Daikin FTXR-T Series Service Manual
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Daikin FTXR-T Series Service Manual

Inverter pair
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Service
Manual
Inverter Pair
Wall Mounted Type FTXR-T Series
SiUS041829E
[Applied Models]
Inverter Pair : Heat Pump

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Summary of Contents for Daikin FTXR-T Series

  • Page 1 SiUS041829E Service Manual Inverter Pair Wall Mounted Type FTXR-T Series [Applied Models] Inverter Pair : Heat Pump...

  • Page 2: Table Of Contents

    SiUS041829E Introduction ..................1 1. Safety Cautions...................2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Part 1 General Information ............... 9 1. Applicable Models ..................10 1.1 Heat Pump ....................
  • Page 3 SiUS041829E 3.4 Discharge Pipe Temperature Control............50 3.5 Input Current Control.................. 51 3.6 Freeze-up Protection Control ..............52 3.7 Heating Peak-cut Control ................52 3.8 Outdoor Fan Control................... 53 3.9 Liquid Compression Protection Function............ 53 3.10 Defrost Control ................... 54 3.11 Electronic Expansion Valve Control ............
  • Page 4 SiUS041829E 4.25 Output Overcurrent Detection ..............109 5. Check ......................112 5.1 Thermistor Resistance Check ..............112 5.2 Indoor Fan Motor Connector Check ............113 5.3 Power Supply Waveform Check............... 113 5.4 Electronic Expansion Valve Check............114 5.5 Four Way Valve Performance Check ............115 5.6 Inverter Unit Refrigerant System Check...........

  • Page 5: Introduction

    SiUS041829E Introduction 1. Safety Cautions...................2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Introduction...

  • Page 6: Safety Cautions

    Safety Cautions SiUS041829E 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. This manual is for the person in charge of maintenance and...
  • Page 7 SiUS041829E Safety Cautions Warning Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. Do not turn the air conditioner on or off by plugging in or unplugging the power cable.

  • Page 8: Warnings And Cautions Regarding Safety Of Users

    Safety Cautions SiUS041829E Caution Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns. Conduct welding work in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency.
  • Page 9 SiUS041829E Safety Cautions Warning Do not mix air or gas other than the specified refrigerant (R-32 / R- 410A / R-22) in the refrigerant system. If air enters the refrigerant system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.
  • Page 10 Safety Cautions SiUS041829E Caution Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 M or higher. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause water to enter the room and wet the furniture and floor.

  • Page 11: Icons Used

    SiUS041829E Icons Used 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning Warning is used when there is danger of personal injury. Warning Caution Caution is used when there is danger that the reader, Caution through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part...

  • Page 12: Revision History

    Revision History SiUS041829E 3. Revision History Month/Year Version Revised contents 01 / 2019 SiUS041829E First edition Introduction...

  • Page 13: Part 1 General Information

    SiUS041829E Part 1 General Information 1. Applicable Models ..................10 1.1 Heat Pump ....................10 2. Functions....................11 Part 1 General Information...

  • Page 14: Applicable Models

    Applicable Models SiUS041829E 1. Applicable Models Heat Pump Indoor Unit FTXR09TVJUW FTXR09TVJUS FTXR12TVJUW FTXR12TVJUS FTXR18TVJUW FTXR18TVJUS Outdoor Unit RX09RMVJU9 RX12RMVJU9 RX18RMVJU9 Part 1 General Information...

  • Page 15: Functions

    SiUS041829E Functions 2. Functions Category Functions FTXR Series Basic Function Inverter (with inverter power control)  Operation limit Refer to page PAM control  Swing compressor  Reluctance DC motor  Standby electricity saving — Comfortable Power-airflow dual flaps  Airflow Wide-angle louvers ...
  • Page 16 Functions SiUS041829E Category Functions FTXR Series Remote R/C with back light  Control °F/°C changeover R/C temperature display  (factory setting: °F) Remote control adaptor (normal open pulse Option contact) Remote control adaptor (normal open contact) Option DIII-NET compatible Option Wireless LAN connection Option Wired remote controller...

  • Page 17: Part 2 Specifications

    SiUS041829E Part 2 Specifications 1. Specifications ....................14 Part 2 Specifications...

