Lennox 78W57 Pressure Switch 322056-301 specifically the 50 size models

specifically the 50 size models

you must follow local electrical codes and use appropriate conduit seals within the hazardous area installation

verify the porcelain insulators on the electrodes are not cracked

this unit supports dual sensor inputs and features 2 SPDT relay outputs along with a dedicated floating output

as it effectively eliminates the risk of simultaneous heating and cooling overlap

Lennox 78W57 Pressure Switch 322056-301 specifically the 50 size modelsThe 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