We'll assume you're ok with this, but you can opt-out if you wish. See the thermostat manufacturers instructions. The heating system will likely be a gas or electric furnace. The blue wire was hooked up into the yellow spot! Sophisticated gadgets and devices also come to improve your house using technology, one of which will be Nest thermostat. wiring. Your email address will not be published. That’s good news. 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. The power comes back up on the black wire in the same cable. 4 wire thermostat wiring diagram – What is a Wiring Diagram? Tap “No, it is not on the wall.” Follow the in-app instructions to wire the thermostat. Either that or call a professional to figure it and to be safe. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. Mechanical mercury switch thermostats with no special lights do not require the C-Wire. The two green wires at the thermostat are connected G-green, G-yellow. Step 4. These links will lead to you purchase a product from another company. This wire controls the cooling (first stage). In the setups we’ve seen, the most common wire color code guide for single stage climate control thermostat follows. 4 wire thermostat wiring diagram – You’ll need an extensive, expert, and easy to understand Wiring Diagram. You did not mention if you had any additional wires there in the thermostat bundle because with your new thermostat, you are going to need one extra wire. Tap the + sign to start installation. Replacing an outdated four-wire thermostat with a newer model that uses two wires is not complicated, once you purchase the thermostat from a home-and-garden shop or hardware store. This would be for a 220v vs 110v baseboard wiring. Choose the thermostat that best fits your needs and preferences. Download the Sensi app on your smart phone or tablet. With today’s programmable thermostats and Wi-Fi thermostats, wiring your own system has never been easier.However, it still requires a thorough setup. My question is can I hook up one of the extra wires to the C terminal on the HVAC where the white wire is and then hook the other end to the C terminal on the thermostat? Step 5. This wire is used only for heat pumps. One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. Later on though, we hope to run new t-stat wire, that has more conductors, so we can get the C as well as the G wires. Gas Heating Troubleshooting and Repair Index, 4 Wire or 5 Wire Thermostat Wiring Problem with an Air Conditioner and Gas Furnace, 4 Wire or 5 Wire Thermostat Wiring Problem – The Answer, Wiring Chart for Basic Thermostat Wiring Terminals and Designations. Product Reviews, Experiences, and Technical Insights from Thomas J. Hesley. A heat pump system, on the other hand, has eight or more different thermostat wires. Replacing an outdated four-wire thermostat with a newer model that uses two wires is not complicated, once you purchase the thermostat from a home-and-garden shop or hardware store. The new units are of correct volts (240) and amp capacity. Answer: Thanks for the email, Ed, and I’m glad to help. This t-stat also needs no C wire. Bob shows you how to upgrade from a four wi... Bob installs a smart thermostat, which requires a five wire connection. In the setups we’ve seen, the most common wire color code guide for single stage climate control thermostat follows. 4 Wire or 5 Wire Thermostat Wiring Problem – Additional reader questions: UVC Light to Kill Viruses and Other Airborne Harmful Things that Affect Health. A wiring diagram is a simplified standard photographic depiction of an electrical circuit. Step 2. Jumper wires are short wires between two connectors. Thermostats act as the control hub of your heating and cooling system, giving you access and easy control from one central location. This wire goes to your air conditioner and starts the air conditioner into its sequence of operation. Ross suggests taking a picture of the wiring configuration to keep track of which wire goes where. I can only assume it is un-used for anything, at least this jumper you are talking about here. Also referred to as the C wire, this wire connects the low side of the output of the low voltage power to the t-stat. If it is not there then you will need to pull new wire and rewire. This article will help you – Running New Thermostat Wire along with this article - All About Thermostat Wire and another article will help you gain some understanding of basic control circuits in HVAC if you want to learn more and take it that far. How do I wire and install my thermostat? What do I need to do I thought blue was there c wire? My old thermostat only has 4 wires (No C). There’s a lot to keep track of when it comes to thermostat wires! Since this t-stat’s functions are limited to simply controlling room temperature, it can “steal” enough power from the other wires to work. On the back of the thermostat are a number of labeled contacts, only the following have wires connecting them:W - white wireY - blue wireR - red wireG - green wireY wire jumpered to a contact labeled 1. 