| 摘要 |
PROBLEM TO BE SOLVED: To efficiently ensure a coolant and oil necessary for dehumidifying heating operation by providing a structure in such a manner that the coolant and oil carried into an external condenser is removable, and, in starting the dehumidifying heating operation, executing a coolant (and oil) recovering control after cooling operation is performed for a prescribed time. SOLUTION: In front seat and rear seat air conditioning systems 2, 3 comprising evaporators 14, 15 and heater cores 18, 19 provided within air conditioning ducts 4, 5, respectively, a passage part 60 allowing the discharge side of a compressor 50 to communicate with the discharge side of an expansion valve XV1 through an external condenser 49 and a liquid tank 52 is provided. A passage part 62 allowing the discharge side of the compressor 50 to communicate with the discharge side of an orifice 53 as expanding means through a sub-condenser 16 is also provided. A coolant recovering passage 66 is provided between the downstream side of the external condenser 49 and the intake side of the compressor 50, and when air conditioning operation is started, the air conditioning operation is performed for a prescribed time, and a solenoid valve V3 is then opened to recover the coolant.
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