Daikin FTX20K(2)V1B Service Manual
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Daikin FTX20K(2)V1B Service Manual

Inverter pair wall mounted type ftx/atx-k series
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Service
Manual
Inverter Pair
Wall Mounted Type FTX/ATX-K Series
SiBE041525F
[Applicable Models]
 Inverter Pair: Heat Pump
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Summary of Contents for Daikin FTX20K(2)V1B

  • Page 1 SiBE041525F Service Manual Inverter Pair Wall Mounted Type FTX/ATX-K Series [Applicable Models]  Inverter Pair: Heat Pump...
  • Page 2 SiBE041525F Inverter Pair Wall Mounted Type FTX/ATX-K Series Heat Pump Indoor Unit FTX20K(2)V1B FTX50K(M/2)V1B ATX20K(2)V1B FTX25K(2)V1B FTX60K(M/2)V1B ATX25K(2)V1B FTX35K(2)V1B FTX71K(M/2)V1B ATX35K(2)V1B Outdoor Unit RX20K2/5V1B RX50K(2)V1B ARX20K2V1B RX25K2/5V1B RX60K(2)V1B ARX25K2V1B RX35K2/5V1B RX71K(2)V1B ARX35K2V1B Table of Contents...
  • Page 3 SiBE041525F Version log Month / Year Version Revised contents 01 / 2016 SiBE041525E (A)RX20~35K2 02 / 2016 SiBE041525F Include RX71K & FTX71KM + standard S21 connection Table of Contents...

  • Page 4: Table Of Contents

    SiBE041525F 1. Safety Cautions..................vi 1.1 Warnings and Cautions Regarding Safety of Workers......vi 1.2 Warnings and Cautions Regarding Safety of Users......viii 2. Icons Used ....................x Part 1 - List of Functions..............1 1. Functions....................2 Part 2 - Specifications..............4 1.
  • Page 5 SiBE041525F Part 5 - Remote Controller ............40 1. Remote Controller .................41 Part 6 - Service Diagnosis ............43 1. General Problem Symptoms and Check Items ........44 2. Troubleshooting with LED ..............45 2.1 Indoor Unit....................45 2.2 Outdoor Unit ...................45 3. Service Diagnosis .................46 4.
  • Page 6 SiBE041525F Part 7 - Trial Operation and Field Settings ........90 1. Tips for Servicing ..................91 1.1 Pump Down Operation ................91 1.2 Forced Cooling Operation ..............91 2. Trial Operation ..................92 3. Field Settings ..................93 3.1 Temperature Display Switch ..............93 3.2 When 2 Units are installed in 1 Room ............93 4.

  • Page 7: Safety Cautions

    SiBE041525F Safety Cautions 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer.
  • Page 8 Safety Cautions SiBE041525F 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 9: Warnings And Cautions Regarding Safety Of Users

    SiBE041525F Safety Cautions Caution Conduct welding work in a well-ventilated place. Using a welder in an enclosed room may cause oxygen deficiency. 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).
  • Page 10 Safety Cautions SiBE041525F 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 refrigerant system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.

  • Page 11: Icons Used

    SiBE041525F Icons Used Caution Check the earth / grounding, and repair it if the equipment is not properly earthed / grounded. Improper earth / grounding may cause an electrical shock. Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 MΩ...

  • Page 12: Part 1 - List Of Functions

    SiBE041525F Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 13: Functions

    SiBE041525F Functions 1. Functions Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — —   Functions Cleanliness –10 –10 Operation limit for cooling (°CDB) Photocatalytic deodorizing filter — — ~ 46 ~ 46 Air-purifying filter with photocatalytic –...
  • Page 14 Functions SiBE041525F Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter —  Functions Cleanliness –10 Operation limit for cooling (°CDB) Photocatalytic deodorizing filter — ~ 46 Air-purifying filter with photocatalytic – Operation limit for heating (°CWB) —...

