| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a burden of a backup electric power source for an equipment main body of a hot-water supplying unit or the like, and to make times of plural remote control units easily conformed. SOLUTION: Two remote controllers of a main remote controller 1 and a sub-remote controller 2 are connected electrically to the hot-water supplying unit 3. The sub-remote controller 2 has no backup electric power source, and a time data is read out from the main remote controller 1 in an ON of the power source (STEP2). The sub-remote controller 2 checks a time difference with respect to the main remote controller 1, to be conformed to a time of the main remote controller 1 after waiting for two seconds (STEP13), when the time difference comes to one minute of a threshold value (YES in STEP6). When the time difference exceeds the threshold value, the time is conformed immediately because the time is set by the main remote controller 1 (STEP13). In the main remote controller 1, consistence of the time by the sub-remote controller 2 is waited by stand-by for 5 seconds, even when time difference reaches to the threshold value. The time is immediately conformed when the time difference exceeds the threshold value.</p> |
