Daikin RXSQ-TA Series Service Manual
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Daikin RXSQ-TA Series Service Manual

Daikin RXSQ-TA Series Service Manual

Heat pump 60 hz
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SiUS331708EE
Service
Manual
RXSQ-TA Series
RXSQ-TB Series
Heat Pump 60 Hz

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Summary of Contents for Daikin RXSQ-TA Series

  • Page 1 SiUS331708EE Service Manual RXSQ-TA Series RXSQ-TB Series Heat Pump 60 Hz...

  • Page 2: Table Of Contents

    SiUS331708EE 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 SiUS331708EE 3.2 BRC1H71W....................75 3.3 When Wireless Remote Controller is Used Together......... 77 4. Address Setting for Wireless Remote Controller........78 5. Centralized Control Group No. Setting............80 5.1 BRC1E73 ....................80 5.2 BRC1H71W....................82 5.3 Wireless Remote Controller ............... 82 5.4 Group No. Setting Example................ 83 6.
  • Page 4 SiUS331708EE 6.10 Louver Control for Preventing Ceiling Dirt..........128 6.11 Heater Control (Except FXTQ-TA, FXTQ-TB Models) ......129 6.12 Heater Control (FXTQ-TA, FXTQ-TB Models) ......... 130 6.13 Gas Furnace Control (CXTQ-TA Models) ..........133 6.14 3-Step Thermostat Processing (FXTQ-TA, FXTQ-TB Models) ....134 6.15 2-Step Thermostat Processing (CXTQ-TA Models) .........
  • Page 5 SiUS331708EE 1.2 Precautions for Maintenance..............201 1.3 Refrigerant Properties (R-410A)............... 203 2. Symptom-based Troubleshooting ............204 2.1 Indoor Unit Overall ................... 204 2.2 With Infrared Presence/Floor Sensor ............207 2.3 With Gas Furnace ..................208 2.4 Gas Furnace Lockout Reset..............208 3.
  • Page 6 SiUS331708EE 5.37 Thermistor Abnormality ................282 5.38 High Pressure Sensor Abnormality ............283 5.39 Low Pressure Sensor Abnormality ............284 5.40 Inverter PCB Abnormality................. 285 5.41 Radiation Fin Temperature Rise Abnormality .......... 286 5.42 Compressor Instantaneous Overcurrent ..........287 5.43 Compressor Overcurrent................288 5.44 Compressor Startup Abnormality .............
  • Page 7 SiUS331708EE 6.10 Thermistor Check ..................339 6.11 Pressure Sensor Check ................342 6.12 Master Unit Centralized Connector Setting Table ........343 6.13 Master-Slave Unit Setting Table............... 344 6.14 Broken Wire Check of the Relay Wires ............ 344 6.15 Fan Motor Connector Check (Power Supply Cable) ........ 345 6.16 Fan Motor Connector Check (Signal Cable) ..........

  • Page 8: Introduction

    SiUS331708EE 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

    SiUS331708EE 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 SiUS331708EE 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

    SiUS331708EE 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 SiUS331708EE 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 SiUS331708EE 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 SiUS331708EE 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

    SiUS331708EE 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 03 / 2023 —...

  • Page 16: Part 1 General Information

    SiUS331708EE 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....................13 2.3 Air Treatment Equipment ................14 3.

  • Page 17: Model Names And Power Supply

    SiUS331708EE 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 24TA 36TA 48TA 60TA RXSQ VJUA 24TB 36TB 48TB 60TB 24TB 36TB 48TB 60TB VJUB...

  • Page 18: Air Treatment Equipment

    Model Names and Power Supply SiUS331708EE 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

    SiUS331708EE External Appearance 2. External Appearance Outdoor Unit 2, 3, 4 ton RXSQ24TAVJU RXSQ24TBVJUA RXSQ24TBVJUB RXSQ24TAVJUA RXSQ36TBVJUA RXSQ36TBVJUB RXSQ36TAVJU RXSQ48TBVJUA RXSQ48TBVJUB RXSQ36TAVJUA RXSQ48TAVJU RXSQ48TAVJUA 5 ton RXSQ60TAVJU RXSQ60TBVJUA RXSQ60TBVJUB RXSQ60TAVJUA Part 1 General Information...

  • Page 20: Indoor Unit

    External Appearance SiUS331708EE Indoor Unit Ceiling mounted cassette (Round flow with sensing) type Slim ceiling mounted duct type FXFQ-AA FXDQ-M Shown with BYCQ54EEFU Ceiling mounted cassette (Round flow with sensing) type MSP concealed ducted type FXFQ-T FXSQ-TA FXSQ-TB Shown with BYCQ125B-W1 Ceiling mounted cassette (Round flow) type Ceiling mounted duct type (Middle and high static pressure) FXFQ-P...

  • Page 21: Air Treatment Equipment

    SiUS331708EE External Appearance Concealed floor standing type Cased coil unit FXNQ-M CXTQ-TA Air handling unit FXTQ-TA FXTQ-TB — Air Treatment Equipment Outdoor-air processing unit Energy recovery ventilator (VAM series) FXMQ-MF VAM-G Part 1 General Information...

  • Page 22: Capacity Range

    Capacity Range SiUS331708EE 3. Capacity Range Connection Ratio Total capacity index of the indoor units 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...

  • Page 23: Specifications

    SiUS331708EE Specifications 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) 40,000 (11.7)
  • Page 24 Specifications SiUS331708EE 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 25 SiUS331708EE Specifications 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 26 Specifications SiUS331708EE 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 27 SiUS331708EE Specifications 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 28 Specifications SiUS331708EE 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 29 SiUS331708EE Specifications Model name RXSQ24TBVJUB RXSQ36TBVJUB 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 30 Specifications SiUS331708EE Model name RXSQ48TBVJUB RXSQ60TBVJUB 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 31: Part 2 Refrigerant Circuit

    SiUS331708EE Part 2 Refrigerant Circuit 1. Refrigerant Circuit (Piping Diagrams) ............25 1.1 Outdoor Unit ....................25 1.2 Indoor Unit....................37 1.3 Outdoor-Air Processing Unit............... 40 2. Functional Parts Layout ................41 2.1 RXSQ24/36TAVJU..................41 2.2 RXSQ24/36TAVJUA, RXSQ24/36TBVJUA ..........43 2.3 RXSQ24/36TBVJUB .................. 45 2.4 RXSQ48TAVJU..................

