help with Wiring for Google Nest Thermostat G4CVZ

[JohnnyFiveAlive]

Hi-

Can someone tell if me if HVAC is compatible with Google Nest Thermostat G4CVZ

Here's my old thermostat

 

On my old thermostat:

left side:

• orange to y2
• red to s1
• white to s2

right side

• Red to R
• jumper wire from Rc to R
• white to W1
• yellow to Y
• green to G
• blue to B

Where do these wires attach to the Google Nest thermostat with the following 6 inputs: Y, C, W, G, R and *O/B inputs. What about the jumper on the original thermostat? There are S1 and S2 on the old thermostat but no S on the Nest. 

We have a gas forced air system.

Thanks

[Patrick_Caezza]

Give this wiring a try

Orange - Y2 to */OB (set for 2nd stage cooling)

Red - S1 to tape off, not used

White - S2 to tape off, not used

Red - R to R (jumper to RC not needed)

White - W1 to W

Yellow - Y to Y

Green - G to G

Blue - B to C

[JohnnyFiveAlive]

@Patrick_Caezza That worked! Thank you so much.

We have a second thermostat that I just opened up and to my surprise the wiring is different. Can I ask again how I'd connect this to the Nest? We have a 'gas forced air system'

There are three wires connected and two wires not connected:

Current setup:

• Yellow to D 
• Red to R
• Blue to B
• White unconnected
• Green unconnected

Again, how to connect to our Nest Google Nest thermostat with the following 6 inputs: Y, C, W, G, R and *O/B.

I connected it in a similar pattern to our other thermostat. No error messages but the system does not respond. How risky is it to wire it wrong - can it cause any harm?

Thank again - I appreciate your time and expertise.

John

[Patrick_Caezza]

Can you post a picture of it?

It sounds like that one is not compatible

[JohnnyFiveAlive]

@Patrick_Caezza

old thermostat:

• Yellow to D 
• Red to R
• Blue to B
• White unconnected
• Green unconnected

 

[Patrick_Caezza]

That one is not compatible as it uses a proprietary interface that isn't supported by Nest

[JohnnyFiveAlive]

@Patrick_Caezza, thank you for the speedy response. I appreciate it on a Sunday! By any chance do you know if any other smart thermostats might work?

[Patrick_Caezza]

None that I know of.

Try looking around the furnace/air handler and see if an adapter box converts it back to the 24Vac signals.

[Jenelyn_O]

Hi there,

Thanks for reaching out — were you able to check your furnace as Patrick_Caezza suggested? Please let us know, as it will help us to move forward. 

I appreciate your help, @Patrick_Caezza.

Best,

Jenelyn

[Dan_A]

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.

Regards,

Dan

[Dan_A]

Hi folks,

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

[JohnnyFiveAlive]

Can someone tell me where to put these wires into the Google Nest Thermostate G4CVZ

On my old thermostat:

left side:

• orange to y2
• red to s1
• white to s2

right side

• Red to R
• jumper wire from Rc to R
• white to W1
• yellow to Y
• green to G
• blue to B

Where do these wires attach to the Google Nest thermostat with the following 6 inputs: Y, C, W, G, R and *O/B inputs. What about the jumper on the original thermostat? There are S1 and S2 on the old thermostat but no S on the Nest. 

Thanks

[Patrick_Caezza]

Do you know if you have a heat pump or a conventional HVAC?

[JohnnyFiveAlive]

Our inspection reports says  "gas forced air system"... so that's a heat pump right?

[JohnnyFiveAlive]

Our inspection reports says  "gas forced air system"... so that's a heat pump right?

[Markjosephp]

Hello there,

I've duplicated your thread in the main one here. You’ll receive all updates on this issue on the main thread, and we recommend updating and checking this thread when needed.

Regards,

Mark

[JohnnyFiveAlive]

The configuration as posted by @Patrick_Caezza did work. There were no error messages but although the AC worked, the heat did not work. I'm not sure what "Try looking around the furnace/air handler and see if an adapter box converts it back to the 24Vac signals" means. I'll have to have someone help me with that. 

[JohnnyFiveAlive]

CORRECTION, the configuration as posted by @Patrick_Caezza did NOT work.

[zoeuvre]

Hi JohnnyFiveAlive,

I wanted to check and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.

Thanks for the help, @Patrick_Caezza, Jenelyn, Dan, and Mark.  

Best,

Zoe

[Jenelyn_O]

Hi there,

Chiming in — I just want to check if you still have any questions or concerns. Please let us know so we can help you further. 

I appreciate your help, Zoe.

Thanks,

Jenelyn

[Markjosephp]

Hello JohnnyFiveAlive,

It has been a few days since your last reply, and we're going to lock the thread within 24 hours. If you have any questions, please feel free to create a new post.

Regards,

Mark