| 摘要 |
<p>PURPOSE:To control the start of operation so that the water temp. of a water tank becomes set temp. at set time and to control a biological treatment purification process to the optimum temp. so as to maximize the purifying capacity for biological treatment purification during a time other than the set time. CONSTITUTION:A part of the bath water in a bathtub 10 is taken out to be purified in an integration type purifying and sterilizing cylinder 20 and the bath water in the bathtub 10 is made possible to heat by a heater 4. The heater 4 is driven and controlled by the command of a control unit 78. When the temp. of bath water is held other than the time of bathing, the heater 4 is controlled so that the temp. of bath water becomes the optimum temp. of biological treatment purification capacity. The heating start time of the heater 4 is determined, for example, by operating the radiation quantity of bath water, heating capacity, the heat capacity of the bathtub 10 and the input of sensors 80, 82 and the heater 4 is driven. By this constitution, bath water is efficiently heated at a stroke and bath water becomes set temp. at bathing set time.</p> |
