| 摘要 |
PURPOSE:To simply and swiftly control the temperature of bathtub hot water to the set temperature by a method wherein the difference between the temperature of hot water and the set temperature is detected so as to control the temperature of feeding hot water in order to realize the predetermined temperature corresponding to said temperature difference. CONSTITUTION:When the level of hot water in a bathtub 1 is below the water circulation permissible level h1, an electric circuit unit 42 controls the respective openings of a water flow rate control valve 21 and of a hot water flow rate control valve 23 so as to supply proper amounts of cold water and of hot water into a hot and cold water mixer 25 in order to coincide the temperature of service hot water detected by a service hot water sensor 45 with the temperature set at an operating panel unit 41. The resultant mixed service hot water is supplied through a hot water supply pipe 26 into the bathtub 1. When the hot water level in the bathtub 1 arrives at the highest level h2, a highest level sensor 46 detects the arrival, resulting in letting the electric circuit unit 42 to close the order to stop the supply of service hot water. In spite of that, a circulating pump 32 continues its operation so as to keep on circulating the hot water in the bathtub 1. Consequently, the hot water with optimum temperature is obtained much quickly and the satisfactory temperature of the bathwater is obtained without heating or adding water again. |
