New to forum.How do I wire this stat to a vokera maxin 24e boiler. Connections are N,L,1,2,3(1&2 CONNECTED) and N,L,4,5,6 AND 7(6 AND 7 not used).Could somebody help on wiring this up correctly. Does it need to wired volt free or not, any help please as starting from scratch and want to get it right,many thanks!!!!