Lochinvar & A.O. Smith 100208377 Pressure Switch 318973-401 Replacement intervals generally range from

Replacement intervals generally range from 3 to 6 months depending on local environmental factors and odor concentrations

Built to withstand operating temperatures from -40°F upward

Precision Engineering: The 1

Pro-Grade Contact Material: Self-wiping silver alloy contacts ensure clean breaks and long-term conductivity in 120V circuits

Durable Construction: Built to withstand commercial HVAC environments

Lochinvar & A.O. Smith 100208377 Pressure Switch 318973-401 Replacement intervals generally range fromThe Lochinvar & A. O. Smith 100208377 Pressure Switch is a critical safety component designed for precise combustion blower monitoring in high efficiency condensing water heaters and boilers. This OEM pressure switch kit is factory calibrated to a 3. 00" WC (Water Column) set point, ensuring the integrated control board verifies proper venting and inducer fan performance before allowing the ignition sequence to proceed. It is a direct replacement for