Daikin RXYQ-XA Series Service Manual
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Daikin RXYQ-XA Series Service Manual

Daikin RXYQ-XA Series Service Manual

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Table of Contents

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Service
Manual
RXYQ72-408XATJA
RXYQ72-408XAYDA
Heat Pump 60 Hz
SiUS342003E

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Summary of Contents for Daikin RXYQ-XA Series

  • Page 1 SiUS342003E Service Manual RXYQ72-408XATJA RXYQ72-408XAYDA Heat Pump 60 Hz...
  • Page 2 SiUS342003E RXYQ-XA Series Heat Pump R-410A 60 Hz 1. Safety Cautions..................vii 1.1 Warnings and Cautions Regarding Safety of Workers........ vii 1.2 Warnings and Cautions Regarding Safety of Users........ix 2. Icons Used ....................xii Part 1 General Information .............. 1 1.
  • Page 3 SiUS342003E 3. Refrigerant Flow for Each Operation Mode..........54 3.1 RXYQ72XATJA, RXYQ72XAYDA.............. 54 3.2 RXYQ96/120XATJA, RXYQ96/120XAYDA..........58 3.3 RXYQ144/168XATJA, RXYQ144/168XAYDA..........62 Part 3 Remote Controller ............... 66 1. Applicable Models ..................67 2. Names and Functions ................68 2.1 BRC1E73 ....................68 2.2 Wireless Remote Controller ............... 71 3.
  • Page 4 SiUS342003E 6.5 Inverter Protection Control ................. 99 6.6 Heating Operation Prohibition ..............100 7. Special Control..................101 7.1 Pump Down Residual Operation .............. 101 7.2 Outdoor Unit Rotation................101 7.3 Oil Return Operation ................103 7.4 Defrost Operation ..................104 7.5 Drain Pan Heater (Option)................
  • Page 5 SiUS342003E 3.3 Check Work Prior to Turn Power Supply ON ........... 191 3.4 Turn Power ON ..................192 3.5 Gas Furnace Test Operation..............193 Part 6 Service Diagnosis.............. 194 1. Symptom-based Troubleshooting ............197 1.1 Indoor Unit Overall ................... 197 1.2 With Gas Furnace ..................
  • Page 6 SiUS342003E 3.34 Activation of Low Pressure Sensor ............263 3.35 Compressor Motor Lock ................264 3.36 Compressor Damage Alarm ..............266 3.37 Outdoor Fan Motor Abnormality ............... 268 3.38 Electronic Expansion Valve Coil Abnormality........... 271 3.39 Discharge Pipe Temperature Abnormality ..........273 3.40 Wet Alarm....................
  • Page 7 SiUS342003E 3.75 Climate Talk Communication System Combination Error (After Initial Setting for Communication Completes) ........ 338 4. Check ...................... 339 4.1 High Pressure Check ................339 4.2 Low Pressure Check ................340 4.3 Superheat Operation Check..............342 4.4 Power Transistor Check ................344 4.5 Refrigerant Overcharge Check..............

  • Page 8: Warnings And Cautions Regarding Safety Of Workers

    Safety Cautions SiUS342003E 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 9 SiUS342003E Safety Cautions 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 10: Warnings And Cautions Regarding Safety Of Users

    Safety Cautions SiUS342003E Caution Be sure to conduct repair work with appropriate tools. The use of inappropriate tools may cause injury. 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.
  • Page 11 SiUS342003E Safety Cautions Warning Be sure to use the specified cable for wiring between the indoor and outdoor units. Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals. Improper connections may cause excessive heat generation or fire.
  • Page 12 Safety Cautions SiUS342003E Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks.

  • Page 13: Icons Used

    SiUS342003E Icons Used 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning A Warning is used when there is danger of personal injury. Warning Caution A Caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, loose data, get Caution...

  • Page 14: Table Of Contents

    SiUS342003E Part 1 General Information 1. Model Names ....................2 1.1 Indoor Unit....................2 1.2 Outdoor Unit ....................2 1.3 Air Treatment Equipment ................3 2. External Appearance................... 4 2.1 Indoor Unit....................4 2.2 Outdoor Unit ....................5 2.3 Air Treatment Equipment ................5 3.

  • Page 15: Model Names

    SiUS342003E Model Names 1. Model Names Indoor Unit Capacity range (ton) 1.25 Power supply, Capacity index Standard Ceiling mounted cassette FXFQ — 07T 09T 12T 15T 18T — 24T 30T 36T — — — — — (Round flow with sensing) type VISTA™...

  • Page 16: Air Treatment Equipment

    Model Names SiUS342003E Combination of RXYQ-XATJA Model name RXYQ72XATJA RXYQ96XATJA RXYQ120XATJA RXYQ144XATJA RXYQ168XATJA Outdoor unit 1 RXYQ72XATJA RXYQ96XATJA RXYQ120XATJA RXYQ144XATJA RXYQ168XATJA Model name RXYQ192XATJA RXYQ216XATJA RXYQ240XATJA RXYQ264XATJA RXYQ288XATJA Outdoor unit 1 RXYQ72XATJA RXYQ96XATJA RXYQ120XATJA RXYQ120XATJA RXYQ144XATJA Outdoor unit 2 RXYQ120XATJA RXYQ120XATJA RXYQ120XATJA RXYQ144XATJA...

  • Page 17: External Appearance

    SiUS342003E External Appearance 2. External Appearance Indoor Unit Ceiling mounted cassette (Round flow with sensing) type Ceiling mounted duct type FXFQ-T FXMQ-M Shown with BYCQ125B-W1 VISTA™ 2’×2’ cassette type Ceiling suspended type FXZQ-TA FXHQ-M Shown with BYFQ60C3W1W Shown with BYFQ60C3W1S 4 way blow ceiling suspended type Wall mounted type FXUQ-P...

  • Page 18: Outdoor Unit

    External Appearance SiUS342003E Outdoor Unit Single Outdoor Unit RXYQ72XA RXYQ96/120/144/168XA Double Outdoor Unit RXYQ192XA RXYQ216/240/264/288/312/336XA Triple Outdoor Unit RXYQ360/384/408XA Air Treatment Equipment Outdoor-air processing unit Energy recovery ventilator (VAM series) FXMQ-MF VAM-G General Information...

  • Page 19: Combination Of Outdoor Units

    SiUS342003E Combination of Outdoor Units 3. Combination of Outdoor Units System capacity Module Number Outdoor Unit Multi Connection Piping Kit of units — BHFP22P100U BHFP22P100UA BHFP22P151U BHFP22P151UA Note: 1 For multiple connection, the outdoor unit multi connection piping kit (separately sold) is required. General Information...

  • Page 20: Capacity Range

    Capacity Range SiUS342003E 4. Capacity Range Combination Ratio Total capacity index of the indoor units Combination ratio = Capacity index of the outdoor units Max. combination ratio Types of connected indoor units Type of connected air treatment equipments Min. When using When using at FXMQ-MF Type...

  • Page 21: Specifications

    SiUS342003E Specifications 5. Specifications RXYQ-XATJA Model name RXYQ72XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 72,000 (21.1) Btu/h 1 Cooling capacity (kW) Rated 69,000 (20.2) Nominal 81,000 (23.7) Btu/h 2 Heating capacity (kW) Rated 73,000 (21.4) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 22 Specifications SiUS342003E Model name RXYQ96XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 96,000 (28.1) Btu/h 1 Cooling capacity (kW) Rated 92,000 (27.0) Nominal 108,000 (31.7) Btu/h 2 Heating capacity (kW) Rated 103,000 (30.2) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 23 SiUS342003E Specifications Model name RXYQ120XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 120,000 (35.2) Btu/h 1 Cooling capacity (kW) Rated 114,000 (33.4) Nominal 135,000 (39.6) Btu/h 2 Heating capacity (kW) Rated 129,000 (37.8) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 24 Specifications SiUS342003E Model name RXYQ144XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 144,000 (42.2) Btu/h 1 Cooling capacity (kW) Rated 138,000 (40.4) Nominal 162,000 (47.5) Btu/h 2 Heating capacity (kW) Rated 154,000 (45.1) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 25 SiUS342003E Specifications Model name RXYQ168XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 164,000 (48.1) Btu/h 1 Cooling capacity (kW) Rated 158,000 (46.3) Nominal 188,000 (55.1) Btu/h 2 Heating capacity (kW) Rated 174,000 (51.0) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 26 Specifications SiUS342003E Model name (Combination unit) RXYQ192XATJA RXYQ72XATJA Model name (Independent unit) RXYQ120XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 192,000 (56.3) Btu/h 1 Cooling capacity (kW) Rated 184,000 (53.9) Nominal 216,000 (63.3) Btu/h 2 Heating capacity (kW) Rated 206,000 (60.4) Casing color...
  • Page 27 SiUS342003E Specifications Model name (Combination unit) RXYQ216XATJA RXYQ96XATJA Model name (Independent unit) RXYQ120XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 216,000 (63.3) Btu/h 1 Cooling capacity (kW) Rated 206,000 (60.4) Nominal 243,000 (71.2) Btu/h 2 Heating capacity (kW) Rated 230,000 (67.4) Casing color...
  • Page 28 Specifications SiUS342003E Model name (Combination unit) RXYQ240XATJA RXYQ120XATJA Model name (Independent unit) RXYQ120XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 240,000 (70.3) Btu/h 1 Cooling capacity (kW) Rated 228,000 (66.8) Nominal 270,000 (79.1) Btu/h 2 Heating capacity (kW) Rated 256,000 (75.0) Casing color...
  • Page 29 SiUS342003E Specifications Model name (Combination unit) RXYQ264XATJA RXYQ120XATJA Model name (Independent unit) RXYQ144XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 264,000 (77.4) Btu/h 1 Cooling capacity (kW) Rated 252,000 (73.9) Nominal 297,000 (87.0) Btu/h 2 Heating capacity (kW) Rated 282,000 (82.6) Casing color...
  • Page 30 Specifications SiUS342003E Model name (Combination unit) RXYQ288XATJA RXYQ144XATJA Model name (Independent unit) RXYQ144XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 288,000 (84.4) Btu/h 1 Cooling capacity (kW) Rated 274,000 (80.3) Nominal 324,000 (95.0) Btu/h 2 Heating capacity (kW) Rated 308,000 (90.3) Casing color...
  • Page 31 SiUS342003E Specifications Model name (Combination unit) RXYQ312XATJA RXYQ144XATJA Model name (Independent unit) RXYQ168XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 312,000 (91.4) Btu/h 1 Cooling capacity (kW) Rated 296,000 (86.7) Nominal 351,000 (102.9) Btu/h 2 Heating capacity (kW) Rated 334,000 (97.9) Casing color...
  • Page 32 Specifications SiUS342003E Model name (Combination unit) RXYQ336XATJA RXYQ168XATJA Model name (Independent unit) RXYQ168XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 326,000 (95.5) Btu/h 1 Cooling capacity (kW) Rated 312,000 (91.4) Nominal 378,000 (110.8) Btu/h 2 Heating capacity (kW) Rated 342,000 (100.2) Casing color...
  • Page 33 SiUS342003E Specifications Model name (Combination unit) RXYQ360XATJA RXYQ120XATJA Model name (Independent unit) RXYQ120XATJA RXYQ120XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 360,000 (105.5) Btu/h 1 Cooling capacity (kW) Rated 342,000 (100.2) Nominal 405,000 (118.7) Btu/h 2 Heating capacity (kW) Rated 372,000 (109.0)
  • Page 34 Specifications SiUS342003E Model name (Combination unit) RXYQ384XATJA RXYQ96XATJA Model name (Independent unit) RXYQ120XATJA RXYQ168XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 368,000 (107.9) Btu/h 1 Cooling capacity (kW) Rated 356,000 (104.3) Nominal 432,000 (126.6) Btu/h 2 Heating capacity (kW) Rated 396,000 (116.1)
  • Page 35 SiUS342003E Specifications Model name (Combination unit) RXYQ408XATJA RXYQ96XATJA Model name (Independent unit) RXYQ144XATJA RXYQ168XATJA Power supply 3 phase, 208/230 V, 60 Hz Nominal 390,000 (114.3) Btu/h 1 Cooling capacity (kW) Rated 372,000 (109.0) Nominal 459,000 (134.5) Btu/h 2 Heating capacity (kW) Rated 424,000 (124.3)

