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Figure 22: Wiring Diagram, Water without Tankless Heater for Beckett Burners
BOILER SEQUENCE OF OPERATION
A call for heat by the thermostat energizes the L8148A control which in turn energizes the primary control to turn on
the burner. The burner will operate in the following sequence: Prepurge for the fi rst 10 seconds; fi re until the thermo-
stat is satisfi ed or the limit setting on the high limit is reached; post-purge for the last 10 seconds. The circulator will
operate as long as the thermostat is calling for heat. If the thermostat is not satisfi ed and the high limit is reached,
the circulator will continue to operate, and the burner will stop until the high limit is closed by a drop in boiler water
temperature.
On burner start, if the cad cell does not see fl ame within approximately 15 seconds, primary control will shut burner
down and enter into a recycle mode, after 60 seconds burner will restart and repeat trial for ignition. If after three
(3) trials for ignition, fl ame is not detected, control will enter into restricted mode and must be reset manually before
burner can be restarted.