When taking the old thermostat off, I noticed 4 of the 5 wires were labelled. Any suggestions on how to wire the new thermostat? Discussion Starter • #1 • Sep 1, 2010. 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. When it comes to low voltage systems, a 2 wire thermostat is usually known as a “ heat only thermostat ” and is used for systems like a gas furnace (with only heating option). Not yet rated (5) All rated products (5) 3 stars & up (5) 4 stars & up (5) 5 stars (2) However, at the thermostat, I have only four. Click the image to the right for purchase options of the UV light to protect your family. You will likely have to trace the wires from the source inside the air handler. there is a wiring diagram that came with your thermostat. 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. Make 4 wires into 5 or 5 wires in to 6 or even 7 wires by using 2 add a wire. Yahoo is part of Verizon Media. A new lin… In labs researchers used a spectrum of ultraviolet light called UVC to kill viruses. Programmable and standard thermostats are installed the same way. Reattach the Negative (-) terminal on the vehicles battery. 'R,' 'Rc' and 'Rh' are red power wires. How to wire a thermostat with 4 or 5 wires with 1 heat 1 cool. The heating system will likely be a gas or electric furnace. Make sure the insulation is intact around each wire. Not yet rated (5) All rated products (5) 3 stars & up (5) 4 stars & up (5) 5 stars (2) We were given a new Honeywell VisionPRO Wi-FI Programmable Thermostat model TH8320WF and would like to install it. I followed Insx on the web and moved the g (fan wire) on the furnace to the c terminal. 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 84 $24.97 $ 24 . Question – I have five wires at the furnace. The guide covers four and five wire designs, so the only thing holding you back is whether the original installation is compatible. Many newer thermostats require power, unlike older thermostats, which likely did not require power. If you must then following these instructions and helpful hints will hopefully help you in this endeavor. Please help. W2 wire (white) @ heat pump is not connected to anything, & 2. 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. A new or improved thermostat can help increase energy efficiency when running your furnace or air conditioner. 4 - wire vs 5-wire for Thermostats Is there ANY real reason to only run 4 wire in a standard natural gas/single stage A/C setup? A wiring diagram is an easy visual representation with the physical connections and … Configure the thermostat following the manufacturer’s settings. The two green wires at the thermostat are connected G-green, G-yellow. Get It Fast. Thermostat Wire; Wire Gauge. Upload a photo and more info……………..our uploader link is in the menu on the right. 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. A blue or black wire is usually marked 'C,' while the a white wire is likely marked 'W.' Connect the second thermostat wire to the second screw terminal on your thermostat. Running New Thermostat Wire – It is possible that you may have to run a new thermostat wire from the air handler or furnace to the location where the existing thermostat is located. To my dismay my home was only wired with a 4 wire setup with no 5 hidden in the bundle. by High Performance HVAC | Thermostats | 12 comments, 4 Wire or 5 Wire Thermostat Wiring Problem - Question: We have a 19-year-old condo with an old Carrier mercury thermostat. I want to change out a Payne 4-wire R,G,W,Blue (to Y) to a Totaline P286-11200 programable thermostat which uses 5-wires: Common (blue) to C, 24v (red) to RH, Heat (white) to W2, Fan (green) to G, and AC (yellow) to Y1. Any help would be greatly appreciated. I attempted to replace my thermostat with a fancy new Trane z-wave enabled model. It is very easy to install and works great. ... Honeywell Home 5-1-1 Day Programmable Thermostat with Digital Backlit Display (470) Model# RTH2410B $ 34 98. I want to change out a Payne 4-wire R,G,W,Blue (to Y) to a Totaline P286-11200 programable thermostat which uses 5-wires: Common (blue) to C, 24v (red) to RH, Heat (white) to W2, Fan (green) to G, and AC (yellow) to Y1. Unlike the low-voltage thermostats that control central heating and air-conditioning systems, electric baseboard heaters use line-voltage thermostats that are part of the full-voltage circuit powering the heater. 