  • Page 36: Rxyq-Xayda

    Specifications SiUS342003E RXYQ-XAYDA Model name RXYQ72XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 72,000 (21.1) Btu/h 1 Cooling capacity (kW) Rated 69,000 (20.2) Nominal 81,000 (23.7) Btu/h 2 Heating capacity (kW) Rated 73,000 (21.4) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 37 SiUS342003E Specifications Model name RXYQ96XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 96,000 (28.1) Btu/h 1 Cooling capacity (kW) Rated 92,000 (27.0) Nominal 108,000 (31.7) Btu/h 2 Heating capacity (kW) Rated 103,000 (30.2) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 38 Specifications SiUS342003E Model name RXYQ120XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 120,000 (35.2) Btu/h 1 Cooling capacity (kW) Rated 114,000 (33.4) Nominal 135,000 (39.6) Btu/h 2 Heating capacity (kW) Rated 129,000 (37.8) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 39 SiUS342003E Specifications Model name RXYQ144XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 144,000 (42.2) Btu/h 1 Cooling capacity (kW) Rated 138,000 (40.4) Nominal 162,000 (47.5) Btu/h 2 Heating capacity (kW) Rated 154,000 (45.1) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 40 Specifications SiUS342003E Model name RXYQ168XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 164,000 (48.1) Btu/h 1 Cooling capacity (kW) Rated 158,000 (46.3) Nominal 188,000 (55.1) Btu/h 2 Heating capacity (kW) Rated 174,000 (51.0) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 41 SiUS342003E Specifications Model name (Combination unit) RXYQ192XAYDA RXYQ72XAYDA Model name (Independent unit) RXYQ120XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 192,000 (56.3) Btu/h 1 Cooling capacity (kW) Rated 184,000 (53.9) Nominal 216,000 (63.3) Btu/h 2 Heating capacity (kW) Rated 206,000 (60.4) Casing color...
  • Page 42 Specifications SiUS342003E Model name (Combination unit) RXYQ216XAYDA RXYQ96XAYDA Model name (Independent unit) RXYQ120XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 216,000 (63.3) Btu/h 1 Cooling capacity (kW) Rated 206,000 (60.4) Nominal 243,000 (71.2) Btu/h 2 Heating capacity (kW) Rated 230,000 (67.4) Casing color...
  • Page 43 SiUS342003E Specifications Model name (Combination unit) RXYQ240XAYDA RXYQ120XAYDA Model name (Independent unit) RXYQ120XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 240,000 (70.3) Btu/h 1 Cooling capacity (kW) Rated 228,000 (66.8) Nominal 270,000 (79.1) Btu/h 2 Heating capacity (kW) Rated 256,000 (75.0) Casing color...
  • Page 44 Specifications SiUS342003E Model name (Combination unit) RXYQ264XAYDA RXYQ120XAYDA Model name (Independent unit) RXYQ144XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 264,000 (77.4) Btu/h 1 Cooling capacity (kW) Rated 252,000 (73.9) Nominal 297,000 (87.0) Btu/h 2 Heating capacity (kW) Rated 282,000 (82.6) Casing color...
  • Page 45 SiUS342003E Specifications Model name (Combination unit) RXYQ288XAYDA RXYQ144XAYDA Model name (Independent unit) RXYQ144XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 288,000 (84.4) Btu/h 1 Cooling capacity (kW) Rated 274,000 (80.3) Nominal 324,000 (95.0) Btu/h 2 Heating capacity (kW) Rated 308,000 (90.3) Casing color...
  • Page 46 Specifications SiUS342003E Model name (Combination unit) RXYQ312XAYDA RXYQ144XAYDA Model name (Independent unit) RXYQ168XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 312,000 (91.4) Btu/h 1 Cooling capacity (kW) Rated 296,000 (86.7) Nominal 351,000 (102.9) Btu/h 2 Heating capacity (kW) Rated 334,000 (97.9) Casing color...
  • Page 47 SiUS342003E Specifications Model name (Combination unit) RXYQ336XAYDA RXYQ168XAYDA Model name (Independent unit) RXYQ168XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 326,000 (95.5) Btu/h 1 Cooling capacity (kW) Rated 312,000 (91.4) Nominal 378,000 (110.8) Btu/h 2 Heating capacity (kW) Rated 342,000 (100.2) Casing color...
  • Page 48 Specifications SiUS342003E Model name (Combination unit) RXYQ360XAYDA RXYQ120XAYDA Model name (Independent unit) RXYQ120XAYDA RXYQ120XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 360,000 (105.5) Btu/h 1 Cooling capacity (kW) Rated 342,000 (100.2) Nominal 405,000 (118.7) Btu/h 2 Heating capacity (kW) Rated 372,000 (109.0)
  • Page 49 SiUS342003E Specifications Model name (Combination unit) RXYQ384XAYDA RXYQ96XAYDA Model name (Independent unit) RXYQ120XAYDA RXYQ168XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 368,000 (107.9) Btu/h 1 Cooling capacity (kW) Rated 356,000 (104.3) Nominal 432,000 (126.6) Btu/h 2 Heating capacity (kW) Rated 396,000 (116.1)
  • Page 50 Specifications SiUS342003E Model name (Combination unit) RXYQ408XAYDA RXYQ96XAYDA Model name (Independent unit) RXYQ144XAYDA RXYQ168XAYDA Power supply 3 phase, 460 V, 60 Hz Nominal 390,000 (114.3) Btu/h 1 Cooling capacity (kW) Rated 372,000 (109.0) Nominal 459,000 (134.5) Btu/h 2 Heating capacity (kW) Rated 424,000 (124.3)
  • Page 51 SiUS342003E Part 2 Refrigerant Circuit 1. Refrigerant Circuit ..................39 1.1 Outdoor Unit ....................39 1.2 Indoor Unit....................45 1.3 Outdoor-Air Processing Unit............... 47 2. Functional Parts Layout ................48 2.1 RXYQ72XATJA ..................48 2.2 RXYQ96/120XATJA ................... 49 2.3 RXYQ144/168XATJA ................. 50 2.4 RXYQ72XAYDA ..................

  • Page 52: Refrigerant Circuit Part

    Refrigerant Circuit SiUS342003E 1. Refrigerant Circuit Outdoor Unit 1.1.1 RXYQ72XATJA, RXYQ72XAYDA No. in Electric piping Name Function symbol diagram Compressor Inverter driven compressor is operated in multi-steps according to Te. Because the system is an air heat exchange type, the fan is operated at 10-step rotation Inverter fan speed by using the inverter.
  • Page 53 SiUS342003E Refrigerant Circuit Refrigerant Circuit...
  • Page 54 Refrigerant Circuit SiUS342003E 1.1.2 RXYQ96/120XATJA, RXYQ96/120XAYDA No. in Electric piping Name Function symbol diagram Compressor Compressor is operated in multi-steps according to Te. Because the system is an air heat exchange type, the fan is operated at 10-step rotation Inverter fan speed by using the inverter.
  • Page 55 SiUS342003E Refrigerant Circuit Refrigerant Circuit...
  • Page 56 Refrigerant Circuit SiUS342003E 1.1.3 RXYQ144/168XATJA, RXYQ144/168XAYDA No. in Electric piping Name Function symbol diagram Compressor Compressor is operated in multi-steps according to Te. Because the system is an air heat exchange type, the fan is operated at 10-step rotation Inverter fan speed by using the inverter.
  • Page 57 SiUS342003E Refrigerant Circuit Refrigerant Circuit...

  • Page 58: Indoor Unit

    Refrigerant Circuit SiUS342003E Indoor Unit Symbol Except No. in piping Name Function FXMQ-PB, FXTQ-TA, diagram FXMQ-PB FXTQ-TA, CXTQ-TA CXTQ-TA Used for gas superheating degree control while Electronic expansion in cooling or subcooling degree control while in valve heating. Suction air thermistor R1T (∗1) Used for thermostat control.
  • Page 59 SiUS342003E Refrigerant Circuit FXMQ-PB FXTQ-TA Gas piping connection port Indoor heat exchanger Liquid piping connection port Filter Filter C: 4D034245R C: 4D068194 CXTQ-TA Gas piping connection port Indoor heat exchanger Liquid piping connection port Filter Filter Refrigerant Circuit...

  • Page 60: Outdoor-Air Processing Unit

    Refrigerant Circuit SiUS342003E Outdoor-Air Processing Unit 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 Electric piping Name Function symbol diagram Used to control the flow rate of refrigerant, and make the Electronic expansion valve SH control (∗1) while in cooling.

  • Page 61: Functional Parts Layout

    SiUS342003E Functional Parts Layout 2. Functional Parts Layout RXYQ72XATJA Top View Solenoid valve (Oil return) (Y3S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Low pressure sensor (S1NPL) Thermistor (Subcooling heat exchanger gas pipe) (R6T) Thermistor (Heat exchanger liquid pipe) (R4T) Front View Inverter fan...

  • Page 62: Rxyq96/120Xatja

    Functional Parts Layout SiUS342003E RXYQ96/120XATJA Top View Solenoid valve (Oil return) (Y3S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Thermistor (Subcooling heat exchanger liquid pipe) (R5T) Thermistor (Discharge pipe) (R21T) Front View Inverter fan (M2F) Inverter fan Thermistor (Outdoor air) (M1F) (R1T) High pressure sensor...

  • Page 63: Rxyq144/168Xatja

    SiUS342003E Functional Parts Layout RXYQ144/168XATJA Top View Solenoid valve (Oil return 1) Solenoid valve (Oil return 2) (Y3S) (Y4S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Thermistor (Subcooling heat exchanger liquid pipe) (R5T) Thermistor (M2C discharge pipe) Thermistor (M1C discharge pipe) (R22T) (R21T) Front View...

  • Page 64: Rxyq72Xayda

    Functional Parts Layout SiUS342003E RXYQ72XAYDA Top View Solenoid valve (Oil return) (Y3S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Low pressure sensor (S1NPL) Thermistor (Subcooling heat exchanger gas pipe) (R6T) Front View Inverter fan (M1F) High pressure sensor Solenoid valve (Four way valve) (S1NPH) (Y1S)

  • Page 65: Rxyq96/120Xayda

    SiUS342003E Functional Parts Layout RXYQ96/120XAYDA Top View Solenoid valve (Oil return) (Y3S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Thermistor (Subcooling heat exchanger liquid pipe) (R5T) Thermistor (Discharge pipe) (R21T) Front View Inverter fan (M2F) Inverter fan Thermistor (Outdoor air) (M1F) (R1T) High pressure sensor...

  • Page 66: Rxyq144/168Xayda

    Functional Parts Layout SiUS342003E RXYQ144/168XAYDA Top View Solenoid valve (Oil return 1) Solenoid valve (Oil return 2) Thermistor (Accumulator inlet) (Y3S) (Y4S) (R3T) Electronic expansion valve (Injection) (Y2E) Thermistor (Subcooling heat exchanger liquid pipe) (R5T) Thermistor (M2C discharge pipe) Thermistor (M1C discharge pipe) (R22T) (R21T) Front View...

  • Page 67: Refrigerant Flow For Each Operation Mode

    SiUS342003E Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode RXYQ72XATJA, RXYQ72XAYDA 3.1.1 Cooling Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger...

  • Page 68: Cooling Oil Return Operation

    Refrigerant Flow for Each Operation Mode SiUS342003E 3.1.2 Cooling Oil Return Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal EV: Normal control...

  • Page 69: Defrost Operation

    SiUS342003E Refrigerant Flow for Each Operation Mode 3.1.3 Defrost Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan OFF Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 224 pulse EV: 224 pulse...

  • Page 70: Heating Operation

    Refrigerant Flow for Each Operation Mode SiUS342003E 3.1.4 Heating operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan LL Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 192 pulse EV: 192 pulse...

  • Page 71: Rxyq96/120Xatja, Rxyq96/120Xayda

    SiUS342003E Refrigerant Flow for Each Operation Mode RXYQ96/120XATJA, RXYQ96/120XAYDA 3.2.1 Cooling Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 0 pulse...
  • Page 72 Refrigerant Flow for Each Operation Mode SiUS342003E 3.2.2 Cooling Oil Return Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal EV: Normal EV: 224 pulses...
  • Page 73 SiUS342003E Refrigerant Flow for Each Operation Mode 3.2.3 Defrost Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan OFF Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 224 pulse EV: 224 pulse...
  • Page 74 Refrigerant Flow for Each Operation Mode SiUS342003E 3.2.4 Heating Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan LL Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 192 pulse EV: 192 pulse...

  • Page 75: Rxyq144/168Xatja, Rxyq144/168Xayda

    SiUS342003E Refrigerant Flow for Each Operation Mode RXYQ144/168XATJA, RXYQ144/168XAYDA 3.3.1 Cooling Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 0 pulse...
  • Page 76 Refrigerant Flow for Each Operation Mode SiUS342003E 3.3.2 Cooling Oil Return Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal EV: Normal EV: 224 pulses...
  • Page 77 SiUS342003E Refrigerant Flow for Each Operation Mode 3.3.3 Defrost Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan OFF Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 224 pulse EV: 224 pulse...
  • Page 78 Refrigerant Flow for Each Operation Mode SiUS342003E 3.3.4 Heating Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan LL Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 192 pulse EV: 192 pulse...
  • Page 79 SiUS342003E Part 3 Remote Controller 1. Applicable Models ..................67 2. Names and Functions ................68 2.1 BRC1E73 ....................68 2.2 Wireless Remote Controller ............... 71 3. Main/Sub Setting..................72 3.1 BRC1E73 ....................72 3.2 When Wireless Remote Controller is Used Together......... 73 4.

  • Page 80: Applicable Models

    Applicable Models SiUS342003E 1. Applicable Models Wired remote controller Wireless remote Series controller Navigation FXFQ-T – BRC082A42W (for BYFQ60C3W1W) FXZQ-TA BRC082A42S (for BYFQ60C3W1S) BRC082A41W (for BYFQ60B3W1) FXUQ-P – FXEQ-P FXDQ-M BRC4C82 FXSQ-TA BRC082A43 BRC1E73 BRC4C82 (Fan: 2 steps) FXMQ-PB BRC082A43 (Fan: 3 steps) FXMQ-M BRC4C82 FXHQ-M...

  • Page 81: Names And Functions

    SiUS342003E 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 82 Names and Functions SiUS342003E 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 83: Service Check Function

    SiUS342003E 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 84: Wireless Remote Controller

    Names and Functions SiUS342003E 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 85: Main/Sub Setting

    SiUS342003E 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. Setting The remote controllers are factory setting to Main, so you only have to change one remote controller from Main to Sub.

  • Page 86: When Wireless Remote Controller Is Used Together

    Main/Sub Setting SiUS342003E 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 controller when power is turned ON Change the setting from Sub to Main on the remote controller you want to be Main.

  • Page 87: Address Setting For Wireless Remote Controller

    SiUS342003E Address Setting for Wireless Remote Controller 4. Address Setting for Wireless Remote Controller If setting multiple wireless remote controllers to operate in one room, perform address setting for the receiver and the wireless remote controller. (This includes an individual remote controller control using the group operation.) (For the wiring for the group operation, please refer to the installation manual attached to the indoor unit and technical guide.) Setting for signal receiver PCB...
  • Page 88 Address Setting for Wireless Remote Controller SiUS342003E Setting for wireless remote controller The address for the wireless remote controller is set to 1 at the factory. To change the setting, proceed as follows: 1. Press FILTER SIGN RESET button and INSPECTION/TEST button at the same time for 4 seconds to enter field setting mode.

