This prevents localized "hot spots" in the heat exchanger or freezing on the evaporator coil caused by lagged sensor feedback

it is optimized for direct mounting in the airstream

this original equipment part provides the exact millivolt response required by the system logic

sealing rope

If the signal drops below the 1

Lochinvar & A.O. Smith 100288430 Switch 321142-301 This prevents localized "hot spots"The Lochinvar & A. O. Smith 100288430 Low Air Pressure Switch is a critical safety component designed for high efficiency condensing boilers and water heaters. As a veteran technician knows, this normally open switch is calibrated to a precise 0. 75" water column (W. C.) set point. It serves as the primary "proof of airflow" for the inducer motor, ensuring that the combustion blower is creating sufficient negative pressure to safely evacuate flue