Description
The Supco SHL504 Gas Furnace Limit Thermostat is a high-limit protection control part used in furnace heating assemblies to prevent excessive temperature units in HVAC systems. It has a 240F to 40F range to provide automatic shutdown protection when the chamber or discharge air becomes hot. It is placed in gas furnace systems, where it monitors the heat exchanger or air outlet temperatures and interrupts burner operation under certain conditions. It is used to ensure the thermal protection for internal components and maintain consistent furnace operation during heating conditions.
