Is my wiring compatible?

[Mahesh159]

Is my wiring compatible? Current Trane thermostat has only 3 wires connected ( red, blue and green) but there is white and yellow extra wires available.

[MelbaDT]

Hey Mahesh159, 

Thanks for reaching out to the Google Nest Community. 

Could you share a clear photo of your current thermostat showing the terminal labels where these wires are connected to so I could take a closer look? Also, what system do you have?

Best, 

Melba

[Mahesh159]

Hello!

I have a Trane system. It is also a smart system.

There are 5 wires currently-

Green - connected to “D”

Red - connected to “R”

Blue - connected to “B/C”

White - not connected 

Yellow - not connected 

I hope it helps.

 

[Ryan_G]

Hi Mahesh159,

Thanks for reaching out here in the Google Nest Community and for including the photo of your thermostat wiring.

Based on the photo, it looks like the wire labels aren't the same as the Nest Thermostat. If you're going to use the Online Compatibility Checker, it will show you that it is not compatible with the Nest Thermostat because of the different wiring labels. However, we could still take another chance by looking at the main terminal block on your HVAC unit and check where are those wire connected to. By then, we'll be able to further tell if it is compatible or not.

I hope to hear from you soon.

Regards,

Ryan

[MelbaDT]

Hey there, 

Checking back in — have you had the chance to check on your HVAC's control board to confirm where your current thermostat wires are connected to?

Best, 

Melba

[JenniferV]

Hello Mahesh159,

We haven't heard from you in a while so we’ll be locking this thread if there’s no update within 24 hours. If you're still experiencing problems, please feel free to start a new thread and we'll be happy to help.

Thanks for the help here, Ryan and Melba.

Regards,

Jennifer

[Mahesh159]

Hi, 

what exactly would you need to identify? I am not sure. Picture of HVAC control board?

[EdwardT]

Hi Mahesh159,

Thanks for the response. If you have access to the control board of your HVAC, please share a photo showing the terminals where the other end of your wires are connected to.

Thanks,

Edward

[Jhonleanmel]

Hey folks,

@EdwardT, thanks for the help.

@Mahesh159, 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 concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,
Mel

[Jhonleanmel]

Hi everyone,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

Thanks,
Mel

[Mahesh159]

Hello everyone,

Sorry for the delay. Here are some pictures.

 

 

 

[Markjosephp]

Hi Mahesh159,

I'm sorry for the late reply. I wanted to ensure everything is covered here and see how I could help.

Thanks for sharing the pictures. By any chance, do you have a picture of your system's control board showing where the wires from your thermostat are connected to? This is to determine if the 2 bare wires are being used and to tell which terminals we should connect them to the Nest thermostat. Also, do you have a dehumidifier?

Looking forward for your response.

Best regards,

Mark

[Mahesh159]

 

Thanks Mark!

yes I do have a dehumidifier. Here is the picture of relay box. Hope its helpful

[Markjosephp]

Hi there,

It's me again. Thanks for sharing the picture of your control board. That helps!

Based on the configuration, it appears that you have a heat pump type system. Your system may still be compatible with the Nest Learning Thermostat. However, with the current wire set up from your thermostat, you might need to contact the HVAC technician or your contractor for the installation to reconfigure it.

Feel free to let us know if you have more questions in mind.

Best regards,

Mark

[Markjosephp]

Hi Mahesh159,

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

Best regards,

Mark

[Markjosephp]

Hello Mahesh159,

Chiming in to check if you have additional questions or concerns as we will be locking this thread in 24 hours.

Best regards,

Mark