Description
The Lennox 78L67 Limit Switch is a temperature-actuated safety control designed to monitor, and regulate heat levels within furnace and heating system operation. It is rated to open at approximately 140F and close at around 100F, allowing it to interrupt and restore the electrical circuit based on internal temperature conditions during system cycles. The switch is installed in compatible furnace assemblies during servicing or replacement procedures, where it connects to the safety control circuit to monitor heat exchanger performance. Within HVAC systems, it operates as a protective limit part that helps prevent overheating and supports safe operational cycling of the equipment.
