| 摘要 |
PURPOSE:To prevent crude gas from flowing out when a combustion apparatus is not used, by providing a switch in a controlling circuit including a microcomputer, and by opening and closing a solenoid valve which is actuated by the controlling circuit and which is controlled by a calorific value changing switch as well. CONSTITUTION:When a starter switch 7 is turned ON, an operation lamp 6 lightens. When an ignition and extinguishing button 1 is depressed, a signal by the button 1 is fed into a microcomputer 15, a relay 16 is closed to control a motor cock 9 in an open position, and a solenoid valve 8 is opened to start combustion. When a calorific value changing switch 2 or 3 is closed, the angle of rotation of a motor cock 9 is controlled to be changed by the microcomputer 15 and the calorific value is changed as well as the change is indicated by a calorific value indication lamp 4. When the ignition and extinguishing button 1 is depressed again at the end of operation, the solenoid valve 8 is closed to stop combustion. The starter switch 7 should be kept unless the combustion apparatus is used again within a short time. By cutting OFF of the switch 7, the solenoid valve 8 is not energized even if an erroneous action is caused by the microcomputer 15 because a noise is fed into a signal line and a solenoid valve driving transistor 18 is turned ON when a trouble occurs in an electronic circuit. As a result, crude gas is prevented from leaking out. |
