Honeywell DBC2000 Series Product Handbook page 13

Fig. 9: When false flame is generated during pre-purge
Fig. 10: When air flow switch goes OFF during pre-purge, and continues after the Lockout timing
BLOWER
IGNITION TR
L
PILOT VALVE
O
A
D
MAIN VALVE
ALARM
HIGH
DAMPER
LOW
Pre-Purge
AIR FLOW SW
FLAME SIGNAL
POWER
I
PRE/POST-PURGE
N
D
IGNITION TRIAL
I
C
PILOT ONLY
A
M-TRI/M-STA
T
I
RUN
O
N
FLAME
ALARM
BLOWER
IGNITION TR
L
PILOT VALVE
O
A
D
MAIN VALVE
ALARM
HIGH
DAMPER
LOW
Pre-Purge
AIR FLOW SW
FLAME SIGNAL
POWER
I
PRE/POST-PURGE
N
D
IGNITION TRIAL
I
C
PILOT ONLY
A
M-TRI/M-STA
T
I
RUN
O
N
FLAME
ALARM
Lockout
Post-Purge
20 SEC
Error Confirmation
Lockout
Lockout Timing
Error Confirmation
ENS7003R0 KO06 2010