  • Page 89: Centralized Control Group No. Setting

    SiUS342003E Centralized Control Group No. Setting 5. Centralized Control Group No. Setting BRC1E73 In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller. Make Group No.
  • Page 90 Centralized Control Group No. Setting SiUS342003E Note: 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 91: Wireless Remote Controller

    SiUS342003E Centralized Control Group No. Setting Wireless Remote Controller Group No. setting by wireless remote controller for centralized control 1. When in the normal mode, press INSPECTION/TEST button for 4 seconds or more to enter field setting mode. 2. Set mode No. 00 with MODE button. 3.

  • Page 92: Group No. Setting Example

    Centralized Control Group No. Setting SiUS342003E Group No. Setting Example Central Remote Controller Indoor/Outdoor Outdoor/Outdoor Indoor/Outdoor Outdoor/Outdoor F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 Group Control by Remote Controller Main 1-00...

  • Page 93: Service Settings Menu, Maintenance Menu

    SiUS342003E Service Settings Menu, Maintenance Menu 6. Service Settings Menu, Maintenance Menu BRC1E73 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press and hold the Press the Cancel Cancel button button once.

  • Page 94: Service Settings Menu

    Service Settings Menu, Maintenance Menu SiUS342003E 6.1.1 Service Settings Menu Service settings menu Item 2 Item 3 Test Operation — — Maintenance Contact None — Maintenance Contact —, 0 to 9 (in order) Field Settings Indoor Unit No. — Mode No. —...

  • Page 95: Maintenance Menu

    SiUS342003E Service Settings Menu, Maintenance Menu 6.1.2 Maintenance Menu Maintenance Menu Item 2 Remarks Model Name Unit No. Select the unit number you want to check. Indoor unit The model names are displayed. (A model code may be displayed instead, Outdoor unit depending on the particular model.) Operation Hours...
  • Page 96 Service Settings Menu, Maintenance Menu SiUS342003E Maintenance Menu Item 2 Remarks Forced Defrost Forced defrost ON Enables the forced defrost operation. Forced defrost OFF Disables the forced defrost operation. Error Display Display error ON Displays the error on the screen. Display error OFF Displays neither errors nor warnings.
  • Page 97 SiUS342003E Part 4 Functions and Control 1. Operation Flowchart (Outdoor Unit) ............86 2. Stop Control ....................87 2.1 Stop due to Error ..................87 2.2 When System is in Stop Control..............87 2.3 Slave Unit Stops during Master Unit Operation.......... 87 3.
  • Page 98 SiUS342003E 8.9 Hot Start Control (In Heating Only) ............122 8.10 Louver Control for Preventing Ceiling Dirt..........123 8.11 Heater Control (Except FXTQ-TA Models)..........124 8.12 Heater Control (FXTQ-TA Models)............125 8.13 Gas Furnace Control (CXTQ-TA Models) ..........128 8.14 3-Step Thermostat Processing (FXTQ-TA Models) ......... 129 8.15 Fan Control (Heater Residual) (FXTQ-TA Models) ........

  • Page 99: Operation Flowchart (Outdoor Unit)

    SiUS342003E Operation Flowchart (Outdoor Unit) 1. Operation Flowchart (Outdoor Unit) Stop control (1) Stop due to error (2) When system is in stop control (3) Slave unit stops during master unit operation Special control Standby control (1) Restart standby (2) Crankcase heater control (1) Pump down residual operation (note 2) Thermostat ON...

  • Page 100: Stop Control

    Stop Control SiUS342003E 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 Code and Description"...

  • Page 101: Standby Control

    SiUS342003E Standby Control 3. Standby Control Restart Standby Used to forcedly stop the compressor for a period of 3 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 melting of the refrigerant to the evaporator.

  • Page 102: Startup Control

    Startup Control SiUS342003E 4. Startup Control This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. To avoid stresses to the compressor due to oil return or else after the startup, the following control is made and the position of the four way valve is also determined.

  • Page 103: Startup Control In Heating

    SiUS342003E Startup Control Startup Control in Heating Frequency step up 5 sec. interval Frequency RXYQ72XA RXYQ96/120XA (Hz) RXYQ144/168XA +12 Hz/20 sec. Compressor 1 0 Hz (M1C) +12 Hz/20 sec. Compressor 2 0 Hz (M2C) ∗ RXYQ144/168XA only T(Ta–Te)control Initial opening Electronic expansion 0 pulse valve (main)

  • Page 104: Basic Control

    Basic Control SiUS342003E 5. Basic Control Normal Control Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature DSH: Discharge pipe superheating degree Cooling Electric Part Name RXYQ72-120XA RXYQ144/168XA Function of Functional Part Symbol PI control, Compressor 1 High pressure protection, Low pressure protection,...

  • Page 105: Compressor Capacity Control

    SiUS342003E Basic Control Compressor Capacity Control Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature Capacity steps The compressor rotation speed is changed according to the control pressure. Cooling: suction pressure sensor value is converted into evaporating saturated temperature (relation between pressure and evaporating temperature based on characteristics of refrigerant R-410A).

  • Page 106: Operating Priority And Rotation Of Compressors

    Basic Control SiUS342003E Operating Priority and Rotation of Compressors Each compressor operates in the following order of priority. In the case of multi-outdoor-unit system, each compressor operates in Pattern 1 to Pattern 3 according to the rotation of outdoor units. M1C: Compressor 1 M2C: Compressor 2 Pattern 1...

  • Page 107: Compressor Step Control

    SiUS342003E Basic Control Compressor Step Control The actual rotation speed per second of the compressor (rps) depends on the type of compressor: XATJA XAYDA Compressor Actual rotation speed 96/120 144/168 96/120 144/168 JT100GCVDKW rps = frequency/2 – – – – JT150JBVDW rps = frequency/3 –...

  • Page 108: Step Control Of Outdoor Fans

    Basic Control SiUS342003E Step Control of Outdoor Fans Used to control the revolutions of outdoor unit fans in the steps listed in table below, according to condition changes. Fan revolutions (rpm) Step RXYQ96/120XA RXYQ144/168XA RXYQ72XA Cooling: 821 1136 1106 Heating: 800 Cooling: 821 1097 1067...

  • Page 109: Protection Control

    SiUS342003E Protection Control 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. Cooling The following control is performed in the entire system.

  • Page 110: Low Pressure Protection Control

    Protection Control SiUS342003E Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. Cooling Because of common low pressure, the following control is performed in the system. Normal control Pe: Low pressure sensor detection Pe <...

  • Page 111: Discharge Pipe Protection Control

    SiUS342003E 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. The following control is performed for each compressor of single unit as well as multi units. Compressor Normal control Discharge pipe...

  • Page 112: Inverter Protection Control

    Protection Control SiUS342003E 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. Inverter overcurrent protection control This control is performed for each compressor.

  • Page 113: Heating Operation Prohibition

    SiUS342003E Protection Control Heating Operation Prohibition When outdoor air temperature becomes high, outdoor unit cannot perform heating because: Low pressure sensor can give pressure value above upper limit of sensor: error JC. Mechanical internal load on compressor increases. Low compression ratio can result in insufficient compressor internal oil lubrication. Heating is disabled when outdoor air temperature raises above 26°C (78.8°F).

  • Page 114: Special Control

    Special Control SiUS342003E 7. Special Control Pump Down Residual Operation Pc : High pressure sensor detection value Pe : Low pressure sensor detection value To avoid refrigerant emigration when outdoor unit stops operation (thermostat or safety), all electronic expansion valves are closed. Outdoor Unit Rotation In the case of multi-outdoor-unit system, this outdoor unit rotation is used to prevent the compressor from breaking down due to unbalanced oil level between outdoor units.
  • Page 115 SiUS342003E Special Control Example) The following diagram shows outdoor unit rotation in combination of 3 outdoor units. Startup Oil return control operation or Normal control Normal control defrost operation Master Slave 1 Slave 2 Master Slave 1 Slave 2 Outdoor unit Outdoor unit Priority Priority...

  • Page 116: Oil Return Operation

    Special Control SiUS342003E 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 Ts1: Suction pipe temperature detected by thermistor R3T 7.3.1 Oil Return Operation in Cooling...

  • Page 117: Defrost Operation

    SiUS342003E Special Control Defrost Operation To defrost the outdoor heat exchanger while in evaporator, the defrost operation is conducted to recover the heating capacity. Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature Starting Conditions Defrost operation is not conducted before 40 minutes have elapsed from the start of heating operation.

  • Page 118: Outline Of Control (Indoor Unit)

    Outline of Control (Indoor Unit) SiUS342003E 8. Outline of Control (Indoor Unit) Operation Flowchart Cooling Operation Start (Option) Turn ON Aux. electric : OFF ∗4 power supply heater Humidifier : OFF Initialize electronic expansion valve Swing flap Detect louver lock prevention condition? The previous settings of airflow LED in remote...
  • Page 119 SiUS342003E 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 120 Outline of Control (Indoor Unit) SiUS342003E Heating Operation Drain : OFF pump kit Swing flap? ∗13 ∗13 Set wind direction Swing flap Is test run in progress? ∗18 defrost conditions for gas operation in furnace operation Depends on the intensity progress? established? of gas combustion.
  • Page 121 SiUS342003E Outline of Control (Indoor Unit) ∗4. The control of auxiliary electric heater connected to FXTQ-TA models differ from this flowchart. For details, refer to Heater Control (FXTQ-TA Models) on page 125. ∗5. If the evaporator inlet temperature is kept at not more than –5°C (23°F) for a period of cumulative 10 min.

  • Page 122: Set Temperature And Control Temperature

    Outline of Control (Indoor Unit) SiUS342003E Set Temperature and Control Temperature 8.2.1 Without Optional Infrared Presence/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 123: With Optional Infrared Presence/Floor Sensor

    SiUS342003E Outline of Control (Indoor Unit) 8.2.2 With Optional Infrared Presence/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 124: Remote Controller Thermistor

    Outline of Control (Indoor Unit) SiUS342003E 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: When fresh air intake kit is used, outdoor air is mixed with indoor air, and the room temperature...
  • Page 125 SiUS342003E Outline of Control (Indoor Unit) Heating When heating, the hot air rises to the top of the room, resulting in the temperature being lower near the floor where the occupants are. When controlling by suction air thermistor only, the indoor unit may therefore be turned off by the thermostat before the lower part of the room reaches the set temperature.

  • Page 126: Thermostat Control

    Outline of Control (Indoor Unit) SiUS342003E Thermostat Control 8.4.1 Without Optional Infrared Presence/Floor Sensor Whether the thermostat is turned on or off is determined by the difference between the remote controller set temperature and the actual detected room temperature (∗1). Normal operation ·...
  • Page 127 SiUS342003E Outline of Control (Indoor Unit) 8.4.2 With Optional Infrared Presence/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 ∆T ≤...

  • Page 128: Thermostat Control With Operation Mode Set To Auto

    Outline of Control (Indoor Unit) SiUS342003E 8.4.3 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. Second code No.

  • Page 129: Drain Pump Control

    SiUS342003E Outline of Control (Indoor Unit) Drain Pump Control 8.5.1 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 130 Outline of Control (Indoor Unit) SiUS342003E 8.5.3 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 131: Control Of Electronic Expansion Valve

    SiUS342003E 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 132: Freeze-Up Prevention

    Outline of Control (Indoor Unit) SiUS342003E Freeze-up Prevention Freeze-up Prevention by Off Cycle (Indoor Unit Individual Control) 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 133 SiUS342003E Outline of Control (Indoor Unit) Note: When the indoor unit is FXFQ-T, FXZQ-TA or FXUQ-P, 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 134: List Of Swing Flap Operations

    Outline of Control (Indoor Unit) SiUS342003E List of Swing Flap Operations Swing flaps operate as shown in table below. Flap FXFQ-T FXEQ-P FXHQ-M FXAQ-P Swing Horizontal Horizontal Horizontal Horizontal Hot start from defrost operation Airflow direction set Horizontal Horizontal Horizontal Horizontal Swing Horizontal...

  • Page 135: Hot Start Control (In Heating Only)

    SiUS342003E Outline of Control (Indoor Unit) Hot Start Control (In Heating 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 136: Louver Control For Preventing Ceiling Dirt

    Outline of Control (Indoor Unit) SiUS342003E 8.10 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 137: Heater Control (Except Fxtq-Ta Models)

    SiUS342003E Outline of Control (Indoor Unit) 8.11 Heater Control (Except FXTQ-TA Models) Note: Optional PCB KRP1B ... is required. The heater control is conducted in the following manner. Normal control While in heating, the heater control (ON/ Set temperature OFF) is conducted as shown on the right. 2˚C 2˚C (3.6˚F)

  • Page 138: Heater Control (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS342003E 8.12 Heater Control (FXTQ-TA Models) Note: 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 139 SiUS342003E 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 140 Outline of Control (Indoor Unit) SiUS342003E 8.12.2 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 141: Gas Furnace Control (Cxtq-Ta Models)

    SiUS342003E Outline of Control (Indoor Unit) 8.13 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 142: 3-Step Thermostat Processing (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS342003E 8.14 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 125.

  • Page 143: Fan Control (Heater Residual) (Fxtq-Ta Models)

    SiUS342003E Outline of Control (Indoor Unit) 8.15 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 144 Outline of Control (Indoor Unit) SiUS342003E 8.16.3 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 145 SiUS342003E Part 5 Field Settings and Test Operation 1. Field Settings for Indoor Unit..............133 1.1 Field Settings with Remote Controller ............133 1.2 Wireless Remote Controller ..............135 1.3 Simplified Remote Controller..............136 1.4 List of Field Settings for Indoor Unit ............137 1.5 Gas Furnace Set Up.................

