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If you have only heat, you can use Red for R, Green for G White for W, and Blue for C`. …

(C) Methods of Grounding. … to the equipment grounding conductor in accordance with 406.4(C) or 250.130(C). (2) Non–Grounding-Type Receptacles. …

If you short the R wire to the C wire, you've effectively created a very low resistance closed circuit across the secondary of the 24V transformer in the HVAC system. … Since 18 AWG wire is only rated to carry 14 amperes @90°C, the 40 amperes running through the wire could be enough to damage it. …

In this case, the Yellow wire is Common (C), Blue(low) is Run (R), and Blue(high) is Start (S). Once you figure out which wire is which, label them R, S, and C. … Connect one of the power wires to the Common (C) motor wire. Next, connect the unused capacitor wire, and the Run (R) motor wire to the unused power wire. …

Then at the air handler connect them as follows: Red to Rc Yellow to Y Green to G Blue to C If there's already a wire attached to the C terminal, don't worry. … Just attach the blue wire from your thermostat cable there as well. The other wire is likely from the condensing unit outside. …

If you're adding a fancy new thermostat, you'll need to connect the C terminal. The thermostat will then be powered by the transformer, using the R and C terminals. …

Once you've got that, you can use tables and voltage drop calculations to determine wire size. … You mention an A/C unit. You'll want to check the nameplate on the unit, and add the A/C load requirements to your total load. …

More than you've ever wanted to know about the C wire: Lets start by explaining what the C wire is, and why it's needed. … Then you'll have to wire the C wire from the cooling system, to the C terminal of the thermostat. …

I've highlighted the C wire in the wiring diagram. You'll have to bring a wire from the transformer in the heater, up to the thermostat location. … This may require pulling a whole new 3 wire cable. If there's an open terminal where the brown wire attaches to the transformer, you can connect the new C wire for the thermostat there. …

Just connect the R wire from the A/C to Rc, and run a C wire from the A/C to the C terminal on the Ecobee. … Connect a wire from the C terminal on the control box in the furnace, to the C terminal on the Ecobee. Assuming the transformer in the furnace is powered, that should get you up and running. …

If you connect the C terminal on the thermostat, to that C terminal on the furnace control board. That should power your new thermostat. …

Connect the yellow wire from the new thermostat cable, to the thin red wire from the A/C unit. … At the thermostat Connect the red wire to R Connect the green wire to G Connect the white wire to W Connect the yellow wire to Y Connect the blue wire to C …

That's a switching relay, and it does not expose the C terminal (see the PDF). You may be able to access the C terminal, but you'd have to disassemble the device. …

Yes, the terminal labeled C on the transformer is where you want to connect the C wire to the thermostat. … It might also be a good idea to put an appropriately sized fuse in line with the R wire. …

If the thermostat you choose requires a C wire, you'll likely want to supply the C from the A/C transformer. It's almost always easier to get the C wire from a forced air system, than from a boiler. … Also, some thermostats actually require that the C wire come from the cooling system. …