setting from Remote Controller SiUS331708EC 2. If the air passageway including duct or blow-off ports is changed after automatic adjustment, make sure to perform automatic airflow adjustment again. 1.5.12 Compensating the Temperature around People (For units with the infrared floor sensor only) Change the ratio between the suction air temperature and floor temperature used to calculate the temperature around human.

  • Page 151: External On/Off Input

    SiUS331708EC Field Setting from Remote Controller 1.5.14 Dry Mode Set Temperature (for FXZQ-TB, FXUQ-PA, FXSQ-TB, and FXMQ-TB models) : Factory setting Mode No. First Code No. Second Code No. Contents 01 Room temperature 11 (21) Same as cooling mode set temperature 1.5.15 Optional Output Switching Using this setting, "operation output signal"...

  • Page 152: Auto Restart After Power Failure

    Field Setting from Remote Controller SiUS331708EC 1.5.17 Thermostat Switching Differential value during thermostat ON/OFF control can be changed. Mode No. First Code No. Second Code No. Contents 1°C (1.8°F) 12 (22) 0.5°C (0.9°F) Factory Setting Model Second Code No. Contents FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-M, FXUQ-P, FXEQ-P, 1°C (1.8°F) FXSQ-TA, FXHQ-M, FXTQ-TA...
  • Page 153 SiUS331708EC Field Setting from Remote Controller Due to the aforementioned, when the "Auto restart after power failure” setting is ON, be careful for the following situations that may occur. 1. The air conditioner will start operation suddenly after power failure, Caution or when the main power supply is restored.

  • Page 154: Airflow Direction Setting

    Field Setting from Remote Controller SiUS331708EC FXZQ-TA, FXZQ-TB, FXZQ-M, FXEQ-P : Factory setting Mode First Code Second Contents Ceiling height Code No. 01 Standard Lower than 2.7 m (8-3/4 ft) 13 (23) High Ceiling 1 Lower than 3.0 m (10 ft) Higher Ceiling 2 Lower than 3.5 m (11-1/2 ft) FXHQ-M, FXAQ-P...
  • Page 155 SiUS331708EC Field Setting from Remote Controller 1.5.26 Setting of Static Pressure Selection (for FXDQ-M models) : Factory setting Mode No. First Code No. Second Code No. Contents Standard (FXDQ07-12M: 10 Pa (0.04 inWG), 01 FXDQ18/24M: 30 Pa (0.12 inWG)) 13 (23) High static pressure (FXDQ07-12M: 15 Pa (0.06 inWG), FXDQ18/24M: 45 Pa (0.18 inWG)) 1.5.27 External Static Pressure Settings...
  • Page 156 Field Setting from Remote Controller SiUS331708EC FXMQ-TB models : Factory setting Mode No. First Code No. Second Code No. Contents 50 Pa (0.20 inWG) 60 Pa (0.24 inWG) 70 Pa (0.28 inWG) 80 Pa (0.32 inWG) 90 Pa (0.36 inWG) 07...
  • Page 157 SiUS331708EC Field Setting from Remote Controller 1.5.30 Mold Proof Operation Setting (for FXEQ-P models) : Factory setting Mode First Code Second Code Contents — 14 (24) 02 Standard For high humidity areas () Areas with average humidity over 80%. 1.5.31 Gas Furnace Test Mode (for CXTQ-TA models) This setting is used for gas furnace test run.

  • Page 158: Room Temperature Display

    Field Setting from Remote Controller SiUS331708EC 1.5.35 Interlocked Operation between Humidifier and Drain Pump This is used to interlock the humidifier with the drain pump. When water is drained out of the unit, this setting is unnecessary. : Factory setting Mode First Code Second Code...
  • Page 159 SiUS331708EC Field Setting from Remote Controller 1.5.40 Access Permission Level Setting  For BRC1E73 only There are 2 levels as follows:  Level 2: The following buttons are selectable to be disable or enable.  Level 3: No buttons are selectable and only On/Off button is available. Button Level 2 Level 3...

  • Page 160: Gas Furnace Set Up

    Field Setting from Remote Controller SiUS331708EC Gas Furnace Set Up Set-up for gas furnace is possible only by using the DIP switches located on CXTQ-TA. Gas furnace’s DIP switch is not valid. Refer to the gas furnace’s installation manual for details of each setting menu.

  • Page 161: List Of Field Settings For Outdoor-Air Processing Unit

    SiUS331708EC Field Setting from Remote Controller Dip switch — — B — — ON OFF Heating Speed Tap — — — — List of Field Settings for Outdoor-Air Processing Unit : Factory setting First Second Code No. Mode Code Setting Contents Filter contamination 2500 hr 1250 hr...
  • Page 162 Field Setting from Remote Controller SiUS331708EC How to Select Operation Mode Whether operation by remote controller will be possible or not for turning ON/OFF, controlling temperature or setting operation mode is selected and decided by the operation mode given on the right edge of the table below.

  • Page 163: Field Settings From Outdoor Unit

    SiUS331708EC Field Settings from Outdoor Unit 2. Field Settings from Outdoor Unit Setting Mode and Monitor Mode The following 3 modes can be changed over with the button switches on the PCB and you can find the present mode by the status of the H1P indicator. H1P H3P H5P H7P H2P H4P H6P (SET)

  • Page 164: Setting Mode 1

    Field Settings from Outdoor Unit SiUS331708EC Setting Mode 1 This mode is used to set and check the following items. 1. Set items In order to make COOL/HEAT selection in a batch of outdoor unit group, change the setting. Used to select COOL or HEAT by individual outdoor COOL/HEAT selection (IND) unit (factory setting).

  • Page 165: Setting Mode 2

    SiUS331708EC Field Settings from Outdoor Unit Setting Mode 2 Setting item Description Press the MODE (BS1) button for 5 seconds and enter the setting mode Cool / heat unified Sets address for cool / heat unified operation. address Low noise / demand Address for low noise / demand operation address Used to conduct test operation without making changes to the...
  • Page 166 Field Settings from Outdoor Unit SiUS331708EC Heating comfort setting Selects comfort level of VRT heating. Heat pump would be resumed when the outdoor ambient Heat pump lockout temperature is recovered by differential above the heat pump release differential lockout temperature. Auxiliary heater Auxiliary heater is allowed to energize when the ambient maximum allowable...
  • Page 167 SiUS331708EC Field Settings from Outdoor Unit Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave Factory setting k h h h h h h Address k h h h h h k Cool / heat Binary number unified address (6 digits)
  • Page 168 Field Settings from Outdoor Unit SiUS331708EC Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave Factory setting k h h h h h h k h h h h h k –20.5°C (–5°F) k h h h h k h k h h h h k k –17.7°C (0°F)
  • Page 169 SiUS331708EC Field Settings from Outdoor Unit Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave Factory setting k h h h h h k 60 % demand k h h h h k h 30 Demand setting 1 70 % demand k h h h k h h...
  • Page 170 Field Settings from Outdoor Unit SiUS331708EC Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave Factory setting k h h h h h h 2.8°C (5°F) Auxiliary heater k h h h h h k maximum allowable 5.6°C (10°F) temperature release...

  • Page 171: Monitor Mode

    SiUS331708EC Field Settings from Outdoor Unit Monitor Mode LED display Press the MODE (BS1) button and Setting item Data display enter the monitor mode. H3P H4P l h h h h h h Various setting See the note below. l h h h h h k Cool / heat unified address l h h h h k h Low noise / demand address...
  • Page 172 Field Settings from Outdoor Unit SiUS331708EC  Data such as addresses and number of units is expressed as binary numbers; the two ways of expressing are as follows: Figure 1 The No. 1 cool / heat unified address is expressed as a binary number l h l h l l h consisting of the lower 6 digits.

  • Page 173: Setting Of Low Noise Operation And Demand Operation

    SiUS331708EC Field Settings from Outdoor Unit Setting of Low Noise Operation and Demand Operation Setting of Low Noise Operation By connecting the external contact input to the low noise input of the external control adaptor for outdoor unit (optional), you can lower operating noise by 2-3 dB. When the low noise operation is automatically carried out at night (The external control adaptor for outdoor unit is not required) While in setting mode 2, select the setting condition (i.e., Mode 1, Mode 2, or Mode 3) for...
  • Page 174 Field Settings from Outdoor Unit SiUS331708EC Setting of Demand Operation By connecting the external contact input to the demand input of the external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition.

