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will this hydronic circuit work?

ron
ron Member Posts: 301
my current install was done with circulators in the cold input side of boiler and they pump into the expansion tank (which is located where the 4900 air separator is in pic below). I need to replace some valves and was wondering if I move things around according to this pic below (moving circulators after the air separator and pumping away from the expansion tank, and maybe put zone valves on supply side?) will it all work [better?] ?


Comments

  • hot_rod
    hot_rod Member Posts: 18,195
    yes, try not to pipe the circulatory off a tee like that, if the both could run at the same time It’s called bull heading Use a tee and ell
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • ron
    ron Member Posts: 301
    edited August 2019
    can you draw or link a pic showing what you mean by using a tee and ell?

    the hydrostat on the boiler is supposed to de-energize the viridian circulator when the indirect calls for heat.
  • ron
    ron Member Posts: 301
    edited August 2019
    also would like some clarification on bullheading . Does it simply mean to cause or induce a [reverse] flow that is undesirable?

    If so, i'm curious if my current setup has the same possibility although I am pretty sure both circulators will not run at the same time. here is pic of existing setup



    is this what you mean be tee and L ?

  • hot_rod
    hot_rod Member Posts: 18,195
    yep, do the same at the boiler return
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • JohnNY
    JohnNY Member Posts: 3,053
    Hmmm. Are we pumping into the boiler? Is that high efficiency unit or a standard cast iron boiler?
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting
    Plumbing in NYC or in NJ.
    Take his class.
  • Zman
    Zman Member Posts: 7,433
    Be sure the circs have check valves.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein