Daikin REYQ-XA Service Manual
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Daikin REYQ-XA Service Manual

Daikin REYQ-XA Service Manual

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Table of Contents

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Service
Manual
REYQ72-456XATJU
REYQ72-456XAYDU
REYQ72-432XAYCU
Heat Recovery 60 Hz
SiUS371901E

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Summary of Contents for Daikin REYQ-XA

  • Page 1 SiUS371901E Service Manual REYQ72-456XATJU REYQ72-456XAYDU REYQ72-432XAYCU Heat Recovery 60 Hz...
  • Page 2 SiUS371901E REYQ-XA Heat Recovery 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. Used Icons ....................xii Part 1 General Information .............. 1 1. Model Names ....................2 1.1 Indoor Unit....................
  • Page 3 SiUS371901E 2.1 REYQ72/96/120XATJU, REYQ72/96/120XAYDU, REYQ72/96/120XAYCU................74 2.2 REYQ144/168XATJU, REYQ144/168XAYDU, REYQ144/168XAYCU................76 3. Refrigerant Flow for Each Operation Mode..........78 3.1 Cooling Operation ..................78 3.2 Heating Operation ..................79 3.3 Simultaneous Cooling and Heating Operation ........... 80 3.4 Cooling Oil Return Operation ..............81 3.5 Defrost Heating Oil Return Operation ............
  • Page 4 SiUS371901E 5.3 Compressor Step Control................. 112 5.4 Electronic Expansion Valve PI Control............. 114 5.5 Step Control of Outdoor Fans ..............115 5.6 Heat Exchanger Control ................116 6. Protection Control ................... 117 6.1 High Pressure Protection Control............. 117 6.2 Low Pressure Protection Control.............. 119 6.3 Discharge Pipe Protection Control ............
  • Page 5 SiUS371901E 2. Field Settings for Outdoor Unit..............188 2.1 DIP Switch Setting Mounting a Spare PCB..........188 2.2 Accessing the BS Buttons on the PCB............. 190 2.3 Operating the BS Buttons and DIP Switches on the PCB......191 2.4 Connecting the PC Configurator to the Outdoor Unit ....... 194 2.5 Monitoring Function and Field Settings ............
  • Page 6 SiUS371901E 3.24 Blower Motor HP Mismatch..............280 3.25 Indoor Blower Does Not Have Required Parameters to Function .... 281 3.26 Remote Sensor Abnormality ..............282 3.27 Humidity Sensor System Abnormality ............283 3.28 Infrared Presence/Floor Sensor Error ............284 3.29 Remote Controller Thermistor Abnormality ..........289 3.30 Outdoor Unit Main PCB Abnormality............
  • Page 7 SiUS371901E 3.68 Transmission Error between Main and Sub Remote Controllers ..... 355 3.69 Transmission Error between Indoor Units and Outdoor Units in the Same System ............356 3.70 Improper Combination of Indoor, Branch Selector and Outdoor Units..357 3.71 Incorrect Gas Furnace Connecting Number..........364 3.72 Incorrect Electric Heater Capacity Setting..........
  • Page 8 Safety Cautions SiUS371901E 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 SiUS371901E 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 Safety Cautions SiUS371901E 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 SiUS371901E 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 SiUS371901E 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 SiUS371901E Used Icons 2. Used Icons 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, lose data, get Caution...

  • Page 14: Table Of Contents

    SiUS371901E Part 1 General Information 1. Model Names ....................2 1.1 Indoor Unit....................2 1.2 Outdoor Unit ....................3 1.3 Air Treatment Equipment ................4 1.4 Branch Selector Unit ..................4 2. External Appearance................... 5 2.1 Indoor Unit....................5 2.2 Outdoor Unit ....................6 2.3 Air Treatment Equipment ................

  • Page 15: Model Names

    SiUS371901E 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: Outdoor Unit

    Model Names SiUS371901E Outdoor Unit REYQ-XATJU (208/230 V) Capacity range (ton) Power supply, Standard Capacity index Heat recovery REYQ 72XA 96XA 120XA 144XA 168XA 192XA Capacity range (ton) Power supply, Standard Capacity index Heat recovery REYQ 216XA 240XA 264XA 288XA 312XA 336XA Capacity range (ton)

  • Page 17: Air Treatment Equipment

    SiUS371901E Model Names Air Treatment Equipment Outdoor-Air Processing Unit Series Model name Power supply, Standard FXMQ 48MF 72MF 96MF Energy Recovery Ventilator (VAM series) Series Model name Power supply, Standard 300G 470G 600G 1200G : 1 phase, 208/230 V, 60 Hz U(VJU) : Standard symbol Branch Selector Unit Single Branch Selector Unit...

  • Page 18: External Appearance

    External Appearance SiUS371901E 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 4 way blow ceiling suspended type Wall mounted type FXUQ-P FXAQ-P...

  • Page 19: Outdoor Unit

    SiUS371901E External Appearance Outdoor Unit Single Outdoor Unit REYQ72/96/120/144/168XATJU REYQ72/96/120/144/168XAYDU REYQ72/96/120/144/168XAYCU Double Outdoor Unit REYQ192/216/240/264/288/312/336XATJU REYQ192/216/240/264/288/312/336XAYDU REYQ192/216/240/264/288/312/336XAYCU Triple Outdoor Unit REYQ360/384/408/432/456XATJU REYQ360/384/408/432/456XAYDU REYQ360/384/408/432XAYCU General Information...

  • Page 20: Air Treatment Equipment

    External Appearance SiUS371901E Air Treatment Equipment Outdoor-air processing unit Energy recovery ventilator (VAM series) FXMQ-MF VAM-G Branch Selector Unit Single branch selector unit Multi branch selector unit BS-Q54T BSQ-T General Information...

  • Page 21: Combination Of Outdoor Units

    SiUS371901E Combination of Outdoor Units 3. Combination of Outdoor Units REYQ-XATJU, REYQ-XAYDU, REYQ-XAYCU System capacity Module Number of Outdoor unit multi connection (Ton) units piping kit — BHFP26P100U BHFP26P151U Notes: 1 For multiple connection, the outdoor unit multi connection piping kit (separately sold) is required. 2 Except REYQ-XAYCU.

  • Page 22: Capacity Range

    Capacity Range SiUS371901E 4. Capacity Range Connection Ratio Total capacity index of the indoor units Connection ratio = Capacity index of the outdoor units REYQ96/120/144/168XATJU, REYQ96/120/144/168XAYDU, REYQ96/120/144/168XAYCU Max. connection ratio Type of connected air treatment Types of connected indoor units equipments Min.

  • Page 23: Limitation Of Capacity Index For Heat Recovery

    SiUS371901E Capacity Range Limitation of Capacity Index for Heat Recovery Single Branch Selector Unit Model BSQ36TVJ BSQ60TVJ BSQ96TVJ Maximum number of connectable indoor units Total capacity index of connectable indoor units 36 or less More than 36 and 60 or less More than 60 and 96 or less Multi Branch Selector Unit Model...

  • Page 24: Specifications

    Specifications SiUS371901E 5. Specifications REYQ-XATJU Model name REYQ72XATJU 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 77,000 (22.6) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 25 SiUS371901E Specifications Model name REYQ96XATJU 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 26 Specifications SiUS371901E Model name REYQ120XATJU 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 27 SiUS371901E Specifications Model name REYQ144XATJU 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 28 Specifications SiUS371901E Model name REYQ168XATJU Power supply 3 phase, 208/230 V, 60 Hz Nominal 168,000 (49.2) Btu/h 1 Cooling capacity (kW) Rated 160,000 (46.9) Nominal 188,000 (55.1) Btu/h 2 Heating capacity (kW) Rated 180,000 (52.7) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 29 SiUS371901E Specifications Model name (Combination unit) REYQ192XATJU REYQ96XATJU Model name (Independent unit) REYQ96XATJU 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 30 Specifications SiUS371901E Model name (Combination unit) REYQ216XATJU REYQ96XATJU Model name (Independent unit) REYQ120XATJU 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 232,000 (68.0) Casing color...
  • Page 31 SiUS371901E Specifications Model name (Combination unit) REYQ240XATJU REYQ120XATJU Model name (Independent unit) REYQ120XATJU 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 32 Specifications SiUS371901E Model name (Combination unit) REYQ264XATJU REYQ120XATJU Model name (Independent unit) REYQ144XATJU 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 33 SiUS371901E Specifications Model name (Combination unit) REYQ288XATJU REYQ144XATJU Model name (Independent unit) REYQ144XATJU 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 294,000 (86.1) Casing color...
  • Page 34 Specifications SiUS371901E Model name (Combination unit) REYQ312XATJU REYQ144XATJU Model name (Independent unit) REYQ168XATJU 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 320,000 (93.8) Casing color...
  • Page 35 SiUS371901E Specifications Model name (Combination unit) REYQ336XATJU REYQ168XATJU Model name (Independent unit) REYQ168XATJU Power supply 3 phase, 208/230 V, 60 Hz Nominal 336,000 (98.5) Btu/h 1 Cooling capacity (kW) Rated 320,000 (93.8) Nominal 378,000 (110.8) Btu/h 2 Heating capacity (kW) Rated 338,000 (99.1) Casing color...
  • Page 36 Specifications SiUS371901E Model name (Combination unit) REYQ360XATJU REYQ120XATJU Model name (Independent unit) REYQ120XATJU REYQ120XATJU 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 376,000 (110.2)
  • Page 37 SiUS371901E Specifications Model name (Combination unit) REYQ384XATJU REYQ120XATJU Model name (Independent unit) REYQ120XATJU REYQ144XATJU Power supply 3 phase, 208/230 V, 60 Hz Nominal 384,000 (112.5) Btu/h 1 Cooling capacity (kW) Rated 364,000 (106.7) Nominal 432,000 (126.6) Btu/h 2 Heating capacity (kW) Rated 386,000 (113.1)
  • Page 38 Specifications SiUS371901E Model name (Combination unit) REYQ408XATJU REYQ120XATJU Model name (Independent unit) REYQ144XATJU REYQ144XATJU Power supply 3 phase, 208/230 V, 60 Hz Nominal 408,000 (119.6) Btu/h 1 Cooling capacity (kW) Rated 388,000 (113.7) Nominal 459,000 (134.5) Btu/h 2 Heating capacity (kW) Rated 394,000 (115.5)
  • Page 39 SiUS371901E Specifications Model name (Combination unit) REYQ432XATJU REYQ144XATJU Model name (Independent unit) REYQ144XATJU REYQ144XATJU Power supply 3 phase, 208/230 V, 60 Hz Nominal 432,000 (126.6) Btu/h 1 Cooling capacity (kW) Rated 410,000 (120.2) Nominal 486,000 (142.4) Btu/h 2 Heating capacity (kW) Rated 405,000 (118.7)
  • Page 40 Specifications SiUS371901E Model name (Combination unit) REYQ456XATJU REYQ144XATJU Model name (Independent unit) REYQ144XATJU REYQ168XATJU Power supply 3 phase, 208/230 V, 60 Hz Nominal 450,000 (131.9) Btu/h 1 Cooling capacity (kW) Rated 430,000 (126.0) Nominal 513,000 (150.3) Btu/h 2 Heating capacity (kW) Rated 414,000 (121.3)

