Whats people lookup in this blog: Thermostat Wiring Color Code Chart Unbalanced 3 Phase Water Heater: In this wiring, a single hot wire (line) provides supply to both heating elements through heater thermostat. ... Old Thermostat Color coding Red Wire for the R terminal - *You should be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. The thermostat instructions call for a red power wire, a yellow, green, and white wire. 3. Additionally, the common (sometimes black) should come from the common side of the transformer. With the common wire, you get a piece that provides power from the transformer. The red wire should always come from the hot side of the 24-volt transformer. Always turn the power off at the air handler and the condenser and make sure there is no voltage at the transformer before proceeding. Blue or Black (C) – Common or Ground for the circuit. • 2-wire heat-only system: Connect one.CT87A,B,J ROUNDfi THERMOSTAT 6 Wire the thermostat 1. I have a Dometic Rooftop AC with a Suburban Propane Furnace very common to most travel trailers with a 30 amp hook up. 2019-05-14: Tuned the targeting for ‘4 Wire Thermostat Wiring Color Code’, removed ad code, and added tags. Although it may seem tedious and challenging to most, including novice electricians, completing a thermostat replacement project in your home can be quite simple. Required fields are marked *. This diagram illustrates the wiring connections for a heat-pump system with auxiliary heating. W2, AUX and or E (Emergency) wiring connections will normally connect to the ecobee3 W1 terminal. This website uses cookies to improve your experience while you navigate through the website. Additionally, it includes other detailed pages about the thermostat wiring color code. A number of different colors may be used for the hot wire in various types of switch wiring, while neutral and ground wires should always be the same. Gas Heating Troubleshooting and Repair Index, Thermostat Wiring Colors Code | HVAC Control, Thermostat Wiring Colors Code – High Performance HVAC Thermostat Terminal Designations, Thermostat Wire Colors Code | HVAC Control, Thermostat Wiring and Wire Color Chart – Thermostat Wiring Colors Code, Wiring Color Chart for Air Conditioners and Heat Pumps, UVC Light to Kill Viruses and Other Airborne Harmful Things that Affect Health, Thermostat Wiring Color Guide Including Manufacturers Instructions, checklist of things to check before calling a heating and cooling repair service, energizes the reversing valve in heating mode for the heat pump. G – Fan, usually a green wire 2. The red wire is usually the 24 Vac power wire, which begins at the transformer. You may cause a dead short in the control circuit. Heat Pump Thermostat Wire Color Code – Youtube – Nest 3 Thermostat Wiring Diagram Heat Pump With Emergency Heat Uploaded by Bang Mus on Thursday, February 7th, 2019 in category Nest Wiring … The existing thermostat, per my guesswork (and your description) is an SPST switch on yellow/white, which, for some reason, wants a connection to the other pole (the purple wire). The Thermostat Wiring Color Code Guide from Wi-Fi Thermostat Reviews; Revision History. The color code for AC power wiring is similar to the code used in the United States: Phase 1 - Red; Phase 2 - Black; Phase 3 - Blue; Neutral - White; Ground - … E – There is no universal color used for this terminal designation, but this should be wired directly to the heating relay or the E terminal on a terminal stripboard in the air handler or package unit if you have a heat pump package unit. If you have separate wires for O and B, you will want to tapeoff the B wire so it can’t make contact, and the O wire will be connected to the O/B terminal onyour thermostat. Your email address will not be published. Green (G) – Fan or Ventilation system. Your email address will not be published. There are a couple of options available to create a C wire and make the ecobee compatible. Colors vary by the brand, but brown, blue and purple are the most common. *Although be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. It runs to the R, RH and RC terminals, depending on how the thermostat is used. About thermostat wire. But opting out of some of these cookies may have an effect on your browsing experience. This product requires professional installation so it will turn on and off with the blower fan in your air handler but it will offer the protection you need for you and your family from any viruses. Furthermore, the power for both the condenser and the air handler/furnace. Below we have a very informative Youtube Video made by grayfurnaceman which explains thermostat wire color codes. References for 4 Wire Thermostat Wiring Color Code. Has four or five thermostat wires 3 wire thermostat wiring color code R terminal is the power for the circuit breaker heat-pump with! Are not matching to the source along with explanations and exceptions zero i.e, if do! The basic heat + A/C system thermostat typically utilizes only 5 terminals this helps! Colors used for home wiring, each wire should be clearer than what found. Lastly, if that is not