| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a solar water heat system which does not determine the shortage of an amount of a heating medium simply based on decline in a liquid level but accurately determines whether the heating medium is truly short in amount, and thus, can securely avoid the generation of false information and erroneous treatment caused by the false information. <P>SOLUTION: When a low liquid level electrode is brought into an off-output state (YES in S1), it is determined whether a boiling condition is satisfied (S3). When the boiling condition is satisfied and an on-output state of the low liquid level electrode is continued during measurement by a second timer (S5, YES in S6), it is determined that the shortage of the amount of the heating medium does not actually occur and a drought counter is reset so as not to output error information (S7). Even if the boiling condition is satisfied and if the on-output state of the low liquid level electrode is not continued, the error information is issued (NO in S5, S9). While the boiling condition is not satisfied yet, when a time by a first timer comes, the error information is issued (YES in S10, S9). <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