  • Page 41: Reyq-Xaydu

    SiUS371901E Specifications REYQ-XAYDU Model name REYQ72XAYDU 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 77,000 (22.6) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 42 Specifications SiUS371901E Model name REYQ96XAYDU 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 43 SiUS371901E Specifications Model name REYQ120XAYDU 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 44 Specifications SiUS371901E Model name REYQ144XAYDU 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 45 SiUS371901E Specifications Model name REYQ168XAYDU Power supply 3 phase, 460 V, 60 Hz Nominal 168,000 (49.2) Btu/h 1 Cooling capacity (kW) Rated 160,000 (46.9) Nominal 188,000 (55.1) Btu/h 2 Heating capacity (kW) Rated 180,000 (52.7) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 46 Specifications SiUS371901E Model name (Combination unit) REYQ192XAYDU REYQ96XAYDU Model name (Independent unit) REYQ96XAYDU 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 47 SiUS371901E Specifications Model name (Combination unit) REYQ216XAYDU REYQ96XAYDU Model name (Independent unit) REYQ120XAYDU 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 232,000 (68.0) Casing color...
  • Page 48 Specifications SiUS371901E Model name (Combination unit) REYQ240XAYDU REYQ120XAYDU Model name (Independent unit) REYQ120XAYDU 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 49 SiUS371901E Specifications Model name (Combination unit) REYQ264XAYDU REYQ120XAYDU Model name (Independent unit) REYQ144XAYDU 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 50 Specifications SiUS371901E Model name (Combination unit) REYQ288XAYDU REYQ144XAYDU Model name (Independent unit) REYQ144XAYDU 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 294,000 (86.1) Casing color...
  • Page 51 SiUS371901E Specifications Model name (Combination unit) REYQ312XAYDU REYQ144XAYDU Model name (Independent unit) REYQ168XAYDU 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 320,000 (93.8) Casing color...
  • Page 52 Specifications SiUS371901E Model name (Combination unit) REYQ336XAYDU REYQ168XAYDU Model name (Independent unit) REYQ168XAYDU Power supply 3 phase, 460 V, 60 Hz Nominal 336,000 (98.5) Btu/h 1 Cooling capacity (kW) Rated 320,000 (93.8) Nominal 378,000 (110.8) Btu/h 2 Heating capacity (kW) Rated 338,000 (99.1) Casing color...
  • Page 53 SiUS371901E Specifications Model name (Combination unit) REYQ360XAYDU REYQ120XAYDU Model name (Independent unit) REYQ120XAYDU REYQ120XAYDU 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 376,000 (110.2)
  • Page 54 Specifications SiUS371901E Model name (Combination unit) REYQ384XAYDU REYQ120XAYDU Model name (Independent unit) REYQ120XAYDU REYQ144XAYDU Power supply 3 phase, 460 V, 60 Hz Nominal 384,000 (112.5) Btu/h 1 Cooling capacity (kW) Rated 364,000 (106.7) Nominal 432,000 (126.6) Btu/h 2 Heating capacity (kW) Rated 386,000 (113.1)
  • Page 55 SiUS371901E Specifications Model name (Combination unit) REYQ408XAYDU REYQ120XAYDU Model name (Independent unit) REYQ144XAYDU REYQ144XAYDU Power supply 3 phase, 460 V, 60 Hz Nominal 408,000 (119.6) Btu/h 1 Cooling capacity (kW) Rated 388,000 (113.7) Nominal 459,000 (134.5) Btu/h 2 Heating capacity (kW) Rated 394,000 (115.5)
  • Page 56 Specifications SiUS371901E Model name (Combination unit) REYQ432XAYDU REYQ144XAYDU Model name (Independent unit) REYQ144XAYDU REYQ144XAYDU Power supply 3 phase, 460 V, 60 Hz Nominal 432,000 (126.6) Btu/h 1 Cooling capacity (kW) Rated 410,000 (120.2) Nominal 486,000 (142.4) Btu/h 2 Heating capacity (kW) Rated 405,000 (118.7)
  • Page 57 SiUS371901E Specifications Model name (Combination unit) REYQ456XAYDU REYQ144XAYDU Model name (Independent unit) REYQ144XAYDU REYQ168XAYDU Power supply 3 phase, 460 V, 60 Hz Nominal 450,000 (131.9) Btu/h 1 Cooling capacity (kW) Rated 430,000 (126.0) Nominal 513,000 (150.3) Btu/h 2 Heating capacity (kW) Rated 414,000 (121.3)

  • Page 58: Reyq-Xaycu

    Specifications SiUS371901E REYQ-XAYCU Model name REYQ72XAYCU Power supply 3 phase, 575 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 77,000 (22.6) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 59 SiUS371901E Specifications Model name REYQ96XAYCU Power supply 3 phase, 575 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 60 Specifications SiUS371901E Model name REYQ120XAYCU Power supply 3 phase, 575 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 61 SiUS371901E Specifications Model name REYQ144XAYCU Power supply 3 phase, 575 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 62 Specifications SiUS371901E Model name REYQ168XAYCU Power supply 3 phase, 575 V, 60 Hz Nominal 168,000 (49.2) Btu/h 1 Cooling capacity (kW) Rated 160,000 (46.9) Nominal 188,000 (55.1) Btu/h 2 Heating capacity (kW) Rated 180,000 (52.7) Casing color Ivory white (5Y7.5/1) Dimensions: (H ×...
  • Page 63 SiUS371901E Specifications Model name (Combination unit) REYQ192XAYCU REYQ96XAYCU Model name (Independent unit) REYQ96XAYCU Power supply 3 phase, 575 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 64 Specifications SiUS371901E Model name (Combination unit) REYQ216XAYCU REYQ96XAYCU Model name (Independent unit) REYQ120XAYCU Power supply 3 phase, 575 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 232,000 (68.0) Casing color...
  • Page 65 SiUS371901E Specifications Model name (Combination unit) REYQ240XAYCU REYQ120XAYCU Model name (Independent unit) REYQ120XAYCU Power supply 3 phase, 575 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 66 Specifications SiUS371901E Model name (Combination unit) REYQ264XAYCU REYQ120XAYCU Model name (Independent unit) REYQ144XAYCU Power supply 3 phase, 575 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 67 SiUS371901E Specifications Model name (Combination unit) REYQ288XAYCU REYQ144XAYCU Model name (Independent unit) REYQ144XAYCU Power supply 3 phase, 575 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 294,000 (86.1) Casing color...
  • Page 68 Specifications SiUS371901E Model name (Combination unit) REYQ312XAYCU REYQ144XAYCU Model name (Independent unit) REYQ168XAYCU Power supply 3 phase, 575 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 320,000 (93.8) Casing color...
  • Page 69 SiUS371901E Specifications Model name (Combination unit) REYQ336XAYCU REYQ168XAYCU Model name (Independent unit) REYQ168XAYCU Power supply 3 phase, 575 V, 60 Hz Nominal 336,000 (98.5) Btu/h 1 Cooling capacity (kW) Rated 320,000 (93.8) Nominal 378,000 (110.8) Btu/h 2 Heating capacity (kW) Rated 338,000 (99.1) Casing color...
  • Page 70 Specifications SiUS371901E Model name (Combination unit) REYQ360XAYCU REYQ120XAYCU Model name (Independent unit) REYQ120XAYCU REYQ120XAYCU Power supply 3 phase, 575 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 376,000 (110.2)
  • Page 71 SiUS371901E Specifications Model name (Combination unit) REYQ384XAYCU REYQ120XAYCU Model name (Independent unit) REYQ120XAYCU REYQ144XAYCU Power supply 3 phase, 575 V, 60 Hz Nominal 384,000 (112.5) Btu/h 1 Cooling capacity (kW) Rated 364,000 (106.7) Nominal 432,000 (126.6) Btu/h 2 Heating capacity (kW) Rated 386,000 (113.1)
  • Page 72 Specifications SiUS371901E Model name (Combination unit) REYQ408XAYCU REYQ120XAYCU Model name (Independent unit) REYQ144XAYCU REYQ144XAYCU Power supply 3 phase, 575 V, 60 Hz Nominal 408,000 (119.6) Btu/h 1 Cooling capacity (kW) Rated 388,000 (113.7) Nominal 459,000 (134.5) Btu/h 2 Heating capacity (kW) Rated 394,000 (115.5)
  • Page 73 SiUS371901E Specifications Model name (Combination unit) REYQ432XAYCU REYQ144XAYCU Model name (Independent unit) REYQ144XAYCU REYQ144XAYCU Power supply 3 phase, 575 V, 60 Hz Nominal 426,000 (124.8) Btu/h 1 Cooling capacity (kW) Rated 410,000 (120.2) Nominal 486,000 (142.4) Btu/h 2 Heating capacity (kW) Rated 405,000 (118.7)
  • Page 74 SiUS371901E Part 2 Refrigerant Circuit 1. Refrigerant Circuit ..................62 1.1 Outdoor Unit ....................62 1.2 Indoor Unit....................65 1.3 Outdoor-Air Processing Unit............... 67 1.4 Branch Selector Unit .................. 68 2. Functional Parts Layout ................74 2.1 REYQ72/96/120XATJU, REYQ72/96/120XAYDU, REYQ72/96/120XAYCU................74 2.2 REYQ144/168XATJU, REYQ144/168XAYDU, REYQ144/168XAYCU................

  • Page 75: Refrigerant Circuit Part

    SiUS371901E Refrigerant Circuit 1. Refrigerant Circuit Outdoor Unit No. in Electric piping Name Function symbol diagram Compressor is operated on frequencies between 15 rps to 140 rps by using the inverter. Compressor Refer to page 112, 113. Inverter fan The fan rotation speed is varied in 53 steps by using inverter. Refer to page 115. Electronic expansion valve While in heating, PI control is applied to keep the outlet superheating degree of air heat (Heat exchanger upper)
  • Page 76 Refrigerant Circuit SiUS371901E REYQ72/96/120XATJU, REYQ72/96/120XAYDU, REYQ72/96/120XAYCU Refrigerant Circuit...
  • Page 77 SiUS371901E Refrigerant Circuit REYQ144/168XATJU, REYQ144/168XAYDU, REYQ144/168XAYCU Refrigerant Circuit...

  • Page 78: Indoor Unit

    Refrigerant Circuit SiUS371901E 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 79 SiUS371901E 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 80: Outdoor-Air Processing Unit

    Refrigerant Circuit SiUS371901E 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 81: Branch Selector Unit

    SiUS371901E Refrigerant Circuit Branch Selector Unit Electric Name Function Symbol In simultaneous cooling and heating, it is used to subcooling liquid Electronic expansion valve (EVSC) refrigerants when an indoor unit downstream of this Branch Selector unit is in heating. (Max : 480 pulse) Opens while in heating or all indoor units are in cooling.
  • Page 82 Refrigerant Circuit SiUS371901E 1.4.2 Multi Branch Selector Unit BS4Q54TVJ Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Gas pipe Double pipe heat (Subcooling) Electronic Expansion Valve (Suction) Filter connection port exchanger Liquid pipe connection port Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter...
  • Page 83 SiUS371901E Refrigerant Circuit BS6Q54TVJ Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Gas pipe Double pipe heat (Subcooling) Electronic Expansion Valve (Suction) Filter exchanger connection port Liquid pipe connection port Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Gas pipe Double pipe heat (Subcooling)
  • Page 84 Refrigerant Circuit SiUS371901E BS8Q54TVJ Electronic Expansion Valve ( HP/LP gas ) Electronic Expansion Valve Filter Double pipe heat Gas pipe ( Subcooling ) Electronic Expansion Valve ( Suction ) Filter exchanger connection port Liquid pipe connection port Electronic Expansion Valve ( HP/LP gas ) Electronic Expansion Valve Filter...
  • Page 85 SiUS371901E Refrigerant Circuit BS10Q54TVJ Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Double pipe heat Gas pipe (Subcooling) Electronic Expansion Valve (Suction) Filter exchanger connection port Liquid pipe connection port Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Double pipe heat Gas pipe (Subcooling)
  • Page 86 Refrigerant Circuit SiUS371901E BS12Q54TVJ Electronic Expansion Valve (HP/LP gas) Electronic Expansion Valve Filter Double pipe heat (Subcooling) Gas pipe Electronic Expansion Valve (Suction) exchanger Filter connection port Liquid pipe connection port Electronic Electronic Expansion Valve (HP/LP gas) Expansion Valve Filter Double pipe heat Gas pipe (Subcooling)

  • Page 87: Functional Parts Layout

    SiUS371901E Functional Parts Layout 2. Functional Parts Layout REYQ72/96/120XATJU, REYQ72/96/120XAYDU, REYQ72/96/120XAYCU Plane View Electronic expansion valve High pressure sensor (Refrigerant cooling) (S1NPH) (Y5E) Solenoid valve (Liquid shutoff) Electronic expansion valve (Y3S) (Subcooling heat exchanger) Solenoid valve (Y2E) (Hot gas bypass) Four way valve (Y2S) (Heat exchanger upper)
  • Page 88 Functional Parts Layout SiUS371901E Part B Thermistor (Receiver gas purge) (R13T) Electronic expansion valve (Receiver gas purge) (Y7E) Part A detail Thermistor (Subcooling injection) (R16T) Thermistor (Receiver inlet) (R3T) Thermistor (Heat exchanger liquid upper) (R4T) Thermistor (Heat exchanger liquid lower) (R5T) Thermistor (Subcooling liquid) (R7T)

  • Page 89: Reyq144/168Xatju, Reyq144/168Xaydu, Reyq144/168Xaycu

    SiUS371901E Functional Parts Layout REYQ144/168XATJU, REYQ144/168XAYDU, REYQ144/168XAYCU Plane View High pressure sensor Electronic expansion valve (S1NPH) (Refrigerant cooling) Solenoid valve (Liquid shutoff) (Y5E) (Y3S) Electronic expansion valve (Subcooling heat exchanger) Solenoid valve (Y2E) (Hot gas bypass) Four way valve (Y2S) (Heat exchanger upper) Solenoid valve (Oil separator oil return) (Y6S)
  • Page 90 Functional Parts Layout SiUS371901E Electronic expansion valve (Receiver gas purge) (Y7E) Part B Thermistor (Receiver gas purge) (R13T) Part A detail Thermistor (Subcooling injection) (R16T) Thermistor (Receiver inlet) (R3T) Thermistor (Heat exchanger liquid upper) (R4T) Thermistor (Heat exchanger liquid lower) (R5T) Thermistor (Subcooling liquid) (R7T)

  • Page 91: Refrigerant Flow For Each Operation Mode

    SiUS371901E Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode Cooling Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid S1NPH S1NPL S1PH C: 3D119212 C: 3D119213 Refrigerant Circuit...