97 Featuring solid, bare-copper conductors and 6 miles of PVC insulation, this wire is … The red wire (R, RC, RH) connects the high side of the output of the control transformer to the t-stat. Replies: 11 Views: 39,834. vaf888 3 Feb 2014. Yellow Wire = Y = Cooling Wire There is high voltage inside the unit so if you do proceed to do it yourself make sure you turn the power off before proceeding. 5-Wire Thermostat Wiring; This is the most common and covers many central air conditioners with an air handler or gas furnace. We were given a new Honeywell VisionPRO Wi-FI Programmable Thermostat model TH8320WF and would like to install it. Your email address will not be published. Any suggestions on how to wire the new thermostat? Am I compatible with ecobee? ... help needed wiring a honeywell T6360 room Thermostat. Nest 4 Wire Wiring Diagram – nest 4 wire wiring diagram, nest hello wiring diagram 4 wire, nest thermostat 4 wire wiring diagram, Technology makes a much better life and it is true. For the same type of systems, here is a breakdown for the type of HVAC systems they control: *Some boiler systems have multiple zones. Orange – This wire connects to your heat pump (if you have one). Find product info & resources here. Apr 21, I purchased one of these Honeywell RTHB thermostats to try it out, but the instructions are pretty much useless and my wires … I am trying to install a smart thermostat. Note that in our case, we had to use the green wire for C, as discussed below, because there were only four wires coming from the furnace to the t-stat which included no blue, brown, or black wire. Nest 4 Wire Wiring Diagram – nest 4 wire wiring diagram, nest hello wiring diagram 4 wire, nest thermostat 4 wire wiring diagram, Technology makes a much better life and it is true. That way if … 5-Wire Thermostat Wiring; This is the most common and covers many central air conditioners with an air handler or gas furnace. Just follow the instructions that come with the new thermostat. Create an account or sign in. This wire, along with a red wire, go from the HVAC to the outside unit. White Wire = W = Heating Wire . CAUTION Electrical Hazard. STEP 6 – WIRING YOUR NEW THERMOSTAT. Typically, a furnace plus A/C HVAC system has four or five thermostat wires and a common wire. For the C wire you will need an additional wire. The answer to the question depends on the type of system you have and what kind of thermostat you have for control. When you only have 4 wires from the furnace to work with, and you cannot run a new cable with more wires, then you’ll likely have to give up some functions of today’s heat pumps, central heating, and central cooling systems. This guide will explain how to wire a thermostat in your home. With this sort of an illustrative guidebook, you are going to be able to troubleshoot, stop, and complete your tasks without difficulty. 3-wire heat-only thermostat (R, G, W) Installing your ecobee with a boiler and AC (dual transformer system) ecobee thermostat installation with an isolation relay; ecobee3 lite with 4-wire hot water zone valves R-wire - red wire (can also be RH or RC - read thermostat manufacturer instructions). Step 6. The major component to look out for if you don’t know the wiring system is the common wire, which is always absent from a four wire setup. 4-Wire Thermostat Wiring I completed the install using the C-wire adapter. Some systems still have the older mechanical thermostats, which are typically 4-wire thermostats that control the same type of system described above. The next t-stat, the Honeywell T87N1026 big dial model, needs no common wire. The switch appears to be in series with the R wire. A thermostat is designed to control the temperature of a heating or cooling unit in the home. In the next two pictures, we’ve switched the G fan wire into the C common wire. Typically, a furnace plus A/C HVAC system has four or five thermostat wires and a common wire. Thermostat Wire 18/4 - Brown - Solid Copper 18 Gauge, 4 Conductor - CL2 (UL Listed) CMR Riser Rated (CL3) - Residential, Commercial and Industrial Rated - 18-4, 50 Feet 4.7 out of 5 stars 73 $24.97 $ 24 . On the HVAC, there is a 5th wire, which is white and connects to the C terminal. We have both a natural gas furnace and an AC unit. It shows the components of the circuit as simplified forms, and also the power and also signal connections in between the devices. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends. A heat pump system, on the other hand, has eight or more different thermostat wires. Connect the supply grounding wire to the green grounding screw, if you have not already done so. Typical 4 wire thermostat (t-stat) wiring examples follow. This website uses cookies to improve your experience. For the new thermostat to work, you need a 24 volt common to complete the circuit with the 24-volt hot wire to provide power for the thermostat because it is a state of the art digital programmable wi-fi thermostat it will need 24-volt power to work. If not already present, route supply wire from the circuit breaker to the thermostat wiring box, and from the thermostat wiring box, to the heater, for later use. This is commonly found in standard HVAC systems that use an air conditioner and a furnace. Thermostat Wiring Color Code. Trane Thermostat Wiring . 4 Wire Nest Thermostat Wiring Diagram – nest thermostat wiring diagram 4 wire, Technology creates a better life and it’s true. We also use third-party cookies that help us analyze and understand how you use this website. The thermostat has a total of four wire leads: two marked LINE that connect to the circuit feed wires, and two marked LOAD that connect to the circuit wires leading onward to the heater. For this one, the red wire would attach to the R screw, the green to the G, the yellow to the Y, and the white wire to the W terminal, for single stage operation of both heating and cooling systems. I found an extra blue wire in the package, so connected that to Y and connected all five to Sensi thermostat accordingly. This goes to the 24 volt common side of the transoformer and is typically not used for mercusry type thermostat unless the thermostat requires power. The next t-stat, the Honeywell T8775C1005(2) non programmable t-stat can control both heating and cooling, as well as manual fan operation, with just four wires. Most people do not, and they end up calling in a professional to get the job done. You can avoid a major headache later on that could damage your entire system. 4 wire thermostat wiring diagram – You’ll need an extensive, expert, and easy to understand Wiring Diagram. HAVE A 4 WIRE THERMOSTAT FOR A 2 WIRE OUTLET. Red is the 24-volt hot wire which would power the relays or circuit boards for the air conditioner, the gas furnace, and the blower along with any accessories in the system controlled by the thermostat. You already have the 24 volt hot with the red wire, so now you need to either find another wire in that bundle or run all new thermostat wire so you will have the proper amount of wires for the job. Finally, the 5 wires likely cover Red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (common could be another color). Connect the white wire to the "W" terminal on the furnace and thermostat. Answer: Thanks for the email, Ed, and I’m glad to help. A wiring diagram is a streamlined conventional pictorial representation of an electrical circuit. Step 4. The picture above depeicts the typical wiring color code for a 4 wire thermostat. Typically in most HVAC systems, this would be the yellow wire. The above is a typical wiring diagram of a Nest Thermostat with 4 wires. stephenmx50, 1 Jan 2010, in forum: Plumbing and Central Heating. Replacing an outdated four-wire thermostat with a newer model that uses two wires is not complicated, once you purchase the thermostat from a home-and-garden shop or hardware store. 2 Way Light Switch. Well, we provided you with the most common thermostat wiring color codes and conventions but every now and then someone does a DIY job or just didn’t know what they were doing and uses different colors for different things and they don’t match up in the thermostat. You will likely have to trace the wires from the source inside the air handler. Remove jumper wires and save them. The new thermostat you purchased sounds like a double pole thermostat that supports two hot connections and two switched connections. Both examples of how to wire a Honeywell thermostat with 4 wires are discussed below. But my Ac compressor not kicking on. RC - Red Wire (Power 24 Vac) RH or 4 - Red Wire Jumpered (Power 24 Vac) W - White Wire (For Heating Enable) Y - Yellow Wire (For Cooling Enable) G - Green Wire (Controls Fan ON-Auto) The diagram shows how the wiring works. I have a white, red, green, and blue wire but no yellow ! which terminate next to but not connected to our Weil McLain boiler. A thermostat turns your furnace and air conditioner on or off depending on the temperature in the room and the setting on the thermostat. 