  • Page 15: Part 2 - Specifications

    SiBE041525F Part 2 Specifications 1. Specifications ..................5 Specifications...

  • Page 16: Specifications

    Specifications SiBE041525F 1. Specifications See corresponding databook Specifications...

  • Page 17: Part 3 - Printed Circuit Board Connector Wiring Diagram

    SiBE041525F Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................7 1.1 20/25/35 Class ..................7 1.2 50/60/71 Class ..................9 2. Outdoor Unit..................12 2.1 20/25/35 Class ..................12 2.2 50/60/71 class ..................13 Printed Circuit Board Connector Wiring Diagram...

  • Page 18: Indoor Unit

    Indoor Unit SiBE041525F 1. Indoor Unit 20/25/35 Class Control PCB (PCB1) 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 DC fan motor 5) H1, H2, H3, FG Connector for terminal board 6) FU1 Fuse (3.15 A, 250 V)
  • Page 19 SiBE041525F Indoor Unit Display PCB (PCB2) 1) S27 Connector for control PCB 2) SW1 (S1W) Forced cooling operation ON/OFF button * Refer to page 91 for details. 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) RTH1 (R1T) Room temperature thermistor LED2 LED1...

  • Page 20: 50/60/71 Class

    Indoor Unit SiBE041525F 50/60/71 Class Control PCB (PCB2) 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 DC fan motor 5) S900 Connector for filter PCB S200 S900 3P380931-1...
  • Page 21 SiBE041525F Indoor Unit Filter PCB (PCB1) 1) S100 Connector for terminal board 2) S800 Connector for control PCB 3) FG, HE Connector for ground 4) FU1 Fuse (3.15 A, 250 V) 5) V2 Varistor S800 S100 3P380932-1 Display PCB (PCB3) 1) S27 Connector for control PCB 2) SW1 (S1W)
  • Page 22 Indoor Unit SiBE041525F Remote Control PCB (BR069) S602 S601 To optional wired remote controller BRC073 and BRP069 To connector S403 of control PCB (PCB1) Printed Circuit Board Connector Wiring Diagram...

  • Page 23: Outdoor Unit

    SiBE041525F Outdoor Unit 2. Outdoor Unit 20/25/35 Class Main PCB (PCB1) 1) S20 Connector for electronic expansion valve coil 2) S30 Connector for compressor motor 3) S40 Connector for overload protector 4) S71 Connector for DC fan motor 5) S80 Connector for four way valve coil 6) S90 Connector for thermistors...

  • Page 24: 50/60/71 Class

    Outdoor Unit SiBE041525F 50/60/71 class Main PCB 1) S20 Connector for electronic expansion valve coil 2) S40 Connector for overload protector 3) S70 Connector for DC fan motor 4) S80 Connector for four way valve coil (heat pump model only) 5) S90 Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe)

  • Page 25: Part 4 - Functions And Control

    SiBE041525F Part 4 Functions and Control 1. Main Functions..................15 1.1 Temperature Control ................15 1.2 Frequency Principle................15 1.3 Airflow Direction Control.................17 1.4 Fan Speed Control for Indoor Unit ............18 1.5 Program Dry Operation ................19 1.6 Automatic Operation................20 1.7 Thermostat Control.................21 1.8 NIGHT SET Mode ..................22 1.9 ECONO Operation .................22 1.10 Inverter POWERFUL Operation .............23 1.11 Other Functions..................24...

  • Page 26: Main Functions

    Main Functions SiBE041525F 1. Main Functions Temperature Control The definitions of temperatures are classified as following. Definitions of 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 ...
  • Page 27 SiBE041525F Main Functions The following drawing shows a schematic view of the inverter principle: 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) low speed...

  • Page 28: Airflow Direction Control

    Main Functions SiBE041525F Airflow Direction Control The large flap sends a large volume of air downward to the floor and provides an optimum Power-Airflow 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 29: Fan Speed Control For Indoor Unit

    SiBE041525F Main Functions Fan Speed Control for Indoor Unit Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. Outline The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.

