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Attachment of a "C" wire from a WiFI thermostat

teablender Member Posts: 11
I have an Energy Kinetics System 2000 Boiler Model EK1. I am replacing an old two wire thermostat with a new programmable WiFi capable one (Honeywell RTH6500) and need to know where to connect the "C" wire to the 24 VAC common on the Energy Manager board. My system supports two heat zones and a domestic hot water zone.