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  1. #1
    Join Date
    Nov 2011
    Posts
    9

    expansion valve problem

    We have a situation with a water to water heat pump.

    If the bulb of the expansion valve is stick to the pipe , after 30 sec is closing the flow and the pressure goes up (at 20 C is reaching 2.5 mpa)

    If we remove it from the pipe, and is not regulating the flow, the heat pumps works perfect.

    It is a thermal expansion valve from Emerson ....

  2. #2
    Join Date
    Oct 2003
    Location
    las vegas
    Posts
    1,505
    are you sure everything is positioned properly & your charge is
    correct

  3. #3
    Join Date
    Dec 2011
    Location
    USA
    Posts
    66
    Is it a water furnace? They had a bad batch of TXV's that when out. It sounds like the TXV has lost some of its head charge.

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