Daikin FTXS20K2V1B Service Manual
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Daikin FTXS20K2V1B Service Manual

Inverter pair wall mounted type ftxs/atxs-k series
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See also: Service Manual , Operating Manual
Service
Manual
Inverter Pair
Wall Mounted Type FTXS/ATXS-K Series
SiBE041134EB
[Applicable Models]
Inverter Pair: Heat Pump

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Summary of Contents for Daikin FTXS20K2V1B

  • Page 1 SiBE041134EB Service Manual Inverter Pair Wall Mounted Type FTXS/ATXS-K Series [Applicable Models] Inverter Pair: Heat Pump...
  • Page 2 SiBE041134EB Inverter Pair Wall Mounted Type FTXS/ATXS-K Series Heat Pump Indoor Unit FTXS20K2V1B FTXS20K3V1B ATXS25K2V1B ATXS25K3V1B FTXS25K2V1B FTXS25K3V1B Outdoor Unit RXS20K2V1B RXS20L3V1B ARXS25L2V1B ARXS25L3V1B RXS25K2V1B RXS25L3V1B RXS20K3V1B RXS25K3V1B RXS20L2V1B RXS25L2V1B Table of Contents...

  • Page 3: Table Of Contents

    SiBE041134EB 1. Safety Cautions..................v 1.1 Warnings and Cautions Regarding Safety of Workers ......v 1.2 Warnings and Cautions Regarding Safety of Users ....... vii 2. Icons Used ..................... ix Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............5 1.
  • Page 4 SiBE041134EB Part 5 Remote Controller ............51 1. Remote Controller .................52 Part 6 Service Diagnosis............. 54 1. General Problem Symptoms and Check Items ........55 2. Troubleshooting with LED ..............56 2.1 Indoor Unit....................56 2.2 Outdoor Unit ...................56 3. Service Diagnosis .................57 4.
  • Page 5 SiBE041134EB Part 7 Trial Operation and Field Settings......... 105 1. Pump Down Operation................106 2. Forced Cooling Operation ..............107 3. Trial Operation ..................108 4. Field Settings ..................109 4.1 Model Type Setting ................109 4.2 When 2 Units are installed in 1 Room ..........109 4.3 Standby Electricity Saving..............110 4.4 Facility Setting (Cooling at Low Outdoor Temperature) .......110 4.5 Jumper Settings ...................111...

  • Page 6: Safety Cautions

    Safety Cautions SiBE041134EB 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 7 SiBE041134EB 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 8: Warnings And Cautions Regarding Safety Of Users

    Safety Cautions SiBE041134EB 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 9 SiBE041134EB Safety Cautions 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 10: Icons Used

    Icons Used SiBE041134EB 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 11: Part 1 List Of Functions

    SiBE041134EB Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 12: Functions

    Functions SiBE041134EB 1. Functions Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — Functions Cleanliness –10 Operation limit for cooling (°CDB) ~ 46 Photocatalytic deodorizing filter — Air-purifying filter with photocatalytic – Operation limit for heating (°CWB) —...
  • Page 13 SiBE041134EB Functions Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — Functions Cleanliness –10 Operation limit for cooling (°CDB) ~ 46 Photocatalytic deodorizing filter — Air-purifying filter with photocatalytic – Operation limit for heating (°CWB) —...
  • Page 14 Functions SiBE041134EB Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — — Functions Cleanliness –10 –10 Operation limit for cooling (°CDB) ~ 46 ~ 46 Photocatalytic deodorizing filter — — Air-purifying filter with photocatalytic –...

  • Page 15: Part 2 Specifications

    SiBE041134EB Part 2 Specifications 1. Specifications ..................6 Specifications...

