https://communities.bentley.com/products/building/performance/f/hevacomp-forum/129783/floor-change-sizing-systemI have been following the Mechanical Designer tutorials for Hevacomp. I have drawn my LTHW Heating on the ground floor. Copied this layout to the first floor. Then on the first floor ceiling void pipework, added a floor change connector between the firsten-USTelligent Community 12https://communities.bentley.com/thread/395853?ContentTypeID=1Mon, 19 Dec 2016 07:17:39 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:1b63f677-eb82-48a1-a639-ecb6c9e9d357Shane Regan<p>Hi Liam,</p> <p>It sounds like your Floor Change Connector may not be correctly joining up the two floors in that case. I would&nbsp;recommend deleting the Floor Change Connector and associated risers using the Group Delete function, and then&nbsp;following the method detailed <a href="/products/building/performance/w/building_performance__wiki/5092.how-do-i-add-floor-change-connectors">here</a>.&nbsp;</p><div style="clear:both;"></div>