I have a Carrier outside unit (I think 2.5 ton) 38EC060300. It's old from early 1980s I think. I has very screwy wiring compared to standard if there is such a thing. At the thermostat there's a G, W, R, Y but at the system board (furnace)there's only a W, R and C connected and none of those go to the outside unit. There's also a splice down in the basement where the two 24 volt leads come in from the Carrier and I'm pretty sure only 1 was connected to the yellow wire but now I'm not sure. It came loose and all the thermostat leads are spliced there so it's hard to tell what the Carrier 24v lead was connected to but yellow makes the most sense. I also took the top off the Carrier and took pictures. What they show is one 24volt wire connects to a small AMF Potter & Brumsfeld circuit board and the other 24volt wire goes accross the unit and splices with a yellow wire then goes thru a hole in the ring down into the unit and attaches with another wire to what looks like a rubber insulator then in to one of the compressor pipes (I may be wrong but that's what it looks like). So I'm at a complete loss as to how the 24 volt wire(s) connect to the thermostat and I'm pretty sure only 1 was connected. Does anyone have a clue what this setup is and how I might run the wire(s)?? It looks almost like 1 leg of the 24 volt was hard-wired to the Carrier so only 1 lead from the thermostat would turn it on. I don't think color is important here but the color of the lead the went down in the Carrier and attached to the pipe was RED and the one that attached to the circuit board was WHITE.
source https://hvac-talk.com/vbb/threads/2239000-Old-Carrier-38EC060-Can-t-figure-out-wiring-for-24-volt-leads-Only-1-seems-needed?goto=newpost
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