Re: Re: Zoned Heating Control

[Mal Lansell <mal@xxxxxxxxxxx>]

Ah, ok.  So if I have TRVs, I can probably retrofit, but otherwise
it's
a plumbing job (liquids and I don't mix!)

Thanks

Mal


David Gumbrell wrote:

> 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 <mailto:mal%40lansell.org>>
> wrote:
> >
> > --- In ukha_d@xxxxxxx <mailto:ukha_d%40yahoogroups.com>
> <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
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>