Lennox 33W18 Pressure Switch 322027-701 this blade provides the reliability

this blade provides the reliability needed for peak summer loads

Resilient Seating: Non-metallic disc-to-metal seating resists corrosive mineral deposits and ensures automatic reseating after discharge

This maintenance-free valve is a solid component for any variable flow hydronic setup

erratic burner flames

Lennox 33W18 Pressure Switch 322027-701 this blade provides the reliabilityThe Lennox 33W18 is a critical two stage combustion air pressure switch designed for specific Lennox high efficiency furnace models. This differential pressure switch ensures secondary heat exchanger safety by monitoring the inducer motor's draft performance. With a dual setpoint configuration of 0. 20" WC 1. 32" WC, this switch accurately sequences the low fire and high fire combustion cycles. Proper calibration of the Lennox 33W18 pressure switch is