Mitsubishi Electric PUHY-P200 Service Handbook page 154

3. Leak spot: In the case of extended pipe for indoor unit (Heating season)
1 Conduct a test run for all the indoor units under the heating mode.
(1) To start a test run for all the indoor units, turn on SW3-2 when SW3-1 on the outdoor unit main 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 compressor, turn off SW3-2 when SW3-1 on the outdoor unit main board
is ON.
(2) Check that all the indoor units are being stopped.
3 Close the ball valves (BV1 and BV2).
4 Collect the refrigerant that remains inside the outdoor unit. Do not discharge refrigerant into air into the atmos-
phere when it is collected.
5 Repair the leak.
6 After repairing the leak, perform evacuation of the extended pipe for the indoor unit, and open the ball 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 After repairing the leak, replace the dryer with the new one, and perform evacuation of the entire system, an
calculate the standard amount of refrigerant to be added (for outdoor unit, extended pipe and indoor unit), and
charge the refrigerant. For the amount of refrigerant, refer to 8.[4].3.
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