Description
The Trane CNT03671 Air Pressure Control Switch 3″ WC max, 23 VA pilot duty is a differential pressure sensing switch used in HVAC systems to verify proper airflow conditions during furnace or packaged unit operation. It is installed in compatible equipment where it monitors pressure changes created by the inducer motor and venting system, then opens or closes an electrical circuit based on measured airflow within a calibrated range up to 3 inches water column. The switch is wired into the safety control circuit and works alongside the inducer assembly, ignition, and main control board to confirm safe operating conditions in residential and light commercial.
