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Refrigerant Name
Chemical Type
ASHRAE Safety Classification
Compressor Type
Pressure Type
Current Use
Largest Concerns
Johnson Controls Position
R-134a HFC A1 Screw and Centrifugal Medium Wide use across global screw and centrifugal chillers GWP Best option for screw and centrifugal chillers
R-450a Blend A1 Screw and Centrifugal Medium Drop-in alternative to R-134a Availability and Cost  
R-513a Blend A1 Screw and Centrifugal Medium Compatible with YORK screw and centrifugal chillers Availability and Cost Best future compatible option for YORK screw and centrifugal chillers
R-410A HFC A1 Scroll Medium Wide use across global scroll chillers GWP Best option for scroll chillers
R-123zd HFO A1 Screw and Centrifugal Low Proposed alternative to low pressure refrigerants Availability and Cost Additional research is needed
R-1336mzz HFO A1 Screw and Centrifugal Low Low pressure    
R-123 HCFC B1 Screw and Centrifugal Low Trane continues to utilize in centrifugal chillers Phase out Does not offer
R-1234yf HFO A2L Screw and Centrifugal Medium Used in automotive (the blended HFO in 513a) Flammability, Availability and Cost Codes and standards need to be in place prior to wide use of flammable refrigerants
R-1234ze HFO A2L Screw and Centrifugal Medium Proposed alternative to medium pressure refrigerants Flammability, Availability and Cost Codes and standards need to be in place prior to wide use of flammable refrigerants
R-32 HFC A2L Scroll Medium Proposed alternative to R-410A Flammability, Availability and Cost Codes and standards need to be in place prior to wide use of flammable refrigerants
R-717 (ammonia) natural B2     Used in many industrial applications Flammability Used in some industrial applications
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