  • Page 16: Specifications

    Specifications SiBE041134EB 1. Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXS20K2V1B FTXS25K2V1B Model RXS20K2V1B RXS25K2V1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.8) 2.5 (1.3 ~ 4.3) 2.5 (1.3 ~ 3.2) 2.8 (1.3 ~ 4.7) Capacity Rated (Min.
  • Page 17 SiBE041134EB Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXS20K2V1B FTXS25K2V1B Model RXS20K3V1B RXS25K3V1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.8) 2.5 (1.3 ~ 4.3) 2.5 (1.3 ~ 3.2) 2.8 (1.3 ~ 4.7) Capacity Rated...
  • Page 18 Specifications SiBE041134EB 50 Hz, 220 - 230 - 240 V Indoor Unit FTXS20K2V1B FTXS25K2V1B Model RXS20L2V1B RXS25L2V1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.8) 2.5 (1.3 ~ 4.3) 2.5 (1.3 ~ 3.2) 2.8 (1.3 ~ 4.7) Capacity Rated...
  • Page 19 SiBE041134EB Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXS20K3V1B FTXS25K3V1B Model RXS20L3V1B RXS25L3V1B Outdoor Unit Cooling Heating Cooling Heating 2.5 (1.3 ~ 4.3) 2.8 (1.3 ~ 4.7) Capacity Rated Btu/h 6,800 (4,400 ~ 9,600) 8,500 (4,400 ~ 14,700) 8,500 (4,400 ~ 10,900) 9,600 (4,400 ~ 16,000) (Min.
  • Page 20 Specifications SiBE041134EB 50 Hz, 220 - 230 - 240 V Indoor Unit ATXS25K2V1B ATXS25K3V1B Model ARXS25L2V1B ARXS25L3V1B Outdoor Unit Cooling Heating Cooling Heating 2.5 (1.3 ~ 3.2) 2.8 (1.3 ~ 4.7) 2.8 (1.3 ~ 4.7) Capacity Rated Btu/h 8,500 (4,400 ~ 10,900) 9,600 (4,400 ~ 16,000) 8,500 (4,400 ~ 10,900) 9,600 (4,400 ~ 16,000)

  • Page 21: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiBE041134EB Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit.....................12 2. Outdoor Unit ..................14 2.1 RXS20/25K2V1B, RXS20/25K3V1B, RXS20/25L2V1B, ARXS25L2V1B..................14 2.2 RXS20/25L3V1B, ARXS25L3V1B............16 Printed Circuit Board Connector Wiring Diagram...

  • Page 22: Indoor Unit

    Indoor Unit SiBE041134EB 1. Indoor Unit Control PCB (PCB1) 1) S6 Connector for swing motor (horizontal blade) 2) S25 Connector for INTELLIGENT EYE sensor PCB 3) S26 Connector for display PCB 4) S32 Connector for indoor heat exchanger thermistor 5) S200 Connector for DC fan motor 6) S403 Connector for adaptor PCB (option)
  • Page 23 SiBE041134EB Indoor Unit Display PCB (PCB2) 1) S27 Connector for control PCB 2) SW1 (S1W) Forced cooling operation ON/OFF button ∗ Refer to page 107 for detail. 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) LED3 (H3P) LED for INTELLIGENT EYE (green) 6) RTH1 (R1T)

  • Page 24: Outdoor Unit

    Outdoor Unit SiBE041134EB 2. Outdoor Unit RXS20/25K2V1B, RXS20/25K3V1B, RXS20/25L2V1B, ARXS25L2V1B Main PCB (PCB 2) 1) S10 Connector for filter PCB 2) S20 Connector for electronic expansion valve coil 3) S40 Connector for overload protector 4) S50 Connector for magnetic relay 5) S70 Connector for fan motor 6) S80...
  • Page 25 SiBE041134EB Outdoor Unit Filter PCB (PCB1) 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) FU1 Fuse (3.15 A, 250 V) 7) FU3 Fuse (20 A, 250 V)

  • Page 26: Rxs20/25L3V1B, Arxs25L3V1B

    Outdoor Unit SiBE041134EB RXS20/25L3V1B, ARXS25L3V1B Main PCB (PCB 1) 1) S20 Connector for electronic expansion valve coil 2) S30 Connector for compressor motor 3) S40 Connector for overload protector 4) S50 Connector for magnetic relay 5) S71 Connector for DC fan motor 6) S80 Connector for four way valve coil 7) S90...

  • Page 27: Part 4 Functions And Control

    SiBE041134EB Part 4 Functions and Control 1. Main Functions..................18 1.1 Temperature Control ................18 1.2 Frequency Principle................18 1.3 Airflow Direction Control.................20 1.4 Fan Speed Control for Indoor Unit ............21 1.5 Program Dry Operation ................22 1.6 Automatic Operation................23 1.7 Thermostat Control.................24 1.8 NIGHT SET Mode ..................25 1.9 ECONO Operation .................25 1.10 INTELLIGENT EYE Operation ...............26 1.11 Inverter POWERFUL Operation .............27...

