Where does the C wire connect to a transformer?

Quote from the video:
Quote from Youtube video: Run actual thermostat wire in the all and connect. It to the existing thermostat wire if you've got an extra wire or if you want to fish some new ones in the wall. Not a big deal there.

What is the C terminal on a Nest Thermostat?

But sometimes, you may need to connect a common wire (C wire) or power accessory, like the Nest Power Connector, to make your system compatible. Unlike other wires connected to your thermostat, a C wire doesn’t control heating or cooling functions. It only provides constant power to your thermostat.

Where does C wire go on Nest Thermostat?

Quote from the video:
Quote from Youtube video: And we're going to use it as AC wire the common wire and what a common wire does is it allows a return current path from the power the are see through the thermostat. And back through the C wire.

Where does C wire go on furnace transformer?

I think you got the C (blue) wire connection right, it is really just the negative side of the of the transformer. If you have HVAC (forced air) furnace, usually all the terminals for the thermostat are on a control board and pretty well labeled for where to connect all the colors of leads.

How do you wire an a C wire to a transformer?

Quote from the video:
Quote from Youtube video: It doesn't matter which one is common which one is neutral. As long as you hook them to the 24 volt circuit. See I'm holding them wires two together.

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).

Is C wire required for Nest?

The short answer is that you don’t need a common wire to install your Nest thermostat. You can just as well use a C-adapter and your device will function just as well.

Do I use RH or RC on Nest thermostat?

The Nest Thermostat E only has an R connector, which is typically where an R wire would go. If you have separate heating and air conditioning systems, you might have separate Rh and Rc wires that come out of the wall and are connected to your system.

Can I use Nest without C wire?

You can install a Nest Thermostat without a C-wire by using a C-wire adapter, that mimics a traditional C-Wire without you having to wire it. If you are not a handyman, it saves a lot of money that you would otherwise have to spend on a professional installer too.

Can I jump R to C wire?

C is a common neutral wire. You can’t jump it from Rh as that is a 24v wire. You need a third wire, C, to return to the unit and hook to the common side of the transformer. For ease of thought, think of R as “hot” and C as “ground”.

What is 24V hum terminal?

The HUM terminal is a 24 VAC output, energized when the blower is operating during a call for heat. Connect an accessory 24 VAC, 0.5 amp. maximum humidifier (if used) to the ¼-in. male quick-connect HUM terminal and COM-24V screw terminal on the control board thermostat strip.

Is com 24V the same as C wire?

The c wire is an extra wire that can be used to provide a return path for continuous 24V power for any application. It’s normally used to provide a return path to power the thermostat. The “c” stands for common. It is often labeled as “c” on thermostat backplates.

How do you connect C wire to HVAC?

Quote from the video:
Quote from Youtube video: For the common wire or. The ground path for the 24 volts to return to and so that is actually where we're going to go ahead and hook our C wire into underneath this wire nut.

Is RC and C wire the same?

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

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.

How do I know which wire is the C wire?

Quote from the video:
Quote from Youtube video: So it's fairly simple to tell if you have a/c wire or not firstly the purpose of a/c wire is basically for the newer thermostats. As either has a backlit display or has Wi-Fi functionality.

Is the C wire Brown?

The C, or common wire, provides smart thermostats with continual power. It’s usually blue, but it may also be black, brown or purple. The O or orange wire connects to your heat pump (if applicable).

How do I know 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 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.

How much voltage should c wire have?


A C-wire, or a common wire, runs from your low voltage heating system (24v) and carries continuous power to your thermostat.