Daikin VRV S RXQ4/5ARV1 Service Manual
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Daikin VRV S RXQ4/5ARV1 Service Manual

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SiAF332111E
Service
Manual
RXQ4/5ARV1
RXMQ6ARV1
RXMQ8/10/12ARY1
Cooling Only 50/60 Hz

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Summary of Contents for Daikin VRV S RXQ4/5ARV1

  • Page 1 SiAF332111E Service Manual RXQ4/5ARV1 RXMQ6ARV1 RXMQ8/10/12ARY1 Cooling Only 50/60 Hz...
  • Page 2 SiAF332111E Introduction ..................1 1. Safety Cautions..................2 1.1 Warnings and Cautions Regarding Safety of Workers......2 1.2 Warnings and Cautions Regarding Safety of Users.........4 2. Icons Used ....................6 3. Revision History ..................7 Part 1 General Information ............8 1. Model Names ..................9 1.1 Outdoor Unit .....................9 1.2 VRV Indoor Unit ..................9 2.
  • Page 3 SiAF332111E Part 4 Functions and Control ............54 1. Control for 4/5/10/12 HP Outdoor Unit ..........55 1.1 Operation Mode..................55 1.2 Basic Control ..................56 1.3 Special Control ..................60 1.4 Protection Control...................63 1.5 Other Control..................67 2. Control for 6/8 HP Outdoor Unit ............68 2.1 Operation Flowchart ................68 2.2 Stop Control ...................69 2.3 Standby Control..................69...
  • Page 4 SiAF332111E 3.7 Eco Mode Setting .................143 3.8 Night-Time Low Noise Operation and Demand Operation....144 4. Field Settings for Outdoor Unit (10/12 HP Models)......148 4.1 Capacity Setting ...................148 4.2 BS Buttons and DIP Switches ..............149 5. Test Operation (4/5/10/12 HP Models) ..........161 5.1 Check Work Prior to Turning Power Supply ON ........161 5.2 Turn Power ON ..................161 5.3 Test Operation (4/5 HP Models)............162...
  • Page 5 SiAF332111E 5.20 Infrared Presence/Floor Sensor Error ..........224 5.21 Remote Controller Thermistor Abnormality ..........229 5.22 Outdoor Unit Main PCB Abnormality............230 5.23 Current Leakage Detection ..............231 5.24 Missing of Leakage Detection Core .............232 5.25 Activation of High Pressure Switch ............233 5.26 Activation of Low Pressure Sensor ............235 5.27 Compressor Motor Lock ...............237 5.28 Compressor Damage Alarm..............239 5.29 Outdoor Fan Motor Abnormality ............241...
  • Page 6 SiAF332111E 5.68 System Abnormality, Refrigerant System Address Undefined .....326 5.69 Defective PCB ..................327 5.70 Transmission Error (between Centralized Controllers) ......328 5.71 Poor Centralized Controller Combination..........329 5.72 Address Duplication, Poor Setting............330 5.73 Operation Lamp Blinking ..............331 5.74 Central Control Indicator Lamp Blinking (One blink) ......333 5.75 Central Control Indicator Lamp Blinking (Two blinks) ......336 6.
  • Page 7 SiAF332111E Introduction 1. Safety Cautions..................2 1.1 Warnings and Cautions Regarding Safety of Workers......2 1.2 Warnings and Cautions Regarding Safety of Users.........4 2. Icons Used ....................6 3. Revision History ..................7 Introduction...
  • Page 8 Safety Cautions SiAF332111E 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.
  • Page 9 SiAF332111E Safety Cautions Warning Do not turn the air conditioner on or off by plugging in or unplugging the power cable. Plugging in or unplugging the power cable to operate the equipment may cause an electrical shock or fire. Be sure to wear a safety helmet, gloves, and a safety belt when working in a high place (more than 2 m).
  • Page 10 Safety Cautions SiAF332111E Warnings and Cautions Regarding Safety of Users Warning Do not store the equipment in a room with fire sources (e.g., naked flames, gas appliances, electric heaters). Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work.
  • Page 11 SiAF332111E Safety Cautions Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely. If the plug is dusty or has a loose connection, it may cause an electrical shock or fire.
  • Page 12 Icons Used SiAF332111E 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning Warning is used when there is danger of personal injury. Warning Caution Caution is used when there is danger that the reader, Caution through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part...
  • Page 13 SiAF332111E Revision History 3. Revision History Month / Year Version Revised contents 12 / 2021 SiAF332111E First edition Introduction...

  • Page 14: Table Of Contents

    SiAF332111E Part 1 General Information 1. Model Names ..................9 1.1 Outdoor Unit .....................9 1.2 VRV Indoor Unit ..................9 2. External Appearance................10 2.1 Outdoor Unit ...................10 2.2 VRV Indoor Unit ..................10 3. Capacity Range..................11 3.1 Connection Ratio..................11 3.2 Outdoor Unit Combinations ..............11 4.

  • Page 15: Model Names

    SiAF332111E Model Names 1. Model Names Outdoor Unit Capacity range Power 11.2 14.0 16.0 22.4 28.0 33.5 supply, Standard Capacity index Cooling Only — — — — — — — — — RXMQ — — — 10AR 12AR V1: 1 phase, 220-240 V, 50/60 Hz Y1: 3 phase, 380-415 V, 50/60 Hz VRV Indoor Unit Capacity range...

  • Page 16: External Appearance

    External Appearance SiAF332111E 2. External Appearance Outdoor Unit 4, 5 HP 6, 8 HP 10, 12 HP RXQ4ARV1 RXMQ6ARV1 RXMQ10ARY1 RXQ5ARV1 RXMQ8ARY1 RXMQ12ARY1 VRV Indoor Unit Ceiling mounted cassette Round flow cassette with sensing FXFSQ-AR Ceiling concealed duct Middle-high static pressure duct FXMQ-PB FXMQ-AR Wall mounted...

  • Page 17: Capacity Range

    SiAF332111E Capacity Range 3. Capacity Range Connection Ratio Total capacity index of the indoor units Connection ratio = Capacity index of the outdoor units Type Min. connection ratio Max. connection ratio Single outdoor units 130% Outdoor Unit Combinations Model RXQ4ARV1 RXQ5ARV1 RXMQ6ARV1 RXMQ8ARY1...

  • Page 18: Specifications

    Specifications SiAF332111E 4. Specifications Model Name RXQ4ARV1 RXQ5ARV1 Power supply 1 phase, 220-240 V, 50/60 Hz 1 phase, 220-240 V, 50/60 Hz 1 Cooling capacity 11.2 14.0 Casing color Ivory white Ivory white Dimensions: (H × W × D) 990 × 940 × 320 990 ×...
  • Page 19 SiAF332111E Specifications Model Name RXMQ6ARV1 RXMQ8ARY1 Power supply 1 phase, 220-240 V, 50/60 Hz 3 phase, 380-415 V, 50/60 Hz 1 Cooling capacity 16.0 22.4 Casing color Ivory white (5Y7.5/1) Ivory white (5Y7.5/1) Dimensions: (H × W × D) 870 × 1,100 × 460 870 ×...
  • Page 20 Specifications SiAF332111E Model Name RXMQ10ARY1 RXMQ12ARY1 Power supply 3 phase, 380-415 V, 50/60 Hz 3 phase, 380-415 V, 50/60 Hz 1 Cooling capacity 28.0 33.5 Casing color Ivory white Ivory white Dimensions: (H × W × D) 1,627 × 940 × 460 1,627 ×...
  • Page 21 SiAF332111E Part 2 Refrigerant Circuit 1. Refrigerant Circuit (Piping Diagrams) ...........16 1.1 Outdoor Unit ...................16 1.2 VRV Indoor Unit ..................25 2. Functional Parts Layout ................26 2.1 RXQ4ARV1 ....................26 2.2 RXQ5ARV1 ....................28 2.3 RXMQ6ARV1 ..................30 2.4 RXMQ8ARY1 ..................31 2.5 RXMQ10/12ARY1 ..................32 Part 2 Refrigerant Circuit...

  • Page 22: Refrigerant Circuit Part

    Refrigerant Circuit (Piping Diagrams) SiAF332111E 1. Refrigerant Circuit (Piping Diagrams) Outdoor Unit 1.1.1 RXQ4ARV1 No. in Electric piping Name Function Symbol diagram Compressor motor Compressor is operated in multi-steps according to Te. Fan motor The fan rotation speed is varied by using inverter. Solenoid valve Used to prevent the low pressure from transient falling.
  • Page 23 SiAF332111E Refrigerant Circuit (Piping Diagrams) Part 2 Refrigerant Circuit...
  • Page 24 Refrigerant Circuit (Piping Diagrams) SiAF332111E 1.1.2 RXQ5ARV1 No. in Electric piping Name Function Symbol diagram Compressor motor Compressor is operated in multi-steps according to Te. Fan motor The fan rotation speed is varied by using inverter. Solenoid valve Used for unloading operation of compressor. (Unload circuit) S1NPH High pressure sensor...
  • Page 25 SiAF332111E Refrigerant Circuit (Piping Diagrams) Part 2 Refrigerant Circuit...
  • Page 26 Refrigerant Circuit (Piping Diagrams) SiAF332111E 1.1.3 RXMQ6ARV1, RXMQ8ARY1 No. in Electric piping Name Function symbol diagram Compressor motor Inverter driven compressor is operated in multi-steps according to Te. Fan motor The fan rotation speed is varied by using the inverter. Electronic expansion PI control is applied to keep the outlet superheating degree of subcooling heat valve (Injection)
  • Page 27 SiAF332111E Refrigerant Circuit (Piping Diagrams) RXMQ6ARV1 Part 2 Refrigerant Circuit...
  • Page 28 Refrigerant Circuit (Piping Diagrams) SiAF332111E RXMQ8ARY1 Part 2 Refrigerant Circuit...
  • Page 29 SiAF332111E Refrigerant Circuit (Piping Diagrams) 1.1.4 RXMQ10/12ARY1 No. in Electric piping Name Function symbol diagram Compressor motor Compressor is operated on frequencies between 60 Hz and 387.3 Hz by using the inverter. Fan motor Since the system is of air heat exchanging type, the fan is operated at 8-step rotation speed by using the inverter.
  • Page 30 Refrigerant Circuit (Piping Diagrams) SiAF332111E Electronic expansion (17) Double tube valve (Y1E) Filter Heat exchanger (11) Heat sink PCB (14) Pressure regulating valve Heat exchanger Electronic (16) expansion valve (Y2E) Service Port (13) Four way valve (Y1S) High pressure sensor (S1NPH) Check valve Low pressure sensor...

  • Page 31: Vrv Indoor Unit

    SiAF332111E Refrigerant Circuit (Piping Diagrams) VRV Indoor Unit No. in piping Electric Name Applicable model Function diagram symbol Electronic expansion valve All indoor units Used for gas superheated degree control while in cooling. Suction air thermistor All indoor units Used for thermostat control. Indoor liquid pipe thermistor All indoor units Used for gas superheated degree...

  • Page 32: Functional Parts Layout

    Functional Parts Layout SiAF332111E 2. Functional Parts Layout RXQ4ARV1 Front view Solenoid valve coil (Hot gas bypass pipe) (Y2S) Solenoid valve coil (Unload circuit) (Y3S) Thermistor (Discharge pipe) Fan motor (R2T) (M1F) Low pressure sensor High pressure (S1NPL) switch (S1PH) High pressure sensor (S1NPH)
  • Page 33 SiAF332111E Functional Parts Layout Bird’s-eye view Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P544577E Part 2 Refrigerant Circuit...

  • Page 34: Rxq5Arv1

    Functional Parts Layout SiAF332111E RXQ5ARV1 Front view Thermistor (Suction pipe 2) Fan motor (R5T) Thermistor (Discharge pipe) (R2T) Thermistor (Outdoor air) (R1T) Thermistor (Suction pipe 1) (R3T) Thermistor (Heat exchanger deicer) (R4T) C: 1P544363C Part 2 Refrigerant Circuit...
  • Page 35 SiAF332111E Functional Parts Layout Bird’s-eye view Solenoid valve coil (Unload circuit) (Y3S) High pressure sensor (S1NPH) Low pressure sensor High pressure switch (S1NPL) (S1PH) Compressor motor (M1C) C: 1P544337E Part 2 Refrigerant Circuit...

  • Page 36: Rxmq6Arv1

    Functional Parts Layout SiAF332111E RXMQ6ARV1 Top View Thermistor (Subcooling heat exchanger gas pipe) (R6T) Thermistor (Suction pipe) (R3T) High pressure sensor (S1NPH) High pressure switch Thermistor (Discharge pipe) (S1PH) (R21T) Side View Low pressure sensor (S1NPL) Electronic expansion valve (Refrigerant auto charge) (Y4E) Thermistor (Outdoor Air) (R1T)

  • Page 37: Rxmq8Ary1

    SiAF332111E Functional Parts Layout RXMQ8ARY1 Top View Thermistor (Subcooling heat exchanger gas pipe) (R6T) Low pressure sensor (S1NPL) High pressure sensor Thermistor (Suction pipe) (S1NPH) (R3T) High pressure switch (S1PH) Thermistor (Discharge pipe) (R21T) Side View Thermistor (Outdoor air) (R1T) Electronic expansion valve (Refrigerant auto charge) (Y4E)

  • Page 38: Rxmq10/12Ary1

    Functional Parts Layout SiAF332111E RXMQ10/12ARY1 Front view Fan motor (M1F) Thermistor (Accumulator) (R3T) Electronic expansion valve (Main) (Y1E) Electronic expansion valve (Injection) (Y2E) Thermistor (Discharge pipe) (R21T) Fan motor (M2F) Thermistor (Compressor body) (R8T) Crankcase heater Compressor motor (E1HC) (M1C) C: 1P562067C Part 2 Refrigerant Circuit...
  • Page 39 SiAF332111E Functional Parts Layout Bird's eye view Thermistor (Outdoor air) (R1T) Thermistor (Heat exchanger liquid pipe) (R4T) Solenoid valve (Accumulator oil return) (Y2S) Thermistor (Heat exchanger deicer) (R7T) C: 1P562067C Part 2 Refrigerant Circuit...
  • Page 40 Functional Parts Layout SiAF332111E Bird's eye view Thermistor (Subcooling heat exchanger gas pipe) (R6T) High pressure sensor (S1NPH) Low pressure sensor (S1NPL) High pressure switch (S1PH) Thermistor (Subcooling liquid pipe) (R5T) C: 1P562067C Part 2 Refrigerant Circuit...
  • Page 41 SiAF332111E Part 3 Remote Controller 1. Applicable Models .................36 2. Names and Functions ................38 2.1 BRC1E63 ....................38 2.2 BRC4M Series..................40 3. Main/Sub Setting...................43 3.1 Wired Remote Controller (BRC1E63) ............43 3.2 When Wireless Remote Controller is Used Together......44 4. Address Setting for Wireless Remote Controller........45 4.1 Setting for Signal Receiver PCB ............45 4.2 Setting for BRC4M Series ..............46 4.3 Multiple Settings A/b................47...

