The pressure-based control in a gas furnace heat exchanger is used to verify that which component is operating correctly?

The pressure-based control in a gas furnace heat exchanger is used to verify that which component is operating correctly?

• A. Gas Valve Operation
• B. Inducer Motor Is Running And Providing The Correct Airflow
• C. Ignition Sequence
• D. Flue Draft Status

Answer: (B)

Pressure-based controls check the draft created by the furnace inducer. They verify that the inducer motor is running and producing the correct airflow through the heat exchanger and vent path. When adequate draft is present, the pressure switch closes and the furnace can proceed to ignition; if the inducer isn’t running or airflow is insufficient, the switch stays open and ignition is halted for safety. This is why the component being verified is the inducer motor and the airflow it provides.

Pressure-based controls check the draft created by the furnace inducer. They verify that the inducer motor is running and producing the correct airflow through the heat exchanger and vent path. When adequate draft is present, the pressure switch closes and the furnace can proceed to ignition; if the inducer isn’t running or airflow is insufficient, the switch stays open and ignition is halted for safety. This is why the component being verified is the inducer motor and the airflow it provides.