JB20-10 Webster Burner

Jalen_Jalen2006

nozzle 6.00 45B delavan LF-HF, PUMP pressure:100/235. Issue is boiler will run and, randomly start to rumble. OHMS shoot up and flame drops out. I had to switch nozzles out for a different reason it had a HAGO. I’m considering my nozzles and or my fuel flow. What do you guys think here

ScottSecor

Sounds like it may be starving for fuel. Keep in mind that I have not touched a Webster oil burner in at least ten years.

Jalen_Jalen2006

https://forum.heatinghelp.com/discussion/comment/1847082#Comment_1847082

I think it is also, they have an underground oil tank.

ScottSecor

Are you able to lock the burner in low fire (sometimes called low fire hold)? If so, does the flame remain stable on low fire?

It might be time to check the vacuum on the pump inlet. An unsteady gauge might indicate a suction leak. Others that still work on oil burners regularly will hopefully chime in.

EBEBRATT-Ed

Agree with @ScottSecor put vac & pressure gauges on they should be steady. Do a combustion test. Establish low fire and smooth ignition. When you get that to work then move to high fire. Is this full modulation or just a two-stage burner? Websters are good burners.

Jalen_Jalen2006

https://forum.heatinghelp.com/discussion/comment/1847104#Comment_1847104

two stage L-H

techforlife

What is the operating vacuum on high fire? Most likely too high.

techforlife

Is there oil in the tank? Suction leak? Slipping pump coupling?