Re: Boiler / Wiring - Emergency response needed from a spark etc

[Neil Fuller <neil.fuller@xxxxxxxxx>]

Having spoken with Chris, it would seem that he has a 3-port valve aka
Y-plan.

The "boiler" on the first floor is the DHWS cylinder

I've sent him a wiring diagram and an explanation of how the system works.

Hopefully, this should resolve his problems and provide a nice warm
house and shower for his SWMBO to move in to tomorrow :-)

Anyone interested in this system should also refer to;

http://content.honeywell.com/UK/homes/files/pag109.pdf

Anyone installing a new system would do well to avoid the Y Plan and go
for two x 2-port valves aka the S-Plan, or better still, zone the
upstairs and downstairs with an additional 2-port valve, known as the
S-plan Plus.

Details here;

http://content.honeywell.com/uk/homes/systems.htm

Cheers

Neil


Regards

Neil

Chris Miles wrote:
>
> My father in law changed the front and back plate of a drayton
> programmer and is certain every wire is
> wired exactly the same way they were. Something is not right though.
>
> The upstairs hot water boiler is working ok, but the downstairs
> central heating boiler is not working.
>
> this is how the manual says the circuit works... although it does not
> specify how to wire it
> up when including a remote thermostat in the circuit (the thermostat
> manual doesnt say either)
>
> http://www.chrismiles.pwp.blueyonder.co.uk/therm1.gif
> <http://www.chrismiles.pwp.blueyonder.co.uk/therm1.gif>
>
> I understand this I believe (correct me if I am wrong)
>
> HW = hot water
> CH = call for hear
>
> both of which have an ON and an OFF position.
>
> And here is how it is currently wired.
>
> http://www.chrismiles.pwp.blueyonder.co.uk/therm2.gif
> <http://www.chrismiles.pwp.blueyonder.co.uk/therm2.gif>
>
> First question:
>
> the hot water works fine so I am assuming that the HW is working fine,
> although I am confused to why
> the live wire going upstairs is connected to the OFF terminal rather
> than the ON terminal. I know this
> was *definately* correct as the ON terminal is screwed right down and
> has never been opened to allow
> a wire in.
>
> Second question:
>
> I assume when the second relay kicks in and switches to the ON
> position, current is sent up the yellow
> wire to the "call for heat" terminal at the thermostat,
should this
> yelllow wire connect into the L terminal
> or the "call for heat" terminal on the thermomstat?
>
> I assume it doesnt really matter what way round yellow and red are
> anyway? Can I do this.
>
> At the programmer... take the yellow as the switched live to the L
> terminal on the thermomstat, then
> take the red wire back up to behind the programmer and connect to the
> red wire for the boiler using
> a 13amp connector block just like shown on the picture ?
>
> Third question:
>
> The theromstat says it is essential to have a neutral connection, at
> the theromstat the blue wire coming
> from the programmer is connected to the N terminal, however at the
> programmer it is not connected to
> the other N terminal as you can see in the picture, and like I said my
> father in law is absolutely certain
> thats how it was wired.
>
> Please help if possible
>
> many thanks
>
> Chris
>
> [Non-text portions of this message have been removed]
>
>



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