Model YVWA utilizes variable-speed technology to help cut energy costs and carbon emissions. The variable-speed drive saves energy during the 99 percent ofJohnson Controls variable-speed screw chiller operating hours spent at off-design conditions when tower-water temperatures are lower. It increases sustainability by using HFC-134a refrigerant, which has zero ozone-depletion potential. Its proprietary falling-film evaporator reduces the chiller’s refrigerant charge.

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