CleaverBrooks CBT - Page 90

Maintenance
5-22
750-382
CBT
L.10. Burner canister
clogged
Check for flame signal inspect burner/clean
surface. Replace
burner canister if
clogged or damaged.
Clear Lockout and try
again
L.11. No or poor flame
signal (less than 1
VDC) -- UV flame sens-
ing
Check for flame sig-
nal; Visually check for
ignition in burner sight
port
If flame observed,
inspect UV scanner;
remove and clean as
necessary and rein-
stall.
Remove UV scanner
for inspection.
Inspect scanner
mounting tube for clear
line-of-sight to burner
canister - remove any
blockages that would
inhibit scanner view-
ing.
Shut-off gas supply;
remove UV scanner
from burner mount,
with match or lighter,
place flame in front of
UV scanner -- observe
displayed flame signal
on boiler status screen
If no flame signal,
replace UV scanner
with new one. If yes,
remount UV scanner at
burner. Open gas shut-
off valve.
Clear Lockout and try
again
If condition persists,
contact factory
L.12. No or poor flame
signal (less than 1
VDC) -- flame rod sens-
ing
Check for flame sig-
nal; Visually check for
ignition in burner sight
port
If flame is observed,
remove flame rod,
inspect, clean and rein-
stall. Replace as nec-
essary based on usage
and environmental
conditions.
M. Lockout 107 Flame
lost early run
M.1. Refer to L. Lock-
out 109 Possible
Causes and Corrective
Measures
M.2. Poor combustion
tuning
With combustion ana-
lyzer, compare O2 lev-
els at HF and LF with
manual recommeda-
tions.
Retune combustion
settings as necessary.
Problem Display Message Possible Cause/Symp-
tom
Diagnostic Check Corrective Measures