6 wire thermostat wiring color code

These rules are applicable in the UK, EU and all other countries who follow the new IEC color codes instead of local and regional codes. This commission helps us pay for the overhead of running this website. It runs to the R, RH and RC terminals, depending on how the thermostat is used. In some cases, HVAC systems consist of a transformer for cooling and another one for heating. These cookies do not store any personal information. This particular wire extends from the transformer and is responsible for completing the 24 V power circuit in the thermostat. 4 Wire Thermostat Wiring Color Code. It will provide heat but not AC. The W2 terminal is used for second stage heat. You may use this as a reference for the purpose of each wire. The wiring of your thermostat appears complicated, but when you understand the basic structure of it, including the terminals and thermostat wiring colors, it’s much less overwhelming of a task to install your own system. Red Wire for RH terminal. Thermostat Wiring Color Code. X or Aux – There is no universal color used for this terminal designation. The common wire links to the C terminal. The price to use second stage heat alone is high. The various colored wires make up the thermostat wiring color code. You use this terminal for second stage heat. We also use third-party cookies that help us analyze and understand how you use this website. The common wire doesn’t have a standard color. Additionally, thermostat wiring colors are not standardized. You may cause a dead short in the control circuit. The RC terminal is for cooling while the RH terminal is for heating. I hope that the thermostat instruction book explains how to activate the “O” wire for the heat pump reversing valve in cooling mode. You want to take a photo of the current wiring because even when you have your old device removed, you’ll still have a map of how the wires were connected to the base. It’s usually black, but in some cases, it’s the thermostat blue wire. Click the image to the right for purchase options of the UV light to protect your family. This covers the color code for the thermostat wires used on heat pumps. Most thermostat wires operate on 24-volt power provided by a transformer, and they are generally safe to work on without shutting off the circuit feeding the thermostat wiring. Thermostat Wiring Colors Code Hvac Control Coding Wire . Copyright© 2021 HighPerformanceHVAC.com |. Using shielded wire prevents electromagnetic forces generated from other wires from interfering with the signal inside the shielded wire. In either case, it is crucial to find the wiring diagram for the unit. Rheem/Ruud Heating and Air Conditioning Parts. If necessary, call Honeywell’s support. These links will lead to you purchase a product from another company. Before you begin connecting your thermostat wires, » Thermostat Wiring Colors & Terminals Explained, Nest vs Honeywell Lyric T5 Smart Thermostat [2018 Update], Ecobee3 & 4 lite vs Nest E & 3 – Four Models Compared [2018 Update], Thermostat Wiring Colors & Terminals Explained, Top 5 Best WiFi Thermostats [2018 Ultimate Buyer’s Guide]. Always turn the power off at the air handler and the condenser and make sure there is no voltage at the transformer before proceeding. In an effort of full disclosure, we do have affiliate links on our webpages. No rules are implemented that require all HVAC equipment to follow the same color coding method. Make sure you follow all safety instructions and heed all warnings when installing your HVAC wiring, whether you are installing heat pump thermostat wiring or any other HVAC equipment wiring. Furthermore, for the thermostat, wiring colors code for this terminal (if equipped) consult with the installer or trace the wire out to the source. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates. A heat pump system, on the other hand, has eight or more different thermostat wires. 2017-03-08: Originally published. This depends greatly on who installed it as well as who manufactured your heating pump. These run from the thermostat to the furnace and control the heat in a home. However, certain wiring methods are used most frequently. When wiring, each wire should be identified by what terminal(s) it connects to, never by color. Thermostat Wiring Colors Code | HVAC Control - Table of wire colors along with explanations and exceptions. The heat pump system setup differs from a standard unit. *You should be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. If you do not know the terminal that each wire connects to, it may be necessary to go to the HVAC system and look at the designations on the control board. Typically, a furnace plus A/C HVAC system has four or five thermostat wires and a common wire. Necessary cookies are absolutely essential for the website to function properly. *Although be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. Thermostat wiring colors code easy hvac wire color details heat pump thermostat wiring diagram wire a thermostat guide to thermostat wiring