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I have Trane HUMD300. It is my understanding I can either connect the humidifier to the Ecobee3 by either using 2 wires or 1 wire.
For the 2 wires I will have to external power my Humidifier by using a little 24v transformer and then using ACC+ and ACC- as follow
transformer --> ACC+
transformer ---> Humidifier solenoid (one end)
Humidifier solenoid ---> ACC-
For 1 wire it will be as follow:
Humidifier solenoid ---> ACC+
Humidifier solenoid ---> Furnace Common (C)
Any advantages of one setup over the other?