Company I work for is trying to clean up a problem 8 ton Split System Heat Pump job. at 1 point we found foreign material in the AHU TXV inlet screen so we know there was contamination. The repeat problems involve reversing valve failures. the RVs will repeatedly get stuck in mid position bypassing hot gas directly back to suction side. often I can force it to re-position by applying mechanical agitation (whacking the shit out of it with a mallet) or cycling the solenoid. My diagnosis is more effects of contamination but lately I'm hearing noises about when you position a RV in the horizontal position (which it is) then oil will pool and prevent proper operation. Having no depth of experience here I'm not sure how to proceed. What would you do?
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