  • Page 42: Applicable Models

    Applicable Models SiAF332111E 1. Applicable Models Wired remote controller Wireless remote controller Series Navigation Remote controller Receiver FXFSQ-AR (1) BRC7M632F-6 FXMQ-PB BRC1E63 BRC4M151W16 BRC4M61-6 FXMQ-AR FXAQ-P BRC7N618-6 Note(s) 1. Some functions are not available depending on the remote controller type. Refer to page 37 for details.
  • Page 43 SiAF332111E Applicable Models Function list FXFSQ-AR Category Function BRC1E63 BRC4M151 ON/OFF operation ● ● Setting temperature ● ● Swing pattern selection ● ● Switchable fan speed (Ventilation amount) ● ● Display switching function ● — Basic performance Backlight function ● ●...

  • Page 44: Names And Functions

    Names and Functions SiAF332111E 2. Names and Functions BRC1E63 (6) Right button (1) Mode Selector button Used to highlight the next items on the Used to select the operation mode. right-hand side. (2) Airflow Setting button Display contents are changed to next Used to indicate the Airflow Rate (Air screen per page.
  • Page 45 SiAF332111E Names and Functions Mode Access Operation On power-up, the message Checking the connection. Please stand by. will be displayed on the remote controller screen. Then that message will disappear and the basic screen will be displayed. To access a mode from the basic screen, refer to the figure below. When any of the operation buttons is pressed, the backlight will come on and remains lit for about 30 seconds.

  • Page 46: Brc4M Series

    Names and Functions SiAF332111E BRC4M Series 2.2.1 Remote Controller FAN SPEED CONTROL BUTTON DISPLAY (SIGNAL TRANSMISSION) Press this button to select the fan speed. This blinks when a signal is being transmitted. TEMPERATURE SETTING BUTTON DISPLAY (OPERATION MODE) Use this button for SETTING TEMPERATURE. This display shows the current OPERATION BACKLIGHT BUTTON MODE.
  • Page 47 SiAF332111E Names and Functions 2.2.2 Signal Receiver EMERGENCY OPERATION SWITCH This switch is readily used if the remote controller does not work. RECEIVER This receives the signals from the remote controller. OPERATING INDICATOR LAMP (Red) This lamp stays lit while the air conditioner runs.
  • Page 48 Names and Functions SiAF332111E 2.2.3 How to Check Initial Set Value Press the INSPECTION button to check the initial set value. Press the INSPECTION button twice to return to the normal mode. Initial set value Indoor unit model type Initial set value Ceiling mounted cassette FXFSQ-AR 2111...

  • Page 49: Main/Sub Setting

    SiAF332111E Main/Sub Setting 3. Main/Sub Setting Main/Sub setting is necessary when 1 indoor unit is controlled by 2 remote controllers. The remote controllers are set at factory to Main, so you have to change one remote controller from Main to Sub. To change a remote controller from Main to Sub, proceed as follows: Wired Remote Controller (BRC1E63) 3.1.1 Field Settings The designation of the main and sub remote controllers can be swapped.

  • Page 50: When Wireless Remote Controller Is Used Together

    Main/Sub Setting SiAF332111E When Wireless Remote Controller is Used Together When using both a wired and a wireless remote controller for 1 indoor unit, the wired controller should be set to Main. Therefore, the Main/Sub switch (SS1) of the signal receiver PCB must be set to Sub.

  • Page 51: Address Setting For Wireless Remote Controller

    SiAF332111E 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 52: Setting For Brc4M Series

    Address Setting for Wireless Remote Controller SiAF332111E Setting for BRC4M Series The address for the wireless remote controller is set to 1 at the factory. To change the setting, proceed as follows: 1. Press the FILTER SIGN RESET button and the INSPECTION button for at least 4 seconds to enter the Field Setting mode.

  • Page 53: Multiple Settings A/B

    SiAF332111E Address Setting for Wireless Remote Controller Multiple Settings A/b The command such as operation mode or temperature setting by this remote controller will be rejected when the target indoor unit operation is restricted as by an external control such as centralized control.

  • Page 54: Centralized Control Group No. Setting

    Centralized Control Group No. Setting SiAF332111E 5. Centralized Control Group No. Setting BRC1E63 Group No. Setting (Group) Basic screen is displayed. Press and hold Press the Cancel the Cancel button button once. for 4 seconds or more. Select Group Address and then press the Menu/Enter button.

  • Page 55: Group No. Setting Example

    SiAF332111E Centralized Control Group No. Setting Group No. Setting (Unit) Basic screen is displayed. Press and hold Press the Cancel the Cancel button button once. for 4 seconds or Select Group Address more. and then press the Menu/Enter button. Service Item 2 is settings menu displayed.

  • Page 56: Service Settings Menu, Maintenance Menu

    Service Settings Menu, Maintenance Menu SiAF332111E 6. Service Settings Menu, Maintenance Menu BRC1E63 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 57 SiAF332111E Service Settings Menu, Maintenance Menu 6.1.1 Service Settings Menu Service settings menu Item 2 Remarks Test Operation — — Maintenance Contact None — Maintenance Contact —, 0 to 9 (in order) Field Settings Indoor Unit No. — Mode No. —...
  • Page 58 Service Settings Menu, Maintenance Menu SiAF332111E 6.1.2 Maintenance Menu Maintenance Item 2 Remarks Menu Model Name Unit No. Select the unit number you want to check. Indoor unit The model names are displayed. (A model code may be displayed instead, depending on Outdoor unit the particular model.) R-32 mark display...
  • Page 59 SiAF332111E Service Settings Menu, Maintenance Menu Maintenance Item 2 Remarks Menu Addressed Unit No.: 0 - 15 Select the unit number you want to check. Sensor Code Value Remote controller thermistor (°C) Suction air thermistor (°C) 5 Heat exchanger liquid pipe thermistor (°C) Heat exchanger gas pipe thermistor (°C) Indoor unit address No.
  • Page 60 SiAF332111E Part 4 Functions and Control 1. Control for 4/5/10/12 HP Outdoor Unit ..........55 1.1 Operation Mode..................55 1.2 Basic Control ..................56 1.3 Special Control ..................60 1.4 Protection Control...................63 1.5 Other Control..................67 2. Control for 6/8 HP Outdoor Unit ............68 2.1 Operation Flowchart ................68 2.2 Stop Control ...................69 2.3 Standby Control..................69 2.4 Startup Control ..................70...

  • Page 61: Control For 4/5/10/12 Hp Outdoor Unit

    SiAF332111E Control for 4/5/10/12 HP Outdoor Unit 1. Control for 4/5/10/12 HP Outdoor Unit Operation Mode Operation in stop control Indoor unit stop or Indoor unit thermostat ON thermostat OFF Error/Standby Restart standby Pressure (Compressor stop) equalization prior to startup Error/ Standby Indoor unit stop or...

  • Page 62: Basic Control

    Control for 4/5/10/12 HP Outdoor Unit SiAF332111E Basic Control 1.2.1 Normal Control Cooling Operation Electric symbol Outdoor unit Operation Remarks RXMQ actuator RXQ4ARV1 RXQ5ARV1 10/12ARY1 Compressor Compressor PI Used for high pressure protection control, control low pressure protection control, discharge pipe temperature protection control, and compressor operating frequency upper limit control with inverter protection control.
  • Page 63 SiAF332111E Control for 4/5/10/12 HP Outdoor Unit 1.2.2 Compressor PI Control Carries out compressor capacity control to maintain Te at constant during cooling operation thus ensuring stable unit performance. Cooling operation Controls compressor capacity to achieve target Te value (TeS). ...
  • Page 64 Control for 4/5/10/12 HP Outdoor Unit SiAF332111E 10/12 HP Step Frequency (Hz) Step Frequency (Hz) Step Frequency (Hz) 60.0 112.8 210.3 60.9 114.3 213.0 61.8 115.8 215.7 62.7 117.3 218.4 63.6 118.8 221.1 64.5 120.3 223.8 65.4 121.8 226.5 66.3 123.3 229.2 67.2...
  • Page 65 SiAF332111E Control for 4/5/10/12 HP Outdoor Unit 1.2.3 Electronic Expansion Valve PI Control Injection Electronic Expansion Valve Control Performs PI control of the electronic expansion valve Y2E (RXMQ10/12ARY1) to keep the superheating degree (SH) of the outlet gas pipe on the evaporator side for full use of the subcooling heat exchanger.

  • Page 66: Special Control

    Control for 4/5/10/12 HP Outdoor Unit SiAF332111E Special Control 1.3.1 Startup Control This control is used to equalize the pressure in the suction and discharge sides of the compressor prior to the compressor startup, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.
  • Page 67 SiAF332111E Control for 4/5/10/12 HP Outdoor Unit 1.3.2 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. Oil Return Control in Cooling Operation HTdi: Compressor discharge pipe temperature (Tdi) compensated with outdoor air temperature Pe: Low pressure sensor detection value...
  • Page 68 Control for 4/5/10/12 HP Outdoor Unit SiAF332111E 1.3.3 Pump Down Residual Control When activating the compressor, if liquid refrigerant remains in the evaporator, the liquid enters the compressor and dilutes oil therein resulting in a decrease in lubricity. Therefore, pump down residual control is performed to collect refrigerant in the evaporator when the compressor is stopped.

  • Page 69: Protection Control

    SiAF332111E Control for 4/5/10/12 HP Outdoor Unit Protection Control 1.4.1 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 transient increase in high pressure.
  • Page 70 Control for 4/5/10/12 HP Outdoor Unit SiAF332111E 1.4.2 Low Pressure Protection Control This low pressure protection control is used to protect compressors against transient decreases in low pressure. Cooling operation Low pressure not limited Pe: Low pressure sensor detection value Pe <...
  • Page 71 SiAF332111E Control for 4/5/10/12 HP Outdoor Unit 1.4.4 Inverter Protection Control Inverter current protection control and inverter fin temperature control are performed to prevent tripping due to abnormality, transient inverter overcurrent, and fin temperature increase. Inverter overcurrent protection control Model A (A) B (A) 13.7...
  • Page 72 Control for 4/5/10/12 HP Outdoor Unit SiAF332111E Radiation fin temperature control Model A (˚C) B (˚C) C (˚C) 10/12HP Not limited • Tfin < B (˚C) & Tfin ≥ A (˚C) Compressor upper limit: Maximum frequency • Tfin: Fin thermistor temperature Limited Compressor upper limit frequency: 1-step down from...

  • Page 73: Other Control

    SiAF332111E Control for 4/5/10/12 HP Outdoor Unit Other Control 1.5.1 Demand Control In order to limit the power consumption, the capacity of outdoor unit is forcibly reduced by using Demand 1 Setting. To enable this operation, additional setting of Constant Demand Setting is required.

  • Page 74: Control For 6/8 Hp Outdoor Unit

    Control for 6/8 HP Outdoor Unit SiAF332111E 2. Control for 6/8 HP Outdoor Unit Operation Flowchart For detailed description of each function in the flow below, refer to the details on related function on the following pages. Stop control (1) Abnormal shutdown Special control Standby control (1) Restart standby...

  • Page 75: Stop Control

    SiAF332111E Control for 6/8 HP Outdoor Unit Stop Control 2.2.1 Abnormal Shutdown In order to protect compressors, if any of the abnormal state occurs, the system will make "stop with thermostat OFF" and the error will be determined according to the number of retry times. (Refer to Error Codes and Descriptions on page 190 for the items to determine the error.) Standby Control 2.3.1 Restart Standby...

  • Page 76: Startup Control

    Control for 6/8 HP Outdoor Unit SiAF332111E Startup Control This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.
  • Page 77 SiAF332111E Control for 6/8 HP Outdoor Unit 2.5.2 Compressor Control In order to provide a steady capacity, the compressor capacity is controlled to achieve temperature Te during cooling operation. During cooling operation The compressor capacity is controlled so Te approaches TeS (target value of temperature). 1.
  • Page 78 Control for 6/8 HP Outdoor Unit SiAF332111E 2.5.3 Compressor Capacity Control Te: Low pressure equivalent saturation temperature Capacity steps The compressor rotation speed is changed according to the control pressure.  Cooling: suction pressure sensor value is converted into evaporation saturated temperature (relation between pressure and evaporating temperature based on characteristics of refrigerant R-410A).
  • Page 79 SiAF332111E Control for 6/8 HP Outdoor Unit 2.5.4 Compressor Step Control  The actual rotation speed per second of the compressor (rps) depends on the type of compressor.  The control can skip a number of steps to reach faster the target saturation temperature. RXMQ6ARV1 RXMQ8ARY1 Frequency (Hz)
  • Page 80 Control for 6/8 HP Outdoor Unit SiAF332111E 2.5.5 Electronic Expansion Valve Control Electronic expansion valve Y1E  Cooling: electronic expansion valve is used only at fully closed or fully open condition:  Compressor(s) OFF: fully closed (0 pulse).  Compressor ON: ...

  • Page 81: Protection Control

    SiAF332111E Control for 6/8 HP Outdoor Unit Protection Control 2.6.1 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 82 Control for 6/8 HP Outdoor Unit SiAF332111E 2.6.3 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. Normal control Discharge pipe Discharge pipe temperature >...
  • Page 83 SiAF332111E Control for 6/8 HP Outdoor Unit Graph B Ta (°C) Inverter overcurrent protection control by secondary current [CTi2] Normal control Compressor max step Next compressor rps is lower than current rps & Set current step as max limit Reduce compressor step Inverter current standby Condition Secondary current [CTi2] (A)
  • Page 84 Control for 6/8 HP Outdoor Unit SiAF332111E 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 All compressors more than 91 °C less than 89 °C...

  • Page 85: Special Control

    SiAF332111E Control for 6/8 HP Outdoor Unit Special Control 2.7.1 Pump Down Residual Control Pc : High pressure sensor detection value Pe : Low pressure sensor detection value To avoid refrigerant emigration when outdoor unit stops operation (thermostat or safety), all electronic expansion valves are closed.

  • Page 86: Outline Of Control (Indoor Unit)

    Outline of Control (Indoor Unit) SiAF332111E 3. Outline of Control (Indoor Unit) Set Temperature and Control Target Temperature The relationship between remote controller set temperature and control target temperature is described below. Temperature ˚C Remote controller set temperature Cooling Control target temperature Examples are given to illustrate a control target temperature that satisfies the remote controller set temperature.

  • Page 87: Automatic Airflow Rate Control

    SiAF332111E Outline of Control (Indoor Unit) 3.2.2 With Optional Infrared Presence/Floor Sensor The thermostat ON/OFF condition is determined by the difference between the remote controller set temperature and the detected temperature around people.  Normal operation  Cooling operation ΔT ≤ –1.0°C Normal operation Thermostat OFF (Thermostat ON)

  • Page 88: Airflow Direction Control

    Outline of Control (Indoor Unit) SiAF332111E <Change in airflow rate under Fan tap automatic airflow rate control> Except for FXFSQ-AR, HM and ML taps appear only during the auto airflow rate control operation. (For FXFSQ-AR, HM and ML taps can be manually set with remote controller.) Small...

