The purpose of a control that monitors the pressure in a gas furnace heat exchanger is to verify what?

• A. The Inducer Motor Is Running And Providing The Correct Airflow
• B. Gas Valve Operation Status
• C. Flame Sensor Alignment
• D. Condensate Drain Clearance

Answer: (A)

The pressure the control monitors in the heat exchanger is used to confirm a proper draft and airflow created by the inducer. This ensures combustion gases are drawn through the burner and vented safely, preventing backdrafting and potential CO buildup. If the pressure is out of range, the control can inhibit ignition or shut down to protect safety, which is why the function is to verify that the inducer motor is running and delivering the correct airflow.

The other concerns are not what this pressure signal checks: gas valve operation status is determined by valve actuation signals, flame sensor alignment relates to flame detection rather than draft, and condensate drain clearance deals with moisture removal, not combustion air flow.