Daikin FTX50GV1B Service Manual
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Daikin FTX50GV1B Service Manual

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Service
Manual
Inverter Pair
Wall Mounted Type FTX-G Series
SiBE041029EC
[Applied Models]
Inverter Pair : Heat Pump

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  • Page 1 SiBE041029EC Service Manual Inverter Pair Wall Mounted Type FTX-G Series [Applied Models] Inverter Pair : Heat Pump...
  • Page 2 SiBE041029EC Inverter Pair Wall Mounted Type FTX-G Series Heat Pump Indoor Unit FTX50GV1B FTX60GV1B FTX71GV1B Outdoor Unit RX50G2V1B RX60G2V1B RX71GV1B RX50G2V1B9 RX60G2V1B9 RX71GV1B9 RX50G3V1B RX60G3V1B RX71GV1B8 RX60G4V1B Table of Contents...

  • Page 3: Table Of Contents

    SiBE041029EC 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 SiBE041029EC Part 5 Remote Controller ............46 1. Remote Controller .................47 Part 6 Service Diagnosis............. 49 1. General Problem Symptoms and Check Items ........51 2. Troubleshooting with LED ..............52 2.1 Indoor Unit....................52 2.2 Outdoor Unit ...................52 3. Service Diagnosis .................53 4.
  • Page 5 SiBE041029EC 5.14 Power Module Check ................102 Part 7 Trial Operation and Field Settings......... 104 1. Pump Down Operation................105 2. Forced Cooling Operation ..............106 3. Trial Operation ..................107 4. Field Settings ..................108 4.1 When 2 Units are installed in 1 Room ..........108 4.2 Facility Setting (Cooling at Low Outdoor Temperature) .......109 4.3 Jumper and Switch Settings..............110 5.

  • Page 6: Safety Cautions

    Safety Cautions SiBE041029EC 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 SiBE041029EC 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 SiBE041029EC 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 SiBE041029EC 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 SiBE041029EC 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

    SiBE041029EC 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, lose data, get Caution...

  • Page 12: Part 1 List Of Functions

    SiBE041029EC Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 13: Functions

    SiBE041029EC Functions 1. Functions Category Functions Category Functions Basic Function Inverter (with inverter power control) Health & Clean Air-purifying filter — –10 Operation limit for cooling (°CDB) Photocatalytic deodorizing filter — –15 Air-purifying filter with photocatalytic Operation limit for heating (°CWB) —...

  • Page 14: Part 2 Specifications

    SiBE041029EC Part 2 Specifications 1. Specifications ..................4 Specifications...

