Lennox 69W39 Limit Control 190F

The Lennox 69W39 Limit Control is a device for your HVAC system to function. It is a fail safe switch that shuts down the furnace or air handler if the temperature goes above a set point. In the case of the 69W39, that limit is 190°F (87.8°C). The limit control is a small component with a button style reset mechanism. Typically installed on the airflow pathway in your furnace or air handler, it’s installed directly on the airflow pathway. The limit control senses air temperature and ensures safe operation.