| 摘要 |
PURPOSE:To prevent unexpected supply of hot water by preventing changeover of a hot water temperature setting circuit to a high temperature setting state when a driving switch is in an OFF state, and automatically changing to a low temperature setting state based on the heating stoppage. CONSTITUTION:A hot water temperature setting changeover mechanism 28 enables excitation of a relay R due to a push-button switch 27, that is, changeover of a hot water temperature setting circuit 20 to a high temperature setting state. At the same time, after the excitation of the relay R, the relay R is excited and retained regardless of OFF of the push-button switch 27. By turning ON of the switch 27, a condenser C is charged. At the time of stopping the burning, a third transistor Tr3 is turned ON by the discharge of the condenser C and a first transistor Tr1 is turned OFF, whereby the relay R is demagnetized and the hot water temperature setting circuit 20 is changed over to a low hot water temperature setting state. |
