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For vent damper-equipped models, connect thermostat
to blue leads (see Figure 2.6).
NOTE: If any of original wire supplied with boiler
must be replaced, use similar wire of 105° C rating.
Otherwise, insulation may melt or degrade,
exposing bare wire.
NOTE: Boiler transformer must not be used to
power external accessories (i.e., zone valves,
relays, etc.) Otherwise, transformer will be
overloaded and burn out.
12
FIGURE 2.13: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS WITH STANDING PILOT &
MCDONNELL-MILLER #67 LOW WATER CUT-OFF
(EXCEPT GB250-8 & GB250-9, N.G.)
FIGURE 2.14: WIRING DIAGRAM & OPERATION
SEQUENCE FOR BOILERS EQUIPPED WITH
STANDING PILOT & MCDONNELL-MILLER #67 LOW
WATER CUT-OFF (GB250-8 & GB250-9, N.G.)