SHUNKANYUWAKASHIKINIOKERUSUIRYOCHOSETSUKI

摘要

PURPOSE:To shorten rise-up time by a method wherein a flow amount regulating valve is controlled to choke the flow amount of water which flows through a heat exchanger from a time when a water flow sensor has detected a predetermined flow amout of water to a time when a preset flow amount limiting condition is released. CONSTITUTION:When an operating switch SW is put ON, an outlet hot-water temperature signal 12 and a water-flow signal 7 are inputted into a micro-computer 11. The micro-computer 11 operates a predetermined operation by these input signals, outputs a closing direction driving signal S1 and an opening direction driving signal S2 and controls a servomotor 16 to control the opening and closing of the flow amount control valve. In this case, the closing direction driving signal S1 is outputted for a predetermined period of time from the detection of flow amount after the switch SW is put ON and the flow amount regulating valve is driven into the closing direction so as to choke the flow amount. According to this method, the rise-up upon the beginning of the operation of the hot-water heater may be shortened.