Burnham K50 manual Sequence of Operation, Schematic Wiring Diagram EI Control System V88 GAS Train

SEQUENCE OF OPERATION

When operating control closes, the electric spark and pilot valve are automatically energized. The sensing probe proves the presence of the pilot flame. Internal switch action de-energizes the spark and energizes the main gas valves starting main burner operation. When the operating control is satisfied the pilot gas valve and the main gas valves are de-energized stopping the burner operation.

In the event of excessive steam pressure (steam boiler) or excessive boiler water temperature (water boiler), the high limit control will de-energize the pilot gas valve and the main gas valves stopping burner operation.

The low water cut-off will also stop burner operation if the water level in the boiler should drop below the lowest safe level.

Fig. 43

SCHEMATIC WIRING DIAGRAM - EI CONTROL SYSTEM (V88 GAS TRAIN)

U.S.A. 5010B THRU 5014B

CANADA 5006B THRU 5014B

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