Posted 9/4/2017 10:10 (#6227973 - in reply to #6227937) Subject: RE: Water Freezes at 32F
And that is the reason that picky HVAC guys will pull a vacuum on the system, then charge with nitrogen, the pull a vacuum again, and possibly do that 3 times in an attempt to increase the odds that they have removed any water that may have turned to ice.