What system monitors the burner start-up sequence and main flame during operation?

The flame safeguard system is crucial for monitoring the burner start-up sequence and the main flame during operation. This system ensures the safe and efficient operation of the burner by continuously checking for the presence of flame and managing the ignition process. If the flame goes out or fails to ignite, the flame safeguard system can quickly shut down the burner to prevent dangerous situations such as the accumulation of unburned fuel.

This system typically includes components like flame sensors, which detect whether the flame is present, and logic controls that determine if the burner should continue operating. By effectively managing these critical aspects, the flame safeguard system plays a key role in boiler safety protocols and operational reliability.

In contrast, other systems mentioned serve different purposes. The ignition control system primarily focuses on the ignition process itself, and while it is important, it does not monitor the flame after it has started. The temperature control system manages the temperature of the water or steam within the boiler but does not directly monitor the burner or flame. The pressure relief system protects against overpressure situations but does not interact with the burner operation or flame monitoring. Thus, the flame safeguard system is integral to both the initial startup and ongoing monitoring of the burner flame, making it the correct choice.