The O/B wire can have many configurations. When the Red wire is disconnected from W the furnace should turn off. The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system. The thermostat wiring on … The two 24 volt wires go to the R terminal and C terminal inside the thermostat. Yellow – The yellow wire connects to the compressor on a heat pump. 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 If in the previous step you identified an O, B, or To make sure that your system is off, change the temperature on 12VDC (-) or. If you have two wires, R or RH will go into the R terminal, and RC will go heating). Learn more about Resideo's response to COVID-19 >, See current discounts, promotions and bundles, Get more back and more out of your products. Connect with an agent for quick assistance. 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. It has one 3 wire zone valve and one thermostat. I do have another question that popped up after I installed it. I moved in two years ago and the heat pump never functioned with the old thermostat, I've used it for central air only. The most common configuration is whether you have a heat pump system or not. The white wire connects to terminal W in industry-standard thermostats. Running new thermostat wire can challenging even for professionals. I bought a Honeywell Heating thermostat. Saturday and Sunday: 9am - 5pm CDT, Indoor Air Quality and All Other Homeowner Products Before troubleshooting, double check that the thermostat is … 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. Furnace … Usually the thermostat wires go to either a control board, or a transformer with spots for thermostat wires. W This is the main wire that connects to the furnace whether the heating source is a gas, oil or electric furnace. Each of these wires has a name featuring a single letter (listed below). Troubleshooting A Furnace Thermostat More wires lets the thermostat do fancier things, like control the air conditioning, run the fan without running the burners, maybe operate a whole-house humidifier, etc. A heat pump system, on the other hand, has eight or more different thermostat wires. I can send pictures to your email. Furnace 24 Volt Transformer Professional HVAC Contractor to continue. Thermostat wiring is color-coded. At the furnace, the unused wires are not connected to anything--shown here at the bottom. Thanks so much Steve! White – The white wire is what connects to the (auxiliary) heat on your system. There will be several wires that lead to different locations, especially if the thermostat operates a dual heating/cooling control. heating, cooling, fan, etc. For shorter runs use 20 gauge. If you don’t know your system type, place this wire into the W terminal. heating and cooling equipment. A thermostat is a switch that can automatically turn on a furnace when a set temperature is reached. C and R on the control board are 24VAC. Strip the casing ¼ inches from both ends of both wires. Even though a red wire is supposed to go to R and a black wire to C the colors of the wires can sometimes differ. Furnace. The thermostat uses 1 wire to control each of your HVAC system’s primary functions, such as the system turn on within 5 minutes, the power is off. Your email address will not be published. Install your Nest thermostat without these wires. On a normal setup, it would be red to r, white to w, green to g, yellow to y, blue to common. 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. - You have a single wire labeled W-O/B and we advise placing it in the O/B terminal. The two 24 volt wires can NEVER touch or the transformer will short and need to be replaced. 3-wire heat-only thermostat (R, G, W) Installing your ecobee with a boiler and AC (dual transformer system) ecobee thermostat … We use cookies to give you the best possible experience on our website. A wire connected to the W3 terminal on your current thermostat indicates that you have a three-stage furnace. Answer: Thanks for the email, Ed, and I’m glad to help. Sorry, something went wrong. Speak directly with an agent for help with our products. Wiring Guide for a Honeywell Thermostat Electrical Question #1: How do I connect the wires for a heater thermostat? The thermostat wire that serves the furnace is the wire that has two individual wires inside, red and white. Choosing the Proper Gauge: 18 or 20. Run the thermostat wire from your furnace to the location where your thermostat will hang. Your wiring will match one of the options below. This wire will go to the G terminal on your new thermostat. Monday through Friday:9am to 8pm CDT Of course if in doubt be sure to call a professional. How Does a Thermostat Turn on a Furnace? It recently stopped working and I’m trying to follow the power through the devices. your common. *You should be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. Both the furnace control board and the thermostat will usually have the same terminal letters. *There is no standard for which color wire controls each function. the two terminals. I think the wiring diagram is on a printed sticker on the side of the water collector, just I am ready to hook to the hunter thermostat and do not know which wires to connect to.

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