wiring diagram

[good old the jazz]

Has anybody got an s plan wiring diagram with a typical pump overrun
set up on it?

thanks

 

[ChrisR]

Well yes, because I designed some, which hold a valve open while the pump's running.

But if you mean you have a bypass, then you simply take the pump power from the boiler, it doesn't involve the valves.
If you don't have an overrun on the boiler you can easily add one. Use a pipe stat, with the common going to the pump. When the pipe's hot, power to the pump comes from the permanent live, and when it's cold, from the switched live.

 

[simond]

This sounds like a simple request, I can't understand what ChrisR is talking about.

If you have a pump over run boiler, simply wire the pump direct to the boiler, ignore the S plan in this respect. Don't pass go, don't collect £200.

Your boiler 'switched live' is shown as the 'live to the boiler' in the S plan. Finally, the boiler needs a permanent live connection which may not shown on your diagram. This can be taken direct from the fused connection unit or the permanent live in your wiring centre.

Everything else is as per your S plan diagram.

 

[D_Hailsham]

the boiler needs a permanent live connection which may not shown on your diagram. This can be taken direct from the fused connection unit or the permanent live in your wiring centre.

There should be one switch which acts as the isolator for the system.

There are two options:

1. Provide the switched feed directly to the boiler and run a 230v 2 core plus earth feed from the boiler to the wiring centre.

2. Provide the switched feed to the wiring centre and run a 230v 2 core plus earth feed from wiring centre to boiler.

If the pump is within the boiler, you are in luck; but, if like me your pump is in the cupboard with the hw cylinder, and MV, you will need to run a feed from the boiler to the pump. This only needs to be a single (live) core as the pump can pick up its neutral and earth in the cupboard.

The switched live from wiring centre to boiler can be the other core of a two core cable (suitably labelled).

You could use a three core plus earth (pump in boiler) or a five core plus earth (pump in airing cupboard).

 

[good old the jazz]

Ok,just now the boiler live goes into the pump live at wiring centre.

so i take boiler live out and make it permanent live(at wiring centre)

run a new cable to boiler from pump live (at wiring centre)to boiler switched live?

BTW its a Vaillant ecotec plus 438 on the MI,s it shows a pump connection L N E i take it the live is the switched live?

And i dont need to run a N and E as i have picked that up at the wiring centre?

 

[D_Hailsham]

Ok,just now the boiler live goes into the pump live at wiring centre.

Do you mean the switched live to the boiler? If so, the pump live will need to be connected to a spare terminal.

See the Ecotec Manual page 22 Figure 4.8

The terminals marked "Mains Supply Connection" are the supply to the boiler. They are also the mains link to the wiring centre. The pump is connected to the teminals marked "Pump Connection". If the pump is near the boiler , run a two core plus earth from the pump connections to the pump. If the pump is near the wiring centre just run the live connection from the Pump Connection L terminal to the wiring centre and connect the pump L to that terminal. The pump N and E connections can be made at the wiring centre. This diagram may help. It shows the alternative mains connections as well

View media item 2871
The pump is controlled by the boiler; it has nothing to do with the switched live connections which make the boiler run.

Look at page 25 fig 4.11. The switched live connection from the wiring centre is made to terminal 4. The link between 3 and 4 has to be removed.

 

[good old the jazz]

good old the jazz wrote:
Ok,just now the boiler live goes into the pump live at wiring centre.

Do you mean the switched live to the boiler? If so, the pump live will need to be connected to a spare terminal.

Yes i mean the SL from the boiler.

So 4 on the boiler is the SL?

 

[simond]

--------------------------------------------------------------------------------

simond wrote:
the boiler needs a permanent live connection which may not shown on your diagram. This can be taken direct from the fused connection unit or the permanent live in your wiring centre.

D

Hailsham wrote
There should be one switch which acts as the isolator for the system.

Obviously, is anyone suggesting otherwise?

It is pin 4 for the boiler switched live.

Usually with a Vaillant you take the permanent live from pin3 for the timeclock etc. although because the 4 series Vaillant (which is a UK made Glowworm lookilikey) is different in architecture to the German designed 6,8 and 9 series this isn't so important.

 

[good old the jazz]

So the 4 (SL) will be 230v ?

And where is the best place for the isolater?

Near the boiler?

Or near the programmer ?with is in a cupboard in hall ,boiler is in utility room at rear of house.

 

[D_Hailsham]

simond wrote:
the boiler needs a permanent live connection which may not shown on your diagram. This can be taken direct from the fused connection unit or the permanent live in your wiring centre.

D Hailsham wrote:
There should be one switch which acts as the isolator for the system.

Obviously, is anyone suggesting otherwise?

I just thought that what you wrote could have been taken to mean that it was OK to take a second permanent live to the boiler, independent of the permanent live to the wiring centre.