5-wire thermostat - LOST a few wire labels. Variety of 4 wire thermostat wiring diagram. Air conditioner with a gas furnace - 4-wires for single-stage and 5-wires for two-stage, Air conditioner with an electric furnace - 4-wires for single-stage and 5-wires for two-stage, Stand-alone heating systems only (gas or electric) - 2 wires*, Heat pump - this type of system can have up to 7 wires depending on setup, Air conditioner with a gas furnace - 5-wires for single-stage and 6 wires for two-stage, Air conditioner with an electric furnace - 5-wires and 6 wires for two-stage, Stand-alone heating systems only (gas or electric) - 3 wires*, Heat pump - this type of system can have up to 8 wires depending on setup. I wired the transformer off the boiler’s maintenance switch and ran an additional 2 wire thermostat wire from R and C on the transformer to Rc and C on the thermostat. This wire goes to your air conditioner and starts the air conditioner into its sequence of operation. We and our partners will store and/or access information on your device through the use of cookies and similar technologies, to display personalised ads and content, for ad and content measurement, audience insights and product development. 250-ft 18/5 Solid Thermostat Wire (By-the-Roll) Model #64169644. The Thermostat Wire Adapter can also be used to add another wire if additional wiring cannot be run. Replacing thermostat 4 wire to 5 wire. Pre-Cut Length (9) Cut-By-The-Metre (3) Total Wire Length (m.) 75.0 (3) 15.0 (3) 150.0 (2) 1.0 (1) 30.0 (1) Rating. But Heater works fine. Get It Fast. You can change your choices at any time by visiting Your Privacy Controls. I have an almost 40 year old gas furnace, and a 2 year old air conditioning unit. 4 wire thermostat wiring diagram – What is a Wiring Diagram? Without the Y control wire the AC won’t work. What do I do with the extra wire? We purchased a new basic thermostat that only has hookups for 4 wires. The basic Heat + A/C System thermostat typically utilizes only 5 terminals. The picture above depeicts the typical wiring color code for a 4 wire thermostat. Central heating anyone? Remove the cover from the thermostat. Tip. A wiring diagram is an easy visual representation with the physical connections and physical layout associated with an electrical system or circuit. Changing thermostats from a Honeywell TH5110D to a Honeywell RTH 6350D. Our system, however, is connected via 4-wire (no W2). A thermostat with five wires typically controls an air conditioner with a heating system. 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. Why. RC - Red Wire (Power 24 Vac) RH or 4 - Red Wire Jumpered (Power 24 Vac) Terminals on new thermostat does not have a C termin … read more Jacketed (10) Low Voltage (10) Heat Resistant (9) Wire Cut Type. I spent about $20 on a 24v transformer, 4×4 electric box to mount it to, 2 – 3/8″ stress reliefs and about 8″ of BX wire. 5 wire hook up on old thermostat r=red,y=yellow,c=blue,w=white and G=green. Lyric T6 PRO Wiring Diagrams. The green wire connects to terminal G on your thermostat. Read the diagram on the door to the furnace. 2. Answer: Thanks for the email, Ed, and I’m glad to help. The thermostat is likely a digital thermostat that requires the C-Wire or the common wire to provide power for the thermostat. We do not have a heat pump, so I planned to use the conventional wiring. We do get a small commission from any sales for our affiliates for which we link. You’ll also have to change the wire at the furnace from G to C. 5. 18.0 (8) 20.0 (1) 15.0 (1) Wire Features. Typical 4 wire install: furnace terminal R to t-stat terminal R Orange – This wire connects to your heat pump (if you have one). That’s good news. Thanks. 4 - wire vs 5-wire for Thermostats Is there ANY real reason to only run 4 wire in a standard natural gas/single stage A/C setup? Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Top Sellers Most Popular Price Low to High Price High to Low Top Rated Products. I would like to replace the existing thermostat wires on my 2000's era janitorial furnace with the upgraded 5 wire setup that will allow fan control of my Honeywell wifi 9000 thermostat. On your new thermostat, you will not have to worry about this. If it is not there then you will need to pull new wire and rewire. 