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New nest thermostat, no RC connection

Donnie115
Community Member

I have installed a new mirror type nest thermostat. I have a 24v transformer to compensate for my lack of a C wire, R and W only. I know that I connect one of the transformer wires to the C terminal but this unit has no RC terminal for the other wire as my other nest unit does, Where do I connect the second wire from the tramsformer?????

3 REPLIES 3

Markjosephp
Community Specialist
Community Specialist

Hello Donnie115,

 

I'm glad you've reach out.

 

An R wire is needed to deliver power to your Nest Thermostat. The Rc wire from your previous thermostat should be connected to the R terminal on your Nest Thermostat. However, there are some circumstances when they may need to connect the Nest Power Connector or a common or C wire to reliably transmit power to the thermostat. 2 wire setup may result in inadequate power. 

 

To learn more how it works, click this link.

 

Best,

Mark

Hi there,

 

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 trouble about your Nest Thermostat getting a wiring report. 

 

Thanks,

Mark

Markjosephp
Community Specialist
Community Specialist

Hello Donnie115,

 

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

 

Regards,

Mark