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15
IV. Electrical
1. Install electric wiring in accordance with National
Electrical Code or the Canadian Electrical Code
and local regulations. See Figure 11 for the wiring
diagram and the boiler's Installation manual.
Figure 11: Priority Wiring Diagram - Multizone Space Heating with Zone Valves
or Single Zone Space Heating
2. The Alliance™ models contain an aquastat
assembly and will require an installer supplied
double pole, single throw (DPST) relay with a
normally open (NO) contact, a normally closed
(NC) contact, and a 120 volt coil for priority
domestic water. A Honeywell R4222D1013 is an
appropriate relay. Refer to Figure 11. For non-
priority, a SPST relay with one NO contact is
sufficient. For non-priority and space heating with
zone circulators, treat the water heater as an
additional zone.