| 摘要 |
PURPOSE:To prevent an abnormal over-heating of equipment caused by a clogged condition of a filter by a method wherein a pulse output is overlapped to an input of sensing an alarm temperature, the alarm state is produced with an output from a voltage comparator, a pulse output is similarly overlapped to an input for sensing an operation stopped temperature and a driving of pump is stopped with an output from the voltage comparator. CONSTITUTION:As dusts and the like are clogged in a filter 6, a temperature of a thermistor 5 is increased, a voltage at a part C is decreased, and further decreased below a pulse voltage at a part B, an output from a voltage comparator 25 becomes a DC output from the pulse output. A microcomputer 16 turns ON a driver 29 at a port 38 to light up a lamp 30 so as to inform an abnormal state. As the clogged state is advanced, a voltage at the part C is decreased below a voltage at a part A, an output from the voltage comparator 26 becomes a DC output from the pulse output, this is inputted to a driver 27 and then a pump 9 is stopped. This DC output is inputted as a stop signal to a port 35 of the microcomputer 16, the microcomputer 16 turns ON a driver 31 at a port 39, light up the lamp 32 and inform that the combustion is stopped. |
