Simplified S-Plan and Y-Plan Wiring diagrams

Jamchiv01 · Nov 20, 2016

To anyone that finds a use for these:

[ElectriciansForums.net] Simplified S-Plan and Y-Plan Wiring diagrams

bigspark17 · Nov 20, 2016

Note, diagrams for use with system boilers.

Leesparkykent · Nov 20, 2016

I don't think they are as they have an external pump (system boiler will have internal pump). These diagrams are for regular boilers without pump over run.

Jamchiv01 · Nov 20, 2016

The diagram can be used as a boiler with a pump overrun as well, you just take the pump live / neutral / Earth from the wiring center and run it to the boiler terminals. It's just a guideline on how the average boiler is wired. It can be adapted how you need it.

davesparks · Nov 21, 2016

Jamchiv01 said:
The diagram can be used as a boiler with a pump overrun as well, you just take the pump live / neutral / Earth from the wiring center and run it to the boiler terminals. It's just a guideline on how the average boiler is wired. It can be adapted how you need it.

Why run the extra N and E from boiler to wiring centre for the pump? That's just a waste of cable.

You diagrams suggest that some parts do not require an Earth in the S plan but do in the Y plan?

And the numbers are wrong for a lot of room thermostats

Jamchiv01 · Nov 21, 2016

Apologies, I uploaded an older version of the diagram as I have many copies. New Copies:

Also changed the roomstat terminals for ya.

As for running the neutral and earth from the boiler, I prefer to do it that way where possible so all the cables are together and I'm not borrowing neutrals from the wiring center. Also its always nice to have more cables than less when it comes to boilers. The price difference isn't that much.

Loki · Nov 27, 2016

Is it me but their seems to be multiple ways to wire s plan?
John Wards youtube video shows one way & Chris Kitcher shows a slightly different way

Sorry cant seem to delete duplicate pic using my ipad.

Leesparkykent · Nov 27, 2016

Loki said:
Is it me but their seems to be multiple ways to wire s plan?
John Wards youtube video shows one way & Chris Kitcher shows a slightly different way

Sorry cant seem to delete duplicate pic using my ipad.

View attachment 34614

View attachment 34616

No not really mate, It just depends what boiler you have to connect up to the controls. For example some boilers will need just a switch line, neutral and earth. some boilers will need live, switch line, neutral and earth and some will need live, switch line, pump live, neutral and earth. If the boiler doesn't have pump live then the pump connects up with the oranges of the valves, if it does have a pump live connection then the pump connects to this in the boiler.

davesparks · Nov 27, 2016

Jamchiv01 said:
Apologies, I uploaded an older version of the diagram as I have many copies. New Copies:

Also changed the roomstat terminals for ya.

As for running the neutral and earth from the boiler, I prefer to do it that way where possible so all the cables are together and I'm not borrowing neutrals from the wiring center. Also its always nice to have more cables than less when it comes to boilers. The price difference isn't that much.

The terminals are still wrong for a lot of room stats, but at least make a bit more sense.

That is not a borrowed neutral, it is all part of the same circuit, it just shows a lack of understanding of the actual circuit and a 'wire by numbers' approach.

Jamchiv01 · Nov 27, 2016

I know it's not a borrowed neutral, the title says "Simplified". I am trying to draw as little on the diagram so it's easier for people to follow and understand how the systems work and what each component needs.

The numbers are there purely for an aid to other people using the diagram.

I understand the diagram fully, I don't see how you can say I have a lack of understanding? I have wired many boilers and all have worked perfectly fine with no issues.

I didn't design this for the general public to use, it's for competent persons who have an understanding of how things should be wired. Hence me posting it on "electriciansforums" not "diy.whatever"

As you stated yourself, it's not a borrowed neutral, so you would wire it back to the terminal block. Same with the Perm Live for the valve.

I appreciate the feedback, but I don't see the need to change it. If someone was to actually take the valve apart to borrow the neutral / live and feed one cable back to the terminal strip, then the issue is with them not the diagram. I'd like to think everyone has more common sense than that.

If A member of staff believes that it is indeed inaccurate, feel free to remove the whole post altogether.

N6rul · Jun 14, 2017

What matters sometimes is the intent to help others....
I see why your Getting upset, but don't take it personally...
some people just have a different way of helping...sometimes in when writing, things don't come out the way it should...
keep up the good work mate...
I have passed some of these diagrams onto my trainees...

Marti · Jul 2, 2017

Diagrams and discussion appreciated. On site explanations can sometimes be a bit rushed. Pre-reading opinions and diagrams avoids the blank look of total incomprehension; in my case to ERR... incomprehension

Scott48 · Jul 7, 2017

Surly the valve orange goes to boiler switch live as all boilers I've worked with need permanent live and they don't need simplifying them
Heatings are the easiest thing to do if u have a basic understanding of electrics

Jamchiv01 · Jul 7, 2017

Scott48 said:
Surly the valve orange goes to boiler switch live as all boilers I've worked with need permanent live and they don't need simplifying them
Heatings are the easiest thing to do if u have a basic understanding of electrics

Yeah, your right, I never even realised I had it going into L not SW. Opps