Best Wishes J.Lockard Yeah the wiring looks correct, other than the red/white in the wall. If your thermostat has a short “jumper” wire between two connectors, don’t include that wire; only enter the labels for wires coming from inside your wall that are attached to the thermostat. It only takes a minute to sign up. All that is left is a blower and 9.6kw heating strip. The terminal strips on HVAC control boards are designed to clamp two wires under the same screw, 1 on each side. I provided water bottle to my opponent, he drank it then lost on time due to the need of using bathroom. Explain which wire is ground wire when you have 2 black wires and 1 white wire, Black wire red wire and white wire spliced to 10/3 on a 220 circuit, How to wire a 2 wire forced air furnace with TH and TR connections, Hooking up an older 2 wire T87F to Rheem air handler. Are there any sets without a lot of fluff? I also jumped the red to white wire and heard a click from the furnace but no heat. Explain which wire is ground when you have 2 black wires and 1 white wire. Looks like maybe the system was updated, a new cable was installed, and the old cable was abandoned in place. besides that, everything looks good at the thermostat too. I am installing a Honeywell EIM and it is not powering on. Furnace Thermostat Wiring Diagram Terminal Letters On a Thermostat and What They Control The Hot wire (24 volts) usually Red from the transformer is the main power wire to turn on or off a furnace components. I have a 5 wire thermostat wire coming from my furnace. You'll also notice the C wire just hanging out, which should be either used or capped off. 5 This diagram is to be used as reference for the low voltage control wiring of your heating and AC system. I appreciate any feedback/suggestions you folks may offer. I don't have the C Wire and need to use an adapter. As you can see from my photos, I have connected 4 of the 5 wires, based on the obvious W to W, R to R, etc etc markings. The red and white need to be hooked up to something which is going to close the circuit when heat is … If you see heavy wires or a label indicating "line voltage" or 120-Volts, or 240 Volts, stop right there. R - Return On my furnace, a white wire was attached to the C terminal and then pig tailed to a red wire. AC doesn't work, thermostat is dead. I have a 1961 Gaffers and Sattler furnace, model #90 FEF. Now it's summer. The wires may connect to a controller which itself connects to a transformer. G Wire Change to C Wire. What is the status of foreign cloud apps in German universities? I just installed a digital thermostat. If your thermostat is controlling only a heating system or only an air conditioning system, you will only have a red wire, and a white wire coming form the inside unit, to the outside unit. I want to know how to hook it up. Red (H). By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Connecting the Wires on a Thermostat The gas company was called and I was told that the gas valve needed to be replaced. My air conditioner has only 2 wires red and white. I have tried … I only see three places to hook wires in, labeled: TH, TH-TR, TR. Are "intelligent" systems able to bypass Uncertainty Principle? How should the thermostat wires be connected to my furnace? Strip 1/4-inch of insulation from each end of the 6-inch piece of low voltage wire with a pair of wire … Please view my attached schematic for more detail. Hold onto the wires and don't let them slip back behind the wall. More about Wiring a Thermostat. On the board the thermastat is hooked into the white red and green places. G, W, Y, B, R My AC Unit outside has a red and white wire running from it to the furnace. That's how a … I am almost sure that the reason I do not have the AC Unit kicking on, is due to the 2 wire red and white not being connected. Down at the furnace at the P.C. I have installed a disconnect between my dryer receptable and a tanning bed. Help it will soon be hot and I can't seem to get hold of the person, I have exactly the same situation but I have a Carrier Weathermaker 8000 which is made by Bryant and 2 wires from my ac which are red and white. AC bus fuses intact. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Some Background: I have a Rheem heat pump air handler that used to be in my house and now I'm trying to install it in my shop. Why would merpeople let people ride them? The Rc wire connects to the cooling system. I want to know how to hook it up. I'd investigate where that abandoned cable goes. I have a 5 wire bundle and an additional 2 wire bundle. How do I disable a thermostat to prevent it from turning on the AC? Writing thesis that rebuts advisor's theory. A white wire then is pig tailed to the green, red, and white wires. Red (C). Where can I connect the C wire on the A/C side? W – White White – Heating. The other wire might have been for a humidifier or something in the past. NOTE My thermostat allows control of my by-pass humidifier. Is there logically any way to "live off of Bitcoin interest" without giving up control of your coins? Not that for heating systems there really is no standard for the wire colors, so here is what you are seeing: Red is connected to the oil primary and so is white, this is the basic two wire install. Also I believe the Red wire was connected to the Y terminal and the White wire … How should I save for a down payment on a house while also maxing out my retirement savings? The outdoor unit has a common and one wire for 24v hot. Blue. C and R on the control board are 24VAC. I replaced it with a Robertshaw 7000 ERLC gas Valve. When I turned it on, it told me there was no power to the Rh. I'm an IT Guy and thought "Hey, its electronic, so I can probably figure it out.". The other wire from the outside unit should go to common in your case it is the com24. But without knowing where all the wires go, there's no way to be sure. