Lennox 57W79 Pressure Switch Common Questions & Technical Insights

Common Questions & Technical Insights What is the primary function of a slinger in a rooftop unit

Using an OEM furnace limit switch is highly recommended to ensure the mounting footprint and thermal response curve match the original safety specifications of the floor furnace

including the 20 FLA rating and 24V coil requirement

maintaining a crisp

including the FC9V100C20UP12B model

Lennox 57W79 Pressure Switch Common Questions & Technical InsightsThe Lennox 57W79 Pressure Switch is a critical OEM safety component engineered for precise inducer draft monitoring in Lennox gas furnaces. Calibrated to a 0. 70" WC activation setpoint, this green pressure switch ensures the combustion blower is establishing sufficient static pressure before allowing the ignition sequence to proceed. As a direct furnace pressure switch replacement, it resolves common fault codes related to airflow verification and