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Hammerring Peerless

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clayman
clayman Member Posts: 1
in Strictly Steam
We just removed a failed Weil McLain 76 Series, 4 Sec firing 1.65 g.p.h. oil. It was in a house that was remodeled several times and has other heat sources for different parts of the house. The core of the house being heated by this boiler has 571 sq. ft. of radiation. We thought the old boiler was too big and installed a Peerless ECT 5 section rated at low fire for 1.75 gph and 663 sq ft radiation. We installed it with a 3" header. The old one was 2". We have "skimmed" it several times and this last time used Tri-Sodium Phosphate at the prescribed mixture. We lowered the nozzle to a 1.00 with an effective rate at 140 psi of 1.20 gph. The boiler continues to hammer after long runs about 15' down the main. This last time there we stayed 30 minutes while it ran and no hammering. But the customer has just called back with hammering and ambient is 18 and dropping. We do not believe there are any vents in the mains but we will be going in those crawl spaces. We believe the radiator vents are OK as the radiators are heating well. Any thoughts out there where we should look next?

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  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,578
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    Hard to reach vents

    If this is a counter flow system, then you are stuck with some quality time in the crawl space, but if it is a parallel return, then the ends of the dry return would be best for the main vent location. Use big vents, as you do not want to be going into the crawl space to add any more. Peerless has a definite diagram for the header on a counter flow system.

    Keep the pressure low, as much under 2 psi, as possible.--NBC

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