Re: Garage Door Opener keypad recommendations

[JoeRaisin <joeraisin2001@xxxxxxxxx>]

On 11/19/2010 12:24 PM, Jim wrote:
> On Nov 17, 7:03 pm, JoeRaisin<joeraisin2...@xxxxxxxxx>  wrote:
>> On 11/17/2010 5:47 PM, Jim wrote:
>>
>>
>>
>>
>>
>>> On Nov 17, 8:06 am, tourman<robercampb...@xxxxxxxxx>    wrote:
>>>> On Nov 17, 6:21 am, 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 with
>>>>>> 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 for
>>>>>> 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 challenge.
>>
>>>>>> 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. :-)
>>
>> 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.

I agree with you on rollerballs.  I swear I've seen friggin painters cut
around a recessed switches and paint right over the roller 'disc" switch
in doors in the same house.  Then, of course, they close the door to let
the paint dry...