Related Manuals for Daikin FTKM-U Series
Summary of Contents for Daikin FTKM-U Series
- Page 1 SiMX042215E Service Manual Inverter Pair Wall Mounted Type FTKM-U Series [Applied Models] Inverter Pair : Cooling Only...
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Page 2: Table Of Contents
SiMX042215E Introduction ..................1 1. Safety Cautions..................2 1.1 Warnings and Cautions Regarding Safety of Workers......2 1.2 Warnings and Cautions Regarding Safety of Users.........8 2. Icons Used ....................10 3. Revision History ..................11 Part 1 General Information ............12 1. Applicable Models .................13 2. - Page 3 SiMX042215E 3.9 Electronic Expansion Valve Control ............42 3.10 Malfunctions ...................45 Part 5 Remote Controller ............. 46 1. Applicable Remote Controller ...............47 2. ARC484B41 ..................48 Part 6 Service Diagnosis .............. 49 1. General Problem Symptoms and Check Items ........51 2. Troubleshooting with LED ..............52 2.1 Indoor Unit....................52 2.2 Outdoor Unit ...................52 3.
- Page 4 SiMX042215E 5.9 Discharge Pressure Check..............96 5.10 Outdoor Fan System Check ..............97 5.11 Main Circuit Short Check................97 5.12 Power Module Check ................99 Part 7 Trial Operation and Field Settings ........101 1. Pump Down Operation................102 2. Forced Cooling Operation ..............103 3. Trial Operation ..................104 4.
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Page 5: Introduction
SiMX042215E Introduction 1. Safety Cautions..................2 1.1 Warnings and Cautions Regarding Safety of Workers......2 1.2 Warnings and Cautions Regarding Safety of Users.........8 2. Icons Used ....................10 3. Revision History ..................11 Introduction... -
Page 6: Safety Cautions
Safety Cautions SiMX042215E 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 SiMX042215E Safety Cautions Warning Do not turn the air conditioner on or off by plugging in or unplugging the power cable. Plugging in or unplugging the power cable 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 in a high place (more than 2 m).
- Page 8 Safety Cautions SiMX042215E 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 SiMX042215E Safety Cautions Checking electrical devices Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. In case there is any fault that could endanger safety, no electrical supply shall be connected to the circuit until the fault is satisfactorily dealt with. Initial safety checks shall include: ...
- Page 10 Safety Cautions SiMX042215E Leak detection methods The following leak detection methods can be applied for systems containing R-32. Electronic leak detectors shall be used to detect R-32, but the sensitivity may not be adequate or may need re-calibration (detection equipment shall be calibrated in a refrigerant-free area).
- Page 11 SiMX042215E 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.
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Page 12: Warnings And Cautions Regarding Safety Of Users
Safety Cautions SiMX042215E Warnings and Cautions Regarding Safety of Users Warning Do not store the equipment in a room with fire sources (e.g., naked flames, gas appliances, electric heaters). Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work. - Page 13 SiMX042215E Safety Cautions Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely. If the plug is dusty or has a loose connection, it may cause an electrical shock or fire.
