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  1. #1
    Join Date
    Nov 2003
    Location
    Montreal, Qc.
    Posts
    761

    How low does your vacuum pump pull?

    I have 2 YJ 6 CFM vacuum pumps.
    The older unit is 15 years old and has in the past pulled down to 17 microns using my YJ 69075 vacuum gauge.
    A few weeks ago I was pulling a vacuum on a system which had a burnt out compressor and I ended up getting a lot of contamination in the pump.
    I needed 3 oil changes to get the system down to 400 microns.
    I then tested my vacuum pump and was only able to pull it down to 107 microns. 1 week and 4 oil changes later and I'm now able to pull 24 microns.

    My newer YJ 6 CFM pump which is about 2 years old has never been able to pull lower than 31 microns.

    Does anyone else test their vacuum pumps to see how deep they can pull?

  2. #2
    Join Date
    Apr 2008
    Location
    Alberta Canada
    Posts
    2,246
    Quote Originally Posted by thump_rrr View Post
    I have 2 YJ 6 CFM vacuum pumps.
    The older unit is 15 years old and has in the past pulled down to 17 microns using my YJ 69075 vacuum gauge.
    A few weeks ago I was pulling a vacuum on a system which had a burnt out compressor and I ended up getting a lot of contamination in the pump.
    I needed 3 oil changes to get the system down to 400 microns.
    I then tested my vacuum pump and was only able to pull it down to 107 microns. 1 week and 4 oil changes later and I'm now able to pull 24 microns.

    My newer YJ 6 CFM pump which is about 2 years old has never been able to pull lower than 31 microns.

    Does anyone else test their vacuum pumps to see how deep they can pull?
    Why would you want to pull something that low. You need to get a job because you have to much time on you hand. We are hiring out west!
    Do it right the first time.

  3. #3
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,403
    I'm not sure how low mine pulled... Last time i looked at the micron gauge it was around 4-5, but when I returned about 15 minutes later the micron gauge had been sucked into the hose it was pulling so hard!

    Mine will pull down into the 30-40 range reasonably quick with just a hose and micron gauge on it. I've never really let it go beyond that, and actually as long as the pump pulls below 100 (isolating the system off, just pulling manifold or micron gauge) I'm happy. If it won't I know theres either a problem or it's time for that monthly oil change lol.

    I never pull a system down that low mostly because I have other things to do, like hurry up and get home to check this site. But if I don't check the pump and it can only pull down to 800 for some reason, it's a time saver to know it's the pump and not the system that's the problem.
    "If you call that hard work, a koala’s life would look heroic."

    VETO PRO PAC, The Official Tool Bag of HVAC-Talk.com

    Testo... you guys rule!

  4. #4
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,947

  5. #5
    Join Date
    Nov 2003
    Location
    Montreal, Qc.
    Posts
    761
    Quote Originally Posted by 21degrees View Post
    Why would you want to pull something that low. You need to get a job because you have to much time on you hand. We are hiring out west!
    I usually do it once every couple of months to check the performance of my pumps and to ensure that my setup is leak and moisture free.
    I just set the pumps on my workbench and turn them on and walk away.
    When I have a moment I go back and see if they're good.

  6. #6
    Join Date
    Apr 2008
    Location
    Alberta Canada
    Posts
    2,246
    Quote Originally Posted by thump_rrr View Post
    I usually do it once every couple of months to check the performance of my pumps and to ensure that my setup is leak and moisture free.
    I just set the pumps on my workbench and turn them on and walk away.
    When I have a moment I go back and see if they're good.
    I am joking, I know I should do it once in awhile. Just No time!
    Do it right the first time.

  7. #7
    Join Date
    Mar 2008
    Location
    Florida
    Posts
    193

    Confused

    Is this a joke or am I missing out. 100 mics, not to mention 24 or 17, for what would you have to pull that type of vacuum unless your into experimenting. 300 mics for me and that was to long.

  8. #8
    Join Date
    Nov 2003
    Location
    Montreal, Qc.
    Posts
    761
    Quote Originally Posted by powerup View Post
    Is this a joke or am I missing out. 100 mics, not to mention 24 or 17, for what would you have to pull that type of vacuum unless your into experimenting. 300 mics for me and that was to long.
    I'm just deadheading the pump with the Vacuum tree and my 2 vacuum hoses and micron gauge attached.
    The goal is to verify that the manifold and hoses are tight and dry and the pump, micron gauge, vacuum tree and ball valves are in good working order.

  9. #9
    Join Date
    Apr 2008
    Location
    Alberta Canada
    Posts
    2,246
    Sounds like your good at pulling something!
    Do it right the first time.

  10. #10
    Join Date
    Mar 2008
    Posts
    624
    9 mics on my yj 6cfm. i pulled 2 mics with my bosses beat to hell yj 6cfm pump. yellow jacket does tune them up for about $90+ shipping.
    HVAC PRO IN THE MAKING
    NATE's:
    Gas Heat Service/ Installation
    Air-to-Air Heat Pump Service/ Installation
    Air Conditioning Service/ Installation

  11. #11
    Join Date
    Apr 2007
    Location
    TIP-O-TX
    Posts
    274
    Quote Originally Posted by 21degrees View Post
    Sounds like your good at pulling something!
    OOOOOOH SNAP!!!

  12. #12
    Join Date
    Jul 2006
    Location
    Southern Ca, Elkton Md
    Posts
    7,566
    My YJ 1.5 can pull down to lower then 20 microns while testing my setup.

    All of the yj pumps are designed to pull down less then 15 microns.

    This is for testing purposes of course.
    "Correct Installation is the Key"

    .1 has killed more HX then Rush Limbaugh

    What is your TESP?

  13. #13
    Join Date
    Aug 2006
    Posts
    2,552
    Try changing oil brands, and see what you get.

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