  • Page 89: Auto Draft Reducing Control (Fxfsq-Ar Only)

    SiAF332111E Outline of Control (Indoor Unit) Indoor unit Flap position (Horizontal view) Auto Draft Reducing Control (FXFSQ-AR only) In the case where both this control is activated and auto airflow direction control (eco full automatic control) is set, when human presence is detected, the airflow direction is automatically set to horizontal (P0) to reduce discomfort by direct airflow.
  • Page 90 Outline of Control (Indoor Unit) SiAF332111E 3.7.2 If the Float Switch is OFF with the Thermostat ON in Cooling Operation ∗1 ∗2 ∗3 Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec. 5 min. 5 sec.  When the float switch turns OFF, the thermostat turns OFF simultaneously. ...
  • Page 91 SiAF332111E Outline of Control (Indoor Unit) 3.7.4 If the Float Switch Turns OFF and ON Continuously, or the Float Switch Turns OFF While AF Displayed ∗3 ∗1 ∗2 Float switch Thermostat (running) Error display Drain pump 5 min. 5 min. 5 min.

  • Page 92: Freeze-Up Prevention Control

    Outline of Control (Indoor Unit) SiAF332111E Freeze-Up Prevention Control Freeze-Up Prevention by Off Cycle (Indoor Unit Individual Control) When the temperature detected by 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 93: Dew Condensation Prevention Control

    SiAF332111E Outline of Control (Indoor Unit) Dew Condensation Prevention Control 3.9.1 FXFSQ-AR Models Indoor operation under a certain condition will limit the swing range of the flaps. Position P0 continues for 30 minutes. Dew condensation Dew condensation prevention control OFF prevention control in action Thermostat OFF Refer to the table below for flap action under this control.

  • Page 94: Electronic Expansion Valve Control

    Outline of Control (Indoor Unit) SiAF332111E 3.10 Electronic Expansion Valve Control Electronic expansion valves in indoor units have the functions of conducting superheating degree control in cooling 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 95 SiAF332111E Outline of Control (Indoor Unit) 3.11.2 Operational Concept (Standard Panel) Cooling : Factory setting Movement pattern 01: Pattern 1 120 600 120 600 Appearance 02: Pattern 2 Time (seconds) 03: Pattern 3 13 (23)-14 04: Pattern 4 Indicates the horizontal flap is in the position of reducing airflow volume (the flap is inverted). 3.11.3 Operational Concept (Designer Panel) Cooling : Factory setting...
  • Page 96 SiAF332111E Part 5 Field Settings and Test Operation 1. Field Settings for Indoor Unit..............91 1.1 Field Settings with Remote Controller ............91 1.2 List of Field Settings for Indoor Unit ............94 1.3 Applicable Field Settings ................96 1.4 Details of Field Settings for Indoor Unit..........97 1.5 Operation Control Mode ...............108 2.

  • Page 97: Field Settings For Indoor Unit

    SiAF332111E 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.
  • Page 98 Field Settings for Indoor Unit SiAF332111E Press Menu/Enter button. Setting Setting confirmation screen confirmation screen is displayed. Select Yes and press Menu/Enter button. Setting details are determined and field settings screen returns. In the case of multiple setting changes, repeat (3) to (7). After all setting changes are completed, press Cancel button twice.
  • Page 99 SiAF332111E Field Settings for Indoor Unit 1.1.2 BRC4M Series Mode No. First code Second code No. Setting To set the field settings, you have to change:  Mode No.  First code No.  Second code No. To change the field settings, proceed as follows: 1.

  • Page 100: List Of Field Settings For Indoor Unit

    Field Settings for Indoor Unit SiAF332111E List of Field Settings for Indoor Unit : Factory setting Mode First Second Code No. Reference Code Description Page (2) Filter Ultra long life Approx. Approx. cleaning filter 10,000 5,000 sign interval hrs. hrs. Long life filter Approx.
  • Page 101 SiAF332111E Field Settings for Indoor Unit Mode First Second Code No. Reference Code Description Page (2) Ceiling height setting, Setting of Refer to the page on the right for details. normal airflow Airflow direction setting 4-way airflow 3-way airflow 2-way airflow —...

  • Page 102: Applicable Field Settings

    Field Settings for Indoor Unit SiAF332111E Applicable Field Settings First Code Mode No. Setting Contents FXFSQ-AR FXMQ-PB FXMQ-AR FXAQ-P Filter cleaning sign interval     Filter type     Remote controller thermistor     Filter cleaning sign ...

  • Page 103: Details Of Field Settings For Indoor Unit

    SiAF332111E Field Settings for Indoor Unit Details of Field Settings for Indoor Unit 1.4.1 Filter Cleaning Sign Interval, Filter Type When the setting 10 (20)-3 is set to 01 (Displayed), filter cleaning sign is displayed on the remote controller after a certain period of operation time. This setting is used to change the display interval of filter cleaning sign when the filter contamination is heavy.
  • Page 104 Field Settings for Indoor Unit SiAF332111E When the unit is equipped with an infrared presence/floor sensor: : Factory setting Mode No. Second Code No. First Code No. 10 (20) 11 (21) The thermistor to be used Remote controller thermistor — —...
  • Page 105 SiAF332111E Field Settings for Indoor Unit 1.4.5 Time for Absence Area Detection By selecting the energy-saving operation mode in the absence, the target temperature is shifted to the energy-saving end by 1°C (maximum 2°C) after the state of absence continues for a certain period of time.
  • Page 106 Field Settings for Indoor Unit SiAF332111E 1.4.8 Setting the Rate of Human Detection Set the sensitivity of the infrared presence/floor sensor.  The infrared presence/floor sensor can be disabled by selecting the Second code No. 04. When the infrared presence/floor sensor is disabled, the remote controller menu does not display some functions such as the automatic draft reduction, energy-saving operation in absence and halt in absence.
  • Page 107 SiAF332111E Field Settings for Indoor Unit 1.4.10 Compensating the Temperature around People Change the ratio between the suction air temperature and floor temperature used to calculate the temperature around people. The temperature around people is calculated using the values of the suction air thermistor and the infrared floor sensor.
  • Page 108 Field Settings for Indoor Unit SiAF332111E 1.4.13 Thermostat Differential Changeover Set when remote sensor is to be used. Differential value during thermostat ON/OFF control can be changed. : Factory setting Mode First Code Second Contents Code No. 01 1ºC 12 (22) 0.5ºC 1.4.14 Auto Restart after Power Failure : Factory setting...
  • Page 109 SiAF332111E Field Settings for Indoor Unit Operation Environment Problem Setting Value Mode - The unit is installed close to a wall or a window. Insufficient +2°C or +4°C - High thermal capacity of the floor (such as concrete, cooling etc.). Cooling - There are many heat sources including PC.
  • Page 110 Field Settings for Indoor Unit SiAF332111E 1.4.18 Airflow Direction Setting Set the airflow direction of indoor units as given in the table below. (Set when sealing material kit of air discharge outlet has been installed.) The second code No. is factory set to 01. : Factory setting Mode First...
  • Page 111 SiAF332111E Field Settings for Indoor Unit 1.4.21 External Static Pressure Settings Make external static pressure setting automatically using automatic airflow adjustment (11 (21)-7), or manually using external static pressure settings (13 (23)-6).  FXMQ-PB : Factory setting Mode No. First Code No. Second Code No.
  • Page 112 Field Settings for Indoor Unit SiAF332111E 1.4.24 Circulation Airflow Patterns This setting is to change the appearance pattern of the circulation airflow direction depending on the installation environment of the indoor unit. Cooling : Factory setting Movement pattern 01: Pattern 1 120...
  • Page 113 SiAF332111E Field Settings for Indoor Unit 1.4.28 Individual Ventilation Setting This is set to perform individual operation of heat reclaim ventilation using the remote controller/central unit when heat reclaim ventilation is built in. (Switch only when heat reclaim ventilation is built in.) : Factory setting Mode First...

  • Page 114: Operation Control Mode

    Field Settings for Indoor Unit SiAF332111E Operation Control Mode The operation control mode is compatible with a variety of controls and operations by limiting the functions of the operation remote controller. Furthermore, operations such as remote controller ON/OFF can be limited in accordance with the combination conditions. (Refer to information on the next page.) Central remote controller is normally available for operations.
  • Page 115 SiAF332111E Field Settings for Indoor Unit How to Select Operation Mode Whether operation by remote controller will be possible or not for turning ON/OFF, controlling temperature or setting operation mode is selected and decided by the operation mode given on the right edge of the table below.

  • Page 116: Field Settings For Outdoor Unit (4/5 Hp Models)

    Field Settings for Outdoor Unit (4/5 HP Models) SiAF332111E 2. Field Settings for Outdoor Unit (4/5 HP Models) Capacity Setting Caution Be sure to carry out capacity setting after changing the main PCB (A1P) to spare PCB. Attach the capacity setting adaptor corresponding to capacity to connector X51A. X51A ...

  • Page 117: Setting Mode And Monitor Mode

    SiAF332111E Field Settings for Outdoor Unit (4/5 HP Models) Setting Mode and Monitor Mode The following 3 modes can be changed over with the button switches on the PCB and you can find the present mode by the status of the H1P indicator. H1P H3P H5P H7P H2P H4P H6P MODE...
  • Page 118 Field Settings for Outdoor Unit (4/5 HP Models) SiAF332111E 2.2.1 Setting Mode 1 This mode is used to set and check the following items. 1. Set items Set COOL/HEAT selection as factory setting. Caution The COOL/HEAT selection function is not available. Do not conduct any modifications on the default factory setting.
  • Page 119 SiAF332111E Field Settings for Outdoor Unit (4/5 HP Models) 2.2.2 Setting Mode 2 e t i Press the MODE (BS1) button for 5 seconds and enter the setting mode Cool / heat unified COOL/HEAT selection function is not available. address Keep the default factory setting.
  • Page 120 Field Settings for Outdoor Unit (4/5 HP Models) SiAF332111E Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory setting k h h h h h h ∗ Address k h h h h h k Binary number Cool / heat unified address...
  • Page 121 SiAF332111E Field Settings for Outdoor Unit (4/5 HP Models) 2.2.3 Monitor Mode LED display Setting item Data display Press the MODE (BS1) button and enter the monitor mode. l h h h h h h See the note Various setting below.
  • Page 122 Field Settings for Outdoor Unit (4/5 HP Models) SiAF332111E Press the SET (BS2) button and match with the LEDs No. 1 - 15, push the RETURN (BS3) button, and confirm the data for each setting.  Data such as addresses and number of units is expressed as binary numbers; the two ways of expressing are as follows: The No.

  • Page 123: Night-Time Low Noise Operation And Demand Operation

    SiAF332111E Field Settings for Outdoor Unit (4/5 HP Models) Night-Time Low Noise Operation and Demand Operation 2.3.1 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 by 2-3 dB. When night-time low noise operation is carried out automatically (External control adaptor for outdoor unit is not required) 1.
  • Page 124 Field Settings for Outdoor Unit (4/5 HP Models) SiAF332111E 2.3.2 Demand Operation By connecting the external contact input to the demand input of the external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition.
  • Page 125 SiAF332111E Field Settings for Outdoor Unit (4/5 HP Models) 2.3.3 Setting Procedure of Night-Time Low Noise Operation and Demand Control 1. Setting mode 1 (H1P OFF) In setting mode 2, push the MODE (BS1) button one time.  The system enters setting mode 1 and the H1P goes OFF.

  • Page 126: Setting Of Refrigerant Additional Charging Operation

    Field Settings for Outdoor Unit (4/5 HP Models) SiAF332111E Setting of Refrigerant Additional Charging Operation When the outdoor unit is stopped and the entire amount of refrigerant cannot be charged from the stop valve on the liquid side, make sure to charge the remaining amount of refrigerant using this procedure.

  • Page 127: Setting Of Vacuuming Mode

    SiAF332111E Field Settings for Outdoor Unit (4/5 HP Models) Setting of Vacuuming Mode In order to perform vacuuming operation on site, fully open the electronic expansion valves of indoor and outdoor units and turn on some solenoid valves. Operating procedure 1.

  • Page 128: Field Settings For Outdoor Unit (6/8 Hp Models)

    Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E 3. Field Settings for Outdoor Unit (6/8 HP Models) This section shows a list of field setting items possible to set at time of initial startup. For details of DIP switch setting, setting mode ("mode 2") and monitor mode ("mode 1"), refer to information on the following pages.

  • Page 129: Settings By Dip Switches

    SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) Settings by DIP Switches 3.2.1 DIP Switch Setting when Mounting a Spare PCB Caution:  After replacement with spare PCB, be sure to make settings shown in the table below. The procedure for making settings of spare PCB is different from that used for factory settings described above.
  • Page 130 Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E RXMQ8AR (3) BS button (BS1~BS3) (2) Segment display (SEG1~SEG3) DIP switch (DS1-1~4) (DS2-1~4) Initial position of DIP switches („) 1 2 3 4 1 2 3 4 Microcomputer normal monitor (HAP) Connection terminal for transmission use (1) Microcomputer normal monitor...
  • Page 131 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) C: 3P473957 Part 5 Field Settings and Test Operation...

  • Page 132: Settings By Bs Buttons

    Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E Settings by BS Buttons The following settings can be made using the BS buttons on the PCB. BS buttons 7 segment display (SEG1-3) SEG1 SEG2 SEG3 MODE RETURN Normal mode (TEST) (RESET) Setting mode Used to make...
  • Page 133 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models)  Selection between normal mode, monitor mode (Mode 1) and setting mode (Mode 2). SEG1 SEG2 SEG3 Normal mode MODE (BS1) button for more than 5 sec. Press MODE (BS1) button once. Press (Initial condition) Monitor mode (Mode 1)

  • Page 134: Normal Mode

    Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E Normal Mode 1. Indoor/outdoor transmission status: Used to check for the initial status of indoor/outdoor transmission. SEG1 SEG2 SEG3 Blinking Initializing Initializing completed 2. Descriptions: Used to display an error content. SEG1 SEG2 SEG3 Normal Example: E7-01...

  • Page 135: Monitor Mode (Mode 1)

    SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) Monitor Mode (Mode 1) In the monitor mode, information can be retrieved about settings related to performance, addresses, number of units and actual operation data. 3.5.1 Retrieve data by using BS button on outdoor unit main PCB SEG1 SEG2 SEG3 Normal To enter monitor mode, press the...
  • Page 136 Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E 3.5.2 Overview of Monitor Mode (Mode 1) Item Contents Display Display 1 Description Description Low noise operation state In normal operation display In low noise operation Demand operation state In normal operation display In demand operation Automatic backup...
  • Page 137 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) Item Contents Display Display 1 Description Description Description of retry Refer to information in Error Code via (latest) Outdoor Unit PCB on page 185. Description of retry (1 cycle before) Description of retry (2 cycles before) Number of outdoor units Possible 0-63...

