Smart thermostats usually … is that more smart thermostat manufacturers will cater to this large market! In all cases, the best first step is to figure out what heating system you have and work from there: find out which manufacturers support your system and accessories. As an aside, a lot of manufacturers assume you have both heating and cooling. Connected each one to the C terminal and wired up my smart thermostats. 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's already a white wire at the C … If you don’t see a wire you can identify as the C-wire, though, don’t despair yet – you may need to look behind your existing thermostat. Also, the Stelpro is a Z-Wave or ZigBee thermostat. Hi everyone! Our ecobee Smart Si thermostat rating: Smart Si at a Glance PROS Easy to create…, You've probably heard the term "low voltage" or "24v" while researching smart thermostats - but…, Heating and cooling account for nearly half of your home's energy costs! Kill the furnace and power. C-Wires are required on all Honeywell Home / Resideo Wi-Fi thermostats. However, this thermostat also does not work with line-voltage heaters that use a fan. It worked great….except that after a little while I noticed the house was not … Another option for line voltage systems: the Stelpro KI STZW402WB+. 1. Typically, the wires that provide the power (often called the “hot” wires) are labeled R c … The Blue or “C” Wire. This means it is not programmable by itself. If you have a low-voltage system with too few wires and you don’t want to (or can’t) run new wires, then check out the LuxGeo: many of its users report it works in their HVAC system when nothing else does. New comments cannot be posted and votes cannot be cast. These first few options assume you have a low voltage system. Plan Your Wiring. If you have 9V, you can pretty well assume that that C conductor is unused. (There is some hope with an adapter, but don’t get too excited yet.). 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. In our example, we used an Ecobee thermostat during this install. A subreddit for ecobee and all their smart home products. 1. In some cases, one of those wires may be your common. Put the thermostat face plate back on. First and foremost, check to be sure it is set to “heat”. Best case scenario: you find five wires (white, red, yellow, green, blue) and possibly a sixth black wire. You can either run that … Yes sir you are. The black wire from the thermostat bundle is unconnected on the furnace side, and … C = This is the common wire … https://smartthermostatguide.com/thermostat-c-wire-explained/. Remember, this is a site run by tech enthusiasts, not an HVAC expert familiar with your system, so be careful when you mess around with wires! The only catch is you have to already have a minimum of four wires present. The red/white wire cable are on C… This *should* work. Use the thermostat wiring connection guide the way it is EXCEPT connect the G (green) wire to the C (common) terminal. Have connected C wire to new thermostat and made sure connected same wire at furnace terminals. 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). Odds are the conductor on the C terminal is, as you wrote, the compressor. Depending on your home, this may be a short distance or daunting task. The furnace switch is usually mounted on a wall near the furnace, or sometimes even on the furnace itself. You most likely have a line voltage system and none of the popular smart thermostats on the market are available to you as-is. Adding a C-wire to 24VAC systems is what this thing exists for. A smart thermostat offers both…, WiFi-enabled thermostat reviews and comparisons. If your current thermostat didn’t need a C-wire, it (or a wire that can be used as a C-wire) might be rolled up inside the wall. 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. Now, if you have a heat pump or a boiler or other accessories you should check for compatibility on those, too, but chances are if you made it this far, there’s something on the market compatible with your system. Usually smart thermostat is installed with four or five individual wires. If the thermostat does not require a C common wire (the neutral side of the transformer) then you could just use the 2 wires. Everything you need is here! See the Stelpro KI STZW402WB+ on Amazon.com. If you don’t have a C-wire and your heart is set on having a smart thermostat in your home, your have a bunch of options (which can be mostly be boiled down to “get a C-wire” or “get a smart thermostat that doesn’t require a C-wire”). Older wires will have only 2 or 4 strands but the 5 strand will provide that extra wire … Put the access panel back on the furnace. Press question mark to learn the rest of the keyboard shortcuts. Remember to tag the G wire as the C, so that you wouldn’t be confused. 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. The C (common) wire is supposed to be blue and normally attached to chassis ground at the furnace. Although I’ve seen it stated in several places, it’s not entirely correct to say that the c-wire is what powers the thermostat. The ecobee requires a C wire to power on. It should be straightforward, though. Line voltage thermsotat scenario: you have just two wires (white and red, probably), and they’re thick. My (horrible old!) The C-Wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. 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. As already mentioned, turn off the furnace when you are connecting the wires. You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. furnace). Red/R* – power wire for your heating and cooling system. If ecobee isn’t for you for whatever reason, though, you can still grab a Venstar Add-a-Wire and pair it with the thermostat of your choice. Lucky you! Have checked and replace fuse on circuit board (old one did not look blown) I am getting 24 volts power on the R terminal measure at the furnace and the thermostat. visiting our quick visual guide to thermostat types, applying Venstar’s instructions to your unique situation, ultra deluxe Alexa-built-right-in ecobee4, Caleo by CaSA is a WiFi enabled thermostat, Is your wiring compatible with a smart thermostat? 15% off Amazon Echo and Tap – today only! Questions about the C-wire are by far the biggest drivers of traffic to this site, so I’ve written this article to help you understand what the C-wire is, help you find your system’s C-wire, and help you decide what thermostat to buy based on what wires you have and/or are willing to install. C-Wires are required on most Honeywell Wi-Fi thermostats, with the exception of the Smart Round Thermostat (formerly known as the Lyric Round). It’s a wire that (if you have one) runs all the way from your furnace to your thermostat. At the furnace, the unused wires are not connected to anything--shown here at the bottom. 2. Almost there scenario: you find three or four thinner multicolored wires. Here’s how to determine if you have a c-wire thermostat: Turn your thermostat to the off position. … You can also use this wiring … Also, you’ll need one for every line voltage heater you have, and chances are (if you have line voltage), you have a few heaters. Make sure you have a wire connected to the thermostat C terminal. Contrary to its name, the C wire isn't actually all that common. Some systems don’t provide this, and it’s not necessarily required by every thermostat, since some can be … Behind each thermostat, I had an unused wire. Technically speaking, power flows from the R (red) wire, but not continuously (not on its own, anyway). This switch may power the low-voltage thermostat as well as the furnace. Detach your current thermostat … C wire adapter kits can allow an existing 4-wire system to work with a thermostat … Let's take a look at the G wire. STEP 1 – SOME PREPARATION. You … Next, let's talk about the C, or common wire. The cover is either held onto the back plate by snap clips … That closes the 24-volt control side of the gas furnace, and begins the process of starting the gas furnace into its sequence of operation. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. Our hope for 2018 and beyond (since we own a line-voltage house ourselves!) Every ecobee ships with an adapter that you can install yourself at your furnace to make up for a missing C-wire. Get at best 2-4 volts on C wired measured at the furnace and the thermostat. 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