Re: Garage Door Opener keypad recommendations

[Jim <alarminex@xxxxxxx>]

On Nov 17, 7:03=A0pm, JoeRaisin <joeraisin2...@xxxxxxxxx> wrote:
> On 11/17/2010 5:47 PM, Jim wrote:
>
>
>
>
>
> > On Nov 17, 8:06 am, tourman<robercampb...@xxxxxxxxx> =A0wrote:
> >> On Nov 17, 6:21 am, JoeRaisin<joeraisin2...@xxxxxxxxx> =A0wrote:
>
> >>> 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 w=
ith
> >>>> 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 =
does
> >>>> all the heavy lifting, but they don't recommend the smaller motors f=
or
> >>>> the heavy doors. However, he said that even the 3/4 HP motors can't =
open
> >>>> 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 =
exact
> >>>>> 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 cha=
llenge.
>
> >>>> 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? =A0Well, maybe if
> > it was about =A06 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. :-)
>
> We were talking about the garage to house door.
>
> Though a six inch roller ball would be a sight to behold...-

Oh.

However. Unless I don't have any other choice I don't use roller ball
switches on doors. I think it's been pretty well documented that all
it takes is a grain of sand or a paint chip to jam a roller ball
switch in the closed position.