Lochinvar & A.O. Smith 100109151 Switch 320788-704 Robust Construction: Engineered to withstand

Robust Construction: Engineered to withstand the thermal cycling and vibration typical of high-demand hydronic loops

System Safety: Integrated 15-second pre-purge clears residual gases

the CNT3781 is frequently specified for downflow vertical positions where the heat exchanger is in close proximity to the indoor coil

Durable Construction: Built to withstand the harsh thermal environment of the burner assembly for long-term reliability

Lochinvar & A.O. Smith 100109151 Switch 320788-704 Robust Construction: Engineered to withstandThe Lochinvar & A. O. Smith 100109151 is a critical safety component designed for high efficiency BTH (Best Tankless Hybrid) water heaters and commercial boilers. This Low Gas Pressure Switch is factory calibrated to a 5" WC (Water Column) set point, serving as a primary sentry to ensure safe combustion cycles. In the field, this switch monitors the incoming gas supply pressure to prevent the burner from firing under insufficient pressure conditions,