  • Page 28: Main Functions

    Main Functions SiBE041134EB 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 29 SiBE041134EB 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 30: Airflow Direction Control

    Main Functions SiBE041134EB 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 31: Fan Speed Control For Indoor Unit

    SiBE041134EB 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 32: Program Dry Operation

    Main Functions SiBE041134EB 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 33: Automatic Operation

    SiBE041134EB 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 34: Thermostat Control

    Main Functions SiBE041134EB 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 Conditions 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 35: Night Set Mode

    SiBE041134EB Main Functions NIGHT SET Mode Outline When the OFF TIMER is set, NIGHT SET Mode is automatically activated. NIGHT SET Mode keeps the airflow rate setting. Detail NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in cooling, or lowers it slightly in heating.

  • Page 36: Intelligent Eye Operation

    Main Functions SiBE041134EB 1.10 INTELLIGENT EYE Operation Outline This function detects the presence of humans in the room with a motion sensor (INTELLIGENT EYE) and reduces the capacity when there is nobody in the room in order to save electricity. Detail 1.

  • Page 37: Inverter Powerful Operation

    SiBE041134EB Main Functions 1.11 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, the air conditioner can be operated 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 38: Clock Setting

    Main Functions SiBE041134EB 1.12 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press the Clock button. → is displayed and MON and blink. 2. Press the Select or Select button to set the clock to the current day of the week. 3.

  • Page 39: Weekly Timer Operation

    SiBE041134EB Main Functions 1.13 WEEKLY TIMER Operation Outline Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total). The 3 items: ON/OFF, temperature, and time can be set. Detail Setting example of the WEEKLY TIMER The same timer settings are made for the week from Monday through Friday while different timer settings are made for the weekend.
  • Page 40 Main Functions SiBE041134EB To use WEEKLY TIMER operation Setting mode • Make sure the day of the week and time are set. If not, set the day of the week and time. Program 1 Program 2 Program 3 Program 4 [Monday] 25˚C 27˚C...
  • Page 41 SiBE041134EB Main Functions Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10 minute intervals. • To return to the ON/OFF TIMER mode setting, press • Go to step when setting the OFF TIMER. Press •...
  • Page 42 Main Functions SiBE041134EB Copy mode • A reservation made once can be copied to another day of the week. The whole reservation of the selected day of the week will be copied. Program 1 Program 2 Program 3 Program 4 [Monday] 25˚C 27˚C...
  • Page 43 SiBE041134EB Main Functions Confirming a reservation • The reservation can be confirmed. Setting Displays Normal Confirmation Press w . • The day of the week and the reservation number of the current day will be displayed. Press to select the day of the week and the reservation number to be confirmed.
  • Page 44 Main Functions SiBE041134EB To delete reservations The individual reservation Press • The day of the week and the reservation number will be displayed. Press to select the day of the week and the reservation number to be deleted. Press • “ ”...

  • Page 45: Other Functions

    SiBE041134EB Main Functions 1.14 Other Functions 1.14.1 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 46: Thermistor Functions

    Thermistor Functions SiBE041134EB 2. Thermistor Functions 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 47: Control Specification

    SiBE041134EB 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 48: Frequency Control

    Control Specification SiBE041134EB Frequency Control Outline The compressor frequency is determined according to the difference between the room thermistor temperature and the target temperature. When the shift of the frequency is less than zero (∆F<0) by PI control, the target frequency is used as the command frequency. Dropping function Input current control, etc.
  • Page 49 SiBE041134EB 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 50: Controls At Mode Changing / Start-Up

    Control Specification SiBE041134EB Controls at Mode Changing / Start-up 3.3.1 Preheating Control Outline The inverter operation in open phase starts with the conditions of the outdoor temperature, the discharge pipe temperature, the radiation fin temperature, and the preheating command from the indoor unit.

  • Page 51: Compressor Protection Function

    SiBE041134EB Control Specification 3.3.3 Four Way Valve Operation Compensation Outline At the beginning of operation as the four way valve is switched, the pressure difference to activate the four way valve is acquired when the output frequency is higher than a certain fixed frequency, for a certain fixed time.