  • Page 30: Program Dry Operation

    Main Functions SiBE041525F Program Dry Operation Program dry operation removes humidity while preventing the room temperature from lowering. Outline Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting buttons are inoperable. The microcomputer automatically sets the temperature and airflow rate. The difference between Detail the room thermistor temperature at start-up and the target temperature is divided into two zones.

  • Page 31: Automatic Operation

    SiBE041525F 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 32: Thermostat Control

    Main Functions SiBE041525F Thermostat Control Thermostat control is based on the difference between the room thermistor temperature and the Outline target temperature. Detail Thermostat OFF Condition  The temperature difference is in the zone A. Thermostat ON Conditions  The temperature difference returns to the zone C after being in the zone A. ...

  • Page 33: Night Set Mode

    SiBE041525F Main Functions NIGHT SET Mode When the OFF TIMER is set, NIGHT SET Mode is automatically activated. NIGHT SET Mode Outline keeps the airflow rate setting. NIGHT SET Mode continues operation at the target temperature for the first one hour, then Detail automatically raises the target temperature slightly in cooling, or lowers it slightly in heating.

  • Page 34: Inverter Powerful Operation

    Main Functions SiBE041525F 1.10 Inverter POWERFUL Operation In order to exploit the cooling and heating capacity to full extent, the air conditioner can be Outline operated by increasing the indoor fan rotating speed and the compressor frequency. When the POWERFUL button is pressed, the fan speed and target temperature are converted Detail to the following states for 20 minutes.

  • Page 35: Other Functions

    SiBE041525F Main Functions 1.11 Other Functions 1.11.1 Hot-Start Function In order to prevent the cold air blast that normally occurs when heating operation is started, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or significantly weakened resulting in comfortable heating.

  • Page 36: Thermistor Functions

    Thermistor Functions SiBE041525F 2. Thermistor Functions Electronic expansion valve Four way valve Compressor (R14247) 1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe (1) Outdoor Heat 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 37: Control Specification

    SiBE041525F Control Specification 3. Control Specification Mode Hierarchy The air conditioner control has normal operation mode, forced operation mode, and power Outline 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 38: Frequency Control

    Control Specification SiBE041525F Frequency Control The compressor frequency is determined according to the difference between the room Outline thermistor temperature and the target temperature. When the shift of the frequency is less than zero (ΔF<0) by PI control, the target frequency is used as the command frequency. Dropping function Input current control, etc.
  • Page 39 SiBE041525F Control Specification When starting the compressor, the frequency is initialized according to the ∆D value of the Initial Frequency indoor unit. ∆D signal: Indoor Frequency Command The difference between the room thermistor temperature and the target temperature is taken as the ∆D value and is used for ∆D signal of frequency command.

  • Page 40: Controls At Mode Changing / Start-Up

    Control Specification SiBE041525F Controls at Mode Changing / Start-up 3.3.1 Preheating Control The inverter operation in open phase starts with the conditions of the outdoor temperature, the Outline discharge pipe temperature, the radiation fin temperature, and the preheating command from the indoor unit.

  • Page 41: Compressor Protection Function

    SiBE041525F Control Specification 3.3.3 Four Way Valve Operation Compensation At the beginning of operation as the four way valve is switched, the pressure difference to Outline activate the four way valve is acquired when the output frequency is higher than a certain fixed frequency, for a certain fixed time.

  • Page 42: Discharge Pipe Temperature Control

    Control Specification SiBE041525F Discharge Pipe Temperature Control The discharge pipe temperature is used as the internal temperature of the compressor. If the Outline discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep the discharge pipe temperature from rising further. Detail Stop zone A˚C...

  • Page 43: Input Current Control

    SiBE041525F Control Specification Input Current Control The microcomputer calculates the input current while the compressor is running, and sets the Outline frequency upper limit based on the input current. In case of heat pump models, this control is the upper limit control of frequency and takes priority over the lower limit control of four way valve operation compensation.

