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• W hen working on the solar heating system, isolate the mains power and protect against unintentional reconnection. Return At the end of their useful life these collectors can be Commissioning and operation returned to Wolf GmbH. These collectors must be clearly identified (e.g. as “scrap”) and be delivered expenses paid • T he system must be commissioned by the system during business hours. installer or a qualified person authorised by the All collector materials are either correctly recycled or installer.