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Page 14: Icons Used
Icons Used SiMX042215E 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning Warning is used when there is danger of personal injury. Warning Caution Caution is used when there is danger that the reader, Caution through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part... -
Page 15: Revision History
SiMX042215E Revision History 3. Revision History Month/Year Version Revised contents 07 / 2022 SiMX042215E First edition Introduction... -
Page 16: Part 1 General Information
SiMX042215E Part 1 General Information 1. Applicable Models .................13 2. Functions....................14 Part 1 General Information... -
Page 17: Applicable Models
SiMX042215E Applicable Models 1. Applicable Models Indoor Unit Outdoor Unit FTKM12UVLWZ RKMG12UVLWZ FTKM18UVLVZ RKMG18UVLVZ FTKM24UVLUZ RKMG24UVLUZ Part 1 General Information... -
Page 18: Functions
Functions SiMX042215E 2. Functions Category Functions 12/18 class 24 class Technology Inverter (with inverter power control) Operation limit Refer to page 114 PAM control — Indoor fan motor Outdoor fan motor Compressor Swing compressor Reluctance DC motor ... -
Page 19: Part 2 Specifications
SiMX042215E Part 2 Specifications 1. Specifications ..................16 Part 2 Specifications... -
Page 20: Specifications
Specifications SiMX042215E 1. Specifications Indoor Unit FTKM12UVLWZ FTKM18UVLVZ Model Outdoor Unit RKMG12UVLWZ RKMG18UVLVZ 1 , 60 Hz, 220 V 1 , 60 Hz, 220 V Power Supply Capacity 3.52 (1.09 ~ 4.0) 5.0 (1.75 ~ 5.4) Rated (Min. ~ Max.) Btu/h 12,000 (3,720 ~ 13,650) 17,100 (6,000 ~ 18,400) - Page 21 SiMX042215E Specifications Indoor Unit FTKM24UVLUZ Model Outdoor Unit RKMG24UVLUZ 1 , 60 Hz, 220 V Power Supply Capacity 6.6 (1.75 ~ 7.0) Rated (Min. ~ Max.) Btu/h 22,500 (6,000 ~ 23,900) kcal/h 5,680 (1,500 ~ 6,020) Moisture Removal Running Current (Rated) 10.45 Power Consumption 2,185 (210 ~ 2,250)
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Page 22: Part 3 Printed Circuit Board Connector Wiring Diagram
SiMX042215E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit.....................19 2. Outdoor Unit..................21 2.1 12 Class ....................21 2.2 18 Class ....................22 2.3 24 Class ....................23 Part 3 Printed Circuit Board Connector Wiring Diagram... -
Page 23: Indoor Unit
SiMX042215E Indoor Unit 1. Indoor Unit Control PCB Connector for swing motor (horizontal blade) (A1P) Connector for swing motor (vertical blade) Connector for display/signal receiver PCB (A2P) Connector for indoor heat exchanger thermistor (R2T) Connector for high voltage power supply PCB (streamer unit) S200 Connector for DC fan motor H1, H2, H3, FG... - Page 24 Indoor Unit SiMX042215E Display/Signal Connector for control PCB (A1P) Receiver PCB Indoor unit ON/OFF switch (A2P) (Forced cooling operation ON/OFF switch) Refer to page 103 for details of forced cooling operation. LED for operation (green) LED for timer (yellow) Room temperature thermistor (Solder side) 3P456555-2 High Voltage...
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Page 25: Outdoor Unit
SiMX042215E Outdoor Unit 2. Outdoor Unit 12 Class Main PCB (PCB1) S10, S Wire harness for terminal strip Connector for electronic expansion valve coil Connector for compressor Connector for overload protector Connector for DC fan motor Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) Wire harness for earth wire HR1, HR2 Connector for reactor... -
Page 26: Class
Outdoor Unit SiMX042215E 18 Class Main PCB (PCB1) S10, S Connector for terminal strip Connector for electronic expansion valve coil Connector for compressor Connector for overload protector Connector for DC fan motor Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) Connector for earth wire HR1, HR2 Connector for reactor... -
Page 27: Class
SiMX042215E Outdoor Unit 24 Class Main PCB (PCB1) Connector for electronic expansion valve coil Connector for overload protector Connector for clamp PCB (PCB2) Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) HL1, HN1, S Wire harness for terminal block E1, E2 Wire harness for earth wire U, V, W... - Page 28 Outdoor Unit SiMX042215E Clamp PCB Connector for main PCB (PCB1) (PCB2) Connector for DC fan motor V160 Varistor V160 3P363743-1 Part 3 Printed Circuit Board Connector Wiring Diagram...
