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while the manual trip lever provides a mechanical method to assure shutdown during maintenance
suitable for managing various damper sizes in commercial units
ensuring proper pin-to-pin alignment and wire harness integration
Common Questions & Technical Support: Why is my Williams vent switch tripping
high-grade polymers
Lennox 78W57 Pressure Switch 322838-753 while the manual trip leverThe 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
US$ 679.50
US$ 1029.50
US$ 1034.50
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