Originally Posted by seand1109
So I will check out the cable end at the AC Coil... Curious, where is the other end of the cable... Since there are two units operating off this one thermostat, there has to be a box they connect to to "mix the signal to the one thermostat? Any idea where it is? Is this the same as a telephone cable which I have a few long extensions left from the bygone era of land lines to use to possibly replace it?
The cables are not telephone cables. The difference with communication cables is that one end is upside down.
Typical cable routing is that one cable runs from the thermostat to one AC control board. The board has two connection ports for cables. A second cable is run from the first AC to the second AC, daisy chain style.