I 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 first/ground floor. This added a floor change connector and pipework from the Ceiling void to the First Floor Level. Then on the Ground Floor I connected the pipework into the floor change connector. However when I size my system it only sizes the Ground Floor. I have followed what the tutorial says but It hasn't sized my first floor. Any ideas? Thanks.