Patent ID: 8015836

Claim:
A heat pump system comprising: a heat source unit including a first compressor, a flow passage switch valve, and a heat source heat exchanger; a first load unit including a first flow controller, a first load heat exchanger, a second compressor, a second load heat exchanger, and a second flow controller; a second load unit having a third flow controller and a third load heat exchanger connected in series; and a relay unit for selectively connecting one of an outlet and an inlet of a refrigerant of the first load heat exchanger in the first load unit to any one of an outlet and an inlet of the refrigerant of the heat source unit, connecting the other of the outlet and the inlet of the first load heat exchanger in the first load unit to the other of the outlet and the inlet of the heat source unit via the first flow controller in the first load unit, selectively connecting one of an outlet and an inlet of the refrigerant of the third load heat exchanger in the second load unit to any one of the outlet and the inlet of the heat source unit, and connecting the other of the outlet and the inlet of the third load heat exchanger in the second load unit to the other of the outlet and the inlet of the heat source unit via the third flow controller in the second load unit, wherein: the first flow controller and the first load heat exchanger in the first load unit are arranged in parallel with the third flow controller and the third load heat exchanger in the second load unit; a main circuit is formed by sequentially connecting the first compressor, the flow passage switch valve, the heat source heat exchanger, the flow controllers and the load heat exchangers in the first load unit and the second load unit, which are arranged in parallel, with a refrigerant pipe line; and a load refrigerant circuit is formed by sequentially connecting the second compressor, the second load heat exchanger, the second flow controller, and the first load heat exchanger in the first load unit, with a load refrigerant pipe line.