  • Page 32: Refrigerant Circuit (Piping Diagrams)

    Refrigerant Circuit (Piping Diagrams) SiUS331708EE 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 in multi-steps according to Te and Tc. 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 SiUS331708EE Refrigerant Circuit (Piping Diagrams) RXSQ24/36TAVJU Part 2 Refrigerant Circuit...
  • Page 34 Refrigerant Circuit (Piping Diagrams) SiUS331708EE RXSQ24/36TAVJUA, RXSQ24/36TBVJUA Part 2 Refrigerant Circuit...
  • Page 35 SiUS331708EE Refrigerant Circuit (Piping Diagrams) RXSQ24/36TBVJUB Part 2 Refrigerant Circuit...
  • Page 36 Refrigerant Circuit (Piping Diagrams) SiUS331708EE 1.1.2 48 Class No. in Electric piping Name Function symbol diagram Compressor Compressor is operated in multi-steps according to Te and Tc. 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 37 SiUS331708EE Refrigerant Circuit (Piping Diagrams) RXSQ48TAVJU Part 2 Refrigerant Circuit...
  • Page 38 Refrigerant Circuit (Piping Diagrams) SiUS331708EE RXSQ48TAVJUA, RXSQ48TBVJUA Part 2 Refrigerant Circuit...
  • Page 39 SiUS331708EE Refrigerant Circuit (Piping Diagrams) RXSQ48TBVJUB Part 2 Refrigerant Circuit...
  • Page 40 Refrigerant Circuit (Piping Diagrams) SiUS331708EE 1.1.3 60 Class No. in Electric piping Name Function symbol diagram Compressor Compressor is operated in multi-steps according to Te and Tc. 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 41 SiUS331708EE Refrigerant Circuit (Piping Diagrams) RXSQ60TAVJU Part 2 Refrigerant Circuit...
  • Page 42 Refrigerant Circuit (Piping Diagrams) SiUS331708EE RXSQ60TAVJUA, RXSQ60TBVJUA Part 2 Refrigerant Circuit...
  • Page 43 SiUS331708EE Refrigerant Circuit (Piping Diagrams) RXSQ60TBVJUB Part 2 Refrigerant Circuit...

  • Page 44: Indoor Unit

    Refrigerant Circuit (Piping Diagrams) SiUS331708EE Indoor Unit Symbol Except No. in FXMQ-PB FXTQ-TA piping Name Function FXTQ-TA FXMQ-PB FXTQ-TB diagram FXTQ-TB 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 45 SiUS331708EE Refrigerant Circuit (Piping Diagrams)  FXUQ-P, FXEQ-P, FXSQ-TA, FXAQ-P, FXLQ-M, FXNQ-M  FXZQ-M Gas piping Gas piping connection port connection port Indoor heat exchanger Indoor heat exchanger Liquid piping Liquid piping connection port connection port Filter Filter Filter Filter C: 4D034245S C: 4D040157B  FXUQ-PA  FXDQ-M...
  • Page 46 Refrigerant Circuit (Piping Diagrams) SiUS331708EE  FXTQ-TA, FXTQ-TB  CXTQ-TA Gas piping connection port Indoor heat exchanger Liquid piping connection port Filter Filter C: 4D068194 Part 2 Refrigerant Circuit...

  • Page 47: Outdoor-Air Processing Unit

    SiUS331708EE 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 48: Functional Parts Layout

    Functional Parts Layout SiUS331708EE 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 (Liquid injection) (Y3S) Fan motor...
  • Page 49 SiUS331708EE 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 50: Rxsq24/36Tavjua, Rxsq24/36Tbvjua

    Functional Parts Layout SiUS331708EE 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 (Liquid injection) (Y3S) Fan motor (M1F) Thermistor...
  • Page 51 SiUS331708EE Functional Parts Layout Side view Four way valve (Y1S) Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P589934G Part 2 Refrigerant Circuit...

  • Page 52: Rxsq24/36Tbvjub

    Functional Parts Layout SiUS331708EE RXSQ24/36TBVJUB Front view Fan motor (M1F) Compressor (M1C) Electronic expansion valve (Main) (Y1E) Crankcase heater (E1HC) Overload protector (Q1E) Precautions when installing the crankcase heater (E1HC) 1. The crankcase heater must not come into contact with Q1E fixture and Lead wire should be mounted above the Q1E fixture with about 5 mm (0.2 inch) distance.
  • Page 53 SiUS331708EE Functional Parts Layout Arrow view A Four way valve coil (Y1S) Solenoid valve coil (Liquid injection) (Y3S) Solenoid valve coil (Hot gas) (Y2S) Thermistor (Discharge pipe) (R2T) Thermistor (Liquid pipe) (R7T) High pressure sensor (S1NPH) High pressure switch (S1PH) Low pressure sensor Thermistor (Suction pipe 2) (S1NPL)

  • Page 54: Rxsq48Tavju

    Functional Parts Layout SiUS331708EE RXSQ48TAVJU Front view Four way valve (Y1S) Four way valve coil (Y1S) Low pressure sensor (S1NPL) Thermistor (Suction pipe 2) (R5T) Solenoid valve coil (Liquid injection) Thermistor (Discharge pipe) (Y3S) (R2T) High pressure switch Thermistor (Liquid pipe) (S1PH) (R7T) High pressure sensor...
  • Page 55 SiUS331708EE Functional Parts Layout Side view Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P374828X Part 2 Refrigerant Circuit...

  • Page 56: Rxsq48Tavjua, Rxsq48Tbvjua

    Functional Parts Layout SiUS331708EE RXSQ48TAVJUA, RXSQ48TBVJUA Front view Four way valve (Y1S) Four way valve coil (Y1S) Low pressure sensor (S1NPL) Thermistor (Suction pipe 2) (R5T) Solenoid valve coil (Liquid injection) Thermistor (Discharge pipe) (Y3S) (R2T) High pressure switch Thermistor (Liquid pipe) (S1PH) (R7T) High pressure sensor...
  • Page 57 SiUS331708EE Functional Parts Layout Side view Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P589935F Part 2 Refrigerant Circuit...

  • Page 58: Rxsq48Tbvjub

    Functional Parts Layout SiUS331708EE RXSQ48TBVJUB Front view Fan motor (M1F) Compressor (M1C) Electronic expansion valve (Main) (Y1E) Overload protector (Q1E) Crankcase heater (E1HC) C: 1P734117F Part 2 Refrigerant Circuit...
  • Page 59 SiUS331708EE Functional Parts Layout Arrow view A Four way valve coil (Y1S) Thermistor (Suction pipe 2) (R5T) Low pressure sensor (S1NPL) Solenoid valve coil (Liquid injection) Thermistor (Discharge pipe) (Y3S) (R2T) Thermistor (Liquid pipe) (R7T) High pressure sensor (S1NPH) High pressure switch (S1PH) Back view Thermistor (Outdoor air)

  • Page 60: Rxsq60Tavju

    Functional Parts Layout SiUS331708EE 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 61 SiUS331708EE 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: 1P441643Q Part 2 Refrigerant Circuit...

  • Page 62: Rxsq60Tavjua, Rxsq60Tbvjua

    Functional Parts Layout SiUS331708EE 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 63 SiUS331708EE 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 64: Rxsq60Tbvjub

    Functional Parts Layout SiUS331708EE RXSQ60TBVJUB Front view Fan motor 1 (M1F) Fan motor 2 (M2F) Compressor (M1C) Electronic expansion valve (Main) (Y1E) Electronic expansion valve (Subcooling) (Y3E) Overload protector (Q1E) Crankcase heater (E1HC) C: 1P735532G Part 2 Refrigerant Circuit...
  • Page 65 SiUS331708EE Functional Parts Layout Arrow view A Thermistor (Suction pipe 1) (R3T) Four way valve coil (Y1S) Thermistor (Discharge pipe) (R2T) High pressure sensor (S1NPH) High pressure switch (S1PH) Low pressure sensor (S1NPL) Side view Thermistor (Subcooling heat exchanger gas pipe) (R6T) Thermistor (Suction pipe 2) (R5T)

  • Page 66: Part 3 Remote Controller

    SiUS331708EE Part 3 Remote Controller 1. Applicable Models ..................60 2. Names and Functions ................61 2.1 BRC1E73 ....................61 2.2 BRC1H71W....................64 2.3 Wireless Remote Controller ............... 72 3. Main/Sub Setting..................73 3.1 BRC1E73 ....................73 3.2 BRC1H71W....................75 3.3 When Wireless Remote Controller is Used Together......... 77 4.