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Page 29: Part 4 Functions And Control
SiMX042215E Part 4 Functions and Control 1. Main Functions..................26 1.1 Temperature Control ................26 1.2 Frequency Principle................26 1.3 Airflow Direction Control.................28 1.4 Fan Speed Control for Indoor Unit ............29 1.5 COANDA Operation ................29 1.6 Program Dry Operation ................30 1.7 Thermostat Control.................31 1.8 GOOD SLEEP OFF TIMER ..............31 1.9 SMELL PROOF Operation ..............31 1.10 Flash Streamer Air Purifying Operation..........32... -
Page 30: Main Functions
Main Functions SiMX042215E 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures Room temperature: temperature of lower part of the room Set temperature: temperature set by remote controller Room thermistor temperature: temperature detected by room temperature thermistor ... - Page 31 SiMX042215E 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...
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Page 32: Airflow Direction Control
Main Functions SiMX042215E 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 and dry operation. Dual Flaps Cooling/Dry During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room. -
Page 33: Fan Speed Control For Indoor Unit
SiMX042215E Main Functions Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 7 steps: SL, L, ML, M, MH, H, and HH (POWERFUL). The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature. -
Page 34: Program Dry Operation
Main Functions SiMX042215E Program Dry Operation Outline Program dry operation removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting buttons are inoperable. Details The microcomputer automatically sets the temperature and airflow rate. The difference between the room thermistor temperature at start-up and the target temperature is divided into two zones. -
Page 35: Thermostat Control
SiMX042215E Main Functions Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Details 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. ... -
Page 36: Flash Streamer Air Purifying Operation
Main Functions SiMX042215E 1.10 Flash Streamer Air Purifying Operation Outline The absorption power of the accessory filter and the decomposition power of the streamer discharge combine to reduce unpleasant odors and viruses, cleaning the air in the room. Operation STREAMER button R4003865 To start the operation:... -
Page 37: Econo Operation
SiMX042215E Main Functions 1.11 ECONO Operation Outline ECONO operation reduces the maximum operating current and the power consumption. This operation is particularly convenient for energy-saving. It is also a major bonus when breaker capacity does not allow the use of multiple electrical devices and air conditioners. It can be easily activated by pressing ECONO button on the wireless remote controller. -
Page 38: Dew Clean Operation
Main Functions SiMX042215E 1.13 Dew Clean Operation Outline This function helps to clean accumulation of dust and stain on indoor heat exchanger. The dew clean operation is available in both cooling and dry operation. For better cooling performance, recommended to run once in a month. Details ... -
Page 39: Default Set Temperature Setting
SiMX042215E Main Functions 1.14 Default Set Temperature Setting Outline As per BEE regulation, whenever the air conditioner will be switched ON from the remote controller, the default set temperature will be set as follows: Previously switched OFF After switched ON again If set temperature <... -
Page 40: Thermistor Functions
Thermistor Functions SiMX042215E 2. Thermistor Functions (5) Room (3) Outdoor Temperature Temperature Expansion valve Thermistor Thermistor (2) Outdoor Heat (4) Indoor Heat Exchanger Exchanger Thermistor Thermistor (1) Discharge Pipe Thermistor Compressor (R23850) (1) Discharge The discharge pipe thermistor is used for controlling discharge pipe temperature. If the Pipe Thermistor discharge pipe temperature (used in place of the inner temperature of the compressor) rises abnormally, the operating frequency becomes lower or the operation halts. -
Page 41: Control Specification
SiMX042215E Control Specification 3. Control Specification Mode Hierarchy Outline The air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing. Details Air conditioner control mode Forced operation mode Forced cooling operation (for pump down operation) Power transistor test mode Normal operation mode Cooling (includes drying) - Page 42 Control Specification SiMX042215E 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 taken as the D value and is used for D signal of frequency command.
