York S1-025-41318-000 M/R Limit Switch 250°F

The York S1-025-41318-000 Limit Switch Manual Reset is a temperature-sensitive control that is installed in HVAC systems to break electrical circuits when internal heat is detected to be too high. It is adjusted to close its contact at 250°F and it has been activated, which prevents overheating of heat exchangers, blower parts and control circuitry. The heat exchanger or duct opening with its sensing element that identifies high temperature and is connected to the control wiring.