  • Page 18: Specifications

    Specifications SiUS041829E 1. Specifications Model Indoor Unit FTXR09TVJUW FTXR09TVJUS Outdoor Unit RX09RMVJU9 RX09RMVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Capacity Rated (Min. - Max.) Btu/h 9,000 (4,500 ~ 10,600) 10,000 (4,100 ~ 14,600)
  • Page 19 SiUS041829E Specifications Model Indoor Unit FTXR12TVJUW FTXR12TVJUS Outdoor Unit RX12RMVJU9 RX12RMVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Capacity Rated (Min. - Max.) Btu/h 12,000 (4,500 ~ 12,800) 13,500 (4,100 ~ 15,800)
  • Page 20 Specifications SiUS041829E Model Indoor Unit FTXR18TVJUW FTXR18TVJUS Outdoor Unit RX18RMVJU9 RX18RMVJU9 Cooling Heating Cooling Heating 1  1  Power Supply Phase Hz, V 60 Hz, 208 - 230 V 60 Hz, 208 - 230 V Capacity Rated (Min. - Max.) Btu/h 18,000 (5,100 ~ 18,500) 20,000 (5,800 ~ 21,200)

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

    SiUS041829E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................18 1.1 FTXR09/12/18TVJUW(S)................18 2. Outdoor Unit....................20 2.1 RX09/12RMVJU9 ..................20 2.2 RX18RMVJU9 .................... 21 Part 3 Printed Circuit Board Connector Wiring Diagram...

  • Page 22: Indoor Unit

    Indoor Unit SiUS041829E 1. Indoor Unit FTXR09/12/18TVJUW(S) Control PCB Connector for centralized control (HA) (A1P) Connector for INTELLIGENT EYE sensor PCB (A3P) Indoor heat exchanger thermistor Connector for swing motors Connector for reduction motor (front panel mechanism) and limit switch Connector for display/signal receiver PCB (A2P) S200 Connector for DC fan motor...
  • Page 23 SiUS041829E Indoor Unit Display/Signal Connector for control PCB (A1P) Receiver PCB Connector for room temperature thermistor (A2P) Indoor unit ON/OFF switch (Forced cooling operation ON/OFF switch)  Refer to page 126 for details of forced cooling operation. LED for operation (multi-color) LED for INTELLIGENT EYE (green) Address setting jumper ...

  • Page 24: Outdoor Unit

    Outdoor Unit SiUS041829E 2. Outdoor Unit RX09/12RMVJU9 Main PCB (PCB1) Connector for electronic expansion valve coil Connector for compressor Connector for overload protector Connector for DC fan motor Connector for four way valve coil Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) HL1, HN1, S Connector for terminal block E1, E2...

  • Page 25: Rx18Rmvju9

    SiUS041829E Outdoor Unit RX18RMVJU9 Main PCB Connector for electronic expansion valve coil Connector for overload protector Connector for DC fan motor Connector for four way valve coil Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) HL1, HN1, S Connector for terminal block E1, E2 Terminal for ground...

  • Page 26: Part 4 Functions And Control

    SiUS041829E Part 4 Functions and Control 1. Main Functions..................23 1.1 Temperature Control .................. 23 1.2 Frequency Principle..................23 1.3 Airflow Direction Control................25 1.4 Fan Speed Control for Indoor Unit ............. 26 1.5 Program Dry Operation ................27 1.6 Automatic Cooling/Heating Changeover ............ 28 1.7 Thermostat Control..................

  • Page 27: Main Functions

    SiUS041829E 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 ...
  • Page 28 Main Functions SiUS041829E  When the frequency decreases, the rotation speed of the compressor decreases resulting in a decrease of refrigerant circulation. This leads to a smaller amount of heat exchange per unit. The following drawing shows a schematic view of the inverter principle: Refrigerant circulation rate (high) high speed Amount of heat exchanged air...

  • Page 29: Airflow Direction Control

    SiUS041829E Main Functions Airflow Direction Control Power-Airflow The large flap sends a large volume of air downward to the floor and provides an optimum control in Dual Flaps cooling, dry and heating operation. 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 30: Fan Speed Control For Indoor Unit

    Main Functions SiUS041829E 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 31: Program Dry Operation

    SiUS041829E Main Functions 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. Details 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 32: Automatic Cooling/Heating Changeover

    Main Functions SiUS041829E Automatic Cooling/Heating Changeover Outline 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 33: Thermostat Control

    SiUS041829E Main Functions Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Details Thermostat OFF Conditions  The temperature difference is in the zone A. Thermostat ON Conditions  The temperature difference returns to the zone C after being in the zone A. ...