  • Page 15: Specifications

    SiBE041029EC Specifications 1. Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTX50GV1B FTX60GV1B Model RX50G2V1B RX60G2V1B Outdoor Unit Cooling Heating Cooling Heating 5.0 (1.7 ~ 6.0) 5.8 (1.7 ~ 7.7) 6.0 (1.7 ~ 6.7) 7.0 (1.7 ~ 8.0)
  • Page 16 Specifications SiBE041029EC 50 Hz, 220 - 230 - 240 V Indoor Unit FTX71GV1B Model RX71GV1B Outdoor Unit Cooling Heating 7.1 (2.3 ~ 8.5) 8.2 (2.3 ~ 10.2) Capacity Rated Btu/h 24,200 (7,800 ~ 29,000) 28,000 (7,800 ~ 34,800) (Min. ~ Max.) kcal/h 6,110 (1,980 ~ 7,310) 7,050 (1,980 ~ 8,770)
  • Page 17 SiBE041029EC Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTX50GV1B FTX60GV1B Model RX50G2V1B9 RX60G2V1B9 Outdoor Unit Cooling Heating Cooling Heating 5.0 (1.7 ~ 6.0) 5.8 (1.7 ~ 7.7) 6.0 (1.7 ~ 6.7) 7.0 (1.7 ~ 8.0) Capacity Rated...
  • Page 18 Specifications SiBE041029EC 50 Hz, 220 - 230 - 240 V Indoor Unit FTX71GV1B Model RX71GV1B9 Outdoor Unit Cooling Heating 7.1 (2.3 ~ 8.5) 8.2 (2.3 ~ 10.2) Capacity Rated Btu/h 24,200 (7,800 ~ 29,000) 28,000 (7,800 ~ 34,800) (Min. ~ Max.) kcal/h 6,110 (1,980 ~ 7,310) 7,050 (1,980 ~ 8,770)
  • Page 19 SiBE041029EC Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTX50GV1B FTX60GV1B Model RX50G3V1B RX60G3V1B Outdoor Unit Cooling Heating Cooling Heating 5.0 (1.7 ~ 6.0) 5.8 (1.7 ~ 7.7) 6.0 (1.7 ~ 6.7) 7.0 (1.7 ~ 8.0) Capacity Rated...
  • Page 20 Specifications SiBE041029EC 50 Hz, 220 - 230 - 240 V Indoor Unit FTX60GV1B Model RX60G4V1B Outdoor Unit Cooling Heating 6.0 (1.7 ~ 6.7) 7.0 (1.7 ~ 8.0) Capacity Rated Btu/h 20,500 (5,800 ~ 22,900) 23,900 (5,800 ~ 27,300) (Min. ~ Max.) kcal/h 5,160 (1,460 ~ 5,760) 6,020 (1,460 ~ 6,880)
  • Page 21 SiBE041029EC Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTX71GV1B Model RX71GV1B8 Outdoor Unit Cooling Heating 7.1 (2.3 ~ 8.5) 8.2 (2.3 ~ 10.2) Capacity Rated Btu/h 24,200 (7,800 ~ 29,000) 28,000 (7,800 ~ 34,800) (Min. ~ Max.) kcal/h 6,110 (1,980 ~ 7,310) 7,050 (1,980 ~ 8,770)

  • Page 22: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiBE041029EC Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit.....................12 2. Outdoor Unit..................14 2.1 RX50/60G2V1B, 71 Class..............14 2.2 RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B........16 Printed Circuit Board Connector Wiring Diagram...

  • Page 23: Indoor Unit

    SiBE041029EC Indoor Unit 1. Indoor Unit Control PCB (PCB1) 1) S1 Connector for DC fan motor 2) S6 Connector for swing motor (horizontal blades) 3) S8 Connector for swing motor (vertical blades) 4) S21 Connector for centralized control (HA) 5) S26 Connector for buzzer PCB 6) S28 Connector for signal receiver PCB...
  • Page 24 Indoor Unit SiBE041029EC Signal Receiver 1) S29 Connector for control PCB PCB (PCB2) 2) SW1 (S1W) Forced cooling operation ON/OFF button ∗ Refer to page 106 for detail. 2P099167-1 2P290430-1 Buzzer PCB 1) S27 Connector for control PCB (PCB3) 2) S38 Connector for display PCB 3) RTH1 (R1T) Room temperature thermistor...

  • Page 25: Outdoor Unit

    SiBE041029EC Outdoor Unit 2. Outdoor Unit RX50/60G2V1B, 71 Class Main PCB (PCB 1) 1) S10 Connector for terminal board (indoor - outdoor transmission) 2) S20 Connector for electronic expansion valve coil 3) S40 Connector for overload protector 4) S51, S101 Connector for service monitor PCB 5) S70 Connector for fan motor...
  • Page 26 Outdoor Unit SiBE041029EC 71 class (3.15A) E1 E2 V100 (30A) (white) (blue) S101 2P171491-7 (3.15A) Service Monitor PCB (PCB 2) 1) S52, S102 Connector for main PCB 2) LED A LED for service monitor (green) 3) SW1 Forced cooling operation ON/OFF button ∗...

  • Page 27: Rx50/60G2V1B9, Rx50/60G3V1B, Rx60G4V1B

    SiBE041029EC Outdoor Unit RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B Filter PCB (PCB 1) 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...
  • Page 28 Outdoor Unit SiBE041029EC Main PCB (PCB 2) 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 29: Part 4 Function And Control

    SiBE041029EC Part 4 Function and Control 1. Main Functions..................19 1.1 Temperature Control ................19 1.2 Frequency Principle................19 1.3 Airflow Direction Control.................21 1.4 Fan Speed Control for Indoor Unit ............22 1.5 Program Dry Operation ................23 1.6 Automatic Operation................24 1.7 Thermostat Control.................25 1.8 NIGHT SET Mode ..................26 1.9 HOME LEAVE Operation ...............26 1.10 INTELLIGENT EYE Operation ...............28 1.11 Inverter POWERFUL Operation .............29...

