RE: Thermostat with RS232

["Julian Stuhler" <julian.stuhler@xxxxxxx>]

Hi Paul.

Shame about the ASCII art - took me ages ;-)

The control unit is powered by a single 12vDC power supply. This is used
to power the thermostat, the control unit electronics and the on-board
relays that provide the 24vAC output when the heating is activated.

Hope this makes sense.

Julian

From: Paul Robinson [mailto:ukcueman@xxxxxxx]
Sent: 25 February 2003 15:58
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Thermostat with RS232



Julian,

I think the formatting got messed up by the mail system, so I can't read
your ASCII art :-(

I think the only thing left confusing me is this: where does the 24VAC
come from in a UK system? Is
this the power supply unit you mentioned that comes with it? It looks to
me like I would need two
power supplies - one for 12VDC and one for 24VAC. Is this right?

Thanks for your patience!
Paul

----- Original Message -----
From: "Julian Stuhler" <julian.stuhler@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, February 25, 2003 3:24 PM
Subject: RE: [ukha_d] Thermostat with RS232


> Hi Paul.
>
> Firstly, I should start with a disclaimer. I am NOT an electrician,
and
> the following advice is based on the documentation I got with the
> product, the documentation for my existing heating system and some
> advice from a knowledgeable friend.
>
> The kit comes complete with the thermostat, control unit, X10
interface
> and power supply (I imported a US version so I had to get my own X10
> interface and power supply). It is designed to replace a standard US
> thermostat (which apparently seem to switch 24vAC). The doc for my
> heating system is very specific about the thermostat having to be
> capable of switching 240vAC, so what's needed is a way of safely
> switching that 240v with a 24v output.
>
> I've used the following items:
>
> - 24vAc single-pole plug-in relay, with 10A contact rating (CSE part
no
> 4031-8024)
> - Relay base, for mounting the relay (CSR part no 9563/B)
> - Two Maplins in-line fuses (one for each side of the relay)
> - Some breadboard and a screw-shut Maplins project box to house
> everything in.
>
> Wiring is as follows (hope this is legible!):
>
> As I said I'm awaiting the arrival of the relay before I can complete
> this (at the moment everything is wired in except the connection to
the
> heating system - I've bypassed the thermostat controls), so if anyone
> spots a problem with this please shout!
>
> regards,
>
> Julian
>
>
> ______________________
>
> Julian Stuhler
> DB2 Specialist, IBM Gold Consultant
> Triton Consulting - The Database Experts
>
> E-mail:         julian.stuhler@xxxxxxx
> Web:             <http://www.triton.co.uk/> http://www.triton.co.uk
> Mobile:                 +44 (0)7768 446927
> Personal Fax:   +44 (0)870 1243510
> Office Tel:     +44 (0)870 2411550
> Office Fax:     +44 (0)870 2411549
>
> -----Original Message-----
> From: Paul Robinson [mailto:ukcueman@xxxxxxx]
> Sent: 25 February 2003 13:05
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Thermostat with RS232
>
>
> Julian,
>
> What components do you need to use to get around the 24V/240V problem?
> How are they wired?
>
> TIA,
> Paul
>
>
>
> ----- Original Message -----
> From: "Julian Stuhler" <julian.stuhler@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Tuesday, February 25, 2003 10:52 AM
> Subject: RE: [ukha_d] Thermostat with RS232
>
>
> > I took delivery of a TR15 kit last week - it really is a very
neat
> unit.
> > However please be aware that the unit is only designed to switch
24vAC
> > and UK heating systems seem to need a thermostat capable of
switching
> > 240vAC! I also needed to move the location of the thermostat as
the
> > thermostat and control unit wouldn't talk to each other properly
over
> > the existing 3-core & earth cabling between the old
thermostat and
the
> > heating system. I used some 4-core security cable instead and it
works
> a
> > treat.
> >
> > I had a fun weekend wiring it in but I wasn't able to complete
the
job
> > as Maplins didn't stock the 24vAC relay I needed to allow it to
> operate
> > the thermostat input on my existing heating system. I eventually
> managed
> > to order one yesterday (from www.cse-distributors.co.uk).
Hopefully
> I'll
> > be able to complete the job this weekend.....
> >
> > Julian
> >
> >
> >
> > -----Original Message-----
> > From: Kevin Hawkins [mailto:lists@xxxxxxx]
> > Sent: 25 February 2003 00:17
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] Thermostat with RS232
> >
> >
> > RCS do some - the TR15 and TR36
> > http://www.resconsys.com/products/stats/serial.htm
> >
> >
> >
> > -         but  not cheap - the TR36 is particularly nice as I
believe
> it
> > has
> > a graphic LCD display screen and some buttons that can be
programmed
> to
> > display automatically some user defined menus. I have been
thinking
of
> > getting one for a while from the US.
> >
> >
> >
> > Kevin
> >
> >
> >
> > -----Original Message-----
> > From: Dean Smith [mailto:ukha@xxxxxxx]
> > Sent: 24 February 2003 23:48
> > To: Ukha_D@Yahoogroups. Com
> > Subject: [ukha_d] Thermostat with RS232
> >
> >
> >
> > I'd like to be able to control the temperature of my CH
thermostat
> > remotely
> > via a PC
> >
> > One route would be to have Temperature sensors connected to the
PC,
> and
> > then
> > have the PC directly control the On/Off of the Central Heating
(Which
> I
> > can
> > do now via Comfort and some relays to bypass the timer control
for
an
> > extra
> > hour when I want it). I'd like to avoid though having the PC as
> > absolutley
> > necessary for normal running - prefer it just as a means of
varying
> the
> > temperature when required.
> >
> > So anybody know of....
> >
> > A Thermostat capable of switching 240V
> > Temperature Set Point controllable via RS232
> > being able to Poll the Temp would be a bonus.
> > Remote temperature sensor would be Ideal aswell.
> >
> > And of course it has to be *cheap*. So Honeywell Smartfit is out
;-)
> >
> > Thanks
> >
> > Dean
> >
> >
> >

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