WRO 300 H16 Introduction HCEN12104 Rev 09.2010The Low rejection rate notification default setting of 90 % isrelevant for most inlet water supplies. It may, however, need tobe adjusted at installation to a lower value by a qualified techni-cian to fit local conditions, especially in cases of low feed waterconductivity (<100 μS/cm). The limit should be set at least 5 %lower than the initial value recorded at installation.The Low rejection rate notification will be displayed when theWRO 300 H enters Standby if the set limit has been exceededfor more than 5 consecutive minutes during the previous runperiod.1.2.3 Mains power switchThe mains power switch is only used in service situations to turnoff the power. The mains power switch is located on the rearside behind a detachable cover.Mains power switch