just studying s plan wiring diagrams...

[mutley racers]

With different programmers. I see in the honeywell wiring guide, using the honeywell wiring centre it has in the back a list of programmers to connect into this circut, and where to connect the terminals into the wiring centre.

With the horstmann 2 channel programmer, it says put the hw off lead to 7 into the wiring centre, which has no other lead connected. But, if you end up using 3 x 2 mv's, then you have the orange going to 7 in wiring centre with stat. So does hw off from the timer still go to number 7?

Hope that makes sense chaps

 

[mutley racers]

Oh, is this just for a y plan system? You don't have a hot water off connection?

Really need to get my head around these. Have been pretty slack last couple of yrs

 

[mutley racers]

Forget I asked this question. It is quite simple when you look at it

 

[Ray Stafford]

Did you enjoy that conversation with yourself?

 

[mutley racers]

Hehe I did

 

[Kev the gas]

The best advice I could give is forget the manufacturers grey goes to no 7 ect.

Get in your head what each coloured wire should be doing, and how many connections it should! have.

Remember when fault finding not to blame a component straight away, it may have been the tw.t of an installer before you making a pigs ear of it

 

[mutley racers]

That is exactly what I am doing now. Going through the sequence of operations and realising what each wire does

 

[Reg Man]

Love it ! Like thinking aloud. I think S Plan is great, much more versatile.

 

[stevetheplumber]

s plan every time for me makes fault finding a doddle and its can be expanded to incorperate zones and unvented systems easily

 

[levi6482]

Where can I get these wiring guides??

 

[Reg Man]

Just Google S Plan wiring diagram and you will find it.

 

[mountainman]

Forget I asked this question. It is quite simple when you look at it

Nice one MR, once you forget the earth and neutral leads there are only a few wires left.
:thumbup::thumbup:

 

[tamz]

These animated diagrams will help you get your head around them

Honeywell Y-Plan Explanation

 

[Dickie]

With an S plan just remember you have 2 channels of switched wires in series: one HW & one CH. As said all neutrals & earth wires are common. The only other thing is a perminant live switched by the zone valve micro switch pulling on the boiler.
A very simple 'on/off' control system.

 

[doitmyself]

With an S plan just remember you have 2 channels of switched wires in series

I know what "in series" means, but I'm not sure what you mean.

 

[Ermintrude]

In series isn't correct. They are parallel as they can act independently.

Series is like having three ISo valves on a supply close one and all are off .

Parallel is three supplies into same pot , open one and water is on.

 

[Ermintrude]

DHW switch wire is in series with cylinder stat and heating in series with room stat. But not each other .

 

[heliotrope]

In series isn't correct. They are parallel as they can act independently.

Just goes to prove, don't matter how long in the plumbing trade there is always
something new to learn

 

[Dickie]

In series isn't correct. They are parallel as they can act independently.

Series is like having three ISo valves on a supply close one and all are off .

Parallel is three supplies into same pot , open one and water is on.

I don't think so, it's two circuits in series, they're not parallel circuits, well not the ones Ive wired for the last 30 years!!

 

[Dickie]

DHW switch wire is in series with cylinder stat and heating in series with room stat. But not each other .

Yes, that's why they're in series circuits.

 

[heliotrope]

Think Dikky need to go back to school.
Zone valves are not wired in series.
Learn a bit from Ermintrude:clap:

 

[Dickie]

Please enlighten me chaps, why are zone valves not wired is series?

 

[kay-jay]

Lol you've just answered your own question.....

 

[Howsie]

Lol. They are in series with the stats in two separate circuits.

 

[kay-jay]

If they were wired in series like the lightbulbs in your picture then all three would need ti be energized to make a one zone circuit.

Parallel diagram shows how three valves create three zones