An apparatus is described for controlling a plurality k of visual indicating elements of at least one electronic device, where k2, wherein each of the indicating elements is configured to emit light for visual indication of an operating status of the at least one electronic device and/or individual components of the at least one electronic device. The apparatus comprises at least one evaluation and control unit connected to the indicating elements to control intensities of light emitted from the indicating elements to cause the indicating elements emit light having defined intensities during a normal operating mode and, during an operating action of the at least one electronic device, to visually accentuate one or more of the indicating elements that are assigned to the operating action by changing relative intensities of the light emitted from the indicating elements.

An apparatus is described for controlling a plurality k of visual indicating elements of at least one electronic device, where k2, wherein each of the indicating elements is configured to emit light for visual indication of an operating status of the at least one electronic device and/or individual components of the at least one electronic device. The apparatus comprises at least one evaluation and control unit connected to the indicating elements to control intensities of light emitted from the indicating elements to cause the indicating elements emit light having defined intensities during a normal operating mode and, during an operating action of the at least one electronic device, to visually accentuate one or more of the indicating elements that are assigned to the operating action by changing relative intensities of the light emitted from the indicating elements.

A controller for a chiller and a method for controlling a chiller are provided. The method may include receiving, by a controller, a target value of a control factor of the chiller; comparing, by the controller, the received target value with a current value of the control factor of the chiller; transmitting, by the controller, a control factor value change command to the chiller if the received target value is not equal to the current value of the control factor of the chiller; receiving, by the controller, a changed current value of the control factor from the chiller; updating, by the controller, the current value of the control factor on a management screen with the received changed current value of the control factor; and comparing, by the controller, the received target value with the current value of the control factor again.