  • Page 175: Setting Of Refrigerant Recovery Mode

    SiUS331708EC Field Settings from Outdoor Unit : ON : OFF : Blink Setting Setting i t t ng No. indication Setting Setting contents indication (Initial setting) contents contents H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P External low noise /...

  • Page 176: Setting Of Vacuuming Mode

    Field Settings from Outdoor Unit SiUS331708EC Setting of Vacuuming Mode In order to perform vacuuming operation on site, fully open the electronic expansion valves of indoor and outdoor units and turn on some solenoid valves. Operating 1. In setting mode 2 with units in stop mode, set the item No.21 (refrigerant recovery / vacuuming procedure mode) to ON.

  • Page 177: Check Operation

    SiUS331708EC Field Settings from Outdoor Unit Note(s)  The outdoor air temperature must be between 18.3°C (65°F) and 40.6°C (105°F).  The operation is not possible when a vessel is attached to the liquid piping.  The compressor rotation speed must be at or above that of charge mode. (Confirm with the LED display on the outdoor unit PCB.) ...

  • Page 178: Setting Of Auxiliary Heater Control

    Field Settings from Outdoor Unit SiUS331708EC 2.10 Setting of Auxiliary Heater Control To improve efficiency and lower install cost the auxiliary heater can be lockout based on outdoor temperature. Auxiliary heater maximum allowable temperature Auxiliary heater is allowed to energize when the outdoor air temperature is smaller than the auxiliary heater maximum allowable temperature.

  • Page 179: Setting Of Heat Pump Lockout And Emergency Heat Mode

    SiUS331708EC Field Settings from Outdoor Unit 2.11 Setting of Heat Pump Lockout and Emergency Heat Mode Heat pump is locked out when the setting below and/or external input to ABC terminal has been made. Setting item display Setting condition display C/H selection MODE TEST...
  • Page 180 Field Settings from Outdoor Unit SiUS331708EC Heat pump lockout temperature Heat pump would be locked out when the outdoor air temperature is smaller than the heat pump lockout temperature. This setting is only effective when heat pump lockout mode has been set. Setting item display Setting condition display C/H selection...

  • Page 181: Test Operation

    SiUS331708EC Test Operation 3. Test Operation Follow the following procedure to conduct the initial test operation after installation. Check Work Prior to Turning Power Supply ON Is the power supply appropriate? • Check the below items. Have you finished a ductwork to drain? •...

  • Page 182: Test Operation

    Test Operation SiUS331708EC Test Operation To start smoothly, a crankcase heater is equipped to the unit. To power up the crankcase heater in advance, be sure to turn on the power supply 6 hours before operation. Warning Be sure to inform other installers or attach the front panel well before leaving with the power supply turned on for the outdoor unit.
  • Page 183 SiUS331708EC Test Operation  For setting method, see the "Service Precautions" label attached to the front panel of the outdoor unit. (Be sure to keep a record of the setting items to the "Service Precautions" label.)  Don't touch the changeover switches (DS1-1) while setting them. Doing so may result in malfunction.
  • Page 184 Test Operation SiUS331708EC 2. For normal operation Set the master unit (the indoor unit with cooling and heating option rights) For wired remote controller  After test operation is completed, the symbol MASTER CONTROLLED blinks on all connected remote controllers. ...

  • Page 185: Gas Furnace Test Operation

    SiUS331708EC Test Operation Gas Furnace Test Operation Caution Always use the remote controller to stop the test operation. The test should be performed with the following procedure. 1. All install process, including heat pump system, has been done. 2. Test operation of heat pump system has been successfully completed. 3.

  • Page 186: Error Codes And Corresponding Measures

    Test Operation SiUS331708EC Error Codes and Corresponding Measures Please check the remote controller connected to the indoor unit for verification. Error Description Solution code High pressure switch activated (S1PH) Check the stop valve or (field) piping abnormality or the airflow on the air cooling heat exchanger. •...
  • Page 187 SiUS331708EC Test Operation Error Description Solution code Defective indoor unit connection or Check if there are any other defective indoor units mismatched models (R-410A, R-407C, RA, and verify if the indoor unit combination meets Hydrobox, etc.). requirements. Defective indoor unit connection or Check if there are any other defective indoor units mismatched models (R-410A, R-407C, RA, and verify if the indoor unit combination meets...

  • Page 188: When Turning On Power First Time

    Test Operation SiUS331708EC When Turning ON Power First Time The unit cannot be run for up to 12 minutes to automatically set the master power and address (indoor-outdoor address, etc.). Status Outdoor unit Test lamp H2P …. Blinks Can also be set during operation described above. Indoor unit If ON button is pushed during operation described above, the UH error indicator blinks.

  • Page 189: Part 6 Service Diagnosis

    SiUS331708EC Part 6 Service Diagnosis 1. Servicing Items to be Confirmed .............185 1.1 Troubleshooting..................185 1.2 Precautions for Maintenance..............185 1.3 Refrigerant Properties (R-410A)............... 187 2. Symptom-based Troubleshooting ............188 2.1 Indoor Unit Overall ................... 188 2.2 With Optional Infrared Presence/Floor Sensor......... 191 2.3 With Gas Furnace ..................
  • Page 190 SiUS331708EC 5.25 Indoor Blower Does Not Have Required Parameters to Function.... 244 5.26 Remote Sensor Abnormality ..............245 5.27 Humidity Sensor System Abnormality ............246 5.28 Infrared Presence/Floor Sensor Error ............247 5.29 Remote Controller Thermistor Abnormality ..........252 5.30 Outdoor Unit Main PCB Abnormality............253 5.31 Activation of High Pressure Switch ............
  • Page 191 SiUS331708EC 5.69 Central Control Indicator Lamp Blinking (One blink) ........ 305 5.70 Central Control Indicator Lamp Blinking (Two blinks) ......308 6. Check ......................309 6.1 High Pressure Check ................309 6.2 Low Pressure Check ................310 6.3 Superheat Operation Check..............312 6.4 Power Transistor Check ................

  • Page 192: Servicing Items To Be Confirmed

    Servicing Items to be Confirmed SiUS331708EC 1. Servicing Items to be Confirmed Troubleshooting (1) Initial verification and troubleshooting 1. Properly understand the end user's needs and issues. 2. Check the cause of errors according to the description provided by the end user. 3.
  • Page 193 SiUS331708EC Servicing Items to be Confirmed (4) Precautions for piping work and refrigerant charging: This unit uses R-410A refrigerant. Pay attention to the following conditions. 1. The charging pipe and the manifold tube use R-410A products for pressure maintenance and avoiding contamination by impurities (SUNISO oil, etc.).

  • Page 194: Refrigerant Properties (R-410A)

    Servicing Items to be Confirmed SiUS331708EC Refrigerant Properties (R-410A) MPa G psi G –0.1 –15 –50 –40 –30 –20 –10 °C –58 –40 –22 –4 °F Temperature Absolute Absolute Absolute Absolute Temperature Temperature Temperature Temperature Pressure Pressure Pressure Pressure °C °F °C °F...

  • Page 195: Symptom-Based Troubleshooting

    SiUS331708EC Symptom-based Troubleshooting 2. Symptom-based Troubleshooting Indoor Unit Overall Symptom Supposed Cause Countermeasure The system does not start operation at all. Blowout of fuse(s) Turn OFF the power supply and then replace the fuse (s). Cutout of breaker(s) • If the knob of any breaker is in its OFF position, turn ON the power supply.
  • Page 196 Symptom-based Troubleshooting SiUS331708EC Symptom Supposed Cause Countermeasure COOL/HEAT The remote controller displays This remote controller has no option Use a remote controller with option to selection is CENTRAL CONTROL. to select cooling operation. select cooling operation. disabled. The remote controller displays COOL/HEAT selection is made using Use the COOL/HEAT selection CENTRAL CONTROL, and the...
  • Page 197 SiUS331708EC Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure The system Indoor unit These are operating sounds of the Normal operation. produces sounds. Immediately after turning ON electronic expansion valve of the This sound becomes low after a the power supply, indoor unit indoor unit.

  • Page 198: With Optional Infrared Presence/Floor Sensor

    Symptom-based Troubleshooting SiUS331708EC With Optional Infrared Presence/Floor Sensor Condition Measure "Louver operation different from setting" or "No downward Refer to the flowchart below. airflow in heating operation" Individual airflow direction setting different from the actual · Check the "Louver operation different from setting" error airflow direction diagnosis.

