Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Patent
1984-01-16
1984-11-06
Wayner, William E.
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
622884, 165 22, F25B 700, F24F 300
Patent
active
044804423
ABSTRACT:
An air conditioning system comprising an outdoor unit in which a compressor is driven by the power supplied from a variable-frequency power supply and a plurality of indoor units operatively connected to the outdoor unit. Each indoor unit has a circuit for generating a frequency signal to be applied to the variable frequency power supply of the outdoor unit in response to a set room temperature and a temperature detected. In response to the frequency signals transmitted from the indoor units, the control unit of the outdoor unit detects a maximum frequency, a minimum frequency and the number of operating indoor units and determines the operating frequency of the variable frequency power supply in response to the maximum and minimum frequencies and the number of operating indoor units. The control unit includes a decision circuit which responds to the frequency signals transmitted from the indoor units so as to detect a maximum frequency, a minimum frequency and the number of operating indoor units, a circuit which responds to thus obtained maximum frequency and the number of operating indoor units so as to determine an operating frequency which is to be corrected, a circuit for obtaining a correction value, which is used to correct the operating frequency, in response to the difference between the maximum and minimum frequencies and a circuit for determining an operating frequency to be applied to the variable-frequency power supply by subtracting the correction value from the operating frequency to be corrected.
REFERENCES:
patent: 4187543 (1980-02-01), Healey et al.
patent: 4368621 (1983-01-01), Yamaguma et al.
patent: 4407139 (1983-10-01), Ide et al.
Ide Yuichi
Mino Yoshihito
Tsuchiya Yasutoshi
Tokyo Shibaura Denki Kabushiki Kaisha
Wayner William E.
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