  • Page 52: Discharge Pipe Temperature Control

    Control Specification SiBE041134EB Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the internal temperature of the compressor. If the 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 53: Input Current Control

    SiBE041134EB Control Specification Input Current Control Outline The microcomputer calculates the input current while the compressor is running, and sets the 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 54: Freeze-Up Protection Control

    Control Specification SiBE041134EB 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 55: Outdoor Fan Control

    SiBE041134EB 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 56: Defrost Control

    Control Specification SiBE041134EB 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 57: Electronic Expansion Valve Control

    SiBE041134EB 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 58: Pressure Equalizing Control

    Control Specification SiBE041134EB 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 59 SiBE041134EB Control Specification 3.11.7 Discharge Pipe Thermistor Disconnection Control 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 60: Malfunctions

    Control Specification SiBE041134EB 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 Outline An excessive output current is detected and the OL temperature is observed to protect the compressor.

  • Page 61: Part 5 Remote Controller

    SiBE041134EB Part 5 Remote Controller 1. Remote Controller .................52 Remote Controller...

  • Page 62: Remote Controller

    Refer to the following pages for details. 1 Inverter POWERFUL operation P.27 Note: Refer to the operation manual of applicable model for details. You can download operation manuals from Daikin Business Portal: Daikin Business Portal → Product Information → Operation/Installation Manual (URL: https://global1d.daikin.com/business_portal/login/) Remote Controller...

  • Page 63: Mode Button

    4 Auto-swing P.20 7 Clock setting P.28 Note: Refer to the operation manual of applicable model for details. You can download operation manuals from Daikin Business Portal: Daikin Business Portal → Product Information → Operation/Installation Manual (URL: https://global1d.daikin.com/business_portal/login/) Remote Controller...

  • Page 64: Part 6 Service Diagnosis

    SiBE041134EB Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items ........55 2. Troubleshooting with LED ..............56 2.1 Indoor Unit....................56 2.2 Outdoor Unit ...................56 3. Service Diagnosis .................57 4. Troubleshooting ..................60 4.1 Error Codes and Description ..............60 4.2 Indoor Unit PCB Abnormality ..............61 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......62 4.4 Fan Motor (DC Motor) or Related Abnormality........63 4.5 Thermistor or Related Abnormality (Indoor Unit)........65...

  • Page 65: General Problem Symptoms And Check Items

    SiBE041134EB 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 66: Troubleshooting With Led

    Troubleshooting with LED SiBE041134EB 2. 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 67: Service Diagnosis

    SiBE041134EB Service Diagnosis 3. Service Diagnosis Method 1 1. When the timer cancel button is held down for 5 seconds, is displayed on the temperature display screen. Timer cancel button (R22015) < ARC466 Series > 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below.
  • Page 68 Service Diagnosis SiBE041134EB Method 2 1. Press the center of the Temp button and the Mode button at the same time. (R11669) is displayed on the LCD. (R11821) 2. Select (service check) with the Temp or Temp button. 3. Press the Mode button to enter the service check mode. (R11672) The left-side number blinks.
  • Page 69 SiBE041134EB 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 70: Troubleshooting

    Troubleshooting SiBE041134EB 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 71: Indoor Unit Pcb Abnormality

    SiBE041134EB 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 72: Freeze-Up Protection Control / Heating Peak-Cut Control

    Troubleshooting SiBE041134EB Freeze-up Protection Control / 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 73: Fan Motor (Dc Motor) Or Related Abnormality

    SiBE041134EB 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 74 Troubleshooting SiBE041134EB 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.95 with the power supply on.

  • Page 75: Thermistor Or Related Abnormality (Indoor Unit)

    SiBE041134EB 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 voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less during compressor operation.

  • Page 76: Refrigerant Shortage

    Troubleshooting SiBE041134EB Refrigerant Shortage Error Code Method of Error Detecting by discharge pipe temperature Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of Detection the electronic expansion valve. If the refrigerant is short, the discharge pipe temperature tends to rise.
  • Page 77 SiBE041134EB 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.94 Any thermistor Replace the thermistor(s) disconnected? position. ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor Check No.12 ∗...

