A blend of R-22 and R-143a and R-125 intended for retrofitting R-502 refrigeration systems. This blend has the closest pressure/temperature match to R-502 across the
whole operating range of temperatures. One study suggests higher energy efficiency after retrofit compared to running with R-502. Discharge temperature will increase, however in
most applications this will not impact system performance or long term reliability. In severe duty applications, such as transport refrigeration into hot climates, this blend may not
be recommended by the OEM.