Daikin FTX20JV1B Service Manual
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Daikin FTX20JV1B Service Manual

Inverter pair wall mounted type j-series
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Service
Manual
Inverter Pair
Wall Mounted Type J-Series
SiBE041010EA
[Applied Models]
Inverter Pair : Heat Pump

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Summary of Contents for Daikin FTX20JV1B

  • Page 1 SiBE041010EA Service Manual Inverter Pair Wall Mounted Type J-Series [Applied Models] Inverter Pair : Heat Pump...
  • Page 2 SiBE041010EA Inverter Pair Wall Mounted Type J-Series Heat Pump Indoor Unit FTX20JV1B ATX20JV1B FTX25JV1B ATX25JV1B FTX35JV1B ATX35JV1B FTX20J2V1B ATX20J2V1B FTX25J2V1B ATX25J2V1B FTX35J2V1B ATX35J2V1B Outdoor Unit RX20JV1B ARX20JV1B RX25JV1B ARX25JV1B RX35JV1B ARX35JV1B RX20J3V1B ARX20J3V1B RX25J3V1B ARX25J3V1B RX35J3V1B ARX35J3V1B The removal procedure for each model is separately bound. Refer to page 103 for the booklet number of applicable model.

  • Page 3: Table Of Contents

    SiBE041010EA 1. Introduction .....................v 1.1 Safety Cautions ..................v 1.2 Used Icons ....................x Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............4 1. Specifications ..................5 Part 3 Printed Circuit Board Connector Wiring Diagram ... 13 1. Indoor Unit.....................14 2.
  • Page 4 SiBE041010EA Part 6 Service Diagnosis............. 45 1. Troubleshooting with LED ..............46 1.1 Indoor Unit....................46 1.2 Outdoor Unit ...................46 2. Problem Symptoms and Measures ............47 3. Service Check Function ................48 4. Troubleshooting ..................51 4.1 Error Codes and Description ..............51 4.2 Indoor Unit PCB Abnormality ..............52 4.3 Freeze-up Protection Control or Heating Peak-cut Control....53 4.4 Fan Motor (DC Motor) or Related Abnormality........54 4.5 Thermistor or Related Abnormality (Indoor Unit)........56...
  • Page 5 SiBE041010EA 2. Trial Operation ..................96 3. Field Settings ..................97 3.1 When 2 Units are Installed in 1 Room............97 3.2 Jumper Settings ..................97 4. Silicon Grease on Power Transistor / Diode Bridge......98 Part 8 Appendix................99 1. Piping Diagrams..................100 1.1 Indoor Unit....................100 1.2 Outdoor Unit ..................101 2.

  • Page 6: Introduction

    Introduction SiBE041010EA 1. Introduction Safety Cautions Cautions and Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “ Warning” and “ Caution”. The “ Warning” Warnings items are especially important since they can lead to death or serious injury if they are not followed closely.
  • Page 7 SiBE041010EA Introduction Warning Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug. Plugging or unplugging the power cable plug 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 at a high place (more than 2 m).
  • Page 8 Introduction SiBE041010EA Caution Use the welder in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency. 1.1.2 Cautions Regarding Safety of Users Warning Do not store the equipment in a room with successive fire sources (e.g., naked flame, gas appliance, electric heater).
  • Page 9 SiBE041010EA Introduction Warning Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R- 22) in the refrigerant system. If air enters the refrigerating system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.
  • Page 10 Introduction SiBE041010EA Caution Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections may cause excessive heat generation, fire or an electrical shock. If the installation platform or frame has corroded, replace it.

  • Page 11: Used Icons

    SiBE041010EA Introduction Used Icons Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in the table below: Icon Type of Description Information Note A “note” provides information that is not indispensable, but may nevertheless be valuable to the reader, such as tips and tricks.

  • Page 12: Part 1 List Of Functions

    SiBE041010EA Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 13: Functions

    SiBE041010EA Functions 1. Functions Category Functions Category Functions Basic Inverter Health & Air-purifying filter — — Function (with inverter power control) Clean Operation limit for cooling (°CDB) Photocatalytic deodorizing filter — — Air-purifying filter with photocatalytic – – Operation limit for heating (°CWB) —...
  • Page 14 Functions SiBE041010EA Category Functions Category Functions Basic Inverter Health & Air-purifying filter — — Function (with inverter power control) Clean Operation limit for cooling (°CDB) Photocatalytic deodorizing filter — — Air-purifying filter with photocatalytic – – Operation limit for heating (°CWB) —...

  • Page 15: Part 2 Specifications

    SiBE041010EA Part 2 Specifications 1. Specifications ..................5 Specifications...

