Description
The Lennox 56M04 1/2″ Pressure Switch is a control component used in gas equipment to monitor air pressure within the elements. In HVAC systems, it is installed in the inducer or venting circuit to confirm proper air flow before ignition and during operation. It responds to changes in pressure created by the inducer motor or blower and opens or closes the electrical circuit based on preset limits. It operates as a secure and control component that helps verify correct venting conditions support system startup, and prevents operation when airflow or pressure conditions are not within acceptable range.
