CH wiring

[Peter B]

Before I commit myself to anything, any comments (good, bad or otherwise) would be appreciated on the following proposed circuit;

the minute, the boiler is connected to the SFCU and that's it, so everything else will be new.

- The FCU supplies L,N&E to the boiler and N&E to the wiring centre - The boiler supplies L to the wiring centre - The boiler takes S/L from the wiring centre

If the boiler is not switched on, the wiring centre and all associated controls get no power. If the FCU is not switched on, nothing does.

Should I also be taking N from the boiler to the wiring centre, though, rather than going direct?

[Dave Osborne]

IMHO, you should remove and discard the existing flex from the SFCU to the boiler.

You should be taking a new 3-core flex (L,N,E) from the SFCU to the wiring centre and a new four core flex (L,SL,N,E) from the wiring centre to the boiler.

Apart from that, your wiring diagram seems to be consistent with the Sundial general schema.

The only thing slightly confusing thing is that you've shown the Heatmiser receiver with NO/NC contacts, but the contacts are in the energised position and they should be shown in the un-energised position.

HTH

[Peter B]

Ah, right - makes more sense.

I guess I was thrown off track by the diagrams in the wiki all showing the boiler only getting live from connector 10 in the wiring centre.

Based upon your fine work, thanks - then butchered by me in Visio, so I can attach a copy to the back of the cupboard door wherein all the controls will live.

I could try bluffing it and tell you that in the diagram the stats are calling for heat ;)

[ARWadsworth]

I would normally use T&E from the fused spur to the wiring centre. I only use flex for connections to the boiler, pump etc

The diagrams are only a guide. But as you spotted the boiler quite often needs a permanent live as well as the switched live.

I believe you.

[John Rumm]

Dave said, feed power to the wiring centre from the FCU, and then take all required connections to/from the boiler.

[Peter B]

Boiler has its own internal pump - the one shown is for the UFH manifold.

[John Rumm]

ok makes sense ;-)

[Peter B]

Makes sense in my head too ... only problem is I've now got to start turning it into actual reality :)