Mitsubishi Electric PURY-RP200 Service Handbook page 270

[ IX Troubleshooting ]
3. Leak spot: In the case of extension pipe for indoor unit (Heating season)
(1) Run all the indoor units in heating test run mode.
1) To run the indoor unit in test run mode, turn SW3-2 from ON to OFF when SW3-1 on the outdoor 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 SW3-2 from ON to OFF when SW3-1 on the outdoor control board is ON.
2) Check that all the indoor units are stopped.
(3) Close the service 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 for the indoor unit, and open the service valves
(BV1 and BV2) to adjust refrigerant.
4. Leak spot: In the case of outdoor unit (Heating season)
1) Collect the refrigerant in the entire system (outdoor 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.
(outdoor unit + extension pipe + indoor unit), and charge the system with that amount. Refer to Refer to "VIII [4] 3. " for how
to calculate the amount of refrigerant to be added.
∗1 Refer to Chapter I [7] Vacuum Drying (Evacuation) for detailed procedure.
HWE10140
*1
Then, calculate the proper amount of refrigerant to be added
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