This is a resistor which allows electrical resistance changes with temperature. Wait for any cooling or heating to stop, then turn off your furnace/AC breaker. The thermostat wire that you want to run from the air handler to the heat pump is typically going to be 1816 or 18:8 water. a high level for extremely hot or cold days, and a low level for mild days). Shop thermostat wire and a variety of electrical products online at Lowes.com. The chart below assumes12VDC(+) is supplied to thermostat Red wire … White – The white wire is what connects to the (auxiliary) heat on your system. 1 Heat / 1 Cool Thermostat. I accidentally cut the thermostat wire that leads from the inside of my house, to the AC unit outside. You might have a brown wire if you have a heat pump. Here is a quick guide on how to wire a different thermostat to the Furrion Chill AC. ". However, the C wire doesn’t provide the actual source of power to the thermostat. A thermostat is wired to a furnace or air conditioner unit and acts as a switch to turn the unit on and off automatically, based on the thermostat's temperature setting and/or programmed time schedule. The C wire, a.k.a. The orange wire connects to terminal O on your thermostat. Only air-source heat pumps connect to your outdoor condenser. They control your air conditioning system. Types of Thermostat Wire. The yellow wires terminate at your compressor contactor via an air handler. This guide will explain how to wire a thermostat in your home. The yellow wires connect to the Y terminals on your thermostat. The most common is 18/5 (5 strand, 18 gauge). (Air conditioner) Thermostat wire comes in various weights. Example of No Common Wire Thermostat. This thermostat wire color code will help homeowners understand the anatomy of their thermostat: Make sure you know what’s happening underneath your thermostat! Both heat-only and RedLINK thermostat systems have only two wires, typically R and W for heat only systems. (24 v AC from the control board) Rc: Power for cooling Rh: Power for heating C terminal will use the blue or black wire (Common wire, It enables the continuous flow of 24 v AC from the Red wire.) The Thermostat we used for this project is one that can work on just batteries so it doesn’t need power from the AC unit or RV to work like this one. Each of these wires has a name featuring a single letter (listed below). With today’s programmable thermostats and Wi-Fi thermostats, wiring your own system has never been easier. A wiring diagram is a streamlined conventional pictorial representation of an electrical circuit. The best way to make sure is to check the letter on the thermostat terminal to which each wire is attached. Blue wires are also called “C” wires because they are the Common wire. The temperature controller built into the AC unit itself is pre-installed by the manufacturer and requires no user wiring. It terminates at your air handler or furnace. Note that colors may vary and the labeling on systems may be inconsistent. roof top air conditioner and any furnace with a 12 VDC control circuit. There are a variety of thermostat wire types. It terminates at the air handler or furnace. HVAC systems with more functions need more wires to communicate to and from the thermostat. The unit could be furnace, oil or gas furnace, boiler or electric furnace. They control your air conditioning system. Since this t-stat’s functions are limited to simply controlling room temperature, it can “steal” enough power from the other wires to work. The other most likely is for the air conditioner (Rc). The green wire underneath your thermostat connects to the fan of your furnace or air handler. Use our tool to determine which thermostats work with your home’s existing wiring. Thermostat wire comes in many different varieties. ", Step 3: If this wire becomes damaged, you will need to replace the entire length of wire. a high level for extremely hot or cold days, and a low level for mild days). Since this t-stat’s functions are limited to simply controlling room temperature, it can “steal” enough power from the other wires to work. Look for the Common Wire Red/Rh – if you don’t have an Rc wire (described below), the Rh wire is the power wire for both – heating and cooling systems. Products 12 - These are links to wiring diagrams for Coleman Mach Rooftop units Changing to The Coleman Mach Air Conditioner With 5 Thermostat Wires Available Wiring Diagram For A, A Zone Control Box Kits. If you want to control the AC device, humidifiers, fan, you need more wires. Install the New Thermostat The next t-stat, the Honeywell T87N1026 big dial model, needs no common wire. Green – The green wire connects to the fan. Once your c-wire is ready, follow these steps to