Identifying oil burner

[Elverstown]

Hi guys,
I'm new here, went to service a boiler, a Unidare 120? utility model,and very difficult acess, it was making a lot of flame noise? cleaned and new jet and much better, but no instructions for settings. burner is one I am not familiar with . It is red:smiley2: but has a blue glass? flame viewing plate on the end of it. what is it and anyone know the settings or just go for about 11.5 fg.

 

[Roger Welton]

Nu way boxer?

I'd go for 11-11.5 and confirm heat input is correct for boiler

 

[Best]

Sounds like a Selectos burner. If it has a blue round sight glass, about 3" diameter, then it's Selectos.