Servicing Items To Be Confirmed; Troubleshooting; Precautions For Maintenance - Daikin VRV RXYMQ-A Series Service Manual

Servicing Items to be Confirmed

1. Servicing Items to be Confirmed
1.1

Troubleshooting

1. Initial verification and troubleshooting
2. Take appropriate measures.
3. Verification after taking appropriate measures
1.2

Precautions for Maintenance

Pay attention to the following matters in servicing.
1. Precaution for maintenance
2. Precautions for maintaining the service cover
3. Precautions for maintaining the electrical box
4. Precautions for piping work and refrigerant charging:
5. Precautions for operating in servicing mode (field setting):
When a test operation is interrupted or after exiting service mode, please wait for at least one
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(1) 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 monitor mode to check for errors).
If there is no display of error codes, refer to Symptom-Based Troubleshooting on page
144 for diagnosis.
If an error code is displayed, refer to troubleshooting flowchart for diagnosis.
(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.
(1) Run the unit after repairing the defect to confirm normal unit operation.
(2) Record the check results and inform the client.
Touch 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.
After maintenance, make sure to close the service cover.
(Otherwise, leakage of water or contamination by foreign matter may cause defects)
(1) 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 that the 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 to release static electricity.
(4) Unplug the connector X106A (RXYMQ4AVMK) or X1A (RXYMQ4-6AYFK) of the outdoor
fan motor.
When unplugging the 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 board capacitor power storage.)
(5) After maintenance, reconnect the connectors of the outdoor fan in their original positions.
Otherwise, the remote controller will display error code E7, preventing normal operation.
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 contamination by impurities (SUNISO oil, etc.).
(2) Be sure to purge with nitrogen when brazing.
(3) Properly perform airtightness test and vacuum drying. (Airtight test pressure: 4.0 MPa)
(4) Charge refrigerant in liquid state.
SiME332106E
Part 6 Service Diagnosis