Zonefirst® SPS Static Pressure Switch, SPST Snap Acting Electronic
Zonefirst® Static Pressure Switch, SPST Switch, Snap Acting Electronic, 0.2 in WC Close, 0.3 in WC Open Pressure
The SPS is used to sense duct pressure and control the modulating damper to provide more accurate control of by-pass air in zoned system. Its two fixed sensors are factory set at 0.2 in and 0.3 in S.P. The modulating by-pass damper is wired to open above 0.3 in and close below 0.2 in. The damper stops between these pressures.