CleaverBrooks CBT - Page 86

Maintenance
5-18
750-382
CBT
H. Lockout 67 ILK OFF
LOW GAS PRESSURE
H.1. Insufficient gas
supply pressure or gas
valve closed
Check gas supply pres-
sure at boiler gas valve
inlet during trial for
ignition (refer to boiler
O&M commissioning
section for minimum
pressure required).
Confirm gas shut-off
valve is open. Increase
gas supply to boiler
room and/or boiler by
increasing pressure out
of regulator. Reset
LGPS. Clear lockout on
Falcon and restart.
Check Low Gas Pres-
sure Switch (LGPS)
setting -- should be
50% of gas supply
pressure required.
Confirm gas shut-off
valve is open. Increase
gas supply to boiler
room and/or boiler by
increasing pressure out
of regulator. Reset
LGPS. Clear lockout on
Falcon and restart.
I. Lockout 67 ILK OFF
HIGH GAS PRESSURE
I.1. Manual gas shut-
off valve (between gas
safety shut-off and
venturi) closed caus-
ing gas pressure spike.
Check position of man-
ual gas shut-off valve.
Open manual shut-off
valve between gas
safety shut-off valve
and venturi. Reset
High Gas Pressure
Switch (HGPS). Clear
Falcon lockout and
restart.
Check HGPS setting --
setting should be
~150% of gas supply
pressure to boiler.
Adjust switch to appro-
priate setting. Reset
HGPS. Clear Falcon
lockout and restart.
J. Lockout 65 Inter-
rupted Airflow Switch
OFF
J.1. Combustion Air
Proving Switch (CAPS)
is not closing when
blower starts during
purge
Check air switch
(CAPS) setting; on Fal-
con Annunciation
screen check "Inter-
rupted Air Sw" status
during purge
Set CAPS to minimum
set point. Clear lock-
out and restart.
Check air switch
(CAPS) pressure tubing
connections for tight-
ness -- one is at blower
outlet, other is at
blower/venturi inlet
If loose, tighten pres-
sure connections. Clear
lockout and restart.
Check air switch
(CAPS) wiring connec-
tions -- white wire
should be connected to
COM and black wire to
NO terminal.
If wrong or not secure,
correct and secure con-
nections. Clear lockout
and restart.
If all previous tests
pass and "Interrupted
Air Sw" status during
purge does not indicate
ON:
Replace air switch
(CAPS)
Problem Display Message Possible Cause/Symp-
tom
Diagnostic Check Corrective Measures