said by printscreen:
I don't know how the process of removing the unit was done at the old location but the guy that installed it at my place used a vacuum pump to purge all air from the system before he opened the valves.
That is the proper way of removing all air and more importantly moisture from a system that has been opened.
It is sobering to reflect that one of the best ways to get yourself a reputation as a dangerous citizen these days is to go about repeating the very phrases which our founding fathers used in the struggle for independence. - Charles A. Beard