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Daikin REYQ-AATJA Service Manual

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Table of Contents

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SiUS372201EA
Service
Manual
REYQ-AATJA, 208/230 V
REYQ-AAYDA, 460 V
Heat Recovery 60 Hz

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Summary of Contents for Daikin REYQ-AATJA

  • Page 1 SiUS372201EA Service Manual REYQ-AATJA, 208/230 V REYQ-AAYDA, 460 V Heat Recovery 60 Hz...
  • Page 2 4.1 Connection Ratio..................17 4.2 Outdoor Unit Combinations ................ 18 4.3 Limitation of Capacity Index for Heat Recovery ......... 19 5. Specifications ....................20 5.1 REYQ-AATJA..................... 20 5.2 REYQ-AAYDA.................... 29 Part 2 Refrigerant Circuit..............38 1. Refrigerant Circuit (Piping Diagrams) ............39 1.1 Outdoor Unit ....................
  • Page 3 SiUS372201EA Part 3 Remote Controller ..............92 1. Applicable Models ..................93 2. Names and Functions ................94 2.1 BRC1E73 ....................94 2.2 BRC1H71W....................97 2.3 Wireless Remote Controller ..............105 3. Main/Sub Setting..................106 3.1 BRC1E73 ....................106 3.2 BRC1H71W....................108 3.3 When Wireless Remote Controller is Used Together....... 110 4.
  • Page 4 SiUS372201EA 7. Special Control..................145 7.1 Pump Down Residual Operation .............. 145 7.2 Oil Return Operation ................146 7.3 Defrost Operation ..................149 7.4 Outdoor Unit Rotation................152 7.5 Cooling/Heating Mode Switching ............. 153 8. Other Control...................156 8.1 Backup Operation..................156 8.2 Demand Operation ...................
  • Page 5 SiUS372201EA 3.2 Field Settings for Multi Branch Selector Unit (Standard Series)....258 3.3 Field Settings for Multi Branch Selector Unit (Flex Series) ...... 259 3.4 How to Check Miswiring for Multi Branch Selector Unit ......261 4. Test Operation ..................262 4.1 Checks before Test Operation ..............
  • Page 6 SiUS372201EA 3.29 Humidity Sensor System Abnormality ............334 3.30 Infrared Presence/Floor Sensor Error ............335 3.31 Remote Controller Thermistor Abnormality ..........340 3.32 Outdoor Unit Main/Sub PCB Abnormality ..........341 3.33 Detection of Ground Leakage by Leak Detection Circuit ......342 3.34 Missing of Ground Leakage Detection Core ..........
  • Page 7 SiUS372201EA 3.73 Incorrect Gas Furnace Connecting Number..........413 3.74 Incorrect Electric Heater Capacity Setting..........414 3.75 Address Duplication of Centralized Controller.......... 415 3.76 Transmission Error between Centralized Controller and Indoor Unit ..416 3.77 System Not Set Yet .................. 419 3.78 System Abnormality, Refrigerant System Address Undefined ....
  • Page 8 SiUS372201EA 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 SiUS372201EA 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 SiUS372201EA 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 SiUS372201EA 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 SiUS372201EA 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 SiUS372201EA 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 SiUS372201EA 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 SiUS372201EA Revision History 3. Revision History Month / Year Version Revised contents 03 / 2022 SiUS372201E First edition Addition of error codes and prediction codes 12 / 2022 SiUS372201EA Model addition: FXSQ05-54TBVJU, FXMQ15-54TBVJU Introduction...

  • Page 16: Table Of Contents

    3. Combination of Outdoor Units..............16 4. Capacity Range..................17 4.1 Connection Ratio..................17 4.2 Outdoor Unit Combinations ................ 18 4.3 Limitation of Capacity Index for Heat Recovery ......... 19 5. Specifications ....................20 5.1 REYQ-AATJA..................... 20 5.2 REYQ-AAYDA.................... 29 Part 1 General Information...

  • Page 17: Model Names

    SiUS372201EA Model Names 1. Model Names Outdoor Unit REYQ-AATJA (208/230 V) Capacity range (ton) Power supply, Standard Capacity index Heat recovery REYQ 72AA 96AA 120AA 144AA 168AA 192AA 216AA 240AA 264AA Capacity range (ton) Power supply, Standard Capacity index Heat recovery...

  • Page 18: Indoor Unit

    Model Names SiUS372201EA Indoor Unit Capacity range (ton) 1.25 Power supply, Capacity index Standard Ceiling mounted cassette FXFQ — — — — — — — (Round flow with sensing) type VISTA 2'×2' 05TA 07TA 09TA 12TA 15TA 18TA — — —...

  • Page 19: External Appearance

    SiUS372201EA External Appearance 2. External Appearance Outdoor Unit Single Outdoor Unit REYQ72AATJA REYQ72AAYDA 6 ton REYQ96AATJA REYQ120AATJA REYQ96AAYDA REYQ120AAYDA REYQ144AATJA REYQ168AATJA REYQ144AAYDA REYQ168AAYDA 8, 10, 12, 14 ton REYQ192AATJA REYQ216AATJA REYQ240AATJA REYQ192AAYDA REYQ216AAYDA REYQ240AAYDA 16, 18, 20 ton Part 1 General Information...
  • Page 20 External Appearance SiUS372201EA Double Outdoor Unit REYQ264AATJA REYQ288AATJA REYQ264AAYDA REYQ288AAYDA REYQ312AATJA REYQ336AATJA REYQ312AAYDA REYQ336AAYDA 22, 24, 26, 28 ton REYQ360AATJA REYQ360AAYDA 30 ton REYQ384AATJA REYQ408AATJA REYQ432AATJA REYQ384AAYDA REYQ408AAYDA REYQ432AAYDA REYQ456AATJA REYQ480AATJA REYQ456AAYDA REYQ480AAYDA 32, 34, 36, 38, 40 ton Part 1 General Information...

  • Page 21: Branch Selector Unit

    SiUS372201EA External Appearance Branch Selector Unit Single Branch Selector Unit BSQ-T BSQ-TA Multi Branch Selector Unit (Standard Series) BS-Q54T BS-Q54TA Multi Branch Selector Unit (Flex Series) BSF-Q54T Indoor Unit Ceiling mounted cassette (Round flow with sensing) type 4 way blow ceiling suspended type FXFQ-T FXUQ-P FXUQ-PA...

  • Page 22: Air Treatment Equipment

    External Appearance SiUS372201EA Slim ceiling mounted duct type Wall mounted type FXDQ-M FXAQ-P MSP concealed ducted type Floor standing type FXSQ-TA FXLQ-M FXSQ-TB Ceiling mounted duct type (Middle and high static pressure) Concealed floor standing type FXMQ-PB FXNQ-M Ceiling mounted duct type (High static pressure) Air handling unit FXMQ-TB FXTQ-TA...

  • Page 23: Combination Of Outdoor Units

    SiUS372201EA Combination of Outdoor Units 3. Combination of Outdoor Units Module System capacity Number Outdoor unit multi (Ton) of units connection piping kit 1 — BHFP26P100U BHFP26P100UA Notes: 1 For multiple connection, the outdoor unit multi connection piping kit (separately sold) is required. Part 1 General Information...

  • Page 24: Capacity Range

    Capacity Range SiUS372201EA 4. Capacity Range Connection Ratio Total capacity index of the indoor units Connection ratio = Capacity index of the outdoor units Max. connection ratio Types of connected Type of connected air indoor units treatment equipment Min. When using When using at FXMQ-MF Type...

  • Page 25: Outdoor Unit Combinations

    SiUS372201EA Capacity Range Outdoor Unit Combinations Capacity range (Ton) 72AATJA 96AATJA 120AATJA 144AATJA 168AATJA 192AATJA 216AATJA REYQ 72AAYDA 96AAYDA 120AAYDA 144AAYDA 168AAYDA 192AAYDA 216AAYDA Max. number of connectable indoor units Total capacity index of indoor 36-93 48-124 60-156 72-187 84-218 96-249 108-280 units to be...

  • Page 26: Limitation Of Capacity Index For Heat Recovery

    Capacity Range SiUS372201EA Limitation of Capacity Index for Heat Recovery Single Branch Selector Unit BSQ36TVJ BSQ60TVJ BSQ96TVJ Model BSQ36TAVJ BSQ60TAVJ BSQ96TAVJ Maximum number of connectable indoor units Total capacity index of 36 or less More than 36 and 60 or less More than 60 and 96 or less connectable indoor units Multi Branch Selector Unit (Standard Series)

  • Page 27: Specifications

    SiUS372201EA Specifications 5. Specifications REYQ-AATJA Model name REYQ72AATJA REYQ96AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 72,000 (21.1) 96,000 (28.1) Btu/h capacity (kW) Rated 69,000 (20.2) 92,000 (27.0) 2 Heating Nominal 81,000 (23.7)
  • Page 28 Specifications SiUS372201EA Model name REYQ120AATJA REYQ144AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 120,000 (35.2) 144,000 (42.2) Btu/h capacity (kW) Rated 114,000 (33.4) 138,000 (40.4) 2 Heating Nominal 135,000 (39.6) 162,000 (47.5) Btu/h capacity...
  • Page 29 SiUS372201EA Specifications Model name REYQ168AATJA REYQ192AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 168,000 (49.2) 192,000 (56.3) Btu/h capacity (kW) Rated 160,000 (46.9) 184,000 (53.9) 2 Heating Nominal 189,000 (55.4) 216,000 (63.3) Btu/h capacity...
  • Page 30 Specifications SiUS372201EA Model name REYQ216AATJA REYQ240AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 216,000 (63.3) 240,000 (70.3) Btu/h capacity (kW) Rated 206,000 (60.4) 228,000 (66.8) 2 Heating Nominal 243,000 (71.2) 270,000 (79.1) Btu/h capacity...
  • Page 31 SiUS372201EA Specifications Model name (Combination unit) REYQ264AATJA REYQ288AATJA REYQ120AATJA REYQ144AATJA Model name (Independent unit) REYQ144AATJA REYQ144AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 264,000 (77.4) 288,000 (84.4) Btu/h capacity (kW) Rated 252,000 (73.9) 274,000 (80.3)
  • Page 32 Specifications SiUS372201EA Model name (Combination unit) REYQ312AATJA REYQ336AATJA REYQ144AATJA REYQ168AATJA Model name (Independent unit) REYQ168AATJA REYQ168AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 312,000 (91.4) 336,000 (98.5) Btu/h capacity (kW) Rated 296,000 (86.7) 320,000 (93.8)
  • Page 33 SiUS372201EA Specifications Model name (Combination unit) REYQ360AATJA REYQ384AATJA REYQ168AATJA REYQ192AATJA Model name (Independent unit) REYQ192AATJA REYQ192AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 360,000 (106) 384,000 (113) Btu/h capacity (kW) Rated 342,000 (100) 364,000 (107)
  • Page 34 Specifications SiUS372201EA Model name (Combination unit) REYQ408AATJA REYQ432AATJA REYQ192AATJA REYQ216AATJA Model name (Independent unit) REYQ216AATJA REYQ216AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 408,000 (120) 432,000 (127) Btu/h capacity (kW) Rated 388,000 (114) 410,000 (120)
  • Page 35 SiUS372201EA Specifications Model name (Combination unit) REYQ456AATJA REYQ480AATJA REYQ216AATJA REYQ240AATJA Model name (Independent unit) REYQ240AATJA REYQ240AATJA Power supply 3 phase, 208/230 V, 60 Hz 3 phase, 208/230 V, 60 Hz 1 Cooling Nominal 456,000 (134) 480,000 (141) Btu/h capacity (kW) Rated 434,000 (127) 456,000 (134)

  • Page 36: Reyq-Aayda

    Specifications SiUS372201EA REYQ-AAYDA Model name REYQ72AAYDA REYQ96AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 72,000 (21.1) 96,000 (28.1) Btu/h capacity (kW) Rated 69,000 (20.2) 92,000 (27.0) 2 Heating Nominal 81,000 (23.7) 108,000 (31.7) Btu/h capacity...
  • Page 37 SiUS372201EA Specifications Model name REYQ120AAYDA REYQ144AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 120,000 (35.2) 144,000 (42.2) Btu/h capacity (kW) Rated 114,000 (33.4) 138,000 (40.4) 2 Heating Nominal 135,000 (39.6) 162,000 (47.5) Btu/h capacity...
  • Page 38 Specifications SiUS372201EA Model name REYQ168AAYDA REYQ192AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 168,000 (49.2) 192,000 (56.3) Btu/h capacity (kW) Rated 160,000 (46.9) 184,000 (53.9) 2 Heating Nominal 189,000 (55.4) 216,000 (63.3) Btu/h capacity...
  • Page 39 SiUS372201EA Specifications Model name REYQ216AAYDA REYQ240AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 216,000 (63.3) 240,000 (70.3) Btu/h capacity (kW) Rated 206,000 (60.4) 228,000 (66.8) 2 Heating Nominal 243,000 (71.2) 270,000 (79.1) Btu/h capacity...
  • Page 40 Specifications SiUS372201EA Model name (Combination unit) REYQ264AAYDA REYQ288AAYDA REYQ120AAYDA REYQ144AAYDA Model name (Independent unit) REYQ144AAYDA REYQ144AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 264,000 (77.4) 288,000 (84.4) Btu/h capacity (kW) Rated 252,000 (73.9) 274,000 (80.3)
  • Page 41 SiUS372201EA Specifications Model name (Combination unit) REYQ312AAYDA REYQ336AAYDA REYQ144AAYDA REYQ168AAYDA Model name (Independent unit) REYQ168AAYDA REYQ168AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 312,000 (91.4) 336,000 (98.5) Btu/h capacity (kW) Rated 296,000 (86.7) 320,000 (93.8)
  • Page 42 Specifications SiUS372201EA Model name (Combination unit) REYQ360AAYDA REYQ384AAYDA REYQ168AAYDA REYQ192AAYDA Model name (Independent unit) REYQ192AAYDA REYQ192AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 360,000 (106) 384,000 (113) Btu/h capacity (kW) Rated 342,000 (100) 364,000 (107)
  • Page 43 SiUS372201EA Specifications Model name (Combination unit) REYQ408AAYDA REYQ432AAYDA REYQ192AAYDA REYQ216AAYDA Model name (Independent unit) REYQ216AAYDA REYQ216AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 408,000 (120) 432,000 (127) Btu/h capacity (kW) Rated 388,000 (114) 410,000 (120)
  • Page 44 Specifications SiUS372201EA Model name (Combination unit) REYQ456AAYDA REYQ480AAYDA REYQ216AAYDA REYQ240AAYDA Model name (Independent unit) REYQ240AAYDA REYQ240AAYDA Power supply 3 phase, 460 V, 60 Hz 3 phase, 460 V, 60 Hz 1 Cooling Nominal 456,000 (134) 480,000 (141) Btu/h capacity (kW) Rated 434,000 (127) 456,000 (134)
  • Page 45 SiUS372201EA Part 2 Refrigerant Circuit 1. Refrigerant Circuit (Piping Diagrams) ............39 1.1 Outdoor Unit ....................39 1.2 Branch Selector Unit .................. 48 1.3 Indoor Unit....................60 1.4 Outdoor-Air Processing Unit............... 62 2. Functional Parts Layout ................63 2.1 REYQ72AA ....................63 2.2 REYQ96/120AA ..................