  • Page 199: With Gas Furnace

    SiUS331708EC Symptom-based Troubleshooting With Gas Furnace Symptom Supposed Cause The gas furnace does not start operation. The gas furnace does not start operation while the compressor is during operation or under stop-control, or right after defrost IN or defrost OUT. Wait until the operation becomes stable. Operation does not switch from heat pump to gas furnace in This function is performed only with outdoor units which support spite of low room temperature.

  • Page 200: Error Code Via Remote Controller

    (2) Taking corrective action. Press the Menu/OK button to check the error code. Error code A6-01 FXFQ07TVJU Take the corrective action specific to the Applicable RXSQ24TAVJU model names model. Part 6 Service Diagnosis...

  • Page 201: Wireless Remote Controller

    SiUS331708EC Error Code via Remote Controller 3.1.2 BRC1H71W Home screen When the indoor unit is in error, the controller will display Auto Cool on the home screen. Room Information screen Press and hold on the Home screen for 5 seconds. 12:34 The unit number and error code will be displayed at the bottom of the information screen.
  • Page 202 Error Code via Remote Controller SiUS331708EC  The upper digit of the code changes as shown below. O0 A C E H F J L P U 9 8 7 6 5 4 "UP" button "DOWN" button Continuous beep : Both upper and lower digits match. (Error code is confirmed.) 2 short beeps : The upper digit matches but the lower digit does not.

  • Page 203: Error Code Indication By Outdoor Unit Pcb

    SiUS331708EC Error Code Indication by Outdoor Unit PCB 4. Error Code Indication by Outdoor Unit PCB Monitor mode Error To enter the monitor mode, press Error Description Code the MODE (BS1) button when in PCB abnormality “Setting mode 1”. Abnormal high pressure switch High pressure switch activated Abnormal low pressure switch Low pressure switch activated...
  • Page 204 Error Code Indication by Outdoor Unit PCB SiUS331708EC k: ON h: OFF l: Blink Confirmation of Error 1 Confirmation of Error 2 Confirmation of Error 3 Confirmation of Error 4 Error Code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P Display of error Display of error description Display 1 of...
  • Page 205 SiUS331708EC Error Code Indication by Outdoor Unit PCB Monitor mode Error To enter the monitor mode, press Error Description Code the MODE (BS1) button when in Inverter over-ripple protection Imbalance of inverter power supply “Setting mode 1”. voltage Defective temperature sensor of Defective thermistor of inverter fin inverter radiation fin Refrigerant shortage...
  • Page 206 Error Code Indication by Outdoor Unit PCB SiUS331708EC k: ON h: OFF l: Blink Confirmation of Error 1 Confirmation of Error 2 Confirmation of Error 3 Confirmation of Error 4 Error Code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P Display 1 of Display of error Display of error description...

  • Page 207: Troubleshooting By Error Code

    SiUS331708EC Troubleshooting by Error Code 5. Troubleshooting by Error Code Error Codes and Descriptions k: ON h: OFF l: Blink Error Operation Reference Error contents code lamp page External protection device abnormality Indoor unit control PCB abnormality Drain level control system abnormality Indoor fan motor lock, overload Indoor fan motor abnormality Blower motor not running...
  • Page 208 Troubleshooting by Error Code SiUS331708EC Error Operation Reference Error contents code lamp page Inverter PCB abnormality Inverter radiation fin temperature rise abnormality Compressor instantaneous overcurrent Compressor overcurrent Outdoor Unit Compressor startup abnormality Transmission error between microcomputers on outdoor unit main PCB Inverter circuit capacitor high voltage P4 (1) Radiation fin thermistor abnormality...

  • Page 209: Error Codes (Sub Codes)

    SiUS331708EC Troubleshooting by Error Code Error Codes (Sub Codes) If an error code like the one shown below is displayed when a wired remote controller is in use, make a detailed diagnosis. 5.2.1 Indoor Unit Troubleshooting Error code Error Description Diagnosis A0 - 01 External protection device abnormality...
  • Page 210 Troubleshooting by Error Code SiUS331708EC Troubleshooting Error code Error Description Diagnosis Climate Talk Communication system combination Refer to page 294. UH - 05 error (before initial setting for communication completes) Climate Talk Communication system combination Refer to page 295. UH - 06 error (after initial setting for communication completes) Part 6 Service Diagnosis...

  • Page 211: External Protection Device Abnormality

    SiUS331708EC Troubleshooting by Error Code External Protection Device Abnormality 5.3.1 External Protection Device Abnormality (Except FXTQ-TA and CXTQ-TA) Applicable All indoor unit models (except FXTQ-TA and CXTQ-TA) Models Error Code Method of Error Detects open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals with the remote controller set to...
  • Page 212 Troubleshooting by Error Code SiUS331708EC 5.3.2 External Protection Device Abnormality (FXTQ-TA and CXTQ-TA Only) Applicable FXTQ-TA, CXTQ-TA Models A0-01 Error Code Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals. Conditions Supposed ...

  • Page 213: Indoor Unit Control Pcb Abnormality

    SiUS331708EC Troubleshooting by Error Code Indoor Unit Control PCB Abnormality Applicable All indoor unit models Models Error Code Method of Error Check data from EEPROM. Detection Error Decision When data could not be correctly received from the EEPROM Conditions EEPROM : Type of nonvolatile memory. Maintains memory contents even when the power supply is turned OFF.

  • Page 214: Drain Level Control System Abnormality

    Troubleshooting by Error Code SiUS331708EC Drain Level Control System Abnormality Applicable FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXZQ-M, FXUQ-P, FXUQ-PA, FXEQ-P, FXDQ-M, Models FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB Error Code Method of Error By float switch OFF detection Detection Error Decision When rise of water level is not a condition and the float switch goes OFF. Conditions Supposed ...
  • Page 215 SiUS331708EC Troubleshooting by Error Code The drain pump works when the Check the drain piping for power supply is reset for the clogging or upward slope, etc. indoor unit. voltage of drain pump terminals ( 2) is in accordance to the criteria Replace the indoor unit control ( 3) (within 5 minutes of PCB (A1P).

  • Page 216: Indoor Fan Motor Lock, Overload

    Troubleshooting by Error Code SiUS331708EC Indoor Fan Motor Lock, Overload Applicable FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXSQ05-48TA, Models FXSQ05-48TB, FXMQ07-12PB, FXMQ15-24TB, FXAQ-P Error Code Method of Error Abnormal fan revolutions are detected by a signal output from the fan motor. Detection Error Decision When the fan revolutions do not increase...
  • Page 217 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply, and then wait for a period of 10 minutes. Are there any foreign Remove the foreign matter.

  • Page 218: Indoor Fan Motor Abnormality

    Troubleshooting by Error Code SiUS331708EC Indoor Fan Motor Abnormality 5.7.1 Indoor Fan Motor Abnormality (FXDQ-M, FXHQ-M Models) Applicable FXDQ-M, FXHQ-M Models Error Code Method of Error This error is detected if there is no revolution detection signal output from the fan motor. Detection Error Decision When no revolutions can be detected even at the maximum output voltage to the fan...
  • Page 219 SiUS331708EC Troubleshooting by Error Code 5.7.2 Indoor Fan Motor Abnormality (FXSQ54TA, FXSQ54TB, FXMQ15-54PB, FXMQ30-54TB Models) Applicable FXSQ54TA, FXSQ54TB, FXMQ15-54PB, FXMQ30-54TB Models Error Code Method of Error Error from the current flow on the fan PCB Error from the rotation speed of the fan motor in operation Detection Error from the position signal of the fan motor Error from the current flow on the fan PCB when the fan motor starting operation...
  • Page 220 Troubleshooting by Error Code SiUS331708EC Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power and wait for 10 minutes. There is a foreign matter around Remove the foreign matter.
  • Page 221 SiUS331708EC Troubleshooting by Error Code resistance among U, V, and W Replace the indoor fan motor (M1F). are unbalanced or short circuited. CHECK 17 Remove the signal connector from the fan motor and check the resistance. Between Vcc and GND terminals, and Replace the indoor fan motor (M1F).

  • Page 222: Blower Motor Not Running

    Troubleshooting by Error Code SiUS331708EC Blower Motor Not Running Applicable FXTQ-TA Models Error Code Outline Error is issued if the indoor unit determines that the indoor fan motor cannot rotate. Error Decision  Determining successive abnormalities Conditions Checks the rotation speed at 5-second intervals using the feedback of the fan motor. If that figure falls below 50 rpm 5 times successively, it is deemed abnormal operation.

