Diagnosing Improper Fixed Orifice Sizes

  I have found that this topic often goes unnoticed, or can be a guessing game out there in the field.  Diagnosing improper fixed orifice sizes is actually a fairly simple, cut and dry procedure.  First, I would argue for efficiency reasons, as well as ease of proper charging, you should just field install a TXV.  Of course, when you are on the job site you don't want to spend precious time attempting to adjust refrigerant charge with the incorrect orifice. You would never be able to get the Superheat and Subcooling within proper parameters.  The next best thing to field installing the TXV is actually installing the correct orifice to match the condensing unit - which is why they are shipped accordingly.

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