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Page 43: Controls At Mode Changing/Start-Up
SiMX042215E Control Specification Controls at Mode Changing/Start-up 3.3.1 3-Minute Standby Turning on the compressor is prohibited for 3 minutes after turning off. 3.3.2 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (Hz) Frequency (sec.) -
Page 44: Input Current Control
Control Specification SiMX042215E 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. Details Compressor Stop Stop zone Dropping zone Keep zone Input current Reset zone (R23249) Frequency control in each zone... -
Page 45: Freeze-Up Protection Control
SiMX042215E Control Specification Freeze-up Protection Control Outline During cooling operation, the signals sent from the indoor unit control the operating frequency limitation and prevent freezing of the indoor heat exchanger. The signal from the indoor unit is divided into zones. Details The operating frequency limitation is judged with the indoor heat exchanger temperature. -
Page 46: Liquid Compression Protection Function
Control Specification SiMX042215E Liquid Compression Protection Function Outline In order to increase the dependability of the compressor, the compressor is stopped according to the outdoor temperature. Details Operation stops depending on the outdoor temperature. The compressor turns off under the conditions that the system is in cooling operation and outdoor temperature is below A°C. - Page 47 SiMX042215E Control Specification 3.9.1 Initialization as Power Supply On The electronic expansion valve is initialized (fully closed) when the power is turned on. Then, the valve opening position is set and the pressure is equalized. 3.9.2 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 48 Control Specification SiMX042215E 3.9.8 Discharge Pipe Thermistor Disconnection Control Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensing temperature. If the discharge pipe thermistor is disconnected, operates for a specified time, and then stops. After 3 minutes, the operation restarts and checks if the discharge pipe thermistor is disconnected.
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Page 49: Malfunctions
SiMX042215E Control Specification 3.10 Malfunctions 3.10.1 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 3.10.2 Detection of Overcurrent and Overload Outline In order to protect the inverter, an excessive output current is detected and the OL temperature is observed to protect the compressor. -
Page 50: Part 5 Remote Controller
SiMX042215E Part 5 Remote Controller 1. Applicable Remote Controller ...............47 2. ARC484B41 ..................48 Part 5 Remote Controller... -
Page 51: Applicable Remote Controller
SiMX042215E Applicable Remote Controller 1. Applicable Remote Controller Model Name Remote Controller Reference Page FTKM12UVLWZ FTKM18UVLVZ ARC484B41 FTKM24UVLUZ Part 5 Remote Controller... -
Page 52: Arc484B41
ARC484B41 SiMX042215E 2. ARC484B41 Signal transmitter Display (LCD) • Displays the current settings. (In this illustration, each section is shown with all its displays on for the purpose of explanation.) ON/OFF button • Press this button once to start Receiver operation. -
Page 53: Part 6 Service Diagnosis
SiMX042215E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items ........51 2. Troubleshooting with LED ..............52 2.1 Indoor Unit....................52 2.2 Outdoor Unit ...................52 3. Service Diagnosis .................53 3.1 Method 1 ....................53 3.2 Method 2 ....................54 4. Troubleshooting ..................56 4.1 Error Codes and Description ..............56 4.2 Indoor Unit PCB Abnormality ..............57 4.3 Freeze-up Protection Control ..............58... - Page 54 SiMX042215E 5.9 Discharge Pressure Check..............96 5.10 Outdoor Fan System Check ..............97 5.11 Main Circuit Short Check................97 5.12 Power Module Check ................99 Part 6 Service Diagnosis...
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Page 55: General Problem Symptoms And Check Items
SiMX042215E 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 —... -
Page 56: Troubleshooting With Led
Troubleshooting with LED SiMX042215E 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 57: Service Diagnosis
SiMX042215E Service Diagnosis 3. Service Diagnosis Method 1 1. When TIMER CANCEL button is held down for 5 seconds, 00 is displayed on the temperature display screen. 2. Press TIMER CANCEL button repeatedly until a long beep sounds. TIMER CANCEL button <ARC484 Series>... -
Page 58: Method 2
Service Diagnosis SiMX042215E Method 2 1. Press the TEMP up or TEMP down button and MODE button at the same time to enter the service check mode. (R14572) The left-side number blinks. (R25244) 2. Press TEMP up or TEMP down button and change the number until you hear the two consecutive beeps or the long beep. - Page 59 SiMX042215E Service Diagnosis 5. Press TEMP up or TEMP down button and change the number until you hear the long beep. (R14573) 6. Diagnose by the sound. Beep: The left-side number does not correspond with the error code. Two consecutive beeps: The left-side number corresponds with the error code but the right-side number does not.
