Abstract: A system and method of controlling a compressor rack having a plurality of variable capacity components is provided. A variable capacity component is selected from the plurality of variable capacity components as a designated variable capacity component. The designated variable capacity component is operated by varying a capacity of the designated variable capacity component. Each variable capacity component of the plurality of variable capacity components, except for the designated variable capacity component, is operated at a fixed capacity corresponding to one of a maximum and a minimum capacity of the variable capacity component.

Abstract: A compressor control system includes at least one variable compressor, at least one fixed-capacity compressor, and a controller. The controller modulates the variable compressor based on a suction pressure reading of the variable compressor. In addition, the controller selectively toggles the fixed-capacity compressor between a run mode and a shutdown mode based on an operating parameter of the variable compressor.

Abstract: A method comprises grouping a plurality of building system controllers into at least one control system group, the at least one control system group corresponding to at least one connected group of building system controllers. The method also comprises grouping the at least one control system group into at least one site group, the at least one site group corresponding to a physical location of the at least one control system group. The method also comprises selecting a group from the at least one site group and the at least one control system group, and performing an activity on each controller within the selected group.

Abstract: A method of displaying building system controller data includes receiving a user login associated with predefined user access privileges and receiving a building system controller selection, requesting a listing of building system controller applications and activities from a building system controller associated with the building system controller selection, and generating a display of available building system controller applications and allowable activities based on the user access privileges and based on the listing.

Abstract: A controller for a system having at least one variable-capacity, pulse-width modulated compressor and at least one fixed-capacity compressor is provided. The controller may include processing circuitry that modulates the at least one variable-capacity, pulse-width modulated compressor to any capacity substantially between ten percent capacity and one hundred percent capacity. The processing circuitry may determine a desired capacity of the at least one variable capacity, pulse-width modulated compressor based on a load sensor signal and a current run percentage of the at least one variable capacity, pulse-width modulated compressor and may toggle the at least one fixed-capacity compressor between a run mode and a shutdown mode based on the desired capacity of the at least one variable-capacity, pulse-width modulated compressor.

Abstract: A controller and method for control of a refrigeration system having a compressor rack operable at a plurality of capacities may include determining a rate of change in suction pressure for a first capacity, determining a rate of change in suction pressure associated with a second capacity, and determining which of the first capacity and the second capacity will produce the least variation between a measured suction pressure and a desired suction pressure based on the rate of change in suction pressure associated with each.

Abstract: A system and method of controlling components of a refrigeration system includes determining a desired rate of change of a refrigeration system operating parameter, using historical data to predict an expected rate of change of the operating parameter for cycling each component, calculating an appropriateness factor for each component corresponding to a difference between the expected rate of change for the component and the desired rate of change, ranking the components based on the appropriateness factor, and selectively cycling at least one component based on the ranking.

Abstract: A system and method of controlling a compressor rack having a plurality of variable capacity components is provided. A variable capacity component is selected from the plurality of variable capacity components as a designated variable capacity component. The designated variable capacity component is operated by varying a capacity of the designated variable capacity component. Each variable capacity component of the plurality of variable capacity components, except for the designated variable capacity component, is operated at a fixed capacity corresponding to one of a maximum and a minimum capacity of the variable capacity component.

Abstract: A refrigerated case for storing food product includes a sensor module and a control module. The control module receives input from the sensor module and compares the input to a set point to generate an output indicative of a difference between the input and the set point, and further updates the output based on the input from the sensor module. A heater module controls a heater attached to a control surface of the refrigerated case based on the output to maintain a temperature of air adjacent the sensor module above a dew point temperature of room air.

Abstract: An anti-condensation control apparatus for a refrigeration device generally includes a sensor module and a control module. The control module receives an input from the sensor module and compares the input to a set point. The control module generates an output indicative of a difference between the input and the set point and updates the output based on the input from the sensor module. A heater modulator controls a heater based on the output from the control module to maintain a temperature of the outer surface of a refrigerated device such that relative humidity adjacent the sensor module is substantially between 90-95 percent relative humidity, or slightly above dew point.

Abstract: A method includes cycling an electronic evaporator pressure regulator valve fluidly coupled to a refrigeration circuit to regulate flow through the electronic evaporator pressure regulator valve and sensing a current drawn by the electronic evaporator pressure regulator valve during cycling of the electronic evaporator pressure regulator valve. The method further includes determining a valve condition of the electronic evaporator pressure regulator valve based on the sensing.