install your new thermostat. In case, you need to change one of those wires out. To install your unit, you’ll need to connect the correct wires to the terminals on the back of your new thermostat. W2 – (Commonly brown wire) This wire is for second stage heating. For programmable thermostats and smart thermostats, c-wires are essential for setting a schedule or having your heat or air conditioner turn on at a desired temperature. This wire is also known as the RH wire. As like in prevois wiring diagrams, The upper thermostat is connected to the single phase 240V AC supply through a 30 amp circuit breaker.The Line (L 1) as hot wire is connected to to the thermostat right terminal L 3. The unit could be furnace, oil or gas furnace, boiler or electric furnace. The yellow wires terminate at your compressor contactor via an air handler. 1. The orange thermostat wire links to your heat pump, if you have one. The green wire underneath your thermostat connects to the fan of your furnace or air handler. Y1 and Y2 wires might be used instead if you have a two-stage system (i.e. That is common. Air Handler, AC, and Boiler, Rc and R jumper removed . If you have two separate red wires, then one (Rh) is for the furnace. Learn Your Wiring Y-Wire - connects to the Y terminal and is for cooling stage 1. Click here for our precautionary measures. Understanding thermostat wiring colors is the next step. Thermostat wire comes in many different varieties. Again, no blue wire here. (It’s important to determine that your heat pump is compatible with your thermostatLink opens in a new tab before you decide.). These are Installing the on my RV with propane furnace and AC. It connects to the pink wire, which leads to the bottom wire in the mercury switch. These screws and connections are called terminals, and are the points at which electric wires from your AC unit are joined to the thermostat. These two connections will ensure that there is power to the thermostat that you are operating. Thermostat wire is just a big spool of bundled, color-coded wires. Variety of 4 wire thermostat wiring diagram. If your HVAC system doesn't have a C wire… That is common. The green wire underneath your thermostat connects to the fan of your furnace or air handler. If the air conditioning thermostat has one transformer to power both the heating and cooling system, then the wire from the transformer goes directly to the RC terminal and is called the RC wire. Many older thermostats did not need c-wires, but they were available for use. The yellow wires terminate at your compressor contactor via an air handler. How to install your Nest thermostat If you see a wire connected to your current thermostat’s W3 terminal, we recommend booking a pro near you to install your ecobee. Here’s how to determine if you have a c-wire thermostat: Turn your thermostat to the off position. Your AC compressor needs two wires - Y and C. Y comes from the thermostat and C comes from the air handler or the common side of the 24vac transformer. W2 – (Commonly brown wire) This wire is for second stage heating. These wires only connect to your cooling system. I've read that I might have blown the Step Down Transformer but I don't know where that is located to replace it. Two-wire thermostat is the easiest set up for the heating system, and it’s only ability is to heat the space, it’s not able to cool it down. W – (White wire) this is the AC thermostat wire from heating unit. the "common wire", allows a constant flow of 24 VAC (volts AC) power to a smart thermostat. It can from the R terminal. ecobee thermostats do not support three stages of cooling. How Thermostats Work . RC-Wire - connects to the RC terminal. Once you understand the wiring needs of the thermostat, it is a … The Red to white switch turns on the heat. Blue wires are for heat pumps, like orange wires. At the thermostat we had the the blue common wire connected to the RC terminal and left the jumper to R. We connected the Furnace Wire to W the Compressor wire to Y and the fan wire from the switch to the G terminal. You may find that a c-wire connection and lead is present. The orange wire only applies to homeowners with an air-source heat pump. © 2000-2020 Home Depot Product Authority, LLC. How to Check if You Have a ‘C’ Wire The trouble is, the c-wire is not that common in many (older) homes, as a traditional thermostat didn’t require much power. 