RE: Flow switches

[Paul Gale <groups2@xxxxxxxxxxxxxxxx>]

I've fitted flow switches to all of my shower hot water feeds (4 of
them) - have yet to program them up in HomeVision yet though. HV will
control my extract fans via CBus.

I did have a humidity sensor but never fitted it - I was thinking it would
need some careful calibration and monitoring over a year or so, so that it
wouldn't come on at odd times of day/night depending on the ambient
humidity.

I think running the fan on a timer, initiated by the start/stop flow of hot
water should be a good solution.

I bought my (cheaper) flow switches from CPC:

http://cpc.farnell.com/jsp/search/productdetail.jsp?SKU=SN35601

I found there were some very expensive switches around.

Paul.



> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of Neil Fuller
> Sent: 18 November 2008 19:41
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Flow switches
>
> John
>
> One of these would work
>
> http://www.pvl.co.uk/datafaxes/2134%20-%20Shower%20flow%20switch.pdf
>
> There's loads more on the market - Just google for Shower Flow Switch
>
> You could start the fan on water flow then wait until the extract
> humidity has dropped below a threshold to turn the fan off using one
of
> these;
>
> http://www.sensorsandtransmitters.com/products/5/by_type
>
> I think it's a far better idea than hum controlled fans which have a
> habit of turning on whenever the light is on and then running on when
> the light goes of until the hum drops (if the hum is low, it will go
> off
> as soon as the light goes off). All too noisy at night time!
>
> Cheers
>
> Neil
>
> John B wrote:
> >
> > Hi all,
> >
> > I'm currently remodelling the bathroom, and naturally adding as
much
> > HA as possible :-)
> >
> > I'm trying to automate the operation of the extractor fan, and
was
> > looking at fitting a flow switch to the shower's water supply to
> > control the fan.
> > (i.e. shower is switched on, fan switches on, shower switches
off,
> fan
> > runs for an overrun period then switches off)
> >
> > Has anyone done something similar? Or can anyone recommend a
decent
> > flow switch?
> > I have some spare inputs on Comfort that I'm guessing I can use
for
> > the flow switch, and the fan is on a C-Bus relay channel so it
> > shouldn't be a problem controlling it from Comfort.
> >
> > Ta for any help!
> >
> > John
> >
> >
>
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