Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1990-06-05
1991-12-24
Wayner, William E.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
622284, F25D 2106, F25B 100
Patent
active
050741209
ABSTRACT:
An outdoor unit includes at least a variable-capacity compressor and an outdoor heat exchanger coupled thereto. Each of a plurality of indoor units includes at least an indoor heat exchanger and a section for outputting required capacity data. A distribution unit parallel-couples the plurality of indoor units to the outdoor unit so as to constitute a plurality of refrigeration cycles for at least heating operations. The distribution unit includes a plurality of refrigerant flow control valves for the respective refrigeration cycles. A first control section provides flow rate control commands to the refrigerant flow rate control valves, in accordance with the required capacity data, and controls an operating frequency to change a capacity of the variable-capacity compressor in accordance with sum data of the required capacity data. A second control section performs a frequency increasing control to increase the operating frequency of the variable-capacity compressor to a predetermined value higher than a value corresponding to the required capacity data when the heating operation is started. A third control section cancels the frequency increasing control of the second control section at a predetermined period of time elapse after the second control section causes the refrigeration cycles to start heating operations.
REFERENCES:
patent: 4622827 (1986-11-01), Jabami et al.
patent: 4720982 (1988-01-01), Shimizu et al.
Kabushiki Kaisha Toshiba
Wayner William E.
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