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

it is rated for LP (7

When replacing older Erie zone valve motors

With a maximum inlet pressure of 1/2 PSI and a factory-calibrated outlet pressure range of 2

allowing the system to react instantly to dynamic load changes

Trane CNT4991 Pressure Switch R-410A this is the official replacementThe 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