Is this good near boiler piping

keyote

Excuse the hand drawn near boiler sketch dont have a good program for that yet, and i realize lots of bells and whistles missing but am trying to figure out best basic design first. also include the loop views of the zones i did in loop cad but put the totals on boiler plan. I have an extra TT indirect tank and thought to ad solar in future as well as another zone on a fith floor PH addition so all risers are 1" copper.

keyote

hears anoth version of the near boiler

keyote

I dont think this second version materially differs from the first except the secondary is closed in a way which i suppose makes the zones technically tertiary. space is tight down there would it matter and BTW i imagine the secondary ch pump is an alpha

Ironman

Take the return from the indirect and tee it back into the primary return at the boiler, not into the secondary. Use check valves with each pump.

keyote

i understand youd rather see it hit the return downstream of the ch return tee. Turbulence?

Ironman

Hydraulic interference. Your defeating the purpose of p/s with it connected to the secondary.

keyote

Thanks
I corrected the drawings with the idhw return tee downstream of the ch return tee and added check valves, i know theres all sorts of things like separators strainers draincocks close tees and valves etc etc etc not shown yet. but would it matter which version of these two? i show one with the secondary loop closed excluding the zones and the other with the zones being part of the secondary loop is that important

keyote

i dont think the attachments are attaching