Multi-zone primary-secondary help...

hvacfreak

I am building a multiple zone manifold (injection) and I have chosen to drop from the the bottom of the main and thermal trap up ( 12 inches ) with the circuit take-offs. The last job I did with multi-injection we came out of the top of the main and actually had flow through some zones that were not calling ( I did not select the circulators , and yes we had 6 inches center to center on suply / return take-offs. ). Right now the manifold is just copper pipe ( no components installed ).

Will my thermal traps help avoid this unwanted flow possibility ( Dan's book says no , lol..but I ordered it too late )? Should I plan on check valves on both supply and return take-offs ? I just want to use on/off ( not variable )control circulators ( or is this where I'm kidding myself ). All replies appriciated.
- Mike

hr

There is some science to thermal drops

merely droping the pipe below the P/S connection may not cut it. Ask me how I know.

An astute hydronic contractor wiz in upstate NY was able to shine the light for me. Thanks Harvey.

Check out this article before you

proceed.http://www.pmmag.com/CDA/Archives/2df7e8c55e028010VgnVCM100000f932a8c0____

hot rod

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hvacfreak

it seems....

that I missed the boat on my way of thinking. Thanks for that information.