  • Page 16: Specifications

    Specifications SiBE041010EA 1. Specifications 50 Hz, 230 V Indoor Unit FTX20JV1B FTX25JV1B Model RX20JV1B RX25JV1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.6) 2.5 (1.3 ~ 3.5) 2.5 (1.3 ~ 3.0) 2.8 (1.3 ~ 4.0) Capacity Btu/h 6,800 (4,400 ~ 8,900)
  • Page 17 SiBE041010EA Specifications 50 Hz, 230 V Indoor Unit FTX35JV1B Model RX35JV1B Outdoor Unit Cooling Heating 3.3 (1.3 ~ 3.8) 3.5 (1.3 ~ 4.8) Capacity Btu/h 11,300 (4,400 ~ 13,000) 11,900 (4,400 ~ 16,400) Rated (Min. ~ Max.) kcal/h 2,840 (1,120 ~ 3,270) 3,010 (1,120 ~ 4,130) Running Current (Rated) Power Consumption...
  • Page 18 Specifications SiBE041010EA 50 Hz, 230 V Indoor Unit FTX20J2V1B FTX25J2V1B Model RX20J3V1B RX25J3V1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.6) 2.5 (1.3 ~ 3.5) 2.5 (1.3 ~ 3.0) 2.8 (1.3 ~ 4.0) Capacity Btu/h 6,800 (4,400 ~ 8,900) 8,500 (4,400 ~ 11,900) 8,500 (4,400 ~ 10,200) 9,600 (4,400 ~ 13,600)
  • Page 19 SiBE041010EA Specifications 50 Hz, 230 V Indoor Unit FTX35J2V1B Model RX35J3V1B Outdoor Unit Cooling Heating 3.3 (1.3 ~ 3.8) 3.5 (1.3 ~ 4.8) Capacity Btu/h 11,300 (4,400 ~ 13,000) 11,900 (4,400 ~ 16,400) Rated (Min. ~ Max.) kcal/h 2,840 (1,120 ~ 3,270) 3,010 (1,120 ~ 4,130) Running Current (Rated) Power Consumption...
  • Page 20 Specifications SiBE041010EA 50 Hz, 230 V Indoor Unit ATX20JV1B ATX25JV1B Model ARX20JV1B ARX25JV1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.6) 2.5 (1.3 ~ 3.5) 2.5 (1.3 ~ 3.0) 2.8 (1.3 ~ 4.0) Capacity Btu/h 6,800 (4,400 ~ 8,900) 8,500 (4,400 ~ 11,600) 8,500 (4,400 ~ 10,200) 9,600 (4,400 ~ 13,600)
  • Page 21 SiBE041010EA Specifications 50 Hz, 230 V Indoor Unit ATX35JV1B Model ARX35JV1B Outdoor Unit Cooling Heating 3.3 (1.3 ~ 3.8) 3.5 (1.3 ~ 4.8) Capacity Btu/h 11,300 (4,400 ~ 13,000) 11,900 (4,400 ~ 16,400) Rated (Min. ~ Max.) kcal/h 2,840 (1,120 ~ 3,270) 3,010 (1,120 ~ 4,130) Running Current (Rated) Power Consumption...
  • Page 22 Specifications SiBE041010EA 50 Hz, 230 V Indoor Unit ATX20J2V1B ATX25J2V1B Model ARX20J3V1B ARX25J3V1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.6) 2.5 (1.3 ~ 3.5) 2.5 (1.3 ~ 3.0) 2.8 (1.3 ~ 4.0) Capacity Btu/h 6,800 (4,400 ~ 8,900) 8,500 (4,400 ~ 11,900) 8,500 (4,400 ~ 10,200) 9,600 (4,400 ~ 13,600)
  • Page 23 SiBE041010EA Specifications 50 Hz, 230 V Indoor Unit ATX35J2V1B Model ARX35J3V1B Outdoor Unit Cooling Heating 3.3 (1.3 ~ 3.8) 3.5 (1.3 ~ 4.8) Capacity Btu/h 11,300 (4,400 ~ 13,000) 11,900 (4,400 ~ 16,400) Rated (Min. ~ Max.) kcal/h 2,840 (1,120 ~ 3,270) 3,010 (1,120 ~ 4,130) Running Current (Rated) Power Consumption...

  • Page 24: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiBE041010EA Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit.....................14 2. Outdoor Unit..................16 Printed Circuit Board Connector Wiring Diagram...

  • Page 25: Indoor Unit

    SiBE041010EA Indoor Unit 1. Indoor Unit Control PCB 1) S6 Connector for swing motor (horizontal blade) 2) S26 Connector for display PCB 3) S32 Connector for indoor heat exchanger thermistor 4) S200 Connector for fan motor 5) S403 Connector for adaptor PCB (option) 6) H1, H2, H3, FG Connector for terminal board 7) V1...
  • Page 26 Indoor Unit SiBE041010EA Display PCB 1) S27 Connector for control PCB 2) SW1 (S1W) Forced cooling operation [ON/OFF] button ∗ Refer to page 95 for detail. 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) RTH1 (R1T) Room temperature thermistor LED2 LED1...

  • Page 27: Outdoor Unit

    SiBE041010EA Outdoor Unit 2. Outdoor Unit Main PCB 1) S10 Connector for filter PCB 2) S20 Connector for electronic expansion valve coil 3) S40 Connector for overload protector 4) S70 Connector for fan motor 5) S80 Connector for four way valve coil 6) S90 Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe)
  • Page 28 Outdoor Unit SiBE041010EA Filter PCB 1) S11 Connector for main PCB 2) AC1, AC2, S Connector for terminal board 3) E1, E2 Terminal for earth wire 4) HL2, HN2 Connector for main PCB 5) HR1 Connector for reactor 6) FU3 Fuse (20 A, 250 V) 7) V2, V3 Varistor...

  • Page 29: Part 4 Function And Control

    SiBE041010EA Part 4 Function and Control 1. Main Functions..................19 1.1 Temperature Control ................19 1.2 Frequency Principle................19 1.3 Airflow Direction Control.................21 1.4 Fan Speed Control for Indoor Unit ............22 1.5 Program Dry Operation ................23 1.6 Automatic Operation................24 1.7 Thermostat Control.................25 1.8 NIGHT SET Mode ..................26 1.9 ECONO Operation .................26 1.10 Inverter POWERFUL Operation .............27 1.11 Clock Setting ..................27...

  • Page 30: Main Functions

    Main Functions SiBE041010EA 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor Target temperature: temperature determined by microcomputer Target temperature Room thermistor temperature...
  • Page 31 SiBE041010EA Main Functions Drawing of The following drawing shows a schematic view of the inverter principle: Inverter Refrigerant circulation rate (high) high speed Amount of heat Amount of heat exchanged air (large) exchanged air (large) high f low f Amount of heat Amount of heat exchanged air (small) exchanged air (small)

  • Page 32: Airflow Direction Control

    Main Functions SiBE041010EA Airflow Direction Control Power-Airflow The large flap sends a large volume of air downward to the floor and provides an optimum control in cooling, dry, and heating operation. Flap <Cooling / Dry> During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room.

  • Page 33: Fan Speed Control For Indoor Unit

    SiBE041010EA Main Functions Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.

  • Page 34: Program Dry Operation

    Main Functions SiBE041010EA Program Dry Operation Outline Program dry operation removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and [FAN] setting buttons are inoperable. Detail The microcomputer automatically sets the temperature and airflow rate. The difference between the room thermistor temperature at start-up and the target temperature is divided into two zones.

  • Page 35: Automatic Operation

    SiBE041010EA Main Functions Automatic Operation Outline Automatic Cooling / Heating Function When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.

  • Page 36: Thermostat Control

    Main Functions SiBE041010EA Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Detail Thermostat OFF Condition The temperature difference is in the zone A. Thermostat ON Condition The temperature difference returns to the zone C after being in the zone A. The system resumes from defrost control in any zones except A.

  • Page 37: Night Set Mode

    SiBE041010EA Main Functions NIGHT SET Mode Outline When the OFF TIMER is set, the NIGHT SET Mode is automatically activated. The NIGHT SET Mode keeps the airflow rate setting. Detail The NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.

  • Page 38: Inverter Powerful Operation

    Main Functions SiBE041010EA 1.10 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, operate the air conditioner by increasing the indoor fan rotating speed and the compressor frequency. Detail When the [POWERFUL] button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.

  • Page 39: Other Functions

    SiBE041010EA Main Functions 1.12 Other Functions 1.12.1 Hot-Start Function In order to prevent the cold air blast that normally comes when heating operation is started, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or made very weak thereby carrying out comfortable heating of the room.

  • Page 40: Function Of Thermistor

    Function of Thermistor SiBE041010EA 2. Function of Thermistor Electronic expansion valve Four way valve Compressor (R14247) (1) Outdoor Heat 1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe temperature. The system sets the target discharge pipe temperature according to the Exchanger outdoor and indoor heat exchanger temperature, and controls the electronic expansion valve Thermistor...

