Berner International B-24 - Manual (Page 6)

6
T R O U B L E S H O O T I N G
S Y M P TO M S C A U S E
FAN OPERATES, LITTLE 1) Check gas pilot manual cock; should be left in open position
OR NO PILOT FLAME, A N D 2) Check all gas lines for clogging and for purging of entrapped air
“TURN RESET” LIGHTS 3) Check for moisture and/or conducting dirt on Sparktrode; check
AFTER 5 SECONDS electrode for carbon “bridge” to burner, which may short out ignition
spark
4) Check for adequate pilot flame. Adjust needle valve at burner if
necessary.
FAN OPERATES, 1) Check all manual cocks in main gas line; these should be left open
PILOT IGNITES NORMALLY, in normal position
THEN GOES OUT AS 2) Check scanner; remove and clean lens; check mounting pipe nipple
“TURN RESET” LIGHTS for clogging insects, dirt or rust
3) W ith selector in “WIN” but unit not operating (i.e. door switch open-
contact with door closed), hold match or lighter flame in front of
scanner. Flame relay in Fireye chassis should pull in with audible
“click”. If not, proceed to next step
CAUTION - Before proceeding to next steps, turn selector to “OFF”,
make the changes suggested, and then return the selector to “WIN”.
This is important, because in “WIN” position, the Fireye is energized
and electrical shock could result
4) Detach #20 and #21 leads from installed scanner, attach a known
good scanner to terminals #20 and #21, and repeat previous step.
If flame relay now pulls in, install new scanner. If not, re-install leads
from original scanner and proceed to next step.
5) Repace Fireye chassis, inside control cabinet, with a known good unit,
and repeat step 3. If flame relay still does not pull in, have scanner
and chassis checked by Fireye distributor or by Berner.
FAN OPERATES, 1) W ith fan operating momentarily jumper circuit #7 to #8. This should
PILOT IGNITES NORMALLY, result in control relay CR pulling in, lighting “TURN RESET” pilot and
THEN GOES OUT AS extinguishing “LOCKOUT”. If so, insert new TDR relay (Amperite
“LOCKOUT” LIGHTS 115NO5). If not proceed to step 2
2) W ith fan operating, check for 115 volts across circuits #8 and #2
(at “coil” connections of CR control relay). If no voltage, jumper per
step 1. If still no voltage backtrack through circuits 8, 7, 6 and 5 to
determine where break in circuit exists. If 115 volts is measured
but relay does not pull in, or if relay does pull in but “LOCKOUT” remains
lit, replace CR relay
3) After either steps 1 or 2 corrective action has been taken, continue with
last two symptoms.