Automatic burner control unit for atmospheric burners e.g. Viessmann (7383150) Atola-RN type ARN and AVB, Litola type LV, LVB and LVR, Rexola-triferral type RTF, Vitogas 100 type GS1 11-60 kW, Vitogas 300 type GS3, 230 V, 50 Hz, start-up safety time <50 sec, Nominal safety time 30 sec., operating safety time <1 sec., start-up waiting time approx. 3 sec., flue gas shut-off temperature >65°C, ambient temperature 0-60°C, flame monitor ionization, flue gas sensor NTC R25 1MOhm.