Immergas ARES PRO 150 Instructions And Recommendations page 39

D - Provisionally secure the flanged curve 5 to the cover
(do not tighten the nuts 4 fully).
F - Centre the burner between the electrodes, same
distances (approx. 8-9mm)
E - Now complete securing the flange to the burner.
Inspections and maintenance
Scalding hazard!
39