CleaverBrooks CBT - Page 84

Maintenance
5-16
750-382
CBT
C. Demand: Steam
Burner state: Standby
(normal)
C.1. Steam pressure is
greater than Falcon ON
point (SP - ON hystere-
sis)
Note Modulation set
point, ON and OFF
points on status screen
Change steam Set
Point, On hysteresis,
and Off hysteresis
parameters to desired
settings.
Check steam stop
valve -- open or
closed?
If closed, carefully
open steam stop valve
to allow steam to flow
to the process. Also,
carefully blowdown
boiler to relieve steam
pressure.
D. Hold 100 Pressure
sensor fault
D.1. Disconnected
steam pressure trans-
mitter -- Falcon Steam
pressure reads
"SHORT" or "OPEN".
Check steam pressure
transmitter wiring con-
nections - refer to
boiler wiring diagram
If loose, open, or
shorted transmitter cir-
cuit, secure wiring con-
nections
D.2. Failed steam pres-
sure transmitter -- Fal-
con Steam pressure
reads "SHORT" or
"OPEN".
Reset Falcon controller.
Check steam pressure
reading on Falcon dis-
play.
Replace steam pres-
sure transmitter
E. Hold 131 Fan
movement during
standby
E.1. High negative
draft condition and fan
turning while burner is
off
Check draft presure at
boiler flue outlet (+/-
0.25" w.c. allowed)
Resolve draft condi-
tion (e.g. adjust stack
damper) to near neu-
tral (0" w.c.)
Check if blower is turn-
ing when not on (e.g.
high negative draft can
force blower to turn)
Resolve draft condi-
tion (e.g. adjust stack
damper) to near neu-
tral (0" w.c.)
Boiler will not start --
active lockout/alarm
F. Lockout 67 ILK OFF
AUX LOW WATER
F.1. Low water condi-
tion occurred, but
water level in sight
glass now appears nor-
mal.
Check Auxiliary Low
Water Cut-off (ALWCO)
control LED located on
Warrick Single Func-
tion board (smaller cir-
cuit board) located
inside control panel.
If ALWCO control
board LED is off, reset
ALWCO switch. Clear
Falcon lockout and
restart.
Problem Display Message Possible Cause/Symp-
tom
Diagnostic Check Corrective Measures