Daikin FTK(X)M-P Series Service Manual
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Daikin FTK(X)M-P Series Service Manual

Inverter pair wall mounted type
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Service
Manual
Inverter Pair
Wall Mounted Type
FTK(X)M-P Series
SiMT041509E
[Applied Models]
Inverter Pair : Heat Pump

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Summary of Contents for Daikin FTK(X)M-P Series

  • Page 1 SiMT041509E Service Manual Inverter Pair Wall Mounted Type FTK(X)M-P Series [Applied Models] Inverter Pair : Heat Pump...
  • Page 2 SiMT041509E Inverter Pair Wall Mounted Type FTK(X)M-P Series Cooling Only Indoor Unit FTKM18PVMK FTKM24PVMK FTKM28PVMK Outdoor Unit RKM18PVMK RKM24PVMK RKM28PVMK Heat Pump Indoor Unit FTXM18PVMK FTXM24PVMK FTXM28PVMK Outdoor Unit RXM18PVMK RXM24PVMK RXM28PVMK Table of Contents...

  • Page 3: Table Of Contents

    SiMT041509E 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 SiMT041509E Part 5 Remote Controller ............44 1. Remote Controller .................45 Part 6 Service Diagnosis............. 47 1. General Problem Symptoms and Check Items ........48 2. Troubleshooting with LED ..............49 2.1 Indoor Unit....................49 2.2 Outdoor Unit ...................49 3. Service Diagnosis .................50 4.
  • Page 5 SiMT041509E 1.2 Forced Cooling Operation ..............92 2. Trial Operation ..................93 3. Field Settings ..................94 3.1 When 2 Units are Installed in 1 Room............94 3.2 Jumper Settings ..................94 4. Silicon Grease on Power Transistor / Diode Bridge......95 Part 8 Appendix................96 1.

  • Page 6: Safety Cautions

    Safety Cautions SiMT041509E 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 SiMT041509E 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 SiMT041509E 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 SiMT041509E 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 SiMT041509E 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 SiMT041509E 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 SiMT041509E 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 SiMT041509E 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 SiMT041509E 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

    SiMT041509E 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

    SiMT041509E Part 1 List of Functions 1. Functions....................2 List of Functions...

  • Page 17: Functions

    SiMT041509E Functions 1. Functions Category Functions Category Functions Basic Inverter (with inverter power control) Health & Air-purifying filter — — Function Clean 10 ~ 10 ~ Operation limit for cooling (°CDB) Photocatalytic deodorizing filter — — Air-purifying filter with photocatalytic Operation limit for heating (°CWB) —...

  • Page 18: Part 2 Specifications

    SiMT041509E Part 2 Specifications 1. Specifications ..................4 Specifications...

  • Page 19: Specifications

    SiMT041509E Specifications 1. Specifications 50 Hz, 220 - 230 - 240 V / 60 Hz, 220 - 230 V Indoor Unit FTKM18PVMK FTKM24PVMK Model Outdoor Unit RKM18PVMK RKM24PVMK 5.28 (1.7 ~ 6.0) 7.03 (1.9 ~ 8.6) Capacity Btu/h 18,000 (5,700 ~ 20,500) 24,000 (6,500 ~ 29,500) Rated (Min.
  • Page 20 Specifications SiMT041509E 50 Hz, 220 - 230 - 240 V / 60 Hz, 220 - 230 V Indoor Unit FTKM28PVMK Model Outdoor Unit RKM28PVMK 8.21 (1.9 ~ 9.4) Capacity Btu/h 28,000 (6,500 ~ 32,000) Rated (Min. ~ Max.) kcal/h 7,060 (1,640 ~ 8,070) Moisture Removal Running Current (Rated) 10.7 - 10.2 - 9.8 / 10.7 - 10.2...
  • Page 21 SiMT041509E Specifications 50 Hz, 220 - 230 - 240 V / 60 Hz, 220 - 230 V Indoor Unit FTXM18PVMK FTXM24PVMK Model RXM18PVMK RXM24PVMK Outdoor Unit Cooling Heating Cooling Heating 5.28 (1.7 ~ 6.0) 5.42 (1.0 ~ 5.4) 7.03 (1.9 ~ 8.6) 6.33 (1.1 ~ 6.3) Capacity Btu/h...
  • Page 22 Specifications SiMT041509E 50 Hz, 220 - 230 - 240 V / 60 Hz, 220 - 230 V Indoor Unit FTXM28PVMK Model RXM28PVMK Outdoor Unit Cooling Heating 8.21 (1.9 ~ 9.4) 6.57 (1.1 ~ 6.6) Capacity Btu/h 28,000 (6,500 ~ 32,000) 22,400 (3,700 ~ 22,400) Rated (Min.

