Daikin FTXG20LV1BW Service Manual
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Daikin FTXG20LV1BW Service Manual

Inverter pair wall mounted type l-series
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Service
Manual
Inverter Pair
Wall Mounted Type L-Series
SiBE041401E
[Applied Models]
Inverter Pair : Heat Pump

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Summary of Contents for Daikin FTXG20LV1BW

  • Page 1 SiBE041401E Service Manual Inverter Pair Wall Mounted Type L-Series [Applied Models] Inverter Pair : Heat Pump...
  • Page 2 SiBE041401E Inverter Pair Wall Mounted Type L-Series Heat Pump Indoor Unit FTXG20LV1BW FTXG20LV1BS FTXG25LV1BW FTXG25LV1BS FTXG35LV1BW FTXG35LV1BS FTXG50LV1BW FTXG50LV1BS Outdoor Unit RXG20L2V1B RXG25L2V1B RXG35L2V1B RXG50L2V1B Table of Contents...

  • Page 3: Table Of Contents

    SiBE041401E 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. Used Icons ....................x Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............3 1. Specifications ..................4 Part 3 Printed Circuit Board Connector Wiring Diagram .....
  • Page 4 SiBE041401E Part 5 Remote Controller ............49 1. Remote controller..................50 Part 6 Service Diagnosis............. 52 1. General Problem Symptoms and Check Items ........53 2. Troubleshooting with LED ..............54 2.1 Indoor Unit....................54 2.2 Outdoor Unit ...................54 3. Service Diagnosis .................55 4. Troubleshooting ..................58 4.1 Error Codes and Description ..............58 4.2 Indoor Unit PCB Abnormality ..............59 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......60...
  • Page 5 SiBE041401E Part 7 Trial Operation and Field Settings......... 103 1. Tips for Servicing ................104 1.1 Pump Down Operation .................104 1.2 Forced Cooling Operation ..............104 2. Trial Operation ..................106 3. Field Settings ..................107 3.1 When 2 Units are installed in 1 Room ..........107 3.2 Model Type Setting ................107 3.3 Standby Electricity Saving..............108 3.4 Jumper Settings ...................109...

  • Page 6: Safety Cautions

    Safety Cautions SiBE041401E 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 SiBE041401E Safety Cautions 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: Warnings And Cautions Regarding Safety Of Users

    Safety Cautions SiBE041401E Caution Use the welder in a well-ventilated place. Using the 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 successive fire sources (e.g., naked flame, gas appliance, electric heater).
  • Page 9 SiBE041401E 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 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 Safety Cautions SiBE041401E 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

    SiBE041401E Used Icons 2. Used Icons The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning A Warning is used when there is danger of personal injury. Warning Caution A Caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, loose data, get Caution...

  • Page 12: Part 1 List Of Functions

    SiBE041401E Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 13: Functions

    SiBE041401E Functions 1. Functions Category Functions Category Functions Basic Function Inverter (with inverter power control) Health & Clean Air-purifying filter — PAM control Photocatalytic deodorizing filter — Standby electricity saving Air-purifying filter with photocatalytic — deodorizing function Compressor Oval scroll compressor —...

  • Page 14: Part 2 Specifications

    SiBE041401E Part 2 Specifications 1. Specifications ..................4 Specifications...

