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  1. #1
    Join Date
    Dec 2007
    Location
    Ohio
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    2,875

    Pulling a vacuum....PROPERLY...

    This is a little thread to show MY way of pulling a proper vacuum on a system and just how quickly it can be done.

    This was an evap coil change out I did today. Lineset was disconnected in the basement for about an hour while I did sheet metal. The lineset was 30 feet long and I pumped this system down, so when the vacuum was pulled it was pulled on the lineset and evap coil only...

    The total job took 2 1/2 hours.....here's the pics....

    (sorry about some of the quality...my camera is not the best)



    Pic. 1 - My pump set up....no manifolds needed...why would you want to pull a vacuum on them anyway??



    Pic. 2 - The pump hooked to the unit....I use core removal tools to get the cores out of the way and also have a place ON THE UNIT to hook up my micron gauge. Why would you want to measure the vacuum anywhere else??

    [IMG]http://i514.photobucket.com/albums/t...8124/Pump1.jpg[/IMG]

    Pic.3 - Just before turning the pump on for the first pull....notice the time 2:09 pm and the gauge starts at 25,000 microns.

    [IMG]http://i514.photobucket.com/albums/t...8124/Start.jpg[/IMG]

    Pic 4. - 7 minutes and my gauge is at 200 microns.

    [IMG]http://i514.photobucket.com/albums/t...24/200at10.jpg[/IMG]

    Now I break this vacuum with about 2 psi of nitrogen and start the process all over again....

    Pic. 5 - This is the second pull with the vacuum and I am now at 160 microns and have been at it for just 11 minutes...

    [IMG]http://i514.photobucket.com/albums/t...24/1stPull.jpg[/IMG]

    Pic 6 - Before the last pull, I break with nitorgen and put the cores back into the system with it under a possitive pressure so not to draw moisture into the system...I only need one hose to pull and my micron gauge at this point. Here is the set up....


    [IMG]http://i514.photobucket.com/albums/t.../FinalPump.jpg[/IMG]

    Pic. 7 - After ONLY 30 minutes I have pulled 3 vacuums on this system and after being off the pump now for 5 minutes.....here is my final reading....holding steady with no rise what so ever...

    [IMG]http://i514.photobucket.com/albums/t...4/Finished.jpg[/IMG]

    This thread is not to brag or to boast....I am not an engineer nor do I claim to be the best tech in the world...but proper procedures and proper tools will make all the difference in the world!!
    I need a new signature.....

  2. #2
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    proper procedures and proper tools will make all the difference in the world!!
    AMEN to that!!!

    i still use two hoses on the last pull well i overkill everything anyways lol
    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?

  3. #3
    Join Date
    Dec 2007
    Location
    Ohio
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    Quote Originally Posted by beachtech View Post
    AMEN to that!!!

    i still use two hoses on the last pull well i overkill everything anyways lol
    So if you are using 2 hoses on the final pull...where are you hooking the micron gauge?? I was doing the final pull with my core remover still hooked up but got paranoid about allowing in air and moisture while trying to put in that last core under a vacuum??
    I need a new signature.....

  4. #4
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    lol it's a trane washed world around here, on the HP's i use the discharge port

    i rarely pump a system down too.

    worried about letting air in when disconnecting your micrin gauge, you put refer in while it is still atached to the system i sure don't
    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?

  5. #5
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,055
    Quote Originally Posted by I_bend_metal View Post
    So if you are using 2 hoses on the final pull...where are you hooking the micron gauge?? I was doing the final pull with my core remover still hooked up but got paranoid about allowing in air and moisture while trying to put in that last core under a vacuum??
    yeah your not supposed to put cores in under a vacuum.

    Why even pull the cores on such a small system?

  6. #6
    Join Date
    Jul 2001
    Location
    Anderson,SC
    Posts
    979
    Why can't you put the core back in while in a vacuum?

    I do it on each vacuum, I use the field service valve tool.

    STUD

  7. #7
    Join Date
    Dec 2007
    Location
    Ohio
    Posts
    2,875
    Quote Originally Posted by HVAC/Stud View Post
    Why can't you put the core back in while in a vacuum?

    I do it on each vacuum, I use the field service valve tool.

    STUD
    Because under a vacuum you are going to allow outside air into the system...connect your micron gauge to the core remover and watch it when you put the core back in....it's just a little bit but your microns will rise dramatically...
    I need a new signature.....

  8. #8
    Join Date
    Dec 2007
    Location
    Ohio
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    2,875
    Quote Originally Posted by y7turbo View Post
    yeah your not supposed to put cores in under a vacuum.

    Why even pull the cores on such a small system?
    Small?? That's an average size system for this area....I do resi only....and pulling cores makes things go that much faster....IMHO
    I need a new signature.....

  9. #9
    Join Date
    Oct 2008
    Location
    So Cal
    Posts
    16
    Nicely Done

  10. #10
    Join Date
    Mar 2008
    Location
    Atlanta, GA
    Posts
    149
    Quote Originally Posted by I_bend_metal View Post
    This is a little thread to show MY way of pulling a proper vacuum on a system and just how quickly it can be done.

    This was an evap coil change out I did today. Lineset was disconnected in the basement for about an hour while I did sheet metal. The lineset was 30 feet long and I pumped this system down, so when the vacuum was pulled it was pulled on the lineset and evap coil only...

    The total job took 2 1/2 hours.....here's the pics....

    (sorry about some of the quality...my camera is not the best)



    Pic. 1 - My pump set up....no manifolds needed...why would you want to pull a vacuum on them anyway??



    Pic. 2 - The pump hooked to the unit....I use core removal tools to get the cores out of the way and also have a place ON THE UNIT to hook up my micron gauge. Why would you want to measure the vacuum anywhere else??



    Pic.3 - Just before turning the pump on for the first pull....notice the time 2:09 pm and the gauge starts at 25,000 microns.



    Pic 4. - 7 minutes and my gauge is at 200 microns.



    Now I break this vacuum with about 2 psi of nitrogen and start the process all over again....

    Pic. 5 - This is the second pull with the vacuum and I am now at 160 microns and have been at it for just 11 minutes...



    Pic 6 - Before the last pull, I break with nitorgen and put the cores back into the system with it under a possitive pressure so not to draw moisture into the system...I only need one hose to pull and my micron gauge at this point. Here is the set up....




    Pic. 7 - After ONLY 30 minutes I have pulled 3 vacuums on this system and after being off the pump now for 5 minutes.....here is my final reading....holding steady with no rise what so ever...



    This thread is not to brag or to boast....I am not an engineer nor do I claim to be the best tech in the world...but proper procedures and proper tools will make all the difference in the world!!
    Fixed the images.

  11. #11
    Join Date
    Jun 2005
    Location
    South Jersey
    Posts
    1,461
    Quote Originally Posted by I_bend_metal View Post
    This is a little thread to show MY way of pulling a proper vacuum on a system and just how quickly it can be done.

    !!
    From what I learned in here recently, it's impossible to pull a proper vacuum unless you are an engineer.

  12. #12
    Join Date
    Dec 2007
    Location
    Ohio
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    2,875
    Quote Originally Posted by bustawrench1 View Post
    From what I learned in here recently, it's impossible to pull a proper vacuum unless you are an engineer.
    I don't think he has seen this thread yet....I linked the other one to this one...LOL
    I need a new signature.....

  13. #13
    Join Date
    Jun 2007
    Location
    Greenville,North Carolina
    Posts
    1,903
    By the way,good set-up/procedure.But you are not doing it right regardless because your not an know-it-all engineer.
    Look to the past to learn;look forward to live.

    Coach Dean E. Smith

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