We'll assume you're ok with this, but you can opt-out if you wish. What should be done ? Here's how an inventive redo made an 1830s artifact just right for a 21st-century household, Home Decorating Tips For the DIYer in You. The thermostat is likely a digital thermostat that requires the C-Wire or the common wire to provide power for the thermostat. We do get a small commission from any sales for our affiliates for which we link. For the same type of systems, here is a breakdown for the type of HVAC systems they control: *Some boiler systems have multiple zones. Without the Y control wire the AC won’t work. That’s good news. What do I do with the extra wire? A thermostat with five wires typically controls an air conditioner with a heating system. Orange. However, at the thermostat, I have only four. 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. Your old thermostat is a mechanical thermostat and did not have a common wire running to it. We purchased a new basic thermostat that only has hookups for 4 wires. If it is not there then you will need to pull new wire and rewire. Shut the power off and disconnect the old thermostat using the small flathead screwdriver. Red (C). A wiring diagram is an easy visual representation with the physical connections and physical layout associated with an electrical … It just seems like one wire is missing, and I suppose that is what the jumper was for on the old thermostat.I can upload pictures if it’s helpful. I currently have a programmable thermostat with 5 wires. Please also read our Privacy Notice and Terms of Use, which became effective December 20, 2019. This wire, along with a red wire, go from the HVAC to the outside unit. Your email address will not be published. The heating system will likely be a gas or electric furnace. The Honeywell CT410B1017 Manual 4 Wire Thermostat is a simple to install unit that's compatible with 120, 240 and 227 vac baseboard systems. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. Red (H). Emerson Sensi Wi-Fi Smart Thermostat for Smart Home, DIY, Works With Alexa, Energy Star Certified… starting the gas furnace into its sequence of operation. Use this option to replace virtually any two-wire or four-wire line voltage wall-mounted electric heating thermostat. RC - Red Wire (Power 24 Vac… Some systems still have the older mechanical thermostats, which are typically 4-wire thermostats that control the same type of system described above. 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. This is a 2 wire thermostat for heating only. These cookies will be stored in your browser only with your consent. The blue wire was hooked up into the yellow spot! Ask This Old House home technology expert Ross Trethewey demonstrates how to install a new smart thermostat without an existing common wire. Wiring in the New Base Plate for the thermostat. Either that or call a professional to figure it and to be safe. The basic Heat + A/C System thermostat typically utilizes only 5 terminals. Economical Choice for Homeowners For use with electric baseboards, convectors and fan forced heaters, this thermostat is a practical option. The Rh wire … Many newer thermostats require power, unlike older thermostats, which likely did not require power. The honeywell 4 wire thermostat review will certainly bring you – our dear customers – the best glance of the honeywell 4 wire thermostat. The next t-stat, the Honeywell T87N1026 … How to Upgrade to a Smart Thermostat with Four Wires | This Old House: Live. The old farmhouse had dark rooms, dead ends, and no place to park the kids' boots. We also use third-party cookies that help us analyze and understand how you use this website. Example of an often seen thermostat wall plate, mounted, with 4 wires connected. Mechanical mercury switch thermostats with no special lights do not require the C-Wire. On your new thermostat, you will not have to worry about this. Use our handy calculator to see how many BTU's your natural gas appliances are producing: Copyright© 2020 HighPerformanceHVAC.com |. Featuring solid, bare-copper conductors and 6 miles of PVC insulation, this wire … If you don’t have a common wire, Ross recommends wiring the G wire into the common port instead. This wire is used only for heat pumps. A wiring diagram is a streamlined conventional pictorial representation of an electrical circuit. Most people do not, and they end up calling in a professional to get the job done. You’ll also have to change the wire at the furnace from G to C. 5. These types of thermostats are no longer available because of the mercury and new laws banning mercury in HVAC products. These cookies do not store any personal information. Connect one supply wire to one thermostat wire … Sophisticated gadgets and gadgets also come to boost your home using technologies, one of which can be Nest thermostat. Here is a breakdown for mechanical thermostats and the types of HVAC systems they control: Digital thermostats normally require