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I had this unit put in about 3 years ago and have had so many issues with thermostats. Can someone help me identify where to place the c wire? It is available behind thermostat but not plugged in. Thank you so much

UPDATE: The pictures I posted originally showed C hooked up, but I came to find out that was actually Y, and I moved it to the correct terminal. I now need to know what transformer to connect the back of C to, and do I need to add the wire or should it be somewhere in front of me for me to simply plug in? Thank you for all your help enter image description here

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Raymond Rivas
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  • find the 24 volt transformer, the C wire is on it – asinine Jun 15 '23 at 23:26
  • Would you consider helping me for compensation? I want to get this done and I know it is simpler than what it looks like but my brain just won’t understand any of the diagrams I’m looking at ‍♂️ – Raymond Rivas Jun 17 '23 at 01:54

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Your thermostat cable has a yellow wire connected to the C terminal of the system. It also has a blue wire (normally used for C) not connected to the system.

I emphasize cable because we don't know what the yellow (and blue, and all the other) wires are connected to at the other end at the thermostat.

It does look like the C terminal on your system is connected by a blue wire to the common side of the transformer ... I can't be sure from the jumble of wires but I think so. So the normal way to do it would be the blue wire connects that to the C terminal on your thermostat.

There are lots of articles telling you what's normal. You should probably just follow one of them methodicaly. Your system, unlike many, seems to have all the necessary terminals and your thermostat cable has all the necessary wires.

jay613
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  • So just connect the blue wire with the yellow wire already in c? – Raymond Rivas Jun 16 '23 at 00:08
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    No. Connect each colored wire to the appropriate terminal*at both ends* according to the manuals or a good online tutorial. – jay613 Jun 16 '23 at 00:52
  • Got it. Was hoping the answer was simpler than you telling me to research, as I have no clue what is what but r&r is simple.. thank you for your response – Raymond Rivas Jun 16 '23 at 01:25
  • I am willing to pay for assistance in figuring out these wires. Via Zelle or PayPal to a verified member of this online community, thank you – Raymond Rivas Jun 17 '23 at 00:27
  • Okay so never mind on the C and Y mixup, I had to undo it. So I guess my system just doesn’t have the Y connected. I’m so lost – Raymond Rivas Jun 17 '23 at 05:05
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For time been ignore the electric schematics.

On you pic 1 and 2 is the 24 Volt transformer in top right corner. It shall have 4 wires. Two on one side and two on the other side. 2 wires are input (thus 120 Volt), and two wires are output, thus 24 volt. Turn off power to the AC and do not touch anything.

There is a bar with letters and screws. From left is R which is the 24 Volt from Transformer to the thermostat, then there is C which is the common wire, Then there is G which is for the fan and so on.

Your C tab has a yellow wire that goes to the thermostat. Find it at the thermostat and connect it to the C-tab on thermostat.

Remove the thermostat and inspect how many wires are in that cable.

tstat

asinine
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  • Okay, so the C wire was actually the Y. I made the switch. So the big mistery for me now is the C wire - what transformer to connect it to and do I need to add the wire or is it already there? Uploading pics so you see what I mean. Thank you for all your help – Raymond Rivas Jun 17 '23 at 03:52
  • Also, thermostat does have 5 wires. The Blue is tucked away waiting for me to use (C wire) – Raymond Rivas Jun 17 '23 at 03:58