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Boiler system return flow problem - circ location?
I've got a bit of a jerry-rigged piped boiler system in an old house in Virginia. The boiler was replaced in 2004 - with a new Weil McLaine boiler - but the piping system is from the 1920's I think.
It's one zone supply and return pipe CI radiator system. It appears some larger pipe on the return side was cut
out and down sized as a result of a leak during the boiler changeout and a circulator was added
to a return from the kitchen rad to increase flow to/from this radiator? This added circ.
pumps towards a Tee that brings in a return from a far flung piping branch (upper rear BR) that
is not getting good heat flow. Is this circ on the wrong side of this
tee? What happens when you pump at a Tee like that that should be returning flow from another branch? The larger return pipes further from the Tee to the right seem to
flow fine and perhaps due to pipe size seem to flow/heat well as compared to the smaller piped branches.
Should I relocate that circulator/the branch that it pumps towards - so that branch comes in on the suction side of the circ - and the circ will 'pull' both of those return branches? If it's a certain number of diameters from the larger return coming in - does that insure it doesn't interfere?
See attached photo. All pipes shown are returns. The other/main circ on
the system is on the supply right as it leaves the boiler pumping out of the boiler - but it does pump towards the expansion tank/air eliminator (which I need to change so it 'pumps
away' right?). I'll raise/show that one in another post to see what you guys think.
any thoughts would be appreciated.