Re: Intelligent AC motor control

["rb_ziggy" <rb.lists@xxxxxxxxxxxx>]

Nigel

Good idea.  I've a similar unit (normal and boost) from Rega.  Had it
about 5 years and I swear by it for keeping the house properly
ventilated and comfortable.  Even in the depths of winter we get no
significant condensation even when bedroom doors are closed. We run on
normal almost all the time.  Boost is (according to our instructions)
for clearing the bathroom faster after showers/baths etc - it's not
really for boosting air into the rest of the house. (After all, you
want to keep this to a minimum conducive to good ventilation.
Although, clearly, if you suck more out, the equivalent will come in
from outside!)

I must admit, we rarely use boost as the switch is in the airing
cupboard in the landing and it's only ever me who thinks about it. So
a HA boost switch would be ideal.  My thought is for a humidity
controlled switch that turns the boost on and off again.  We have 3
bathrooms so that means 3 humidity switches...

BTW we also have a Summer setting.  This leaves the extract fan
running (taking damp air out from the wet rooms) and switches off the
incoming fan.  Advantage, saves a bit of money and with windows open
in the summer, there is no real need for the incoming stream anyway
(no advantage in the heat exchange - actually, you don't really want
it).

I'd be interested if you progress the automation here.

Regards

Richard

--- In ukha_d@xxxxxxx, "Nigel Giddings" <nigel@...> wrote:
>
> David,
>
>
>
> I have just fitted a MVHR box from Greenwoods. A very basic model that
> uses two AC motors. It is wired with a transformer on the extract side
> so that you can vary the 'Normal' setting by changing the Transformer
> taps or have a 'Boost' setting which is basically flat out.
>
>
>
> At the moment it is wired permanently to the normal setting. I was
going
> to use a change over relay to switch between Normal and Boost, they
> supply a 2 way switch for this but its not very HA.
>
>
>
> I not sure how much control you need. It would seem two settings are
> adequate here. It is only background ventilation anyway. The boost may
> be useful in the depths of winter during the day with a full house and
> the windows closed, at the moment I only have about 6 weeks experience
> and most of that is negated by solar gain from the windows and people
> opening windows. Rooms that are kept closed for 24 hours plus do
settle
> at a comfortable level, especially the basement cinema room. The Games
> room is being over heated by the boiler / heatstore at the moment and
> Node 0 is probably hot enough to make bread in....
>
>
>
> HTH
>
>
>
> Nigel
>