  • Page 46: Refrigerant Circuit Part

    Refrigerant Circuit (Piping Diagrams) SiUS372201EA 1. Refrigerant Circuit (Piping Diagrams) Outdoor Unit 1.1.1 REYQ72AA No. in Electric piping Name Function symbol diagram Compressor Compressor is operated on frequencies between 15 rps to 140 rps by using the inverter. Refer to page 131. Fan motor The fan rotation speed is varied by using inverter.
  • Page 47 SiUS372201EA Refrigerant Circuit (Piping Diagrams) No. in Electric piping Name Function symbol diagram Thermistor This detects temperature of liquid pipe for air heat exchanger. (29) (Heat exchanger right upper liquid pipe) Thermistor (30) (Heat exchanger right lower liquid pipe) Thermistor Used to detect liquid pipe temperature of air heat exchanger.
  • Page 48 Refrigerant Circuit (Piping Diagrams) SiUS372201EA Part 2 Refrigerant Circuit...
  • Page 49 SiUS372201EA Refrigerant Circuit (Piping Diagrams) 1.1.2 REYQ96/120/144/168AA No. in Electric piping Name Function symbol diagram Compressor 1 Compressor is operated on frequencies between 15 rps to 140 rps by using the inverter. Refer to page 131. Compressor 2 Fan motor 1 The fan rotation speed is varied by using inverter.
  • Page 50 Refrigerant Circuit (Piping Diagrams) SiUS372201EA No. in Electric piping Name Function symbol diagram Thermistor This detects temperature of liquid pipe for air heat exchanger. (34) (Heat exchanger right upper liquid pipe) Thermistor (35) (Heat exchanger right lower liquid pipe) Thermistor Used to detect liquid pipe temperature of air heat exchanger.
  • Page 51 SiUS372201EA Refrigerant Circuit (Piping Diagrams) Part 2 Refrigerant Circuit...
  • Page 52 Refrigerant Circuit (Piping Diagrams) SiUS372201EA 1.1.3 REYQ192/216/240AA No. in Electric piping Name Function symbol diagram Compressor 1 Compressor is operated on frequencies between 15 rps to 140 rps by using the inverter. Refer to page 131. Compressor 2 Fan motor 1 The fan rotation speed is varied by using inverter.
  • Page 53 SiUS372201EA Refrigerant Circuit (Piping Diagrams) No. in Electric piping Name Function symbol diagram Thermistor Used to detect temperature of the suction pipe before accumulator. (36) (Suction pipe before accumulator) Thermistor This detects temperature of liquid pipe for air heat exchanger. (37) (Heat exchanger right upper liquid pipe)
  • Page 54 Refrigerant Circuit (Piping Diagrams) SiUS372201EA Part 2 Refrigerant Circuit...

  • Page 55: Branch Selector Unit

    SiUS372201EA Refrigerant Circuit (Piping Diagrams) Branch Selector Unit Electric Name Function Symbol Electronic expansion valve (EVSC) In simultaneous cooling and heating, it is used to subcooling liquid refrigerants when an indoor unit downstream of this Branch Selector unit is in heating. (Max : 480 pulse) Electronic expansion valve (EVH) Opens while in heating or all indoor units are in cooling.
  • Page 56 Refrigerant Circuit (Piping Diagrams) SiUS372201EA BSQ36/60/96TAVJ C: 4D133271 Part 2 Refrigerant Circuit...
  • Page 57 SiUS372201EA Refrigerant Circuit (Piping Diagrams) 1.2.2 Multi Branch Selector Unit (Standard Series) BS4Q54TVJ Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Gas pipe Double pipe heat (Subcooling) Electronic Expansion Valve (Suction) Filter connection port exchanger Liquid pipe connection port Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve...
  • Page 58 Refrigerant Circuit (Piping Diagrams) SiUS372201EA BS6Q54TVJ Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Gas pipe Double pipe heat (Subcooling) Electronic Expansion Valve (Suction) Filter exchanger connection port Liquid pipe connection port Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Gas pipe Double pipe heat...
  • Page 59 SiUS372201EA Refrigerant Circuit (Piping Diagrams) BS8Q54TVJ Electronic Expansion Valve ( HP/LP gas ) Electronic Expansion Valve Filter Double pipe heat Gas pipe ( Subcooling ) Electronic Expansion Valve ( Suction ) Filter exchanger connection port Liquid pipe connection port Electronic Expansion Valve ( HP/LP gas ) Electronic Expansion Valve Filter...
  • Page 60 Refrigerant Circuit (Piping Diagrams) SiUS372201EA BS10Q54TVJ Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Double pipe heat Gas pipe (Subcooling) Electronic Expansion Valve (Suction) Filter exchanger connection port Liquid pipe connection port Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Double pipe heat Gas pipe...
  • Page 61 SiUS372201EA Refrigerant Circuit (Piping Diagrams) BS10Q54TAVJ C: 3D133293 Part 2 Refrigerant Circuit...
  • Page 62 Refrigerant Circuit (Piping Diagrams) SiUS372201EA BS12Q54TVJ Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Double pipe heat (Subcooling) Gas pipe Electronic Expansion Valve (Suction) exchanger Filter connection port Liquid pipe connection port Electronic Electronic Expansion Valve (HP/LP gas) Expansion Valve Filter Double pipe heat Gas pipe...
  • Page 63 SiUS372201EA Refrigerant Circuit (Piping Diagrams) BS12Q54TAVJ C: 3D133294 Part 2 Refrigerant Circuit...
  • Page 64 Refrigerant Circuit (Piping Diagrams) SiUS372201EA 1.2.3 Multi Branch Selector Unit (Flex Series) BSF4Q54TVJ C: 3D122813 Part 2 Refrigerant Circuit...
  • Page 65 SiUS372201EA Refrigerant Circuit (Piping Diagrams) BSF6Q54TVJ C: 3D125655 Part 2 Refrigerant Circuit...
  • Page 66 Refrigerant Circuit (Piping Diagrams) SiUS372201EA BSF8Q54TVJ C: 3D125656 Part 2 Refrigerant Circuit...

  • Page 67: Indoor Unit

    SiUS372201EA Refrigerant Circuit (Piping Diagrams) Indoor Unit Symbol No. in Except piping Name Function FXMQ-PB FXTQ-TA FXMQ-PB diagram FXTQ-TA CXTQ-TA CXTQ-TA Electronic expansion valve Used for gas superheating degree control while in cooling or subcooling degree control while in heating. Suction air thermistor R1T (1) Used for thermostat control.
  • Page 68 Refrigerant Circuit (Piping Diagrams) SiUS372201EA  FXSQ-TB, FXMQ-TB  FXUQ-PA C: 4D133246 C: 4D141716  FXDQ-M  FXMQ-PB Gas piping connection port Gas piping connection port Liquid piping connection port Indoor heat exchanger Filter Filter Liquid piping connection port Filter Filter C: 4D034245S Indoor heat exchanger C: 4D043864N  FXTQ-TA  CXTQ-TA...

  • Page 69: Outdoor-Air Processing Unit

    SiUS372201EA Refrigerant Circuit (Piping Diagrams) Outdoor-Air Processing Unit FXMQ48/72/96MFVJU* 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 70: Functional Parts Layout

    Functional Parts Layout SiUS372201EA 2. Functional Parts Layout REYQ72AA Plane View Solenoid valve (Oil separator oil return 1) (Y1S) Low pressure sensor (S1NPL) Front View Fan motor (M1F) Four way valve (HP/LP gas pipe) Four way valve (Y8S) (Heat exchanger right upper) (Y10S) High pressure sensor Four way valve...
  • Page 71 SiUS372201EA Functional Parts Layout Detail of A Thermistor (Heat exchanger Electronic expansion valve right lower gas pipe) (Heat exchanger right lower) (R9T) (Y2E) Electronic expansion valve (Refrigerant cooling air) Thermistor (Heat exchanger (Y7E) right upper gas pipe) (R2T) Electronic expansion valve (Heat exchanger right upper) (Y1E) Solenoid valve...

  • Page 72: Reyq96/120Aa

    Functional Parts Layout SiUS372201EA REYQ96/120AA Plane View Solenoid valve Solenoid valve (Oil separator oil return 2) (Oil separator oil return 1) (Y1S) (Y2S) Low pressure sensor (S1NPL) Front View Fan motor 1 Fan motor 2 (M2F) (M1F) Four way valve Four way valve (Heat exchanger right upper) (Heat exchanger right lower)
  • Page 73 SiUS372201EA Functional Parts Layout Detail of A Thermistor (Heat exchanger Thermistor (Heat exchanger right upper gas pipe) right lower gas pipe) (R2T) (R9T) Thermistor Thermistor (Electrical box air outlet) (Suction pipe before accumulator) (R3T) (R5T) Thermistor (Heat exchanger right upper liquid pipe) Thermistor (Subcooling (R6T) heat exchanger liquid pipe)
  • Page 74 Functional Parts Layout SiUS372201EA Inside Electrical Component Box REYQ96/120AATJA Thermistor (Box air) (R20T) C: 1P645890G REYQ96/120AAYDA Thermistor (Box air) (R20T) C: 1P647827G Part 2 Refrigerant Circuit...

  • Page 75: Reyq144/168Aa

    SiUS372201EA Functional Parts Layout REYQ144/168AA Plane View Solenoid valve Solenoid valve (Oil separator oil return 2) (Oil separator oil return 1) (Y1S) (Y2S) Low pressure sensor (S1NPL) Front View Fan motor 1 Fan motor 2 (M2F) (M1F) Four way valve Four way valve (Heat exchanger right upper) (Heat exchanger right lower)
  • Page 76 Functional Parts Layout SiUS372201EA Detail of A Thermistor (Heat exchanger Thermistor (Heat exchanger right upper gas pipe) right lower gas pipe) (R2T) (R9T) Thermistor Thermistor (Electrical box air outlet) (Suction pipe before accumulator) (R3T) (R5T) Thermistor (Heat exchanger right upper liquid pipe) Thermistor (Subcooling (R6T) heat exchanger liquid pipe)
  • Page 77 SiUS372201EA Functional Parts Layout Inside Electrical Component Box REYQ144/168AATJA Thermistor (Box air) (R20T) C: 1P645889F REYQ144/168AAYDA Thermistor (Box air) (R20T) C: 1P647825G Part 2 Refrigerant Circuit...

  • Page 78: Reyq192/216/240Aa

    Functional Parts Layout SiUS372201EA REYQ192/216/240AA Plane View Solenoid valve (Oil separator oil return 2) (Y1S) Low pressure sensor (S1NPL) Front View Four way valve High pressure sensor (HP/LP gas pipe) Fan motor 1 Fan motor 2 (S1NPH) (Y8S) (M1F) (M2F) Four way valve Thermistor (Outdoor air) (Heat exchanger right lower)
  • Page 79 SiUS372201EA Functional Parts Layout Detail of A Thermistor (Heat exchanger right upper gas pipe) (R2T) Thermistor (Suction pipe before accumulator) Thermistor (R5T) (Heat exchanger right lower gas pipe) (R9T) Thermistor (Electrical box air outlet) Solenoid valve (Oil separator oil return 1) (R3T) (Y2S) Thermistor...
  • Page 80 Functional Parts Layout SiUS372201EA Inside Electrical Component Box REYQ192/216/240AATJA Thermistor (Box air) (R20T) C: 1P645889F REYQ192/216/240AAYDA Thermistor (Box air) (R20T) C: 1P647825G Part 2 Refrigerant Circuit...

  • Page 81: Refrigerant Flow For Each Operation Mode

    SiUS372201EA Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode REYQ72AA Cooling Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T...
  • Page 82 Refrigerant Flow for Each Operation Mode SiUS372201EA Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure Solenoid regulating...
  • Page 83 SiUS372201EA Refrigerant Flow for Each Operation Mode Simultaneous Cooling and Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 84 Refrigerant Flow for Each Operation Mode SiUS372201EA Cooling Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 85 SiUS372201EA Refrigerant Flow for Each Operation Mode Defrost Heating Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 86 Refrigerant Flow for Each Operation Mode SiUS372201EA Oil Return Operation at Simultaneous Cooling and Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T...

  • Page 87: Reyq96/120/144/168Aa

    SiUS372201EA Refrigerant Flow for Each Operation Mode REYQ96/120/144/168AA Cooling Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure Solenoid...
  • Page 88 Refrigerant Flow for Each Operation Mode SiUS372201EA Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure Solenoid Solenoid...
  • Page 89 SiUS372201EA Refrigerant Flow for Each Operation Mode Simultaneous Cooling and Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 90 Refrigerant Flow for Each Operation Mode SiUS372201EA Cooling Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 91 SiUS372201EA Refrigerant Flow for Each Operation Mode Defrost Heating Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 92 Refrigerant Flow for Each Operation Mode SiUS372201EA Oil Return Operation at Simultaneous Cooling and Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T...

  • Page 93: Reyq192/216/240Aa

    SiUS372201EA Refrigerant Flow for Each Operation Mode REYQ192/216/240AA Cooling Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure Solenoid...
  • Page 94 Refrigerant Flow for Each Operation Mode SiUS372201EA Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure Solenoid Solenoid...
  • Page 95 SiUS372201EA Refrigerant Flow for Each Operation Mode Simultaneous Cooling and Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 96 Refrigerant Flow for Each Operation Mode SiUS372201EA Cooling Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 97 SiUS372201EA Refrigerant Flow for Each Operation Mode Defrost Heating Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T Filter Pressure...
  • Page 98 Refrigerant Flow for Each Operation Mode SiUS372201EA Oil Return Operation at Simultaneous Cooling and Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid Stop valve(With service φ5/16in.(7.9mm)flare connection) Check valve Check valve R11T...
  • Page 99 SiUS372201EA Part 3 Remote Controller 1. Applicable Models ..................93 2. Names and Functions ................94 2.1 BRC1E73 ....................94 2.2 BRC1H71W....................97 2.3 Wireless Remote Controller ..............105 3. Main/Sub Setting..................106 3.1 BRC1E73 ....................106 3.2 BRC1H71W....................108 3.3 When Wireless Remote Controller is Used Together....... 110 4.

  • Page 100: Applicable Models

    Applicable Models SiUS372201EA 1. Applicable Models Wired remote controller Series Wireless remote controller Navigation Madoka FXFQ-T — BRC082A42W (for BYFQ60C3W1W) FXZQ-TA BRC082A42S (for BYFQ60C3W1S) BRC082A41W (for BYFQ60B3W1) BRC082A42W (for BYFQ60C3W2W) FXZQ-TB BRC082A41W (for BYFQ60B3W1) FXUQ-P FXUQ-PA — FXEQ-P FXDQ-M BRC4C82 FXSQ-TA BRC082A43 FXSQ-TB...

  • Page 101: Names And Functions

    SiUS372201EA Names and Functions 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 102 Names and Functions SiUS372201EA 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 103 SiUS372201EA Names and Functions 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 104: Brc1H71W

    Names and Functions SiUS372201EA 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 105 SiUS372201EA Names and Functions 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 106 Names and Functions SiUS372201EA 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 107 SiUS372201EA Names and Functions 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 108 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 109 SiUS372201EA Names and Functions 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 110 Names and Functions SiUS372201EA 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 111 * 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 112: Wireless Remote Controller

    Names and Functions SiUS372201EA 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 113: Main/Sub Setting

    SiUS372201EA Main/Sub Setting 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 114 Main/Sub Setting SiUS372201EA 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 115: Brc1H71W

    SiUS372201EA Main/Sub Setting 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 116 Main/Sub Setting SiUS372201EA 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 117: When Wireless Remote Controller Is Used Together

    SiUS372201EA Main/Sub Setting 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 118: Address Setting For Wireless Remote Controller

    Address Setting for Wireless Remote Controller SiUS372201EA 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 119 SiUS372201EA Address Setting for Wireless Remote Controller 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 120: Centralized Control Group No. Setting

    Centralized Control Group No. Setting SiUS372201EA 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 121 SiUS372201EA Centralized Control Group No. Setting 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 122: Brc1H71W

    Centralized Control Group No. Setting SiUS372201EA 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 123: Group No. Setting Example

    SiUS372201EA Centralized Control Group No. Setting 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 Central Remote Controller Indoor/Outdoor Outdoor/Outdoor Indoor/Outdoor Outdoor/Outdoor F1 F2...

