SR981S/SR982S operation manual of solar pump stationPage 30 of 85Above mentioned auxiliary functions should be activated in menu in advance.System 11: East/west collector array +1 tank + T-valve controlled by returnheatingDescription:Controller compares the temperature between T0,T1 of west/east collector array and T2 oftank, when temperature difference reaches its switch-on value (DT1O), then correspondingpump P1,P2 are triggered, tank is heated until tank temperature reaches its maximumvalue or when temperature difference (DT1F) drops to the switch-off value, then P1,P2 areceased.Another temperature difference between T4 and T6 ( DT2O/DT2F) to control T-valve R1 toheat the heating return by solar.Note: when T4 is not installed, then temperature difference between T3, T6 ( DT2O/DT2F)is used to control T-valve R1When T3, T4 are not installed, then temperature difference between T2, T6 ( DT2O/DT2F)is used to control T-valve R1See detailed in 8.4.8/8.4.9Input ports Description Output ports DescriptionT0 Sensor of west collector array P2 Pump 2 for collector array circuitT1 Sensor of east collector array P1 Pump 1 for collector array circuitT2 Sensor on the bottom part of tankT3 Sensor on the top part of tank H1 Back-up heat resourceT4 Sensor on the middle part of tankT6 Sensor on the heating return pipe R1 T-valve for heat the heating returnT7 Sensor on the return pipeT8 Sensor on the flow pipe( SR981S no)
