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Forum / A-C, Heat Pumps & Refrigeration / r-22 conversion to 421a choice refrigerant
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    r-22 conversion to 421a choice refrigerant (3 Posts)

  • N/A @ 1:58 AM

    r-22 conversion to 421a choice refrigerant

    fellas this is the replacement for r-22, no many parts house carry it, but you have a EPA card and are a legitimate business I will sell it to. I have used it for years to years there is no decrease if eff, no oil changes required.

    david broome
  • Techman Techman @ 7:15 AM
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    Conversion

    how about TXV and/or orifice changeout due to new superheat readings w/ the 421a?
  • N/A @ 1:12 PM

    very simple

    if its r-22, 410a, or 421a tx valve cooling mode use sub cooling. if ts orfice, cap tube super heat. In the cooling mode always use subcooling on tx valves
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