  • Page 67: Applicable Models

    SiUS331708EE Applicable Models 1. Applicable Models Wired remote controller Series Wireless remote controller Navigation Madoka FXFQ-AA 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 —...

  • Page 68: Names And Functions

    Names and Functions SiUS331708EE 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 69 SiUS331708EE 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 70: Service Check Function

    Names and Functions SiUS331708EE 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 71: Brc1H71W

    SiUS331708EE 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 72: Overview Of Screens

    Names and Functions SiUS331708EE 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 73 SiUS331708EE 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 74 Names and Functions SiUS331708EE 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 75 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 76 Names and Functions SiUS331708EE 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 77: Information Screen

    SiUS331708EE 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 78 * 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 79: Wireless Remote Controller

    SiUS331708EE 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 80: Main/Sub Setting

    Main/Sub Setting SiUS331708EE 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 81 SiUS331708EE 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 82: Brc1H71W

    Main/Sub Setting SiUS331708EE 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 83 SiUS331708EE 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 84: When Wireless Remote Controller Is Used Together

    Main/Sub Setting SiUS331708EE 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 85: Address Setting For Wireless Remote Controller

    SiUS331708EE 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 86 Address Setting for Wireless Remote Controller SiUS331708EE 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 87: Centralized Control Group No. Setting

    SiUS331708EE 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 88 Centralized Control Group No. Setting SiUS331708EE 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 89: Brc1H71W

    SiUS331708EE 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 90: Group No. Setting Example

    Centralized Control Group No. Setting SiUS331708EE 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 91: Service Settings Menu, Maintenance Menu

    SiUS331708EE 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 92: Service Settings Menu

    Service Settings Menu, Maintenance Menu SiUS331708EE 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 93: Maintenance Menu

    SiUS331708EE 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 94 Service Settings Menu, Maintenance Menu SiUS331708EE 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 95: Administrator Menu, Installer Menu

    SiUS331708EE Administrator Menu, Installer Menu 7. Administrator Menu, Installer Menu BRC1H71W Refer to page 66 for details. Part 3 Remote Controller...

  • Page 96: Part 4 Functions And Control

    SiUS331708EE Part 4 Functions and Control 1. Operation Mode ..................91 2. Basic Control.....................92 2.1 Normal Operation ..................92 2.2 Compressor PI Control................93 2.3 Electronic Expansion Valve PI Control............95 2.4 Cooling Operation Fan Control..............96 3. Special Control..................97 3.1 Startup Control ................... 97 3.2 Oil Return Control..................
  • Page 97 SiUS331708EE 6.16 Fan Control (Heater Residual) (FXTQ-TA, FXTQ-TB Models)....136 6.17 Interlocked with External Equipment (FXTQ-TA, FXTQ-TB, CXTQ-TA Models)..................... 136 Part 4 Functions and Control...

  • Page 98: Operation Mode

    Operation Mode SiUS331708EE 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 99: Basic Control

    SiUS331708EE 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 100: Compressor Pi Control

    Basic Control SiUS331708EE 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 101 SiUS331708EE Basic Control Compressor Frequency Frequency (Hz) Step 24/36 class 48/60 class 52.5 52.5 61.5 61.5 67.5 85.5 100.5 112.5 118.5 115.5 121.5 128.1 145.5 163.5 154.5 163.5 181.5 178.5 196.5 211.5 223.5 232.5 244.5 253.5 253.5 265.5 277.5 289.5 301.5 ...

  • Page 102: Electronic Expansion Valve Pi Control

    Basic Control SiUS331708EE 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 103: Cooling Operation Fan Control

    SiUS331708EE Basic Control Cooling Operation Fan Control In cooling operation with low outdoor air temperature, this control is used to provide an adequate amount of circulation air with liquid pressure secured by high pressure control from the outdoor fan. Furthermore, when outdoor temperature ≥ 20°C (68°F), the outdoor fan will run in Step 7 or higher. When outdoor temperature ≥...

  • Page 104: Special Control

    Special Control SiUS331708EE 3. Special Control Startup Control This control is used to equalize the pressure in the suction and discharge sides of the compressor prior to compressor startup, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.

  • Page 105: Startup Control In Heating

    SiUS331708EE Special Control 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 106: Oil Return Control

    Special Control SiUS331708EE 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 107 SiUS331708EE Special Control 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 108: Defrost Control

    Special Control SiUS331708EE 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 109: Pump Down Residual Control

    SiUS331708EE Special Control 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 110: Restart Standby

    Special Control SiUS331708EE 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 111: Protection Control

    SiUS331708EE Protection Control 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 112: Low Pressure Protection Control

    Protection Control SiUS331708EE 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 113: Discharge Pipe Temperature Protection Control

    SiUS331708EE Protection Control 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 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 114: Inverter Protection Control

    Protection Control SiUS331708EE 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 115 SiUS331708EE Protection Control 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 116: Other Control

    Other Control SiUS331708EE 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 117: Outline Of Control (Indoor Unit)

    SiUS331708EE Outline of Control (Indoor Unit) 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 118 Outline of Control (Indoor Unit) SiUS331708EE ∗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 119 SiUS331708EE Outline of Control (Indoor Unit) 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 120 Outline of Control (Indoor Unit) SiUS331708EE 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 121: Set Temperature And Control Target Temperature

    SiUS331708EE Outline of Control (Indoor Unit) Set Temperature and Control Target Temperature 6.2.1 Without 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 122 Outline of Control (Indoor Unit) SiUS331708EE 6.2.2 With 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 123: Remote Controller Thermistor

    SiUS331708EE Outline of Control (Indoor Unit) 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 124 Outline of Control (Indoor Unit) SiUS331708EE  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 125: Thermostat Control

    SiUS331708EE Outline of Control (Indoor Unit) Thermostat Control The thermostat ON/OFF differential value (factory setting) differs depending on the models. Differential value Model FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-M, FXUQ-P, FXEQ-P, FXSQ-TA, FXHQ-M, 1°C (1.8°F) FXTQ-TA, FXTQ-TB FXFQ-AA, FXZQ-TB, FXUQ-PA, FXDQ-M, FXSQ-TB, FXMQ-PB, FXMQ-TB, 0.5°C (0.9°F) FXAQ-P, FXLQ-M, FXNQ-M, FXMQ-MF, CXTQ-TA 6.4.1 Without Infrared Floor Sensor...
  • Page 126 Outline of Control (Indoor Unit) SiUS331708EE 6.4.2 With 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 127: Thermostat Control With Operation Mode Set To Auto

    SiUS331708EE Outline of Control (Indoor Unit) 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 128: Drain Pump Control

    Outline of Control (Indoor Unit) SiUS331708EE 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 129 SiUS331708EE Outline of Control (Indoor Unit) 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 130: Control Of Electronic Expansion Valve

    Outline of Control (Indoor Unit) SiUS331708EE 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 131: Freeze-Up Prevention

    SiUS331708EE Outline of Control (Indoor Unit) 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 132 Outline of Control (Indoor Unit) SiUS331708EE Note(s) When the indoor unit is FXFQ-AA, 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 133: List Of Swing Flap Operations

    SiUS331708EE Outline of Control (Indoor Unit) List of Swing Flap Operations Swing flaps operate as shown in table below. Flap FXZQ-TA FXFQ-AA FXZQ-TB FXFQ-T FXEQ-P FXHQ-M FXUQ-P FXFQ-P FXUQ-PA FXAQ-P Hot start from defrost Swing Horizontal Horizontal Horizontal Horizontal operation Airflow direction set Horizontal Horizontal...