  • Page 138: Setting Mode (Mode 2)

    Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E Setting Mode (Mode 2) 3.6.1 How to Make Settings SEG1 SEG2 SEG3 Press and hold the MODE (BS1) button for 5 seconds or more to enter setting mode. Normal MODE Selection of setting items Press the SET (BS2) button to select any of the setting item listed in the following table.
  • Page 139 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) 3.6.2 Overview of Setting Mode (Mode 2) This overview shows the available settings by using the press buttons on the outdoor unit PCB. Item Contents Display Display Description Description Low noise/ Used to make address setting for low Address: demand address...
  • Page 140 Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E Item Contents Display Display Description Description Capacity priority Cancel the low noise level control if capacity is required while low noise operation or night-time low noise operation is in progress. Demand 1 Used to make a change to the targeted Level 1 (60%) setting...
  • Page 141 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) 3.6.3 Details of Setting Mode (Mode 2)  Mode 2-2: Low noise/demand address: address for low noise/demand operation.  1 or more systems (maximum 10 systems wired by “F1F2 OUT/D”) can operate use the LNO (Low Noise Operation) or/and the DE (Demand Control) by instruction of field supplied input to optional board DTA104A61/62.
  • Page 142 Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E  Mode 2-12: Enable input “DTA104A61/62”: enable the low noise function and/or power consumption limitation. If the system needs to be running under low noise operation or under power consumption limitation conditions when an external signal is sent to the unit, this setting should be changed.
  • Page 143 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models)  Mode 2-25: Night-time low noise operation level when using external input to optional board DTA104A61/62.  If the system needs to be running under low noise operation conditions when an external signal is sent to the unit, this setting defines the level of low noise that will be applied.
  • Page 144 Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E  Wait until the LEDs are OFF before returning fasten terminals back to the compressor terminals.  Minimum requirements to refer to the result on the inverter checker module:  Line (for RXMQ6AR) or all 3 phases (for RXMQ8AR) and neutral are available, and ...
  • Page 145 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) RXMQ8AR Disconnect U/V/W from compressor before performing the power transistor check. Step 2: Voltage Mode 2-28 Check 2 output Step 1: Set 02 01, then U/V/W Mode 2-28 Frequency: 10 Hz press “Return” twice Set 01 02, then OR press “MODE”...
  • Page 146 Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E  Mode 2-30: Power consumption limitation level 1. If the system needs to be running under power consumption limitation conditions via the external control adaptor for outdoor unit DTA104A61/62. This setting defines the level power consumption limitation that will be applied for level 1.
  • Page 147 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models)  2: Quick. Undershoot during cooling operation is allowed compared to the requested refrigerant temperature, in order to achieve the required room temperature very fast. The overshoot is allowed from the start up moment. In case of cooling operation the evaporating temperature is allowed to go down to 6°C on temporary base depending on the situation.
  • Page 148 Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E  Field setting 1: Possible to operate system when some indoor units are temporary without power supply. The following conditions must be fulfilled:  Maximum equivalent piping length of the farthest indoor less than 120 m. ...

  • Page 149: Eco Mode Setting

    SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) Eco Mode Setting By connecting an external contact input in the input of mode configuration and external control adaptor (sold separately), you may control Eco mode setting, limiting compressor operation load and power consumption. When Eco mode is set as unavailable (Outdoor unit external control adaptor is unnecessary) Eco mode control is unavailable during cooling operation.

  • Page 150: Night-Time Low Noise Operation And Demand Operation

    Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E Night-Time Low Noise Operation and Demand Operation 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 by 2-3 dB. Setting Content Level 1...
  • Page 151 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) 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.
  • Page 152 Field Settings for Outdoor Unit (6/8 HP Models) SiAF332111E Setting of Demand Operation By connecting the external contact input to the demand input of the external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition.
  • Page 153 SiAF332111E Field Settings for Outdoor Unit (6/8 HP Models) Image of operation in the case of A Power consumption Rated The power Demand level 1 Demand level 2 Demand level 3 consumption instructing instructing instructing during the demand level 1 instructing can be set with the Power consumption set by...

  • Page 154: Field Settings For Outdoor Unit (10/12 Hp Models)

    Field Settings for Outdoor Unit (10/12 HP Models) SiAF332111E 4. Field Settings for Outdoor Unit (10/12 HP Models) This chapter will describe how manual input is possible by operating the BS buttons or DIP switches on the logic board and reading the feedback from the 7 segment displays. It is alternatively possible to make several commissioning field setting through a personal computer interface (for this, option EKPCCAB1 is required).

  • Page 155: Bs Buttons And Dip Switches

    SiAF332111E Field Settings for Outdoor Unit (10/12 HP Models) BS Buttons and DIP Switches 1. How to operate  Turn OFF the power supply before operating the DIP switches.  When the power supply is ON, follow the instructions shown in the diagrams below; use a plastic ball-point pen or an insulated object to operate the button switches.
  • Page 156 Field Settings for Outdoor Unit (10/12 HP Models) SiAF332111E In Setting mode and Confirmation mode operate according to Seven-segment display Settings the following sequences. SEG1 SEG2 SEG3 Setting (1) Press the SET button (BS2) to set the (A) For selecting cooling/heating sequences seven-segment display to any of the setting mode (1)
  • Page 157 SiAF332111E Field Settings for Outdoor Unit (10/12 HP Models) Confirmation operation Be sure to open the stop valves on the gas side/liquid side before starting operation. • Be sure to carry out confirmation operation upon initial installation. If confirmation operation is not carried out, the remote controller and the seven-segment display will display the error code U3, so that the unit cannot operate normally.
  • Page 158 Field Settings for Outdoor Unit (10/12 HP Models) SiAF332111E Operating the BS buttons By operating the BS buttons it is possible to:  Perform special actions (test run, etc).  Perform field settings (demand operation, low noise, etc). Below procedure explains how to operate the BS buttons to reach the required mode in the menu, select the correct setting and modify the value of the setting.
  • Page 159 SiAF332111E Field Settings for Outdoor Unit (10/12 HP Models) Accessing modes BS1 is used to change the mode you want to access.  Access mode 1 Press BS1 once. Segment indication changes to:  Access mode 2 Press BS1 for at least 5 seconds. Segment indication changes to: Note(s) INFORMATION: If you get confused in the middle of the process, press BS1.
  • Page 160 Field Settings for Outdoor Unit (10/12 HP Models) SiAF332111E 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 BS1 for more than 5 seconds), you can select the wanted setting.
  • Page 161 SiAF332111E Field Settings for Outdoor Unit (10/12 HP Models) 4.2.1 Connecting of the Optional PC Configurator Cable to the Outdoor Unit Connecting the PC configurator to the outdoor unit has to be done on A1P. Connect the EKPCCAB 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 162 Field Settings for Outdoor Unit (10/12 HP Models) SiAF332111E 4.2.2 Mode 1 Mode 1 can be used to monitor the current situation of the outdoor unit. Some field setting contents can be monitored as well. Below the settings in mode 1 are explained. [1-0]: shows whether the unit you check is a master, slave 1 or slave 2 unit.
  • Page 163 SiAF332111E Field Settings for Outdoor Unit (10/12 HP Models) [1-13]: shows the total number of connected outdoor units (in case of multiple outdoor system). It can be convenient to check if the total number of outdoor units which are installed matches the total number of outdoor units which are recognized by the system.
  • Page 164 Field Settings for Outdoor Unit (10/12 HP Models) SiAF332111E [2-20]: Manual additional refrigerant charge In order to add the additional refrigerant charge amount in a manual way (without automatic refrigerant charging functionality), following setting should be applied. Default value: 0 To activate this function: 1 To stop the manual additional refrigerant charge operation (when the required additional refrigerant amount is charged), press BS3.
  • Page 165 SiAF332111E Field Settings for Outdoor Unit (10/12 HP Models) [2-30]: Power consumption limitation level (step 1) via the external control adaptor (DTA104A61/62) If the system needs to be running under power consumption limitation conditions when an external signal is sent to the unit, this setting defines the level power consumption limitation that will be applied for step 1.
  • Page 166 Field Settings for Outdoor Unit (10/12 HP Models) SiAF332111E [2-49]: Max. level difference setting In case the outdoor location is higher than indoor, extension is possible up till 90 m. Refer to [2-49] for dedicated setting. Value Max. level difference setting [2-49] 0...

  • Page 167: Test Operation (4/5/10/12 Hp Models)

    SiAF332111E Test Operation (4/5/10/12 HP Models) 5. Test Operation (4/5/10/12 HP Models) Follow the following procedure to conduct the initial test operation after installation. Check Work Prior to Turning Power Supply ON • Is the power supply appropriate? Check the below items. •...

  • Page 168: Test Operation (4/5 Hp Models)

    Test Operation (4/5/10/12 HP Models) SiAF332111E Test Operation (4/5 HP Models) To start smoothly, a crankcase heater is equipped to the 5 HP unit only & to power up the crankcase heater in advance, be sure to turn on the power supply 6 hours before operation. Crankcase heater is not provided for 4 HP unit.
  • Page 169 SiAF332111E Test Operation (4/5/10/12 HP Models) Caution Power supply has been turned on for outdoor unit, be careful to avoid electric shock.  Set the BS buttons (BS1~5) after making sure the service monitoring lamp has been  For setting method, see the Service Precautions label attached to the front panel of the outdoor unit.
  • Page 170 Test Operation (4/5/10/12 HP Models) SiAF332111E For Normal Operation Set the master unit (the indoor unit) For wired remote controller  After test operation is completed, symbol MASTER CONTROLLED blinks on all connected remote controllers.  Set the master unit as customer's request. (It is recommended to set the indoor unit with highest frequency of use as the master unit.) ...
  • Page 171 SiAF332111E Test Operation (4/5/10/12 HP Models) 5.3.1 Error Codes and Corresponding Measures Please check the remote controller connected with the indoor unit. Error code Description Solution The outdoor unit stop valve is left closed Open the gas side and liquid side stop valves. The refrigerant is overcharged Recalculate the piping length and refrigerant charge, and recover the excessive refrigerant with...

  • Page 172: Test Operation (10/12 Hp Models)

    Test Operation (4/5/10/12 HP Models) SiAF332111E Test Operation (10/12 HP Models) To start smoothly, a crankcase heater is equipped to the unit. To power up the crankcase heater in advance, be sure to turn on the power supply 6 hours before operation. Warning Be sure to inform other installers or attach the front panel well before leaving with the power supply turned on for the outdoor unit.
  • Page 173 SiAF332111E Test Operation (4/5/10/12 HP Models) with the BS buttons (BS1~3) on outdoor unit PCB (A1P). (See the Service Precautions label for details) Caution Power supply has been turned ON for outdoor unit, be careful to avoid electric shock.  Set the BS buttons (BS1~3) after making sure the microcomputer normal monitoring lamp has been ON.
  • Page 174 Test Operation (4/5/10/12 HP Models) SiAF332111E (4) Press the fan direction and strength buttons of the indoor unit to see if they operate properly. About normal operation check  The compressor will not restart in about 5 minutes even if the ON/OFF button of the remote controller is pressed.
  • Page 175 SiAF332111E Test Operation (4/5/10/12 HP Models) Error code Description Solution Primary Sub code code Transmission between outdoor unit main PCB and Check the connection. inverter PCB Transmission between outdoor unit main PCB and Check the connection. fan PCB 1 Transmission between outdoor unit main PCB and Check the connection.

  • Page 176: Test Operation (6/8 Hp)

    Test Operation (6/8 HP) SiAF332111E 6. Test Operation (6/8 HP) 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: 220-240 V ± 10% for 1-phase units; 380-415 V ±...

  • Page 177: Test Operation Procedure

    SiAF332111E Test Operation (6/8 HP) Test Operation Procedure To start smoothly, a crankcase heater is equipped to the unit. To power up the crankcase heater in advance, be sure to turn on the power supply 6 hours before operation. Warning Be sure to inform other installers or attach the front panel well before leaving with the power supply turned on for the outdoor unit.
  • Page 178 Test Operation (6/8 HP) SiAF332111E About test operation  In order to ensure uniform refrigerant distribution, it may take up to around 10 minutes for the compressor to start up after the unit starting operation. This is not an error. ...

  • Page 179: Turn Power On

    SiAF332111E Test Operation (6/8 HP) Turn Power ON • Be sure to turn the power ON 6 hours before starting operation to protect Turn outdoor unit and indoor compressors. unit power ON. • Check to be sure the transmission is normal. Check the 7 segment display of In a normal condition, the 7-segment display is OFF.
  • Page 180 SiAF332111E Part 6 Service Diagnosis 1. Servicing Items to be Confirmed ............177 1.1 Troubleshooting..................177 1.2 Precautions for Maintenance..............177 1.3 Refrigerant Properties (R-410A)............178 2. Symptom-based Troubleshooting ............179 2.1 With Optional Infrared Presence/Floor Sensor........181 2.2 For 6/8 HP Outdoor Units..............182 3. Error Code via Remote Controller............183 3.1 BRC1E63 .....................183 3.2 BRC4M Series..................184 4.
  • Page 181 SiAF332111E 5.28 Compressor Damage Alarm..............239 5.29 Outdoor Fan Motor Abnormality ............241 5.30 Electronic Expansion Valve Coil Abnormality........248 5.31 Discharge Pipe Temperature Abnormality ...........249 5.32 Wet Alarm.....................253 5.33 Refrigerant Overcharged..............255 5.34 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB)..................256 5.35 OL Activation (Compressor Overload) ..........257 5.36 Outdoor Fan Motor Signal Abnormality ..........259 5.37 Outdoor Fan PCB Abnormality.............260...
  • Page 182 SiAF332111E 6. Check ....................337 6.1 High Pressure Check ................337 6.2 Low Pressure Check ................338 6.3 Superheat Operation Check..............339 6.4 Power Transistor Check ...............340 6.5 Wet Operation Check ................344 6.6 Refrigerant Overcharge Check.............345 6.7 Refrigerant Shortage Check..............346 6.8 Vacuuming and Dehydration Procedure ..........347 6.9 Inverter-Related Error Codes ...............348 6.10 Concept of Inverter-Related Error Codes..........349 6.11 Thermistor Check .................350...

  • Page 183: Servicing Items To Be Confirmed

    SiAF332111E Servicing Items to be Confirmed 1. Servicing Items to be Confirmed Troubleshooting 1. Initial verification and troubleshooting (1) Properly understand the end user's needs and issues. (2) Check the cause of errors according to the description provided by the end user. (3) Check if the remote controller displays any error codes.

  • Page 184: Refrigerant Properties (R-410A)

    Servicing Items to be Confirmed SiAF332111E PCB may sometimes display an error code. If any error codes are displayed, press the RETURN (BS3) button. If performing the above operation still does not eliminate the error, reconnect the unit to the power supply. Refrigerant Properties (R-410A) 4.00 3.90...

