Wiring from Honeywell Home to Nest

[Hoosiers228]

I have two Honeywell Home units in a newly built home I just moved into.  The Units are TH8321R1001. 

Oddly, see below the units are wired differently even though I believe they are the same HVAC units.   

When I switch to the nest learning thermostat is the following correct for the units wiring?

Unit 1: 

C-> C

R -> RH

W -> W1

Y -> Y1

G -> G

For Unit 2:

C-> C

Rc -> Rc

U1 -> * ?

Second U1 -> ?

W -> W1 

Y-> Y1

G-> G

W2 -> W2

Y2 -> Y2

[Markjosephp]

Hello Hoosiers228,

Thank you for taking the time to let us know about your inquiry.

Your wiring setup is correct. Please note that the U wire terminals are used to control indoor air quality equipment, such as a whole-house humidifier or dehumidifier or a ventilation system. Some systems may be controlled by a separate panel as well. But to be sure, could you please verify if you have one? Also, the make and model of your HVAC system.

I'll look forward to your response.

Regards,

Mark

[Jenelyn_O]

Hi there,

Chiming in — could you please provide the information asked above? It will help us to move forward.

I appreciate your help, Mark.

Thanks,
Jenelyn

[Hoosiers228]

Hi I was told the system has a fresh air feature.  I will share what system it is shortly.  So it isn't a dehumidifier but a system that evidently allows fresh air every so often...

[Jenelyn_O]

Hey Hoosiers228,
 

Gotcha! Thanks for the update. Please keep us posted if you were able to get the details of your HVAC system.

Best,

Jenelyn
 

Best,

Jenelyn

[Markjosephp]

Hello there,

Thanks for assisting, Jenelyn.

@Hoosiers228, I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Regards,
Mark

[Markjosephp]

Hi Hoosiers228,

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