Re: Re: Zoned Heating Control

["David Gumbrell" <david.gumbrell@xxxxxxxxx>]

Most of the actuators that I have seen are basically the same as TRVs
(and
fit on TRV valve bodies which have a plunger action), using a wax capsule
that is heated via 24V/240V supply. There was one I saw that seemed to have
some kind of modulation of the heating as far as I can tell to get 0-10V
proportional action and there are also some that are mechanical (Danfoss
for
EIB as I recall).

I've got some of the Sauter ones (look identical to Oventrop) but I haven't
had time to put all the wires in yet.

I guess with external control I could modulate the wax heater, but I doubt
it will be worth it on my system/house.

Cheers,

David

On 4/16/07, Mal Lansell <mal@xxxxxxx> wrote:
>
>   --- In ukha_d@xxxxxxx <ukha_d%40yahoogroups.com>, "Neil
Ball"
> <neilball@...> wrote:
> >
> > The actuators do not rotate, they simply move the valve stem up
&
> down hence
> > why it is not a problem :-)
> >
> >
> >
> > Neil B.
> >
> >
>
> I thought these were add-on controls, though - i.e. ones that are
> supposed to fit on existing valves (which would normally be of the
> rotating type)
>
> Mal
>
>
>


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