What device is primarily used to protect the burner from overheating?

The thermal switch is a critical safety device used to protect the burner from overheating. Its primary function is to monitor the temperature of the burner and, if it detects temperatures that exceed safe operational limits, it interrupts the power supply to the burner. This action helps prevent potential overheating and reduces the risk of fire or damage to the heating system.

Having a thermal switch in your oil heating system ensures that if there is a malfunction that causes excessive heat buildup, the switch will disengage the burner, allowing the system to cool down and operate within safe parameters. This is essential for maintaining reliability and safety in oil heating systems, especially in ensuring that components are not subjected to temperatures that could lead to failure or hazardous situations.

The other devices listed serve different purposes: the oil filter removes impurities from the oil to ensure smooth operation, the air compressor is typically used in systems that require air supply, and the blower motor is responsible for circulating air but does not directly address overheating issues of the burner.