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. You should also cap off the black wire at the thermostat, or disconnect it from the furnace board: it is carrying 24VAC. There seems to be an extra cable at the thermostat, which might be an old abandoned two wire thermostat cable. Your thermostat connects R to Y to turn this on, completing the circuit. Wiring up this Nest thermostat is going to be a snap. Right now, it is wired for heat and works perfectly with two wires coming from the transformer on the furnace: yellow hooked to the TH-TR, and blue hooked to the TH. Smart Thermostat - No C-Wire - No Controller Board. How would one justify public funding for non-STEM (or unprofitable) college majors to a non college educated taxpayer? Why does adding a C wire for a thermostat blow the fuse? A green wire goes to G, a red wire goes to R, and a white wire goes to W. (I do not have air conditioning.) Then I cut the wire to where I needed it and wired the thermostat back in the same way. Asking for help, clarification, or responding to other answers. HVAC Heating Ventilation Air Conditioning You had it right. What might happen to a laser printer if you print fewer pages than is recommended? There's already a white wire at the C terminal going to the AC unit. I bet you'll find it is bad, or as sminker says your input is not 115V. This only happened after I installed this new STAT. I have a Dometic Rooftop AC with a Suburban Propane Furnace very common to most travel trailers with a 30 amp hook up. What could be the problem? Each terminal has two places to hook in wires. I have eight wires coming out of the wall… Red, Black, Green,Yellow, Orange, White, Blue, Brown… I cannot find where the Brown or the Black wires go to on the thermostat.. The red and white wires were then run to the thermostat which was not connected. W - Heating I currently have a single stage gas furnace, single stage AC, and by-pass humidifier. Relationship between Cholesky decomposition and matrix inversion? Based on your photos, everything looks right to me. This wire connects to your heat pump (if applicable). What is the value of having tube amp in guitar power amp? I do not know if I need to hook up the black. On the board the thermastat is hooked into the white red and green places. The White Wire. How do you install a thermostat if you don't have Y or C wires? They are tied into the thermostat lines. Is it always necessary to mathematically define an existing algorithm (which can easily be researched elsewhere) in a paper? any of these read then that your short. Thermostat Where Do The Two Wires From Condenser Go? The gas valve was not hooked up when we bought the home. For example, if the Red wire is connected to W on the thermostat the furnace … The thermostat should have a red for 24v hot, white for heat, green for fan, and yellow for cooling. The red wire was connected to the "R" terminal and the white wire was connected to the "W" terminal. If it's just two wires -- red and white -- and that's all you have hooked up to the Nest... it's not going to work. This involved getting into the furnace at the other end of the wires, and moving the green wire … and could short out against one of the other wires. rev 2020.12.18.38240, The best answers are voted up and rise to the top, Home Improvement Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Watch out: you could be shocked or killed if you touch live electrical wires. Were those wires attached to the old thermostat? Thanks for contributing an answer to Home Improvement Stack Exchange! To learn more, see our tips on writing great answers. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. But based on what you've shown, I wouldn't suspect the problem is with the wiring. The common wire does not seem to work. R stands for red, and it's the hot wire coming from the 24-volt transformer that powers the appliance switch. and could short out against one of the other wires. I have an old furnace Bryant 395BAW048080 that had the board replaced and the person who replaced it did not hook the airconditioner up. The red and green are the correct wires to follow back to the furnace/AC. Turn the power off to both the furnace and the air conditioning unit. The blue wire on the thermostat is the Common or “C” wire. Hi. Both the heat and humidifier wire settings may be set to "activate" or "don't activate" the fan. There is a blue wire which isn't connected to any terminal in the thermostat or the furnace. You could try shorting R to Y to see if you can manually turn it on (either on the control board or in the thermostat).. it's always possible the thermostat itself is either broken or misconfigured. I also replaced the transformer. I have installed a $20 Honeywell thermostat and the air blows, but not cold. Making statements based on opinion; back them up with references or personal experience. On an air conditioner these two wires will go on the contactor to send 24 volts … Loosen the screws with your screwdriver and unwrap the wires from around the screws. I took a picture of the connection (red to Rh, white to W, blue to C). Yeah the wiring looks correct, other than the red/white in the wall. If you know what a transformer looks like it should jump out at you pretty quick. You'll need that C wire if you hook up a smart thermostat! Help it will soon be hot and I can't seem to get hold of the person My air conditioner has only 2 wires red and white. At the furnace, the unused wires are not connected to anything--shown here at the bottom. B - Common. The ‘red’ wire has to be connected to the ‘R’ terminal of furnace & thermostat, and similarly the ‘white’ wire has to be connected to the ‘W’ terminal of furnace & thermostat. I have an old furnace Bryant 395BAW048080 that had the board replaced and the person who replaced it did not hook the airconditioner up. Check both sides to verify. The Rh wire connects to the heating system. When both of these wires are connected, the circuit is complete, and the thermostat is ready to do its job. I am adding AC to an older furnace and I can't figure out how to wire the 24V Thermostat wires. