Google Nest Community

The markings right to left areR  i+  i-  C

I also have these unused connections on the board. Not sure if they can be used. https://photos.app.goo.gl/4SDbeRZ63aq8fvzn8

I am also trying to replace a Lennox iComfort thermostat with a Nest Learning Thermostat. The iComfort uses unique i+ and i- terminals that I am not sure what to do with. I will attach photos of the connections at both ends. https://photos.app.goo.gl...