  • Page 223: Indoor Fan Motor Status Abnormality

    SiUS331708EC Troubleshooting by Error Code Indoor Fan Motor Status Abnormality Applicable FXTQ-TA Models A6-20 Error Code Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Power Limit or Temp Limit status, it will be deemed a MOTOR LIMIT Conditions abnormal operation.

  • Page 224: Low Indoor Airflow

    Troubleshooting by Error Code SiUS331708EC 5.10 Low Indoor Airflow Applicable FXTQ-TA Models A6-21 Error Code Outline Error is issued if the indoor unit determines that the indoor fan motor rotation is insufficient, regardless of the rotation command from indoor unit. Error Decision ...

  • Page 225: Swing Flap Motor Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.11 Swing Flap Motor Abnormality Applicable FXHQ-M, FXAQ-P Models Error Code Method of Error Utilizes ON/OFF of the limit switch when the motor turns. Detection Error Decision When ON/OFF of the micro-switch for positioning cannot be reversed even though the swing flap Conditions motor is energized for a specified amount of time (about 30 seconds).
  • Page 226 Troubleshooting by Error Code SiUS331708EC The relay cable has no Replace the power supply continuity. relay cable. When the airflow direction flap-cam mechanism is disconnected Replace the defective swing from the swing motor, operation motor. (∗2) is normal when turned ON again.

  • Page 227: Power Supply Voltage Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.12 Power Supply Voltage Abnormality Applicable FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB Models Error Code Method of Error Error is detected by checking the input voltage of the fan motor. Detection Error Decision When the input voltage of fan motor is 150 V or less, or 386 V or more. Conditions Supposed ...

  • Page 228: Blower Motor Stops For Over/Under Voltage

    Troubleshooting by Error Code SiUS331708EC 5.13 Blower Motor Stops for Over/Under Voltage Applicable FXTQ-TA Models Error Code Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Over/Under Voltage status, it will be deemed a MOTOR VOLTS abnormal Conditions operation.

  • Page 229: Electronic Expansion Valve Coil Abnormality, Dust Clogging

    SiUS331708EC Troubleshooting by Error Code 5.14 Electronic Expansion Valve Coil Abnormality, Dust Clogging Applicable All indoor unit models Models Error Code Method of Error Check coil condition of electronic expansion valve by using microcomputer. Detection Check dust clogging condition of electronic expansion valve main body by using microcomputer. Error Decision Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.

  • Page 230: Gas Furnace Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.15 Gas Furnace Abnormality Applicable CXTQ-TA Models AA-03 Error Code Method of Error Detects the error signal from the gas furnace when any error occurs on the gas furnace. The indoor Detection unit displays AA-03 for any sort of gas furnace abnormality. Error Decision The error status differs depending on each error code of the gas furnace.

  • Page 231: Drain Level Above Limit

    SiUS331708EC Troubleshooting by Error Code 5.16 Drain Level above Limit Applicable FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXZQ-M, FXUQ-P, FXUQ-PA, FXEQ-P, FXDQ-M, Models FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB Error Code Method of Error Water leakage is detected based on float switch ON/OFF operation while the compressor is not in Detection operation.

  • Page 232: Self-Cleaning Decoration Panel Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.17 Self-Cleaning Decoration Panel Abnormality Applicable FXFQ-T (when self-cleaning decoration panel BYCQ125BGW1 is installed) Models Error Code Method of Error Error is detected by abnormal signal from the self-cleaning decoration panel. Detection Error Decision Any of the following conditions is met while the unit is in operation. Conditions ...
  • Page 233 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the transmission between self-cleaning decoration panel Go to Diagnosis Flowchart-1. and indoor unit (Transmission error between normal? self-cleaning decoration panel and indoor unit)
  • Page 234 Troubleshooting by Error Code SiUS331708EC Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-1 AH-03 Transmission error between self-cleaning decoration panel and indoor unit Is the connector ( 1) on the indoor unit control Properly connect the PCB properly connected? connector.
  • Page 235 SiUS331708EC Troubleshooting by Error Code Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-2 AH-04 Dust detection sensor error Is the connector X12A on the self-cleaning decoration panel PCB Properly connect the properly connected? connector.
  • Page 236 Troubleshooting by Error Code SiUS331708EC Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-3 AH-05 Dust collection sign Is the inside of dust collection port clogged Clean the dust from the inside by dust? of dust collection port.
  • Page 237 SiUS331708EC Troubleshooting by Error Code Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-4 AH-06 Air filter rotation error Is the filter Properly attached the filter. properly attached? Is there any foreign matter in the filter Remove the foreign matter.
  • Page 238 Troubleshooting by Error Code SiUS331708EC From the previous page Start operation with remote controller. Error AH recurs, Normal. or the self-cleaning decoration panel lamp (red) blinks? The error could be caused by other causes. Refer to other diagnosis flowcharts in the following order: AH-05→03→04→07→08→09.
  • Page 239 SiUS331708EC Troubleshooting by Error Code Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-5 AH-07 Damper rotation error Is the damper Properly attached the damper. properly attached? Is there any foreign matter in the damper Remove the foreign matter.
  • Page 240 Troubleshooting by Error Code SiUS331708EC From the previous page Start operation with remote controller. Error AH recurs, Normal. or the self-cleaning decoration panel lamp (red) blinks? The error could be caused by other causes. Refer to other diagnosis flowcharts in the following order: AH-05→03→04→06→08→09.
  • Page 241 SiUS331708EC Troubleshooting by Error Code Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-6 AH-08 Filter auto clean operation error Is there any external factor other than the Remove the external factor.
  • Page 242 Troubleshooting by Error Code SiUS331708EC Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-7 AH-09 Filter auto clean operation start disabled error Has any air conditioning operation been Stop the air conditioning running continuously for operation and perform filter...

  • Page 243: Capacity Determination Device Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.18 Capacity Determination Device Abnormality Applicable All indoor unit models Models Error Code Method of Error Capacity is determined according to resistance of the capacity setting adaptor and the memory Detection inside the IC memory on the indoor unit control PCB, and whether the value is normal or abnormal is determined.

  • Page 244: Transmission Abnormality Between Indoor Unit Control Pcb And Fan Pcb

    Troubleshooting by Error Code SiUS331708EC 5.19 Transmission Abnormality between Indoor Unit Control PCB and Fan PCB Applicable FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB Models Error Code Method of Error Transmission conditions between the indoor unit control PCB (A1P) and fan PCB (A2P) are Detection checked via microcomputer.
  • Page 245 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the connector between indoor unit control PCB Connect the connector (A1P) and fan PCB accurately.

  • Page 246: Blower Motor Communication Error

    Troubleshooting by Error Code SiUS331708EC 5.20 Blower Motor Communication Error Applicable FXTQ-TA Models C1-07 Error Code Outline Error is issued if transmission abnormalities occur between indoor unit and fan motor. Error Decision If the response message from the fan motor is an abnormal message, and determined as such by Conditions the indoor unit, the indoor unit will execute a retry.

  • Page 247: Climate Talk Communication Error

    SiUS331708EC Troubleshooting by Error Code 5.21 Climate Talk Communication Error Applicable CXTQ-TA Models C1-08 Error Code Method of Error Monitors the communication with the gas furnace connected to the Climate Talk Communication Detection terminal. Error Reset The error decision is made when the communication with the gas furnace is lost after once the Conditions initial setting for communication with the gas furnace completes.

  • Page 248: Thermistor Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.22 Thermistor Abnormality Applicable C4, C5: All indoor units Models C9: except FXTQ-TA and CXTQ-TA models CA: FXMQ-PB models only C4, C5, C9, CA Error Code Method of Error The error is determined by the temperature detected by the thermistor. Detection Error Decision The thermistor becomes disconnected or shorted while the unit is running.

  • Page 249: Combination Error Between Indoor Unit Control Pcb And Fan Pcb

    SiUS331708EC Troubleshooting by Error Code 5.23 Combination Error between Indoor Unit Control PCB and Fan PCB Applicable FXSQ-TA, FXSQ-TB, FXMQ-PB, FXMQ-TB Models Error Code Method of Error Check the condition of transmission with fan PCB (A2P) using indoor unit control PCB (A1P). Detection Error Decision When the communication data of fan PCB (A2P) is determined as incorrect.