Abstract: A refrigeration system and method includes a refrigeration component and an electronics module preconfigured with a data set for the refrigeration component. The electronics module stores the data set including identification and configuration parameters of the refrigeration component. A refrigeration system controller that communicates with the electronics module to copy the data set and to regulate operation of the refrigeration component within the refrigeration system.

Abstract: An apparatus for refrigeration system control includes a plurality of circuits, each circuit having at least one refrigeration case and an electronic evaporator pressure regulator in communication with each circuit. Each electronic evaporator pressure regulator controls a temperature of one of the circuits. A sensor in communication with each circuit measures a parameter from the circuit. A controller associated with each electronic evaporator pressure regulator controls the respective electronic evaporator pressure regulator based upon measured parameters from each of the circuits.

Abstract: A probe and method for simulating refrigerated product temperature includes a housing containing a thermal mass having thermo-physical properties similar to refrigerated food product, a temperature sensing element operable to measure the temperature of the thermal mass, and a transceiver in communication with the sensing element and operable to wirelessly transmit data from a refrigeration display case to a remote receiver.

Abstract: A method and apparatus for refrigeration system control includes a control system operable to meet cooling demand and control suction pressure for a plurality of refrigeration circuits each including a variable valve and an expansion valve. The controller controls the variable valve independently of the expansion valves to meet cooling demand by determining a change in a measured parameter and controlling at least one of the variable valves based upon the change to an approximately fully open position.

Abstract: A method for controlling refrigeration including a simulated product temperature sensor operable to measure a simulated product temperature from a refrigeration case and a transceiver in communication with said simulated product temperature sensor and operable to wirelessly transmit data. A receiver receives the wirelessly transmitted data and a controller in communication with the receiver controls the refrigeration system based upon the wirelessly transmitted data from the refrigeration case.

Abstract: A method and apparatus for refrigeration system control includes an evaporator pressure regulator and sensor in communication with one of a plurality of refrigeration circuits. The sensor is operable to measure a parameter of the refrigeration circuit. A controller is operable to adaptively control a suction pressure of the compressor rack based upon the measured parameter, whereby the controller controls a circuit temperature for one of the plurality of circuits. Further, the controller is operable to control the electronic evaporator pressure regulator to control the temperature in the one of a plurality of refrigeration circuits by determining a change in the parameter and updating a set point based upon the change of parameter.

Abstract: A method for refrigeration system control according to the invention includes identifying a lead circuit having a lowest temperature set point from a plurality of circuits, wherein each circuit includes at least one refrigeration case. The suction pressure set point for a compressor rack is initialized based upon the identified lead circuit, and a change in suction pressure set point is determined based on measured parameters from the lead circuit. The suction pressure set point is updated based upon the change in suction pressure set point. A first valve position for a first electronic evaporator pressure regulator associated with a first refrigeration circuit is determined based on the determined change in suction pressure set point, which is based upon the measured parameters from the lead circuit. A second valve position for a second electronic evaporation pressure regulator associated with a second refrigeration circuit is based upon a second measured parameter.

Abstract: A method for refrigeration system control according to the invention includes identifying a lead circuit having a lowest temperature set point from a plurality of circuits, wherein each circuit includes at least one refrigeration case. The suction pressure set point for a compressor rack is initialized based upon the identified lead circuit, and a change in suction pressure set point is determined based on measured parameters from the lead circuit. The suction pressure set point is updated based upon the change in suction pressure set point. A first valve position for a first electronic evaporator pressure regulator associated with a first refrigeration circuit is determined based on the determined change in suction pressure set point, which is based upon the measured parameters from the lead circuit. A second valve position for a second electronic evaporation pressure regulator associated with a second refrigeration circuit is based upon a second measured parameter.

Abstract: A system and method for controlling refrigeration including a simulated product temperature sensor operable to measure a simulated product temperature from a refrigeration case and a transceiver in communication with said simulated product temperature sensor and operable to wirelessly transmit data. A receiver receives the wirelessly transmitted data and a controller in communication with the receiver controls the refrigeration system based upon the wirelessly transmitted data from the refrigeration case.