  • Page 124: Service Settings Menu, Maintenance Menu

    Service Settings Menu, Maintenance Menu SiUS372201EA 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 125 SiUS372201EA Service Settings Menu, Maintenance Menu 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 126 Service Settings Menu, Maintenance Menu SiUS372201EA 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 127 SiUS372201EA Service Settings Menu, Maintenance Menu Maintenance Menu Item 2 Remarks Error Display Display error ON Displays the error on the screen. Display error OFF Displays neither errors nor warnings. Display warning ON Displays a warning on the screen if an error occurs. Display warning OFF No warning is displayed.

  • Page 128: Administrator Menu, Installer Menu

    Administrator Menu, Installer Menu SiUS372201EA 7. Administrator Menu, Installer Menu BRC1H71W Refer to page 99 for details. Part 3 Remote Controller...
  • Page 129 SiUS372201EA Part 4 Functions and Control 1. Operation Flowchart................124 2. Stop Control ....................125 2.1 Stop due to Error ..................125 2.2 When System is in Stop Control............... 125 2.3 Sub Unit Stops during Master Unit Control ..........125 3. Standby Control ..................126 3.1 Restart Standby..................
  • Page 130 SiUS372201EA 9.5 Drain Pump Control.................. 168 9.6 Control of Electronic Expansion Valve ............. 170 9.7 Freeze-Up Prevention Control..............171 9.8 List of Swing Flap Operations ..............173 9.9 Hot Start Control (In Heating Operation Only).......... 174 9.10 Louver Control for Preventing Ceiling Dirt..........175 9.11 Heater Control (Except FXTQ-TA Models)..........

  • Page 131: Operation Flowchart

    SiUS372201EA Operation Flowchart 1. Operation Flowchart For detailed description of each function in the flow below, refer to the details on related function on the following pages. Stop control (1) Stop due to error (2) When system is in stop control (3) Sub unit stops during master unit control Special control Standby control...

  • Page 132: Stop Control

    Stop Control SiUS372201EA 2. Stop Control Stop due to Error In order to protect compressors, if any of the abnormal state occurs, the system will stop with thermostat OFF and the error will be determined when the retry times reaches certain number. (Refer to Error Codes and Descriptions on page 275 of the troubleshooting for the items to determine the error.) When System is in Stop Control...

  • Page 133: Standby Control

    SiUS372201EA Standby Control 3. Standby Control Restart Standby Used to forcedly stop the compressor for a period of 2 minutes, in order to prevent the frequent ON/OFF of the compressor and equalize the pressure within the refrigerant system. In addition, the outdoor fan carry out the residual operation for a while to accelerate pressure equalizing and to suppress migration of the refrigerant to the evaporator.

  • Page 134: Startup Control

    Startup Control SiUS372201EA 4. Startup Control This control is used to equalize the pressure in the suction and discharge sides of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. To avoid stresses to the compressor due to liquid refrigerant return or else after the startup, the following control is made and the position of the four way valve is also determined.

  • Page 135: Startup Control In Cooling

    SiUS372201EA Startup Control Startup Control in Cooling Rotation speed step up 5 sec. interval 0 rps Compressor motor (M1C) (M2C) 3,000 pulse (fully open) 0 pulse Electronic expansion valve (main) Ta < 20°C: OFF (Y1E) (Y2E) (Y3E) (68°F) Ta ≥ 20°C: StepX/2 +3step/15 sec.

  • Page 136: Basic Control

    Basic Control SiUS372201EA 5. Basic Control Normal Control Function Part name Electric symbol Normal simultaneous Normal cooling Normal heating cooling/heating Compressor motor PI control, High pressure PI control, High pressure PI control, High pressure protection, Low pressure protection, Low pressure protection, Low pressure M1C, M2C protection,...

  • Page 137: Compressor Pi Control

    SiUS372201EA Basic Control Normal simultaneous cooling/heating Branch Selector unit actuator Normal cooling Normal heating Cooling Heating Subcooling degree Thermostat ON 0 pulse 0 pulse 0 pulse Electronic control expansion Non-operating 0 pulse 0 pulse 0 pulse 0 pulse valve (EVSC) Thermostat OFF 0 pulse 0 pulse...

  • Page 138: Compressor Step Control

    Basic Control SiUS372201EA Compressor Step Control The compressor operation varies in the following steps according to information in Compressor PI Control on page 130. Depending on the operating conditions of compressors, the compressors may run in patterns other than the following. REYQ72AA Step Step...
  • Page 139 SiUS372201EA Basic Control REYQ96/120AA Step Step up (rps) Step down (rps) Step Step up (rps) Step down (rps) Step Step up (rps) Step down (rps) 15.0 29.7 47.6 22.5 25.1 135.2 63.9 71.3 15.3 29.7 48.3 22.8 25.5 137.1 64.8 72.3 15.7 29.7...
  • Page 140 Basic Control SiUS372201EA REYQ144/168AA Step Step up (rps) Step down (rps) Step Step up (rps) Step down (rps) Step Step up (rps) Step down (rps) 15.0 15.0 48.9 19.1 18.5 58.8 53.8 58.8 53.8 15.3 15.3 49.6 19.5 18.8 59.6 54.6 59.6 54.6...
  • Page 141 SiUS372201EA Basic Control REYQ192/216/240AA Step Step up (rps) Step down (rps) Step Step up (rps) Step down (rps) Step Step up (rps) Step down (rps) 15.0 15.0 43.0 19.0 24.0 122.2 58.5 63.6 15.2 15.2 43.6 19.2 24.4 123.9 59.4 64.4 15.4 15.4...

  • Page 142: Electronic Expansion Valve Pi Control

    Basic Control SiUS372201EA Electronic Expansion Valve PI Control Main electronic expansion valve EVM control When the outdoor unit heat exchanging is performed via the condenser (Y7S, Y9S or Y10S is set to OFF), this function is used to exert PI control on the electronic expansion valve (Y1E, Y2E or Y5E) so that the condenser outlet subcooling degree (SC) will become constant.

  • Page 143: Step Control Of Outdoor Fans

    SiUS372201EA Basic Control Step Control of Outdoor Fans Used to control the revolutions of outdoor fans in the steps listed in table below, according to condition changes. REYQ72AA REYQ96/120AA Heating/ Standard (default) Standard (default) Step X Cooling Step Step Simultaneous Cooling Heating Cooling...
  • Page 144 Basic Control SiUS372201EA REYQ144/168AA REYQ192AA REYQ216/240AA Standard (default) Standard (default) Standard (default) Step Step Step Cooling Heating Cooling Heating Cooling Heating 1,004 1,004 1,027 1,027 1,025 1,025 1,072 1,072 1,121 1,147 ←REYQ144AA Heating upper limit 1,171 1,021 1,201 1,051 ←REYQ168AA Heating upper limit 1,224 1,074 1,201...

  • Page 145: Heat Exchanger Control

    SiUS372201EA Basic Control Heat Exchanger Control While in heating or cool/heat simultaneous operation, ensure target condensing and evaporating temperature by changing over the air heat exchange of outdoor unit to the evaporator or the condenser in response to loads. Single system Outdoor unit Outdoor unit Upper side (Right)

  • Page 146: Protection Control

    Protection Control SiUS372201EA 6. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure.
  • Page 147 SiUS372201EA Protection Control Heating Normal control < 3.17 MPa > 3.31 MPa (460 psi) (480 psi) Pc: High pressure sensor detection value for master > 3.39 MPa unit (492 psi) All units Compressor step: 1 9-step down After 10 After 10 seconds >...

  • Page 148: Low Pressure Protection Control

    Protection Control SiUS372201EA Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. Cooling Normal control Pe < 0.25 MPa Pe > 0.39 MPa (36.3 psi) (56.6 psi) Pe: Low pressure sensor detection value for master unit All compressors step: 1...

  • Page 149: Discharge Pipe Protection Control

    SiUS372201EA Protection Control Discharge Pipe Protection Control This discharge pipe 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 : Compressor body temperature : Maximum of HTdi and Ti X (°C)(Y (°F))

  • Page 150: Inverter Protection Control

    Protection Control SiUS372201EA Inverter Protection Control Inverter current protection control and radiation fin temperature control are performed to prevent tripping due to an abnormality, or transient inverter overcurrent, and fin temperature increase. In the case of multi-outdoor-unit system, each compressor performs these controls in the following sequence.
  • Page 151 SiUS372201EA Protection Control Radiation fin temperature control Perform the following control of integrated as well as multi units for each compressor. Normal operation Reduce compressor capacity When occurring 4 times within 60 Fin temperature standby minutes, the error code L4 is output. REYQ96/120AATJA REYQ144/168AATJA REYQ192/216/240AATJA...

  • Page 152: Special Control

    Special Control SiUS372201EA 7. Special Control Pump Down Residual Operation Pc : High pressure sensor detection value Pe : Low pressure sensor detection value Ta : Outdoor air temperature Te : Low pressure equivalent saturation temperature DSH : Discharge pipe superheating degree If the liquid refrigerant stays in the evaporator at the startup of a compressor, this liquid refrigerant enters the compressor, thus resulting in diluted oil in the compressor and then degraded lubrication performance.

  • Page 153: Oil Return Operation

    SiUS372201EA Special Control Oil Return Operation In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil that has flowed out from the compressor to the system side. Tc: High pressure equivalent saturation temperature Te: Low pressure equivalent saturation temperature TsA: Suction pipe temperature detected by thermistor R5T 7.2.1 Oil Return Operation in Cooling Operation...
  • Page 154 Special Control SiUS372201EA Indoor unit actuator Oil return operation Thermostat ON unit Remote controller setting Non-operating unit Thermostat OFF unit Remote controller setting Thermostat ON unit Normal control Electronic expansion valve Non-operating unit 224 pulse Thermostat OFF unit Forced thermostat ON (PI control) Branch Selector unit actuator Normal cooling Thermostat ON...
  • Page 155 SiUS372201EA Special Control 7.2.2 Oil Return Operation in Heating Operation Part name Electric symbol Function of functional part Compressor motor M1C, M2C Constant high pressure control Fan motor M1F, M2F For heat exchanger mode Electronic expansion valve (Heat exchanger right upper) Same as normal control Electronic expansion valve (Heat exchanger right lower) Electronic expansion valve (Heat exchanger left)

  • Page 156: Defrost Operation

    Special Control SiUS372201EA Defrost Operation To defrost the outdoor heat exchanger while in Evaporator, the defrost operation is conducted to recover the heating capacity. Tb: Heat exchanger deicer temperature REYQ72-168AA single system and REYQ192-240AA single system when outside temperature is lower than 0°C (32°F) Part name Electric symbol...
  • Page 157 SiUS372201EA Special Control REYQ192-240AA single system when outside temperature is higher than 0°C (32°F) Part name Electric symbol Function of functional part Compressor motor M1C, M2C 135.0 rps + 140.0 rps Fan motor (Defrosting side) With high pressure OFF ↔ Step X/2 ↔ Step X M1F, M2F (Evaporating side) MAX Step...
  • Page 158 Special Control SiUS372201EA Multi system Function of functional part Electric Part name symbol Defrosting unit Evaporator unit Compressor motor REYQ72AA: 127.3 rps REYQ96/120AA: 125.4 rps + 140.0 rps M1C, M2C REYQ144/168AA: 85.2 rps + 114.9 rps REYQ192/216/240AA: 135.0 rps + 140.0 rps Fan motor With high pressure MAX Step...

  • Page 159: Outdoor Unit Rotation

    SiUS372201EA Special Control Outdoor Unit Rotation In the case of multi outdoor unit system, this outdoor unit rotation prevents the compressor from breaking down due to unbalanced oil level between outdoor units. Details of outdoor unit rotation In the case of multi outdoor unit system, each outdoor unit is given an operating priority for the control.

  • Page 160: Cooling/Heating Mode Switching

    Special Control SiUS372201EA Cooling/Heating Mode Switching While in cooling/heating mixed mode, single-room cooling → heating First, the electronic expansion valve of the indoor unit in cooling operation will close, and the Y2E and Y3E electronic expansion valves of the branch selector unit will all close once. Next, the Y2E electronic expansion valve will open little by little to perform pressure equalization.
  • Page 161 SiUS372201EA Special Control While in cooling/heating mixed mode, single-room heating → cooling First, the electronic expansion valve of the indoor unit in heating operation will close, and the Y2E and Y3E electronic expansion valves of the branch selector unit will all close once. Next, the Y3E electronic expansion valve will open little by little to perform pressure equalization.
  • Page 162 Special Control SiUS372201EA While in all-room cooling operation → All-room cooling/heating simultaneous operation (1) All the indoor units in cooling operation Dual pressure gas pipe  Using the dual pressure gas pipe as a suction gas Suction gas pipe pipe. Liquid (2) Pump-down residual operation pipe...

  • Page 163: Other Control

    SiUS372201EA Other Control 8. Other Control Backup Operation If any of the compressors goes wrong, disable the relevant compressor or the relevant outdoor unit from operating, and then conduct emergency operation only with operational compressors or outdoor units. "Emergency operation with remote controller reset" and "Emergency operation with outdoor unit PCB setting"...

  • Page 164: Outline Of Control (Indoor Unit)

    Outline of Control (Indoor Unit) SiUS372201EA 9. 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 165 SiUS372201EA Outline of Control (Indoor Unit) ∗10 Program dry operation Fan Operation Program ∗8 Drain dry display : OFF pump kit (Option) ∗9 Aux. ∗4 : OFF electric heater Thermostat status (Option) Humidifier : OFF : Operating in L mode after it stops for 6 min. Operating in L mode Electronic YE :...
  • Page 166 Outline of Control (Indoor Unit) SiUS372201EA 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 167 SiUS372201EA Outline of Control (Indoor Unit) prevention operation will be conducted. If the evaporator inlet temperature is kept at not less than 7°C (44.6°F) for a consecutive period of 10 min., the freeze-up prevention operation will be reset. 6. Thermostat status Set temperature a = b = 1°C (1.8°F) or 0.5°C (0.9°F) The values a and b depend on the field setting 12(22)-2.

  • Page 168: Set Temperature And Control Target Temperature

    Outline of Control (Indoor Unit) SiUS372201EA Set Temperature and Control Target Temperature 9.2.1 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 169 SiUS372201EA Outline of Control (Indoor Unit) 9.2.2 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 170: Remote Controller Thermistor

    Outline of Control (Indoor Unit) SiUS372201EA 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 171 SiUS372201EA Outline of Control (Indoor Unit)  Assuming suction temperature has changed from 30°C (86°F) to 18°C (64°F) (F A): Suction air thermistor is used for temperatures from 30C (86F) to 25C (77F) (F  D). Remote controller thermistor is used for temperatures from 25C (77F) to 21C (70F) (D B). Suction air thermistor is used for temperatures from 21C (70F) to 18C (64F) (B...

  • Page 172: Thermostat Control

    Outline of Control (Indoor Unit) SiUS372201EA Thermostat Control The thermostat ON/OFF differential value (factory setting) differs depending on the models. Differential value Model 1°C (1.8°F) FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXSQ-TA, FXHQ-M, FXTQ-TA FXZQ-TB, FXUQ-PA, FXDQ-M, FXSQ-TB, FXMQ-PB, FXMQ-TB, FXMQ-M, 0.5°C (0.9°F) FXAQ-P, FXLQ-M, FXNQ-M, FXMQ-MF, CXTQ-TA 9.4.1 Without Infrared Floor Sensor Whether the thermostat is turned ON or OFF is determined by the difference between the remote...
  • Page 173 SiUS372201EA Outline of Control (Indoor Unit) 9.4.2 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 174 Outline of Control (Indoor Unit) SiUS372201EA 9.4.3 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 175: Drain Pump Control

    SiUS372201EA Outline of Control (Indoor Unit) Drain Pump Control 9.5.1 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 176 Outline of Control (Indoor Unit) SiUS372201EA 9.5.3 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 177: Control Of Electronic Expansion Valve

    SiUS372201EA Outline of Control (Indoor Unit) Control of Electronic Expansion Valve Electronic expansion valves in indoor units have the functions of conducting superheating degree control in cooling operation and subcooling degree control in heating operation. However, if the indoor units receive any control command such as a protection control command or a special control command from the outdoor unit, the units will give a priority to the control command.

