EWC Controls Forum

Thanks. Sorry for the extra question, but the nest and the controller both have a shared O/B. My current thermostat has separate O (orange) and B (brown). Which one should get connected to the O/B terminal on the controller and what do I do with the other one. Thanks again and thanks for the quick ...

Hi. I have a York Diamond 80 (with York AC compressor) 2 zone master slave set up with separate O B connections at the thermostat (dampers I believe - no heat pumps), connected to a Trol A Temp MM2. I have attached a picture of the master thermostat (White Rodger 1f80-240 - picture attached. The ...