 PID T A <> X O2 PLANT FURNACE AIR DUCT SENSOR DEMAND PRESS ONLY IF OIL USED AS SECONDARY OR STARTUP FUEL FORCED DRAFT FAN ACT OR VFD A T PLANT DEMAND BOILER MASTER BLR DMD  PID f(x) X O2 SENSOR Base Fuel/Air Calibration <> FEEDERS AIR DUCT PRESS AIR TO GRATE OR BED FD OIL FUEL AIR TO INDUCED LINKAGE FURNACE ID OVERFIRE JACKSHAFT

FURNACE PRESS STEAM FLOW DRUM LEVEL FW FLOW PLANT DEMAND OR DRUM PRESSURE* EXCESS O2 AIR PRESS. UNDERFIRE AIR DAMPER ACTUATOR OVERFIRE AIR DAMPER FD OR VFD ICN ICN ALARM HORN ALARM HORN JACKSHAFT ACTUATOR 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)