boiler burners, flame and pressure

aircooled81

When the manufacture calls for 3.5" manifold pressure, what is the lowest pressure to allow at the manifold?
I have a boiler that has the yellow tips of the flames touching the cast iron sections of the boiler, and I am thinking of adjusting the burner pressure lower, to lower the flame height with-out losing blue flame.
Any suggestions?

Mike

Usually 3.5" is the maximum. Check the burner tubes, make sure they're clean inside and out. Do this before making any adjustments.

Jamie Hall

Without the proper equipment to monitor pressure (which should be what the manufacturer calls for, within a very small margin) and the combustion -- CO, CO2, excess O2, temp, all that good stuff -- playing with burner settings is chancy at best. IMHO.

aircooled81

cleaned the burners, checked gas pressure with manometer.
no combustion gas analyzer, so the consenses is leave it at the manufactures spec - or the posted spec on the nameplate is the max.

any opinions on flame height and impingement on the cast iron sections?

Robert O'Brien

If you don't have a combustion analyzer you're wasting your time.

Steamhead

Robert O'Brien said:

If you don't have a combustion analyzer you're wasting your time.

Agreed. Sure, analyzers aren't cheap, but they're much cheaper than lawyers.

aircooled81

Can you recommend a good model analyzer?
I looked at and have used the filedpiece sox3, but it doesnt do co.