Oil or gas burner circuit with emergency trip - generates long and short safety delays for restart and flame failure

摘要

The oil or gas burner circuit ensures disconnection when disturbances occur in the burner system. The circuit used in single or multistage firing plants and has two different switching times dependent on the instantaneous operating state. The circuit is switched over to operate at certain times and flame failure causes restart. A releasing lever (10) of the emergency tripping switch (9) has preloaded switching contacts (11, 12) resting on the edge of the releasing lever (10). This is actuated by a long delay drive, with the short delay generated by the flame relay coupled with the releasing lever.