“I would have run the 30 inch vacuum over night as well. I hate air and noncondensables. Other than that”
A guy serviced our heat pump several years ago (R22), said there was air in the system and flushed it out by pushing though new freon, letting the old stuff exhaust in the air.
I thought wow, hope the freon police don’t come by. I never worried about freon in the atmosphere other than a tiny concern about R12.
Some trivia: America doesn’t allow flammable refrigerants. Many other countries do. Propane, for instance, can be used as a refrigerant.
—” America doesn’t allow flammable refrigerants.”
R-290 that I added to revive my system tends to be flammable and is used in the USA, but is limited to a given volume.
Ammonia is used in huge systems everywhere.
And can be very reactave.
Were you having a problem with your system before he found air in it?