| 摘要 |
PURPOSE:To prevent frequent repetition of ignition and extinction of an oil heater that is possibly caused by short-period fluctuation of the temperature, by employing such an arrangement that the heater is ignited when the temperature of its burning section is lower than a prescribed temperature and after the heater is once ignited, combustion is continued for a certain time period independently of other control signals. CONSTITUTION:In the state that a heater is ignited, a relay contact 80a is kept OFF and the level of the output of a comparator Cp1 is high. Therefore, a transistor Tr1 is in its energized state whereas a transistor Tr2 is in its de-energized state since the level of the non-inverted input of a comparator Cp2 connected to the collector of the transistor Tr1 is low. In this state, a relay Ry4 is not energized and a relay contact 60a is kept ON, so that combustion is continued after ignition. |
