Ecobee 3 lite Installation -- Confusion about C wire (on furnace but not at thermostat)

Question

I am about to install the Ecobee 3 lite thermostat. On the thermostat end, there is no C wire - just the typical 4 wires - R,Y,W,...
On the furnace end though, there is white C wire too, which I do not know where it leads to (definitely not coming to thermostat).
Given the situation, following are questions I am looking answers for:

Can I simply remove the existing C wire and replace with the C wire from the PEK kit from Ecobee? Wondering what else may break in the house.
Can I simply keep the existing C wire as is, and add the C wire from the PEK kit in addition, at the same terminal?

Any info or any tips that can help me out in this situation are highly welcome.

ThreePhaseEel · Answer

You can connect two wires to this terminal

You can indeed connect the C wire from the PEK to this terminal in addition to the air conditioner's C wire.  If you look closely at your Y terminal, in fact, you will see it is already double-tapped with the Y wire from your thermostat and the Y wire to your air conditioner.

Ecobee 3 lite Installation -- Confusion about C wire (on furnace but not at thermostat)

One Answer

You can connect two wires to this terminal

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