  • Page 185: Symptom-Based Troubleshooting

    SiAF332111E Symptom-based Troubleshooting 2. Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure The system does not start operation at all. Blowout of fuse(s) Turn Off the power supply and then replace the fuse(s). Cutout of breaker(s) • If the knob of any breaker is in its OFF position, turn ON the power supply.
  • Page 186 Symptom-based Troubleshooting SiAF332111E Symptom Supposed Cause Countermeasure The airflow The airflow direction is not Automatic control Normal operation. direction is not corresponding to that reproduced displayed on the remote according to the controller. setting. The flap does not swing. A white mist Indoor unit Uneven temperature distribution Clean the inside of the indoor unit.

  • Page 187: With Optional Infrared Presence/Floor Sensor

    SiAF332111E Symptom-based Troubleshooting With Optional Infrared Presence/Floor Sensor Problem Measure 1 Louver operation different from setting Refer to the flowchart below. Individual airflow direction setting different from the actual Check the "Louver operation different from setting" error airflow direction diagnosis. 3 While not operating, the louver does not close completely.

  • Page 188: For 6/8 Hp Outdoor Units

    Symptom-based Troubleshooting SiAF332111E For 6/8 HP Outdoor Units Problem Measure Decrease of main circuit power supply insulation Define the measure using the flowchart below. resistance (Less than 1 M) Decrease of main circuit power supply insulation resistance Cut the power supply. Remove the compressor wiring from the power supply terminal.

  • Page 189: Error Code Via Remote Controller

    SiAF332111E Error Code via Remote Controller 3. Error Code via Remote Controller BRC1E63 The following message is 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 Menu/Enter button...

  • Page 190: Brc4M Series

    Error Code via Remote Controller SiAF332111E BRC4M Series When the air conditioner stops in emergency, the operating indicator lamp on the indoor unit starts blinking. Take the following steps yourself to read the error code that appears on the display. Contact your local dealer with this code.

  • Page 191: Error Code Via Outdoor Unit Pcb

    SiAF332111E Error Code via Outdoor Unit PCB 4. Error Code via Outdoor Unit PCB 4/5 HP Models Monitor mode To enter the monitor mode, press Contents of Error Error Code the MODE (BS1) button when in y t i “Setting mode 1”. Abnormal high pressure switch High pressure switch activated Abnormal low pressure switch...
  • Page 192 Error Code via Outdoor Unit PCB SiAF332111E k: ON h: OFF l: Blink Confirmation of Error 1 Confirmation of Error 2 Confirmation of Error 3 Confirmation of Error 4 Error Code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P ∗1 ∗1 ∗1...
  • Page 193 SiAF332111E Error Code via Outdoor Unit PCB Monitor mode Error Description Error Code To enter the monitor mode, press the MODE (BS1) button when in Inverter circuit capacitor high voltage Imbalance of inverter power supply “Setting mode 1”. voltage Radiation fin thermistor abnormality Defective thermistor of inverter fin Poor inverter and fan drive combination Refrigerant shortage...
  • Page 194 Error Code via Outdoor Unit PCB SiAF332111E k: ON h: OFF l: Blink Confirmation of Error 1 Confirmation of Error 2 Confirmation of Error 3 Confirmation of Error 4 Error Code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P ∗1 ∗1 Display of error...

  • Page 195: Hp Models

    SiAF332111E Error Code via Outdoor Unit PCB 6-12 HP Models Error code descriptions are accessible on monitor mode (Mode 1). Refer to page 129 for monitor mode. The error codes for forced stop outdoor or retry are item:  17, 18, 19: description of error (outdoor system stopped operation). ...

  • Page 196: Troubleshooting By Error Code

    Troubleshooting by Error Code SiAF332111E 5. Troubleshooting by Error Code Error Codes and Descriptions k: ON h: OFF l: Blink Operation Reference Error code Description lamp page Indoor Unit External protection device abnormality Indoor unit PCB abnormality Drain level control system abnormality Indoor fan motor lock, overload Indoor fan motor abnormality Power supply voltage abnormality...
  • Page 197 SiAF332111E Troubleshooting by Error Code Operation Reference Error code Description lamp page Outdoor Unit Outdoor unit main PCB abnormality Current leakage detection Missing of leakage detection core Activation of high pressure switch Activation of low pressure sensor Compressor motor lock Compressor damage alarm Outdoor fan motor abnormality Electronic expansion valve coil abnormality...
  • Page 198 Troubleshooting by Error Code SiAF332111E Operation Reference Error code Description lamp page System U0 Refrigerant shortage Open phase Reverse phase, open phase Power supply insufficient or instantaneous abnormality Check operation not executed Transmission error between indoor units and outdoor units Transmission error between remote controller and indoor unit Transmission error between main and sub remote controllers Other indoor units and outdoor unit abnormality...

  • Page 199: Error Codes (Sub Codes)

    SiAF332111E 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 referring to the attached list of detailed error codes.
  • Page 200 Troubleshooting by Error Code SiAF332111E 5.2.2 Outdoor Unit, System Troubleshooting Error code Description of error Diagnosis E1 - 01 Outdoor unit PCB error Refer to the E1 flowchart and make a diagnosis based on the Error code shown to the left. E1 - 02 Defective outdoor unit PCB E2 - 01...
  • Page 201 SiAF332111E Troubleshooting by Error Code Troubleshooting Error code Description of error Diagnosis Defective subcooling heat exchanger liquid pipe Refer to the J7 flowchart and make a diagnosis J7 - 06 thermistor (R5T: 6/8/10/12 HP) of the thermistor based on the Error code shown to the left. Defective heat exchanger liquid pipe thermistor Refer to the J8 flowchart and make a diagnosis J8 - 01...
  • Page 202 Troubleshooting by Error Code SiAF332111E Troubleshooting Error code Description of error Diagnosis U2 - 01 Shortage of inverter power supply voltage Refer to the U2 flowchart and make a diagnosis based on the Error code shown to the left. U2 - 02 Power phase loss Initial installation alarm, Test operation failed due to U3 - 02...

  • Page 203: External Protection Device Abnormality

    SiAF332111E Troubleshooting by Error Code External Protection Device Abnormality Applicable All indoor unit models Models Error Code Method of Error Detects open or short circuit between external input terminals in indoor unit. Detection Error Decision An open circuit occurs between external input terminals with the remote controller set for Conditions external ON/OFF input.

  • Page 204: Indoor Unit Pcb Abnormality

    Troubleshooting by Error Code SiAF332111E Indoor Unit PCB Abnormality Applicable All indoor unit models Models Error Code Method of Error Data from EEPROM is checked. Detection Error Decision Data cannot be correctly received from the EEPROM Conditions EEPROM: Type of nonvolatile memory. Maintains memory contents even when the power supply is turned OFF.

  • Page 205: Drain Level Control System Abnormality

    SiAF332111E Troubleshooting by Error Code Drain Level Control System Abnormality Applicable FXFSQ-AR, FXMQ-PB Models Error Code Method of Error By float switch OFF detection Detection Error Decision Float switch goes OFF when the conditions for water level rise are not met Conditions Supposed ...
  • Page 206 Troubleshooting by Error Code SiAF332111E The drain pump works when the Check the drain piping for power supply is reset for the clogging or upward slope, etc. indoor unit. voltage of drain pump terminals (∗2) is in accordance to the criteria Replace the indoor unit control (∗3) (within 5 minutes of PCB (A1P).

  • Page 207: Indoor Fan Motor Lock, Overload

    SiAF332111E Troubleshooting by Error Code Indoor Fan Motor Lock, Overload Applicable FXMQ40PB, FXAQ-P Models Error Code Method of Error Abnormal fan revolutions are detected by a signal output from the fan motor. Detection Error Decision The fan revolutions do not increase. Conditions Supposed ...
  • Page 208 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply, and then wait for a period of 10 minutes. Are there any foreign matter Remove the foreign matter.

  • Page 209: Indoor Fan Motor Abnormality

    SiAF332111E Troubleshooting by Error Code Indoor Fan Motor Abnormality 5.7.1 Indoor Fan Motor Abnormality (FXMQ50-140PB) Applicable FXMQ50-140PB Models Error Code Method of Error  Error from the current flow on the fan PCB  Error from the rotation speed of the fan motor in operation Detection ...
  • Page 210 Troubleshooting by Error Code SiAF332111E 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 the Remove the foreign matter.
  • Page 211 SiAF332111E Troubleshooting by Error Code The resistance among U, V, and W are unbalanced Replace the indoor fan motor (M1F). or below 1 Ω. CHECK 17 Remove the signal connector from the fan motor and check the resistance. Between and GND terminals, and between GND Replace the indoor fan and H...
  • Page 212 Troubleshooting by Error Code SiAF332111E 5.7.2 Indoor Fan Motor Abnormality (FXFSQ-AR) Applicable FXFSQ-AR Models A6-10 Error Code Method of Error  Detection from the current flow on the fan PCB (A1P) Detection  Detection from the rotation speed of the fan motor in operation ...
  • Page 213 SiAF332111E Troubleshooting by Error Code The HAP lamp on the indoor unit Replace the indoor unit control control PCB is PCB (A1P). blinking. Replace the fan motor (M1F). 1 Check also if the relay connector between the indoor unit control PCB and the fan motor are correctly connected.

  • Page 214: Power Supply Voltage Abnormality

    Troubleshooting by Error Code SiAF332111E Power Supply Voltage Abnormality 5.8.1 Power Supply Voltage Abnormality (FXMQ-PB) Applicable FXMQ-PB Models Error Code Method of Error Error is detected by checking the input voltage of the fan motor. Detection Error Decision When the input voltage of fan motor is 150 V or less, or 386 V or more. Conditions Supposed ...
  • Page 215 SiAF332111E Troubleshooting by Error Code 5.8.2 Power Supply Voltage Abnormality (FXFSQ-AR) Applicable FXFSQ-AR Models A8-01 Error Code Method of Error This error is detected by checking the voltage status with the microcomputer. Detection Error Decision Overvoltage or voltage drop is detected on the fan driver. Conditions Supposed ...
  • Page 216 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the condition of the power supply. Check if power supply voltage is 220-240 V±10%. There are problems Correct any fault.

  • Page 217: Electronic Expansion Valve Coil Abnormality, Dust Clogging

    SiAF332111E Troubleshooting by Error Code Electronic Expansion Valve Coil Abnormality, Dust Clogging Applicable All indoor unit models Models A9, A9-02 Error Code Method of Error Electronic expansion valve coil conditions are checked via microcomputer. Detection The electronic expansion valve main body is checked for dust clogging via microcomputer. Error Decision Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.

  • Page 218: Humidifier System Abnormality

    Troubleshooting by Error Code SiAF332111E 5.10 Humidifier System Abnormality Applicable FXFSQ-AR, FXMQ-PB Models Error Code Method of Error Water leakage from the humidifier system is detected based on float switch ON/OFF operation Detection while the compressor is not in operation. Error Decision The float switch changes from ON to OFF while the compressor is not in operation.

  • Page 219: Auto Grille Unit Error

    SiAF332111E Troubleshooting by Error Code 5.11 Auto Grille Unit Error Applicable FXFSQ-AR (when auto grille panel BYCQ125EBSF is installed) Models AH-12 Error Code Method of Error This error is determined when an abnormal signal from the auto grille kit is detected. Detection Error Decision Any of the following conditions is established while the grille is elevating.

  • Page 220: Defective Capacity Setting

    Troubleshooting by Error Code SiAF332111E 5.12 Defective Capacity Setting Applicable All indoor unit models Models Error Code Method of Error Capacity is determined according to resistance of the capacity setting adaptor and the memory Detection inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is determined.

  • Page 221: Transmission Abnormality (Between Indoor Unit Pcb And Fan Pcb)

    SiAF332111E Troubleshooting by Error Code 5.13 Transmission Abnormality (between Indoor Unit PCB and Fan PCB) Applicable FXMQ-PB Models Error Code Method of Error Transmission conditions between the indoor unit control PCB (A1P) and fan PCB (A2P) are Detection checked via microcomputer. Error Decision When normal transmission is not carried out for a certain duration.
  • Page 222 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the connector between indoor unit PCB (A1P) and fan Connect the connector accurately. PCB (A2P) accurately connected? (∗1) Confirm the condition of transmission on indoor unit...

  • Page 223: Transmission Error

    SiAF332111E Troubleshooting by Error Code 5.14 Transmission Error Applicable FXFSQ-AR Models C1-01 Error Code Method of Error Check the condition of transmission using microcomputer. Detection Error Decision Error is decided when transmission has been lost for 15 seconds and the error code is Conditions displayed on the remote controller 60 seconds later.

  • Page 224: Transmission Error (Between Indoor Unit Pcb And Auto Grille Control Pcb)

    Troubleshooting by Error Code SiAF332111E 5.15 Transmission Error (between Indoor Unit PCB and Auto Grille Control PCB) Applicable FXFSQ-AR (when auto grille panel BYCQ125EBSF is installed) Models C1-06 Error Code Method of Error The status of communication between the indoor unit PCB (X70A) and the auto grille control Detection PCB (X12A) is checked with the microcomputer.
  • Page 225 SiAF332111E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the X70A connector on the indoor Properly connect the connector. unit PCB properly connected? Is the X12A connector on the auto grille Properly connect the connector.

  • Page 226: Thermistor Abnormality

    Troubleshooting by Error Code SiAF332111E 5.16 Thermistor Abnormality Applicable All indoor unit models Models C4, C5, C9 Error Code Method of Error The error is determined by the temperature detected by the thermistor. Detection Error Decision The thermistor becomes disconnected or shorted while the unit is running. Conditions Supposed ...

  • Page 227: Combination Abnormality (Between Indoor Unit Pcb And Fan Pcb)

    SiAF332111E Troubleshooting by Error Code 5.17 Combination Abnormality (between Indoor Unit PCB and Fan PCB) Applicable FXMQ-PB Models Error Code Method of Error Transmission conditions with the fan PCB (A2P) are checked using the indoor unit PCB (A1P). Detection Error Decision Fan PCB (A2P) communication data is determined to be incorrect.

  • Page 228: Capacity Setting Abnormality

    Troubleshooting by Error Code SiAF332111E 5.18 Capacity Setting Abnormality Applicable FXFSQ-AR Models C6-01 Error Code Method of Error This error is detected by checking communication between the PCB (A1P) and the fan Detection microcomputer. Error Decision Based on the communication data, decide whether the combination of capacity setting and the Conditions type of fan driver is correct.

  • Page 229: Indoor Unit Pcb Abnormality

    SiAF332111E Troubleshooting by Error Code 5.19 Indoor Unit PCB Abnormality Applicable FXFSQ-AR Models C6-05 Error Code Method of Error This error is detected by checking the current sensor value. Detection Error Decision When an abnormal signal is detected at the start of operation of the fan motor. Conditions Supposed ...

