| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pump device capable of freezing hot water/water in a circulation circuit with a simple and low cost configuration, and to provide a hot water system capable of preventing freezing of hot water/water in the circulation circuit with a simple and low cost configuration by including that kind of pump device, without installing a control device capable of executing complicated control by each unit. <P>SOLUTION: In this pump device capable of receiving a control signal transmitted by an external control device 5, and including at least a main circulation pump 24, a temporary circulation pump 25 and a pump-side temperature detecting means 32, the main circulation pump 24 is operated under a condition that the pump-side temperature detecting means 32 detects a prescribed temperature or less. The main circulation pump 24 in operation is forcibly stopped in a case when a control signal for operating the temporary circulation pump 25 is received from the external control device 5, while the temporary circulation pump 25 takes a pause. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
