R410a split series room air conditioner (15 pages)
Summary of Contents for Daikin FTX-N Series
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SiUS041638EA Service Manual Inverter Pair Wall Mounted Type FTX-N Series [Applied Models] Inverter Pair : Cooling Only Inverter Pair : Heat Pump...
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SiUS041638EA Inverter Pair Wall Mounted Type FTX-N Series Cooling Only Indoor Unit FTX30NVJU FTX36NVJU Outdoor Unit RK30NMVJU RK30NMVJUA RK36NMVJU RK36NMVJUA Heat Pump Indoor Unit FTX30NVJU FTX36NVJU Outdoor Unit RX30NMVJU RX30NMVJUA RX36NMVJU RX36NMVJUA Table of Contents...
SiUS041638EA 1. Safety Cautions................... v 1.1 Warnings and Cautions Regarding Safety of Workers......... v 1.2 Warnings and Cautions Regarding Safety of Users........vii 2. Icons Used ....................x Part 1 List of Functions ..............1 1. Functions.....................2 Part 2 Specifications ............... 3 1.
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SiUS041638EA 3.9 Liquid Compression Protection Function............ 43 3.10 Defrost Control ................... 44 3.11 Electronic Expansion Valve Control ............45 3.12 Malfunctions ....................48 Part 5 Remote Controller ............... 49 1. Remote Controller ..................50 Part 6 Service Diagnosis..............52 1. General Problem Symptoms and Check Items .........54 2.
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SiUS041638EA 5.5 Four Way Valve Performance Check ............97 5.6 Inverter Unit Refrigerant System Check............. 97 5.7 Inverter Analyzer Check ................98 5.8 Rotation Pulse Check on the Outdoor Unit PCB ........100 5.9 Installation Condition Check..............101 5.10 Discharge Pressure Check............... 101 5.11 Outdoor Fan System Check ..............
Safety Cautions SiUS041638EA 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer. This manual is for the person in charge of maintenance and...
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SiUS041638EA Safety Cautions Warning Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. Do not turn the air conditioner on or off by plugging in or unplugging the power cable.
Safety Cautions SiUS041638EA Caution Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns. Conduct welding work in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency.
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SiUS041638EA Safety Cautions Warning Do not mix air or gas other than the specified refrigerant (R-32 / R- 410A / R-22) in the refrigerant system. If air enters the refrigerant system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.
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Safety Cautions SiUS041638EA Caution Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 M or higher. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause water to enter the room and wet the furniture and floor.
SiUS041638EA Icons Used 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning Warning is used when there is danger of personal injury. Warning Caution Caution is used when there is danger that the reader, Caution through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part...
Indoor Unit SiUS041638EA 1. Indoor Unit FTX30/36NVJU 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 (PCB4) 4) S32 Indoor heat exchanger thermistor 5) S41 Connector for swing motors 6) S46 Connector for display PCB (PCB3)
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SiUS041638EA Indoor Unit Signal Receiver PCB (PCB2) 1) S48 Connector for control PCB (PCB1) 3P224121-1 Display PCB (PCB3) 1) S49 Connector for control PCB (PCB1) Indoor unit ON/OFF button 2) SW1 3) LED1 (H1P) LED for operation (green) 4) LED2 (H2P) LED for timer (yellow) 5) LED3 (H3P) LED for INTELLIGENT EYE (green)
Outdoor Unit SiUS041638EA 2. Outdoor Unit RK(X)30/36NMVJU(A) Main PCB (PCB1) 1) S Connector for terminal block (indoor - outdoor transmission) 2) S20 (white) 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 (heat pump models only) 6) S90...
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SiUS041638EA Outdoor Unit E1, E2 V401 S201 U, V, W S202 2P455785-13 Printed Circuit Board Connector Wiring Diagram...
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Outdoor Unit SiUS041638EA Service Monitor PCB (PCB2) 1) S501, S502 Connector for main PCB (PCB1) 2) LED A LED for service monitor (green) 3) SW5-3 Switch for facility setting Refer to page 111 for details. 4) SW6-2 Switch for facility setting ...
SiUS041638EA Part 4 Functions and Control 1. Main Functions..................15 1.1 Temperature Control .................. 15 1.2 Frequency Principle..................15 1.3 Airflow Direction Control................17 1.4 Fan Speed Control for Indoor Unit ............. 18 1.5 Program Dry Operation ................19 1.6 Automatic Operation................... 20 1.7 Thermostat Control..................
Main Functions SiUS041638EA 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 ...
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SiUS041638EA 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...
