RE: Thermostat with RS232

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

Paul,

Exactly right.

The control unit runs off 12vDC. If you're importing from the US you can
either replace the power supply with a generic one from Maplins etc or
use the original power supply with a step-down transformer (more
expensive). I believe the units sold by Lets Automate have a UK power
supply included.

regards,

Julian


-----Original Message-----
From: Paul Robinson [mailto:ukcueman@xxxxxxx]
Sent: 25 February 2003 15:20
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Thermostat with RS232


Let me see if I've got this straight...I think need an idiot's guide to
this...

Looking at the TR15 manual, it looks like the wall display unit sends a
DC signal to the controller,
and the controller takes a 24VAC input and uses internal relays to feed
a heating system expecting
24VAC.

So I would need to connect an external relay that would take the
switched 24VAC from the TR15
controller as the signal to switch 240VAC that goes to the heating
system. Is this right?

Does this then mean I'd also need a 240VAC to 24VAC transformer to give
the TR15 the power it
expects?

Thanks,
Pau

----- Original Message -----
From: "Kenneth Watt" <kwatt@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, February 25, 2003 2:52 PM
Subject: RE: [ukha_d] Thermostat with RS232


> > What components do you need to use to get around the 24V/240V
problem?
> How
> > are they wired?
>
> A relay that is capable of shifting 240AC to 24V DC readily available
> from RS Components and some others, RS do a nice multi-voltage one.
>
> After that it's just DCV in from the stat to operate the relay and
mains
> out as to operate the boiler basically creating a switch at that point
> operated remotely by the stat.
>
> The RCS TX15B X10 thermostat is the same deal.
>
> HTH
>
> K.
>
>
>
>
> http://www.automatedhome.co.uk
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