I know this question has been asked multiple times and I'm going to try some of the methods I have read in other threads but wanted to ask this question since I didn't see anyone else's wired the way I have mine wired.
Systems: AC and furnace
Old digital thermostat -> Ecobee 3
Old thermostat wiring:
First 2 wire:
- Red -> Rh (jumper to Rc)
- White -> W
Second 2 wire:
- Red -> G
- White -> Y
These wires run down into the basement to wire nuts where they split into wires leading to the AC unit and to the furnace. The wires leading to the furnace and AC are different colors so I have to undo the spaghetti to determine which colors are connected to the thermostat wiring.
Inside the furnace the wiring is:
- Green -> G
- Blue - > C (Com 24v)
- White -> W
- Yellow -> Y
- Black -> R
What's strange is that I can follow that black wire out to the condensate line attached to the furnace and it's connected to an EZ Trap.
The thermostat wiring is not connected to R at all. I thought the EZ Trap would be connected to C if anything and not sure how the thermostat is working properly if not connected to R.
Is this wiring normal?
I was thinking of connecting my Ecobee with an external transformer. So connecting the wires from the old thermostat as is and connecting the wires from the transformer to C and to Rc.
Is this correct and the proper way to wire my system given my wiring at the furnace?
Here is the image of the wires.
I have to cut the tie holding the wires together and trace all the wiring back to see exactly what is connected to what. I do know the blue common wire is connected to a red and white wire.
Ok I traced back all the wires in that spaghetti mess and have found where they all go.
Thermostat -> Air Handler -> AC
White (W) -> White (W)
Red (Rh) -> Red (R)...goes to wire nut with black wire. Black wire leads to condensate pump and ez trap and R on the air handler
White (Y) -> Yellow (Y) -> White
Red (G) -> Green (G)
...-> Blue (C or Common) -> Red (also goes to white humidifier wire)
...-> Brown (HUM) to red humidifier wire
I hope that explains it all. Is it normal for the C wire to go to the AC? So how would I wire up the Ecobee to make it work?