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High Close-off Pressure: Designed to maintain 100% bubble-tight shut-off
Enhanced System Safety: Employs close on fall logic to verify proper draft before allowing the gas valve to energize
Mechanical Leverage: The 12-inch length provides the buoyancy-to-pressure ratio required for high-capacity float valve level control
a cracked or high-resistance heating element is often the culprit
The most common sign is the inducer motor running continuously while the igniter fails to glow
McDonnell & Miller FS254 Snap Switch R-410A High Close-off Pressure: Designed toThe McDonnell & Miller FS254 Snap Switch (Part Number 120610) is a heavy duty, general purpose liquid flow switch engineered for high reliability monitoring in HVACR and industrial hydronic systems. This unit is the direct replacement for the legacy FS 254 and offers a field proven solution for starting or stopping electrically operated equipment including automatic burners, circulator pumps, and system alarms. Built with a NEMA 4 enclosure, the FS254