Page 1 of 2 12 LastLast
Results 1 to 13 of 20
  1. #1
    Join Date
    Sep 2005
    Location
    Fort Myers,FL
    Posts
    11

    Question

    in school the other night my teacher said a good vacuum with a micron gaugeis 800 or below.But everyone else even other teachers has told me 500 or below. So now im a lil confused. anybody have an exact answer.Thanks

  2. #2
    Join Date
    Nov 2004
    Posts
    2,927
    you subtract 500 from 800 and divide 2.=150

    Then add that 150 to 500.=650
    and subtract 150 from 800=650
    then,
    650+650=1300
    then 1300 divided by 2= 650.

    with that equation you can always know the answer.
    Show it to your instructor...

    [Edited by jacob perkins on 09-25-2005 at 07:52 PM]

  3. #3
    Join Date
    Feb 2003
    Location
    S.W. PA
    Posts
    3,298
    800 may be good enough in most cases but be a professional and go to 500
    take some pride in your work and don’t do the minimum and you will go a long way in the field

  4. #4
    Join Date
    Sep 2005
    Location
    Fort Myers,FL
    Posts
    11
    thanks for your reply. where does that equation come from?

  5. #5
    igwt777 is offline Professional Member - T&B bad email address
    Join Date
    Jul 2005
    Posts
    172
    Always pull down to 500 microns and replace filter driers. This will save you lots of time. Do it well the first time... then you don't have to come back and do it again.

  6. #6
    Join Date
    Nov 2004
    Posts
    2,927
    it comes from a slow night on here,


    do you know the micron level at which water boils at room temperture?
    do you know why the instuctory wants to go so much lower?

    well,ask...

  7. #7
    igwt777 is offline Professional Member - T&B bad email address
    Join Date
    Jul 2005
    Posts
    172
    Originally posted by geeray
    thanks for your reply. where does that equation come from?
    Welcome to HVAC-Talk

    You will understand that type of answers on the run!!!

  8. #8
    Join Date
    Sep 2005
    Location
    Fort Myers,FL
    Posts
    11
    the instructor is the one that told me only bring it down to 800 microns but i have always been told to bring it down to 500 or lower by everyone else so thats what i do.

  9. #9
    igwt777 is offline Professional Member - T&B bad email address
    Join Date
    Jul 2005
    Posts
    172
    if you are pulling to 500 you are on the safe side.

  10. #10
    Join Date
    Jul 2002
    Posts
    962
    These micron levels come from the manufactuer. Some say in the install instructions to 800 and other manufactuers say 500. some pump manufactuers say pull down to 500.

  11. #11
    Join Date
    Jul 2001
    Posts
    3,112
    In the field, pull to 500 microns. In your class, if this becomes a test question, your answewr is 800 microns.

  12. #12
    Join Date
    Jan 2005
    Posts
    340
    Originally posted by Chill
    These micron levels come from the manufactuer. Some say in the install instructions to 800 and other manufactuers say 500. some pump manufactuers say pull down to 500.
    Trane says 350 and hold for at least 1 minute.

  13. #13
    igwt777 is offline Professional Member - T&B bad email address
    Join Date
    Jul 2005
    Posts
    172
    Originally posted by travisfl
    Originally posted by Chill
    These micron levels come from the manufactuer. Some say in the install instructions to 800 and other manufactuers say 500. some pump manufactuers say pull down to 500.
    Trane says 350 and hold for at least 1 minute.
    How often do you get to 350 and hold for one minute? What kind of vacuum setup you use?

Page 1 of 2 12 LastLast

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