Description
The Weil McLain 511624521 Pressure Switch Kit is used to monitor system temperature and regulate electrical circuit response within heating equipment. It operates by sensing levels and activating or deactivating an internal SPST contact when the preset 1.25″ water column threshold is reached, allowing connected components such as burners or fans to respond accordingly. In boiler-based HVAC systems, it plays a safety and operational role by verifying proper swell conditions before system operation continues. Positioned within the logical pressure detection line or control circuit during servicing.
