Parallel Vacuum Pumps - Page 2
Page 2 of 2 FirstFirst 12
Results 14 to 16 of 16
  1. #14
    Join Date
    Apr 2010
    Location
    San Diego, CA
    Posts
    195
    Quote Originally Posted by jpsmith1cm View Post
    In many cases, the larger vacuum pumps are severely limited by the size of the hoses used to evacuate with.

    You aren't going to get a full 10 or 12 CFM flow through a 1/4" set of hoses and a normal service manifold.
    And, as has been said hundreds of times before. If you've got enough moisture in your system that freezing it is an issue, you've got a serious problem.

    The speed of the vacuum in that video is fast enough to freeze moisture, btw, without a 12cfm pump.

    Edit - Forgot the video wasn't in this thread's OP. It's over here: http://hvac-talk.com/vbb/showthread....to-500-Microns

  2. #15
    Join Date
    Jun 2003
    Location
    I'm on the road to Shambala
    Posts
    249
    I use the Yellow Jacket set up with 3/8 hoses and core removers. I do put Teflon tape on the threads. It works just fine. I pulled a 60 ton tandem compressor circuit down to 450 microns in about 6 hours with a less than new JB pump.
    Scooter

    UA Local 630
    West Palm Beach, Florida
    RSES
    FL. Class A License

    www.enterpriseaire.com

  3. #16
    Join Date
    Jul 2011
    Location
    Nanaimo,BC, Canada!
    Posts
    346
    Funny I had this exact discussion with my boss not that long ago.. I've used 3/8 hoses , valve cores removed and a vacuum tree as my evacuation set up for years. He felt it was a waste of time to go through the procedure.. ........ Until I showed him the difference...

    The proof is in the pudding .

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event