We are going to develop a comparison between TWO refrigerant gases: the R507A and its substitute, the R448A.
- Let’s start by saying that both the R507A and the R448A are internally composed of a mixture of several gases. Therefore, although the R507A has minimal glide, it is better for both gases to be charged in liquid phase.
- The R-507A is an azeotropic blend, consisting of the gases R-125 and R-143a, each comprising 50%.
- The R507A is known for its chemical stability, good thermodynamic properties, and low toxicity. Its main application is in low and medium-temperature installations.
- On the other hand, the refrigerant gas R448A is composed of a mixture of gases: R32 at 26%, R1234ze at 7%, R134a at 21%, R125 at 26%, and R1234yf at 20%.
- The glide of R507A is very low, and lower than that of R448A. Recall that glide is the temperature change of the gas while changing phase.
- Neither R404A nor R448A harm the ozone layer.
- The R448A has a global warming potential (GWP) of 1387, whereas R507A has a GWP of 3985. Precisely this high GWP value is what condemns the use of R507A due to ecological restrictions.
- R448A is considered a replacement refrigerant for R507A in low and medium-temperature applications in the evaporator.
- The transition from R507A to R448A does not require any modification in the compressor, as the discharge temperature with R448A is very similar to that of R507A.
- R448A is a perfect substitute because it works just as well as R507A with POE type oil.
- R448A is compatible with the components and seals of an existing R507A installation.
- Both R507A and R448A are gases with a safety classification of A1, group L1, meaning they have low toxicity and are non-flammable.
