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  1. #1
    Join Date
    May 2005
    Location
    Indianapolis, IN
    Posts
    255

    getting the right size vacuum pump

    What would be a good cfm of vacuum pump to have. I do only resi work. What are the best brands and why? Thanks!!

  2. #2
    Join Date
    Jul 2006
    Location
    Southern Ca, Elkton Md
    Posts
    7,572
    I recommend the YJ 1.5, because its the best setup I have ever used.
    "Correct Installation is the Key"

    .1 has killed more HX then Rush Limbaugh

    What is your TESP?

  3. #3
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    we use 5 cfm and 6 cfm pumps
    If Guns Kill People, Do Pencils Misspell Words?

    http://www.youtube.com/watch?v=An2a1...eature=related

    Before we work on artificial intelligence why don't we do something about natural stupidity?

  4. #4
    Join Date
    Jul 2006
    Location
    Southern Ca, Elkton Md
    Posts
    7,572
    Quote Originally Posted by beachtech View Post
    we use 5 cfm and 6 cfm pumps
    Well, that explains alot
    "Correct Installation is the Key"

    .1 has killed more HX then Rush Limbaugh

    What is your TESP?

  5. #5
    Join Date
    Apr 2007
    Posts
    6,285
    I have a 3 cfm dual stage I think it's a bit to big for the systems I have. I would try and get the smallest dual stage possible.

  6. #6
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    Quote Originally Posted by weber View Post
    Well, that explains alot
    i use what they give me

    http://robinair.com/product-new/deta...=1061&catid=11
    If Guns Kill People, Do Pencils Misspell Words?

    http://www.youtube.com/watch?v=An2a1...eature=related

    Before we work on artificial intelligence why don't we do something about natural stupidity?

  7. #7
    Join Date
    Feb 2007
    Location
    Toronto, Ontario
    Posts
    300
    This thread may help you:
    http://www.hvac-talk.com/vbb/showthread.php?t=159232

    Go to the JB website (jbind.com). There is plenty of literature available on selecting a vacuum pump that is right for you. Try to find a distributor of JB, they may let you test out some vacuum pumps. I'm currently testing a 7 cfm and a 3 cfm.

    The most simple way to sum things up is that cfm doesn't mean a whole lot. Once the system reaches a vacuum, which is usually less than a couple minutes on small systems, a 1.5 cfm to a 10 cfm work pretty much the same.

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,603
    They work the same. But the larger one will still be drawing quicker. The primary is still bigger.
    If you draw too quick, you could form ice crystals.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  9. #9
    Join Date
    Mar 2008
    Location
    Kitchener, Ontario
    Posts
    508
    I personally use a 6 cfm Yellow Jacket and have a never had a problem with it very easy to use and quick

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,603
    I use a 6 also.
    Have seen a lot of guys use 7's.

    No need for a large vac, for small resi stuff though.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  11. #11
    Join Date
    Apr 2007
    Posts
    6,285
    All I work pon is small residential sized systems. I have to play with the ballast within a few minutes to keep it around the 3000-5000 microns.....I'd rather it take a little longer to make sure it's not forming crystals instead of boiling off.

  12. #12
    Join Date
    May 2005
    Location
    Indianapolis, IN
    Posts
    255
    So a 5 or 6 cfm YJ, robinair, or JB pump would be the best way to go. And always dual stage...right?

  13. #13
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,603
    If your not going to work on anything bigger the 20 ton, a 3 CFM works good.

    But a 5 or 6 will do also.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

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