Ecobee add a wire - Wire R and W from the relay box to Rh and W/W1 on the Ecobee, while leaving the relay's C terminal unused. Then wire the secondary of the separate transformer to Rc and C on the Ecobee. The Ecobee will figure all the rest out by itself, running off of the separate transformer on Rc while switching power from Rh to W to control the heat.

 
The feature-rich Ecobee Smart Thermostat Premium controls your heating and cooling, works as a smart speaker and security device, monitors air quality, and supports lots of third-party platforms.. Nancy noone winter park

When you test this you need to reconnect all the other wires properly (Y, W, G, R) so the ecobee terminals are in a full circuit so the ecobee has a return path to complete the 24v power circuit loop. Do not trust what a previous tech did. They might have been color blind. LOLTo use dampers with ecobee thermostats you would need a zone control board. The thermostat would connect to the zone control board. The zone control board would also control the dampers and the HVAC system, based on the thermostat input. Some compatible zone boards are EWC Controls NCM 300 or Honeywell Truzone HZ311. 1.L: This terminal is designated for indicator lights on the thermostat, sometimes for when auxiliary or emergency heat is turned on, or if there's a general problem with your system. Given that and your comment, it appears this is a signal coming from your HVAC unit and is intended to indicate a fault by lighting a light on the thermostat ...Refresh. Skip to Main ContentPull the wires through the hole in the middle of the backplate and then attach it to the wall using the drywall anchors and screws provided. Advertisement. TIP Use a 3/16" drill bit to drill a hole for the drywall plugs. Remove the Rc, C, and PEK labels from the label sheet and attach them to the wires as shown below:Furnace/boiler connected to Rh and W1 terminals. Transformers connected to C and Rc. Tstat figures the rest on its own during initial configuration. For systems with both heating and cooling, ecobee is powered by Rc and C. If you connect an external transformer to Rc and C, you can connect Rh and W1 for heating.The easiest way to find C is to find the Y wire going to your AC unit. The other connected wire coming back from the AC unit is C. So connect the not connected blue wire from your T stat to any other blue wire in the furnace, done. Thanks for posting the wiring diagram, that's a really smart way to try and figure things out and helps us help ...37K subscribers in the ecobee community. A subreddit for ecobee and all their smart home products. Skip to main content. Open menu Open navigation Go to Reddit Home. ... Confirming Whether or Not I Can Add C Wire or Get Battery Powered Smart Thermostat - All Electric - Better Pictures.Add-A-Wire Accessory, Briidea Common Wire Kit for All 24VAC Thermostats (4 to 5 wires), White. ... Thermostats 24 Volt Transformer C Wire Power Adapter for Nest, Ecobee, Honeywell WiFi Thermostats, Power Supply for Nest Hello, Ring Smart Doorbells Chime. 4.3 out of 5 stars ...15 Dec 2019 ... Connecting an old 2 wire thermostat to ecobee smart thermostat. ecobee lite: https://amzn.to/2LZW6pH Furnace cover Switch: ...Refresh. Skip to Main ContentIn most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides, wiring diagrams, troubleshooting tips and more. Check compatibility with your HVAC system. Download the ecobee app for step-by-step installation instructions. Download the ecobee app.Verify the correct wiring for your ecobee model: Example: R wire from PEK to RC connector, G wire to C connector, W wire to W1 connector, and Y wire to PEK connector. Ensure that the C wire from the PEK is connected to the C connector on the HVAC control board. Check that the ecobee is properly placed on the thermostat base:Option 2: Use a multimeter to measure the voltage. WARNING: To avoid the risk of shock, injury, or death, always use caution when working with electricity.Remember, if you're uncomfortable working with electrical wiring, we can help you Find a Pro to do it for you. The most accurate way to check your doorbell's wire voltage is to use a multimeter to measure the voltage directly.The ecobee Smart Thermostat Enhanced and Smart Thermostat Premium can be installed in homes with Air to Air or a Geothermal Heat Pump. Watch this video for h...If your humidifier