| 摘要 |
PURPOSE:To improve the overall energy efficiency by operating a low-temperature side heat pump hot water supply apparatus at a high performance by providing a control means that controls the ON and OFF of a high-temperature side heat pump hot water supply apparatus as well as the low-temperature side heat pump hot water supply unit. CONSTITUTION:When, upon turning ON the power source, the operation schedule of a high-temperature side heat pump hot water supply apparatus 2 and a low- temperature side heat pump hot water supply apparatus 10 is OFF in the step S2, the high-temperature side heat pump hot water supply apparatus 2 and low-temperature side heat pump hot water supply apparatus 10 are turned OFF in the step 4. If they are ON, they proceed to the step S3, where if the hot water temperature in the hot water tank is higher than the predetermined set temperature, the high-temperature side heat pump hot water supply unit 2 and low-temperature side heat pump hot water supply unit 10 are turned OFF in the step S5. When the hot water temperature in the hot water tank is lower, the high-temperature side heat pump hot water supply apparatus 2 and low-temperature side heat pump hot water supply apparatus 10 are turned ON in the step S6. In this manner, a highly energy efficient operation is made possible. |