  • Page 92: Heating Operation

    Refrigerant Flow for Each Operation Mode SiUS371901E Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid S1NPH S1NPL S1PH C: 3D119212 C: 3D119213 Refrigerant Circuit...

  • Page 93: Simultaneous Cooling And Heating Operation

    SiUS371901E Refrigerant Flow for Each Operation Mode Simultaneous Cooling and Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid S1NPH S1NPL S1PH C: 3D119212 C: 3D119213 Refrigerant Circuit...

  • Page 94: Cooling Oil Return Operation

    Refrigerant Flow for Each Operation Mode SiUS371901E Cooling Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid S1NPH S1NPL S1PH C: 3D119212 C: 3D119213 Refrigerant Circuit...

  • Page 95: Defrost Heating Oil Return Operation

    SiUS371901E Refrigerant Flow for Each Operation Mode Defrost Heating Oil Return Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid S1NPH S1NPL S1PH C: 3D119212 C: 3D119213 Refrigerant Circuit...

  • Page 96: Oil Return Operation At Simultaneous Cooling And Heating Operation

    Refrigerant Flow for Each Operation Mode SiUS371901E Oil Return Operation at Simultaneous Cooling and Heating Operation High temperature, high pressure gas High temperature, high pressure liquid Low temperature, low pressure gas Low temperature, low pressure liquid S1NPH S1NPL S1PH C: 3D119212 C: 3D119213 Refrigerant Circuit...
  • Page 97 SiUS371901E Part 3 Remote Controller 1. Applicable Models ..................85 2. Names and Functions ................86 2.1 BRC1E73 ....................86 2.2 Wireless Remote Controller ............... 89 3. Main/Sub Setting..................90 3.1 BRC1E73 ....................90 3.2 When Wireless Remote Controller is Used Together......... 91 4.

  • Page 98: Applicable Models

    Applicable Models SiUS371901E 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 99: Names And Functions

    SiUS371901E 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 100 Names and Functions SiUS371901E 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 101 SiUS371901E 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 102: Wireless Remote Controller

    Names and Functions SiUS371901E 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 103: Main/Sub Setting

    SiUS371901E 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 104: When Wireless Remote Controller Is Used Together

    Main/Sub Setting SiUS371901E 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 105: Address Setting For Wireless Remote Controller

    SiUS371901E 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 106 Address Setting for Wireless Remote Controller SiUS371901E 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 107: Centralized Control Group No. Setting

    SiUS371901E 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 108 Centralized Control Group No. Setting SiUS371901E 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 109: Wireless Remote Controller

    SiUS371901E 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 110: Group No. Setting Example

    Centralized Control Group No. Setting SiUS371901E 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 111: Service Settings Menu, Maintenance Menu

    SiUS371901E 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 112 Service Settings Menu, Maintenance Menu SiUS371901E 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 113 SiUS371901E 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 114 Service Settings Menu, Maintenance Menu SiUS371901E 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 115 SiUS371901E Part 4 Functions and Control 1. Function General..................104 1.1 Outdoor Unit ..................... 104 1.2 Branch Selector Unit & Indoor Unit Operation Mode Detail ..... 105 2. Stop Control .................... 106 2.1 Stop due to Error ..................106 2.2 When System is in Stop Control............... 106 2.3 Slave Unit Stops during Master Unit Control..........
  • Page 116 SiUS371901E 9.4 Thermostat Control................... 142 9.5 Drain Pump Control.................. 145 9.6 Control of Electronic Expansion Valve ............. 147 9.7 Freeze-Up Prevention ................148 9.8 List of Swing Flap Operations ..............150 9.9 Hot Start Control (In Heating Only) ............151 9.10 Louver Control for Preventing Ceiling Dirt..........

  • Page 117: Function General

    SiUS371901E Function General 1. Function General Outdoor Unit For detailed description of each function in the flow below, refer to the details on related function on the following pages. Stop control (1) Stop due to error (2) When system is in stop control (3) Slave unit stops during master unit control Special control Standby control...

  • Page 118: Branch Selector Unit & Indoor Unit Operation Mode Detail

    Function General SiUS371901E Branch Selector Unit & Indoor Unit Operation Mode Detail ∗ 1. The switch for the Branch Selector unit is operated when pressure equalization control turns ON after cooling/heating mode of other indoor unit is changed or on the timing of oil returns. ∗...

  • Page 119: Stop Control

    SiUS371901E Stop Control 2. Stop Control Stop due to Error In order to protect compressors, if any of the abnormal state occurs, the system will stop with thermostat OFF and the error will be determined when the retry times reaches certain number. (Refer to Error Codes and Descriptions on page 236 of the troubleshooting for the items to determine the error.) When System is in Stop Control...

  • Page 120: Standby Control

    Standby Control SiUS371901E 3. Standby Control Restart Standby Used to forcedly stop the compressor for a period of 2 minutes, in order to prevent the frequent ON/OFF of the compressor and equalize the pressure within the refrigerant system. In addition, the outdoor fan carry out the residual control for a while to accelerate pressure equalizing and to suppress melting of the refrigerant to the evaporator.

  • Page 121: Startup Control

    SiUS371901E Startup Control 4. Startup Control This control is used to equalize the pressure in the suction and discharge sides of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.

  • Page 122: Startup Control In Heating

    Startup Control SiUS371901E Startup Control in Heating Frequency step up 5 sec. interval +10 rps/10 sec. Frequency REYQ72-120XA REYQ144/168XA (rps) 16.4 16.4 0 Hz Compressor (M1C) PI control Initial opening Electronic expansion 0 pulse valve (main) (Y1E) Step 8 Inverter fan Step 4 (M1F + M2F) Pc –...

  • Page 123: Basic Control

    SiUS371901E Basic Control 5. Basic Control Normal Control Function Part name Electric symbol Normal simultaneous Normal cooling Normal heating cooling/heating PI control, High PI control, High PI control, High pressure protection, pressure protection, pressure protection, Low pressure Low pressure Low pressure Compressor protection, protection,...

  • Page 124: Compressor Pi Control

    Basic Control SiUS371901E Compressor PI Control Carries out the compressor capacity PI control to maintain Te at constant during cooling operation and Tc at constant during heating operation to ensure stable unit performance. On multi-outdoor-unit systems, this control is made according to values of the first-priority unit, which is detected with the pressure sensor.

  • Page 125: Compressor Step Control

    SiUS371901E Basic Control Compressor Step Control The compressor operation varies in the following steps according to information in Compressor PI Control on page 111. Single unit installation REYQ72-120XA Step No. Step No. Step No. 15.0 36.7 84.5 15.2 37.2 85.7 15.4 37.7 86.9...
  • Page 126 Basic Control SiUS371901E REYQ144/168XA Step No. Step No. Step No. Step No. 16.4 24.2 55.7 128.2 16.5 24.5 56.4 130.0 16.6 24.9 57.2 131.8 16.7 25.2 58.0 133.7 16.8 25.6 58.9 135.6 REYQ168XA upper limit 16.9 25.9 59.7 17.0 26.3 60.5 17.1 26.6...

  • Page 127: Electronic Expansion Valve Pi Control

    SiUS371901E Basic Control Electronic Expansion Valve PI Control Main electronic expansion valve EVM control When the outdoor unit heat exchanging is performed via the condenser (Y5S or Y6S is set to OFF), this function is used to exert PI control on the electronic expansion valve (Y1E or Y3E) so that the condenser outlet subcooling degree (SC) will become constant.

  • Page 128: Step Control Of Outdoor Fans

    Basic Control SiUS371901E Step Control of Outdoor Fans Used to control the revolutions of outdoor fans in the steps listed in table below, according to condition changes. Standard (default) Heating/ Step X Cooling Simultaneous Step No. Cooling Heating REYQ72XA REYQ96XA REYQ120XA REYQ144/168XA 1040...

  • Page 129: Heat Exchanger Control

    SiUS371901E Basic Control Heat Exchanger Control While in heating or cool/heat simultaneous operation, ensure target condensing and evaporating temperature by changing over the air heat exchange of outdoor unit to the evaporator or the condenser in response to loads. Single system Outdoor unit Outdoor unit Lower side...

  • Page 130: Protection Control

    Protection Control SiUS371901E 6. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure.
  • Page 131 SiUS371901E Protection Control Heating Normal control < 3.17 MPa > 3.31 MPa (460 psi) (480 psi) Pc: High pressure sensor detection value for master > 3.39 MPa unit (492 psi) All units Compressor step: 1 9-step down After 10 After 10 seconds >...

  • Page 132: Low Pressure Protection Control

    Protection Control SiUS371901E Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. Cooling Normal control < 0.25 MPa > 0.39 MPa (36.3 psi) (56.6 psi) Pe: Low pressure sensor detection value for master unit All compressors step: 1...

  • Page 133: Discharge Pipe Protection Control

    SiUS371901E Protection Control Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against an error or transient increase of discharge pipe temperature. HTdi : Value of compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature : Compressor body temperature : Maximum of HTdi and Ti X (˚C)(Y (˚F)) : REYQ72-120XA...

  • Page 134: Compressor Body Protection Control

    Protection Control SiUS371901E Compressor Body Protection Control This compressor body protection control is used to protect the compressor internal temperature against an error or transient increase of compressor body temperature. Contents The following control is performed for each compressor. Normal control Compressor body temperature >...
  • Page 135 SiUS371901E Protection Control Radiation fin temperature control This control is performed for each compressor. Normal control Reduce compressor capacity When occurring 4 times within 60 Fin temperature standby minutes, the error code L4 is output. Condition REYQ72-120XATJU REYQ72-120XAYDU REYQ72-120XAYCU more than 95°C (203°F) more than 96°C (204.8°F) more than 90°C (194°F) less than 92°C (197.6°F)

  • Page 136: Special Control

    Special Control SiUS371901E 7. Special Control Pump Down Residual Control Pc : High pressure sensor detection value Pe : Low pressure sensor detection value Ta : Outdoor air temperature Te : Low pressure equivalent saturation temperature DSH : Discharge pipe superheating degree If the liquid refrigerant stays in the evaporator at the startup of a compressor, this liquid refrigerant enters the compressor, thus resulting in diluted oil in the compressor and then degraded lubrication performance.

