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AssigneeThermo King Corporation
InventorsRomuald M. Jurewicz, Albert C. K. Wong, Verlon J. Wirth
Estimating the term…
Methods and apparatus for converting a refrigeration unit having a manually controlled thermostat to remote operation via a data logger, without replacing the manually controlled thermostat. A set point temperature selector associated with the thermostat is fixed at a predetermined value, and a resistance temperature detector (RTD), which is normally connected to a temperature input of the thermostat, is disconnected. A set point temperature for a space conditioned by the refrigeration unit is selected via the data logger. The data logger monitors the temperature of the conditioned space, compares the temperature of the conditioned space with the set point temperature selected via the data logger, and determines an operating mode for the refrigeration unit which will cause the temperature of the conditioned space to be maintained in a predetermined range relative to the set point temperature selected via the data logger. A potentiometer is connected between the data logger and the temperature input of the thermostat. The data logger adjusts the resistance of the potentiometer to correspond to a temperature of the RTD, which, relative to the predetermined set point temperature fixed on the set point temperature selector associated with the thermostat, will cause the thermostat to implement the operating mode determined by the data logger.
A method of converting a refrigeration unit to remote control using a data logger which is remotely operable, with the refrigeration unit having a thermostat having a temperature input connected to a temperature sensor responsive to the temperature of a space conditioned by the refrigeration unit, and set point selector means for selecting a set point temperature for the conditioned space, comprising the steps of:
In a refrigeration unit which controls the temperature of a conditioned space, including a thermostat having a temperature input, set point temperature selector means for the thermostat, data logger means having a temperature input, temperature sensor means disposed to monitor the temperature of the conditioned space, and means connecting the temperature sensor means to the temperature input of the data logger means, the improvement comprising:
Dependencies are inferred from the claim text.