Primary Secondary piping

Roxshock

I ran across this piping diagram on a job bidding this month. Based upon what what I've read and researched on Primary/Secondary this piping arrangement will not work. The system loop is 3" .  Can anyone comment???

Roxshock

Drawing of system in question

Here is the drawing I am refering to

Rich L_5

Drawing?

I still don't see a drawing?

Roxshock

Drawing

This is the third time i tried to send out the drawing but the attachment does not show up.

CMadatMe

PDF Files

cannot be uploaded. Only pic files. Been down that road too. Dan offered to put these in the library under the resource section, I e-mailed him the Taco Wiring Guide and he put that on there. May do the same for you. Just ask.

Roxshock

Here is the drawing

Thanks for the help. Needs to be a .jpg file

Jean-David Beyer

That is almost primary-secondary piping.

N.B.: I am not a professional.





I think it would work and is essentially primary-secondary piping, but it does not agree with the diagrams I have seen for doing it with multiple boilers.



From my reading, both in the installation manual for my W-M Ultra-3 boiler and from Figure 3-27 of John Siegenthaler's book, "Modern Hydronic Heating ..." 2nd Edition, it looks as though one should use one set of Closely Spaced Tees (in the boiler part of the system). The supplies from the individual boilers connect through individual flow-check valves to the stem of the T downstream in the secondary circuit. The downstream stem from the T upstream in the secondary circuit goes to the return to the boilers. Use suitable isolation valves here and there. The system in the diagram uses two less Ts, so it may make sense.