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Properly Sizing Circulators for my Secondary Loops

Will_b203
Will_b203 Member Posts: 1
in Radiant Heating
Hello all,

I' m new to the site. Recently I have installed a used Royall 6150 wood boiler in a new "boiler shed" approximately 80' from my house/shop. I have two manifolds set- manifold A will have 7-300' 1/2" pex loops and manifold B will use 5- 300' 1/2" pex loops. These manifolds will be secondary loops that are tied into the supplying primary loop with the closely spaced tees. I am currently having a little trouble calculating the head to size these pumps. Any information will be greatly appreciated. I will be headed to menards tomorrow and I believe they sell a range of the taco or grundfos pumps. I will be placing one at each manifold.

Thanks,

Will

Comments

  • Zman
    Zman Member Posts: 7,610
    Stop

    Do not go to Maynard's and buy a circulator that someone on the internet told you to buy.

    Read this http://www.caleffi.us/en_US/caleffi/Details/Magazines/pdf/idronics_10_us.pdf

    Slow down and do a proper design based on the heat loss of your home and the type of heat system you have.

    Every week some posts a "wood boiler doesn't work" story.

    Do some reading and get back to us.

    Don't listen to the boiler dealers.

    Carl
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • PLUMMER
    PLUMMER Member Posts: 42
    How can we help

    If you don't give the necessary info. Need all pipe size and length, fittings and specs for special devices and equipment. Even then it might not be perfect. Is your system open or pressurized? I would use bronze or stainless regardless. Then after good to perfect calcs I would buy a VDT or 3 speed pump at least. This will give you plenty of options and adjustment for fine tuning or calc discrepancies. I hope your manifold has flow gauges to also fine tune. Menards does have a good selection , more than what their website shows. But they do not carry the VDT or DeltaP pumps.

    Don't forget if you use antifreeze or boiler additive this adds to the head, a bigger pump will be needed.

    A properly working system always starts with a hydronic design, something most wood boiler companies don't do. I thank them all the time for the work they make for me. Good luck, don't be in a rush, unless you like waste
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