  • Page 137: Oil Return Control

    SiUS371901E Special Control Oil Return Control In order to prevent the compressor from running out of oil, the oil return control is conducted to recover oil that has flowed out from the compressor to the system side. Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature TsA: Suction pipe temperature detected by thermistor R3T 7.2.1 Oil Return Control in Cooling Operation...
  • Page 138 Special Control SiUS371901E Indoor unit actuator Oil return control Thermostat ON unit Remote controller setting Non-operating unit Thermostat OFF unit Remote controller setting Thermostat ON unit Normal control Electronic expansion valve Non-operating unit 224 pulse Thermostat OFF unit Forced thermostat ON (PI control) Branch Selector unit actuator Normal cooling Thermostat ON...
  • Page 139 SiUS371901E Special Control 7.2.2 Oil Return Control in Heating Operation Starting conditions Part name Electric symbol Oil return control +1 to +6 steps from frequency to frequency when oil return is IN Compressor at a constant level Inverter fan M1F, M2F Same as normal control Electronic expansion valve (Heat exchanger upper)

  • Page 140: Defrost Control

    Special Control SiUS371901E Defrost Control To defrost the outdoor heat exchanger while in Evaporator, the defrost control is conducted to recover the heating capacity. Tb: Heat exchanger deicer temperature Part name Electric symbol Defrost control REYQ72-120XA: 134 rps Compressor REYQ144/168XA: 119 rps With high pressure Inverter fan M1F, M2F...

  • Page 141: Outdoor Unit Rotation

    SiUS371901E Special Control Outdoor Unit Rotation In the case of multi outdoor unit system, this outdoor unit rotation prevents the compressor from breaking down due to unbalanced oil level between outdoor units. Details of outdoor unit rotation In the case of multi outdoor unit system, each outdoor unit is given an operating priority for the control.

  • Page 142: Cooling/Heating Mode Switching

    Special Control SiUS371901E Cooling/Heating Mode Switching [While in cooling/heating mixed mode, single-room cooling → heating] First, the electronic expansion valve of the indoor unit in cooling operation will close, and the Y2E and Y3E electronic expansion valves of the branch selector unit will all close once. Next, the Y2E electronic expansion valve will open little by little to perform pressure equalization.
  • Page 143 SiUS371901E Special Control [While in cooling/heating mixed mode, single-room heating → cooling] First, the electronic expansion valve of the indoor unit in heating operation will close, and the Y2E and Y3E electronic expansion valves of the branch selector unit will all close once. Next, the Y3E electronic expansion valve will open little by little to perform pressure equalization.
  • Page 144 Special Control SiUS371901E [While in all-room cooling operation → All-room cooling/heating simultaneous operation] Dual pressure gas pipe (1) All the indoor units in cooling operation · Using the dual pressure gas pipe as a suction Suction gas pipe gas pipe. Liquid pipe (2) Pump down residual operation...
  • Page 145 SiUS371901E Special Control [While in all-room heating operation or cooling/heating simultaneous operation → All-room cooling] Dual pressure gas pipe (1) In heating operation or cooling and heating simultaneous operation Suction gas pipe · Using the dual pressure gas pipe as a suction gas pipe.

  • Page 146: Other Control

    Other Control SiUS371901E 8. Other Control Backup Operation If any of the compressors goes wrong, disable the relevant compressor or the relevant outdoor unit from operating, and then conduct emergency operation only with operational compressors or outdoor units. "Emergency operation with remote controller reset" and "Emergency operation with outdoor unit PCB setting"...

  • Page 147: Outline Of Control (Indoor Unit)

    SiUS371901E Outline of Control (Indoor Unit) 9. 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 148 Outline of Control (Indoor Unit) SiUS371901E ∗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 149 SiUS371901E Outline of Control (Indoor Unit) 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 150 Outline of Control (Indoor Unit) SiUS371901E ∗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 154. ∗5. If the evaporator inlet temperature is kept at not more than –5°C (23°F) for a period of cumulative 10 min.

  • Page 151: Set Temperature And Control Temperature

    SiUS371901E Outline of Control (Indoor Unit) Set Temperature and Control Temperature 9.2.1 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 152 Outline of Control (Indoor Unit) SiUS371901E 9.2.2 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 153: Remote Controller Thermistor

    SiUS371901E Outline of Control (Indoor Unit) Remote Controller Thermistor Temperature is controlled by both the remote controller thermistor and suction air thermistor for the indoor unit. (This is however limited to when the field setting for the remote controller thermistor is set to Use.) Note: When fresh air intake kit is used, outdoor air is mixed with indoor air, and the room temperature...
  • Page 154 Outline of Control (Indoor Unit) SiUS371901E 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 155: Thermostat Control

    SiUS371901E Outline of Control (Indoor Unit) Thermostat Control 9.4.1 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 156 Outline of Control (Indoor Unit) SiUS371901E 9.4.2 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 157 SiUS371901E Outline of Control (Indoor Unit) 9.4.3 Thermostat Control with Operation Mode Set to AUTO The system will conduct this temperature control shown below, only when the wireless remote controller or any central remote controller is connected. Furthermore, setting changes of the differential value (D) can be made. Second code No.

  • Page 158: Drain Pump Control

    Outline of Control (Indoor Unit) SiUS371901E Drain Pump Control 9.5.1 Normal Operation Float switch Thermostat (running) Error display Drain pump 5 min. • The float switch is ON in normal operation. • When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. •...
  • Page 159 SiUS371901E Outline of Control (Indoor Unit) 9.5.3 If the Float Switch is OFF with the Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec. • When the float switch turns OFF, the drain pump turns ON simultaneously. •...

  • Page 160: Control Of Electronic Expansion Valve

    Outline of Control (Indoor Unit) SiUS371901E 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 161: Freeze-Up Prevention

    SiUS371901E Outline of Control (Indoor Unit) Freeze-Up Prevention Freeze-Up Prevention by Off Cycle (Indoor Unit) When the temperature detected by the liquid pipe temperature thermistor of the indoor heat exchanger drops too low, the unit enters freeze-up prevention control in accordance with the following conditions, and is also set in accordance with the conditions given below.
  • Page 162 Outline of Control (Indoor Unit) SiUS371901E 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 163: List Of Swing Flap Operations

    SiUS371901E Outline of Control (Indoor Unit) 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 164: Hot Start Control (In Heating Only)

    Outline of Control (Indoor Unit) SiUS371901E 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 165: Louver Control For Preventing Ceiling Dirt

    SiUS371901E Outline of Control (Indoor Unit) 9.10 Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of in which air direction can be adjusted in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.

  • Page 166: Heater Control (Except Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS371901E 9.11 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 167: Heater Control (Fxtq-Ta Models)

    SiUS371901E Outline of Control (Indoor Unit) 9.12 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 168 Outline of Control (Indoor Unit) SiUS371901E 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 169 SiUS371901E Outline of Control (Indoor Unit) 9.12.2 Heat Pump Lockout Control For heating operation, users can select to use electric heater. For this, signals are sent using ABC terminal of outdoor unit PCB. When the hot-water heating signal is received from the outdoor unit PCB, heating operation is performed only with the electric heater as manual backup operation.

  • Page 170: Gas Furnace Control (Cxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS371901E 9.13 Gas Furnace Control (CXTQ-TA Models) Outline When conditions for gas furnace operation are established, the system transits into gas furnace operation, CXTQ requires the gas furnace combustion heating. Detail • Thermostat: ON • Thermostat: OFF Thermostat OFF Thermostat ON •...

  • Page 171: 3-Step Thermostat Processing (Fxtq-Ta Models)

    SiUS371901E Outline of Control (Indoor Unit) 9.14 3-Step Thermostat Processing (FXTQ-TA Models) Outline The thermostat ON/OFF for the indoor unit is controlled in accordance with [Thermostat step 1]. The heater ON/OFF operation during heating is controlled as follows. Thermostat step 2, 3: Auxiliary electric heater control Thermostat step 1, 2: Heat pump lockout control For more details of the heater, refer to Heater Control (FXTQ-TA Models) on page 154.

  • Page 172: Fan Control (Heater Residual) (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS371901E 9.15 Fan Control (Heater Residual) (FXTQ-TA Models) Outline If the indoor heater turned OFF from ON during heating operation, the fan will keep operating for further period of time in order to cool the heater. Detail Residual ON •...
  • Page 173 SiUS371901E Outline of Control (Indoor Unit) 9.16.3 Economizer When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the outdoor air to save energy. This operation is called economizer operation, and the equipment to detect indoor and outdoor air temperatures and open and close the damper to perform this operation is called an economizer.
  • Page 174 SiUS371901E Part 5 Field Settings and Test Operation 1. Field Settings for Indoor Unit..............162 1.1 Field Settings with Remote Controller ............162 1.2 List of Field Settings for Indoor Unit ............166 1.3 Details of Field Settings for Indoor Unit............ 170 1.4 Gas Furnace Set Up.................

  • Page 175: Field Settings For Indoor Unit

    SiUS371901E Field Settings for Indoor Unit 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 176 Field Settings for Indoor Unit SiUS371901E 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 177 SiUS371901E Field Settings for Indoor Unit 1.1.2 Wireless Remote Controller UP button Mode No. Field setting mode DOWN button RESERVE button First code No. MODE button Second code No. INSPECTION/TEST button To set the field settings, you have to change: Mode No.
  • Page 178 Field Settings for Indoor Unit SiUS371901E 1.1.3 Simplified Remote Controller Mode No. First code Unit No. Second code No. (2)(8) (7) 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 179: List Of Field Settings For Indoor Unit

    SiUS371901E Field Settings for Indoor Unit 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 180 Field Settings for Indoor Unit SiUS371901E Mode First Second Code No. Code Setting Contents (∗2) 4 (*11) Optional kit setting (UV lamp + humidifier + Refer to page 181 for details. economizer) Set temperature: Set temperature: 5 (*11) Residential dry same as cooling set —...
  • Page 181 SiUS371901E Field Settings for Indoor Unit 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 182 Field Settings for Indoor Unit SiUS371901E 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 183: Details Of Field Settings For Indoor Unit

    SiUS371901E Field Settings for Indoor Unit Details of Field Settings for Indoor Unit 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...
  • Page 184 Field Settings for Indoor Unit SiUS371901E 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 185 SiUS371901E Field Settings for Indoor Unit 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 186 Field Settings for Indoor Unit SiUS371901E 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.
  • Page 187 SiUS371901E Field Settings for Indoor Unit 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 188 Field Settings for Indoor Unit SiUS371901E Electric Heater Capacity Setting (for FXTQ-TA models) Second Code No. First Mode Model Code Heater (kW) heater kit FXTQ09TAVJUA — — — — — — — FXTQ09TAVJUD — — — — — — — FXTQ12TAVJUA —...
  • Page 189 SiUS371901E Field Settings for Indoor Unit 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 190 Field Settings for Indoor Unit SiUS371901E Compensating the Floor Temperature (For units with the infrared presence/floor sensor only) Offset the detected value of the infrared presence/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 191 SiUS371901E Field Settings for Indoor Unit 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 192 Field Settings for Indoor Unit SiUS371901E Airflow Setting when Cooling Thermostat is OFF This is used to set airflow to "LL airflow" when cooling thermostat is OFF. Mode No. First Code No. Second Code No. Contents LL tap 12 (22) Set fan speed Setting of Airflow Rate Make the following setting according to the ceiling height.
  • Page 193 SiUS371901E Field Settings for Indoor Unit Swing Pattern Settings (For units with the infrared presence/floor sensor only) Set the flap operation in swing mode. With the factory swing, flaps facing each other are synchronized to operate, and flaps placed side by side are set to swing in an opposite direction to agitate airflow to reduce temperature irregularity.
  • Page 194 Field Settings for Indoor Unit SiUS371901E FXSQ-TA models Mode No. First Code No. Second Code No. Contents 30 Pa (0.12 inWG) (∗1) (∗2) 40 Pa (0.16 inWG) (∗1) (∗2) 50 Pa (0.20 inWG) 60 Pa (0.24 inWG) 70 Pa (0.28 inWG) 80 Pa (0.32 inWG) 13 (23) 90 Pa (0.36 inWG)
  • Page 195 SiUS371901E Field Settings for Indoor Unit Gas Furnace Test Mode (for CXTQ-TA models) This setting is used for gas furnace test run. For details, refer to Gas Furnace Test Operation on page 224. Mode No. First Code No. Second Code No. Contents 14 (24) Low heat...
  • Page 196 Field Settings for Indoor Unit SiUS371901E Display of Error Codes on the Remote Controller (For BRC1E73 only) Error code (four digits) is displayed for limited products. Select two-digit display if four-digit display is not preferred. Mode No. First Code No. Second Code No.
  • Page 197 SiUS371901E Field Settings for Indoor Unit Access Permission Level Setting (For BRC1E73 only) There are 2 levels as follows: Level 2: The following buttons are selectable to be disable or enable. Level 3: No buttons are selectable and only On/Off button is available. Button Level 2 Level 3...

