I'm replacing my CH boiler with a Worcester Greenstar 24i system boiler but retaining my Horstmann H27XL control unit. The system is fully pumped with 2 Sunvic motorised valves for the DHW and CH with roomstat and cylinder stat. Has anyone used this set up with these components and if so do they have a wiring diagram? I've got an electrician coming in but I'm trying to get the cables in before the plasterboard is installed.