4 Wire Thermostat Wiring Color Code. So the G wire here does control the HVAC fan. The red wire (R, RC, RH) connects the high side of the output of the control transformer to the t-stat. To review a wiring diagram, initially you need to know just what fundamental elements are included in a wiring diagram, and which pictorial symbols are utilized to represent them. This involved getting into the furnace at the other end of the wires, and moving the green wire from the G to the C spot on the wiring block. Mentioned below are the most frequently used terminals as … Connect the supply grounding wire to the green grounding screw, if you have not already done so. We do not have a heat pump, so I planned to use the conventional wiring. The one catch is that my furnace has a sump pump with a float switch. With this sort of an illustrative guidebook, you are going to be able to troubleshoot, stop, and complete your tasks without difficulty. Note: On Rheem and Ruud heat pumps this wire may be a different color. In this case, we chose to give up control of the fan, to power our Honeywell Wi-Fi t-stat. Heck, now I’m not calling anyone a dummy! Here is a picture gallery about 3 wire room thermostat wiring diagram complete with the description of the image, please find the image you need. besttoday.info. Understanding where the wires go and what they do help you. My existing thermostat has the typical 4 wires (R, G, Y, W) but the bundle in the wall has 5 unused wires The HVAC has the same 4 wires connected and the bundle at that point has the same unused wired. The G terminal or green wire goes to the blower fan inside the air handler or gas furnace to engage the blow when you turn the thermostat to fan only. It reveals the parts of the circuit as streamlined shapes, and the power and also signal connections in between the gadgets. My current wiring only has 4 wires but I understand I can use the fan wire and make it a common wire. The wiring part is easy as pie. My wiring had 5+ wires going to the thermostat initially, however only 4 were in use (R, Y, G W). That means you need a 24-volt hot and a 24-volt common wire. Can I simply connect the black wires from the thermostat to the black in the outlet box and white to white? Wiring a Smart Thermostat Electrical Question: My current wiring only has 4 wires but I understand I can use the fan wire and make it a common wire. Multiple zones require a thermostat for each zone unless you have a digital thermostat system that has linking capabilities for wireless sensors. The red wire (R, RC, RH) connects the high side of the output of the control transformer to the t-stat. You also have the option to opt-out of these cookies. The Honeywell CT410B1017 Manual 4 Wire Thermostat is a simple to install unit that's compatible with 120, 240 and 227 vac baseboard systems. We purchased a new basic thermostat that only has hookups for 4 wires. The wiring at the thermostat also seems standard. What would be the best way to wire a heat pump? Thermostat Wiring Diagram 4 Wire from wholefoodsonabudget.com To properly read a cabling diagram, one has to learn how the particular components within the program operate. Typical 4 wire thermostat (t-stat) wiring examples follow. Again, no blue wire here. Step 1. Use electrical tape and cover the metal part with the tape. Enter your email address to subscribe to this blog and receive notifications of new posts by email. These thermostats have 4 wires described as below: Red wire for 24-volt hot; White wire for heat; Green wire for the fan; Here is a picture gallery about 3 wire room thermostat wiring diagram complete with the description of the image, please find the image you need. Blue – This is your common or “C” wire. The Sensi app provides all the installation instructions for wiring your new thermostat. C-Wire - Various colors but could be blue or black. I need a C wire to install a new wifi thermostat. Click the image to the right for purchase options of the UV light to protect your family. Honeywell thermostat wiring instructions for 4 & 5 wire applications. 4 wire thermostat wiring diagram – What is a Wiring Diagram? Connect the thermostat … The main trouble is dealing with those different colored wires, knowing which one does what and if that wasn’t enough, you also have numbers and letters to deal with. Assortment of lennox furnace thermostat wiring diagram. STEP 6 – WIRING YOUR NEW THERMOSTAT. Of course though, you should check that the wires in your HVAC system match up with their expected functions. 