Mitsubishi Electric PQHY-P200YLM-A Service Handbook page 392

[ IX Troubleshooting ]
7. Leak spot: In the case of extension pipe for indoor unit (Heating season) <PQRY>
(1) Run all the indoor units in heating test run mode.
1) To run the indoor unit in test run mode, turn on SW4 No.769 (SW6-10: ON) on the heat source control board is ON.
2) Change the setting of the remote controller for all the indoor units to the heating mode.
3) Check that all the indoor units are performing a heating operation.
(2) Stop all the indoor units, and stop the compressor.
1) To stop all the indoor units and the compressors, turn SW4 No.769 (SW6-10: ON) from ON to OFF on the heat source control
board.
2) Check that all the indoor units are stopped.
(3) Close the ball valves (BV1 and BV2).
(4) Collect the refrigerant that remains inside the indoor unit. Do not discharge refrigerant into air into the atmosphere
when it is collected.
(5) Repair the leak.
(6) After repairing the leak, perform evacuation of the extension pipe
and BV2) to adjust refrigerant.
8. Leak spot: In the case of heat source unit (Heating season) <PQRY>
1) Collect the refrigerant in the entire system (heat source unit, extended pipe and indoor unit).Do not discharge refrigerant into
the atmosphere when it is collected.
2) Repair the leak.
3) Repair the leak, and evacuate the air from the entire system
(heat source unit + extension pipe + indoor unit), and charge the system with that amount. Refer to Chapter VIII [4] 4. for the
proper amount of refrigerant charge.
*1. Refer to Chapter I [8] Vacuum Drying (Evacuation) for detailed procedure.
HWE15060
*1
for the indoor unit, and open the ball valves (BV1
*1
. Then, calculate the proper amount of refrigerant to be added
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GB