Ventilating and air conditioning apparatus

A ventilating and air conditioning apparatus comprising a main unit configured to be installed in a ceiling portion of a first indoor space, the main unit configured to be connected with an outdoor exhausting duct for coupling the main unit to outdoors and a second exhausting duct for coupling the main unit to a second indoor space, the main unit comprising:

• a circulating fan disposed in a circulation path for sucking air through a portion of a sucking port open to the first indoor space and blowing air through a blowout port open to the first indoor space;
• a ventilating fan disposed in a ventilation path for sucking air through an exhausting port coupled to the second exhausting duct and through another portion of the sucking port and evacuating the air to outdoors for carrying out ventilation;
• and
• a refrigerant circuit including:
• a compressor for compressing a refrigerant;
• a first heat exchanger disposed in the circulation path for exchanging heat of the air blown into the first indoor space by the circulation fan with the refrigerant;
• an expanding mechanism for expanding the refrigerant;
• and
• a second heat exchanger disposed in the ventilation path for exchanging heat of air from the second indoor space with the refrigerant,
• wherein the refrigerant circuit further includes a flow path switching valve for controlling the refrigerant flow so that the refrigerant flows, during a heating cycle, from the compressor to the first heat exchanger, to the expanding mechanism, to the second heat exchanger, and back to the compressor, and, during a cooling cycle, from the compressor to the second heat exchanger, to the expanding mechanism, to the first heat exchanger and back to the compressor.