What safety mechanism is typically included in an oil heat system?

A high limit switch is a critical safety mechanism in an oil heat system. It is designed to prevent overheating by automatically shutting off the burner if the temperature exceeds a predetermined limit. This helps to ensure safe operation and prevents potential hazards such as fires or equipment damage due to excessive heat. The high limit switch acts as a protective device by monitoring the system temperature and providing an immediate response if it rises to unsafe levels.

Other components like a flow meter, oil pressure gauge, and thermostatic expansion valve serve important functions within the system but are not primarily safety mechanisms. The flow meter measures the oil flow rate, the oil pressure gauge monitors the pressure within the oil lines, and the thermostatic expansion valve regulates the refrigerant flow in cooling systems. While these components contribute to the efficient operation and monitoring of the system, they do not directly intervene to prevent dangerous operating conditions as a high limit switch does.