Hi julle, I recommend you start from Examples of Visilogic. Shortest way to open Examples is to go to "Help->Examples...) menu option. Then go to "Version 900->Project examples" directory. "V280_ON_off_control_with_hysteresis_and_high_and_low_alarms.vlp" project was written for heating control with hysteresis. This project will be adopted to control Pump. "V120_Variable_enter_control.vlp" project is a simple example fo Variable entry control. I hope this answers your questions.