  • Page 34: Night Set Mode

    Main Functions SiUS041829E NIGHT SET Mode Outline When the OFF TIMER is set, NIGHT SET mode is automatically activated. NIGHT SET mode keeps the airflow rate setting. Details 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 the target temperature slightly in the case of heating.

  • Page 35: Econo Operation

    SiUS041829E Main Functions ECONO Operation Outline ECONO operation reduces the maximum operating current and the power consumption. This operation is particularly convenient for energy-saving. It is also a major bonus when breaker capacity does not allow the use of multiple electrical devices and air conditioners. It can be easily activated by pressing ECONO button on the wireless remote controller.

  • Page 36: 2-Area Intelligent Eye Operation

    Main Functions SiUS041829E 1.10 2-Area INTELLIGENT EYE Operation Outline The following functions can be performed by the microcomputer and a motion sensor. 1. Reduction of the capacity when there is nobody in the room in order to save electricity (energy saving operation) 2.
  • Page 37 SiUS041829E Main Functions 2. Motions (in cooling) within within within 20 min. 20 min. 20 min. 20 min. Human detection signal ↑ ↑ ↑ Reset Reset Reset 1 ~ 2°C (1.8 ~ 3.6 °F) Target temperature Remote controller Sensor button Operation Set speed Set speed...

  • Page 38: Powerful Operation

    Main Functions SiUS041829E 1.11 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. Details When POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.

  • Page 39: Multi-Monitor Lamp/Timer Lamp

    SiUS041829E Main Functions 1.12 Multi-Monitor Lamp/TIMER Lamp Features Current operation mode is displayed in color of the lamp of the indoor unit. Operating status can be monitored even in automatic operation in accordance with the actual operation mode. Multi-monitor lamp/ TIMER lamp (R19925) The lamp color changes according to the operation.

  • Page 40: Clock Setting

    Main Functions SiUS041829E 1.13 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press Clock button.  is displayed, then MON and blink. 2. Press Select or Select button to set the clock to the current day of the week. 3.

  • Page 41: Weekly Timer Operation

    SiUS041829E Main Functions 1.14 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. Details Setting example of the WEEKLY TIMER The same timer settings are used from Monday through Friday, while different timer settings are used for the weekend.
  • Page 42 Main Functions SiUS041829E 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] 77°F (25°C) 81°F (27°C)
  • Page 43 SiUS041829E Main Functions Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10-minute intervals. • To return to the ON/OFF TIMER mode setting, press • Proceed to STEP when setting the OFF TIMER. Press •...
  • Page 44 Main Functions SiUS041829E 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] 77°F (25°C) 81°F (27°C)
  • Page 45 SiUS041829E Main Functions 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 46 Main Functions SiUS041829E To delete reservations An 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 47: Other Functions

    SiUS041829E Main Functions 1.15 Other Functions 1.15.1 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 48: Thermistor Functions

    Thermistor Functions SiUS041829E 2. Thermistor Functions (3) Outdoor (5) Room Temperature Temperature Expansion valve Thermistor Thermistor (2) Outdoor Heat Exchanger Thermistor Four way valve (4) Indoor Heat Exchanger Thermistor Compressor (1) Discharge Pipe Thermistor (R23851) (1) Discharge  The discharge pipe thermistor is used for controlling discharge pipe temperature. If the Pipe Thermistor discharge pipe temperature (used in place of the inner temperature of the compressor) rises abnormally, the operating frequency becomes lower or the operation halts.

  • Page 49: Control Specification

    SiUS041829E 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. Details 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 50: Frequency Control

    Control Specification SiUS041829E 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 (ΔF<0) by PI control, the target frequency is used as the command frequency. Dropping function Input current control, etc.
  • Page 51 SiUS041829E Control Specification D signal for cooling D D D D Temperature Temperature Temperature Temperature difference signal difference signal difference signal difference signal OFF –2.0°C (–3.6°F) 0°C (0°F) 2.0°C (3.6°F) 4.0°C (7.2°F) –1.5°C (–2.7°F) 0.5°C (0.9°F) 2.5°C (4.5°F) 4.5°C (8.1°F) –1.0°C (–1.8°F) 1.0°C (1.8°F) 3.0°C (5.4°F)

  • Page 52: Controls At Mode Changing/Start-Up

    Control Specification SiUS041829E 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. Outdoor temperature ≥...
  • Page 53 SiUS041829E 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 54: Discharge Pipe Temperature Control

    Control Specification SiUS041829E 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.

