big noise when the burner starts

Val , HVAC technician

I have installed an outdoor reset control on a 1,000,000 Btu/hr H.B. SMITH cast iron hot water boiler.The boiler has a standing pilot.We cleaned the burners with the brush and vacuumed them but when the boiler starts makes a loud noise.I am assuming we have gas leaking inside the burner compartment but I don't know what to do next.The boiler is over 25 years old and had a leak fixed with boiler seal.

Thanks for your help Val

Dale

Gas leak

The idea of a standing pilot is to ignite any gas coming in. You have alot of input for one pilot light so I'm guessing this may be some sort of power burner with a flame safeguard system. If on the other hand this is a long string of burners on a manifold it's not too unusual that some near the pilot burner light and the ones farther away don't right away. Check the gas pressure to the manifold and make sure it's at spec as soon as the main valve is powered. If the burners are in good shape and the cross lighter slots clean and aligned I would suspect a slow opening gas valve. Be sure to check the inlet and outlet pressure to the valve before you change anything. I say valve but now a million input would be 2 valves in series.

mark_40

noise ??

like ... "KaWoof " ?? .... or "Whoomp " ??

Val_2

big noise

Thanks for help. I have learned a lot from this site.
The standing pilot is at the edge of the burners and yesterday I have cleaned some obstructed orrifices near the pilot. The noise is very similar to a small explosion.

lchmb

another thought

I would run that by Timmie at this link

http://www.oiltechtalk.com/discuss/viewforum.php?f=2&sid=f41b009a251c7d6998ee216f592936b0

Have a feeling he can probably steer you in the right direction...

Unknown

Val give me a call

at noon tomorrow on my cell phone and I will see if I can help you. The number is 401-580-2149, I am in Rhode Island so that is noon east coast time. I am in class the rest of the day so that is the only time I am free.

Unknown

Val good to talk to you today

let me know how you made out.

lchmb

make sure

To let the rest of us know to!! Please..:)