  • Page 134: Hot Start Control (In Heating Operation Only)

    Outline of Control (Indoor Unit) SiUS331708EE 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 135: Louver Control For Preventing Ceiling Dirt

    SiUS331708EE Outline of Control (Indoor Unit) 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 136: Heater Control (Except Fxtq-Ta, Fxtq-Tb Models)

    Outline of Control (Indoor Unit) SiUS331708EE 6.11 Heater Control (Except FXTQ-TA, FXTQ-TB 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 137: Heater Control (Fxtq-Ta, Fxtq-Tb Models)

    SiUS331708EE Outline of Control (Indoor Unit) 6.12 Heater Control (FXTQ-TA, FXTQ-TB Models) Note(s) Optional heater kit HKS... is required. For FXTQ-TA and FXTQ-TB 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.).
  • Page 138 Outline of Control (Indoor Unit) SiUS331708EE 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 139 SiUS331708EE Outline of Control (Indoor Unit) 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 140: Gas Furnace Control (Cxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS331708EE 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 141: 3-Step Thermostat Processing (Fxtq-Ta, Fxtq-Tb Models)

    SiUS331708EE Outline of Control (Indoor Unit) 6.14 3-Step Thermostat Processing (FXTQ-TA, FXTQ-TB 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, FXTQ-TB Models) on page 130.

  • Page 142: 2-Step Thermostat Processing (Cxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS331708EE 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 143: Fan Control (Heater Residual) (Fxtq-Ta, Fxtq-Tb Models)

    SiUS331708EE Outline of Control (Indoor Unit) 6.16 Fan Control (Heater Residual) (FXTQ-TA, FXTQ-TB 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 144 Outline of Control (Indoor Unit) SiUS331708EE 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 145: Part 5 Field Settings And Test Operation

    SiUS331708EE Part 5 Field Settings and Test Operation 1. Field Setting from Remote Controller............139 1.1 BRC1E73 ....................139 1.2 BRC1H71W....................141 1.3 Wireless Remote Controller ..............144 1.4 List of Field Settings for Indoor Unit ............145 1.5 Details of Field Settings for Indoor Unit............ 150 1.6 Gas Furnace Set Up.................

  • Page 146: Field Setting From Remote Controller

    Field Setting from Remote Controller SiUS331708EE 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 147 SiUS331708EE Field Setting from Remote Controller 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 148: Brc1H71W

    Field Setting from Remote Controller SiUS331708EE 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 149 SiUS331708EE Field Setting from Remote Controller 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 150 Field Setting from Remote Controller SiUS331708EE 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 151: Wireless Remote Controller

    SiUS331708EE Field Setting from Remote Controller 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 152: List Of Field Settings For Indoor Unit

    Field Setting from Remote Controller SiUS331708EE 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 153 SiUS331708EE Field Setting from Remote Controller Mode First Second Code No. Reference Code Setting Contents Page (Note 2) Optional accessories output Refer to page on the right for details. selection External ON/OFF input Refer to page on the right for details. Thermostat differential 1°C (1.8°F) 0.5°C (0.9°F)
  • Page 154 Field Setting from Remote Controller SiUS331708EE 4. 88 or Checking the connection. Please stand by. may be displayed to indicate the remote controller is resetting when returning to the normal mode. Part 5 Field Settings and Test Operation...
  • Page 155 SiUS331708EE Field Setting from Remote Controller First Field Code Setting Modes setting Filter cleaning sign interval          Filter sign setting — — — — — — — — — Filter type — —...
  • Page 156 Field Setting from Remote Controller SiUS331708EE First Field Code Setting Modes setting Filter cleaning sign interval — —       Filter sign setting — — — — — —   Filter type — — — —...

  • Page 157: Details Of Field Settings For Indoor Unit

    SiUS331708EE 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 158 Field Setting from Remote Controller SiUS331708EE 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 159 SiUS331708EE Field Setting from Remote Controller Note(s) The control is automatically switched to the one performed only by the suction air thermistor for indoor unit when the Second code No. is 01 during group control. To use the remote controller thermistor control during group control, select the Second code No.
  • Page 160 Field Setting from Remote Controller SiUS331708EE 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 161 SiUS331708EE 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 162 Field Setting from Remote Controller SiUS331708EE 1.5.8 Electric Heater Setting (for FXTQ-TA, FXTQ-TB 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 163: Setting Procedure

    SiUS331708EE Field Setting from Remote Controller 1.5.10 Detection Rate Setting (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 164 Field Setting from Remote Controller SiUS331708EE 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. The temperature around human is calculated using the values of the suction air thermistor and the infrared floor sensor.

  • Page 165: External On/Off Input

    SiUS331708EE Field Setting from Remote Controller 1.5.15 Optional Accessories Output Selection Using this setting, operation output signal and abnormal output signal can be provided. Output signal is output between terminals X1 and X2 of adaptor for wiring, an optional accessory. : Factory setting Mode First Code...

  • Page 166: Auto Restart After Power Failure

    Field Setting from Remote Controller SiUS331708EE 1.5.18 Airflow Setting when Heating Thermostat is OFF This setting is used to set airflow when heating thermostat is OFF. If the airflow setting when thermostat is OFF is set to 03: OFF, the air in the indoor unit will be stagnant and suction air thermistor may not detect room temperature correctly, resulting in problems that thermostat will not be ON easily.
  • Page 167 SiUS331708EE Field Setting from Remote Controller 1.5.21 Airflow Setting when Cooling Thermostat is OFF This is used to set airflow to LL airflow when cooling thermostat is OFF. If the airflow setting when thermostat is OFF is set to 03: OFF, the air in the indoor unit will be stagnant and suction air thermistor may not detect room temperature correctly, resulting in problems that thermostat will not be ON easily.

  • Page 168: Airflow Direction Setting

    Field Setting from Remote Controller SiUS331708EE FXUQ-P, FXUQ-PA : Factory setting Ceiling height Mode First Code Second Setting Code No. FXUQ18/24P(A) FXUQ30/36P(A) Lower than Lower than 01 Standard 2.7 m (8-3/4 ft) 3.2 m (10-1/2 ft) Lower than Lower than 13 (23) High Ceiling 1 3.0 m (10 ft)
  • Page 169 SiUS331708EE Field Setting from Remote Controller 1.5.25 Airflow Direction Adjustment Range Make the following airflow direction setting according to the respective purpose. : Factory setting Mode First Code Second Code Contents Draft prevention (Upward) 13 (23) 02 Standard Ceiling soiling prevention (Downward) Note(s) When the model FXFQ-AA is attached with a closing member kit, set the Second Code No.
  • Page 170 Field Setting from Remote Controller SiUS331708EE FXMQ-PB models : Factory setting Mode No. First Code No. Second Code No. Contents 30 Pa (0.12 inWG) (1) (3) 02 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 171 SiUS331708EE Field Setting from Remote Controller 1.5.28 Optional Kit Setting (UV lamp + Humidifier + Economizer) (for FXTQ-TA, FXTQ-TB, CXTQ-TA models) : Factory setting Contents Second Code Economizer setting for Mode No. First Code No. UV lamp + humidifier fan Mech standby duration speed (minutes)
  • Page 172 Field Setting from Remote Controller SiUS331708EE 1.5.32 Drain Pump Operation Settings (for FXMQ-PB models) The drain pump operation can be disabled for natural drainage by changing the following field setting. : Factory setting Mode First Code Second Code Contents — 15 (25) 02...

