i have a question: Y PLAN FULLY PUMPED system with 3-port mid position valve is wired up in a standard way i believe? BUT on diagrams the terminal box strips are numbered from 1-8! Does it matter what boxes are used, for eg on my diagram the orange wire from the mid position valve is connected in with the number 1 (demand) from the cylinder stat and live from both the pump and boiler! on my diagram it has these all connected to number 8 of the terminal strip. can these be installed as say number 5 of the terminal strip as long as they are ALL connected together?!! as on MY system they don't seem to be in number 8 but the system works fine. What I;m trying to work out is as long as all the wires link up together as per the diagram does it matter if they are in number order, eg 1-8??!