  • Page 146: Field Settings For Indoor Unit

    Field Settings for Indoor Unit SiUS342003E 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. Wrong setting may cause error.
  • Page 147 SiUS342003E 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 148: Wireless Remote Controller

    Field Settings for Indoor Unit SiUS342003E Wireless Remote Controller UP button Mode No. Field setting mode DOWN button RESERVE button First code No. MODE button Second code No. INSPECTION/TEST button To set the field settings, you have to change: Mode No. First code No.

  • Page 149: Simplified Remote Controller

    SiUS342003E Field Settings for Indoor Unit Simplified Remote Controller Mode No. First code Unit No. Second code No. (2)(8) (7) (4) (5) (6) 1. Remove the upper part of remote controller. 2. When in the normal mode, press the BS6 button (2) (field setting) to enter the field setting mode. 3.

  • Page 150: List Of Field Settings For Indoor Unit

    Field Settings for Indoor Unit SiUS342003E List of Field Settings for Indoor Unit : Factory setting Mode First Second Code No. Code Setting Contents (∗2) Approx. Approx. Ultra long life 10,000 5,000 filter hrs. hrs. Approx. Approx. Filter cleaning sign interval Light Heavy —...
  • Page 151 SiUS342003E Field Settings for Indoor Unit Mode First Second Code No. Code Setting Contents (∗2) Optional kit setting (UV lamp + humidifier + Refer to page 153 for details. economizer) Set temperature: Set temperature: Residential dry same as cooling set —...
  • Page 152 Field Settings for Indoor Unit SiUS342003E 1.4.1 Applicable Range of Field setting First Field Code Setting Modes FXFQ-T FXZQ-TA FXUQ-P FXEQ-P FXDQ-M FXSQ-TA FXMQ-PB setting Filter cleaning sign interval Filter sign setting — — — — — — — Filter type —...
  • Page 153 SiUS342003E Field Settings for Indoor Unit First Field Code Setting Modes FXMQ-M FXHQ-M FXAQ-P FXLQ-M FXNQ-M FXTQ-TA CXTQ-TA setting Filter cleaning sign interval — — Filter sign setting — — — — — Filter type — — — — — —...

  • Page 154: Detailed Explanation Of Setting Modes

    Field Settings for Indoor Unit SiUS342003E 1.4.2 Detailed Explanation of Setting Modes Filter Cleaning Sign Interval, Filter Type 10 (20)-1 01: Long life filter 02: Ultra long life filter Setting Filter contamination heavy/light Light Heavy Light Heavy 10 (20)-0 FXFQ-T FXZQ-TA FXUQ-P FXEQ-P...
  • Page 155 SiUS342003E Field Settings for Indoor Unit FXTQ-TA, CXTQ-TA Mode No. First Code No. Second Code No. Contents — 10 (20) Remote sensor thermistor only Remote controller thermistor only When the Second Code No. is set to 02, room temperature is controlled by the remote sensor thermistor. When the Second Code No.
  • Page 156 Field Settings for Indoor Unit SiUS342003E Note that the control is automatically switched to the one performed only by the suction air thermistor for indoor unit when the Second code No. is 01 during group control. To use the remote controller thermostat control during group control, select the Second code No. 02 in First code No.
  • Page 157 SiUS342003E Field Settings for Indoor Unit Auxiliary Electric Heater ON/OFF Temperature Thermostat Set temperature Thermostat Toff + S(∗1) Ton + S (∗1) Note: ∗1. S value varies automatically based on the room temperature trend. FXFQ-T, FXMQ-PB Second Code No. Mode No. First Code No.
  • Page 158 Field Settings for Indoor Unit SiUS342003E CXTQ-TA Second Code No. Mode No. First Code No. Symbol 07 (∗1) –4°C –3.5°C –3°C –2.5°C –2°C –1.5°C –100°C (–7.2°F) (–6.3°F) (–5.4°F) (–4.5°F) (–3.6°F) (–2.7°F) (–148°F) 11 (21) –2°C –1.5°C –1°C –0.5°C 0°C 0.5°C –98°C Toff (–3.6°F)
  • Page 159 SiUS342003E Field Settings for Indoor Unit Electric Heater Capacity Setting (for FXTQ-TA model) Second Code No. First Mode Model Code Heater (kW) heater kit FXTQ09TAVJUA — — — — — — — FXTQ09TAVJUD — — — — — — — FXTQ12TAVJUA —...
  • Page 160 Field Settings for Indoor Unit SiUS342003E Automatic Airflow Adjustment The volume of blow-off air is automatically adjusted to the rated quantity. Make settings before performing the test operation of the outdoor unit. Setting procedure (1) Make sure that electric wiring and duct construction have been completed. In particular, if the closing damper is installed on the way of the duct, make sure that it is open.
  • Page 161 SiUS342003E Field Settings for Indoor Unit Compensating the Floor Temperature (For units with the infrared presence/floor sensor only) Offset the detected value of the infrared floor sensor with a certain temperature. This setting should be used to have the actual floor temperature detected when, for example, the unit is installed close to a wall. Mode No.
  • Page 162 Field Settings for Indoor Unit SiUS342003E 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, 1.0°C (1.8°F) FXEQ-P, FXHQ-M, FXTQ-TA FXDQ-M, FXMQ-PB, FXAQ-P,...
  • Page 163 SiUS342003E Field Settings for Indoor Unit Due to the aforementioned, when the "Auto restart after power failure” setting is ON, be careful for the following situations that may occur. Caution 1. The air conditioner will start operation suddenly after power failure, or when the main power supply is restored.
  • Page 164 Field Settings for Indoor Unit SiUS342003E FXZQ-TA, FXEQ-P First Code Second Mode No. Contents Ceiling height Code No. 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 Mode No.
  • Page 165 SiUS342003E Field Settings for Indoor Unit External Static Pressure Settings FXMQ-PB models Mode No. First Code No. Second Code No. Contents 30 Pa (0.12 inWG) (∗1) (∗3) 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) 100 Pa (0.40 inWG) 13 (23)
  • Page 166 Field Settings for Indoor Unit SiUS342003E Optional Kit Setting (UV lamp + Humidifier + Economizer) (for FXTQ-TA and CXTQ-TA models) Contents Economizer setting for Mode No. First Code No. Second Code No. UV lamp + humidifier fan Mech standby duration speed (minutes) Refer to controller...
  • Page 167 SiUS342003E Field Settings for Indoor Unit Humidification when Heating Thermostat is OFF Setting to "Humidification Setting" turns ON the humidifier if suction air temperature is 20°C (68°F) or above and turns OFF the humidifier if suction air temperature is 18°C (64.4°F) or below when the heating thermostat is OFF. Mode No.
  • Page 168 Field Settings for Indoor Unit SiUS342003E Setting "Restricted/Permitted" of Airflow Block (For units with the infrared presence/floor sensor only) Due to possibility of dew condensation, the airflow block function cannot be enabled when closure material kit, fresh air intake kit, natural/separately installed evaporation humidifier, or branch air duct is equipped. This setting will prevent the airflow block is advertently set to ON.

  • Page 169: Gas Furnace Set Up

    SiUS342003E 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 170: List Of Field Settings For Outdoor-Air Processing Unit

    Field Settings for Indoor Unit SiUS342003E List of Field Settings for Outdoor-Air Processing Unit : Factory setting First Second Code No. Mode Setting Contents Code Filter 2500 hr 1250 hr — — — — — — — — — — —...
  • Page 171 SiUS342003E 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 172: Field Settings For Outdoor Unit

    Field Settings for Outdoor Unit SiUS342003E 2. Field Settings for Outdoor Unit This section shows a list of field setting items possible to set at time of initial startup. For details of DIP switch setting, setting mode ("mode 2") and monitoring mode ("mode 1"), refer to information on one after the following page onwards.
  • Page 173 SiUS342003E Field Settings for Outdoor Unit Setting item Contents and objective of setting Overview of setting procedure Setting of demand To limit power consumption: upper limit set Use the optional board “DTA104A61”. operation on the compressor operating frequency. Wire external signal(s) to the optional Demand 1: % current limit 1.

  • Page 174: Settings By Dip Switches

    Field Settings for Outdoor Unit SiUS342003E Settings by DIP Switches 2.2.1 COOL/HEAT Selection For factory mounted board only use DIP switch DS1-1 if required. DIP switch Setting item Description Setting Used to choose source to select Cooling/Heating/fan COOL/HEAT DS1-1 only. Source can be or indoor remote controller, or select OFF (Factory setting) optional cool/heat switch wired to option “BRP2A81”.
  • Page 175 SiUS342003E Field Settings for Outdoor Unit 2.2.2 DIP Switch Setting Mounting a Spare PCB Caution: After replacement with spare PCB, be sure to make settings shown in the table on the following page. The procedure for making settings of spare PCB is different from that used for factory settings described above.
  • Page 176 Field Settings for Outdoor Unit SiUS342003E The figure below shows the required position of the DIP switches on spare PCB for RXYQ-XA. Change DIP switches at time of power disconnected. Application model The setting method ( represents the position of switches) RXYQ72XA Set DS1-2, DS1-4 and DS2-2 to ON.

  • Page 177: Accessing The Bs Buttons On The Pcb

    SiUS342003E Field Settings for Outdoor Unit Accessing the BS Buttons on the PCB It is not required to open the complete control box to access the BS buttons on the PCB and read out the seven- segment display (s). To access you can remove the service window cover (see figure). Now you can open the inspection door of the control box cover (see figure).

  • Page 178: Settings By Bs Buttons

    Field Settings for Outdoor Unit SiUS342003E Settings by BS Buttons The following settings can be made using the BS buttons on the PCB. In case of a multi outdoor system, make these settings with the master outdoor unit (settings made with a slave unit are disabled).
  • Page 179 SiUS342003E Field Settings for Outdoor Unit Selection between normal mode, monitor mode (Mode 1) and setting mode (Mode 2). SEG1 SEG2 SEG3 Normal mode MODE (BS1) button for more than 5 sec. Press MODE (BS1) button once. Press (Initial condition) Setting mode (Mode 2) Monitor mode (Mode 1) Select a setting item with...

  • Page 180: Normal Mode

    Field Settings for Outdoor Unit SiUS342003E Normal Mode 1. Indoor/outdoor transmission status: Used to check for the initial status of indoor/outdoor transmission. SEG1 SEG2 SEG3 Blinking Initializing Initializing completed 2. Descriptions: Used to display an error content. SEG1 SEG2 SEG3 Normal Example: E3-01 Error...

  • Page 181: Monitor Mode (Mode 1)

    SiUS342003E Field Settings for Outdoor Unit Monitor Mode (Mode 1) In the monitor mode, information can be retrieved about settings related to performance, addresses, number of units and actual operation data. 2.6.1 Retrieve Data by Using BS Button Outdoor Unit Main PCB SEG1 SEG2 SEG3 Normal To enter monitor mode, press the...
  • Page 182 Field Settings for Outdoor Unit SiUS342003E 2.6.2 Overview of Monitor Mode (Mode 1) Monitoring item Data display 7 segment display Contents 7 segment display ∗1 Item SEG 1 SEG 2 SEG 3 SEG 1 SEG 2 SEG 3 Undefined Master unit Master/slave outdoor unit Slave 1 unit Slave 2 unit...
  • Page 183 SiUS342003E Field Settings for Outdoor Unit Monitoring item Data display 7 segment display 7 segment display ∗1 Item Contents SEG 1 SEG 2 SEG 3 SEG 1 SEG 2 SEG 3 Description of retry (latest) Description of retry Refer to information in Check for Descriptions (1 cycle before) of Errors/Retries on page 171.
  • Page 184 Field Settings for Outdoor Unit SiUS342003E 2.6.3 Check for Descriptions of Errors/Retries Follow the procedure described below. This procedure is different than indicated in previous “Monitor mode”. The error codes for forced stop outdoor or retry are item: 17, 18, 19: description of error (outdoor system stopped operation). 23, 24, 25: description of retry.

