nu way burner stopping and starting

[gannet]

hi there
i have a merlin boiler with a nu way st50 burner which as just started cutting out then starting up again with a cloud of smoke from the flue it does this 2 or 3 times before it settles down , it as just had a new control box and photoresistor, and solenoid valve,+ new pump filter and inline filter, so i know there ok any ideas what could be the problem ,there is also plenty of oil at the pump,
regards peter

 

[Terrywookfit]

Check oil pressure, head settings, and combustion.

 

[oilhead]

Possibly air setting too high, blowing the flame away from the head, photocell loses flame and reignites; Have you checked the oil pressure? How old is the nozzle, you don't mention changing that.

 

[gannet]

hi there
never thought of air setting but i will check also nozzle was renewed when all other things were renewed not long ago,
i think the pump setting should be 10 bar i will check,
regards peter

 

[Boilerman2]

What colour is the smoke? White, Blue, or Black??

 

[Terrywookfit]

What colour is the smoke? White, Blue, or Black??

We may have a new Pope!!

 

[gannet]

hi there
the smoke is more white than anything,

 

[Boilerman2]

White smoke =
excess air (need a flue gas analyser to set correctly)
low fuel pressure causing poor atomization (pressure guage required)
defective nozzle - replace
incorrect combustion head geometry - (only effects larger ST burners as the small ones have a fixed non adjustable head)
Contamination of the fuel with water or other foreign substance

 

[gannet]

hi there
i have a friend down england he said for a nights b&b he will come up end of september and set it all up for me so i snapped his hand off,let you know how he gets on at the end of the month and many thanks to every ones for there help,
regards peter,