  • Page 41: Control Specification

    SiBE041010EA Control Specification 3. Control Specification Mode Hierarchy Outline The air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing. Detail Air conditioner control mode Forced operation mode Forced cooling operation (for pump down operation) Power transistor test mode Normal operation mode Cooling (includes drying)
  • Page 42 Control Specification SiBE041010EA 1. Determine command frequency Command frequency is determined in the following order of priority. 1. Limiting defrost control time 2. Forced cooling 3. Indoor frequency command 2. Determine upper limit frequency The minimum value is set as an upper limit frequency among the frequency upper limits of the following functions: Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze- up protection, defrost.

  • Page 43: Controls At Mode Changing / Start-Up

    SiBE041010EA Control Specification Controls at Mode Changing / Start-up 3.3.1 Preheating Control Outline The inverter operation in open phase starts with the conditions of the preheating command from the indoor unit, the outdoor temperature, and the discharge pipe temperature. Outdoor temperature ≥ A°C → Control I Detail Outdoor temperature <...

  • Page 44: Discharge Pipe Temperature Control

    Control Specification SiBE041010EA 3.3.4 3-minute Standby Turning on the compressor is prohibited for 3 minutes after turning it off. (Except when defrosting.) 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The function is not activated when defrosting.) (Hz) Frequency...

  • Page 45: Input Current Control

    SiBE041010EA Control Specification Input Current Control Outline The microcomputer calculates the input current while the compressor is running, and sets the frequency upper limit from the input current. In case of heat pump models, this control which is the upper limit control of the frequency takes priority over the lower limit of control of four way valve operation compensation.

  • Page 46: Freeze-Up Protection Control

    Control Specification SiBE041010EA Freeze-up Protection Control Outline During cooling operation, the signal sent from the indoor unit controls the operating frequency limitation and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) Detail The operating frequency limitation is judged with the indoor heat exchanger temperature.

  • Page 47: Outdoor Fan Control

    SiBE041010EA Control Specification Outdoor Fan Control 1. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF. 2. Fan OFF control during defrosting The outdoor fan is turned OFF during defrosting.

  • Page 48: Defrost Control

    Control Specification SiBE041010EA 3.10 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish defrosting. Detail Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature.

  • Page 49: Electronic Expansion Valve Control

    SiBE041010EA Control Specification 3.11 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2. Pressure equalizing control Open Control 1.

  • Page 50: Pressure Equalizing Control

    Control Specification SiBE041010EA 3.11.1 Fully Closing with Power ON The electronic expansion valve is initialized when turning on the power. The opening position is set and the pressure equalization is developed. 3.11.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens, and develops the pressure equalization.
  • Page 51 SiBE041010EA Control Specification 3.11.7 Control for Disconnection of the Discharge Pipe Thermistor Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensation temperature. If the discharge pipe thermistor is disconnected, the electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.

  • Page 52: Malfunctions

    Control Specification SiBE041010EA 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction may occur in the thermistor. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Outdoor temperature thermistor 3.12.2 Detection of Overcurrent and Overload Outline An excessive output current is detected and the OL temperature is observed to protect the compressor.

  • Page 53: Part 5 Remote Controller

    SiBE041010EA Part 5 Remote Controller 1. Remote Controller .................43 Remote Controller...

  • Page 54: Remote Controller

    Refer to the following pages for detail. 1 ECONO operation P.26 2 POWERFUL operation P.27 Note: Refer to the operation manual of applicable model for detail. You can download operation manuals from ‘DISTRIBUTOR’S PAGE’: DISTRIBUTOR’S PAGE → Product Information → Operation/Installation Manual (URL: http://global.daikin.com/Daikin/global/Distributors_admin/user_mng/login.php) Remote Controller...

  • Page 55: Mode Button

    5 Clock setting P.27 4 COMFORT AIRFLOW P.21, 22 operation Note: Refer to the operation manual of applicable model for detail. You can download operation manuals from ‘DISTRIBUTOR’S PAGE’: DISTRIBUTOR’S PAGE → Product Information → Operation/Installation Manual (URL: http://global.daikin.com/Daikin/global/Distributors_admin/user_mng/login.php) Remote Controller...

  • Page 56: Part 6 Service Diagnosis

    SiBE041010EA Part 6 Service Diagnosis 1. Troubleshooting with LED ..............46 1.1 Indoor Unit....................46 1.2 Outdoor Unit ...................46 2. Problem Symptoms and Measures ............47 3. Service Check Function ................48 4. Troubleshooting ..................51 4.1 Error Codes and Description ..............51 4.2 Indoor Unit PCB Abnormality ..............52 4.3 Freeze-up Protection Control or Heating Peak-cut Control....53 4.4 Fan Motor (DC Motor) or Related Abnormality........54 4.5 Thermistor or Related Abnormality (Indoor Unit)........56...