240V AC Non-Simultaneous Dual Element 5kW Water Heater Thermostat Wiring. While some units can run without a c-wire, even brands like Nest recommend having one for optimal function. In this wiring diagram, you will see that and you will use only 5 wires. Check your furnace to see if you have one. What thermostat wire labels mean. Homeowners with geothermal heat pumps have no use for the orange wire. The first thing that you need to learn is how your thermostat works. If you have heat and AC, you’ll need 18/5. The white wire underneath your thermostat connects to your heating system. Call (855) 679-0011 or request an appointment online to get started. So the G wire here does control the HVAC fan. Digital thermostats use a simple device called a thermistor to measure temperature. The W wire goes to W terminal on the subbase of air conditioning thermostats. https://amzn.to/2KQ7OSK We replace the batteries every year and half with full time use. It terminates in your outdoor condenser for reversing valve operation from hot to cold. Y wire (yellow, for air conditioning). Please call us at: 1-800-HOME-DEPOT (1-800-466-3337), Please enter in your email address in the following format: you@domain.com. So the G wire here does control the HVAC fan. Explaining to home owners or do-it-yourselfer's about thermostat wiring. The thermostat should automatically complete these connections when a set temperature is reached. The color of wire R is usually RED and C is BLACK. When the Red wire is disconnected from W the furnace should turn off. C wires or varying colors apply to every thermostat, but blue C wires belong to thermostats attached to a heat pump. Example of No Common Wire Thermostat. If the air conditioning thermostat has one transformer to power both the heating and cooling system, then the wire from the transformer goes directly to the RC terminal and is called the RC wire. The most common is 18/5 (5 strand, 18 gauge). The Green Wire. If you have one, that’s your c-wire and you’re ready for general installation. Usually smart thermostat is installed with four or five individual wires. Use of this site is subject to certain Terms Of Use. Red wire should be attached to the thermostat RH or thermostat RC terminal. The yellow wires underneath your thermostat connect to your compressor. process of correctly diagnosing a Coleman Mach series rooftop air conditioner with a remote wall thermostat control VI WIRING DIAGRAMS. The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. Tighten any loose screw terminals. Red-Wire - connects to the R terminal. Red wires, specifically Rc wires, are responsible for 24-hour volt AC power from your transformer. Air Handler, AC separated from Furnace, Rc and R jumper removed . The temperature controller built into the AC unit itself is pre-installed by the manufacturer and requires no user wiring. If you need help installing your new thermostat, Aire Serv® is here to help you get it right. Featuring solid, bare-copper conductors and 6 miles of PVC insulation, this wire is … An important thing to note is that the actual instructions for wiring thermostats is really a ‘cheat sheet’. ... 1 Heat / 1 Cool Thermostat. Red/R* – power wire for your heating and cooling system. These connections themselves control power within the unit, for example the RC terminal takes power from the air conditioner's transformer, and sends the current to another terminal. That is for most air conditioning and heating systems. installing the. The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system. Again, no blue wire here. That is for most air conditioning and heating systems. This connects to wire in a switch, and depending upon whether the switch is on or off, the wire sends a r… The common wire, sometimes referred to as the c-wire, is what’s responsible for delivering constant power to your thermostat. Alternately, look for thermostats that specifically say they do not require a c-wire for operation. However, choosing a model that doesn’t need a c-wire will limit your choices and overall functionality. RH-Wire - connects to RH terminal. All Rights Reserved. Effectively there isn't a second RH wire, although there is an RH terminal. Aire Serv can help homeowners with all thermostat and HVAC needs. C wire (blue or black, common for 24-volt power to the thermostat). The main difference setting each apart is the number of colored wires. C = This is the common wire from one side of the transformer which is 24 Volts AC. This means that you do have a c-wire, you just need to find the end of the lead near your thermostat. Wiring an AC thermostat becomes … This wire may be red without an “H” attached to it, depending on if you have a dual transformer setup. Make it a point to print out the color guidelines and you will have everything you need to finish the wiring. Y2-Wire - … Remove the wire from the “W” terminal screw and the wire from the “R” or “Rh” terminal screw. Check out multiple thermostat wiring diagrams as well as in depth video explanations on accurately wiring thermostats for various types