RE: Re: X10 Relay Switch for boiler

[neil_frost@xxxxxxxxxxxxxxxxx]

Would it not be possible to use, say xPL or xAP, to detect the temperature
using one or more ds1820 temp sensors and a bit of "magic" at the
backend
saying:

if housetemp < %temp% deg the switch a relay or something ON else switch
it OFF???

%temp% would be a dynamically assigned value...

Could you use a relay module on VIOM or just use a SIOM??? If you only had
single zone central heating, you could take an average of multiple temp
sensors??

Neil

-----Original Message-----
From: Hawes,Timothy Edward (GEG) [mailto:haweste@xxxxxxx]=20
Sent: 12 November 2004 14:40
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Re: X10 Relay Switch for boiler


> -----Original Message-----
> From: steve@xxxxxxx Sent: 12 November 2004 14:06
>=20
> --- In ukha_d@xxxxxxx, "Hawes,Timothy Edward \(GEG\)"
> <haweste@a...> wrote:
>=20
> > How much is "a lot of money" ? You should be able to
get a
> reasonable
> > > electronic programmer for under 40 quid
>=20
> OK, so it wasn't that much money (although considerably more than
> =A340) I just want to "automate it" :-)

That's no problem - I just thought I'd mention that a (basic) programmer
might be worthwhile if you ever get a problem with your own controls :-)
=20
> I have the wiring diagram...
>=20
> http://www.tedsoft.co.uk/diagram.gif
>=20
> Am I right in thinking I could just fit a appliance module to L an
N=20
> and have the output going to 2? Or have I just blown myself up? :-)

Unfortunately this is where my detailed knowledge of an X10 module ends.
On that basis, what I'd do would be to connect the output of the appliance
module to the coil of a 240V AC-coil relay, and connect one set of
contacts from the relay to points 1 & 2 on your diagram. This presents
a
"volt free" contact to your boiler, similar to the contacts in
the room &
frost stats (i.e. a simple switch contact).

I see others have commented on wiring a module in directly, but while my
method may be more involved and use more parts, there's no danger of
putting 240V into the boiler at the wrong place, since it uses the
boiler's own "control circuit voltage" to sense whether to turn
on or not.
=20
> Luckily I'm not going to be doing it myself, I just want to know
which=20
> bits to buy...

I know what you mean. Messing around with 12/24V is one thing, 240V always
makes me think twice :-o
=20
> Cheers
>=20
> Steve

Cheers,

Tim H.

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