| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hot water supply apparatus utilizing solar heat in which such an operation as causing hot water temperature drop in a hot water storage tank can be avoided when a temperature sensor is abnormal. SOLUTION: A circulation pump is provided in a circulation passage connecting between a solar collector and a heat exchanger in a hot water storage tank. Based on the temperatures detected by a collector side temperature sensor for detecting the temperature of heating medium in the solar collector and by a hot water storage tank side temperature sensor for detecting the temperature of hot water in the hot water storage tank, a controller controls the circulation pump. As a basic control, the circulation pump is driven when the detection temperature TH of the collector side temperature sensor is higher, by a reference value, than the detection temperature TL of the hot water storage tank side temperature sensor (step 307), otherwise the circulation pump is stopped (step 302). When a decision is made that the detection temperature of these temperature sensors is abnormal (step 301 and 303), the circulation pump is stopped (step 302).</p> |