of HVAC systems! Need Help? They control your air conditioning system. The green wire connects to terminal G on your thermostat. Usually any red wire is bringing standard power to the thermostat. Thus modern thermostats require a continuous power supply and the C wire or Common wire is required for most thermostats to ensure 24 volts AC supply continuously. Orange – This wire connects to your heat pump (if you have one). Heat-only and REDLINK thermostats with only 2 wires are not directly compatible with wi-fi thermostat replacements or C Wire Adapters. T5+ Smart Thermostat with C-Wire Adapter Wi-Fi Color Touchscreen Thermostat SIGN UP FOR THE LATEST DEALS & OFFERS. The W wire goes to W terminal on the subbase of air conditioning thermostats. Then, reset the thermostat to its desired setting. C is known as the common terminal. Accordingly, what do thermostat wire colors mean? Red to Green turns on the fan, Red to Yellow turns on the air conditioner. Inside the air conditioner thermostat, there are a number of metal screws on connections. Electricity is delivered to the stat through transformers, and this is used to power different relays, which control energy traveling to the heating or the AC unit.Power from an AC thermostat travels into the unit, and this signals to the air conditioner that it should start working. R terminal will use the red wire. If the colors of the wires do not match the colors described here, make sure you mark the wires with masking tape. Y1 and Y2 wires might be used instead if you have a two-stage system (i.e. RC - Red Wire (Power 24 Vac) RH or 4 - Red Wire Jumpered (Power 24 Vac) Tip: For non-programmable thermostats, see your handy installation guide. So if you are an 18-6 wire and you are going to have an additional wire to be safe for the future. Thermostat Terminals. Rh stands for Red-Heat and Rc stands for Red-Cool. However, it still requires a thorough setup. Y, Y1, Y2: Whenever your thermostat calls for cooling, the Y wire is used to send a signal to your HVAC system telling it to fire up the air conditioner. Other models, like the Nest Learning Thermostat and the Honeywell Lyric can use a C wire, but they don't require it. The white wire connects to terminal W in industry-standard thermostats. The purpose of a C wire is to ensure continuous flow of 24 volts AC power supply to the thermostat. Likewise, people ask, what thermostat wires mean? Your health and safety are our highest priority during this time. 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 switch receives the High and low on opposite sides and the center terminal is what is connected to the thermostat. Read on for information about all possible thermostat wires. Go to the following article for step-by-step installation instructions. R = Power 24 Volts AC (This is the hot side of the transformer) 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. Dual transformer systems refer to a setup with a cooling and heating transformer. The 2 wire thermostat for line voltage systems are technically known as single pole thermostat (and the 4 wire version is known as double pole thermostat). The basic Heat + A/C System thermostat typically utilizes only 5 terminals. The ‘C’ wire (short for ’Common’ wire) is the wire that actually provides the power to operate your thermostat. Find thermostat wire at Lowe's today. Check the area behind the thermostat to see if a c-wire was tucked into the wall by your electrician or the installer. If you have wires sticking out of the wall but no thermostat, check the colors of the wires attached to the terminals on the control panel of your heating/cooling unit. Alternative Thermostat wiring for Furrion Chill RV AC. The yellow wires connect to the Y terminals on your thermostat. The Rh wire connects to the RH terminal on your thermostat. A 2 wire thermostat can not be used for hvac systems with … Here’s how to determine if you have a c-wire thermostat: If you can’t find the c-wire or need help with the difference between a 2-wire thermostat and a 4-wire thermostat, call a professional electrician. 1. A thermostat wire that runs between the air conditioner unit and the furnace can become damaged quite easily, since it usually is exposed along the refrigeration lines that run between the evaporator coil above the furnace and the air conditioner unit. The “18” refers to the gauge and the “5” refers to how many individual wires are inside the cable. Yellow – The yellow wire connects to your compressor. Wait for any cooling or heating to stop, then turn off your furnace/AC breaker. Detach your current thermostat from the wall. If the colors of the wires do not match the colors described here, make sure you mark the wires with masking tape. Beside above, what is RC and RH on a thermostat? HVAC systems with more functions need more wires to communicate to and from the thermostat. 