Lennox 73W33 Pressure Switch 318518-761 The 120Vac solenoid is protected

The 120Vac solenoid is protected by a NEMA 4X enclosure

but will break the control circuit if sufficient oil pressure isn't established or sustained within the 2-minute release window

Enhanced Safety: Provides reliable thermal protection to prevent heat exchanger cracking and potential fire hazards

Enhanced Protections: Features an onboard 3-amp fuse and solid-state fan blower control logic to prevent common failures associated with mechanical timers

and CSC-3000 series controllers

Lennox 73W33 Pressure Switch 318518-761 The 120Vac solenoid is protectedThe Lennox 73W33 is a high precision dual stage pressure switch engineered for specific Lennox furnace models and air handlers. This OEM replacement pressure switch serves as a critical safety component, monitoring the pressure differential within the combustion blower. With setpoints calibrated at . 68 . 35 WC, it ensures proper venting and blower performance before allowing the ignition sequence to proceed. As a two stage pressure switch, it manages