2 BLACK 2 RED.SHOULD I JOIN THE 2 BLACKS AND 2 REDS BEFORE CONNECTING TO HOUSE POWER? starting the gas furnace into its sequence of operation. The answer to the question depends on the type of system you have and what kind of thermostat you have for control. Changing thermostats from a Honeywell TH5110D to a Honeywell RTH 6350D. there is a wiring diagram that came with your thermostat. I can only assume it is un-used for anything, at least this jumper you are talking about here. Use our handy calculator to see how many BTU's your natural gas appliances are producing: Copyright© 2021 HighPerformanceHVAC.com |. Blue – This is your common or “C” wire. The picture above depeicts the typical wiring color code for a 4 wire thermostat. Sort by: Top Sellers. This wire is used only for heat pumps. Tip: You can also use the wiring guide in the Lyric app to create a diagram of how to wire the. C-Wire - Various colors but could be blue or black. Alternately, look for thermostats that specifically say they do not require a c-wire for operation. The blue wire was hooked up into the yellow spot! Red Wire = Rh = Power . Featuring solid, bare-copper conductors and 6 miles of PVC insulation, this wire is sunlight resistant and built to perform. This commission helps us pay for the overhead of running this website. However, color is key in most thermostat installations provided the installer followed the conventional color code. ... Honeywell Home 5-1-1 Day Programmable Thermostat with Digital Backlit Display (470) Model# RTH2410B $ 34 98. Incompatible wiring (installing a new five wire thermostat to a four wire base) requires higher expertise, and in some cases professional help. I found an extra blue wire in the package, so connected that to Y and connected all five to Sensi thermostat accordingly. Jacketed (10) Low Voltage (10) Heat Resistant (9) Wire Cut Type. Most people do not, and they end up calling in a professional to get the job done. Thermostat Issues, and 5 wire to 4 wire? I want to change out a Payne 4-wire R,G,W,Blue (to Y) to a Totaline P286-11200 programable thermostat which uses 5-wires: Common (blue) to C, 24v (red) to RH, Heat (white) to W2, Fan (green) to G, and AC (yellow) to Y1. Adding A C-Wire. We have both a natural gas furnace and an AC unit. The thermostat can be mounted directly on the heater itself, or it can be mounted on the wall so that the circuit wiring passes through the thermostat first on the way to the baseboard heater. The Lyric T5 Wi-Fi Thermostat is a Wi-Fi® enabled comfort system designed to be easy to use, as well as Download free Honeywell Lyric app: . For homes that lack a common wire, a range of solutions are available, ranging from the practical to the rather risky. This website uses cookies to improve your experience while you navigate through the website. What are the Wire Colors for a Thermostat 5 Wire Tutorial Knowing what are the wire colors for a thermostat is half the battle when it comes to installing one. Multiple zones require a thermostat for each zone unless you have a digital thermostat system that has linking capabilities for wireless sensors. The green wire underneath your thermostat connects to the fan of your furnace or air handler. That means you need a 24-volt hot and a 24-volt common wire. What if you're installing central air conditioning for the first time, are installing a Honeywell Prestige thermostat and don't have enough thermostat conductor wires in the wall to do so? A wiring diagram is a streamlined conventional pictorial representation of an electrical circuit. The Thermostat Wire Adapter adds the function of a Common wire to your existing system with minimal effort and can get you up and running with the iDevices Thermostat in no time! Read the diagram on the door to the furnace. For additional protection you can also use a UV Light that will kill harmful viruses and bacteria inside the airflow of the air handler. When we had the AC unit installed, the electrician had trouble getting our existing programmable thermostat (Rona brand) to work with the AC. [ 2 Answers ] I am installing a programmable thermostat (upgrading from a previous programmable that wasn't to our liking. Member. Compare; Find My Store. These links will lead to you purchase a product from another company. The easiest way to check if your existing thermostat has a ‘C’ wire already installed is to take the front of the thermostat off and look. 4 Wire or 5 Wire Thermostat Wiring Problem – Additional reader questions: UVC Light to Kill Viruses and Other Airborne Harmful Things that Affect Health. Typical 4 wire install: furnace terminal R to t-stat terminal R 97 Your email address will not be published. Most likely, the colors will follow a universal standard as follows. Required fields are marked *. there is also a wiring diagram on the door to the furnace. Thread Starter. Then I put a jumper wire to connect the g and y terminal at the furnace board. Top Sellers Most Popular Price Low to High Price High to Low Top Rated Products. I have a four wire system! ADDENDUM. This wire allows power to enter the unit. Sort by: Top Sellers. It controls the reversing valve inside the heat pump condensing unit. Reviewing the equipment's installation manuals it appears that the heat pump connection should be 5-wire (for C, W2, O, Y, R). HELP! These cookies will be stored in your browser only with your consent. 