  • Page 198: Gas Furnace Set Up

    Field Settings for Indoor Unit SiUS371901E 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 199: List Of Field Settings For Outdoor-Air Processing Unit

    SiUS371901E Field Settings for Indoor Unit List of Field Settings for Outdoor-Air Processing Unit : Factory setting First Second Code No. Mode Setting Contents Code Filter contamination 2500 hr 1250 hr — — — — — — — — — —...
  • Page 200 Field Settings for Indoor Unit SiUS371901E 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. Example ON by remote OFF by remote...

  • Page 201: Field Settings For Outdoor Unit

    SiUS371901E Field Settings for Outdoor Unit 2. Field Settings for Outdoor Unit To continue the configuration of the VRV heat recovery system, it is required to give some input to the PCB of the unit. This chapter will describe how manual input is possible by operating the BS buttons/DIP switches on the PCB and reading the feedback from the 7 segment displays.
  • Page 202 Field Settings for Outdoor Unit SiUS371901E The figure below shows the required position of the DIP switches on spare PCB for REYQ-XA. Change DIP switches at time of power disconnected. Application model The setting method ( represents the position of switches) REYQ72XA Set DS2-2 to ON.

  • Page 203: Accessing The Bs Buttons On The Pcb

    SiUS371901E 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 204: Operating The Bs Buttons And Dip Switches On The Pcb

    Field Settings for Outdoor Unit SiUS371901E Operating the BS Buttons and DIP Switches on the PCB Operating the BS buttons By operating the BS buttons it is possible to: • Perform special actions (automatic refrigerant charging, test operation, etc). • Perform field settings (demand operation, low noise, etc).
  • Page 205 SiUS371901E Field Settings for Outdoor Unit Accessing modes The MODE (BS1) button is used to change the mode you want to access. • Access mode 1 Press the MODE (BS1) button once. Segment indication changes to: • Access mode 2 Press the MODE (BS1) button for at least 5 seconds.
  • Page 206 Field Settings for Outdoor Unit SiUS371901E Mode 2 Mode 2 is used to set field settings of the outdoor unit and system. • Changing and access the setting in mode 2: Once mode 2 is selected (press the MODE (BS1) button for more than 5 seconds), you can select the wanted setting.

  • Page 207: Connecting The Pc Configurator To The Outdoor Unit

    SiUS371901E Field Settings for Outdoor Unit Connecting the PC Configurator to the Outdoor Unit Connection of the optional PC configurator cable to the outdoor unit has to be done on A1P. Connect the 999482P3 cable to the 5-pin blue connector X27A. Caution Works executed on the outdoor unit are best done under dry weather conditions to avoid water ingress.

  • Page 208: Monitoring Function And Field Settings

    Field Settings for Outdoor Unit SiUS371901E Monitoring Function and Field Settings The operation of the outdoor unit can further be defined by changing some field settings. Next to making field settings it is also possible to confirm the current operation parameters of the unit. The setting can also be performed via the PC configuration software.
  • Page 209 SiUS371901E Field Settings for Outdoor Unit [1-5]: shows the current Te target parameter position. [1-6]: shows the current Tc target parameter position. [1-10]: shows the total number of connected indoor units. It can be convenient to check if the total number of indoor units which are installed match the total number of indoor units which are recognized by the system.
  • Page 210 Field Settings for Outdoor Unit SiUS371901E 2.5.2 Overview of Setting Mode (Mode 2) This overview shows the available settings by using the press buttons on the outdoor unit PCB. 7 segment 7 segment display display Range Item Description Description ∗1 COOL/HEAT Several systems as 1 zone change over selection...
  • Page 211 SiUS371901E Field Settings for Outdoor Unit 7 segment 7 segment display display Item Description Description Range ∗1 27 Automatic night- Time to stop automatic “night-time low About 6:00 AM time low noise noise” operation. (“Night-time low noise” About 7:00 AM operation stop level setting should also be made.) About 8:00 AM...
  • Page 212 Field Settings for Outdoor Unit SiUS371901E 7 segment 7 segment display display Item Description Description Range ∗1 35 Outdoor > 40 m To increase Tc target heating. Level > 40 m (130 ft) (130 ft) below Level max. 40 m (130 ft) indoor Do not use 37 Heat pump...
  • Page 213 SiUS371901E Field Settings for Outdoor Unit 7 segment 7 segment display display Item Description Description Range ∗1 78 Heat pump Heat pump is locked out when the outdoor –26.1°C (–15°F) lockout ambient temperature is smaller than the –23.3°C (–10°F) temperature heat pump lockout temperature.
  • Page 214 Field Settings for Outdoor Unit SiUS371901E ∗1: Numbers in the "No." column represent the number of times to press the BS button. ∗ : Setting does not return to factory setting when exit mode 2. To cancel the function, change setting manually to factory setting.
  • Page 215 SiUS371901E Field Settings for Outdoor Unit 2.5.3 Details of Setting Mode 2 (m2) 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 216 Field Settings for Outdoor Unit SiUS371901E [2-8]: Te target temperature during cooling operation Default value: 0 Value Te target [2-8] 0 (default) Auto (6-17°C) (42.8-62.6°F) 6°C (42.8°F) 7°C (44.6°F) 8°C (46.4°F) 9°C (48.2°F) 10°C (50.0°F) 11°C (51.8°F) Change [2-8] to 0, 2-7 in function of required operation method during cooling. [2-9]: Tc target temperature during heating operation Default value: 0...
  • Page 217 SiUS371901E Field Settings for Outdoor Unit [2-20]: Additional refrigerant charge In order to add the additional refrigerant charge amount following setting should be applied. Default value: 0 To activate this function, change [2-20] to 1. To stop the additional refrigerant charge operation (when the required additional refrigerant amount is charged), press the RETURN (BS3) button.
  • Page 218 Field Settings for Outdoor Unit SiUS371901E [2-27]: Night-time low noise operation stop time Default value: 3. Value Stop time automatic night-time low noise [2-27] operation (approximately) About 6:00 AM About 7:00 AM 3 (default) About 8:00 AM This setting is used in conjunction with setting [2-22]. [2-28]: Power transistor check mode To evaluate the output of the power transistors.
  • Page 219 SiUS371901E 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 REYQ-XA disconnect fasten U/V/W from compressor! Voltage Check 4 Step 1:...
  • Page 220 Field Settings for Outdoor Unit SiUS371901E 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 221 SiUS371901E 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 run under power consumption limitation conditions, this setting activates and defines the level power consumption limitation that will be applied continuously.
  • Page 222 Field Settings for Outdoor Unit SiUS371901E [2-38]: Emergency operation “Master” To disable permanent compressor operation: in case of single module or “Master” unit of a multi outdoor system, this setting allows: Default value: 0. Compressor operation enabled. Field setting: Set 3: master module is disabled permanently. [2-39]: Emergency operation “Slave 1”...
  • Page 223 SiUS371901E Field Settings for Outdoor Unit [2-49]: Height difference setting Default value: 0. In case the outdoor unit is installed in the highest position (indoor units are installed on a lower position than outdoor units) and the height difference between the lowest indoor unit and the outdoor unit exceeds 50 m (164 ft), the setting [2-49] has to be changed to 1.
  • Page 224 Field Settings for Outdoor Unit SiUS371901E [2-82]: Heating comfort setting Default value: 1. Value Heating comfort setting [2-82] 1 (default) Mild Quick Powerful Change [2-82] to 0, 1, 2 or 3 in function of required limitation. This setting is used in conjunction with setting [2-9]. [2-89]: Intermittent fan operation Default value: 0.
  • Page 225 SiUS371901E Field Settings for Outdoor Unit [2-92]: Te target temperature upper limit Default value: 1. Value Te target temperature upper limit [2-92] 1 (default) If Auto Te, then use this setting to address different load profiles. If the frequent operation is at lower system load, then use a higher setting under [2-92].
  • Page 226 Field Settings for Outdoor Unit SiUS371901E 2.5.4 Auxiliary Heat Control To improve efficiency the auxiliary heat can be lockout based on outdoor temperature. Item Description Increments Below this temperature, Auxiliary heater auxiliary heater can be 65°F allowable energized based on the 0°F (35°F 5°F...
  • Page 227 SiUS371901E Field Settings for Outdoor Unit 2.5.5 Heat Pump Lockout New control logic to provide more application options for cold climates. Outside temperature can now be measured directly from the outdoor unit coil sensor. This field setting can switch automatically to emergency heat if there is a system fault. Item Description Increments...
  • Page 228 Field Settings for Outdoor Unit SiUS371901E [2-78]: Heat pump lockout temperature Heat pump would be locked out when the outdoor air temperature is smaller than the Heat Pump Lockout Temperature below – this setting is only affective when heat pump lockout mode has been set. Unit will switch to heat pump lockout.
  • Page 229 SiUS371901E Field Settings for Outdoor Unit Error code Error contents (Auto backup possible) Branch Selector abnormality Activation of high pressure switch Activation of low pressure sensor Compressor motor lock Compressor damage alarm Outdoor unit fan motor abnormality Electronic expansion valve coil abnormality Position signal abnormality of outdoor unit fan motor Outdoor air thermistor (R1T) abnormality Discharge pipe temperature abnormality...

  • Page 230: Cool/Heat Mode Changeover

    Field Settings for Outdoor Unit SiUS371901E Cool/Heat Mode Changeover Set Cool/Heat Separately for Each Branch Selector Unit by Cool/Heat Selector. Set remote controller changeover switch DS1-1 as following: • Set the DIP switch (DS1-1) on printed circuit board (A1P) as shown below before turning on the power to the Branch Selector unit.

  • Page 231: Night-Time Low Noise Operation And Demand Operation

    SiUS371901E Field Settings for Outdoor Unit Night-Time Low Noise Operation and Demand Operation 2.7.1 Night-Time Low Noise Operation By connecting the external contact input to the low noise input of the outdoor unit external control adaptor (optional), you can lower operating noise. Setting Content Level 1...
  • Page 232 Field Settings for Outdoor Unit SiUS371901E Image of operation in the case of A Operation If capacity priority is set in sound Capacity priority setting, the fan speed will be increased according to the load of air conditioning when load is heavier. Operation sound Rated during low noise...
  • Page 233 SiUS371901E Field Settings for Outdoor Unit 2.7.2 Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition.
  • Page 234 Field Settings for Outdoor Unit SiUS371901E B.When the Normal demand operation is carried out. (Use of the external control adaptor for outdoor unit is not required.) 1.While in setting mode 2, set the item 2-32 (Setting of alternate demand) to ON. 2.While in setting mode 2, select a demand 1 level for the item 2-30.
  • Page 235 SiUS371901E Field Settings for Outdoor Unit Image of operation in the case of A and B The power Power consumption consumption can be set with the Demand 1 level setting. (70% of rated power Rated consumption has been set at factory.) The power consumption set with Demand level...

  • Page 236: Test Operation

    Test Operation SiUS371901E 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: 187 - 253 V (-XATJU) 416 - 508 V (-XAYDU) 518 - 632 V (-XAYCU) Fully open the liquid and the gas stop valve.

  • Page 237: Gas Furnace Test Operation

    SiUS371901E Test Operation Gas Furnace Test Operation Caution: Always use the remote controller to stop the test operation. The test should be performed with the following procedure. 1. All install process, including heat pump system, has been done. 2. Test operation of heat pump system has been successfully completed. 3.
  • Page 238 SiUS371901E Part 6 Service Diagnosis 1. Symptom-based Troubleshooting ............228 1.1 Indoor Unit Overall ................... 228 1.2 With Gas Furnace ..................231 1.3 Gas Furnace Lockout Reset..............231 1.4 With Optional Infrared Presence/Floor Sensor......... 232 2. Troubleshooting with Remote Controller..........233 2.1 Wired Remote Controller................
  • Page 239 SiUS371901E 3.32 Missing of Ground Leakage Detection Core ..........292 3.33 Activation of High Pressure Switch ............293 3.34 Activation of Low Pressure Sensor ............295 3.35 Compressor Motor Lock ................296 3.36 Compressor Damage Alarm ..............298 3.37 Outdoor Fan Motor Abnormality ............... 300 3.38 Electronic Expansion Valve Coil Abnormality...........
  • Page 240 SiUS371901E 3.75 System Not Set Yet .................. 369 3.76 System Abnormality, Refrigerant System Address Undefined ....370 3.77 Climate Talk Communication System Combination Error (Before Initial Setting for Communication Completes) ......372 3.78 Climate Talk Communication System Combination Error (After Initial Setting for Communication Completes) ........ 373 4.

