Re: Control of ventilation system

[Martin Howell <martin.howell@xxxxxxxxxxxx>]

Hi Tim,

Thanks for the offer.  The unit has a hard wired control panel,
connected via 4 core cable to the control PCB inside the main housing.
The only diagram I have shows the connections as:-  +12v; GND; HI; LO,
and I don't have a circuit diagram of the main system board.  The
control panel has buttons to increase/decrease the fan speed and
temperature, and some sealed electronics which I can't get to, which I
presume send an encoded signal along the HI/LO connections when the
buttons are pressed.  The only thing I can think of at the moment is to
put a scope on the signal connections and see what is going on, but i
was hoping someone else had already done it, lazy sod that I am  :-)

Martin

Hawes,Timothy Edward (GEG) wrote:

>Martin,
>
>Have you got an installation drawing for the system - something to show
>you what wires to connect to where etc. ?
>Does the unit have a central control box that the basic control panel
>plugs into or are the fans etc. wired individually.
>If you have a drawing please post it somewhere, or send it to me
>off-list and I'll do what I can to interpret it.
>
>I see on the UK_Selfbuild list there was a suggestion to use an
>intelligent relay (Siemens Logo et al) but you could also consider the
>NetIOM and the Web Brick, both are xAP-able (maybe xPL too, I'm not
>sure) and can switch outputs based on inputs etc. IIRC they also have a
>limited number of analogue I/O. The Web Brick also has a Dallas 1-Wire
>input so you can connect a temp sensor. A further alternative may be
the
>Barionet unit from Barix/Laser. IIRC this has been xAP-ed too and, like
>the Web Brick, has a 1-Wire interface.
>
>Web Brick www.o2m8.com
>NetIOM http://www.phaedrusltd.com/system/index.html
>Barionet http://www.laser.com/?laserlink=HABARIONET
>
>HTH,
>
>Tim.
>
>
>
>
>>-----Original Message-----
>>From: Martin Howell
>>
>>I have a Villavent whole-house ventilation system, and its v good.
>>However, the controls are very on/off and manual, and I would
>>like to apply some intelligence to it - for example: in the
>>winter, monitor outside temperature and stop the intake of
>>air if it drops below a certain temperature;  in the summer,
>>turn the fans on to 'boost' if the temp in the house gets too
>>high, and so on.
>>
>>Does anyone here a) have a system like this that they have
>>taken control of, and/or b) know what the control panel
>>signals are likely to be so that a PC could simulate 'em?
>>I've tried talking to the company, and they're as much help
>>as a chocolate teapot.
>>
>>Martin
>>
>>
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