Wiring compatibility

[Hillbrandp]

Not sure where to plug the black wire on nest thermostat. I believe this is for a Honeywell true air system.

[Vinnyhartlove]

You need to look under your Google nest information via Google or go over to your YouTube and see if anybody has a similar issues and wiring information

[Jeran]

Thank you for helping out on this thread, Vinnyhartlove!

Hey there Hillbrandp,

I'm just checking up on this thread, do you have any more questions or need any additional help?

Best regards,
Jeran

[Markjosephp]

Hello there,

Thanks for assisting, @Vinnyhartlove and Jeran.

I've got some information for you, @Hillbrandp. Different thermostat makers may use the * (star), which Nest Thermostats have, and universal (U, U1, U2) terminals to control the following:

• HVAC accessories (i.e, humidifiers, dehumidifiers, and ventilators);
• For high fan speed in a multi-speed fan system;
• 3-stage of heating or cooling in a multistage HVAC system.

Let us know if you have more questions in mind.

Best,

Mark

[Markjosephp]

Hello Hillbrandp.

I'm checking in to make sure that you've seen our response. Please let us know if you have any additional questions or concerns before we lock this thread in 24 hours.

Thanks,

Mark

[Hillbrandp]

Hello All, 

Thanks for the replies and support! The reader's digest on the fix was that we did not connect the U1 wire (which was controlling a fresh air damper) and instead installed a regulator at the fresh air damper for its own control, therefore allowing full use of the Nest thermostat for heat and cooling needs.

Thanks again!

Hillbrandp

[Markjosephp]

Hi Hillbrandp,

That's great news! Thanks for updating us on your efforts to address your concern about finding a fix, @Hillbrandp. I'm glad that they were able to reconfigure the wiring.

I wanted to ensure you were good to go. Please let us know if you have any other questions or concerns.

Best,

Mark

[EmersonB]

Hi everyone,

@Hillbrandp we're bumping up this thread to make sure that everything is covered. If you have other questions and concerns, feel free to let me know.

I appreciate the help, Mark and Jeran.

Thanks,
Emerson

[Markjosephp]

Hi there,

Thanks for the follow up, Emerson.

@Hillbrandp, It has been a few days since the last reply, and I am going to lock the thread in 24 hours. If you have any questions, please feel free to create a new post.

Regards,

Mark