Posted 7/1/2009 19:55 (#762777 - in reply to #762638) Subject: RE: How long do you leave the vacuum pump on the a.c. unit?
Boone, Iowa
I pull the system down into a vacuum, shut off the valves on the gauges and shut the vacuum pump off. Check to see if you have less than 1" of vacuum in 10 minutes. If you do, you have not wasted 1/2 hour vacuuming down the system, just to tear apart to fix a leak. If it passes the leak test, then vacuum down the system for 20-30 minutes and charge the system.
How long do you leave the vacuum pump on the a.c. unit?