  • Page 250: Blower Motor Hp Mismatch

    Troubleshooting by Error Code SiUS331708EC 5.24 Blower Motor HP Mismatch Applicable FXTQ-TA Models C6-01 Error Code Outline Error is issued if the manufacturer ID and output of the connected fan motor do not match those recognized by the indoor unit. Error Decision Gathers information on the manufacturer ID and output of the fan motor when initializing the fan Conditions...

  • Page 251: Indoor Blower Does Not Have Required Parameters To Function

    SiUS331708EC Troubleshooting by Error Code 5.25 Indoor Blower Does Not Have Required Parameters to Function Applicable FXTQ-TA Models C6-02 Error Code Outline Indoor units perform required settings for control on the fan motor, but if the minimum required settings are not made then information indicating as such will be included among the periodic control status information.

  • Page 252: Remote Sensor Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.26 Remote Sensor Abnormality Applicable FXTQ-TA, CXTQ-TA Models Error Code Method of Error The error is detected by remote sensor temperature. Detection Error Decision When the remote sensor becomes disconnected or shorted while the unit is running. Conditions Supposed ...

  • Page 253: Humidity Sensor System Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.27 Humidity Sensor System Abnormality Applicable FXFQ-T, FXFQ-P Models Error Code Method of Error Even if an error occurs, operation still continues. Detection Error is detected according to the moisture (output voltage) detected by the moisture sensor. Error Decision When the moisture sensor is disconnected or short circuited Conditions...

  • Page 254: Infrared Presence/Floor Sensor Error

    Troubleshooting by Error Code SiUS331708EC 5.28 Infrared Presence/Floor Sensor Error Applicable FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA Models Error Code Method of Error The contents of a failure vary with the detailed error code. Check the code and proceed with the Detection flowchart.

  • Page 255: Diagnosis Procedure

    SiUS331708EC Troubleshooting by Error Code Diagnosis procedure 1 Infrared presence sensor error (Error code CE-01) Is the connection of the connector on infrared presence Connect the connector correctly. sensor PCB and the connector ( 1) normal? Is the connection of the Connect the connector correctly.
  • Page 256 Troubleshooting by Error Code SiUS331708EC Diagnosis procedure 2 Infrared floor sensor error (Error code CE-02) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB and the connector ( 1) normal? Is the connection of the Connect the connector correctly.
  • Page 257 SiUS331708EC Troubleshooting by Error Code Diagnosis procedure 3 Infrared floor sensor error (Error code CE-03) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB and the connector (1) normal? Is the connection of the Connect the connector correctly.
  • Page 258 Troubleshooting by Error Code SiUS331708EC Diagnosis procedure 4 Infrared floor sensor error (Error code CE-04) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB and the connector ( 1) normal? Is the connection of the Connect the connector correctly.

  • Page 259: Remote Controller Thermistor Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.29 Remote Controller Thermistor Abnormality Applicable All indoor unit models Models Error Code Method of Error Error detection is carried out by the temperature detected by the remote controller thermistor. Detection Error Decision The remote controller thermistor becomes disconnected or shorted while the unit is running. ...

  • Page 260: Outdoor Unit Main Pcb Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.30 Outdoor Unit Main PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error Abnormality is detected under the communication conditions in the hardware section between the Detection indoor unit and outdoor unit. Error Decision When the communication conditions in the hardware section between the indoor unit and the Conditions...

  • Page 261: Activation Of High Pressure Switch

    SiUS331708EC Troubleshooting by Error Code 5.31 Activation of High Pressure Switch Applicable All outdoor unit models Models Error Code Method of Error Detect continuity across the high pressure switch in the protection device circuit. Detection Error Decision When part of the protection device circuit opens. Conditions (Reference) Operating pressure of the high pressure switch: ...
  • Page 262 Troubleshooting by Error Code SiUS331708EC CHECK 12 Compare the voltage measurement of the connector of the pressure sensor ( 1) with the Replace the high pressure sensor measurement of the pressure (S1NPH). gauge. Are the characteristics of the ( 1) Use the table on CHECK 12 to high pressure convert the voltage measurement into sensor...

  • Page 263: Activation Of Low Pressure Sensor

    SiUS331708EC Troubleshooting by Error Code 5.32 Activation of Low Pressure Sensor Applicable All outdoor unit models Models Error Code Method of Error Make judgment of pressure detected by the low pressure sensor with the outdoor unit main PCB. Detection Error Decision When low pressure caused a drop while the compressor is in operation: Conditions ...

  • Page 264: Compressor Motor Lock

    Troubleshooting by Error Code SiUS331708EC 5.33 Compressor Motor Lock Applicable All outdoor unit models Models Error Code Method of Error PCB takes the position signal from UVW line connected between the inverter and compressor, and Detection the error is detected when any abnormality is observed in the phase-current waveform. Error Decision This error will be output when the inverter compressor motor does not start up even in forced Conditions...
  • Page 265 SiUS331708EC Troubleshooting by Error Code insulation resistance is Replace the compressor. low (i.e., not more than 100 k:.) Power OFF Check the compressor motor coil for any broken wire. Some phase has a broken wire. Restart the compressor, and then End of work check whether or not Defective pressure...

  • Page 266: Outdoor Fan Motor Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.34 Outdoor Fan Motor Abnormality Applicable All outdoor unit models Models Error Code Method of Error The fan motor circuit error is detected based on the rotation frequency detected by Hall IC during Detection the fan motor operation. Error Decision In the condition of fan motor rotation, the number of rotation is below the fixed number for more Conditions...
  • Page 267 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the voltage between L1 and N of power terminal board Calibrate the power voltage. X1M within the power If L1 and N phases are supply voltage...

  • Page 268: Electronic Expansion Valve Coil Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.35 Electronic Expansion Valve Coil Abnormality Applicable All outdoor unit models Models Error Code Method of Error Check continuity of electronic expansion valve coil. Detection Error Decision No current is detected in the common (COM [+]) when power supply is ON. Conditions Supposed ...

  • Page 269: Discharge Pipe Temperature Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.36 Discharge Pipe Temperature Abnormality Applicable All outdoor unit models Models Error Code Method of Error Abnormality is detected according to the temperature detected by the discharge pipe thermistor. Detection Error Decision The discharge pipe temperature rises to an abnormally high level. Conditions The discharge pipe temperature rises suddenly.

  • Page 270: Thermistor Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.37 Thermistor Abnormality Applicable All outdoor unit models Models H9, J3, J5, J6, J7, J9 Error Code Method of Error Error is detected from the temperature detected by the thermistor (1). Detection Error Decision The thermistor has short circuit or open circuit. Conditions Supposed ...

  • Page 271: High Pressure Sensor Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.38 High Pressure Sensor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Error is detected from the pressure detected by the high pressure sensor. Detection Error Decision The high pressure sensor is short circuit or open circuit. Conditions Pressure range: 0-4.3 MPa (0-624 psi) Supposed...

  • Page 272: Low Pressure Sensor Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.39 Low Pressure Sensor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Error is detected from pressure detected by low pressure sensor. Detection Error Decision The low pressure sensor is short circuit or open circuit. Conditions Pressure range: 0-1.7 MPa (0-247 psi) Supposed...

  • Page 273: Inverter Pcb Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.40 Inverter PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error  Error is detected based on the current value during waveform output before starting Detection compressor.  Error is detected based on the value from current sensor during synchronous operation when starting the unit.

  • Page 274: Radiation Fin Temperature Rise Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.41 Radiation Fin Temperature Rise Abnormality Applicable All outdoor unit models Models Error Code Method of Error The radiation fin temperature is detected by the radiation fin thermistor. Detection Error Decision The radiation fin temperature exceeds a certain temperature. Conditions Supposed ...

  • Page 275: Compressor Instantaneous Overcurrent

    SiUS331708EC Troubleshooting by Error Code 5.42 Compressor Instantaneous Overcurrent Applicable All outdoor unit models Models Error Code Method of Error Error is detected from current flowing in the power transistor. Detection Error Decision An excessive current flows in the power transistor. Conditions Supposed ...

  • Page 276: Compressor Overcurrent

    Troubleshooting by Error Code SiUS331708EC 5.43 Compressor Overcurrent Applicable All outdoor unit models Models Error Code Method of Error Error is detected by current flowing in the power transistor. Detection Error Decision Overload in the compressor is detected. Conditions Supposed ...

  • Page 277: Compressor Startup Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.44 Compressor Startup Abnormality Applicable All outdoor unit models Models Error Code Method of Error Error is detected by the power transistor current Detection Error Decision Compressor overload during activation Conditions Supposed  Defective compressor Causes ...

