| 摘要 |
PURPOSE:To eliminate a turning-on or turning-off operation of a switch for each change of an operation mode by a method wherein during a turned-on condition of a heating operation, a hot heating operation is performed irrespective of the turned-on or turned-off condition of a low temperature operating switch and only during the turned-off condition of the heating operation switch and the turned-on condition of the low heating operation, the low temperature operation is performed. CONSTITUTION:When a heating operation switch 16 is turned-on while an operating switch 9 of a hot water accumulation can 1 is turned-on, a microprocessor 17 may judge it as a hot temperature operation irrespective of the turned-on or turned-off condition of the low temperature operation switch 15, a hot temperature operating instruction is issued to a hot temperature and low temperature operation changing-over operation circuit 25, and the turned-on or turned-off condition of the combustion in a burner 2 is controlled in its hot temperature operation mode through a hot water accumulation can temperature control circuit 24 and a combustion control circuit 23. When both the heating operation switch 16 and the low temperature operation switch 15 are turned-on and the heating operation switch 16 is turned-off, the operation is shifted automatically to a low temperature operation. An electric mixing valve 3 is locked to stop a hot water feeding operation. With this arrangement, it is possible to eliminate a troublesome operation of performing a switching operation every time an operation mode is changed-over, is attained. |