  • Page 78: Low-Voltage Detection Or Over-Voltage Detection

    Troubleshooting SiBE041134EB Low-voltage Detection or Over-voltage Detection Error Code Method of Error Indoor Unit Detection The zero-cross detection of the power supply is evaluated by the indoor unit PCB. Outdoor Unit Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit.
  • Page 79 SiBE041134EB 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 80: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041134EB 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 81 SiBE041134EB 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.96 Is the Is the voltage fluctuation voltage fluctuation Correct the power supply.

  • Page 82: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041134EB Unspecified Voltage (Between Indoor Unit and Outdoor Unit) Error Code Method of Error The supply power is detected for its requirements (pair type is different from multi type) by the indoor / outdoor transmission signal. Detection Error Decision The pair type and multi type are interconnected.

  • Page 83: Outdoor Unit Pcb Abnormality

    SiBE041134EB Troubleshooting 4.10 Outdoor Unit PCB Abnormality Error Code Method of Error The system checks if the microprocessor is working in order. Detection The system checks if the zero-cross signal comes in properly. Error Decision The microprocessor program runs out of control. The zero-cross signal is not detected.
  • Page 84 Troubleshooting SiBE041134EB Troubleshooting RXS20/25L3V1B, ARXS25L3V1B Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn on the power again. Check the voltage of the connection wires on the indoor terminal board between No. 1 and No.

  • Page 85: Ol Activation (Compressor Overload)

    SiBE041134EB Troubleshooting 4.11 OL Activation (Compressor Overload) Error Code Method of Error A compressor overload is detected through compressor 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 86 Troubleshooting SiBE041134EB 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.94 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.96 Check No.

  • Page 87: Compressor Lock

    SiBE041134EB Troubleshooting 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 88: Dc Fan Lock

    Troubleshooting SiBE041134EB 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 15 ~ 60 seconds (depending on the model) even when the fan motor is running.

  • Page 89: Input Overcurrent Detection

    SiBE041134EB Troubleshooting 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 9.25 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 90: Four Way Valve Abnormality

    Troubleshooting SiBE041134EB 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 minute after operating for 5 minutes. Conditions <Cooling / Dry>...
  • Page 91 SiBE041134EB Troubleshooting 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.94 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.97 Harness disconnected? Reconnect the harness.

  • Page 92: Discharge Pipe Temperature Control

    Troubleshooting SiBE041134EB 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 93: High Pressure Control In Cooling

    SiBE041134EB Troubleshooting 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 65°C.

  • Page 94: Compressor System Sensor Abnormality

    Troubleshooting SiBE041134EB 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 voltage converted from the DC current before compressor start-up is out of the range 0.5 ~ 4.5 V.

  • Page 95: Position Sensor Abnormality

    SiBE041134EB Troubleshooting 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 96 Troubleshooting SiBE041134EB 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.98 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.101 Is the power supply Check No.20...

  • Page 97: Dc Voltage / Current Sensor Abnormality

    SiBE041134EB Troubleshooting 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 If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Conditions Supposed...

  • Page 98: Thermistor Or Related Abnormality (Outdoor Unit)

    Troubleshooting SiBE041134EB 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 voltage between the both ends of the thermistor is above 4.96 V or below 0.04 V with...
  • Page 99 SiBE041134EB Troubleshooting Troubleshooting In case of 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.94 Turn on the power again. Error displayed Reconnect the connectors again on remote or thermistors.

  • Page 100: Electrical Box Temperature Rise

    Troubleshooting SiBE041134EB 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 101: Radiation Fin Temperature Rise

    SiBE041134EB Troubleshooting 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 102: Output Overcurrent Detection

    Troubleshooting SiBE041134EB 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 103 SiBE041134EB 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.98 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 104: Check

    Check SiBE041134EB 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 a multimeter. The data is for reference purpose only. Resistance (kΩ) Thermistor temperature (°C) Room temperature thermistor Other thermistors –20...

