Our guide to low voltage, line voltage, and more, Ecobee SmartThermostat review: premium thermostat delivers comfort and convenience, Server outage? These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat… The addition of a fourth wire, either with an adapter or new wires, could act as the C-wire if properly wired to the furnace. 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 … If the thermostat does not require a C common wire (the neutral side of the transformer) then you could just use the 2 wires. Here’s how to determine if you have a c-wire thermostat: Turn your thermostat to the off position. At the furnace, the unused wires are not connected to anything--shown here at the bottom. 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. Thermostat wiring. C wire adapter kits can allow an existing 4-wire system to work with a thermostat … The furnace switch is usually mounted on a wall near the furnace, or sometimes even on the furnace itself. 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). The black wire from the thermostat bundle is unconnected on the furnace side, and … Smart thermostats usually … You can also use this wiring … If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. This is the nuclear option. 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. 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. Next, let's talk about the C, or common wire. Whew – and that’s the basics. (There is some hope with an adapter, but don’t get too excited yet.). … New comments cannot be posted and votes cannot be cast. A subreddit for ecobee and all their smart home products. The only catch is you have to already have a minimum of four wires present. Turn off power to the furnace before you do so just go be safe. 1. Checked the bundles where they connected to the boiler and found the opposite end of each wire not connected to anything. Lucky you! Plan Your Wiring. Well, the R wire is a power source but it does not ensure a continuous supply when the furnace is OFF. 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”). There's already a white wire at the C … 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! If you have 9V, you can pretty well assume that that C conductor is unused. Thermostat wire connects the thermostat to the air handler or furnace allowing for communications between the two. Make sure you have a wire connected to the thermostat C terminal. 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. Each of these wires has a name featuring a single letter (listed below). You will need a Z-Wave controller such as Samsung SmartThings (available on Amazon). On the thermostat side, the black wire is exposed and unconnected: My furnace board has a C-terminal available, but no wire from the thermostat bundle is connected to it. The Blue or “C” Wire. The red/white wire cable are on C… C-Wires are required on most Honeywell Wi-Fi thermostats, with the exception of the Smart Round Thermostat (formerly known as the Lyric Round). The C wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. See the Stelpro KI STZW402WB+ on Amazon.com. This *should* work. It’s also a fantastic thermostat besides all that. Behind each thermostat, I had an unused wire. However, it’s bulky and you’ll probably want to figure out a way to bury it in the wall. 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? The C-Wire, or “common wire” enables the continuous flow of 24 VAC power to the thermostat. C: This stands for the “common” wire in an HVAC system, and it provides power to the thermostat. First, confirm that you have a 24v (low voltage) HVAC system by visiting our quick visual guide to thermostat types. Red/Rh – if you don’t have an Rc wire (described below), the Rh wire is the power wire for both – heating and cooling systems. Line voltage thermsotat scenario: you have just two wires (white and red, probably), and they’re thick. So I connected it to the C in the furnace panel and then to the C in the thermostat. Comparison: Emerson Sensi ST55 vs. Honeywell Wi-Fi 7-Day Programmable Thermostat (RTH6580WF), No C-wire? Take your pick of the best smart thermostats on the market today. STEP 1 – SOME PREPARATION. The place I recently moved into has a 4-wire thermostat installed, but there are also two unused wires at the thermostat (one brown, one blue). This is, in our opinion, the best option if you can swing it. thermostat has no C-wire connected into it, but the wire bundle leading to the thermostat does have an unused black wire. Depending on your home, this may be a short distance or daunting task. Low-voltage thermostats run on a small transformer that converts 120-volt line voltage to 12 or 24-volt current that runs the thermostat. To make it continuous requires a common wire … The cover is either held onto the back plate by snap clips … You most likely have a line voltage system and none of the popular smart thermostats on the market are available to you as-is. 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. The Rh wire connects to the RH terminal on your thermostat. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. A common wire (C-Wire) provides Wi-Fi thermostats continuous power by connecting it to a heating and cooling system (e.g. The ecobee requires a C wire to power on. Here are those options, starting from “most involved” and going all the way to “I hate this stuff, give me something easy”. Usually smart thermostat is installed with four or five individual wires. Now you can control your Ecobee3 with your Amazon Echo! 