Thank you. Exactly what I needed to install my Honeywell T9 to my gas fireplace. After spending time looking at the wiring on my fireplace and searching the internet I came across your video which was exactly what I needed! Saved me a visit from my HVAC guy!
Thanks from Australia. Exactly what I needed. Most of the vids emphasised the C wire without telling me where to connect the switch wires for a two-wire system. But you nailed it.
Thank you for this video. I struggled to power my ecobee until I came across your video which showed me how to provide power to the thermostat. I have a two wire (Red and White) thermostat connected to baseboard heating (zone valve.) Luckily, I have access to a 24v transformer near the boiler and a spare wire coming to thermostat. Here is how I wired my ecobee: 1. Connect spare wire to 24v transformer labeled “Load” 2. On the thermostat end, connect spare “Load” coming from 24v transformer to ecobee ‘Rc” 3. Connect “Red” wire to ecobee “Rh” 4. Connect “White” wire with a jumper wire to ecobee “C” and “W1”. Please note; if you follow “White” wire back to the boiler you’ll notice it is connected to 24v transformer labeled “C” which provides power to zoning valve by completing the circuit when connected together with “Red” wire. Here is my diagram: drive.google.com/file/d/1Yx79pAtcSoadQqdU5ahQ6bVnKpcVWkKA/view?usp=drivesdk drive.google.com/file/d/1EG9Mvh_5hMfv6a7IDKoE2CIxKBvIyc1V/view?usp=drivesdk Hope this schematic diagram helps anyone with similar problems.
Thank you, RR. I bought a wifi thermostat not knowing about the C-wire. I was about to throw in the towel when I discovered your video. You explained it to a 'T' and I had the unit installed and working in no time. I have liked and subscribed because I am sure I will see new videos that will be helpful to me. Thanks, again.
Thank you so much! I have an old gas stove-style heater that doesn't have the terminals described for the adapter kits for the smart thermostat I bought without thinking about compatibility. I never had a thermostat that needed more than two wires before. This is exactly the solution I needed.
I bought a 24 VAC 40VA trans. and still could not get my nest or Honeywell thermostat working and gave up on both a week ago, for some random reason your video came upon youtube and now the Honeywell works perfect, I can not thank you enough Liked and subscribed.
Great job. When I remodeled the house I Ran a 5 wire cable for future upgrade but also left the two cable next to it and taped it off, now all I have to do is get a transformer and make good use of the two cables dangled in the basement. I'll just put an outlet in for the plug.
Once again you have helped another person! I used an oil burner transformer in my boiler room and used the same steps. Fished a new line all the way downstairs. Worked like a charm. thank you so much. Worked with a Honeywell 9000.
Amazing video... thank you. I have a boiler with no C wire running to thermostat. Bought the Nest and did not realize the issue until I got home.. Initially I had set it up where the Nest was power stealing from my boiler, but issues started to arise when it got really cold, and the Nest started to power out (all functions would auto turn off to compensate for the fact that the boiler needed the to run more often). Anyway took your reco and took it a step further and bought a 24V transformer that I installed inside the wall from the nearest power outlet - brushed up on my dry walling skills. Works beautifully now.. Cheers!
Noticed that you connected the black wire from the adapter to the C terminal and the white to the RC. Is that interchangeable or not? I have an Ecobee+ and would need to know. BTW, excellent video.
Very nice easy demo. I just purchased two of these Honeywell thermostats and this made it very easy to figure out how to install without a C wire... Thanks!
Random Repair I kept thinking all this time the C wire is supposed to be hooked into the furnace and not one video showed me where the C wire goes to on the furnace end. But you cleared it up
thank you great video. I have been wanting to install a wifi thermostat for a while on my 2 wire hydronic system. this video showed me how to do it. got the transformer on amazon and my thermostat from home depot and i was ready to install them. install took about an hour. hardest part was fishing the transformer wire down from the thermostat wall hole to an outlet box in the wall behind the thermostat after my fish tape broke.
Thank you Very much for this video, I had asked some coworkers if they could help me with this problem and none made the time (my guess was they did not know how) Now I finally have my WiFi Thermostat connected!
Thanks, my Nest worked fine for 2 years with no C wire then all the sudden on one of the coldest days it reports an error that when I googled said it needs the C wire for power. This solution fixed my issue ordered the 24 Volt AC transformer from Amazon
Great video. Nice guy! I hate the idea of a huge transformer sticking out of the wall but I also hate not being able to use this damn Honeywell thermostat that I bought in ignorance. I’m going to do my best to get behind this wall and hide this transformer on the other side and feed the C wire through. I want to also thank you for taking the time and effort to do this video. I keep telling myself to start a channel but I’m too busy doing all this other stuff and learning from folks like you. So THANK YOU 🙏🏽
Definitely helped with the confusion of missing C wire. THANK YOU!!! Would you please mention the model of thermostat too. I have decided to get Honeywell (RTH6580WF), Requires C Wire, Works with Alexa - It better work with Alexa
Thanks chief for the video greatly appreciated got a house from 1958 so I'll be able to punch out walls whatever I need to do the unit is from 1990 I'm going to try to just take two wires off the switch itself on the furnace because they give me 24 volts actually 29 volts but what the hell is the difference unless I can find 24 volts elsewhere all the time anyhow if that doesn't work I'll do your method I'll just plug it in the basement so you'll never know considering that where the blower motor is attached there is an open 3-prong so yeah this will work for me Good video I just subbed
If I only have a heater, no cooling, should I bother hooking up a wire to the Rc connector? What is the purpose of connecting to the Rc connector? Thank you for this video, going to test this weekend!
My old thermostat wiring had no C-wire, only 4 wires: R, G, Y, W. The heater has 230/24V transformer with 24V Common wire grounded. I replaced the thermostat with a Nest smart one. Connected the Nest's C terminal to nearby 120V outlet's ground terminal, got 24VAC between R and C terminals. The Nest has been working without issues.
Best and simple video, after months of reseach I finally got it thank to you. If I connect a wifi thermostat to central ac, do i connect 1 wire to C terminal n the other to RH
I'm seeing so many homes in these types of videos that don't have a common wire feed to the t-stat, why is this so common? Is it because installers aren't running new 18/7 or 18/8 t-stat wires when upgrading older HVAC systems, and are opting to wire them up using the existing 18/5 or 18/6 feed from the old equipment?
What is the maximum amp rating I can use for this method? The one in the video is 0.5 amp, but is there a maximum? Also, will this work with Honeywell lyric T5?
I don't have a C wire and will be running one like you showed but I have a RH and RC wire attached in the RC and RH spot. Would I then connect one of the transfer wires with the wire already in the RC spot and the other in the C spot? I've been searching online and thankfully came across your video which is most close to my situation. I greatly appreciate any help you can offer 🙏
Thanks so much for this video. It was extremely helpful. I now can control the heat settings in my cold shop from home. I now can come to a warm workshop. I would suggest an alternative for the adaptor if you know of one. This part was hard to find. I got lucky to find one on kijiji but had to drive an hour away and paid only $10 for this part. This video saved me on installation cost. I was able to follow your instructions to do this myself. No bad for a girl!
my Nest doesn't have a Rc terminal. only R. It's a 2020 model. The only terminals in the Nest are Y, C, W, G, R, and OB*. which terminals should I use to hook up the red and white wires going to the furnace and the 2 wires coming from the transformer? Put one transformer wire into C and one into R (along with the red wire from the furnace)?
Great instruction, I have three wire system with C (W, Rh, C) wires. The thermostats powers fine, but when the heat turns on the thermostat lost power. The thermostat power on/off cycle every 2 second. What is the problem? Why it cannot maintain power when you turn on the heat?
I have a 24 volt transformer attached to the furnace. It is part of the control circuitry for the furnace. Can I piggy back on the 24 volt output and run cables to my wifi thermostat?
