Heating Help

Draw more

Can you sketch out the rest of the manifolding ( supply and return)? How many feet to the highest pipe? vertical rise? I have seen these things before. Piped in this way the pump at the boiler return was keeping a large header hot and keeping the flow through the boiler. I see some three way valves, if all the three way valves are stroked closed to the boiler supply then the boiler may not have the flow it needs. good luck

Oh well

combined posts - pumping to/away pump math

here's the drawing of the piping and the numbers; is the exp tank to discharge side of pump piped correctly, and is the pump correctly sized?

What is

the circulator on the return being used for ? Is it running it's own zone ? I guess not if it's on 24/7 . Are all the return pipes connected to this circ before it heads into the boiler ?

circs connected to boiler?

i believe so, and here are some pics but it's not easy to see it all

no, unfortunately,

i can't sketch it out because i don't have enough pics and i can't remember it all, but it's a 2 story bldg