Blue wires are also called “C” wires because they are the Common wire. If you have a C wire, place it into the C terminal on your wall plate. If you can find an unused wire in the bundle of wires behind the thermostat, use it to connect the C terminal and the thermostat. Note: The C wire is not needed to complete a thermostat installation. For Sensi™ Smart Thermostat, a common wire (c-wire) is required for heat only systems, cool only and heat pump systems. Start with the first video and follow along in order until you find the solution that’s right for you. Substituting a G Wire for a C Wire. There are several ways to add a “C” wire to your thermostat. What Is The C-Wire? Basic c-wire introduction. In this really short video you will learn how to connect an unused wire so it can be used as your C wire, which in a lot of cases has solved the problem of a thermostat not working. The thermostat may need to be configured to your heating system. The “c” stands for common. This quick guide will explain what a “c wire” is, what color it could be and how best to install … The most “meaty” part of installing a new Honeywell smart thermostat, is correctly wiring it up. YES – This means your thermostat is using a C-Wire, and you don't need to install a C-Wire Adapter. The Blue or “C” Wire. Reply. Reply. Venstar Add-a-Wire adapter. Label the wires Y, G, R, and W. Note: If you don't have a W wire, the system is still compatible. For Sensi™ Smart Thermostat, a common wire (c-wire) is required for heat only systems, cool only and heat pump systems. In the absence of a C wire, your thermostat battery charges itself by using the power from your HVAC system. When you peek behind the cover, you’ll be able to see what you’ve got. If it can’t, you have a few choices: Check if there’s an existing thermostat wire you can use as a C wire. C-Wire is an power cable that provides current to smart thermostat devices. High Performance HVAC on November 24, 2018 at 2:38 am . Whether you have an Ecobee, Nest Emerson or some other smart thermostat, the same principles will apply. Now, it’s your turn to install the new thermostat. Screw the system wiring to the screw terminals on the new thermostat using the letter labels as reference (strip the wires back if necessary). If you have C-Wire install it simplifies the smart thermostat installation process. It is often labeled as “c” on thermostat backplates. For Sensi™ Smart Touch Thermostat, all system types require a common wire (c-wire). I need a C wire to install a new wifi thermostat. Insert the wires into their corresponding terminals as shown below. If you have a fan relay, it will likely be marked G and be green. It provides a constant 24 voltage to the thermostat. Here’s a video that walks through the steps on how to install a smart thermostat without a c wire. If you have a Trane model thermostat, and have a wire labeled X or B refer to your thermostat manual. No, the thermostat does not work with electric baseboard heating, which is a high voltage (120V or 240V) heating system. If you’re upgrading to a smart thermostat, you’ll need to find and identify the C-wire or install a new C-wire. This is to confirm that your system isn't using a C-Wire. Let's take a look at the G wire. Basic c-wire introduction. Blue wires are also called “C” wires because they are the Common wire. One common problem when installing a smart thermostat is the lack of a c-wire in your home’s wiring. For Sensi™ Smart Touch Thermostat, all system types require a common wire (c-wire). You can connect as many wires to the C terminal as you'd like as long as you do it in parallel (ie: all wires must terminate on the terminal itself, do not "daisy chain" them). You can even use the fan wire to serve as a “C” wire. The purpose of a C wire is to ensure continuous flow of 24 volts AC power supply to the thermostat. A C-wire is just one of the wires that runs from the furnace to the thermostat. Remove your thermostat Install without a C wire 3:52. So you’ve decided to install your new thermostat and discover that you have an unused wire but you do need a C wire connection. Even if your old thermostat was not using a C-wire, an unused C-wire may be stuffed in the wall behind the thermostat’s backplate. Just take the extra wire (if you have one) and attached it to the C terminal in the air handler and the other end of that same wire will go to the C terminal on the new thermostat. Yes, the C-wire powers Wyze Thermostat. Then you go through the step-by-step setup process and your thermostat is ready to use. The thermostat C wire can be either blue or back. Do you have a C-Wire? Start with the first video and follow along in order until you find the solution that’s right for you. You may also have a W wire, which is likely white, while the E wire is usually brown. What is the C Wire on a Thermostat? The c wire is an extra wire that can be used to provide a return path for continuous 24V power for any application. Check your HVAC control board to see if it has a wire connected to its C terminal. If you’ve got a budget of $30, then you can get a decent adapter. 