  • Page 185: Setting Mode (Mode 2)

    SiUS342003E Field Settings for Outdoor Unit Setting Mode (Mode 2) SEG1 SEG2 SEG3 Press and hold the MODE (BS1) button for 5 seconds or more and set to Setting mode. Normal MODE Selection of setting items Press the SET (BS2) button and set the 7 segment display to a setting item shown in the table below.
  • Page 186 Field Settings for Outdoor Unit SiUS342003E 2.7.1 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 Range Item Description Description ∗1 COOL/HEAT Several systems as 1 zone change over selection...
  • Page 187 SiUS342003E Field Settings for Outdoor Unit 7 segment 7 segment display display Item Description Description Range ∗1 26 Automatic night- Time to start automatic “night-time low About 8:00PM time low noise noise” operation. (“Night-time low noise” About 10:00PM operation start level setting should also be made.) About 12:00AM 27 Automatic night-...
  • Page 188 Field Settings for Outdoor Unit SiUS342003E 7 segment 7 segment display display Item Description Description Range ∗1 38 Emergency To prohibit a compressor or complete in operation “Master”. Since module is permanent Master INV. 1 OFF (master) disabled, immediately replace the Master INV.
  • Page 189 SiUS342003E Field Settings for Outdoor Unit 7 segment 7 segment display display Item Description Description Range ∗1 94 Heat pump Heat pump is locked out when the outdoor –26.1°C (–15°F) lockout air temperature is smaller than the heat –23.3°C (–10°F) temperature pump lockout temperature.
  • Page 190 Field Settings for Outdoor Unit SiUS342003E 2.7.2 Details of Setting Mode (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 191 SiUS342003E Field Settings for Outdoor Unit [2-2]: Low noise/demand address Address for low noise/demand operation. 1 or more systems (maximum 10 systems wired by “F1F2 OUT/D”) can operate use the LNO (Low Noise Operation) or/and the DE (Demand Control) by instruction of field supplied input to optional PCB DTA104A61/62.
  • Page 192 Field Settings for Outdoor Unit SiUS342003E [2-12]: Enable the night-time low noise function and/or power consumption limitation via external control adaptor (DTA104A61/62) If the system needs to be running under night-time low noise operation or under power consumption limitation conditions when an external signal is sent to the unit, this setting should be changed. This setting will only be effective when the optional external control adaptor (DTA104A61/62) is installed.
  • Page 193 SiUS342003E Field Settings for Outdoor Unit [2-22]: Automatic night-time low noise setting and level during night time By changing this setting, you can activate the automatic night-time low noise operation function of the unit and define the level of operation. Depending on the chosen level, the noise level will be lowered (3: Level 3 <...
  • Page 194 Field Settings for Outdoor Unit SiUS342003E [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 195 SiUS342003E Field Settings for Outdoor Unit Next time graph shows the different steps during the power transistor check mode. Switching sequence during power transistor check mode: Power transistor check mode RXYQ-XA disconnect fasten U/V/W from compressor! step 2: Voltage Check 4 step1: Magnet mode 2 - code 28...
  • Page 196 Field Settings for Outdoor Unit SiUS342003E When operation parameters return to normal range, the capacity priority is switched OFF, enable to reduce airflow rate depending on night-time low noise operation is still required (end time for night-time low noise operation is not reached or external input night-time low noise operation is still closed). If capacity priority is set in Operation "Capacity priority setting", the fan...
  • Page 197 SiUS342003E Field Settings for Outdoor Unit [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 be running under power consumption limitation conditions, this setting activates and defines the level power consumption limitation that will be applied continuously.
  • Page 198 Field Settings for Outdoor Unit SiUS342003E [2-37]: Heat pump lockout 2 Heat pump is locked out when this setting and an external input to ABC terminal are made. Automatic lockout When this setting is made, the auto-backup function will automatically be activated. This will allow the auxiliary or secondary heat source to be automatically energized in the event of a system failure related to outdoor units.
  • Page 199 SiUS342003E Field Settings for Outdoor Unit [2-40]: Emergency operation “Slave 2” To disable permanent compressor operation of “Slave 2” unit of a multi outdoor system (RXYQ-XA): Default value: 0. Compressor operation enabled. Field setting: Set 1: inverter 1 compressor is disabled. Set 2: inverter 2 compressor is disabled.
  • Page 200 Field Settings for Outdoor Unit SiUS342003E [2-80]: Intermittent fan drive setting Default value: 0. Used for intermittent fan operation to assist snow discharge on outdoor fan. Value Intermittent fan operation [2-80] 0 (default) 30 minutes OFF, 1 minute ON with medium fan speed 30 minutes OFF, 1 minute ON with high fan speed [2-81]: Cooling comfort setting...
  • Page 201 SiUS342003E Field Settings for Outdoor Unit [2-90]: Indoor unit without power U4 error generation. In case an indoor unit needs maintenance or repair on the electric side, it is possible to keep the rest of the VRV DX indoor units operating without power supply to some indoor unit(s). Default value: 0 (not active) Field setting 1: It is possible to operate system without U4 error when some indoor units are temporarily without power supply.
  • Page 202 Field Settings for Outdoor Unit SiUS342003E [2-96]: Auxiliary heater maximum allowable temperature Auxiliary heater is allowed to energize when the ambient temperature is smaller than the auxiliary heater maximum allowable temperature. Value Auxiliary heater maximum allowable [2-97] temperature –17.7°C (0°F) –15°C (5°F) –12.2°C (10°F) –9.4°C (15°F)

  • Page 203: Test Operation

    SiUS342003E Test Operation 3. 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: (230 V or 460 V) ± 10% for 3-phase units Fully open the liquid and the gas stop valve.

  • Page 204: Check Work Prior To Turn Power Supply On

    Test Operation SiUS342003E Check Work Prior to Turn Power Supply ON Check that the installation work for the indoor and outdoor units has been performed in accordance with the instructions in the Installation Manual. • Is the wiring performed as specified? Check the below items.

  • Page 205: Turn Power On

    SiUS342003E Test Operation Turn Power ON • Be sure to turn the power ON 6 hours before starting operation to protect Turn outdoor unit and indoor compressors. (to power ON crankcase heater) unit power ON. • Check to be sure the transmission is normal. Check the 7 segment display of In a normal condition, the 7-segment display is OFF.

  • Page 206: Gas Furnace Test Operation

    Test Operation SiUS342003E 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 207 SiUS342003E Part 6 Service Diagnosis 1. Symptom-based Troubleshooting ............197 1.1 Indoor Unit Overall ................... 197 1.2 With Gas Furnace ..................200 1.3 Gas Furnace Lockout Reset..............200 1.4 With Optional Infrared Presence/Floor Sensor......... 201 2. Troubleshooting with Remote Controller..........202 2.1 Wired Remote Controller................
  • Page 208 SiUS342003E 3.33 Activation of High Pressure Switch ............261 3.34 Activation of Low Pressure Sensor ............263 3.35 Compressor Motor Lock ................264 3.36 Compressor Damage Alarm ..............266 3.37 Outdoor Fan Motor Abnormality ............... 268 3.38 Electronic Expansion Valve Coil Abnormality........... 271 3.39 Discharge Pipe Temperature Abnormality ..........
  • Page 209 SiUS342003E 3.75 Climate Talk Communication System Combination Error (After Initial Setting for Communication Completes) ........ 338 4. Check ...................... 339 4.1 High Pressure Check ................339 4.2 Low Pressure Check ................340 4.3 Superheat Operation Check..............342 4.4 Power Transistor Check ................344 4.5 Refrigerant Overcharge Check..............

  • Page 210: Symptom-Based Troubleshooting

    Symptom-based Troubleshooting SiUS342003E 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 211 SiUS342003E 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 select cooling operation. to select cooling operation. selection is CENTRAL CONTROL. disabled. The remote controller displays COOL/HEAT selection is made Use the COOL/HEAT selection using the COOL/HEAT selection...
  • Page 212 Symptom-based Troubleshooting SiUS342003E Symptom Supposed Cause Countermeasure 11 The system Indoor unit These are operating sounds of the Normal operation. produces Immediately after turning ON electronic expansion valve of the This sound becomes low after a sounds. the power supply, indoor unit indoor unit.

  • Page 213: With Gas Furnace

    SiUS342003E Symptom-based Troubleshooting With Gas Furnace Symptom Supposed Cause The gas furnace does not start operation while the compressor 1 The gas furnace does not start operation. is during operation or under stop-control, or right after defrost IN or defrost OUT. Wait until the operation becomes stable. This function is performed only with outdoor units which support automatic switching between gas furnace and heat pump Operation does not switch from heat pump to gas furnace in...

  • Page 214: With Optional Infrared Presence/Floor Sensor

    Symptom-based Troubleshooting SiUS342003E With Optional Infrared Presence/Floor Sensor Condition Measure 1 "Louver operation different from setting" or "No downward Refer to the following table. airflow in heating operation" 2 Individual airflow direction setting different from the actual · Check the "Louver operation different from setting" error airflow direction diagnosis.

  • Page 215: Troubleshooting With Remote Controller

    SiUS342003E Troubleshooting with Remote Controller 2. Troubleshooting with Remote Controller Wired Remote Controller 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 216: Wireless Remote Controller

    Troubleshooting with Remote Controller SiUS342003E Wireless Remote Controller If the unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit blinks. The error code can be determined by following the procedure described below. (The error code is displayed when an operation error has occurred.
  • Page 217 SiUS342003E Troubleshooting with Remote Controller The lower digit of the code changes as shown below. 0 1 2 3 4 5 6 7 8 9 A H C J E F "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 218: Troubleshooting By Error Code

    Troubleshooting by Error Code SiUS342003E 3. Troubleshooting by Error Code Error Codes and Descriptions k: ON h: OFF l: Blink Error code Operation Descriptions Reference lamp page Indoor Unit External protection device abnormality Indoor unit PCB abnormality Drain level control system abnormality Fan motor lock, overload Indoor fan motor abnormality Overload/overcurrent/lock of indoor fan motor...
  • Page 219 SiUS342003E Troubleshooting by Error Code k: ON h: OFF l: Blink Error code Operation Descriptions Reference lamp page Outdoor Unit Heat exchanger deicer thermistor (R7T) abnormality Subcooling heat exchanger liquid pipe thermistor (R5T) abnormality Heat exchanger liquid pipe thermistor (R4T) abnormality Subcooling heat exchanger gas pipe thermistor (R6T) abnormality High pressure sensor abnormality Low pressure sensor abnormality...

  • Page 220: Error Codes - Sub Codes

    Troubleshooting by Error Code SiUS342003E Error Codes - Sub Codes If an error code like the one shown below is displayed when the navigation remote controller (BRC1E series) is in use, make a detailed diagnosis or a diagnosis of the relevant unit. 3.2.1 Indoor Unit Troubleshooting Error code...

  • Page 221: Outdoor Unit

    SiUS342003E Troubleshooting by Error Code Troubleshooting Error code Description of error Diagnosis UH - 05 Climate Talk Communication system combination error (before initial setting for Refer to page 337. communication completes) UH - 06 Climate Talk Communication system combination error (after initial setting for Refer to page 338.
  • Page 222 Troubleshooting by Error Code SiUS342003E Troubleshooting Error code Description of error Diagnosis E7 - 01 Fan motor M1F lock (Master) E7 - 02 Fan motor M2F lock (Master) E7 - 05 Fan motor M1F momentary overcurrent (Master) E7 - 06 Fan motor M2F momentary overcurrent (Master) E7 - 09 Fan motor M1F IPM error (Master)
  • Page 223 SiUS342003E Troubleshooting by Error Code Troubleshooting Error code Description of error Diagnosis F4 - 01 Wet alarm F4 - 02 Wet alarm for compressor M1C (Master) F4 - 03 Wet alarm for compressor M2C (Master) F4 - 04 Wet alarm for compressor M1C (Slave 1) F4 - 05 Wet alarm for compressor M2C (Slave 1) F4 - 06...
  • Page 224 Troubleshooting by Error Code SiUS342003E Troubleshooting Error code Description of error Diagnosis Defective discharge pipe thermistor (R21T): J3 - 16 Open (Master) Defective discharge pipe thermistor (R21T): J3 - 17 Short (Master) Defective discharge pipe thermistor (R22T): J3 - 18 Open (Master) Defective discharge pipe thermistor (R22T): J3 - 19...
  • Page 225 SiUS342003E Troubleshooting by Error Code Troubleshooting Error code Description of error Diagnosis Defective subcooling heat exchanger liquid pipe J7 - 06 thermistor (R5T) (Master) Refer to the J7 flowchart and make a diagnosis of the Defective subcooling heat exchanger liquid pipe J7 - 07 relevant thermistor of the relevant unit based on the Error thermistor (R5T) (Slave 1)
  • Page 226 Troubleshooting by Error Code SiUS342003E Troubleshooting Error code Description of error Diagnosis L1 - 01 Instantaneous overcurrent - Compressor M1C (Master) L1 - 02 Defective current sensor 1 - Compressor M1C (Master) L1 - 03 Defective current sensor 2 - Compressor M1C (Master) L1 - 04 Defective power transistors - Compressor M1C (Master) L1 - 05...
  • Page 227 SiUS342003E Troubleshooting by Error Code Troubleshooting Error code Description of error Diagnosis Radiation fin temperature rise: Inverter PCB (A3P) L4 - 01 (Master) Radiation fin temperature rise: Inverter PCB (A3P) L4 - 02 (Slave 1) Radiation fin temperature rise: Inverter PCB (A3P) L4 - 03 (Slave 2) Refer to the L4 flowchart and make a diagnosis of the...
  • Page 228 Troubleshooting by Error Code SiUS342003E Troubleshooting Error code Description of error Diagnosis Transmission error (Between outdoor units, inverter PCB LC - 14 (A3P)) (Master) Transmission error (Between outdoor units, inverter PCB LC - 15 (A3P)) (Slave 1) Transmission error (Between outdoor units, inverter PCB LC - 16 (A3P)) (Slave 2) Transmission error (Between outdoor units, fan PCB)
  • Page 229 SiUS342003E Troubleshooting by Error Code Troubleshooting Error code Description of error Diagnosis Defective Radiation fin thermistor (Master: Inverter PCB P4 - 01 (A3P)) Defective Radiation fin thermistor (Slave 1: Inverter P4 - 04 PCB (A3P)) Defective Radiation fin thermistor (Slave 2: Inverter P4 - 05 Refer to the P4 flowchart and make a diagnosis of the PCB (A3P))
  • Page 230 Troubleshooting by Error Code SiUS342003E Troubleshooting Error code Description of error Diagnosis U2 - 01 Shortage of inverter 1 power supply voltage (Master) U2 - 02 Open phase of inverter 1 power supply (Master) Make a diagnosis of the relevant unit based on the U2 - 03 Defective capacitor in inverter 1 main circuit (Master) following.
  • Page 231 Branch selector unit connected Refer to the UA flowchart and make a diagnosis based on the Error code shown to the left. UA - 38 Daikin Altherma indoor unit detected UA - 39 Other hydrobox type than HXY-A unit detected UA - 50...

  • Page 232: External Protection Device Abnormality

    Troubleshooting by Error Code SiUS342003E External Protection Device Abnormality 3.3.1 External Protection Device Abnormality (All Indoor Unit Models) Error Code Applicable All indoor unit models Models 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 with the remote controller set to...

