AIR-CONDITIONING DEVICE

摘要

During a heating operation a control device implements a medium-pressure control, whereby the degree of opening of a second throttle device is controlled on the basis of the deviation between a medium-pressure target value and the detection result from a medium-pressure detection device or a predicted value, and during both the heating operation and a cooling operation the control device controls the degree of opening of a third throttle device on the basis of a target value for the discharge refrigerant temperature of a compressor or a target value related to the discharge refrigerant temperature and on the basis of the detection result from a discharge refrigerant temperature detection device or a value related to the discharge refrigerant temperature and calculated using said detection result. Thus, the flow volume of a refrigerant supplied to the intake side of the compressor via an injection conduit is adjusted.