WATER TANK DEVICE, WATER TANK SYSTEM, AND FAILURE DIAGNOSIS METHOD FOR WATER TANK DEVICE

摘要

PROBLEM TO BE SOLVED: To carry out failure diagnosis in a short time by opening a testing valve to change a water level in a water storage tank independently of the control condition of a fixed water level valve means when a water level sensor detects a water reduced condition as an abnormal condition, and determining whether a failure has occurred or not in at least the water level sensor.;SOLUTION: When the water level sensor 2 measures a water level in the water storage tank 1 and informs of a reduced water warning, the water tank device opens the testing valve 5 to start water supply from a second sub water flow path 32 to the water storage tank 1. Water pressure in a main valve 41 is lower than set pressure and so a passage between a water pipe 5 and a main water flow path 30 is kept in an opened condition and the water supply is started from the second sub water flow path 32 as well as the main water flow path 30 to the water storage tank 1. At this time, water is supplied more to the water storage tank 1 than water discharged from a water supply pipe 10. Then, the water level sensor 2 stops to inform of the reduced water warning and checks whether it informs of a normal condition or not. When the water level sensor 2 still informs of the reduced water warning in spite of an increase in the water level in the water storage tank 1, a failure of at least the water level sensor 2 is determined. On the contrary, when the water level sensor 2 informs of the normal condition, a failure of another part such as a fixed water level valve 4 (a failure of a ball tap 40 or the main valve 41, e.g.) is determined.;COPYRIGHT: (C)2008,JPO&INPIT