SiBE041010EA Service Manual Inverter Pair Wall Mounted Type J-Series [Applied Models] z Inverter Pair : Heat Pump
SiBE041010EA Inverter Pair Wall Mounted Type J-Series zHeat Pump Indoor Unit FTX20JV1B FTX25JV1B FTX35JV1B ATX20JV1B ATX25JV1B ATX35JV1B FTX20J2V1B FTX25J2V1B FTX35J2V1B ATX20J2V1B ATX25J2V1B ATX35J2V1B Outdoor Unit RX20JV1B RX25JV1B RX35JV1B ARX20JV1B ARX25JV1B ARX35JV1B RX20J3V1B RX25J3V1B RX35J3V1B ARX20J3V1B ARX25J3V1B ARX35J3V1B The removal procedure for each model is separately bound. Refer to page 103 for the booklet number of applicable model.
SiBE041010EA 1. Introduction .............................................................................................v 1.1 Safety Cautions ........................................................................................v 1.2 Used Icons ...............................................................................................x Part 1 List of Functions ................................................................ 1 1. Functions............................................................
SiBE041010EA Part 6 Service Diagnosis............................................................. 45 1. Troubleshooting with LED .....................................................................46 1.1 Indoor Unit..............................................................................................46 1.2 Outdoor Unit ...........................................................................................46 2. Problem Symptoms and Measures ....................................................
SiBE041010EA 2. Trial Operation ......................................................................................96 3. Field Settings ........................................................................................97 3.1 When 2 Units are Installed in 1 Room....................................................97 3.2 Jumper Settings .....................................................................................97 4. Silicon Grease on Power Transistor / Diode Bridge.........................
Introduction SiBE041010EA 1. Introduction 1.1 Safety Cautions Cautions and Warnings Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “ Warning” and “ Caution”. The “ Warning” items are especially important since they can lead to death or serious injury if they are not followed closely. The “ Caution” items can also lead to serious accidents under some conditions if they are not followed.
SiBE041010EA Introduction 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). Insufficient safety measures may cause a fall accident.
Introduction SiBE041010EA Caution Use the welder in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency. 1.1.2 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. Never attempt to modify the equipment.
SiBE041010EA Introduction Warning Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R22) in the refrigerant system. If air enters the refrigerating 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. After charging refrigerant, make sure that there is no refrigerant leak.
Introduction SiBE041010EA Caution Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections may cause excessive heat generation, fire or an electrical shock. If the installation platform or frame has corroded, replace it. Corroded installation platform or frame may cause the unit to fall, resulting in injury.
SiBE041010EA 1.2 Introduction Used Icons Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in the table below: Icon Type of Information Note Description Caution A “caution” is used when there is danger that the reader, through incorrect manipulation, may damage equipment, loose data, get an unexpected result or has to restart (part of) a procedure. Warning A “warning” is used when there is danger of personal injury.
SiBE041010EA Part 1 List of Functions 1. Functions.................................................................................................
SiBE041010EA Functions FTX20/25/35J2V1B RX20/25/35J3V1B FTX20/25/35J2V1B RX20/25/35J3V1B FTX20/25/35JV1B RX20/25/35JV1B FTX20/25/35JV1B RX20/25/35JV1B 1.
ATX20/25/35JV1B ARX20/25/35JV1B ATX20/25/35J2V1B ARX20/25/35J3V1B ATX20/25/35J2V1B ARX20/25/35J3V1B SiBE041010EA ATX20/25/35JV1B ARX20/25/35JV1B Functions z z Air-purifying filter — — Operation limit for cooling (°CDB) 10 ~46 10 ~46 Photocatalytic deodorizing filter — — Operation limit for heating (°CWB) –15 ~18 –15 ~18 Air-purifying filter with photocatalytic deodorizing function — — PAM control z z Standby electricity saving z z Titanium apatite photocatalytic air-purifying fi
SiBE041010EA Part 2 Specifications 1. Specifications ..........................................................................................
Specifications SiBE041010EA 1. Specifications 50 Hz, 230 V Indoor Unit Model FTX20JV1B RX20JV1B Outdoor Unit Capacity Rated (Min. ~ Max.) Running Current (Rated) Power Consumption Rated (Min. ~ Max.) Power Factor (Rated) COP Rated (Min. ~ Max.) Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max. Interunit Height Difference Chargeless Amount of Additional Charge of Refrigerant Indoor Unit Front Panel Color H Airflow Rate Heating 2.5 (1.3 ~ 3.
