| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of judging the fault of a pump for circulating heat medium, in a parallel type of warm water supplier where a plurality of heat sources are connected in parallel with one another. SOLUTION: A water flow sensor 17 is connected in series to heat sources 7a, 7b,..., and plural units of heat sources 7a, 7b,... are connected in parallel between a supply pipe 4 and a return pipe 5. The circulation path consisting of the supply pipe 4 and the return pipe 5 is provided with a circulation pump 12. After the operation of the circulation pump 12, the heat sources 7a, 7b,... are operated in order one unit by one unit, and the existence of water passage is detected with the water flow sensor 17. In case that the water passage can not be detected even if the heat sources 7a, 7b,... are switched a specified number of times, it is judged that the circulation pump 12 is faulty.
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