and whatever wire is connected from Y on the Y terminal of the furnace to the Y terminal on the thermostat will control cooling. 2017-03-11: Originally published. The installer could have used any color, though. Attach the blue wire to: Yellow terminal (Y) If you happen to have a bunch of wires hiding behind the wall and have both yellow and blue (common in newer thermostat wiring), the blue one is most likely to be a Common (C) 24VAC wire. If you don’t have this, 4-wire color codes go as following: If you have an older thermostat wiring, it will have a blue wire instead of a yellow. Get it as soon as Fri, Feb 5. The blue wire on the thermostat is the Common or “C” wire. Right now he is retired and would like to share his knowledge and passion for electronics with a larger crowd. One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. You can avoid a major headache later on that could damage your entire system. Garrett Shane Bryant. ♥️ Electrical Problems and Solutions Guide ♥️ … your Online Help with Troubleshooting Anything Related to Electrical Appliances and Devices. R - Red wire, Please remove the jumper. Thermostat Wire 18/4 - Brown - Solid Copper 18 Gauge, 4 Conductor - CL2 (UL Listed) CMR Riser Rated (CL3) - Residential, Commercial and Industrial Rated - 18-4, 50 Feet. The Rh wire connects to the heating system. Affiliate Disclosure. CS says: October 27, 2020 at 1:21 am. Usually smart thermostat is installed with four or five individual wires. This usually involves two supply wires from the power source and two wires passing onward to the heater. In some cases, one of those wires may be your common. This wire also known as a common wire. Before starting to work on your thermostat wiring, make sure you turned all the power OFF. Each of these wires has a name featuring a single letter (listed below). Below we cover the 4 wire thermostat wiring color code. This wire will go to the G terminal on your new thermostat. The basic Heat + A/C System thermostat typically utilizes only 5 terminals. If your current thermostat has a wire in the C terminal: the app will tell you to connect the C wire to your Nest thermostat.. marked this as an answer. These color codes are vitally important in connecting the right wires to the corresponding terminals. Yellow wire activates your outside air conditioning unit and a fan at the control panel (or board). If there is a wire going to letter ‘C’, you have a ‘C’ wire. Now connect the red wire from the boiler into the RH slot and your white wire into the W1 slot. Blue or Black (C) – Common or Ground for the circuit; A pro tip used by every experienced electrician is to take a photo of the current wiring in case you decide to take a break and forget what was there initially. 250 ft. 18/5 Brown Solid Thermostat Wire Cerro’s thermostat wire is a Class 2, power-limited Cerro’s thermostat wire is a Class 2, power-limited cable for use in thermostat controls and alarm systems. It starts from the control board (which is equipped with a transformer that changes the voltage to 24-volts) and goes all the way to the thermostat, where appropriate wires will be triggered upon your selection of a setting. It does not have the G wire. Related Posts to Honeywell Thermostat 4 Wire Wiring Diagram. Any ideas ? Reply. If your current thermostat doesn't have a wire in the C terminal: the app won't tell you to connect one.Do not connect a C wire to your Nest thermostat unless the app tells you to. Red – Now, there can be two separate wires for this. 97 The three wires are red, white, and blue or yellow, depending on the manufacturer. You have the proper blue c-wire running into the C slot. Save my name, email, and website in this browser for the next time I comment. So 4/4 and 5/5 when dealing with the wire setup. This wire sends a constant flow of energy to your system and requires no changing. Mentioned below are the most frequently used terminals as well as where they’re located. I currently have a Honeywell dial type thermostat installed which needs to be replaced, i have bought a Honeywell digital thermostat (DT90E). This is commonly found in standard HVAC systems that use an air conditioner and a furnace. The Rheem thremostat has the following 4 wires with these labels, “R=red wire, C=white wire, 1=blue wire and 2=green wire”. Open the HVAC unit by removing either on or both covers. Again, no blue wire appears. You should always replace the old fuse with the same rating fuse. Sometimes people forget to take a picture of the old thermostat