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Nest steam boiler wiring

Community Member

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