  • Page 23: Part 3 Printed Circuit Board Connector Wiring Diagram

    SiMT041509E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................9 2. Outdoor Unit..................11 Printed Circuit Board Connector Wiring Diagram...

  • Page 24: Indoor Unit

    Indoor Unit SiMT041509E 1. Indoor Unit 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 25 SiMT041509E Indoor Unit Signal Receiver PCB (PCB2) 1) S48 Connector for control PCB 3P224121-1 Display PCB (PCB3) 1) S49 Connector for control PCB 2) SW1 Forced cooling operation ON/OFF button ∗ Refer to page 92 for detail. 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow)

  • Page 26: Outdoor Unit

    Outdoor Unit SiMT041509E 2. Outdoor Unit Main PCB 1) S20 Connector for electronic expansion valve coil 2) S40 Connector for overload protector and high pressure switch 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)

  • Page 27: Part 4 Function And Control

    SiMT041509E Part 4 Function and Control 1. Main Functions..................13 1.1 Temperature Control ................13 1.2 Frequency Principle................13 1.3 Airflow Direction Control.................15 1.4 Fan Speed Control for Indoor Unit ............16 1.5 Program Dry Operation ................17 1.6 Automatic Operation................18 1.7 Thermostat Control.................19 1.8 NIGHT SET Mode ..................20 1.9 ECONO Operation .................20 1.10 INTELLIGENT EYE Operation ...............21 1.11 Inverter POWERFUL Operation .............22...

  • Page 28: Main Functions

    Main Functions SiMT041509E 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor Target temperature: temperature determined by microcomputer Target temperature Room thermistor temperature...
  • Page 29 SiMT041509E Main Functions The following drawing shows a schematic view of the inverter principle: Refrigerant circulation rate (high) high speed Amount of heat Amount of heat exchanged air (large) exchanged air (large) high f low f Amount of heat Amount of heat exchanged air (small) exchanged air (small) low speed...

  • Page 30: Airflow Direction Control

    Main Functions SiMT041509E Airflow Direction Control Power-Airflow The large flap sends a large volume of air downward to the floor and provides an optimum control in cooling, dry, and heating operation. Dual Flaps <Cooling / Dry> During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room.

  • Page 31: Fan Speed Control For Indoor Unit

    SiMT041509E Main Functions Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.

  • Page 32: Program Dry Operation

    Main Functions SiMT041509E Program Dry Operation Outline Program dry operation removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting buttons are inoperable. Detail The microcomputer automatically sets the temperature and airflow rate. The difference between the room thermistor temperature at start-up and the target temperature is divided into two zones.

  • Page 33: Automatic Operation

    SiMT041509E Main Functions Automatic Operation Outline Automatic Cooling / Heating Function When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.

  • Page 34: Thermostat Control

    Main Functions SiMT041509E Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Detail Thermostat OFF Condition The temperature difference is in the zone A. Thermostat ON Conditions The temperature difference returns to the zone C after being in the zone A. The system resumes from defrost control in any zones except A.

  • Page 35: Night Set Mode

    SiMT041509E Main Functions NIGHT SET Mode Outline When the OFF TIMER is set, NIGHT SET Mode is automatically activated. NIGHT SET Mode keeps the airflow rate setting. Detail NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.

  • Page 36: Intelligent Eye Operation

    Main Functions SiMT041509E 1.10 INTELLIGENT EYE Operation Outline This function detects the presence of humans in the room with a motion sensor (INTELLIGENT EYE) and reduces the capacity when there is nobody in the room in order to save electricity. Detail 1.

  • Page 37: Inverter Powerful Operation

    SiMT041509E Main Functions 1.11 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, the air conditioner can be operated by increasing the indoor fan rotating speed and the compressor frequency. Detail When the POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.

  • Page 38: Clock Setting

    Main Functions SiMT041509E 1.12 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press the Clock button. → is displayed and MON and blink. 2. Press the Select or Select button to set the clock to the current day of the week. 3.