  • Page 15: Specifications

    SiBE041401E Specifications 1. Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXG20LV1BW FTXG20LV1BS Model RXG20L2V1B RXG20L2V1B Outdoor Unit Cooling Heating Cooling Heating 2.3 (1.3 ~ 2.8) 2.5 (1.3 ~ 4.3) 2.3 (1.3 ~ 2.8) 2.5 (1.3 ~ 4.3)
  • Page 16 Specifications SiBE041401E 50 Hz, 220 - 230 - 240 V Indoor Unit FTXG25LV1BW FTXG25LV1BS Model RXG25L2V1B RXG25L2V1B Outdoor Unit Cooling Heating Cooling Heating 2.4 (1.3 ~ 3.0) 3.4 (1.3 ~ 4.5) 2.4 (1.3 ~ 3.0) 3.4 (1.3 ~ 4.5) Capacity Btu/h 8,200 (4,400 ~ 10,200) 11,600 (4,400 ~ 15,400)
  • Page 17 SiBE041401E Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXG35LV1BW FTXG35LV1BS Model RXG35L2V1B RXG35L2V1B Outdoor Unit Cooling Heating Cooling Heating 3.5 (1.4 ~ 3.8) 4.0 (1.4 ~ 5.0) 3.5 (1.4 ~ 3.8) 4.0 (1.4 ~ 5.0) Capacity Btu/h 11,900 (4,800 ~ 13,000) 13,600 (4,800 ~ 17,100)
  • Page 18 Specifications SiBE041401E 50 Hz, 220 - 230 - 240 V Indoor Unit FTXG50LV1BW FTXG50LV1BS Model RXG50L2V1B RXG50L2V1B Outdoor Unit Cooling Heating Cooling Heating 4.8 (1.7 ~ 5.3) 5.8 (1.7 ~ 6.5) 4.8 (1.7 ~ 5.3) 5.8 (1.7 ~ 6.5) Capacity Btu/h 16,400 (5,800 ~ 18,100) 19,800 (5,800 ~ 22,200)

  • Page 19: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiBE041401E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................9 2. Outdoor Unit..................11 2.1 20/25/35 Class ..................11 2.2 50 Class ....................13 Printed Circuit Board Connector Wiring Diagram...

  • Page 20: Indoor Unit

    Indoor Unit SiBE041401E 1. Indoor Unit Control PCB (A1P) 1) S21 Connector for centralized control (HA) 2) S25 Connector for INTELLIGENT EYE sensor PCB 3) S32 Indoor heat exchanger thermistor 4) S41 Connector for swing motors 5) S42 Connector for reduction motor (front panel mechanism) and limit switch 6) S46 Connector for signal receiver / display PCB 7) S200...
  • Page 21 SiBE041401E Indoor Unit Signal Receiver / Display PCB 1) S51 Connector for control PCB (A2P) 2) S52 Connector for room temperature thermistor 3) S1W Forced cooling operation ON/OFF button ∗ Refer to page 104 for detail. 4) H1P LED for operation (multi-color) 5) H2P LED for INTELLIGENT EYE (green) 6) JA...

  • Page 22: Outdoor Unit

    Outdoor Unit SiBE041401E 2. Outdoor Unit 20/25/35 Class Main PCB (PCB2) 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 Connector for four way valve coil 7) S90...
  • Page 23 SiBE041401E 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 24: Class

    Outdoor Unit SiBE041401E 50 Class Main PCB (PCB2) 1) S10 Connector for S11 on filter PCB 2) S12 Connector for HL4, HN4 on filter PCB 3) S20 Connector for electronic expansion valve coil 4) S40 Connector for overload protector 5) S50 Connector for magnetic relay 6) S70 Connector for fan motor...
  • Page 25 SiBE041401E Outdoor Unit Filter PCB (PCB1) 1) S11 Connector for S10 on main PCB 2) HL1, HN1, S Connector for terminal board 3) E1, E2 Terminal for earth wire 4) HL2, HN2 Connector for HL3, HN3 on main PCB 5) HL4, HN4 Connector for S12 on main PCB 6) FU1 Fuse (3.15 A, 250 V)

  • Page 26: Part 4 Function And Control

    SiBE041401E Part 4 Function and Control 1. Main Functions..................16 1.1 Temperature Control ................16 1.2 Frequency Principle................16 1.3 Operation Starting Control..............18 1.4 Airflow Direction Control.................19 1.5 Fan Speed Control for Indoor Unit ............20 1.6 Program Dry Operation ................21 1.7 Automatic Operation................22 1.8 Thermostat Control.................23 1.9 NIGHT SET Mode ..................24 1.10 ECONO Operation .................24...

