| 摘要 |
<p>PURPOSE:To permit to heat up to a set temperature until finishing midnight electric power conduction by a constitution wherein a heater conducting condition curve, memorizing water temperature in a hot-water reserving tank, is compared with the set heat-up temperature and first predetermined water temperature to control ON-OFF of a heater and a heat pump heating machine. CONSTITUTION:When the conduction of midnight electric power is started, an atmospheric temperature is read from an atmospheric temperature sensor 7 and the set temperature T2 is read from a hot-water temperature setting unit 8 while a curve TB is selected from heater conducting condition curves, memorized in a memory unit 9, by the combination of the atmospheric temperature and the set temperature T2. The water temperature TW is lower than the maximum temperature T1 available by the heat pump in a division (a)-(c), therefore, the heat pump heating machine 3 is put ON while the water temperature TW is compared with the curve TB in the division (a)-(c) with a given period and when TW<TB, the heater 2 is kept ON but when TW>=TB, the heater is kept OFF until next comparison. By repeating these operations, water may be heated up under an ideal condition along the curve TB until the heat-up temperature T2.</p> |
