WaterFurnace’s waterside economizer passes air through an internal coil cooled by loop water rather than by mechanical refrigeration. The unit contains a water-to-air heat exchanger, a three-way valve and controls that manage water flow through the heat exchanger.
WaterFurnace waterside economizer
![WaterFurnace](http://www.supplyht.com/ext/resources/SHT/2015/Sept-2015/Products/sht0915_Products_WaterFurnace.jpg?1444061812)