and furnace share the same common then you only need a single wire into ACC+. If Op has the same as mine (same town and looks the same) it is just a mechanical switch cut into the ground. There is no power. It is just a 'bridge' to ground a water solenoid in the basement.Installation typically takes 45 minutes or less. Simply follow the instructions included in the ecobee mobile app, or in the manual that was included in the box with your ecobee. ... check out the following Support articles: Installing with a C wire? Installing without a C wire (Power Extender Kit)? ecobee Support. More resources. Compatibility ...May 9, 2019 · About This Product. The Common Maker adds a common C connection to a thermostat cable with 2 or more wires. A common connection allows the thermostat to operate without batteries or power stealing circuits. Compatible with all major name brand Wi-Fi thermostats and HVAC equipment, including furnaces, air handlers, zone valves, zone controllers ... In most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides, wiring diagrams, troubleshooting tips and more. Check compatibility with your HVAC. Download the ecobee app to install your thermostat. Download the ecobee app.The Ecobee Power Extender Kit works by connecting to your home’s existing thermostat wires to create a complete circuit; this provides continuous 24-volt AC power to your thermostat for homes that don’t have a C wire. Install the PEK on the HVAC system’s control board. Ecobee smart thermostats come with a Power Extender Kit included free ...I'm assuming that is the wire that might be behind the wall at stat - that will go in the C terminal on Ecobee? I currently don't have anything in C on old stat - so was curious why there was already a connection to furnace C terminal. The white casing/wire (with 2 wires) travels to the A/C unit. The brown casing goes up to thermostat.Install ecobee Smart Thermostat Enhanced & Smart Thermostat Premium. Installing an ecobee smart thermostat takes most Smart Owners thirty to sixty minutes. Watch this video for an overview and use our mobile guide for step-by-step instructions. ... ecobee Smart Doorbell Camera (wired) Detection and Notifications; View All (10) No topics yet ...How to install Ecobee new smart thermostat with 5 wiresIn this video we demonstrate how to install Ecobee new smart thermostat. This application is 5 wire t...Ecobee's Power Extender is designed to get around this and can power the thermostat even with a four-wire system. While this is an excellent feature that will broaden the range of homes that the Ecobee is compatible with, we don't believe this Power Extender will guarantee that the thermostat will work in all homes without a C-wire.Ecobee isn't compatible with this setup. Theoretically you could connect the ecobee to zone 2 or zone 3 and as long as zone 1 is set to cool on, zone 2/3 should also be activated and allow the ecobee to call for cooling (obviously without fan control and you would add a C wire).An ecobee3 Lite does not need a C-wire to have it installed. However, it will require a Power Extension Kit, which is the best solution for you right out of the box. This …Hello. I have an Ecobee SmartThermostat working just fine using a 4-wire connection with a PEK. However... I want to add a wire to enable use of the Humidifier control. I created the attached diagram based on previous posts illustrating my current wiring and then adding a Venstar Add-a-Wire. Anybody do something similar? I believe this should work.Refresh. Skip to Main ContentA wire connected to the Y3 terminal on your current thermostat indicates that you have a three-stage cooling system. ecobee thermostats do not support three stages of cooling. One workaround is to place a jumper between the Y2 and Y3 terminals on your furnace's control board.