Burnham V8 Series Bedienungsanleitung PDF herunterladen (Seite 51)

Figure 21: Wiring Diagram, Steam, McDonnell & Miller 67 Float LWCO for Beckett Burners

BOILER SEQUENCE OF OPERATION WITH FLOAT LWCO

When the thermostat calls for heat, it energizes the cad cell primary control, bringing on the burner. The burner will

operate in the following sequence: Prepurge for the ﬁ rst 10 seconds; ﬁ re until the thermostat is satisﬁ ed or the limit

setting on the high limit is reached; post-purge for the last 10 seconds. When the high limit control restores the circuit

on a drop in pressure, the burner will start if the thermostat is still calling for heat. The low water cut-off will shut down

the burner if the water level in the boiler drops too low. The control resets and restarts the burner with a call for heat a

few seconds after the water is returned to its normal level.

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.

When there is no demand for heat, the operating control will maintain the boiler water temperature at the selected set-

ting for proper operation of the domestic water heater, if equipped with optional tankless heater.

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Burnham V8 Series Bedienungsanleitung Seite 51