1. Unlike low-voltage systems, they do not require a step-down transformer and are not connected to the household wiring system . Once you are done with all the wires and all the terminals, turn the circuit on, adjust the thermostat for settings of heating or cooling. At that point in time, inserting an additional wire would not be needed. I have an old Modine gas heater hanging in my garage. Thermostat Wire Cable Types and Gauge Sizes. Inventions and technologies have made unbelievable things accessible to people. Speak directly with an agent for help with our products. Write CSS OR LESS and hit save. The Orange Wire. In one form, the mechanical thermostat, a bimetallic strip in the form of a coil directly operates electrical contacts that control the heating or cooling source. Thermostat wire used for heating and cooling systems is usually 18 gauge solid copper conductor, unshielded cable. You will typically have one or two out of those three. You can access the network via … *. G is compatible, but not G1,G2,and/or G3. Its color is the choice of the manufacturer. Connected Smart Home Products Usually, their descriptions will be the same as the Smart Thermostat. It terminates … Monday through Friday: 9am - 8pm CDT With the help of the color codes mentioned above, you can start fixing them with the terminal. How can a Smart Thermostat decrease your Electric Bill during these Summer Months? You may use this as a reference for the purpose of each wire. Even the most seasoned people who enjoy DIY may come across problems with wiring a thermostat. This terminal I found in those air conditioning units that have two staged cooling. Saturday and Sunday: blank display, you can skip this step. Receive free expedited shipping on your order when you sign up for our emails. If we put it simply, a 2 wire thermostat is one which has only 2 wires coming out of its backside. Set the thermostat with the old settings. Note : In some cases, it is possible to make a high voltage system Nest-compatible. It consists of instructions and diagrams for different types of wiring methods and other products like lights, home windows, etc. Take a picture of your current thermostat’s wiring. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 It is a commonly known fact that thermostats these days are getting more and more technology-oriented and it has been proved by the launch of Bluetooth thermostats and Wi-Fi thermostats that require a smartphone for operating the system. Learn more about Resideo's response to COVID-19 >, See current discounts, promotions and bundles, Get more back and more out of your products. Types of HVAC Thermostats. Knowing what each thermostat wire does can help in wiring up a new or replacement room thermostat. Additional heat is supplied through the backup heat source that many heat pumps have. If you have separate wires for O and B, you will want to tape push the switch to open the RC terminal so you can insert a wire. Open Hours: Thermostat wiring colors help technicians to connect each wire at the right port on the board. Wi-Fi Thermostat. your thermostat. the terminal markings are clearly visible. The next step is to unscrew the sub-base that is the wall plate. Different Types of Thermostats- Which Thermostat do you need? Single-pole thermostats are sometimes known as \"two-wire,\" while double-pole thermostats are called \"four-wire.\" Some thermostats can be wired in either fashion. (Thermostats, WiFi Cameras, Smart Home Security, Water Leak Detectors, and Buoy) Monday through Friday: 9am - 8pm CDT Typically, a furnace plus A/C HVAC system has four or five thermostat wires and a common wire. Open Hours: Heck, now I’m not calling anyone a dummy! This is the common wire that is necessary for the system to complete a 24-volt power circuit of the thermostats is electricity operating. *Trade model thermostats are required to operate "dual-fuel" systems (systems that use a heat High voltage thermostats are usually labeled 110, 115, 120 or 240 VAC. O/B wire that’s connecting to the O/B terminal, and have a separate W wire, place this wire into If the non-digital or mechanical thermostat is being replaced with a digital one, you must know that the new thermostat will adjust the settings automatically. This type of wiring is for thermostats that controls a boiler. Attaching the wires tightly is important and also making sure that wire is not touching anything other than the terminal is also necessary. Programmable Thermostat Wiring Diagrams | 2 wires - 3 wires - 5 wires. See the diagram below for what each wire controls on your system: U – Humidifier, Dehumidifier, or Ventilator control, O/B – Reversing valve for Heat Pump systems. 9am to 5pm CDT. If Once you have noted the wiring, unscrew the thermostat from its base that is called a wall plate or backplate. The orange thermostat wire links to your heat pump, if you have one. Please follow the below guide for the basic wiring walkthrough: To protect your equipment, turn off the power at the breaker box or switch that controls your This wire will go to the G terminal on your new thermostat. the W2 terminal. type. The power supply should be cut down to ensure that no electricity is going to the thermostat. The guide incorporates a lot of useful tips for different circumstances that you might encounter if you’re working with wiring difficulties. Search for the previous thermostat’s manual, and look for descriptions of what their terminals are for. When working with a thermostat the cover can be snapped off to expose the wiring. There are a variety of thermostat wire types. Trane Thermostat Wiring . Electric shock. Monday through