  • Page 233: Troubleshooting

    SiUS342003E Troubleshooting by Error Code 3.3.2 External Protection Device Abnormality (FXTQ-TA and CXTQ-TA Only) A0-01 Error Code Applicable FXTQ-TA, CXTQ-TA Models 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 Activation of external protection device...

  • Page 234: Indoor Unit Pcb Abnormality

    Troubleshooting by Error Code SiUS342003E Indoor Unit PCB Abnormality Error Code Applicable All indoor unit models Models 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 235: Drain Level Control System Abnormality

    SiUS342003E Troubleshooting by Error Code Drain Level Control System Abnormality Error Code Applicable FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXDQ-M, FXSQ-TA, FXMQ-PB Models 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 208~230 V power supply is not provided...
  • Page 236 Troubleshooting by Error Code SiUS342003E The drain pump works when Check the drain piping for the power supply is reset for clogging or upward slope, etc. the indoor unit. voltage of drain pump terminals (∗2) is 208- Replace the indoor unit control 230 V (within 5 minutes of PCB (A1P).

  • Page 237: Fan Motor Lock, Overload

    SiUS342003E Troubleshooting by Error Code Fan Motor Lock, Overload Error Code Applicable FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXSQ05-48TA, FXMQ07-12PB, FXAQ-P Models 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 Conditions Supposed Broken wires in, short circuit of, or disconnection of connectors from the fan motor harness...
  • Page 238 Troubleshooting by Error Code SiUS342003E 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. there any Remove the foreign matter.

  • Page 239: Indoor Fan Motor Abnormality

    SiUS342003E Troubleshooting by Error Code Indoor Fan Motor Abnormality 3.7.1 Indoor Fan Motor Abnormality (FXDQ-M, FXHQ-M Models) Error Code Applicable FXDQ-M, FXHQ-M Models Method of Error This error is detected if there is no revolutions 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 240 Troubleshooting by Error Code SiUS342003E 3.7.2 Indoor Fan Motor Abnormality (FXSQ54TA, FXMQ15-54PB Models) Error Code Applicable FXSQ54TA, FXMQ15-54PB Models Method of Error Error from the current flow on the fan PCB Detection Error from the rotation speed of the fan motor in operation Error from the position signal of the fan motor Error from the current flow on the fan PCB when the fan motor starting operation Error Decision...
  • Page 241 SiUS342003E 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 Remove the foreign matter. foreign matter around the fan.
  • Page 242 Troubleshooting by Error Code SiUS342003E 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 between GND and Hw, Replace the indoor fan motor (M1F).

  • Page 243: Overload/Overcurrent/Lock Of Indoor Fan Motor

    SiUS342003E Troubleshooting by Error Code Overload/Overcurrent/Lock of Indoor Fan Motor Error Code Applicable FXMQ-M Models Method of Error This error is detected by detecting that the individual power supply for the fan turns OFF. Detection Error Decision When it is not detected that the individual power supply for the indoor fan turns ON while in Conditions operation.

  • Page 244: Blower Motor Not Running

    Troubleshooting by Error Code SiUS342003E Blower Motor Not Running Error Code Applicable FXTQ-TA Models Outline Error is issued if the indoor unit determines that the indoor fan motor cannot rotate. Error Decision Determining successive abnormalities Checks the rotation speed at 5-second intervals using the feedback of the fan motor. Conditions If that figure falls below 50 rpm 5 times successively, it is deemed abnormal operation.

  • Page 245: Indoor Fan Motor Status Abnormality

    SiUS342003E Troubleshooting by Error Code 3.10 Indoor Fan Motor Status Abnormality A6-20 Error Code Applicable FXTQ-TA Models 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 246: Low Indoor Airflow

    Troubleshooting by Error Code SiUS342003E 3.11 Low Indoor Airflow A6-21 Error Code Applicable FXTQ-TA Models 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 Determining successive abnormalities Conditions...

  • Page 247: Swing Flap Motor Abnormality

    SiUS342003E Troubleshooting by Error Code 3.12 Swing Flap Motor Abnormality Error Code Applicable FXHQ-M, FXAQ-P Models 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 248 Troubleshooting by Error Code SiUS342003E The relay cable has no Replace the power supply continuity. relay cable. When the airflow direction flap-cam mechanism is disconnected Replace the defective from the swing motor, swing motor. (∗2) operation is normal when turned ON again.

  • Page 249: Power Supply Voltage Abnormality

    SiUS342003E Troubleshooting by Error Code 3.13 Power Supply Voltage Abnormality Error Code Applicable FXSQ-TA, FXMQ-PB Models Method of Error Error is detected by checking the input voltage of fan motor. Detection Error Decision When the input voltage of fan motor is 150 V or less, or 386 V or more. Conditions Supposed Defective power supply voltage...

  • Page 250: Blower Motor Stops For Over/Under Voltage

    Troubleshooting by Error Code SiUS342003E 3.14 Blower Motor Stops for Over/Under Voltage Error Code Applicable FXTQ-TA Models 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 251: Electronic Expansion Valve Coil Abnormality, Dust Clogging

    SiUS342003E Troubleshooting by Error Code 3.15 Electronic Expansion Valve Coil Abnormality, Dust Clogging Error Code Applicable All indoor unit models Models 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 252: Gas Furnace Abnormality

    Troubleshooting by Error Code SiUS342003E 3.16 Gas Furnace Abnormality AA-03 Error Code Applicable CXTQ-TA Models 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 253: Drain Level Above Limit

    SiUS342003E Troubleshooting by Error Code 3.17 Drain Level above Limit Error Code Applicable FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXDQ-M, FXSQ-TA, FXMQ-PB Models Method of Error Water leakage is detected based on float switch ON/OFF operation while the compressor is not in Detection operation.

  • Page 254: Capacity Determination Device Abnormality

    Troubleshooting by Error Code SiUS342003E 3.18 Capacity Determination Device Abnormality Error Code Applicable All indoor unit models Models 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 PCB, and whether the value is normal or abnormal is determined.

  • Page 255: Transmission Abnormality Between Indoor Unit Pcb And Fan Pcb

    SiUS342003E Troubleshooting by Error Code 3.19 Transmission Abnormality between Indoor Unit PCB and Fan PCB Error Code Applicable FXSQ-TA, FXMQ-PB Models Method of Error Transmission conditions between the indoor unit control PCB (A1P) and fan PCB (A2P) are checked via microcomputer. Detection Error Decision When normal transmission is not conducted for certain duration.
  • Page 256 Troubleshooting by Error Code SiUS342003E ∗1. Pull out and insert the connector once and check it is absolutely connected. Notes: ∗2. Method to check transmission part of indoor unit control PCB. (1) Turn OFF the power and remove the connector X70A of indoor unit PCB (A1P). (2) Short circuit X70A.

  • Page 257: Blower Motor Communication Error

    SiUS342003E Troubleshooting by Error Code 3.20 Blower Motor Communication Error C1-07 Error Code Applicable FXTQ-TA Models 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 258: Climate Talk Communication Error

    Troubleshooting by Error Code SiUS342003E 3.21 Climate Talk Communication Error C1-08 Error Code Applicable CXTQ-TA Models Method of Error Monitors the communication with the gas furnace connected to the Climate Talk Communication Detection terminal. Error Decision The error decision is made when the communication with the gas furnace is lost after once the initial setting for communication with the gas furnace completes.

  • Page 259: Thermistor Abnormality

    SiUS342003E Troubleshooting by Error Code 3.22 Thermistor Abnormality C4, C5, C9, CA Error Code Applicable C4, C5: All indoor units C9: except FXTQ-TA and CXTQ-TA models Models CA: FXMQ-PB models only Method of Error The error is detected by temperature detected by thermistor. Detection Error Decision The thermistor becomes disconnected or shorted while the unit is running.

  • Page 260: Combination Error Between Indoor Unit Control Pcb And Fan Pcb

    Troubleshooting by Error Code SiUS342003E 3.23 Combination Error between Indoor Unit Control PCB and Fan PCB Error Code Applicable FXSQ-TA, FXMQ-PB Models 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 261: Blower Motor Hp Mismatch

    SiUS342003E Troubleshooting by Error Code 3.24 Blower Motor HP Mismatch C6-01 Error Code Applicable FXTQ-TA Models 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 262: Indoor Blower Does Not Have Required Parameters To Function

    Troubleshooting by Error Code SiUS342003E 3.25 Indoor Blower Does Not Have Required Parameters to Function C6-02 Error Code Applicable FXTQ-TA Models 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 263: Remote Sensor Abnormality

    SiUS342003E Troubleshooting by Error Code 3.26 Remote Sensor Abnormality Error Code Applicable FXTQ-TA, CXTQ-TA Models Method of Error The error is detected by remote sensor temperature. Detection Error Decision The remote sensor becomes disconnected or shorted while the unit is running. Conditions Supposed Defective indoor unit thermistor (R1T) for room temperature...

  • Page 264: Humidity Sensor System Abnormality

    Troubleshooting by Error Code SiUS342003E 3.27 Humidity Sensor System Abnormality Error Code Applicable FXFQ-T Models 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 265: Infrared Presence/Floor Sensor Error

    SiUS342003E Troubleshooting by Error Code 3.28 Infrared Presence/Floor Sensor Error Error Code Applicable FXFQ-T, FXUQ-P Models Method of Error The contents of a failure vary with the detailed error code. Check the code and proceed with the Detection flowchart. Error Decision Error is detected based on sensor output signals Conditions Supposed...
  • Page 266 Troubleshooting by Error Code SiUS342003E Troubleshooting 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 (A4P) and the connector (∗1) normal? Is the connection of the Connect the connector correctly.
  • Page 267 SiUS342003E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 2 Infrared floor sensor error (Error code CE-02) Is the connection of the connector on infrared floor sensor Connect the connector correctly. PCB (A3P) and the connector (∗1) normal? Is the connection of the Connect the connector correctly.
  • Page 268 Troubleshooting by Error Code SiUS342003E Troubleshooting Diagnosis procedure 3 Infrared floor sensor error (Error code CE-03) Is the connection of the connector on infrared floor sensor Connect the connector correctly. PCB (A3P) and the connector (∗1) normal? Is the connection of the Connect the connector correctly.
  • Page 269 SiUS342003E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 4 Infrared floor sensor error (Error code CE-04) Is the connection of the connector on infrared floor sensor Connect the connector correctly. PCB (A3P) and the connector (∗1) normal? Is the connection of the Connect the connector correctly.

  • Page 270: Remote Controller Thermistor Abnormality

    Troubleshooting by Error Code SiUS342003E 3.29 Remote Controller Thermistor Abnormality Error Code Applicable All indoor unit models Models Method of Error Error detection is carried out by temperature detected by the remote controller thermistor. Detection Error Decision The remote controller thermistor becomes disconnected or shorted while the unit is running. ∗...

  • Page 271: Outdoor Unit Main Pcb Abnormality

    SiUS342003E Troubleshooting by Error Code 3.30 Outdoor Unit Main PCB Abnormality Error Code Applicable All outdoor unit models Models 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 272: Current Leakage Detection

    Troubleshooting by Error Code SiUS342003E 3.31 Current Leakage Detection Error Code Sub code: -01 to -03 Applicable All outdoor unit models Models Method of Error Current leakage is detected in the ground leakage detection circuit. Error is detected on the outdoor Detection unit main PCB.

  • Page 273: Missing Of Leakage Detection Core

    SiUS342003E Troubleshooting by Error Code 3.32 Missing of Leakage Detection Core Error Code Sub code: -06 to -08 Applicable All outdoor unit models Models Method of Error Detect error according to whether or not there is continuity across the connector (X101A). Detection Error Decision When no current flows at the time of turning ON the power supply.

  • Page 274: Activation Of High Pressure Switch

    Troubleshooting by Error Code SiUS342003E 3.33 Activation of High Pressure Switch Error Code Applicable All outdoor unit models Models 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: Operating pressure: 4.0 MPa (580 psi)
  • Page 275 SiUS342003E Troubleshooting by Error Code CHECK 12 Compare the voltage measurement of the connector of the pressure sensor Replace the high pressure sensor. (∗1) with the measurement of the pressure gauge. Are the (∗1) Use the table on CHECK 12 to convert characteristics of the high the voltage measurement into pressure...

  • Page 276: Activation Of Low Pressure Sensor

    Troubleshooting by Error Code SiUS342003E 3.34 Activation of Low Pressure Sensor Error Code Applicable All outdoor unit models Models 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 Operating pressure: 0.07 MPa (10.2 psi)

  • Page 277: Compressor Motor Lock

    SiUS342003E Troubleshooting by Error Code 3.35 Compressor Motor Lock Error Code Applicable All outdoor unit models Models 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 278 Troubleshooting by Error Code SiUS342003E The insulation resistance of the relevant Replace the compressor. ( 1) compressor is low ( 1) (< 100 kΩ) RXYQ72-120XA: M1C RXYQ144/168XA: M1C, M2C Power OFF The relevant compressor has a wiring disconnection in it. Restart the compressor, and then check for the...

  • Page 279: Compressor Damage Alarm

    SiUS342003E Troubleshooting by Error Code 3.36 Compressor Damage Alarm Error Code Applicable All outdoor unit models Models 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 280 Troubleshooting by Error Code SiUS342003E the high pressure and low 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 Replace the inverter PCB. Is the power transistor RXYQ72-120XA: A3P normal?

  • Page 281: Outdoor Fan Motor Abnormality

    SiUS342003E Troubleshooting by Error Code 3.37 Outdoor Fan Motor Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to the value of current flowing through the inverter PCB (or fan PCB in case of Detection Fan Motor 2).
  • Page 282 Troubleshooting by Error Code SiUS342003E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check in Monitor Mode For the models equipped with 2 fan motors, check the fan motor M1F or M2F applicable to the error code E7 while in monitor mode of the outdoor unit.
  • Page 283 SiUS342003E Troubleshooting by Error Code CHECK 16 Check for the connector (Red) (White) (Black) (power supply cable) of the fan motor. Resistance between U, V, W phases of the fan motor power supply cable has lost Replace the relevant fan motor. balance or short circuit is caused between U, V, W phases.