  • Page 27: Main Functions

    SiBE041401E Main Functions 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 28 Main Functions SiBE041401E 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 29: Operation Starting Control

    SiBE041401E Main Functions Operation Starting Control Outline The system carries out the following control at the beginning to conduct every functional parts properly. Control Flow Start Fan operation starts Opening the front Closing the flap panel fully fully at 300 rpm Output of the ∆D signal after the Making the fan rotate...

  • Page 30: Airflow Direction Control

    Main Functions SiBE041401E 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. Dual Flaps <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

    SiBE041401E 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 SiBE041401E 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

    SiBE041401E 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 SiBE041401E 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

    SiBE041401E 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 the case of cooling, or lowers it slightly in the case of heating.

  • Page 36: 2-Area Intelligent Eye Operation

    Main Functions SiBE041401E 1.11 2-Area INTELLIGENT EYE Operation Outline The following functions can be performed by a motion sensor (INTELLIGENT EYE). 1. Reduction of the capacity when there is nobody in the room in order to save electricity (energy saving operation) 2.
  • Page 37 SiBE041401E Main Functions 2. The motions (in cooling) within within 20 min. within 20 min. 20 min. 20 min. Human detection signal ↑ ↑ ↑ Reset Reset Reset Target temperature Remote controller INTELLIGENT EYE button Operation Set speed Set speed Fan speed ( ) (R19414) ★...

  • Page 38: Inverter Powerful Operation

    Main Functions SiBE041401E 1.12 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 39: Clock Setting

    SiBE041401E Main Functions The lamp color changes according to the operation. ∗ AUTO ............Red / Blue ∗ DRY ............Green ∗ COOL............Blue ∗ HEAT ............Red ∗ FAN............White ∗ TIMER............Orange Brightness Each time the Brightness button on the remote controller is pressed, the brightness of the multi-monitor lamp changes to high, low, or off.

  • Page 40: Weekly Timer Operation

    Main Functions SiBE041401E 1.15 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 41 SiBE041401E Main Functions 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 42 Main Functions SiBE041401E 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 43 SiBE041401E Main Functions 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 44 Main Functions SiBE041401E Confirming a reservation • The reservation can be confirmed. Setting Displays Normal Confirmation Press • 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 45 SiBE041401E Main Functions 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 46: Other Functions

    Main Functions SiBE041401E 1.16 Other Functions 1.16.1 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 47: Function Of Thermistor

    SiBE041401E Function of Thermistor 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 48: Control Specification

    Control Specification SiBE041401E 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 49 SiBE041401E Control Specification 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. 3.

  • Page 50: Controls At Mode Changing / Start-Up

    Control Specification SiBE041401E 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 51: Discharge Pipe Temperature Control

    SiBE041401E Control Specification 3.3.4 3-minute Standby Turning on the compressor is prohibited for 3 minutes after turning it off. (The function is not activated 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 52: Input Current Control

    Control Specification SiBE041401E 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 53: Freeze-Up Protection Control

    SiBE041401E Control Specification 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 54: Outdoor Fan Control

    Control Specification SiBE041401E 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 55: Defrost Control

    SiBE041401E Control Specification 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 56: Electronic Expansion Valve Control

    Control Specification SiBE041401E 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 57 SiBE041401E Control Specification 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 58 Control Specification SiBE041401E 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 59: Malfunctions

    SiBE041401E Control Specification 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 60: Part 5 Remote Controller

    SiBE041401E Part 5 Remote Controller 1. Remote controller..................50 Remote Controller...

  • Page 61: Remote Controller

    Refer to the following pages for detail. ★1 POWERFUL operation P.27 Note: Refer to the operation manual of applicable model for detail. You can download operation manual 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 62 P.29 ★4 ECONO operation ★7 Clock setting P.24 P.28 Note: Refer to the operation manual of applicable model for detail. You can download operation manual 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 63: Part 6 Service Diagnosis

    SiBE041401E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items ........53 2. Troubleshooting with LED ..............54 2.1 Indoor Unit....................54 2.2 Outdoor Unit ...................54 3. Service Diagnosis .................55 4. Troubleshooting ..................58 4.1 Error Codes and Description ..............58 4.2 Indoor Unit PCB Abnormality ..............59 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......60 4.4 Fan Motor (DC Motor) or Related Abnormality........61 4.5 Thermistor or Related Abnormality (Indoor Unit)........63...

