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specifically the 50 size models
The integrated top right regulator adjustment allows for exact manifold pressure calibration
you must follow local electrical codes and use appropriate conduit seals within the hazardous area installation
it integrates seamlessly into existing low-voltage control circuits using its coded screw terminal connections
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
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