  • Page 284: Electronic Expansion Valve Coil Abnormality

    Troubleshooting by Error Code SiUS342003E 3.38 Electronic Expansion Valve Coil Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect 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 285 SiUS342003E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply once, and then turn it ON again. Investigate external causes other than Return to normal? failures (e.g.

  • Page 286: Discharge Pipe Temperature Abnormality

    Troubleshooting by Error Code SiUS342003E 3.39 Discharge Pipe Temperature Abnormality Error Code Applicable All outdoor unit models Models 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 When discharge pipe temperature sharply rises (remains at 120°C (248°F) or more for a period of consecutive 10 minutes)
  • Page 287 SiUS342003E Troubleshooting by Error Code 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 288: Wet Alarm

    Troubleshooting by Error Code SiUS342003E 3.40 Wet Alarm Error Code Applicable All outdoor unit models Models 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 289 SiUS342003E Troubleshooting by Error Code 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.

  • Page 290: Refrigerant Overcharged

    Troubleshooting by Error Code SiUS342003E 3.41 Refrigerant Overcharged Error Code Applicable All outdoor unit models Models 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 291: Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb)

    SiUS342003E Troubleshooting by Error Code 3.42 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB) Error Code Applicable All outdoor unit models Models Method of Error Check for the transmission conditions of the harnesses between the PCBs using microcomputer. Detection Error Decision When normal transmission between PCB is disabled during the compressor stops running.

  • Page 292: Outdoor Fan Motor Signal Abnormality

    Troubleshooting by Error Code SiUS342003E 3.43 Outdoor Fan Motor Signal Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect of abnormal signal from fan motor. Detection Error Decision An abnormal signal is detected at startup of the fan motor operation. Conditions Supposed Abnormal signal from fan motor (Circuit failure)

  • Page 293: Thermistor Abnormality

    SiUS342003E Troubleshooting by Error Code 3.44 Thermistor Abnormality H9, J3, J5, J6, J7, J8, J9 Error Code Applicable All outdoor unit models Models 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 Defective connection of thermistor...
  • Page 294 Troubleshooting by Error Code SiUS342003E ∗1. Error codes and thermistors Note: RXYQ72XA RXYQ96/120XA RXYQ144/168XA Error Applicable Electric Electric Electric Code Thermistor symbol Connector symbol Connector symbol Connector H9 Outdoor air X18A X18A X18A thermistor Discharge pipe (M1C) R21T X29A R21T R21T thermistor Discharge...

  • Page 295: High Pressure Sensor Abnormality

    SiUS342003E Troubleshooting by Error Code 3.45 High Pressure Sensor Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect 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 296 Troubleshooting by Error Code SiUS342003E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. (1)Mount a pressure gauge on the high pressure service port. (2)Connect the Service Checker for VRV systems.

  • Page 297: Low Pressure Sensor Abnormality

    SiUS342003E Troubleshooting by Error Code 3.46 Low Pressure Sensor Abnormality Error Code Applicable All outdoor unit models Models 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 298 Troubleshooting by Error Code SiUS342003E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. (1)Mount a pressure gauge on the low pressure service port. (2)Connect the Service Checker for VRV systems.

  • Page 299: Inverter Pcb Abnormality

    SiUS342003E Troubleshooting by Error Code 3.47 Inverter PCB Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to current value detected during the output of waveform before compressor Detection startup Detect according to current value detected with the current sensor during synchronous operation for startup Error Decision When overcurrent (OCP) flows during the output of waveform...
  • Page 300 Troubleshooting by Error Code SiUS342003E 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 301: Reactor Temperature Rise Abnormality

    SiUS342003E Troubleshooting by Error Code 3.48 Reactor Temperature Rise Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to the value detected with the reactor surface thermistor. Detection Error Decision When the temperature detected with the reactor surface thermistor is more than the specified Conditions temperature.

  • Page 302: Inverter Radiation Fin Temperature Rise Abnormality

    Troubleshooting by Error Code SiUS342003E 3.49 Inverter Radiation Fin Temperature Rise Abnormality Error Code Applicable All outdoor unit models Models 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. Conditions Cooling tube plate poor heat-exchange.

  • Page 303: Compressor Instantaneous Overcurrent

    SiUS342003E Troubleshooting by Error Code 3.50 Compressor Instantaneous Overcurrent Error Code Applicable All outdoor unit models Models Method of Error Detect current flowing through the power transistor. Detection Error Decision When overcurrent flows instantaneously through the power transistor (∗1) Conditions Supposed Defective compressor coil (such as wiring disconnection or insulation failure) Causes...
  • Page 304 Troubleshooting by Error Code SiUS342003E Power OFF wiring and wire connections to the relevant Rectify the wiring and compressor wire connections. normal? insulation resistance of the relevant Replace the compressor is 100 kΩ compressor. ( 1) or less. RXYQ72-120XA: M1C RXYQ144/168XA: M1C, M2C The coil of the relevant...

  • Page 305: Compressor Overcurrent

    SiUS342003E Troubleshooting by Error Code 3.51 Compressor Overcurrent Error Code Applicable All outdoor unit models Models Method of Error Detect current flowing through the power transistor. Detection When the secondary-side inverter current exceeds: ∗1 Error Decision Conditions Supposed Compressor overloaded Causes Wiring disconnection in compressor coil Disconnection of compressor wiring...
  • Page 306 Troubleshooting by Error Code SiUS342003E Power OFF wiring and wire connections to the relevant Rectify the wiring and compressor wire connections. normal? insulation resistance of the Replace the relevant compressor is 100 kΩ or less to compressor. ( 1) ground. RXYQ72-120XA: M1C RXYQ144/168XA: M1C, M2C The coil...

  • Page 307: Compressor Startup Abnormality

    SiUS342003E Troubleshooting by Error Code 3.52 Compressor Startup Abnormality Error Code Applicable All outdoor unit models Models 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 The stop valve is not opened...
  • Page 308 Troubleshooting by Error Code SiUS342003E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Startup for the first time after installation? Is a proper amount of refrigerant Charge a proper amount of charged? refrigerant.
  • Page 309 SiUS342003E Troubleshooting by Error Code 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 Replace the compressor. relevant compressor 100 kΩ...

  • Page 310: Transmission Error Between Inverter Pcb And Outdoor Unit Main Pcb

    Troubleshooting by Error Code SiUS342003E 3.53 Transmission Error between Inverter PCB and Outdoor Unit Main PCB Error Code Applicable All outdoor unit models Models Method of Error Check for the transmission conditions between the inverter PCB and the outdoor unit main PCB Detection using a microcomputer.
  • Page 311 SiUS342003E Troubleshooting by Error Code The insulation resistance of the Replace the fan motor. relevant fan motor is not more than 1 MΩ. microcomputer normal monitor indication lamp This is not the LC error. (green) on the control Recheck the error code. PCB (A1P) is blinking.

  • Page 312: Power Supply Voltage Imbalance

    Troubleshooting by Error Code SiUS342003E 3.54 Power Supply Voltage Imbalance Error Code Applicable All outdoor unit models Models Method of Error Detect voltage imbalance through PCB. Detection Error Decision When power supply voltage imbalance exceeds approximately 12 V. Conditions Error is not decided while the unit operation is continued. P1 will be displayed by pressing the inspection button.
  • Page 313 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. ∗1. Make measurement of voltage at the power supply terminal block (X1M).

  • Page 314: Reactor Temperature Abnormality

    Troubleshooting by Error Code SiUS342003E 3.55 Reactor Temperature Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to the value detected with the reactor surface thermistor. Detection Error Decision The system is in operation and the thermistor causes wiring disconnection or short circuit in it. Conditions Supposed Defective connection of thermistor...

  • Page 315: Inverter Radiation Fin Temperature Abnormality

    SiUS342003E Troubleshooting by Error Code 3.56 Inverter Radiation Fin Temperature Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect the resistance of the following thermistors during the compressor stops running: Detection (1) Radiation fin thermistor. (2) Thermistor located in PCB circuit. (3) Heat sink thermistor.
  • Page 316 Troubleshooting by Error Code SiUS342003E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check in Monitor Mode For the models equipped with 2 compressors, check the compressor M1C or M2C applicable to the error code P4 while in monitor mode of the outdoor unit.

  • Page 317: Field Setting After Replacing Outdoor Unit Main Pcb Abnormality Or Combination Of Pcb Abnormality

    SiUS342003E Troubleshooting by Error Code 3.57 Field Setting after Replacing Outdoor Unit Main PCB Abnormality or Combination of PCB Abnormality Error Code Applicable All outdoor unit models Models Method of Error This error is detected according to communications with the inverter PCB. Detection Error Decision Make judgment according to communication data on whether or not the type of the inverter PCB is...

  • Page 318: Refrigerant Shortage

    Troubleshooting by Error Code SiUS342003E 3.58 Refrigerant Shortage Error Code Applicable All outdoor unit models Models Method of Error Detect refrigerant shortage according to a low pressure level or a difference in heat exchanger Detection temperature from the suction pipe. Error Decision Low pressure becomes 0.1 MPa (14.5 psi) or less.

  • Page 319: Reverse Phase, Open Phase

    SiUS342003E Troubleshooting by Error Code 3.59 Reverse Phase, Open Phase Error Code Applicable All outdoor unit models Models Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or Detection reverse phase are judged. Error Decision When a power supply is reverse phase, or T phase is open phase.

  • Page 320: Power Supply Insufficient Or Instantaneous Abnormality

    Troubleshooting by Error Code SiUS342003E 3.60 Power Supply Insufficient or Instantaneous Abnormality Error Code Applicable All outdoor unit models Models 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 specified Conditions voltage.
  • Page 321 SiUS342003E 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 in Monitor Mode For the models equipped with 2 compressors, check the compressor M1C or M2C applicable to the error code U2 while in monitor mode of the outdoor unit.
  • Page 322 Troubleshooting by Error Code SiUS342003E Connect and disconnect the following connectors: RXYQ72-120XA: X4A (A3P)↔X20A (A1P) X6A (A3P)↔X28A (A1P) RXYQ144/168XA : X4A (A3P)↔X20A (A1P) X6A (A3P)↔X28A (A1P) X4A (A6P)↔X41A (A3P) X6A (A6P)↔X61A (A3P) inverter PCB Replace the inverter PCB has damage. ( 1).

  • Page 323: Check Operation Not Executed

    SiUS342003E Troubleshooting by Error Code 3.61 Check Operation not Executed Error Code Applicable All outdoor unit models Models 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 324: Transmission Error Between Indoor Units And Outdoor Units

    Troubleshooting by Error Code SiUS342003E 3.62 Transmission Error between Indoor Units and Outdoor Units Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error Microcomputer checks if transmission between indoor and outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
  • Page 325 SiUS342003E Troubleshooting by Error Code Correct the voltage (230 V). ∗1 :OFF :BLINK Does the Is voltage microcomputer between L1 and N SEG1 SEG2 SEG3 normal monitor indication terminals of the outdoor lamp (HAP) on the unit main PCB 380 outdoor unit main to 415 V? PCB blink?
  • Page 326 Troubleshooting by Error Code SiUS342003E U4-03 Indication after launch test Check controller indoor units : operation? (1)Some error about thermistor, or fan motor, electronic expansion valve, or defective PCB. (2) Test operation was interrupted by the MODE Operate all indoor units. (BS1) button.

  • Page 327: Transmission Error Between Remote Controller And Indoor Unit

    SiUS342003E Troubleshooting by Error Code 3.63 Transmission Error between Remote Controller and Indoor Unit Error Code Applicable All indoor unit models Models 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 328: Transmission Error Between Outdoor Units

    Troubleshooting by Error Code SiUS342003E 3.64 Transmission Error between Outdoor Units Error Code Applicable All outdoor unit models Models 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 Connection error of transmission wirings between outdoor unit and external control adaptor for...
  • Page 329 SiUS342003E Troubleshooting by Error Code 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 330 Troubleshooting by Error Code SiUS342003E Diagnosis Flow-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 331 SiUS342003E Troubleshooting by Error Code Diagnosis Flow-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 332 Troubleshooting by Error Code SiUS342003E Diagnosis Flow-3 U7-03 Error code Sub code (Transmission error between master and slave 1) multi transmission wirings to multi slave 1 have Replace the outdoor unit main caused wiring disconnection in them or are being PCB (A1P) for multi slave 1.
  • Page 333 SiUS342003E Troubleshooting by Error Code Diagnosis Flow-6 U7-06 Error code Sub code (Manual address setting error for slave 1, 2) One of outdoor unit multi transmission wirings has Replace the outdoor unit main caused wiring disconnection in it PCB (A1P). or been disconnected.

  • Page 334: Transmission Error Between Main And Sub Remote Controllers

    Troubleshooting by Error Code SiUS342003E 3.65 Transmission Error between Main and Sub Remote Controllers Error Code Applicable All indoor unit models Models Method of Error In case of controlling with 2 remote controller, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub remote controller) is normal.

