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Old 2015-11-03, 11:28 AM
royc royc is offline
Regular User
Join Date: Dec 2013
Location: ON/Ottawa
Posts: 70
Default Help in identifying proper C wire connection

Hello all,

I would appreciate some help in identifying the proper connection of a C wire to my HVAC. I am attaching a picture of the HVAC board. As you can see, there is a blue unattached wire (sticking up like an antenna) which I assume can be used for the C connection. On the board, There are six terminals which I can identify: W, Y, G, Rc, Y, C. The last two (Y, C) are grouped as "AC Relay". As you can see from the image, The C terminal already has 3 wires attached to it. Can I connect the blue wire to this also, and connect the other end to my wifi thermostat? I have attached a picture of my thermostat wiring also. I cant see the blue wire yet, I am assuming it's tucked behind the wall plate. I would really appreciate any advice. Thanks.
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