  • Page 44: Freeze-Up Protection Control

    Control Specification SiBE041525F Freeze-up Protection Control During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) The operating frequency limitation is judged with the indoor heat exchanger temperature. Indoor heat exchanger thermistor temperature 13˚C...

  • Page 45: Outdoor Fan Control

    SiBE041525F 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 46: Defrost Control

    Control Specification SiBE041525F 3.10 Defrost Control Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor Outline heat exchanger temperature must be more than a certain value to finish defrosting. Detail Conditions for Starting Defrost ...

  • Page 47: Electronic Expansion Valve Control

    SiBE041525F Control Specification 3.11 Electronic Expansion Valve Control The following items are included in the electronic expansion valve control. Outline 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 48: Pressure Equalizing Control

    Control Specification SiBE041525F 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 is equalized. 3.11.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens and the pressure is equalized.
  • Page 49 SiBE041525F Control Specification 3.11.7 Discharge Pipe Thermistor Disconnection Control The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe Outline 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 50: Malfunctions

    Control Specification SiBE041525F 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction can be detected in the following thermistors: 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 An excessive output current is detected and the OL temperature is observed to protect the Outline compressor.

  • Page 51: Part 5 - Remote Controller

    SiBE041525F Part 5 Remote Controller 1. Remote Controller .................41 Remote Controller...

  • Page 52: Remote Controller

    1 Automatic operation P.20 Refer to the operation manual of applicable model for details. You can download operation Note: manuals from Daikin Business Portal: Daikin Business Portal → Document Search → Item Category → Installation/Operation Manual (URL: https://global1d.daikin.com/business_portal/login/) Remote Controller...
  • Page 53 P.23 5 Auto-swing P.17 Refer to the operation manual of applicable model for details. You can download operation Note: manuals from Daikin Business Portal: Daikin Business Portal → Document Search → Item Category → Installation/Operation Manual (URL: https://global1d.daikin.com/business_portal/login/) Remote Controller...

  • Page 54: Part 6 - Service Diagnosis

    SiBE041525F Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items ........44 2. Troubleshooting with LED ..............45 2.1 Indoor Unit....................45 2.2 Outdoor Unit ...................45 3. Service Diagnosis .................46 4. Troubleshooting ..................49 4.1 Error Codes and Descriptions ..............49 4.2 Indoor Unit PCB Abnormality ..............50 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......51 4.4 Fan Motor (DC Motor) or Related Abnormality........52 4.5 Thermistor or Related Abnormality (Indoor Unit)........54...

  • Page 55: General Problem Symptoms And Check Items

    SiBE041525F General Problem Symptoms and Check Items 1. General Problem Symptoms and Check Items Symptom Check Item Measures 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 56: Troubleshooting With Led

    Troubleshooting with LED SiBE041525F 2. Troubleshooting with LED Indoor Unit The operation lamp blinks when any of the following errors is detected. Operation Lamp 1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.

  • Page 57: Service Diagnosis

    SiBE041525F Service Diagnosis 3. Service Diagnosis 1. When the TIMER CANCEL button is held down for 5 seconds, 00 is displayed on the Method 1 temperature display screen. TIMER CANCEL button (R21665) 2. Press the TIMER CANCEL button repeatedly until a long beep sounds. ...
  • Page 58 Service Diagnosis SiBE041525F Method 2 1. Press the center of the TEMP button and the OFF button at the same time. (R21666) 5C is displayed on the LCD. (R21059) 2. Select 5C (service check) with the TEMP or TEMP button. 3.
  • Page 59 SiBE041525F Service Diagnosis 5. 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. long beep: Both the left-side and right-side numbers correspond with the error code. (The numbers indicated when you hear the long beep are the error code.

  • Page 60: Troubleshooting

    Troubleshooting SiBE041525F 4. Troubleshooting Error Codes and Descriptions Reference Error Codes Description Page System Normal — 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 Freeze-up protection control / heating peak-cut control Fan motor (DC motor) or related abnormality...