  • Page 39: Weekly Timer Operation

    SiMT041509E Main Functions 1.13 WEEKLY TIMER Operation Outline Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total). The 3 items: ON/OFF, temperature, and time can be set. Detail Setting example of the WEEKLY TIMER The same timer settings are used from Monday through Friday, while different timer settings are used for the weekend.
  • Page 40 Main Functions SiMT041509E 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 41 SiMT041509E 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 42 Main Functions SiMT041509E 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 43 SiMT041509E 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 44 Main Functions SiMT041509E 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 45: Other Functions

    SiMT041509E Main Functions 1.14 Other Functions 1.14.1 Hot-Start Function In order to prevent the cold air blast that normally occurs when heating operation starts, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or significantly weakened resulting in comfortable heating.

  • Page 46: Function Of Thermistor

    Function of Thermistor SiMT041509E 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 47: Control Specification

    SiMT041509E 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 Cooling Only Model Air conditioner control mode Forced operation mode Forced cooling operation (for pump down operation) Power transistor test mode Normal operation mode...

  • Page 48: Frequency Control

    Control Specification SiMT041509E Frequency Control Outline The compressor frequency is determined according to the difference between the room thermistor temperature and the target temperature. When the shift of the frequency is less than zero (∆F<0) by PI control, the target frequency is used as the command frequency. Dropping function Input current control, etc.
  • Page 49 SiMT041509E Control Specification 4. Determine prohibited frequency There is a certain prohibited frequency such as a power supply frequency. When starting the compressor, the frequency is initialized according to the ∆D value of the Initial Frequency indoor unit. <∆D signal: Indoor frequency command> The difference between the room thermistor temperature and the target temperature is recognized as the ∆D signal and is used for frequency command.

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

    Control Specification SiMT041509E 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 51: Discharge Pipe Temperature Control

    SiMT041509E Control Specification 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The function is not activated when defrosting.) (Hz) Frequency (sec.) Time (R13528) A (Hz) B (Hz) C (Hz) D (seconds) E (seconds)

  • Page 52: Input Current Control

    Control Specification SiMT041509E Input Current Control Outline The microcomputer calculates the input current while the compressor is running, and sets the frequency upper limit based on the input current. In case of heat pump models, this control is the upper limit control of frequency and takes priority over the lower limit control of four way valve operation compensation.

  • Page 53: Freeze-Up Protection Control

    SiMT041509E Control Specification Freeze-up Protection Control During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) The operating frequency limitation is judged with the indoor heat exchanger temperature. Indoor heat exchanger thermistor temperature 13˚C...

  • Page 54: Outdoor Fan Control

    Control Specification SiMT041509E Outdoor Fan Control 1. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF. 2. Fan OFF control during defrosting The outdoor fan is turned OFF during defrosting.

  • Page 55: Defrost Control

    SiMT041509E Control Specification 3.10 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish defrosting. Detail Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature.

  • Page 56: Electronic Expansion Valve Control

    Control Specification SiMT041509E 3.11 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2. Pressure equalizing control Open Control 1.
  • Page 57 SiMT041509E 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 develops the pressure equalization.

  • Page 58: Discharge Pipe Thermistor Disconnection Control

    Control Specification SiMT041509E 3.12 Discharge Pipe Thermistor Disconnection Control Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensation temperature. If the discharge pipe thermistor is disconnected, the electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.

  • Page 59: Part 5 Remote Controller

    SiMT041509E Part 5 Remote Controller 1. Remote Controller .................45 Remote Controller...

  • Page 60: Remote Controller

    Refer to the following pages for detail. 1 Inverter POWERFUL operation P.22 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 61 4 ECONO operation P.20 7 Clock setting P.23 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 62: Part 6 Service Diagnosis

    SiMT041509E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items ........48 2. Troubleshooting with LED ..............49 2.1 Indoor Unit....................49 2.2 Outdoor Unit ...................49 3. Service Diagnosis .................50 4. Troubleshooting ..................53 4.1 Error Codes and Description ..............53 4.2 Indoor Unit PCB Abnormality ..............54 4.3 Freeze-up Protection Control / Heating Peak-cut Control ......55 4.4 Fan Motor (DC Motor) or Related Abnormality........56 4.5 Thermistor or Related Abnormality (Indoor Unit)........58...

