Tandem Compressors - Page 2
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  1. #14

    Frown

    yeh not much a/c in years of drought either.

  2. #15
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,248
    I must cast my vote for paralleling these together as Dave suggested.......with the separator, reservoir and float setup. In addition, when you're looking at an oil & gas equalization deal with multiple pumps you have to strongly consider the flex and harmonic vibrations inherent in this kind of arrangement.

    Hussmann had four compressors' crankcases tied together with an 1 1/8" or 1 3/8" equalizer on their "New System" of the early seventies. D/B was doing the same thing with the "Paraflex" in the late sixties. It wasn't uncommon to walk into a very quiet compressor room to find the equalizer line, discharge manifold or suction manifold had sheared off and laying on the floor in a pool of oil.

    That's when they learned how copper will crystallize under vibrational stress and how to beef up the frame structures to eliminate the flex. Of course, then AC&R came along and solved the problem with the float controlled system.

    Listen to Dave.

  3. #16
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    Originally posted by icemeister


    Listen to Dave.
    Hehehe.

    Send money to...

  4. #17
    Join Date
    May 2004
    Location
    Caldwell, ID
    Posts
    395
    Thanks for all of the great input. I am just another dingleberry engineer, but I try to get field input so I don't build something techs cuss at too much. I've designed quite a few chillers, but they are all high temp/AC type systems.

    Most of my stuff is multiple circuit, but all of the circuits are totally independent. I am going with the tandem/parallel setup because of some serious rebate potential from the power company that the brewery owner would like to get in on. I also always use scrolls. Even the med. temp stuff is scroll (copeland ZB models). I've had no problems with the 2 dozen or so of those that I have built.

    Sounds like I should just do the whole level control system and not mess around.

    If anyone is interested I will post what happens.

    Clyde

  5. #18
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    Keep us updated, curious to see what you come up with.

    Seriously consider going with that Helical oil separator from AC&R components, and the reservoir, check valve and level regulators from Sporlan.


  6. #19
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    If you're going scroll, though, there are actual level regulators designed for them.

    I believe Sporlan makes one, but Alco is Copelands' main valve supplier, as they are both Emerson subsidiaries.

    Best to contact Copeland Application Engineering for their recommendations on scroll level regulation.

    I doubt that they'll want you to equalize those crankcases, but I could be mistaken.

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