  • Page 278: Transmission Error Between Microcomputers On Outdoor Unit Main Pcb

    Troubleshooting by Error Code SiUS331708EC 5.45 Transmission Error between Microcomputers on Outdoor Unit Main PCB Applicable All outdoor unit models Models Error Code Method of Error Transmission conditions between microcomputers on the outdoor main PCB are tested via Detection microcomputer. Error Decision No normal transmission after a certain period of time Conditions...

  • Page 279: Inverter Circuit Capacitor High Voltage

    SiUS331708EC Troubleshooting by Error Code 5.46 Inverter Circuit Capacitor High Voltage Applicable All outdoor unit models Models Error Code Method of Error The voltage waveform of the main circuit capacitor of the inverter is used to check for errors. Detection Error Decision The above-mentioned voltage waveform looks like the waveform of the power supply with a Conditions...

  • Page 280: Radiation Fin Thermistor Abnormality

    Troubleshooting by Error Code SiUS331708EC 5.47 Radiation Fin Thermistor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Resistance of the following thermistor is detected when the compressor is not operating. Detection (1) Radiation fin thermistor (2) PCB circuit thermistor Error Decision When the resistance value of thermistor becomes a value equivalent to open circuited or short Conditions...

  • Page 281: Refrigerant Shortage

    SiUS331708EC Troubleshooting by Error Code 5.48 Refrigerant Shortage Applicable All outdoor unit models Models Error Code Method of Error Refrigerant shortage check is conducted based on the discharge pipe thermistor temperature and Detection the low-pressure saturated temperature. Error Decision Microcomputer is used to determine and check for system refrigerant shortage. The unit can keep operating but there is an unconfirmed error.
  • Page 282 Troubleshooting by Error Code SiUS331708EC Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the low pressure less or equal to 0.25 MPa Short of refrigerant, closed stop Is it cooling? (36.3 psi)? valve, or blocked cooling...

  • Page 283: Power Supply Insufficient Or Instantaneous Abnormality

    SiUS331708EC Troubleshooting by Error Code 5.49 Power Supply Insufficient or Instantaneous Abnormality Applicable All outdoor unit models Models Error Code Method of Error The main circuit capacitor voltage of the inverter and the power supply voltage is checked. Detection Error Decision The main circuit capacitor of the tested inverter has abnormal voltage or the power supply voltage Conditions is abnormal.
  • Page 284 Troubleshooting by Error Code SiUS331708EC Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the power supply voltage between Calibrate the power voltage. L1 and L2 within 208 V –10% If L2 and Phase N are disconnected, to 230 V +10%? replace the distribution box.

  • Page 285: Check Operation Not Executed

    SiUS331708EC Troubleshooting by Error Code 5.50 Check Operation Not Executed Applicable All outdoor unit models Models Error Code Method of Error Determined based on whether check operation is executed or not Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions Supposed Check operation not executed...

  • Page 286: Transmission Error Between Indoor Units And Outdoor Units

    Troubleshooting by Error Code SiUS331708EC 5.51 Transmission Error between Indoor Units and Outdoor Units Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error Microcomputer checks if transmission between indoor and outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
  • Page 287 SiUS331708EC Troubleshooting by Error Code Outdoor unit PCB Replace the outdoor main microcomputer monitor PCB (A1P). (HAP) blinks. Operation ready lamp (H2P) is blinking. Lamp does not go Press and hold the RESET off for 12 minutes or (BS5) button on the outdoor more.

  • Page 288: Transmission Error Between Remote Controller And Indoor Unit

    Troubleshooting by Error Code SiUS331708EC 5.52 Transmission Error between Remote Controller and Indoor Unit Applicable All indoor unit models Models Error Code Method of Error Microcomputer checks if transmission between indoor unit and remote controller is normal. Detection Error Decision Transmission is not carried out normally for a certain amount of time.

  • Page 289: Transmission Error Between Main And Sub Remote Controllers

    SiUS331708EC Troubleshooting by Error Code 5.53 Transmission Error between Main and Sub Remote Controllers Applicable All indoor unit models Models Error Code Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub remote controller) is normal.

  • Page 290: Transmission Error Between Indoor Units And Outdoor Units In The Same System

    Troubleshooting by Error Code SiUS331708EC 5.54 Transmission Error between Indoor Units and Outdoor Units in the Same System Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error Error signal for the other indoor units is detected within the system by outdoor unit PCB. Detection Error Decision The error decision is made on any other indoor unit within the system concerned.

  • Page 291: Improper Combination Of Indoor And Outdoor Units, Indoor Units And Remote Controller

    SiUS331708EC Troubleshooting by Error Code 5.55 Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error A difference occurs in data by the type of refrigerant between indoor and outdoor units. Detection The number of indoor units is out of the allowable range.
  • Page 292 Troubleshooting by Error Code SiUS331708EC Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the outdoor unit PCB Check the model name of the replaced by the backup PCB? outdoor unit PCB and then replace the old one.

  • Page 293: Incorrect Gas Furnace Connecting Number

    SiUS331708EC Troubleshooting by Error Code 5.56 Incorrect Gas Furnace Connecting Number Applicable CXTQ-TA Models Error Code Outline Two or more "CXTQ-TA + gas furnace" and other indoor units other than CXTQ-TA are connected. Error Decision Check that two or more "CXTQ-TA + gas furnace" and other indoor units other than CXTQ-TA are Conditions not connected.

  • Page 294: Incorrect Electric Heater Capacity Setting

    Troubleshooting by Error Code SiUS331708EC 5.57 Incorrect Electric Heater Capacity Setting Applicable FXTQ-TA Models UA-17 Error Code Outline After attaching optional electric heater, if the electric heater capacity setting (11 (21)-5) is made mistakenly for heaters not featured in the lineup, heating via unintended levels of airflow will be prevented.

  • Page 295: Address Duplication Of Centralized Controller

    SiUS331708EC Troubleshooting by Error Code 5.58 Address Duplication of Centralized Controller Applicable All indoor unit models Models Centralized controller Error Code Method of Error The principal indoor unit detects the same address as that of its own on any other indoor unit. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected.

  • Page 296: Transmission Error Between Centralized Controller And Indoor Unit

    Troubleshooting by Error Code SiUS331708EC 5.59 Transmission Error between Centralized Controller and Indoor Unit Applicable All indoor unit models Models Centralized controller Schedule timer intelligent Touch Controller Error Code Method of Error Microcomputer checks if transmission between indoor unit and centralized controller is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
  • Page 297 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the indoor unit for which UE is displayed. Is the transmission error UE caused on all Go to the next page.
  • Page 298 Troubleshooting by Error Code SiUS331708EC Check the transmission wiring between centralized controller for Correct the wiring. any broken wire. CHECK 15 Check the transmission wiring between main centralized Correct the wiring. controller for any broken wire. CHECK 15 Has the main centralized controller setting connector Correct the connection of the...

  • Page 299: System Not Set Yet

    SiUS331708EC Troubleshooting by Error Code 5.60 System Not Set Yet Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to that Detection of indoor units that have made changes in temperature.

  • Page 300: System Abnormality, Refrigerant System Address Undefined

    Troubleshooting by Error Code SiUS331708EC 5.61 System Abnormality, Refrigerant System Address Undefined Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error System detects an indoor unit whose address is not defined by automatic address function. Automatic address refers to the automatic designated address of indoor unit and outdoor unit Detection when connected to the power after installation or wiring replacement (with the RESET (BS5) button...

  • Page 301: Climate Talk Communication System Combination Error (Before Initial Setting For Communication Completes)

    SiUS331708EC Troubleshooting by Error Code 5.62 Climate Talk Communication System Combination Error (Before Initial Setting for Communication Completes) Applicable CXTQ-TA Models UH-05 Error Code Method of Error Detects the type of the devices constituted in Climate Talk Communication. Detection Error Decision The error decision is made when any of the following conditions is established before elapsing 4 Conditions minutes after the power is turned ON.

  • Page 302: Climate Talk Communication System Combination Error (After Initial Setting For Communication Completes)

    Troubleshooting by Error Code SiUS331708EC 5.63 Climate Talk Communication System Combination Error (After Initial Setting for Communication Completes) Applicable CXTQ-TA Models UH-06 Error Code Method of Error Detects the type of the devices constituted in Climate Talk Communication. Detection Error Decision The error decision is made when any of the following conditions is established once the initial Conditions setting for communication with the gas furnace completes and after elapsing 4 minutes after the...

