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  1. #1
    Join Date
    Nov 2005
    Location
    USA
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    211
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    frost on TXV diaphragm during startup



    On my CPU cooler, the TXV diaphragm will sometimes frost up for a while during startup. The frost disappears after a few minutes.
    Will that cause problems with the TXV? I think the cause is liquid migrating into the diaphragm when the system is off, causing a heatpipe effect when the bulb cools quickly. Should I install a small resistor near the diaphragm to prevent liquid buildup? Or is it nothing to worry about?


    "If Hannah was an air handler, I would be a condensing unit so I could open her TXV and pump my refrigerant through her coils." - a HVAC friend of mine

  2. #2
    Join Date
    Mar 2006
    Location
    Merate (LC) - Italy
    Age
    52
    Posts
    2,554
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    Re: frost on TXV diaphragm during startup

    I think you've got it. If possible, a liquid solenoid would be the best option, but otherwise just apply some insulation on the TXV body. No problems to the TXV, but I think the the frost thawing could release water on the PCB board.

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