| 摘要 |
<p>PURPOSE:To deliver hot-water from a tap quickly upon reusing the title water heater even when the water heater is not used for a long period of time, by a method wherein, a control means, which continues the conduction of a corrosion prevention circuit for a given time when it is decided that the conduction of midnight electric power source exists and stops the conduction of the same when it is decided that the conduction of the midnight electric power source is not exist, is provided in the title water heater. CONSTITUTION:When midnight electric power conduction starting time has come, the timer switch 5 of midnight electric power contract as well as a second relay 18 are operated and a first relay 16 is operated since the contract of a timer relay 17 is normally closed. Subsequently, the contact 16a is closed, therefore, the conduction of the corrosion prevention circuit is continued until the midnight electric power band is elapsed and next midnight electric power conduction starting time comes after elapsing 24hr. Above-mentioned operation is repeated as far as a leak breaker 6 is not put OFF. On the contrary, when the leak breaker 6 is turned OFF, the second relay 18 is not operated and, accordingly, the first relay 16 is not operated, too, therefore, the conduction of the corrosion prevention circuit is stopped.</p> |