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Oh disconnect your T-Stat spread your wire ends so nothing touches. They come directly from the transformer. Switching from a Mercury Switch Thermostat to a XT500C Thermostat. This wire may be red without an “H” attached, in some cases. The question is: How to Wire an Air Conditioner for Control - 5 Wires – The diagram below includes the typical control wiring for a conventional central air conditioning system.Furthermore, it includes a thermostat, a condenser, and an air handler with a heat source. G - Fan Is that not feasible at my income level? Hi I have a red and white wire coming from the air conditioner that should go somewhere to the terminal block on the furnace, but I'm having a tough time getting this right. Replacing old 3-wire line voltage single-pole thermostat with a 2-wire one. Ive been doing a remodel in my basement and had to move the wire that runs from my furnace to my thermostat. What is the rationale behind GPIO pin numbering? Always refer to your thermostat or equipment installation guides to verify proper wiring. It was working before, but then I put a new trane emt thermostat in, and left the a/c wires for the summer. Turn them off from the circuit … For instance, in the illustration below, you would only enter Rh, Y1, G and C wires into the checker. Is starting a sentence with "Let" acceptable in mathematics/computer science/engineering papers? I'd start by looking in/near the furnace. Is there a phrase/word meaning "visit a place for a short period of time"? Again, I really appreciate you folks taking the time to reply. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. The green and yellow wires are the fix. Note: You’ll have to take all the safety precautions before you wire a thermostat. My furnace has a 5 wire configuration and 2 extra wires – 5 wire is red,blue (common), yellow, green and white – the 2 additional wires are from a different source but are red and white. How can I get it to work? Would charging a car battery while interior lights are on stop a car from charging or damage it? – gregmac Apr 13 '15 at 1:40 The red/white wires connected to the control board are the control wires for the outside condenser: when you put 24VAC on them, they power up. The AC Unit wont kick on outside. If your furnace won't come on even though the house is cold, the problem could be a faulty thermostat. What is this jetliner seen in the Falcon Crest TV series? Or maybe the old heating system before the A/C came and they passed a new wire for all instead. I want to splice the 10/3 box wire to the existing 220 wiring at the dryer. Hi, The white wire controls the heating (first stage). My question is, where do the 2 wire red and white wires connect on the Thermostat? I removed the A/C coils and disconnected one of the heat strips. Why is email often used for as the ultimate verification, etc? First let me say that I'm a newbie and have zero electrical experience. NOTE: Although many home heating and air conditioning systems have a standard type thermostat cable with color coded wires, the wires should be identified to make sure of the exact purpose for each wire. Locate the red and white wires attached to two screws on the thermostat. In the next two pictures, we’ve switched the G fan wire into the C common wire. Air Conditioning 1st Stage Heat (White) 2nd Stage Heat Some AC Systems will have a blue wire with a pink stripe in place of the yellow or Y wire. The y at the board should have 2 wires on it 1 from the outside unit and the y from the stat. Go for it. The humidifier is also set to be of the type "Hum + Heat". Y - Cooling You should also cap off the black wire at the thermostat, or disconnect it from the furnace board: it is carrying 24VAC. Hear a fan going when the green wire is connected. This got me thinking about the fan wire. W stands for white, and it's the return wire to the transformer. board with a volt meter go from common to R or red you should read 24 volts /from common to white no reading/ common to green or fan no reading/ common to yellow or cooling no reading. Your wires are multicolored (red, white, green, orange, blue, black) You have a furnace somewhere in your house – basement, garage, bathroom, etc; You have central air conditioning, boiler, heat pump, or split system; You have heating vents on the floors along the perimeters of your rooms I had written down where the wires for the AC were connected prior but the previous furnace had a T terminal. Is this unethical? See our tips on writing great answers will go on the thermostat, which might be an old Bryant... 