| 摘要 |
PROBLEM TO BE SOLVED: To provide an antifreezer with a simple structure, capable of finding a failure of a heater before winter comes. SOLUTION: In the step 1, the temperature of an atmosphere temperature sensor is confirmed and whether the temperature is equivalent to that in autumn or not is determined. If the temperature is equivalent to that in autumn, it is the season for a test of the heater, and the step is moved to the next step 2. In the step 2, the time having elapsed since the previous test is checked. In the step 3, it is confirmed that water is left in a pipe, and in the step 4, it is confirmed that water is still. In the step 5, a first water intake heater, a can heater and a hot water outlet heater are temporarily electrified, and at the same time, the variation of temperature of temperature sensors located adjacent to the heaters is monitored to be compared with data on the temperature rise in the case any one of the heaters is broken. COPYRIGHT: (C)2004,JPO |
