topic Re: Wiring compatibility in Nest Thermostats

Wiring compatibility

erwinespi — Thu, 11 May 2023 03:37:53 GMT

Hi everyone,

Can you help me what wiring do I need to follow. I’m just a little confused. I have a heat pump. Everything is electric. Thank you in advance.

Re: Wiring compatibility

CoolingWizard — Thu, 11 May 2023 06:03:50 GMT

Your current thermostat handles the Auxiliary Heat differently. Here is how you will wire your Nest Learning Thermostat.

R - Red Wire to Nest Rc

B/C - Dark Blue wire to Nest C

O - Orange Wire to Nest O/B.

Y1 - Yellow Wire to Nest Y1

G - Green Wire to Nest G

W1 - White Wire to Nest W1

AUX - Black Wire to Nest W2/AUX

I hope that this helps you.

AC Cooling Wizard

Re: Wiring compatibility

erwinespi — Thu, 11 May 2023 06:18:17 GMT

Thank you @CoolingWizard I also have another thermostat upstairs in my house but all runs to 1 unit with zoning capability. Can you help me figure out the wiring for this? See pic. I’m planning to get just the Nest smart thermostat. Not the learning. Will this be compatible?

Thank you again!

Re: Wiring compatibility

Patrick_Caezza — Thu, 11 May 2023 06:51:34 GMT

@CoolingWizard

The Black wire connected to the right AUX1 terminal is not AUX heat. It probably controls either a humidifier, dehumidifier or something similar. The yellow wire is supplying 24V to the left AUX1 terminal.

Re: Wiring compatibility

erwinespi — Thu, 11 May 2023 14:29:45 GMT

@Patrick_Caezza what do you suggest for me to wire it properly? Thanks

Re: Wiring compatibility

CoolingWizard — Thu, 11 May 2023 17:15:21 GMT

It still might be Auxiliary Heat @Patrick_Caezza , this is a Heat Pump so it mignt require an inspection or a Nest Pro installation.

AC Cooling Wizard

Re: Wiring compatibility

CoolingWizard — Thu, 11 May 2023 17:24:39 GMT

Hello @erwinespi , this is a fairly straight forward installation for a heat pump. Your control wires being used are

C - Dark Blue wire to Nest C

R - Red Wire to Nest R

W1 - White Wire to Nest W

OB - Orange Wire to Nest *

G - Green Wire to Nest G

Y1 - Yellow Wire to Nest Y

AC Cooling Wizard

Re: Wiring compatibility

erwinespi — Thu, 11 May 2023 17:32:46 GMT

@CoolingWizard so the directions you sent will work right?

Re: Wiring compatibility

CoolingWizard — Thu, 11 May 2023 17:46:52 GMT

We need to see your furnace and look for the auxiliary heat or if there is a Humidifier attached. Your system will work as I have stated.

AC Cooling Wizard

Re: Wiring compatibility

Jake — Wed, 17 May 2023 17:51:24 GMT

Hey erwinespi,

Thanks for the help Patrick_Caezza, and CoolingWizard.

I wanted to follow up and see if I could be 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.

Best regards,
Jake

Re: Wiring compatibility

erwinespi — Sat, 20 May 2023 05:01:11 GMT

@Jake So I had it wired already and it’s working fine so far. I’m not sure though if I chose the right setting on the fuel system. I have a heat pump and electric furnace. Is that considered as dual fuel system? I’ve seen various answers all around. Please help. TIA.

Re: Wiring compatibility

erwinespi — Sun, 21 May 2023 00:04:43 GMT

@CoolingWizard I did wired it per your directions. So far it’s working ok. On the initial set up, I’m not sure if I should put single or dual fuel system. I have a heat pump and electric furnace. Not sure why it’s showing that my alt. heat source is gas.

Re: Wiring compatibility

CoolingWizard — Mon, 22 May 2023 07:16:23 GMT

Your system is not a duel fuel. Your system is all electric. Duel fuel is electric and natural gas, or propane, or healing oil.

You can change the equipment system in SETTINGS > EQUIPMENT and scroll to Heating, and change the heating type to electric heat pump. Then your W2 will be auxiliary heat

AC Cooling Wizard

Re: Wiring compatibility

erwinespi — Mon, 22 May 2023 15:07:29 GMT

@CoolingWizard I tried to change the setting but I don’t see the option to change the heating type to electric. It only allows me to choose just these options: Forced air, in-floor radiant, radiators and more info.

Re: Wiring compatibility

CoolingWizard — Mon, 22 May 2023 18:18:21 GMT

Ok, I see the problem. You have a the Nest Thermostat and not the Nest Learning Thermostat. I am not as familiar with the basic nest model. It might be in Nest Pro sub menu.

AC Cooling Wizard

Re: Wiring compatibility

erwinespi — Mon, 22 May 2023 18:30:25 GMT

@CoolingWizard I do have the Nest learning thermostat. The $250 one at Bestbuy. I returned the basic Nest due to incompatibility with the Nest app and sensor.

Re: Wiring compatibility

CoolingWizard — Mon, 22 May 2023 22:30:34 GMT

Then you should be able to go to SETUP > EQUIPMENT > CONTINUE > CONTINUE > HEAT TYPE, and select ELECTRIC then select FORCED AIR followed by DONE.

AC Cooling Wizard

Re: Wiring compatibility

erwinespi — Mon, 22 May 2023 23:42:35 GMT

It doesn’t go to that electric option. After the choosing heat type, it goes to forced air then that’s it. I actually did a full reset to start over but then when I went to select the single fuel, it won’t let me choose it and asking to hire a professional. The only choice was to select dual fuel in order for me to proceed to compete the set up.

Re: Wiring compatibility

CoolingWizard — Tue, 23 May 2023 00:44:20 GMT

Ok, you are ok. Let’s take one more step. Go to SETTINGS > EQUIPMENT > CONTINUE > CONTINUE > PRO SETUP > CONTINUE. You will now see the back plate with colored wedges. Green are ok, Yellow mean they are connected but not functionally defined. You rotate ring to a yellow wedge and select it. Then define its function. For example W2 is Auxiliary Electric Heat. In Pro Setup, you change any active wire and change its function.

AC Cooling Wizard

Re: Wiring compatibility

erwinespi — Tue, 23 May 2023 01:01:21 GMT

So I changed the W1 and W2 to electric. What’s next? I also have a Nest learning thermostat upstairs which I had no issue with that setting it to single fuel. Will that be ok that I have the downstairs as dual fuel setting and upstairs as single fuel? Or keep them both at a dual fuel even though I’m all electric and just change the wiring function like what you said?