I understand that the Lyric does not have “ dry contacts “ so I am choosing to include a 24vac relay driven as stage 2 output configuration on w2. Look at your transformer you will see on many that one terminal is labeled “load” and the other is labeled “C” for common on the 24vac side of the transformer. Worked great for 5 days without the blue common wire installed (directions said to use the same wires as the old therm.) I’ll continue to think about your question, though, and I’ll come back and give an update if I find an answer! I want to install a wifi thermostat. And Nest’s: https://widgets.nest.com/compatibility/?mode=buy. Marcelo. Sorry to be of such limited help. Join Yahoo Answers and get 100 points today. I purchased a NEST Gen 3 over 12 months ago and tried to get it to work with just the 2 wires off the heater – I had the same problems that everyone on this thread has mentioned – so I packed it away. If your boiler/furnace does not have a C terminal then you need to install a 24 volt transformer and wire it as the way I said earlier. I never actually pulled the cover off my thermostat to check whether it had a c-wire or not. Its the white wire thats if someone has'nt been working on it already. More detailed explanation Sorrta lost. However, their was a blue, C wire in the wall. If you’ve got a wire connected to the terminal labeled “C”, you’re (probably) good to go with a smart thermostat installation. Saying that the C wire is the power source, or supplies the power is misleading. These neutral wires are what return all of the AC circuits in your home – the ground wires are only there in case of a power surge or other emergency. amzn_assoc_rows = "1"; Did you get an answer to your question? My house was built in 1942 and still has the original furnace. Of course, there are plenty of thermostats that don’t require a C-wire that are compatible with gravity furnaces (which is probably what you’re replacing…), but I don’t know how to advise you on installing a C-wire into a system without a control panel to work with. I wanted to go smart thermostat, and like an idiot, didn’t get the Ecobee unit. With Regards, Tommy E. I know this is an old post, but thought I’d try to get a little info. Without getting into any further detail, we decided to switch the thermostat to an ‘old style’ manual one – one that has no digital operation, and very simple heat-off-cool controls ….. along with the temp control. lead wires for primary connections are color coded for easy installation. I have found my carrier system to be even weirder than one might expect. My Carrier installer wants nearly $1000 to install the replacement thermostat. did you solved the problem ? If that is live, would there any reason to NOT just make the Blue C wire connection there, then connect C wire at the thermostat? Fixed! I’m going to use a voltmeter to test across R and C for 24v first though. Any suggestions on how to proceed? the wires in thermostats are bell wires and not full voltage electrical wiring. I do a lot of my home improvement because I enjoy researching, understanding and saving money. I installed my wifi thermostat using the techniques mentioned in this article. Sorry Dave but residential power here in Canada is single phase. Hi Bill – thanks for your posts. The Nest will “pulse” the heat wire, turning on the furnace to pull a bit of power to keep itself going. Am I doing something obviously wrong? C-White= 24VAC (common) to white wire Plugged the 24VAC power supply in to the 240V point, connected the nest, and it automatically detected the change in power. I have experienced that on an old picture tube type TV. my boiler or the Air Handler? Thanks I have had many more SURPRISES from the neutral wires. After hooking up the new thermostat, connecting the same blue wire (now at the thermostat end) to the C connector of the thermostat. Just give a gentle pull after screwing them down to make sure they won’t slip out. i am trying to hook up a honeywell smart wifi thermostat TH9320WF, and i do have the Honeywell wiresaver module too THP9045. I totally agree with your reviews of the 3. There is no way 24 volts will kill you. I want to install a Honeywell Wi-Fi thermostat. glad thermostat wire article helpful .. Best Wifi Thermostat Reviews | The ultimate resource for …Smart thermostat guide – wifi-enabled thermostat reviews, The ecobee3 hands smart thermostat today. Thank you!! My problem was that there was no terminal on the 1999 vintage control board but after a bit of research was able to determine I can just wire into the blue coming from the 24v transformer. The fan only is supposed to come and circulate the air 35% of the time. Replacement of the transformer will not solve the problem. Thermostat wire comes in various weights. I don’t know anything about your furnace but I just hooked up 3 wifi thermostats on old furnaces at my church and that is what I learned from my research and experience. W (usually white) activates heat. To find start and end of a winding you measure resistance with your multimeter. We are 90 miles south of the Canadian border in MN. All I did was connect the unused blue wire from the thermostat control wire bundle to the blue bundle at the 24V transformer (be aware, there is another similar looking wire bundle next to the thermostat control wire bundle, but only 2 wires are used, black and white. 