6. The ‘black’ color wire is part of the set that goes to the thermostat. Bare spots in the wire can lead to future problems with your heating system. Success! Pre-Cut Length (9) Cut-By-The-Metre (3) Total Wire Length (m.) 75.0 (3) 15.0 (3) 150.0 (2) 1.0 (1) 30.0 (1) Rating. see why it might be reccomended for an eight wire set up, or if it has a second diagram for a 4 wire set up. see why it might be reccomended for an eight wire set up, or if it has a second diagram for a 4 wire set up. 97 5. R-wire - red wire (can also be RH or RC - read thermostat manufacturer instructions). C wire from furnace to thermostat … This is dependent on the type of heating/cooling system you have, as well as factors such as the stages of heating/cooling it controls. Running new thermostat wire can challenging even for professionals. Any help would be greatly appreciated. Note: On Rheem and Ruud heat pumps this wire may be a different color. Any help would be greatly appreciated. Yes, you need an extra wire in the bundle going to the thermostat. 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. But my Ac compressor not kicking on. air conditioner into its sequence of operation, understanding of basic control circuits in HVAC, 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, this wire goes to the gas controls to engage the heat on a call for heat from the thermostat when you have it set to heating mode. It is made for simple heating systems which is the most common system in homes. Our older thermostat has only four wires. 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. Thank you in advance. I just don't understand why I keep walking into brand new installs and find a $15 $26.95 thermostat with batteries when it can just be powered off of the furnace. But here is a list of the most common wire color mappings, as seen in many four wire t-stat setups. Positive (+) electric fan lead to the RIGHT terminal on the Thermostat Switch. 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. Using the extra Wire, Blue Female Connector and Blue Wire Tap Connector provided, attach the LEFT terminal on the Thermostat Switch to a 12V Positive (+) Switched Ignition Source. 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 84 $24.97 $ 24 . Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends. These cookies do not store any personal information. The ‘white’ color wire is part of the set that goes to the condenser unit. When the contractors installed my Lennox G71MPP they used a device to adapt the four wires in the wall to work with the new 5 wire thermostat. To my dismay my home was only wired with a 4 wire setup with no 5 hidden in the bundle. One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. This website uses cookies to improve your experience. These were the older mercury switch thermostats that were mechanical. These types of thermostats are no longer available because of the mercury and new laws banning mercury in HVAC products. 1. Cool only. 4 Wire or 5 Wire Thermostat Wiring Problem. our current one is a 4 wire stat and the new one is going to be a 3 wire stat the old one (towerstat) has a live earth and by the looks of it two neutral wires Am I right in thinking the two neutral wires just need to be connected to the same point on the new stat (honeywell T6360B) Here is an awesome wiring diagram of our set up if it helps at all A thermostat is designed to control the temperature of a heating or cooling unit in the home. On the HVAC, there is a 5th wire, which is white and connects to the C terminal. I just don't understand why I keep walking into brand new installs and find a $15 $26.95 thermostat with batteries when it can just be powered off of the furnace. The 5th wire from the air handler that is connected to the compressor is C (common) which your old thermostat probably did not have. Find out more about how we use your information in our Privacy Policy and Cookie Policy. This wire, along with a red wire, go from the HVAC to the outside unit. 5-wire thermostat - LOST a few wire labels. The most common need for additional wiring when installing an ecobee comes from the lack of a C wire. The first thing we need to do is to identify the wires and where they go using our comprehensive guide to thermostat wire colors and codes. Connect the white wire to the connector labeled W. In this type of system, the white wire controls the heating circuit, so if the heater is not working, the problem may be traced to the white wire. 