S Plan Plus - Wiring Diagram

[stevo23777]

Hi Guys

I currently have a combi boiler with a single prog stat wired direct to the boiler. I am putting in UFH in my kicthen diner and have to zone off using an S Plan Plus config. I have a Worcester Bosch boiler. I have drawn up the attached wiring diagram, would anyone be able to verify if I have made any drastic mistakes (I don't have a HW cylinder).

Many Thanks

 

[Masood]

Doesn't look quite right - the boiler switched live should come off the orange wires from the 2-port valves to prevent boiler firing until valves are open.

Also switched neutral (Ns) is redundant.

Why don't you just download the S+ plan wiring diagram from the Honeywell website instead of reinventing the wheel?

 

[Unregistered]

Apologies the grey wires in my diagram should be orange, which go from 'activated' zone valve to live return on boiler. The Ns according to boiler manual is Neutral Supply not switched neutral.
Wanted to draw up my own diagram as the timer and stat are single 'appliances' and I don't have a cylinder so it confuses me less!! Also - another question if I can, the UFH has a manifold mixing pump, should this be activated from block 10 also so it only kicks in when boiler is activated? Although in this diagram it will start if either CH or UFH are activated, so should it be run from block 5 switched live?

 

[Dotty]

Take it you're gsr? You can't be opening up your boiler if you're not.

Depending on which model it is of course.

 

[Johnmdc]

Looks okay to me. Yes connect pump to terminal 5.

 

[Masood]

Apologies the grey wires in my diagram should be orange, which go from 'activated' zone valve to live return on boiler. The Ns according to boiler manual is Neutral Supply not switched neutral.
Wanted to draw up my own diagram as the timer and stat are single 'appliances' and I don't have a cylinder so it confuses me less!! Also - another question if I can, the UFH has a manifold mixing pump, should this be activated from block 10 also so it only kicks in when boiler is activated? Although in this diagram it will start if either CH or UFH are activated, so should it be run from block 5 switched live?

Yes, then it's OK. As already confirmed, terminal 5 for the UFH pump. I still don't like the layout though. Why don't you put L, N, E into the wiring centre then everything including the boiler connects into that rather using the boiler as a junction box?