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. I have 2 thermostats. Carrier uses a proprietary ABCD junction block (Block PL7 in the circuit diagram) for the thermostat. I suspect that is the proper point, but don’t know if the ABCD connection disables the screw-terminal block. ~ diy-home-projects.vwx.info, Review: Honeywell RTH6580WF WiFi 7-Day Programmable thermostat, Honeywell Lyric Round Thermostat {Review} - Sippy Cup Mom, Base Station, Choosing Parts « Mark Paruzel's Blog, Honeywell Lyric T5 Wifi Thermostat Review |TTI | Scoopster, Honeywell Lyric T5 Wi-Fi Thermostat Review – MyLikes. It turned into a simple exercise of connecting the “blue” wire and providing the C wire as needed. I wish they weren’t so expensive. Transformers are used to meet a wide variety of needs. It seems with my approach, I should be able to do this. Primary or secondary? This wire bundle goes to the outside compressor to control it). not 24v DC. Power, Can, Transformer. Should I remove the switch from the furnace?Thanks. Yellow/Y is the AC compressor. NOTE: on most thermostats the "G" and "Y" are connected together at all times when the fan switch is in the "Auto" mode, If you sully R to G then you will most likely energize the outdoor unit contactor! Can I connect the yellow at furnace level with the white already connected and use the yellow at the thermostat for the C connection? I have a few things you might try (sorry if you’ve tried these already): 1. York and Trane like to use (B) as common. Here’s what happens to your smart thermostat, Read one frustrated Nest owner’s review of his experience with the “pulse” problem here, Install new thermostat but not sure if I have wire C, http://www.greentechmedia.com/articles/read/the-us-smart-thermostat-market-is-potentially-massive, http://www.huduser.org/datasets/ahs/ahs_taskc.pdf, https://widgets.nest.com/compatibility/?mode=buy, http://www.doityourself.com/forum/thermostatic-controls/465126-help-installing-nest-millivolt-system-using-24v-transformer.html#b, https://www.dropbox.com/s/o7uw343golqhwg1/20160310_175343.jpg?dl=0, Review: Nest Thermostat strikes a perfect balance between value and features, Review: Nest Learning Thermostat (3rd gen.) keeps pace with the competition, Emerson Sensi review: a great WiFi thermostat at an affordable price, Review: LUX Geo smart thermostat (GEO-WH-003 / GEO-BL-003), Ecobee SmartThermostat review: premium thermostat delivers comfort and convenience, ecobee’s new SmartThermostat gets better at everything – but it’s still a thermostat, Review: ecobee4 adds Alexa, keeps everything else that makes an Ecobee thermostat awesome. R (from transformer) —–> Rc (on Thermostat) I have not tried the Lyric yet. Now I just need to figure out which wifi thermstat to get. A-Green= Data A to Green wire That is a great question! I have the same setup. Without a C-wire, the Nest gets its power from your heating or cooling system… assuming it’s running. Many transformers have a fuse on the 24 volt side. Eased my concerns as a novice DIY who likes to avoid electrical work. Its 4degrees, I'm getting hot water but when i the the cold water nothing comes out? If you measure the DC level between plus and negative you will have +12 volts with respect to the common negative of 0 volts. You could try a blind guess. Let me know when you can. The furnace does have a C terminal, so I plan to use it for a new Nest I’m going to install. I have one question. I suspect I can simply move the free green wire over to the common side of the 24V transformer to make it a C-wire with heat only function for an ecobee? But the heater did not. One for heat (Nest that I installed because it had the C) and one for A/C. If you have typical wires behind your thermostat, those wires must go somewhere. amzn_assoc_region = "US"; Its 9 in. More specifically, 16% were built in the 1990s and later (“later” being capped at 2005, the study I’m referencing is getting old: http://www.huduser.org/datasets/ahs/ahs_taskc.pdf). Instead of trying to run a C wire all the way downstairs to the basement/furnace, is there a way I can just connect it to a power outlet that is about a foot below my thermostat? I really appreciate you putting this together! Out of the fan comes out a blue and yellow wire. I am not sure the transformer return is conncted to the cabinet (probably not) – see wiring diag at https://www.dropbox.com/s/o7uw343golqhwg1/20160310_175343.jpg?dl=0. The furnace is a circa 1970 chrysler airtemp with a 4-terminal block labeled “general control”. I’m upgrading from a Honeywell Mercury thermostat to a Honeywell wifi 8580. […] Install a C-wire or adapter designed to compensate for a missing C-wire (here’s our guide) […]. i have a oil boiler in basement, thermostat in 1st level and ac central air blower in attic. That would mean pulling new cable which I’d like to avoid. Any help? Smart Thermostat Guide – Wifi-enabled thermostat reviews …Thermostat wire: , Saying wire power source, supplies power misleading. I’m very tech savvy and really want to install a wifi thermostat but my furnace is so old I don’t know how to install a C-wire. Common side of 24v transformer Common side of 24v transformer I have a two wire boiler (quite old and dated) that is hooked up to a basic thermostat in my family room. Above the white wire says th. the common is white, but there are usually only 2 wires in a thermostat, one way in and one way out. I have a white Rodgers 1f89-211 thermostat and have 8 wires. I connected C, G, and Y to the appropriate connectors on the furnace, and voila!