Lochinvar & A.O. Smith 100208666 Cutoff R-410A Precision Timing: High-accuracy internal circuitry

Precision Timing: High-accuracy internal circuitry maintains consistent delay intervals for optimized heat transfer

What is the difference between the SAN50D and SAN50S

Reliable Safety Lockout: Manual reset functionality prevents automatic restarts in hazardous high-temperature conditions

if the circuit is open and the furnace is cool

Lochinvar & A.O. Smith 100208666 Cutoff R-410A Precision Timing: High-accuracy internal circuitryThe Lochinvar & A. O. Smith 100208666 Low Water Cutoff Manual Reset is a critical safety component designed to protect high efficiency hydronic systems. As a direct OEM replacement part for WTR2530 and WTR2530K, this probe type LWCO sensor ensures the burner circuit remains de energized during low water conditions, preventing catastrophic heat exchanger failure or "dry firing." Engineered specifically for the Lochinvar Power Fin series (models PB PF