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Rc wires connect to the RC terminals on your thermostat. © 2021 Dwyer Franchising, LLC All rights reserved. If you observe the terminals, you can see two wires are tapped from ‘C’ terminal. Here is the industry standard thermostat wire color code used for most systems: White. Wall plate for a 4 wire smart thermostat installation. These colors are used as follows: You can see that there are two wires going into the thermostat. My question is about an unused brown-colored wire tucked back into the wall. I have 2 black wires to an older Honeywell thermostat. Most modern wifi thermostats have a straight connection, however some still require a small hook shape to be formed on the end. It is a red wire and comes from the transformer usually located in the air handler for split systems, but you may find the transformer in the condensing unit. The below is a rough guide for AC thermostat wiring. The 5 universal base colors for thermostat wires which are, in order of frequency of use, red, white, green, yellow, and black. The Rh wire, another type of red wire, is also responsible for 24-hour volt power from your transformer. This wire connects to your heat pump (if applicable). For full wiring assistance/terminal designations/functions: Click here How do I check if my thermostat is using a C-Wire? The Rh wire connects to the RH terminal on your thermostat. The green wire underneath your thermostat connects to the fan of your furnace or air handler. … The yellow wire connects to your compressor. Blue wires are also called “C” wires because they are the Common wire. This depends greatly on who installed it as well as who manufactured your heating pump. The main difference between the four and five is the common wire, which can only be found in the five setup. With the common wire, you get a piece that provides power from the transformer. For simple heating applications, a 2 conductor wire is sufficient. The ‘white’ color wire is part of the set that goes to the condenser unit. Ask Your Own HVAC Question. When you set a thermostat to emergency heat, the system bypasses the compressor and directly accesses the electric heat strip. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type. The following picture shows the inside of a thermostat. Because many thermostats come with a pre-installed thermostat jumper wire that connects these terminals, you only need one red wire, which could be the thermostat Rc wire or the Rh wire. The yellow wires terminate at your compressor contactor via an air handler. The Rc wire connects to the cooling system. The common wire, sometimes referred to as the c-wire… To wire a thermostat, you must first be aware of the type of system that you have in your home. C-Wires are required on most Honeywell Wi-Fi thermostats, with the exception of the Smart Round Thermostat (formerly known as the Lyric Round). (Haven't tested air-conditioning on account of the deep freeze here in Minnesota, but I'm assuming that's OK). Only after you’ve done this, disconnect the thermostat for replacing. The red wire is connected to terminals beginning with the letter R, which include R, RH, and RC units, depending upon how the thermostat is being used. What color wire goes where on a thermostat? Red – R– 24VAC power from the furnace’s transformer Aire Serv can help homeowners with all thermostat and HVAC needs. Green. The O/B wire can have many configurations. If you need help installing your new thermostat, Aire Serv® is here to help you get it right. I’ve found the best place to purchase thermostat wire is Amazon. The yellow wires connect to the Y terminals on your thermostat. Thermostat wire reference chart: this article explains just what wire at a room thermostat actually controls. No labels or colors of any kind. Knowing what each thermostat wire does can help in wiring up a new or replacement room thermostat. Help me identify which wires go where in my Nest Thermostat? Color codes for 24V thermostat wires are divided into two groups: - we give a summary tables of both traditional and current thermostat wire color code keys above. Not sure which wire goes to R and which to W on new thermostat. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. What Color Wire Goes Where On A Thermostat? But what if you have a system that's a little different like a Heat Pump System, Then your thermostat … A thermostat wire uses low voltage signals to transfer data. Thereof, what color wire goes where on a thermostat? You use this … G wire (green, for a fan). Customer reply replied 6 years ago. C wire (blue or black, common for 24-volt power to the thermostat). The Rh wire connects to your heating system as opposed to your cooling system. Enables continuous power flow from the Red wire. RED, RED[c], RED[h] is 24VAC where c stands for cool and h stands for Heat. For shorter runs use 20 gauge. Also asked, what color wire goes where on a thermostat? Click to see full answer. Red – Now, there can be two separate wires for this. The most common is 18/5 (5 strand, 18 gauge). Call (855) 679-0011 or request an appointment online to get started. These wires only connect to your cooling system. Nest Thermostats, Computer or Web Browser, Google Nest Device. W wire (white, for heat). It can be W-O/B, O/B, W-O, W-B, or you may even have separate O and B wires. This wire will go to the G terminal on your new thermostat. Red – R – 24VAC power from the furnace's transformer. Designed by Elegant Themes | Powered by WordPress. 34 answer What color wires go where on a thermostat? The system will not operate correctly if the wires are incorrectly connected. Multi-stage systems can require up to 8 conductors because of the amount of communication needed between the thermostat and air handler or furnace. Some have … Thermostat Wiring and Wire Color Chart – Thermostat Wiring Colors Code; Tstat Terminal Designation: Color of Wire and Termination: R – The R terminal is the power. Here are common uses for wire colors: Blue or Black – C – Common wire, may be unused by your existing thermostat. ( see the picture above). And, in heat pump systems, the white wire starts the compressor in heating mode. This thermostat wire color code will help homeowners understand the anatomy of their thermostat: Make sure you know what’s happening underneath your thermostat! This one uses the green … Learn More About Aire Serv Indoor Air Quality Services, determine that your heat pump is compatible with your thermostat, Red or “Rc” wires: Industry standard for geothermal heat pumps, Rh wires: Industry standard for geothermal heat pumps. The white wire connects to your heat. If the wire in the O/B-W connector is orange: you probably have a heat pump. Blue wires are for heat pumps, like orange wires. There are many types of thermostats available today. 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. Brown wire is used for heating elements while white wire is used for cooling elements. While thermostat wire colors can vary, you can also sometimes use color as a guide if a wire is in your thermostat’s O/B - W terminal. Yellow – The yellow wire connects to your compressor. Orange wire and Blue wire are usually a reversing valve. The thermostat wire is color coded so the technician can identity which wire goes to which port on each board. The thermostat's working fine, and I'm able to control it remotely. It’s important to note that in some cases the color of the wire does not necessarily mean it connects to that came color one the board. These two wires are called brown wire and white wire. The green wire underneath your thermostat connects to the fan of your furnace or air handler. If the wire in the O/B-W connector is white: you probably have a conventional system. This setup has been working, but I'm not even sure it's exactly right as I just had a contractor mess with it and install this temporary thermostat last week. W or W1 White (Heat Stage 1) , W2 [color can vary] (Heat Stage 2) Y or Y1 Yellow (Cool Stage 1), Y2 [color can vary] (Cool Stage 2) This wire may be red without an “H” attached to it, depending on if you have a dual transformer setup. 18 gauge thermostat wire is recommended for any distances up to 250 feet. Most thermostats have a red cable that is the power cable that usually connects to the RC terminals of the thermostat, a green cable that energizes the relay of the fan, connected to the G terminal of the thermostat, a yellow cable that energizes the contactor of the external units (if it has air conditioning) and a white cable that. Colors vary by the brand, but brown, blue and purple are the most common. There’s a lot to keep track of when it comes to thermostat wires! Orange. It terminates at the air handler or furnace. 94 answer What is the difference between CAT 5 and CAT 6 cable? Read reviews and find the best prices on Amazon.com. 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