  • Page 105: Indoor Fan Motor Connector Output Check

    SiBE041134EB Check Indoor 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 106: Power Supply Waveforms Check

    Check SiBE041134EB 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 107: Four Way Valve Performance Check

    SiBE041134EB 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 108: Inverter Analyzer Check

    Check SiBE041134EB 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 109 SiBE041134EB Check Step 3 RXS20/25K2V1B, RXS20/25K3V1B, RXS20/25L2V1B, ARXS25L2V1B Activate the power transistor test operation from the outdoor unit. 1) Press the forced cooling operation ON/OFF button for 5 seconds. (Refer to page 107 for the position.) → Power transistor test operation starts. RXS20/25L3V1B, ARXS25L3V1B Activate power transistor test operation from the indoor unit.

  • Page 110: Rotation Pulse Check On The Outdoor Unit Pcb

    Check SiBE041134EB Rotation Pulse Check on the Outdoor Unit PCB Check No.16 1. Check that the control voltage between the pins 10 - 11 is 15 VDC. 2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 - 12, 10 - 13, when the fan motor is manually rotated once.

  • Page 111: Installation Condition Check

    SiBE041134EB 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 112: Outdoor Fan System Check

    Check SiBE041134EB 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 No.20...

  • Page 113: Power Module Check

    SiBE041134EB Check RXS20/25L3V1B, ARXS25L3V1B Multimeter (R20698) 5.13 Power Module Check Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is about 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 114 Check SiBE041134EB RXS20/25K2V1B, RXS20/25K3V1B, RXS20/25L2V1B, ARXS25L2V1B DC + = Power module (+) DC – = Power module (–) (R20794) RXS20/25L3V1B, ARXS25L3V1B Pin 24: + Pin 23: U Pin 22: V Pin 21: W Pin 20: – (R20703) Service Diagnosis...

  • Page 115: Part 7 Trial Operation And Field Settings

    SiBE041134EB Part 7 Trial Operation and Field Settings 1. Pump Down Operation................106 2. Forced Cooling Operation ..............107 3. Trial Operation ..................108 4. Field Settings ..................109 4.1 Model Type Setting ................109 4.2 When 2 Units are installed in 1 Room ..........109 4.3 Standby Electricity Saving..............110 4.4 Facility Setting (Cooling at Low Outdoor Temperature) .......110 4.5 Jumper Settings ...................111...

  • Page 116: Pump Down Operation

    Pump Down Operation SiBE041134EB 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of 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 117: Forced Cooling Operation

    SiBE041134EB Forced Cooling Operation 2. Forced Cooling Operation Item Forced Cooling Conditions The forced cooling operation is allowed when both of the following conditions are met. 1) The outdoor unit is not abnormal and not in the 3-minute standby mode. 2) The outdoor unit is not operating.

  • Page 118: Trial Operation

    Trial Operation SiBE041134EB 3. Trial Operation Outline Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as flap movement, are working properly. Trial operation should be carried out in either cooling or heating operation. Detail 1.

  • Page 119: Field Settings

    SiBE041134EB Field Settings 4. Field Settings Model Type Setting ARC466A6 This remote controller is common to the heat pump model and cooling only model. Use the DIP switch on the remote controller to set the heat pump model. Set the DIP switch to H/P as shown in the illustration. (The factory set is the heat pump side.) DIP switch (R18257)

  • Page 120: Standby Electricity Saving

    Field Settings SiBE041134EB Standby Electricity Saving Outline This function turns OFF the power supply to the outdoor unit and sets the indoor unit into standby electricity saving mode, thus reducing the power consumption of the air conditioner. Detail For RXS20/25K2V1B, RXS20/25K3V1B, RXS20/25L2V1B, ARXS25L2V1B, the standby electricity saving function is turned OFF before shipping.

  • Page 121: Jumper Settings

    SiBE041134EB Field Settings Jumper Settings Indoor Unit Function Jumper When connected When cut (factory setting) Fan speed setting when Fan speed setting ; The fan stops. compressor stops for Remote controller thermostat OFF. (effective only setting in cooling operation) Power failure recovery function Auto-restart The unit does not resume operation after recovering from a...

  • Page 122: Silicone Grease On Power Transistor / Diode Bridge

    Silicone Grease on Power Transistor / Diode Bridge SiBE041134EB 5. Silicone Grease on Power Transistor / Diode Bridge Outline Apply the specified silicone grease to the heat radiation part of a power transistor / diode bridge when you replace an outdoor unit PCB. The silicone grease encourages the heat radiation of a power transistor / diode bridge.

