| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a water softening system with no risk of unavailability of hot or cold water due to freezing. <P>SOLUTION: The water softening system is provided with: a water softening tank 11 having a tank water inlet port 13 and a tank discharge port 14 and incorporating ion exchange resin; a water inlet port 15 connectable to an external water source; a water outlet port 16; a water flow detection means 19 detecting presence or absence of a water flow; and a discharge port 17 and one or more valves. In the system, an ordinary water feed circuit communicated from the water inlet port 15 with the tank water inlet port 13 according to the open/close state of the valves and extending to the water outlet port 16 from the tank discharge port 14; a bypass water feed circuit extending to the water outlet port 16 from the water inlet port 15 without passing through the water softening tank 11; and a backwashing circuit communicated with the tank discharge port 14 from the water inlet port 15 and extending to the discharge port 17 from the tank water inlet port 13, are switchable. When the open/close state of the valves is set to compose the backwashing circuit and when the water flow detection means 19 does not detect a given water flow rate, the open/close state of the valves is switched from the state of composing the backwashing circuit to the state of composing the bypass water feed circuit. <P>COPYRIGHT: (C)2010,JPO&INPIT |
