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Join Date: Jan 2012
Posts: 12
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01-22-12, 05:29 PM   #3 (permalink)  
Hi hvactechfw. It does have a built-in battery, but it needs to get recharged off the C wire, so I will need the 24v transformer. Why do I need a "spst relay (24VAC coil)"? Will it not work if I just wire the 24v transformer wires to C and Rh?

Thanks for your help!