My dog has chewed through my wires on my unit that turn on my fan at the ac unit. This is not the first time. Its always been an easy fix until now. He actuall pulled the wire from the unit and I dont know exactly what wires im supposed to connect. The wires coming from the house are red and white. But when I take the plate cover off the unit... the only wires exposed are blue and yellow. Are the the correct wires? And what connects to what.????
Wire colors with HVAC wiring are non-standardized, so the colors themselves don't help much.
Your furance/air handler should have a control board with terminals labelled R, W, Y, G and C. There should be an existing wire that connects to all of these (though maybe not C) that goes to your thermostat.
If anything is different in your setup, please update your question with a picture explaining, don't just wire it as I described or you may damage something.
The A/C unit wires connects to Y and C (usually white on C, but it doesn't really matter).
- R = power (24VAC)
- Y = cooling
- W = heating
- G = fan
- C = common power (24VAC with R)
Since this happens a lot, I'd also highly recommend putting some mechanical protection on this wire. Since it's already disconnected, it should be easy to fish through now.
Some flexible ENT tubing might be the easiest option:
1/2" rigid PVC conduit could also work, you can get elbows and other connectors.
All of this should be available at your local electrical / big-box hardware store.
Your dealing with low voltage AC so you don't have to be concerned with getting the + and - backwards. Assuming the yellow and blue wires connect to the coil on the contactor, you can safely connect the two wires from the house to the two wires in the outdoor unit. Prior to doing any work with the wires, verify you have 1) the power off to the furnace/air handler and 2) the power off to the outdoor unit. #1 will keep you from potentially having to replace a blown low voltage transformer and #2 will help to keep you from killing yourself while working in the outdoor unit. The included image is representative of what I believe you have.
The + is yellow, and the- is blue in your case (technically common, or C). The dog could have blown the fuse. There is a 3amp fuse on the furnace control board that protects the low voltage side. If you don't get anything to come one, check that fuse.