Main Functions SiUS041638EA Airflow Direction Control Power-Airflow The large flap sends a large volume of air downward to the floor and provides an optimum control in Dual Flaps cooling, dry, and heating operation. Cooling/Dry During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room.
SiUS041638EA 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.
Main Functions SiUS041638EA 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.
SiUS041638EA 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.
Main Functions SiUS041638EA 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. ...
SiUS041638EA 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. Details NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.
Main Functions SiUS041638EA 1.10 INTELLIGENT EYE Operation Outline This function detects the presence of humans in the room with a motion sensor and reduces the capacity when there is nobody in the room in order to save electricity. Details 1. INTELLIGENT EYE detection method Sampling (20 msec.) 1 sec.
SiUS041638EA Main Functions 1.11 POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, the air conditioner can be operated by increasing the indoor fan rotating speed and the compressor frequency. Details When POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
Main Functions SiUS041638EA 1.12 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press Clock button. is displayed and MON and blink. 2. Press Select or Select button to set the clock to the current day of the week. 3.
SiUS041638EA 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. Details Setting example of the WEEKLY TIMER The same timer settings are used from Monday through Friday, while different timer settings are used for the weekend.
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Main Functions SiUS041638EA To use WEEKLY TIMER operation Setting mode • Make sure the day of the week and time are set. If not, set the day of the week and time. program 1 program 2 program 3 program 4 [Monday] 77˚F (25˚C) 81˚F (27˚C)
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SiUS041638EA 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 •...
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Main Functions SiUS041638EA Copy mode • A reservation made once can be copied to another day of the week. The whole reservation of the selected day of the week will be copied. program 1 program 2 program 3 program 4 [Monday] 77˚F (25˚C) 81˚F (27˚C)
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SiUS041638EA 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.
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Main Functions SiUS041638EA 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 • “ ”...
SiUS041638EA 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.
Thermistor Functions SiUS041638EA 2. Thermistor Functions (3) Outdoor (5) Room Temperature Temperature Expansion valve Thermistor Thermistor (2) Outdoor Heat Exchanger Thermistor Four way valve (4) Indoor Heat Exchanger Thermistor Compressor (1) Discharge Pipe Thermistor (R23851) (1) Discharge The discharge pipe thermistor is used for controlling discharge pipe temperature. If the Pipe Thermistor discharge pipe temperature (used in place of the inner temperature of the compressor) rises abnormally, the operating frequency becomes lower or the operation halts.
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SiUS041638EA Thermistor Functions The conditions are Tc – 1° C Ta – Tc 10° C where Ta is the room temperature and Tc is the indoor heat exchanger temperature. In heating operation, the indoor heat exchanger thermistor is used for heating peak-cut control. If the indoor heat exchanger temperature rises abnormally, the operating frequency becomes lower or the operation halts.
Control Specification SiUS041638EA 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 Cooling Only Model Air conditioner control mode Forced operation mode Forced cooling operation (for pump down operation) Power transistor test mode Normal operation mode...
SiUS041638EA Control Specification Frequency Control Outline The compressor frequency is determined according to the difference between the room thermistor temperature and the target temperature. When the shift of the frequency is less than zero (ΔF<0) by PI control, the target frequency is used as the command frequency. Dropping function Input current control, etc.
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Control Specification SiUS041638EA 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 control. 3.
SiUS041638EA Control Specification Controls at Mode Changing/Start-up 3.3.1 Preheating Operation Outline The inverter operation in open phase starts with the conditions of the outdoor temperature and the preheating command from the indoor unit. Details ON Condition When the outdoor temperature is below 6°C (42.8°F), the inverter operation in open phase starts.
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Control Specification SiUS041638EA 3.3.4 3-Minute Standby Turning on the compressor is prohibited for 3 minutes after turning it off. (The function is not activated when defrosting.) 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...
SiUS041638EA 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.
Control Specification SiUS041638EA 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.
SiUS041638EA 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 temperature (R2T) 13˚C (55.4˚F)
Control Specification SiUS041638EA 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.
SiUS041638EA 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. Details Conditions for Starting Defrost ...
Control Specification SiUS041638EA 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.
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SiUS041638EA Control Specification 3.11.1 Initialization as Power Supply On The electronic expansion valve is initialized (fully closed) when the power is turned on. Then, the valve opening 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.
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Control Specification SiUS041638EA Details Determining thermistor disconnection When the starting control (Cooling: seconds, Heating: seconds) finishes, the detection timer for disconnection of the discharge pipe thermistor ( seconds) starts. When the timer is over, the following adjustment is made. 1. When the operation mode is cooling When the following condition is fulfilled, the discharge pipe thermistor disconnection is ascertained.
SiUS041638EA 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.
1 POWERFUL operation P.24 Note: Refer to the operation manual of applicable model for details. You can download operation manuals from Daikin Business Portal: Daikin Business Portal Document Search Item Category Installation/Operation Manual (URL: https://global1d.daikin.com/business_portal/login/) Remote Controller...
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7 Clock setting P.25 Note: Refer to the operation manual of applicable model for details. You can download operation manuals from Daikin Business Portal: Daikin Business Portal Document Search Item Category Installation/Operation Manual (URL: https://global1d.daikin.com/business_portal/login/) Remote Controller...
SiUS041638EA Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items .........54 2. Troubleshooting with LED .................55 2.1 Indoor Unit....................55 2.2 Outdoor Unit ....................55 3. Service Diagnosis ..................56 4. Troubleshooting ..................59 4.1 Error Codes and Description ..............59 4.2 Indoor Unit PCB Abnormality ..............
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SiUS041638EA 5.9 Installation Condition Check..............101 5.10 Discharge Pressure Check............... 101 5.11 Outdoor Fan System Check ..............102 5.12 Main Circuit Short Check................102 5.13 Capacitor Voltage Check................103 5.14 Power Module Check ................103 Service Diagnosis...
SiUS041638EA 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 the —...
Troubleshooting with LED SiUS041638EA 2. Troubleshooting with LED Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. 1. A protection device of the indoor or outdoor unit is activated, or the thermistor malfunctions. 2.
SiUS041638EA 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. Timer Cancel button < ARC466 Series > (R24532) 2. Press Timer Cancel button repeatedly until a long beep sounds. ...
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Service Diagnosis SiUS041638EA Method 2 1. Press the center of Temp button and Mode button at the same time. (R24533) 5C is displayed on the LCD. (R11821) 2. Select 5C (service check) with Temp or Temp button. 3. Press Mode button to enter the service check mode. (R24534) The left-side number blinks.
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SiUS041638EA 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.
Troubleshooting SiUS041638EA 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) Mismatching of indoor unit and outdoor unit Indoor Indoor unit PCB abnormality Unit Freeze-up protection control/heating peak-cut control Indoor fan motor (DC motor) or related abnormality...
SiUS041638EA 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 ...
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Troubleshooting SiUS041638EA Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the combination of the indoor and outdoor unit. Match the compatible models. ∗ To secure the connection, Check the connection of disconnect the connectors connectors.
SiUS041638EA Troubleshooting Freeze-up Protection Control/Heating Peak-cut Control Error Code Method of Error Freeze-up protection control Detection During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor. Heating peak-cut control During heating operation, the temperature detected by the indoor heat exchanger thermistor is used for the heating peak-cut control (operation halt, outdoor fan stop, etc.) Error Decision...
Troubleshooting SiUS041638EA Indoor 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 Detection abnormal fan motor operation. Error Decision The detected rotation speed does not reach the demanded rotation speed of the target tap, and is Conditions less than 50% of the maximum fan motor rotation speed.
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SiUS041638EA 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 Check No.02 voltage. Refer to P.95 Is the voltage fluctuation Correct the power within ±10% from supply.
Troubleshooting SiUS041638EA 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 during compressor operation.
SiUS041638EA Troubleshooting 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.
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Troubleshooting SiUS041638EA 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.
SiUS041638EA Troubleshooting Signal Transmission Error (between Indoor Unit and Outdoor Unit) Error Code Method of Error The signal transmission data 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.
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Troubleshooting SiUS041638EA 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.95 Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the connection wires...
SiUS041638EA Troubleshooting Signal Transmission Error on Outdoor Unit PCB Error Code Method of Error Communication error between microcomputer mounted on the main microcomputer and PM1. Detection Error Decision The abnormality is determined when the data sent from the PM1 can not be received for 9 Conditions seconds.
Troubleshooting SiUS041638EA Mismatching of Indoor Unit and Outdoor Unit Error Code Method of Error Detection from the signal transmission signal between indoor/outdoor units. Detection Error Decision Improper combination of indoor and outdoor units. Conditions Supposed Wrong models interconnected Causes ...
SiUS041638EA 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. Conditions ...
Troubleshooting SiUS041638EA 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 ...
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SiUS041638EA 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.94 Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No.12 Refer to P.96 Check No.
Troubleshooting SiUS041638EA 4.12 Compressor Lock Error Code Method of Error A compressor lock is detected by the current waveform generated when applying high-frequency Detection voltage to the motor. Error Decision If the error repeats, the system is shut down. Conditions ...
SiUS041638EA Troubleshooting 4.13 DC Fan Lock (Outdoor Fan) Error Code Method of Error An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Detection Error Decision The fan does not start in 15 ~ 30 seconds even when the fan motor is running. Conditions ...
