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Discuss Check my wiring diagram in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

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  1. Gigsy
    Offline

    Gigsy Regular EF Member

    Location:
    Birmingham
    Hi I am training to an electrician.


    I am working as an electricians mate.


    I have been asked to draw a wiring diagram, would anyone check my diagram and see if there are any obvious mistakes please. We will be wiring it Friday, obviously it will be checked by the electrician I am working with, but to save any embarrassment I decided to post it here before he checks it.

    S-plan diagram.jpg
     
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  2. jackhammerJIM
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    jackhammerJIM Regular EF Member

    Location:
    north yorks
    No hot water valve so it must be a combi ?
     
  3. Gigsy
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    Gigsy Regular EF Member

    Location:
    Birmingham
    Yes it is a combi
     
  4. jackhammerJIM
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    jackhammerJIM Regular EF Member

    Location:
    north yorks
    Im not sure on the brown of the underfloor heating valve . It is connected into the Lr on the ufh manifold . If Lr is commoned to Sl of the stat terminal then it will work .
    That aside it is good
     
  5. Gigsy
    Offline

    Gigsy Regular EF Member

    Location:
    Birmingham
    The 1st thermostat, (21 Landing Thermostat), I have wired to S-plan connector 4, which goes to the combi boiler SL/Ls. It that right or would I connect it to connector 1 or does it not matter? Is SL/Ls on a boiler a permanent Line or does it ever switch off? I don't ever want to lose power to the thermostat as it is programmable.
     
  6. ImpededLoop
    Offline

    ImpededLoop Electrician's Arms

    Location:
    West Sussex
    Looks good. The plumber will want the fused connection unit next to the boiler in case you get asked about that.

    Well done for taking the time to figure it out and draw it.
     
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  7. jackhammerJIM
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    jackhammerJIM Regular EF Member

    Location:
    north yorks
    If the boiler goes into fault that SL output might turn off . Connect into terminal one and i would do the same with the zone valve greys
     
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  8. Gigsy
    Offline

    Gigsy Regular EF Member

    Location:
    Birmingham

    Ls and Lr on the ufh manifold is an un-powered relay. So the UFH thermostat tells the manifold it needs heat, the manifold closes the relay labelled "Boiler". That should then send a voltage back to SL/Lr at the combi boiler and ask it to turn on? Is this right?


    So effectively it will bridge SL and SI on the boiler, during the times the UFH needs hot water.
     
  9. Gigsy
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    Gigsy Regular EF Member

    Location:
    Birmingham
    Thank you :), took me all day, glad I did it tho
     
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  10. Gigsy
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    Gigsy Regular EF Member

    Location:
    Birmingham
    Thank you very much, :)
     
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  11. Gigsy
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    Gigsy Regular EF Member

    Location:
    Birmingham
    Noted, I will put it near the boiler :)
     
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  12. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    The diagram looks acceptable to me, I would have fed the ufh controls from Ls personally.
    If you take the feed from the switched fuse spur direct to the boiler and have all external controls fed from Last then when the boiler is switched off or the internal fuse blows all external controls will also be dead.
     
    • Agree Agree x 2
  13. Gigsy
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    Gigsy Regular EF Member

    Location:
    Birmingham
    Think I'll change it, thank you
     
  14. jackhammerJIM
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    jackhammerJIM Regular EF Member

    Location:
    north yorks
    UFH stat calls for heat , Manifold relay energises brown of zone valve and pump . UFH valve opens energising orange which fires the boiler .
     
  15. Gigsy
    Offline

    Gigsy Regular EF Member

    Location:
    Birmingham
    Thank you :)
     
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