  • Page 61: Indoor Unit Pcb Abnormality

    SiBE041525F Troubleshooting Indoor Unit PCB Abnormality Error Code The system checks if the circuit works properly within the microcomputer of the indoor unit. Method of Error Detection The system cannot set the internal settings. Error Decision Conditions  Wrong models interconnected Supposed ...

  • Page 62: Freeze-Up Protection Control / Heating Peak-Cut Control

    Troubleshooting SiBE041525F Freeze-up Protection Control / Heating Peak-cut Control Error Code  Freeze-up protection control Method of Error During cooling operation, the freeze-up protection control (operation halt) is activated Detection according to the temperature detected by the indoor heat exchanger thermistor. ...

  • Page 63: Fan Motor (Dc Motor) Or Related Abnormality

    SiBE041525F Troubleshooting Fan Motor (DC Motor) or Related Abnormality Error Code The rotation speed detected by the Hall IC during fan motor operation is used to determine Method of Error abnormal fan motor operation. Detection The detected rotation speed does not reach the demanded rotation speed of the target tap, and Error Decision is less than 50% of the maximum fan motor rotation speed.
  • Page 64 Troubleshooting SiBE041525F 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 Turn off the power supply. motor connector is disconnected Check No.03 (Unplug the power cable or turn with the power supply on.

  • Page 65: Thermistor Or Related Abnormality (Indoor Unit)

    SiBE041525F Troubleshooting Thermistor or Related Abnormality (Indoor Unit) C4, C9 Error Code The temperatures detected by the thermistors determine thermistor errors. Method of Error Detection The voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less Error Decision during compressor operation.

  • Page 66: Low-Voltage Detection Or Over-Voltage Detection

    Troubleshooting SiBE041525F 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: ...
  • Page 67 SiBE041525F 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 68: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041525F Signal Transmission Error (Between Indoor Unit and Outdoor Unit) Error Code The data received from the outdoor unit in signal transmission is checked whether it is normal. Method of Error Detection The data sent from the outdoor unit cannot be received normally, or the content of the data is Error Decision abnormal.
  • Page 69 SiBE041525F Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Check the power supply voltage. Refer to P.81 Is the Is the voltage fluctuation voltage fluctuation Correct the power supply.

  • Page 70: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041525F Unspecified Voltage (Between Indoor Unit and Outdoor Unit) Error Code The supply power is detected for its requirements (pair type is different from multi type) by the Method of Error indoor / outdoor transmission signal. Detection The pair type and multi type are interconnected. Error Decision Conditions ...

  • Page 71: Outdoor Unit Pcb Abnormality

    SiBE041525F Troubleshooting Outdoor Unit PCB Abnormality Error Code  The system checks if the microprocessor is working in order. Method of Error  The system checks if the zero-cross signal comes in properly. Detection  The microprocessor program runs out of control. Error Decision ...

  • Page 72: Ol Activation (Compressor Overload)

    Troubleshooting SiBE041525F 4.10 OL Activation (Compressor Overload) Error Code A compressor overload is detected through compressor OL. Method of Error Detection  If the error repeats, the system is shut down. Error Decision  Reset condition: Continuous run for about 60 minutes without any other error Conditions ...
  • Page 73 SiBE041525F 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.79 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.81 Check No.

  • Page 74: Compressor Lock

    Troubleshooting SiBE041525F 4.11 Compressor Lock Error Code A compressor lock is detected by the current waveform generated when applying high- Method of Error frequency voltage to the motor. Detection  If the error repeats, the system is shut down. Error Decision ...

  • Page 75: Dc Fan Lock

    SiBE041525F Troubleshooting 4.12 DC Fan Lock Error Code An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Method of Error Detection  The fan does not start in 15 ~ 30 seconds (depending on the model) even when the fan Error Decision motor is running.