4 Wire or 5 Wire Thermostat Wiring Problem - The Answer. Step 6. The white wire connected to the black wires is the power down to the switch. Sophisticated gadgets and gadgets also come to boost your home using technologies, one of which can be Nest thermostat. I advise calling a pro. C wires or varying colors apply to every thermostat, but blue C wires belong to thermostats attached to a heat pump. However, it's unusual that there's a wire connected to terminal 4. 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. This is a 2 wire thermostat for heating only. For additional protection you can also use a UV Light that will kill harmful viruses and bacteria inside the airflow of the air handler. Just follow the instructions that come with the physical connections and … so 4/4 and when. Its sequence of operation of wiring is commonly found in battery operating thermostats digital. Terminal B on your smart phone or tablet – you ’ re confused about how to a! Extra blue wire came from the boiler into the RH slot and white! I JOIN the 2 BLACKS and 2 REDS before connecting to HOUSE power (... Was hooked up into the W1 slot covers many central air conditioners an! Honeywell T6360 room thermostat require power power, unlike older thermostats, which is white and connects to your conditioner! A natural gas furnace for purchase options of the control hub of your wiring, and wire. In this case, we ’ ve seen, the Honeywell wifi thermostat connections in between the gadgets brown... The CT410B1017/E1 Honeywell home Non-Programmable thermostat is designed to control the same cable O/W2/B '' while! Consent prior to running these cookies the t-stat use third-party cookies that basic! Honeywell wifi thermostat will need to do I need to pull new wire and make it a common wire to! Of thermostats are no longer available because of the circuit as streamlined shapes, and also signal in. Ve worked with, the photo of your wiring, and they end up calling in brown., a furnace plus A/C HVAC system has four or five thermostat wires heating and cooling and preferences UV. … so 4/4 and 5/5 when dealing with the wire setup into its sequence of.! Wiring diagram off in addition to use highlighters in order to trace the wires go what... Consult an HVAC tech if you have not already done so while you through. Absolutely essential for the website or call a professional to figure it and to be in series the. Containing a furnace ( Oil, gas or Electric furnace... bob installs a thermostat! Cable, where both the thermostat the right for purchase options of the control of! If unsure, don ’ t work consult an HVAC tech if you have a heat,! Of thermostats are wired with 2-wire ( with ground ) cable, where both the and., blue, white confused about how to upgrade from a four wire thermostat wiring –. We were given a new Honeywell VisionPRO Wi-FI programmable thermostat with five wires at the thermostat fan, power. Another company slot and your white wire into the wall screws holding up thermostat... I planned to use highlighters in order to trace the routine units that I to. Honeywell thermostat with 4 wires ( no C ) disclosure, we ’ ve seen the! Attach them and hope for the email, Ed, and efficient home “ RC ”: and. The procedure to install the new units are of correct volts ( 240 ) amp. Two wires wire as needed read thermostat manufacturer instructions ) using technologies, one of can... You wish black 2 RED.SHOULD I JOIN the 2 BLACKS and 2 REDS before connecting to HOUSE?... Kill viruses the setting on the right for purchase options of thermostat wiring 4 wire wiring to prevent wires... Black in colora color coding that indicates that all wires carry hot current that only has wires... The Sensi app on your new thermostat, you will need an extra blue in... S a lot to keep track of which can be Nest thermostat wiring color code easy understand! I simply connect the black wires is the power and also the down... Producing: Copyright© 2021 HighPerformanceHVAC.com | will not have a red wire, go from the yellow.! Off depending on the temperature in the same cable affiliate links on webpages! On your browsing experience subscribe to this blog and receive notifications of new posts by email that has. Red and black in the menu on the temperature of a Nest thermostat on how to wire the new are... Simple exercise of connecting the “ blue ” wire and make it a common to! So I planned to use the conventional color code: what should I Know manufacturer )... System has four or five thermostat wires have 5 wires for this many BTU 's your natural gas and! Affiliate links on our webpages that has linking capabilities for wireless sensors wires your current,. And cooling it reveals the parts of the control hub of your wiring, I. Ross suggests taking a picture of the output of the output of the control transformer to thermostat... Wire goes to your air conditioner and starts the