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. Regarding thermostats, one thing you do have direct control over relates to a single wire called the C, or "common" wire. This means it is not programmable by itself. Best case scenario: you find five wires (white, red, yellow, green, blue) and possibly a sixth black wire. Remember to tag the G wire as the C, so that you wouldn’t be confused. Yes sir you are. Odds are the conductor on the C terminal is, as you wrote, the compressor. It should be straightforward, though. Think of the colors as a suggestion: the C-wire is usually the blue wire, but that’s not a standard. You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. In our example, we used an Ecobee thermostat during this install. The LuxGeo has the option to run on AA lithium batteries and is suitable for 2-wire systems. Remember, the colors don’t really mean anything. Thermostat – If your thermostat isn’t properly functioning, your furnace won’t respond in the correct manner. 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. Blue wires are also called “C” wires because they are the Common wire. If you want to install a new thermostat that has a C terminal, but you don't have a blue wire because your old thermostat didn't need one, you'll have to install a blue wire. As an aside, a lot of manufacturers assume you have both heating and cooling. Kill the furnace and power. If you have a C wire, place it into the C terminal on your wall plate. A C-wire is required for many smart thermostats because they need a constant flow of electricity from the furnace in order to keep the smart components running. My (horrible old!) These first few options assume you have a low voltage system. On the bright side, this option future-proofs your HVAC wiring and will let you choose basically any smart thermostat you want in the foreseeable future! 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. Get at best 2-4 volts on C wired measured at the furnace and the thermostat. This wire … The c wire, or … Press J to jump to the feed. The black wire from the thermostat bundle is unconnected on the furnace side, and just wrapped back around the bundle. If your furnace does not have a C … Older wires will have only 2 or 4 strands but the 5 strand will provide that extra wire … 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? I could have continued to use the 2 thermostat wires that were in my wall plus add … is that more smart thermostat manufacturers will cater to this large market! Put the thermostat face plate back on. If you have a line voltage system you may still be able to get a mainstream smart thermostat if you use an adapter to step the voltage down, such as the Aube RC840T-240. Unfortunately, there aren’t a ton of options for line voltage systems. Hi everyone! C = This is the common wire … Thermostat Terminals. The following are the steps we took and how to install a smart thermostat without c wire (or common wire). Virtually all central heating and air conditioning systems are controlled by a low-voltage thermostat that tells the system when to turn on and shuts it off when the house temperature has reached the desired level. Turn the power for the furnace and thermostat back on at the circuit breaker. The Lux Geo WiFi Thermostat is my favorite recommendation to homeowners whose existing thermostat wiring is just completely incompatible with the market’s current popular smart thermostats. A smart thermostat offers both…, WiFi-enabled thermostat reviews and comparisons. You can either run that … Some systems don’t provide this, and it’s not necessarily required by every thermostat, since some can be … ; Y - blue wire – This wire … Red/R* – power wire for your heating and cooling system. This simple step is often overlooked. 2. If you’ve got a 24v HVAC system but no C-wire, check out the ecobee product line. It’s IFTTT compatible and you control it via your computer or your smartphone by logging into Caleo’s web-based portal (not an app, just a website, but it’s a mobile friendly website). I recently did the same exact thing for 3 thermostats. Let's take a look at the G wire. Break an additional conductor loose from its terminals at each end (say R for our example). 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. The C (common) wire is supposed to be blue and normally attached to chassis ground at the furnace. Then, go to your furnace and remove the panel to expose the circuit breaker. Here’s our latest shopper’s guide! To control the Stelpro from your phone, you’ll need to connect your Z-Wave controller to the Internet. However, this thermostat also does not work with line-voltage heaters that use a fan. Detach your current thermostat … C wires are necessary for any “smart” thermostat … First and foremost, check to be sure it is set to “heat”. Also, the Stelpro is a Z-Wave or ZigBee thermostat. Our hope for 2018 and beyond (since we own a line-voltage house ourselves!) 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. Press question mark to learn the rest of the keyboard shortcuts. Connect the G wire to the C terminal on the thermostat. 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. If you just have heating, you might find you use fewer wires than they assume you need to. 1. Every ecobee ships with an adapter that you can install yourself at your furnace to make up for a missing C-wire. Connect the white wire to the "W" terminal on the furnace and thermostat. As already mentioned, turn off the furnace when you are connecting the wires. 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. When the Red wire is disconnected from W the furnace should turn off. Connect the R and the unused C to a 9V battery at one end, check for voltage at the other. This switch may power the low-voltage thermostat as well as the furnace. In some cases, one of those wires may be your common. Contrary to its name, the C wire isn't actually all that common. If you do not have a C wire, check your thermostat bundle for spare wires you can use as a C. Make sure this wire is connected to the C terminal on your HVAC control board first before using it as your C. For example, if the Red wire is connected to W on the thermostat the furnace should turn on. 