| 摘要 |
<p>PURPOSE: To effectually achieve loading at night and hereby improve reliability even with any trouble on detection of a solar radiation sensor by providing a controller for forcedly actuating a load when the solar radiation sensor detects high intensity of illuminance and when time measurement by a timer is completed. CONSTITUTION: Water is fed to a heat exchanger in a heat pump unit 2 through a forward piping P3 from a lower part of a hot water storage tank 1, where it is changed to high temperature hot water and returned to the hot water storage tank 1 through a piping P4 whereby hot water is gradually stored in the hot water storage tank 1 from the upper part thereof. In the outdoor heat pump unit 2, a solar radiation sensor 3 being a solar cell detects surrounding illuminance to discriminate daytime and night. The sensor detects the intensity of illuminaont and outputs a signal to a microcomputer 4 being control means of the heat pump unit 2. Heating by the heat pump unit 2 is limited by the output signal in a predetermined set time to actuate the timer in the microcomputer 4.</p> |