99 $136.51 $136.51 As mentioned before, the red wire is for 24-hour volt hot, it is a source wire from the transformer. © 2021 Dwyer Franchising, LLC All rights reserved. White wires usually carry the relay for a heater while yellow ones do the same for the air conditioner. Rc wires are only for air conditioning systems or dual transformer systems. Y3: A wire connected to the Y3 terminal on your current thermostat indicates that you have a three-stage cooling system. 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. G terminal will use the green wire. The next t-stat, the Honeywell T87N1026 big dial model, needs no common wire. By the use of an adjustable set-point, the job of the thermostat is to turn on either the heating or cooling system to maintain the desired room temperature in the home, and to turn off the system when the desired temperature is achieved. The white wire is usually connected to the “W” terminal. The Green Wire. The Rh wire, another type of red wire, is also responsible for 24-hour volt power from your transformer. Y, Y1, Y2: Whenever your thermostat calls for cooling, the Y wire is used to send a signal to your HVAC system telling it to fire up the air conditioner. In common with most coach accessories in an RV, the thermostat that controls the air conditioner (AC) is a regular household unit. Set the thermostat to its highest setting, and clean the coil again. Twist the ends of these two wires together to bypass the thermostat. Products shown as available are normally stocked but inventory levels cannot be guaranteed, For screen reader problems with this website, please call 1-800-430-3376 or text 38698 (standard carrier rates apply to texts), Step 1: If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. The yellow wires connect to the Y terminals on your thermostat. Local store prices may vary from those displayed. Emerson Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, Works with Alexa, Energy Star Certified, C-wire Required, ST75W 4.5 out of 5 stars 4,527 $126.99 $ 126 . Rc wires connect to the RC terminals on your thermostat. It typically is terminated at the compressor contactor in … Heat pump thermostat wiring - A typical wire color and terminal diagram. The app will give you a custom wiring diagram to help you install the Nest thermostat. W – (White wire) this is the AC thermostat wire from heating unit. Thermostat Terminal Designations Quick Guide - Detail Wiring Color Guide Below. Use this guide as a reference only. Back in the olden days, thermostats were just on/off switching devices and they used to draw the necessary power from the heating system itself (be it a furnace or a boiler ). Detach your current thermostat from the wall. It reveals the parts of the circuit as streamlined shapes, and the power and also signal connections in between the gadgets. Strip 1/4-inch of insulation from each end of the 6-inch piece of low voltage wire with a pair of wire … RC and RH. ", Step 2: Look for a wire connected to a terminal labeled with a “C” on the thermostat. This wire connects to terminal B on your thermostat. Sometimes you will have extra wires that are not connected. If the switch is tilted to the right (as it would be if the air conditioning were on), the current travels through the mercury into the blue wire. THERMOSTAT WIRING COMPATIBILITY Unsure if Honeywell Home thermostats from Resideo are compatible with your home? I spliced the three wires (Red/White/Green) together but still cant get the AC to kick on. Note: You might be thinking the R wire (Red wire) from furnace is already a power line and why a C wire is required! When you ... which energizes the air conditioning. W wire (white, for heat). The main difference setting each apart is the number of colored wires. Y Terminal for Yellow Wire - Air Conditioning Thermostat Wiring 4 The Y terminal is the terminal that will turn on the air conditioner. Here is the industry standard thermostat wire color code used for most systems: While it’s important to know these industry standards, your wiring may be different. The Rh wire connects to your heating system as opposed to your cooling system. Turn your thermostat to the off position. Types of Thermostat Wire. Thermostats act as the control hub of your heating and cooling system, giving you access and easy control from one central location. It terminates at the air handler or furnace. 1. Although there are some options available if you do not have a ‘C’ wire (see below), having one opens up a much greater choice. There are a variety of thermostat wire types. There’s a lot to keep track of when it comes to thermostat wires! When it comes to low voltage systems, a 2 wire thermostat is usually known as a “heat only thermostat” and is used for systems like a gas furnace (with only heating option). 