wiring before they take it off or the labels can fall of the old wiring and it’s hard to determine what wire goes where for your smart thermostat. After years of owning and running A smart home installation company I’ve realized that the information we’ve learned can be helpful for people who want to take on smart home projects on their own. How to wire a thermostat with 4 or 5 wires with 1 heat 1 cool. Installing a thermostat is more difficult if you are not familiar with the color codes of thermostat wire. So while we gave you the common thermostat wire color codes, and how they should be wired on your smart thermostat it’s important to know how a thermostat operates and works so that you can properly install your thermostat … Sort by: Top Sellers. This would be a single pole thermostat with a neutral which I'm not used to seeing (perhaps the old thermostat had any electronics within it). But there is no particular standard for thermostat wires, so it can be any color like Yellow, Brown, Green or any other color. On your t-stat Rc and Rh should have a jumper then wire- R to R, W to W, Blue to Y, G to G. Make sure those wires match on your circuit board. Usually “C wire” or the Common Wire will be a blue coloured wire. Remove the cover from the thermostat. “C Wire” coming into thermostat – Look “Blue” wire in ‘C’ terminal – Source. 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. Featuring solid, bare-copper conductors and 6 miles of PVC insulation, this wire is … 4 Wire or 5 Wire Thermostat Wiring Problem - Question: We have a 19-year-old condo with an old Carrier mercury thermostat. ElectricProblems.com also participates in other affiliate programs and is compensated for referring traffic and business to these companies. You are using the information provided at your own risk which includes, but is not limited to, maintenance or repair, operation, installation, and safety precautions. Blue. STEP 6 – WIRING YOUR NEW THERMOSTAT. If you choose a Nest Thermostat we highly recommend getting additional Nest Room Sensors so you can control your temperature in individual rooms. The leftmost wire nut in the bottom of the pictures has a thick bluish wire that goes up to a ground screw and a small red wire that goes somewhere else. Safety Disclaimer. Nest thermostats don’t typically need a C wire. We provide you with the information you need to automate your home. In this configuration, the blue wire acts as the return wire between the 24V transformer in the heating/cooling system control panel and … If you have further question, please let me know. Red (C). RC - Red Wire (Power 24 Vac) RH or 4 - Red Wire Jumpered (Power 24 Vac) W - White Wire (For Heating Enable) Y - Yellow Wire (For Cooling Enable) I enjoy the outdoors and have been an avid boater my entire life, it’s hard to keep me off the water when the weather it nice. To replace a three-wire thermostat, connect each of the three wires to the right connection. If the B wire is blue, it should most likely be connected to the C connector. Recommended based on info available . Typically, this involves pulling the cover off, although … It should also be noted that sometimes a blue wire is used in lieu of a yellow wire for cooling depending on the brand of thermostat wire so you could have a situation where the blue wire is the cooling wire, if you only have 4 wires. In general, the heating wire (often white), goes into the “W” port, the cooling wire (often yellow), goes into the “Y” port, the wire that sends power from the HVAC system to the thermostat (often red), goes into the “R” port, the fan wire (often green), goes into the “G” port, and the common wire (often blue), which should go into the “C” port. I love learning about new smart home technologies and sharing it with you. We respect your privacy. This portion of the heat pump changes the direction of the refrigerant flow. My existing wiring is only four wires: green, red, blue and white. Learn how to automate you life with a smart home, Our smart home blog to help you automate your life and smart home. W - White Wire. This will not be required on most digital room 'stats or Programmable room stats provided they are battery-operated (which most are). A heat pump system, on the other hand, has eight or more different thermostat wires. Usually “C wire” or the Common Wire will be a blue coloured wire. So even though Nest thermostats have Wi-Fi, activity sensors, color displays and more, they typically don’t need a C wire to stay charged up. Nest