  • Page 76: Input Overcurrent Detection

    Troubleshooting SiBE041525F 4.13 Input Overcurrent Detection Error Code An input overcurrent is detected by checking the input current value with the compressor Method of Error running. Detection The current exceeds about 14 ~ 18 A (depending on the model and operation mode) for 2.5 Error Decision seconds with the compressor running.

  • Page 77: Four Way Valve Abnormality

    SiBE041525F Troubleshooting 4.14 Four Way Valve Abnormality Error Code The room temperature thermistor and the indoor heat exchanger thermistor are checked if they Method of Error function within their normal ranges in each operation mode. Detection A following condition continues over 10 minute after operating for 5 minutes. Error Decision Conditions Cooling / Dry...
  • Page 78 Troubleshooting SiBE041525F 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.79 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.82 Harness disconnected? Reconnect the harness.

  • Page 79: Discharge Pipe Temperature Control

    SiBE041525F Troubleshooting 4.15 Discharge Pipe Temperature Control Error Code An error is determined with the temperature detected by the discharge pipe thermistor. Method of Error Detection  If the temperature detected by the discharge pipe thermistor rises above A°C, the Error Decision compressor stops.

  • Page 80: High Pressure Control In Cooling

    Troubleshooting SiBE041525F 4.16 High Pressure Control in Cooling Error Code High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if Method of Error the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Detection  The temperature sensed by the outdoor heat exchanger thermistor rise above 61°C Error Decision (depending on the model).

  • Page 81: Compressor System Sensor Abnormality

    SiBE041525F Troubleshooting 4.17 Compressor System Sensor Abnormality Error Code The system checks the DC current before the compressor starts. Method of Error Detection  The voltage converted from the DC current before compressor start-up is out of the range Error Decision 0.5 ~ 4.5 V.

  • Page 82: Position Sensor Abnormality

    Troubleshooting SiBE041525F 4.18 Position Sensor Abnormality Error Code A compressor start-up failure is detected by checking the compressor running condition through Method of Error the position detection circuit. Detection  If the error repeats, the system is shut down. Error Decision ...
  • Page 83 SiBE041525F 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.83 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.86 Is the power supply Check No.20...

  • Page 84: Thermistor Or Related Abnormality (Outdoor Unit)

    Troubleshooting SiBE041525F 4.19 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, P4 Error Code This fault is identified based on the thermistor input voltage to the microcomputer. Method of Error A thermistor fault is identified based on the temperature sensed by each thermistor. Detection ...
  • Page 85 SiBE041525F Troubleshooting 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.79 Turn on the power again. Error displayed Reconnect the connectors again on remote or thermistors.

  • Page 86: Electrical Box Temperature Rise

    Troubleshooting SiBE041525F 4.20 Electrical Box Temperature Rise Error Code An electrical box temperature rise is detected by checking the radiation fin thermistor with the Method of Error compressor off. Detection  With the compressor off, the radiation fin temperature is above A°C. Error Decision ...

  • Page 87: Radiation Fin Temperature Rise

    SiBE041525F Troubleshooting 4.21 Radiation Fin Temperature Rise Error Code A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Method of Error compressor on. Detection  If the radiation fin temperature with the compressor on is above A°C. Error Decision ...

  • Page 88: Output Overcurrent Detection

    Troubleshooting SiBE041525F 4.22 Output Overcurrent Detection Error Code An output overcurrent is detected by checking the current that flows in the inverter DC section. Method of Error Detection  A position signal error occurs while the compressor is running. Error Decision ...
  • Page 89 SiBE041525F 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.83 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 90: Check

    Check SiBE041525F 5. Check Thermistor Resistance Check Disconnect the connectors of the thermistors from the PCB, and measure the resistance of Check No.01 each thermistor using a multimeter. The data is for reference purpose only. Resistance (kΩ) Thermistor temperature (°C) Room temperature thermistor Other thermistors –20...