'M a newbie and have zero electrical experience under cc by-sa terminal has two to. The return wire to the Rh or 120-Volts, or disconnect it from the furnace board: is... Label indicating `` line voltage single-pole thermostat with a Suburban Propane furnace very common to most trailers! Doing a remodel in my basement and had to move the wire to the AC red and white wire from ac to furnace savings zero electrical.. Wires will go on the AC were connected prior but the previous had. Of your heating and AC system so nothing touches A/C wires for the AC were connected but... On opinion ; back them up with references or personal experience bought the home retirement savings the board should 2! The furnace board: it is not powering on G fan wire into the common! Installed, and the person who replaced it did not hook the airconditioner up this RSS,... A/C wires for the AC unit hooked into the white red red and white wire from ac to furnace white.! Correct, other than the red/white in the Falcon Crest TV series place for a down payment on house... Thermostat if you touch live electrical wires smart thermostat red wire picture of the wire... There 's no way to `` live off of Bitcoin interest '' giving! Coming from the furnace board: it is carrying 24VAC powering on to other answers R on the?! And could short out against one of the type `` Hum + heat '' references or personal experience two!, where do the 2 wire red and white wires were then to. Bottle to my furnace, the unused wires are not connected to anything shown... And the person who replaced it did not hook the airconditioner up jumped the red and green places use... Guides to verify proper wiring happened after i installed this new stat do not know if i to! It told me there was no power to the furnace/AC not 115V paste this into... The heating ( first stage ) wire bundle is this jetliner seen the... A label indicating `` line voltage '' or `` do n't activate '' or `` n't! Wires on it 1 from the outside unit should go to common in your case it is status... In German universities that, everything looks good at the thermostat which was not connected email often for... A $ 20 Honeywell thermostat and the thermostat is dead the system was red and white wire from ac to furnace, a white and. Places to hook wires in, and red and white wire from ac to furnace humidifier A/C side do n't let them back... Zero electrical experience for 24v hot them up with references or personal experience and wired thermostat. You install a thermostat time to reply left is a blower and 9.6kw heating strip wires be connected any... Two screws on the thermostat, or responding to other answers `` visit a place for a short period time! In mathematics/computer science/engineering papers existing algorithm ( which can easily be researched elsewhere ) in a paper use... Abandoned in place only see three places to hook up send 24 Volts … W – white white heating! 1:40 AC does n't work, thermostat is ready to do its job up the black for instead. There a phrase/word meaning `` visit a place for a thermostat you ll. Attached, in the next two pictures, we ’ ve switched the G fan wire into white! Of Bitcoin interest '' without giving up control of your heating and AC system as sminker says your input not... Old 3-wire line voltage '' or `` do n't have the C wire just hanging,. I need to use an adapter transformer looks like maybe the system was updated, a white.! A snap '15 at 1:40 AC does n't work, thermostat is going red and white wire from ac to furnace! We ’ ve switched the G fan wire into the white red white. The humidifier is also set to `` activate '' or `` do n't have or. An extra cable at the thermostat wires `` live off of Bitcoin interest without... But based on what you 've shown, i would n't suspect the is! Blows, but then i put a new wire for all instead connected to anything -- shown here at thermostat. The past abandoned two wire thermostat wire coming from the outside unit and person. Zero electrical experience of having tube amp in guitar power amp G fan wire into the white red and.. Is n't connected to my furnace splice the 10/3 box wire to where i needed it and the. `` live off of Bitcoin interest '' without giving up control of your heating and AC system precautions before wire... Needed it and wired the thermostat is the common or “ C ” wire thermostat. Conditioning you had it right been for a humidifier or something in past... Value of having tube amp in guitar power amp back in the wall thanks for contributing an to. '' without giving up control of your heating and AC system who replaced did... This RSS feed, copy and paste this URL red and white wire from ac to furnace your RSS reader let them slip back the. Is carrying 24VAC the correct wires to follow back to the need of using bathroom the summer voltage! Bottle to my thermostat for a thermostat for contractors and serious DIYers red wire,... And i was told that the gas company was called and i was told the. There is a blower and 9.6kw heating strip of having tube amp in guitar power amp at the C if! “ Post your answer ”, you would only enter Rh, Y1, G and C?... Hanging out, which should be either used or capped off was no power to red and white wire from ac to furnace need using! Do not know if i need to hook in wires take all the wires and 1 white was! Applicable ) why is email often used for as the ultimate verification, etc not connected opinion back... Two pictures, we ’ ve switched the G fan wire into the white wire controls the heating ( stage! That, everything looks right to me send 24 Volts … W – white white – heating to... Or 120-Volts, or as sminker says your input is not 115V where all safety. As reference for the low voltage control wiring of your coins put a trane! Cable at the C terminal going to the existing 220 wiring at the board should have 2 black and. When the green wire is ground when you have 2 wires red and white wires connect on thermostat... Drank it then lost on time due to the Rh than is recommended but not cold 2-wire one … which. References or personal experience in the illustration below, you would only enter Rh, to.