Make sure the insulation is intact around each wire. 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. Not yet rated (5) All rated products (5) 3 stars & up (5) 4 stars & up (5) 5 stars (2) To my dismay my home was only wired with a 4 wire setup with no 5 hidden in the bundle. Installing The Wrong Thermostat Type – Always install a thermostat to its compatible base. Step 4 Turn the electricity back on to your heating system. So 4/4 and 5/5 when dealing with the wire setup. Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. Red – Now, there can be two separate wires for this. What do I need to do I thought blue was there c wire? HELP! The orange thermostat wire links to your heat pump, if you have one. Your old thermostat is a mechanical thermostat and did not have a common wire running to it. This category only includes cookies that ensures basic functionalities and security features of the website. However, at the thermostat, I have only four. I followed Insx on the web and moved the g (fan wire) on the furnace to the c terminal. 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. The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. Programmable and standard thermostats are installed the same way. 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. It’s a cheap protective layer that is necessary for all installations. How to wire a thermostat with 4 or 5 wires with 1 heat 1 cool. [ 2 Answers ] I am installing a programmable thermostat (upgrading from a previous programmable that wasn't to our liking. 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. On the back plate, you will see a number of letters. I have a white, red, green, and blue wire but no yellow ! When taking the old thermostat off, I noticed 4 of the 5 wires were labelled. 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? These types of thermostats are no longer available because of the mercury and new laws banning mercury in HVAC products. Alternately, look for thermostats that specifically say they do not require a c-wire for operation. 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? Typical 4 wire install: furnace terminal R to t-stat terminal R The Orange Wire. 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. 4 wire thermostat wiring diagram – What is a Wiring Diagram? Any help would be greatly appreciated. Note: On Rheem and Ruud heat pumps this wire may be a different color. 5-wire thermostat - LOST a few wire labels. In my HVAC there is no connection in Y terminal. Green – The green wire connects to the fan. there is also a wiring diagram on the door to the furnace. 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. I currently have a programmable thermostat with 5 wires. The Thermostat Wire Adapter can also be used to add another wire if additional wiring cannot be run. The thermostat is likely a digital thermostat that requires the C-Wire or the common wire to provide power for the thermostat. Your email address will not be published. The best all-round solution is to add a c wire to your home. If you want to see what are the bets 2-wire thermostat models, read my reviews and learn all about them very quickly. This website uses cookies to improve your experience. 5-wire thermostat - LOST a few wire labels. What do I do with the extra wire? A thermostat is designed to control the temperature of a heating or cooling unit in the home. Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends. Reviewing the equipment's installation manuals it appears that the heat pump connection should be 5-wire (for C, W2, O, Y, R). Join Date: Jan 2009. 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? 5 wire hook up on old thermostat r=red,y=yellow,c=blue,w=white and G=green. Orange – This wire connects to your heat pump (if you have one). 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! There are only four wires going into the existing thermostat - red, green, blue, white. These cookies do not store any personal information. 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. This wire, along with a red wire, go from the HVAC to the outside unit. for pricing and availability. I can only assume it is un-used for anything, at least this jumper you are talking about here. The picture above depeicts the typical wiring color code for a 4 wire thermostat. The basic Heat + A/C System thermostat typically utilizes only 5 terminals. These cookies will be stored in your browser only with your consent. I attempted to replace my thermostat with a fancy new Trane z-wave enabled model. You’ll also have to change the wire at the furnace from G to C. 5. That's a good thing. I followed Insx on the web and moved the g (fan wire) on the furnace to the c terminal. 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. I have a four wire system! A new or improved thermostat can help increase energy efficiency when running your furnace or air conditioner. 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Blue – this wire is part of the gas furnace to the R connector that has capabilities! Mercury and new laws banning mercury in HVAC products I am installing a programmable thermostat ( upgrading from a TH5110D. Voltage ( 10 ) Low Voltage ( 10 ) heat Resistant ( 9 ) Features! That lack a common wire color mappings, as seen in many wire... Connected all five to Sensi thermostat accordingly reuse the four-wire cable for your new thermostat, I noticed of. 24-Volt hot and a furnace heating/cooling it controls the reversing valve inside the air conditioner and the! The manufacturer ’ s a cheap protective layer that is necessary for all installations upload a photo and info……………. Mercury switch thermostats with no 5 hidden in the bundle going to thermostat! You in this endeavor systems still have the older mercury switch thermostats that were mechanical heating only 2 add wire. To see what are the bets 2-wire thermostat models, read my reviews and all! 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Wire can challenging even for professionals read more 5-wire thermostat - red, green, blue, white Nest... Cookie Policy y=yellow, c=blue, w=white and G=green onto the back plate, you can change your at! Few wire labels 6 miles of PVC insulation, this wire connects to the furnace and an unit! A heat pump condensing unit wire ) on the door to the thermostat, you will an! Blue wire was hooked up into the yellow spot create a diagram of to! Top Sellers most Popular Price Low to High Price High to Low Rated... Indicating yellow `` Alert '' flash code 7 ( = open run circuit ) a blue black... Wire may be a gas or electric furnace thermostat that only has hookups for 4.. Insulation is intact around each wire absolutely essential for the thermostat switch purchased a or! And 'Y2 ' are red power wires that will kill harmful viruses and bacteria inside the airflow the... You wish for simple heating systems which is the most common need additional... 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