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  1. #27
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    First, time is not an accurate measurement of system evacuation. Second by not using core removal tools, the size of the port has been reduced to 3/16 of an inch thereby defeating the purpose of a 1/2 inch vacuum line.

  2. #28
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    Well if you watch the video I'd disagree with you in this case, it was for all intents and purposes the same setup. 6 minutes is a considerable amount of time when the only variable is the pump, this of course is my opinion and I'll be awaiting redicule because of it. Last time I checked, a recovery tank doesn't have cores anyway.
    I am the Stig

  3. #29
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    RAM Teaching Tomorrows Technicians Today.

  4. #30
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    RAM Teaching Tomorrows Technicians Today.

  5. #31
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    RAM Teaching Tomorrows Technicians Today.

  6. #32
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    RAM Teaching Tomorrows Technicians Today.

  7. #33
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    Quote Originally Posted by addamsmasher View Post
    Well if you watch the video I'd disagree with you in this case, it was for all intents and purposes the same setup. 6 minutes is a considerable amount of time when the only variable is the pump, this of course is my opinion and I'll be awaiting redicule because of it. Last time I checked, a recovery tank doesn't have cores anyway.
    Now you did it you got my cousin on a roll.

  8. #34
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    Now now, just edemucating the young'n
    RAM Teaching Tomorrows Technicians Today.

  9. #35
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    thanks for the info....always appreciate the cornucopia of knowledge you offer. I take it you guys didn't watch the video. he was pulling from a recovery tank equalized with ATM. He picked an arbutrary level of 200 microns. Obviously his test was far from laboratory but I think it gave a general idea of the performance characteristics of each vacuum pump.... btw, I get paid by the hour I don't watch the clock
    I am the Stig

  10. #36
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    Sep 2008
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    What point of 1/2" fittings anyway? I haven't seen any equipment, new or old, with anything larger that 3/8" fittings on charge and purge type valves, and those are on BIG stuff.

    If you could pull through 1/2" fittings, then it would make a bit more sense to me. 3/8" at least, but 1/2" to 1/4" is a BIG reduction.

  11. #37
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    Nov 2000
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    Upstate, SC
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    Quote Originally Posted by jpsmith1cm View Post
    What point of 1/2" fittings anyway? I haven't seen any equipment, new or old, with anything larger that 3/8" fittings on charge and purge type valves, and those are on BIG stuff.

    If you could pull through 1/2" fittings, then it would make a bit more sense to me. 3/8" at least, but 1/2" to 1/4" is a BIG reduction.
    That I tend to agree with, but the sales rep said using the 1/2" holes with the cores removed from the 1/4" fittings does work. I will soon see because our local distributor is allowing me to use one of the pumps and the setup for 90 days. I made my own 3/8" fittings to use with my 6 cfm pump years ago and it did indeed make a difference even though I still had to connect to the smaller fittings on the equipment.

  12. #38
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    Sep 2008
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    I use a 3/8" hose on a brute manifold for pulling vacuum, but I also use all 3 1/4" hoses.

    My pump used to have a 1/2" port of it that I swapped out with 3/8 for that purpose.

    I don't really know that it makes a huge difference.

  13. #39
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    Quote Originally Posted by addamsmasher View Post
    thanks for the info....always appreciate the cornucopia of knowledge you offer. I take it you guys didn't watch the video. he was pulling from a recovery tank equalized with ATM. He picked an arbutrary level of 200 microns. Obviously his test was far from laboratory but I think it gave a general idea of the performance characteristics of each vacuum pump.... btw, I get paid by the hour I don't watch the clock
    Sorry "Grasshopper", I did watch the video and to me the time thing does not prove a thing.
    Pulling a good vacuum on a system and sweeping with nitrogen is the proper way of doing this.
    As far as 1/2" lines go, Bill Schaffer from Lennox made an excellent video showing the benifits of a larger vacuum line and the cores removed.
    Addamsmasher FYI very few Commercial Refrigeration Systems also do not have valve cores.
    RAM Teaching Tomorrows Technicians Today.

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