  • Page 123: Part 8 Appendix

    SiBE041134EB Part 8 Appendix 1. Piping Diagrams ..................114 1.1 Indoor Unit....................114 1.2 Outdoor Unit ..................115 2. Wiring Diagrams..................116 2.1 Indoor Unit....................116 2.2 Outdoor Unit ..................118 Appendix...

  • Page 124: Piping Diagrams

    Piping Diagrams SiBE041134EB 1. Piping Diagrams Indoor Unit FTXS20/25K2V1B, ATXS25K2V1B INDOOR UNIT HEAT EXCHANGER 7.0 CuT 4.8 CuT 7.0 CuT THERMISTOR ON HEAT EXCH. 7.0 CuT CROSS FLOW FAN FIELD PIPING (6.4 CuT) FAN MOTOR 9.5 CuT FIELD PIPING (9.5 CuT) REFRIGERANT FLOW COOLING HEATING...

  • Page 125: Outdoor Unit

    SiBE041134EB Piping Diagrams Outdoor Unit RXS20/25K2V1B, RXS20/25K3V1B, RXS20/25L2V1B, ARXS25L2V1B OUTDOOR UNIT OUTDOOR TEMPERATURE HEAT EXCHANGER THERMISTOR 7.0CuT 7.0CuT ELECTRONIC EXPANSION HEAT EXCHANGER VALVE THERMISTOR 4.8CuT 6.4CuT 6.4CuT 4.8CuT MUFFLER MUFFLER WITH WITH FILTER FILTER PROPELLER FAN 9.5CuT MUFFLER WITH FILTER FOUR WAY VALVE FIELD PIPING...

  • Page 126: Wiring Diagrams

    Wiring Diagrams SiBE041134EB 2. Wiring Diagrams Indoor Unit FTXS20/25K2V1B, ATXS25K2V1B WIRING DIAGRAM PCB 2 PCB 1 FIELD WIRING. TRANSMISSION GRN/YLW CIRCUIT LED1 LED2 OUTDOOR LED3 RECTIFIER MR10 CAUTION NOTE THAT OPERATION WILL 3.15A RESTART AUTOMATICALLY IF t˚ THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK IPM200 ON AGAIN.
  • Page 127 SiBE041134EB Wiring Diagrams FTXS20/25K3V1B, ATXS25K3V1B PCB1 GRN/YLW PCB2 Transmission circuit LED1 Outdoor C101 C103 MR10 LED2 C102 C104 LED3 Colours 3.15A BLK:Black WHT:White t˚ BRN:Brown IPM200 Indoor RED:Red GRN:Green YLW:Yellow S403 ORG:Orange S200 BLU:Blue S602 S601 t˚ PCB4 PCB3 OPTION Field wiring : Terminal strip : Rectifier...

  • Page 128: Outdoor Unit

    Wiring Diagrams SiBE041134EB Outdoor Unit RXS20/25K2V1B, RXS20/25K3V1B, RXS20/25L2V1B, ARXS25L2V1B FIELD WIRING. INDOOR MRM20 IPM1 MRM10 C119 MR30 3.15A PCB2 3.15A IPM2 MR30_A MR30_B MRCW S100 PCB1 X11A 4 7 10 OUTDOOR NOTE 1. REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. C5 , C6 , C119 : CAPACITOR t˚...
  • Page 129 SiBE041134EB Wiring Diagrams RXS20/25L3V1B, ARXS25L3V1B Field wiring IPM1 Indoor MRM10 C400 MR30 C405 V150 3.15A 3.15A PCB1 MRCW Outdoor FU1,FU2,FU3 : Fuse t˚ t˚ t˚ : Coil : Reactor HL1, HN1, E1, E2, HR1, HR2 X12A X12A, S, MR30_A, MR30_B : Connection Outdoor Condenser...
  • Page 130 Revision History Month / Year Version Revised contents 02 / 2012 SiBE041134 First edition 12 / 2012 SiBE041134_A Model addition: RXS20/25K3V1B 12 / 2015 SiBE041134EB Model addition: FTXS20/25K3V1B, ATXS25K2V1B, ATXS25K3V1B RXS20/25L2V1B, RXS20/25L3V1B, ARXS25L2V1B, ARXS25L3V1B Part 6, 7 (pp.54-112): Reference only...
  • Page 131 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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