  • Page 64: General Problem Symptoms And Check Items

    General Problem Symptoms and Check Items SiBE041401E 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 65: Troubleshooting With Led

    SiBE041401E Troubleshooting with LED 2. Troubleshooting with LED Indoor Unit Operation Lamp The multi-monitor 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 66: Service Diagnosis

    Service Diagnosis SiBE041401E 3. Service Diagnosis 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature Method 1 display screen. Timer cancel button (R14553) < ARC466 Series > 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below.
  • Page 67 SiBE041401E Service Diagnosis 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 5C (service check) with the Temp ▲ or Temp ▼ button. 3.
  • Page 68 Service Diagnosis SiBE041401E 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 69: Troubleshooting

    SiBE041401E Troubleshooting 4. Troubleshooting Error Codes and Description Reference Error Codes Description Page System Normal — U0★ 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 70: Indoor Unit Pcb Abnormality

    Troubleshooting SiBE041401E 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 71: Freeze-Up Protection Control / Heating Peak-Cut Control

    SiBE041401E Troubleshooting 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 72: Fan Motor (Dc Motor) Or Related Abnormality

    Troubleshooting SiBE041401E 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 73 SiBE041401E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.02 Check the power supply Refer to P.94 voltage. Is the voltage fluctuation Correct the power within ±10% from supply.

  • Page 74: Thermistor Or Related Abnormality (Indoor Unit)

    Troubleshooting SiBE041401E 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 4.96 V and more or 0.04 V and less during compressor operation. Conditions Supposed Disconnection of connector...

  • Page 75: Front Panel Open / Close Fault

    SiBE041401E Troubleshooting Front Panel Open / Close Fault Error Code Method of Error Detection Error Decision If the error repeats, the system is shut down. Conditions Supposed Defective reduction motor Malfunction or deterioration of the front panel mechanism Causes Defective limit switch Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution...

  • Page 76: Refrigerant Shortage

    Troubleshooting SiBE041401E 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 77 SiBE041401E 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.93 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 SiBE041401E 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 SiBE041401E 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 SiBE041401E 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 SiBE041401E 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.94 Is the Is the voltage fluctuation voltage fluctuation Correct the power supply.

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

    Troubleshooting SiBE041401E 4.10 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 Detection indoor / outdoor transmission signal. Error Decision The pair type and multi type are interconnected.

  • Page 83: Outdoor Unit Pcb Abnormality

    SiBE041401E Troubleshooting 4.11 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: Ol Activation (Compressor Overload)

    Troubleshooting SiBE041401E 4.12 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 85 SiBE041401E 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.93 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.94 Check No.

  • Page 86: Compressor Lock

    Troubleshooting SiBE041401E 4.13 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 20/25/35 class Operation stops due to overcurrent. Conditions If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes without any other error 50 class A compressor lock is detected by the current waveform generated when applying high-...

  • Page 87: Dc Fan Lock

    SiBE041401E Troubleshooting 4.14 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 ~ 30 seconds even when the fan motor is running. If the error repeats, the system is shut down.

  • Page 88: Input Overcurrent Detection

    Troubleshooting SiBE041401E 4.15 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 ~ 20 A (depending on the model) for 2.5 seconds with the compressor running.

  • Page 89: Four Way Valve Abnormality

    SiBE041401E Troubleshooting 4.16 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 1 ~ 10 minutes (depending on the model) after operating for 5 ~ 10 minutes (depending on the model).
  • Page 90 Troubleshooting SiBE041401E 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.93 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.95 Harness disconnected? Reconnect the harness.

  • Page 91: Discharge Pipe Temperature Control

    SiBE041401E Troubleshooting 4.17 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 92: High Pressure Control In Cooling

    Troubleshooting SiBE041401E 4.18 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 ~ 65°C (depending on the model).

