Wiring Worcester 24i System boiler.

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9 Feb 2011
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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.
 
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The boiler will require a permanent live along with N & E.

Then a switch live which will be supplied via the 10 way junction box that should already be wired up from previous boiler
 
And don't forget the boiler supplies power to the pump.
And on the plumbing side, you'll need a by-pass.
 
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That's why I like Baxi solo's, they only need a SWL and N E, no need for a permanent L, handy when the boiler is remote from the junction box.
 

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