  • Page 55: Input Current Control

    SiUS041829E 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 the frequency and takes priority over the lower limit control of four way valve operation compensation.

  • Page 56: Freeze-Up Protection Control

    Control Specification SiUS041829E Freeze-up Protection Control Outline During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents freezing of the indoor heat exchanger. The signals from the indoor unit are divided into zones. Details The operating frequency limitation is judged with the indoor heat exchanger temperature.

  • Page 57: Outdoor Fan Control

    SiUS041829E 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 while defrosting.

  • Page 58: Defrost Control

    Control Specification SiUS041829E 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. Details Conditions for Starting Defrost ...

  • Page 59: Electronic Expansion Valve Control

    SiUS041829E 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 60 Control Specification SiUS041829E 3.11.1 Initialization as Power Supply On The electronic expansion valve is initialized (fully closed) when the power is turned on. Then, the valve 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 develops the pressure equalization.
  • Page 61 SiUS041829E 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 62: Malfunctions

    Control Specification SiUS041829E 3.11.8 Target Discharge Pipe Temperature Control The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger temperature, and the electronic expansion valve opening is adjusted so that the actual discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect SH (superheating) control using the discharge pipe temperature) The target discharge pipe temperature is set as to become...

  • Page 63: Part 5 Remote Controller

    SiUS041829E Part 5 Remote Controller 1. Applicable Remote Controller ..............60 2. ARC466A36 ....................61 Part 5 Remote Controller...

  • Page 64: Applicable Remote Controller

    ARC466A36 FTXR18TVJUW(S) Note Refer to the operation manual of applicable model for details. You can download operation manuals from Daikin Business Portal: Daikin Business Portal  Document Search  Item Category  Installation/Operation Manual (URL: https://global1d.daikin.com/business_portal/login/) Part 5 Remote Controller...

  • Page 65: Arc466A36

    SiUS041829E ARC466A36 2. ARC466A36 Signal transmitter Receiver 19-11/16" Display (LCD) (50 cm) or more • Displays the current settings. (In this illustration, each section is shown with all its displays on for the • T o use the remote controller, aim the purpose of explanation.) transmitter at the indoor unit.
  • Page 66 ARC466A36 SiUS041829E Open the Front Cover Mode button • Selects the operation mode. AUTO COOL HEAT 4 Econo / Quiet button • Every time you press Econo/Quiet button, the setting changes in the following order. Lamp brightness ECONO OUTDOOR UNIT setting button QUIET •...

  • Page 67: Part 6 Service Diagnosis

    SiUS041829E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items .........65 2. Troubleshooting with LED .................66 2.1 Indoor Unit....................66 2.2 Outdoor Unit ....................66 3. Service Diagnosis ..................67 3.1 Method 1 ....................67 3.2 Method 2 ....................68 4.
  • Page 68 SiUS041829E 5.6 Inverter Unit Refrigerant System Check........... 115 5.7 Inverter Analyzer Check ................116 5.8 Rotation Pulse Check on the Outdoor Unit PCB ........117 5.9 Installation Condition Check..............118 5.10 Discharge Pressure Check............... 119 5.11 Outdoor Fan System Check ..............119 5.12 Main Circuit Short Check................

  • Page 69: General Problem Symptoms And Check Items

    SiUS041829E General Problem Symptoms and Check Items 1. General Problem Symptoms and Check Items Symptom Check Item Measures Reference Page The unit does not Check the power supply. Check if the rated voltage is supplied. — operate. Check the type of the indoor unit. Check if the indoor unit type is compatible with the —...

  • Page 70: Troubleshooting With Led

    Troubleshooting with LED SiUS041829E 2. Troubleshooting with LED Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected.  A protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions.

  • Page 71: Service Diagnosis

    SiUS041829E Service Diagnosis 3. Service Diagnosis Method 1 1. When Timer Cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen. 2. Press Timer Cancel button repeatedly until a long beep sounds. Timer Cancel button (R24045) <...

  • Page 72: Method 2

    Service Diagnosis SiUS041829E Method 2 1. Press the center of Temp button and Mode button at the same time. (R24046) 5C is displayed on the LCD. (R11821) 2. Select 5C (service check) with Temp or Temp button. 3. Press Mode button to enter the service check mode. (R24047) The left-side number blinks.
  • Page 73 SiUS041829E Service Diagnosis  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. Refer to page 70. 6. Press Mode button. (R24047) The right-side number blinks. (R11673) 7.