  • Page 57: Troubleshooting With Led

    SiBE041010EA Troubleshooting with LED 1. Troubleshooting with LED Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.

  • Page 58: Problem Symptoms And Measures

    Problem Symptoms and Measures SiBE041010EA 2. Problem Symptoms and Measures Symptom Check Item Details of Measure Reference Page The unit does not operate. Check the power supply. Check if the rated voltage is supplied. — Check the type of the indoor unit. Check if the indoor unit type is compatible with —...

  • Page 59: Service Check Function

    SiBE041010EA Service Check Function 3. Service Check Function 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature Check Method 1 display screen. Timer cancel button <ARC433 Series> (R18206) 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below.
  • Page 60 Service Check Function SiBE041010EA Check Method 2 1. Press the center of the [TEMP] button and the [MODE] button at the same time to enter the diagnosis mode. (R19114) The left-side number blinks. (R14967) 2. Press the [TEMP] button and change the number until you hear the two consecutive beeps or the long beep.
  • Page 61 SiBE041010EA Service Check Function 5. Press the [TEMP] button and change the number until you hear the long beep. (R19115) 6. Diagnose by the sound. beep : The left-side number does not correspond with the error code. two consecutive beeps : The left-side number corresponds with the error code but the right-side number does not.

  • Page 62: Troubleshooting

    Troubleshooting SiBE041010EA 4. Troubleshooting Error Codes and Description Reference Error Codes Description Page System Normal — Refrigerant shortage Low-voltage detection or over-voltage detection Signal transmission error (between indoor unit and outdoor unit) Unspecified voltage (between indoor unit and outdoor unit) Indoor Indoor unit PCB abnormality Unit...

  • Page 63: Indoor Unit Pcb Abnormality

    SiBE041010EA Troubleshooting Indoor Unit PCB Abnormality Error Code Method of Error The system checks if the circuit works properly within the microcomputer of the indoor unit. Detection Error Decision The system cannot set the internal settings. Conditions Supposed Wrong models interconnected Defective indoor unit PCB Causes Disconnection of connector...

  • Page 64: Freeze-Up Protection Control Or Heating Peak-Cut Control

    Troubleshooting SiBE041010EA Freeze-up Protection Control or Heating Peak-cut Control Error Code Method of Error Freeze-up protection control During cooling operation, the freeze-up protection control (operation halt) is activated Detection according to the temperature detected by the indoor heat exchanger thermistor. Heating peak-cut control During heating operation, the temperature detected by the indoor heat exchanger thermistor is used for the heating peak-cut control (operation halt, outdoor fan stop, etc.)

  • Page 65: Fan Motor (Dc Motor) Or Related Abnormality

    SiBE041010EA Troubleshooting Fan Motor (DC Motor) or Related Abnormality Error Code Method of Error The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Detection Error Decision The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
  • Page 66 Troubleshooting SiBE041010EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Note: The motor may break when the Check No.03 Turn off the power supply. motor connector is disconnected (Unplug the power cable or turn Refer to P.86 with the power supply on.

  • Page 67: Thermistor Or Related Abnormality (Indoor Unit)

    SiBE041010EA Troubleshooting Thermistor or Related Abnormality (Indoor Unit) C4 , C9 Error Code Method of Error The temperatures detected by the thermistors determine thermistor errors. Detection Error Decision The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Conditions Supposed Disconnection of connector...

  • Page 68: Refrigerant Shortage

    Troubleshooting SiBE041010EA Refrigerant Shortage Error Code Method of Error Refrigerant shortage detection I: Refrigerant shortage is detected by checking the input current value and the compressor Detection running frequency. If the refrigerant is short, the input current is lower than the normal value. Refrigerant shortage detection II: Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of the electronic expansion valve.
  • Page 69 SiBE041010EA Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.85 Any thermistor Replace the thermistor(s) disconnected? position. ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗...

  • Page 70: Low-Voltage Detection Or Over-Voltage Detection

    Troubleshooting SiBE041010EA Low-voltage Detection or Over-voltage Detection Error Code Method of Error Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. Detection Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit. Error Decision Low-voltage detection: Conditions...
  • Page 71 SiBE041010EA Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the connection of the compressor harness.

