Any feedback would be great… finishing up a heat pump mini split install. We’ve doing all the normal test procedures, pressure test and held . However with the evacuation, we can get it down to 250 microns but for the decay test it goes up to 2500-4500 microns. Triple evacuation then again. Pressure tested again and went around with ultra sonic leak detector and bubbles . Nothing. I’m thinking moisture ?

Posted by Ginger_hvac at 2025-06-04 18:08:12 UTC