  • Page 93: Compressor System Sensor Abnormality

    SiBE041401E Troubleshooting 4.19 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 converted to voltage value) Conditions The DC voltage before compressor start-up is below 50 V.

  • Page 94: Position Sensor Abnormality

    Troubleshooting SiBE041401E 4.20 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 (20/25/35 class) or 5 minutes Conditions (50 class) without any other error...
  • Page 95 SiBE041401E 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.96 Turn off the power. Check No.18 Check the power supply voltage. Refer to P.99 Voltage as rated? Correct the power supply.

  • Page 96: Dc Voltage / Current Sensor Abnormality (20/25/35 Class Only)

    Troubleshooting SiBE041401E 4.21 DC Voltage / Current Sensor Abnormality (20/25/35 Class Only) 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 97: Thermistor Or Related Abnormality (Outdoor Unit)

    SiBE041401E Troubleshooting 4.22 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 4.96 V and more or 0.04 V and less with the power on.
  • Page 98 Troubleshooting SiBE041401E 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.93 Turn on the power again. Error displayed Reconnect the connectors again on remote...

  • Page 99: Electrical Box Temperature Rise

    SiBE041401E Troubleshooting 4.23 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 100: Radiation Fin Temperature Rise

    Troubleshooting SiBE041401E 4.24 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 101 SiBE041401E 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.98 again to start the system. Check No.19 Has the PCB been Error displayed again?

  • Page 102: Output Overcurrent Detection

    Troubleshooting SiBE041401E 4.25 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 speed error occurs while the compressor is running.
  • Page 103 SiBE041401E 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.96 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 104: Check

    Check SiBE041401E 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. Thermistor temperature (°C) Resistance (kΩ) –20 197.8 –15...

  • Page 105: Fan Motor Connector Output Check

    SiBE041401E Check Fan Motor Connector Output Check Check No.02 1. Check the connection of connector. 2. Check the motor power supply voltage output (pins 4 - 7). 3. Check the motor control voltage (pins 4 - 3). 4. Check the rotation command voltage (pins 4 - 2). 5.

  • Page 106: Four Way Valve Performance Check

    Check SiBE041401E Four Way Valve Performance Check Check No.13 Turn the power off and then on again. ∗ Four way valve coil Start heating operation. Cooling / Dry : No continuity Heating : Continuity voltage at 220 - 240 Replace the outdoor unit VAC with compressor PCB.

  • Page 107: Inverter Analyzer Check

    SiBE041401E Check 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 108: Rotation Pulse Check On The Outdoor Unit Pcb

    Check SiBE041401E 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.

  • Page 109: Installation Condition Check

    SiBE041401E Check 50 class Make sure that the voltage of 320 ± 30 V is applied. 1. Set operation off and power off. Disconnect the connector S70. 2. Check that the voltage between the pins 4 - 7 is 320 VDC. 3.

  • Page 110: Discharge Pressure Check

    Check SiBE041401E 5.10 Discharge Pressure Check Check No.18 Discharge pressure check High? Replace the compressor. Is the stop valve open? Open the stop valve. Is the connection pipe Replace the pipe installed at deformed? the site. Is the air filter or indoor / outdoor Replace the compressor.

  • Page 111: Main Circuit Short Check

    SiBE041401E Check 5.12 Main Circuit Short Check Check No.20 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approximately 0 V before checking. Measure the resistance between the pins of the DB1 referring to the table below. ∞...

  • Page 112: Power Module Check

    Check SiBE041401E 5.13 Power Module Check Check No.22 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge or 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 113 SiBE041401E Check 50 class (R19944) Diode bridge Service Diagnosis...

  • Page 114: Part 7 Trial Operation And Field Settings

    SiBE041401E Part 7 Trial Operation and Field Settings 1. Tips for Servicing ................104 1.1 Pump Down Operation .................104 1.2 Forced Cooling Operation ..............104 2. Trial Operation ..................106 3. Field Settings ..................107 3.1 When 2 Units are installed in 1 Room ..........107 3.2 Model Type Setting ................107 3.3 Standby Electricity Saving..............108 3.4 Jumper Settings ...................109...

