SR981S/SR982S operation manual of solar pump stationPage 45 of 858.2 Access submenuAfter select and confirm main menu,►Press “SET” button to enter the submenu►Press “ ”button, to select a submenu►Press “SET” button to access this submenu►Press “ ”button, to adjust parameter►Press “ESC”button, to exit submenu►Press “ESC” button, to exit main menu8.3 DT Temperature difference for solar circuit pumpDescription:Solar circuit pump P1 is triggered by the temperature difference function, so long as thetemperature difference between collector and storage reaches the switch-on DT, solarcircuit pump is triggered. When the temperature difference drops to the switch-off DT, thensolar pump is ceased.For example: the switch-on DT is 8oC, switch-off DT is 4oC, if the temperature on thebottom part of storage is 20oC, then just when collector temperature rises up to 28oC,pump is triggered, and when collector temperature drops to 24oC, pump is ceased.Note: to avoid mistake the minimum difference between two temperature differences(ΔTon –ΔToff) is set as 2 oC.Setup switch-on temperature differenceUnder standby, following steps descript in paragraph 8.1 to access main menu DTtemperature difference menu.►Press “SET” button, to access settings program of mainmenu DT, “DT 1o 08oC” shows on the screen, “08 oC”flashed, the switch-on temperature difference can be set.►Press “ ” button, to adjust the value ofswitch-on DT O, adjustable range (OFF+2 oC）～20 oC,factory setting is 8 oC►Press “ESC” button to exit this setting, parameter issaved automatically.►Press “ ” button, “DT 1F 04oC” shows on thescreen.