  • Page 178: Freeze-Up Prevention Control

    Outline of Control (Indoor Unit) SiUS372201EA Freeze-Up Prevention Control 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 179 SiUS372201EA Outline of Control (Indoor Unit) Note(s) When the indoor unit is FXFQ-T, FXZQ-TA, FXZQ-TB, 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 180: List Of Swing Flap Operations

    Outline of Control (Indoor Unit) SiUS372201EA List of Swing Flap Operations Swing flaps operate as shown in table below. Flap FXZQ-TA FXZQ-TB FXFQ-T FXEQ-P FXHQ-M FXUQ-P FXUQ-PA FXAQ-P Hot start from defrost Swing Horizontal Horizontal Horizontal Horizontal operation Airflow direction set Horizontal Horizontal Horizontal...

  • Page 181: Hot Start Control (In Heating Operation Only)

    SiUS372201EA Outline of Control (Indoor Unit) Hot Start Control (In Heating Operation Only) At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor fan is controlled to prevent cold air from blasting out and ensure startup capacity. TH2: Temperature detected with the gas thermistor Tc : High pressure equivalent saturated temperature Starting condition...

  • Page 182: Louver Control For Preventing Ceiling Dirt

    Outline of Control (Indoor Unit) SiUS372201EA 9.10 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 183: Heater Control (Except Fxtq-Ta Models)

    SiUS372201EA Outline of Control (Indoor Unit) 9.11 Heater Control (Except FXTQ-TA Models) Note(s) Optional PCB KRP1B... is required. The heater control is conducted in the following manner. Normal control While in heating, the heater control (ON/OFF) is conducted as shown below. Set temperature 2˚C 2˚C...

  • Page 184: Heater Control (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS372201EA 9.12 Heater Control (FXTQ-TA Models) Note(s) Optional heater kit HKS... is required. For FXTQ-TA models, heater ON/OFF output from wiring adaptor interlocks with the operation of heater kit HKS….(When the heater 1 turns ON/OFF, heater output of wiring adaptor turns ON/OFF.) Fan residual operation also interlocks with the fan residual operation of heater kit HKS….
  • Page 185 SiUS372201EA Outline of Control (Indoor Unit) Condition A • No fan motor system error • High pressure condition: ON (∗1) • Liquid pipe temperature condition: ON (∗2) • Heater ON permission (Defrost/oil Return): 0 (∗4) & & • Not during defrost/oil return •...
  • Page 186 Outline of Control (Indoor Unit) SiUS372201EA 9.12.2 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 187: Gas Furnace Control (Cxtq-Ta Models)

    SiUS372201EA Outline of Control (Indoor Unit) 9.13 Gas Furnace Control (CXTQ-TA Models) Outline When conditions for gas furnace operation are established, the system transits into gas furnace operation, CXTQ-TA requires the gas furnace combustion heating. Detail • Thermostat: ON • Thermostat: OFF Thermostat OFF Thermostat ON •...

  • Page 188: 3-Step Thermostat Processing (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS372201EA 9.14 3-Step Thermostat Processing (FXTQ-TA Models) Outline The thermostat ON/OFF for the indoor unit is controlled in accordance with Thermostat step 1. The heater ON/OFF operation during heating is controlled as follows. Thermostat step 2, 3: Auxiliary electric heater control Thermostat step 1, 2: Heat pump lockout control For more details of the heater, refer to Heater Control (FXTQ-TA Models) on page 177.

  • Page 189: Fan Control (Heater Residual) (Fxtq-Ta Models)

    SiUS372201EA Outline of Control (Indoor Unit) 9.15 Fan Control (Heater Residual) (FXTQ-TA Models) Outline If the indoor heater turned OFF from ON during heating operation, the fan will keep operating for further period of time in order to cool the heater. Detail Residual ON •...
  • Page 190 Outline of Control (Indoor Unit) SiUS372201EA 9.16.3 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 191 SiUS372201EA Part 5 Field Settings and Test Operation 1. Field Settings for Indoor Unit..............185 1.1 Field Settings with Remote Controller ............185 1.2 List of Field Settings for Indoor Unit ............191 1.3 Applicable Field Settings ................193 1.4 Details of Field Settings for Indoor Unit............ 197 1.5 Gas Furnace Set Up.................

  • Page 192: Field Settings For Indoor Unit

    Field Settings for Indoor Unit SiUS372201EA 1. Field Settings for Indoor Unit Field Settings with 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 193 SiUS372201EA Field Settings for Indoor Unit 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 194 Field Settings for Indoor Unit SiUS372201EA 1.1.2 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.
  • Page 195 SiUS372201EA Field Settings for Indoor Unit 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 196 Field Settings for Indoor Unit SiUS372201EA 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 197 SiUS372201EA Field Settings for Indoor Unit 1.1.3 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: ...

  • Page 198: List Of Field Settings For Indoor Unit

    Field Settings for Indoor Unit SiUS372201EA List of Field Settings for Indoor Unit : Factory setting First Second Code No. Mode Reference Code Setting Contents Page (Note 2) Filter Ultra long life Approx. Approx. cleaning filter 10,000 5,000 sign hrs. hrs.
  • Page 199 SiUS372201EA Field Settings for Indoor Unit First Second Code No. Mode Reference Code Setting Contents Page (Note 2) Setting of airflow rate Standard High ceiling 1 High ceiling 2 — Airflow direction setting 4-direction 2-direction 3-direction airflow — airflow airflow Swing pattern settings All direction Facing...

  • Page 200: Applicable Field Settings

    Field Settings for Indoor Unit SiUS372201EA Applicable Field Settings First Field Code Setting Modes setting Filter cleaning sign interval Filter sign setting — — — — — — — Filter type — — — Filter cleaning sign interval — — —...
  • Page 201 SiUS372201EA Field Settings for Indoor Unit First Field Code Setting Modes setting Setting of airflow rate — — — Airflow direction setting — — — — Swing pattern settings — — — — Setting of airflow direction — — — 13 (23) adjustment range Setting of static pressure...
  • Page 202 Field Settings for Indoor Unit SiUS372201EA First Field Code Setting Modes setting Filter cleaning sign interval — — Filter sign setting — — — — — — Filter type — — — — — — Filter cleaning sign interval — —...
  • Page 203 SiUS372201EA Field Settings for Indoor Unit First Field Code Setting Modes setting Drain pump operation — — — — — — — — settings Humidification when heating thermostat is OFF Setting of direct duct — — — — — — —...

  • Page 204: Details Of Field Settings For Indoor Unit

    Field Settings for Indoor Unit SiUS372201EA Details of Field Settings for Indoor Unit 1.4.1 Filter Cleaning Sign Interval, Filter Type : Factory setting 10 (20)-1 01: Long life filter 02: Ultra long life filter Setting Filter contamination heavy/light Light Heavy Light Heavy 10 (20)-0...
  • Page 205 SiUS372201EA Field Settings for Indoor Unit 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 206 Field Settings for Indoor Unit SiUS372201EA To use the remote controller thermistor control during group control, select the Second code No. 02 in First code No. 6. : Factory setting Mode First Code Second Code Contents Remote controller thermistor control is not permitted 01...
  • Page 207 SiUS372201EA Field Settings for Indoor Unit 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 208 Field Settings for Indoor Unit SiUS372201EA 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 209 SiUS372201EA Field Settings for Indoor Unit 1.4.8 Electric Heater Setting (for FXTQ-TA models) : Factory setting Contents Second Code Mode No. First Code No. Electric heater run for Heater operation defrost/oil return operation Electric heater with heat 01 Not allowed pump not allowed...
  • Page 210 Field Settings for Indoor Unit SiUS372201EA 1.4.10 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 211 SiUS372201EA Field Settings for Indoor Unit 2. If the air passageway including duct or blow-off ports is changed after automatic adjustment, make sure to perform automatic airflow adjustment again. 1.4.12 Compensating the Temperature around People (For units with the infrared floor sensor only) Change the ratio between the suction air temperature and floor temperature used to calculate the temperature around human.
  • Page 212 Field Settings for Indoor Unit SiUS372201EA 1.4.14 Dry Mode Set Temperature (for FXZQ-TB, FXUQ-PA, FXSQ-TB, and FXMQ-TB models) : Factory setting Mode No. First Code No. Second Code No. Contents 01 Room temperature 11 (21) Same as cooling mode set temperature 1.4.15 Optional Output Switching Using this setting, "operation output signal"...
  • Page 213 SiUS372201EA Field Settings for Indoor Unit 1.4.17 Thermostat Switching Differential value during thermostat ON/OFF control can be changed. Mode No. First Code No. Second Code No. Contents 1°C (1.8°F) 12 (22) 0.5°C (0.9°F) Factory Setting Model Second Code No. Contents FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXSQ-TA, FXHQ-M, 1°C (1.8°F) FXTQ-TA...
  • Page 214 Field Settings for Indoor Unit SiUS372201EA Due to the aforementioned, when the "Auto restart after power failure” setting is ON, be careful for the following situations that may occur. 1. The air conditioner will start operation suddenly after power failure, Caution or when the main power supply is restored.
  • Page 215 SiUS372201EA Field Settings for Indoor Unit FXZQ-TA, FXZQ-TB, FXEQ-P : Factory setting Mode First Code Second Contents Ceiling height Code No. 01 Standard Lower than 2.7 m (8-3/4 ft) 13 (23) High Ceiling 1 Lower than 3.0 m (10 ft) Higher Ceiling 2 Lower than 3.5 m (11-1/2 ft) FXHQ-M, FXAQ-P...
  • Page 216 Field Settings for Indoor Unit SiUS372201EA 1.4.26 Setting of Static Pressure Selection (for FXDQ-M models) : Factory setting Mode No. First Code No. Second Code No. Contents Standard (FXDQ07-12M: 10 Pa (0.04 inWG), 01 FXDQ18/24M: 30 Pa (0.12 inWG)) 13 (23) High static pressure (FXDQ07-12M: 15 Pa (0.06 inWG), FXDQ18/24M: 45 Pa (0.18 inWG)) 1.4.27 External Static Pressure Settings...
  • Page 217 SiUS372201EA Field Settings for Indoor Unit FXMQ-TB models : Factory setting Mode No. First Code No. Second Code No. Contents 50 Pa (0.20 inWG) 60 Pa (0.24 inWG) 70 Pa (0.28 inWG) 80 Pa (0.32 inWG) 90 Pa (0.36 inWG) 07...
  • Page 218 Field Settings for Indoor Unit SiUS372201EA 1.4.30 Mold Proof Operation Setting (for FXEQ-P models) : Factory setting Mode First Code Second Code Contents — 14 (24) 02 Standard For high humidity areas () Areas with average humidity over 80%. 1.4.31 Gas Furnace Test Mode (for CXTQ-TA models) This setting is used for gas furnace test run.
  • Page 219 SiUS372201EA Field Settings for Indoor Unit 1.4.35 Interlocked Operation between Humidifier and Drain Pump This is used to interlock the humidifier with the drain pump. When water is drained out of the unit, this setting is unnecessary. : Factory setting Mode First Code Second Code...
  • Page 220 Field Settings for Indoor Unit SiUS372201EA 1.4.40 Access Permission Level Setting  For BRC1E73 only There are 2 levels as follows:  Level 2: The following buttons are selectable to be disable or enable.  Level 3: No buttons are selectable and only On/Off button is available. Button Level 2 Level 3...

  • Page 221: Gas Furnace Set Up

    SiUS372201EA Field Settings for Indoor Unit 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 222: List Of Field Settings For Outdoor-Air Processing Unit

    Field Settings for Indoor Unit SiUS372201EA 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 223 SiUS372201EA Field Settings for Indoor Unit 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 224: Field Setting From Outdoor Unit

    Field Setting from Outdoor Unit SiUS372201EA 2. Field Setting from Outdoor Unit To continue the configuration of the VRV heat recovery system, it is required to give some input to the PCB of the unit. This chapter will describe how manual input is possible by operating the BS buttons/DIP switches on the PCB and reading the feedback from the 7 segment displays.
  • Page 225 SiUS372201EA Field Setting from Outdoor Unit (1) Microcomputer normal monitor This monitor blinks while in normal control, and turns ON or OFF when an error occurs. (2) Segment display Used to check the transmission and display the transmission state between indoor and outdoor units, the contents of error, and the contents of field setting.

  • Page 226: Accessing The Bs Buttons On The Pcb

    Field Setting from Outdoor Unit SiUS372201EA Accessing the BS Buttons on the PCB It is not required to open the complete electronic component box to access the BS buttons on the PCB and read out the seven-segment display(s). 1. Open the service window cover. 2.

  • Page 227: Operating The Bs Buttons And Dip Switches On The Pcb

    SiUS372201EA Field Setting from Outdoor Unit Operating the BS Buttons and DIP Switches on the PCB Operating the BS buttons By operating the BS buttons it is possible to:  Perform special actions (test operation, etc.).  Perform field settings (demand operation, low noise, etc.). Below procedure explains how to operate the BS buttons to reach the required mode in the menu, select the correct setting and modify the value of the setting.
  • Page 228 Field Setting from Outdoor Unit SiUS372201EA Accessing modes The MODE (BS1) button is used to change the mode you want to access.  Access mode 1 Press the MODE (BS1) button once. Segment indication changes to:  Access mode 2 Press the MODE (BS1) button for at least 5 seconds.
  • Page 229 SiUS372201EA Field Setting from Outdoor Unit Mode 2 Mode 2 is used to set field settings of the outdoor unit and system.  Changing and access the setting in mode 2: Once mode 2 is selected (press the MODE (BS1) button for more than 5 seconds), you can select the wanted setting.

