SSB 6720892984 (2019/02) US
Service reminder | 73
Appendix L - Safety timing
Stanby Pre purge 0 Pre purge 1 Pre ignit Ignit Flam Proving
Safety period
State
Demand
Fan
Gas valve
Spark
Flame
Burn Post burn Post purge 0 Post purge 1
The following table shows the states of the burner ignition cycle:
Control state Actions Setting
Pre purge 0
Fan is not running,
Initialize pre-purge 1
0 sec
Pre purge 1 Fan starts at ignition speed Parameter E2_PRE_PURGE_TIME: 20 sec
Pre ignit
Fan stays at ignition speed
Igniter is started
2 sec
Safety period Ignit State + Flame Proving 5 sec
Ignit
Fan stays at ignition speed
The gas valve is opened
Igniter stays on
3 sec
Flame proving
Fan stays at ignition speed
The gas valve stays opened
The igniter is stopped
2 sec
Burn
The fan is modulating
The gas valve stays opened
Post Burn
The fan is set at ignition speed
The gas valve is closed
Initialize post-purge 0
0 sec
Post purge 0
The fan is set at ignition speed
The gas valve is closed
Wait until ame is gone, max 10 sec. Timeout
triggers FLAME_OUT_TOO_LATE lock error (20)
Post purge 1 Fan stays at ignition speed Parameter E2_POST_PURGE_TIME: 10 sec
Standby
Fan is not running,
The gas valve is closed
Pump post run may be active
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