SiBE041010EA Specifications 50 Hz, 230 V Indoor Unit Model FTX35JV1B RX35JV1B Outdoor Unit Capacity Rated (Min. ~ Max.) Running Current (Rated) Power Consumption Rated (Min. ~ Max.) Power Factor COP Rated (Min. ~ Max.) Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max. Interunit Height Difference Chargeless Amount of Additional Charge of Refrigerant Indoor Unit Front Panel Color H Airflow Rate Heating 3.5 (1.3 ~ 4.8) 11,900 (4,400 ~ 16,400) 3,010 (1,120 ~ 4,130) 4.
Specifications SiBE041010EA 50 Hz, 230 V Indoor Unit Model FTX20J2V1B RX20J3V1B Outdoor Unit Capacity Rated (Min. ~ Max.) Running Current (Rated) Power Consumption Rated (Min. ~ Max.) Power Factor (Rated) COP Rated (Min. ~ Max.) Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max. Interunit Height Difference Chargeless Amount of Additional Charge of Refrigerant Indoor Unit Front Panel Color H Airflow Rate Heating 2.5 (1.3 ~ 3.
SiBE041010EA Specifications 50 Hz, 230 V Indoor Unit Model FTX35J2V1B RX35J3V1B Outdoor Unit Capacity Rated (Min. ~ Max.) Running Current (Rated) Power Consumption Rated (Min. ~ Max.) Power Factor COP Rated (Min. ~ Max.) Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max. Interunit Height Difference Chargeless Amount of Additional Charge of Refrigerant Indoor Unit Front Panel Color H Airflow Rate Heating 3.5 (1.3 ~ 4.8) 11,900 (4,400 ~ 16,400) 3,010 (1,120 ~ 4,130) 4.
Specifications SiBE041010EA 50 Hz, 230 V Indoor Unit Model ATX20JV1B ARX20JV1B Outdoor Unit Capacity Rated (Min. ~ Max.) Running Current (Rated) Power Consumption Rated (Min. ~ Max.) Power Factor (Rated) COP Rated (Min. ~ Max.) Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max. Interunit Height Difference Chargeless Amount of Additional Charge of Refrigerant Indoor Unit Front Panel Color H Airflow Rate Heating 2.5 (1.3 ~ 3.
SiBE041010EA Specifications 50 Hz, 230 V Indoor Unit Model ATX35JV1B ARX35JV1B Outdoor Unit Capacity Rated (Min. ~ Max.) Running Current (Rated) Power Consumption Rated (Min. ~ Max.) Power Factor COP Rated (Min. ~ Max.) Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max. Interunit Height Difference Chargeless Amount of Additional Charge of Refrigerant Indoor Unit Front Panel Color H Airflow Rate Heating 3.5 (1.3 ~ 4.8) 11,900 (4,400 ~ 16,400) 3,010 (1,120 ~ 4,130) 4.
Specifications SiBE041010EA 50 Hz, 230 V Indoor Unit Model ATX20J2V1B ARX20J3V1B Outdoor Unit Capacity Rated (Min. ~ Max.) Running Current (Rated) Power Consumption Rated (Min. ~ Max.) Power Factor (Rated) COP Rated (Min. ~ Max.) Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max. Interunit Height Difference Chargeless Amount of Additional Charge of Refrigerant Indoor Unit Front Panel Color H Airflow Rate Heating 2.5 (1.3 ~ 3.
SiBE041010EA Specifications 50 Hz, 230 V Indoor Unit Model ATX35J2V1B ARX35J3V1B Outdoor Unit Capacity Rated (Min. ~ Max.) Running Current (Rated) Power Consumption Rated (Min. ~ Max.) Power Factor COP Rated (Min. ~ Max.) Liquid Piping Connections Gas Drain Heat Insulation Max. Interunit Piping Length Max. Interunit Height Difference Chargeless Amount of Additional Charge of Refrigerant Indoor Unit Front Panel Color H Airflow Rate Heating 3.5 (1.3 ~ 4.
SiBE041010EA Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit.............................................................................................14 2. Outdoor Unit..........................................................................................
SiBE041010EA Indoor Unit 1. Indoor Unit Control PCB 1) 2) 3) 4) 5) 6) 7) 8) S6 S26 S32 S200 S403 H1, H2, H3, FG V1 JA 9) JB JC 10)LED A 11)FU1 (F1U) Connector for swing motor (horizontal blade) Connector for display PCB Connector for indoor heat exchanger thermistor Connector for fan motor Connector for adaptor PCB (option) Connector for terminal board Varistor Address setting jumper ∗ Refer to page 97 for detail.
