1. Gas pressure control, measuring and safety system2. Manual valve 3. Solenoid valve for gas 4. Air/gas ratio control with solenoid valve for gas 5. Adjusting cock

6. Bellows unit 7. Gas burner 8. Combustion air fan9. Orifice plate with differential pressure switch 10. Pressure switch

11. Pressure gauge  with manual cock for pressure gauge

12. Butterfly valve for air  with gear motor

13. Air flow rate control valve

14. Bellows unit 15. Ignition transformer TGI and automatic burner control unit IFS

When the gas pressure control,measuring and safety system(1)is in operation,the burner control system can be placed into operation.

When the automatic burner control unit(15) is enable,the solenoid valves for gas(3 and 4) open,At same time,the ignition transformer(15) is supplied with voltage so that an ignition spark is produced at the burner nozzle in the burner(7).The motorized butterfly valve(12) is in ignition position so that the ignition air flows to the burner(7), A proportional outlet pressure is produced at the air//gas ratio control(4)via the impulse line.If heat is requested,the motorised butterfly valve(12) opens continuously.This causes a higher control pressure to act via the impulse line onto the air/gas ratio control(4)which results in higher gas outlet pressure.The maximum flow rates are limited by the adjusting cock(5)and the air flow rate control valve(13).

Direct heating type combustion system