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aus+uk / uk.d-i-y / Heating/DHW programmer wiring

SubjectAuthor
* Heating/DHW programmer wiringFrank
`* Re: Heating/DHW programmer wiringJohn Rumm
 `- Re: Heating/DHW programmer wiringFrank

1
Heating/DHW programmer wiring

<u_WcncJincMcq-X4nZ2dnZfqnPudnZ2d@brightview.co.uk>

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From: hom...@nowhere.me (Frank)
Subject: Heating/DHW programmer wiring
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 by: Frank - Tue, 12 Dec 2023 10:31 UTC

I've changed an ancient Centaur Plus 27 programmer for a Drayton Wiser
and I *think* I might have got the lives on the programmer (labelled 3
and 4) swapped over as the DHW is not turning on.

If I haven't got them swapped, and I check by swapping them now, will
anything nasty happen?

--
Frank

Re: Heating/DHW programmer wiring

<ula0hk$3n9st$1@dont-email.me>

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From: see.my.s...@nowhere.null (John Rumm)
Newsgroups: uk.d-i-y
Subject: Re: Heating/DHW programmer wiring
Date: Tue, 12 Dec 2023 16:08:20 +0000
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 by: John Rumm - Tue, 12 Dec 2023 16:08 UTC

On 12/12/2023 10:31, Frank wrote:
> I've changed an ancient Centaur Plus 27 programmer for a Drayton Wiser
> and I *think* I might have got the lives on the programmer (labelled 3
> and 4) swapped over as the DHW is not turning on.

Depending on how the controls are wired, and what type of valves you
have, you may need to use the "HW Off" output rather than (or as well
as) the "HW On" one.

See the circuit diagrams here:

https://wiki.diyfaq.org.uk/index.php/Central_Heating_Controls_and_Zoning

> If I haven't got them swapped, and I check by swapping them now, will
> anything nasty happen?

Yup, a cold bath :-)

(but you are unlikely to blow anything up)

--
Cheers,

John.

/=================================================================\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/

Re: Heating/DHW programmer wiring

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From: hom...@nowhere.me (Frank)
Subject: Re: Heating/DHW programmer wiring
Newsgroups: uk.d-i-y
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 by: Frank - Sun, 7 Jan 2024 14:44 UTC

On 12/12/2023 16:08, John Rumm wrote:
> On 12/12/2023 10:31, Frank wrote:
>> I've changed an ancient Centaur Plus 27 programmer for a Drayton Wiser
>> and I *think* I might have got the lives on the programmer (labelled 3
>> and 4) swapped over as the DHW is not turning on.
>
> Depending on how the controls are wired, and what type of valves you
> have, you may need to use the "HW Off" output rather than (or as well
> as) the "HW On" one.
>
> See the circuit diagrams here:
>
> https://wiki.diyfaq.org.uk/index.php/Central_Heating_Controls_and_Zoning
>
>> If I haven't got them swapped, and I check by swapping them now, will
>> anything nasty happen?
>
> Yup, a cold bath :-)
>
> (but you are unlikely to blow anything up)
>
Thanks, the diagram was really useful. I was able to short the DHW stat
at the wiring panel and the motorised valve didn't move. Looks like it's
deceased.

--
Frank

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