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  1. #1
    Join Date
    Dec 2006
    Posts
    4

    water cooled heat pump

    we recently replaced a mammoth wshp with a mcquay wshp the only difference betwwen the two is the mammoth had a tube in tube condenser coil and the mcquay has a slant fin (plate) style.we are having water flow problems,low water pressure diferential,when the unit is hooked to the loop we run high head pressure with a 30 degree differential inlet to outlet,but when we disconnect the outlet of the unit and free flow pressures run normal and differential drops to 18 degrees inlet to outlet.what do you think not enough water pressure,or are we missing somthing?

  2. #2
    Join Date
    Aug 2006
    Posts
    2,609
    Drain the system and manually run pipe clean springs down the return line. Was there a place a dielectric union should have been used? Pull that connection and look for build-up. Had some ball valves made in India, the opening thru the ball was so small it was a restriction. Did you use the same hoses? They should be replaces with SS braid Fire Code hoses. The old ones will come apart on the inside and restrict the flow, not to mention burst in the middle of the night.

  3. #3
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    Quote Originally Posted by jimmyv View Post
    we recently replaced a mammoth wshp with a mcquay wshp the only difference betwwen the two is the mammoth had a tube in tube condenser coil and the mcquay has a slant fin (plate) style.we are having water flow problems,low water pressure diferential,when the unit is hooked to the loop we run high head pressure with a 30 degree differential inlet to outlet,but when we disconnect the outlet of the unit and free flow pressures run normal and differential drops to 18 degrees inlet to outlet.what do you think not enough water pressure,or are we missing somthing?
    your supply pressure is fine obviously

    your outlet is clogged somewhere, now that you know that, its up to you to find the restriction in the outlet!



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