05-12-2008, 03:54 PM
Just installed a Carrier comfort series split system in a house with hot water heat. The tstat is currently powered by a 24v. transformer that is part of the HW system. The Carrier fan coil has an integral 24 v transformer. Should I use a relay to isolate the HW 24v. tsat signal from the Carrier 24v. transformer, or is there a better way?