topic Re: New nest thermostat, no RC connection in Nest Thermostats

New nest thermostat, no RC connection

Donnie115 — Fri, 23 Sep 2022 18:34:01 GMT

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?????

Re: New nest thermostat, no RC connection

Markjosephp — Wed, 28 Sep 2022 16:42:21 GMT

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

Re: New nest thermostat, no RC connection

Markjosephp — Mon, 03 Oct 2022 23:45:28 GMT

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

Re: New nest thermostat, no RC connection

Markjosephp — Wed, 05 Oct 2022 13:52:19 GMT

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