RE: Fw: How would YOU approach this HA task?

[Paul Gordon <paul_gordon@xxxxxxxxxxx>]

I think I'm leaning towards this as the simplest option...

Leave the existing controls as they are, - for the timeclock I'll
"de-program" any on times so that this never calls for heat. I'll
also turn
the existing wireless stat right down, so that also never calls for heat...
(although since it's in series with the timeclock that shouldn't actually
matter).

Put a CBUS relay across the boiler's heat demand terminals (now handily
available outside the casing)

Use a CBUS room stat to set the temperature (one of the relay-free models)

Therefore the existing controls are always available to be used if required
(just turn them up), but won't under normal circumstances
"interfere" with
or "override" what the HA system want to set..

"standard" end-user operation is maintained by setting a knob on
a
"standard" looking room thermostat (WAF)

Full control is available via any CBUS units, and therefore by Comfort, -
either of which I can use to set my heating schedule - I'll probably go for
using Comfort to do this, since it has easily accessible scheduling options
for weekday/weekend operation, knows about sunset/sunrise times, knows when
all the UK public holidays are, and knows the occupancy status of the
house...

The temperature measured by the CBUS roomstat is available as a datapoint
for use in any other logic operations I might want to contrive, also thus
available to be displayed on WISER based touchsreens etc. (not sure yet if
I
can also get that variable through to Homeseer for use there...)

Temperature setpoint can also be set remotely in addition to manually
adjusting the roomstat knob... so Wiser touchscreens can also be used as
remote temp controllers as well as simple on/off..

Easy-peasy!

Paul G.


-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Paul Gordon
Sent: 29 October 2010 09:01
To: ukha_d@xxxxxxx
Subject: RE: Fw: [ukha_d] How would YOU approach this HA task?

Thanks, I'll take a look at that one...

As it happens, the wireless receiver for the T-stat sits outside the boiler
casing anyway... the wiring arrangements for this require simply bringing
all the relevant connections out to a terminal block that forms the
backplate of the receiver, so future access to change the wiring to suit
whatever HA bits I want to add will be nice & easy...

Paul G.


-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
craig
Sent: 29 October 2010 08:38
To: ukha_d@xxxxxxx
Subject: RE: Fw: [ukha_d] How would YOU approach this HA task?

> connections outside the boiler simply because only a Corgi/Gas-Safe
> registered engineer is supposed to open the boiler. Of course Part-P
> probably applies to the wiring too :(

Another approach would be to use a room stat that has infra red capability,
eg heatmiser:

<http://www.heatmisershop.co.uk/products/Programmable-Thermostat-%252d-Heatm
iser-PRT.html>


and use infra red to control the heating from Comfort (or similar). You
would also be able to control the temp, rather than just on off.

This wouldn't require any complications with 'non-standard' wiring to the
bolier, and totally isolated from any CH electrical circuits.





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