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O2 SENSOR. PLANT DEMAND. FURNACE PRESS. AIR DUCT PRESS. OIL DMD. JACKSHAFT. O2 MASTER. OIL MASTER. BOILER MASTER. BLR DMD. AIR TO OIL. OIL DMD. A. A. A. T. T. T. <>. A. A. FD MASTER. ID MASTER. . . . FUEL DMD. FEEDERS. PID. PID. PID. A. A. A. A.
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O2 SENSOR PLANT DEMAND FURNACE PRESS AIR DUCT PRESS OIL DMD JACKSHAFT O2 MASTER OIL MASTER BOILER MASTER BLR DMD AIR TO OIL OIL DMD A A A T T T <> A A FD MASTER ID MASTER FUEL DMD FEEDERS PID PID PID A A A A A A X X T T T LINKAGE LINKAGE f(x) f(x) f(x) f(x) OVERFIRE AIR ACT OR VFD ACT OR VFD INDUCED DRAFT FAN FORCED DRAFT FAN AIR TO GRATE OR BED Base Fuel/Air Calibration ONLY IF OIL USED AS SECONDARY OR STARTUP FUEL
EXCESS O2 AIR PRESS. OVERFIRE AIR DAMPER ACTUATOR FD ACTUATOR OR VFD ALARM HORN ALARM HORN UNDERFIRE AIR DAMPER ACTUATOR JACKSHAFT ACTUATOR PLANT DEMAND OR DRUM PRESSURE* FURNACE PRESS FW FLOW DRUM LEVEL STEAM FLOW ICN ICN ALARM HORN ID DAMPER ACTUATOR FW VALVE FEEDER(S) *PLANT DEMAND if there is a Plant Master controller DRUM PRESSURE if there is no Plant Master (requires steam pressure transmitter)