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or insufficient combustion air
and BYC100G packaged units
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 FC9V100C20UP12B model
Lennox 57W79 Pressure Switch or insufficient combustion airThe 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