Not a big issue to do. The competent installer will bring a vacuum pump and use that to evacuate all the air in the system, exactly as the installation document you linked to above. Standing water is removed also, as when the pressure drops, the water changes to water vapour ("boils") and is extracted along with the remaining air.

Conversely, an installer will purge the air in the tubes just by letting a little of the refrigerant gas out, and letting it flow out, supposedly displacing all the air in the pipes. This does not remove any standing water in the pipes though.

It is not for the water discharge pipes, only the refrigerant pipes. Purging has never been a valid way to evacuate the refrigerant lines, because 1. refrigerant is released into the atmosphere 2. it's not a great method and 3. vacuuming serves to check for leaks too.

This post has been edited by stormer.lyn: Jun 2 2024, 08:35 AM