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Page 60: Troubleshooting
Troubleshooting SiMX042215E 4. Troubleshooting Error Codes and Description Error Reference Description Codes Page System Normal — U0 Refrigerant shortage Low-voltage detection or over-voltage detection Signal transmission error (between indoor unit and outdoor unit) Unspecified voltage (between indoor unit and outdoor unit) Indoor Indoor unit PCB abnormality... -
Page 61: Indoor Unit Pcb Abnormality
SiMX042215E Troubleshooting Indoor Unit PCB Abnormality Error Code Method of Error The system checks if the circuit works properly within the microcomputer of the indoor unit. Detection Error Decision The system cannot set the internal settings. Conditions Supposed Wrong models interconnected Causes ... -
Page 62: Freeze-Up Protection Control
Troubleshooting SiMX042215E Freeze-up Protection Control Error Code Method of Error During cooling operation, the freeze-up protection control (operation halt) is activated according Detection to the temperature detected by the indoor heat exchanger thermistor. Error Decision During cooling operation, the indoor heat exchanger temperature is below 0°C. Conditions Supposed ... -
Page 63: Indoor Fan Motor (Dc Motor) Or Related Abnormality
SiMX042215E Troubleshooting Indoor Fan Motor (DC Motor) or Related Abnormality Error Code Method of Error The rotation speed detected by the microcomputer during fan motor operation is used to Detection determine abnormal fan motor operation. The fan motor stops its rotation within 5 seconds after the operation starts. Error Decision The detected rotation speed does not reach the demanded rotation speed of the target tap, and Conditions... - Page 64 Troubleshooting SiMX042215E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Note: The motor may break when the Turn off the power supply. motor connector is disconnected (Unplug the power cable or turn with the power supply on.
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Page 65: Thermistor Or Related Abnormality (Indoor Unit)
SiMX042215E 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 either 4.96 V or more, or 0.04 V or less Conditions with the power on. -
Page 66: Refrigerant Shortage
Troubleshooting SiMX042215E Refrigerant Shortage Error Code Method of Error Refrigerant shortage detection I: Detection Refrigerant shortage is detected by checking the input current value and the compressor running frequency. If there is insufficient refrigerant, the input current tends to be lower than the normal value. - Page 67 SiMX042215E Troubleshooting Supposed Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor, Causes room or outdoor temperature thermistor Closed stop valve Refrigerant shortage (refrigerant leakage) Poor compression performance of compressor Defective electronic expansion valve (electronic expansion valve type model only) Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution...
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Page 68: Low-Voltage Detection Or Over-Voltage Detection
Troubleshooting SiMX042215E 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 69 SiMX042215E 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.
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Page 70: Signal Transmission Error (Between Indoor Unit And Outdoor Unit)
Troubleshooting SiMX042215E Signal Transmission Error (Between Indoor Unit and Outdoor Unit) Error Code Method of Error The signal transmission data received from the outdoor unit is checked whether it is normal. Detection Error Decision The data sent from the outdoor unit cannot be received normally, or the content of the data is Conditions abnormal. - Page 71 SiMX042215E 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 wires between the indoor unit and the outdoor unit.
