AIR HEAT SOURCE HEAT PUMP HEATING DEVICE AND CONTROL METHOD

摘要

To provide an air heat source heat pump heating device that comprises a refrigerant circuit using a portion of a condenser as a heat exchanger for preventing freezing of an evaporator, and whose heating performance is not decreased even in an environment with high outside air temperature.SOLUTION: An air heat source heat pump heating device comprises a compressor for compressing a refrigerant, a first condenser for condensing the refrigerant compressed by the compressor, a second condenser provided downstream of the first condenser, an expansion valve provided downstream of the second condenser, an evaporator for vaporizing the refrigerant depressurized by the expansion valve, a bypass flow passage for bypassing a flow of the refrigerant passing through the second condenser, and a switching valve provided in the bypass flow passage.SELECTED DRAWING: Figure 1