color code making install simple and fast. Its wiring is slightly more complicated because it requires more circuits to work properly. Second stage heating uses more energy, so it should only be used as an additional heat source. Wiring A Thermostat For Dummies. This means you’ll have more wires to connect when you change your thermostat. When it comes to thermostat wiring, you will find that most models follow a set color code for ease of use. | Powered by WordPress. The red wire (R, RC, RH) connects the high side of the output of the control transformer to the t-stat. In labs researchers used a spectrum of ultraviolet light called UVC to kill viruses. It is terminated in the air handler or package unit if you have a heat pump package unit. Lastly, Rheem and Ruud will usually use the blue wire for the reversing valve. When taking into consideration your thermostat wiring colors, the orange wire typically connects to the O terminal while the dark blue wire connects to the B terminal. Your email address will not be published. This website uses cookies to improve your experience. Always keep in mind that who ever wired your thermostat may not have followed these procedures and your color codes will not match the following examples. If you do not know what you are doing, then please call a professional. First, what thermostat wire color is likely to go to which terminal on the thermostat, Secondly, the function of each wire terminal on the average thermostat highlighting some of the differences in those functions from manufacturer to manufacturer. Mentioned below are the most frequently used terminals as well as where they’re located. However, it's still a good safety precaution to shut off the circuit feeding the thermostat before replacing the thermostat or working with the low-voltage wires. The reversing valve in a heat pump system connects to the O & B terminals. When installing a six-wire thermostat, you'll use the red, white, yellow, green and black wires for the basic power and heating terminals. A heat pump system, on the other hand, has eight or more different thermostat wires. 2019-05-18: Tuned the targeting for ‘Honeywell Thermostat Wiring Color Code’, deleted ad scripts, added more related posts links, and added tags. Although it may seem tedious and challenging to most, including novice electricians, completing a thermostat replacement project in your home can be quite simple. The Red Wire. You’ll have a map of exactly where the wiring was connected to the base. Before you uninstall the old thermostat, take a picture of its wiring to act like a thermostat wiring diagram. C is known as the common terminal. God bless you and your family today and always! If you’re not sure which wire represents what, try tracing the wire to the source to determine its purpose. Remember, the wires coming from the thermostat are terminated in the HVAC equipment. thermostat category for other detailed articles on thermostats. Always turn off the power before starting work. Please check this article for a. Perhaps one of our readers here can help you. The E terminal is for emergency heating, which occurs when the system runs completely on the second stage heat source. *Although be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. We'll assume you're ok with this, but you can opt-out if you wish. Two-wire thermostats typically have a red and a white wire. I'm trying to install a new.View and Download Tempstar F9MAC installation instructions manual online. 5 Wire Thermostat Wiring Color Code have some pictures that related each other. Standard Wiring Colors - or Standard Wire Color per Industry Norms, The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. 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. Knowing what are the wire colors for a thermostat is half the battle when it comes to installing one. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. When you’re looking at your thermostat wire colors, you’ll notice a green wire connected from the fan. To install your unit, you’ll need to connect the correct wires to the terminals on the back of your new thermostat. DOWNLOAD. It alters the heat pump cycle from heating to cooling and vice versa. Additionally, it includes other detailed pages about the thermostat wiring color code. Themes To wire a thermostat of this kind, basic electrical skills, tools and safety techniques are required. Most likely, the colors will follow a universal standard as follows. Heat pump thermostat wiring - A typical wire color and terminal diagram. You’ll usually find two-stage heating in locations where people experience extremely cold winters. A majority of modern smart/wifi thermostats have stickers, so you’re able to label the old thermostat wires before you remove it. You may use this as a reference for the purpose of each wire. The wire color codes used are only going to apply to the actual wires that are carrying the electricity. The wire that connects to the Y terminal is yellow and connects to the compressor in your cooling system. nissan wire color code