| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water supplying machine which prevents a hydrothermal exchanger from getting frozen and has excellent reliability.SOLUTION: During frost removal operation, a frost removal circuit through which discharge refrigerant of a compressor is passed through a four-way valve, an outdoor heat exchanger, a decompressor, a by-path passage and a four-way valve and returns to the compressor with a switching valve closed. During such frost removal operation, a circulation pump is operated when temperature detected by the refrigerant temperature sensor mounted on a pipe between the switch valve and a hydrothermal exchanger becomes equal to or smaller than a set value. |
