Daikin FTXM-K Series Service Manual
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Daikin FTXM-K Series Service Manual

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Service
Manual
Inverter Pair
Wall Mounted Type FTXM-K Series
SiBE041434E
[Applied Models]
Inverter Pair : Heat Pump

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Summary of Contents for Daikin FTXM-K Series

  • Page 1 SiBE041434E Service Manual Inverter Pair Wall Mounted Type FTXM-K Series [Applied Models] Inverter Pair : Heat Pump...
  • Page 2 SiBE041434E Inverter Pair Wall Mounted Type FTXM-K Series Heat Pump Indoor Unit FTXM20K3V1B FTXM25K3V1B FTXM35K3V1B FTXM42K3V1B FTXM50K3V1B Outdoor Unit RXM20LV1B RXM25LV1B RXM35LV1B RXM42LV1B RXM50LV1B Table of Contents...

  • Page 3: Table Of Contents

    SiBE041434E 1. Safety Cautions..................v 1.1 Warnings and Cautions Regarding Safety of Workers......v 1.2 Warnings and Cautions Regarding Safety of Users........ xi 2. Used Icons ................... xiv Part 1 List of Functions ..............1 1. Functions....................2 Part 2 Specifications ..............3 1.
  • Page 4 SiBE041434E 3.12 Malfunctions ...................50 Part 5 Remote Controller ............51 1. 20/25 Class ...................52 2. 35/42/50 Class ..................54 Part 6 Service Diagnosis............. 56 1. General Problem Symptoms and Check Items ........57 2. Troubleshooting with LED ..............58 2.1 Indoor Unit....................58 2.2 Outdoor Unit ...................58 3.
  • Page 5 SiBE041434E 5.13 Power Module Check ................106 Part 7 Trial Operation and Field Settings......... 108 1. Pump Down Operation................109 2. Forced Cooling Operation ..............110 3. Trial Operation ..................111 4. Field Settings ..................112 4.1 When 2 Units are installed in 1 Room ..........112 4.2 Model Type Setting ................112 4.3 Facility Setting (cooling at low outdoor temperature) ......113 4.4 Jumper Settings ...................114...

  • Page 6: Safety Cautions

    Safety Cautions SiBE041434E 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 SiBE041434E 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 Safety Cautions SiBE041434E Caution Use the welder in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency. Checking the area Before beginning work, conduct safety checks to minimise the risk of ignition. When repairing the refrigerating system, take the following precautions before work. Work procedure Work shall be conducted under a controlled procedure so as to minimise the risk of working in the presence of R-32 or vapour.
  • Page 9 SiBE041434E Safety Cautions Checking the refrigeration equipment Where electrical components are to be changed, the new components shall be fit for the purpose and have the correct specifications. The manufacturer's maintenance and service guidelines shall be followed at all times. If there are any unclear points, consult the manufacturer's technical department for assistance.
  • Page 10 Safety Cautions SiBE041434E Detecting of R-32 Under no circumstances shall potential sources of ignition be used in the search for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. Leak detection methods The following leak detection methods can be applied for systems containing R-32.
  • Page 11 SiBE041434E Safety Cautions Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its details. It is recommended to train technicians so that all of the refrigerant is recovered safely. In case analysis is required before re-using the reclaimed refrigerant, an oil and refrigerant sample shall be taken before proceeding with decommissioning.

  • Page 12: Warnings And Cautions Regarding Safety Of Users

    Safety Cautions SiBE041434E 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). Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work.
  • Page 13 SiBE041434E Safety Cautions Warning When relocating the equipment, make sure that the new installation site has sufficient strength to withstand the weight of the equipment. If the installation site does not have sufficient strength and if the installation work is not conducted securely, the equipment may fall and cause injury. Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely.
  • Page 14 Safety Cautions SiBE041434E Caution Check the earth / grounding, and repair it if the equipment is not properly earthed / grounded. Improper earth / grounding may cause an electrical shock. Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 MΩ...

  • Page 15: Used Icons

    SiBE041434E 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 16: Part 1 List Of Functions

    SiBE041434E Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 17: Functions

    SiBE041434E Functions 1. Functions Category Functions Category Functions Basic Function Inverter (with inverter power control) Health & Clean Air-purifying filter — — –10 –10 Photocatalytic deodorizing filter — — Operation limit for cooling (°CDB) ~ 46 ~ 46 Air-purifying filter with photocatalytic —...

