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I need some advice for my Ecobee 3 installation. There’s no C wire at the thermostat; so I know I have to use the Power Extender Kit. But back at my HVAC control board, there’s already a C wire that runs somewhere else. (I can’t see where it goes…maybe to my humidifier?) My plan is to remove that C wire (and the other four wires) from my HVAC control board, and connect all five wires from the PEK to my HVAC control board according to the standard directions. Can I also the connect the original C wire to the PEK to make sure there’s still power supplied to whatever it’s supplied to now? In other words, can I have two C wires connected to the C terminal on the PEK…one for the kit to supply power to the Ecobee, and the other to go wherever it goes now? Thanks!