Lennox 78W57 Pressure Switch 322056-301 this unit supports dual sensor

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

verify the porcelain insulators on the electrodes are not cracked

it integrates seamlessly into existing low-voltage control circuits using its coded screw terminal connections

The single-pole double-throw configuration facilitates both normally open (N

Lennox 78W57 Pressure Switch 322056-301 this unit supports dual sensorThe 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