What is the main function of the fan/limit control in a standing pilot furnace?

The main function of the fan/limit control in a standing pilot furnace is to control blower operation and temperature limits. This component plays a crucial role in ensuring that the furnace operates safely and efficiently. When the furnace heats to a predetermined temperature, the fan/limit control activates the blower to distribute warm air throughout the living space. Additionally, it monitors the temperature within the heat exchanger to prevent overheating. If the temperature exceeds safe limits, the limit control will shut off the heating process, protecting the furnace and the surrounding environment from potential damage.

By managing both the operation of the blower and the temperature thresholds, the fan/limit control ensures that the furnace operates within safe parameters while providing consistent heat. This creates a safer and more comfortable environment for the occupants.