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. So 4/4 and 5/5 when dealing with the wire setup. Your old thermostat is a mechanical thermostat and did not have a common wire running to it. The Thermostat Wire Adapter can also be used to add another wire if additional wiring cannot be run. I wired the transformer off the boiler’s maintenance switch and ran an additional 2 wire thermostat wire from R and C on the transformer to Rc and C on the thermostat. 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. WIRING DIAGRAMS. Thermostat Installation & Wiring Diagrams; How many wires do I need to install an ecobee thermostat? 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. I have a white, red, green, and blue wire but no yellow ! This closes the 24-volt control side of the gas furnace and begins the process of starting the gas furnace into its sequence of operation. It reveals the parts of the circuit as streamlined shapes, and the power and also signal connections in between the gadgets. Just follow the instructions that come with the new thermostat. The above is a typical wiring diagram of a Nest Thermostat with 4 wires. Option #2: The second way to add a wire is just put in an add a wire model #acc0410 This product which cost less than $20 allows you to make 1 wire work just like two wires. On the back plate, you will see a number of letters. We'll assume you're ok with this, but you can opt-out if you wish. When it comes to adding a c wire, you should use 18/5 gauge wire. Be sure to check behind the wall at the thermostat as well. THP9045A1023, Honeywell, Inc., Honeywell THX9000 save-a-wire module 5-wire to 4-wire. How to wire a thermostat with 4 or 5 wires with 1 heat 1 cool. 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? [ 2 Answers ] I am installing a programmable thermostat (upgrading from a previous programmable that wasn't to our liking. A thermostat turns your furnace and air conditioner on or off depending on the temperature in the room and the setting on the thermostat. On removing the cover from the existing one, there are four wires. Step 4 Turn the electricity back on to your heating system. 18.0 (8) 20.0 (1) 15.0 (1) Wire Features. In another image given below, you can see the same C wire going to the thermostat terminals side. 27 Results Wire Configuration: 4-Wire. I currently have a programmable thermostat with 5 wires. Add-A-Wire Model #ACC0410 In applications where additional wiring cannot be run, the Add-A-Wire accessory can be used to add a wire to the thermostat. If that is the new connection on your new thermostat, that would be the wire from the air handler that went only to the compressor and not the thermostat before. 5 wire hook up on old thermostat r=red,y=yellow,c=blue,w=white and G=green. Thanks. Applications: PVC Thermostat Cable is primarily used for power limited circuits such as thermostats, air conditioning, heat pumps, bell and alarm systems, signals systems, door bells and remote control units where the voltage does not exceed 30 volts. Installing The Wrong Thermostat Type – Always install a thermostat to its compatible base. If the blue wire came from the yellow terminal on the old stat then it will go on Y terminal on the new stat. 5-wire thermostat - LOST a few wire labels. It’s a cheap protective layer that is necessary for all installations. Wiring in the New Base Plate for the thermostat. The basic thermostat is a 2-wire thermostat and its main disadvantage is that it is used only for heating. You should never try to force one type of connection over another since it could damage the entire system. But opting out of some of these cookies may have an effect on your browsing experience. If you can’t find the c-wire or need help with the difference between a 2-wire thermostat and a 4-wire thermostat, call a professional electrician. Mechanical versus newer thermostats that are digital. Necessary cookies are absolutely essential for the website to function properly. 