Nest R wire confusion

[Kurtis24]

Hello I have a nest thermostat that I just hooked up. When I did the initial test on the website to see if it was compatible I entered the following wires Rc, R, Y, C, W, G with a jumper and it said that it was compatible. When I began the instilation it ask me to list the wires again and I did. It then told me that it wasn't compatible with my system however I found that hard to belive so I continued anyways by only listing that I had an R wire only to receive the no R wire connected error. I then factory reset the device and when prompted to enter the wire types a second time I only entered that I had an Rc wire and no R wire and the system is now working. In my original thermostat the R and Rc terminals where connected by a small permanent metal clip which I believed to be a jumper clip. My question is, what is the difference between an R and Rc wire and is it harmful to my HVAC system to have only listed that I had an Rc wire and no R wire. 

[Kurtis24]

Also to note, in my initial thermostat the wire was connected to the R terminal not the Rc terminal. Thanks for any help or advice. 

[EdwardT]

Hi Kurtis24,

Thanks for reaching out. Instead of using jumper wires, Nest Learning Thermostats use an internal jumper between the Rh and Rc connectors. A Nest Learning Thermostat will automatically use this internal jumper if your system needs it. You can also click on this link to learn more about this.

Thanks,

Edward

[Jhonleanmel]

Hi folks,

Chiming in to see if you still need assistance with this. Let us know if you have additional questions ― we'd love to help.

Best,
Mel

[Jhonleanmel]

Hi everyone,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this thread after 24 hours.

Thanks,
Mel

[Kurtis24]

I did see the response! Thank you very much! No further questions. Have a great day. 

[Jhonleanmel]

Hey there Kurtis24, 

Awesome — glad to hear that your issue is fixed. It looks like we can consider this one complete, so I will lock the thread shortly unless I can help out with anything else. 

Best, 
Mel