What is the purpose of a blower limit switch in gas heating systems?

The blower limit switch is a crucial safety component in gas heating systems, and its primary function is to protect the furnace from overheating. This device monitors the temperature within the furnace and ensures that the blower motor operates at the appropriate times. If the furnace's heat exchanger gets too hot, the limit switch will turn off the burner to prevent overheating, which could lead to equipment damage or even hazardous situations like a fire. By ensuring that the temperature remains within safe limits, the blower limit switch safeguards both the furnace and the surrounding environment, thus playing a vital role in the overall safe operation of the heating system.

While other options refer to aspects related to heating systems, they do not directly pertain to the specific role of the blower limit switch. For example, regulating indoor humidity, enhancing energy efficiency, and monitoring fuel consumption involve other components and practices outside the purview of this safety device.