Lennox 33W18 Pressure Switch 322027-701 What is the primary function

What is the primary function of the S11 switch in this kit

Common Questions: What causes a burner assembly to fail

maintaining the original system's AFUE ratings and operational safety without the need for field modifications

this blade provides the reliability needed for peak summer loads

Operating at 460V and 1100 RPM

Lennox 33W18 Pressure Switch 322027-701 What is the primary functionThe 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