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Best way to pipe 2 Hydronic coils same zone

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Ray B.
Ray B. Member Posts: 3
Looking for best way to pipe in 2 hydro coils in existing duct work, same hydronic zone as not to overfeed 1 coil & vs other. Was thinking just putting in full port ball valves on return of each coil for balancing? 1 coil is 10x10 & other is 22x12. Thanks for the help!

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  • hot_rod
    hot_rod Member Posts: 22,254
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    A dedicated circulator for the two? Do you know the required flow rate?

    This is a user friendly "setter" it allows you to set, confirm, and check flow rate.


    https://www.caleffi.com/sites/default/files/file/01149_20_na.pdf
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Ray B.
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
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    Reverse return.
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
    Ray B.
  • Keith M
    Keith M Member Posts: 78
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    If the coils are the same with same pressure drop, Solid Fuel Man is correct...use reverse return.
    Ray B.
  • Ray B.
    Ray B. Member Posts: 3
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    Hot Rod Yes dedicated circulator for the 2 coils. 1 coil is 2.5 & other coil is 5 GPM (just coil) . approx 25-30' of piping (1 way). Total Btus approx 95,000 (1 coil is 24.7 k Btu & other is 70k)
    1" pipe I'M assuming? Thanks in advance
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,613
    edited December 2019
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    Reverse return is the best way but with two different size coils you still need to put balancing valves on each coil. Ball valves are not good to balance with. 1" is ok for the mains 7 gpm for the mains. 3/4" for the coils.
    Ray B.
  • hot_rod
    hot_rod Member Posts: 22,254
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    A wide array of balance valves available, depending on the accuracy you want and the $$ you want to spend.

    Ball style like the B&G Circuit Setter or Caleffi 132 quicksetter are perhaps the most common.

    Or a fixed orifice type, variable orifice style, PIB pressure indépendant.

    The Quicksetter may be the only style with the gpm readout built in. Most others would require a ∆P gauge connected to the test ports to dial in and exact flow rate.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    Ray B.