Nest Learning thermostat wiring help

[Dlwalsh98]

We are trying to install a Nest learning thermostat and can't figure out the wiring.  We currently have: C, RC, U1, W, Y and G.  Can someone please help and let us know if the Nest Learning is compatible with our system?

thanks

[CoolingWizard]

The wire attached to U1 is a User Defined function that is part of your Old Thermostat.  You need to look at the programming of the U1 and see what triggers that wire.  

AC Cooling Wizard

[Dlwalsh98]

How do I look at the programming of the U1 to see what triggers that wire? Thanks

[CoolingWizard]

@Dlwalsh98 , I will need the Manufacturer and model number if your old thermostat so I can look up the programing mode access. 

AC Cooling Wizard

[Dlwalsh98]

The thermostat is a Honeywell,  Model TH8321R1001

Thanks

[CoolingWizard]

@Dlwalsh98 , this particular model is a pretty advanced featured thermostat from Honeywell. Now that U1, can be programmed to control a humidifier or dehumidifier, a second stage heating or a second stage cooling. Press the MENU icon, then DEALER INFORMATION. Now scroll down and you will see the DATE CODE.  Write it down.  Select DONE. This date code is the installer menu password. 
 With the DATE CODE in hand, Tap MENU then  choose INSTALLER OPTIONS, enter the DATE CODE and press DONE.   Now select INSTALLER SETUP. There will be a 3-digit number followed by a value. Scroll down until you reach 207 and note the value; is it 1 or 2? Scroll down to 800. What is its value?  Now then select DONE. And report back to me the values found. 

AC Cooling Wizard

[zoeuvre]

Hi Dlwalsh98, 

Thanks for reaching out to us. I hope you've already gotten the answer you're looking for from what CoolingWizard has shared. Also, here's a helpful article for you to learn more about humidifier and dehumidifier compatibility.

Please let us know if you still have questions or concerns, as we'll be willing to assist you further.

Thanks for your help, @CoolingWizard. 

Best,

Zoe

[zoeuvre]

Hello everyone, 

@Dlwalsh98, I wanted to check and see if you managed to see the information has been shared. Please let me know if you have any questions from here. I would be happy to assist and make sure you are good to go.

Thanks,

Zoe

[zoeuvre]

Hi there,
 

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 run into any more issues in the future, please feel free to create a new thread.

Regards,

Zoe