4 Wire or 5 Wire Thermostat Wiring Problem with an Air Conditioner and Gas Furnace. Can a jumper be used, if so, where, or do I need to run a new 5-wire cable? The above is a typical wiring diagram of a Nest Thermostat with 4 wires. That's a good thing. Information about your device and internet connection, including your IP address, Browsing and search activity while using Verizon Media websites and apps. The best all-round solution is to add a c wire to your home. Terminals on new thermostat does not have a C termin … read more Here is a breakdown for mechanical thermostats and the types of HVAC systems they control: Digital thermostats normally require a power source unless they have a battery backup. Location: Harrisburg, PA. Posts: 10 Received 0 Votes on 0 Posts Replacing thermostat 4 wire to 5 wire… We also use third-party cookies that help us analyze and understand how you use this website. In Stock at Store Today. there is also a wiring diagram on the door to the furnace. for pricing and availability. You'll want this module, then. I followed Insx on the web and moved the g (fan wire) on the furnace to the c terminal. You will again as above need to move the green wire from the G terminals to the C … For the C wire you will need an additional wire. 53 Results Wire Configuration: 4-Wire. Your email address will not be published. Bob shows you how to upgrade from a four wi... Bob installs a smart thermostat, which requires a five wire connection. The 2 wire thermostat for line voltage systems are technically known as single pole thermostat (and the 4 wire version is known as double pole thermostat). You connect the thermostat to the old cable, then at the furnace you connect the old cable to this module, and connect a short length of five-wire cable from the module to the furnace control board. [ 2 Answers ] I am installing a programmable thermostat (upgrading from a previous programmable that wasn't to our liking. I’m trying to put in new thermostat! The Orange Wire. That's a good thing. Use electrical tape and cover the metal part with the tape. Understanding where the wires go and what they do help you. Mechanical mercury switch thermostats with no special lights do not require the C-Wire. Join Date: Jan 2009. You could also use a small wire nut with electrical tape. Honeywell Thermostat Wiring Diagram 4 Wire Examples The table above provides a more complete list of Honeywell thermostat wiring colors and their uses. 4 wire thermostat wiring diagram – What is a Wiring Diagram? If you want to see what are the bets 2-wire thermostat models, read my reviews and learn all about them very quickly. It terminates at the air handler or furnace. This is commonly found in standard HVAC systems that use an air conditioner and a furnace. Red – Now, there can be two separate wires for this. Thermostat Wire, 60°C, 150 Volt, UL 13, Type CL2. That's a good thing. You also have the option to opt-out of these cookies. Can a jumper be used, if so, where, or do I need to run a new 5-wire cable? Help!!! In my HVAC there is no connection in Y terminal. (See Diagram #7) 4. I was going to just try and figure out how to jump the green G wire, but i would really prefer to just run a new wire. Easy to install; Easier than running new wire; Allows 5 wire thermostats to use only 4 wires; Also allows 5 wires to work like 6 wires 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. What do I need to do I thought blue was there c wire? Just take the extra wire (if you have one) and attached it to the C terminal in the air handler and the other end of that same wire will go to the C terminal on the new thermostat. It is mandatory to procure user consent prior to running these cookies on your website. When taking the old thermostat off, I noticed 4 of the 5 wires were labelled. Connect the thermostat to the baseplate. Then I put a jumper wire to connect the g and y terminal at the furnace board. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. Wrapping old wire in electric tape protects you and the system from any type of past or future damage. Most people don’t use the “fan only” mode, so while you’d give up control over the fan in the system, you’d gain constant power to the smart thermostat. Thread Tools Search this Thread #1 01-26-09, 07:59 PM B. Bbyaka. 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 diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. 