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Re: How Long To Pull A Vacuume After Opening A/C Lines??
Posted to HVAC Forum on 9/27/2004

Mark Whenever you open a system, you are letting air and moisture into it. Therefore, you have to pull vacuum in order to remove the air and boil off any moisture.

The 20 minutes should be fine. However, the longer (and deeper) you pull a vacuum, the better ... Login to read more.