  • Page 91: Indoor Fan Motor Connector Output Check

    SiBE041525F Check Indoor Fan Motor Connector Output Check  Fan motor wire breakdown / short circuit check Check No.03 1. Check the connector for connection. 2. Turn the power off. 3. Check if each resistance at the phases U - V and V - W is 90 Ω ~ 100 Ω (between the pins 12 - 9, and between 9 - 6).

  • Page 92: Power Supply Waveforms Check

    Check SiBE041525F Power Supply Waveforms Check Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check Check No.11 the waveform disturbance.  Check if the power supply waveform is a sine wave (Fig.1). ...

  • Page 93: Four Way Valve Performance Check

    SiBE041525F Check Four Way Valve Performance Check Check No.13 Turn off the power. Then, turn on the power to restart the system. ∗ Four way valve coil Start heating operation. Cooling / Dry: Not energized Heating: Energized voltage at 220 - 240 Replace the outdoor unit VAC with compressor PCB (main PCB).

  • Page 94: Inverter Analyzer Check

    Check SiBE041525F Inverter Analyzer Check  Characteristics Check No.15 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 95 SiBE041525F Check Step 3 Activate power transistor test operation from the indoor unit. (1) Turn the power on. (2) Press the center of the TEMP button and the OFF button on the remote controller at the same time. (3) Select T with the TEMP or TEMP button.

  • Page 96: Rotation Pulse Check On The Outdoor Unit Pcb

    Check SiBE041525F Rotation Pulse Check on the Outdoor Unit PCB Make sure that the voltage of 320 + 100 V ~ 320 - 50 V is applied. Check No.16 1. Set operation off and power off. Disconnect the connector S70 or S71. 2.

  • Page 97: Installation Condition Check

    SiBE041525F Check 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 98: Outdoor Fan System Check

    Check SiBE041525F 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor Is the lead wire connector outdoor fan running? Go to Check No. 16. disconnected? Reconnect the connector. Outdoor fan system is functioning. (R21195) 5.12 Main Circuit Short Check Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is about 0 V...

  • Page 99: Power Module Check

    SiBE041525F Check 50/60/71 class Multimeter (R20701) 5.13 Power Module Check Check to make sure that the voltage between (+) and (–) of the power module is about 0 V Check No.22 before checking.  Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.
  • Page 100 Check SiBE041525F 20/25/35 class Pin 24: + Pin 23: U Pin 22: V Pin 21: W Pin 20: – (R20703) 50/60/71 class DC_P1: + (R20704) DC_N1: – Service Diagnosis...

  • Page 101: Part 7 - Trial Operation And Field Settings

    SiBE041525F Part 7 Trial Operation and Field Settings 1. Tips for Servicing ..................91 1.1 Pump Down Operation ................91 1.2 Forced Cooling Operation ..............91 2. Trial Operation ..................92 3. Field Settings ..................93 3.1 Temperature Display Switch ..............93 3.2 When 2 Units are installed in 1 Room ............93 4.

  • Page 102: Tips For Servicing

    Tips for Servicing SiBE041525F 1. Tips for Servicing Pump Down Operation In order to protect the environment, be sure to conduct pump down operation when relocating or Outline disposing of the unit. 1) Remove the valve caps from the liquid stop valve and the gas stop valve. Detail 2) Carry out forced cooling operation.

  • Page 103: Trial Operation

    SiBE041525F Trial Operation 2. Trial Operation Carry out the trial operation in accordance with the operation manual to ensure that all functions Outline and parts, such as flap movement, are working properly. Trial operation should be carried out in either cooling or heating operation. 1.

  • Page 104: Field Settings

    Field Settings SiBE041525F 3. Field Settings Temperature Display Switch  You can select Celsius or Fahrenheit for temperature display. ARC466A6  Press the TEMP  and ON TIMER buttons at the same time for 5 seconds to change the unit of temperature display.

