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Backflow vent leaking.

mike3181
mike3181 Member Posts: 15
edited October 2024 in Oil Heating

Weil McLain Gold

9D-M3 Back flow

Watts pressure regulator 12-15

Turned on heat for the year, lots of air in second story baseboard so I went down to look at the boiler pressure was low almost on zero so I manually added water pressure regulator. 9D-M3 started leaking from the vent afterwards, seeing it was old anyways I just replaced it. Before installing new I did flush out the inlet supply line as to not run any sediment through new back flow. Now back flow still leaks but I believe it is only leaking when the boiler cycles? Pressure on gauge is 14ish at 200° obviously drops as temperature cools off have also have to add water as the air has been working its way out. Any ideas? Thanks!

Edit one thing to add, I know water pressure to the house is above 12-15 psi as I have a pump that pulls it up from the city gauge reads 55psi on that tank.

Comments

  • Big Ed_4
    Big Ed_4 Member Posts: 3,130

    Brass plug

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  • Intplm.
    Intplm. Member Posts: 2,455

    @mike3181 You still might have some debris in that line. Either that or your brand-new BFP is defective.

    Flush and clean that screen inside the thing and flush the water A LOT! I hope this will cure the issue.

  • mike3181
    mike3181 Member Posts: 15

    Thanks! Is it normal to only be dripping when the boiler is firing though? Dry when boiler not firing.

    Can brass plug cause any problems?

  • Big Ed_4
    Big Ed_4 Member Posts: 3,130

    I am not sure if a vented BFP is code for the job …..

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