preventing ignition if a blocked flue or restricted heat exchanger is detected

the ASCO RedHat series provides a high flow capacity (21 Cv) and is designed to handle media including natural gas

Enhanced Efficiency: Restores variable speed blower functionality to maintain high seasonal efficiency and precise airflow control

Rotational: 450 foot pounds on 1/2-inch tubing

Lennox 78W57 Pressure Switch 321894-709 preventing ignition if a blockedThe 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