1) Total head shows the value subtracted by the pressure loss of such like check valve from pump head. 2) Starting head is the value in case inflow suction (0m). In case using for suction lift up (suction total head -4m), set starting head at -0.039MPa. 3) Starting head is set at the value listed in standard specification. 4) When changing the starting head, always set within selectable range of starting head. i.e.. In case that inflow pressure exists, add inflow pressure.