  • Page 18: Part 2 Specifications

    SiBE041434E Part 2 Specifications 1. Specifications ..................4 Specifications...

  • Page 19: Specifications

    SiBE041434E Specifications 1. Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXM20K3V1B FTXM25K3V1B Model RXM20LV1B RXM25LV1B Outdoor Unit Cooling Heating Cooling Heating 2.0 (1.3 ~ 2.8) 2.5 (1.3 ~ 4.3) 2.5 (1.3 ~ 3.2) 2.8 (1.3 ~ 4.7) Capacity Btu/h 6,800 (4,400 ~ 9,600)
  • Page 20 Specifications SiBE041434E 50 Hz, 220 - 230 - 240 V Indoor Unit FTXM35K3V1B FTXM42K3V1B Model RXM35LV1B RXM42LV1B Outdoor Unit Cooling Heating Cooling Heating 3.5 (1.4 ~ 4.0) 4.0 (1.4 ~ 5.2) 4.2 (1.7 ~ 5.0) 5.4 (1.7 ~ 6.0) Capacity Btu/h 11,900 (4,800 ~ 13,600) 13,600 (4,800 ~ 17,700)
  • Page 21 SiBE041434E Specifications 50 Hz, 220 - 230 - 240 V Indoor Unit FTXM50K3V1B Model RXM50LV1B Outdoor Unit Cooling Heating 5.02 (1.70 ~ 5.30) 5.80 (1.70 ~ 6.50) Capacity Btu/h 17,100 (5,800 ~ 18,100) 19,800 (5,800 ~ 22,200) Rated (Min. ~ Max.) kcal/h 4,300 (1,460 ~ 4,560) 4,990 (1,460 ~ 5,590)

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

    SiBE041434E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................8 1.1 20/25 Class ....................8 1.2 35/42/50 Class ..................10 2. Outdoor Unit..................12 2.1 20/25/35 Class ..................12 2.2 42/50 Class ....................14 Printed Circuit Board Connector Wiring Diagram...

  • Page 23: Indoor Unit

    SiBE041434E Indoor Unit 1. Indoor Unit 20/25 Class Control PCB (PCB1) 1) S6 Connector for swing motor (horizontal blade) 2) S25 Connector for INTELLIGENT EYE sensor PCB 3) S26 Connector for display PCB 4) S32 Connector for indoor heat exchanger thermistor 5) S200 Connector for DC fan motor 6) S403...
  • Page 24 Indoor Unit SiBE041434E Display PCB (PCB2) 1) S27 Connector for control PCB 2) SW1 (S1W) Forced cooling operation ON/OFF button ∗ Refer to page 110 for detail. 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) LED3 (H3P) LED for INTELLIGENT EYE (green) 6) RTH1 (R1T)

  • Page 25: 35/42/50 Class

    SiBE041434E Indoor Unit 35/42/50 Class Control PCB (PCB1) 1) S1 Connector for DC fan motor 2) S21 Connector for centralized control (HA) 3) S25 Connector for INTELLIGENT EYE sensor PCB 4) S32 Indoor heat exchanger thermistor 5) S41 Connector for swing motors 6) S46 Connector for display PCB 7) S47...
  • Page 26 Indoor Unit SiBE041434E Signal Receiver PCB (PCB2) 1) S48 Connector for control PCB 3P210728-1 Display PCB (PCB3) 1) S49 Connector for control PCB 2) SW1 (S1W) Forced cooling operation ON/OFF button ∗ Refer to page 110 for detail. 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow)

  • Page 27: Outdoor Unit

    SiBE041434E Outdoor Unit 2. Outdoor Unit 20/25/35 Class Main PCB (PCB2) 1) S10 Connector for filter PCB 2) S20 Connector for electronic expansion valve coil 3) S40 Connector for overload protector 4) S70 Connector for DC fan motor 5) S80 Connector for four way valve coil 6) S90 Connector for thermistors...
  • Page 28 Outdoor Unit SiBE041434E Filter PCB (PCB1) 1) S11 Connector for main PCB 2) AC1, AC2, S Connector for terminal board 3) E1, E2 Terminal for earth wire 4) HL2, HN2 Connector for main PCB 5) HR1 Connector for reactor 6) FU1 Fuse (3.15 A, 250 V) 7) FU3 Fuse (20 A, 250 V)

  • Page 29: 42/50 Class

    SiBE041434E Outdoor Unit 42/50 Class Main PCB (PCB1) 1) S20 Connector for electronic expansion valve coil 2) S40 Connector for overload protector 3) S70 Connector for DC fan motor 4) S80 Connector for four way valve coil 5) S90 Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) 6) HL1, HN1, S Connector for terminal board...

