When replacing a compressor on a heat recovery Daikin VRV 3 condensing unit (REYQ120PATJ) is it considered acceptable procedure to isolate the condensing unit, recover refrigerant and carry out the repair? I'm thinking if I place it in Recovery Mode, front seat the 3 service valves and pull from the charging port (I would have to add an additional pressure tap to permit nitrogen purging) I should be fine instead of pulling the entire charge and p-test/evacuating the entire system.

Also, I have a Daikin technical bulletin that seems to state that burnouts require refrigerant replacement and the addition of a suction drier. What about a non-acidic compressor short to ground? Technically the windings failed so some level of contamination could exist, but if an oil test confirms insignificant acid levels I would suspect these measures would be unnecessary.