| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress the transitional large overshoot or undershoot of a hot water temperature. <P>SOLUTION: This water heater D includes a primary-side inlet temperature detecting means s1, at least one of a primary-side outlet temperature detecting means s2 and a secondary-side inlet temperature detecting means s3, a secondary-side outlet temperature detecting means s4, a secondary-side flow rate detecting means r1, a primary-side flow rate calculating means 6 calculating a target circulation flow rate of heat medium water, a hot water circulation pump 4, a rotating speed calculating means 6 calculating a target rotating speed of the hot water circulation pump 4, a control voltage calculating means 6 for a pump control voltage, a pump drive circuit driving the hot water circulation pump 4 based on the pump control voltage, and a first correction control means 6 correcting the target hot water temperature based on the deviation of the target hot water temperature and a heating water temperature at a secondary-side outlet, and the first correction control means 6 multiplies the correction amount of the target hot water temperature by a hot water supply flow rate before change and a hot water supply flow rate after change, when the hot water flow rate from the secondary side is changed. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