Troubleshooting SiUS041638EA 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 20 A for 2.5 seconds with the compressor running. Conditions (The upper limit of the current decreases when the outdoor temperature exceeds a certain level.) Supposed...
SiUS041638EA Troubleshooting 4.15 Four Way Valve Abnormality Error Code Method of Error The room temperature thermistor and the indoor heat exchanger thermistor are checked if they Detection function within their normal ranges in each operation mode. Error Decision The following condition continues over 10 minutes after operating for 5 minutes. Conditions ...
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Troubleshooting SiUS041638EA 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.94 Correct the four way valve disconnected (loose)? coil. Check No.13 Refer to P.97 Harness disconnected? Reconnect the harness.
SiUS041638EA Troubleshooting 4.16 Discharge Pipe Temperature Control Error Code Method of Error An error is determined with the temperature detected by the discharge pipe thermistor. Detection Error Decision If the temperature detected by the discharge pipe thermistor rises above A, the compressor Conditions stops.
Troubleshooting SiUS041638EA 4.17 High Pressure Control in Cooling Error Code Method of Error High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the Detection temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Error Decision ...
SiUS041638EA Troubleshooting 4.18 System Shutdown due to Compressor Internal Temperature Abnormality Error Code Method of Error Operation is halted when the temperature detected by the discharge pipe thermistor exceeds the Detection determined limit. Error Decision Temperature exceeds the detection threshold of 127.5°C during forced cooling operation. Conditions Supposed ...
Troubleshooting SiUS041638EA 4.19 Compressor System Sensor Abnormality Error Code Method of Error The system checks the DC current before the compressor starts. Detection Error Decision The voltage converted from the DC current before compressor start-up is out of the range 0.5 ~ Conditions 4.5 V.
SiUS041638EA Troubleshooting 4.20 Position Sensor Abnormality Error Code Method of Error A compressor start-up failure is detected by checking the compressor running condition through the Detection position detection circuit. Error Decision If the error repeats, the system is shut down. Conditions ...
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Troubleshooting SiUS041638EA 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.98 Check the power supply voltage. Check No.18 Refer to P.101 Voltage as rated? Correct the power supply.
SiUS041638EA Troubleshooting 4.21 CT or Related Abnormality Remote Controller Display Method of A CT or related error is detected by checking the compressor running frequency and CT-detected Malfunction input current. Detection Malfunction The compressor running frequency is more than A Hz, and the CT input current is less than B Decision Conditions A (Hz)
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Troubleshooting SiUS041638EA 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.98 Turn off the power and turn it on again. Check No.21 Start operation. Refer to P.103 ∗...
SiUS041638EA Troubleshooting 4.22 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, P4 Error Code Method of Error This fault is identified based on the thermistor input voltage to the microcomputer. Detection A thermistor fault is identified based on the temperature sensed by each thermistor. Error Decision ...
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Troubleshooting SiUS041638EA Troubleshooting In case of H9, J3, J6 Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check No.01 Turn on the power again. Refer to P.94 Error displayed Reconnect the connectors again on remote or thermistors.
SiUS041638EA Troubleshooting 4.23 Electrical Box Temperature Rise Error Code Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the Detection compressor off. Error Decision With the compressor off, the radiation fin temperature is above A. Conditions ...
Troubleshooting SiUS041638EA 4.24 Radiation Fin Temperature Rise Error Code Method of Error A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Detection compressor on. Error Decision If the radiation fin temperature with the compressor on is above A. Conditions ...
SiUS041638EA Troubleshooting 4.25 Output Overcurrent Detection Error Code Method of Error An output overcurrent is detected by checking the current that flows in the inverter DC section. Detection Error Decision A position signal error occurs while the compressor is running. Conditions ...
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Troubleshooting SiUS041638EA 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.
SiUS041638EA Check 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. Thermistor temperature Resistance (k) °C °F –20 –4 197.8 –15 148.2 –10 112.1 –5 85.60...
Check SiUS041638EA 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.
SiUS041638EA Check Electronic Expansion Valve Check Check No.12 Conduct the following to check the electronic expansion valve (EV). 1. Check if the EV connector is correctly connected to the PCB. 2. Turn the power off and on again, and check to see if the EV generates a latching sound. 3.
Check SiUS041638EA Four Way Valve Performance Check Check No.13 Turn the power off and then on again. ∗ Four way valve coil Start heating operation. Cooling/Dry/Defrost: Not energized Heating: energized voltage at 208 - 230 Replace the outdoor unit VAC with compressor PCB (main PCB).