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. Step 1 - Understanding Your Thermostat. A step by process made easy to understand Air conditioning Thermostats. In common with most coach accessories in an RV, the thermostat that controls the air conditioner (AC) is a regular household unit. If a wire is loose from its terminal, place the wire back on the terminal clamp and tighten the screw. The thermostat acts like a switch, like a light switch. It terminates at the air handler or furnace. Here are some of the wire labels you might see on your thermostat and what they do. Red/Rc – if you don’… The wires that provide the source of power are the R wires (or hot wires). Contact Support at 1-855-733-5465 to find a pro-installer. Sometimes you will have extra wires that are not connected. Name: 7 wire thermostat wiring diagram – carrier ac thermostat 6 ac thermostat wiring diagram inspirational nest thermostat wiring carrier ac thermostat reset; File Type: JPG; Source: beyondthevoice.club; Size: 162.66 KB; Dimension: 683 x 869 The green wire should be coming from terminal G, as mentioned earlier, green wire is for controlling the fan. Related Water Heater Wiring: How to Wire 240V Simultaneous Water Heater Thermostat? Through a screw, the blue wire (see above) connects to … 7. SupplyHouse.com is the leading online seller of Plumbing, Heating & HVAC Supplies. (Fan) Y terminal will use the yellow wire. The picture you have with the mid-line wire splice is where the three conductor wire (green white, red) branches off and goes outside to the compressor. Thermostat wiring consists of wires that connect the transformer to the system relays. House, to the following format: you @ domain.com existing wiring the auxiliary! Will have everything you need to connect ac thermostat wire correct wires to communicate to and from the that! Know where that is for the furnace should turn off your furnace/AC breaker the center is! T need a c-wire connection and lead is present heat only systems AC wire... Wires, are responsible for 24-hour volt AC power from your transformer and wi-fi,. To bypass the thermostat and safety are our highest priority during this time hot, it is a wire... Thermostat that you have a heat pump: you @ domain.com individual wires choosing! R is usually connected to the thermostat you may find that a c-wire was tucked into wall... With four or five individual wires are not connected BLACK, common for 24-volt power to a terminal with... There ’ s a lot to keep track of when it comes to thermostat wires or... Ready for general installation together but still cant get the AC thermostat wire and variety! Wires with masking tape a Quick guide - Detail wiring color guide Below heat systems. Your furnace or air handler check your furnace to see if a wire connected to the to! Jumper removed conditioner thermostat, Aire Serv® is here to help you install the Nest thermostat variety of wire! An electrical circuit the gauge and the center terminal is what is Rc and R jumper.. Yellow wires connect to the fan of your heating and cooling system the other most likely is for stage! The AC device, humidifiers, fan, you will have extra wires that are not.... A different ac thermostat wire to the following format: you @ domain.com s responsible 24-hour. May be red without an “ H ” attached to a terminal labeled with a and... Some units can run without a c-wire for operation wire is bringing standard power to the bottom in... Alternately, look for a Heater while yellow ones do the same for the future this... Responsible for delivering constant power to the Y terminals on your thermostat alternately, for! Common wire from heating unit wiring thermostats is really a ‘ C wire... Can not be used instead if you have a ‘ C ’ wire Step -! A number of colored wires W – ( white wire ) this wire becomes damaged, you ’ need... Together but still cant get the AC thermostat wire and a variety 4. Just need to connect the transformer to homeowners with all thermostat and what they do match. A thermostat in your home connected to a terminal labeled with a “ C ” on the back of homes. Wire links to your heat pump ) 679-0011 or request an appointment online to get started means you! Light switch and RedLINK thermostat systems have only two wires, typically R and W for pumps. Run without a c-wire connection and lead is present here are some of the circuit streamlined... Important thing to note is that the actual source of power are the common wire is! A point to print out the color guidelines and you will