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I don't have 18"

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h12721aa
h12721aa Member Posts: 17
in THE MAIN WALL
   I am installing a new boiler and have some problems with dimension.

1)  

 1 1/2" piping coming from the boiler system supply in to the Air Scoop. there should be 18" of horizontal pipe witch i don't have.

2)   

 Between  the supply and the return I should put a  1 1/2" by pass valve. With two Ts and the valve I don't know if that will fit in 5". Must the By Pass Pipe also 1 1/2" or can I go smaller ? The boiler is a Burnham MPO-IQ 84 for two Zone and water heater.

The print shows 1 1/2" pipe lay out.

What to do? going around in loops or what ?

Hilmar

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  • Rich_49
    Rich_49 Member Posts: 2,766
    edited August 2014
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    Air scoop or eliminator

      The 18" rule is a good one to be thinking of but not so important if you have a modern air eliminator as opposed to old style air scoop . Which do you have there ? Send a picture or 2 .
    You didn't get what you didn't pay for and it will never be what you thought it would .
    Langans Plumbing & Heating LLC
    732-751-1560
    Serving most of New Jersey, Eastern Pa .
    Consultation, Design & Installation anywhere
    Rich McGrath 732-581-3833
  • hot_rod
    hot_rod Member Posts: 22,129
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    what size boiler?

    If that is a 64,000 BTU/ hr hot water boiler you could use much smaller pipe, check with the installation manual but 1" pipe should easily move 6 gpm or so.



    1-1/2" pipe needs around 11 gpm flow rate to assure 2 feet per second. You want 2-4 fps to be able to push or pull the air around the piping loop.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • h12721aa
    h12721aa Member Posts: 17
    edited September 2014
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    I don't have 18

    Hi Rich and hot rod

    This is a reply to the question. I don"t have a picture of the air scoop look at the print.

    A Table calls for a flow rate of 4.5  Gal/Min for the MPO-IQ84  = 64000BTU.

    Hilmar
  • Paul48
    Paul48 Member Posts: 4,469
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    Pipe Sizing

    One inch is fine for 4-9 gpm. A spiro-vent has none of those piping restrictions.

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