The Blue or “C” Wire. Well, the R wire is a power source but it does not ensure a continuous supply when the furnace is OFF. Regarding thermostats, one thing you do have direct control over relates to a single wire called the C, or "common" wire. The easiest way to check if your existing thermostat has a ‘C’ wire already installed is to take the front of the thermostat off and look. There are plenty more scenarios besides these but these are the three I see most frequently and hopefully one of them bears some resemblance to your setup. The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. 2. The cover is either held onto the back plate by snap clips … 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. Hi everyone! Here's a picture of the thermostat board: I see there is already something else connected to my C terminal, which I am guessing is my AC compressor. Unused C Wire Terminal. The thermostat should automatically complete these connections when a set temperature is reached. is that more smart thermostat manufacturers will cater to this large market! Each of these wires has a name featuring a single letter (listed below). Oh, and you will have to open up your furnace and probably spend 20-40 mins opening things up, applying Venstar’s instructions to your unique situation, and hooking it up. C wires are necessary for any “smart” thermostat … Turn off power to the furnace before you do so just go be safe. Connect the white wire to the "W" terminal on the furnace and thermostat. C: This stands for the “common” wire in an HVAC system, and it provides power to the thermostat. If you already have four wires and just need a fifth to be the C-wire, you’re a good candidate for a Venstar Add-a-Wire adapter. It’s small, easy to install, and ships with every ecobee from the ultra deluxe Alexa-built-right-in ecobee4 down to the “budget” option, the ecobee3 lite (which sacrifices nothing other than built-in Alexa and room sensors, which you can still buy and add later). STEP 1 – SOME PREPARATION. The simplest way is to pop your thermostat off the wall and look at the wires behind it and where they are hooked up. I noticed an unused blue wire and when I opened the furnace control panel I noticed that the blue wire was not connected to anything on that end either. Typically, the wires that provide the power (often called the “hot” wires) are labeled R c … Best case scenario: you find five wires (white, red, yellow, green, blue) and possibly a sixth black wire. Our guide to low voltage, line voltage, and more, Ecobee SmartThermostat review: premium thermostat delivers comfort and convenience, Server outage? There's already a white wire at the C … Am I correct in thinking that I can just connect that unused black wire to the C terminal on my furnace, and let it serve as my C-wire? Smart thermostats usually … First and foremost, check to be sure it is set to “heat”. Yes sir you are. With this adapter in place, you can shop for the low voltage thermostat of your choice and use it with your electric wall heater, electric baseboard heater, radiant heat, etc. Low-voltage thermostats run on a small transformer that converts 120-volt line voltage to 12 or 24-volt current that runs the thermostat. Contrary to its name, the C wire isn't actually all that common. Here’s our latest shopper’s guide! Odds are the conductor on the C terminal is, as you wrote, the compressor. Blue wires are also called “C” wires because they are the Common wire. Checked the bundles where they connected to the boiler and found the opposite end of each wire not connected to anything. A smart thermostat offers both…, WiFi-enabled thermostat reviews and comparisons. Get at best 2-4 volts on C wired measured at the furnace and the thermostat. To control the Stelpro from your phone, you’ll need to connect your Z-Wave controller to the Internet. Watch an easy solution to install a wifi thermostat without a c (common) wire. As of this writing in early 2018 there are not many WiFi-enabled options for line voltage thermostats. Install a Nest thermostat at your own risk, Best WiFi-enabled Smart Thermostats of 2018 – Holiday Buyers Guide, Crunching the numbers: 3rd-party projects and alternative ways to analyze your Ecobee or Nest data, 6 reasons you might NOT save a bundle with a smart thermostat. Is geofencing and how do smart thermostats use it exact thing for 3.... To 12 or 24-volt current that runs the thermostat the power for the furnace conductor the! You do have an Rh and ‘ white ’ wire to power on they ’ thick! 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