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Page 72: Unspecified Voltage (Between Indoor Unit And Outdoor Unit)
Troubleshooting SiMX042215E 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. Conditions Supposed ... -
Page 73: Outdoor Unit Pcb Abnormality
SiMX042215E Troubleshooting 4.10 Outdoor Unit PCB Abnormality Error Code Method of Error The system checks if the microcomputer is working in order. Detection The system checks if the zero-cross signal comes in properly. Error Decision The microcomputer program runs out of control. Conditions ... -
Page 74: Ol Activation (Compressor Overload)
Troubleshooting SiMX042215E 4.11 OL Activation (Compressor Overload) Error Code Method of Error A compressor overload is detected through compressor OL. Detection Error Decision If the error repeats, the system is shut down. Conditions Reset condition: Continuous run for about 60 minutes without any other error Supposed ... - Page 75 SiMX042215E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No. 01 Replace the discharge pipe Check the discharge pipe thermistor.
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Page 76: Compressor Lock
Troubleshooting SiMX042215E 4.12 Compressor Lock Error Code Method of Error A compressor lock is detected by the current waveform generated when applying Detection high-frequency voltage to the motor. Error Decision If the error repeats, the system is shut down. Conditions ... -
Page 77: Dc Fan Lock
SiMX042215E Troubleshooting 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 ~ 60 seconds (depending on the model) even when the Conditions fan motor is running. -
Page 78: Input Overcurrent Detection
Troubleshooting SiMX042215E 4.14 Input Overcurrent Detection Error Code Method of Error An input overcurrent is detected by checking the input current value with the compressor Detection running. Error Decision The current exceeds 7 ~ 10 A (depending on the model) for 2.5 seconds with the compressor Conditions running. -
Page 79: Discharge Pipe Temperature Control
SiMX042215E Troubleshooting 4.15 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 Conditions compressor stops. - Page 80 Troubleshooting SiMX042215E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No. 01 Replace the defective Check the thermistors. ∗ Discharge pipe thermistor thermistor(s). ∗ Outdoor heat exchanger thermistor ∗...
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Page 81: High Pressure Control In Cooling
SiMX042215E Troubleshooting 4.16 High Pressure Control in Cooling Error Code Method of Error High-pressure control (operation halt, frequency drop, etc.) is activated in cooling mode if the Detection temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Error Decision ... - Page 82 Troubleshooting SiMX042215E Reference Check No.12 Refer to P.92 Reference Check No.17 Refer to P.96 Reference Check No.18 Refer to P.96 Reference Check No.19 Refer to P.97 Part 6 Service Diagnosis...
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Page 83: System Shutdown Due To Temperature Abnormality In Compressor
SiMX042215E Troubleshooting 4.17 System Shutdown due to Temperature Abnormality in Compressor Error Code Method of Error Operation is halted when the temperature detected by the discharge pipe thermistor exceeds Detection the determined limit. Error Decision Temperature exceeds the detection threshold of 127.5°C during forced cooling operation. Conditions Supposed ... -
Page 84: Compressor System Sensor Abnormality
Troubleshooting SiMX042215E 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 voltage converted from the DC current before compressor start-up is out of the range Conditions 0.5 ~ 4.5 V. -
Page 85: Position Sensor Abnormality
SiMX042215E Troubleshooting 4.19 Position Sensor Abnormality Error Code Method of Error A compressor start-up failure is detected by the current waveform generated when applying Detection high frequency voltage to the motor. Error Decision The compressor fails to start in about 15 seconds after the compressor run command signal Conditions is sent. - Page 86 Troubleshooting SiMX042215E Continued from the previous page Check the connection. Electrical components or compressor harnesses Reconnect the electrical connected as components or compressor specified? harnesses as specified. Turn on the power. Check the capacitor voltage. + 100 Within 320 VDC? Replace the outdoor unit - 50 PCB (main PCB).
