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Common for new WIFI Thermostat

Thermostatic Controls - DoItYourself.com Community Forums - www.doityourself.com
Currently swapping two thermostats for Honeywell WIFI 9000's. Current house has two hydro-air units. T-stats get 24v from transformers within the AHU's. Currently, T-stat wires are RH, Jumper from RH to RC, W, Y, & G. New t-stat's require common. I take it I have to run a new wire from common side of transformer to the C terminal on the new t-stat?


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