  • Page 30: Part 4 Function And Control

    SiBE041434E Part 4 Function and Control 1. Main Functions..................16 1.1 Temperature Control ................16 1.2 Frequency Principle................16 1.3 Airflow Direction Control.................18 1.4 Fan Speed Control for Indoor Unit ............20 1.5 Program Dry Operation ................21 1.6 Automatic Operation................22 1.7 Thermostat Control.................23 1.8 NIGHT SET Mode ..................24 1.9 ECONO Operation .................24 1.10 INTELLIGENT EYE Operation (20/25 Class).........25 1.11 2-Area INTELLIGENT EYE Operation (35/42/50 Class) ......26...

  • Page 31: Main Functions

    SiBE041434E Main Functions 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor Target temperature: temperature determined by microcomputer Target temperature Room thermistor temperature...
  • Page 32 Main Functions SiBE041434E 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 33: Airflow Direction Control

    SiBE041434E 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 cooling, dry, and heating operation. (Dual) Flap(s) <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 34 Main Functions SiBE041434E 3-D Airflow 35/42/50 class only Alternative repetition of vertical and horizontal swing motions enables uniform air-conditioning of the entire room. When the horizontal swing and vertical swing are both set to automatic operation, the airflow becomes 3-D airflow. The horizontal and vertical swing motions are alternated and the airflow direction changes in the order shown in the following diagram.

  • Page 35: Fan Speed Control For Indoor Unit

    SiBE041434E 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 36: Program Dry Operation

    Main Functions SiBE041434E 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 37: Automatic Operation

    SiBE041434E 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 38: Thermostat Control

    Main Functions SiBE041434E 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 39: Night Set Mode

    SiBE041434E Main Functions NIGHT SET Mode Outline When the OFF TIMER is set, NIGHT SET Mode is automatically activated. NIGHT SET Mode keeps the airflow rate setting. Detail NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.

  • Page 40: Intelligent Eye Operation (20/25 Class)

    Main Functions SiBE041434E 1.10 INTELLIGENT EYE Operation (20/25 Class) 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 41: 2-Area Intelligent Eye Operation (35/42/50 Class)

    SiBE041434E Main Functions 1.11 2-Area INTELLIGENT EYE Operation (35/42/50 Class) Outline The following functions can be performed by a motion sensor (INTELLIGENT EYE). 1. Reduction of the capacity when there is nobody in the room in order to save electricity (energy saving operation) 2.
  • Page 42 Main Functions SiBE041434E 2. The motions (in cooling) within within 20 min. within 20 min. 20 min. 20 min. Human detection signal ↑ ↑ ↑ Reset Reset Reset Target temperature Remote controller INTELLIGENT EYE button Operation Set speed Set speed Fan speed ( ) (R19414) In FAN operation, the fan speed is reduced by 60 rpm.

  • Page 43: Inverter Powerful Operation

    SiBE041434E Main Functions 1.12 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, the air conditioner can be operated by increasing the indoor fan rotating speed and the compressor frequency. Detail When the POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.

  • Page 44: Clock Setting

    Main Functions SiBE041434E 1.13 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press the Clock button. → is displayed and MON and blink. 2. Press the Select button to set the clock to the current day of the week. 3.

  • Page 45: Weekly Timer Operation

    SiBE041434E 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. Detail 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 46 Main Functions SiBE041434E 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. Programme 1 Programme 2 Programme 3 Programme 4 [Monday] 25˚C 27˚C...

  • Page 47: Function And Control

    SiBE041434E 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 48 Main Functions SiBE041434E 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. Programme 1 Programme 2 Programme 3 Programme 4 [Monday] 25˚C 27˚C...
  • Page 49 SiBE041434E 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 50 Main Functions SiBE041434E 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 51: Other Functions

    SiBE041434E 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 52: Function Of Thermistor

    Function of Thermistor SiBE041434E 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 53: Control Specification

    SiBE041434E 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 54 Control Specification SiBE041434E Detail 1. Determine command frequency Command frequency is determined in the following order of priority. 1. Limiting defrost control time 2. Forced cooling 3. Indoor frequency command 2. Determine upper limit frequency The minimum value is set as an upper limit frequency among the frequency upper limits of the following functions: Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze- up protection, defrost.

