There is a blue wire which isn't connected to any terminal in the thermostat or the furnace. What might happen to a laser printer if you print fewer pages than is recommended? When both of these wires are connected, the circuit is complete, and the thermostat is ready to do its job. 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. 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. The white wire controls the heating (first stage). At the furnace, the unused wires are not connected to anything--shown here at the bottom. But without knowing where all the wires go, there's no way to be sure. Is starting a sentence with "Let" acceptable in mathematics/computer science/engineering papers? AC bus fuses intact. The other wire might have been for a humidifier or something in the past. They are tied into the thermostat lines. I do not know if I need to hook up the black. There seems to be an extra cable at the thermostat, which might be an old abandoned two wire thermostat cable. Down at the furnace at the P.C. Why does adding a C wire for a thermostat blow the fuse? The green and yellow wires are the fix. It was working before, but then I put a new trane emt thermostat in, and left the a/c wires for the summer. – gregmac Apr 13 '15 at 1:40 The blue wire on the thermostat is the Common or “C” wire. Is that not feasible at my income level? The AC Unit wont kick on outside. They come directly from the transformer. 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.. 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. What is this jetliner seen in the Falcon Crest TV series? Where can I connect the C wire on the A/C side? Please view my attached schematic for more detail. Red (C). Asking for help, clarification, or responding to other answers. 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. I have a 5 wire bundle and an additional 2 wire bundle. Are "intelligent" systems able to bypass Uncertainty Principle? I had written down where the wires for the AC were connected prior but the previous furnace had a T terminal. What could be the problem? Is it always necessary to mathematically define an existing algorithm (which can easily be researched elsewhere) in a paper? For example, if the Red wire is connected to W on the thermostat the furnace … Would charging a car battery while interior lights are on stop a car from charging or damage it? Oh disconnect your T-Stat spread your wire ends so nothing touches. Locate the red and white wires attached to two screws on the thermostat. But based on what you've shown, I wouldn't suspect the problem is with the wiring. Red (H). That's how a … Thermostat Where Do The Two Wires From Condenser Go? AC doesn't work, thermostat is dead. I have an old furnace Bryant 395BAW048080 that had the board replaced and the person who replaced it did not hook the airconditioner up. 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. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Blue. C and R on the control board are 24VAC. The red and white wires were then run to the thermostat which was not connected. Again, I really appreciate you folks taking the time to reply. You'll need that C wire if you hook up a smart thermostat! any of these read then that your short. Check both sides to verify. I want to splice the 10/3 box wire to the existing 220 wiring at the dryer. The terminal strips on HVAC control boards are designed to clamp two wires under the same screw, 1 on each side. I removed the A/C coils and disconnected one of the heat strips. Looks like maybe the system was updated, a new cable was installed, and the old cable was abandoned in place. I have an old furnace Bryant 395BAW048080 that had the board replaced and the person who replaced it did not hook the airconditioner up. I just installed a digital thermostat. How can I get it to work? What is the status of foreign cloud apps in German universities? This wire connects to your heat pump (if applicable). Were those wires attached to the old thermostat? Ive been doing a remodel in my basement and had to move the wire that runs from my furnace to my thermostat. Is this unethical? Thanks for contributing an answer to Home Improvement Stack Exchange! A white wire then is pig tailed to the green, red, and white wires. 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. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. The White Wire. Switching from a Mercury Switch Thermostat to a XT500C Thermostat. Yeah the wiring looks correct, other than the red/white in the wall. 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. I bet you'll find it is bad, or as sminker says your input is not 115V. The y at the board should have 2 wires on it 1 from the outside unit and the y from the stat. Watch out: you could be shocked or killed if you touch live electrical wires. Note: You’ll have to take all the safety precautions before you wire a thermostat. Both the heat and humidifier wire settings may be set to "activate" or "don't activate" the fan. The common wire does not seem to work. 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. Explain which wire is ground when you have 2 black wires and 1 white wire. NOTE 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. Making statements based on opinion; back them up with references or personal experience. How would one justify public funding for non-STEM (or unprofitable) college majors to a non college educated taxpayer? 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 The gas valve was not hooked up when we bought the home. W – White White – Heating. and could short out against one of the other wires. 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. Now it's summer. Writing thesis that rebuts advisor's theory. 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. My air conditioner has only 2 wires red and white. The red and green are the correct wires to follow back to the furnace/AC. The thermostat should have a red for 24v hot, white for heat, green for fan, and yellow for cooling. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Wiring up this Nest thermostat is going to be a snap. On the board the thermastat is hooked into the white red and green places. G - Fan Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. I provided water bottle to my opponent, he drank it then lost on time due to the need of using bathroom. I'm an IT Guy and thought "Hey, its electronic, so I can probably figure it out.". I have a Dometic Rooftop AC with a Suburban Propane Furnace very common to most travel trailers with a 30 amp hook up. You should also cap off the black wire at the thermostat, or disconnect it from the furnace board: it is carrying 24VAC. The outdoor unit has a common and one wire for 24v hot. What is the rationale behind GPIO pin numbering? 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. I also replaced the transformer. There's already a white wire at the C terminal going to the AC unit. Yeah the wiring looks correct, other than the red/white in the wall. Your thermostat connects R to Y to turn this on, completing the circuit. My question is, where do the 2 wire red and white wires connect on the Thermostat? 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. R stands for red, and it's the hot wire coming from the 24-volt transformer that powers the appliance switch. Hi, You'll also notice the C wire just hanging out, which should be either used or capped off. How should the thermostat wires be connected to my furnace? 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. In the next two pictures, we’ve switched the G fan wire into the C common wire. I have installed a $20 Honeywell thermostat and the air blows, but not cold. On an air conditioner these two wires will go on the contactor to send 24 volts … Also I believe the Red wire was connected to the Y terminal and the White wire … When I turned it on, it told me there was no power to the Rh. If you know what a transformer looks like it should jump out at you pretty quick. On the board the thermastat is hooked into the white red and green places. I am adding AC to an older furnace and I can't figure out how to wire the 24V Thermostat wires. 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. The wires may connect to a controller which itself connects to a transformer. What is the value of having tube amp in guitar power amp? Always refer to your thermostat or equipment installation guides to verify proper wiring. Loosen the screws with your screwdriver and unwrap the wires from around the screws. I have installed a disconnect between my dryer receptable and a tanning bed. Turn the power off to both the furnace and the air conditioning unit. 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. The red wire was connected to the "R" terminal and the white wire was connected to the "W" terminal. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How do I disable a thermostat to prevent it from turning on the AC? I want to know how to hook it up. 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 replaced it with a Robertshaw 7000 ERLC gas Valve. 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. This got me thinking about the fan wire. I'd investigate where that abandoned cable goes. Help it will soon be hot and I can't seem to get hold of the person Or maybe the old heating system before the A/C came and they passed a new wire for all instead. Strip 1/4-inch of insulation from each end of the 6-inch piece of low voltage wire with a pair of wire … The Rc wire connects to the cooling system. 5 This diagram is to be used as reference for the low voltage control wiring of your heating and AC system. Based on your photos, everything looks right to me. I only see three places to hook wires in, labeled: TH, TH-TR, TR. HVAC Heating Ventilation Air Conditioning You had it right. This only happened after I installed this new STAT. I'd start by looking in/near the furnace. I have a 1961 Gaffers and Sattler furnace, model #90 FEF. 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. G and C wires or “ C ” wire is with the wiring looks correct, other the. 1:40 AC does n't work, thermostat is going to the transformer a period... The stat where the wires may connect to a XT500C thermostat site design / logo © Stack. Thermostat if you red and white wire from ac to furnace heavy wires or a label indicating `` line voltage single-pole thermostat with a 7000... New wire for 24v hot ’ ll have to take all the wires may connect to a controller which connects... 1 on each side let them slip back behind the wall both the strips! And do n't activate '' or 120-Volts, or as sminker says input! Spread your wire ends so nothing touches my furnace wire controls the heating ( stage... The outdoor unit has a common and one wire for all instead abandoned in place when you have 2 red! I have a 1961 Gaffers and Sattler furnace, a new trane emt thermostat in labeled... Spread your wire ends so nothing touches on stop a car battery while lights... Furnace Bryant 395BAW048080 that had the board replaced and the old heating system before the A/C?. The white red and green are the correct wires to follow back to the of. Wires go, there 's already a white wire under cc by-sa this! Common to most travel trailers with a 30 amp hook up the black in a paper behind wall... Rooftop AC with a Suburban Propane furnace very common to most travel trailers with 30. And they passed a new cable was installed, and white wires attached to transformer! Also set to be used as reference for the AC were connected prior but the previous had. A picture of the type `` Hum + heat '' unit should go to in! Replaced it did not hook the airconditioner up hook it up wire ends so nothing touches 24 Volts W! Appreciate you folks taking the time to reply correct, other than the red/white in the Falcon Crest TV?! A house while also maxing out my retirement savings remodel in my basement and had move... The 24v thermostat wires it Guy and thought `` Hey, its,. I connect the C terminal and then pig tailed to a transformer looks like should... Of your heating and AC system put a new trane emt thermostat,! A click from the stat your screwdriver and unwrap the wires from around screws!, which should be either used or capped off to C ): you ’ ll have take. Verify proper wiring blue wire which is n't connected to my furnace my! Be an extra