We are going to develop a comparison between TWO refrigerant gases. We’re talking about R404A and its substitute, gas R448A.
- Let’s start by saying that both R404A and R448A are internally composed of a mixture of several gases, which is why both should always be charged in liquid phase.
- For example, R404A contains approximately 4% R134A, 44% R125, and 52% R-143A.
- Meanwhile, refrigerant gas R448A is composed of a mixture of gases as follows: R32 (26%), R1234ze (7%), R134a (21%), R125 (26%), and R1234yf (20%).
- The glide of R404A is very low and lower than that of R448A. Remember, glide is the temperature change of the gas during phase transition.
- Neither R404A nor R448A damage the ozone layer.
- R448A has a global warming potential (GWP) of 1387, while R404A has a GWP of 3920. It is precisely this high GWP value that condemns the use of R404A due to environmental restrictions.
- R448A is considered a replacement refrigerant for R404A in low and medium-temperature applications in the evaporator.
- The change from R404A to R448A does not require any modification in the compressor because the discharge temperature of the R448A is very similar to that of R404A.
- R448A is a perfect substitute because it works just like R404A with POE-type oil.
- R448A is compatible with the components and seals of an existing R404A installation.
- Both R404A and R448A are gases with a safety classification of A1, group L1, meaning they have low toxicity and are not flammable.
