Its all-cast aluminum NEMA 4 enclosure houses a 17-4 PH stainless steel piezoresistive sensor

This SPST (Single Pole Single Throw) controller is specifically designed for unit heaters

ensuring consistent airflow across various duct configurations

High Thermal Stability: Specifically designed to withstand high-ambient temperatures in outdoor condensing units without early capacitance drift

Lochinvar & A.O. Smith 100166238 Switch 318820-201 Its all-cast aluminum NEMA 4The Lochinvar & A. O. Smith 100166238 Gas Pressure Switch is a critical safety component designed for high performance gas fired boilers and commercial water heaters. Featuring a 1 20" WC adjustable range, this manual reset gas pressure switch ensures system integrity by monitoring incoming or manifold gas pressure. If pressures deviate from the calibrated setpoint, the switch initiates a safety lockout, preventing hazardous combustion conditions.