  • Page 30: Main Functions

    Main Functions SiBE041029EC 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor Target temperature: temperature determined by microcomputer Target temperature Room thermistor temperature...
  • Page 31 SiBE041029EC 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 32: Airflow Direction Control

    Main Functions SiBE041029EC 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 33: Fan Speed Control For Indoor Unit

    SiBE041029EC Main Functions Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.

  • Page 34: Program Dry Operation

    Main Functions SiBE041029EC Program Dry Operation Outline Program dry operation removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting buttons are inoperable. Detail The microcomputer automatically sets the temperature and airflow rate. The difference between the room thermistor temperature at start-up and the target temperature is divided into two zones.

  • Page 35: Automatic Operation

    SiBE041029EC Main Functions Automatic Operation Outline Automatic Cooling / Heating Function When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.

  • Page 36: Thermostat Control

    Main Functions SiBE041029EC 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 37: Night Set Mode

    SiBE041029EC 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 38 Main Functions SiBE041029EC End of Function The function ends when the HOME LEAVE button is pressed again during HOME LEAVE operation or when the POWERFUL button is pressed. <Cooling> HOME LEAVE operation HOME LEAVE operation set temp. Set temp. Normal operation Normal operation Time Start...

  • Page 39: Intelligent Eye Operation

    SiBE041029EC Main Functions 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 40: Inverter Powerful Operation

    Main Functions SiBE041029EC 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 41: Other Functions

    SiBE041029EC Main Functions 1.13 Other Functions 1.13.1 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 42: Function Of Thermistor

    Function of Thermistor SiBE041029EC 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 43: Control Specification

    SiBE041029EC 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 44: Frequency Control

    Control Specification SiBE041029EC 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 45 SiBE041029EC 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 recognized as the ∆D signal and is used for frequency command. ∆D ∆D ∆D...

  • Page 46: Controls At Mode Changing / Start-Up

    Control Specification SiBE041029EC 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 47 SiBE041029EC 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 48: Discharge Pipe Temperature Control

    Control Specification SiBE041029EC 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 49: Input Current Control

    SiBE041029EC 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 50: Freeze-Up Protection Control

    Control Specification SiBE041029EC 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 51: Outdoor Fan Control

    SiBE041029EC 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 52: Defrost Control

    Control Specification SiBE041029EC 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 53: Electronic Expansion Valve Control

    SiBE041029EC 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 54: Pressure Equalizing Control

    Control Specification SiBE041029EC 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 55 SiBE041029EC 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 56: Malfunctions

    Control Specification SiBE041029EC 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 57: Part 5 Remote Controller

    SiBE041029EC Part 5 Remote Controller 1. Remote Controller .................47 Remote Controller...

  • Page 58: Remote Controller

    1 HOME LEAVE operation P.26 2 Inverter POWERFUL operation P.29 Note: Refer to the operation manual of applicable model for detail. 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 59: Mode Button

    5 Clock setting P.29 4 Auto-swing P.21 Note: Refer to the operation manual of applicable model for detail. 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 60: Part 6 Service Diagnosis

    SiBE041029EC Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items ........51 2. Troubleshooting with LED ..............52 2.1 Indoor Unit....................52 2.2 Outdoor Unit ...................52 3. Service Diagnosis .................53 4. Troubleshooting ..................56 4.1 Error Codes and Description ..............56 4.2 Indoor Unit PCB Abnormality ..............57 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......58 4.4 Fan Motor (DC Motor) or Related Abnormality........59 4.5 Thermistor or Related Abnormality (Indoor Unit)........61...
  • Page 61 SiBE041029EC 5.13 Capacitor Voltage Check..............102 5.14 Power Module Check ................102 Service Diagnosis...

