Re: Fw: automated central heating

[Kim Wall <kim@xxxxxxxxxxxxxxxxxx>]

Stephen wrote:

> Is there any central heating controller that has an "aux
input", so
> that when this is activated, it switches on the heating? That way you
> could connect the cbus/x10/whatever to the aux input. Putting your own
> relays across the existing controller is ok because you know what you
> have done, but I worry about any plumber coming to service the boiler
> etc. he might switch off the controller but get zapped when the
> automated side switches on. If the automation was interfaced through a
> recognised contact, it might be safer in that respect.

I have my heating controlled by a relay across the room thermostat.  The
existing timer is set to permanently on, and the thermostat turned all
the way down (the automation system does its own temperature
measurement).  Thus, in the absence of the automation input (or indeed
if the temperature drops below 5C or so), the system functions as normal.

I would have thought that a plumber working on the system would isolate
the power using the switch/plug intended for the purpose, as simply
setting the timer to 'off' is likely to leave some of the wiring inside
the boiler, motorised valves etc. live.


Kim.


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