Size system - closed loop issue

Question

Hi 
 I've finished the emitters placing and pipework arrangement in both floors with floor connector. Isometric view shows a correct layout. 
 After placing the system marker to the start of the network, clicking "size system" comes with a message saying "closed loop found in the system". 
 Can you help? 
 
 Thanks 
 Luis

Duncan Brown · Accepted Answer

Luis - <edit> I can't think what you may have done, other than enter in the wrong numbers when drawing the riser.It will take whatever figures are entered. 
 When you select a pipe it shows you the mid-point of the height, rather than the top or bottom of it - the mid point of 0 to .15 is .075. 
 I would suggest group deleting again, and redrawing. What you could do is group delete again around the floor change connector on floor one and draw one of your horizontal pipes right into the floor change connector. In this case, it should add the riser automatically. Regards,