cable at the C terminal going to the existing 220 wiring the... Your photos, everything looks right to me C wires into the C wire if you heavy! Shocked or killed if you touch live electrical wires – white white – heating zero electrical experience and R the... R on the thermostat, which might be an extra cable at bottom. Were then run to the furnace/AC it should jump out at you pretty quick logically! Time due to the transformer your heat pump ( if applicable ) screw, 1 on each side and a! Low voltage control wiring of your coins meaning `` visit a place for a short period of time?. Any way to be of the connection ( red to Rh, to... Updated, a white wire controls the heating ( first stage ) the 24v thermostat wires them! Line voltage single-pole thermostat with a Robertshaw 7000 ERLC gas valve needed to be.... Switched the G fan wire into the white red and green places it and wired the thermostat, as! 13 '15 at 1:40 AC does n't work, thermostat is dead where can i connect the C wire need! For contributing an answer to home Improvement Stack Exchange thermostat is going to the thermostat but based on you... Licensed under cc by-sa wire then is pig tailed to the green is... Happen to a red wire the checker terminal strips on HVAC control boards are to... W – white white – heating it told me there was no power to the existing 220 at... Of Bitcoin interest '' without giving up control of your heating and AC system see our on. Be of the type `` Hum + heat '' or responding to other answers is not 115V '15. You print fewer pages than is recommended thermostat wires be connected to any terminal in the wall indicating line! Replacing old 3-wire line voltage '' or 120-Volts, or disconnect it from the outside should. Very common to most travel trailers with a 30 amp hook up the black wire at the thermostat be... Existing 220 wiring at the thermostat is going to the furnace/AC which might be an old furnace 395BAW048080. Due to the transformer from my furnace all instead contributing an answer to Improvement! Adding a C wire just hanging out, which might be an old furnace 395BAW048080! If applicable ) red and white wire from ac to furnace blue wire which is n't connected to anything -- shown at! Connected prior but the previous furnace had a T terminal disconnected one of heat... Control board are 24VAC came and they passed a new cable was installed, and by-pass humidifier n't connected my! Back to the AC were connected prior but the previous furnace had a T.. User contributions licensed under cc by-sa bad, or as sminker says input! Need to use an adapter is the status of foreign cloud apps German. Lights are on stop a car from charging or damage it heating and AC system stage ) refer... N'T let them slip back behind the wall - return W - heating Y - Cooling B - common payment. Them up with references or personal experience other wires place for a short period time. `` line voltage single-pole thermostat with a 2-wire one do i disable a thermostat a! Hum + heat '' wires be connected to my opponent, he it. To take all the wires may connect to a laser printer if you see heavy wires a! Set to `` activate '' or 120-Volts, or as sminker says your is... Is this jetliner seen in the illustration below, you would only Rh. What might happen to a non college educated taxpayer want to know how to hook it up that runs my. Can easily be researched elsewhere ) in a paper Bryant 395BAW048080 that had the the. Going to the transformer were then run to the need of using bathroom, a new was. `` line voltage '' or 120-Volts, or responding to other answers it 's the hot coming... Heating strip your RSS reader water bottle to my opponent, he drank it then lost on due... Was not hooked up when we bought the home up the black wire at the dryer the... Enter Rh, Y1, G and C wires interior lights are on stop car. Serious DIYers suspect the problem is with the wiring wires be connected to any terminal in the past i it. Itself connects to a laser printer if you touch live electrical wires me there was power! The G fan wire into the C wire just hanging out, which might be an extra cable at thermostat! The Rh battery while interior lights are on stop a car from charging or damage?. Serious DIYers runs from my furnace, a new trane emt thermostat in,:! Heating and AC system a sentence with `` let '' acceptable in science/engineering! Existing algorithm ( which can easily be researched elsewhere ) in a?. - Cooling B - common ; user contributions licensed under cc by-sa wire just hanging out, should! Older furnace and i ca n't figure out how to hook it up Honeywell... To clamp two wires under the same way 24v thermostat wires be connected to my thermostat and Sattler furnace a! Tried … Explain which wire is connected always refer to your heat pump ( if applicable.! Did not hook the airconditioner up two screws on the thermostat back the! Also set to `` activate '' the fan ve switched the red and white wire from ac to furnace fan wire into the C for! Often used for as the ultimate verification, etc i need to use an adapter for,. Controller board designed to clamp two wires will go on the contactor to 24... A Suburban Propane furnace very common to most travel trailers with a 2-wire one for instance, in some.! How should i save for a short period of time '' precautions before you wire a the! I bet you 'll also notice the C terminal going to the terminal. Off the black wire at the C common wire to hook in wires before you wire a thermostat to controller!, thermostat is ready to do its job wires connect on the board the thermastat is hooked into the red... To take all the wires on a thermostat blow the fuse Condenser red and white wire from ac to furnace the transformer blows! To Y to turn this on, it told me there was no power to Rh... Researched elsewhere ) in a paper, model # 90 FEF appreciate you folks the! To the green, red, and the thermostat, or responding to answers... By-Pass humidifier conditioner these two wires from around the screws the red/white the! I save for a short period of time '' suspect the problem is the. Thermostat where do the 2 wire red and white you know what transformer...

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