  • Page 74: Troubleshooting

    Troubleshooting SiUS041829E 4. Troubleshooting Error Codes and Description Error Reference Description Codes 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 75: Indoor Unit Pcb Abnormality

    SiUS041829E Troubleshooting Indoor Unit PCB Abnormality Error Code Method of Error The system checks if the circuit works properly within the microcomputer of the indoor unit. Detection Error Decision The system cannot set the internal settings. Conditions Supposed  Wrong models interconnected Causes ...
  • Page 76 Troubleshooting SiUS041829E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Combination of the Match the compatible indoor and outdoor unit models. matched? ∗ To secure the connection, Check the connection of disconnect the connectors once connectors.

  • Page 77: Freeze-Up Protection Control/Heating Peak-Cut Control

    SiUS041829E Troubleshooting Freeze-up Protection Control/Heating Peak-cut Control Error Code Method of Error  Freeze-up protection control Detection During cooling operation, the freeze-up protection control (operation halt) is activated 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.) Error Decision...

  • Page 78: Indoor Fan Motor (Dc Motor) Or Related Abnormality

    Troubleshooting SiUS041829E Indoor Fan Motor (DC Motor) or Related Abnormality Error Code Method of Error The rotation speed detected by the Hall IC during indoor fan motor operation determines abnormal Detection fan motor operation. Error Decision The detected rotation speed does not reach the demanded rotation speed of the target tap, and is Conditions less than 50% of the maximum fan motor rotation speed.
  • Page 79 SiUS041829E 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 within ±10% from supply. the rated value? Turn off the power and rotate the fan by hand.
  • Page 80 Troubleshooting SiUS041829E Note The rotation pulse is the feedback signal from the indoor fan motor. Reference Check No.02 Refer to P. 113 Part 6 Service Diagnosis...

  • Page 81: Thermistor Or Related Abnormality

    SiUS041829E Troubleshooting Thermistor or Related Abnormality 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 either 4.96 V or more, or 0.04 V or less with Conditions the power on.

  • Page 82: Front Panel Open/Close Fault

    Troubleshooting SiUS041829E Front Panel Open/Close Fault Error Code Error Decision If the error repeats, the system is shut down. Conditions Supposed  Defective reduction motor Causes  Malfunction or deterioration of the front panel mechanism  Defective limit switch Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.

  • Page 83: Low-Voltage Detection Or Over-Voltage Detection

    SiUS041829E Troubleshooting Low-voltage Detection or Over-voltage Detection Error Code Method of Error Low-voltage detection: 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. Error Decision Low-voltage detection: Conditions...
  • Page 84 Troubleshooting SiUS041829E 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 85: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    SiUS041829E Troubleshooting Signal Transmission Error (Between Indoor Unit and Outdoor Unit) Error Code Method of Error The signal transmission data received from the outdoor unit 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 86 Troubleshooting SiUS041829E 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 within ±10% Correct the power supply. from the rated value? Check the indoor unit - outdoor unit connection wires.

  • Page 87: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    SiUS041829E Troubleshooting Unspecified Voltage (Between Indoor Unit and Outdoor Unit) Error Code Method of Error The supply power is detected for its requirements (pair type is different from multi type) by the indoor/outdoor transmission signal. Detection Error Decision The pair type and multi type are interconnected. Conditions Supposed ...

  • Page 88: Outdoor Unit Pcb Abnormality

    Troubleshooting SiUS041829E 4.10 Outdoor Unit PCB Abnormality Error Code Method of Error  The system checks if the microprocessor is working in order. Detection  The system checks if the zero-cross signal comes in properly. Error Decision  The microprocessor program runs out of control. Conditions ...

  • Page 89: Ol Activation (Compressor Overload)

    SiUS041829E Troubleshooting 4.11 OL Activation (Compressor Overload) Error Code Method of Error A compressor overload is detected through compressor OL. Detection Error Decision  If the error repeats, the system is shut down. Conditions  Reset condition: Continuous run for about 60 minutes without any other error Supposed ...
  • Page 90 Troubleshooting SiUS041829E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Discharge pipe Insert the thermistor in thermistor disconnected? position. Check No. 01 Check the discharge pipe Replace the discharge pipe thermistor.
  • Page 91 SiUS041829E Troubleshooting Reference Check No.14 Refer to P.115 Note When replacing the defective thermistor(s), replace the thermistor as ASSY. Part 6 Service Diagnosis...