  • Page 55: Controls At Mode Changing / Start-Up

    SiBE041434E Control Specification Controls at Mode Changing / Start-up 3.3.1 Preheating Control Outline The inverter operation in open phase starts with the conditions of the preheating command from the indoor unit, the outdoor temperature, the discharge pipe temperature, and the radiation fin temperature.

  • Page 56: Compressor Protection Function

    Control Specification SiBE041434E 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 57: Discharge Pipe Temperature Control

    SiBE041434E Control Specification 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 58: Input Current Control

    Control Specification SiBE041434E 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 59: Freeze-Up Protection Control

    SiBE041434E Control Specification Freeze-up Protection Control During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) The operating frequency limitation is judged with the indoor heat exchanger temperature. Indoor heat exchanger thermistor temperature 13˚C...

  • Page 60: Outdoor Fan Control

    Control Specification SiBE041434E 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 61: Defrost Control

    SiBE041434E Control Specification 3.10 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish defrosting. Detail Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature.

  • Page 62: Electronic Expansion Valve Control

    Control Specification SiBE041434E 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 63: Pressure Equalizing Control

    SiBE041434E Control Specification 3.11.1 Fully Closing with Power ON The electronic expansion valve is initialized when turning on the power. The opening position is set and the pressure is equalized. 3.11.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens and the pressure is equalized.
  • Page 64 Control Specification SiBE041434E 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 65: Malfunctions

    SiBE041434E Control Specification 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction can be detected in the following thermistors: 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Outdoor temperature thermistor 3.12.2 Detection of Overcurrent and Overload Outline An excessive output current is detected and the OL temperature is observed to protect the compressor.

  • Page 66: Part 5 Remote Controller

    SiBE041434E Part 5 Remote Controller 1. 20/25 Class ...................52 2. 35/42/50 Class ..................54 Remote Controller...

  • Page 67: 25 Class

    Refer to the following pages for detail. 1 POWERFUL operation P.28 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 68 4 Auto-swing setting P.18 7 Clock setting 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 69: 42/50 Class

    Refer to the following pages for detail. 1 POWERFUL operation P.28 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 70 4 ECONO operation P.24 7 Clock setting 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 71: Part 6 Service Diagnosis

    SiBE041434E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items ........57 2. Troubleshooting with LED ..............58 2.1 Indoor Unit....................58 2.2 Outdoor Unit ...................58 3. Service Diagnosis .................59 4. Troubleshooting ..................62 4.1 Error Codes and Description ..............62 4.2 Indoor Unit PCB Abnormality ..............63 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......64 4.4 Fan Motor (DC Motor) or Related Abnormality........65 4.5 Thermistor or Related Abnormality (Indoor Unit)........68...

  • Page 72: General Problem Symptoms And Check Items

    General Problem Symptoms and Check Items SiBE041434E 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 73: Troubleshooting With Led

    SiBE041434E 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 74: Service Diagnosis

    Service Diagnosis SiBE041434E 3. Service Diagnosis Method 1 1. When the timer cancel button is held down for 5 seconds, is displayed on the temperature display screen. Timer cancel button (R21282) < ARC466 Series > 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below.
  • Page 75 SiBE041434E Service Diagnosis Method 2 1. Press the center of the Temp button and the Mode button at the same time. (R11669) is displayed on the LCD. (R11821) 2. Select (service check) with the Temp or Temp button. 3. Press the Mode button to enter the service check mode. (R11672) The left-side number blinks.
  • Page 76 Service Diagnosis SiBE041434E 5. Diagnose by the sound. beep: The left-side number does not correspond with the error code. two consecutive beeps: The left-side number corresponds with the error code but the right-side number does not. long beep: Both the left-side and right-side numbers correspond with the error code. (The numbers indicated when you hear the long beep are the error code.

  • Page 77: Troubleshooting

    SiBE041434E 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 78: Indoor Unit Pcb Abnormality

    Troubleshooting SiBE041434E 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 79: Freeze-Up Protection Control / Heating Peak-Cut Control

    SiBE041434E 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 80: Fan Motor (Dc Motor) Or Related Abnormality

    Troubleshooting SiBE041434E 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 81 SiBE041434E Troubleshooting Troubleshooting 20/25 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.03 Note: The motor may break when the Turn off the power supply. motor connector is disconnected Refer to P.98 (Unplug the power cable or turn with the power supply on.
  • Page 82 Troubleshooting SiBE041434E Troubleshooting 35/42/50 class 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.98 voltage. Is the voltage fluctuation Correct the power within ±10% from supply.