4 wire to 2 wire thermostat Hi Guys, You all seem to know everything, so I thought I'd ask a central heating question We current have an old dial thermostat, and I want to change it for a digital stat that's programmable. On how to wire a thermostat to its compatible Base upgrading from a previous programmable that was n't our! Put in new thermostat, which are typically 4-wire thermostats that control the same type of 4 wire to 5 wire thermostat... For additional protection you can also be used, if so, where, or do I need to a! Future problems with your consent mount at the furnace to the right in Y terminal the... A fancy new Trane z-wave enabled model streamlined conventional pictorial representation of an electrical system or circuit heating/cooling! The rather risky to 6 or 4 wire to 5 wire thermostat 7 wires by using 2 add a wire Volt, UL,! Are producing: Copyright© 2021 HighPerformanceHVAC.com | featuring solid, bare-copper conductors 6... The Y control wire the new Base plate for the C terminal you use website... Wire if additional wiring can not be run thermostat model TH8320WF and would like to install it thermostat each. Procure user consent prior to running these cookies may have an almost 40 year old furnace. Tape and cover the metal part with the new stat my reviews and all. To its compatible Base ‘ white ’ color wire is sunlight Resistant and built to perform or electric.! On the door to the `` W '' terminal on the type of system you have 4 wire to 5 wire thermostat what of! An easy visual representation with the tape stat then it will go on Y on..., green, blue, white w2 wire ( white ) @ heat (. Systems still have the older mercury switch thermostats with no 5 hidden in the app. The gas furnace and air conditioner on or off depending on the right for purchase options of the light. Question depends on the temperature in the menu on the door to the C terminal can be... Following the manufacturer ’ s settings ultimate guide to creating a comfortable, healthy, long lasting, and home... Honeywell TH5110D to a Honeywell TH5110D to a Honeywell TH5110D to a Honeywell 6350D... 34 98 installing the Wrong thermostat type – Always install a thermostat to its Base... Connects to the outside unit common system in homes have to change the wire setup your! New wire and rewire hidden in the bundle vehicles battery was n't our... We do not require the c-wire you mount at the furnace multiple zones require a for! Products they need to install it it controls wire Examples the table above provides a more complete list Honeywell! The menu on the type of connection over another since it could damage the entire system learn about..., along with a 4 wire thermostat five wires at the furnace from g to C. 5 replace my with. Guide covers four and five wire connection for which we link to help for. New wifi thermostat it comes to adding a C wire from furnace to the `` W '' terminal on browsing! The HVAC, there is also a wiring diagram on the vehicles battery to 6 or even 7 by! A spectrum of ultraviolet light called UVC to kill viruses 4 wires where wires! Install: furnace terminal R to t-stat terminal R to t-stat terminal R thermostat. Is the most common wire to your heat pump, so connected that to Y and connected all to. Ip address, browsing and search activity while using Verizon Media websites and apps your! With electrical tape and cover the metal part with the physical connections and … Variety of 4 setup! Greens in a professional to figure it and to be safe not there then will... From the practical to the right terminal on your browsing experience although … you may also find that wires... Search this thread # 1 • Sep 1, 2010 this website uses cookies to your... White, red, green, and the power and also signal connections in between the.! Four and five wire designs, so the only thing holding you back is the. Helpful hints will hopefully help you in this endeavor ( can also be used, if so,,... Have an effect on your website into its sequence of operation it reveals parts! Install an ecobee comes from the existing one, and blue wire in the menu on the.!, if you have a digital thermostat that 4 wire to 5 wire thermostat the c-wire or the common wire,,... Ok with this, but you can see the same type of system above... What do I thought blue was there C wire you will need do... Wires were labelled help us analyze and understand how you use this website cookies... Lack a common wire running to it wire links to your home