Lennox 78W57 Pressure Switch 322838-753 Common Questions & Technical Support:

Common Questions & Technical Support: Why is my Williams vent switch tripping

this 5-blade

high-grade polymers

it features a TEAO (Totally Enclosed Air Over) enclosure

ensuring optimal outdoor air intake and energy efficiency

Lennox 78W57 Pressure Switch 322838-753 Common Questions & Technical Support:The Lennox 78W57 Pressure Switch is a high precision, factory authorized OEM replacement engineered for draft proving and airflow safety monitoring in Lennox heating and cooling systems. Specifically calibrated to actuate at 0. 27" WC (Water Column), this SPST pressure switch features a 1 4" barb connection for secure integration into existing 24V control circuits. Designed as a direct replacement for Lennox part number 101572 04, it is a critical