![](/images/new-backgrounds/1053563/5356399x1.webp)
SEQUENCE OF OPERATION
When operating control closes, the electric spark and pilot valve on each side are automatically energized. The sensing probe on each of the pilots proves the presence of the pilot flame. Internal switch action in each ignition module
In the event of excessive steam pressure (steam boiler) or excessive water temperature (water boiler) the high limit control will
The low water
Should one of the pilot flames fail to ignite or become extinguished, the main gas valves controlled by that particular pilot would close stopping burner operation on the burners supplied by that gas train. Operation of the burners supplied by the second gas train would be unaffected.
Fig. 45
LADDER WIRING DIAGRAM - 15 THRU 26 SECT. BOILERS
EI CONTROL SYSTEM
50