  • Page 230: Infrared Presence/Floor Sensor Error

    Troubleshooting by Error Code SiAF332111E 5.20 Infrared Presence/Floor Sensor Error Applicable FXFSQ-AR Models Error Code Method of Error The contents of a failure vary with the detailed error code. Check the code and proceed with the Detection flowchart. Error Decision Error is detected based on sensor output signals Conditions Supposed...
  • Page 231 SiAF332111E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 1 Infrared presence sensor error (Error code CE-01) Is the connection of the connector on infrared presence Connect the connector correctly. sensor PCB (A3P) and the connector X81A on A1P normal? Is the connection of the Connect the connector correctly.
  • Page 232 Troubleshooting by Error Code SiAF332111E Troubleshooting Diagnosis procedure 2 Infrared floor sensor error (Error code CE-02) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB (A2P) and the connector X81A on A1P normal? Is the connection of the Connect the connector correctly.
  • Page 233 SiAF332111E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 3 Infrared floor sensor error (Error code CE-03) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB (A2P) and the connector X81A on A1P normal? Is the connection of the Connect the connector correctly.
  • Page 234 Troubleshooting by Error Code SiAF332111E Troubleshooting Diagnosis procedure 4 Infrared floor sensor error (Error code CE-04) Is the connection of the connector on infrared floor Connect the connector correctly. sensor PCB (A2P) and the connector X81A on A1P normal? Is the connection of the Connect the connector correctly.

  • Page 235: Remote Controller Thermistor Abnormality

    SiAF332111E Troubleshooting by Error Code 5.21 Remote Controller Thermistor Abnormality Applicable All indoor unit models Models Error Code Method of Error Error detection is carried out by the temperature detected by the remote controller thermistor. Detection Error Decision When the remote controller thermistor becomes disconnected or shorted while the unit is Conditions running.

  • Page 236: Outdoor Unit Main Pcb Abnormality

    Troubleshooting by Error Code SiAF332111E 5.22 Outdoor Unit Main PCB Abnormality Applicable All outdoor unit models Models Error Code Method of Error Abnormality is detected under the communication conditions in the hardware section between Detection the indoor unit and outdoor unit. Error Decision When the communication conditions in the hardware section between the indoor unit and the Conditions...

  • Page 237: Current Leakage Detection

    SiAF332111E Troubleshooting by Error Code 5.23 Current Leakage Detection Applicable RXMQ8-12AR Models Error Code Sub code: 01 Method of Error Current leakage is detected in the earth leakage detection circuit. Error is detected on the Detection outdoor unit main PCB. Error Decision When leakage current is detected.

  • Page 238: Missing Of Leakage Detection Core

    Troubleshooting by Error Code SiAF332111E 5.24 Missing of Leakage Detection Core Applicable RXMQ8-12AR Models Error Code Sub code: 06 Method of Error Detect error according to whether or not there is continuity across the connector (X101A). Detection Error Decision When no current flows at the time of turning ON the power supply. Conditions Supposed ...

  • Page 239: Activation Of High Pressure Switch

    SiAF332111E Troubleshooting by Error Code 5.25 Activation of High Pressure Switch Applicable All outdoor unit models Models Error Code Method of Error Detect continuity across the high pressure switch in the protection device circuit. Detection Error Decision When part of the protection device circuit opens. Conditions (Reference) Operating pressure of the high pressure switch: ...
  • Page 240 Troubleshooting by Error Code SiAF332111E CHECK 12 Service Checker Connect the service checker, and then compare the high pressure value measured by the service checker with the voltage measurement of the connector of the pressure sensor ( 1) Are both pressure values the Replace the outdoor unit same? main PCB (A1P).

  • Page 241: Activation Of Low Pressure Sensor

    SiAF332111E Troubleshooting by Error Code 5.26 Activation of Low Pressure Sensor Applicable All outdoor unit models Models Error Code Method of Error Make judgment of pressure detected by the low pressure sensor with the outdoor unit main Detection PCB. Error Decision When low pressure caused a drop while the compressor is in operation: Conditions ...
  • Page 242 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the stop Open the stop valve. valve open? RXQ4/5AR and RXMQ10/12AR only indoor unit errors? (Other than E4 in the error Eliminate the indoor unit error.

  • Page 243: Compressor Motor Lock

    SiAF332111E Troubleshooting by Error Code 5.27 Compressor Motor Lock Applicable All outdoor unit models Models Error Code Method of Error Outdoor unit PCB takes the position signal from UVW line connected between the inverter and Detection compressor, and the error is detected when any abnormality is observed in the phase-current waveform.
  • Page 244 Troubleshooting by Error Code SiAF332111E The insulation resistance of the Replace the compressor (M1C). compressor is low (< 100 k:) Power OFF internal wiring of the compressor coil is defective. Restart the compressor, and then Quit work. check for the operation. Pressure equalization failure Does the error may have occurred.

  • Page 245: Compressor Damage Alarm

    SiAF332111E Troubleshooting by Error Code 5.28 Compressor Damage Alarm Applicable RXMQ10/12AR Models Error Code Method of Error Error is determined based on the detected compressor revolutions, pressure values of the Detection high/low pressure sensors, and theoretical compressor current value. This theoretical current value is compared to the actual value detected by the power transistor.
  • Page 246 Troubleshooting by Error Code SiAF332111E the high/low pressure measured by the service checker the same as the actual measured Replace the outdoor unit main PCB voltage values of the (A1P). high/low pressure sensors? CHECK 4 Is the power transistor Replace the inverter PCB normal? (A3P).

  • Page 247: Outdoor Fan Motor Abnormality

    SiAF332111E Troubleshooting by Error Code 5.29 Outdoor Fan Motor Abnormality 5.29.1 Outdoor Fan Motor Abnormality (4/5 HP Models) Applicable RXQ4/5AR Models Error Code Method of Error The fan motor circuit error is detected based on the rotation frequency detected by Hall IC during the fan motor operation.
  • Page 248 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the voltage between L1 and N of power terminal strip Calibrate the power voltage. X1M within the power supply If L1 and N phases are voltage ±10%?
  • Page 249 SiAF332111E Troubleshooting by Error Code 5.29.2 Outdoor Fan Motor Abnormality (6/8 HP Models) Applicable RXMQ6/8AR Models Error Code Method of Error  Detect according to the value of current flowing through the PCB. Detection  Detect error of the fan motor system according to the fan revolutions detected by the Hall IC during the fan motor runs.
  • Page 250 Troubleshooting by Error Code SiAF332111E 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 is foreign matter around the Remove the foreign matter.
  • Page 251 SiAF332111E Troubleshooting by Error Code RXMQ6AR CHECK 16 Check for the connector (power supply cable) of the fan motor. Resistance between U, V, W phases of the fan motor power supply cable has lost Replace the fan motor (M1F). balance or short circuit is caused between U, V, W phases.
  • Page 252 Troubleshooting by Error Code SiAF332111E 5.29.3 Outdoor Fan Motor Abnormality (10/12 HP Models) Applicable RXMQ10/12AR Models Error Code Method of Error  Abnormality is detected according to the value of current flowing through the inverter PCB Detection (or fan PCB for fan motor 2). ...
  • Page 253 SiAF332111E Troubleshooting by Error Code There is no conduction across the fuse (F101U) Replace the fan PCB. on the fan PCB. fan can be rotated by hand after disconnecting the Replace the relevant fan motor. connector from the fan motor. Resistance between the fan motor power supply...

  • Page 254: Electronic Expansion Valve Coil Abnormality

    Troubleshooting by Error Code SiAF332111E 5.30 Electronic Expansion Valve Coil Abnormality Applicable RXMQ6-12AR Models Error Code Method of Error Detect according to whether or not there is continuity across the electronic expansion valve Detection coils (Y1E, Y2E, Y4E). Error Decision When no current flows through common (COM+) at the time of turning ON the power supply.

  • Page 255: Discharge Pipe Temperature Abnormality

    SiAF332111E Troubleshooting by Error Code 5.31 Discharge Pipe Temperature Abnormality 5.31.1 Discharge Pipe Temperature Abnormality (4/5 HP Models) Applicable RXQ4/5AR Models Error Code Method of Error Abnormality is detected according to the temperature detected by the discharge pipe thermistor. Detection Error Decision The discharge pipe temperature rises to an abnormally high level.
  • Page 256 Troubleshooting by Error Code SiAF332111E 5.31.2 Discharge Pipe Temperature Abnormality (6/8 HP Models) Applicable RXMQ6/8AR Models Error Code Method of Error Detect according to temperature detected with the discharge pipe or compressor body Detection thermistor. Error Decision  When discharge pipe temperature becomes abnormally high (i.e., 135°C or more) Conditions ...
  • Page 257 SiAF332111E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the stop valve open? Open the stop valve. Connect the Service Checker. Reset the system operation, and then restart it.
  • Page 258 Troubleshooting by Error Code SiAF332111E 5.31.3 Discharge Pipe Temperature Abnormality (10/12 HP Models) Applicable RXMQ10/12AR Models Error Code Method of Error Abnormality is detected according to the temperature detected with the discharge pipe or Detection compressor body thermistor. Error Decision When discharge pipe temperature becomes abnormally high (135°C or more) Conditions When discharge pipe temperature rises sharply (remains at 120°C or more for a continuous...

  • Page 259: Wet Alarm

    SiAF332111E Troubleshooting by Error Code 5.32 Wet Alarm Applicable All outdoor unit models Models Error Code Method of Error In cooling operation, detect the condition under which liquid refrigerant returns to the Detection compressor, according to the temperature and pressure of each part. Error Decision ...
  • Page 260 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the Service Checker. Mount a pressure gauge on the high pressure service port. Reset the operation, and then restart the operation.

  • Page 261: Refrigerant Overcharged

    SiAF332111E Troubleshooting by Error Code 5.33 Refrigerant Overcharged Applicable All outdoor unit models Models Error Code Method of Error Detect overcharged refrigerant according to the following thermistor temperatures during test Detection operation.  4/5 HP models Outdoor air thermistor (R1T) Heat exchanger deicer thermistor (R4T) ...

  • Page 262: Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb)

    Troubleshooting by Error Code SiAF332111E 5.34 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB) Applicable RXMQ8-12AR Models Error Code Method of Error Check for the transmission conditions of the harnesses between the PCBs (X28A (A1P) and Detection X6A (A3P)), and relay connector, if any, using microcomputer. Error Decision When normal transmission between PCBs is disabled during the compressor stops running.

  • Page 263: Ol Activation (Compressor Overload)

    SiAF332111E Troubleshooting by Error Code 5.35 OL Activation (Compressor Overload) Applicable RXMQ6/8AR Models Error Code Method of Error A compressor overload is detected through compressor OL. Detection Error Decision  If the error occurs, the system is shut down. Conditions ...
  • Page 264 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Discharge pipe Insert the thermistor in thermistor disconnected? position. CHECK 11 Check the discharge pipe Replace the discharge pipe thermistor.

  • Page 265: Outdoor Fan Motor Signal Abnormality

    SiAF332111E Troubleshooting by Error Code 5.36 Outdoor Fan Motor Signal Abnormality Applicable RXQ4/5AR Models Error Code Method of Error Detection of abnormal signal from fan motor Detection Error Decision In case of detection of abnormal signal at starting fan motor Conditions Supposed ...

  • Page 266: Outdoor Fan Pcb Abnormality

    Troubleshooting by Error Code SiAF332111E 5.37 Outdoor Fan PCB Abnormality Applicable RXMQ8AR Models H7-21 Error Code Method of Error Detect according to values detected with current sensor. Detection Error Decision When the current sensor is abnormal. Conditions Supposed  Disconnection/Short circuit in fan motor leads or disconnection of connector Causes ...

  • Page 267: Thermistor Abnormality

    SiAF332111E Troubleshooting by Error Code 5.38 Thermistor Abnormality Applicable All outdoor unit models Models H9, J3, J5, J6, J7, J8, J9 Error Code Method of Error Detect according to temperature detected with individual thermistors. Detection Error Decision When the system is in operation and the thermistor causes wiring disconnection or short circuit Conditions in it.
  • Page 268 Troubleshooting by Error Code SiAF332111E Note(s) 1. Error codes and thermistors RXQ4/5AR RXMQ6/8AR RXMQ10/12AR Error Applicable Thermistor Electric Electric Electric Code Connector Connector Connector symbol symbol symbol Outdoor air thermistor X11A X18A X18A Discharge pipe thermistor R21T X19A R21T X29A (Group Compressor body thermistor —...

  • Page 269: High Pressure Sensor Abnormality

    SiAF332111E Troubleshooting by Error Code 5.39 High Pressure Sensor Abnormality Applicable All outdoor unit models Models Error Code 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) Supposed...

  • Page 270: Low Pressure Sensor Abnormality

    Troubleshooting by Error Code SiAF332111E 5.40 Low Pressure Sensor Abnormality Applicable All outdoor unit models Models Error Code Method of Error Detect according to temperature detected with the low pressure sensor. Detection Error Decision The low pressure sensor is short circuit or open circuit. Conditions (Pressure range: 0-1.7 MPa) Supposed...

  • Page 271: Inverter Circuit Abnormality

    SiAF332111E Troubleshooting by Error Code 5.41 Inverter Circuit Abnormality Applicable All outdoor unit models Models Error Code Method of Error Error is detected based on the current value during waveform output before starting Detection compressor. Error is detected based on the value from current sensor during synchronous operation when starting the unit.
  • Page 272 Troubleshooting by Error Code SiAF332111E Troubleshooting RXQ4/5AR, RXMQ6/10/12AR Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Then, turn on the power again. Does the power It is supposed that the error results supply normally come from external causes other than...

  • Page 273: Momentary Power Failure During Test Operation

    SiAF332111E Troubleshooting by Error Code 5.42 Momentary Power Failure during Test Operation Applicable RXMQ8AR Models Error Code Method of Error Momentary power failure is detected by the PCB. Detection Error Decision Judgment is made by AC power frequency detection circuit on the outdoor unit main PCB Conditions Supposed ...

  • Page 274: Radiation Fin Temperature Rise Abnormality

    Troubleshooting by Error Code SiAF332111E 5.43 Radiation Fin Temperature Rise Abnormality 5.43.1 Radiation Fin Temperature Rise Abnormality (4/5 HP Models) Applicable RXQ4/5AR Models Error Code Method of Error The radiation fin temperature is detected by the radiation fin thermistor. Detection Error Decision The radiation fin temperature exceeds a certain temperature.
  • Page 275 SiAF332111E Troubleshooting by Error Code 5.43.2 Radiation Fin Temperature Rise Abnormality (6/8 HP Models) Applicable RXMQ6/8AR Models Error Code Method of Error Detect temperature of power module of the inverter circuit. Detection Error Decision Thermistor located inside the power module of the inverter circuit for compressor and fan motor. Conditions Cooling tube plate poor heat-exchange.
  • Page 276 Troubleshooting by Error Code SiAF332111E  Subcode L4-06 Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the cooling conditions of the inverter heat sink. (1) Is the heat sink properly fixed with screws? (2) Error code U0 is displayed on the Error History...
  • Page 277 SiAF332111E Troubleshooting by Error Code 5.43.3 Radiation Fin Temperature Rise Abnormality (10/12 HP Models) Applicable RXMQ10/12AR Models Error Code Method of Error Use the thermistor to test the radiation fin temperature of the inverter PCB of the compressor. Detection Error Decision Error is determined when the PCB circuit thermistor detects a temperature higher than the Conditions designed temperature.