  • Page 63: General Problem Symptoms And Check Items

    SiMT041509E General Problem Symptoms and Check Items 1. General Problem Symptoms and Check Items Symptom Check Item Details 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 64: Troubleshooting With Led

    Troubleshooting with LED SiMT041509E 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 65: Service Diagnosis

    SiMT041509E Service Diagnosis 3. Service Diagnosis 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature Method 1 display screen. Timer cancel button (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 66 Service Diagnosis SiMT041509E Method 2 1. Press the center of the Temp button and the Mode button at the same time. (R11669) is displayed on the LCD. (R11821) 2. Select 5C (service check) with the Temp or Temp button. 3. Press the Mode button to enter the service check mode. (R11672) The left-side number blinks.
  • Page 67 SiMT041509E Service Diagnosis 5. Diagnose by the sound. beep: The left-side number does not correspond with the error code. two consecutive beeps: The left-side number corresponds with the error code but the right-side number does not. long beep: Both the left-side and right-side numbers correspond with the error code. (The numbers indicated when you hear the long beep are the error code.

  • Page 68: Troubleshooting

    Troubleshooting SiMT041509E 4. Troubleshooting Error Codes and Description Reference Error Codes Description Page System Normal — 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 Freeze-up protection control / heating peak-cut control Fan motor (DC motor) or related abnormality...

  • Page 69: Indoor Unit Pcb Abnormality

    SiMT041509E Troubleshooting Indoor Unit PCB Abnormality Error Code Method of Error The system checks if the circuit works properly within the microcomputer of the indoor unit. Detection Error Decision The system cannot set the internal settings. Conditions Supposed Wrong models interconnected Defective indoor unit PCB Causes Disconnection of connector...

  • Page 70: Freeze-Up Protection Control / Heating Peak-Cut Control

    Troubleshooting SiMT041509E 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 71: Fan Motor (Dc Motor) Or Related Abnormality

    SiMT041509E Troubleshooting Fan Motor (DC Motor) or Related Abnormality Error Code Method of Error The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Detection Error Decision The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
  • Page 72 SiMT041509E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.02 Check the power supply voltage. Refer to P.84 Is the voltage fluctuation Correct the power within ±10% from supply.

  • Page 73: Thermistor Or Related Abnormality (Indoor Unit)

    SiMT041509E 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 74: Low-Voltage Detection Or Over-Voltage Detection

    Troubleshooting SiMT041509E 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 75 SiMT041509E 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 76: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiMT041509E 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 77 SiMT041509E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.11 Refer to P.84 Check the power supply voltage. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the indoor unit - outdoor...

  • Page 78: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)

    Troubleshooting SiMT041509E Unspecified Voltage (Between Indoor Unit and Outdoor Unit) Error Code Method of Error The supply power is detected for its requirements (pair type is different from multi type) by the indoor / outdoor transmission signal. Detection Error Decision The pair type and multi type are interconnected.

  • Page 79: Outdoor Unit Pcb Abnormality

    SiMT041509E Troubleshooting Outdoor Unit PCB Abnormality Error Code Method of Error The system checks if the microprocessor is working in order. The system checks if the zero-cross signal comes in properly. Detection Error Decision The microprocessor program runs out of control. The zero-cross signal is not detected.

  • Page 80: Actuation Of High Pressure Switch

    Troubleshooting SiMT041509E 4.10 Actuation of High Pressure Switch Error Code Method of Error Abnormality is detected when the contact of the high pressure switch opens. Detection Error Decision High pressure switch (S1PH) activating pressure: 4.15 MPa High pressure switch (S1PH) recovery pressure: 3.2 MPa Conditions Supposed Actuation of high pressure switch (S1PH)

  • Page 81: Ol Activation (Compressor Overload)

    SiMT041509E Troubleshooting 4.11 OL Activation (Compressor Overload) Error Code Method of Error A compressor overload is detected through compressor OL. Detection Error Decision OL (Q1L) activating temperature: 130°C OL (Q1L) recovery temperature: 95°C Conditions If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error Supposed Disconnection of discharge pipe thermistor...
  • Page 82 Troubleshooting SiMT041509E 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.83 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.84 Check No.

  • Page 83: Compressor Lock

    SiMT041509E Troubleshooting 4.12 Compressor Lock Error Code Method of Error A compressor lock is detected by the current waveform generated when applying high- frequency voltage to the motor. Detection Error Decision If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes without any other error Conditions Supposed...

  • Page 84: Dc Fan Lock

    Troubleshooting SiMT041509E 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 30 seconds even when the fan motor is running. If the error repeats, the system is shut down.