Indoor Unit SiBE041010EA Display PCB 1) S27 2) SW1 (S1W) 3) LED1 (H1P) 4) LED2 (H2P) 5) RTH1 (R1T) Connector for control PCB Forced cooling operation [ON/OFF] button ∗ Refer to page 95 for detail.
SiBE041010EA Outdoor Unit 2. Outdoor Unit Main PCB 1) 2) 3) 4) 5) 6) S10 S20 S40 S70 S80 S90 Connector for filter PCB Connector for electronic expansion valve coil Connector for overload protector Connector for fan motor Connector for four way valve coil Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) Connector for filter PCB Connector for reactor Connector for compressor Fuse (3.
Outdoor Unit SiBE041010EA Filter PCB 1) 2) 3) 4) 5) 6) 7) S11 AC1, AC2, S E1, E2 HL2, HN2 HR1 FU3 V2, V3 Connector for main PCB Connector for terminal board Terminal for earth wire Connector for main PCB Connector for reactor Fuse (20 A, 250 V) Varistor E1, E2 HR1 HN2 HL2 V2 AC2 V3 AC1 S11 S FU3 3P206706-1 17 Printed Circuit Board Connector Wiring Diagram
SiBE041010EA Part 4 Function and Control 1. Main Functions......................................................................................19 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 Temperature Control ..............................................................................19 Frequency Principle................................................................................19 Airflow Direction Control.........................................................................
Main Functions SiBE041010EA 1. Main Functions 1.1 Temperature Control Definitions of Temperatures The definitions of temperatures are classified as following.
SiBE041010EA Drawing of Inverter Main Functions The following drawing shows a schematic view of the inverter principle: Refrigerant circulation rate (high) AC power Amount of heat exchanged air (small) DC power high speed Amount of heat exchanged air (large) high f low f low speed 50 Hz freq= constant 60 Hz freq=variable Amount of heat exchanged air (large) Amount of heat exchanged air (small) capacity= variable Refrigerant circulation rate (low) Inverter Features (R2812) The inverter provid
Main Functions 1.3 SiBE041010EA Airflow Direction Control Power-Airflow Flap The large flap sends a large volume of air downward to the floor and provides an optimum control in cooling, dry, and heating operation. 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. During heating operation, the large flap directs airflow downward to spread the warm air to the entire room.
SiBE041010EA 1.4 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. This is done through phase control and Hall IC control. For more information about Hall IC, refer to the troubleshooting for fan motor on page 54.
Main Functions 1.5 SiBE041010EA 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.
SiBE041010EA 1.6 Main Functions Automatic Operation Outline Detail 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 1.7 SiBE041010EA 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 Condition 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. The operation turns on in any zones except A.
SiBE041010EA 1.8 Main Functions NIGHT SET Mode Outline When the OFF TIMER is set, the NIGHT SET Mode is automatically activated. The NIGHT SET Mode keeps the airflow rate setting. Detail The 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 SiBE041010EA 1.10 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, operate the air conditioner 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. Operation mode Fan speed Target temperature COOL DRY H tap + A rpm Dry rotating speed + A rpm 18°C Lowered by 2.
SiBE041010EA Main Functions 1.12 Other Functions 1.12.1 Hot-Start Function In order to prevent the cold air blast that normally comes when heating operation is started, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or made very weak thereby carrying out comfortable heating of the room. *The cold air blast is also prevented using similar control when the defrost control starts or when the thermostat is turned ON. 1.12.
Function of Thermistor SiBE041010EA 2. Function of Thermistor Electronic expansion valve (1) (3) Four way valve (2) Compressor (R14247) (1) Outdoor Heat Exchanger Thermistor 1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe temperature.
SiBE041010EA Control Specification 3. Control Specification 3.1 Mode Hierarchy Outline The air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing.
Control Specification SiBE041010EA 1. Determine command frequency Command frequency is determined in the following order of priority. 1. Limiting defrost control time 2. Forced cooling 3. Indoor frequency command 2. Determine upper limit frequency The minimum value is set as an upper limit frequency among the frequency upper limits of the following functions: Compressor protection, input current, discharge pipe temperature, heating peak-cut, freezeup protection, defrost. 3.
SiBE041010EA 3.3 Control Specification Controls at Mode Changing / Start-up 3.3.1 Preheating Control Outline The inverter operation in open phase starts with the conditions of the preheating command from the indoor unit, the outdoor temperature, and the discharge pipe temperature.