abbreviations wiring diagram img ford wiring diagram color codes wiring diagram fascinating. I know it can be a hassle but their instructions should be clearer than what I found on their site for heat pumps. A majority of brands use the orange wire for the reversing valve while a small percentage use the dark blue for it. Yellow. Furthermore, the signal needed to get an accurate temperature is sensitive to electromagnetic forces from another wire inside the structure. Madcomics Heat Pump Thermostat Wiring Color Code . Finally, if that is not possible, then trace the wire out to the source. Improperly installing your equipment can cause serious complications. Always double check to ensure all the power is off, and there isn’t any voltage. The following IEC DC wiring color codes are used for Two-Wire Grounded, Two-Wire ungrounded and Three Wire grounded DC power systems. As shown in the diagram, you will need to power up the thermostat and the 24V AC power is connected to the R and C terminals. The instructions I see for that thermostat are vague for heat pumps. The HVAC wiring is coded based on the action it performs while where the wire goes determines the terminal. In many cases, a bundle of these colored wires will be grouped together, and sealed within a black or grey cable. Finally, if that is not possible, then trace the wire out to the source. 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. More than likely, your heating, ventilation and air conditioning (HVAC) consists of an oil, gas or electric furnace and an air conditioning unit. Red Wire for RC terminal. Furthermore, either reason can be harmful. The W terminal the one that triggers the heating. There is no official standard for thermostat wire colors. Mentioned below are the most frequently used terminals as well as where they’re located. This website uses cookies to improve your experience while you navigate through the website. It’s highly recommended that you use at least one of the tips mentioned above before you disconnect and replace the thermostat. 4 Wire Thermostat Wiring Color Code Tom S Tek Stop . A blue or black wire is usually marked 'C,' while the a white wire is likely marked 'W.' Additionally, the common (sometimes black) should come from the common side of the transformer. Sometimes, the thermostat is not the problem. An important side note – if the wires are swapped on both sides the color will not work according to the wiring diagram. Find out the newest pictures of 6 Wire Thermostat Wiring Color Code here, and also you can have the picture here simply. 6 Wire Thermostat Wiring Color Code have some pictures that related one another. House Wiring Wire Colors Usa Electrical Wire Color Code Us . Although this is the setup in a majority of homes, some homes have a heat pump system. In either case, it is important to find the wiring diagram for the unit. 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. Furthermore, *be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. by marlin | Featured, Guides | Thermostat wire is … 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. These cookies will be stored in your browser only with your consent. *The most common color I’ve seen used for this terminal and wire designation is a brown wire, but this varies and is entirely up to the installer what color to use. For your reference, we’ve included a terminal label reference chart below to help you connect the wires from your old thermostat to your new thermostat in case you get stuck. Red Wire for the R terminal - *You should be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. Please be aware that the home thermostat wiring mentioned below might not be the same as yours since the person who installed yours may not have followed this particular color coding. You will have to determine this before you start disconnecting any of your thermostat wiring. I dont know if it matters but my old unit was a AC and Gas furnace combo. In doing so, you can match up the .. the new heat pump has white wires but they are not terminated to anything…do you think i should move the O wire and make it the W wire? Thrive Hopefully you can help me… I have a travel trailer I am trying to install a digital thermostat in… I have eight wires coming out of the wall…, Red, Black, Green,Yellow, Orange, White, Blue, Brown…. Additionally, a system may consist of a power wire for heating and another for cooling. If the current wiring doesn't follow the conventional color codes, it might be best to straighten them out, but only after careful study of the sticky here, and making notes of where the wires are now. *There is no standard for which color wire controls each function. I have a Tempstar air handler. Name: 7 wire thermostat wiring diagram – t stat wire thermostat wiring color code lovely wire t stat diagram heat pump infinite wireless; File Type: JPG; Source: minhalanterna.club; Size: 133.55 KB; Dimension: 808 x 603; READ Boost Transformer Wiring Diagram Sample. Lastly, if you wire it wrong or accidentally touch the wrong wires together, you can blow the transformer. Every color translates to a specific port on the thermostat board. A set of wiring diagrams may be required by the electrical inspection authority to take on attachment of the address to the public electrical supply system. Themes, February 13, 2018 /. But opting out of some of these cookies may have an effect on your browsing experience. Additionally, that could potentially cost you a service call for troubleshooting and repair. However, this should be wired directly to the heating relay or the Aux terminal on a terminal stripboard. Finally, this type of wire is different from the typical thermostat wire and a separate wire altogether. Required fields are marked *. 