ECR International Dunkirk DCB-75 Installation, Operation & Maintenance Manual page 52

FIGURE 8-8 Circulator Pump Connections
For more information please review the application
guide received with your boiler.
A field supplied pump relay is necessary for system pumps.
8 - ELECTRICAL CONNECTIONS
Thermostat or Endswitch
from zone valve or valves
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240013501 REV A [03/15/2022]