| 摘要 |
PROBLEM TO BE SOLVED: To prevent a life from decreasing due to the gas inclusion of a liquid refrigerant conveyance pump by stably securing the amount of circulation of refrigerant for coping with the increased capacity of an indoor machine in an air-conditioner with a secondary side refrigeration cycle using a refrigerant conveyance device. SOLUTION: A refrigerant-carrying device 1b of a secondary side refrigeration cycle 5b is composed of a plurality of amount-of-refrigerant adjustment tanks 3a-3d being connected in parallel, a plurality of liquid refrigerant conveyance pumps 2e-2h that are connected in parallel corresponding to the amount-of- refrigerant adjustment tanks 3a-3d where the pressure-feeding direction of the refrigerant is set to a single direction, and a header 20 that is connected between the liquid refrigerant conveyance pumps 2e-2h and the amount-of-refrigerant adjustment tanks 3a-3d, a four-way valve 21 is connected between the refrigerant conveyance device 1b and indoor machines 7a and 7b, thus securing the amount of circulation of refrigerant corresponding to the increased capacity of the indoor machines and preventing gas inclusion for any operation of the liquid refrigerant conveyance pump corresponding to the operation condition of a plurality of indoor machines in each operation of cooling and heating.
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