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Page 87: Dc Voltage/Current Sensor Abnormality
SiMX042215E Troubleshooting 4.20 DC Voltage/Current Sensor Abnormality Error Code Method of Error DC voltage or DC current sensor abnormality is identified based on the compressor running Detection frequency and the input current. Error Decision If the error repeats, the system is shut down. Conditions ... -
Page 88: Thermistor Or Related Abnormality (Outdoor Unit)
Troubleshooting SiMX042215E 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. Detection A thermistor fault is identified based on the temperature sensed by each thermistor. Error Decision ... -
Page 89: Electrical Box Temperature Rise
SiMX042215E Troubleshooting 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 Detection compressor off. Error Decision With the compressor off, the radiation fin temperature is above A °C. Conditions ... -
Page 90: Radiation Fin Temperature Rise
Troubleshooting SiMX042215E 4.23 Radiation Fin Temperature Rise Error Code Method of Error A radiation fin temperature rise is detected by checking the radiation fin temperature with the Detection compressor on. Error Decision The radiation fin temperature with the compressor on is above A °C. Conditions ... -
Page 91: Output Overcurrent Detection
SiMX042215E Troubleshooting 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. Conditions ... - Page 92 Troubleshooting SiMX042215E Continued from the previous page Any LED off? Correct the power supply or replace the outdoor unit PCB (main PCB). Check No. 22 Check the power module. Normal? Replace the outdoor unit PCB (main PCB). Turn off the power, and reconnect the harnesses.
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Page 93: Error Codes None
SiMX042215E Troubleshooting 4.25 Error Codes None Error Code None Possible error ■ Over-voltage detection detection ■ OL Activation (compressor overload) Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the breaker and turn on the breaker again. -
Page 94: Check
Check SiMX042215E 5. Check Thermistor Resistance Check Check No.01 Measure the resistance of each thermistor using multimeter. The resistance values are defined by below table. If the measured resistance value does not match the listed value, the thermistor must be replaced. -
Page 95: Indoor Fan Motor Connector Check
SiMX042215E Check Indoor Fan Motor Connector Check Check No.03 Fan motor wire breakdown/short circuit check (1) Check the connector for connection. (2) Turn the power off. (3) Check if each resistance at the phases U - V and V - W is within specified range in the table below. -
Page 96: Power Supply Waveform Check
Check SiMX042215E Power Supply Waveform Check Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal strip, and check the waveform disturbance. Check if the power supply waveform is a sine wave (Fig.1). ... -
Page 97: Inverter Unit Refrigerant System Check
SiMX042215E Check Inverter Unit Refrigerant System Check Check No.14 Refrigerant system check Is the discharge pipe Reconnect the thermistor. thermistor disconnected from the holder? Check for refrigerant leakage. See the section on refrigerant shortage detection. Replace the refrigerant. (R18870) Inverter Analyzer Check Check No.15 ... - Page 98 Check SiMX042215E terminals), it is possible to connect wires available on site to the outdoor unit from output side of PCB. (Do not connect them to the compressor at the same time, otherwise it may result in incorrect detection.) Step 3 Activate power transistor test operation from the indoor unit.
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Page 99: Outdoor Fan Motor Check
SiMX042215E Check Outdoor Fan Motor Check Check No.16 12/18 class Check if the sinusoidal voltage is generated between pins 1 - 3 and 3 - 5 when the fan motor is manually rotated once. Phase U Phase V Phase W R6000709 ... -
Page 100: Installation Condition Check
Check SiMX042215E 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 101: Outdoor Fan System Check
SiMX042215E Check 5.10 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor Is the lead wire connector Go to Check No. 16. outdoor fan running? disconnected? Outdoor fan system is functioning. Reconnect the connector. (R21195) 5.11 Main Circuit Short Check Check No.20... - Page 102 Check SiMX042215E 18 class Multimeter R6000724 24 class Multimeter (R23458) Part 6 Service Diagnosis...
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Page 103: Power Module Check
SiMX042215E Check 5.12 Power Module Check Check No.22 Check to make sure that the voltage between (+) and (–) of the power module is about 0 V before checking. Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector. - Page 104 Check SiMX042215E 18 class Pin 24: + Pin 23: U Pin 22: V Pin 21: W Pin 20: – R6000725 24 class Pin 24: + Pin 23: U Pin 22: V Pin 21: W Pin 20: – R6000303 Part 6 Service Diagnosis...
