topic Re: Nest thermostat gen 4 wiring in Nest Thermostats

Nest thermostat gen 4 wiring

Anthokr — Thu, 20 Apr 2023 18:42:02 GMT

Hi,

Will nest thermostat gen 4 work without W cable? (I have no hearing function anyway)

I have R Y G and do not need fan speed control (it's fixed speed system).

I also do not necessary need on / off FAN. It can stay on as long as the thermostat controls the compressor.

Thanks

Re: Nest thermostat gen 4 wiring

Anthokr — Thu, 20 Apr 2023 19:09:08 GMT

What about model E or Gen 3. Based on some videos I found looks like those 2 will work but not gen 4. Can anyone please confirm?

Thanks

Re: Nest thermostat gen 4 wiring

Anthokr — Sun, 23 Apr 2023 18:41:38 GMT

@CoolingWizard any thoughts?

Thanks

Re: Nest thermostat gen 4 wiring

CoolingWizard — Sun, 23 Apr 2023 19:52:58 GMT

I am not aware of a Gen4. As an HVAC contractor, I tend to sell Nest E Learning thermostats and Gen 3 Nest Learning Thermostats. Sometimes consumers aren’t looking for the advanced learning features, and I will steer them towards the Nest Thermostat. As long as you go with a Nest Learning thermostat or a Nest E Learning thermostat, you can use the Nest app or the Google home app. If you go with the basic Nest thermostat, it only works with the Google Home app. Other than that any model you get that meets the needs of your system will be fine. If you have multiple heating stages or multiple coolings stages, you will need a learning type thermostat.

To see which works with your system, use the Google Nest Compatibility checker. you will need to look at your current thermostat wires and input which terminal letters wires are attached to. The compatibility checker will then make a determination as to which thermostat options are going to be available to you. I hope this helps you, make sure to add Kudo. If my answer solves your question, be sure to mark it as Recommended Answer.

The AC Cooling Wizard

Re: Nest thermostat gen 4 wiring

CoolingWizard — Mon, 24 Apr 2023 03:19:02 GMT

Another problem you have is your wires are stranded wires an the nest backplate is not compatible with stranded wire cables. A proper HVAC thermostat cable is comprised of 18-gage solid copper conductor wires. You contact an HVAC company and have them install a new thermostat cable with 5 or 7 conductors.

The AC Cooling Wizard

Re: Nest thermostat gen 4 wiring

Jake — Mon, 24 Apr 2023 17:32:42 GMT

Hey Anthokr,

Thanks for the helpful replies CoolingWizard.

I wanted to check in and see if you managed to see CoolingWizard's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.

Best regards,
Jake

Re: Nest thermostat gen 4 wiring

Anthokr — Mon, 24 Apr 2023 18:55:54 GMT

Thanks. Yes feedback is very helpful. I will try to install tomorrow

Re: Nest thermostat gen 4 wiring

Jake — Tue, 25 Apr 2023 18:39:30 GMT

Hi Anthokr,

I wanted to check back in with you. Were you able to get everything installed? Let me know if you have any trouble or questions from here, as I would be happy to take a closer look.

Best regards,

Jake

Re: Nest thermostat gen 4 wiring

Anthokr — Tue, 25 Apr 2023 18:42:11 GMT

Thanks for asking.

I am almost there.. I installed and it's working expect that it's not charging probably due to missing c wire. I will try to plug one of those 24v adaptor to simulate c wire.

Based on the pic I shared and usage of adaptor for c wire do you think other nest thermostat version than E pro will work as well? Which ones?

Re: Nest thermostat gen 4 wiring

Jake — Thu, 27 Apr 2023 17:41:41 GMT

Hey Anthokr,

If you are able to install a C wire, you would then be able to use any of the Nest Thermostat devices. If you do not have a C wire installed, the Nest Learning Thermostat, or the Nest Thermostat E would be the best option for you.

Best regards,

Jake

Re: Nest thermostat gen 4 wiring

Dan_A — Sun, 30 Apr 2023 20:03:28 GMT

Hey there,

I wanted to follow up and see if you still need help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,

Dan

Re: Nest thermostat gen 4 wiring

Dan_A — Mon, 01 May 2023 20:32:39 GMT

Hey there Anthokr,

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.

Cheers,

Dan

Re: Nest thermostat gen 4 wiring

Anthokr — Mon, 01 May 2023 20:39:04 GMT

Thanks..I received the c wire 24v adaptator but it's unfortunatly not . working as I expected. I will try one more time tomorrow to connect the adaptor on C and R and keep the hvac system on R as well.

Re: Nest thermostat gen 4 wiring

Anthokr — Tue, 02 May 2023 16:58:37 GMT

good news, it worked!

so in summary I have a very old HVAC system with stranded wires (I simply extanded them to solid coper), jumped wires (R and RC) and no C cable but it worked

Nest E pro

purchased a 24V adaptor acting as C wire

plugged the R, G, Y wires to Nest

plugged the adaptor 2 cables : one in C and one together with R wire

Re: Nest thermostat gen 4 wiring

Markjosephp — Tue, 02 May 2023 21:00:36 GMT

Hi Anthokr,

I appreciate you posting and updating us on your efforts to address your concern and find a fix. Hats off to you! It looks like we can consider this one complete, so I will lock the thread within 24 hours unless I can help out with anything else.

Regards,

Mark