Expert electricians only may open this device in due compliance with the wiring diagram shown in the housing cover / on the housing / represented in the corresponding operating instructions. All expert electricians charged with the execution of such works must comply with the relevant safety regulations currently operative and in force. Caution: The operation of the controller in the vicinity of other devices that do not comply with the EMC directives may affect its functions. The company charged with the installation of the device must, after the completion of the installation works, instruct the user of the control system into its functions and in how to operate it correctly. These operating instructions must be kept at a place that can be accessed freely by the operating and/or servicing personnel in charge.