Cleveland Controls AFS-531-328 Switch 326070-701 If you see an open

If you see an open circuit or high resistance

wire to the terminals that open on pressure rise

This kit includes the necessary solid-state components and lead wires to handle high-amperage cycles without premature thermal degradation

requires a 150A circuit protection or isolation point

including steam tables

Cleveland Controls AFS-531-328 Switch 326070-701 If you see an openAs a seasoned contractor, you know that proving fan status and monitoring pressure drops requires a switch that doesn't drift. The Cleveland Controls AFS 531 328 is a professional grade differential air pressure switch designed for precision in HVAC, energy management, and industrial ventilation. Featuring a field adjustable setpoint range of 0. 05" to 1. 0" w. c., this unit allows for fine tuning to meet specific economizer or proving switch