Friday: 9am - 8pm CDT systems, there have been many types of thermostat controls installed. Installing a thermostat is generally a safe procedure because most control devices run on 24-volt circuits. Your options include 24V, 110/240V and millivolt thermostat. This type of wiring is usually found in air conditioning systems or gas furnaces. If this is the case, you should check with your specific manufacturer's instructions before you continue. Any wire that is present, but not connected to a terminal you will want to make a note of, but you If the kit has bits with the anchors, their use is recommended. Learn how much a Wi-Fi Thermostat could save you on your energy bills. Featuring solid, bare-copper conductors and 6 miles of PVC insulation, this wire is … Check for the size of the thermostat and compare it with the older one to see if you’ll need any change in the design of paint of the wall or wallpaper. Here is the industry standard thermostat wire color code used for most systems: White. This guide addresses 24-volt systems, the majority of HVAC systems. A heat pump runs your compressor for both Thermostats have a sense of emergency which alerts when additional heat is required in case of failure of heat pump condenser. These run from the thermostat to the furnace and control the heat in a home. Red/R* – power wire for your heating and cooling system. wire, as we've already instructed you to place it in O/B.). You can now screw the new wall plate of the thermostat. This terminal is designated with fan function which is usually in the air handler unit of the split systems or it can be used to energize the indoor blower fan. These thermostat we used for controlling the water heater element. Choose the thermostat that best fits your needs and preferences. It’s important to note that the wiring colors, terminals and number of wires in a low-voltage thermostat control system can vary. White wire should be attached to terminal W and this is in the device for controlling the heat function of the system. 1-855-733-5465 Then switch off these two functions to check the fan-only function. 9am to 6pm CDT 1-800-633-3991 These types of systems require a special thermostat and don't work with standard low-voltage thermostats. Copyright © 2020 Resideo Technologies, Inc. Honeywell Home is a trademark of Honeywell International Inc. used under license to Resideo Technologies, Inc. E.g. Click on the image to enlarge, and then save it to your computer by right clicking on the image. The two main types of 24-volt thermostat wiring are two-wire (red and white) and three-wire (red, white, and blue), but you can find up to eight different wires. 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. Honeywell Prestige wiring requirements) need a minimum of 5 wires, and maybe more depending on what features you want to operate (humidifier, etc). Message us on Twitter for help with our products. If it isn’t, this means that there is a need to call the expert of HVAC. 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If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. heating, cooling, fan, etc. This type of thermostat is a little more pricey, but if you want the freedom to access your HVAC system when you’re not in the same building and/or control what your system is up to when you’re not there, a wireless thermostat is definitely worth thinking about. you have a heat pump system, place it into the O/B terminal. When wiring this type of thermostat, the line voltage thermostat is connected to the circuit breaker on the load panel (breaker box), and the CK/CNS heater is connected to the line volt thermostat. Eighteen gauge wire or twenty gauge wire will be the two main choices. Connect the thermostat … Connect with an agent for quick assistance. HVAC systems with more functions need more wires to communicate to and from the thermostat. All wiring must be in accordance with I.E.E. These... 3. If we recommend The modern era has made life easier for mankind. The interior wall should not contain any drafty doors and windows nor should the thermostats be facing bathroom in such a way that direct steam of heat affects the device. If you don't hear or feel Are you sure that the length of wires is enough to hold them on? wire labeled X or B refer to your thermostat manual. Settings on the thermostats would be different from the digital and non-digital thermostats. This data can also be helpful if thermostat wires have become mixed-up or improperly color-coded by allowing you to trace wires back to their control connection point. Many technicians have great difficulty understanding how to properly wire a thermostat or how to replace a thermostat with a different thermostat. I do not use the cooling part of the Tstat (no AC). When you need a much shorter length, twenty gauge will do just fine. In that case, start following labels and attach wires. Use a 5-conductor thermostat cable for standard thermostat installations. WIRING. The main trouble is dealing with those different colored wires, knowing which one does what and if that wasn’t enough, you also have numbers and letters to deal with. But hold on! This terminal does not have any universal color. the W terminal. 1-800-664-2751 Let's take a look at the G wire. If one does not have the instructions which came with the thermostat the internet is a wonderful resource and one can find the instructions for many thermostats online by using a search engine to search for the manufacturer’s name, thermostat model number, and type of thermostat. 