  • Page 62: General Problem Symptoms And Check Items

    General Problem Symptoms and Check Items SiBE041029EC 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 63: Troubleshooting With Led

    SiBE041029EC Troubleshooting with LED 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 64: Service Diagnosis

    Service Diagnosis SiBE041029EC 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 < ARC433 Series > (R18206) 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below.
  • Page 65 SiBE041029EC Service Diagnosis Method 2 1. Press the center of the TEMP button and the MODE button at the same time to enter the diagnosis mode. (R4272) The left-side number blinks. (R14967) 2. Press the TEMP or TEMP button and change the number until you hear the two consecutive beeps or the long beep.
  • Page 66 Service Diagnosis SiBE041029EC 5. Press the TEMP or TEMP button and change the number until you hear the long beep. (R4277) 6. Diagnose by the sound. beep: The left-side number does not correspond with the error code. two consecutive beeps: The left-side number corresponds with the error code but the right-side number does not.

  • Page 67: Troubleshooting

    SiBE041029EC Troubleshooting 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 68: Indoor Unit Pcb Abnormality

    Troubleshooting SiBE041029EC 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 69: Freeze-Up Protection Control / Heating Peak-Cut Control

    SiBE041029EC 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 70: Fan Motor (Dc Motor) Or Related Abnormality

    Troubleshooting SiBE041029EC 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 71 SiBE041029EC 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.96 voltage. Is the voltage fluctuation Correct the power within ±10% from supply.

  • Page 72: Thermistor Or Related Abnormality (Indoor Unit)

    Troubleshooting SiBE041029EC 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 73: Refrigerant Shortage

    SiBE041029EC Troubleshooting Refrigerant Shortage Error Code Method of Error Refrigerant shortage is detected by checking the input current value and the compressor running frequency. If the refrigerant is short, the input current is lower than the normal value. Detection Error Decision The following conditions continue for 7 minutes.
  • Page 74 Troubleshooting SiBE041029EC 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.95 Any thermistor Replace the thermistor(s) disconnected? position. ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor Check No.12 ∗...

  • Page 75: Low-Voltage Detection Or Over-Voltage Detection

    SiBE041029EC Troubleshooting Low-voltage Detection or Over-voltage Detection Error Code Method of Error Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. Detection Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit. Error Decision Low-voltage detection: Conditions...
  • Page 76 Troubleshooting SiBE041029EC 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 77: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    SiBE041029EC Troubleshooting 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 78 Troubleshooting SiBE041029EC Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Refer to P.96 Check the power supply voltage. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the indoor unit - outdoor...

  • Page 79: Signal Transmission Error On Outdoor Unit Pcb (Rx50/60G2V1B, 71 Class Only)

    SiBE041029EC Troubleshooting Signal Transmission Error on Outdoor Unit PCB (RX50/60G2V1B, 71 Class Only) Error Code Method of Error Communication error between microcomputer mounted on the main microcomputer and PM1. Detection Error Decision The abnormality is determined when the data sent from the PM1 can not be received for 9 seconds.

  • Page 80: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041029EC 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 81: Outdoor Unit Pcb Abnormality

    SiBE041029EC 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 82 Troubleshooting SiBE041029EC Troubleshooting RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn on the power again. Continuously ON or OFF Is LED A blinking? Replace the outdoor unit PCB (main PCB).

  • Page 83: Ol Activation (Compressor Overload)

    SiBE041029EC Troubleshooting 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 84 Troubleshooting SiBE041029EC 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.95 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.96 Check No.

  • Page 85: Compressor Lock

    SiBE041029EC Troubleshooting 4.13 Compressor Lock Error Code Method of Error A compressor lock is detected by the current waveform generated when applying high- frequency voltage to the motor. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 5 minutes without any other error Conditions Supposed...

  • Page 86: Dc Fan Lock

    Troubleshooting SiBE041029EC 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 30 seconds even when the fan motor is running. If the error repeats, the system is shut down.

  • Page 87: Input Overcurrent Detection

    SiBE041029EC Troubleshooting 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 20 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 88: Four Way Valve Abnormality

    Troubleshooting SiBE041029EC 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 minute after operating for 10 minutes. Conditions <Cooling / Dry>...
  • Page 89 SiBE041029EC 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.95 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.97 Harness disconnected? Reconnect the harness.

