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  1. 11-22-2011, 06:56 AM #1
    housed
    housed is offline Regular Guest
    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 ....
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  2. 11-22-2011, 12:16 PM #2
    marvin
    marvin is offline Professional Member*
    Join Date
    Oct 2003
    Location
    las vegas
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    1,505
    are you sure everything is positioned properly & your charge is
    correct
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  3. 12-29-2011, 09:05 AM #3
    mseng
    mseng is offline Professional Member
    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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