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...The ecobee app lets you set up and control your ecobee devices from anywhere. You can control your ecobee thermostat, cameras, sensors, lights, and ecobee Smart Security. The ecobee app is available on iPhones and iPads, and Android phones and tablets. You can learn more about how to use the app here https://bit.ly/3UfM5ae13 Feb 2017 ... Join Vicki & Steph from Mother Daughter Projects as they install the ecobee smart thermostat! Product Used (Affiliate) Ecobee3 Thermostat ...Good to know: If you decide to install the ecobee thermostat, you will be left with one unused wire. If you don't already have a C wire, you can use the extra wire as the C wire to power your thermostat—no need to install the Power Extender Kit! Connect the unused wire to C/Common on both ends (HVAC and thermostat) during installation.At the ecobee thermostat wire as follows: R wire to the RC terminal; G wire to the C terminal; Y wire to the PEK terminal; W wire to the W1 terminal; Place your ecobee on the wall mount, restore power to your HVAC system. The ecobee will now guide you through configuration. Good to Know:FYVE 24 Volt Transformer https://amzn.to/2OChLIPECOBEE Smart Thermostat https://amzn.to/3pm20SOEMAIL ME: [email protected] TRY BOD: https://www....The colour of the wires don't necessarily mean anything. If you have a blue wire connected to Y instead of yellow, then your blue wire is a Y. Moving this wire to C on the ecobee does not make it a C wire as it will still be connected to Y at your furnace control board. If there isn't a Y wire connected to the control board, there is likely a ...How to install ecobee3 lite. In most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides and videos, wiring diagrams, troubleshooting tips and more. Check compatibility with your heating (and cooling) system. Download the ecobee app to install your ...When you register your new ecobee to your account, you will be able to access it in the mobile app and through the Web Portal. From there, you'll be able to control and manage all of the thermostats linked to your account. Good to know: You can add up to 16 ecobee smart thermostats to a single account.Depending on how many spare wires you have behind the wall at the thermostat, your installation will require additional components that are not included with the ecobee, including running new wires and/or purchasing an external 24VAC transformer, SP/NO isolation relay, or Fast-Stat Common Maker.Control your home's comfort with energy-saving ecobee thermostats. Connect to SmartSensor for comfort in important rooms. ... ¶ Smart Thermostat Enhanced only supports accessories connected to the thermostat by one wire. ... in April, 2021, ecobee customers in North America saved up to 26% on their heating and cooling costs. When you add up ...SmartSensor works with ecobee Smart Security for reassurance that everything's running smoothly at home. Works with ecobee Smart Thermostat Premium, Smart Thermostat Enhanced, SmartThermostat with voice control, ecobee3 lite, ecobee4, and ecobee3. Temperature and occupancy detection. Follow Me mode for comfort that stays with you.Works with ecobee sensors. Upgrade your protection and energy savings with ecobee sensors. Extend security throughout your home with sensors that detect motion, entries, and exits. Plus, add an award-winning ecobee smart thermostat to your system to save energy and keep your home the perfect temperature. Read on for everything you need to know about installing and using our first thermostat model, the ecobee SMART, its companion Equipment Interface Board, and the Remote Sensor Module (sold separately), or download installation guides and wiring diagrams in the PDF format. The FAST-STAT Common Maker provides a common 'C' wire to smart thermostats over an existing 2-wire thermostat cable, eliminating the need to run new wires.In...Assuming that you don't have a 5th wire run in the wall that was just never connected, Ecobee provides what they call their PEK (power extender kit) in the box. You interpose it with the 4 existing wires at your furnace and the 5th C wire and it passes all the signals it needs through them.Ecobee Thermostat: https://amzn.to/35uLwRhFavorite Smart Home Devices: https://www.amazon.com/shop/onehoursmarthomeIn this video we teach you how to install ...Refresh. Skip to Main ContentTrying to add a second ecobee 3 into the mix. Installed the first one this summer on my central air system. Worked out great. ... "This entails running a third wire, as well as installing an external 24VAC transformer with an isolation relay. This is applicable for a furnace/boiler with T/T contacts. A standard 24VAC 20/40 VA plug-in ...This will run the fan regardless of the System Mode. To adjust this setting: On the ecobee Thermostat. Go to Main Menu > Fan > Auto, then select the desired runtime from the drop-down menu. On the ecobee