  • Page 278: Compressor Instantaneous Overcurrent

    Troubleshooting by Error Code SiAF332111E 5.44 Compressor Instantaneous Overcurrent 5.44.1 Compressor Instantaneous Overcurrent (4/5/10/12 HP Models) Applicable RXQ4/5AR, RXMQ10/12AR Models Error Code Method of Error Error is detected from current flowing in the power transistor. Detection Error Decision An excessive current flows in the power transistor. Conditions Supposed ...
  • Page 279 SiAF332111E Troubleshooting by Error Code 5.44.2 Compressor Instantaneous Overcurrent (6/8 HP Models) Applicable RXMQ6/8AR Models Error Code Method of Error Detect current flowing through the power transistor. Detection Error Decision The current instantaneously exceeds A (A) in the power transistor. Conditions Trigger point Compressor model...
  • Page 280 Troubleshooting by Error Code SiAF332111E Power OFF insulation resistance of the Replace the compressor compressor is 100 k: or less. (M1C). The internal wiring of the Replace the compressor compressor coil is (M1C). defective. CHECK 4 Is the power Replace the relevant transistor normal? PCB ( 1 ).

  • Page 281: Compressor Overcurrent

    SiAF332111E Troubleshooting by Error Code 5.45 Compressor Overcurrent 5.45.1 Compressor Overcurrent (4/5/10/12 HP Models) Applicable RXQ4/5AR, RXMQ10/12AR Models Error Code Method of Error Error is detected by current flowing in the power transistor. Detection Error Decision Overload in the compressor is detected. Conditions Supposed ...
  • Page 282 Troubleshooting by Error Code SiAF332111E 5.45.2 Compressor Overcurrent (6/8 HP Models) Applicable RXMQ6/8AR Models Error Code Method of Error Detect current flowing through the power transistor. Detection Error Decision (1) The secondary-side inverter current exceeds A (A) for a period of 5 consecutive seconds. Conditions (2) The secondary-side inverter current exceeds B (A) for a period of 260 consecutive seconds.
  • Page 283 SiAF332111E Troubleshooting by Error Code Power OFF insulation resistance of the Replace the compressor compressor is 100 k: or (M1C). less to ground. The internal wiring of the Replace the compressor compressor coil is (M1C). defective. CHECK 4 Is the power Replace the relevant transistor normal? PCB ( 1) .

  • Page 284: Compressor Startup Abnormality

    Troubleshooting by Error Code SiAF332111E 5.46 Compressor Startup Abnormality 5.46.1 Compressor Startup Abnormality (4/5 HP Models) Applicable RXQ4/5AR Models Error Code Method of Error Error is detected by the power transistor current. Detection Error Decision Compressor overload during activation Conditions Supposed ...
  • Page 285 SiAF332111E Troubleshooting by Error Code 5.46.2 Compressor Startup Abnormality (6-12 HP Models) Applicable RXMQ6-12AR Models Error Code Method of Error Detect error according to the signal waveform of compressor. Detection Error Decision When compressor startup operation has not been completed. Conditions Supposed ...
  • Page 286 Troubleshooting by Error Code SiAF332111E From the previous page (Startup failure in aging operation) Refrigerant is stagnated. (The unit is out of power Solve the refrigerant stagnation. supply for more than (Power should be supplied for more 6 hours.) than 6 hours.) Is the insulation resistance of the...

  • Page 287: Transmission Error Between Microcomputers On Outdoor Unit Main Pcb

    SiAF332111E Troubleshooting by Error Code 5.47 Transmission Error between Microcomputers on Outdoor Unit Main PCB Applicable RXQ4/5AR, RXMQ6AR Models Error Code Method of Error Check for the transmission conditions between microcomputers on the outdoor unit main PCB Detection using a microcomputer. Error Decision Normal transmission is disabled for a given period of time or more.
  • Page 288 Troubleshooting by Error Code SiAF332111E RXMQ6AR Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the harness between terminal block Properly connect the harness. and outdoor unit main PCB securely connected? ( 1) The insulation...

  • Page 289: Transmission Error Between Inverter Pcb And Outdoor Unit Main Pcb

    SiAF332111E Troubleshooting by Error Code 5.48 Transmission Error between Inverter PCB and Outdoor Unit Main PCB Applicable RXMQ8-12AR Models Error Code Method of Error Check for the transmission conditions between the inverter PCB and the outdoor unit main PCB Detection using a microcomputer.
  • Page 290 Troubleshooting by Error Code SiAF332111E The service monitor (green) on the This is not the LC error. outdoor unit main PCB (A1P) is Recheck the error code. blinking. The service The fuse of the monitor (green) on the Replace the inverter PCB (A3P). noise filter PCB has blown inverter PCB (A3P) is out.

  • Page 291: Inverter Circuit Capacitor High Voltage

    SiAF332111E Troubleshooting by Error Code 5.49 Inverter Circuit Capacitor High Voltage Applicable RXQ4/5AR, RXMQ6AR Models Error Code Method of Error The voltage waveform of the main circuit capacitor of the inverter is used to check for errors. Detection Error Decision The voltage waveform fluctuates greatly.

  • Page 292: Power Supply Voltage Imbalance

    Troubleshooting by Error Code SiAF332111E 5.50 Power Supply Voltage Imbalance Applicable RXMQ8-12AR Models Error Code Method of Error Detect voltage imbalance through inverter PCB. Detection Error Decision Power supply voltage imbalance exceeds certain value. Conditions RXMQ8AR: approximately 12 V RXMQ10/12AR: approximately 6 V Error is not decided while the unit operation is continued.
  • Page 293 Use the document “Notice of Inspection Results” attached to spare part. Explanation to users Be sure to explain user that “power supply Hand the “Notice of Inspection Results” to user to ask voltage imbalance” will occur and Daikin him/her to rectify the imbalance. accepts no responsibility for the imbalance. Note(s) 1.

  • Page 294: Reactor Temperature Abnormality

    Troubleshooting by Error Code SiAF332111E 5.51 Reactor Temperature Abnormality Applicable RXMQ8AR Models Error Code 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 Conditions in it.

  • Page 295: Radiation Fin Temperature Abnormality

    SiAF332111E Troubleshooting by Error Code 5.52 Radiation Fin Temperature Abnormality Applicable RXQ4/5AR, RXMQ6/8AR Models Error Code Method of Error Detect the resistance of the following thermistors during the compressor stops running: Detection (1) Radiation fin thermistor (2) Thermistor located in PCB circuit Error Decision When the resistance of the thermistor comes to a value equivalent to open or short circuit.
  • Page 296 Troubleshooting by Error Code SiAF332111E Troubleshooting  Subcode P4-01 Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Make measurement of resistance of the radiation fin thermistor. CHECK 11 Is the resistance of the Replace the relevant PCB ( 1 ).

  • Page 297: Incorrect Inverter And Fan Drive Combination

    SiAF332111E Troubleshooting by Error Code 5.53 Incorrect Inverter and Fan Drive Combination Applicable RXQ4/5AR, RXMQ10/12AR Models Error Code Method of Error Test is performed based on communication with inverter. Detection Error Decision Communication data is used to determine if the types of the inverter PCB and fan PCB are Conditions correct.

  • Page 298: Field Setting After Replacing Outdoor Unit Main Pcb Abnormality Or Combination Of Pcb Abnormality

    Troubleshooting by Error Code SiAF332111E 5.54 Field Setting after Replacing Outdoor Unit Main PCB Abnormality or Combination of PCB Abnormality Applicable RXMQ6/8AR Models Error Code Method of Error This error is detected according to communications with the outdoor unit main PCB Detection (RXMQ6AR) or inverter PCB (RXMQ8AR).

  • Page 299: Refrigerant Shortage

    SiAF332111E Troubleshooting by Error Code 5.55 Refrigerant Shortage 5.55.1 Refrigerant Shortage (4/5 HP Models) Applicable RXQ4/5AR Models Error Code Method of Error Refrigerant shortage check is conducted based on the discharge pipe thermistor temperature and the low-pressure saturated temperature. Detection Error Decision Microcomputer is used to determine and check for system refrigerant shortage.
  • Page 300 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the low pressure less or equal Is it cooling? Refrigerant shortage, closed to 0.25 MPa? stop valve, or blocked cooling system.
  • Page 301 SiAF332111E Troubleshooting by Error Code 5.55.2 Refrigerant Shortage (6/8 HP Models) Applicable RXMQ6/8AR Models Error Code Sub code: 05 Method of Error Detects refrigerant shortage according to the ending conditions of cooling oil return control. Detection Error Decision Cooling oil return control does not finish according to the ending conditions, and the time is Conditions up for 3 consecutive times.
  • Page 302 Troubleshooting by Error Code SiAF332111E 5.55.3 Refrigerant Shortage (10/12 HP Models) Applicable RXMQ10/12AR Models Error Code Method of Error Refrigerant shortage check is conducted based on the discharge pipe thermistor temperature Detection and the low-pressure saturated temperature. Error Decision Low pressure becomes 0.1 MPa or below. Conditions Supposed ...

  • Page 303: Open Phase

    SiAF332111E Troubleshooting by Error Code 5.56 Open Phase Applicable RXMQ8AR Models Error Code Method of Error The phase of each phase is detected by phase detection circuit and open phase is judged. Detection Error Decision When any phase is open phase. Conditions Supposed ...

  • Page 304: Reverse Phase, Open Phase

    Troubleshooting by Error Code SiAF332111E 5.57 Reverse Phase, Open Phase Applicable RXMQ10/12AR Models Error Code Method of Error Each phase is detected by reverse phase detection circuit and it is determined whether the Detection phase is reversed or not. Error Decision The power supply is in reverse phase, or T phase is in open phase.

  • Page 305: Power Supply Insufficient Or Instantaneous Abnormality

    SiAF332111E Troubleshooting by Error Code 5.58 Power Supply Insufficient or Instantaneous Abnormality 5.58.1 Power Supply Insufficient or Instantaneous Abnormality (4/5 HP Models) Applicable RXQ4/5AR Models Error Code Method of Error The main circuit capacitor voltage of the inverter and the power supply voltage is checked. Detection Error Decision The main circuit capacitor of the tested inverter has abnormal voltage or the power supply...
  • Page 306 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the power supply voltage Calibrate the power voltage. between L and N between 220-240 V ±10%? CHECK 4 Check the power transistor.
  • Page 307 SiAF332111E Troubleshooting by Error Code 5.58.2 Power Supply Insufficient or Instantaneous Abnormality (6/8 HP Models) Applicable RXMQ6/8AR Models Error Code Method of Error Detect the voltage of capacitor of the main circuit in the outdoor unit main PCB. Detection Error Decision When the voltage in the DC circuit (between diode module and power module) falls below Conditions 220-240 VDC (RXMQ6AR) or 380 VDC (RXMQ8AR).
  • Page 308 Troubleshooting by Error Code SiAF332111E The insulation resistance of the fan Replace the fan motor. motor is less If the motor gets severely than 1 M:. damaged, the outdoor unit main PCB (A1P) should also be replaced. CHECK 4 Is the power Replace the outdoor unit transistor normal? main PCB (A1P).
  • Page 309 SiAF332111E Troubleshooting by Error Code RXMQ8AR Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for power supply conditions. (1) Power supply voltage falls within the range of 380 to 415 V? (2) Any open phase in the power supply wiring or any...
  • Page 310 Troubleshooting by Error Code SiAF332111E Turn ON the power supply, and then press the ON button. system enters standby mode before the Replace the inverter PCB outdoor unit fan starts (A3P). rotating. The system enters standby mode before completing Replace the inverter PCB the startup operation of the (A3P).
  • Page 311 SiAF332111E Troubleshooting by Error Code 5.58.3 Power Supply Insufficient or Instantaneous Abnormality (10/12 HP Models) Applicable RXMQ10/12AR Models Error Code Method of Error Error of voltage of main circuit capacitor built in the inverter and power supply voltage. Detection Error Decision When the voltage of main circuit capacitor built in the inverter and power supply voltage is less Conditions than 320 V.
  • Page 312 Troubleshooting by Error Code SiAF332111E CHECK 4 Replace the inverter Is the power transistor normal? PCB (A3P). Unplug the following connectors. (1)X4A(A3P)↔X20A(A1P) (2)X6A(A3P)↔X28A(A1P) Is inverter PCB Replace the inverter damaged? PCB (A3P). (If inverter PCB is seriously damaged, there may be fault with the compressor and the Turn on the operating fan motor.)

  • Page 313: Check Operation Not Executed

    SiAF332111E Troubleshooting by Error Code 5.59 Check Operation Not Executed Applicable All outdoor unit models Models Error Code Method of Error The check operation has not been executed. Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions Supposed ...
  • Page 314 Troubleshooting by Error Code SiAF332111E RXMQ6/8AR Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. The contents of individual failures vary with sub code. Ensure the sub code, and then go to the following: U3-02 Conduct the test operation.
  • Page 315 SiAF332111E Troubleshooting by Error Code RXMQ10/12AR Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Error type varies according to the error code. Check the error code and take the following steps. U3-03 Perform a test operation.

  • Page 316: Transmission Error Between Indoor Units And Outdoor Units

    Troubleshooting by Error Code SiAF332111E 5.60 Transmission Error between Indoor Units and Outdoor Units Applicable All indoor unit models All outdoor unit models Models Error Code Method of Error Microcomputer checks if transmission between indoor and outdoor units is normal. Detection Error Decision Transmission is not carried out normally for a certain amount of time.
  • Page 317 SiAF332111E Troubleshooting by Error Code Is the connector wiring between Outdoor unit the outdoor unit main PCB (A1P) and Replace the broken wires main PCB microcomputer the inverter PCB (A2P) and then restart operation. monitor (HAP) damaged? blinks. Is the voltage between outdoor unit main Provide power voltage of PCB terminal L and...
  • Page 318 Troubleshooting by Error Code SiAF332111E RXMQ6-12AR 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 Go to the next page. U4-03 (Indoor unit system transmission error) Has the...
  • Page 319 SiAF332111E Troubleshooting by Error Code U4-03 Indication after launch test Check controller indoor units: operation? (1) Some error about thermistor, or fan motor, electronic expansion valve, or defective PCB. (2) Test operation was interrupted by the MODE Operate all indoor units. (BS1) button.

  • Page 320: Transmission Error Between Remote Controller And Indoor Unit

    Troubleshooting by Error Code SiAF332111E 5.61 Transmission Error between Remote Controller and Indoor Unit Applicable All indoor unit models Models Error code Method of Error Microcomputer checks if transmission between indoor unit and remote controller is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time.

  • Page 321: Transmission Error Between Main And Sub Remote Controllers

    SiAF332111E Troubleshooting by Error Code 5.62 Transmission Error between Main and Sub Remote Controllers Applicable All indoor unit models Models Error code Method of Error In case of controlling with 2 remote controllers, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub remote controller) is normal.

  • Page 322: Other Indoor Units And Outdoor Unit Abnormality

    Troubleshooting by Error Code SiAF332111E 5.63 Other Indoor Units and Outdoor Unit Abnormality Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error Detect the error signal for the other indoor unit within the circuit by outdoor unit main PCB. Detection Error Decision The error decision is made on any other indoor units within the system concerned.

