Smith Cast Iron Boilers GB250 SERIES - Manual (Page 14)

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FIGURE 2.15: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
STANDING PILOT, VENT DAMPER & MCDONNELL-
MILLER #67 LOW WATER CUT-OFF (FOR GB250-8 &
GB250-9, N.G.) FIGURE 2.16: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
INTERMITTENT PILOT, VENT DAMPER & 400
SERIES LWCO