What is the purpose of primary and secondary controls in a heating system?

The purpose of primary and secondary controls in a heating system is fundamentally about managing system operation and safety functions. Primary controls typically oversee the general operation of the heating system, ensuring that it runs efficiently and effectively. This can include functions like ignition control and flame monitoring, which are crucial for safe operation. Secondary controls, on the other hand, often serve to enhance safety and performance, such as implementing limits for temperature or pressure and providing backup systems in case of primary failures.

This layered control approach is essential for preventing unsafe conditions, such as overheating or improper functioning, which could lead to more significant issues or system failures. Therefore, the primary and secondary controls work together to maintain a safe and efficient heating environment.