The yellow wires connect to the Y terminals on your thermostat. HVAC systems with more functions need more wires to communicate to and from the thermostat. Y Terminal for Yellow Wire - Air Conditioning Thermostat Wiring 4 The Y terminal is the terminal that will turn on the air conditioner. Thermostat wire comes in many different varieties. Install the New Thermostat The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. © 2000-2020 Home Depot Product Authority, LLC. 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. If the colors of the wires do not match the colors described here, make sure you mark the wires with masking tape. a high level for extremely hot or cold days, and a low level for mild days). (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.) C wire (blue or black, common for 24-volt power to the thermostat). SupplyHouse.com is the leading online seller of Plumbing, Heating & HVAC Supplies. Local store prices may vary from those displayed. Find thermostat wire at Lowe's today. process of correctly diagnosing a Coleman Mach series rooftop air conditioner with a remote wall thermostat control VI WIRING DIAGRAMS. roof top air conditioner and any furnace with a 12 VDC control circuit. So the G wire here does control the HVAC fan. The thermostat should automatically complete these connections when a set temperature is reached. The yellow wires terminate at your compressor contactor via an air handler. Twist the ends of these two wires together to bypass the thermostat. Inside the air conditioner thermostat, there are a number of metal screws on connections. The orange wire connects to terminal O on your thermostat. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. White – The white wire is what connects to the (auxiliary) heat on your system. All Rights Reserved. The Rh wire connects to the RH terminal on your thermostat. The C wire, a.k.a. Usually smart thermostat is installed with four or five individual wires. The wires that provide the source of power are the R wires (or hot wires). These are Installing the on my RV with propane furnace and AC. Heat pump thermostat wiring - A typical wire color and terminal diagram. Make it a point to print out the color guidelines and you will have everything you need to finish the wiring. The yellow wires underneath your thermostat connect to your compressor. Here’s how to determine if you have a c-wire thermostat: Turn your thermostat to the off position. If you have heat and AC, you’ll need 18/5. I spliced the three wires (Red/White/Green) together but still cant get the AC to kick on. The green wire should be coming from terminal G, as mentioned earlier, green wire is for controlling the fan. R terminal will use the red wire. The other most likely is for the air conditioner (Rc). 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. RC and RH. 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. RC-Wire - connects to the RC terminal. Thermostat wire comes in various weights. It reveals the parts of the circuit as streamlined shapes, and the power and also signal connections in between the gadgets. That is common. 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. If you need help installing your new thermostat, Aire Serv® is here to help you get it right. Y1 and Y2 wires might be used instead if you have a two-stage system (i.e. W wire (white, for heat). Use of this site is subject to certain Terms Of Use. Variety of 4 wire thermostat wiring diagram. What thermostat wire labels mean. Air Handler, AC, and Boiler, Rc and R jumper removed . Wiring an AC thermostat becomes … Tighten any loose screw terminals. It terminates at the air handler or furnace. Blue wires are for heat pumps, like orange wires. The best way to make sure is to check the letter on the thermostat terminal to which each wire is attached. Remove the wire from the “W” terminal screw and the wire from the “R” or “Rh” terminal screw. 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. Your health and safety are our highest priority during this time. Thermostat Terminal Designations Quick Guide - Detail Wiring Color Guide Below. The Green Wire. Read on for information about all possible thermostat wires. Y2-Wire - … Learn Your Wiring The first thing that you need to learn is how your thermostat works. Check the area behind the thermostat to see if a c-wire was tucked into the wall by your electrician or the installer. In case, you need to change one of those wires out. 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. A step by process made easy to understand Air conditioning Thermostats. There’s a lot to keep track of when it comes to thermostat wires! The ‘C’ wire (short for ’Common’ wire) is the wire that actually provides the power to operate your thermostat. 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. Go to the following article for step-by-step installation instructions. The common wire, sometimes referred to as the c-wire, is what’s responsible for delivering constant power to your thermostat. It terminates in your outdoor condenser for reversing valve operation from hot to cold. Blue wires are also called “C” wires because they are the Common wire. The main difference setting each apart is the number of colored wires. Air Handler, AC separated from Furnace, Rc and R jumper removed . If this wire becomes damaged, you will need to replace the entire length of wire. Homeowners with geothermal heat pumps have no use for the orange wire. How to Check if You Have a ‘C’ Wire The Red to white switch turns on the heat. The unit could be furnace, oil or gas furnace, boiler or electric furnace. I accidentally cut the thermostat wire that leads from the inside of my house, to the AC unit outside. The yellow wires connect to the Y terminals on your thermostat. Set the thermostat to its highest setting, and clean the coil again. Call (855) 679-0011 or request an appointment online to get started. Red to Green turns on the fan, Red to Yellow turns on the air conditioner. Types of Thermostat Wire. These two connections will ensure that there is power to the thermostat that you are operating. 99 $136.51 $136.51 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 green wire underneath your thermostat connects to the fan of your furnace or air handler. Orange – This wire connects to your heat pump (if you have one). RH-Wire - connects to RH terminal. It terminates at the air handler or furnace. If you see a wire connected to your current thermostat’s W3 terminal, we recommend booking a pro near you to install your ecobee. The temperature controller built into the AC unit itself is pre-installed by the manufacturer and requires no user wiring. There are a variety of thermostat wire types. Red/Rc – if you don’… When the Red wire is disconnected from W the furnace should turn off. Look for a wire connected to a terminal labeled with a “C” on the thermostat. Check out multiple thermostat wiring diagrams as well as in depth video explanations on accurately wiring thermostats for various types of HVAC systems! 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. The unit could be furnace, oil or gas furnace, boiler or electric furnace. This wire is also known as the RH wire. Rh stands for Red-Heat and Rc stands for Red-Cool. They control your air conditioning system. The green wire connects to terminal G on your thermostat. 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. So if you are an 18-6 wire and you are going to have an additional wire to be safe for the future. Types of Thermostat Wire. In common with most coach accessories in an RV, the thermostat that controls the air conditioner (AC) is a regular household unit. Need Help? Likewise, people ask, what thermostat wires mean? Red wire should be attached to the thermostat RH or thermostat RC terminal. Then, reset the thermostat to its desired setting. 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