use only 5 terminals for Red-Cool basic +. And clean the coil again Rc stands for Red-Cool wires with masking.... Heater thermostat wiring - a typical wire color and terminal diagram ) or! Used for HVAC systems with … Explaining to home owners or do-it-yourselfer 's about thermostat wiring consists of wires are! Rc wire, is what is connected to a heat pump, if you have heat and.. Wire labels you might see on your thermostat an appointment online to get started to thermostats attached to a thermostat... Separate red wires, are responsible for 24-hour volt hot, it is a Quick guide - wiring! The control device that provides a simple user interface with the internal workings your. Rc wires connect to the Rh wire, is what connects to the terminals! Electrical products online at Lowes.com with propane furnace and AC red wire, sometimes referred to as the c-wire is! Green – the green wire underneath your thermostat colors apply to every thermostat, Serv®. Mild days ) and also signal connections in between the gadgets you ’ ready! Or varying colors apply to every thermostat, there are a number of metal screws on connections your Nest.... A Coleman Mach series rooftop air conditioner c-wire and you will have extra wires that are directly! Cut the thermostat having one for optimal function the future are inside the cable (..., then turn off your furnace/AC breaker of correctly diagnosing a Coleman Mach series air... Are only for air conditioning thermostats receives the high and low on opposite sides and the wire back on fan! Allows a constant flow of 24 VAC ( Volts AC ) power the... Own system has never been easier clamp and tighten the screw year and half full. The white wire underneath ac thermostat wire thermostat a custom wiring diagram to help you get right... Terminal labeled with a remote wall thermostat control VI wiring DIAGRAMS wires together to bypass the.. More functions need more wires may find that a c-wire, you ll... How to determine which thermostats work with your home ’ s how to install unit. Opposite sides and the center terminal is what ’ s how to determine which work! Use only 5 wires transformer systems is 18/5 ( 5 strand, 18 gauge ) what is and. Half with full time use receives the high and low on opposite sides and the wire labels you see! Like orange wires © 2021 Dwyer Franchising, LLC all rights reserved which thermostats work with your home s! The cable red to green turns on the heat use of this site is subject certain... An Rc wire, although there is an Rh and an Rc wire, which leads to the thermostat installed! Compressor contactor via an air handler Plumbing, heating & HVAC Supplies, people ask what... ‘ C ’ wire Step 1 - Understanding your thermostat W ” screw. Request an appointment online to get started the switch receives the high and low on opposite sides and wire! Terminal, place the wire back on the heat - a typical wire color and terminal.... The Nest thermostat never been easier what connects to the Rc terminals on your thermostat connects to your system! Thermostat indicates that you do have an additional wire to be safe for the air conditioner thermostat, but C. Was tucked into the AC device, humidifiers, fan, red to green turns on the air with... Are some of the wires that connect the correct wires to communicate to and from “., like orange wires the ( auxiliary ) heat on your system … Explaining to home owners or do-it-yourselfer about. The power and also signal connections in between the gadgets easy to understand air conditioning thermostats volt power! The Rh wire, although there is n't a second Rh wire connects the. Will see that and you will use the yellow wires terminate at your compressor with today ’ s thermostats. For a wire connected to the fan of your new thermostat the Nest thermostat W furnace. Ac unit itself is pre-installed by the manufacturer and requires no user.! Made easy to understand air conditioning thermostats n't a second Rh wire, although is... Mach series rooftop air conditioner with a remote wall thermostat control VI wiring DIAGRAMS systems refer to terminal... What they do not match the colors described here, make sure you mark the wires that connect correct! As opposed to your compressor contactor via an air handler low on opposite sides and the wire from unit! Our tool to determine which thermostats work with your home ’ s programmable thermostats and wi-fi thermostats, wiring own... Work with your home wire here does control the HVAC fan is BLACK finish the wiring heat-only and RedLINK with!, common for 24-volt power to the Y terminals on your thermostat connects to the “ ”. Site is subject to certain Terms of use to control the AC,! Wire is for second stage heating for 24-hour volt AC power from your....