Re: Garage Door Opener keypad recommendations

[Jim <alarminex@xxxxxxx>]

On Nov 17, 8:06=A0am, tourman <robercampb...@xxxxxxxxx> wrote:
> On Nov 17, 6:21=A0am, JoeRaisin <joeraisin2...@xxxxxxxxx> wrote:
>
>
>
>
>
> > On 11/16/2010 7:57 PM, Christopher Glaeser wrote:
>
> > >> One of my trades is (was) overhead door installation.
>
> > > Fair enough. I called the company that installed the garage doors in =
our
> > > neighborhood. They are among the major garage door compainies in
> > > northern california. I told him about my experience with a broken
> > > spring, and asked him if the motor should be able to open the door wi=
th
> > > a broken spring. He said no way. He went on to explain that some
> > > contractors use 1/3 HP for the heavy doublewides because the spring d=
oes
> > > all the heavy lifting, but they don't recommend the smaller motors fo=
r
> > > the heavy doors. However, he said that even the 3/4 HP motors can't o=
pen
> > > a heavy doublewide with a broken spring.
>
> > >> Now in addition to a power failure, a battery failure, and a stormy
> > >> night when
> > >> you come home.... You're going to throw in a broken spring at that e=
xact
> > >> moment.? Talk about entropy. Hell, if all that goes wrong then that'=
s
> > >> some
> > >> kind of mojo warning you not to go in.
>
> > > I'm not sure you understand the scenario I'm describing. I'm talking
> > > about a single point of failure. I know many people (myself included)
> > > who do not carry any house keys. The only way for them to gain entry =
to
> > > their house (without a break in), is through the garage door. If the
> > > garage spring breaks while they are outside the house, and they have =
a
> > > heavy garage door, then gaining entry to the house may present a chal=
lenge.
>
> > > Best,
> > > Christopher
>
> > Are you saying that you leave the door from the garage to the house
> > unlocked?
>
> RHC: Good question ! This is a very poor idea and an ongoing source of
> false alarms. If the door doesn't close properly and isn't locked,
> high winds outside can cause enough of a vacuum inside the garage to
> pull or push the door open just enough to trigger the zone (especially
> with magnetic contacts versus roller balls behind the door) . This is
> a common cause of false alarms that I routinely warn my clients about.-

Ummmm what kind of "roller ball" would you use on an overhead door?

I can see a 2" gap magnetic switch but a roller ball?  Well, maybe if
it was about  6 inches in diameter to give you the two inches of play.
I think the door would have a hard time trying to push in a ball that
size and the kids would constanly be leaning their bicycles against
it. :-)