I've got an old steam furnace and would like to add a common wire. The wire is already ran, I just have no idea where to connect it.
I thought it would go to TR but that didn't work. Thanks in advance, much appreciated!
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Found this link here stating that the blue C wire is the 24V AC transformer Neutral wire, hope this is of some use to you.
After looking more closely I'm thinking the way everything is currently wired it isn't possible to get a complete circuit for the C-wire. I made a proposed diagram that makes a little more sense to me, but I am definitely no expert so I'm looking for advice. Would this work?
I tried to edit the original question but it wouldn't let me post an additional photo.