  • Page 173: Room Temperature Display

    SiUS331708EE Field Setting from Remote Controller 1.5.37 Display of Error Codes on the Remote Controller For BRC1E73 only Error code (four digits) is displayed for limited products. Select two-digit display if four-digit display is not preferred. : Factory setting Mode First Code Second Code Contents...
  • Page 174 Field Setting from Remote Controller SiUS331708EE 1.5.41 Setback Availability For BRC1E73 only Select the operation mode in which the setback function is available. : Factory setting Mode First Code Second Code Contents 01 N/A Heat only Cool only Cool/heat 1.5.42 Setting Restricted/Permitted for Airflow Block For units with the infrared presence/floor sensor only The airflow block function cannot be enabled when closure material kit, fresh air intake kit, separately installed natural evaporation type humidifier, or branch air duct is equipped, due to the...

  • Page 175: Gas Furnace Set Up

    SiUS331708EE Field Setting from Remote Controller 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 176: List Of Field Settings For Outdoor-Air Processing Unit

    Field Setting from Remote Controller SiUS331708EE 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 177 SiUS331708EE Field Setting from Remote Controller 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 178: Field Settings From Outdoor Unit

    Field Settings from Outdoor Unit SiUS331708EE 2. Field Settings from Outdoor Unit Capacity Setting Caution Be sure to carry out capacity setting after changing the main PCB (A1P) to spare PCB. (for RXSQ24/36TBVJUB and 48 class models only) Attach the capacity setting adaptor corresponding to capacity class to connector X51A. Other than RXSQ24/36TBVJUB and 48 class models, no capacity setting is required.

  • Page 179: Setting Mode And Monitor Mode

    SiUS331708EE 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 180: Setting Mode 1

    Field Settings from Outdoor Unit SiUS331708EE 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 181: Setting Mode 2

    SiUS331708EE 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 182 Field Settings from Outdoor Unit SiUS331708EE Setting of heat pump Make this setting for heat pump lockout. lockout 2 Cooling comfort setting Selects comfort level of VRT cooling. 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...
  • Page 183 SiUS331708EE 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 184 Field Settings from Outdoor Unit SiUS331708EE 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 185 SiUS331708EE 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 29 Capacity precedence k h h h h k h setting k h h h h h k 60 % demand...
  • Page 186 Field Settings from Outdoor Unit SiUS331708EE 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 187: Monitor Mode

    SiUS331708EE 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 188 Field Settings from Outdoor Unit SiUS331708EE  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 189: Setting Of Low Noise Operation And Demand Operation

    SiUS331708EE 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 190 Field Settings from Outdoor Unit SiUS331708EE 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 191: Setting Of Refrigerant Recovery Mode

    SiUS331708EE 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 192: Setting Of Vacuuming Mode

    Field Settings from Outdoor Unit SiUS331708EE 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 193: Check Operation

    SiUS331708EE Field Settings from Outdoor Unit Note(s)  The operation is not possible when a vessel is attached to the liquid piping.  Refrigerant charge mode ends in 60 minutes. If 60 minutes is not long enough, begin the procedure again from step (1). ...

  • Page 194: Setting Of Auxiliary Heater Control

    Field Settings from Outdoor Unit SiUS331708EE 2.11 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 195: Setting Of Heat Pump Lockout And Emergency Heat Mode

    SiUS331708EE Field Settings from Outdoor Unit 2.12 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 196 Field Settings from Outdoor Unit SiUS331708EE 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 197: Test Operation

    SiUS331708EE 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 198: Test Operation

    Test Operation SiUS331708EE 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 199 SiUS331708EE 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 200 Test Operation SiUS331708EE 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 201: Gas Furnace Test Operation

    SiUS331708EE 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 202: Error Codes And Corresponding Measures

    Test Operation SiUS331708EE 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 203 SiUS331708EE 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 204: When Turning On Power First Time

    Test Operation SiUS331708EE 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 205: Part 6 Service Diagnosis

    SiUS331708EE Part 6 Service Diagnosis 1. Servicing Items to be Confirmed .............201 1.1 Troubleshooting..................201 1.2 Precautions for Maintenance..............201 1.3 Refrigerant Properties (R-410A)............... 203 2. Symptom-based Troubleshooting ............204 2.1 Indoor Unit Overall ................... 204 2.2 With Infrared Presence/Floor Sensor ............207 2.3 With Gas Furnace ..................
  • Page 206 SiUS331708EE 5.25 Indoor Blower Does Not Have Required Parameters to Function.... 262 5.26 Remote Sensor Abnormality ..............263 5.27 Humidity Sensor System Abnormality ............264 5.28 Infrared Presence/Floor Sensor Error ............265 5.29 Remote Controller Thermistor Abnormality ..........270 5.30 Outdoor Unit Main PCB Abnormality............271 5.31 Activation of High Pressure Switch ............
  • Page 207 SiUS331708EE 5.69 Central Control Indicator Lamp Blinking (One blink) ........ 324 5.70 Central Control Indicator Lamp Blinking (Two blinks) ......327 6. Check ......................328 6.1 High Pressure Check ................328 6.2 Low Pressure Check ................329 6.3 Superheat Operation Check..............331 6.4 Power Transistor Check ................

  • Page 208: Servicing Items To Be Confirmed

    Servicing Items to be Confirmed SiUS331708EE 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 209 SiUS331708EE 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 210: Refrigerant Properties (R-410A)

    Servicing Items to be Confirmed SiUS331708EE 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 211: Symptom-Based Troubleshooting

    SiUS331708EE 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 212 Symptom-based Troubleshooting SiUS331708EE 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 213 SiUS331708EE 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 214: With Infrared Presence/Floor Sensor

    Symptom-based Troubleshooting SiUS331708EE With Infrared Presence/Floor Sensor Condition Measure Louver operation different from setting or no downward airflow Refer to the flowchart below. in heating operation Individual airflow direction setting different from the actual Refer to the flowchart below. airflow direction 3 While not operating, the louver does not close completely.

  • Page 215: With Gas Furnace

    SiUS331708EE 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 216: Error Code Via Remote Controller

    Error Code via Remote Controller SiUS331708EE 3. Error Code via Remote Controller Wired Remote Controller 3.1.1 BRC1E73 The following will be displayed on the screen when an error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Screen Operation lamp (1) Checking an error or warning.

  • Page 217: Wireless Remote Controller

    SiUS331708EE 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 218 Error Code via Remote Controller SiUS331708EE  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 219: Error Code Indication By Outdoor Unit Pcb

    SiUS331708EE Error Code Indication by Outdoor Unit PCB 4. Error Code Indication by Outdoor Unit PCB Monitor mode Error Error Description To enter the monitor mode, press the Code 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 220 Error Code Indication by Outdoor Unit PCB SiUS331708EE 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 221 SiUS331708EE Error Code Indication by Outdoor Unit PCB Monitor mode Error To enter the monitor mode, press the Error Description Code 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 Selection of setting item...
  • Page 222 Error Code Indication by Outdoor Unit PCB SiUS331708EE 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 223: Troubleshooting By Error Code

    SiUS331708EE 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 224 Troubleshooting by Error Code SiUS331708EE Error Operation Reference Error contents code lamp page Inverter PCB abnormality 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 225: Error Codes (Sub Codes)

    SiUS331708EE 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 226 Troubleshooting by Error Code SiUS331708EE Troubleshooting Error code Error Description Diagnosis Climate Talk Communication system combination Refer to page 313. UH - 05 error (before initial setting for communication completes) Climate Talk Communication system combination Refer to page 314. UH - 06 error (after initial setting for communication completes) Part 6 Service Diagnosis...

