R410A is under pressure to be phased down because of its high global warming potential (GWP). A new refrigerant blend, R4xxA [is expected to have an ASHRAE designation well before the conference], has been developed with thermodynamic properties that potentially makes it a design compatible replacement for R410A. This new blend offers a 65% reduction in GWP over R410A and is non-flammable (Class A1).

Tests of this new refrigerant in an air-cooled chiller were previously reported. Performance generally met expectations with capacity being within ±2 % of R410A and efficiency being 0 to 4 % higher than with R410A.

This paper presents the results of tests run with this new refrigerant in a residential heat pump, a rooftop air-conditioner, and a transport refrigeration unit.  Again, performance is generally seen to meet expectations. Capacities ranged from −5 % to +2 % relative to the R410A baselines. Efficiencies ranged from −3 % to +4 % relative to the R410A baselines.

These results demonstrate R4xxA's utility as a lower GWP, design compatible replacement for R410A in a range of HVAC&R equipment. Its non-flammable classification permits R4xxA to be used in existing equipment designs, either in new product or as field replacement of reclaimed R410A.