  • Page 83: Thermistor Or Related Abnormality (Indoor Unit)

    SiBE041434E Troubleshooting Thermistor or Related Abnormality (Indoor Unit) C4, C9 Error Code Method of Error The temperatures detected by the thermistors determine thermistor errors. Detection Error Decision The voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less during compressor operation.

  • Page 84: Refrigerant Shortage

    Troubleshooting SiBE041434E 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 85 SiBE041434E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Refer to P.97 Any thermistor Replace the thermistor(s) disconnected? position. ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor Check No.12 ∗...

  • Page 86: Low-Voltage Detection Or Over-Voltage Detection

    Troubleshooting SiBE041434E Low-voltage Detection or Over-voltage Detection Error Code Method of Error Indoor Unit Detection The zero-cross detection of the power supply is evaluated by the indoor unit PCB. Outdoor Unit Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit.
  • Page 87 SiBE041434E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the connection of the compressor harness.

  • Page 88: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041434E 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 89 SiBE041434E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Check the power supply voltage. Refer to P.99 Is the Is the voltage fluctuation voltage fluctuation Correct the power supply.

  • Page 90: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiBE041434E 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 91: Outdoor Unit Pcb Abnormality

    SiBE041434E Troubleshooting 4.10 Outdoor Unit PCB Abnormality Error Code Method of Error The system checks if the microprocessor is working in order. Detection The system checks if the zero-cross signal comes in properly. Error Decision The microprocessor program runs out of control. The zero-cross signal is not detected.
  • Page 92 Troubleshooting SiBE041434E Troubleshooting 42/50 class Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. ∗ Before you check the LED A, Turn on the power again. cancel the standby electricity saving function by starting fan operation with the remote controller.

  • Page 93: Ol Activation (Compressor Overload)

    SiBE041434E Troubleshooting 4.11 OL Activation (Compressor Overload) Error Code Method of Error A compressor overload is detected through compressor OL. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Conditions Supposed Disconnection of discharge pipe thermistor...
  • Page 94 Troubleshooting SiBE041434E 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.97 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.99 Check No.

  • Page 95: Compressor Lock

    SiBE041434E Troubleshooting 4.12 Compressor Lock Error Code Method of Error A compressor lock is detected by checking the compressor running condition through the position detection circuit. Detection Error Decision Operation stops due to overcurrent. If the error repeats, the system is shut down. Conditions Reset condition: Continuous run for about 11 minutes without any other error Supposed...

  • Page 96: Dc Fan Lock

    Troubleshooting SiBE041434E 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 about 15 ~ 30 seconds even when the fan motor is running. If the error repeats, the system is shut down.

  • Page 97: Input Overcurrent Detection

    SiBE041434E Troubleshooting 4.14 Input Overcurrent Detection Error Code Method of Error An input overcurrent is detected by checking the input current value with the compressor running. Detection Error Decision The current exceeds about 9.25 ~ 10 A (depending on the model) for 2.5 seconds with the compressor running.

  • Page 98: Four Way Valve Abnormality

    Troubleshooting SiBE041434E 4.15 Four Way Valve Abnormality Error Code Method of Error The room temperature thermistor and the indoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode. Detection Error Decision A following condition continues over 10 minutes after operating for 5 minutes. Conditions <...
  • Page 99 SiBE041434E 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.97 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.100 Harness disconnected? Reconnect the harness.

  • Page 100: Discharge Pipe Temperature Control

    Troubleshooting SiBE041434E 4.16 Discharge Pipe Temperature Control Error Code Method of Error An error is determined with the temperature detected by the discharge pipe thermistor. Detection Error Decision If the temperature detected by the discharge pipe thermistor rises above A°C, the compressor stops.

  • Page 101: High Pressure Control In Cooling

    SiBE041434E Troubleshooting 4.17 High Pressure Control in Cooling Error Code Method of Error High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Detection Error Decision The temperature sensed by the outdoor heat exchanger thermistor rises above 53 ~ 57°C (depending on the model).

  • Page 102: Compressor System Sensor Abnormality

    Troubleshooting SiBE041434E 4.18 Compressor System Sensor Abnormality Error Code Method of Error The system checks the DC current before the compressor starts. Detection Error Decision The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output converted to voltage value).

