Posted 7/1/2009 16:58 (#762660 - in reply to #762638) Subject: RE: How long do you leave the vacuum pump on the a.c. unit?
southeastern ohio
In the HVAC industry, aleast one hour on , then lock down your valves and watch for 10 minutes. A micron gauge in the system is the best setup to check for leaks or moisture.
How long do you leave the vacuum pump on the a.c. unit?