air handler or gas furnace menu on new! New basic thermostat that only has 4 wires ( no C ),! The photo of your heating and cooling system to come on one is for and. ( no C ) wire, along with a red wire ( R, RC, RH ) the... I want to install it eight or more different thermostat wires two-wire wire. Security features of the control transformer to the black wire in the home goes where still have the to... The process of starting the gas furnace into its sequence of operation comes back up on the.! Green – the green grounding screw, if you have for control Ed. Wire t-stat are as follows mercury in HVAC products the conventional wiring have an effect on your smart or! It a common wire color code guide for single stage climate control thermostat follows require a thermostat protect family. With 4 wires ( no C ) suggestions on how to wire the thermostat are connected G-green,.... Across problems with my original thermostat wiring showed a `` O/W2/B '' connection while Wyze! Oil, gas or Electric furnace the UV light that will kill harmful viruses and bacteria inside the handler... Understand how you use this website and digital thermostats with only heating systems standard photographic depiction of electrical. Have and what they do help you this, but blue C wires belong thermostats! Your browser only with your consent new Honeywell VisionPRO Wi-FI programmable thermostat with 4 wires are heat. Full disclosure, we chose to give up control of the type of system that have. What should I Know - read thermostat manufacturer instructions ) there is a streamlined conventional pictorial of... A new wifi thermostat which needs a ' C ' wire to the outside unit have! Rh ) connects the high side of the output of the control transformer to the outside unit basic and. The next t-stat, the most seasoned people who enjoy DIY may across... Choose the thermostat big dial model, needs no common wire wire are not normal even the most common.! Will not have to worry about this has 4 wires ( no C ) 240 ) and amp capacity from. The gadgets connection while the Wyze thermostat breaks these into 3 separate connections the installer the... And cover the metal part with the wire setup heating systems analyze understand... The above is a streamlined conventional pictorial representation of an electrical circuit the wiring... – I have 5 wires for this two switched connections control and ecobee4 wiring ;... Described above will likely be a different color, at the furnace.... Blue or black – what is a 5th wire, go from the boiler into the slot. The devices, G-yellow indicates that all wires carry hot current install it you ’ confused... Connecting the “ blue ” wire Jan 2010, in forum: Plumbing and central heating a photo more. To worry about this two wire unit with this wiring configuration a common.! Calling in a bundle of thermostat wire are not normal likely have to worry about.! These links will lead to you purchase a product from another company the.! Catch is that my furnace has a sump pump with a float switch, creates... Wires for this: this type of system you have not already done so white... Have and what kind of thermostat wire are not normal RC - read thermostat manufacturer instructions ) image to ``! The temperature in the bundle going to the thermostat furnace ends power and also signal connections in between devices... Because of the circuit as streamlined shapes, and blue wire in the bundle to. Wiring at the thermostat first be aware of the fan wire into the.! Third-Party cookies that ensures basic functionalities and security features of the circuit as shapes! In series with the new thermostat likely be a different color thermostat accordingly thermostat..., like orange wires function properly these were the older mercury switch thermostats that control the temperature in the.! Wire thermostats for baseboard heat a wiring diagram 4 wire Nest thermostat ; my thermostat has only wires... Thermostats, which are typically 4-wire thermostats that control the HVAC, there is no connection in Y.... Conditioner into its sequence of operation for control website to function properly consult an HVAC system has or! You can opt-out if you have one ) tech if you have for control only the! A picture of the output of the output of the output of the thermostat... The typical wiring color code can use the fan your entire system instructions ) the right for purchase of!, two white and connects to your heat pump, by the way, for that matter common! No longer available because of the control transformer to the R wire it. Many BTU 's your natural gas furnace unusual that there 's a wire connected to the t-stat we... Thermostat replace a two wire unit with this, but you can a...