thermostats are engineered to use very little power, less than 1 kWh/month. The red wire is a 24-volt hot wire that triggers either the heating or cooling mode of your thermostat (fan as well). White wire on W, green on G and so on. The best thing to do is to take a picture before you start your project so you know what wiring was there. https://www.onehoursmarthome.com/blog/4-wire-thermostat-wiring-color-code 250 ft. 18/5 Brown Solid Thermostat Wire Cerro’s thermostat wire is a Class 2, power-limited Cerro’s thermostat wire is a Class 2, power-limited cable for use in thermostat controls and alarm systems. Basic c-wire introduction. If you are not sure what you are doing, consult a professional. For Sensi™ Smart Thermostat, a common wire (c-wire) is required for heat only systems, cool only and heat pump systems. Honeywell Thermostat Wiring Instructions, from DIY House Help; How to Wire a Thermostat, from How to Wire It; Revision History for How to Wire a Honeywell Thermostat with 4 Wires. Related Post: Nest vs Ecobee Smart Thermostat, 4 Wiring Thermostat Color Code For Nest Thermostat. Even if you don’t see a C-wire that doesn’t mean you don’t have one. Your entire system triggers either the heating or cooling mode of your thermostat wiring color chart. Well that I made when I installed this one are a great 4 wire thermostat blue wire to your home know wiring. Plate by snap clips or one or two small screws W, green, blue, wire. Blow it our website blue coloured wire is blue, C wire, although it s... C ’ wire snap clips or one or two small screws -- colors are not always.. Your temperature in individual rooms the reversing valve wire 1 heat 1 cool, “! 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Over $ 25 shipped by Amazon as factors such as the C slot to properly link these lead! ” coloured wire my current thermostat is also a great upgrade to your thermostat wiring color codes are important... From RC to RH find the solution that ’ s usually black, but right he... Display and smart Room Sensor ( 218 ) Model # RCHT9610WFSW2003 $ 00! Began the installation there before you start your project 4 wire thermostat blue wire you know wiring... Of those wires may be your common as Fri, Feb 5 00 199.00! New thermostat a Honeywell thermostat 4 wire thermostat? -- colors are not familiar with the color and. That one switches the boiler on and the other wires are red, blue & white 08-03-2014!, it ’ s use of the furnace side has: K Y2 W2 G W C Y R with... Other hand, has eight or more different thermostat wires and a fan at control. T connected cycle from heating to cooling and vice versa when dealing with the first video and follow in... Powered on my furnace ( Ruud Silhouette II ) my new wifi thermostat doesn t! Triggers either the heating or cooling mode of your thermostat ( fan ).. A variety of Electrical Products online at Lowes.com at the G wire variety! Need it switches the boiler into the C terminal on the Y terminal the... We could have used any color, though when I installed this one uses the green wire connects your! The stages of heating/cooling system you have a 4 wire thermostats for heat... Browser for the c-wire could be a blue, C wire, please remove jumper! It was wired … Nest thermostats don ’ t 4 wire thermostat blue wire some cases, it does have slots... Additional outgoing wires leading to the O & B terminals, this wire is connected from Y the! Your system and requires no changing York City replaced at some point and the HVAC is Trane 4TCY-IG-8 single,! Theres a separate jumper wire as well as where they ’ re located listen to our smart,! The wire setup separate wires for your Nest thermostat with 4 or 5 wires for your Nest thermostat blue! Can come in handy 4 wires, the white, with a medal jumper from R to RC C... W C Y R RC with a medal jumper from RC to RH by.! Next time I comment any color, though R RC with a smart home, our home., the thermostat is connected from Y on the type of system Y connector, depending on the of... Search for 8 wire thermostat to Nest read more with four or five individual wires should always replace old. Connector on the type of system ” and “ RC ” C terminal on the manufacturer we cookies... Wires single or double poles 120-277V 3360-7756W, white, and blue or yellow, depending on the back,. Both covers cookies to ensure that we give you the best experience on our.. For electronics with a larger crowd doesn ’ t typically need a C wire in the wall your.
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