  • Page 105: Silicone Grease On Power Transistor / Diode Bridge

    SiBE041525F Silicone Grease on Power Transistor / Diode Bridge 4. Silicone Grease on Power Transistor / Diode Bridge Apply the specified silicone grease to the heat radiation part of a power transistor / diode bridge Outline when you replace an outdoor unit PCB. The silicone grease encourages the heat radiation of a power transistor / diode bridge.

  • Page 106: Part 8 - Appendix

    SiBE041525F Part 8 Appendix 1. Piping Diagrams..................96 1.1 Indoor Unit....................96 1.2 Outdoor Unit ...................97 2. Wiring Diagrams..................99 2.1 Indoor Unit....................99 2.2 Outdoor Unit ..................101 Appendix...

  • Page 107: Piping Diagrams

    SiBE041525F Piping Diagrams 1. Piping Diagrams Indoor Unit FTX20/25/35K(2)V1B, ATX20/25/35K(2)V1B Indoor unit Heat exchanger 6.4 CuT Crossflow fan Fan motor Field piping Thermistor (heat exchanger) 6.4 CuT Field piping 9.5 CuT 9.5 CuT Refrigerant flow Cooling Heating 4D0094181 FTX50/60/71K(M/2)V1B Indoor unit 6.4 CuT Distributor Heat exchanger...

  • Page 108: Outdoor Unit

    Piping Diagrams SiBE041525F Outdoor Unit RX20/25K2/5V1B, ARX20/25K2V1B Outdoor unit Refrigerant flow Heat exchanger 7.0 CuT Outdoor air temperature thermistor COOLING HEATING 7.0 CuT Heat exchanger thermistor Motor-operated valve 7.0 CuT 6.4 CuT 6.4 CuT Muffler with filter Propeller fan 9.5 CuT Muffler with filter 4-way valve ON: heating...
  • Page 109 SiBE041525F Piping Diagrams RX50K(2)V1B Outdoor unit Refrigerant flow Cooling Heat exchanger Outdoor temperature Heating Thermistor 7.0 CuT Heat exchanger thermistor 7.0 CuT 7.0 CuT Capillary tube 1 4.0 CuT 7.0 CuT 6.4 CuT 6.4 CuT Capillary tube 2 Muffler with filter 4.0 CuT Electronic expansion valve Filter...

  • Page 110: Wiring Diagrams

    Wiring Diagrams SiBE041525F 2. Wiring Diagrams Indoor Unit FTX20/25/35K(2)V1B, ATX20/25/35K(2)V1B PCB1: Control PCB Note: PCB2: Display PCB Refer to Part 3 for Printed Circuit Board Connector Wiring Diagram. PCB3: Remote Control PCB BR069 (only available on A/FTX20~35K2V1B) Appendix...
  • Page 111 SiBE041525F Wiring Diagrams FTX50/60/71K(M/2)V1B PCB A1P: Filter PCB Note: PCB A2P: Control PCB PCB A3P: Display PCB Refer to Part 3 for Printed Circuit Board Connector Wiring Diagram. PCB A4P: Remote Control PCB BR069 (only available on FTX50~71KM) Appendix...

  • Page 112: Outdoor Unit

    Wiring Diagrams SiBE041525F Outdoor Unit RX20/25/35K2/5V1B, ARX20/25/35K2V1B Field wiring Indoor IPM1 MRM10 C400 C405 MR30 3.15A V150 3.15A PCB1 MRCW Outdoor t˚ t˚ t˚ FU1, FU2, FU3 :Fuse :Coil :Reactor R1T R2T R3T HL1, HN1, E1, E2, HR1, HR2, S :Connection Outdoor Condenser...
  • Page 113 SiBE041525F Wiring Diagrams RX50/60/71K(2)V1B WIRING DIAGRAM FIELD WIRING INDOOR MRM20 IPM1 TO INDOOR UNIT 1 BLK MRM10 3.15A MR30 3.15A W V U POWER SUPPLY MRCW X11A OUTDOOR NOTE 1. REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. : CAPACITOR t˚...
  • Page 114 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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