  • Page 227: External Protection Device Abnormality

    SiUS331708EE Troubleshooting by Error Code External Protection Device Abnormality 5.3.1 External Protection Device Abnormality (Except FXTQ-TA, FXTQ-TB, and CXTQ-TA) Applicable All indoor unit models (except FXTQ-TA, FXTQ-TB, 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 228: Applicable Models

    Troubleshooting by Error Code SiUS331708EE 5.3.2 External Protection Device Abnormality (FXTQ-TA, FXTQ-TB, CXTQ-TA Only) Applicable FXTQ-TA, FXTQ-TB, 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.

  • Page 229: Indoor Unit Control Pcb Abnormality

    SiUS331708EE 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 230: Drain Level Control System Abnormality

    Troubleshooting by Error Code SiUS331708EE Drain Level Control System Abnormality Applicable FXFQ-AA, FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXZQ-M, FXUQ-P, FXUQ-PA, FXEQ-P, Models FXDQ-M, 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 231 SiUS331708EE 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 232: Indoor Fan Motor Lock, Overload

    Troubleshooting by Error Code SiUS331708EE 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 233 SiUS331708EE 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 234: Indoor Fan Motor Abnormality

    Troubleshooting by Error Code SiUS331708EE Indoor Fan Motor Abnormality 5.7.1 Indoor Fan Motor Abnormality (FXFQ-AA Models) Applicable FXFQ-AA Models Error Code Method of Error  Detection from the current flow on the PCB (A1P) Detection  Detection from the current flow on the PCB when the fan motor starting operation Error Decision ...
  • Page 235 SiUS331708EE Troubleshooting by Error Code The HAP lamp on the indoor unit Replace the indoor unit control control PCB is PCB (A1P). blinking. Replace the fan motor (M1F). 1. Check also if the relay connector between the indoor unit control PCB and the fan motor are correctly connected.
  • Page 236 Troubleshooting by Error Code SiUS331708EE 5.7.2 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 Conditions Supposed...
  • Page 237 SiUS331708EE Troubleshooting by Error Code 5.7.3 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 ...
  • Page 238 Troubleshooting by Error Code SiUS331708EE 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 239 SiUS331708EE 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 240: Blower Motor Not Running

    Troubleshooting by Error Code SiUS331708EE Blower Motor Not Running Applicable FXTQ-TA, FXTQ-TB 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 for the specified number of consecutive times successively, it is deemed abnormal operation.

  • Page 241: Indoor Fan Motor Status Abnormality

    SiUS331708EE Troubleshooting by Error Code Indoor Fan Motor Status Abnormality Applicable FXTQ-TA, FXTQ-TB 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 242: Low Indoor Airflow

    Troubleshooting by Error Code SiUS331708EE 5.10 Low Indoor Airflow Applicable FXTQ-TA, FXTQ-TB 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 243: Swing Flap Motor Abnormality

    SiUS331708EE 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 244 Troubleshooting by Error Code SiUS331708EE 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 245: Power Supply Voltage Abnormality

    SiUS331708EE 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 246: Blower Motor Stops For Over/Under Voltage

    Troubleshooting by Error Code SiUS331708EE 5.13 Blower Motor Stops for Over/Under Voltage Applicable FXTQ-TA, FXTQ-TB 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 247: Electronic Expansion Valve Coil Abnormality, Dust Clogging

    SiUS331708EE 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 248: Gas Furnace Abnormality

    Troubleshooting by Error Code SiUS331708EE 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 249: Drain Level Above Limit

    SiUS331708EE Troubleshooting by Error Code 5.16 Drain Level above Limit Applicable FXFQ-AA, FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXZQ-M, FXUQ-P, FXUQ-PA, FXEQ-P, Models FXDQ-M, 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 250: Self-Cleaning Decoration Panel Abnormality

    Troubleshooting by Error Code SiUS331708EE 5.17 Self-Cleaning Decoration Panel Abnormality Applicable FXFQ-AA (when self-cleaning decoration panel BYCQ54EEGFU is installed) Models FXFQ-T (when self-cleaning decoration panel BYCQ125BGW1 is installed) 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.
  • Page 251 SiUS331708EE 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 252 Troubleshooting by Error Code SiUS331708EE 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 253 SiUS331708EE 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 254 Troubleshooting by Error Code SiUS331708EE 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 error Is the inside of dust collection port clogged Clean the dust from the inside by dust? of dust collection port.
  • Page 255 SiUS331708EE 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 256 Troubleshooting by Error Code SiUS331708EE 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 257 SiUS331708EE 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 258 Troubleshooting by Error Code SiUS331708EE 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 259 SiUS331708EE 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 260 Troubleshooting by Error Code SiUS331708EE 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 261: Defective Capacity Setting

    SiUS331708EE Troubleshooting by Error Code 5.18 Defective Capacity Setting 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 262: Transmission Abnormality Between Indoor Unit Control Pcb And Fan Pcb

    Troubleshooting by Error Code SiUS331708EE 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 263 SiUS331708EE 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 264: Blower Motor Communication Error

    Troubleshooting by Error Code SiUS331708EE 5.20 Blower Motor Communication Error Applicable FXTQ-TA, FXTQ-TB 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 265: Climate Talk Communication Error

    SiUS331708EE 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 266: Thermistor Abnormality

    Troubleshooting by Error Code SiUS331708EE 5.22 Thermistor Abnormality Applicable C4, C5: All indoor units Models C9: except FXTQ-TA, FXTQ-TB, 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 267: Combination Error Between Indoor Unit Control Pcb And Fan Pcb

    SiUS331708EE 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 268: Blower Motor Hp Mismatch

    Troubleshooting by Error Code SiUS331708EE 5.24 Blower Motor HP Mismatch Applicable FXTQ-TA, FXTQ-TB 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 269: Indoor Blower Does Not Have Required Parameters To Function

    SiUS331708EE Troubleshooting by Error Code 5.25 Indoor Blower Does Not Have Required Parameters to Function Applicable FXTQ-TA, FXTQ-TB 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 270: Remote Sensor Abnormality

    Troubleshooting by Error Code SiUS331708EE 5.26 Remote Sensor Abnormality Applicable FXTQ-TA, FXTQ-TB, 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 271: Humidity Sensor System Abnormality

    SiUS331708EE Troubleshooting by Error Code 5.27 Humidity Sensor System Abnormality Applicable 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 272: Infrared Presence/Floor Sensor Error

    Troubleshooting by Error Code SiUS331708EE 5.28 Infrared Presence/Floor Sensor Error Applicable FXFQ-AA, 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 273: Diagnosis Procedure

    SiUS331708EE 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 274 Troubleshooting by Error Code SiUS331708EE 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 275 SiUS331708EE 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 276 Troubleshooting by Error Code SiUS331708EE 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 277: Remote Controller Thermistor Abnormality

    SiUS331708EE 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 278: Outdoor Unit Main Pcb Abnormality

    Troubleshooting by Error Code SiUS331708EE 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 279: Activation Of High Pressure Switch

    SiUS331708EE 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 280 Troubleshooting by Error Code SiUS331708EE 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 281: Activation Of Low Pressure Sensor