  • Page 230: Connecting The Pc Configurator To The Outdoor Unit

    Field Setting from Outdoor Unit SiUS372201EA Connecting the PC Configurator to the Outdoor Unit Connection of the optional PC configurator cable to the outdoor unit has to be done on A1P. Connect the optional cable to the 8-pin white connector X27A. Caution Works executed on the outdoor unit are best done under dry weather conditions to avoid water ingress.
  • Page 231 SiUS372201EA Field Setting from Outdoor Unit [1-1]: shows the status of night-time low noise operation.  0: unit is currently not operating under low noise restrictions  1: unit is currently operating under low noise restrictions Night-time low noise operation reduces the sound generated by the unit compared to nominal operating conditions.
  • Page 232 Field Setting from Outdoor Unit SiUS372201EA [1-35]: shows the latest prediction code. [1-36]: shows the 2nd last prediction code. [1-37]: shows the 3rd last prediction code. [1-40]: shows the current cooling comfort setting. [1-41]: shows the current heating comfort setting. [1-42]: shows the current high pressure sensor value (psi).
  • Page 233 SiUS372201EA Field Setting from Outdoor Unit 2.5.2 Overview of Setting Mode (Mode 2) This overview shows the available settings by using the press buttons on the outdoor unit PCB. 7 segment 7 segment display display Item Description Description Range 1 COOL/HEAT Several systems as 1 zone change Individual...
  • Page 234 Field Setting from Outdoor Unit SiUS372201EA 7 segment 7 segment display display Item Description Description Range 1 External low Low noise level when the external Level 1 noise level low noise signal is input at option Level 2 DTA104A61. Level 3 Automatic night- Time to start automatic “night-time About 8:00 PM...
  • Page 235 SiUS372201EA Field Setting from Outdoor Unit 7 segment 7 segment display display Item Description Description Range 1 Indoor fan tap Indoor fan speed is limited to L tap Indoor capacity ≥ 130% setting depending on connection capacity Indoor capacity ≥ 130% in and outdoor air temperature (Ta).
  • Page 236 Field Setting from Outdoor Unit SiUS372201EA 7 segment 7 segment display display Item Description Description Range 1 Te setting (Heat Used to make setting of targeted Auto recovery evaporating temperature for heat 6°C (42.8°F) operation) recovery operation. 7°C (44.6°F) 8°C (46.4°F) 9°C (48.2°F) 10°C (50.0°F) 11°C (51.8°F)
  • Page 237 SiUS372201EA Field Setting from Outdoor Unit 7 segment 7 segment display display Item Description Description Range 1 Te target Used to make setting of targeted temperature evaporating temperature upper upper limit limit for cooling and heat recovery operation. Auxiliary heater Auxiliary heater is allowed to –17.7°C (0°F) maximum...
  • Page 238 Field Setting from Outdoor Unit SiUS372201EA 2.5.3 Details of Setting Mode 2 Mode 2 is used to change the field settings of the system. Consulting the current field setting value and changing the current field setting value is possible. In general, normal operation can be resumed without special intervention after changing field settings.
  • Page 239 SiUS372201EA Field Setting from Outdoor Unit [2-7]: Eco level setting for Eco mode via External control adaptor. Eco mode can be activated by short circuit the terminal on External control adaptor (Optional) according to [2-7] setting. ([2-64] should be “0”) This unit can operate with “Te or Tc fix control”...
  • Page 240 [2-19] 0 (default) OFF (Normal installation) ON (Single module to dual module installation) Conditions/rules apply for this setting. Refer to selection software or contact your Daikin sales representative for further details. [2-20]: Additional refrigerant charge or wrong wiring automatic detection In order to add the additional refrigerant charge amount following setting should be applied.
  • Page 241 SiUS372201EA Field Setting from Outdoor Unit To activate wrong wiring automatic detection, change [2-20] to 2. To stop the wrong wiring automatic detection, push RETURN (BS3). If this function was not aborted by pushing RETURN (BS3), the unit will stop its operation after 30-90 minutes.
  • Page 242 Field Setting from Outdoor Unit SiUS372201EA [2-21]: Refrigerant recovery/vacuuming mode In order to achieve a free pathway to recovering refrigerant out of the system or to remove residual substances or to vacuum the system it is necessary to apply a setting which will open required valves in the refrigerant circuit so the recovering of refrigerant or vacuuming process can be done properly.
  • Page 243 SiUS372201EA Field Setting from Outdoor Unit [2-28]: Power transistor check mode To evaluate the output of the power transistors. Use this function in case error code is displayed related to defective inverter PCB or compressor is locked. Default value: 0. Power transistor check mode is not active. Field setting 1: Power transistor check mode is active.
  • Page 244 Field Setting from Outdoor Unit SiUS372201EA Next time graph shows the different steps during the power transistor check mode.  Switching sequence during power transistor check mode: Power transistor check mode REYQ-AA Disconnect fasten U/V/W from compressor! Check 4 Voltage Step 1: Step 2: Magnet...
  • Page 245 SiUS372201EA Field Setting from Outdoor Unit [2-29]: Intermittent fan operation Used for intermittent fan operation to assist snow discharge on outdoor fan. Default value: 0. Value Intermittent fan operation [2-29] 0 (default) 30 minutes OFF, 1 minute ON with medium fan speed 30 minutes OFF, 1 minute ON with high fan speed 15 minutes OFF, 1 minute ON with medium fan speed 15 minutes OFF, 1 minute ON with high fan speed...
  • Page 246 Field Setting from Outdoor Unit SiUS372201EA [2-32]: Forced, all time, power consumption limitation operation (no external control adaptor is required to perform power consumption limitation) If the system always needs to run under power consumption limitation conditions, this setting activates and defines the level power consumption limitation that will be applied continuously.
  • Page 247 SiUS372201EA Field Setting from Outdoor Unit [2-38]: Emergency operation “Master” To disable compressor operation permanently: in case of single module or “Master” unit of a multi outdoor system, this setting allows: Default value: 0. Compressor operation enabled. Field setting:  Set 1: Master INV. 1 is disabled permanently. ...
  • Page 248 Field Setting from Outdoor Unit SiUS372201EA [2-49]: Height difference setting Default value: 0. In case the outdoor unit is installed in the highest position (indoor units are installed on a lower position than outdoor units) and the height difference between the lowest indoor unit and the outdoor unit exceeds 50 m (164 ft), the setting [2-49] has to be changed to 1.
  • Page 249 SiUS372201EA Field Setting from Outdoor Unit [2-81]: Cooling comfort setting Default value: 1 Value Cooling comfort setting [2-81] 1 (default) Mild Quick Powerful Change [2-81] to 0, 1, 2 or 3 in function of required limitation. This setting is used in conjunction with setting [2-8] and [2-47]. For more information and advice about the effect of these settings, see Energy Saving and Optimum Operation on page 254.
  • Page 250 Field Setting from Outdoor Unit SiUS372201EA [2-92]: Te target temperature upper limit Default value: 1. Value Te target temperature upper limit [2-92] 1 (default) If Auto Te, then use this setting to address different load profiles. If the frequent operation is at lower system load, then use a higher setting under [2-92].
  • Page 251 SiUS372201EA Field Setting from Outdoor Unit 2.5.4 Auxiliary Heat Control To improve efficiency the auxiliary heat can be lockout based on outdoor temperature. Item Description Increments Auxiliary heater Below this temperature, auxiliary 65°F allowable heater can be energized based 0°F (35°F 5°F temperature...
  • Page 252 Field Setting from Outdoor Unit SiUS372201EA 2.5.5 Heat Pump Lockout New control logic to provide more application options for cold climates. Outside temperature can now be measured directly from the outdoor unit coil sensor. This field setting can switch automatically to emergency heat if there is a system fault. Item Description Increments...
  • Page 253 SiUS372201EA Field Setting from Outdoor Unit [2-78]: Heat pump lockout temperature Heat pump would be locked out when the outdoor air temperature is smaller than the Heat Pump Lockout Temperature below – this setting is only affective when heat pump lockout mode has been set. Unit will switch to heat pump lockout. Heat pump lockout Fahrenheit (°F) Celsius (°C)
  • Page 254 Field Setting from Outdoor Unit SiUS372201EA [2-79]: Heat pump lockout release differential Heat pump would be resumed when the outdoor air temperature is recovered by differential (below) above the heat pump lockout temperature. Heat pump lockout Fahrenheit (°F) Celsius (°C) release differential 1 (default) When heat pump lockout mode has been set the auto backup function will automatically be set.

  • Page 255: Cool/Heat Mode Changeover

    SiUS372201EA Field Setting from Outdoor Unit Cool/Heat Mode Changeover Set Cool/Heat Separately for Each Branch Selector Unit by Cool/Heat Selector. Set remote controller changeover switch DS1-1 as following:  Set the DIP switch (DS1-1) on printed circuit board (A1P) as shown below before turning on the power to the Branch Selector unit.

  • Page 256: Night-Time Low Noise Operation And Demand Operation

    Field Setting from Outdoor Unit SiUS372201EA Night-Time Low Noise Operation and Demand Operation 2.7.1 Night-Time Low Noise Operation By connecting the external contact input to the low noise input of the outdoor unit external control adaptor (optional), you can lower operating noise. Setting Content Level 1...
  • Page 257 SiUS372201EA Field Setting from Outdoor Unit Image of operation in the case of A Operation sound Rated Operation sound during low noise mode can be set with Low noise mode instructing External low noise Level 1 Approx. 55 dB (target) level setting (Factory setting is level 2.) Level 2...
  • Page 258 Field Setting from Outdoor Unit SiUS372201EA 2.7.2 Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition. Description of setting Setting procedure External control adaptor for...
  • Page 259 SiUS372201EA Field Setting from Outdoor Unit Image of operation in the case of A Power consumption Rated The power Demand level 1 Demand level 2 Demand level 3 consumption instructing instructing instructing during the demand level 1 instructing can be set with the Power consumption set by Demand 1 level...
  • Page 260 Field Setting from Outdoor Unit SiUS372201EA 2.7.3 Setting Procedure of Night-Time Low Noise Operation and Demand Operation 1. Setting mode 1 (H1P OFF) In setting mode 2, press the MODE (BS1) button once  Setting mode 1 is entered and H1P turns OFF.

  • Page 261: Energy Saving And Optimum Operation

    SiUS372201EA Field Setting from Outdoor Unit Energy Saving and Optimum Operation This VRV heat recovery system is equipped with advanced energy saving functionality (VRT). Detecting all connected indoor unit type, advanced energy saving functionality type is selected automatically. Depending on the priority, emphasizes can be put on energy saving or comfort level. Several parameters can be selected, resulting in the optimal balance between energy consumption and comfort for the particular application.
  • Page 262 Field Setting from Outdoor Unit SiUS372201EA  To activate this setting under heating operation: change field setting [2-9] to the appropriate value, matching the requirements of the pre-designed system containing a high sensible solution. Value Tc target [2-9] 106°F (41°C) 109°F (43°C) 2.8.2 Comfort Settings A comfort level can be set for VRT control mode and hi-sensible mode.
  • Page 263 SiUS372201EA Field Setting from Outdoor Unit • Eco The original refrigerant temperature target, which is defined by the operation method (see above) is kept without any correction, unless for protection control.  To activate the eco comfort setting under cooling operation, change field setting [2-81] to 0. ...

  • Page 264: Field Settings For Branch Selector Unit

    Field Settings for Branch Selector Unit SiUS372201EA 3. Field Settings for Branch Selector Unit Field Settings for Single Branch Selector Unit Follow the instructions below to set the DIP switches as necessary. Warning Electric shock hazard! Before performing work, be sure to disconnect any power source connected to the unit.

  • Page 265: Field Settings For Multi Branch Selector Unit (Standard Series)

    SiUS372201EA Field Settings for Branch Selector Unit Field Settings for Multi Branch Selector Unit (Standard Series) Follow the instructions below to set the DIP switches as necessary. Warning Electric shock hazard! Before performing work, be sure to disconnect any power source connected to the unit.

  • Page 266: Field Settings For Multi Branch Selector Unit (Flex Series)

    Field Settings for Branch Selector Unit SiUS372201EA 2. Setting when joining branch ports Setting when joining branch ports Setting (Example 2) ON (Joined) DIP switch setting OFF (Factory default) (A1P) (A2P) (A3P) DIP switch No. (Example 2) When joining the A and B BS4Q54TVJ branches BS4Q54TAVJ...
  • Page 267 SiUS372201EA Field Settings for Branch Selector Unit BSF6/8Q54TVJ Branch port number 1 2 3 4 Note DIP switch A B C D E F G H Note) As for factory default, refer to the electric wiring diagram attached to the control box cover. Terminal No.

  • Page 268: How To Check Miswiring For Multi Branch Selector Unit

    Field Settings for Branch Selector Unit SiUS372201EA How to Check Miswiring for Multi Branch Selector Unit When miswiring of the transmission wire between the Branch Selector unit and the indoor unit is suspected It is possible to check the miswiring by operating the DIP switches to turn ON the corresponding indoor fans to see which wires are miswired according to the procedure below.

  • Page 269: Test Operation

    SiUS372201EA Test Operation 4. Test Operation Checks before Test Operation Before carrying out a test operation, proceed as follows: Step Action Make sure the voltage at the primary side of the safety breaker is: 187 - 253 V (-AATJ*) 416 - 508 V (-AAYD*) Fully open the liquid and the gas stop valve.

  • Page 270: Gas Furnace Test Operation

    Test Operation SiUS372201EA 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 271 SiUS372201EA Part 6 Service Diagnosis 1. Symptom-based Troubleshooting ............267 1.1 Indoor Unit Overall ................... 267 1.2 With Gas Furnace ..................270 1.3 Gas Furnace Lockout Reset..............270 1.4 With Infrared Presence/Floor Sensor ............271 2. Troubleshooting with Remote Controller..........272 2.1 BRC1E73 ....................272 2.2 BRC1H71W....................
  • Page 272 SiUS372201EA 3.29 Humidity Sensor System Abnormality ............334 3.30 Infrared Presence/Floor Sensor Error ............335 3.31 Remote Controller Thermistor Abnormality ..........340 3.32 Outdoor Unit Main/Sub PCB Abnormality ..........341 3.33 Detection of Ground Leakage by Leak Detection Circuit ......342 3.34 Missing of Ground Leakage Detection Core ..........
  • Page 273 SiUS372201EA 3.73 Incorrect Gas Furnace Connecting Number..........413 3.74 Incorrect Electric Heater Capacity Setting..........414 3.75 Address Duplication of Centralized Controller.......... 415 3.76 Transmission Error between Centralized Controller and Indoor Unit ..416 3.77 System Not Set Yet .................. 419 3.78 System Abnormality, Refrigerant System Address Undefined ....

  • Page 274: Symptom-Based Troubleshooting

    Symptom-based Troubleshooting SiUS372201EA 1. 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 275 SiUS372201EA Symptom-based Troubleshooting 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 276 Symptom-based Troubleshooting SiUS372201EA 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 277: With Gas Furnace

    SiUS372201EA 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 278: With Infrared Presence/Floor Sensor

    Symptom-based Troubleshooting SiUS372201EA With Infrared Presence/Floor Sensor Condition Measure "Louver operation different from setting" or "No downward Refer to the flowchart below. airflow in heating operation" Individual airflow direction setting different from the actual · Check the "Louver operation different from setting" error airflow direction diagnosis.

  • Page 279: Troubleshooting With Remote Controller

    SiUS372201EA Troubleshooting with Remote Controller 2. Troubleshooting with Remote Controller 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 280: Brc1H71W

    Troubleshooting with Remote Controller SiUS372201EA 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 281 SiUS372201EA Troubleshooting with Remote Controller  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 282: Troubleshooting By Error Code

    Troubleshooting by Error Code SiUS372201EA 3. 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 Overload/overcurrent/lock of indoor fan motor...
  • Page 283 SiUS372201EA Troubleshooting by Error Code Error Operation Reference Error contents code lamp page Box air thermistor abnormality Harness abnormality (between outdoor unit main PCB and inverter PCB) Outdoor fan PCB abnormality Outdoor air thermistor abnormality Discharge pipe thermistor abnormality Compressor body thermistor abnormality Compressor suction thermistor abnormality Suction pipe before accumulator thermistor abnormality Heat exchanger deicer thermistor abnormality...

  • Page 284: Error Codes (Sub Codes)

    Troubleshooting by Error Code SiUS372201EA 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 or a diagnosis of the relevant unit. 3.2.1 Indoor Unit Troubleshooting Error code Error Description...
  • Page 285 SiUS372201EA Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis Indoor blower does not have required parameters to Refer to page 332. C6 - 02 function U4 - 01 Indoor-outdoor transmission error Refer to the U4 flowchart. Refrigerant type error The type of refrigerant used for the indoor unit is different UA - 13 from that used for the outdoor unit.
  • Page 286 Troubleshooting by Error Code SiUS372201EA Troubleshooting Error code Error Description Diagnosis E6 - 11 Compressor damage error: Compressor M1C (Master) Refer to the E6 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. E6 - 12 Compressor damage error: Compressor M2C (Master) E6 - 13...
  • Page 287 SiUS372201EA Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis Defective four way valve (intermediate stop) (Y10S) Refer to the EA flowchart and make a diagnosis of the EA - 02 (Master) relevant unit based on the Error code shown to the left. Defective four way valve (intermediate stop) (Y7S) EA - 03 (Master)
  • Page 288 Troubleshooting by Error Code SiUS372201EA Troubleshooting Error code Error Description Diagnosis H7 - 21 Defective fan PCB (Master): M1F Refer to the H7 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. H7 - 22 Defective fan PCB (Master): M2F H7 - 23...
  • Page 289 SiUS372201EA Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis Defective heat exchanger right deicer thermistor (R8T) Refer to the J6 flowchart and make a diagnosis of the J6 - 01 (Master) relevant thermistor of the relevant unit based on the Error code shown to the left.
  • Page 290 Troubleshooting by Error Code SiUS372201EA Troubleshooting Error code Error Description Diagnosis Defective subcooling heat exchanger gas pipe thermistor Refer to the J9 flowchart and make a diagnosis of the J9 - 01 (R12T) (Master) relevant thermistor of the relevant unit based on the Error code shown to the left.
  • Page 291 SiUS372201EA Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis L2 - 01 Momentary power failure during test operation (Master) Refer to the L2 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. L2 - 02 Momentary power failure during test operation (Sub) L2 - 04...
  • Page 292 Troubleshooting by Error Code SiUS372201EA Troubleshooting Error code Error Description Diagnosis P1 - 01 Inverter 1 power supply unbalanced voltage (Master) Refer to the P1 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. P1 - 02 Inverter 1 power supply unbalanced voltage (Sub) P1 - 07...
  • Page 293 SiUS372201EA Troubleshooting by Error Code Troubleshooting Error code Error Description Diagnosis U3 - 02 Initial installation warning Refer to the U3 flowchart and make a diagnosis of the relevant unit based on the Error code shown to the left. U3 - 03 Test operation not conducted U3 - 04 Abnormal end of test operation...

