| 摘要 |
PURPOSE:To reduce a removal of pilot water at a pump when water in a bath tub is discharged or drained by a method wherein an auxiliary water tank and a check valve are installed in a branch pipe having a smaller diameter than that of the additional boiler circuit branched from the additional boiler circuit. CONSTITUTION:Branch pipes 13, 22 are branched from an outlet point A of a pump 12 for circulating hot water in a bath tub 16 and an inlet point B of the pump 12 connected to an additional boiling circuit 11 and their terminal ends are connected to an auxiliary water tank 14. The branch pipes 13, 22 are comprised of fine tubes having a smaller diameter than that of the additional boiling circuit 11. The branch pipes 13, 22 are provided with check valves 20, 21. Pilot water is fed into the pump 12 by the auxiliary water tank 14 and since the branch pipe has a small diameter, it is possible to reduce an opportunity of flowing-out of the water in the auxiliary water tank 14 and further the tank is opened or closed by the check valves 20, 21 in response to the form of operation, resulting in that the opportunity of the water flowing-out operation in the auxiliary water tank 14 is further reduced. |
