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