Does it matter which wire goes where on the transformer? Looked at close up pics of the Honeywell 32006131-001 and the terminals are not marked at all. Is it like a light bulb, meaning it will work either way?
What wi fi thermostat do you recommend that I can use my phone/Tablet also thermostat is password protected that nobody can turn on furnace and jack up the temp, I can control it while I'm at work or out of town, as for C wire I have plain ol gas furnace nothing fancy it not central heating. Will it still require C wire? And the wi fi thermostat is in very budget friendly, don't need all the fancy bells and whistles I just want the thermostat that is password protected so no one can turn on furnace and jack up the temp and I can turn off furnace while I'm at work or out of town.
The C wire adapter that is already one wired unit are the 2 wire interchangeable when connecting to the new thermostat? I noticed the wire adapter 2 wires are not color coded at the connecting end. Tia
Hi I connected an emerson Sensi with a 24v transformer for like a month now with my boiler and the thermostat been working fine but I forgot to remove cut the in built jumper so should I cut it now or leave it
Thank you for your video. I purchased the transformer and wired it similarly to your description. I have an older Honeywell thermostat that doesn't have the WiFi capability and was testing to see if the transformer and wiring you described would power up the old thermostat. It has a backup of 2 AA batteries. I took the batteries out to see if the new wiring would power up the thermostat. The only main difference to the wiring from the video and my thermostat is that there isn't a C slot but a G slot. I understand the G is interchangeable with the C. Correct? If not, please advise! Thank you. My intention is to buy an Ecobee SmartThermostat to replace the old Honeywell.
@@randomrepair1680 Thanks for the quick reply. Unfortunately, it doesn't power up the old Honeywell thermostat unless I install the two batteries. Any ideas why? The transformer is working.
Is it safe to power two thermostats off of one transformer? I like this version more because this wire can be run behind walls. Those “c-wire adapters” with the the thin wire found on Amazon may be violating electrical codes.
My Thermostat cable has two additional unconnected wires (blue,black). If one tests hot for 24V, should that become the "C" and assume the other is "RC"?
Thanks, very helpful video. One question before i embark : I got a transformer from AGPTEK and its output wires are both black color, does the coloring or polarity matter which way i connect these to the thermostat ?
My nest isn't getting any power from this setup. Do have any ideas on why this is happening with a setup like you just did but with a different 24v transformer.
You don't have to plug in at the thermostat. If you run a new thermostat cable you can put the transformer at the furnace end and send the 24V to the thermostat from there.
I already have a wire going to Rc and Rh, but no c-wire. One goes to C, of course, where should the other wire go? Can I just remove an Rc or Rh and cap it off? Then install the other? It is a nest.
In this video it already looks like W is your common point from the basement. Then, that R/jumper/Rc provide power too. Therefore, the boiler fires. Maybe, for this video why not try to add an additional jumper between W/C...instead of that red-R wire coming from the basement?
so many of the thermostats that just have two wires going to them have either a two pair wire like the old phone jacks which has four wires or even "3 pair" or "5 pair" or "7 wire" or any number of different low voltage wires to them from the furnace controllers I see how you have the two wires from the new Transformer but if all you need is a C wire and you have extra wires going to the thermostat from the area around the furnace which are not attached to anything wouldn't you be able to take one wire and run it to a terminal on the transformer in the furnace room to give you power to that C wire terminal on the thermostat or do you absolutely need to have the wire going to the jumped Rc terminal as well and additionally could you run both of them from the Transformer by the furnace???
My system did no start at first I reverted W1 and RH and it starts right on the spot it could have been that wire wasn't fully inserted that's all I can think of. You are a Saviour or at least for 1 day.
Hi. I just bought honeywell RTH8500 for my duplex which only have a gas boiler and no AC. What system type (0170) will I choice? is it heat only (no fan) or heat with aux pump?
*Is the Rc and C wire interchangeable? My power transformer just came with 2 wires, both black, not color coded. Does it matter which wire goes to Rc and C?*
