If you find the colors are not matching to the convention described here, you can always trace to the source. thermostat category for other detailed articles on thermostats. *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. This website uses cookies to improve your experience while you navigate through the website. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. It terminates at the air handler or furnace. *Although be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. Your email address will not be published. There is no official standard for thermostat wire colors. But opting out of some of these cookies may have an effect on your browsing experience. R Terminal for the Red Wire; W Terminal to the White Wire; G Terminal to the Green Wire; Y Terminal to the Yellow Wire; C Terminal to the Blue Wire; Red Wire for Air Conditioner Control Power (Hot) Additionally, the common (sometimes black) should come from the common side of the transformer. Your email address will not be published. Always follow the thermostat manufacturer’s instructions whenever changing the thermostat. However, these are the most wiring methods used based on my years of experience in the HVAC field, where I successfully wired a lot of thermostats. Perhaps one of our readers here can help you. For additional protection you can also use a UV Light that will kill harmful viruses and bacteria inside the airflow of the air handler. Copyright© 2020 HighPerformanceHVAC.com |. 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? Necessary cookies are absolutely essential for the website to function properly. The thermostat wiring on these systems can have very similar wiring . Without the O functionality, the system will not cool. These cookies do not store any personal information. Remember, the wires coming from the thermostat are terminated in the HVAC equipment. Importantly, there are a few reasons for this: First, as mentioned, there is high voltage in the equipment and can be hazardous to your health. Furthermore, for the thermostat, wiring colors code for this terminal (if equipped) consult … Complete listing of electrical wire types and parts used for air conditioners with electrical code information serves as selection guidelines. 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, How to Test a Thermocouple with a Multi-Meter. Yellow Wire for Y Terminal. We do get a small commission from any sales for our affiliates for which we link. C stands for common, and there is no universal color used for this terminal, although black is the most common color I’ve seen. Finally, this way, you can match up the appropriate wire color coming from the thermostat to what it controls in the equipment. This website uses cookies to improve your experience. They control your air conditioning system. You also have the option to opt-out of these cookies. Red Wire for RC terminal. Furthermore, the signal needed to get an accurate temperature is sensitive to electromagnetic forces from another wire inside the structure. *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. Thermostat wiring colors is not so difficult once you understand how the system works and which wire goes where on the thermostat terminal board and where that wire is terminated in the equipment. *Although be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. These links will lead to you purchase a product from another company. » You Can Avoid Costly Mistakes! I have a Dometic Rooftop AC with a Suburban Propane Furnace very common to most travel trailers with a 30 amp hook up. Finally, if that is not possible, then trace the wire out to the source. In either case, it is crucial to find the wiring diagram for the unit.