A new method has been devised for manually setting variable motor speeds and valve positions for the purpose of maintenance and calibration. Originally these could be manually overridden using a box on the graphics. The new method provides manual control by just clicking on the “Auto” button on the graphics to bring up a temporary pop-up box as above and change the “Auto” button colour from red to green. The manual control box can be pinned so that it isn’t lost behind other windows. The nature of the pop-up means the graphics are less cluttered and become clearer. This facility has well sized buttons to allow operation from a touch screen.