Brady News

The Evolution of Changeover Systems

The Evolution of Changeover Systems

Many light commercial buildings have traditionally used several single-zone, packaged rooftop units with thermostats—often because better systems were thought to be too complicated and/or too expensive to install. If “zoning” was desired in these buildings, a changeover bypass system was traditionally used; this system allowed a single rooftop unit to provide independent temperature control to several zones. However, it used a constant-speed supply fan and a centralized bypass damper, resulting in higher energy use and sound levels than other system alternatives.

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