On Mon, 26 Jan 2009 14:26:12 +0000, Mike wrote:

On Mon, 26 Jan 2009 10:38:32 GMT, "ARWadsworth"
wrote:


"Mike" wrote in message
. ..
On Sun, 25 Jan 2009 10:46:49 +0000, David Hansen
wrote:

On 24 Jan 2009 15:01:24 GMT someone who may be "Bob Eager"
wrote this:-

The difficult bit was getting cable with the right rating and number
of cores. In the end I went to the local plumbers merchant, and even
they struggled. In the end they found me a 'reel end' and I got it
for a pound!

http://www.tlc-direct.co.uk/Products/CA0dot75F7.html has six cores
plus protective conductor. That should be fine for most household
systems. Unused cores can be terminated and left spare.

While six cores plus cpc is suitable for Y plans - I've used it
myself, unfortunately you need seven plus cpc for S plans. I'm not
aware of any supplier of this.



I wire up S plans quite often and I have never needed 6 cores plus CPC.

Do not leave me guessing, why did you need more than 6 cores?

From the standard Honeywell diagram

Really ****ty copy here
http://content.honeywell.com/uk/homes/Schemes/s1.jpg

Terminal 1 Grey wire to both zone valves (common contact) Terminal 2
Blue wire to both zone valve motors Terminal 3 Green Yellow cpc to both
zone valves Terminal 5 Brown to heating zone valve motor Terminal 6
Unspecified colour to cyl stat normally open Terminal 8 Brown to cyl
stat common and hot water zone valve motor Terminal 10 Orange wire to
both zone valves (Normally open contact)

I can't see any further scope for core sharing and so make that 6 cores
plus cpc. (not the seven plus cpc I said)

Maybe it was 5 plus cpc for Y plan and 6 plus cpc for S plan and it was
the 6 plus cpc I couldn't find This would be around 8 or 9 years ago I
went round all the local electrical factors plus Newey and Eyre and CEF.

I would have preferred to go S Plan because I had previously acquired a
large box of unused 2 port 22mm valves at an auction and the desire to
use a single cable rather than a hotch potch of T&E on a brand new build
mean that none of them got used and I had to go out and buy half a dozen
3 port valves (it was a multiple holiday let installation)

Perhaps the wiring centre should go nearer the zone valves?


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html

"Mike" wrote in message
...
On Mon, 26 Jan 2009 10:38:32 GMT, "ARWadsworth"
wrote:


"Mike" wrote in message
. ..
On Sun, 25 Jan 2009 10:46:49 +0000, David Hansen
wrote:

On 24 Jan 2009 15:01:24 GMT someone who may be "Bob Eager"
wrote this:-

The difficult bit was getting cable with the right rating and number of
cores. In the end I went to the local plumbers merchant, and even they
struggled. In the end they found me a 'reel end' and I got it for a
pound!

http://www.tlc-direct.co.uk/Products/CA0dot75F7.html has six cores
plus protective conductor. That should be fine for most household
systems. Unused cores can be terminated and left spare.

While six cores plus cpc is suitable for Y plans - I've used it
myself, unfortunately you need seven plus cpc for S plans. I'm not
aware of any supplier of this.



I wire up S plans quite often and I have never needed 6 cores plus CPC.

Do not leave me guessing, why did you need more than 6 cores?

From the standard Honeywell diagram

Really ****ty copy here
http://content.honeywell.com/uk/homes/Schemes/s1.jpg

Terminal 1 Grey wire to both zone valves (common contact)
Terminal 2 Blue wire to both zone valve motors
Terminal 3 Green Yellow cpc to both zone valves
Terminal 5 Brown to heating zone valve motor
Terminal 6 Unspecified colour to cyl stat normally open
Terminal 8 Brown to cyl stat common and hot water zone valve motor
Terminal 10 Orange wire to both zone valves (Normally open contact)

I can't see any further scope for core sharing and so make that 6
cores plus cpc. (not the seven plus cpc I said)

Maybe it was 5 plus cpc for Y plan and 6 plus cpc for S plan and it
was the 6 plus cpc I couldn't find This would be around 8 or 9 years
ago I went round all the local electrical factors plus Newey and Eyre
and CEF.

I would have preferred to go S Plan because I had previously acquired
a large box of unused 2 port 22mm valves at an auction and the desire
to use a single cable rather than a hotch potch of T&E on a brand new
build mean that none of them got used and I had to go out and buy half
a dozen 3 port valves (it was a multiple holiday let installation)


--

You are correct Mike. It would be 7 core doing it your way on the S plan. My
apologies.

Adam

On Mon, 26 Jan 2009 21:44:28 GMT, Ed Sirett
wrote:

Perhaps the wiring centre should go nearer the zone valves?

The wiring centre at the cylinder end is within a foot or so of the
diverter valve and cylinder thermostat - I couldn't really get it any
closer nor would it serve any purpose. From there I ran a 5 core and
cpc cable to another wiring centre adjacent to the boiler - around a
20 metre run.

There is a 3 core from a switched fused spur connected to the boiler
wiring centre. From the boiler the L, N, Ls, Ns, and Lr, and earth run
in a short length of 5 core + cpc to the boiler wiring centre.

From the boiler wiring centre there is a 5 core + cpc to the hot water
timer and the wireless stat "head end" located in the main living
area, the boiler being remotely located in an outhouse. This gives a
local indication that the boiler should be firing, it also removes any
possibility of the wireless stat not working due to the 18 inch thick
stone walls and foil vapour barriers. The cores in this last run were
allocated as live, neutral, cpc, hot water on , hot water off, and
heating demand.

With only 5 cores and a cpc running from the bottom to the top of the
house I only connected to six of the ten terminals in the wiring
centre but what is terminated on a specific terminal in one wiring
centre is presented in an identical manner in the other one - I
followed the Honeywell standard layouts to the letter.

All wiring from the motorised valve uses the standard flex supplied
and terminated directly into the cylinder wiring centre. The cylinder
stat (double insulated so no earth required) uses a 3 core terminated
into the same wiring centre - the green yellow being sleeved and used
for the NC contact - going back to the original subject of this
thread!

With the floors not fully laid upstairs and suitable access holes
predrilled and sleeved with conduit I (almost single handed)
installed, tested and commissioned the entire CH wiring in each
property from start to finish in half a day. When deciphering the
ratsnest left at my parents place by a "pro" I spent longer than that
sorting out a wiring diagram with multiple unlabelled T&E's, a wiring
centre packed to the lid with overlong cores and a timer controller
placed in such a crazy position only a contortionist with a flexible
neck and a very small body could read the LCD display.


--