| 摘要 |
<p>PURPOSE:To reduce opening and closing frequency of electrical component parts such as relay or the like which control the conduction of exothermal body and improve reliability of electrical parts by a method wherein settings of hot-water temperature setting means are constituted so as to be different in high and low points. CONSTITUTION:In case the hot-water temperature setting is 85 deg.C (high), temperature width between stopping and starting of the conduction of a heater is widened into 15deg. Accordingly, a time period between stopping of conduction of the heater at 85 deg.C and starting of conduction of the heater at 70 deg.C is longer than conventional heaters, therefore, the opening and closing frequency of electrical parts such as the relay or the like which control the conduction of the heater may be reduced and the reliability of electrical parts may be improved. On the other hand, in case the hot-water temperature setting is 55 deg.C (low), the temperature width between stopping and starting of conduction of the heater is narrowed to 5deg., different from 85 deg.C (high) setting. Accordingly, the temperature of starting of conduction of the heater is 50 deg.C, which is high enough, and a temperature suitable for using may be kept.</p> |
