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

electricalthermostatthermostat-c-wire

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:

  1. 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.
  2. 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.

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Best Answer

Hast thou pulleth upon the wires at thine thermostat to looketh upon the point thine c wire might be clippethed at the jacket? Thou should.

Thou should not double up thine wire at the c terminal upon thine circuit board without praying thine luck is true, elste thou shall unwittingly risk fryingeth thine furnaceths brain. Do so without specific knowledge of its ability to accommodate such doubleth penetrant at thine peril tho it may be fine, I doth offer with humility and humble deference that thou mighdts turneth luck to surety with some calling of the blacksmith who manufactured this magical baseboard. May luck be at your side on your quest to fancier temperature adjustment.

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