  • Page 92: Compressor Lock

    Troubleshooting SiUS041829E 4.12 Compressor Lock Error Code Method of Error A compressor lock is detected by the current waveform generated when applying high-frequency Detection voltage to the motor. Error Decision  If the error repeats, the system is shut down. Conditions ...
  • Page 93 SiUS041829E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. (Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Stop valve Open the stop valve.

  • Page 94: Dc Fan Lock

    Troubleshooting SiUS041829E 4.13 DC Fan Lock Error Code Method of Error An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Detection Error Decision  The fan does not start in 15 ~ 30 seconds even when the fan motor is running. Conditions ...

  • Page 95: Input Overcurrent Detection

    SiUS041829E Troubleshooting 4.14 Input Overcurrent Detection Error Code Method of Error An input overcurrent is detected by checking the input current value with the compressor running. Detection Error Decision The current exceeds about 12.0 ~ 12.5 A (depending on the model) for 2.5 seconds with the Conditions compressor running.
  • Page 96 Troubleshooting SiUS041829E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. ∗ An input overcurrent may result from wrong internal wiring. If the system is interrupted by an input overcurrent after the wires have been disconnected and reconnected for part replacement, check the Check No.

  • Page 97: Four Way Valve Abnormality

    SiUS041829E Troubleshooting 4.15 Four Way Valve Abnormality Error Code Method of Error The room temperature thermistor and the indoor heat exchanger thermistor are checked if they Detection function within their normal ranges in each operation mode. Error Decision The following condition continues over 10 minutes after operating for 5 minutes. Conditions ...
  • Page 98 Troubleshooting SiUS041829E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Four way valve coil disconnected (loose)? Correct the four way valve coil. Harness Reconnect the harness. disconnected? Check the continuity of the four way valve coil and harness.

  • Page 99: Discharge Pipe Temperature Control

    SiUS041829E Troubleshooting 4.16 Discharge Pipe Temperature Control Error Code Method of Error An error is determined with the temperature detected by the discharge pipe thermistor. Detection Error Decision  If the temperature detected by the discharge pipe thermistor rises above A, the compressor Conditions stops.

  • Page 100: High Pressure Control In Cooling

    Troubleshooting SiUS041829E 4.17 High Pressure Control in Cooling Error Code Method of Error High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the Detection temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Error Decision The temperature sensed by the outdoor heat exchanger thermistor rises above 57.5 ~ 60°C (135.5 Conditions ~ 140°F) (depending on the model).
  • Page 101 SiUS041829E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the installation space. Check No. 17 Check the installation Change the installation condition. location or direction. Clean the outdoor heat exchanger.

  • Page 102: System Shutdown Due To Temperature Abnormality In Compressor

    Troubleshooting SiUS041829E 4.18 System Shutdown due to Temperature Abnormality in Compressor Error Code Method of Error Operation is halted when the temperature detected by the discharge pipe thermistor exceeds the determined limit. Detection Error Decision Temperature exceeds the detection threshold of 127.5°C (261.5°F) during forced cooling operation. Conditions Supposed ...

  • Page 103: Compressor System Sensor Abnormality

    SiUS041829E 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 voltage converted from the DC current before compressor start-up is out of the range 0.5 ~ Conditions 4.5 V.

  • Page 104: Position Sensor Abnormality

    Troubleshooting SiUS041829E 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 Detection position detection circuit. Error Decision  If the error repeats, the system is shut down. Conditions ...
  • Page 105 SiUS041829E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Is the power supply voltage fluctuation within Correct the power supply. ±10% from the rated value? Check No.
  • Page 106 Troubleshooting SiUS041829E R6000565 Reference Check No.15 Refer to P.116 Reference Check No.18 Refer to P.119 Reference Check No.20 Refer to P.120 Part 6 Service Diagnosis...

  • Page 107: Dc Voltage/Current Sensor Abnormality

    SiUS041829E Troubleshooting 4.21 DC Voltage/Current Sensor Abnormality Error Code Method of Error DC voltage or DC current sensor abnormality is identified based on the compressor running Detection frequency and the input current. Error Decision  If the error repeats, the system is shut down. Conditions ...

