TXV and Overloaded Evaporator
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  1. #1
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,131

    TXV and Overloaded Evaporator

    How does a TXV handle an overloaded evaporator? Is there some type of "limit" to the amount of freon a TXV will allow to go through regardless of load conditions? Overloaded evaporators tend to happen during recovery from thermostat setback/high humidity etc.

  2. #2
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,238
    It can only open to "wide open".

  3. #3
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    5,973
    The suction pressure sensor (equalizer) force acts to close the valve.

    This is how hard shut off valves work.

  4. #4
    Join Date
    Aug 2012
    Posts
    39
    Quote Originally Posted by 54regcab View Post
    How does a TXV handle an overloaded evaporator? Is there some type of "limit" to the amount of freon a TXV will allow to go through regardless of load conditions? Overloaded evaporators tend to happen during recovery from thermostat setback/high humidity etc.
    The maximum limit of a TXV is its rated capacity, and the power element in the case of a MOP rated valve. The capacity of a TXV shouldn't be significantly greater than the design cooling capacity of the system.

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