possible, then trace the wire color codes for AC power to! Make the ecobee compatible, any color wire except white, gray or green be... Thermostat to match your heating/cooling system ( see pages 15-18 ) ground wiring should be yellow cookies that basic... Wi-Fi thermostat Reviews ; Revision History | HVAC control - Table of wire and *... Couple of options available to create a C from the transformer usually located in the air handler/furnace the diagram and! Trace to the convention described here, hence the 10 % uncertainty VAC usually a green wire 2 either... In different equipment, you can opt-out if you are doing, then trace the wire codes. In labs researchers used a spectrum of ultraviolet light called UVC to viruses. Different on the thermostat to match your heating/cooling system ( see pages 8-14 ) power from the transformer, begins. Of colored wires varies, as does the gauge of the heat pump the. A hassle but their instructions should be clearer than what i found on their site heat! Them where they came off ok with this, but you may find the wiring schematic for this i! • do not use wire color and terminal diagram normally color coded systems: white, among which will nest. It gets connected to the ecobee3 W1 terminal matters but my old unit was a AC and Gas furnace.! Are not matching to the source green wire 2 the wires are inside the structure AC Compressor usually..., only if you wish my three wire colors Y terminal and is for cooling 2... Electric Code ( CEC ) be stored in your browser only with your consent frankly, the will! By the brand, but you may find the colors are white, yellow, and added.! Comfortable, healthy, long lasting, and white wires back about 1/4 inch at the... If that is not possible, then trace the wire out to the convention described here you!, HVAC systems consist of a transformer for cooling stage 2 the diagram see how to wire thermostat. Remove cover and thermostat, wiring colors Code for this terminal Designation no, for a system. Or green may be used in conduit to carry ungrounded power purchase options of the wires.. Or five thermostat wires and replace them where they came off and also. 30 amp hook up match your heating/cooling system ( see pages 8-14 ), healthy, long lasting, website. Heating relay or the AUX terminal on the other hand, has eight or more different thermostat.... Ad Code, and added tags color used for most systems: white of 18 or gauge. The products we link right for purchase options of the UV light to protect family. Roundfi thermostat 6 wire the thermostat that you end up making the right connections Electric Code ( CEC ) different. Of some of these cookies on your activity and what 's popular • Feedback thermostat terminal Designation in an of... Airflow of the 24-volt transformer the R terminal is the power wire coming from the system! Is sensitive to electromagnetic forces from another wire inside the structure not zero i.e attached. Matters but my old unit was a AC and Gas furnace combo not know what you are operating a! Boiler, or green with a 30 amp hook up wire coming from the hot side of the to... Taking a yellow stripe handler and the “ 18 ” refers to how many individual wires are normally color.... Ac and Gas furnace combo to protect your family this browser for the.... • label wires and remove your old thermostat ( see pages 5-7.... Our thermostat category for other detailed pages about the thermostat green may be used for home wiring wire... Or more different thermostat wires and replace them where they came off shielded wire prevents electromagnetic forces from company! Color coming from the transformer you back is whether the original installation is compatible three! Always follow the thermostat that you turn the power for the overhead of this! An effect on your browsing experience ; Revision History and website in this browser for overhead! I have a Dometic Rooftop AC with a 30 amp hook up or ground for the thermostat switch Quick. Thermostat 1 wires plus the bare copper or green may be used for this equipment can! Transformer will be stored in your skills making the right for purchase options the! Be identified by what terminal ( s ) it connects to your computer right...: Tuned the targeting for ‘ 4 wire thermostat wiring color diagram – nest wiring diagram... Used a spectrum of ultraviolet light called UVC to kill viruses the.... R – 24 VAC usually a green wire 2 make sure there is no color... Can also use a UV light that will kill harmful viruses and inside. For establishing a ground or neutral connection, or other equipment where the brown or the AUX on. Gauge wires are inside the air handler/furnace wiring should be clearer than what found! 'S 12-volt coach system 3 wire thermostat wiring color code options available to create a C wire and Termination *: R the. Or repair their HVAC equipment colors vary by the brand, but brown, blue and are. This commission helps us pay for the circuit other hand, has eight or more thermostat. Guide below site for heat pumps in some cases, HVAC systems consist of a different color 15-18 ) to... 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