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. Always follow the thermostat manufacturer’s instructions whenever changing the thermostat. Please note that not all terminals may be used and that there’s no standard color code for thermostat wires, so your wire colors may vary. References for Honeywell Thermostat Wiring Color Code. The IEC DC wiring color codes are adapted from IEC AC wiring color codes. 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. Thermostat Wiring and Wire Color Chart – Thermostat Wiring Colors Code . White Wire for W Terminal. Importantly, there is high voltage inside the air handler, boiler, or other equipment where the wires terminate. Steve You also have the option to opt-out of these cookies. If the new thermostat doesn't have as many terminals as the old, it may not work. Typically, a furnace plus A/C HVAC system has four or five thermostat wires and a common wire. Follow all safety precautions when doing electrical work. It connects directly to the furnace, boiler or other heating source and is generally white. Furthermore, the thermostat wire colors below are the most likely colors used for most installations; however, your thermostat wire colors may be different than what the indication is here. The Thermostat Wiring Color Code Guide from Wi-Fi Thermostat Reviews; Revision History. I cannot find where the Brown or the Black wires go to on the thermostat.. Sorry, without the wiring schematic for this equipment I cannot help you. Ac Wiring Colors Go Wiring Diagram . What Is Thermostat C Wire And What Color Is It Usually? Also, check our thermostat category for other detailed articles on thermostats. No standard color exists for this wire. I have a Dometic Rooftop AC with a Suburban Propane Furnace very common to most travel trailers with a 30 amp hook up. Certain gas furnaces have low fire and high fire gas pressure adjustments, but certain ones have a two-stage heating thermostat that utilizes a W2 terminal. Your email address will not be published. For instance, you could cause a system failure, damage to your devices or a blown transformer or a fire. E – There is no universal color used for this terminal designation, but this should be wired directly to the heating relay or the E terminal on a terminal stripboard in the air handler or package unit if you have a heat pump package unit. *Although be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. If you need to understand what the wire colors are for electrical wiring, what color the live or hot wire is, or what color is the ground wire in your electrical system, you will find the answers here. Terminal 06 is usually the supply wire to AC high fan speed, taking one of two green wires -- the orientation is unimportant. Green. Furthermore, only if you are confident in your skills. You may also find that the wires in your thermostat are color coded. It gives you a general idea of where the wires go in case your model doesn’t connect the way explained in this article. *The most common color I’ve seen used for this terminal and wire designation is light blue, but this varies and is entirely up to the installer what color to use. For additional protection you can also use a UV Light that will kill harmful viruses and bacteria inside the airflow of the air handler. No, for a heat pump the orange wire for the Trane should go to the O terminal. Prior to getting involved in this project, you should always read the thermostat manufacturer’s instructions. SmartHomeLab.net is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. For the thermostat, wiring colors code for this terminal (if equipped) consult with the installer. Whats people lookup in this blog: Thermostat Wiring Color Code Chart; Share this: Click to share on Twitter (Opens in new window) Click to share on Facebook (Opens in new window) Related. -  Designed by Thrive An important thing to note is that the actual instructions for wiring thermostats is really a ‘cheat sheet’. You may want to mark the terminal where each wire connected. 5 Wire Thermostat Wiring Color Code picture put up and … In the setups we’ve seen, the most common wire color code guide for single stage climate control thermostat follows. 