| 摘要 |
PURPOSE:To permit to prevent combustion in a place in which no body is present or the combustion due to malfunctions and improve the safety property of the device by a method wherein the combustion is re-started by no means except the direct operation of man in case the operation of the warm-air room heater is stopped by utilizing a communication circuit from a remote place. CONSTITUTION:When a signal 7 for stopping the operation of warm-air room heater is sent into a micro-computer 1 by a telephone 5 from a remote place through the communication circuit, the micro-computer 1 makes an output signal 9 low, put a transistor 10 OFF and intercepts the coil current of a relay 11. According to this operation, the contact of the relay 11 is opened, the coil current of the relay 2 is also intercepted and the contact thereof is opened. Accordingly, voltage is not impressed on a ventilating motor 4 and a solenoid 4 for limiting fuel, the combustion is stopped and the operation of the warm-air room heater is stopped. When the relay 11 is opened once, it becomes impossible to flow the coil current regardless of the condition of output signal 9 of the micro-computer 1 and re-starting of the operation of the room heater in case of non-presence of man becomes impossible. |
