| 摘要 |
<p>PURPOSE:To optimally control the completion of heating of an electric water heater to suit the usage pattern with ease of handling by desirably setting any time zone of main power supply by means of a power supply time zone setting means, and displacing the net power supply time zone to the second half of the main power supply time zone. CONSTITUTION:Upon turning on the power switch, the current time is set, and the main power supply starting time is then set, which is followed by setting the power supply stop time. When the main power supply starting time comes, the hot water consumption volume V is read and the heating completion temperature T computed, and then, the power source circuit is closed to start the power supply to a heat generator 2. The hot water temperature Tw in the hot water reservoir tank 1 is then measured by a temperature measuring means 3, and the measured value Tw is compared with the computation result T of the heating completion temperature. If Tw has reached T, the power source circuit is turned off, and the control is terminated. As clear from this description, the main power supply time zone for the heat generator can desirably set by a power supply time zone setting means, and the net power supply time zone can be displaced to the second half of the main power supply time zone by the computing means.</p> |