  • Page 85: Input Overcurrent Detection

    SiMT041509E 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 18.0 A for 2.5 seconds with the compressor running. (The upper limit of the current decreases when the outdoor temperature exceeds a certain Conditions level.)

  • Page 86: Four Way Valve Abnormality

    Troubleshooting SiMT041509E 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. <Cooling / Dry>...
  • Page 87 SiMT041509E 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.83 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.85 Harness disconnected? Reconnect the harness.

  • Page 88: Discharge Pipe Temperature Control

    Troubleshooting SiMT041509E 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 89: Compressor System Sensor Abnormality

    SiMT041509E Troubleshooting 4.17 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 Conditions 0.5 ~ 4.5 V.

  • Page 90: Position Sensor Abnormality

    Troubleshooting SiMT041509E 4.18 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 The compressor fails to start in about 15 seconds after the compressor run command signal is sent.
  • Page 91 SiMT041509E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.15 Turn off the power. Refer to P.86 Check the power supply voltage. Check No.18 Refer to P.88 Voltage as rated? Correct the power supply.

  • Page 92: Thermistor Or Related Abnormality (Outdoor Unit)

    Troubleshooting SiMT041509E 4.19 Thermistor or Related Abnormality (Outdoor Unit) H9 , J3 , J6 , P4 Error Code Method of Error This fault is identified based on the thermistor input voltage to the microcomputer. A thermistor fault is identified based on the temperature sensed by each thermistor. Detection Error Decision The voltage between the both ends of the thermistor is above 4.96 V or below 0.04 V with...
  • Page 93 SiMT041509E Troubleshooting In case of H9 , J3 , J6 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Turn on the power again. Refer to P.83 Error displayed Reconnect the connectors again on remote...

  • Page 94: Electrical Box Temperature Rise

    Troubleshooting SiMT041509E 4.20 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 95: Radiation Fin Temperature Rise

    SiMT041509E Troubleshooting 4.21 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 96: Output Overcurrent Detection

    Troubleshooting SiMT041509E 4.22 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 97 SiMT041509E Troubleshooting 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 Check No.15 overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.

  • Page 98: Check

    Check SiMT041509E 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 multimeter. The data is for reference purpose only. Thermistor temperature (°C) Resistance (kΩ) –20 197.8 –15 148.2...

  • Page 99: Indoor Fan Motor Connector Output Check

    SiMT041509E Check Indoor Fan Motor Connector Output Check Check No.02 1. Check the connection of connector. 2. Check the motor power supply voltage output (pins 4 - 7). 3. Check the motor control voltage (pins 4 - 3). 4. Check the rotation command voltage (pins 4 - 2). 5.

  • Page 100: Four Way Valve Performance Check

    Check SiMT041509E 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 101: Inverter Analyzer Check

    SiMT041509E Check Inverter Analyzer Check Check No.15 Characteristics Inverter analyzer: RSUK0917C If an abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some other failure (main PCB, power module, etc.).

  • Page 102: Rotation Pulse Check On The Outdoor Unit Pcb

    Check SiMT041509E 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 103: Installation Condition Check

    SiMT041509E Check Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air Change the installation suction and location or direction. discharge area. Is the discharged air Change the installation short-circuited? location or direction. Is the outdoor heat Clean the outdoor heat exchanger very dirty? exchanger.

  • Page 104: Outdoor Fan System Check

    Check SiMT041509E 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor Is the lead wire connector outdoor fan running? Go to Check No. 16. disconnected? Reconnect the connector. Outdoor fan system is functioning. (R21195) 5.12 Main Circuit Short Check Check No.20...

  • Page 105: Power Module Check

    SiMT041509E 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 106: Part 7 Trial Operation And Field Settings

    SiMT041509E Part 7 Trial Operation and Field Settings 1. Tips for Servicing ..................92 1.1 Pump Down Operation ................92 1.2 Forced Cooling Operation ..............92 2. Trial Operation ..................93 3. Field Settings ..................94 3.1 When 2 Units are Installed in 1 Room............94 3.2 Jumper Settings ..................94 4.

  • Page 107: Tips For Servicing

    SiMT041509E Tips for Servicing 1. Tips for Servicing Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit. Detail 1. Remove the valve caps from the liquid stop valve and the gas stop valve. 2.

  • Page 108: Trial Operation

    Trial Operation SiMT041509E 2. Trial Operation Outline Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as flap movement, are working properly. Trial operation should be carried out in either cooling or heating operation. Detail 1.

