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2. ERROR TYPES AND SAFE SHUTDOWN
If a critical error related to safety operation (such as a loss of flame, opening of the air flow switch during the ignition trial
and run sequence) is detected, the DBC2000 instantly goes into lock-out and goes to pre-purge status.
If a non critical error (such as opening of the air flow switch opening during post-purge) is detected, DBC2000 holds the
sequence for lock-out time and then goes into lock- out.
For all types of errors, the status LEDs indicate the status information to the operator.
Fig. 6 to Fig. 13 show the sequence of DBC2000 in case of some error. And Table.5 shows the status of LEDs for each
error.
L
O
A
D
I
N
D
I
C
A
T
I
O
N
PO WER SW ON
CO NTRO LL ER ON
BL OWER
IG NITI ON TR
PI LOT VA LVE
MA IN V AL VE
AL ARM
HI GH
DA MPER
LO W
AI R FL OW SW
FL AME SI GNAL
PO WER
PR E/PO ST -PUR GE
IG NITI ON TRI AL
PI LOT ON LY
M- TRI/ M- STA
RU N
FL AME
AL ARM
Fig. 6: Failure to ignite the pilot
Lo ck ou t
Po st -P urge
Ig niti on Tri al
20 S EC
ENS7003R0 KO06 2010
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