| 摘要 |
PURPOSE:To prevent a sound of flowing water, vibration, etc., generated by an increase of a flow speed of hot water from giving an unpleasant feeling, and to supply the hot water at the same flow rate substantially to any loading member irrespective of a distance from a hot water producing part when an overload occurs. CONSTITUTION:This system is equipped with a hot water producing part equipped with a heat exchanger 11 having a heater 10, and with a loading part 2 having a loading flow passage 4 which is connected to a hot water producing flow passage of the hot water producing part by a forward flow passage and a return flow passage, and a thermometer and a pressure gage are provided on the forward flow passage. The heater, a flow rate control member 9 provided on the return flow passage and a continuous service pump 7 and a backup pump 8 are operated by a circulating operation part, which operates the backup pump according to a signal from the flow rate control member. A pressure raising unit 45 is disposed in between the flow rate control member and the two pumps, and a pressure raising operation part 49 compares values of temperature and pressure from the thermometer and the pressure gage with set numerical values and operates the pressure raising unit so as to increase discharge pressures by the two pumps, when those values are below the set numerical values. |
