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This Concept Map, created with IHMC CmapTools, has information related to: Node_03c bnr mgt, green purge airflow satisfactory & purge in progess lights illuminate when purge sequence commences Burner 1 will light automatically, boiler operates in Low Fire Mode indicated by Combustion Control in Low Fire Lamp, first 3 purge premissive lights are illuminated permissive lights 3. All Burner Oil Valves (BOTV) closed, Burner Management Port/Starboard select AUTO for the Boiler Firing Mode, Burner 1 will light automatically Left & Right flame scanners show the flickering with an average value of around 5, first 3 purge premissive lights are illuminated Press Boiler Firing START button for at least 5 seconds, for the Boiler Firing Mode configures Burner Management System for Remote Automatic operation, Burner 1 will light automatically wait for Burner 1 START light to be steady Click Burner 2 START button to light second burner, boiler operates in Low Fire Mode once positive value of drum steam pressure is established close the Air Vent, for the Boiler Firing Mode check first 3 purge premissive lights are illuminated, fuel and air controllers are overridden by a low set point signal in order to produce low flame intensity and limit the rate of thermal expansion *NOTE drum level rises slowly due to thermal expansion., Boiler Firing START button for at least 5 seconds Purge sequence commences once green purge airflow satisfactory & purge in progess lights illuminate, boiler operates in Low Fire Mode during this time fuel and air controllers are overridden by a low set point signal in order to produce low flame intensity and limit the rate of thermal expansion, Burner 1 will light automatically Left & Right flame scanners will periodically read zero for a few seconds during a self-check, Boiler Firing START button for at least 5 seconds All Burner Air Registers Open Lamp illuminate, Click Burner 2 START button to light second burner automatically Burner Management System open the BOTV for burner 2, insert the igniter, ignite the flame and withdraw the igniter, close the Air Vent all the air will be expelled from the drum, close the Air Vent wait boiler pressure to reach 1500kPa, green purge airflow satisfactory & purge in progess lights illuminate *NOTE During the purge process the Burner Management System overrides the Air Control PID and opens the air damper fully. After the purge is complete, the PURGE control of the air damper is restored to the Air Control PID. The control system checks the drum water level and, if satisfactory, illuminates the WATER LEVEL SATISFACTORY light, opens the Main Oil Trip Valve (MOTV) and gives PERMISSION TO LIGHT BURNERS. An unsatisfactory water level will cause a boiler trip, Click Burner 2 START button to light second burner Drum Steam Pressure below 650psi boiler operates in Low Fire Mode