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Page 105: Part 7 Trial Operation And Field Settings
SiMX042215E Part 7 Trial Operation and Field Settings 1. Pump Down Operation................102 2. Forced Cooling Operation ..............103 3. Trial Operation ..................104 4. Field Settings ..................105 4.1 When 2 Units are Installed in 1 Room..........105 5. Silicone Grease on Power Transistor/Diode Bridge......106 Part 7 Trial Operation and Field Settings... -
Page 106: Pump Down Operation
Pump Down Operation SiMX042215E 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit. Details 1. Remove the valve caps from the liquid stop valve and the gas stop valve. 2. -
Page 107: Forced Cooling Operation
SiMX042215E Forced Cooling Operation 2. Forced Cooling Operation Outline The forced cooling operation is allowed when both the following conditions are met. 1. The outdoor unit is not abnormal and not in the 3-minute standby mode. 2. The outdoor unit is not operating. Protection functions have priority over all other functions during forced cooling operation. -
Page 108: Trial Operation
Trial Operation SiMX042215E 3. Trial Operation Outline Check that the inter-unit wire is correctly connected. Trial operation should be carried out in COOL operation 1. Measure the supply voltage and make sure that it is within the specified range. 2. -
Page 109: Field Settings
SiMX042215E 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 address. Procedure 1. -
Page 110: Silicone Grease On Power Transistor/Diode Bridge
Silicone Grease on Power Transistor/Diode Bridge SiMX042215E 5. Silicone Grease on Power Transistor/Diode Bridge Outline Apply the specified silicone grease to the heat generation part of a power transistor/diode bridge when you replace an outdoor unit PCB. The silicone grease encourages the heat dissipation of a power transistor/diode bridge. -
Page 111: Part 8 Appendix
SiMX042215E Part 8 Appendix 1. Piping Diagrams..................108 1.1 Indoor Unit....................108 1.2 Outdoor Unit ..................109 2. Wiring Diagrams..................110 2.1 Indoor Unit....................110 2.2 Outdoor Unit ..................111 3. Operation Limit..................114 Part 8 Appendix... -
Page 112: Piping Diagrams
Piping Diagrams SiMX042215E 1. Piping Diagrams Indoor Unit FTKM12UVLWZ FTKM18UVLVZ 4D086364T 4D113909J FTKM24UVLUZ 4D108592N Part 8 Appendix... -
Page 113: Outdoor Unit
SiMX042215E Piping Diagrams Outdoor Unit RKMG12UVLWZ RKMG18UVLVZ 4D137518 4D113913D RKMG24UVLUZ 4D102415F Part 8 Appendix... -
Page 114: Wiring Diagrams
Wiring Diagrams SiMX042215E 2. Wiring Diagrams Indoor Unit FTKM12UVLWZ, FTKM18UVLVZ, FTKM24UVLUZ 3D136888 Note A1P: Control PCB A2P: Display/signal receiver PCB Refer to page 19 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix... -
Page 115: Outdoor Unit
SiMX042215E Wiring Diagrams Outdoor Unit RKMG12UVLWZ 3D141997 Note(s) PCB 1: Main PCB Refer to page 21 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix... - Page 116 Wiring Diagrams SiMX042215E RKMG18UVLVZ 3D128989A Note(s) PCB 1: Main PCB Refer to page 22 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
- Page 117 SiMX042215E Wiring Diagrams RKMG24UVLUZ 3D121872 Note(s) PCB 1: Main PCB PCB 2: Clamp PCB Refer to page 23 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
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Page 118: Operation Limit
Operation Limit SiMX042215E 3. Operation Limit RKMG12UVLWZ, RKMG18UVLVZ, RKMG24UVLUZ 4D142785 Part 8 Appendix... - 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 unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.