app. Tap Home > Tap the Thermostat > Tap the Menu > System > Fan > Select the desired runtime, then press the back arrow to save. Good to know:In order to use Ecobee to control an ERV, users must first ensure that their system is compatible with the home automation system. Once compatibility has been established, users will need to download the Ecobee app and connect their ERV to the control system. Once the system is connected, users can begin to configure their settings to control ...Ecobee thermostat Two Wire Install - What to do if you can't run new wires upstairs Purchase the Ecobee HERE: https://amzn.to/3RvgTT7Smart sensors Here: http...Firmly grab the ecobee thermostat and gently pull straight away from the wall without twisting or turning. Under the barcode there will be a 12-digit code, you can differentiate the models based on the first 2 digits. Smart Thermostat Premium - 53. Smart Thermostat Enhanced - 42. SmartThermostat with voice control - 52. Verify the correct wiring for your ecobee model: Example: R wire from PEK to RC connector, G wire to C connector, W wire to W1 connector, and Y wire to PEK connector. Ensure that the C wire from the PEK is connected to the C connector on the HVAC control board. Check that the ecobee is properly placed on the thermostat base: The $249.99 Ecobee Smart Thermostat Premium and the $189.99 Ecobee Smart Thermostat Enhanced join the Ecobee3 Lite (now priced at $149.99) in Ecobee’s lineup. Both new models are available now ...Refresh. Skip to Main ContentAnd, yes, the ecobee runs on 24VAC. I see the Ecobee enhanced doesn't have an RC terminal, so will it not work with a 24V transformer? Correct. You cannot use an external transformer. You'll either have to use an older model ecobee that has separate Rc/Rh terminals, or pull in a C-wire from the furnace transformer.Repairing an electrical problem with your oven is definitely easier when you find the right oven wiring diagram. Check out this guide to oven wiring problems, and to finding those ...To install an ecobee thermostat with two wires, you will need to connect the red and white wires to the R (24VAC) and W (Heating) terminals on the thermostat. Then you will need to power up the thermostat by connecting the remaining wire to the C (Common) terminal. After that, you will need to program the settings on the thermostat, and you ...Reconfigure your ecobee thermostat. If you accidentally wired up your ecobee system as a Conventional system when you have a Heat Pump system, once you have corrected the wiring you will need to reconfigure the ecobee.. On the thermostat . Go to the Main Menu > General > Settings > Installation Settings > Equipment, then Reconfigure Equipment.; If you have a heat pump, verify the O/B reversing ...Installed a Ecobee Premium Smart Thermostat:https://www.amazon.com/ecobee-Thermostat-Premium-Quality-Monitor/dp/B09XXS48P8/Using a Fast-Stat Common Maker:htt...Also if you don't mind, when done, come back and let me know how compatable the thing actually is so I can add that to my 48 years experience and help others more efficiently. The main issue I see is the Ecobee simply has a single G wire for controlling fan. The ECM is controlled through different amounts of low or dc volts ramping up and down ... When you add up the average cost of electricity and natural gas used for heating and cooling ($1,091 USD/$1,490.52 CAD) and multiple it by 26% (ecobee’s savings claim) you get savings of up to $284/$388 (USD/CAD) per year. Annual savings will vary based on your energy use and location. Learn more about how we calculate savings. Wiring Diagram. A professional drawing. Please excuse the amateur iPad sketch, but this should give a good idea of how it’s wired up. Here’s a legend if any of the colors are ambiguous. Relay ...Score Details. “With an easy-to-use interface, home sensors, and Alexa control, the Ecobee4 is a great addition to your wall.”