Honeywell DBC2000 Series - OPERATIONAL SEQUENCE DIAGRAMS; Post-Purge Operation Sequence Diagram; No-Post-Purge Operation Sequence Diagram

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