Description
The Lochinvar & A.O. Smith 100208381 Pressure Switch Kit is a pneumatic sensing component calibrated to respond at 3.0 inches of water column pressure, converting airflow changes into an electrical switching signal. It uses a diaphragm-based sensing element that reacts to differential pressure changes from the inducer or venting circuit, opening or closing contacts based on preset airflow conditions. For HVAC systems such as gas-fired boilers, water heaters, and condensing heating units, it is connected to the venting and combustion air pathways through pressure tubing. The switch regulates ignition sequencing by verifying adequate draft conditions, maintaining controlled combustion operation and stable system response during airflow variation cycles.
