Where does C wire go on a C unit?

If your system has a C-wire, it might be in use or just tucked away behind your current thermostat. If your system doesn’t have a C-wire, you’ll need to run a new cable from your furnace to your thermostat to install most of the modern smart thermostat models.

Does my a C have C wire?





Quote from the video:
Quote from Youtube video: And it's coiled up in the wall like that it is most likely not connected at your furnace. End as well. So you'll have to go into the furnace or the heat exchanger compartment.

What if there is no C wire for thermostat?

You most likely have a line voltage system and none of the popular smart thermostats on the market are available to you as-is. (There is some hope with an adapter, but don’t get too excited yet.) This wiring indicates a line voltage system, and you’ll need an adapter or a smart thermostat designed for line voltage.

Does C wire connect to air handler?

Older wires will have only 2 or 4 strands but the 5 strand will provide that extra wire known as the c wire. When connected inside the air handler, it provides that needed 24vac power for the smart thermostat.

Can I use a jumper for the C wire on a thermostat?

There are a couple of options to using a smart thermostat without a C-wire. Assuming that you have four wires available at the thermostat (R, G, Y, and W), the simplest choice is to reappropriate the system’s fan wire (G-wire) to be used as a C-wire, and use a jumper wire to tie the Y and G terminals together.

Do older thermostats have a C wire?





As previously mentioned, older thermostats don’t necessarily need a C-wire to function. Yet, an unused C-wire may still be included in the bundle of thermostat wires tucked away in the wall. To check, simply turn off your system’s power and open the front plate of the thermostat to see the current wire connections.

What color is the C wire?

Blue wires

Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.

Is RC wire same as C wire?

The C and Rc wires are not the same. To install this thermostat you should follow the exact same wiring of the previous thermostat.

Where is the C wire on an old furnace?



Quote from the video:
Quote from Youtube video: Here here's the whole furnace unit. And. So what we're gonna do is to find our C wire since we know we have one present always need to find where it comes to. And see if it's hooked up or not and we'

Where does the C wire get power from?

A C-wire, or a common wire, runs from your low voltage heating system (24v) and carries continuous power to your thermostat. In today’s electric market, most newer heating and cooling systems have C-wires, which guarantees compatibility for the installation of all smart thermostats.

Can I use G wire for C wire?

Option #3: Use a G-Wire as a C-Wire



If there is no hidden C-wire, you can use a G-wire instead. However, you will not be able to use your fan independently when the heating or cooling isn’t running. Also, many HVAC systems are incompatible with this solution, including: HVAC systems using electric heat.

Does C wire have voltage?



The C wire, a.k.a. the “common wire”, allows a constant flow of 24 VAC (volts AC) power to a smart thermostat. However, the C wire doesn’t provide the actual source of power to the thermostat. The wires that provide the source of power are the R wires (or hot wires).

How do I know which wire is C wire?

Quote from the video:
Quote from Youtube video: Begin by putting one probe whichever probe you want on the rh wire and test every other wire with the other probe. One of the wires will show up is 24 volts and that is your c wire.

How do you check C wire with a multimeter thermostat?

Quote from the video:
Quote from Youtube video: Come over to the common wire. And yes i am getting current to it. And this one is looped over here so i know this is going to be the same circuit as this one if i go over to the yellow.

How do I test if C-wire is live?

Easiest way to check is pull any batteries out of the old thermostat and look for a wire (normally blue) is connected to the C spot. If the old unit supports being powered by the common wire, then the unit will turn on without batteries.

Can you get shocked by thermostat wires?



Virtually all room thermostats operate on low voltage that carries little risk of harmful electric shock. However, it is always wise to shut off power to a thermostat at the service panel before examining or working on it.

What is the orange wire on a thermostat?

The Orange Wire



The orange thermostat wire links to your heat pump, if you have one. It terminates in your outdoor condenser for reversing valve operation from hot to cold. The orange wire connects to terminal O on your thermostat. The orange wire only applies to homeowners with an air-source heat pump.

How do you wire an old thermostat?

Quote from the video:
Quote from Youtube video: So I would put the red wire. And the R. Into either R or RC. It doesn't really matter which one I put it into because there's a jumper between R and RC. So I'll just go ahead and put it into R.

What color is the orange wire on a thermostat?

Standard Thermostat Wiring Labels, Wire Colors and Their Functions –

Labels Colors Functions
O Orange Reverse Valve For Cooling
B Blue Reverse Valve For Heating
G Green Indoor Fan/Air Handler
Y1 Yellow Cooling