Check my wiring diagram

[Gigsy]

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.

 

[jackhammerJIM]

No hot water valve so it must be a combi ?

 

[Gigsy]

No hot water valve so it must be a combi ?

Yes it is a combi

 

[jackhammerJIM]

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

 

[Gigsy]

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.

 

[ImpededLoop]

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.

 

[jackhammerJIM]

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

 

[Gigsy]

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

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.

 

[Gigsy]

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.

Thank you , took me all day, glad I did it tho

 

[Gigsy]

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

Thank you very much,

 

[Gigsy]

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.

Noted, I will put it near the boiler

 

[davesparks]

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.

 

[Gigsy]

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.

Think I'll change it, thank you

 

[jackhammerJIM]

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.

UFH stat calls for heat , Manifold relay energises brown of zone valve and pump . UFH valve opens energising orange which fires the boiler .

 

[Gigsy]

UFH stat calls for heat , Manifold relay energises brown of zone valve and pump . UFH valve opens energising orange which fires the boiler .

Thank you