If you have a C wire, place it into the C terminal on your wall plate. Thermostat Installation & Wiring Diagrams; Installing your ecobee thermostat with the Power Extender Kit (no C wire) If you’re lacking a C wire and have at least four wires at your thermostat to work with (refer to this article if you only have two wires), you’ll want to install the Power Extender Kit (PEK). Whether you have an Ecobee, Nest Emerson or some other smart thermostat, the same principles will apply. Yes, the C-wire powers Wyze Thermostat. Basic c-wire introduction. 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. Reply. Start with the first video and follow along in order until you find the solution that’s right for you. The purpose of a C wire is to ensure continuous flow of 24 volts AC power supply to the thermostat. In the absence of a C wire, your thermostat battery charges itself by using the power from your HVAC system. 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. Remove your thermostat Install without a C wire 3:52. There are several ways to add a “C” wire to your thermostat. Read the installation manual of the new thermostat you buy and wire the device accordingly. The Venstar Add-a-Wire is an inexpensive adapter that turns a four-wire system into a five-wire system.. One more alternative: get a smart thermostat that’s designed to work with systems lacking a C-wire.Check out the ecobee line of thermostats – all ecobees ship with an adapter for C-wireless systems. 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. Look at the thermostat wiring checklist from Step 8: is the C-Terminal checked? Wires Terminals THERMOSTAT This will convert the G into C and Y into K wires at your thermostat. Here’s a video that walks through the steps on how to install a smart thermostat without a c wire. 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. The “c” stands for common. The Y and Y2 wires are most likely yellow ones. 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. Let's take a look at the G wire. 10. Note: The C wire is not needed to complete a thermostat installation. Don’t have a C-wire? No, the thermostat does not work with electric baseboard heating, which is a high voltage (120V or 240V) heating system. The Rh wire connects to the RH terminal on your thermostat. The thermostat may need to be configured to your heating system. High Performance HVAC on November 24, 2018 at 2:38 am . Blue – This is your common or “C” wire. The adapter input has 5 wires including a C-wire that connects to the existing furnace wire terminals. As more consumers install the device themselves, we suddenly need to become electrical experts. Next, let's talk about the C, or common wire. The c wire is an extra wire that can be used to provide a return path for continuous 24V power for any application. Basic c-wire introduction. Page 8 Connect wires to the C-Wire Adapter Firmly depress the terminal tabs and insert the labeled wires into the “Thermostat” side of your C-Wire Adapter. Install the New Thermostat. Alternatively, you can look at the photo from Step 5: is there a wire in the C-Terminal?. The four existing wires from existing T-Stat connect to the C-wire adapter output. Do I need to have a C-wire, or “common” wire? The video below will help you install your thermostat if you do not have a c wire. Blue wires are also called “C” wires because they are the Common wire. 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. This is to confirm that your system isn't using a C-Wire. You may also have up to two black wires as well but these are used for various heating systems in the North or for outdoor purposes, so for most of you these won’t need any attention. 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. These letters are standard; hook them up to the same terminals on the new thermostat. C-Wire is an power cable that provides current to smart thermostat devices. There are many cases where older houses only have the RH and W wire. If your furnace has a C terminal then you can run a new wire from the C terminal to your thermostat. It’s normally used to provide a return path to power the thermostat. If the C wire is there, then we use it with the batteries as a backup. "We recommend using a C-wire since this is the most straightforward way to provide power to your smart thermostat," Anzalone says. I have to admit, it seems a bit hackerish, but it works! Given that you thermostat needs one. Start with the first video and follow along in order until you find the solution that’s right for you. Yes, you need an extra wire in the bundle going to the thermostat. YES – This means your thermostat is using a C-Wire, and you don't need to install a C-Wire Adapter. Blue wires are also called “C” wires because they are the Common wire. You may also check the price of the product in your local market. A C-wire is just one of the wires that runs from the furnace to the thermostat. 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. Then you go through the step-by-step setup process and your thermostat is ready to use. It is often labeled as “c” on thermostat backplates. Thankfully installing a smart thermostat without a C-wire is pretty simple. Here’s the transformer that I personally like because it has a 20′ cord to reach a far outlet. The common wire, sometimes referred to as the c-wire, is what’s responsible for delivering constant power to your thermostat. If you have C-Wire install it simplifies the smart thermostat installation process. 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 find some really inexpensive C-Wire power adapter on Amazon. Substituting a G Wire for a C Wire. The thermostat C wire can be either blue or back. The most “meaty” part of installing a new Honeywell smart thermostat, is correctly wiring it up. If there is no C wire, we can use the Smart thermostat with just the batteries. It provides a constant 24 voltage to the thermostat. If it can’t, you have a few choices: Check if there’s an existing thermostat wire you can use as a C wire. Snap the thermostat to the mounting plate. For Sensi™ Smart Thermostat, a common wire (c-wire) is required for heat only systems, cool only and heat pump systems. If you do not have any loose wire in the bundle, an “add-a-wire” adapter can come in handy. When you peek behind the cover, you’ll be able to see what you’ve got. Do you have a C-Wire? Label and disconnect each wire. For Sensi™ Smart Thermostat, a common wire (c-wire) is required for heat only systems, cool only and heat pump systems. Now, it’s your turn to install the new thermostat. You can even use the fan wire to serve as a “C” wire. The app may also test to check if the C wire can deliver enough consistent power to your Nest thermostat. If you have a Trane model thermostat, and have a wire labeled X or B refer to your thermostat manual. Screw the system wiring to the screw terminals on the new thermostat using the letter labels as reference (strip the wires back if necessary). A lot of Nest users have had problems when they use the thermostat without a C-wire. First, you connect wires to the thermostat. During initial setup, the app will tell you if you should connect a C wire to your thermostat. In this guide on “thermostat c wire” – we explain everything you need to know about the Common wire, known popularly as the C wire. This will remove your ability to turn your system fan on, however the fan will still run when your system runs. Reply. Label the wires Y, G, R, and W. Note: If you don't have a W wire, the system is still compatible. What is the C Wire on a Thermostat? Wyze Thermostat was made to control low voltage (24V) heating systems only. Unused C Wire Terminal. In some cases, one of those wires may be your common. The Wyze T-Stat installation video shows C-wire adapter installed (magnetized on the furnace). This quick guide will explain what a “c wire” is, what color it could be and how best to install … 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. Insert the wires into their corresponding terminals as shown below. Check your HVAC control board to see if it has a wire connected to its C terminal. I had no C-wire, so I was only left with the red, green, yellow and white wires. This is known as the common wire. Venstar Add-a-Wire adapter. To install with CWA, you must disconnect the 4 wires from the control board and connect them to the CWA. If your thermostat wires connect to terminals marked R and W, installation is as simple as connecting a third wire to the common on the furnace or boiler's low-voltage Common point. 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. If you’ve got a budget of $30, then you can get a decent adapter. C-wire help made simple. What Is The C-Wire? One common problem when installing a smart thermostat is the lack of a c-wire in your home’s wiring. You may also have a W wire, which is likely white, while the E wire is usually brown. 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. For Sensi™ Smart Touch Thermostat, all system types require a common wire (c-wire). If you have a fan relay, it will likely be marked G and be green. While this is true, it would be advisable to have a C-wire. 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