  • Page 72: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041010EA Signal Transmission Error (between Indoor Unit and Outdoor Unit) Error Code Method of Error The data received from the outdoor unit in signal transmission is checked whether it is normal. Detection Error Decision The data sent from the outdoor unit cannot be received normally, or the content of the data is Conditions abnormal.
  • Page 73 SiBE041010EA Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Refer to P.87 Check the power supply voltage. Is the Is the voltage fluctuation voltage fluctuation Correct the power supply.

  • Page 74: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041010EA Unspecified Voltage (between Indoor Unit and Outdoor Unit) Error Code Method of Error The supply power is detected for its requirements (different from pair type and multi type) by the indoor / outdoor transmission signal. Detection Error Decision The pair type and multi type are interconnected.

  • Page 75: Outdoor Unit Pcb Abnormality

    SiBE041010EA Troubleshooting 4.10 Outdoor Unit PCB Abnormality Error Code Method of Error The system checks if the microprocessor is working in order. The system checks if the zero-cross signal comes in properly. Detection Error Decision The microprocessor program runs out of control. The zero-cross signal is not detected.

  • Page 76: Ol Activation (Compressor Overload)

    Troubleshooting SiBE041010EA 4.11 OL Activation (Compressor Overload) Error Code Method of Error A compressor overload is detected through overload protector (OL). Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Conditions Supposed Disconnection of discharge pipe thermistor...
  • Page 77 SiBE041010EA Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.85 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.87 Check No.

  • Page 78: Compressor Lock

    Troubleshooting SiBE041010EA 4.12 Compressor Lock Error Code Method of Error A compressor lock is detected by checking the compressor running condition through the position detection circuit. Detection Error Decision Operation stops due to overcurrent. If the error repeats, the system is shut down. Conditions Reset condition: Continuous run for about 11 minutes without any other error Supposed...

  • Page 79: Dc Fan Lock

    SiBE041010EA Troubleshooting 4.13 DC Fan Lock Error Code Method of Error An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Detection Error Decision The fan does not start in about 15 ~ 60 seconds even when the fan motor is running. If the error repeats, the system is shut down.

  • Page 80: Input Overcurrent Detection

    Troubleshooting SiBE041010EA 4.14 Input Overcurrent Detection Error Code Method of Error An input overcurrent is detected by checking the input current value with the compressor running. Detection Error Decision The current exceeds about 14 A for 2.5 seconds with the compressor running. (The upper limit of the current decreases when the outdoor temperature exceeds a certain Conditions level.)

  • Page 81: Four Way Valve Abnormality

    SiBE041010EA Troubleshooting 4.15 Four Way Valve Abnormality Error Code Method of Error The room temperature thermistor and the indoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode. Detection Error Decision A following condition continues over 10 minutes after operating for 5 minutes. Cooling / Dry Conditions A –...
  • Page 82 Troubleshooting SiBE041010EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Four way valve coil Refer to P.85 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.88 Harness out of connector? Reconnect the harness.

  • Page 83: Discharge Pipe Temperature Control

    SiBE041010EA Troubleshooting 4.16 Discharge Pipe Temperature Control Error Code Method of Error An error is determined with the temperature detected by the discharge pipe thermistor. Detection Error Decision If the temperature detected by the discharge pipe thermistor rises above A°C, the compressor stops.

  • Page 84: High Pressure Control In Cooling

    Troubleshooting SiBE041010EA 4.17 High Pressure Control in Cooling Error Code Method of Error High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Detection Error Decision The temperature sensed by the outdoor heat exchanger thermistor rises above about 60°C.

  • Page 85: Compressor System Sensor Abnormality

    SiBE041010EA Troubleshooting 4.18 Compressor System Sensor Abnormality Error Code Method of Error The system checks the DC current before the compressor starts. Detection Error Decision The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output Conditions converted to voltage value) The DC voltage before compressor start-up is below 50 V.

  • Page 86: Position Sensor Abnormality

    Troubleshooting SiBE041010EA 4.19 Position Sensor Abnormality Error Code Method of Error A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes without any other error Conditions Supposed...
  • Page 87 SiBE041010EA Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Refer to P.89 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.91 Voltage as rated? Correct the power supply.

  • Page 88: Dc Voltage / Current Sensor Abnormality

    Troubleshooting SiBE041010EA 4.20 DC Voltage / Current Sensor Abnormality Error Code Method of Error DC voltage or DC current sensor abnormality is identified based on the compressor running frequency and the input current. Detection Error Decision The compressor running frequency is above 52 Hz. (The input current is also below 0.1 A.) Conditions If the error repeats, the system is shut down.

