The traditional Heating plus Air Conditioning plan consists of a furnace, a fan, plus an A/C system, plus you need more than three wires for the plan to work.
For current Heating plus Air Conditioning systems that use a smart temperature control, you need to link a C wire.
Thus, you will need to have many wires for your Heating plus Air Conditioning plan plus the temperature control to function. To access the wiring, turn off your Heating plus Air Conditioning plan to get to the control board to show which wires should go where you service them. Then open the Heating plus Air Conditioning units’ covering plus access the control board. The control board will have terminals labeled R, G, Y, W, plus C, with each of these terminals corresponding to wires routed to your temperature control. The official color codes for the wires linked from the furnace to the Thermostat are Yellow for cooling, Green for the fan, White wire for the heat, plus Red for power. There are instances where a green wire will be used for cooling, depending on the temperature control’s brand. The green wire will be the familiar wire for a multiple-wire temperature control, also called a C wire. If you attempt to install on your own without professional help, take note or take a photo of every wire plus where they are linked in the Heating plus Air Conditioning controlling board plus match them on the temperature control’s terminal… When you inrespectfully wire them, you may end up blowing a fuse, or your plan may not function respectfully. You should wire your Heating plus Air Conditioning plan respectfully to ensure it runs efficiently, then better yet, get an Heating plus Air Conditioning professional to wire your temperature control.