05-13-2024 09:08 AM
I have Icomfort thermostat with 2 stage furnace and AC system. The Icomfort thermostat has 4 wires R, I+, I- and C. How can I rewire the Lennox panel to connect Nest thermostat.
05-16-2024 11:39 AM
Hiya Ra-mun,
Thanks for reaching out to our community.
While your current thermostat might not be fully compatible with the Nest Thermostat out of the box, don't worry – let's see what we can do about it.
For the Nest Thermostat to be compatible, it requires wires between 18 and 22 gauge that control functions the Nest Thermostat can understand.
I recommend getting in touch with one of our recommended technicians. They can determine the specific functions of your wires, especially the I+ and I- wires. This will help us check if the thermostat can be rewired to control your current system.
Let me know how it goes.
Regards,
Angel.
05-13-2024 10:30 AM
The wiring diagram for Icomfort thermostat showing the 4 wires R, I+, I- and C - this is for Lennox 2 stage HVAC system (furnace and AC). How can I wire the Nest Thermostat
05-17-2024 07:24 AM
Hi Angel,
Thanks for reply. I am in Toronto, Canada and we dont have Nest Pros here, so I am trying to see if i can setup the system myself.
Any help from the community would be greatly appreciated.
Thanks
05-17-2024 11:25 AM
Hiya Ra-mun,
Thanks for getting back to me.
While I cannot provide you with specifics regarding how to wire your current Lennox panel to the Nest thermostat, there are some specifications you must keep in mind to check if your system is compatible. These specifications will differ depending on which Nest thermostat you're trying to install.
Once you get more information about whether rewiring your system is feasible, feel free to check out this article about the Nest thermostat's technical specifications. This article might guide you on how to wire your system according to its functions.
Let me know how it goes.
Regards,
Angel.
05-23-2024 01:01 PM
Hi,
I have Lennox single stage AC which is connected to the Control circuit Board directly by Y1 and C.
The furnace is connected by R+, I+,I-, C. If i remove these connections and attach directly from the control circuit R, W1, W2, C for Lennox furnace and Y1, C for AC to Nest. Will this work?
Do I need to run a wire from "G" to Nest?
05-23-2024 01:05 PM
Hi Angel,
I have attached photo from the Circuit Board.
If you or someone can help please
05-23-2024 04:11 PM
Hi there Ra-mun,
Thanks for getting back to me.
It's great you could get a direct look at the circuit board. Let's see what we can gather from this now.
We can now see more conventional HVAC system wiring labels. While you could wire directly from the control board, I would suggest ensuring the voltage from those wires matches the 24V required by the Nest thermostat.
I also noticed you have two C wires attached to the system. If possible, I suggest skipping the C wire and seeing if the thermostat works that way. Most of the time, a C wire isn't required. However, if you need one, I recommend having a professional check to see which wire is necessary.
While I don't have specifics on how the Lennox board works, Nest thermostats use a G wire to control the fan. If you can add a wire to the G terminal, it might help you out.
Just make sure to be careful when handling electrical connections!
Let me know how it goes.
Regards,
Angel.
05-24-2024 12:07 PM
Hi Angel.
Thanks for the reply. Few points if you can help -
1. In the two C wires, the one on the left side is coming from AC unit and on the right side is connected to Humidifier. There is R terminal also after the C terminal.
2. So should I connect the R terminal to Nest along with the Y1, W1, W2 and C from the AC unit.
3. Can I also connect the Humidifier terminal R (I think this is power) not sure why humidifier is connected to this terminal
05-29-2024 03:56 PM
Hi there Ra-mun,
Thanks for your reply.
Typically, Nest thermostats require a standard wiring configuration to control your system effectively.
Unfortunately, I can't assist you further with your specific wiring setup. It seems some wires are connected to terminals with seemingly identical functions, and others might be for your humidifier. Based on labels alone, I can't determine the correct wiring or guarantee a safe installation that won't damage your system. Therefore, I recommend contacting a technician for a visit.
I appreciate your understanding.
Regards,
Angel.
05-23-2024 01:03 PM