Trane® CenTraVac™ Centrifugal chillers are industry icons representing the most reliable, lowest emission, quietest centrifugal chillers on the market. The low-pressure, direct drive, multi-stage design enables CenTraVac chillers to be the most efficient chillers on the market — at least 13.5 percent better than other centrifugal chillers. Since 1938, Trane has continuously researched all technologies to ensure reliable operation with the highest efficiencies across the entire product family. These principles have been incorporated since the very first centrifugal chillers were introduced and continue today. CenTraVac chillers are among the Trane products within the EcoWise™ product portfolio and are available with either R-123 or next-generation refrigerants R-514A or R-1233zd, both featuring ultra-low global warming potential (GWP) of less than 2.