Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 334

[8-12 Measures for Refrigerant Leakage ]
3. Leak spot: In the case of extension pipe and HBC (Heating season)
(1) Run all the indoor units in heating test run mode.
1) To run the indoor unit in test run mode, set SW4 (769) on the outdoor unit control board to 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 (769) on the outdoor control board from ON to OFF.
2) Check that all the indoor units are stopped.
(3) Close the ball valves (BV1 and BV2).
(4) Extract any residual refrigerant in the extension pipes and HBC. Do not discharge refrigerant
into air when it is collected.
(5) Repair the leak.
(6) After repairing the leak, evacuate the air from the extension pipes and HBC
ball valves (BV1 and BV2), and operate the unit in the refrigerant charge adjust mode.
4. Leak spot: In the case of outdoor unit (Heating season)
1) Extract the refrigerant from the entire system (outdoor units, extension pipes, and HBC). 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
(outdoor unit + extension pipe + HBC), and charge the system with that amount. Refer to the following page(s). [6-3-3 Maxi-
mum refrigerant charge]
*1. For details, refer to the following page(s). [1-3-3 Vacuum Drying]
BS_08_L
*1
. Then, calculate the proper amount of refrigerant to be added
*1
. Then, open the
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