  • Page 115: Tips For Servicing

    SiBE041401E Tips for Servicing 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 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 116 Tips for Servicing SiBE041401E Indoor Unit Indoor unit ON/OFF button (R19927) Outdoor Unit: 20/25/35 class Terminal board Screwdriver Push here (R18256) Outdoor Unit: 50 class Terminal board Forced cooling operation ON/OFF button (SW1) Push Screwdriver (R20102) Caution When pressing the button on the outdoor unit, do not touch the terminal board. It has a high voltage and may cause electric shock.

  • Page 117: Trial Operation

    SiBE041401E Trial Operation 2. 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 118: Field Settings

    Field Settings SiBE041401E 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 119: Standby Electricity Saving

    SiBE041401E Field Settings Standby Electricity Saving Outline This function turns power supply OFF to the outdoor unit and sets the indoor unit into standby electricity saving mode, thus reducing the power consumption of the air conditioner. Detail Following procedure is required for turning ON the function. 1.

  • Page 120: Jumper Settings

    Field Settings SiBE041401E Jumper Settings Indoor Unit Function Jumper When connected When cut (factory setting) Fan speed setting when The fan stops. Fan speed setting ; compressor stops for Remote controller setting thermostat OFF. (effective only in cooling operation) Power failure recovery function Auto-restart The unit does not resume operation after recovering from a...

  • Page 121: Silicon Grease On Power Transistor / Diode Bridge

    SiBE041401E 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 122: Part 8 Appendix

    SiBE041401E Part 8 Appendix 1. Piping Diagrams..................112 1.1 Indoor Unit....................112 1.2 Outdoor Unit ..................112 2. Wiring Diagrams..................114 2.1 Indoor Unit....................114 2.2 Outdoor Unit ..................114 Appendix...

  • Page 123: Piping Diagrams

    SiBE041401E Piping Diagrams 1. Piping Diagrams Indoor Unit FTXG20/25/35LV1BW(S) FTXG50LV1BW(S) INDOOR UNIT INDOOR UNIT 6.4CuT 6.4CuT HEAT HEAT EXCHANGER EXCHANGER THERMISTOR THERMISTOR CROSS FLOW FAN CROSS FLOW FAN ON HEAT EXCH. ON HEAT EXCH. FIELD PIPING FIELD PIPING 6.4CuT 6.4CuT FAN MOTOR FAN MOTOR FIELD PIPING...
  • Page 124 Piping Diagrams SiBE041401E RXG50L2V1B OUTDOOR UNIT HEAT EXCHANGER OUTDOOR TEMPERATURE 7.9 CuT THERMISTOR 7.9 CuT 7.9 CuT 7.9 CuT 12.7 CuT 7.9 CuT CAPILLARY TUBE 1 7.9 CuT 4.0 CuT 7.9 CuT MUFFLER 7.9 CuT 4.0 CuT WITH 7.9 CuT REFRIGERANT FLOW FILTER CAPILLARY TUBE 2...

  • Page 125: Wiring Diagrams

    SiBE041401E Wiring Diagrams 2. Wiring Diagrams Indoor Unit FTXG20/25/35/50LV1BW(S) : FRAME GROUND WIRING DIAGRAM F1U, F2U : FUSE H1P, H2P : PILOT LAMP : FAN MOTOR OUTDOOR M1S, M2S, M3S : SWING MOTOR : STEPPING MOTOR TRANSMISSION A1P~A3P : PRINTED CIRCUIT BOARD CIRCUIT FIELD WIRING.
  • Page 126 Wiring Diagrams SiBE041401E RXG50L2V1B FIELD WIRING. INDOOR TO INDOOR UNIT POWER SUPPLY OUTDOOR NOTE 1. REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS. C7, C8 : CAPACITOR DB1, DB3 : DIODE BRIDGE IN CASE OF COOLING ONLY FU1, FU2, FU3 : FUSE (OUTDOOR) (DISCHARGE)
  • Page 127 Revision History Month / Year Version Revised contents 03 / 2014 SiBE041401E First edition...
  • Page 128 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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