What is the first event that occurs in a firing cycle for a boiler?

The correct process in the firing cycle of a boiler begins with ensuring that safety controls must be in the circuit prior to any ignition. Safety controls are critical as they ensure that the boiler operates within safe parameters, preventing potentially hazardous situations from arising. Before fuel is ignited, it’s essential to verify that all necessary safety devices, such as pressure switches, flame scanners, and water level controls, are functioning properly. This ensures that the system will shut down or prevent ignition if any unsafe conditions are detected.

Ignition of fuel cannot occur safely without first confirming that the safety infrastructure in place is working correctly. Following this, checks on the water level, flame monitoring, and finally ignition take place in succession, but prioritizing safety ensures that the system will operate safely throughout its cycle.