NCM 300 Nest TSTAT

[rick62783]

I purchased 2 nest tstats and need to confirm if they will work with my set up. I currently have 18/6 run to each existing tstat and they are only using 4 of the 6 wires. I was told by google that I would need a control wire but they couldn't confirm that my unused wires would work. I am assuming I can take the unused Blue wires and connect to the C for each tstat on the control panel and then connect to the C on the new tstat. Am I missing something? See attached pics for existing setup

[Steven W.]

You just need to hook up the "C" Common wire to the NCM 300 and the Nest thermostat and you will be good.

[rick62783]

Thank you!