. Pros. Sets temps based on schedules and geo-fencing. Remote ...To install an ecobee3 smart thermostat, turn off the power to your HVAC system at the circuit breaker. Then remove the cover to your existing thermostat and label the wires. Next, screw the provided mounting plate to the wall and insert the wires into the corresponding brackets before turning the power to your HVAC system back on.Find out if an ecobee thermostat is compatible with your 2- or 3-wire heat-only boiler/furnace system, and what you can do to make your system compatible if it isn't directly compatible. ... ecobee thermostats require a C (common) wire to power on. But you see standard connectors on your thermostat (R, G, W, ...Thermostats 24 Volt Transformer C Wire Power Adapter for Nest, Ecobee, Honeywell WiFi Thermostats, Power Supply for Nest Hello, Ring Smart Doorbells Chime ... Customers are mixed about the c wire. Some mention it's an easy way to add a C wire to your thermostat, while others say it solves the problem of no C wire at the thermostat.Step 5: Install the ecobee thermostat. Following the manufacturer’s instructions, attach the base plate of the ecobee thermostat to the wall using screws. Make sure the base is level. Then, connect the labeled wires to their corresponding terminals on the ecobee thermostat, ensuring a secure connection.Refresh. Skip to Main ContentConnect the G and B wires to the Ecobee 4 ACC- and ACC+ terminals. Then setup the Ecobee ventilator settings. The HRV should already be interlocked with the furnace so the furnace fan starts anytime the HRV is turned on. The Ecobee 4 will start the fan when the HRV runs so this interlock wire is not necessary.If you have an unused wire at the thermostat, you may be able to use that as the C/Common wire instead of installing the PEK. Check the installation guide on the ecobee app for detailed instructions. If you need assistance with a PEK installation, please have photos of the wires at the current thermostat, furnace/Air handler control board along ...Your wiring looks good. To verify if your furnace unit is powered on, connect the thermostat wires RC and Y1 together and see if your furnace and AC unit will power on. I connected those two and it turns on (Edit: the Furnace/AC, not ecobee) Confirms your r/Y are good at the thermostat.How to install Smart Doorbell Camera (wired) In most homes, installing an ecobee Smart Doorbell Camera is an easy process that takes about 45 minutes. Follow the steps below or scroll further to watch the installation video, find wiring diagrams, troubleshooting tips, and more. Check compatibility with your doorbell system and in-home chime.All my favorite HVAC tools: https://www.amazon.com/shop/thediyhvacguy?ref=ac_inf_tb_vhAdd-A-Wire Kit: https://amzn.to/3j2lfDFMy favorite drywall anchors: htt...21,614 Satisfied Customers. Furnace, A/C and heat pump specialist. airheatman is online now. Continue. Weathertron. Changing Og from weather trim to new eco bee. weathertron. Changing Og from weather trim to new eco bee need to no where x2 black wire go and do orange and blue go to o/b on ecobee … read more. RobHVAC.All my favorite HVAC tools: https://www.amazon.com/shop/thediyhvacguy?ref=ac_inf_tb_vhAdd-A-Wire Kit: https://amzn.to/3j2lfDFMy favorite drywall anchors: htt...Hook up the wiring the way you listed it, but leave the jumper between W and Y out. Put the white wire into O on the Ecobee. I've seen these setups many times. leave the jumper out, treat the yellow wire to Y, and the white wire to O/B. report back if its working correctly. The W and Y jumper is there because you do not have auxiliary back up ...Jun 3, 2022 · The standout features of the Ecobee Smart Thermostat are the support for Spotify Connect and Bluetooth Streaming. The installation process for the Ecobee Smart Thermostat without a C Wire is described below. Remove your existing Thermostat after ensuring it works properly, to test if the wires still work. Attach the backplate of the Ecobee ... Compatible with: Amazon Alexa, Apple Home, Google Home, Samsung SmartThings Our top pick, the Ecobee Smart Thermostat Premium, isn’t the absolute easiest model to set up, but it’s the best ...Emerson Sensi is a low-power smart thermostat designed to work without a C-wire in systems that include both heating and cooling. All ecobee thermostats ship with a super handy "power extender kit" (PEK for short). In the photo below, an ecobee3-style PEK (in my hand) and an ecobee4-style PEK (in the background). They are functionally ...1. Connect one yellow wire from the humidifier solenoid to the ACC+ terminal on the ecobee via the extra green wire (C-wire) 2. Connect the other yellow wire from the humidifier solenoid directly to C on the furnace board, thus bypassing the manual humidistat and transformer entirely, rendering those useless to me. 3.

