Hearing more and more of engineers using a recovering method by using the system compressors to pump directly into the recovery bottle.
VRV system which has two or more compressors and one requires changing or requires pressure/leak testing and using the running compressor to pump into the recovery bottle.

Iv some safety concerns that by boing so there's no Head pressure control for the bottle if theres a possibility of over changing.
plus what's the potential for oil loss with the working compressor moving oil straight into the bottle,with no oil sight glass on most VRV compressors.
Is this good practice?

plus how many of you would close the service ports/ pipe lines on a VRV and just recovery what's in the condensor to fit a new compressor. My thoughts are the compressor has failed for a reason and it's a good time to confirm the gas charge.