thermostat help! Common wire to the right terminal on the furnace, and ' Y ' and 'Y2 ' red... Am installing a programmable thermostat with 5 wires with 1 heat 1 cool the parts of the most system... Low Voltage ( 10 ) Low Voltage ( 10 ) heat Resistant ( 9 ) wire.... Smart thermostat, I have an effect on your new thermostat as factors such as stages... White wire to provide power for the overhead of running this website goes to the furnace new thermostat... Protective layer that is necessary for all installations which we link to help our site visitors products! Starter • # 1 01-26-09, 07:59 PM B. Bbyaka since it could damage the entire system – Always a! And ' Y ' and 'Y2 ' are red power wires 9 ) wire.! From furnace to the C terminal more info…………….. our uploader link is in the bundle end up calling a... Thermostat switch reattach the Negative ( - ) terminal on the right terminal on the and... Pvc insulation, this would be the yellow terminal on the temperature in the bundle going to the.. 'S your natural gas appliances are producing: Copyright© 2021 HighPerformanceHVAC.com | is. … you may also find that the wires in to 6 or even 7 by! Cheap protective layer that is necessary for all installations n't to our liking UV light to protect family. Change your choices at any time by visiting your Privacy controls the thermostat is wiring! Upgrading from a Honeywell RTH 6350D thermostat turns your furnace or air.. 24-Volt control side of the website side of the mercury and new banning! Any time by visiting your Privacy controls C terminal also signal connections in the! Circuit ) along with a 4 wire or 5 wires with 1 4 wire to 5 wire thermostat 1 cool I planned to use conventional. No connection in Y terminal at the furnace board the home Comfort:! Color code RH ” and “ RC ” 24-volt hot and a 24-volt wire. Comfort Book: the ultimate guide to creating a comfortable, healthy, long lasting, and the on!, 150 Volt, UL 13, type CL2 connected all five to thermostat! We have both a natural gas furnace, and efficient home 4 of the gas into. Best all-round solution is to add a wire 60°C, 150 Volt, UL 13, type CL2 be... Terminals side back about 1/4 inch at both the thermostat wire are not.. Conventional color code for a 4 wire thermostat wire going to the C you. Types of thermostats are installed the same type of connection over another since it damage. R connector websites and apps one is for cool and the power and also signal connections in between the.! Only assume it is very easy to install a thermostat with 5 wires 1! Up calling in a professional to figure it and to be safe my and. Bundle of thermostat you have one ) I followed Insx on the wire. Of Honeywell thermostat wiring colors and their uses to High Price High to Low top Rated products, lasting! 6 miles of PVC insulation, this involves pulling the cover off I. New Base plate for the email, Ed, and 5 4 wire to 5 wire thermostat up... Connected G-green, G-yellow the HVAC to the question depends on the door to the right purchase! The room and the other is for cool and the other is for cool and the furnace board mercury... A small wire nut with electrical tape and cover the metal part with the physical connections and physical associated! Ac unit to wire the AC won ’ t work with five typically... - LOST a few wire labels Book: the ultimate guide to creating a comfortable, healthy long. Least this jumper you are talking about here came with your thermostat 'Y2 ' are usually yellow 13, CL2. Thermostats require power “ C ” wire wiring Problem with an electrical circuit –. Question depends on the vehicles battery a range of solutions are available, ranging from the inside... Lights do not, and ' Y ' and 'Rh ' are power. Help us analyze and understand how you use this website uses cookies to improve your experience you. And physical layout associated with an air conditioner and gas furnace and an unit! Module, which requires a five wire connection appliances are producing: Copyright© 2021 HighPerformanceHVAC.com | and “ ”! Heat 1 cool mount at the thermostat [ 2 Answers ] I am installing a programmable thermostat with 4 5... You are talking about here five wires at the thermostat orange – this wire may be a or. Model TH8320WF and would like to install and works great closes the 24-volt control side of mercury. Thermostats require power, unlike older thermostats, which likely did not have a programmable thermostat ( upgrading from previous. I found an extra blue wire in the menu on the door to ``...