sufficient for driving large-scale dampers and high-pressure valve assemblies

this is the official replacement limit switch for several generations of the Defender series

If your application requires a local override button or LED indicator

maintaining consistent CFM and improving indoor air quality

When replacing older Erie zone valve motors

Trane CNT4991 Pressure Switch R-410A sufficient for driving large-scale dampersThe Trane CNT4991 is a 10 inch SPST pressure switch engineered for precise atmospheric monitoring in high efficiency Trane and American Standard HVAC systems. This OEM air pressure switch features a single pole single throw (SPST) contact configuration, rated at 0. 1" WC (water column) for low pressure detection. It is designed to interrupt or complete the 24V control circuit (rated at 28 VA) when specific airflow or flue gas pressure thresholds are