A European manufacturer has announced approval for the use of non-flammable R-513A and R-450A as lower GWP alternatives to R-134a in its bus air conditioning systems. With the alternative refrigerants, the system delivers a virtually identical performance and have the same safety classification as R-134a (Class A1). Refrigerant R-513A is an azeotrope and has a GWP of 631 compared to the GWP of 1430 for R-134a. Refrigerant R-450A has a GWP of 605 and is a zeotropic refrigerant which means the refrigerant must be handled accordingly. The manufacturer has provided guidance for the use of the new refrigerants including the required lubricant oil, and hose changes.
Source manufacturers information