  • Page 241: Symptom-Based Troubleshooting

    SiUS371901E Symptom-based Troubleshooting 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) •...
  • Page 242 Symptom-based Troubleshooting SiUS371901E 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 UNDER CENTRALIZED disabled. CONTROL. The remote controller displays COOL/HEAT selection is made Use the COOL/HEAT selection using the COOL/HEAT selection...
  • Page 243 SiUS371901E Symptom-based Troubleshooting 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 244: With Gas Furnace

    Symptom-based Troubleshooting SiUS371901E 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 245: With Optional Infrared Presence/Floor Sensor

    SiUS371901E Symptom-based Troubleshooting 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 246: Troubleshooting With Remote Controller

    Troubleshooting with Remote Controller SiUS371901E 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 247: Wireless Remote Controller

    SiUS371901E Troubleshooting with Remote Controller 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 248 Troubleshooting with Remote Controller SiUS371901E 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 249: Troubleshooting By Error Code

    SiUS371901E Troubleshooting by Error Code 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 control PCB abnormality Drain level control system abnormality Indoor fan motor lock, overload Indoor fan motor abnormality Overload/overcurrent/lock of indoor fan motor...
  • Page 250 Troubleshooting by Error Code SiUS371901E k: ON h: OFF l: Blink Error code Operation Descriptions Reference lamp page Outdoor Unit Harness abnormality (between outdoor unit main PCB and inverter PCB) Outdoor fan motor signal abnormality Outdoor fan PCB abnormality Outdoor air thermistor (R1T) abnormality Discharge pipe thermistor (R21T) abnormality Compressor body thermistor (R14T) abnormality Compressor suction thermistor (R12T) abnormality...

  • Page 251: Error Codes (Sub Codes)

    SiUS371901E Troubleshooting by Error Code 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 252 Troubleshooting by Error Code SiUS371901E Troubleshooting Error code Error description Diagnosis UH - 05 Climate Talk Communication system combination error (before initial setting for Refer to page 372. communication completes) UH - 06 Climate Talk Communication system combination error (after initial setting for Refer to page 373.
  • Page 253 SiUS371901E Troubleshooting by Error Code Troubleshooting Error code Error description Diagnosis E7 - 01 Fan motor M1F lock (Master) E7 - 02 Fan motor M2F lock (Master) Fan motor M1F momentary overcurrent E7 - 05 (Master) Fan motor M2F momentary overcurrent E7 - 06 (Master) E7 - 09...
  • Page 254 Troubleshooting by Error Code SiUS371901E Troubleshooting Error code Error description Diagnosis E9 - 01 Electronic expansion valve coil (Y1E) error (Master) E9 - 03 Electronic expansion valve coil (Y2E) error (Master) E9 - 04 Electronic expansion valve coil (Y3E) error (Master) Electronic expansion valve coil (Y1E) error E9 - 05 (Slave 1)
  • Page 255 SiUS371901E Troubleshooting by Error Code Troubleshooting Error code Error description Diagnosis F3 - 01 Discharge pipe high temperature error (Master) F3 - 03 Discharge pipe high temperature error (Slave 1) F3 - 05 Discharge pipe high temperature error (Slave 2) Refer to the F3 flowchart of each manual and make a diagnosis of the relevant unit based on the Error code shown to the left.
  • Page 256 Troubleshooting by Error Code SiUS371901E Troubleshooting Error code Error description Diagnosis Defective discharge pipe thermistor (R21T): J3 - 16 Open (Master) Defective discharge pipe thermistor (R21T): J3 - 17 Short (Master) Defective discharge pipe thermistor (R21T): J3 - 22 Open (Slave 1) Defective discharge pipe thermistor (R21T): J3 - 23 Short (Slave 1)
  • Page 257 SiUS371901E Troubleshooting by Error Code Troubleshooting Error code Error description Diagnosis Defective heat exchanger deicer thermistor J6 - 01 (R11T) (Master) Defective heat exchanger deicer thermistor J6 - 02 (R11T) (Slave 1) Defective heat exchanger deicer thermistor J6 - 03 (R11T) (Slave 2) Defective heat exchanger gas upper thermistor J6 - 08...
  • Page 258 Troubleshooting by Error Code SiUS371901E Troubleshooting Error code Error description Diagnosis Defective heat exchanger liquid upper J8 - 01 thermistor (R4T) (Master) Defective heat exchanger liquid upper J8 - 02 thermistor (R4T) (Slave 1) Defective heat exchanger liquid upper J8 - 03 Refer to the J8 flowchart of each manual and make a diagnosis thermistor (R4T) (Slave 2) of the relevant thermistor of the relevant unit based on the Error...
  • Page 259 SiUS371901E Troubleshooting by Error Code Troubleshooting Error code Error description Diagnosis L1 - 01 IPM error: Compressor M1C (Master) Defective current sensor 1: Compressor M1C L1 - 02 (Master) Defective current sensor 2: Compressor M1C L1 - 03 (Master) L1 - 04 IGBT error: Compressor M1C (Master) L1 - 05 Jumper settings error (Master)
  • Page 260 Troubleshooting by Error Code SiUS371901E Troubleshooting Error code Error description Diagnosis Momentary power failure during test operation L2 - 01 (Master) Momentary power failure during test operation L2 - 02 (Slave 1) Refer to the L2 flowchart of each manual and make a diagnosis Momentary power failure during test operation L2 - 03 of the relevant unit based on the Error code shown to the left.
  • Page 261 SiUS371901E Troubleshooting by Error Code Troubleshooting Error code Error description Diagnosis Transmission error (Between outdoor units, LC - 14 inverter PCB) (Master) Transmission error (Between outdoor units, LC - 15 inverter PCB) (Slave 1) Transmission error (Between outdoor units, LC - 16 inverter PCB) (Slave 2) Transmission error (Between outdoor units, fan LC - 19...
  • Page 262 Troubleshooting by Error Code SiUS371901E Troubleshooting Error code Error description Diagnosis PJ - 04 Incorrect type of inverter PCB (Master) PJ - 05 Incorrect type of inverter PCB (Slave 1) PJ - 06 Incorrect type of inverter PCB (Slave 2) PJ - 09 Incorrect type of fan PCB (Master): M1F Refer to the PJ flowchart of each manual and make a diagnosis...
  • Page 263 SiUS371901E Troubleshooting by Error Code Troubleshooting Error code Error description Diagnosis Transmission error between indoor units and U4 - 01 outdoor units Refer to the U4 flowchart of each manual and make a diagnosis of the relevant unit based on the Error code shown to the left. Transmission error between indoor unit and U4 - 03 system...

  • Page 264: External Protection Device Abnormality

    Troubleshooting by Error Code SiUS371901E External Protection Device Abnormality 3.3.1 External Protection Device Abnormality 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 "external ON/OFF terminal".
  • Page 265 SiUS371901E 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 Actuation of external protection device...

  • Page 266: Indoor Unit Control Pcb Abnormality

    Troubleshooting by Error Code SiUS371901E Indoor Unit Control 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 267: Drain Level Control System Abnormality

    SiUS371901E 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 268 Troubleshooting by Error Code SiUS371901E 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 in accordance to the Replace the indoor unit control criteria (∗3) (within 5 PCB (A1P).

  • Page 269: Indoor Fan Motor Lock, Overload

    SiUS371901E Troubleshooting by Error Code Indoor 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...
  • Page 270 Troubleshooting by Error Code SiUS371901E 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 271: Indoor Fan Motor Abnormality

    SiUS371901E Troubleshooting by Error Code Indoor Fan Motor Abnormality 3.7.1 Indoor Fan Motor Abnormality (FXDQ-M, FXHQ-M) 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 272 Troubleshooting by Error Code SiUS371901E 3.7.2 Indoor Fan Motor Abnormality (FXSQ54TA, FXMQ15-54PB) 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 273 SiUS371901E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power and wait for 10 minutes. There is a foreign matter around Remove the foreign matter.
  • Page 274 Troubleshooting by Error Code SiUS371901E 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 275: Overload/Overcurrent/Lock Of Indoor Fan Motor

    SiUS371901E 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 276: Blower Motor Not Running

    Troubleshooting by Error Code SiUS371901E 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 277: Indoor Fan Motor Status Abnormality

    SiUS371901E 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 278: Low Indoor Airflow

    Troubleshooting by Error Code SiUS371901E 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 279: Swing Flap Motor Abnormality

    SiUS371901E 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 280 Troubleshooting by Error Code SiUS371901E 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 281: Power Supply Voltage Abnormality

    SiUS371901E 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 282: Blower Motor Stops For Over/Under Voltage

    Troubleshooting by Error Code SiUS371901E 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 283: Electronic Expansion Valve Coil Abnormality, Dust Clogging

    SiUS371901E 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 284: Gas Furnace Abnormality

    Troubleshooting by Error Code SiUS371901E 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 285: Drain Level Above Limit

    SiUS371901E 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 286: Capacity Determination Device Abnormality

    Troubleshooting by Error Code SiUS371901E 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 control PCB, and whether the value is normal or abnormal is determined.

  • Page 287: Transmission Abnormality Between Indoor Unit Control Pcb And Fan Pcb

    SiUS371901E Troubleshooting by Error Code 3.19 Transmission Abnormality between Indoor Unit Control 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 288 Troubleshooting by Error Code SiUS371901E ∗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 control PCB (A1P). (2) Short circuit X70A.

  • Page 289: Blower Motor Communication Error

    SiUS371901E 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 290: Climate Talk Communication Error

    Troubleshooting by Error Code SiUS371901E 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 291: Thermistor Abnormality

    SiUS371901E 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 292: Combination Error Between Indoor Unit Control Pcb And Fan Pcb

    Troubleshooting by Error Code SiUS371901E 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 293: Blower Motor Hp Mismatch

    SiUS371901E 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 294: Indoor Blower Does Not Have Required Parameters To Function

    Troubleshooting by Error Code SiUS371901E 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 295: Remote Sensor Abnormality

    SiUS371901E 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 296: Humidity Sensor System Abnormality

    Troubleshooting by Error Code SiUS371901E 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 297: Infrared Presence/Floor Sensor Error

    SiUS371901E 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 298 Troubleshooting by Error Code SiUS371901E 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 299 SiUS371901E Troubleshooting by Error Code 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 300 Troubleshooting by Error Code SiUS371901E 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 301 SiUS371901E Troubleshooting by Error Code 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 302: Remote Controller Thermistor Abnormality

    Troubleshooting by Error Code SiUS371901E 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 303: Outdoor Unit Main Pcb Abnormality

    SiUS371901E 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 304: Detection Of Ground Leakage By Leak Detection Circuit

    Troubleshooting by Error Code SiUS371901E 3.31 Detection of Ground Leakage by Leak Detection Circuit Error Code Sub code: 01-03 Applicable All outdoor unit models Models Method of Error Detect leakage current in the ground leakage detection circuit and detect error on the outdoor unit Detection main PCB.

  • Page 305: Missing Of Ground Leakage Detection Core

    SiUS371901E Troubleshooting by Error Code 3.32 Missing of Ground Leakage Detection Core Error Code Sub code: 06-08 Applicable All outdoor unit models Models Method of Error Error is detected according to whether or not there is continuity across the connector X101A Detection for leakage detection circuit (Q1LD).

  • Page 306: Activation Of High Pressure Switch

    Troubleshooting by Error Code SiUS371901E 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 307 SiUS371901E Troubleshooting by Error Code Service Checker CHECK 12 Compare the high pressure value checked with the Service Checker and the actual value measured by pressure sensor (∗1). Check if the high pressure value and the actual value Replace the outdoor unit measured by main PCB (A1P).

  • Page 308: Activation Of Low Pressure Sensor

    Troubleshooting by Error Code SiUS371901E 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: Operating pressure: 0.07 MPa (10.2 psi) Conditions...

