The rink at Mars Lakeview Arena in Duluth, Minnesota, maintained a full-size ice sheet with 1,750 pounds of R-22. The converted DX chiller system runs on a non-ozone depleting, low-GWP refrigerant , R-449A.
source https://www.achrnews.com/articles/141261-project-files-episode-18-duluth-ice-arena-converts-to-opteon-xp40
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