  • Page 294: Prediction Codes

    Troubleshooting by Error Code SiUS372201EA Prediction Codes Prediction Code List Seven-segment display Description Possible cause Tech tips Compressor overcurrent prediction Error code L5, L8 Refer to L5, L8 troubleshooting 10A-## _ _ 1 0 0 1 - # # — Same as L8 EVM1 refrigerant leakage prediction ■...
  • Page 295 SiUS372201EA Troubleshooting by Error Code Seven-segment display Description Possible cause Tech tips Heat exchanger liquid pipe thermistor ■ Tf1 sensor failure Refer to J8 troubleshooting. 16I-## _ _ 1 6 0 9 - # # — 1 failure prediction (Tf1) Heat exchanger liquid pipe thermistor ■...
  • Page 296 Troubleshooting by Error Code SiUS372201EA Prediction Code Detail Information – Sub code ■ In case is not “3”, Tens digit – 0: System, 1: Main, 2: Sub Ones digit – 0: Others, 1: Compressor 1, 2: Compressor 2 ■ In case is “3”, Under AirNet system, “##”...
  • Page 297 SiUS372201EA Troubleshooting by Error Code Prediction Code Detail Information by Seven-segment Display in Monitor Mode Push BS2 Push BS2 Push BS2 Prediction code Product type digit Prediction sub code AirNet address display flag Type of Detail of error error SEG1 SEG2 SEG3 SEG1...

  • Page 298: External Protection Device Abnormality

    Troubleshooting by Error Code SiUS372201EA External Protection Device Abnormality 3.4.1 External Protection Device Abnormality Applicable All indoor unit models 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 Conditions "external ON/OFF terminal".
  • Page 299 SiUS372201EA Troubleshooting by Error Code 3.4.2 External Protection Device Abnormality (FXTQ-TA and CXTQ-TA Only) Applicable FXTQ-TA, CXTQ-TA Models A0-01 Error Code Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals. Conditions Supposed ...

  • Page 300: Indoor Unit Control Pcb Abnormality

    Troubleshooting by Error Code SiUS372201EA 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 301: Drain Level Control System Abnormality

    SiUS372201EA Troubleshooting by Error Code Drain Level Control System Abnormality Applicable FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXDQ-M, FXSQ-TA, FXSQ-TB, Models 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 302 Troubleshooting by Error Code SiUS372201EA 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 303: Indoor Fan Motor Lock, Overload

    SiUS372201EA Troubleshooting by Error Code Indoor Fan Motor Lock, Overload Applicable FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXSQ05-48TA, FXSQ05-48TB, Models 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 304 Troubleshooting by Error Code SiUS372201EA 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 305: Indoor Fan Motor Abnormality

    SiUS372201EA Troubleshooting by Error Code Indoor Fan Motor Abnormality 3.8.1 Indoor Fan Motor Abnormality (FXDQ-M, FXHQ-M Models) Applicable FXDQ-M, FXHQ-M Models Error Code Method of Error This error is detected if there is no revolution detection signal output from the fan motor. Detection Error Decision When no revolutions can be detected even at the maximum output voltage to the fan...
  • Page 306 Troubleshooting by Error Code SiUS372201EA 3.8.2 Indoor Fan Motor Abnormality (FXSQ54TA, FXSQ54TB, FXMQ15-54PB, FXMQ30-54TB Models) Applicable FXSQ54TA, FXSQ54TB, FXMQ15-54PB, FXMQ30-54TB Models Error Code Method of Error  Error from the current flow on the fan PCB  Error from the rotation speed of the fan motor in operation Detection ...
  • Page 307 SiUS372201EA 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 and wait for 10 minutes. There is a foreign matter around Remove the foreign matter.
  • Page 308 Troubleshooting by Error Code SiUS372201EA 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 309: Overload/Overcurrent/Lock Of Indoor Fan Motor

    SiUS372201EA Troubleshooting by Error Code Overload/Overcurrent/Lock of Indoor Fan Motor Applicable FXMQ-M Models Error Code Outline This error is detected by detecting that the individual power supply for the fan turns OFF. Error Decision When it is not detected that the individual power supply for the indoor fan turns ON while in Conditions operation.

  • Page 310: Blower Motor Not Running

    Troubleshooting by Error Code SiUS372201EA 3.10 Blower Motor Not Running Applicable FXTQ-TA Models Error Code Outline Error is issued if the indoor unit determines that the indoor fan motor cannot rotate. Error Decision  Determining successive abnormalities Conditions Checks the rotation speed at 5-second intervals using the feedback of the fan motor. If that figure falls below 50 rpm 5 times successively, it is deemed abnormal operation.

  • Page 311: Indoor Fan Motor Status Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.11 Indoor Fan Motor Status Abnormality Applicable FXTQ-TA Models A6-20 Error Code Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Power Limit or Temp Limit status, it will be deemed a MOTOR LIMIT Conditions abnormal operation.

  • Page 312: Low Indoor Airflow

    Troubleshooting by Error Code SiUS372201EA 3.12 Low Indoor Airflow Applicable FXTQ-TA Models A6-21 Error Code Outline Error is issued if the indoor unit determines that the indoor fan motor rotation is insufficient, regardless of the rotation command from indoor unit. Error Decision ...

  • Page 313: Swing Flap Motor Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.13 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 314 Troubleshooting by Error Code SiUS372201EA 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 315: Power Supply Voltage Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.14 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 316: Blower Motor Stops For Over/Under Voltage

    Troubleshooting by Error Code SiUS372201EA 3.15 Blower Motor Stops for Over/Under Voltage Applicable FXTQ-TA Models Error Code Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Over/Under Voltage status, it will be deemed a MOTOR VOLTS abnormal Conditions operation.

  • Page 317: Electronic Expansion Valve Coil Abnormality, Dust Clogging

    SiUS372201EA Troubleshooting by Error Code 3.16 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 318: Gas Furnace Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.17 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 319: Drain Level Above Limit

    SiUS372201EA Troubleshooting by Error Code 3.18 Drain Level above Limit Applicable FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXDQ-M, FXSQ-TA, FXSQ-TB, Models 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 320: Self-Cleaning Decoration Panel Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.19 Self-Cleaning Decoration Panel Abnormality Applicable FXFQ-T (when self-cleaning decoration panel BYCQ125BGW1 is installed) Models Error Code Method of Error Error is detected by abnormal signal from the self-cleaning decoration panel. Detection Error Decision Any of the following conditions is met while the unit is in operation. Conditions ...
  • Page 321 SiUS372201EA 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 322 Troubleshooting by Error Code SiUS372201EA 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 323 SiUS372201EA 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 324 Troubleshooting by Error Code SiUS372201EA Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Diagnosis Flowchart-3 AH-05 Dust collection sign Is the inside of dust collection port clogged Clean the dust from the inside by dust? of dust collection port.
  • Page 325 SiUS372201EA 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 326 Troubleshooting by Error Code SiUS372201EA 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 327 SiUS372201EA 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 328 Troubleshooting by Error Code SiUS372201EA 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 329 SiUS372201EA 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 330 Troubleshooting by Error Code SiUS372201EA 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 331: Capacity Determination Device Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.20 Capacity Determination Device Abnormality Applicable All indoor unit models Models Error Code Method of Error Capacity is determined according to resistance of the capacity setting adaptor and the memory Detection inside the IC memory on the indoor unit control PCB, and whether the value is normal or abnormal is determined.

  • Page 332: Transmission Abnormality Between Indoor Unit Control Pcb And Fan Pcb

    Troubleshooting by Error Code SiUS372201EA 3.21 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 333 SiUS372201EA 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 334: Blower Motor Communication Error

    Troubleshooting by Error Code SiUS372201EA 3.22 Blower Motor Communication Error Applicable FXTQ-TA Models C1-07 Error Code Outline Error is issued if transmission abnormalities occur between indoor unit and fan motor. Error Decision If the response message from the fan motor is an abnormal message, and determined as such by Conditions the indoor unit, the indoor unit will execute a retry.

  • Page 335: Climate Talk Communication Error

    SiUS372201EA Troubleshooting by Error Code 3.23 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 336: Thermistor Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.24 Thermistor Abnormality Applicable C4, C5: All indoor units Models C9: except FXTQ-TA and CXTQ-TA models CA: FXMQ-PB models only C4, C5, C9, CA Error Code Method of Error The error is determined by the temperature detected by the thermistor. Detection Error Decision The thermistor becomes disconnected or shorted while the unit is running.

  • Page 337: Combination Error Between Indoor Unit Control Pcb And Fan Pcb

    SiUS372201EA Troubleshooting by Error Code 3.25 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 338: Blower Motor Hp Mismatch

    Troubleshooting by Error Code SiUS372201EA 3.26 Blower Motor HP Mismatch Applicable FXTQ-TA Models C6-01 Error Code Outline Error is issued if the manufacturer ID and output of the connected fan motor do not match those recognized by the indoor unit. Error Decision Gathers information on the manufacturer ID and output of the fan motor when initializing the fan Conditions...

  • Page 339: Indoor Blower Does Not Have Required Parameters To Function

    SiUS372201EA Troubleshooting by Error Code 3.27 Indoor Blower Does Not Have Required Parameters to Function Applicable FXTQ-TA Models C6-02 Error Code Outline Indoor units perform required settings for control on the fan motor, but if the minimum required settings are not made then information indicating as such will be included among the periodic control status information.

  • Page 340: Remote Sensor Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.28 Remote Sensor Abnormality Applicable FXTQ-TA, CXTQ-TA Models Error Code Method of Error The error is detected by remote sensor temperature. Detection Error Decision When the remote sensor becomes disconnected or shorted while the unit is running. Conditions Supposed ...

  • Page 341: Humidity Sensor System Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.29 Humidity Sensor System Abnormality Applicable FXFQ-T 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 342: Infrared Presence/Floor Sensor Error

    Troubleshooting by Error Code SiUS372201EA 3.30 Infrared Presence/Floor Sensor Error Applicable FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA Models Error Code Method of Error The contents of a failure vary with the detailed error code. Check the code and proceed with the Detection flowchart.
  • Page 343 SiUS372201EA 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 344 Troubleshooting by Error Code SiUS372201EA 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 345 SiUS372201EA 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 346 Troubleshooting by Error Code SiUS372201EA 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 347: Remote Controller Thermistor Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.31 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 348: Outdoor Unit Main/Sub Pcb Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.32 Outdoor Unit Main/Sub 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 349: Detection Of Ground Leakage By Leak Detection Circuit

    SiUS372201EA Troubleshooting by Error Code 3.33 Detection of Ground Leakage by Leak Detection Circuit Applicable All outdoor unit models Models Error Code Sub code: 01, 02 Method of Error Detect leakage current in the ground leakage detection circuit and detect error on the outdoor unit Detection main PCB.

  • Page 350: Missing Of Ground Leakage Detection Core

    Troubleshooting by Error Code SiUS372201EA 3.34 Missing of Ground Leakage Detection Core Applicable All outdoor unit models Models Error Code Sub code: 06, 07 Method of Error Error is detected according to whether or not there is continuity across the connector X101A for Detection leakage detection circuit (Q1LD).

  • Page 351: Activation Of High Pressure Switch

    SiUS372201EA Troubleshooting by Error Code 3.35 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 352 Troubleshooting by Error Code SiUS372201EA 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 353: Activation Of Low Pressure Sensor

    SiUS372201EA Troubleshooting by Error Code 3.36 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 354: Compressor Motor Lock

    Troubleshooting by Error Code SiUS372201EA 3.37 Compressor Motor Lock Applicable All outdoor unit models Models Error Code Method of Error Inverter PCB takes the position signal from UVW line connected between the inverter and Detection compressor, and the error is detected when any abnormality is observed in the phase-current waveform.
  • Page 355 SiUS372201EA Troubleshooting by Error Code The insulation resistance of the relevant Replace the compressor. compressor is low (< 100 k:) Power OFF The internal wiring of the compressor coil is defective. Restart the compressor, and then check for the Quit work. operation.

  • Page 356: Compressor Damage Alarm

    Troubleshooting by Error Code SiUS372201EA 3.38 Compressor Damage Alarm Applicable All outdoor unit models Models Error Code Method of Error Determine the symptom to be error by detecting the revolutions of the compressor and pressure Detection values detected by the high and low pressure sensors, and further making a comparison between a theoretical current value of the compressor calculated from parameters detected and an actual current value detected by the power transistor.
  • Page 357 SiUS372201EA Troubleshooting by Error Code the high pressure and ow pressure checked by the service checker the Replace the outdoor unit main same as the actual measured PCB (A1P). values of the high and low pressure sensors? CHECK 4 Is the power transistor Replace the inverter PCB.

  • Page 358: Outdoor Fan Motor Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.39 Outdoor Fan Motor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detects according to the value of current flowing through the fan PCB. Detection Error Decision  Overcurrent is detected from the fan PCB (Detecting overcurrent 4 times will shut down the Conditions system).
  • Page 359 SiUS372201EA Troubleshooting by Error Code The fan cannot be rotated by hand when Replace the relevant fan motor disconnecting the connector from the (M1F, M2F). fan motor. Resistance between the fan motor power supply cable Replace the relevant fan motor terminal and the motor (M1F, M2F).

  • Page 360: Electronic Expansion Valve Coil Abnormality Or Sub Pcb Momentary Overcurrent

    Troubleshooting by Error Code SiUS372201EA 3.40 Electronic Expansion Valve Coil Abnormality or Sub PCB Momentary Overcurrent Applicable All outdoor unit models Models Error Code Method of Error Detects according to whether or not there is continuity across the electronic expansion valve coils. Detection Error Decision When no current flows through common (COM[+]) at the time of turning ON the power supply.

  • Page 361: Four Way Valve Abnormality (Intermediate Stop)

    SiUS372201EA Troubleshooting by Error Code 3.41 Four Way Valve Abnormality (Intermediate Stop) Applicable All outdoor unit models Models Error Code Sub code: 02-09 Method of Error Detect the intermediate stop of the four way valve according to pressure sensors. Detection Error Decision When there is no pressure difference between high and low pressure.

  • Page 362: Four Way Valve Abnormality (Not Switching)

    Troubleshooting by Error Code SiUS372201EA 3.42 Four Way Valve Abnormality (Not Switching) Applicable All outdoor unit models Models Error Code Sub code: 14-21 Method of Error Detect the non-switching of the four way valve according to temperature and pressure. Detection Error Decision ...
  • Page 363 SiUS372201EA 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 four way valve connector properly Connect the connector correctly. connected to the main PCB? Is the coil of the Firmly fix the coil.

  • Page 364: Opposite Air Conditioning Alarm

    Troubleshooting by Error Code SiUS372201EA 3.43 Opposite Air Conditioning Alarm Applicable All outdoor unit models Models Error Code Sub code: 26 Method of Error Detects by the temperature of each thermistor of the indoor unit. Detection Error Decision  When the flow direction of the refrigerant is heating during cooling operation in the indoor unit. Conditions ...

