topic Re: setting up nest in Nest Thermostats

setting up nest

suelesko — Sat, 14 Jan 2023 19:16:08 GMT

Do I need a C wire to install

Re: setting up nest

straitshooter — Sat, 14 Jan 2023 19:27:40 GMT

It's best if you do but, according to the specs you can install and run your hvac without. It will use its internal battery to control the system. The downside to this is, you will need to occasionally recharge the battery.

Re: setting up nest

BrKorb — Sat, 14 Jan 2023 20:59:14 GMT

NB: "occasionally recharge the battery" will turn out to be quite often. I recommend an external 18V dc power supply.

Re: setting up nest

straitshooter — Sat, 14 Jan 2023 22:22:44 GMT

Negatory on "an external 18V dc power supply". Assuming we're discussing a Nest Learning Thermostat in the USA, its specs indicate 20-30V AC. Nominal voltage via a system transformer, the control circuitry is 24V AC. Dunno if maybe there is a different voltage thermostat for a non-USA application.

Re: setting up nest

BrKorb — Sat, 14 Jan 2023 23:04:54 GMT

Thinko. Yep: 24V dc. Still, the batteries die too fast. My initial install used the 3 connected wires ("C" not connected) and it was less than a month. I was able to find the common connection in the FAU and wire up a "C" connection. That lasted about 8 months. Still not ideal, but I was willing to live with it. The next battery pair lasted 2 days, so I may yet go get a 24 (TWENTY FOUR) volt power supply.

Re: setting up nest

straitshooter — Sat, 14 Jan 2023 23:24:03 GMT

Interesting. Not sure I can offer much more help. It would seem to me that if the thermostat has been connected to a "C" wire (mine is), batteries are no longer needed; except for retaining settings in the event of a system power failure. If you are replacing batteries (such as AA, AAA or otherwise) you have a Nest thermostat that I'm not familiar with. Batteries in mine are non-replaceable in the conventional sense. I never have to replace any battery so long as I am connected to the "C" terminal. My thermostat and system are nominal 24 volts AC current, not DC.

Re: setting up nest

BrKorb — Sat, 14 Jan 2023 23:32:49 GMT

That behavior was my expectation when I got the beast. Mine takes two AA batteries.

Re: setting up nest

Markjosephp — Wed, 18 Jan 2023 20:11:48 GMT

Hello folks,

Thanks for sharing your knowledge here, @straitshooter.

@suelesko and @BrKorb, Thank you for taking the time to let us know about your inquiries. I'd love to know more about this.

Could you please tell us what type of Nest Thermostats you have? I found a helpful article about how common wiring works. Please let us know if that helps.

Regards,

Mark

Re: setting up nest

straitshooter — Wed, 18 Jan 2023 21:40:43 GMT

I have a 3G learning Thermostat controlling a gas fired forced air furnace & air conditioner. I also utilize the * connection to govern a plenum mount fan powered flow-thru humidifier. This required the addition of a 24vac spst relay to cycle the humidifier when the thermostat sensor calls for humidity. All works flawlessly.

Re: setting up nest

Markjosephp — Mon, 23 Jan 2023 21:01:39 GMT

Hi there,

Sounds great! Thanks for letting us know what you've done to have it sorted out, @straitshooter. I hope this will help other users as well.

@suelesko and @BrKorb, I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.

Regards,

Mark

Re: setting up nest

Markjosephp — Thu, 26 Jan 2023 21:08:05 GMT

Hello folks,

I'm checking back in — how's it going? Still need our help? Let us know so we can assist you right away.

Thanks,

Mark

Re: setting up nest

EdwardT — Fri, 27 Jan 2023 22:46:46 GMT

Hi folks,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward

Re: setting up nest

BrKorb — Fri, 27 Jan 2023 22:51:54 GMT

No progress. No helpful information about how to chase down the cause of my battery issue. My issue is better explained here:

https://www.googlenestcommunity.com/t5/Nest-Thermostats/Very-low-battery-replace-now/m-p/341032#M72833

Re: setting up nest

EdwardT — Thu, 02 Feb 2023 01:16:37 GMT

Hi BrKorb,

Thanks for the response. We'd like to know more about this. Please fill out this form so we could investigate further.

Thanks,

Edward

Re: setting up nest

Markjosephp — Sun, 05 Feb 2023 18:45:40 GMT

Hey there,

I'm checking back in — how's it going? Have you had a chance to fill out the form? Please let us know so we can assist you right away.

Regards,
Mark

Re: setting up nest

BrKorb — Sun, 05 Feb 2023 20:10:44 GMT

I filled out the form. I've been waiting for a response for several days now.

Re: setting up nest

Markjosephp — Thu, 09 Feb 2023 17:54:40 GMT

Hello there,

Thank you for your patience with us. I sent a follow-up to the team for an update, so be on the lookout for an email from us in your inbox soon. Don't forget to check your spam or junk folder for any updates, as this thread will be locked within 24 hours.

Regards,

Mark

Re: setting up nest

BrKorb — Thu, 09 Feb 2023 18:13:48 GMT

I got the email from them and they asked if there was anything else they could help with. Needless to say, I said we were not done. Meanwhile, I did find out how to determine the battery resistance. I can't use my ohm meter, but your device measures it somehow.

Battery voltage: 2.75 (1.5 nominal X 2)

Resistance: 2.22 Ohms

Re: setting up nest

Markjosephp — Mon, 13 Feb 2023 19:55:58 GMT

Hi BrKorb,

I appreciate your effort. It appears that our team was able to disclose the best possible option for you. As soon as the process is complete, you should receive two email confirmations from us. But I wanted to ensure that everything was covered here. Please let me know if you need more help.

Best,

Mark

Re: setting up nest

Markjosephp — Thu, 16 Feb 2023 22:11:08 GMT

Hey there,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Thanks,

Mark