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I tried to self install the thermostat, but I cannot locate the control board for this furnace, to connect the C-wire.
I followed EcoBee's instructions, which pointed me to use as C-wire the unused wire I had there, which was disconnected from the old thermostat. Theoretically next step is to connect this "C-wire" to C on the control board, but I cannot find the board anywhere. I am not sure there is a control board!
Link to pictures: http://s649.photobucket.com/user/lukadp/library/Furnace