  • Page 89: Thermistor Or Related Abnormality (Outdoor Unit)

    SiBE041010EA Troubleshooting 4.21 Thermistor or Related Abnormality (Outdoor Unit) H9 , J3 , J6 , P4 Error Code Method of Error This fault is identified based on the thermistor input voltage to the microcomputer. A thermistor fault is identified based on the temperature sensed by each thermistor. Detection Error Decision The thermistor input voltage is above 4.96 V or below 0.04 V with the power on.
  • Page 90 Troubleshooting SiBE041010EA In case of “ H9 ” “ J3 ” “ J6 ” Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.85 Turn on the power again. Error displayed Reconnect the connectors again on remote...

  • Page 91: Electrical Box Temperature Rise

    SiBE041010EA Troubleshooting 4.22 Electrical Box Temperature Rise Error Code Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Detection Error Decision With the compressor off, the radiation fin temperature is above A°C. The error is cleared when the radiation fin temperature drops below B°C.

  • Page 92: Radiation Fin Temperature Rise

    Troubleshooting SiBE041010EA 4.23 Radiation Fin Temperature Rise Error Code Method of Error A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on. Detection Error Decision If the radiation fin temperature with the compressor on is above A°C. The error is cleared when the radiation fin temperature drops below B°C.
  • Page 93 SiBE041010EA Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.17 Turn off the power and turn it on Refer to P.91 again to start the system. Check No.19 Refer to P.92 Has the PCB been...

  • Page 94: Output Overcurrent Detection

    Troubleshooting SiBE041010EA 4.24 Output Overcurrent Detection Error Code Method of Error An output overcurrent is detected by checking the current that flows in the inverter DC section. Detection Error Decision A position signal error occurs while the compressor is running. A rotation speed error occurs while the compressor is running.
  • Page 95 SiBE041010EA Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output Refer to P.89 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 96: Check

    Check SiBE041010EA 5. Check Thermistor Resistance Check Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using tester. The data is for reference purpose only. Resistance (kΩ) Thermistor temperature (°C) Room temperature thermistor Other thermistors –20 73.4...

  • Page 97: Fan Motor Connector Output Check

    SiBE041010EA Check Fan Motor Connector Output Check Check No.03 Fan motor wire breakdown / short circuit check 1. Check the connector for connection. 2. Turn the power off. Ω Ω 3. Check if each resistance at the phases U - V and V - W is 90 ~ 100 (between the pins 12 - 9, and between 9 - 6).

  • Page 98: Power Supply Waveforms Check

    Check SiBE041010EA Power Supply Waveforms Check Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check the waveform disturbance. Check if the power supply waveform is a sine wave. (Fig.1) Check if there is waveform disturbance near the zero cross. (sections circled in Fig.2) Fig.1 Fig.2 (R1444)

  • Page 99: Four Way Valve Performance Check

    SiBE041010EA Check Four Way Valve Performance Check Check No.13 Turn off the power and turn it on again. ∗ Four way valve coil Start heating operation. Cooling / Dry : No continuity Heating : Continuity voltage at 120 - 220 Replace the outdoor unit VDC with compressor PCB.

  • Page 100: Inverter Analyzer Check

    Check SiBE041010EA Inverter Analyzer Check Check No.15 Characteristics Inverter analyzer: RSUK0917C If an abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some other failure (main PCB, power module, etc.).

  • Page 101: Rotation Pulse Check On The Outdoor Unit Pcb

    SiBE041010EA Check Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) If all the LEDs are lit uniformly, the compressor is defective. → Replace the compressor. (2) If the LEDs are not lit uniformly, check the power module. → Refer to Check No.22. (3) If NG in Check No.22, replace the power module.

  • Page 102: Installation Condition Check

    Check SiBE041010EA Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air Change the installation suction and location or direction. discharge area. Is the discharged air Change the installation short-circuited? location or direction. Is the outdoor heat Clean the outdoor heat exchanger very dirty? exchanger.

  • Page 103: Outdoor Fan System Check

    SiBE041010EA Check 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor lead wire connector Outdoor fan running? Reconnect the connector. disconnected? Go to Check No. 16. Outdoor fan system is functioning. (R15001) 5.12 Main Circuit Short Check Check No.20 Note: Make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approximately...

  • Page 104: Power Module Check

    Check SiBE041010EA 5.13 Power Module Check Check No.22 Note: Make sure that the voltage between (+) and (–) of the power module is approximately 0 V before checking. Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.

  • Page 105: Part 7 Tips For Servicing

    SiBE041010EA Part 7 Tips for Servicing 1. Tips for Servicing ..................95 1.1 Pump Down Operation ................95 1.2 Forced Cooling Operation ..............95 2. Trial Operation ..................96 3. Field Settings ..................97 3.1 When 2 Units are Installed in 1 Room............97 3.2 Jumper Settings ..................97 4.

