234.3 Point of InstallationNote the following points when setting up the UPS systemand its external battery units (special accessories):♦ The contact surface must be smooth and in level. It mustalso be sufficiently strong and sturdy to avoid vibrationand shock loads.♦ Make sure the mounting is able to support the weight:This is particularly important in conjunction with externalbattery units (special accessories).♦ Set up the units so that adequate air circulation isassured. There must be at least 100 mm clearance at theback for ventilation purposes. Do not block the intakeopenings on the front and, if present, on the side of theunit. There must be a gap of at least 50 mm here.♦ Set up external battery units (special accessories) on theside of the UPS system. To ensure the greatest possiblemechanical stability, you should not set up the externalbattery unit(s) above or below the UPS system.♦ Avoid extreme temperatures! We recommend an ambienttemperature of 15 °C to 25 °C in order to maximise theservice life of the batteries. Do not expose the units todirect sunlight or operate them close to other heatsources such as radiators.♦ Protect the units against external effects (in particularmoisture and dust). In this regard, please also refer to theinstructions in chapter 4.2, page 22 in these operatinginstructions.If you transport the unit from a cold room into a warm one, orif the room temperature suddenly drops then condensationmay form inside the unit. To avoid any damage due tocondensation, leave the unit to acclimatise for 2 hours beforeyou switch it on.