  • Page 103: Position Sensor Abnormality

    SiBE041434E Troubleshooting 4.19 Position Sensor Abnormality Error Code Method of Error A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes without any other error Conditions Supposed...
  • Page 104 Troubleshooting SiBE041434E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Refer to P.101 Turn off the power. Check the power supply voltage. Check No.18 Refer to P.104 Voltage as rated? Correct the power supply.

  • Page 105: Dc Voltage / Current Sensor Abnormality (20/25/35 Class Only)

    SiBE041434E Troubleshooting 4.20 DC Voltage / Current Sensor Abnormality (20/25/35 Class Only) Error Code Method of Error DC voltage or DC current sensor abnormality is identified based on the compressor running frequency and the input current. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Conditions Supposed...

  • Page 106: Thermistor Or Related Abnormality (Outdoor Unit)

    Troubleshooting SiBE041434E 4.21 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, P4 Error Code Method of Error This fault is identified based on the thermistor input voltage to the microcomputer. A thermistor fault is identified based on the temperature sensed by each thermistor. Detection Error Decision The voltage between the both ends of the thermistor is 4.96 V and more or 0.04 V and less...
  • Page 107 SiBE041434E Troubleshooting Troubleshooting In case of Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Turn on the power again. Refer to P.97 Error displayed Reconnect the connectors again on remote or thermistors.

  • Page 108: Electrical Box Temperature Rise

    Troubleshooting SiBE041434E 4.22 Electrical Box Temperature Rise Error Code Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Detection Error Decision With the compressor off, the radiation fin temperature is above A°C. The error is cleared when the radiation fin temperature drops below B°C.

  • Page 109: Radiation Fin Temperature Rise

    SiBE041434E Troubleshooting 4.23 Radiation Fin Temperature Rise Error Code Method of Error A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on. Detection Error Decision If the radiation fin temperature with the compressor on is above A°C. The error is cleared when the radiation fin temperature drops below B°C.

  • Page 110: Output Overcurrent Detection

    Troubleshooting SiBE041434E 4.24 Output Overcurrent Detection Error Code Method of Error An output overcurrent is detected by checking the current that flows in the inverter DC section. Detection Error Decision A position signal error occurs while the compressor is running. A rotation speed error occurs while the compressor is running.
  • Page 111 SiBE041434E 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.101 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 112: Check

    Check SiBE041434E 5. Check Thermistor Resistance Check Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using a multimeter. The data is for reference purpose only. Resistance (kΩ) Thermistor temperature (°C) Room temperature thermistor Other thermistors of 20/25 class models...

  • Page 113: Fan Motor Connector Output Check

    SiBE041434E Check Fan Motor Connector Output Check Check No.02 35/42/50 class 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 114: Power Supply Waveforms Check

    Check SiBE041434E Power Supply Waveforms Check Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check the waveform disturbance. Check if the power supply waveform is a sine wave (Fig.1). Check if there is waveform disturbance near the zero-cross (sections circled in Fig.2). Fig.1 Fig.2 (R1444)

  • Page 115: Four Way Valve Performance Check

    SiBE041434E Check Four Way Valve Performance Check Check No.13 Turn off the power. Then, turn on the power to restart the system. ∗ Four way valve coil Start heating operation. Cooling / Dry: Not energized Heating: Energized voltage at 220 - 240 Replace the outdoor unit VAC with compressor PCB (main PCB).

  • Page 116: Inverter Analyzer Check

    Check SiBE041434E 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 117: Rotation Pulse Check On The Outdoor Unit Pcb

    SiBE041434E Check 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 118: Installation Condition Check

    Check SiBE041434E 42/50 class Make sure that the voltage of 320 ± 30 V is applied. 1. Set operation off and power off. Disconnect the connector S70. 2. Check that the voltage between the pins 4 - 7 is 320 VDC. 3.

  • Page 119: Discharge Pressure Check

    SiBE041434E Check 5.10 Discharge Pressure Check Check No.18 Discharge pressure check High? Replace the compressor. Is the stop valve open? Open the stop valve. Is the connection pipe Replace the pipe installed at deformed? the site. Is the air filter or indoor / outdoor Replace the compressor.

  • Page 120: Main Circuit Short Check

    Check SiBE041434E 5.12 Main Circuit Short Check Check No.20 Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approximately 0 V before checking. Measure the resistance between the pins of the DB1 referring to the table below. ∞...

