Hooking up to steam boiler. Old tstat was two wire. Originally hooked the boiler wires to W and R boiler worked but no constant power to charge the nest.
Got 24v transformer. I know one wire goes to the C. Does the other one go to R and share with the second boiler wire. Leaving the second boiler wire loose nest works but does not seem to kick boiler on.
Nest has 6 terminals. Y, C,W, G, R, OB