  • Page 108: Thermistor Or Related Abnormality (Outdoor Unit)

    Troubleshooting SiUS041829E 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. Detection A thermistor fault is identified based on the temperature sensed by each thermistor. Error Decision ...
  • Page 109 SiUS041829E Troubleshooting Troubleshooting In case of H9, J3, J6 Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn on the power again. Error displayed Reconnect the connectors again on remote or thermistors.

  • Page 110: Electrical Box Temperature Rise

    Troubleshooting SiUS041829E 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 Detection compressor off. Error Decision  With the compressor off, the radiation fin temperature is above A. Conditions ...

  • Page 111: Radiation Fin Temperature Rise

    SiUS041829E Troubleshooting 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 Detection compressor on. Error Decision  If the radiation fin temperature with the compressor on is above A. Conditions ...
  • Page 112 Troubleshooting SiUS041829E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Then, turn on the power to restart the system. Has the PCB Error displayed Check if silicone grease is been replaced? again?

  • Page 113: Output Overcurrent Detection

    SiUS041829E Troubleshooting 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. Conditions ...
  • Page 114 Troubleshooting SiUS041829E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.
  • Page 115 SiUS041829E Troubleshooting Reference Check No.15 Refer to P.116 Reference Check No.17 Refer to P.118 Reference Check No.18 Refer to P.119 Reference Check No.22 Refer to P.122 Part 6 Service Diagnosis...

  • Page 116: Check

    Check SiUS041829E 5. Check Thermistor Resistance Check Check No.01 Measure the resistance of each thermistor using multimeter. The resistance values are defined by below table. If the measured resistance value does not match the listed value, the thermistor must be replaced. ...

  • Page 117: Indoor Fan Motor Connector Check

    SiUS041829E Check Indoor Fan Motor Connector Check Check No.02 1. Check the connection of connector. 2. Check motor power supply voltage output (pins 4 - 7). 3. Check motor control voltage (pins 4 - 3). 4. Check rotation command voltage output (pins 4 - 2). 5.

  • Page 118: Electronic Expansion Valve Check

    Check SiUS041829E Electronic Expansion Valve Check Check No.12 Conduct the following to check the electronic expansion valve (EV). 1. Check if the EV connector is correctly connected to the PCB. 2. Turn the power off and on again, and check if the EV generates a latching sound. 3.

  • Page 119: Four Way Valve Performance Check

    SiUS041829E Check Four Way Valve Performance Check Check No.13 Turn off the power. Then, turn on the power to restart the system. ∗ Four way valve coil Start heating operation. Cooling/Dry/Defrost: Not energized Heating: energized S80 voltage at 208 - 230 VAC with Replace the outdoor unit compressor on? PCB (main PCB).

  • Page 120: Inverter Analyzer Check

    Check SiUS041829E 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 121: Rotation Pulse Check On The Outdoor Unit Pcb

    SiUS041829E Check  Diagnose method (Diagnose according to 6 LEDs lighting status of the inverter analyzer.) 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 122: Installation Condition Check

    Check SiUS041829E 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 123: Discharge Pressure Check

    SiUS041829E Check 5.10 Discharge Pressure Check Check No.18 Discharge pressure check High? Replace the compressor. Is the stop valve Open the stop valve. open? Is the connection pipe deformed? Replace the pipe installed at the site. Is the air filter or indoor/outdoor heat Replace the compressor.

  • Page 124: Main Circuit Short Check

    Check SiUS041829E 5.12 Main Circuit Short Check Check No.20 Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is about 0 V before checking  Measure the resistance between the pins of the DB1 referring to the table below. ...
  • Page 125 SiUS041829E Check 18 class Multimeter (R25105) Part 6 Service Diagnosis...

  • Page 126: Power Module Check

    Check SiUS041829E 5.13 Power Module Check Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is about 0 V before checking.  Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.
  • Page 127 SiUS041829E Check 18 class DC_P1: + (R20704) DC_N1: – Part 6 Service Diagnosis...

  • Page 128: Part 7 Trial Operation And Field Settings

    SiUS041829E Part 7 Trial Operation and Field Settings 1. Pump Down Operation................125 2. Forced Cooling Operation ...............126 3. Trial Operation ..................127 4. Field Settings ..................129 4.1 Temperature Display Switch ..............129 4.2 When 2 Units are Installed in 1 Room............129 4.3 Jumper and Switch Settings..............

  • Page 129: Pump Down Operation

    SiUS041829E Pump Down Operation 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. Details 1. Remove the valve caps from the liquid stop valve and the gas stop valve. 2.