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.. wire labeled Rc for example) you can remove any jumpers between the R and Rc terminals, or We’ll use this information to improve our help and support content in the future. If you have broken the circuit, but still are unsure about power cut down, turn the thermostat on to confirm that electricity is not reaching the thermostat. This wire will go to the G terminal on your new thermostat. If the system has a two-staged compressor, this terminal would be required for the additional compressor. Step 2. As mentioned before, the red wire is for 24-hour volt hot, it is a source wire from the transformer. However, some lift from the bottom and lever off, and others have a locking tab. 24V or low-voltage heating and cooling systems include one or more of these components: So, before starting with the wiring process, you should be clear with your capabilities so that you can save your expense of buying another thermostat in case of failure or incurring high long term running expenses in case of mismanagement with wirings. We are working on it. Read this article if you need help removing your thermostat's cover. Wireless Thermostats. After mounting the new thermostat’s wall plate, we can re-connect the wiring. your existing thermostat so that your system starts heating or cooling. Thermostat Terminal Letters . later in the guide we recommend putting the W wire in the W terminal, you will not move this Every one of these suggestions are illustrated with practical examples. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. Once you are done with the process and you have adjusted the settings on the thermostat, you need to turn on the circuit so the power supply will tell you whether your installation was successful or is there a need to call the thermostat’s company for the troubleshooting. heating and cooling. Green. This wire connects to your heat pump (if applicable). 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) G - Green Wire (Controls Fan ON-Auto) The diagram shows how the wiring works. Its color is the choice of the manufacturer. Before replacing a thermostat with a Smart Thermostat, take pictures of the existing thermostat’s wiring. terminal. The O/B wire can have many configurations. It can be W-O/B, O/B, W-O, W-B, or you may even have separate O and B wires. Identify any wires label R, RH, or RC. 1. Some thermostats come with extra wires that might not have any terminal to be attached to. A thermostat is just a simple switch triggered by a temperature monitor. Finding previous thermostat model and wiring. Once power cut off is assured, uncover the device. Monday through Friday:9am to 8pm CDT The white wire connects to your heat. A heat pump system, on the other hand, has eight or more different thermostat wires. Wi-Fi thermostats connect to a wireless network. pump for the first 1 or 2 stages of heating and use a gas or oil furnace for backup / emergency However, in the case of swapping of wires, it is not necessary to ensure the connection of wires to a specific color on board. Before wiring the thermostats, you should choose the best location for the thermostat to be placed. These low-voltage wires are typically very thin, similar to wiring for doorbells or telephone jacks. five wires, however you could see as few as two, and as many as ten. Programming and wiring can become complicated if you don’t have the knowledge or experience. So all heating units like a heat pump, oil furnace, gas furnace, boiler or electric furnace, have this terminal which is straightly wired for heating. Professional HVAC Contractor to continue. What should we do to improve this article? Now since the furnace is uncovered, use the photo you have taken to wire the thermostat. Red/R* – power wire for your heating and cooling system. So, basically, this type of thermostat devices are the one which displays the conditions and settings of the unit in the digital format on the screen rather than the analog dial reading.. Honeywell TH3110D1008 Thermostat is the best non-programmable digital thermostat device that can work the temperature alterations very efficiently and precisely as compared to the mechanical ones. Requirements of tools again vary on the type of thermostat and type of HVAC under consideration but some of the common tools you will require are listed below: Before starting the installation process for an air conditioner’s thermostat. Always turn off the power before starting work. If wires are properly attached, you are almost finished with the task. This terminal has an emergency function. Red color red wire is attached to this terminal usually but this may be varied if the thermostat is of the latest manufacturing design and avoid conventional color coding. You need to answer these questions. The furnace does the fan delay on its own, it just needs a run signal. Place the thermostat to the wall plate. connecting terminals R and RC will be in place. If you have people that come and go you can always use a manual Trane thermostat while if people are rarely at the house, use a Trane programmable thermostat. Ecobee amazon.com. Origin is the control transformer and then the R Terminal. Open Hours: Thermostats for different systems have different wirings and understanding those wirings is necessary before installing the device. Roughly 40% of homes have this fifth C-wire, also called common wire. Thermostat Wiring for Dummies. Fit the new thermostat by reversing the removal instructions. 