Location Of Leaks: Extension Piping Or Indoor Units (Heating Mode); Location Of Leaks: Heat Source Unit (When Heating) - Mitsubishi Electric CITY MULTI PQRY-P200YMF-C Service Handbook

[3] Location of Leaks: Extension Piping or Indoor Units (Heating mode)

1 Test run all indoor units in heating mode.
1. With SW3-1 on the MAIN board of the heat source unit set to ON and SW3-2 OFF → ON to test run all
indoor units.
2. Change the remote controller settings so that all indoor units run in heating mode.
3. Check that all indoor units are running in heating mode.
2 Stop all indoor units and the compressor.
1. With SW3-1 on the MAIN board of the heat source unit set to ON and SW3-2 ON → OFF to stop all indoor
units and the compressor.
2. Check that all indoor units have been stopped.
3 Close both ball valves (BV1 and BV2).
4 Remove any refrigerant remaining in the extension piping or the indoor units.
Reclaim the refrigerant; do not discharge it into the air.
5 Repair the leaks.
6 After the leaks are repaired, extract all air from the extension piping and the indoor units to create a vacuum.
Then, open both ball valves (BV1 and BV2), then adjust the refrigerant amount and verify that the refrigerant is
circulating properly.

[4] Location of Leaks: Heat Source Unit (when Heating)

1 Remove any refrigerant from the entire system (heat source unit, extension piping and indoor units).
Reclaim the refrigerant; do not discharge it into the air.
2 Repair the leaks.
3 After the leaks are repaired, replace the dryer with a new one and extract all of the air from the entire system to
create a vacuum. Then, refill with refrigerant until it reaches the calculated specification (heat source unit +
extension piping + indoor units). Refer to "Chapter 6" for more details.
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