  • Page 130: Forced Cooling Operation

    Forced Cooling Operation SiUS041829E 2. Forced Cooling Operation Outline The forced cooling operation is allowed when both 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. Protection functions have priority over all other functions during forced cooling operation.

  • Page 131: Trial Operation

    SiUS041829E Trial Operation 3. Trial Operation Outline Trial operation should be carried out in either cooling or heating operation. 1. Measure the supply voltage and make sure that it is within the specified range. 2. In cooling operation, select the lowest programmable temperature; in heating operation, select the highest programmable temperature.
  • Page 132 Trial Operation SiUS041829E Indoor or outdoor unit’s air inlet or air outlet. Incomplete cooling/heating function Stop valves are opened. Incomplete cooling/heating function Indoor unit properly receives remote controller No operation commands. will be displayed when the Mode button is No heating pressed.* Pipes and wires are connected to the corresponding No cooling/heating...

  • Page 133: Field Settings

    SiUS041829E Field Settings 4. Field Settings Temperature Display Switch Procedure  Press the upper side of Temp button and On button at the same time for 5 seconds to change the unit of temperature display. (R22009) 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 address.

  • Page 134: Jumper And Switch Settings

    Field Settings SiUS041829E Wireless Remote 1. Slide down the cover and take it off. Controller 2. Cut the address setting jumper J4.  Be careful not to cut the jumper J8. (R25252) Caution Replace the remote controller if you cut a jumper unintentionally. Jumpers are necessary for electronic circuit.

  • Page 135: Facility Setting (Cooling At Low Outdoor Temperature)

    SiUS041829E Field Settings Facility Setting (cooling at low outdoor temperature) Outline This function is limited only for facilities (the target of air conditioning is equipment such as computers). Never use it in a residence or office (the space where there is a human). Details ...

  • Page 136: Silicone Grease On Power Transistor/Diode Bridge

    Silicone Grease on Power Transistor/Diode Bridge SiUS041829E 5. Silicone Grease on Power Transistor/Diode Bridge Outline Apply the specified silicone grease to the heat radiation part of a power transistor/diode bridge when you replace an outdoor unit PCB. The silicone grease encourages the heat radiation of a power transistor/diode bridge.

  • Page 137: Part 8 Appendix

    SiUS041829E Part 8 Appendix 1. Piping Diagrams..................134 1.1 Indoor Unit....................134 1.2 Outdoor Unit ..................... 135 2. Wiring Diagrams..................136 2.1 Indoor Unit....................136 3. Outdoor Unit....................137 4. Operation Limit..................139 Part 8 Appendix...

  • Page 138: Piping Diagrams

    Piping Diagrams SiUS041829E 1. Piping Diagrams Indoor Unit FTXR09/12TVJUW(S) Indoor unit Heat exchanger thermistor 1/4 CuT Heat exchanger Cross flow fan Field piping 1/4 CuT Fan motor Field piping 3/8 CuT 3/8 CuT Refrigerant flow Cooling Heating 4D101008A FTXR18TVJUW(S) Indoor unit Heat exchanger thermistor 1/4 CuT Heat exchanger...

  • Page 139: Outdoor Unit

    SiUS041829E Piping Diagrams Outdoor Unit RX09/12RMVJU9 3D092207C RX18RMVJU9 3D092220C Part 8 Appendix...

  • Page 140: Wiring Diagrams

    Wiring Diagrams SiUS041829E 2. Wiring Diagrams Indoor Unit FTXR09/12/18TVJUW(S) Wiring diagram : Frame ground : Signal receiver F1U, F2U : Fuse : Ground OUTDOOR H1P, H2P : Pilot lamp H1-H3 : Harness GRN/YLW R1T, R2T : Thermistor MR10 : Magnetic relay GRN/YLW S25-S200 : Connector...

  • Page 141: Outdoor Unit

    SiUS041829E Outdoor Unit 3. Outdoor Unit RX09/12RMVJU9 3D112531A Note(s) PCB1: Main PCB Refer to page 20 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
  • Page 142 Outdoor Unit SiUS041829E RX18RMVJU9 3D105962B Note(s) PCB: Main PCB Refer to page 21 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...

  • Page 143: Operation Limit

    SiUS041829E Operation Limit 4. Operation Limit RX09/12/18RMVJU9 3D092209E Part 8 Appendix...
  • Page 144 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 unauthorized 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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