Control Specification SiBE041010EA 3.3.4 3-minute Standby Turning on the compressor is prohibited for 3 minutes after turning it off. (Except 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 C B A D E (sec.) Time F (R13528) 3.
SiBE041010EA 3.5 Control Specification Input Current Control Outline The microcomputer calculates the input current while the compressor is running, and sets the frequency upper limit from the input current. In case of heat pump models, this control which is the upper limit control of the frequency takes priority over the lower limit of control of four way valve operation compensation.
Control Specification 3.6 SiBE041010EA Freeze-up Protection Control Outline During cooling operation, the signal sent from the indoor unit controls the operating frequency limitation and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into zones.) Detail The operating frequency limitation is judged with the indoor heat exchanger temperature.
SiBE041010EA 3.8 Control Specification Outdoor Fan Control 1. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF. 2. Fan OFF control during defrosting The outdoor fan is turned OFF during defrosting. 3. Fan OFF delay when stopped The outdoor fan is turned OFF 70 seconds after the compressor stops. 4.
Control Specification SiBE041010EA 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. The system is in heating operation. The compressor operates for 6 minutes.
SiBE041010EA Control Specification 3.11 Electronic Expansion Valve Control During target discharge pipe temperature control When the frequency changes under target discharge pipe temperature control When the disconnection of the discharge pipe thermistor is ascertained When the frequency changes under the control for disconnection of the discharge pipe thermistor Under defrost control The followings are the examples of electronic expansion valve control which function in each operation mode.
Control Specification SiBE041010EA 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 equalization is developed. 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. 3.11.
SiBE041010EA Control Specification 3.11.7 Control for Disconnection of the Discharge Pipe Thermistor 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.
Control Specification SiBE041010EA 3.12 Malfunctions 3.12.1 Sensor Malfunction Detection Sensor malfunction may occur in the thermistor. Relating to Thermistor Malfunction 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.
SiBE041010EA Part 5 Remote Controller 1. Remote Controller .................................................................................
Remote Controller SiBE041010EA 1. Remote Controller Display (LCD) Signal transmitter • Displays the current settings. (In this illustration, each section is shown with all its displays on for the purpose of explanation.) Receiver TEMPERATURE adjustment buttons • To use the remote controller, aim the transmitter at the indoor unit. If there is anything to block signals between the unit and the remote controller, such as a curtain, the unit will not operate.
SiBE041010EA Remote Controller Open the Front Cover R MODE button • Selects the operation mode. AUTO DRY COOL HEAT FAN FAN setting button • Selects the airflow rate setting every time you press this button. ON TIMER button • Press this button and adjust the day and time with TIMER setting button. Press this button again to complete TIMER setting. Auto Indoor unit quiet Low Middle low OFF TIMER button • Press this button and adjust the day and time with TIMER setting button.
SiBE041010EA Part 6 Service Diagnosis 1. Troubleshooting with LED .....................................................................46 1.1 Indoor Unit..............................................................................................46 1.2 Outdoor Unit ...........................................................................................46 2. Problem Symptoms and Measures .......................................................47 3. Service Check Function ................................
SiBE041010EA Troubleshooting with LED 1. Troubleshooting with LED 1.1 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. 2. When a signal transmission error occurs between the indoor and outdoor units. In either case, conduct the diagnostic procedure described in the following pages. Operation lamp (green) (R11948) Service Monitor 1.
Problem Symptoms and Measures SiBE041010EA 2. Problem Symptoms and Measures Symptom Check Item The unit does not operate. Check the power supply. Check the type of the indoor unit. Check the outdoor temperature. Diagnose with remote controller indication. Operation sometimes stops. Details of Measure Reference Page Check if the rated voltage is supplied. Check if the indoor unit type is compatible with the outdoor unit.
SiBE041010EA Service Check Function 3. Service Check Function Check Method 1 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen. Timer cancel button (R18206) 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below. No. Code No. Code No.
Service Check Function SiBE041010EA Check Method 2 1. Press the center of the [TEMP] button and the [MODE] button at the same time to enter the diagnosis mode. (R19114) The left-side number blinks. (R14967) 2. Press the [TEMP] or beeps or the long beep. button and change the number until you hear the two consecutive (R19115) 3. Diagnose by the sound. beep : The left-side number does not correspond with the error code.
SiBE041010EA Service Check Function 5. Press the [TEMP] or button and change the number until you hear the long beep. (R19115) 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. long beep : Both the left-side and right-side numbers correspond with the error code. 7. Determine the error code.
