| 摘要 |
The purpose of the present invention is to provide a highly reliable heat pump water heater capable of detecting an abnormality of a liquid flow path by eliminating conditional factors of the liquid flow path that are different depending on the installation position. This heat pump water heater comprises: a variable capacity compressor (4); a liquid-refrigerant heat exchanger (5) for heating liquid to be heated with a high-temperature, high-pressure refrigerant discharged from the compressor; a liquid temperature detector (15) for detecting the temperature of the liquid to be heated that has been heat exchanged by the liquid-refrigerant heat exchanger; and a controller for controlling the capacity of the compressor. The heat pump water heater includes a liquid flow path through which the liquid to be heated flows from the liquid-refrigerant heat exchanger after being introduced into and then passed through the liquid-refrigerant heat exchanger. The controller controls the capacity of the compressor such that the temperature of the liquid to be heated that has been heat exchanged by the liquid-refrigerant heat exchanger becomes a target liquid temperature. The controller determines that the liquid flow path has an abnormality in the case where the temperature of the liquid to be heated that has been heat exchanged by the liquid-refrigerant heat exchanger is higher than the target liquid temperature when the compressor is operating at a capacity equal to or less than a preset standard capacity. |