  • Page 335: Transmission Error Between Indoor Unit And Outdoor Unit In The Same System

    SiUS342003E Troubleshooting by Error Code 3.66 Transmission Error between Indoor Unit and Outdoor Unit in the Same System Error Code Applicable All indoor unit models All outdoor unit models Models 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 336: Improper Combination Of Indoor Unit And Outdoor Unit, Indoor Unit And Remote Controller

    Troubleshooting by Error Code SiUS342003E 3.67 Improper Combination of Indoor Unit and Outdoor Unit, Indoor Unit and Remote Controller Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error A difference occurs in data by the type of refrigerant between indoor and outdoor units. Detection The number of indoor units connected is out of the allowable range.
  • Page 337 SiUS342003E Troubleshooting by Error Code 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 338 Troubleshooting by Error Code SiUS342003E 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 not FXTQ-TA? PCB (A1P). more than 64. Incorrect electric heater capacity setting...
  • Page 339 SiUS342003E Troubleshooting by Error Code Diagnosis Flowchart-3 UA-20 Error code Sub code Multi connection? Replace the outdoor unit main PCB (A1P). Was the different model outdoor unit Replace the outdoor unit main PCB of outdoor unit is main PCB replaced with (A1P).
  • Page 340 Troubleshooting by Error Code SiUS342003E Diagnosis Flowchart-5 UA-29 Error code Sub code Is there any branch selector Incorrect system setup. unit connected? Check if system is heat pump or heat recovery. Was the outdoor unit main Replace the outdoor unit main PCB PCB replaced with a (A1P).

  • Page 341: Incorrect Gas Furnace Connecting Number

    SiUS342003E Troubleshooting by Error Code 3.68 Incorrect Gas Furnace Connecting Number Error Code Applicable CXTQ-TA Models 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 342: Incorrect Electric Heater Capacity Setting

    Troubleshooting by Error Code SiUS342003E 3.69 Incorrect Electric Heater Capacity Setting UA-17 Error Code Applicable FXTQ-TA Models 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 343: Address Duplication Of Centralized Controller

    SiUS342003E Troubleshooting by Error Code 3.70 Address Duplication of Centralized Controller Error Code Applicable All indoor unit models Models Centralized controller 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 344: Transmission Error Between Centralized Controller And Indoor Unit

    Troubleshooting by Error Code SiUS342003E 3.71 Transmission Error between Centralized Controller and Indoor Unit Error Code Applicable All indoor unit models Central remote controller Models Schedule timer intelligent Touch Controller 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 345 SiUS342003E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the indoor unit for which UE is displayed. Is Continued to A the transmission error (on the following UE caused on all page)
  • Page 346 Troubleshooting by Error Code SiUS342003E Check the transmission wiring between centralized controller for any broken wire. For details, refer to information in the Correct the wiring. “Procedure for checking broken wires” section. CHECK 15 Check the transmission wiring between main centralized controller for any broken wire.

  • Page 347: System Not Set Yet

    SiUS342003E Troubleshooting by Error Code 3.72 System Not Set Yet Error Code Applicable All indoor unit models Models All outdoor unit models 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 348: System Abnormality, Refrigerant System Address Undefined

    Troubleshooting by Error Code SiUS342003E 3.73 System Abnormality, Refrigerant System Address Undefined Error Code Applicable All indoor unit models All outdoor unit models Models 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 349 SiUS342003E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Does an error electricity occur even after being introduced 12 minutes elapses for the first time after from the time when Normal installation or after an...

  • Page 350: Climate Talk Communication System Combination Error (Before Initial Setting For Communication Completes)

    Troubleshooting by Error Code SiUS342003E 3.74 Climate Talk Communication System Combination Error (Before Initial Setting for Communication Completes) UH-05 Error Code Applicable CXTQ-TA Models 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 minutes after the power is turned ON.

  • Page 351: (After Initial Setting For Communication Completes)

    SiUS342003E Troubleshooting by Error Code 3.75 Climate Talk Communication System Combination Error (After Initial Setting for Communication Completes) UH-06 Error Code Applicable CXTQ-TA Models 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 setting for communication with the gas furnace completes and after elapsing 4 minutes after the Conditions...

  • Page 352: Check

    Check SiUS342003E 4. Check High Pressure Check CHECK 1 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. ←Check to be sure the stop valve is open. Stop valve closed Local High pipe ←Conduct visual checks for pipe conditions. pressure Bent or crashed pipe resistance...

  • Page 353: Low Pressure Check

    SiUS342003E Check Low Pressure Check CHECK 2 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. [In cooling] Defective low pressure ←Is the pressure value checked with the Service Checker sensor Defective (∗1.) corresponding to the measurement value of the pressure sensor? compressor Defective Defective outdoor unit...
  • Page 354 Check SiUS342003E Refer to page 346. CHECK 7 Refer to page 347. CHECK 8 Service Diagnosis...

  • Page 355: Superheat Operation Check

    SiUS342003E Check Superheat Operation Check CHECK 3 Identify the defective points referring to the failure factor analysis (FTA) as follows. Hot gas circuit clogging Defective hot Defective solenoid ← Are the coil resistance and insulation normal? gas bypass valve coil control Defective solenoid valve body...
  • Page 356 Check SiUS342003E ∗1: Refer to Low pressure protection control for hot gas bypass control. Notes: ∗2: Superheating temperature control in cooling is conducted by indoor unit electronic expansion valve. ∗3: Superheating temperature control in heating is conducted by outdoor unit electronic expansion valve (main).

  • Page 357: Power Transistor Check

    SiUS342003E Check Power Transistor Check CHECK 4 Perform the following procedures prior to check. (1) Power OFF. (2) Remove all the wiring connected to the PCB where power transistors are mounted on. Preparation ∗ Prepare the analog type of multimeter. Multimeter For the digital type of multimeter, those with diode check function are available for the...

  • Page 358: Refrigerant Overcharge Check

    Check SiUS342003E 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 overcharge of refrigerant 1.

  • Page 359: Refrigerant Shortage Check

    SiUS342003E 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 judgment, refer to the information below. Diagnosis of shortage of refrigerant 1.

  • Page 360: Vacuuming And Dehydration Procedure

    Check SiUS342003E 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>...

  • Page 361: Thermistor Check

    SiUS342003E Check Thermistor Check CHECK 11 Thermistor type of indoor units Indoor heat exchanger Indoor heat exchanger Suction air thermistor Discharge air thermistor (liquid) thermistor (gas) thermistor Model FXFQ-T Type C Type J – FXZQ-TA Type B – Type A FXUQ-P Type C –...
  • Page 362 Check SiUS342003E Table 2 Thermistor temperature Resistance (kΩ) (°C) (°F) Type A Type B Type C –30 –22 363.8 361.7719 – –25 –13 266.8 265.4704 – –20 –4 197.8 196.9198 – –15 148.2 147.5687 – –10 112.0 111.6578 111.8 –5 85.52 85.2610 85.42...
  • Page 363 SiUS342003E Check Thermistor temperature Resistance (kΩ) (°C) (°F) Type E Type F Type H Type J –30 –22 362.4862 354.1 3257.371 359.8518 –25 –13 265.9943 259.7 2429.222 265.0699 –20 –4 197.3083 192.6 1827.883 197.1476 –15 147.8597 144.2 1387.099 147.7348 –10 111.8780 109.1 1061.098...

  • Page 364: Pressure Sensor Check

    Check SiUS342003E Pressure Sensor Check CHECK 12 4.15 4.15 Detected Pressure (MPa) = × V – × 0.5 (psi) (kg/cm (MPa) (MPa) = × V – × 0.5 51.0 5.0 1 MPa = 145 psi : High pressure (MPa) 45.9 : Low pressure (MPa) High Pressure (P : Output Voltage (High Side) (VDC)

  • Page 365: Broken Wire Check Of The Relay Wires

    SiUS342003E 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 366: Fan Motor Connector Check (Power Supply Cable)

    Check SiUS342003E 4.11 Fan Motor Connector Check (Power Supply Cable) CHECK 16 Indoor unit (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 367: Fan Motor Connector Check (Signal Cable)

    SiUS342003E Check 4.12 Fan Motor Connector Check (Signal Cable) CHECK 17 Resistance measuring points and judgment criteria Indoor unit FXFQ-T, FXZQ-TA, FXUQ-P, FXSQ05-48TA, FXMQ07-12PB White Orange Judgment criteria Criteria Measuring point Brown 1 Ω 1 - 4 1 Ω Blue 2 - 4 1 Ω...
  • Page 368 Check SiUS342003E Outdoor unit (1) Turn OFF the power supply. (2) Measure the resistance between Vcc and each phase of U, V, W, and GND and each phase at the motor side connectors (5-core wire) to check that the values are balanced within the range of ±...

  • Page 369: Electronic Expansion Valve Coil Check

    SiUS342003E Check 4.13 Electronic Expansion Valve Coil Check Measure the connector pin-to-pin resistance and make sure that the resistance value is within the CHECK 18 range listed in the table below. Determine the type according to the connector wire color and measure the resistance. Outdoor unit White (1) Yellow (2)
  • Page 370 Check SiUS342003E Indoor unit FXFQ-T, FXZQ-TA, FXUQ-P, FXEQ-P, FXSQ-TA, FXTQ-TA, CXTQ-TA Orange (1) Red (2) Measuring points Judgment criteria Yellow (3) 1 - 6 2 - 6 35-55 Ω Black (4) 3 - 6 4 - 6 — (5) Gray (6) FXMQ-PB, FXAQ-P White (1) Yellow (2)

  • Page 371: Fan Motor Connector Check For Fxtq-Ta

    SiUS342003E Check 4.14 Fan Motor Connector Check for FXTQ-TA CHECKING EMERSON ULTRATECH ECM MOTORS CHECK 19 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 372 Check SiUS342003E Power Green Motor Indication(s) Button Action Confirm 24VAC to UltraCheck-EZ tool. If 24VAC Rotating is confirmed, diagnostic tool is inoperable. Blinking Rotating Motor and control/end bell are functioning properly. Rotating Replace motor control/end bell. Check motor (refer to Motor Checks on page 361). Blinking Rotating Replace motor control/end bell;...
  • Page 373 SiUS342003E Check Electrical Checks - Low Voltage Control Circuits 1. Turn on power to air handler or modular. Warning Line Voltage now present. 2. Check voltage between pins on the 4-wire motor control harness between the motor and control board. 3.
  • Page 374 Check SiUS342003E 7. 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 MΩ or greater, the control/end bell is functioning properly. Replace the control/end bell if the resistance is lower than 1 MΩ. 8.
  • Page 375 SiUS342003E Part 7 Appendix 1. Wiring Diagrams..................363 1.1 Outdoor Unit ..................... 363 1.2 Indoor Unit....................369 1.3 Air Treatment Equipment ................. 383 Appendix...

  • Page 376: Wiring Diagrams

    Wiring Diagrams SiUS342003E 1. Wiring Diagrams Outdoor Unit RXYQ72XATJA 3D121952 Appendix...
  • Page 377 SiUS342003E Wiring Diagrams RXYQ96/120XATJA Appendix...
  • Page 378 Wiring Diagrams SiUS342003E RXYQ144/168XATJA Appendix...
  • Page 379 SiUS342003E Wiring Diagrams RXYQ72XAYDA 3D121955 Appendix...
  • Page 380 Wiring Diagrams SiUS342003E RXYQ96/120XAYDA Appendix...
  • Page 381 SiUS342003E Wiring Diagrams RXYQ144/168XAYDA Appendix...

  • Page 382: Indoor Unit

    Wiring Diagrams SiUS342003E Indoor Unit FXFQ07/09/12/15/18/24/30/36/48TVJU Appendix...
  • Page 383 SiUS342003E Wiring Diagrams BYCQ125BGW1 (Self-Cleaning Decoration Panel for FXFQ-TVJU) Appendix...
  • Page 384 Wiring Diagrams SiUS342003E FXZQ05/07/09/12/15/18TAVJU Appendix...
  • Page 385 SiUS342003E Wiring Diagrams FXUQ18/24/30/36PVJU Appendix...
  • Page 386 Wiring Diagrams SiUS342003E FXEQ07/09/12/15/18/24PVJU Appendix...
  • Page 387 SiUS342003E Wiring Diagrams FXDQ07/09/12/18/24MVJU Appendix...
  • Page 388 Wiring Diagrams SiUS342003E FXSQ05/07/09/12/15/18/24/30/36/48/54TAVJU Appendix...
  • Page 389 SiUS342003E Wiring Diagrams FXMQ07/09/12/15/18/24/30/36/48/54PBVJU Appendix...
  • Page 390 Wiring Diagrams SiUS342003E FXMQ72/96MVJU Appendix...
  • Page 391 SiUS342003E Wiring Diagrams FXHQ12/24/36MVJU Appendix...
  • Page 392 Wiring Diagrams SiUS342003E FXAQ07/09/12/18/24PVJU Appendix...
  • Page 393 SiUS342003E Wiring Diagrams FXLQ07/09/12/18/24MVJU, FXNQ07/09/12/18/24MVJU Appendix...
  • Page 394 Wiring Diagrams SiUS342003E FXTQ09/12/18/24/30/36/42/48/54/60TAVJUA(D) (SEE NOTE 4) 208/230 GROUND LUG HEATER KIT (SEE NOTE 5) DISCONNECT SWITCH WIRING INSTALLING AUX ALARM (ALARM) (SEE NOTE 6) (SEE NOTE 1) (SEE NOTE 1) 24VAC 24VAC RELAY IN (ACC-IN) HEATER KIT RELAY OUT (A1P) OUTPUT (ACC-OUT)
  • Page 395 SiUS342003E Wiring Diagrams CXTQ24/36/48/60TASBLU Appendix...

  • Page 396: Air Treatment Equipment

    Wiring Diagrams SiUS342003E Air Treatment Equipment 1.3.1 Outdoor-air Processing Unit FXMQ48/72/96MFVJU Appendix...
  • Page 397 SiUS342003E Wiring Diagrams 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Appendix...
  • Page 398 Wiring Diagrams SiUS342003E VAM1200GVJU Appendix...

  • Page 399: Revision History

    Revision History Month / Year Version Revised contents 12 / 2019 SiUS342003E First edition...
  • Page 400 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. 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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