| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump type hot water heating device in which a water refrigerant heat exchanger can be used without being damaged by freezing. <P>SOLUTION: The device includes: a heat source machine for heating a refrigerant; a heat exchanger for exchanging heat between the heated refrigerant and a circulating liquid; a pump for circulating the circulating liquid; and a flow switch 13 for detecting a circulation flow rate. The flow switch 13 includes a magnet 51 for generating magnetic force, a paddle 50 for sliding the magnet 51 by flow of the circulating liquid, and a lead switch 56 for outputting an ON/OFF contact signal by detecting the magnetic force. The paddle 50 is provided with a plurality of weights which can vary the flow rate for outputting the ON/OFF contact signal by the amount of the circulating flow rate, and by adding the plurality of weights, the ON-point flow rate can be freely changed, and freezing damage of the water heat exchanger 2 caused by deterioration in the flow rate can be prevented. <P>COPYRIGHT: (C)2013,JPO&INPIT |
