For the thermostat, wiring colors code for this terminal (if equipped) consult with the installer. Each individual conductor is sheathed in a protective, flexible coating of a different color. *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. Additionally, in different equipment, you will find a bundle of wires with wire nuts holding them together. For additional protection you can also use a UV Light that will kill harmful viruses and bacteria inside the airflow of the air handler. Incompatible wiring (installing a new five wire thermostat to a four wire base) requires higher expertise, and in some cases professional help. Green Wire for G Terminal. Thermostat Wiring and Wire Color Chart. 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. It can be W-O/B, O/B, W-O, W-B, or you mayeven have separate O and B wires. Description: Room Thermostat Wiring Diagram Wiring A Thermostat With 3 Wires pertaining to 3 Wire Room Thermostat Wiring Diagram, image size 800 X 600 px, image source : wisedesign.org, and to view image details please click the image.. The usual terminals are: 1. 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. We also have another really good video made by David Jones which shows how to wire up a thermostat. Yellow. References for 4 Wire Thermostat Wiring Color Code. Terminal 06 is usually the supply wire to AC high fan speed, taking one of two green wires -- the orientation is unimportant. The red wire is the power wire coming from the secondary winding of the transformer. 2002 Nissan Altima Bose Stereo Wiring Diagram. It is terminated in the air handler or package unit if you have a heat pump package unit. R – 24 VAC usually a red wire (Rc and Rh are discussed later) 3. It runs to the R, RH and RC terminals, depending on how the thermostat is used. Furthermore, the power for both the condenser and the air handler/furnace. Before proceeding, we highly advise that you turn the power off at the circuit breaker. 47 C is known as the common terminal. These links will lead to you purchase a product from another company. C – 24 VAC Common 4. The color of wire R is usually RED and C is BLACK. Below we have a very informative Youtube Video made by grayfurnaceman which explains thermostat wire color codes. CT87N. Label that wire with the corresponding letter in the third column 4. Your email address will not be published. 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. Click on the image to enlarge, and then save it to your computer by right clicking on the image. the 3 going to the central air are Y,Rc,G. C stands for common, and there is no universal color used for this terminal, although black is the most common color I’ve seen. The “18” refers to the gauge and the “5” refers to how many individual wires are inside the cable. If necessary, call Honeywell’s support. W2, AUX and or E (Emergency) wiring connections will normally connect to the ecobee3 W1 terminal. This wire connects to your heat pump (if applicable). There are a couple of options available to create a C wire and make the ecobee compatible. Since boiler does not need a cooling function or the fan function, these two wires are not found here leaving three wires mentioned as below: Red wire for 24-volt hot.