If you have an old Nilan ventilation unit with a CTS602 control system, you can replace the old control panel with a more modern HMI touch panel.
The HMI touch panel has a larger screen that displays useful information and gives you access to the most essential user settings directly from the main screen. The structure of the menu and its informative text material make it easy to navigate.
The upgrade to HMI touch panel includes installation of the latest software version. You should therefore get an installer to install the upgrade kit, and not attempt to do so yourself.