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Nozzle angle & flame impingement
I have a hot water boiler with an old Carlin 101 CRD. The manual for the burner calls for a Hago 60 degree SS nozzle.
The oil company techs have been installing 60 degree All Purpose nozzles for years and the flame has been impinging on the back wall of the refractory firebox and its starting to crack.
I installed a 70 degree SS nozzle and the flame did not impinge on the back wall.
Then I installed a 60 degree SS as per the manual and there is a very slight flame impingement.
My question is should I stick with the 60 degree or go back to the 70?