Durable Sealing: Viton (FKM) elastomers withstand fluid temperatures up to 230°F and provide excellent chemical compatibility

Integrated compressor short cycle protection extends compressor lifespan

It requires the airflow from the fan blade it is driving to maintain proper operating temperatures and prevent thermal tripping

Designed for reliability at altitudes between 0 and 1

System Protection: Acts as a robust pre-filter

Lennox 17U20 Pressure Switch 321894-709 Durable Sealing: Viton (FKM) elastomersThe Lennox 17U20 Pressure Switch is a high precision sensing component engineered for critical monitoring in residential and commercial HVACR systems. This OEM Lennox 104371 10 replacement part is designed to actuate at 1. 00 inch W. C., providing essential safety interlocking for furnace draft inducer motors and air handling units. Built with a sensitive diaphragm and a robust SPST N. O. contact configuration, it ensures the electrical circuit closes