Re: Thermostat with RS232

["Paul Robinson" <ukcueman@xxxxxxx>]

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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