| 摘要 |
PURPOSE:To make it possible to maintain the heating device at an excellent efficiency as displayed in the initial period of the use for a long period of time by noticing a case where a heat source is turned off and after a predetermined time, the level of water within a heating pot does not reach the upper limit position. CONSTITUTION:Water within a drain tank 3 communicating with a heat exchanger 2 is introduced into a heating pot 6 through a siphon tube 7 by turning off a heat source 8. An upper limit water level sensor 9 generating a 'water existing' signal, and a slight emission diode 23 is lit and at the same time, the heat source 8 is turned on by a control circuit 13. When generation of steam within the heating pot 6 continues and a 'water non-existing' signal is generated from a lower limit water sensor 10, an IC timer 14 starts timing and the heat source 8 is turned off by the control circuit 13, and water within the drain tank 3 is restored to the heating pot 6. After completion of the timing of the timer 14, in a case where the level of water within the heating pot 6 does not reach the upper limit position, the light emission diode 23 flickers to inform it, and the heat source 8 is turned off by the control circuit 18 until the water supply is carried out. |
