the dtu must be installed in a clean, well-ventilated and dry area that meets the following requirements:

    1 a power source supplied by an unswitched, separate-circuit ac power source providing one of the following ranges:

    1. north america: 104 v ac to 127 v ac (120 v ac -13%/+6%)

    2. europe/england: 198 v ac to 264 v ac (220 v ac-10%, 240 v ac +10%)

    3. eastern europe: 187 v ac to 253 v ac (220 v ac +15%)

    4. japan: 90 v ac to 110 v ac (100 v ac +10%)

    2 humidity: 5% to 95% relative humidity, non-condensing, with a maximum of 32 g of water per cubic metre of air (0.024 lb water per pound of air)

    3 operating temperature: 0° to 40℃ (32° to 104℉)

    4 altitude: within an atmospheric pressure range of 60 m (197 ft) below to 1800 m (5905 ft) above sea level