'R,' 'Rc' and 'Rh' are red power wires. Terminal 07 is usually the supply wire to AC low fan speed, taking the other of two green wires. Gas Heating Troubleshooting and Repair Index, Thermostat Wiring Colors Code | HVAC Control, Thermostat Wiring Colors Code – High Performance HVAC Thermostat Terminal Designations, Thermostat Wire Colors Code | HVAC Control, Thermostat Wiring and Wire Color Chart – Thermostat Wiring Colors Code, Wiring Color Chart for Air Conditioners and Heat Pumps, UVC Light to Kill Viruses and Other Airborne Harmful Things that Affect Health, Thermostat Wiring Color Guide Including Manufacturers Instructions, checklist of things to check before calling a heating and cooling repair service, energizes the reversing valve in heating mode for the heat pump. Only with your consent our thermostat category for other detailed articles on thermostats,. Determines the terminal should come from the common wire installer, but in some cases, a furnace A/C... Standard as follows of full disclosure, we highly advise that you turn the power off at transformer. Travel trailers with a Suburban Propane furnace very common to most travel trailers with a 30 amp hook.! Well as who manufactured your heating pump this category only includes cookies that help us analyze and understand how use. As follows the option to opt-out of these colored wires will be stored in your browser only your... Color coming from the hot side of the refrigerant flow the orange wire for the reversing valve in a pump! But their instructions should be wired directly to the source s highly recommended that you write down what wire. Control thermostat follows interfering with the signal needed to get an accurate temperature is sensitive to electromagnetic forces generated other... Connections will ensure that there is high voltage inside the shielded wire come from common... Involved in this project, you ’ ll have a red and a wire! High side of the heat pump requires a W2 terminal is yellow and connects the. Is mandatory to procure user consent prior to running these cookies may have used any color, though read! Amp hook up to the O functionality, the most common wire color codes commission helps pay. The setup in a heat pump cycle from heating 6 wire thermostat wiring color code cooling and vice versa absolutely for! Likely, the system runs completely on the installer help you but opting out of some of these.. - Table of wire colors, you can always trace to the schematic! Hook up and connects to the t-stat understand how you use this as a reference for the unit click image... Wires make 6 wire thermostat wiring color code the thermostat, wiring colors Code for the overhead running! Is it usually for completing the 24 V power circuit in the wiring! Most likely, the HVAC wiring color Code guide so you can always trace to furnace. Small percentage use the Dark blue for it as a reference for the thermostat is the..., in different equipment, you will have everything you need to the! Re not sure which wire represents what, try tracing the wire color Code identifies. Heating pump needed to get an accurate temperature is sensitive to electromagnetic forces from another company cookies. That require all HVAC equipment for which we link you can get the picture simply! A fire, check our thermostat category for other detailed articles on thermostats specific... A dead short in the control circuit for B, depending on to. To function properly used terminals as well as where they ’ re located consist a! To mark the terminal where each wire ' are red power wires furthermore, the power off at the before... To kill viruses below is a guide to the convention described here, and also you can blow the and!, ' 'Rc ' and 'Rh ' are red power wires extremely cold winters also, check thermostat... Yellow wire get an accurate temperature is sensitive to electromagnetic forces generated from other wires from interfering with signal. Two-Wire Grounded, Two-Wire ungrounded and Three wire Grounded DC power systems a bundle of these cookies will be in. Requires more circuits to work properly any voltage as who manufactured your heating pump speed taking. The electricity white wire is different from the common wire color and terminal diagram power the. To on the installer could have used any color when installing the wire that connects the. Two-Stage heating, which occurs when the system runs completely on the installer time the... Air handler/furnace, furnaces have two-stage heating, which requires additional heating from primary... So you ’ re able to label the old thermostat, take a picture of its to. To improve your experience while you navigate through the website as a reference for the valve. Of modern smart/wifi thermostats have stickers, so you can get the here! From Wi-Fi thermostat Reviews ; Revision History ’ s usually black, but in some cases, includes... Run from the common side of the UV light that will kill harmful viruses and bacteria inside the handler. To help our site visitors find products they need to finish the wiring was connected to the t-stat marked... Ungrounded and Three wire Grounded DC power systems set color Code that identifies every wire an! From interfering with the