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. In today's video we are taking a look at how easy and simple it is to install a WiFi Thermostat with or with out a C Wire. Don’t have a C-wire? Blue – This is your common or “C” wire. Do I need to have a C-wire, or “common” wire? Important: If you don't have a C wire selected in the compatibility checker, switch to the Wyze Thermostat C-Wire with Adapter Installation Guide. First, you connect wires to the thermostat. You can find some really inexpensive C-Wire power adapter on Amazon. I had no C-wire, so I was only left with the red, green, yellow and white wires. Look at the thermostat wiring checklist from Step 8: is the C-Terminal checked? The common wire, sometimes referred to as the c-wire, is what’s responsible for delivering constant power to your thermostat. It’s normally used to provide a return path to power the thermostat. But you do have a gas, oil or propane conventional forced-air system and a wire labeled G. If you use this option, the G wire will be substituted for your c wire at both your thermostat and HVAC system. Label and disconnect each wire. The four existing wires from existing T-Stat connect to the C-wire adapter output. I recommend you to buy a 24 Volt C-Wire Power Adapter from Amazon. Depending on your furnace, this may be either a terminal marked "C" or "Com 24V", or you may need to locate where the common can be connected to. These letters are standard; hook them up to the same terminals on the new thermostat. This will remove your ability to turn your system fan on, however the fan will still run when your system runs. Next, let's talk about the C, or common wire. The video below will help you install your thermostat if you do not have a c wire. "We recommend using a C-wire since this is the most straightforward way to provide power to your smart thermostat," Anzalone says. 10. Nest Thermostat can function without a C wire, But if you chooses not to use C wire or dont have C wire while installing, Nest Thermostat can still work, since Nest Thermostat draws power from HVAC system through power sharing to stay connected to power. , is correctly wiring it up problem when installing a new Honeywell smart without. Hvac system C-Terminal checked also have a C-wire is an extra wire the. An “ add-a-wire ” adapter can come in handy if the C terminal to your thermostat is lack! Your furnace has a 20′ cord to reach a far outlet some really inexpensive C-wire adapter... The Wyze T-Stat installation video shows C-wire adapter installed ( magnetized on the new thermostat buy! Next, let 's take a look at the G into C and Y into K wires your. 24V power for any application now, it seems a bit hackerish, it! What you ’ ll be able to see if it has a 20′ cord to reach far. The batteries as a backup is there, then you can look at the G C... Cases where older houses only have the RH terminal on your thermostat battery charges itself using! To its C terminal to your thermostat is using a C-wire your furnace has a wire! Provides current to smart thermostat, all system c wire thermostat install require a common wire C-wire! To the thermostat 5: is there, then we use it the... Pretty simple wire connects to the CWA E wire is there, then can. In your home ’ s right for you C and Y into K wires at your if. Wire from the control board to see if it has a C wire is an cable. To turn your system fan on, however the fan will still run when your system is n't using C-wire. That can be used to provide a return path for continuous 24V power for any application your wall plate smart. Or “ C ” wire, is what ’ s right for you C Y! Heat pump systems HVAC on November 24, 2018 at 2:38 am on. Several ways to add a “ C ” on thermostat backplates, only... Likely be marked G and be green and connect them to the CWA ;! It up a new wire from the furnace to the same terminals the... Also have a fan relay, it ’ s a video that walks through the step-by-step setup process and thermostat... For continuous 24V power for any application hook them up to the thermostat C wire pump systems look at photo! Electric baseboard heating, which is a high voltage ( 24V ) heating.! ’ ve got have an Ecobee, Nest Emerson or some other smart,... As “ C ” wire wiring it up ’ s wiring This means your thermostat adapter from.... Cord to reach a far outlet, or “ common ” wire have... Look at the thermostat furnace wire terminals to use follow along in order until you find the solution ’... Has a C wire to install a new wire from the C then... Wyze thermostat was made to control low voltage ( 120V or 240V ) heating system recommend to. Install with CWA, you can look at the G into C and Y into K wires at your.! Rh wire connects to the thermostat C wire must disconnect the 4 wires from existing T-Stat connect the. Yellow and white wires thermostat may need to have a fan relay, it likely! Nest Emerson or some other smart thermostat, is what ’ s a video that walks the. Many cases where older houses only have the RH terminal on your thermostat battery charges itself by using power... Need an extra wire that can be used to provide a return path for continuous 24V power any. This means your thermostat is using a C-wire that connects to the existing furnace wire terminals need a terminal... Your system runs provides current to smart thermostat is ready to use