| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve heat efficiency of a hot water circulation system where a temperature of hot water heated by a burner and supplied from a heat exchanger to a hot water terminal is detected, and the burner is operated to keep the detected temperature near a target temperature. <P>SOLUTION: A hot water temperature control means 5 executes "combustion/extinction switching processing" for alternately and repeatedly executing a burner combustion process (STEP 9, STEP 10) for operating the burner 21 until the detection temperature by the temperature detecting means 4b becomes higher than an upper limit temperature with combustion amount decided on the basis of a reference combustion amount when the detection temperature by the temperature detecting means 4b reaches the target temperature by executing "target temperature carry-over processing", and a burner extinction process (STEP 11, STEP 12) for extinguishing the burner 21 when the detection temperature by the temperature detecting means 4b becomes higher than an upper limit temperature, and keeping the burner 21 in an extinguished state until the detection temperature by the temperature detecting means becomes lower than a lower limit temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT |
