Enhanced Durability: Constructed with high-temperature alloys to resist flame sensor corrosion and oxidation over extended run cycles

protecting the compressor from premature failure due to rapid power interruptions or thermostat fluctuations

Look for visual signs like a "bulged" or domed top

Industry Standards: Class 2 safety rating ensures current limiting protection for the low-voltage side of the circuit

Direct Replacement: Precise fitment for the ASCO 318-247 eliminates the need for field modifications or hardware adjustments

Reznor 193810 Switch 30067439-890 Enhanced Durability: Constructed with high-temperatureThe Reznor 193810 is a heavy duty air proving switch pre mounted in a protective enclosure, engineered specifically for Reznor HVAC systems. Designed for reliability in demanding commercial and industrial environments, this differential pressure switch acts as a primary safety mechanism to verify proper combustion airflow before allowing the ignition sequence to proceed. It serves as a direct OEM replacement for legacy part numbers including Reznor