Troubleshooting SiBE041010EA 4. Troubleshooting 4.
SiBE041010EA 4.2 Troubleshooting Indoor Unit PCB Abnormality A1 Error Code Method of Error Detection The system checks if the circuit works properly within the microcomputer of the indoor unit. Error Decision Conditions The system cannot set the internal settings.
Troubleshooting 4.3 SiBE041010EA Freeze-up Protection Control or Heating Peak-cut Control Error Code A5 Method of Error Detection Freeze-up protection control Error Decision Conditions Freeze-up protection control During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor.
SiBE041010EA 4.4 Troubleshooting Fan Motor (DC Motor) or Related Abnormality Error Code A6 Method of Error Detection The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Error Decision Conditions 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.
Troubleshooting SiBE041010EA Troubleshooting Caution Check No.03 Refer to P.86 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power supply. (Unplug the power cable or turn the breaker off.) Note: The motor may break when the motor connector is disconnected with the power supply on. (Turn off the power supply before connecting the connector also.) Check the connector for connection.
SiBE041010EA 4.5 Troubleshooting Thermistor or Related Abnormality (Indoor Unit) Error Code C4, C9 Method of Error Detection The temperatures detected by the thermistors determine thermistor errors. Error Decision Conditions The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Supposed Causes Disconnection of connector Thermistor corresponding to the error code is defective Defective indoor unit PCB Troubleshooting Caution Check No.01 Refer to P.
Troubleshooting 4.6 SiBE041010EA Refrigerant Shortage Error Code Method of Error Detection U0 Refrigerant shortage detection I: Refrigerant shortage is detected by checking the input current value and the compressor running frequency. If the refrigerant is short, the input current is lower than the normal value. Refrigerant shortage detection II: Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of the electronic expansion valve.
SiBE041010EA Troubleshooting Troubleshooting Caution Check No.01 Refer to P.85 Check No.12 Refer to P.87 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Any thermistor disconnected? NO Stop valve closed? YES ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗ Room temperature thermistor ∗ Outdoor temperature thermistor YES Replace the thermistor(s) in position. Open the stop valve.
Troubleshooting 4.7 SiBE041010EA Low-voltage Detection or Over-voltage Detection Error Code U2 Method of Error Detection 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. Error Decision Conditions Low-voltage detection: The voltage detected by the DC voltage detection circuit is below 180 V.
SiBE041010EA Troubleshooting Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation within ±10% from the rated value? NO Correct the power supply. YES Check the connection of the compressor harness. Loose or disconnected? YES Reconnect the harness. NO Rotate the outdoor fan by hand.
Troubleshooting 4.8 SiBE041010EA Signal Transmission Error (between Indoor Unit and Outdoor Unit) Error Code U4 Method of Error Detection The data received from the outdoor unit in signal transmission is checked whether it is normal. Error Decision Conditions The data sent from the outdoor unit cannot be received normally, or the content of the data is abnormal.
SiBE041010EA Troubleshooting Troubleshooting Caution Check No.11 Refer to P.87 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation within ±10% from the rated value? NO Correct the power supply. YES Check the indoor unit - outdoor unit connection wires. Is there any wiring error? YES Correct the indoor unit outdoor unit connection wires.
Troubleshooting 4.9 SiBE041010EA Unspecified Voltage (between Indoor Unit and Outdoor Unit) Error Code UA Method of Error Detection The supply power is detected for its requirements (different from pair type and multi type) by the indoor / outdoor transmission signal. Error Decision Conditions The pair type and multi type are interconnected.
SiBE041010EA Troubleshooting 4.10 Outdoor Unit PCB Abnormality Error Code E1 Method of Error Detection The system checks if the microprocessor is working in order. The system checks if the zero-cross signal comes in properly. Error Decision Conditions The microprocessor program runs out of control. The zero-cross signal is not detected.
Troubleshooting SiBE041010EA 4.11 OL Activation (Compressor Overload) Error Code E5 Method of Error Detection A compressor overload is detected through overload protector (OL). Error Decision Conditions If the error repeats, the system is shut down.
SiBE041010EA Troubleshooting Troubleshooting Caution Check No.01 Refer to P.85 Check No.12 Refer to P.87 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Discharge pipe thermistor disconnected? NG ∗ Discharge pipe thermistor Replace the discharge pipe thermistor. OK Connectors are properly connected? Check No.14 Refer to P.88 Insert the thermistor in position. NO Check No. 01 Check the thermistors. Check No.13 Refer to P.