In most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides, wiring diagrams, troubleshooting tips and more. Check compatibility with your HVAC. Download the ecobee app to install your thermostat. Download the ecobee app.. Walmart pharmacy in greeneville tn

ecobee add a wire

17 Feb 2022 ... Comments30. thumbnail-image. Add a comment... ... Easy ecobee3 Install with C wire. ... How To Install Ecobee SmartThermostat 2021 With 4 Wires, No ...I would like to install an ecobee in my apartment, but my current system does not have a c wire and i dont have access to the furnace to install the PEK kit. Any other solution? Call customer support. Get a plug-in transformer to turn your outlet power (110v ac) into 24v ac power, run wire up the wall to the Ecobee. Ghetto, but it'll work.When you add up the average cost of electricity and natural gas used for heating and cooling ($1,091 USD/$1,490.52 CAD) and multiple it by 26% (ecobee's savings claim) you get savings of up to $284/$388 (USD/CAD) per year. Annual savings will vary based on your energy use and location. Learn more about how we calculate savings.In most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides, wiring diagrams, troubleshooting tips and more. Check compatibility with your HVAC system. Download the ecobee app to install your thermostat. Download the ecobee app.Just replace that with the ecobee and get rid of the 2nd thing. Use you 2/5 wire cables to your thermostats to run directly from your new Ecobees to the HZ322 Honeywell Zone Control. Completely eliminate the Redlink devices, and if your wires are long enough, you won't have to use the short pieces between HZ322 and the Redlink devices.The Ecobee Power Extender Kit works by connecting to your home's existing thermostat wires to create a complete circuit; this provides continuous 24-volt AC power to your thermostat for homes that don't have a C wire. Install the PEK on the HVAC system's control board. Ecobee smart thermostats come with a Power Extender Kit included free ...30 Jan 2021 ... Comments97 · How to Upgrade to a Smart Thermostat without Changing the Wiring | Ask This Old House · Best Smart Thermostats 2024 [don't buy one&nb...Same Ecobee style. The Ecobee3 Lite looks identical to the brand's existing $249 Ecobee3 Wi-Fi Smart Thermostat. Both have a 3.5-inch glossy black digital display with a touchscreen interface ...Hire a professional installer to get your ecobee thermostats up and running quickly. Find a pro. Sign up to receive smart home tips and exclusive offers from ecobee. Name. Email address * Join now. By signing up, you agree to receive emails from ecobee. You can unsubscribe anytime.C-Wire-ecobee requires a c-wire, but comes with a c-wire adapter called the Power Extender Kit (PEK).-Nest doesn't require a c-wire. It uses "power stealing" instead. ... Even using the Nest add a wire kit, it can act up and requires making a bigger hole in the wall, the Ecobee kit is hands down better. The occupied reading of their ...2 wire install - adding a common Hey all, purchased an ecobee3 not to long ago and need some assistance with adding a common so we can finally use it. Our current heating system is a boiler with only 2 wires going to the thermostats and the thermostats connect to the taco valves. ... Just saw your edit so yeah, 2 is the common terminal on the ...How to install ecobee4. In most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides and videos, wiring diagrams, troubleshooting tips and more. Check compatibility with your heating (and cooling) system. Download the ecobee app to install your ...The ecobee Smart Thermostat Enhanced and Smart Thermostat Premium can be installed without a C wire by using the Power Extender Kit, or PEK, included in the box. Watch this video …u/Berzerker7 is exactly correct. ecobee is not compatible with your system because it has separate O and B wires. Converting it to use a single O/B wire is possible but very very expensive because it will require replacing the existing reversing valve in your heat pump (outdoor unit). Given that your outdoor unit is old enough to use separate O ...Those two wires appear to be running outside to my A/C unit. I do have power extender kit that Ecobee supplies, but unsure which wire goes where or how to fix easily since there is no C wire running to thermostat. thanks for your help.]2 How to install ecobee3 lite. In most homes, installing an ecobee thermostat is an easy process that takes about 45 minutes. Follow the steps below or scroll down for installation guides and videos, wiring diagrams, troubleshooting tips and more. Check compatibility with your heating (and cooling) system. Download the ecobee app to install your ... Add a gift receipt for easy returns. New (8) from $193.02 $ 193. 02 & FREE Shipping. Other Sellers on Amazon. ... How To Use Ecobee 3 Lite Smart Thermostat & Feature Demo One Hour Smart Home. Image Unavailable. ... Mobile App, Easy DIY, Works with Alexa, Energy Star Certified, ST76, C-Wire Required, New for 2023. 4.5 out of 5 stars ...I would like to install an ecobee in my apartment, but my current system does not have a c wire and i dont have access to the furnace to install the PEK kit. Any other solution? Call customer support. Get a plug-in transformer to turn your outlet power (110v ac) into 24v ac power, run wire up the wall to the Ecobee. Ghetto, but it'll work.Using a short piece of 18 AWG wire, make a jumper and connect it between the Y and G terminals (this is only required if you have both heat and central air). Replace the access panel. Remove the thermostat from the wall to gain access to the wiring. Remove the wire from the G terminal, and connect it to the C terminal.U wire is likely controlling a humidifier or fresh air ventilation. You should stick it in the * terminal on ecobee but you need to find out what it controls Edit, just seen your other pictures. That is a standard 80% furnace. What ever the black wire is going to isn't important at the moment. My guess is that it's controlling ventilation..

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