    SiUS331708EE 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 282: Compressor Motor Lock

    Troubleshooting by Error Code SiUS331708EE 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 compressor motor does not start up even in forced startup mode.
  • Page 283 SiUS331708EE 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 284: Outdoor Fan Motor Abnormality

    Troubleshooting by Error Code SiUS331708EE 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 285 SiUS331708EE 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 286: Electronic Expansion Valve Coil Abnormality

    Troubleshooting by Error Code SiUS331708EE 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 287: Discharge Pipe Temperature Abnormality

    SiUS331708EE 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 ...
  • Page 288 Troubleshooting by Error Code SiUS331708EE Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the model a TBVJUB model? And, does the error code on the outdoor unit indicate activation of the overload protector? ( 1)

  • Page 289: Thermistor Abnormality

    SiUS331708EE Troubleshooting by Error Code 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 290: High Pressure Sensor Abnormality

    Troubleshooting by Error Code SiUS331708EE 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 291: Low Pressure Sensor Abnormality

    SiUS331708EE Troubleshooting by Error Code 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 292: Inverter Pcb Abnormality

    Troubleshooting by Error Code SiUS331708EE 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 293: Radiation Fin Temperature Rise Abnormality

    SiUS331708EE Troubleshooting by Error Code 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 294: Compressor Instantaneous Overcurrent

    Troubleshooting by Error Code SiUS331708EE 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 295: Compressor Overcurrent

    SiUS331708EE Troubleshooting by Error Code 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 296: Compressor Startup Abnormality

    Troubleshooting by Error Code SiUS331708EE 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 297: Transmission Error Between Microcomputers On Outdoor Unit Main Pcb

    SiUS331708EE Troubleshooting by Error Code 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 298: Inverter Circuit Capacitor High Voltage

    Troubleshooting by Error Code SiUS331708EE 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 299: Radiation Fin Thermistor Abnormality

    SiUS331708EE Troubleshooting by Error Code 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 300: Refrigerant Shortage

    Troubleshooting by Error Code SiUS331708EE 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 301 SiUS331708EE 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 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 302: Power Supply Insufficient Or Instantaneous Abnormality

    Troubleshooting by Error Code SiUS331708EE 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 303 SiUS331708EE 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 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 304: Check Operation Not Executed

    Troubleshooting by Error Code SiUS331708EE 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 305: Transmission Error Between Indoor Units And Outdoor Units

    SiUS331708EE Troubleshooting by Error Code 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 306 Troubleshooting by Error Code SiUS331708EE 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 307: Transmission Error Between Remote Controller And Indoor Unit

    SiUS331708EE Troubleshooting by Error Code 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 308: Transmission Error Between Main And Sub Remote Controllers

    Troubleshooting by Error Code SiUS331708EE 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 309: Transmission Error Between Indoor Units And Outdoor Units In The Same System

    SiUS331708EE Troubleshooting by Error Code 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 310: Improper Combination Of Indoor And Outdoor Units, Indoor Units And Remote Controller

    Troubleshooting by Error Code SiUS331708EE 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 311 SiUS331708EE 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 outdoor unit PCB Check the model name of the replaced by the backup PCB? outdoor unit PCB and then replace the old one.

  • Page 312: Incorrect Gas Furnace Connecting Number

    Troubleshooting by Error Code SiUS331708EE 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 313: Incorrect Electric Heater Capacity Setting

    SiUS331708EE Troubleshooting by Error Code 5.57 Incorrect Electric Heater Capacity Setting Applicable FXTQ-TA, FXTQ-TB 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 314: Address Duplication Of Centralized Controller

    Troubleshooting by Error Code SiUS331708EE 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 315: Transmission Error Between Centralized Controller And Indoor Unit

    SiUS331708EE Troubleshooting by Error Code 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 316 Troubleshooting by Error Code SiUS331708EE 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 317 SiUS331708EE Troubleshooting by Error Code 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 318: System Not Set Yet

    Troubleshooting by Error Code SiUS331708EE 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 319: System Abnormality, Refrigerant System Address Undefined

    SiUS331708EE Troubleshooting by Error Code 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 320: Climate Talk Communication System Combination Error (Before Initial Setting For Communication Completes)

    Troubleshooting by Error Code SiUS331708EE 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 321: Climate Talk Communication System Combination Error (After Initial Setting For Communication Completes)

    SiUS331708EE Troubleshooting by Error Code 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 322: Defective Pcb

    Troubleshooting by Error Code SiUS331708EE 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 323: Transmission Error (Between Centralized Controllers)

    SiUS331708EE Troubleshooting by Error Code 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 324 Troubleshooting by Error Code SiUS331708EE 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 325: Poor Centralized Controller Combination

    SiUS331708EE Troubleshooting by Error Code 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 326 Troubleshooting by Error Code SiUS331708EE 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 327: Address Duplication, Poor Setting

    SiUS331708EE Troubleshooting by Error Code 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 328 Troubleshooting by Error Code SiUS331708EE 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 329: Operation Lamp Blinking

    SiUS331708EE Troubleshooting by Error Code 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 330 Troubleshooting by Error Code SiUS331708EE 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 331: Central Control Indicator Lamp Blinking (One Blink)

    SiUS331708EE Troubleshooting by Error Code 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 332 Troubleshooting by Error Code SiUS331708EE 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 333 SiUS331708EE Troubleshooting by Error Code 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 334: Central Control Indicator Lamp Blinking (Two Blinks)

    Troubleshooting by Error Code SiUS331708EE 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 335: Check

    SiUS331708EE Check 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 pressure Bent or crashed pipe Conduct visual checks for pipe conditions.

  • Page 336: Low Pressure Check

    Check SiUS331708EE 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 337 SiUS331708EE Check Reference CHECK 7 Refer to page 335. Reference CHECK 8 Refer to page 336. Part 6 Service Diagnosis...

  • Page 338: Superheat Operation Check

    Check SiUS331708EE 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 339 SiUS331708EE Check Reference CHECK 7 Refer to page 335. Reference CHECK 8 Refer to page 336. Part 6 Service Diagnosis...

  • Page 340: Power Transistor Check

    Check SiUS331708EE 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 341: Refrigerant Overcharge Check

    SiUS331708EE Check 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 342: Refrigerant Shortage Check

    Check SiUS331708EE 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 343: Vacuuming And Dehydration Procedure

    SiUS331708EE Check 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 344: List Of Inverter-Related Error Codes

    Check SiUS331708EE 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 345: Concept Of Inverter-Related Error Codes

    SiUS331708EE Check 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 346: Thermistor Check

    Check SiUS331708EE 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-AA Type A — Type C FXFQ-T — Type J FXFQ-P Type D —...
  • Page 347 SiUS331708EE Check 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 348 Check SiUS331708EE 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 349: Pressure Sensor Check

    SiUS331708EE Check 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 350: Master Unit Centralized Connector Setting Table

    Check SiUS331708EE 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 351: Master-Slave Unit Setting Table

    SiUS331708EE Check 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 352: Fan Motor Connector Check (Power Supply Cable)

    Check SiUS331708EE 6.15 Fan Motor Connector Check (Power Supply Cable) CHECK 16 Check the fan motor connector according to the following procedure. Indoor Unit FXFQ-AA 1. Turn the power supply OFF. 2. Disconnect the fan motor connector from the PCB and measure the resistances between U-V, V-W and W-U.