Troubleshooting SiBE041010EA 4.12 Compressor Lock Error Code E6 Method of Error Detection A compressor lock is detected by checking the compressor running condition through the position detection circuit. Error Decision Conditions Operation stops due to overcurrent. If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes without any other error Supposed Causes Compressor locked Compressor harness disconnected Troubleshooting Caution Check No.
SiBE041010EA Troubleshooting 4.13 DC Fan Lock Error Code E7 Method of Error Detection An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Error Decision Conditions The fan does not start in about 15 ~ 60 seconds even when the fan motor is running. If the error repeats, the system is shut down.
Troubleshooting SiBE041010EA 4.14 Input Overcurrent Detection Error Code E8 Method of Error Detection An input overcurrent is detected by checking the input current value with the compressor running. Error Decision Conditions The current exceeds about 14 A for 2.5 seconds with the compressor running. (The upper limit of the current decreases when the outdoor temperature exceeds a certain level.) Supposed Causes Power supply voltage is not as specified.
SiBE041010EA Troubleshooting 4.15 Four Way Valve Abnormality Error Code EA Method of Error Detection The room temperature thermistor and the indoor heat exchanger thermistor are checked if they function within their normal ranges in each operation mode. Error Decision Conditions Cooling / Dry A following condition continues over 10 minutes after operating for 5 minutes.
Troubleshooting SiBE041010EA Troubleshooting Caution Check No.01 Refer to P.85 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Four way valve coil disconnected (loose)? YES Correct the four way valve coil. NO Check No.13 Refer to P.88 Harness out of connector? YES Reconnect the harness. NO Check No.14 Refer to P.88 Check the continuity of the four way valve coil and harness. Disconnect the harness from the connector.
SiBE041010EA Troubleshooting 4.16 Discharge Pipe Temperature Control Error Code F3 Method of Error Detection An error is determined with the temperature detected by the discharge pipe thermistor. Error Decision Conditions If the temperature detected by the discharge pipe thermistor rises above A°C, the compressor stops. The error is cleared when the discharge pipe temperature has dropped below B°C.
Troubleshooting SiBE041010EA 4.17 High Pressure Control in Cooling Error Code F6 Method of Error Detection High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Error Decision Conditions The temperature sensed by the outdoor heat exchanger thermistor rises above about 60°C. The error is cleared when the temperature drops below about 50°C.
SiBE041010EA Troubleshooting 4.18 Compressor System Sensor Abnormality Error Code H0 Method of Error Detection The system checks the DC current before the compressor starts. Error Decision Conditions The DC current before compressor start-up is out of the range 0.5 ~ 4.5 V (sensor output converted to voltage value) The DC voltage before compressor start-up is below 50 V.
Troubleshooting SiBE041010EA 4.19 Position Sensor Abnormality Error Code H6 Method of Error Detection A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit. Error Decision Conditions If the error repeats, the system is shut down. Reset condition: Continuous run for about 11 minutes without any other error Supposed Causes 75 Power supply voltage is not as specified.
SiBE041010EA Troubleshooting Troubleshooting Check No.15 Refer to P.89 Check No.18 Refer to P.91 Check No.20 Refer to P.92 Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Voltage as rated? NO Correct the power supply. YES Check No. 18 Check the discharge pressure. OK? NO Replace the stop valve. YES Check No. 20 Check the short circuit of the diode bridge.
Troubleshooting SiBE041010EA 4.20 DC Voltage / Current Sensor Abnormality Error Code H8 Method of Error Detection DC voltage or DC current sensor abnormality is identified based on the compressor running frequency and the input current. Error Decision Conditions The compressor running frequency is above 52 Hz. (The input current is also below 0.1 A.) If the error repeats, the system is shut down.
SiBE041010EA Troubleshooting 4.21 Thermistor or Related Abnormality (Outdoor Unit) Error Code H9, J3, J6, P4 Method of Error Detection 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. Error Decision Conditions The thermistor input voltage is above 4.96 V or below 0.04 V with the power on.
Troubleshooting Troubleshooting SiBE041010EA In case of “H9” “J3” “J6” Caution Check No.01 Refer to P.85 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn on the power again. Error displayed again on remote controller? NO Reconnect the connectors or thermistors. YES Check No. 01 Check the thermistor resistance value. Normal? J3 error: the discharge pipe temperature is lower than the heat exchanger temperature.
SiBE041010EA Troubleshooting 4.22 Electrical Box Temperature Rise Error Code L3 Method of Error Detection An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Error Decision Conditions 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.
