CleaverBrooks CBT - Page 85

750-382
CBT
5-17
Troubleshooting
Check Auxiliary Low
Water Cut-off (ALWCO)
control LED inside con-
trol panel. Also observe
primary LWCO control
“LLCO” LED located on
Dual Function (DF-16,
larger circuit board)
located inside control
panel.
If LED remains off after
reset and LWCO
“LLCO” LED is ON,
perform water column
and boiler bottom
blowdown. Primary
LWCO (“LLCO” LED)
should go OFF during
blowdown. IF “LLCO”
LED REMAINS ON,
DISCONNECT POWER
TO FEED PUMP AND
CLOSE FEED WATER
VALVE IMMEDIATELY.
POTENTIAL LOW
WATER CONDITION
PRESENT AND MUST
BE RESOLVED!
Check ALWCO board
wiring and probe con-
nections
Secure any loose con-
nections. If corrosion
present, remove corro-
sion and/or replace ter-
minal connection.
F.2. Low water condi-
tion -- water level is
low in the sight glass --
see B. Hold 63 LCI Off
LOW WATER Display
Message, Possible
Causes, Checks, and
Corrective Measures
G. Lockout 67 ILK OFF
HIGH LIMIT
G.1. Steam pressure
exceeded High Limit
Control (HLC) set
point.
Observe steam pres-
sure gauge reading and
compare to HLC set-
ting (outside the con-
trol panel) and Falcon
OFF point.
Adjust HLC setting to
setting higher than
OLC setting and Falcon
OFF point. Reset HLC
after pressure drops
below setting. Clear
Falcon lockout and
restart.
Check position of
steam stop valve.
Observe steam pres-
sure gauge reading.
If stop valve closed,
wait for pressure to
drop enough so steam
stop valve can be
opened safely. Reset
HLC after pressure
drops below setting.
Clear Falcon lockout
and restart.
Problem Display Message Possible Cause/Symp-
tom
Diagnostic Check Corrective Measures