  • Page 323: Improper Combination Of Indoor Unit And Outdoor Unit, Indoor Unit And Remote Controller

    SiAF332111E Troubleshooting by Error Code 5.64 Improper Combination of Indoor Unit and Outdoor Unit, Indoor Unit and Remote Controller Applicable All indoor unit models All outdoor unit models Models Error Code Method of Error A difference occurs in data by the type of refrigerant between indoor and outdoor units. Detection The number of indoor units connected is out of the allowable range.
  • Page 324 Troubleshooting by Error Code SiAF332111E Troubleshooting RXQ4/5AR Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the outdoor unit and indoor unit combination Change the mismatched indoor or according to the outdoor units according to the catalog? catalog.
  • Page 325 SiAF332111E Troubleshooting by Error Code RXMQ6-12AR 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 326: Address Duplication Of Centralized Controller

    Troubleshooting by Error Code SiAF332111E 5.65 Address Duplication of Centralized Controller Applicable All indoor unit models Models Centralized controller Error Code Method of Error An 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 327: Transmission Error Between Centralized Controller And Indoor Unit

    SiAF332111E Troubleshooting by Error Code 5.66 Transmission Error between Centralized Controller and Indoor Unit Applicable All indoor unit models Schedule timer Models Central remote controller intelligent Touch Controller Error Code Method of Error Microcomputer checks if transmission between indoor unit and centralized controller is normal. Detection Error Decision Transmission is not carried out normally for a certain amount of time...
  • Page 328 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the indoor unit for which UE is displayed. Is the transmission error UE caused on all indoor units? Is the...
  • Page 329 SiAF332111E 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 Has the main centralized controller setting Correct the connection of the connector been...

  • Page 330: System Not Set Yet

    Troubleshooting by Error Code SiAF332111E 5.67 System Not Set Yet Applicable All indoor unit models Models All outdoor unit models Error Code Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to Detection that of indoor units that have made changes in temperature.
  • Page 331 SiAF332111E Troubleshooting by Error Code RXMQ6/8AR Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Are the stop Open the stop valve. valves opened? indoor-outdoor Is the check unit transmission wiring operation Replace the indoor unit PCB.

  • Page 332: System Abnormality, Refrigerant System Address Undefined

    Troubleshooting by Error Code SiAF332111E 5.68 System Abnormality, Refrigerant System Address Undefined Applicable All indoor unit models All outdoor unit models Models Error Code Method of Error System detects an indoor unit whose address is not defined by automatic address function. ...

  • Page 333: Defective Pcb

    SiAF332111E Troubleshooting by Error Code 5.69 Defective PCB Applicable Centralized controller Models intelligent Touch Controller Schedule timer Error Code Method of Error DIII-NET polarity circuit defective conditions are used to detect the error. Detection Error Decision The test detects both positive polarity and negative polarity. Conditions Supposed ...

  • Page 334: Transmission Error (Between Centralized Controllers)

    Troubleshooting by Error Code SiAF332111E 5.70 Transmission Error (between Centralized Controllers) Applicable Centralized controller Models intelligent Touch Controller Schedule timer Error Code Method of Error DIII-NET communication data is used to detect the error. (Automatic reset) Detection Error Decision When the sub centralized controller is activated, there is no main centralized controller. Conditions The previously connected centralized controller is not responding.

  • Page 335: Poor Centralized Controller Combination

    SiAF332111E Troubleshooting by Error Code 5.71 Poor Centralized Controller Combination Applicable Centralized controller Models intelligent Touch Controller Schedule timer Error Code Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision There are other centralized controllers but the schedule timer is set for individual use. Conditions There are multiple main centralized controllers.

  • Page 336: Address Duplication, Poor Setting

    Troubleshooting by Error Code SiAF332111E 5.72 Address Duplication, Poor Setting Applicable Centralized controller Models intelligent Touch Controller Schedule timer Error Code Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision Multiple centralized controllers or intelligent touch controllers are connected, and the controllers Conditions are both set as main centralized controllers or sub centralized controllers.

  • Page 337: Operation Lamp Blinking

    SiAF332111E Troubleshooting by Error Code 5.73 Operation Lamp Blinking Applicable ON/OFF controller Models Indoor unit – Error Code Method of Error DIII-NET communication data is used to detect the error. Detection – Error Decision Conditions Supposed  Defective transmission between the centralized controller and an indoor unit Causes ...
  • Page 338 Troubleshooting by Error Code SiAF332111E Does all the indoor the indoor unit units experiencing on which the error occurred Correct the setting of set the group No.? transmission the group No. failure? ON/OFF controller Is the main centralized controller connection Correct the wiring.

  • Page 339: Central Control Indicator Lamp Blinking (One Blink)

    SiAF332111E Troubleshooting by Error Code 5.74 Central Control Indicator Lamp Blinking (One blink) Applicable ON/OFF controller Models Centralized controller Schedule timer – Error Code Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision  The previously connected centralized controller is not responding. Conditions ...
  • Page 340 Troubleshooting by Error Code SiAF332111E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Are any connected centralized Concurrently reset the controllers removed or the power supply of all the address changed? centralized controllers.
  • Page 341 SiAF332111E Troubleshooting by Error Code Is the ON/OFF Do two or controller control range more ON/OFF controllers Modify the setting of the setting switch set connect? ON/OFF controller control duplicately? range setting switch. Reset the power supply of the ON/OFF controller. Does the remote control adaptor Not available for combined use with...

  • Page 342: Central Control Indicator Lamp Blinking (Two Blinks)

    Troubleshooting by Error Code SiAF332111E 5.75 Central Control Indicator Lamp Blinking (Two blinks) Applicable ON/OFF controller Models – Error Code Method of Error DIII-NET communication data is used to detect the error. Detection Error Decision The indoor unit has no centralized control address set Conditions No indoor unit within the control range Supposed...

  • Page 343: Check

    SiAF332111E Check 6. Check High Pressure Check CHECK 1 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. mCheck to be sure the stop valve is open. Stop valve closed Local High pipe mConduct visual checks for pipe conditions. Bent or crashed pipe pressure resistance...

  • Page 344: Low Pressure Check

    Check SiAF332111E Low Pressure Check CHECK 2 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. mIs the pressure value checked with the Service Checker Defective low pressure sensor Defective corresponding to the measurement of the pressure sensor? compressor Defective mAre the voltage characteristics normal?

  • Page 345: Superheat Operation Check

    SiAF332111E Check Superheat Operation Check CHECK 3 Identify the defective points referring to the failure factor analysis (FTA) as follows. Hot gas circuit clogging Defective hot Defective solenoid gas bypass m Check if coil resistance and insulation valve coil control are normal.

  • Page 346: Power Transistor Check

    Check SiAF332111E Power Transistor Check CHECK 4 RXQ4/5AR, RXMQ10/12AR Use a multimeter to measure the resistance to determine if the power transistor is defective or not. 1. Do not touch live parts (high voltage parts) within 10 minutes after turning off the power supply.
  • Page 347 SiAF332111E Check RXMQ6AR Use a multimeter to measure the resistance to determine if the power transistor is defective or not. 1. Do not touch live parts (high voltage parts) within 10 minutes after turning off the power supply. 2. Touch the earth terminal with your hand to release static electricity. (This is to avoid damaging the PCB.) 3.
  • Page 348 Check SiAF332111E RXMQ8AR 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.  Prepare the analog type of multimeter. Preparation Multimeter For the digital type of multimeter, those with diode check function are available for the checking.
  • Page 349 SiAF332111E Check PCB and Circuit Diagram Part 6 Service Diagnosis...

  • Page 350: Wet Operation Check

    Check SiAF332111E Wet Operation Check CHECK 5 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. Defective crankcase heater Refrigerant stagnation Frequent ON/OFF of compressor ←Refer to CHECK 6 . Overcharge of refrigerant [In cooling] Defective Indoor unit ←...

  • Page 351: Refrigerant Overcharge Check

    SiAF332111E Check Refrigerant Overcharge Check CHECK 6 In case of VRV systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgment, refer to the information below. Diagnosis of refrigerant overcharge 1.

  • Page 352: Refrigerant Shortage Check

    Check SiAF332111E 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 refrigerant shortage 1.

  • Page 353: Vacuuming And Dehydration Procedure

    SiAF332111E Check Vacuuming and Dehydration Procedure CHECK 8 Conduct vacuuming and dehydration in the piping system following the procedure for Normal vacuuming and dehydration described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for Special vacuuming and dehydration described below.

  • Page 354: Inverter-Related Error Codes

    Check SiAF332111E Inverter-Related Error Codes CHECK 9 Code Name Condition for determining error Major cause Compressor Instantaneous overcurrent • Inverter output current exceeds A • Liquid sealing current of compressor (A) even instantaneously. • Defective compressor • Defective inverter PCB Overcurrent of •...

  • Page 355: Concept Of Inverter-Related Error Codes

    SiAF332111E Check 6.10 Concept of Inverter-Related Error Codes CHECK 10 Transmission error When transmissions between the main PCB and the inverter PCB are not normal Instantaneous overcurrent of compressor (When inverter output current exceeds A (A) even instantaneously) Overcurrent of compressor (1) A current of B (A) or more continues for a period of consecutive 5 seconds.

  • Page 356: Thermistor Check

    Check SiAF332111E 6.11 Thermistor Check CHECK 11 Thermistor type of indoor units Model Indoor heat exchanger Indoor heat exchanger Suction air thermistor (liquid) thermistor (gas) thermistor FXFSQ-AR Type C Type A FXMQ-PB Type A FXMQ-AR Type B Type J FXAQ-P Thermistor type of outdoor units RXQ4AR RXQ5AR...
  • Page 357 SiAF332111E Check Resistance (k) Thermistor temperature (°C) Type A Type B Type C Type E Type F –30 363.8 361.7719 — 357.9 354.1 –25 266.8 265.4704 — 263.5 259.7 –20 197.8 196.9198 — 196.1 192.6 –15 148.2 147.5687 — 147.4 144.2 –10 112.0...
  • Page 358 Check SiAF332111E Resistance (k) Thermistor temperature (°C) Type G Type H Type J Type K –30 4759 3407 352.1 350.6 –25 3454 2540 261.2 257.4 –20 2534 1910 195.4 191.0 –15 1877 1449 147.3 143.2 –10 1404 1108 111.8 108.4 –5 1059 853.8...

  • Page 359: Pressure Sensor Check

    SiAF332111E Check 6.12 Pressure Sensor Check CHECK 12 Pressure Sensor and Voltage Characteristics 4.15 4.15 Detected Pressure (MPa) = × V – × 0.5 (kg/cm )(MPa) (MPa) = × V – × 0.5 51.0 5.0 : High pressure (MPa) 45.9 : Low pressure (MPa) High Pressure (P : Output Voltage (High Side) (VDC)

  • Page 360: Master Unit Centralized Connector Setting Table

    Check SiAF332111E 6.13 Master Unit Centralized Connector Setting Table CHECK 13 The master unit centralized setting connector (CN1/X1A) is mounted at the factory.  To independently use a single unit of the intelligent Touch Controller or a single unit of the central remote controller, do not dismount the master unit centralized setting connector (i.e., use the connector with the factory setting unchanged).

  • Page 361: Master-Slave Unit Setting Table

    SiAF332111E Check 6.14 Master-Slave Unit Setting Table CHECK 14 Combination of intelligent Touch Controller and Central Remote Controller Master Slave  Pattern Master/ Master/ Master/ Master/ 1-00~4-15 5-00~8-15 1-00~4-15 5-00~8-15 Slave Slave Slave Slave Master Master Slave Slave Master — —...

  • Page 362: Fan Motor Connector Check (Power Supply Cable)

    Check SiAF332111E 6.16 Fan Motor Connector Check (Power Supply Cable) CHECK 16 Check the fan motor connector according to the following procedure. Outdoor unit RXMQ6-12AR 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 363: Fan Motor Connector Check (Signal Cable)

    SiAF332111E Check 6.17 Fan Motor Connector Check (Signal Cable) CHECK 17 Check the fan motor connector according to the following procedure. Outdoor Unit RXQ4/5AR 1. Turn OFF the power supply. 2. Remove the connector (X106A) on the PCB to measure the resistance value. Judgment criteria: resistance value between each phase is within ±20% X106A White (1)

  • Page 364: Electronic Expansion Valve Coil Check

    Check SiAF332111E 6.18 Electronic Expansion Valve Coil Check CHECK 18 Remove the connector for electronic expansion valve from PCB. Measure the resistance value between pins and check the continuity to judge the condition. The normal products will show the following conditions. Outdoor unit RXMQ6/8AR X22A (Y2E) for 8 HP...
  • Page 365 SiAF332111E Check FXMQ-AR White (1) Measuring points Judgment criteria No continuity Red (6) 300 : Orange (3) 150 : 300 : 150 : Yellow Blue Blue — Orange Yellow White FXAQ-P Measuring points Judgment criteria White (1) No continuity Red (5) 300 : 150 : Orange (3)
  • Page 366 SiAF332111E Part 7 Appendix 1. Wiring Diagrams..................361 1.1 Outdoor Unit ..................361 1.2 VRV Indoor Unit ...................366 Part 7 Appendix...
  • Page 367 SiAF332111E Wiring Diagrams 1. Wiring Diagrams Outdoor Unit RXQ4ARV1 Part 7 Appendix...
  • Page 368 Wiring Diagrams SiAF332111E RXQ5ARV1 Part 7 Appendix...
  • Page 369 SiAF332111E Wiring Diagrams RXMQ6ARV1 C: 3D137051 Part 7 Appendix...
  • Page 370 Wiring Diagrams SiAF332111E RXMQ8ARY1 C: 3D137060 Part 7 Appendix...
  • Page 371 SiAF332111E Wiring Diagrams RXMQ10/12ARY1 Part 7 Appendix...
  • Page 372 Wiring Diagrams SiAF332111E VRV Indoor Unit 1.2.1 Round Flow Cassette with Sensing FXFSQ25/32/40/50/63/80/100/125/140ARV1 Part 7 Appendix...
  • Page 373 SiAF332111E Wiring Diagrams 1.2.2 Auto Grille Panel BYCQ125EBSF (Auto Grille Panel for FXFSQ-AR) Part 7 Appendix...
  • Page 374 Wiring Diagrams SiAF332111E 1.2.3 Middle-high Static Pressure Duct FXMQ40/50/63/80/100/125/140PBV1 Part 7 Appendix...
  • Page 375 SiAF332111E Wiring Diagrams FXMQ40/50/63/80/100ARV1 Part 7 Appendix...
  • Page 376 Wiring Diagrams SiAF332111E 1.2.4 Wall Mounted FXAQ20/25/32PVE, FXAQ40/50/63PVER1 Part 7 Appendix...
  • Page 377 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. z Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

This manual is also suitable for:

Vrv s rxmq6arv1Vrv s rxmq8ary1Vrv s rxmq10ary1Vrv s rxmq12ary1

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