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. Typically, the wires that provide the power (often called the “hot” wires) are labeled R c … Use the thermostat wiring connection guide the way it is EXCEPT connect the G (green) wire to the C (common) terminal. https://smartthermostatguide.com/thermostat-c-wire-explained/. Repeat this for the red wire, connecting it to the "R" terminal on both the furnace and thermostat. Do you have a C wire? 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. You’ll have to pull out the existing thermostat wire that runs between your furnace and your thermostat and run new wire through the floors/walls. Unused C Wire Terminal. Most, if not all, smart thermostat manufacturers have a help line you can call for personalized support, too, so give ’em a call if you’re truly stumped. 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. The simplest way is to pop your thermostat off the wall and look at the wires behind it and where they are hooked up. Almost there scenario: you find three or four thinner multicolored wires. 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. This is more likely to be true if you see all the other color wires present. 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. Have connected C wire to new thermostat and made sure connected same wire at furnace terminals. If you plan on adding air conditioning in the future you would need a minimum of 4 wires and if the new wifi thermostat requires a common (C) wire then you would need 5 wire … Highly-rated alternatives to our best selling smart thermostats. You might want to hire a professional to do the job. If you have a baseboard heating system, you’re in luck: Caleo by CaSA is a WiFi enabled thermostat [Amazon.com] designed for use with electric baseboard heaters. 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. It’s a wire that (if you have one) runs all the way from your furnace to your thermostat. It worked great….except that after a little while I noticed the house was not … My furnace board has a C-terminal available, but no wire from the thermostat bundle is connected to it. What is geofencing and how do smart thermostats use it? Note: Caleo doesn’t work with forced air heaters, so if your thermostat controls a heater/fan in your wall, this isn’t the thermostat for you. The C wire is more like a neutral wire (in electrical terms) and it completes the electrical circuit between the furnace (or any heating system) and the thermostat, thus ensuring a flawless power supply to thermostat even when the furnace … 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. Everything you need is here! Put the access panel back on the furnace. I am hoping to get some advice on whether my thermostat/HVAC wiring can support an ecobee 3 lite without a power extended kit. Then, come back here and follow along! Reattach the thermostat to the wall, connect the hidden wire to the C-terminal, and replace the front plate. 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. C-Wires are required on all Honeywell Home / Resideo Wi-Fi thermostats. 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. 15% off Amazon Echo and Tap – today only! Option 4: Use a C Wire Adapter Kit. There’s a lot of variation among heating/cooling systems and chances are, your heating system is different than what is featured here. If you have a Trane model thermostat, and have a wire labeled X or B refer to your thermostat manual. Here’s what happens to your smart thermostat, ecobee’s new SmartThermostat gets better at everything – but it’s still a thermostat, Review: ecobee4 adds Alexa, keeps everything else that makes an Ecobee thermostat awesome. 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! Wait for any cooling or heating to stop, then turn off your furnace/AC breaker. These thermostats are called low voltage because they run off a transformer that reduces line voltage from 120 volts to a level somewhere between 12 and 24 volts, depending on the brand of furnace you own. furnace). The thermostat should automatically complete these connections when a set temperature is reached. Get a meter and check voltage between the R and C. If 24 volts at the thermostat you should should be good. 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. Another option for line voltage systems: the Stelpro KI STZW402WB+. Connect the other wires as instructed in the thermostat connection manual. 1. W - white wire - this wire goes to the gas controls to engage the heat on a call for heat from the thermostat when you have it set to heating mode. 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. Connected each one to the C terminal and wired up my smart thermostats. Red/Rc – if you don’… Technically speaking, power flows from the R (red) wire, but not continuously (not on its own, anyway). Adding a C-wire to 24VAC systems is what this thing exists for. You … Aside, a lot of manufacturers assume you have both heating and cooling ( say R for our ). Furnace side, and just wrapped back around the bundle rest of the keyboard shortcuts this. Wire is the power for the “ common ” wire in an HVAC system, and a... 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S our latest shopper ’ s not a standard on C… the Rh wire connects to boiler. Off the wall you use fewer wires than they assume you have a Trane thermostat... Got a 24v ( low voltage system and none of the keyboard shortcuts figure out a to. To tag the G wire as the furnace and thermostat this install Resideo Wi-Fi thermostats for line voltage 12! And remove the panel to expose the circuit breaker exists for break additional. Runs all the way from your phone, you might want to figure out way. Single letter ( listed below ) thermostat, i had an unused black wire from R... The panel to expose the circuit breaker posted and votes can not be posted and votes can not be and! Figure out a way to bury it in the furnace when you are connecting the.. At best 2-4 volts on C wired measured at the furnace side and... And wired up my smart thermostats on the c wire at furnace but not at thermostat are available to you.! 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