  • Page 309: Compressor Motor Lock

    SiUS371901E 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 compressor, and the error is detected when any abnormality is observed in the phase-current Detection waveform.
  • Page 310 Troubleshooting by Error Code SiUS371901E The insulation resistance of the relevant Replace the compressor. compressor is low (< 100 kΩ) Power OFF The relevant compressor has a wiring disconnection in it. Restart the compressor, and then check for the Quit work. operation.

  • Page 311: Compressor Damage Alarm

    SiUS371901E 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 312 Troubleshooting by Error Code SiUS371901E 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 normal? REYQ-XATJU: A3P...

  • Page 313: Outdoor Fan Motor Abnormality

    SiUS371901E Troubleshooting by Error Code 3.37 Outdoor Fan Motor Abnormality 3.37.1 Outdoor Fan Motor Abnormality (REYQ-XATJU, REYQ-XAYDU) Error Code Applicable REYQ-XATJU, REYQ-XAYDU Models Method of Error Detects according to the value of current flowing through the inverter PCB (or fan PCB in case Detection of M2F).
  • Page 314 Troubleshooting by Error Code SiUS371901E There is no continuity across the fuse Replace the fan PCB (A4P, A5P). (F101U) on the fan PCB. fan cannot be rotated by hand Replace the relevant fan motor when disconnecting the connector from the (M1F, M2F).
  • Page 315 SiUS371901E Troubleshooting by Error Code 3.37.2 Outdoor Fan Motor Abnormality (REYQ-XAYCU) Error Code Applicable REYQ-XAYCU Models Method of Error Detects according to the value of current flowing through the fan PCB. Detection Error Decision Overcurrent is detected from the fan PCB (Detecting overcurrent 4 times will shut down the Conditions system).
  • Page 316 Troubleshooting by Error Code SiUS371901E fan cannot be rotated by hand Replace the relevant fan motor when disconnecting the connector from the (M1F, M2F). fan motor. Resistance between the fan motor power supply cable Replace the relevant fan motor terminal and the motor frame (metallic part) (M1F, M2F).

  • Page 317: Electronic Expansion Valve Coil Abnormality

    SiUS371901E Troubleshooting by Error Code 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 318: Discharge Pipe Temperature Abnormality

    Troubleshooting by Error Code SiUS371901E 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 319 SiUS371901E 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 320: Wet Alarm

    Troubleshooting by Error Code SiUS371901E 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 321 SiUS371901E 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. Are the characteristics of the suction pipe...

  • Page 322: Refrigerant Overcharged

    Troubleshooting by Error Code SiUS371901E 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 323: Branch Selector Unit Electronic Expansion Valve Abnormality

    SiUS371901E Troubleshooting by Error Code 3.42 Branch Selector Unit Electronic Expansion Valve Abnormality Error Code Applicable Branch Selector unit Models Method of Error The error is detected by whether or not all coils of the electronic expansion valve have continuity. Detection Error Decision The power supply turns ON, but there is no currents pass through the common (COM[+]).

  • Page 324: Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb)

    Troubleshooting by Error Code SiUS371901E 3.43 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 Normal transmission between the PCBs is disabled while the compressor is not running.

  • Page 325: Outdoor Fan Motor Signal Abnormality

    SiUS371901E Troubleshooting by Error Code 3.44 Outdoor Fan Motor Signal Abnormality Error Code Applicable REYQ-XATJU, REYQ-XAYDU 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 326: Outdoor Fan Pcb Abnormality

    Troubleshooting by Error Code SiUS371901E 3.45 Outdoor Fan PCB Abnormality Error Code Applicable REYQ-XAYCU Models Method of Error Detect with current sensor value. Detection Error Decision When the current sensor shows abnormality. Conditions Supposed Defective fan PCB (A5P, A6P) Causes Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution...

  • Page 327: Thermistor Abnormality

    SiUS371901E Troubleshooting by Error Code 3.46 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 328 Troubleshooting by Error Code SiUS371901E ∗1. Error codes and thermistors Note: Error Applicable Thermistor Electric symbol Connector Code Outdoor air thermistor X18A Discharge pipe (M1C) thermistor R21T X19A (Group connector) Compressor body thermistor R14T X15A Compressor suction thermistor R12T (Group connector) X29A Suction pipe thermistor R10T...

  • Page 329: High Pressure Sensor Abnormality

    SiUS371901E Troubleshooting by Error Code 3.47 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 330: Low Pressure Sensor Abnormality

    Troubleshooting by Error Code SiUS371901E 3.48 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 331: Inverter Pcb Abnormality

    SiUS371901E Troubleshooting by Error Code 3.49 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 flows during the output of waveform...
  • Page 332 Troubleshooting by Error Code SiUS371901E 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. Return to normal? The error could have resulted from external factors other than failures (e.g.

  • Page 333: Momentary Power Failure During Test Operation

    SiUS371901E Troubleshooting by Error Code 3.50 Momentary Power Failure during Test Operation Error Code Applicable All outdoor unit models Models Method of Error Momentary power failure is detected by the PCB. Detection Error Decision Judgment is made by AC power frequency detection circuit on the outdoor unit main PCB Conditions Supposed Defective wiring...

  • Page 334: Reactor Temperature Rise Abnormality

    Troubleshooting by Error Code SiUS371901E 3.51 Reactor Temperature Rise Abnormality Error Code Applicable REYQ72-120XATJU 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 335: Inverter Radiation Fin Temperature Rise Abnormality

    SiUS371901E Troubleshooting by Error Code 3.52 Inverter Radiation Fin Temperature Rise Abnormality 3.52.1 Inverter Radiation Fin Temperature Rise Abnormality (Inverter PCB) Error Code Sub code: 01-03 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.
  • Page 336 Troubleshooting by Error Code SiUS371901E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for the cooling conditions of cooling tube used to cool the inverter. (1) Is the cooling tube plate fixed with screws? (2) Error code U0 is displayed on the Error History...
  • Page 337 SiUS371901E Troubleshooting by Error Code 3.52.2 Inverter Radiation Fin Temperature Rise Abnormality (Fan PCB) Error Code Sub code: 06, 07, 18-21 Applicable REYQ-XAYCU Models Method of Error Fan PCB radiation fin temperature is detected by the thermistor located inside the fan PCB circuit. Detection Error Decision Detected temperature exceeds a certain level.

  • Page 338: Compressor Instantaneous Overcurrent

    Troubleshooting by Error Code SiUS371901E 3.53 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. Conditions Supposed Defective compressor coil (such as wiring disconnection or insulation failure) Causes Compressor startup failure (mechanical lock)
  • Page 339 SiUS371901E Troubleshooting by Error Code Power OFF CHECK 4 Is the power Replace the inverter transistor normal? PCB. REYQ-XATJU: A3P REYQ-XAYDU: A3P REYQ-XAYCU: A4P Restarting the system results in the Continue operation. recurrence of the The error could have error. resulted from causes such as instantaneous power failure.

  • Page 340: Compressor Overcurrent

    Troubleshooting by Error Code SiUS371901E 3.54 Compressor Overcurrent Error Code Applicable All outdoor unit models Models Method of Error Detect current flowing through the power transistor. Detection Error Decision When the secondary-side inverter current exceeds a certain value. Conditions Supposed Compressor overloaded Causes Wiring disconnection in compressor coil...
  • Page 341 SiUS371901E Troubleshooting by Error Code Power OFF CHECK 4 Is the power Replace the inverter transistor normal? PCB. REYQ-XATJU: A3P REYQ-XAYDU: A3P REYQ-XAYCU: A4P Restarting the system results in the Continue operation. recurrence of the The error could have error. resulted from causes such as instantaneous power failure.

  • Page 342: Compressor Startup Abnormality

    Troubleshooting by Error Code SiUS371901E 3.55 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 343 SiUS371901E 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 344: Transmission Error Between Inverter Pcb And Outdoor Unit Main Pcb

    Troubleshooting by Error Code SiUS371901E 3.56 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 345 SiUS371901E Troubleshooting by Error Code microcomputer normal monitor indication This is not the LC error. lamp (green) on the outdoor unit main PCB (A1P) Recheck the error code. is blinking. microcomputer The fuse of normal monitor indication Replace the inverter PCB (∗2). the noise filter PCB has lamp (green) on the outdoor blown out.

  • Page 346: Power Supply Voltage Imbalance

    Troubleshooting by Error Code SiUS371901E 3.57 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 347 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 348: Reactor Surface Thermistor Abnormality

    Troubleshooting by Error Code SiUS371901E 3.58 Reactor Surface Thermistor Abnormality Error Code Applicable REYQ72-120XATJU Models Method of Error Detect according to the value detected with the reactor surface thermistor. Detection Error Decision When the system is in operation and the thermistor causes wiring disconnection or short circuit in it. Conditions Supposed Defective connection of thermistor...

  • Page 349: Inverter Radiation Fin Temperature Abnormality

    SiUS371901E Troubleshooting by Error Code 3.59 Inverter Radiation Fin Temperature Abnormality 3.59.1 Inverter Radiation Fin Temperature Abnormality (Inverter PCB) Error Code Sub code: 09-11 Applicable All outdoor unit models Models Method of Error Detect the resistance of the following thermistors while the compressor is not running: Radiation fin thermistor Detection Thermistor located in PCB circuit...
  • Page 350 Troubleshooting by Error Code SiUS371901E 3.59.2 Inverter Radiation Fin Temperature Abnormality (Fan PCB) Error Code Sub code: 02, 03, 15-18 Applicable All outdoor unit models Models Method of Error Detects the resistance of the thermistor located inside the fan PCB circuit while the fan motor is not Detection in operation.

  • Page 351: Field Setting After Replacing Outdoor Unit Main Pcb Abnormality Or Combination Of Pcb Abnormality

    SiUS371901E Troubleshooting by Error Code 3.60 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 352: Refrigerant Shortage

    Troubleshooting by Error Code SiUS371901E 3.61 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 exchanging Detection temperature from the suction pipe. Error Decision Low pressure becomes 0.1 MPa (14.5 psi) or less.

  • Page 353: Reverse Phase, Open Phase

    SiUS371901E Troubleshooting by Error Code 3.62 Reverse Phase, Open Phase 3.62.1 Reverse Phase, Open Phase (Except REYQ72-120XAYDU) Error Code Applicable REYQ72-168XATJU, REYQ144/168XAYDU, REYQ72-168XAYCU 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.
  • Page 354 Troubleshooting by Error Code SiUS371901E 3.62.2 Reverse Phase, Open Phase (REYQ72-120XAYDU) Error Code Applicable REYQ72-120XAYDU 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 355: Power Supply Insufficient Or Instantaneous Abnormality

    SiUS371901E Troubleshooting by Error Code 3.63 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 190 VDC Conditions (for 208/230 V models), 380 VDC (for 460 V models) or 560 VDC (for 575 V models).
  • Page 356 Troubleshooting by Error Code SiUS371901E The insulation resistance of the fan Replace the fan motor motor is not more than (M1F, M2F). 1 MΩ. If the motor gets severely damaged, the inverter PCB should also be replaced. CHECK 4 Is the power Replace the inverter PCB.

  • Page 357: Check Operation Not Executed

    SiUS371901E Troubleshooting by Error Code 3.64 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 358: Transmission Error Between Indoor Units And Outdoor Units, Open Phase In Power Supply Wiring

    Troubleshooting by Error Code SiUS371901E 3.65 Transmission Error between Indoor Units and Outdoor Units, Open Phase in Power Supply Wiring 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 Transmission is not carried out normally for a certain amount of time...
  • Page 359 SiUS371901E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for details of error in monitor mode. U4-01 Refer to troubleshooting U4-03 (Indoor unit system transmission error) Check the power supply wiring.
  • Page 360 Troubleshooting by Error Code SiUS371901E Are the indoor-outdoor and outdoor-outdoor Modify the transmission transmission wirings wirings. normal? Disconnect the outdoor-outdoor transmission wiring. Replace the outdoor unit main Does the system normally PCB (A1P). operate with a single transmission line? Mount the DIII-NET extension adaptor.

  • Page 361: Transmission Error Between Remote Controller And Indoor Unit

    SiUS371901E Troubleshooting by Error Code 3.66 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 Conditions Supposed...

