Re: LD10 with bathroom light and automatic fan

["e1230758" <tom@xxxxxxx>]

The requirement for the time delay comes from Part F (Means of
ventilation) Para 1.5 of the building regulations, This requires the
fan delay in habitable rooms without and natural ventilation such as
a window which can be opened. The regulations state the fan should
operate for 15 mins. IMHO the regulations for rooms with windows or
passive stack ventilations do not require the time delay on the fan.
I guess that most new builds just fit the fan as it is delivered and
you get whatever the factory time delay is set too. Hope this
provides some help

--- In ukha_d@y..., "Ian Lowe" <ian@w...> wrote:
> Given that one of my first mods to the house electrics was to rip
the
> goddamn, irrititaing SOB of a fan off of the bathroom wall
> (in a fit of decorating, I put it bac, but not until I had snipped
the power
> supply)
>
> I wonder, whats the views of the group on having a fan which comes
on
> whenever the bathroom light does, even in the dead of night,
> and then whines away for another ten minutes or so, whilst you lie
in bed
> tying to get back to sleep after a quick trip to the loo?
>
> I mean, why?
>
> Do wiring regs people have an unusually acute sense of smell?? or
do they
> just like annoying people?
>
> Ian.
>   -----Original Message-----
>   From: Keith Doxey [mailto:lists.diyha@xxxxxxx...]
>   Sent: 24 February 2002 22:29
>   To: ukha_d@y...
>   Subject: RE: [ukha_d] LD10 with bathroom light and automatic fan
>
>
>   Hi Bazza,
>
>   I was pondering this a few minutes ago whilst laying in the bath.
>
>   The fan has a permanent live feed which is used for the overrun.
I believe
> the timer input is only used as a trigger. I know that with my fan,
it takes
> a few seconds to start as if a capacitor is being charged.
>
>   If the light is turned on for only a few seconds it can be
switched off
> and the fan will never start.
>
>   If the light is turned off immeadiately the fan starts it will
only run
> for a few seconds, and longer than this and it does its normal
setting.
>
>    Based on the above I believe the following may happen.
>
>   1. No enough to trigger the fan below a certain dim level.
>   2. It may take longer for the fan to start and overrun may not be
quite as
> long.
>   3. It works perfectly
>
>   I doubt that any damage would be caused to the fan but the only
way to
> prove it is to try.....at your own risk of course.
>
>   Unfortunately I cant test my theory..... I lay in the bath
working out how
> I could attempt to modify the switch to provide momentary
operation.....
> worked out that by removing the ceiling speaker I could place the
LD10 next
> to the transformer in the ceiling void (forward planning in case of
> transformer failure).... then realised the flaw in my plan :-(
>
>   I cant get to the junction box in the ceiling where the switch
wire is fed
> from. BUGGER !!!!
>   The reason for the ceiling speakers (apart from Audio in the
bathroom) is
> that the bathroom is a flat roofed extension and when I fitted the
low
> voltage lighting I realised thet the transformer could fail one day
so it
> needed to be accessable. The ceiling speakers are easily removable
to gain
> access for replacement. Unfortunately the junction box is screwed
to a joint
> about 30 inches further across the ceiling :-(
>
>   Also just disassembled the fan and greased the bearing because it
was
> squealing. I would buy a new one but mine is about 15 years old and
about 6"
> x 8". All the new ones are 6" square. Guess who decided it
would be
good to
> tile the wall all the way to the ceiling :-(
>
>   Keith
>     -----Original Message-----
>     From: Bazza [mailto:bazza2000@xxxxxxx...]
>     Sent: 24 February 2002 20:09
>     To: ukha_d@y...
>     Subject: [ukha_d] LD10 with bathroom light and automatic fan
>
>
>     Hi,
>
>     Can anyone give me any information on which module to
>     use (i.e. LD10 or AD10 DIN) on a bathroom light that
>     is connected to an automatic fan.
>     I'm not too sure if will be safe to use an LD10 with
>     DIM on an appliance such as a bathroom fan unit.
>     I believe the configuration is such that when the
>     bathroom light is switched off, the fan runs for a
>     further few minutes depending on its charge from the
>     during of the light being on.
>     I believe this is quite common in a lot of new houses
>     nowadays.
>
>     Many thanks,
>
>     Bazza.
>
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