Servicing Items to be Confirmed SiUS331604E119 Service Diagnosis1. Servicing Items to be Confirmed1.1 Troubleshooting(1) Initial verification and troubleshooting1. Properly understand the end user's needs and issues.2. Check the cause of errors according to the description provided by the end user.3. Check if the remote controller displays any error codes.(Or use the outdoor unit monitoring mode to check for errors).↓4. If there is no display of error codes, refer to "Troubleshooting Based on Present Conditions" for diagnosis.If an error code is displayed, refer to troubleshooting flow chart for diagnosis.(2) Take appropriate measures.1. Repair the defect or replace the parts according to the troubleshooting results.2. Turn off the power supply for 10 minutes before disassembling.3. The refrigerant has to be collected before refrigerant system components are replaced.(3) Verification after taking appropriate measures1. Run the unit after repairing the defect to confirm normal unit operation.2. Record the check results and inform the client.1.2 Precautions for MaintenancePay attention to the following matters in servicing.(1) Precaution for maintenanceTouch the paint-free metal part of the product (electrical box lid of the standard model; tap bolts of electrical box of anti-corrosion and heavy anti-corrosion models) to release static electricity before starting work.(2) Precautions for maintaining the service coverAfter maintenance, make sure to close the service cover.(Otherwise, leakage of water or contamination by foreign matter may cause defects)(3) Precautions for maintaining the electrical box1. Turn off the power for 10 minutes before opening the cover of the electrical box.2. After opening the cover, use the tester to measure the terminal voltage of the power supply terminal to make sure thatthe power has been cut.Then check if the circuit capacitor voltage is under 50 VDC.3. To avoid PCB defects, touch the earth terminal of the electrical box with your hand when unplugging the connector torelease static electricity.4. Unplug the relay connectors X106A and X107A (RXTQ60TAVJU only) of the outdoor fan motor.When unplugging the relay connectors, do not touch the live parts.(When the outdoor fan is rotating because of strong wind, there is a risk of electric shock due to main circuit boardcapacitor power storage.)5. After maintenance, reconnect the relay connectors of the outdoor fan in their original positions.· Otherwise, the remote controller will display error code E7, preventing normal operation.(4) Precautions for piping work and refrigerant charging:This unit uses R-410A refrigerant. Pay attention to the following conditions.1. The charging pipe and the manifold tube use R-410A products for pressure maintenance and avoiding contaminationby impurities (SUNISO oil, etc.).2. Be sure to purge with nitrogen when brazing.· Properly perform airtightness test and vacuum drying. (Airtight test pressure: 4.0 MPa (580 psi))· Charge refrigerant in liquid state.