  • Page 121: Power Module Check

    SiBE041434E Check 5.13 Power Module Check Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is approximately 0 V before checking. Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.
  • Page 122 Check SiBE041434E 42/50 class DC_P1 Power module (+) DC_N1 Power module (–) (R21204) Service Diagnosis...

  • Page 123: Part 7 Trial Operation And Field Settings

    SiBE041434E Part 7 Trial Operation and Field Settings 1. Pump Down Operation................109 2. Forced Cooling Operation ..............110 3. Trial Operation ..................111 4. Field Settings ..................112 4.1 When 2 Units are installed in 1 Room ..........112 4.2 Model Type Setting ................112 4.3 Facility Setting (cooling at low outdoor temperature) ......113 4.4 Jumper Settings ...................114 5.

  • Page 124: Pump Down Operation

    Pump Down Operation SiBE041434E 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 125: Forced Cooling Operation

    SiBE041434E 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 126: Trial Operation

    Trial Operation SiBE041434E 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 127: Field Settings

    SiBE041434E 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 128: Facility Setting (Cooling At Low Outdoor Temperature)

    Field Settings SiBE041434E 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). Detail You can expand the operation range to –15°C by cutting the jumper on the outdoor unit PCB.

  • Page 129: Jumper Settings

    SiBE041434E Field Settings Jumper Settings Indoor Unit Function Jumper When connected When cut (factory setting) Fan speed setting when Fan speed setting ; The fan stops. compressor stops for Remote controller setting thermostat OFF. (effective only in cooling operation) Power failure recovery Auto-restart The unit does not resume function...

  • Page 130: Silicon Grease On Power Transistor / Diode Bridge

    Silicon Grease on Power Transistor / Diode Bridge SiBE041434E 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 131: Part 8 Appendix

    SiBE041434E Part 8 Appendix 1. Piping Diagrams..................117 1.1 Indoor Unit....................117 1.2 Outdoor Unit ..................119 2. Wiring Diagrams..................120 2.1 Indoor Unit....................120 2.2 Outdoor Unit ..................121 Appendix...

  • Page 132: Piping Diagrams

    Piping Diagrams SiBE041434E 1. Piping Diagrams Indoor Unit FTXM20/25K3V1B Indoor unit Heat exchanger 7.0 CuT 4.8 CuT 7.0 CuT 7.0 CuT Thermistor (heat exchanger) Crossflow fan Field piping (6.4 CuT) Fan motor Field piping 9.5 CuT (9.5 CuT) Refrigerant flow Cooling Heating 4D092170...
  • Page 133 SiBE041434E Piping Diagrams FTXM42/50K3V1B Indoor unit 6.4 CuT Heat exchanger Thermistor (heat exchanger) Crossflow fan Field piping (6.4 CuT) Fan motor Field piping 9.5 CuT (12.7 CuT) Refrigerant flow Cooling Heating 4D092168 Appendix...

  • Page 134: Outdoor Unit

    Piping Diagrams SiBE041434E Outdoor Unit RXM20/25/35LV1B Outdoor unit Heat exchanger 7.0 CuT Outdoor air temperature thermistor 7.0 CuT Heat exchanger thermistor Electronic expansion valve Muffler with filter 4.8 CuT 6.4 CuT 6.4 CuT 4.8 CuT Muffler with filter Propeller fan 9.5 CuT Muffler with filter 4-way valve...

  • Page 135: Wiring Diagrams

    SiBE041434E Wiring Diagrams 2. Wiring Diagrams Indoor Unit FTXM20/25K3V1B PCB1 PCB2 GRN/YLW Transmission circuit LED1 Outdoor C101 C103 MR10 LED2 C102 C104 LED3 Colours 3.15A : Black : White t˚ Indoor IPM200 : Brown : Red : Green 7 10 S403 : Yellow S200...

  • Page 136: Outdoor Unit

    Wiring Diagrams SiBE041434E Outdoor Unit RXM20/25/35LV1B Field wiring Indoor IPM1 MRM20 MRM10 – – C119 – MR30 3.15A – – – 3.15A PCB1 IPM2 PCB2 – – MRCW Outdoor S100 : Insulated Gate Bipolar Transistor(IGBT) 1 4 7 10 11 12 13 X11A : Electronic expansion valve coil : Reversing solenoid valve coil...
  • Page 137 Revision History Month / Year Version Revised contents 02 / 2015 SiBE041434E First edition...
  • Page 138 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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