Netsys - HWS return no flow

Question

I have completed a F&R HWS system but keep getting a no flow pop up when trying to run the calc with a return, I have also run the system as a flow only to get the required flow sizes which worked ok.

Shane Regan · Answer

Hi Adrian, 
 That version is quite old at this stage so that could be the cause of the error. I would recommend uninstalling all mentions of Hevacomp v26 from your machine and installing the latest version - details on how to do so here .

Shane Regan · Answer

Hi Adrian, 
 You need to be careful if adding in separate return, as you need to ensure that the system remains valid (ie no closed loops/open ended pipes). There is an example of a similar scenario in a Heating system here . 
 However, if you are just changing the existing pipework then I'm still at a bit of a loss as I have fixed all pipework to F&R and it is calculating fine. Please ensure that you select all pipe sections when changing the system type, to avoid the pitfalls mentioned above. I have uploaded the working project for you to this link.