Troubleshooting SiBE041010EA 4.23 Radiation Fin Temperature Rise Error Code L4 Method of Error Detection A radiation fin temperature rise is detected by checking the radiation fin thermistor with the compressor on. Error Decision Conditions Supposed Causes 81 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. If the error repeats, the system is shut down.
SiBE041010EA Troubleshooting Troubleshooting Caution Check No.17 Refer to P.91 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power and turn it on again to start the system. Check No.19 Refer to P.92 Error displayed again? YES Has the PCB been replaced? NO YES NO Check if silicon grease is applied properly on the radiation fin. If not, apply the silicon grease. Check the radiation fin temperature.
Troubleshooting SiBE041010EA 4.24 Output Overcurrent Detection Error Code L5 Method of Error Detection An output overcurrent is detected by checking the current that flows in the inverter DC section. Error Decision Conditions A position signal error occurs while the compressor is running. A rotation speed error occurs while the compressor is running. An output overcurrent signal is fed from the output overcurrent detection circuit to the microcomputer.
SiBE041010EA Troubleshooting Troubleshooting Caution Check No.15 Refer to P.89 Check No.17 Refer to P.91 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again. Check No. 17 Check the installation condition.
Check SiBE041010EA 5. Check 5.1 Thermistor Resistance Check Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using tester. The data is for reference purpose only. Thermistor temperature (°C) Resistance (kΩ) Room temperature thermistor Other thermistors –20 –15 73.4 57.0 197.8 148.2 –10 –5 44.7 35.3 112.1 85.60 0 5 28.2 22.6 65.93 51.14 10 15 18.3 14.8 39.99 31.52 20 25 12.1 10.0 25.02 20.00 30 35 8.2 6.9 16.10 13.
SiBE041010EA 5.2 Check Fan Motor Connector Output Check Check No.03 1. 2. 3. Fan motor wire breakdown / short circuit check Check the connector for connection. Turn the power off. Check if each resistance at the phases U - V and V - W is 90 Ω ~ 100 Ω (between the pins 12 - 9, and between 9 - 6). Motor control voltage check 1. Check the connector for connection. 2. Check the motor control voltage is generated (between the pins 2 - 3). 1. 2. 3.
Check 5.3 SiBE041010EA Power Supply Waveforms Check Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check the waveform disturbance. Check if the power supply waveform is a sine wave. (Fig.1) Check if there is waveform disturbance near the zero cross. (sections circled in Fig.2) Fig.1 Fig.2 (R1444) (R1736) 5.4 Electronic Expansion Valve Check Check No.12 Conduct the followings to check the electronic expansion valve (EV). 1.
SiBE041010EA 5.5 Check Four Way Valve Performance Check Check No.13 Turn off the power and turn it on again. ∗ Four way valve coil Cooling / Dry : No continuity Heating : Continuity Start heating operation. S80 voltage at 120 - 220 VDC with compressor on? (Fig. 1) NO Replace the outdoor unit PCB. YES Disconnect the four way valve coil from the connector and check the continuity. Four way valve coil resistance at 1000 ~ 2000 Ω? NO Replace the four way valve coil. YES Replace the four way valve.
Check 5.7 SiBE041010EA 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.). The inverter analyzer makes it possible to judge the cause of trouble easily and securely.
SiBE041010EA Check Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) If all the LEDs are lit uniformly, the compressor is defective. → Replace the compressor. (2) If the LEDs are not lit uniformly, check the power module. → Refer to Check No.22. (3) If NG in Check No.22, replace the power module. (Replace the main PCB. The power module is united with the main PCB.) If OK in Check No.22, check if there is any solder cracking on the PCB.
Check 5.9 SiBE041010EA Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air suction and discharge area. NG Change the installation location or direction. OK Is the discharged air short-circuited? YES Change the installation location or direction. NO Is the outdoor heat exchanger very dirty? YES Clean the outdoor heat exchanger.
SiBE041010EA Check 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor lead wire connector disconnected? NO Outdoor fan running? YES YES Reconnect the connector. NO Go to Check No. 16. Outdoor fan system is functioning. (R15001) 5.12 Main Circuit Short Check Check No.20 Note: Make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approximately 0 V before checking.
Check SiBE041010EA 5.13 Power Module Check Check No.22 Note: 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. Follow the procedure below to measure resistance between the terminals of the power module and the terminals of the compressor with a multi-tester.
SiBE041010EA Part 7 Tips for Servicing 1. Tips for Servicing ..................................................................................95 1.1 Pump Down Operation ...........................................................................95 1.2 Forced Cooling Operation ......................................................................95 2. Trial Operation ......................................................................................96 3. Field Settings ..................................