a power source unless they have a battery backup. It's economical, yet rugged. But … This wire connects to your heat pump (if applicable). Not sure as two greens in a bundle of thermostat wire are not normal. Air conditioner with a gas furnace - 4-wires for single-stage and 5-wires for two-stage, Air conditioner with an electric furnace - 4-wires for single-stage and 5-wires for two-stage, Stand-alone heating systems only (gas or electric) - 2 wires*, Heat pump - this type of system can have up to 7 wires depending on setup, Air conditioner with a gas furnace - 5-wires for single-stage and 6 wires for two-stage, Air conditioner with an electric furnace - 5-wires and 6 wires for two-stage, Stand-alone heating systems only (gas or electric) - 3 wires*, Heat pump - this type of system can have up to 8 wires depending on setup. Mount the baseplate of the smart thermostat to the wall using the provided screws. These links will lead to you purchase a product from another company. There is high voltage inside the unit so if you do proceed to do it yourself make sure you turn the power off before proceeding. There are only four wires going into the existing thermostat - red, green, blue, white. This article will help you – Running New Thermostat Wire along with this article - All About Thermostat Wire and another article will help you gain some understanding of basic control circuits in HVAC if you want to learn more and take it that far. Typically in most HVAC systems, this would be the yellow wire. A common thermostat wall plate, showing a typical 4-wire hookup. Multiple zones require a thermostat for each zone unless you have a digital thermostat system that has linking capabilities for wireless sensors. You could also use a small wire nut with electrical tape. Yellow. I advise calling a pro. a. See the thermostat manufacturers instructions. Yellow – The yellow wire connects to your compressor. C-Wire - Various colors but could be blue or black. 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. The thermostat uses 1 wire to control each of your HVAC system’s primary functions, such as heating, cooling, fan, etc. We have come a long way; hence, we exactly know which direction to … Get the latest This Old House news, trusted tips, tricks, and DIY Smarts projects from our experts–straight to your inbox. Yes, you need an extra wire in the bundle going to the thermostat. I have a white, red, green, and blue wire but no yellow ! Here are 11 home decor ideas from the pros that don’t break the bank. Route supply wires to the thermostat wiring box. 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 … by High Performance HVAC | Thermostats | 12 comments, 4 Wire or 5 Wire Thermostat Wiring Problem - Question: We have a 19-year-old condo with an old Carrier mercury thermostat. In labs researchers used a spectrum of ultraviolet light called UVC to kill viruses. When you only have 4 wires from the furnace to work with, and you cannot run a new cable with more wires, then you’ll likely have to give up some functions of today’s heat pumps, central heating, and central cooling systems… Required fields are marked *. Why. It terminates in your outdoor condenser for reversing valve operation from hot to cold. The G terminal or green wire goes to the blower fan inside the air handler or gas furnace to engage the blow when you turn the thermostat to fan only. If the blue wire came from the yellow terminal on the old stat then it will go on Y terminal on the new stat. This thermostat's … 4 wire thermostat wiring diagram – What is a Wiring Diagram? Here is the industry standard thermostat wire color code used for most systems: White. But when the dust (and fiberglass) settles, you'll enjoy a fatter bank account and more comfortable indoor temps year-round. I need a C wire to install a new wifi thermostat. In an effort of full disclosure, we do have affiliate links on our webpages. You will likely have to trace the wires from the source inside the air handler. I’m trying to put in new thermostat! Wire the smart thermostat to the correct terminals. You already have the 24 volt hot with the red wire, so now you need to either find another wire in that bundle or run all new thermostat wire so you will have the proper amount of wires for the job. Just follow the instructions that come with the new thermostat. The Rc wire connects to the cooling system. This wire goes to your air conditioner and starts the air conditioner into its sequence of operation. This product requires professional installation so it will turn on and off with the blower fan in your air handler but it will offer the protection you need for you and your family from any viruses. However, color is key in most thermostat installations provided the installer followed the conventional color code. If your home’s system of this vintage has provisions for air-conditioning (cooling), then the thermostat wiring will have at least three wires (some will require a separate ‘R’ terminal for heating and cooling and will be labeled ‘Rh’ and ‘Rc’ now needing a minimum of 4 … And now, the not so good news. The thin red wire … Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. This video is part of This Old House: Live—an initiative providing daily programming and opportunities to connect with our experts during these challenging times. The white wire connects to your heat. Question – I have five wires at the furnace. This category only includes cookies that ensures basic functionalities and security features of the website. The orange wire … You'll notice at the furnace, that the thin blue wire connects to the thin red wire. Not enough information. My existing thermostat has the typical 4 wires (R, G, Y, W) but the bundle in the wall has 5 unused wires The HVAC has the same 4 wires connected and the bundle at that point has the same unused wired. This commission helps us pay for the overhead of running this website. Connect the thermostat to the baseplate. Remove the fuse or trip the circuit breaker in the fuse box that supplies power to the thermostat and … 4 Wire or 5 Wire Thermostat Wiring Problem – Additional reader questions: UVC Light to Kill Viruses and Other Airborne Harmful Things that Affect Health. We use cookies and other tracking technologies to improve your browsing experience on our site, show personalized content and targeted ads, analyze site traffic, and understand where our audiences come from. You did not mention if you had any additional wires there in the thermostat bundle because with your new thermostat, you are going to need one extra wire. Upload a photo and more info……………..our uploader link is in the menu on the right. Red is the 24-volt hot wire which would power the relays or circuit boards for the air conditioner, the gas furnace, and the blower along with any accessories in the system controlled by the thermostat. In my HVAC there is no connection in Y terminal. 2 BLACK 2 RED.SHOULD I JOIN THE 2 BLACKS AND 2 REDS BEFORE CONNECTING TO HOUSE POWER? See the diagram below for what each wire controls on your system: S – Indoor and … Mechanical versus newer thermostats that are digital. This website uses cookies to improve your experience while you navigate through the website. Remove the wall screws holding up the thermostat before disconnecting the wiring to prevent the wires from falling into the wall. HAVE A 4 WIRE THERMOSTAT FOR A 2 WIRE OUTLET. These thermostats have 4 wires described as below: Red wire for 24-volt hot; White wire for heat; Green wire … Ross installed a Google Nest Thermostat E. The kit comes with the baseplate, thermostat, and required screws to secure it to the wall. We do not have a heat pump, so I planned to use the conventional wiring. I can only assume it is un-used for anything, at least this jumper you are talking about here. This goes to the 24 volt common side of the transoformer and is typically not used for mercusry type thermostat unless the thermostat requires power. Green. On the back plate, you will see a number of letters. We have both a natural gas furnace and an AC unit. This smart gadget permits you to control temperature via internet effortlessly. Click the image to the right for purchase options of the UV light to protect your family. Green – The green wire connects to the fan. You also have the option to opt-out of these cookies. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. Please help. The orange wire connects to terminal O on your thermostat. This is commonly found in … 6. The Honeywell YCT410B1000 Manual 4 Wire Premium Baseboard/Line Volt Thermostat is a simple to install thermostat that's compatible with 120, 240 and 227 vac baseboard systems. The two green wires at the thermostat are connected G-green, G-yellow. But my Ac compressor not kicking on. Most people don’t use the “fan only” mode, so while you’d give up control over the fan in the system, you’d gain constant power to the smart thermostat. Answer: Thanks for the email, Ed, and I’m glad to help. The guide covers four and five wire designs, so the only thing holding you back is whether the original installation is compatible. The green wire connects to the fan. Understanding where the wires go and what they do help you. On the HVAC, there is a 5th wire, which is white and connects to the C terminal. The cover is either held onto the back plate by snap clips or one or two small screws. Any suggestions on how to wire the new thermostat? My question is can I hook up one of the extra wires to the C terminal on the HVAC where the white wire is and then hook the other end to the C terminal on the thermostat? If there is a wire … We were given a new Honeywell VisionPRO Wi-FI Programmable Thermostat model TH8320WF and would like to install it. