is a low and medium temperature retrofit blend for R-22 refrigeration
and air conditioning systems. With properties very similar to
R-22, components such as TXVs do not need to be changed. In most
cases there will also be no need for an oil change, making R-422D
the most economical retrofit solution for R-22 refrigeration
systems. Because R-422D has a lower discharge temperature, most
low temp R-22 systems will no longer engage the liquid injection
module. This will result in significant savings in energy use
and a boost in capacity compared to running with R-22.
component in R-422D helps promote oil return in systems containing
mineral oil or alkylbenzene. Although
HFC refrigerants won’t mix with these oils, the hydrocarbon
addition thins the oil and keeps it moving around the loop.
More complicated piping arrangements or large hold-up volumes
may still require some oil be changed to POE.