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  1. #1

    Low Temp R404 TXV setting

    If this topic exists somewhere else, I can't find it.

    How do you calculate superheat for low temp R-404a, suction pressure being 19psi, which is -16 degrees, subtracted from 19 degree suction line, close to the txv bulb. In simple math -16 subtracted from 19 would be 35 because two negatives in math make a positive causing 16 to be positive and the sum would be 35. Does it work this way in dealing with superheat when the pressure converted to temperature is a negative number and the suction line temperature is a positive number? Can someone please give me an example and clear this up for me.

  2. #2
    Join Date
    Sep 2008
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    Western PA
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    24,947
    Quote Originally Posted by cdklos View Post
    If this topic exists somewhere else, I can't find it.

    How do you calculate superheat for low temp R-404a, suction pressure being 19psi, which is -16 degrees, subtracted from 19 degree suction line, close to the txv bulb. In simple math -16 subtracted from 19 would be 35 because two negatives in math make a positive causing 16 to be positive and the sum would be 35. Does it work this way in dealing with superheat when the pressure converted to temperature is a negative number and the suction line temperature is a positive number? Can someone please give me an example and clear this up for me.
    Your math is correct.

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