| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner performing a defrosting operation while continuing a heating operation. SOLUTION: The air conditioner is provided with a first by-pass circuit 6 connecting the suction side of a compressor 1 to a part between an indoor heat exchanger 3 and a pressure reducer 4 of a heat pump type refrigerating cycle, the first by-pass circuit 6 comprising a two-way valve 7 and a refrigerant heater 8; and a second by-pass circuit 9 connecting a part between the pressure reducer 4 and an outdoor heat exchanger 5 to a part between the indoor heat exchanger 3 and a four-way valve 2 connected to the refrigerating cycle, the second by-pass circuit 9 comprising a two-way valve 10. When the outdoor heat exchanger 5 is defrosted, the two-way valve 7 of the first by-pass circuit 6 and the two-way valve 10 of the second by-pass circuit 9 are opened to perform the heating and defrosting operations. If sufficient defrosting cannot be performed in this defrosting method, four-way valve switching defrosting is performed in optimum conditions to suppress imperfect defrosting at the outdoor heat exchanger. COPYRIGHT: (C)2007,JPO&INPIT |
