RE: Alarm contacts in PVC windows

[Jean-Stéfane Bergeron <j.s.bergeron@xxxxxxx>]

Hi Des,

Comments in-line >

> -----Original Message-----
> From: Des Gibbons [mailto:des@xxxxxxx] 
> Sent: January 20, 2003 13:06
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Alarm contacts in PVC windows
> 
> 
> 
> 
> Hi Jean-Stefane,
> 
> 
> > Here is my experience -
> >
> > When we built our house about 5 years ago, virtually all 
> windows are 
> > PVC slider in a frame. I mounted the switch/sensor part of 
> the contact 
> > in the fixed frame "sill" about 9 inches from the
corner. I then 
> > placed two "low profile" magnets in the frame of the
double glazed 
> > window using a jig.
> 
> I don't suppose there is any chance you could send me a photo 
> of the magnets in the frame?

Should be able to grab a picture and I'll send it to you. Give a couple
of days.

> 
> >
> > The magnet is only about 1/2" long and fit within the frame
of the 
> > window without getting too close to the glass assembly. I 
> used a jig 
> > so I could make sure I did not drill too deeply in the 
> frame so as not 
> > to break the seal of the double glazed glass assembly. It 
> also ensured 
> > that the magnets would always be in the right location (this is
> > important as the smaller magnets have a lower "gap"
tolerance).
> 
> Did you feed the cable out thru the fixed frame directly into 
> the wall?

Yes, to mount the switch, you drill a hole large enough to mount the
switch assembly in, with the leads leading into the wall. I then had
wired a homerun to each window to connect the system. Everything is
within the wall. (I did that during the framing stage when the walls
had
not been completed)

> 
> >
> > As an added bonus, using two magnets allows me to alarm the
window 
> > when it is closed or partially opened (6") for ventilation.
Anyone 
> > opening the window further would trigger the alarm.
> 
> Now that sounds great!
> 
> >
> > The key here is to contact the manufacturer of the windows and
make 
> > sure you know how much space there is between the outside 
> of the frame 
> > and the seal of the glass assembly. This took a bit of work 
> but in my 
> > case they finally gave me some drawings so I could figure 
> it out. Gave 
> > myself some room for error (there's mostly) and built a 
> jig. It worked 
> > very well.
> 
> OK, I will go get some flush contacts and get some 
> measurements from the window supplier. Glad to hear that 
> someone else had success :)
> >
> > If you want more info, let me know. Hope this helps.
> 

As suggested, if you can get a cross section, it would let you get a
good look into the window frame - maybe even try your hand at it before
the real thing. You will also want to make sure you select the right
location in the fixed frame "track" and window frame to make sure
they
line up (obviously) but are also have an acceptable gap.

> It helps a lot, thanks for the info!
> 

Glad to help !

> Cheers, Des.
> 
> 
http://www.automatedhome.co.uk
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