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...