1.  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

2. 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)