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AssigneeHitachi-Johnson Controls Air Conditioning, Inc.
InventorsKazuhiko Tani, Koji Naito, Tatsuya Mochida, Kazumoto Urata, Yoshiyuki Akiyama, Masami Inaba
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A hot gas bypass circuit that connects a discharge side of the compressor and a portion between the heat source side heat exchanger and the expansion valve, an on-off valve that opens and closes a channel of the hot gas bypass circuit, and a control device performing control to select one of hot gas bypass defrosting and reverse cycle defrosting according to a frosting amount on the heat source side heat exchanger and perform defrosting. The control device controls to open the on-off valve of the hot gas bypass circuit such that a part of a refrigerant discharged from the compressor is supplied to the heat source side heat exchanger via the hot gas bypass circuit and, the control device switches switch the four-way valve such that the refrigerant discharged from the compressor is supplied to the heat source side heat exchanger after passing through the four-way valve.
An air conditioner in which a compressor, a four-way valve, a use side heat exchanger, an expansion valve, and a heat source side heat exchanger are connected to configure a freezing cycle, the air conditioner comprising:
An air conditioner in which a compressor, a four-way valve, a use side heat exchanger, an expansion valve, and a heat source side heat exchanger are connected to configure a freezing cycle, the air conditioner comprising:
Dependencies are inferred from the claim text.