Refrigeration – Automatic control – Refrigeration producer
Patent
1984-05-14
1985-09-10
Tanner, Harry
Refrigeration
Automatic control
Refrigeration producer
62217, F25D 1702
Patent
active
045398208
ABSTRACT:
A protective capacity control system and method for controlling the capacity of a refrigeration system are disclosed. The protective capacity control system receives electrical input signals indicative of operator selected settings and refrigeration system operating parameters. These input signals are processed to generate a control signal which is a step function, preferably having two steps, of the temperature difference between a desired set point temperature and the sensed temperature of a heat transfer fluid cooled by operation of the refrigeration system. The capacity of the refrigeration system is reduced at a first effective overall rate to provide capacity control which will reduce hunting by the capacity control system when the sensed temperature of the heat transfer fluid cooled by operation of the refrigeration system is less than a lower limit of a selected temperature deadband relative to the desired set point temperature. The capacity of the refrigeration system is reduced at a second effective overall rate, greater than the first effective overall rate, when the sensed temperature of the heat transfer fluid cooled by operation of the refrigeration system is less than a second, predetermined temperature limit which is less than the lower limit of the selected temperature deadband relative to the set point temperature to prevent freezing of the heat transfer fluid cooled by operation of the refrigeration system.
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Carrier Corporation
Miller Douglas L.
Tanner Harry
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