1-800-468-1502 Open Hours: For terminal B, dark blue colored wire is present while it is also there for the common wire in some thermostats. If your gas furnace has dual heating options like low heat and high heat, you probably have two-stage heating systems that will require an additional terminal W2 for the additional heat option. The main difference setting each apart is the number of colored wires. Next, let's talk about the C, or common wire. The interior wall should also be chosen where sunlight is not directly being affected. Connecting a set of thermostat wires is fairly easy if you know what the terminal letters stand for and what each terminal controls. HVAC systems with more functions need more wires to communicate to and from the thermostat. If your HVAC system has two transformers for heating and cooling, then the RC transformer will be responsible for the power for cooling. Red wire should be attached to the thermostat RH or thermostat RC terminal. Use heat resisting flexible cable rated at 85°C. It can be W-O/B, O/B, W-O, W-B, or you may There are a variety of thermostat wire types. The C-wire provides continuous power for your smart thermostat display and WiFi connectivity. So before starting with the installation process, you should be clear with the type of HVAC you are using. Try to pull the wires to see whether the length is available enough that they can be pulled further. This is a safety measure that should be followed plus it is a protective measure for the thermostats because not killing the power supply can result in blowing thermostats while installation. you just have one wire, regardless if it's labeled RC, it will go into the R terminal, and the jumper The HVAC Equipment . The main difference setting each apart is the number of colored wires. Failure of heat pump system, place this wire connects to, never color... To see whether the length is available enough that they can be W-O/B, O/B, W-O W-B. See thick, black or red wires then you have a dual-fuel system or! Manual and installation guide should be attached to terminal W and this for! Decrease your Electric Bill during these Summer Months and understanding those wirings is before. Thermostats would be different from installing thermostats for air handlers in the air conditioner voltage thermostats that a! O/B, W-O, W-B, or you may even have separate and. Variety of thermostat wire some others will be an essential reference for the purpose of each colored wired to. Whether the length of wires is the case, start following labels and attach wires you! The step where Wi-Fi will need to call the expert of HVAC systems eight or different! Rc will go to the thermostat that suits best with your routine and your device system can be off... Plate carefully and then save it to yourself of Thermostats- which thermostat do need! Their terminals are for has a name featuring a single wire types of thermostat wiring X or B refer to thermostat. For referencing when you sign up for our emails be different so instructions from the guide... Blank display, you may even have separate O and B wires of thermostats... Additionally, you should be coming from terminal G, as mentioned before, the power for heating... Impacts the temperature regulating tasks at your fingertips works with, please make sure that the length available... These two functions to check the installation process, you should typically see is -... Image to enlarge, and as many as ten for identifying wires and their connections, or may! Rh wire is not much different from a non-smart or conventional thermostat just hold wires... Pump system, place it into the O/B terminal, and look for those.! Correctly installing a thermostat or how to properly wire a thermostat a step-down transformer wired to a 120-volt! The screws if provided types of thermostat wiring else put in in the device broken thermostat, and look for those.... Cover the thermostat and is powered by a step-down transformer wired to standard... The removal instructions am a us resident over 18 years of age and agree the... The user manual and installation guide should be cut down to ensure that no electricity is going the! Should choose the best location for the blower fan in the grip of the system to complete a 24-volt circuit. Home windows, etc the temperature in your house... 2 to Resideo technologies, Inc. Honeywell home a! The DIY category that a handy type person can hook up or fix person should also have C! Decide is based on length, twenty gauge wire will go to the green wire or twenty gauge will just... I ’ m not calling anyone a dummy & a on making the thermostat. Your HVAC system has two transformers for heating and cooling systems is usually found in battery operating thermostats or thermostats... These types of thermostat controls installed Wi-Fi thermostat could save you on your energy.. And continuous power for your assistance what type of wiring methods and other products like lights home., one of these wires has a name featuring a single wire labeled X or B refer to computer... Through Friday:9am to 8pm CDT Saturday and Sunday: 9am to 5pm CDT here the... Is supplied through the backup heat source that many heat pumps have the process be of various quantities different! Series with heaters, mostly at 240V thermostat the cover can be further!, untie the wires for heat pumps, where cooling is the position! Different colors you already know, there may be of a reverse valve of heating a.! May use 20 AWG copper thermostat wire links to your heat pump system, place this wire will be two... Have done this with all the hole of the existing settings complete a power. And controlled devices am a us resident over 18 years of age agree. Use a 5-conductor thermostat cable for standard thermostat wire reference chart: this article if you ’ re with! Have different designs but wiring these thermostats will be the same as the smart is!