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Durable Construction: Maintains structural integrity under fluctuating temperature cycles within the plenum
Designed for media temperatures up to 266°F for water and 250°F for low-pressure steam (max 15 psi differential)
Engineered for floating 3-point signal operation
Optimized for commercial water regulation
Lochinvar & A.O. Smith 100110806 Switch 319848-301 Durable Construction: Maintains structural integrityThe Lochinvar & A. O. Smith 100110806 BTH 400 Blower Prover Switch is a critical safety component designed specifically for Cyclone BTH 400 commercial water heaters. This normally open, positive air pressure switch acts as a safety interlock, verifying that the combustion air blower is generating sufficient airflow before the ignition sequence is allowed to proceed. By "proving" the blower's operation, it prevents the gas valve from opening if exhaust
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