| 摘要 |
<p>PURPOSE:To permit a coutrol capable of coping with the change of hot-water set temperature or delivery of hot-water promptly by a method wherein the operation of necessary conducting time, which is effected in an operator, is effected repeatedly and continuously during the conduction time of midnight electric power. CONSTITUTION:When the conduction of midnight electric power is started, a midnight electric power detecting circuit 7 detects it and the count of a night time timer (HN) is started in a timer unit 8a. The hot-water set temperature (TS), detected by a temperature regulating volume 5, and a water temperature (TW) are taken into a micro-computer 8 while the necessary conduction time (HS) and the shift time (HP) of conduction starting are operated in the operator 8b. When a condition HN>=HP is established, a signal is outputted from the micro-computer 8 to a heater driving circuit 9 and the conduction of a heater is started. When the condition HN>=HP is not established, the operation is returned to a starting point again to repeat the operations from the decision of midnight electric power conduction and the shift time (HP) of conduction starting may be renewed successively in accordance with the advance of count of the nighttime timer (HN).</p> |
