I'm trying to install a 2nd generation Nest thermostat for my hydronic floors. So it's only meant for heating and not for cooling.
Someone else removed the old thermostat a long time ago so I don't know what the setup used to be.
I see three wires: Red, Green, White. (Red-White shows 30V AC.)
I'm thinking: Red -> Rh Green -> G White -> C
Does that sound right?
Many thanks in advance!