  • Page 106: Tips For Servicing

    Tips for Servicing SiBE041010EA 1. Tips for Servicing Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing the unit. Detail 1) Remove the valve caps from the liquid stop valve and the gas stop valve. 2) Carry out forced cooling operation.

  • Page 107: Trial Operation

    SiBE041010EA Trial Operation 2. Trial Operation Outline 1. Measure the power supply voltage and make sure that it falls within the specified range. 2. Trial operation should be carried out in either cooling or heating operation. In cooling operation, select the lowest programmable temperature (18°C); in heating operation, select the highest programmable temperature (30°C).

  • Page 108: Field Settings

    Field Settings SiBE041010EA 3. Field Settings When 2 Units are Installed in 1 Room Outline When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding wireless remote controller can be set for different addresses. Both the indoor unit PCB and the wireless remote controller need alteration.

  • Page 109: Silicon Grease On Power Transistor / Diode Bridge

    SiBE041010EA Silicon Grease on Power Transistor / Diode Bridge 4. Silicon Grease on Power Transistor / Diode Bridge Outline Apply the specified silicon grease to the heat radiation part of a power transistor / diode bridge when you replace an outdoor unit PCB. The silicon grease encourages the heat radiation of a power transistor / diode bridge.

  • Page 110: Part 8 Appendix

    SiBE041010EA Part 8 Appendix 1. Piping Diagrams..................100 1.1 Indoor Unit....................100 1.2 Outdoor Unit ..................101 2. Wiring Diagrams..................102 2.1 Indoor Unit....................102 2.2 Outdoor Unit ..................102 3. Removal Procedure (Booklet No.) ............103 Appendix...

  • Page 111: Piping Diagrams

    SiBE041010EA Piping Diagrams 1. Piping Diagrams Indoor Unit FTX20/25/35JV1B, FTX20/25/35J2V1B, ATX20/25/35JV1B, ATX20/25/35J2V1B INDOOR UNIT HEAT EXCHANGER 7.0CuT 4.8CuT THERMISTOR 7.0CuT ON HEAT EXCH. 7.0CuT CROSS FLOW FAN FIELD PIPING ( 6.4CuT ) FAN MOTOR 9.5CuT FIELD PIPING ( 9.5CuT ) REFRIGERANT FLOW COOLING HEATING...

  • Page 112: Outdoor Unit

    Piping Diagrams SiBE041010EA Outdoor Unit RX20/25JV1B, RX20/25J3V1B, ARX20/25JV1B, ARX20/25J3V1B OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER THERMISTOR 7.0CuT 7.0CuT HEAT EXCHANGER THERMISTOR MOTOR OPERATED VALVE 7.0CuT 6.4CuT 6.4CuT MUFFLER WITH FILTER PROPELLER FAN 9.5CuT FOUR WAY VALVE FIELD PIPING ( 6.4CuT ) ON: HEATING LIQUID STOP DISCHARGE PIPE...

  • Page 113: Wiring Diagrams

    SiBE041010EA Wiring Diagrams 2. Wiring Diagrams Indoor Unit FTX20/25/35JV1B, FTX20/25/35J2V1B, ATX20/25/35JV1B, ATX20/25/35J2V1B PCB 2 PCB 1 FIELD WIRING. TRANSMISSION LED1 GRN/YLW CIRCUIT LED2 RECTIFIER OUTDOOR MR10 CAUTION t˚ 3.15A NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS IPM200 SIGNAL TURNED OFF AND THEN BACK...

  • Page 114: Removal Procedure (Booklet No.)

    Removal Procedure (Booklet No.) SiBE041010EA 3. Removal Procedure (Booklet No.) Refer to the following booklets for removal procedure. ∗FTX20/25/35JV1B, ATX20/25/35JV1B Refer to Si041051. ∗FTX20/25/35J2V1B, ATX20/25/35J2V1B Refer to Si041264. ∗RX20/25/35JV1B, ARX20/25/35JV1B Refer to Si001073. ∗RX20/25/35J3V1B, ARX20/25/35J3V1B Refer to Si001276. Appendix...

  • Page 115: Revision History

    Revision History Month / Year Version Revised contents 03 / 2010 SiBE041010 First edition Model addition: FTX20/25/35J2V1B, ATX20/25/35J2V1B, RX20/25/35J3V1B, 06 / 2013 SiBE041010EA ARX20/25/35J3V1B...
  • Page 116 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

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