I'm slowly reading what I can bout how these systems work, so forgive me if this is a dumb thing to be asking about.
I'm trying to figure out how my system vents - and it appears to be doing so just fine.
I thought that vents for systems like mine should be at the end of the main to expedite the steam filling it by evacuating air in its way.
The only vent I have is atop the hoffman loop.
I see three routes to the vent:
-in pictures 1 & 2 from the right of the vent, at the far upstream end of the dry return. there's a tee to the hoffman loop
-in picture 1 & 2 from the right of the vent, the same tee noted above, except coming up from the wet return.
-in picture 1 & 2 from the left of the vent, there's an equalizer pipe (I think) coming from the header, going around to the other side of the Hoffman loop
None of these appear to have a direct path to evacuate air from the main, right?
Al I can think is that the air in the main is forced into the dry return through the trap in pictures 5 and 6 (at the downstream ends of the return and the main) and pushed upstream all the way back around the dry return to the the vent. If true, I suspect this would explain why I have not lost any water all season since any steam forced back into the dry return would have to circle all the way back around - and condense along the way - meaning there's no steam vented.
does that sound reasonable or is something else going on?
New owner of a 1920s home with steam heat north of Boston.
Just trying to learn what I can do myself and what I just shouldn't touch