Tips for Servicing SiBE041010EA 1. Tips for Servicing 1.1 Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing the unit. Detail 1) Remove the valve caps from the liquid stop valve and the gas stop valve. 2) Carry out forced cooling operation. 3) After 5 to 10 minutes, close the liquid stop valve with a hexagonal wrench. 4) After 2 to 3 minutes, close the gas stop valve and stop the forced cooling operation.
SiBE041010EA Trial Operation 2. Trial Operation Outline 1. Measure the power supply voltage and make sure that it falls within the specified range. 2. Trial operation should be carried out in either cooling or heating operation. In cooling operation, select the lowest programmable temperature (18°C); in heating operation, select the highest programmable temperature (30°C). Trial operation may be disabled in either operation mode depending on the room temperature.
Field Settings SiBE041010EA 3. Field Settings 3.1 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 Cut the address setting jumper JA on the control PCB.
SiBE041010EA Silicon Grease on Power Transistor / Diode Bridge 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. Detail 1. 2. 3. 4. Wipe off the old silicon grease completely. Apply the silicon grease evenly. See the illustrations below for examples of application.
SiBE041010EA Part 8 Appendix 1. Piping Diagrams..................................................................................100 1.1 Indoor Unit............................................................................................100 1.2 Outdoor Unit .........................................................................................101 2. Wiring Diagrams..................................................................................102 2.1 Indoor Unit.....................................
SiBE041010EA Piping Diagrams 1. Piping Diagrams 1.1 Indoor Unit FTX20/25/35JV1B, FTX20/25/35J2V1B, ATX20/25/35JV1B, ATX20/25/35J2V1B INDOOR UNIT HEAT EXCHANGER 7.0CuT 7.0CuT 4.8CuT THERMISTOR ON HEAT EXCH. 7.0CuT 7.0CuT FIELD PIPING (6.4CuT) CROSS FLOW FAN M FAN MOTOR FIELD PIPING (9.5CuT) 9.
Piping Diagrams 1.2 SiBE041010EA Outdoor Unit RX20/25JV1B, RX20/25J3V1B, ARX20/25JV1B, ARX20/25J3V1B OUTDOOR UNIT 9.5CuT 7.0CuT OUTDOOR TEMPERATURE THERMISTOR HEAT EXCHANGER 7.0CuT HEAT EXCHANGER THERMISTOR 6.4CuT 6.4CuT MOTOR OPERATED VALVE 6.4CuT 7.0CuT MUFFLER WITH FILTER MUFFLER WITH FILTER M 9.5CuT PROPELLER FAN FOUR WAY VALVE ON: HEATING LIQUID STOP VALVE FIELD PIPING (6.4CuT) 6.4CuT DISCHARGE PIPE THERMISTOR 9.5CuT 4.8CuT 9.5CuT 9.5CuT 9.
SiBE041010EA Wiring Diagrams 2. Wiring Diagrams 2.1 Indoor Unit FTX20/25/35JV1B, FTX20/25/35J2V1B, ATX20/25/35JV1B, ATX20/25/35J2V1B PCB 2 S27 1 BLK LED1 H1P BLK LED2 H2P BLK BLK BLK 9 BLK PCB 1 S26 9 FIELD WIRING.
Removal Procedure (Booklet No.) SiBE041010EA 3. Removal Procedure (Booklet No.) Refer to the following booklets for removal procedure. 103 ∗FTX20/25/35JV1B, ATX20/25/35JV1B Refer to Si041051. ∗FTX20/25/35J2V1B, ATX20/25/35J2V1B Refer to Si041264. ∗RX20/25/35JV1B, ARX20/25/35JV1B Refer to Si001073. ∗RX20/25/35J3V1B, ARX20/25/35J3V1B Refer to Si001276.
Revision History Month / Year Version 03 / 2010 SiBE041010 06 / 2013 SiBE041010EA Revised contents First edition Model addition: FTX20/25/35J2V1B, ATX20/25/35J2V1B, RX20/25/35J3V1B, ARX20/25/35J3V1B
Warning z Daikin products are manufactured for export to numerous countries throughout the world. Prior to purchase, please confirm with your local authorised importer, distributor and/or retailer whether this product conforms to the applicable standards, and is suitable for use, in the region where the product will be used. This statement does not purport to exclude, restrict or modify the application of any local legislation. z Ask a qualified installer or contractor to install this product.
