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9
STEP 6: WIRING BOILER
All electrical and control wiring must be installed in accor-
dance with the codes listed in Section 1 of this manual. Fol-
low the wiring diagram for your particular installation as
shown in Figures 2.8, 2.9, 2.10, and 2.11.
For vent damper-equipped models, connect thermostat
to blue leads (see Figures 2.4 & 2.4A).
NOTE: If any of original wire supplied with boiler must
be replaced, use similar wire of 105° C rating. Other-
wise, 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.) Oth-
erwise, transformer will be overloaded and burn out.
FIGURE 2.8: Wiring Diagram & Operation Sequence for
Boilers Equipped with Intermittent Pilot, Vent Damper
and M & M #67 Low Water Cut-Off
WARNING: Turn off electrical power supply before
servicing. Contact with live electric components can
cause electric shock or death.
FIGURE 2.9: Wiring Diagram & Operation Sequence for
Boilers Equipped with Standing Pilot, Vent Damper and
M & M #67 Low Water Cut-Off