Cleveland Controls FS-BO-178 Proving Switch Els PW 17895 always verify your furnace model

always verify your furnace model number before installation

While physically compatible with many shells

typically requiring no field adjustment when paired with compatible 10k ohm inputs

Whether you are performing a full pilot assembly overhaul or expanding a manifold

or a large-scale resistive heating bank

Cleveland Controls FS-BO-178 Proving Switch Els PW 17895 always verify your furnace modelThe Cleveland Controls FS BO 178 is a heavy duty, factory calibrated air flow proving switch designed for critical monitoring in duct heaters, ovens, and sophisticated HVAC energy management systems. This model features a precise, non adjustable set point of 0. 05" w. c., ensuring consistent actuation on positive pressure rise without the risk of field tampering. Built with a rugged plated housing and a high performance silicone diaphragm, the FS BO