  • Page 365: Discharge Pipe Temperature Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.44 Discharge Pipe Temperature Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect according to temperature detected with the discharge pipe or compressor body thermistor. Detection Error Decision  When discharge pipe temperature becomes abnormally high (i.e., 135°C (275°F) or more) Conditions ...
  • Page 366 Troubleshooting by Error Code SiUS372201EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the Service Checker. Reset the system operation, and then restart it. CHECK 11 Are the characteristics of the discharge pipe and Replace the relevant thermistor.

  • Page 367: Wet Alarm

    SiUS372201EA Troubleshooting by Error Code 3.45 Wet Alarm Applicable All outdoor unit models Models Error Code Method of Error In cooling operation, detect the condition under which liquid refrigerant returns to the compressor, Detection according to the temperature and pressure of each part. Error Decision When the following wet state continues for a period of 90 minutes, an alert is issued.
  • Page 368 Troubleshooting by Error Code SiUS372201EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the Service Checker. Mount a pressure gauge on the high pressure service port. Reset the operation, and then restart the operation. Are the characteristics of the suction pipe...

  • Page 369: Refrigerant Overcharged

    SiUS372201EA Troubleshooting by Error Code 3.46 Refrigerant Overcharged Applicable All outdoor unit models Models Error Code Method of Error Detect overcharged refrigerant according to outdoor air temperature, heat exchanger deicer Detection temperature, and liquid pipe temperature during check operation. Error Decision When the amount of refrigerant, which is calculated using outdoor air temperature, heat exchanger Conditions deicer temperature, and liquid pipe temperature during check operation, exceeds the regular...

  • Page 370: Branch Selector Unit Electronic Expansion Valve Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.47 Branch Selector Unit Electronic Expansion Valve Abnormality Applicable Branch Selector unit Models Error Code Method of Error The error is detected by whether or not all coils of the electronic expansion valve have continuity. Detection Error Decision The power supply turns ON, but there is no currents pass through the common (COM[+]).
  • Page 371 SiUS372201EA Troubleshooting by Error Code Note(s) 1. Use the sub code to identify the electronic expansion valve subject to error code F9. Electronic expansion valve Sub code Electronic expansion valve (EVH) Electronic expansion valve (EVL) Electronic expansion valve (EVSC) 2. Use the sub code to identify the electronic expansion valve for checking coil resistance subject to error code F9.

  • Page 372: Thermistor Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.48 Thermistor Abnormality Applicable All outdoor unit models Models H1, H9, J3, J5, J6, J7, J8, J9 Error Code Method of Error Detect according to temperature detected with individual thermistors. Detection Error Decision The system is in operation and the thermistor causes wiring disconnection or short circuit in it. Conditions Supposed ...

  • Page 373: Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb)

    SiUS372201EA Troubleshooting by Error Code 3.49 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB) Applicable All outdoor unit models Models Error Code Method of Error Check for the transmission conditions of the harnesses between the PCBs using microcomputer. Detection Error Decision Normal transmission between the PCBs is disabled while the compressor is not running.

  • Page 374: Outdoor Fan Pcb Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.50 Outdoor Fan PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect with current sensor value. Detection Error Decision When the current sensor shows abnormality. Conditions Supposed Defective fan PCB Causes Troubleshooting Be sure to turn off the power switch before connecting or disconnecting...

  • Page 375: High Pressure Sensor Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.51 High Pressure Sensor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detects according to temperature detected with 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 376: Low Pressure Sensor Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.52 Low Pressure Sensor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect according to temperature detected with the 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 377: Inverter Pcb Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.53 Inverter PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error  Detect current value during the output of waveform before compressor startup Detection  Detect current value with the current sensor during synchronous operation for startup Error Decision ...
  • Page 378 Troubleshooting by Error Code SiUS372201EA 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 once, and then turn it ON again. The error could have resulted from Return to normal? external factors other than failures (e.g.

  • Page 379: Momentary Power Failure During Test Operation

    SiUS372201EA Troubleshooting by Error Code 3.54 Momentary Power Failure during Test Operation Applicable All outdoor unit models Models Error Code Method of Error Momentary power failure is detected by the PCB. Detection Error Decision Judgment is made by AC power frequency detection circuit on the outdoor unit main PCB. Conditions Supposed ...

  • Page 380: Inverter Radiation Fin Temperature Rise Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.55 Inverter Radiation Fin Temperature Rise Abnormality 3.55.1 Inverter Radiation Fin Temperature Rise Abnormality (Inverter PCB) Applicable All outdoor unit models Models Error Code Sub code: 01, 02, 09, 10 Method of Error Detect temperature of power module of the inverter PCB. Detection Error Decision Thermistor located inside the power module of the inverter PCB for compressor and fan motor.
  • Page 381 SiUS372201EA Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for the cooling conditions of cooling tube used to cool the inverter. (1) Is the cooling tube plate fixed with screws? (2) Error code U0 is displayed on the Error History...
  • Page 382 Troubleshooting by Error Code SiUS372201EA 3.55.2 Inverter Radiation Fin Temperature Rise Abnormality (Fan PCB) Applicable All outdoor unit models Models Error Code Sub code: 06, 07, 18, 19 Method of Error Fan PCB radiation fin temperature is detected by the thermistor located inside the fan PCB circuit. Detection Error Decision Detected temperature exceeds a certain level.

  • Page 383: Compressor Instantaneous Overcurrent

    SiUS372201EA Troubleshooting by Error Code 3.56 Compressor Instantaneous Overcurrent Applicable All outdoor unit models Models Error Code Method of Error Detect current flowing through the power transistor. Detection Error Decision When overcurrent flows instantaneously through the power transistor. Conditions Supposed ...
  • Page 384 Troubleshooting by Error Code SiUS372201EA Power OFF CHECK 4 Is the power Replace the inverter PCB. transistor normal? Restarting the system results Continue operation. in the recurrence of the error. The error could have resulted from causes such as instantaneous power failure.

  • Page 385: Compressor Overcurrent

    SiUS372201EA Troubleshooting by Error Code 3.57 Compressor Overcurrent Applicable All outdoor unit models Models Error Code Method of Error Detect current flowing through the power transistor. Detection Error Decision When the secondary-side inverter current exceeds a certain value. Conditions Supposed ...
  • Page 386 Troubleshooting by Error Code SiUS372201EA Power OFF CHECK 4 Is the power Replace the inverter PCB. transistor normal? Restarting the system results Continue operation. in the recurrence of The error could have the error. resulted from causes such as instantaneous power failure.

  • Page 387: Compressor Startup Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.58 Compressor Startup Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect error according to the signal waveform of compressor. Detection Error Decision When compressor startup operation has not been completed. Conditions Supposed ...
  • Page 388 Troubleshooting by Error Code SiUS372201EA Refrigerant is stagnated. (The unit is out Solve the refrigerant stagnation. of power supply for more (Power should be supplied for more than 6 hours.) than 6 hours.) Is the insulation resistance of the relevant Replace the compressor.

  • Page 389: Transmission Error Between Inverter Pcb And Outdoor Unit Main Pcb

    SiUS372201EA Troubleshooting by Error Code 3.59 Transmission Error between Inverter PCB and Outdoor Unit Main PCB Applicable All outdoor unit models Models Error Code Method of Error Check for the transmission conditions between the inverter PCB and the outdoor unit main PCB Detection using a microcomputer.
  • Page 390 Troubleshooting by Error Code SiUS372201EA microcomputer normal monitor indication This is not the LC error. lamp (green) on the outdoor unit main PCB (A1P) Recheck the error code. is blinking. microcomputer normal monitor indication The fuse of the Replace the inverter PCB. lamp (green) on the outdoor noise filter PCB has unit main PCB (A1P) is...

  • Page 391: Power Supply Voltage Imbalance

    SiUS372201EA Troubleshooting by Error Code 3.60 Power Supply Voltage Imbalance Applicable All outdoor unit models Models Error Code Method of Error Detect voltage imbalance through inverter PCB. Detection Error Decision When power supply voltage imbalance exceeds approximately 12 V. Conditions Error is not decided while the unit operation is continued.
  • Page 392  Use the document “Notice of Inspection Results” attached to spare part. Explanation to users Be sure to explain user that “power supply Hand the “Notice of Inspection Results” to user to ask voltage imbalance” will occur and Daikin him/her to rectify the imbalance. accepts no responsibility for the imbalance. Note(s) 1.

  • Page 393: Inverter Radiation Fin Temperature Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.61 Inverter Radiation Fin Temperature Abnormality 3.61.1 Inverter Radiation Fin Temperature Abnormality (Inverter PCB) Applicable All outdoor unit models Models Error Code Sub code: 09-13 Method of Error Detect the resistance of the following thermistors while the compressor is not running: Detection ...
  • Page 394 Troubleshooting by Error Code SiUS372201EA 3.61.2 Inverter Radiation Fin Temperature Abnormality (Fan PCB) Applicable All outdoor unit models Models Error Code Sub code: 02, 03, 15, 16 Method of Error Detects the resistance of the thermistor located inside the fan PCB circuit while the fan motor is not Detection in operation.

  • Page 395: Field Setting Abnormality After Replacing Outdoor Unit Main Pcb Or Combination Of Pcb Abnormality

    SiUS372201EA Troubleshooting by Error Code 3.62 Field Setting Abnormality after Replacing Outdoor Unit Main PCB or Combination of PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error This error is detected according to communications with the inverter PCB. Detection Error Decision Make judgement according to communication data on whether or not the type of the inverter PCB is...

  • Page 396: Refrigerant Shortage

    Troubleshooting by Error Code SiUS372201EA 3.63 Refrigerant Shortage Applicable All outdoor unit models Models Error Code Method of Error Detect refrigerant shortage according to a low pressure level or a difference in heat exchanging Detection temperature from the suction pipe. Error Decision Low pressure becomes 0.1 MPa (14.5 psi) or less.

  • Page 397: Reverse Phase, Open Phase, Power Supply Frequency Issue

    SiUS372201EA Troubleshooting by Error Code 3.64 Reverse Phase, Open Phase, Power Supply Frequency Issue Applicable All outdoor unit models Models Error Code Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or Detection reverse phase are judged.

  • Page 398: Power Supply Insufficient Or Instantaneous Abnormality

    Troubleshooting by Error Code SiUS372201EA 3.65 Power Supply Insufficient or Instantaneous Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect the voltage of capacitor of the main circuit in the inverter PCB. Detection Error Decision When the voltage in the DC circuit (between diode module and power module) falls below 190 VDC Conditions (for 208/230 V models) or 380 VDC (for 460 V models).
  • Page 399 SiUS372201EA Troubleshooting by Error Code The insulation resistance of the fan Replace the fan motor motor is not more than (M1F, M2F). 1 M:. If the motor gets severely damaged, the inverter PCB should also be replaced. CHECK 4 Is the power Replace the inverter PCB.

  • Page 400: Check Operation Not Executed

    Troubleshooting by Error Code SiUS372201EA 3.66 Check Operation Not Executed Applicable All outdoor unit models Models Error Code Method of Error The check operation has not been executed. Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions Supposed Check operation not executed.

  • Page 401: Transmission Error Between Indoor Units And Outdoor Units, Open Phase In Power Supply Wiring

    SiUS372201EA Troubleshooting by Error Code 3.67 Transmission Error between Indoor Units and Outdoor Units, Open Phase in Power Supply Wiring 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 Transmission is not carried out normally for a certain amount of time.
  • Page 402 Troubleshooting by Error Code SiUS372201EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for details of error in monitor mode. U4-01/09/10/ Refer to troubleshooting 11/12/13/14 U4-03 (Indoor unit system transmission error) Check the power supply wiring.
  • Page 403 SiUS372201EA Troubleshooting by Error Code Are the indoor-outdoor and outdoor-outdoor Modify the transmission transmission wirings wirings. normal? Disconnect the outdoor-outdoor transmission wiring. Replace the outdoor unit main Does the system normally PCB (A1P). operate with a single transmission line? Mount the DIII-NET extension adaptor.

  • Page 404: Transmission Error Between Remote Controller And Indoor Unit

    Troubleshooting by Error Code SiUS372201EA 3.68 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 405: Transmission Error Between Outdoor Units

    SiUS372201EA Troubleshooting by Error Code 3.69 Transmission Error between Outdoor Units Applicable All outdoor unit models Models Error Code Method of Error Microcomputer checks if transmission between outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time Conditions Supposed ...
  • Page 406 Troubleshooting by Error Code SiUS372201EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Ensure the sub code or the lamp display of monitor mode, and then go to the following: U7-01 Error code Sub code...
  • Page 407 SiUS372201EA Troubleshooting by Error Code Diagnosis Flowchart-1 U7-01 Error code Sub code (Transmission error when the external control adaptor is mounted) there any wiring disconnection or wiring error in the transmission Modify the transmission wirings wirings to the external to the external control adaptor for control adaptor for outdoor unit.
  • Page 408 Troubleshooting by Error Code SiUS372201EA Diagnosis Flowchart-2 U7-02 Error code Sub code (Transmission error when the external control adaptor for outdoor unit is mounted) Unified Cool/Heat Set Cool/Heat selection selection for the external control adaptor for outdoor unit to “IND.” Cool/Heat selection for the external control adaptor...
  • Page 409 SiUS372201EA Troubleshooting by Error Code Diagnosis Flowchart-3 U7-03 Error code Sub code (Transmission error between Master and Sub units) multi transmission wirings to multi Sub unit Replace the outdoor unit main have caused wiring disconnection in them or are being PCB (A1P) for multi Sub unit.
  • Page 410 Troubleshooting by Error Code SiUS372201EA Diagnosis Flowchart-6 U7-07 Error code Sub code (Connection 4 or more outdoor units to the same system) 4 or more outdoor units are connected using Replace the outdoor unit main the outdoor unit multi PCB (A1P). transmission wirings.

  • Page 411: Transmission Error Between Main And Sub Remote Controllers

    SiUS372201EA Troubleshooting by Error Code 3.70 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 412: Transmission Error Between Indoor Units And Outdoor Units In The Same System

    Troubleshooting by Error Code SiUS372201EA 3.71 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 Detect the error signal for the other indoor unit within the circuit by outdoor unit main PCB. Detection Error Decision When the error decision is made on any other indoor unit within the system concerned...

  • Page 413: Improper Combination Of Indoor, Branch Selector And Outdoor Units

    SiUS372201EA Troubleshooting by Error Code 3.72 Improper Combination of Indoor, Branch Selector and Outdoor Units Applicable All indoor unit models Models Branch Selector unit All outdoor unit models Error Code Method of Error  A difference occurs in data by the type of refrigerant between indoor, Branch Selector and Detection outdoor units.
  • Page 414 Troubleshooting by Error Code SiUS372201EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Ensure the sub code or the lamp display of monitor mode, and then go to the following: UA-17 Error code Sub code...
  • Page 415 SiUS372201EA Troubleshooting by Error Code Diagnosis Flowchart-1 UA-17 Error code Sub code number of indoor Is the units connected to the model of indoor unit Replace the outdoor unit main same system is less FXTQ-TA? PCB (A1P). than 64. Incorrect electric heater capacity setting Replace the outdoor unit main...
  • Page 416 Troubleshooting by Error Code SiUS372201EA Diagnosis Flowchart-3 UA-20 Error code Sub code Multi connection? Replace the outdoor unit main PCB (A1P). Was the outdoor unit different model Replace the outdoor unit main main PCB replaced with of outdoor unit is PCB (A1P).
  • Page 417 SiUS372201EA Troubleshooting by Error Code Diagnosis Flowchart-5 UA-25 Error code Sub code Is the wiring between outdoor unit Correct the wiring. and Branch Selector unit correct? Replace the outdoor unit main PCB (A1P). Diagnosis Flowchart-6 UA-26 Error code Sub code Is the wiring between Branch Selector Correct the wiring.
  • Page 418 Troubleshooting by Error Code SiUS372201EA Diagnosis Flowchart-7 UA-27 Error code Sub code the transmission wires between indoor unit and Correct the transmission wires. Branch Selector unit correct? Is the Branch Selector unit PCB Replace the indoor unit PCB or the correct? Branch Selector unit PCB.
  • Page 419 SiUS372201EA Troubleshooting by Error Code Diagnosis Flowchart-9 UA-31 Error code Sub code Is the multi combination of Correct the multi combination of outdoor units outdoor units. proper? Was the outdoor unit PCB Replace the outdoor unit main PCB replaced with a spare (A1P).

