• Operate the device only in locations providing the tolerable operating temperature range 0°C~50°C. • For cleaning, make sure the device is plugged off and only use a damp cloth without acid detergent. • Install the device only in dry and dustproof surroundings. Protect the device against any liquid’s penetration. • Avoid the penetration of any artefacts, e.g. through ventilation slots. • Do not open the device yourself. In case of malfunction, contact your local installer or dealer. Unauthoriz