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. What do I need to do I thought blue was there c wire? 4 Wire or 5 Wire Thermostat Wiring Problem. This closes the 24-volt control side of the gas furnace and begins the process of starting the gas furnace into its sequence of operation. By choosing I Accept, you consent to our use of cookies and other tracking technologies. Wire the smart thermostat to the correct terminals. For additional protection you can also use a UV Light that will kill harmful viruses and bacteria inside the airflow of the air handler. Incompatible wiring (installing a new five wire thermostat to a four wire … The thin blue wire at the thermostat is connected to the Y terminal, which means it is used to call for cool (air conditioning). That means you need a 24-volt hot and a 24-volt common wire. The answer to the question depends on the type of system you have and what kind of thermostat you have for control. For the C wire you will need an additional wire. WE4M181 Dryer Cycling 4 Wire Thermostat for GE AP2044414 PS267926 Description -Laundry Combo Main Control Board Compatible Kenmore Ge Ap5789049,WE4M181,AP2044414 .PS267926.Ap5789049. This website uses cookies to improve your experience. White – The white wire is what connects to the (auxiliary) heat on your system. Note: On Rheem and Ruud heat pumps this wire may be a different color. The first thing we need to do is to identify the wires and where they go using our comprehensive guide to thermostat wire colors and codes. The above is a typical wiring diagram of a Nest Thermostat with 4 wires. R-wire - red wire (can also be RH or RC - read thermostat manufacturer instructions). But Heater works fine. After you have disconnected splice A (left side) or splice B (right side), proceed to the next step. b. It controls the reversing valve inside the heat pump condensing unit. These were the older mercury switch thermostats that were mechanical. The Orange Wire. For the new thermostat to work, you need a 24 volt common to complete the circuit with the 24-volt hot wire to provide power for the thermostat because it is a state of the art digital programmable wi-fi thermostat it will need 24-volt power to work. The yellow wire connects to your compressor. Variety of 4 wire thermostat wiring diagram. To learn more or opt-out, read our Cookie Policy. I have a four wire system! We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. It is mandatory to procure user consent prior to running these cookies on your website. The picture above depeicts the typical wiring color code for a 4 wire thermostat. Use electrical tape and cover the metal part with the tape. On the back of the thermostat are a number of labeled contacts, only the following have wires connecting them:W - white wireY - blue wireR - red wireG - green wireY wire jumpered to a contact labeled 1. air conditioner into its sequence of operation, understanding of basic control circuits in HVAC, Blank Display Problem – Screen Disappeared, Honeywell Heat Pump Thermostat Troubleshooting, How Can I Tell 1 or 2 Transformers for Heating Cooling System, How to Wire an Air Conditioner for Control – 5 Wires, HVAC Products Containing Mercury and Proper Disposal, Thermostat Wiring Instructions not Matching New, What Temperature Should I Set My Programmable To, Wiring a Programmable for Geothermal Heat Pump, How to Test a Thermocouple with a Multi-Meter, 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. 4 Wire or 5 Wire Thermostat Wiring Problem - The Answer W - white wire - this wire goes to the gas controls to engage the heat on a call for heat from the thermostat when you... Y - blue wire – This wire … The orange thermostat wire links to your heat pump, if you have one. a. Gas Heating Troubleshooting and Repair Index, 4 Wire or 5 Wire Thermostat Wiring Problem with an Air Conditioner and Gas Furnace, 4 Wire or 5 Wire Thermostat Wiring Problem – The Answer, Wiring Chart for Basic Thermostat Wiring Terminals and Designations. BASEBOARD WIRING WITH A DOUBLE POLE (4 WIRE) WALL THERMOSTAT - 120V OR 240V SUPPLY. Ross suggests taking a picture of the wiring configuration to keep track of which wire goes where. But opting out of some of these cookies may have an effect on your browsing experience. This manual thermostat's versatility is increased substantially with its implementation of a 2 or 4 wire … Just take the extra wire (if you have one) and attached it to the C terminal in the air handler and the other end of that same wire will go to the C terminal on the new thermostat. Copyright © 2020 This Old House Ventures, LLC. Necessary cookies are absolutely essential for the website to function properly. Your email address will not be published. It reveals the parts of the circuit as streamlined shapes, and the … Configure the thermostat following the manufacturer’s settings. Yes, it's a messy job. Orange – This wire … All rights reserved. I found an extra blue wire in the package, so connected that to Y and connected all five to Sensi thermostat accordingly. 4-wire thermostat wiring: This type of wiring is commonly found in battery operating thermostats or digital thermostats with only heating systems.