Analog operating elements• Buttons for selecting the required operating mode and for d.h.w. ON / OFF• Setting knob for the room temperature setpoint in continuous operation• Button for manual operationThe entry or readjustment of all the other setting parameters, activation of optional functions, and reading of actual values and statuses is made using the operating line principle. An operating line with an associated number is assigned to each parameter, each actual value and each function that can be selected. One pair of buttons is used to select an operating line and one pair to readjust the display.These buttons are located behind a hinged cover. The operating instructions are insert-ed at the rear of the cover.