Lennox 17U20 Pressure Switch 320720-756 Perform a phase-to-phase resistance check

Perform a phase-to-phase resistance check on the motor pins

In a normally open configuration

Serviceable Design: The internal color indicator element is replaceable using a Sporlan K-SA-4 kit

Superior Compatibility: Direct physical and electrical upgrade for the obsolete 90-162

Lennox 17U20 Pressure Switch 320720-756 Perform a phase-to-phase resistance checkThe 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