SiUS041638EA 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.).
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Check SiUS041638EA Step 3 Activate power transistor test operation from the indoor unit. (1) Turn the power on. (2) Select FAN operation with the Mode button on the remote controller. (3) Press the center of the Temp button and the Mode button at the same time. (4) Select T with the Temp ...
SiUS041638EA Check Rotation Pulse Check on the Outdoor Unit PCB Check No.16 Make sure that the voltage of 320 + 100 V ~ 320 - 50 V is applied. 1. Set operation off and power off. Disconnect the connector S70 or S71. 2.
Check SiUS041638EA 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.
SiUS041638EA Check 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...
Check SiUS041638EA 5.13 Capacitor Voltage Check Check No.21 Before this check, be sure to check the main circuit for short circuit. With the circuit breaker still on, measure the voltage according to the drawing of the model in question. Be careful never to touch any live parts. Multimeter (DC.
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SiUS041638EA Check RK(X)30/36NMVJU(A) DC– (R24539) Service Diagnosis...
SiUS041638EA Part 7 Trial Operation and Field Settings 1. Pump Down Operation................106 2. Forced Cooling Operation ...............107 3. Trial Operation ..................108 4. Field Settings ..................109 4.1 Model Type Setting .................. 109 4.2 Temperature Display Switch ..............109 4.3 When 2 Units are Installed in 1 Room............110 4.4 Facility Setting Switch (cooling at low outdoor temperature)....
SiUS041638EA Pump Down Operation 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit. Details 1. Remove the valve caps from the liquid stop valve and the gas stop valve. 2.
Forced Cooling Operation SiUS041638EA 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.
SiUS041638EA Trial Operation 3. Trial Operation Outline 1. Measure the supply voltage and make sure that it is within the specified range. 2. In cooling operation, select the lowest programmable temperature; in heating operation, select the highest programmable temperature. 3. Carry out the trial operation following the instructions in the operation manual to ensure that all functions and parts, such as the movement of the flaps, are working properly.
Field Settings SiUS041638EA 4. Field Settings Model Type Setting (1) Turn on all the fluorescent lamps in the room, if any, and find a location where the remote controller signals are properly received by the indoor unit (within 23ft (7m)). (2) Configure according to the type of unit (heat pump or cooling only).
SiUS041638EA 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. Indoor Unit PCB ...
Field Settings SiUS041638EA Facility Setting Switch (cooling at low outdoor temperature) Outline This function is designed for facilities such as equipment or computer rooms. It is never to be used in a residence or office where people occupy the space. Details (1) Turning on SW5-3 on the PCB will extend the operation range to –10°C (14°F).
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SiUS041638EA Field Settings Caution If the outdoor unit is installed where the outdoor heat exchanger of the unit is exposed to direct wind, provide a windbreak wall. Intermittent noises may be produced by the indoor unit due to the outdoor fan turning on and off when using facility settings.
Silicone Grease on Power Transistor/Diode Bridge SiUS041638EA 5. Silicone Grease on Power Transistor/Diode Bridge Outline Apply the specified silicone grease to the heat radiation part of a power transistor/diode bridge when you replace an outdoor unit PCB. The silicone grease encourages the heat radiation of a power transistor/diode bridge.
Wiring Diagrams SiUS041638EA 2. Wiring Diagrams Indoor Unit FTX30/36NVJU WIRING DIAGRAM PCB3 PCB1 LED1 OUTDOOR 3.15A C102 LED2 MR10 FIELD WIRING. LED3 C101 GRN/YLW TRANSMISSION CIRCUIT CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN. t°...
SiUS041638EA Wiring Diagrams Outdoor Unit RK(X)30/36NMVJU(A) WIRING DIAGRAM GRN/YLW PCB2 POWER SUPPLY LINE TESTING S501 S502 IN CASE OF HEAT PUMP TYPE X11A PCB1 S201 S202 TO INDOOR UNIT 4 3 2 MRM20 MRM10 3.15A MRM11 V401 3.15A C110 IPM1 ROOM A 1 S20 t˚...
Operation Limit SiUS041638EA 3. Operation Limit RK30/36NMVJU(A) Cooling 114.8 *NOTE 2 57.2 68 73.4 82.4 86 Indoor temp. (˚FWB) Notes: 1. The graphs are based on the following conditions. • Equivalent piping length 25ft • Level difference • Airflow rate High 2.
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Revision History Month / Year Version Revised contents 03 / 2017 SiUS041638E First edition 06 / 2020 SiUS041638EA Model addition: RK30/36NMVJUA, RX30/36NMVJUA...
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Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.
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How to get the room temp reading