  • Page 90: Discharge Pipe Temperature Control

    Troubleshooting SiBE041029EC 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 91: High Pressure Control In Cooling

    SiBE041029EC Troubleshooting 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 92: Compressor System Sensor Abnormality

    Troubleshooting SiBE041029EC 4.19 Compressor System Sensor Abnormality 4.19.1 RX50/60G2V1B, 71 Class Error Code Method of Error The system checks the power supply voltage and the DC voltage before the compressor starts. Detection The system checks the compressor current right after the compressor starts. Error Decision The power supply voltage and the DC voltage is obviously low or high.
  • Page 93 SiBE041029EC Troubleshooting 4.19.2 RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B 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. Conditions The DC voltage before compressor start-up is below 50 V.

  • Page 94: Position Sensor Abnormality

    Troubleshooting SiBE041029EC 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 5 minutes without any other error Conditions Supposed...
  • Page 95 SiBE041029EC Troubleshooting Troubleshooting RX50/60G2V1B, 71 class 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.100 Voltage as rated? Correct the power supply.
  • Page 96 Troubleshooting SiBE041029EC Troubleshooting RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B 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.100 Voltage as rated? Correct the power supply.

  • Page 97: Ct Or Related Abnormality (Rx50/60G2V1B, 71 Class Only)

    SiBE041029EC Troubleshooting 4.21 CT or Related Abnormality (RX50/60G2V1B, 71 Class Only) Error Code Method of Error A CT or related error is detected by checking the compressor running frequency and CT- detected input current. Detection Error Decision The compressor running frequency is more than A Hz, and the CT input current is less than B A.
  • Page 98 Troubleshooting SiBE041029EC Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Turn off the power. Then, turn on Refer to P.98 the power to restart the system. Start operation.

  • Page 99: Thermistor Or Related Abnormality (Outdoor Unit)

    SiBE041029EC 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 voltage between the both ends of the thermistor is above 4.96 V or below 0.04 V with...
  • Page 100 Troubleshooting SiBE041029EC 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.95 Turn on the power again. Error displayed Reconnect the connectors again on remote...

  • Page 101: Electrical Box Temperature Rise

    SiBE041029EC 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 102: Radiation Fin Temperature Rise

    Troubleshooting SiBE041029EC 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 103 SiBE041029EC 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. Then, turn on Refer to P.100 the power to restart the system. Check No.19 Has the PCB been Error displayed again?

  • Page 104: Output Overcurrent Detection

    Troubleshooting SiBE041029EC 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 rotation speed error occurs while the compressor is running.
  • Page 105 SiBE041029EC 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 106: Check

    Check SiBE041029EC 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 107: Indoor Fan Motor Connector Output Check

    SiBE041029EC Check Indoor 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 108: Four Way Valve Performance Check

    Check SiBE041029EC 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 109: Inverter Analyzer Check

    SiBE041029EC 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 110: Rotation Pulse Check On The Outdoor Unit Pcb

    Check SiBE041029EC Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) If all the LEDs are lit uniformly, the compressor is defective. → Replace the compressor. (2) If the LEDs are not lit uniformly, check the power module. → Refer to Check No.22. (3) If NG in Check No.22, replace the power module.

  • Page 111: Installation Condition Check

    SiBE041029EC 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 SiBE041029EC 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: Capacitor Voltage Check

    SiBE041029EC Check 5.13 Capacitor Voltage Check Check No.21 RX50/60G2V1B, 71 class only Before this check, be sure to check the main circuit for short circuit. With the circuit breaker still on, measure the voltage according to the drawing of the model in question.
  • Page 114 Check SiBE041029EC RX50/60G2V1B, 71 class ∗ The illustration is for 71 class as representative. Pin 7: Power module (–) Pin 6: Power module (+) Pin 3: Pin 4: Pin 5: (R21283) RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B (R22038) DC_N1: DC_P1: Power module (–) Power module (+) Service Diagnosis...

