JPS643461A - Hot water feeder - Google Patents

Abstract

PURPOSE:To shorten the time required for a hot water temperature to become stable at a predetermined temperature and prevent a hunting of hot water temperature during a normal discharging of hot water by a method wherein a maximum biasing amount until a mixed hot water temperature rises up to a desired hot water temperature after the hot water is discharged is set to a desired amount which is larger than the maximum biasing amount after increasing up to the desired hot water temperature. CONSTITUTION:Water flowing in a heating passage 3 is heated by a heat exchanger 2, set to a hot water discharged temperature slightly higher than a set temperature T by assuming a cold water mixed part and then it is mixed with cold water. A hot water temperature TM after mixing operation is detected by a hot water temperature detector 8, a biasing amount of a driving means is calculated at an amount of water control part 14 in such a way a relation of TM=TS can be attained and a mixing valve 10 is operated. When hot water is started to be discharged, the biasing amount is made large as compared with that of hot water discharging operation to control the mixing valve 10 under a high speed operation, resulting in that the time required for a mixing hot water temperature to become stable at a set temperature is shortened, response of a control of the amount of gas as the starting of hot water discharging operation is made fast and an overshoot is also decreased. During a discharging of hot water, since the biasing amount is decreased lower than that of hot water discharging operation, so that a hunting is prevented from being generated and so a stable control can be attained.