| 摘要 |
PURPOSE:To increase operational safety in the titled digital type combustion control device, by arranging a prepurge terminating signal is synchronized with a lock pulse which is transmitted to a trial shift register and an adjustable circuit for energizing a final stage clock input of shift register for a prepurge. CONSTITUTION:A combustion control device comprises a transducer 1 generating a ON/OFF pulse in response to a heat demand signal ''H'' at a terminal TS, a transducer 2 generating an ON/OFF pulse in response to a signal ''H'' emitted upon an igition of pilot burner being detected at a terminal FD, a shift register PSR for a prepurge adapted to be energized by an output produced from a memory M1 upon it being energized and set for measuring a preset prepurging duration, and a trial shift register TSR adapted to be energized upon its receipt of a signal indicating termination of purging operation for measuring a preset igintion trial duration. Further provided is an adjustable circuit MP wherein an output Q of FF5 inside the prepurge shift register PSR is received and a timing is adjusted as required to cause a trial shift register TSR a dependent movement. |
