Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Edit: I should have put this in Controls. I cant figure out how to delete it. Sorry..
Discussion here: https://forum.heatinghelp.com/discussion/162307/steam-boiler-to-tstat-wiring#latest
I have a weil mclain steam boiler. PEG-30A-S-PI, nat gas, single pipe/zone. Trying to wire up a wifi tstat with a C wire.
Old tstat had w from transformer wired to w and y from transformer wired to R/Rc per this schematic. https://goo.gl/photos/VLr1UA58Escsjgcy7
Just ran 18/5 wire and trying to figure out how to wire up new t stat to the transformer properly with a C wire. Should I also connect up R from the transformer? Any help is much appreciated!