The 2017 edition includes four new zeotropic blends – Arkema’s R459A and three Mexichem blends R459B, R460A and R460B.
The characteristics and allowable levels of contaminants of these new refrigerants can be found in Table 2A of this standard. In addition, the unsaturates requirement is set to 0.5% by weight in this version to align with the EPA’s Protection of the Stratospheric Ozone: Update to the Refrigerant Management Requirements Under the Clean Air Act. This change is reflected in the tables by removing the individual unsaturates requirement, as the unsaturates requirement is now consistent for all refrigerants.
The revised standard can be downloaded here.
Four new refrigerants seek ASHRAE approval – 2 September 2016
USA: The number of potential new lower GWP refrigerants continues to rise with four more proposed for inclusion in ANSI/ASHRAE Standard 34-2013. Read more…