  • Page 109: Field Settings

    SiMT041509E Field Settings 3. Field Settings When 2 Units are Installed in 1 Room Outline When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding wireless remote controller can be set for different addresses. Both the indoor unit PCB and the wireless remote controller need alteration.

  • Page 110: Silicon Grease On Power Transistor / Diode Bridge

    Silicon Grease on Power Transistor / Diode Bridge SiMT041509E 4. Silicon Grease on Power Transistor / Diode Bridge Outline Apply the specified silicon grease to the heat radiation part of a power transistor / diode bridge when you replace an outdoor unit PCB. The silicon grease encourages the heat radiation of a power transistor / diode bridge.

  • Page 111: Part 8 Appendix

    SiMT041509E Part 8 Appendix 1. Piping Diagrams..................97 1.1 Indoor Unit....................97 1.2 Outdoor Unit ...................98 2. Wiring Diagrams..................101 2.1 Indoor Unit....................101 2.2 Outdoor Unit ..................102 Appendix...

  • Page 112: Piping Diagrams

    Piping Diagrams SiMT041509E 1. Piping Diagrams Indoor Unit FTKM18/24PVMK FTKM28PVMK INDOOR UNIT INDOOR UNIT 7.9 CuT 7.9 CuT DISTRIBUTOR DISTRIBUTOR HEAT EXCHANGER HEAT EXCHANGER THERMISTOR THERMISTOR CROSS FLOW FAN CROSS FLOW FAN ON HEAT EXCH. ON HEAT EXCH. FIELD PIPING FIELD PIPING 6.4 CuT 6.4 CuT...

  • Page 113: Outdoor Unit

    SiMT041509E Piping Diagrams Outdoor Unit RKM18PVMK OUTDOOR UNIT HEAT EXCHANGER OUTDOOR TEMPERATURE 7.9 CuT THERMISTOR 7.9 CuT HEAT EXCHANGER (CONDENSER) THERMISTOR MOTOR OPERATED VALVE 7.9 CuT 7.9 CuT 6.4 CuT MUFFLER STRAINER WITH FILTER DC FAN MOTOR PROPELLER FAN RECEIVER 4-WAY VALVE 12.7CuT...
  • Page 114 Piping Diagrams SiMT041509E RKM28PVMK OUTDOOR UNIT HEAT EXCHANGER OUTDOOR TEMPERATURE 7.9 CuT THERMISTOR 7.9 CuT HEAT EXCHANGER (CONDENSER) THERMISTOR MOTOR OPERATED 7.9 CuT VALVE 9.5 CuT 6.4 CuT 6.4 CuT MUFFLER STRAINER MUFFLER 7.9 CuT WITH WITH FILTER FILTER DC FAN MOTOR PROPELLER FAN 4-WAY 12.7 CuT...
  • Page 115 SiMT041509E Piping Diagrams RXM24PVMK OUTDOOR UNIT HEAT EXCHANGER OUTDOOR TEMPERATURE 7.9 CuT THERMISTOR 7.9 CuT HEAT EXCHANGER (CONDENSER) THERMISTOR MOTOR OPERATED 7.9 CuT VALVE 9.5 CuT 6.4 CuT 6.4 CuT 7.9 CuT MUFFLER STRAINER MUFFLER WITH WITH FILTER FILTER DC FAN MOTOR PROPELLER FAN 4-WAY VALVE...

  • Page 116: Wiring Diagrams

    Wiring Diagrams SiMT041509E 2. Wiring Diagrams Indoor Unit FTK(X)M18/24/28PVMK WIRING DIAGRAM PCB3 PCB1 LED1 OUTDOOR 3.15A C102 LED2 MR10 FIELD WIRING. LED3 C101 GRN / YLW TRANSMISSION CAUTION CIRCUIT NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN.

  • Page 117: Outdoor Unit

    SiMT041509E Wiring Diagrams Outdoor Unit RK(X)M18/24/28PVMK IPM1 MRM10 C110 MRM20 INDOOR V401 3.15A GRN/YLW MR30 3.15A S100 FIELD WIRING. POWER SUPPLY X11A 1~220-240V 50/60Hz IN CASE OF > COOLING JUMPER ONLY TYPE ( LOCAL SETTING ) S1PH t˚ t˚ t˚ IN CASE OF NOTE HEAT PUMP...
  • Page 118 Revision History Month / Year Version Revised contents 07 / 2015 SiMT041509E First edition...
  • Page 119 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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