  • Page 303: Defective Pcb

    SiUS331708EC Troubleshooting by Error Code 5.64 Defective PCB Applicable Centralized controller Models intelligent Touch Controller Schedule timer Error Code Method of Error DIII-NET polarity circuit defective conditions are used to detect the error. Detection Error Decision The test detects both positive polarity and negative polarity. Conditions Supposed ...

  • Page 304: Transmission Error (Between Centralized Controllers)

    Troubleshooting by Error Code SiUS331708EC 5.65 Transmission Error (between Centralized Controllers) Applicable Centralized controller Models intelligent Touch Controller Schedule timer Error Code Method of Error DIII-NET communication data is used to detect the error. (Automatic reset) Detection Error Decision When the sub centralized controller is activated, there is no main centralized controller. Conditions The previously connected centralized controller is not responding.
  • Page 305 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the centralized controller No. changed? Reset the power supply of (Number of centralized all the centralized controllers removed controllers.

  • Page 306: Poor Centralized Controller Combination

    Troubleshooting by Error Code SiUS331708EC 5.66 Poor Centralized Controller Combination Applicable Centralized controller Models intelligent Touch Controller Schedule timer Error Code Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision There are other centralized controllers but the schedule timer is set for individual use. Conditions There are multiple main centralized controllers.
  • Page 307 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. The remote control adaptor (KRP2A series) Not available for combined use with is connected. remote control adaptor. Dismount the remote control adaptor, and then reset the power supply of all the centralized controllers.

  • Page 308: Address Duplication, Poor Setting

    Troubleshooting by Error Code SiUS331708EC 5.67 Address Duplication, Poor Setting Applicable Centralized controller Models intelligent Touch Controller Schedule timer Error Code Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision Multiple centralized controllers or intelligent touch controllers are connected, and the controllers are Conditions both set as main centralized controllers or sub centralized controllers.
  • Page 309 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is this Is the the first test operation master/slave setting result using the intelligent of the centralized controller Touch Controller? correct? Master/slave...

  • Page 310: Operation Lamp Blinking

    Troubleshooting by Error Code SiUS331708EC 5.68 Operation Lamp Blinking Applicable ON/OFF controller Models Indoor unit – Error Code Method of Error DIII-NET communication data is used to detect the error. Detection – Error Decision Conditions Supposed  Defective transmission between the centralized controller and an indoor unit Causes ...
  • Page 311 SiUS331708EC Troubleshooting by Error Code Does all the indoor the indoor unit units experiencing on which the error occurred Correct the setting of set the group No.? transmission the group No. failure? ON/OFF controller Is the main centralized controller connection Correct the wiring.

  • Page 312: Central Control Indicator Lamp Blinking (One Blink)

    Troubleshooting by Error Code SiUS331708EC 5.69 Central Control Indicator Lamp Blinking (One blink) Applicable ON/OFF controller Models Centralized controller Schedule timer – Error Code Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision  The previously connected centralized controller is not responding. Conditions ...
  • Page 313 SiUS331708EC Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Are any connected centralized Concurrently reset the controllers removed or the address changed? power supply of all the centralized controllers.
  • Page 314 Troubleshooting by Error Code SiUS331708EC Is the ON/OFF Do two or controller control range more ON/OFF controllers Modify the setting of the setting switch set connect? ON/OFF controller control duplicately? range setting switch. Reset the power supply of the ON/OFF controller. Does the remote control adaptor Not available for combined use with...

  • Page 315: Central Control Indicator Lamp Blinking (Two Blinks)

    SiUS331708EC Troubleshooting by Error Code 5.70 Central Control Indicator Lamp Blinking (Two blinks) Applicable ON/OFF controller Models – Error Code Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision The indoor unit has no centralized control address set Conditions No indoor unit within the control range Supposed...

  • Page 316: Check

    Check SiUS331708EC 6. Check High Pressure Check CHECK 1 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Stop valve closed Check to be sure the stop valve is open. Local High pipe Bent or crashed pipe pressure Conduct visual checks for pipe conditions.

  • Page 317: Low Pressure Check

    SiUS331708EC Check Low Pressure Check CHECK 2 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points [In cooling] Defective low pressure Is the pressure value checked with the Service Checker (1.) Defective sensor corresponding to the measurement value of the pressure sensor? compressor Defective outdoor unit Defective...
  • Page 318 Check SiUS331708EC Reference CHECK 7 Refer to page 316. Reference CHECK 8 Refer to page 317. Part 6 Service Diagnosis...

  • Page 319: Superheat Operation Check

    SiUS331708EC Check Superheat Operation Check CHECK 3 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Hot gas circuit clogging Defective hot Defective solenoid gas bypass ←Are the coil resistance and insulation normal? valve coil control Defective solenoid valve body (*1)
  • Page 320 Check SiUS331708EC Reference CHECK 7 Refer to page 316. Reference CHECK 8 Refer to page 317. Part 6 Service Diagnosis...

  • Page 321: Power Transistor Check

    SiUS331708EC Check Power Transistor Check CHECK 4 Perform the following procedures prior to check. (1) Power OFF. (2) Remove all the wiring connected to the PCB where power transistors are mounted on.  Preparing a multimeter in the analog system is [Preparation] ·...

  • Page 322: Refrigerant Overcharge Check

    Check SiUS331708EC Refrigerant Overcharge Check CHECK 6 In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgment, refer to the information below. Diagnosis of refrigerant overcharge 1.

  • Page 323: Refrigerant Shortage Check

    SiUS331708EC Check Refrigerant Shortage Check CHECK 7 In case of VRV Systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgement, refer to the information below. Diagnosis of shortage of refrigerant 1.

  • Page 324: Vacuuming And Dehydration Procedure

    Check SiUS331708EC Vacuuming and Dehydration Procedure CHECK 8 Conduct vacuuming and dehydration in the piping system following the procedure for Normal vacuuming and dehydration described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for Special vacuuming and dehydration described below.

  • Page 325: List Of Inverter-Related Error Codes

    SiUS331708EC Check List of Inverter-Related Error Codes CHECK 9 Code Name Condition for determining error Major cause Instantaneous overcurrent of • Inverter output current exceeds 59.1 A even • Liquid sealing compressor instantaneously. • Defective compressor • Defective inverter PCB Overcurrent of compressor •...

  • Page 326: Concept Of Inverter-Related Error Codes

    Check SiUS331708EC Concept of Inverter-Related Error Codes CHECK 10 Transmission error When transmissions between the microcomputers on the main PCB are not normal Instantaneous overcurrent of compressor (When inverter output current exceeds 59.1 A even instantaneously) Overcurrent of compressor (1) A current of 33.5 A or more continues for a period of consecutive 5 seconds.

  • Page 327: Thermistor Check

    SiUS331708EC Check 6.10 Thermistor Check CHECK 11 Thermistor type of indoor units Indoor heat exchanger Indoor heat exchanger Suction air thermistor Discharge air thermistor (liquid) thermistor (gas) thermistor Model FXFQ-T Type C — Type J FXFQ-P Type D — FXZQ-TA —...
  • Page 328 Check SiUS331708EC Thermistor temperature Resistance (k) (°C) (°F) Type A Type B Type C Type D Type E –30 –22 363.8 — — 336.7 357.9 –25 –13 266.8 — — 253.1 263.5 –20 –4 197.8 — — 191.2 196.1 –15 148.2 —...
  • Page 329 SiUS331708EC Check Thermistor temperature Resistance (k) (°C) (°F) Type G Type J Type K –30 –22 4759 352.1 350.6 –25 –13 3454 261.2 257.4 –20 –4 2534 195.4 191.0 –15 1877 147.3 143.2 –10 1404 111.8 108.4 –5 1059 85.49 82.83 806.5 65.80...

  • Page 330: Pressure Sensor Check

    Check SiUS331708EC 6.11 Pressure Sensor Check CHECK 12 4.15 4.15 Detected Pressure (MPa) = × V – × 0.5 (psi) (kg/cm (MPa) (MPa) = × V – × 0.5 51.0 1 MPa = 145 psi : High pressure (MPa) 45.9 : Low pressure (MPa) High Pressure (P : Output Voltage (High Side) (VDC)

  • Page 331: Master Unit Centralized Connector Setting Table

    SiUS331708EC Check 6.12 Master Unit Centralized Connector Setting Table CHECK 13 The master unit centralized setting connector (CN1/X1A) is mounted at the factory.  To independently use a single unit of the intelligent Touch Controller or a single unit of the central remote controller, do not dismount the master unit centralized setting connector (i.e., use the connector with the factory setting unchanged).