  • Page 420: Incorrect Gas Furnace Connecting Number

    Troubleshooting by Error Code SiUS372201EA 3.73 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 421: Incorrect Electric Heater Capacity Setting

    SiUS372201EA Troubleshooting by Error Code 3.74 Incorrect Electric Heater Capacity Setting Applicable FXTQ-TA Models UA-17 Error Code Outline After attaching optional electric heater, if the electric heater capacity setting (11 (21)-5) is made mistakenly for heaters not featured in the lineup, heating via unintended levels of airflow will be prevented.

  • Page 422: Address Duplication Of Centralized Controller

    Troubleshooting by Error Code SiUS372201EA 3.75 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 423: Transmission Error Between Centralized Controller And Indoor Unit

    SiUS372201EA Troubleshooting by Error Code 3.76 Transmission Error between Centralized Controller and Indoor Unit Applicable All indoor unit models Models Central remote 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 424 Troubleshooting by Error Code SiUS372201EA 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 425 SiUS372201EA 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 426: System Not Set Yet

    Troubleshooting by Error Code SiUS372201EA 3.77 System Not Set Yet Applicable All indoor unit models Models All outdoor unit models Error Code Except on wrong wiring detection operation. During wrong wiring detection operation, refer to page 233. 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 427: System Abnormality, Refrigerant System Address Undefined

    SiUS372201EA Troubleshooting by Error Code 3.78 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. Detection *Automatic address refers to the automatic designated address of indoor unit and outdoor unit when connected to the power after installation or wiring replacement (with the RETURN (BS3)
  • Page 428 Troubleshooting by Error Code SiUS372201EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Does electricity an error occur being introduced even after 12 minutes for the first time after elapses from the time when Normal installation or after an indoor...

  • Page 429: Climate Talk Communication System Combination Error (Before Initial Setting For Communication Completes)

    SiUS372201EA Troubleshooting by Error Code 3.79 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 430: Climate Talk Communication System Combination Error (After Initial Setting For Communication Completes)

    Troubleshooting by Error Code SiUS372201EA 3.80 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 431: Check

    SiUS372201EA Check 4. Check High Pressure Check CHECK 1 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Stop valve closed Check to be sure the stop valve is open. Local High pipe Bent or crashed pipe pressure Conduct visual checks for pipe conditions.

  • Page 432: Low Pressure Check

    Check SiUS372201EA 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 433 SiUS372201EA Check Reference CHECK 7 Refer to page 432. Reference CHECK 8 Refer to page 433. Part 6 Service Diagnosis...

  • Page 434: Superheat Operation Check

    Check SiUS372201EA 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 435 SiUS372201EA Check 4. Judgment criteria of superheat operation: (1) Suction gas superheating degree: 10°C (18°F) and over. (2) Discharge gas superheating degree: 45°C (81°F) and over, except immediately after compressor starts up or is running under dropping control. (Use the above values as a guide. Depending on the other conditions, the unit may be normal despite the values within the above range.) Reference CHECK 7 Refer to page 432.

  • Page 436: Power Transistor Check

    Check SiUS372201EA 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. Preparation  Prepare the analog type of multimeter. h Multimeter For the digital type of multimeter, those with diode check function are available for the checking.
  • Page 437 SiUS372201EA Check  REYQ72AATJ*, REYQ144/168AATJ* (M2C), REYQ192/216/240AATJ* (M1C, M2C) 230 V 160P  REYQ-AAYD* 460 V 1P/16P Part 6 Service Diagnosis...

  • Page 438: Refrigerant Overcharge Check

    Check SiUS372201EA 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 439: Refrigerant Shortage Check

    SiUS372201EA Check Refrigerant Shortage Check CHECK 7 In case of VRV Systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgement, refer to the information below. Diagnosis of shortage of refrigerant 1.

  • Page 440: Vacuuming And Dehydration Procedure

    Check SiUS372201EA 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 441: Thermistor Check

    SiUS372201EA Check Thermistor Check CHECK 11 Thermistor type of indoor units Indoor heat Indoor heat Suction air Discharge air exchanger (liquid) exchanger (gas) thermistor thermistor Model thermistor thermistor FXFQ-T Type C Type J — FXZQ-TA — Type B FXZQ-TB — Type A FXUQ-P —...
  • Page 442 Check SiUS372201EA Thermistor temperature Resistance (k) (°C) (°F) Type A Type B Type C –30 –22 363.8 — — –25 –13 266.8 — — –20 –4 197.8 — — –15 148.2 — — –10 112.0 111.1 111.8 –5 85.52 84.95 85.42 65.84 65.53...
  • Page 443 SiUS372201EA Check Thermistor temperature Resistance (k) (°C) (°F) Type H Type J Type N –30 –22 3407 352.1 363.4 –25 –13 2540 261.2 266.7 –20 –4 1910 195.4 197.8 –15 1449 147.3 148.2 –10 1108 111.8 112.1 –5 853.8 85.49 85.51 662.7 65.80...

  • Page 444: Pressure Sensor Check

    Check SiUS372201EA Pressure Sensor Check CHECK 12 Detected Pressure 4.15 4.15 (MPa) = × V – × 0.5 (psi) (kg/cm (MPa) (MPa) = × V – × 0.5 51.0 1 MPa = 145 psi : High pressure (MPa) 45.9 High Pressure (P : Low pressure (MPa) : Output Voltage (High Side) (VDC) 40.8...

  • Page 445: Broken Wire Check Of The Relay Wires

    SiUS372201EA Check 4.10 Broken Wire Check of the Relay Wires CHECK 15 1. Procedure for checking outdoor-outdoor unit transmission wiring for broken wires On the system shown below, turn OFF the power supply to all equipment, short circuit between the outdoor-outdoor unit terminal F1 and F2 in the "Outdoor Unit A" that is farthest from the central remote controller, and then conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the central remote controller using a multimeter.
  • Page 446 Check SiUS372201EA 1. Short circuit between the outdoor-outdoor unit terminal parts. Outdoor-outdoor unit 2. Short circuit between transmission wiring the indoor-outdoor unit 2. Check the transmission terminal parts. wiring for continuity. Indoor-outdoor unit If there is continuity, the transmission wiring indoor-outdoor unit transmission has no broken wires in it.

  • Page 447: Fan Motor Connector Check (Power Supply Cable)

    SiUS372201EA Check 4.11 Fan Motor Connector Check (Power Supply Cable) CHECK 16 Check the fan motor connector according to the following procedure. Indoor Unit FXDQ-M, FXHQ-M 1. Turn OFF the power supply. 2. Measure the resistance between phases of U, V, W at the motor side connectors (3-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.
  • Page 448 Check SiUS372201EA Outdoor Unit 1. Turn OFF the power supply. Measure the resistance between phases of U, V, W at the motor side connectors (3-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.

  • Page 449: Fan Motor Connector Check (Signal Cable)

    SiUS372201EA Check 4.12 Fan Motor Connector Check (Signal Cable) CHECK 17 Resistance measuring points and judgment criteria. Indoor Unit FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXSQ05-48TA, FXSQ05-48TB, FXMQ07-12PB, FXMQ15-24TB, FXAQ-P White Orange Brown Blue — — — — Judgment criteria Measuring points Criteria 1 ...
  • Page 450 Check SiUS372201EA FXSQ54TA, FXSQ54TB, FXMQ15-54PB, FXMQ30-54TB Gray (5) Pink (4) Orange (3) Blue (2) Yellow (1) Judgment criteria Measuring points Criteria 1  or more 5 - 4 1  or more 5 - 3 1  or more 5 - 2 1 ...

  • Page 451: Electronic Expansion Valve Coil Check

    SiUS372201EA Check 4.13 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. Determine the type according to the connector wire color and measure the resistance. Outdoor Unit Y1E, Y2E, Y4E, Y5E, Y3E (REYQ72AA) White (1)
  • Page 452 Check SiUS372201EA Indoor Unit FXFQ-T, FXZQ-TA, FXZQ-TB, FXUQ-P, FXUQ-PA, FXEQ-P, FXSQ-TA, FXSQ-TB, FXMQ-TB, FXTQ-TA, CXTQ-TA Orange (1) Red (2) Yellow (3) Black (4) — (5) Gray (6) Measuring points Judgment criteria 1 - 6 2 - 6 35-55  3 - 6 4 - 6 FXMQ-PB, FXAQ-P White (1)
  • Page 453 SiUS372201EA Check Branch Selector unit (EVSC) White (1) White (1) White Yellow (2) Yellow (2) Orange (3) Orange (3) Orange Blue (4) Blue (4) — (5) Red (5) Yellow — Blue Red (6) Measuring points Judgment criteria White - Red Yellow - Red 35-55 ...

  • Page 454: Fan Motor Connector Check For Fxtq-Ta

    Check SiUS372201EA 4.14 Fan Motor Connector Check for FXTQ-TA CHECK 19 CHECKING EMERSON ULTRATECH ECM MOTORS The FXTQ-TA models utilize an Emerson, 4-wire variable speed ECM blower motor. The ECM blower motor provides constant CFM. The motor is a serially communicating variable speed motor. Only four wires are required to control the motor: +Vdc, Common, Receive, and Transmit.
  • Page 455 SiUS372201EA Check The green LED on the diagnostic tool will blink indicating communications between the tool and motor. See table below for indications of tool indicators and motor actions. Replace or repair as needed. Power Green Motor Indication(s) Button Action Confirm 24VAC to UltraCheck-EZ tool.
  • Page 456 Check SiUS372201EA 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 457 SiUS372201EA Check Locate the 3-circuit connector in the control/end bell. Using an ohmmeter, check the resistance between each terminal in the connector. If the resistance is 1 M or greater, the control/end bell is functioning properly. Replace the control/end bell if the resistance is lower than 1 M.
  • Page 458 SiUS372201EA Part 7 Appendix 1. Wiring Diagrams..................452 1.1 Outdoor Unit ..................... 452 1.2 Branch Selector Unit ................454 1.3 Indoor Unit....................463 1.4 Air Treatment Equipment ................. 481 2. Electrical Component Box Removal............484 Part 7 Appendix...

  • Page 459: Wiring Diagrams

    SiUS372201EA Wiring Diagrams 1. Wiring Diagrams Outdoor Unit REYQ72/96/120/144/168/192/216/240AATJA Part 7 Appendix...
  • Page 460 Wiring Diagrams SiUS372201EA REYQ72/96/120/144/168/192/216/240AAYDA Part 7 Appendix...

  • Page 461: Branch Selector Unit

    SiUS372201EA Wiring Diagrams Branch Selector Unit 1.2.1 Single Branch Selector Unit BSQ36/60/96TVJ Part 7 Appendix...
  • Page 462 Wiring Diagrams SiUS372201EA BSQ36/60/96TAVJ Part 7 Appendix...
  • Page 463 SiUS372201EA Wiring Diagrams 1.2.2 Multi Branch Selector Unit (Standard Series) BS4Q54TVJ Part 7 Appendix...
  • Page 464 Wiring Diagrams SiUS372201EA BS4Q54TAVJ Part 7 Appendix...
  • Page 465 SiUS372201EA Wiring Diagrams BS6/8Q54TVJ Part 7 Appendix...
  • Page 466 Wiring Diagrams SiUS372201EA BS10/12Q54TVJ Part 7 Appendix...
  • Page 467 SiUS372201EA Wiring Diagrams BS10/12Q54TAVJ Part 7 Appendix...
  • Page 468 Wiring Diagrams SiUS372201EA 1.2.3 Multi Branch Selector Unit (Flex Series) BSF4Q54TVJ 3D123904A Part 7 Appendix...
  • Page 469 SiUS372201EA Wiring Diagrams BSF6/8Q54TVJ Part 7 Appendix...

  • Page 470: Indoor Unit

    Wiring Diagrams SiUS372201EA Indoor Unit FXFQ07/09/12/15/18/24/30/36/48TVJU* Part 7 Appendix...
  • Page 471 SiUS372201EA Wiring Diagrams BYCQ125BGW1 (Self-Cleaning Decoration Panel for FXFQ-TVJU*) Part 7 Appendix...
  • Page 472 Wiring Diagrams SiUS372201EA FXZQ05/07/09/12/15/18TAVJU* Part 7 Appendix...
  • Page 473 SiUS372201EA Wiring Diagrams FXZQ05/07/09/12/15/18TBVJU* Part 7 Appendix...
  • Page 474 Wiring Diagrams SiUS372201EA FXUQ18/24/30/36PVJU* Part 7 Appendix...
  • Page 475 SiUS372201EA Wiring Diagrams FXUQ18/24/30/36PAVJU* Part 7 Appendix...
  • Page 476 Wiring Diagrams SiUS372201EA FXEQ07/09/12/15/18/24PVJU* Part 7 Appendix...
  • Page 477 SiUS372201EA Wiring Diagrams FXDQ07/09/12/18/24MVJU* Part 7 Appendix...
  • Page 478 Wiring Diagrams SiUS372201EA FXSQ05/07/09/12/15/18/24/30/36/48/54TAVJU* Part 7 Appendix...
  • Page 479 SiUS372201EA Wiring Diagrams FXSQ05/07/09/12/15/18/24/30/36/48/54TBVJU Part 7 Appendix...
  • Page 480 Wiring Diagrams SiUS372201EA FXMQ07/09/12/15/18/24/30/36/48/54PBVJU* Part 7 Appendix...
  • Page 481 SiUS372201EA Wiring Diagrams FXMQ15/18/24/30/36/48/54TBVJU Part 7 Appendix...
  • Page 482 Wiring Diagrams SiUS372201EA FXMQ72/96MVJU* Part 7 Appendix...
  • Page 483 SiUS372201EA Wiring Diagrams FXHQ12/24/36MVJU* Part 7 Appendix...
  • Page 484 Wiring Diagrams SiUS372201EA FXAQ07/09/12/18/24PVJU* Part 7 Appendix...
  • Page 485 SiUS372201EA Wiring Diagrams FXLQ07/09/12/18/24MVJU*, FXNQ07/09/12/18/24MVJU* Part 7 Appendix...
  • Page 486 Wiring Diagrams SiUS372201EA FXTQ09/12/18/24/30/36/42/48/54/60TAVJUA(D)* Part 7 Appendix...
  • Page 487 SiUS372201EA Wiring Diagrams CXTQ24/36/48/60TASBLU* Part 7 Appendix...

  • Page 488: Air Treatment Equipment

    Wiring Diagrams SiUS372201EA Air Treatment Equipment 1.4.1 Outdoor-Air Processing Unit FXMQ48/72/96MFVJU* Part 7 Appendix...
  • Page 489 SiUS372201EA Wiring Diagrams 1.4.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU* Part 7 Appendix...
  • Page 490 Wiring Diagrams SiUS372201EA VAM1200GVJU* Part 7 Appendix...

  • Page 491: Electrical Component Box Removal

    SiUS372201EA Electrical Component Box Removal 2. Electrical Component Box Removal 1. Remove the screws. Screw (×3) 2. Lift the mounting plate up and fasten the hook. Part 7 Appendix...
  • Page 492 Electrical Component Box Removal SiUS372201EA 3. Remove the screws. 2-compressor Type Screw (×5) 1-compressor Type Screw (×3) Part 7 Appendix...
  • Page 493 SiUS372201EA Electrical Component Box Removal 4. Pull out the refrigerant jacket. θ θ max. = 110° Do not open more than 110° (The piping might crack when coming in contact with surrounding parts) Axis of rotation Part 7 Appendix...
  • Page 494 Electrical Component Box Removal SiUS372201EA 5. Remove the screws. Screw (×8) 6. Remove the electrical component box. Part 7 Appendix...
  • Page 495 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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