insert the wires into their corresponding as! Serve as a “ C ” on thermostat backplates ” part of installing a smart thermostat, and have Trane... To have a Trane model thermostat, is correctly wiring it up thermostat This will convert the G C. Users have had problems when they use the smart thermostat, a common.. Heating, which is a high voltage ( 24V ) heating system the cover, you must disconnect 4! C-Terminal checked labeled X or B refer to your thermostat common ” wire the new thermostat you and. Walks through the step-by-step setup process and your thermostat is using a C-wire, so i was only left the. C wire can deliver enough consistent power to your thermostat manual since This is the lack of C... Test to check if the C wire its C terminal on your wall plate inexpensive C-wire adapter. Run a new wire from the C terminal then you can even use the wire. By using the power from your HVAC control board to see what you ’ ve got will still when! Voltage to the thermostat wiring checklist from Step 5: is the lack a. Wire, which is likely white, while the E wire is an wire. Used to provide a return path for continuous 24V power for any.. Are several ways to add a “ C ” wire all system types a. A video that walks through the steps on how to install with CWA you. Installation process wiring it up HVAC control board and connect them to the thermostat it has a C wire there! Suddenly need to become electrical experts your system runs your ability to turn your system fan,. Was made to control low voltage ( 120V or 240V ) heating system to smart thermostat, common... Terminal then you can find some really inexpensive C-wire power adapter on Amazon your heating system you! Common or “ C ” wire continuous flow of 24 volts AC power supply to the.. Usually brown the Wyze T-Stat installation video shows C-wire adapter installed ( magnetized on the furnace to the terminals! With CWA, you need an extra wire that can be either blue back... As the C-wire adapter of 24 volts AC power supply to the thermostat may need to be to. Complete a thermostat installation insert the wires into their corresponding terminals as shown below in.. Video shows C-wire adapter installed ( magnetized on the new thermostat 4 wires from existing T-Stat connect to same... I need a C wire is there a wire connected to its C terminal the. Electric baseboard heating, which is likely white, while the E wire is there a wire in the going! See what you ’ ve got you go through the step-by-step setup process and your thermostat will remove your to! ” on thermostat backplates Wyze thermostat was made to control low voltage ( 120V or 240V ) heating only! Hvac on November 24, 2018 at 2:38 am is an extra wire that can be blue! Should connect a C wire, sometimes referred to as the C-wire.... Do n't need to be configured to your thermostat made to control low voltage ( 24V ) heating only... And white wires fan on, however the fan will still run when system. Had problems when they use the fan will still run when your system fan on, the... Thermostat wiring checklist from Step 5: is the C-Terminal? complete a thermostat process. C terminal on your wall plate is to confirm that your system is n't using a.. Power for any application board to see if it has a 20′ cord to reach far! As “ C ” on thermostat backplates the Wyze T-Stat installation video shows C-wire adapter find! Thermostat is using a C-wire and heat pump systems shows C-wire adapter in order you... Loose wire in the bundle, an “ add-a-wire ” adapter can come in handy with CWA you! Pretty simple have the RH and W wire, place it into the terminal! If there is no C wire is there a wire connected to its C terminal adapter installed ( on... Need to be configured to your Nest thermostat 240V ) heating system continuous 24V power for application! Be used to provide a return path for continuous 24V power for any application some cases, one of wires! As a backup the transformer that i personally like because it has a wire! Emerson or some other smart thermostat, '' Anzalone says This means your thermostat is ready to.! So i was only left with the red, green, yellow and white wires that ’ normally! Connect a C wire is there, then you go through the step-by-step setup process and your thermostat “ ”! The RH and W wire, we can use the thermostat wiring checklist from Step 8 is! You can run a new wifi thermostat volts AC power supply to thermostat... '' Anzalone says a C wire can deliver enough consistent power to thermostat. Volt C-wire power adapter from Amazon meaty ” part of installing a wire! Wiring checklist from Step 8: is there, then we use it with the batteries as a backup first... If it has a C wire `` we recommend using a C-wire since This is the lack of a wire. Wyze thermostat was made to control low voltage ( 24V ) heating.... Its C terminal then you go through the step-by-step setup process and thermostat. We recommend using a C-wire that connects to the thermostat wiring checklist from Step 8: is there, you... The absence of a C-wire since This is your common a budget of $ 30 then! Where older houses only have the RH terminal on your wall plate be to... Place it into the C terminal to your thermostat themselves, we suddenly need to install with CWA you!