  • Page 362: Transmission Error Between Outdoor Units

    Troubleshooting by Error Code SiUS371901E 3.67 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 363 SiUS371901E 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 364 Troubleshooting by Error Code SiUS371901E Diagnosis Flowchart-1 U7-01 Error code Sub code (Transmission error when the external control adaptor is mounted) there any wiring disconnection or wiring error in the transmission Modify the transmission wirings wirings to the external to the external control adaptor for control adaptor for outdoor unit.
  • Page 365 SiUS371901E Troubleshooting by Error Code Diagnosis Flowchart-2 U7-02 Error code Sub code (Transmission error when the external control adaptor for outdoor unit is mounted) Unified Cool/ Heat Set Cool/Heat selection selection for the external control adaptor for outdoor unit to “IND.” Cool/Heat selection for the external control adaptor...
  • Page 366 Troubleshooting by Error Code SiUS371901E Diagnosis Flowchart-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 367 SiUS371901E Troubleshooting by Error Code Diagnosis Flowchart-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 368: Transmission Error Between Main And Sub Remote Controllers

    Troubleshooting by Error Code SiUS371901E 3.68 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 369: Transmission Error Between Indoor Units And Outdoor Units In The Same System

    SiUS371901E Troubleshooting by Error Code 3.69 Transmission Error between Indoor Units and Outdoor Units 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 370: Improper Combination Of Indoor, Branch Selector And Outdoor Units

    Troubleshooting by Error Code SiUS371901E 3.70 Improper Combination of Indoor, Branch Selector and Outdoor Units Error Code Applicable All indoor unit models Branch Selector unit Models All outdoor unit models Method of Error A difference occurs in data by the type of refrigerant between indoor, Branch Selector and outdoor units.
  • Page 371 SiUS371901E 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 372 Troubleshooting by Error Code SiUS371901E 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 373 SiUS371901E Troubleshooting by Error Code Diagnosis Flowchart-3 UA-20 Error code Sub code Multi connection? Replace the outdoor unit main PCB (A1P). Was the outdoor unit different model Replace the outdoor unit main PCB main PCB replaced with of outdoor unit is (A1P).
  • Page 374 Troubleshooting by Error Code SiUS371901E Diagnosis Flowchart-5 UA-25 Error code Sub code Is the wiring between outdoor unit Correct the wiring. and Branch Selector unit correct? Replace the outdoor unit main PCB (A1P). Diagnosis Flowchart-6 UA-26 Error code Sub code Is the wiring between Branch Selector Correct the wiring.
  • Page 375 SiUS371901E Troubleshooting by Error Code Diagnosis Flowchart-7 UA-27 Error code Sub code the transmission wires between indoor unit and Correct the transmission wires. Branch Selector unit correct? Is the Branch Selector unit PCB Replace the indoor unit PCB or the correct? Branch Selector unit PCB.
  • Page 376 Troubleshooting by Error Code SiUS371901E Diagnosis Flowchart-9 UA-53 Error code Sub code Is the DIP switch of the multi Branch Selector unit After turning OFF the power supply correct? of the multi Branch Selector unit, correct the DIP switch settings. Turn ON the power supply of the multi Branch Selector unit, and press the RETURN (BS3) button...

  • Page 377: Incorrect Gas Furnace Connecting Number

    SiUS371901E Troubleshooting by Error Code 3.71 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 378: Incorrect Electric Heater Capacity Setting

    Troubleshooting by Error Code SiUS371901E 3.72 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 379: Address Duplication Of Centralized Controller

    SiUS371901E Troubleshooting by Error Code 3.73 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 380: Transmission Error Between Centralized Controller And Indoor Unit

    Troubleshooting by Error Code SiUS371901E 3.74 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 381 SiUS371901E Troubleshooting by Error Code Check the transmission wiring between centralized controller for Correct the wiring. any broken wire. CHECK 15 Check the transmission wiring between main centralized controller for Correct the wiring. any broken wire. CHECK 15 the main centralized controller Correct the connection of the setting connector been...

  • Page 382: System Not Set Yet

    Troubleshooting by Error Code SiUS371901E 3.75 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 383: System Abnormality, Refrigerant System Address Undefined

    SiUS371901E Troubleshooting by Error Code 3.76 System Abnormality, Refrigerant System Address Undefined Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error Detect an indoor unit with no auto address setting. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected. Conditions Supposed Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor...
  • Page 384 Troubleshooting by Error Code SiUS371901E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Does electricity an error being introduced occur even after 12 for the first time after minutes elapses from the Normal installation or after an...

  • Page 385: Climate Talk Communication System Combination Error (Before Initial Setting For Communication Completes)

    SiUS371901E Troubleshooting by Error Code 3.77 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 386: (After Initial Setting For Communication Completes)

    Troubleshooting by Error Code SiUS371901E 3.78 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 387: Check

    SiUS371901E Check 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 388: Low Pressure Check

    Check SiUS371901E 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 Defective sensor (∗1.) corresponding to the measurement value of the pressure sensor? compressor Defective Defective outdoor unit...

  • Page 389: Superheat Operation Check

    SiUS371901E Check Superheat Operation Check CHECK 3 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Hot gas circuit clogging Defective hot Defective solenoid ← Are the coil resistance and insulation normal? gas bypass valve coil control Defective solenoid valve body...

  • Page 390: Power Transistor Check

    Check SiUS371901E 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 391 SiUS371901E Check REYQ144/168XATJU Point of Measurement and Judgment Criteria Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. When using the analog type of multimeter, When using the digital type of multimeter, make measurement in resistance make measurement in diode check mode measurement mode in the x1 kΩ...
  • Page 392 Check SiUS371901E REYQ72-120XAYDU Point of Measurement and Judgment Criteria Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. When using the analog type of multimeter, When using the digital type of multimeter, make measurement in resistance make measurement in diode check mode measurement mode in the x1 kΩ...
  • Page 393 SiUS371901E Check REYQ144/168XAYDU Point of Measurement and Judgment Criteria Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. When using the analog type of multimeter, When using the digital type of multimeter, make measurement in resistance make measurement in diode check mode measurement mode in the x1 kΩ...
  • Page 394 Check SiUS371901E REYQ72-168XAYCU Point of Measurement and Judgment Criteria Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. When using the analog type of multimeter, When using the digital type of multimeter, make measurement in resistance make measurement in diode check mode measurement mode in the x1 kΩ...

  • Page 395: Refrigerant Overcharge Check

    SiUS371901E Check Refrigerant Overcharge Check CHECK 6 In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgment, refer to the information below. Diagnosis of overcharge of refrigerant 1.

  • Page 396: Refrigerant Shortage Check

    Check SiUS371901E 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 397: Vacuuming And Dehydration Procedure

    SiUS371901E Check Vacuuming and Dehydration Procedure CHECK 8 Conduct vacuuming and dehydration in the piping system following the procedure for <Normal vacuuming and dehydration> described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for <Special vacuuming and dehydration>...

  • Page 398: Thermistor Check

    Check SiUS371901E 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 399 SiUS371901E Check 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 65.84 65.6705...
  • Page 400 Check SiUS371901E Thermistor temperature Resistance (kΩ) (°C) (°F) Type E Type H Type J –30 –22 362.4862 3257.371 359.8518 –25 –13 265.9943 2429.222 265.0699 –20 –4 197.3083 1827.883 197.1476 –15 147.8597 1387.099 147.7348 –10 111.8780 1061.098 111.7984 –5 85.4291 817.9329 85.3927 65.8000 635.0831...

  • Page 401: Pressure Sensor Check

    SiUS371901E Check 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 402: Broken Wire Check Of The Relay Wires

    Check SiUS371901E 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 403: Fan Motor Connector Check (Power Supply Cable)

    SiUS371901E Check 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 404: Fan Motor Connector Check (Signal Cable)

    Check SiUS371901E 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 405 SiUS371901E Check Outdoor unit REYQ-XATJU, REYQ-XAYDU (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 406: Electronic Expansion Valve Coil Check

    Check SiUS371901E 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 Y1E, Y3E, Y4E White (1)
  • Page 407 SiUS371901E Check 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 408 Check SiUS371901E Branch Selector unit (EVH, EVL) White (1) White (1) Yellow (2) φ1 Red (6) Measuring points Judgment criteria Orange (3) φ3 1 - 6 Orange (3) 2 - 6 Blue (4) 120-180 Ω φ2 φ4 3 - 6 —...

  • Page 409: Fan Motor Connector Check For Fxtq-Ta

    SiUS371901E 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 410 Check SiUS371901E 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 399). Blinking Rotating Replace motor control/end bell;...
  • Page 411 SiUS371901E 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 412 Check SiUS371901E 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 100 Ω or greater, the control/end bell is functioning properly. Replace the control/end bell if the resistance is lower than 100 Ω. 8.
  • Page 413 SiUS371901E Part 7 Appendix 1. Wiring Diagrams..................401 1.1 Outdoor Unit ..................... 401 1.2 Indoor Unit....................406 1.3 Air Treatment Equipment ................. 420 1.4 Branch Selector Unit ................423 Appendix...

  • Page 414: Wiring Diagrams

    Wiring Diagrams SiUS371901E 1. Wiring Diagrams Outdoor Unit REYQ72/96/120XATJU Appendix...
  • Page 415 SiUS371901E Wiring Diagrams REYQ144/168XATJU Appendix...
  • Page 416 Wiring Diagrams SiUS371901E REYQ72/96/120XAYDU Appendix...
  • Page 417 SiUS371901E Wiring Diagrams REYQ144/168XAYDU Appendix...
  • Page 418 Wiring Diagrams SiUS371901E REYQ72/96/120/144/168XAYCU Appendix...

  • Page 419: Indoor Unit

    SiUS371901E Wiring Diagrams Indoor Unit FXFQ07/09/12/15/18/24/30/36/48TVJU Appendix...
  • Page 420 Wiring Diagrams SiUS371901E BYCQ125BGW1 (Self-Cleaning Decoration Panel for FXFQ-TVJU) Appendix...
  • Page 421 SiUS371901E Wiring Diagrams FXZQ05/07/09/12/15/18TAVJU Appendix...
  • Page 422 Wiring Diagrams SiUS371901E FXUQ18/24/30/36PVJU Appendix...
  • Page 423 SiUS371901E Wiring Diagrams FXEQ07/09/12/15/18/24PVJU Appendix...
  • Page 424 Wiring Diagrams SiUS371901E FXDQ07/09/12/18/24MVJU Appendix...
  • Page 425 SiUS371901E Wiring Diagrams FXSQ05/07/09/12/15/18/24/30/36/48/54TAVJU Appendix...
  • Page 426 Wiring Diagrams SiUS371901E FXMQ07/09/12/15/18/24/30/36/48/54PBVJU Appendix...
  • Page 427 SiUS371901E Wiring Diagrams FXMQ72/96MVJU Appendix...
  • Page 428 Wiring Diagrams SiUS371901E FXHQ12/24/36MVJU Appendix...
  • Page 429 SiUS371901E Wiring Diagrams FXAQ07/09/12/18/24PVJU Appendix...
  • Page 430 Wiring Diagrams SiUS371901E FXLQ07/09/12/18/24MVJU, FXNQ07/09/12/18/24MVJU Appendix...
  • Page 431 SiUS371901E Wiring Diagrams 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 432 Wiring Diagrams SiUS371901E CXTQ24/36/48/60TASBLU Appendix...

  • Page 433: Air Treatment Equipment

    SiUS371901E Wiring Diagrams Air Treatment Equipment 1.3.1 Outdoor-Air Processing Unit FXMQ48/72/96MFVJU Appendix...
  • Page 434 Wiring Diagrams SiUS371901E 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Appendix...
  • Page 435 SiUS371901E Wiring Diagrams VAM1200GVJU Appendix...

  • Page 436: Branch Selector Unit

    Wiring Diagrams SiUS371901E Branch Selector Unit 1.4.1 Single Branch Selector Unit BSQ36/60/96TVJ Appendix...
  • Page 437 SiUS371901E Wiring Diagrams 1.4.2 Multi Branch Selector Unit BS4Q54TVJ 3D089123B Appendix...
  • Page 438 Wiring Diagrams SiUS371901E BS6/8Q54TVJ Appendix...
  • Page 439 SiUS371901E Wiring Diagrams BS10/12Q54TVJ Appendix...
  • Page 440 Revision History Month / Year Version Revised contents 04 / 2019 SiUS371901E First edition...
  • Page 441 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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