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 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: 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: 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: The invention disclosed herein is a temperature dependent duty cycler control system which provides a duty cycle off time locus responsive to a sensed temperature and is characterized by two selectable off time periods which are connected by slope controllable ramping functions. The system also includes means for coordinating operation of several heating and/or cooling units by making real time determinations of the most efficient average number of units which should be running at a given time and by maintaining a priority order of rotation of the units available to be shed.

Abstract: A load management control apparatus with an improved duty cycle operation has a programmed means to control the off time for a selected interval of time for several loads. The total percentage of off time of the loads being controlled is summed and the total integer is used by a sequential operational means to maintain that number of load off at all times even if loads which are off on demand limit control are included to make the number.