SR981S/SR982S operation manual of solar pump stationPage 29 of 85System 10: 1 tank + T-valve controlled by return heatingDescription:Controller compares the temperature between T1 of collector array and T2 of tank, whentemperature difference reaches its switch-on value (DT1O), then P1 is triggered, tank isheated until tank temperature reaches its maximum value or when temperature difference(DT1F) drops to the switch-off value, then P1 is ceased.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 DescriptionT1 Sensor of collector arrayT2 Sensor on the bottom part of tank P1 Pump 1 for collector arrayT3 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 heatingreturnT7 Sensor on the return pipeT8 Sensor on the flow pipe( SR981S no)List of available auxiliary functions in this system (functions are selectable)Input ports Description Output ports DescriptionT5 Sensor on solid fuel boiler R2 Pump for solid fuel boiler (SeeParagraph 8.5.2)