… i got heat! The specifications of the Powertech power supply is: Voltage input: 240VAC, 50Hz, Voltage Output: 24VAC, Current: 1000mA. So I removed it to double check the wiring. (O), Orange , Energize to cool (used for reversing valve on heat pumps). How do you think about the answers? I have installed an external transformer and ended up with this wiring scheme to control my AC/Boiler and power my Nest. As far as I know there is no control panel. Only needed 4 wires in the old model. (E), blue, pink, gray or tan, emergency heat relay on a heat pump. I have no problems with it at all now. Removed the link between RC to R (important) . What is Spironolactone used for? Basically duplicates what the furnace would be sending. Now I know and will be able to implement it in my business in the future. you could connect another identical one in parallel. If you’re considering purchasing a smart thermostat, you’re probably thinking of doing the installation yourself. Connecting new HoneyWell thermostat to old Lennox furncase. At the beginning of the summer, I installed a Z-wave thermostat. The secondary or low-voltage side is the power that is transformed into 24 volts. This time I purchased a $29 POWERTEC 24VAC 1A BARE ENDS POWER SUPPLY from JAYCAR Electronics (Australian). Anyone know how I can fix this? Thank you! Anecdotally, my 1977 home on the west coast has a programmable thermostat but no C-wire. […]. May 20, 2020 Guest Writer 10. Then my Google foo kicked in and brought me here! Can I put the red and white wire in the same place ? If you get it right, there'll be 24 volts AC between R and C and happy thermostat. Learn how your comment data is processed. I’ve heard horror stories of people frying their furnaces because they wired it wrong. Hi Jim that white is providing power to AC unit so do not make any changes on C terminal as white on TT is W wire for heating. Meanwhile the Transformer you plugged in being connected to Rh and C will let your thermostat slurp all the power it wants and not need batteries. you would need to get a 24VAC transformer. My question is do I connect the 24v to C and Rc, leaving the Rc wire from the AC connected as well or do I leave the Rc wire from the AC disconnected and use the Rc/Rh jumper? Is there any way for me to test this prior to buying a wifi thermostat? I will post the solution. We are available to assist you 24/7. So thank you so much for this article! R (Rc on therm) Here’s Ecobee’s: https://www.ecobee.com/compatibility/ There is no ground, there is no neutral, it's just two hot legs. The C wire closes the circuit and allows continuous flow … So hot & common are swapping 60 times every second when power is present & the circuit is closed. (I have the schematic, and I see no other landing point for C.) Logically, this makes sense to me. I wonder why you might be looking for the commom. Stringing a new furnace wire is not an option. Is it okay to connect a third wire to power the thermostat? Venstar Add-a-Wire adapter has you covered, Nest Learning Thermostat advantages over Honeywell Wi-Fi RTH9580WF, A Room Too Cold And A Room Too Hot – Your HVAC Doing The Same? […]. The thermostat has; O/B Y RC R G W terminals. I have a Lyric Round controlling a NG forced air/ac and desire it to control a millivolt NG fireplace. Most states have outlawed the old fashioned “mercury blob” thermostat. At the thermostat the white wire is W. I also have a yellow wire free at thermostat and furnace. One common culprit is a faulty HVAC transformer. The common and red from the 5 wire source are not showing power on a volt meter. The power circuit powers the furnace but not the condenser due to the generator not being strong enough to power it anyway. My old thermostat only used 4 wires, the white,green, yellow and red. As you can see in the photo above, this furnace does not have a C-wire hooked up. These photos are from my own home, but every home is a unique snowflake. I have a Honeywell wifi thermostat set up. Red – Rc – 24VAC (dedicated to heat call) —-> this should have the “Rh” label The red is the 24v lead. I had a c wire hidden in my wall and connected it to the c terminal on my nest thermostat. Afte about 5 hours the nest throws a e195 error – basically a common wire error which I do not have. The C and Rc terminals are what powers the thermostat. My wiring had 5+ wires going to the thermostat initially, however only 4 were in use (R, Y, G W). A 24 VAC (volt alternating current) transformer is a step-down type of transformer. Evidently I mistakenly connected the W wire to the C, and this allowed power to the thermostat for the display. I purchased a new thermostat that I plan on installing tonight. The red is the 24v lead. Although there are some minor variations on colors the following are close and cover most applications. (W2), Pink or other color, second stage of heat (may be same as (W) on heat pump or fossil fuel system). I have an outlet in the closet beind the tstat. With ALL THAT in mind, I’m guessing the C-wire is in less than 20% of U.S. homes. Iraq rocket attack hits U.S. forces, killing contractor, Larry King's estranged wife to contest secret will, 3-time Pro Bowler Vincent Jackson, 38, found dead, 'Idol' accused of exploiting Claudia Conway: 'Disgusting', Jan. 6 'didn't seem like an armed insurrection to me', How Biden's vaccine rollout compares with Trump's, ESPN responds after UFC commish insults reporter, Teigen shares unfiltered photos of surgery scars, The It List: Dwayne Johnson runs for president, Celebrity chef laments historically tough time in biz, 'Punky Brewster' star was 'so in love' with Andy Gibb.
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