  • Page 115: Part 7 Trial Operation And Field Settings

    SiBE041029EC Part 7 Trial Operation and Field Settings 1. Pump Down Operation................105 2. Forced Cooling Operation ..............106 3. Trial Operation ..................107 4. Field Settings ..................108 4.1 When 2 Units are installed in 1 Room ..........108 4.2 Facility Setting (Cooling at Low Outdoor Temperature) .......109 4.3 Jumper and Switch Settings..............110 5.

  • Page 116: Pump Down Operation

    Pump Down Operation SiBE041029EC 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

    SiBE041029EC 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 SiBE041029EC 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

    SiBE041029EC Field Settings 4. 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 120: Facility Setting (Cooling At Low Outdoor Temperature)

    Field Settings SiBE041029EC Facility Setting (Cooling at Low Outdoor Temperature) Outline This function is limited only for facilities (the target of air conditioning is equipment (such as computer)). Never use it in a residence or office (the space where there is a human). RX50/60G2V1B, You can expand the operation range to –15°C by turning on the switch (SW4-B) on the service monitor PCB.

  • Page 121: Jumper And Switch Settings

    SiBE041029EC Field Settings Jumper and Switch 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...

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

    Silicon Grease on Power Transistor / Diode Bridge SiBE041029EC 5. 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 123: Part 8 Appendix

    SiBE041029EC Part 8 Appendix 1. Piping Diagrams..................113 1.1 Indoor Unit....................113 1.2 Outdoor Unit ..................113 2. Wiring Diagrams..................115 2.1 Indoor Unit....................115 2.2 Outdoor Unit ..................116 Appendix...

  • Page 124: Piping Diagrams

    Piping Diagrams SiBE041029EC 1. Piping Diagrams Indoor Unit FTX50/60GV1B FTX71GV1B INDOOR UNIT INDOOR UNIT ( 7.9CuT ) ( 7.9CuT ) HEAT EXCHANGER HEAT EXCHANGER THERMISTOR ON HEAT EXCH. THERMISTOR ON HEAT EXCH. CROSS FLOW FAN FIELD PIPING ( 6.4CuT ) CROSS FLOW FAN FIELD PIPING FAN MOTOR...
  • Page 125 SiBE041029EC Piping Diagrams RX50/60G3V1B, RX60G4V1B 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 MUFFLER 7.9 CuT 7.9 CuT 4.0 CuT WITH 7.9 CuT REFRIGERANT FLOW FILTER CAPILLARY TUBE 2...

  • Page 126: Wiring Diagrams

    Wiring Diagrams SiBE041029EC 2. Wiring Diagrams Indoor Unit FTX50/60/71GV1B FIELD WIRING. PCB3 PCB1 RECTIFIER 3.15A OUTDOOR ° CAUTION TRANSMISSION NOTE THAT OPERATION WILL CIRCUIT RESTART AUTOMATICALLY IF PCB4 THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN. LED1 LED2 LED3...

  • Page 127: Outdoor Unit

    SiBE041029EC Wiring Diagrams Outdoor Unit RX50G2V1B Z5C X12A MRM20 POWER SUPPLY 3.15A MRM10 6(P) 7(N) TO INDOOR UNIT X11A 3.15 A PCB1 MRC/W SHEET METAL S101 INDOOR FIELD WIRING t° t° t° S102 PCB2 LED A (OUTDOOR) (DISCHARGE) (CONDENSER) OUTDOOR Z1C~Z5C : FERRITE CORE : TERMINAL STRIP...
  • Page 128 Wiring Diagrams SiBE041029EC RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B 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 FU1, FU2, FU3 : FUSE COOLING ONLY (OUTDOOR) (DISCHARGE) TYPE...

  • Page 129: Revision History

    Revision History Month / Year Version Revised contents 03 / 2010 SiBE041029 First edition 12 / 2012 SiBE041029_A Model addition: RX50/60G3V1B, RX71GV1B9 12 / 2013 SiBE041029EB Model addition: RX71GV1B8 06 / 2015 SiBE041029EC Model addition: RX50/60G2V1B9, RX60G4V1B...
  • Page 130 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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