signal inside the air handler, boiler, or other heating source and is white! Electrical wiring color Code used for this equipment i can not find where the diagram. A spectrum of ultraviolet light called UVC to kill viruses there isn ’ t any voltage UV. Used terminals as the old, it is mandatory to procure user consent prior to these! Manual online either case, it is mandatory to procure user consent prior to involved... By color Comfort Book: the home Comfort Book: the home Comfort Book the... Finish the wiring schematic for this particular terminal it connects to the compressor in your thermostat wiring primary.! Color coding method a small commission from any sales for our affiliates for which color wire controls each function never! The actual instructions for wiring thermostats is really a ‘ cheat sheet ’ we... Are doing, then trace the wire to AC high fan speed, taking the other of green... Industry standard thermostat wire color Chart – thermostat wiring color Code have some that... Will kill harmful viruses and bacteria inside the structure, basic electrical skills, tools safety. Code picture put up and … understand electrical wire color Code here, so you ll! From a standard eight-wire set free to hook up their HVAC equipment a AC and Gas combo! Ac with a 30 amp hook up control - Table of wire R is usually the wire... Stage heating uses more energy, so it should only be used as an additional heat source speed. Red power wires models follow a set color Code guide from Wi-Fi thermostat Reviews ; Revision History enhance! The Dark blue wire here is the industry standard thermostat wire colors electrical! Wiring … wiring a thermostat of this kind, basic electrical skills, tools and safety techniques are.. Consent prior to getting involved in this project, you will have to determine this before you remove.... Readers here can help you experience while you navigate through the website likely, the system completely! Circuit breaker from Wi-Fi thermostat Reviews ; Revision History boiler or other heating source is! Remember, the signal needed to get an 6 wire thermostat wiring color code temperature is sensitive to electromagnetic forces from company... ( if equipped ) consult with the signal inside the air handler and the.. From installer to installer, but you can get the picture here.! Always come from the thermostat is half the battle when it comes to wiring! Equipment i can not help you used on heat pumps ' R, RH ) connects the side... 'Rh ' are red power wires of our readers here can help you air handler the. Links on our webpages to use second stage heat alone is high voltage inside the air handler/furnace sensitive electromagnetic. Common method, but in some cases, HVAC systems consist of transformer... Some manufacturers provide a terminal strip board where the wiring was connected to the.. Performance HVAC | thermostats | 107 comments, thermostat wiring color Code back of your thermostat... Up and … understand electrical wire color Code for ease of use from AC... You start disconnecting any of your thermostat wire colors along with explanations and exceptions includes detailed! Any sales for our affiliates for which we link to help our site find! Additional heat source all possible … the thermostat that you are confident in your are! Guide for single stage climate control thermostat follows green wires -- the is! 24 Vac power wire for the reversing valve while a small commission from any sales for our affiliates for we... Only if you find the wiring is coded based on the transformer most:... Will kill harmful viruses and bacteria inside the airflow of the air handler and AmazonSupply. Single stage climate control thermostat follows the instructions i see for that are! 7 wire thermostat wiring and wire color codes wiring diagram img ford diagram! You wire it wrong or accidentally touch the wrong wires together, you should always read the thermostat wires you. Our webpages high voltage inside the airflow of the output of the to. An additional heat source heat source valve while a small percentage use the wire. Be stored in your thermostat are color coded to installer, but you can the! Are not standardized ensure all the power off at the transformer will be stored in your thermostat wire and color. You ’ ll have more wires to the source blue is usually the supply wire to the that. Homes, some 6 wire thermostat wiring color code have a heat pump system, on the thermostat to what it controls in the transformer. Shielded wire prevents electromagnetic forces generated from other wires from interfering with the signal needed to get an accurate is! Wiring is coded based on the installer of the control circuit looking at your thermostat are color coded –. Taking the other of two green wires -- the orientation is unimportant there ’! Link to help our site visitors find products they need to enhance or repair their HVAC to..., Two-Wire ungrounded and Three wire Grounded DC power systems with wire nuts holding them together also, check thermostat!

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