  • Page 353: Fan Motor Connector Check (Signal Cable)

    SiUS331708EE Check 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 354 Check SiUS331708EE FXEQ-P, FXUQ-PA — (1) — White (2) Orange (3) Brown (4) Blue (5) — (6) — — (7) — Red (8) Measuring points Judgment criteria 1  or more 2 - 5 1  or more 3 - 5 1 ...

  • Page 355: Electronic Expansion Valve Coil Check

    SiUS331708EE Check 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 356 Check SiUS331708EE Indoor Unit FXFQ-AA, FXFQ-T, FXFQ-P, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXSQ-TA, FXSQ-TB, FXMQ-TB, FXTQ-TA, FXTQ-TB, CXTQ-TA Orange (1) Red (2) Yellow (3) Black (4) — (5) Gray (6) Measuring points Judgment criteria 1 - 6 2 - 6 35-55 ...

  • Page 357: Fan Motor Connector Check For Fxtq-Ta, Fxtq-Tb

    SiUS331708EE Check 6.18 Fan Motor Connector Check for FXTQ-TA, FXTQ-TB CHECK 19 CHECKING EMERSON ULTRATECH ECM MOTORS The FXTQ-TA and FXTQ-TB 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 358 Check SiUS331708EE 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 359 SiUS331708EE Check 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 360: Motor Checks

    Check SiUS331708EE 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 361: Part 7 Appendix

    SiUS331708EE Part 7 Appendix 1. Wiring Diagrams..................355 1.1 Outdoor Unit ..................... 355 1.2 Indoor Unit....................364 1.3 Air Treatment Equipment ................. 386 Part 7 Appendix...

  • Page 362: Wiring Diagrams

    Wiring Diagrams SiUS331708EE 1. Wiring Diagrams Outdoor Unit RXSQ24/36TAVJU Part 7 Appendix...
  • Page 363 SiUS331708EE Wiring Diagrams RXSQ24/36TAVJUA, RXSQ24/36TBVJUA Part 7 Appendix...
  • Page 364 Wiring Diagrams SiUS331708EE RXSQ24/36TBVJUB Part 7 Appendix...
  • Page 365 SiUS331708EE Wiring Diagrams RXSQ48TAVJU Part 7 Appendix...
  • Page 366 Wiring Diagrams SiUS331708EE RXSQ48TAVJUA, RXSQ48TBVJUA Part 7 Appendix...
  • Page 367 SiUS331708EE Wiring Diagrams RXSQ48TBVJUB Part 7 Appendix...
  • Page 368 Wiring Diagrams SiUS331708EE RXSQ60TAVJU Part 7 Appendix...
  • Page 369 SiUS331708EE Wiring Diagrams RXSQ60TAVJUA, RXSQ60TBVJUA Part 7 Appendix...
  • Page 370 Wiring Diagrams SiUS331708EE RXSQ60TBVJUB Part 7 Appendix...

  • Page 371: Indoor Unit

    SiUS331708EE Wiring Diagrams Indoor Unit FXFQ07/09/12/15/18/24/30/36/48/54AAVJU Part 7 Appendix...
  • Page 372 Wiring Diagrams SiUS331708EE BYCQ54EEGFU (Self-Cleaning Decoration Panel for FXFQ-AA) Part 7 Appendix...
  • Page 373 SiUS331708EE Wiring Diagrams FXFQ07/09/12/15/18/24/30/36/48TVJU Part 7 Appendix...
  • Page 374 Wiring Diagrams SiUS331708EE BYCQ125BGW1 (Self-Cleaning Decoration Panel for FXFQ-T) Part 7 Appendix...
  • Page 375 SiUS331708EE Wiring Diagrams FXFQ09/12/18/24/30/36/48PVJU Part 7 Appendix...
  • Page 376 Wiring Diagrams SiUS331708EE FXZQ05/07/09/12/15/18TAVJU Part 7 Appendix...
  • Page 377 SiUS331708EE Wiring Diagrams FXZQ05/07/09/12/15/18TBVJU Part 7 Appendix...
  • Page 378 Wiring Diagrams SiUS331708EE FXZQ07/09/12/15/18MVJU9 Part 7 Appendix...
  • Page 379 SiUS331708EE Wiring Diagrams FXUQ18/24/30/36PVJU Part 7 Appendix...
  • Page 380 Wiring Diagrams SiUS331708EE FXUQ18/24/30/36PAVJU Part 7 Appendix...
  • Page 381 SiUS331708EE Wiring Diagrams FXEQ07/09/12/15/18/24PVJU Part 7 Appendix...
  • Page 382 Wiring Diagrams SiUS331708EE FXDQ07/09/12/18/24MVJU Part 7 Appendix...
  • Page 383 SiUS331708EE Wiring Diagrams FXSQ05/07/09/12/15/18/24/30/36/48/54TAVJU Part 7 Appendix...
  • Page 384 Wiring Diagrams SiUS331708EE FXSQ05/07/09/12/15/18/24/30/36/48/54TBVJU Part 7 Appendix...
  • Page 385 SiUS331708EE Wiring Diagrams FXMQ07/09/12/15/18/24/30/36/48/54PBVJU Part 7 Appendix...
  • Page 386 Wiring Diagrams SiUS331708EE FXMQ15/18/24/30/36/48/54TBVJU Part 7 Appendix...
  • Page 387 SiUS331708EE Wiring Diagrams FXHQ12/24/36MVJU Part 7 Appendix...
  • Page 388 Wiring Diagrams SiUS331708EE FXAQ07/09/12/18/24PVJU Part 7 Appendix...
  • Page 389 SiUS331708EE Wiring Diagrams FXLQ07/09/12/18/24MVJU, FXNQ07/09/12/18/24MVJU Part 7 Appendix...
  • Page 390 Wiring Diagrams SiUS331708EE FXTQ09/12/18/24/30/36/42/48/54/60TAVJUA, FXTQ09/12/18/24/30/36/42/48/54/60TAVJUD (SEE NOTE 4) 208/230 (SEE NOTE 8) GROUND LUG HEATER KIT (SEE NOTE 5) INSTALLING AUX ALARM (ALARM) DISCONNECT SWITCH WIRING (SEE NOTE 6) (SEE NOTE 8) (SEE NOTE 1) (SEE NOTE 1) 24VAC 24VAC 10 11 12 RELAY IN (ACC-IN)
  • Page 391 SiUS331708EE Wiring Diagrams FXTQ09/12/18/24/30/36/42/48/54/60TBVJUA, FXTQ09/12/18/24/30/36/42/48/54/60TBVJUD (SEE NOTE 4) 208/230 (SEE NOTE 8) GROUND LUG HEATER KIT 208/230 VAC (SEE NOTE 5) INSTALLING AUX ALARM (ALARM) DISCONNECT SWITCH WIRING (SEE NOTE 6) (SEE NOTE 8) (SEE NOTE 1 & 9) (SEE NOTE 1 & 9) 24VAC 24VAC 10 11 12...
  • Page 392 Wiring Diagrams SiUS331708EE CXTQ24/36/48/60TASBLU Part 7 Appendix...

  • Page 393: Air Treatment Equipment

    SiUS331708EE Wiring Diagrams Air Treatment Equipment 1.3.1 Outdoor-Air Processing Unit FXMQ48/72MFVJU Part 7 Appendix...
  • Page 394 Wiring Diagrams SiUS331708EE 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Part 7 Appendix...
  • Page 395 SiUS331708EE Wiring Diagrams VAM1200GVJU Part 7 Appendix...
  • Page 396 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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