Solstice^® zd is a non-flammable, ultra-low GWP replacement for R-123 for low pressure centrifugal chillers offering better capacity and similar efficiency to R-123. Use in low pressure centrifugal chillers, which are most often used to cool large buildings. Trane, a leading air conditioner manufacturer, has already announced that it will use Solstice zd in its new Series E CenTraVac large capacity centrifugal chillers in Europe, the Middle East and other 50hz markets. Download our refrigerant system simulation tool which makes it easier than ever to select the right refrigerant.