  • Page 332: Master-Slave Unit Setting Table

    Check SiUS331708EC 6.13 Master-Slave Unit Setting Table CHECK 14 Combination of intelligent Touch Controller and Central Remote Controller Master Slave  Pattern Master/ Master/ Master/ Master/ 1-00~4-15 5-00~8-15 1-00~4-15 5-00~8-15 Slave Slave Slave Slave Master Master Slave Slave Master — —...

  • Page 333: Fan Motor Connector Check (Power Supply Cable)

    SiUS331708EC Check 6.15 Fan Motor Connector Check (Power Supply Cable) CHECK 16 Check the fan motor connector according to the following procedure. Indoor Unit FXDQ-M, FXHQ-M 1. Turn OFF the power supply. 2. Measure the resistance between phases of U, V, W at the motor side connectors (3-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.

  • Page 334: Fan Motor Connector Check (Signal Cable)

    Check SiUS331708EC 6.16 Fan Motor Connector Check (Signal Cable) CHECK 17 Resistance measuring points and judgment criteria. FXFQ-T, FXFQ09-30P, FXZQ-TA, FXZQ-TB, FXUQ-P, FXSQ05-48TA, FXSQ05-48TB, FXMQ07-12PB, FXMQ15-24TB, FXAQ-P, Outdoor unit White Orange Brown Blue — — — — Judgment criteria Measuring points Criteria 1 ...
  • Page 335 SiUS331708EC Check FXEQ-P, FXUQ-PA — (1) — White (2) Orange (3) Brown (4) Blue (5) — (6) — — (7) — Red (8) Judgment criteria Measuring points Criteria 1  or more 2 - 5 1  or more 3 - 5 1 ...

  • Page 336: Electronic Expansion Valve Coil Check

    Check SiUS331708EC 6.17 Electronic Expansion Valve Coil Check CHECK 18 Measure the connector pin-to-pin resistance and make sure that the resistance value is within the range listed in the table below. Outdoor Unit 24/36 class X21A (Y1E) (White) 1 (Yellow) 2 (Orange) 3 (Blue) 4 —...
  • Page 337 SiUS331708EC Check Indoor Unit FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXSQ-TA, FXSQ-TB, FXMQ-TB, FXTQ-TA, CXTQ-TA Orange (1) Red (2) Yellow (3) Black (4) — (5) Gray (6) Measuring points Judgment criteria 1 - 6 2 - 6 35-55  3 - 6 4 - 6 FXZQ-M, FXMQ-PB, FXAQ-P...

  • Page 338: Fan Motor Connector Check For Fxtq-Ta

    Check SiUS331708EC 6.18 Fan Motor Connector Check for FXTQ-TA CHECK 19 CHECKING EMERSON ULTRATECH ECM MOTORS The FXTQ-TA models utilize an Emerson, 4-wire variable speed ECM blower motor. The ECM blower motor provides constant CFM. The motor is a serially communicating variable speed motor. Only four wires are required to control the motor: +Vdc, Common, Receive, and Transmit.
  • Page 339 SiUS331708EC Check The green LED on the diagnostic tool will blink indicating communications between the tool and motor. See table below for indications of tool indicators and motor actions. Replace or repair as needed. Power Green Motor Indication(s) Button Action Confirm 24VAC to UltraCheck-EZ tool.
  • Page 340 Check SiUS331708EC Electrical Checks - Low Voltage Control Circuits Turn on power to air handler or modular. Warning Line Voltage now present. Check voltage between pins on the 4-wire motor control harness between the motor and control board. Voltage on pins should read: Pins 1 to 4 = 3.3vdc Pins 1 to 2 = 3.3vdc Pins 3 to 4 = 15vdc...

  • Page 341: Motor Checks

    SiUS331708EC Check Locate the 3-circuit connector in the control/end bell. Using an ohmmeter, check the resistance between each terminal in the connector. If the resistance is 1 M or greater, the control/end bell is functioning properly. Replace the control/end bell if the resistance is lower than 1 M.

  • Page 342: Part 7 Appendix

    SiUS331708EC Part 7 Appendix 1. Wiring Diagrams..................336 1.1 Outdoor Unit ..................... 336 1.2 Indoor Unit....................342 1.3 Air Treatment Equipment ................. 361 Part 7 Appendix...

  • Page 343: Wiring Diagrams

    SiUS331708EC Wiring Diagrams 1. Wiring Diagrams Outdoor Unit RXSQ24/36TAVJU Part 7 Appendix...
  • Page 344 Wiring Diagrams SiUS331708EC RXSQ24/36TAVJUA, RXSQ24/36TBVJUA Part 7 Appendix...
  • Page 345 SiUS331708EC Wiring Diagrams RXSQ48TAVJU Part 7 Appendix...
  • Page 346 Wiring Diagrams SiUS331708EC RXSQ48TAVJUA, RXSQ48TBVJUA Part 7 Appendix...
  • Page 347 SiUS331708EC Wiring Diagrams RXSQ60TAVJU Part 7 Appendix...
  • Page 348 Wiring Diagrams SiUS331708EC RXSQ60TAVJUA, RXSQ60TBVJUA Part 7 Appendix...

  • Page 349: Indoor Unit

    SiUS331708EC Wiring Diagrams Indoor Unit FXFQ07/09/12/15/18/24/30/36/48TVJU Part 7 Appendix...
  • Page 350 Wiring Diagrams SiUS331708EC BYCQ125BGW1 (Self-Cleaning Decoration Panel for FXFQ-TVJU) Part 7 Appendix...
  • Page 351 SiUS331708EC Wiring Diagrams FXFQ09/12/18/24/30/36/48PVJU Part 7 Appendix...
  • Page 352 Wiring Diagrams SiUS331708EC FXZQ05/07/09/12/15/18TAVJU Part 7 Appendix...
  • Page 353 SiUS331708EC Wiring Diagrams FXZQ05/07/09/12/15/18TBVJU Part 7 Appendix...
  • Page 354 Wiring Diagrams SiUS331708EC FXZQ07/09/12/15/18MVJU9 Part 7 Appendix...
  • Page 355 SiUS331708EC Wiring Diagrams FXUQ18/24/30/36PVJU Part 7 Appendix...
  • Page 356 Wiring Diagrams SiUS331708EC FXUQ18/24/30/36PAVJU Part 7 Appendix...
  • Page 357 SiUS331708EC Wiring Diagrams FXEQ07/09/12/15/18/24PVJU Part 7 Appendix...
  • Page 358 Wiring Diagrams SiUS331708EC FXDQ07/09/12/18/24MVJU Part 7 Appendix...
  • Page 359 SiUS331708EC Wiring Diagrams FXSQ05/07/09/12/15/18/24/30/36/48/54TAVJU Part 7 Appendix...
  • Page 360 Wiring Diagrams SiUS331708EC FXSQ05/07/09/12/15/18/24/30/36/48/54TBVJU Part 7 Appendix...
  • Page 361 SiUS331708EC Wiring Diagrams FXMQ07/09/12/15/18/24/30/36/48/54PBVJU Part 7 Appendix...
  • Page 362 Wiring Diagrams SiUS331708EC FXMQ15/18/24/30/36/48/54TBVJU Part 7 Appendix...
  • Page 363 SiUS331708EC Wiring Diagrams FXHQ12/24/36MVJU Part 7 Appendix...
  • Page 364 Wiring Diagrams SiUS331708EC FXAQ07/09/12/18/24PVJU Part 7 Appendix...
  • Page 365 SiUS331708EC Wiring Diagrams FXLQ07/09/12/18/24MVJU, FXNQ07/09/12/18/24MVJU Part 7 Appendix...
  • Page 366 Wiring Diagrams SiUS331708EC FXTQ09/12/18/24/30/36/42/48/54/60TAVJUA(D) Part 7 Appendix...
  • Page 367 SiUS331708EC Wiring Diagrams CXTQ24/36/48/60TASBLU Part 7 Appendix...

  • Page 368: Air Treatment Equipment

    Wiring Diagrams SiUS331708EC Air Treatment Equipment 1.3.1 Outdoor-Air Processing Unit FXMQ48/72MFVJU Part 7 Appendix...
  • Page 369 SiUS331708EC Wiring Diagrams 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Part 7 Appendix...
  • Page 370 Wiring Diagrams SiUS331708EC VAM1200GVJU Part 7 Appendix...
  • Page 371 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. z Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

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