Garage Door Openers

Having a garage door opener is becoming so standard, that I rarely see a garage door without it. However, because it is a technical device, and if improperly installed, combined with a 400 pounds garage door (give or take some), it will hurt you badly! It might even kill you! There's a well known phrase - "when it works, don't touch it" (or fix it) - but maybe there must be also a different one put into it "if it had been properly installed"...
Many of us hate instructions but please stick with me till the conclusion of this information - it might be good for you, particularly if your garage door opener has been installed by some other person, it is old, or you aren't sure if everything you did with it is really safe.
There are numerous several types of garage door openers and this is simply not analysis them. 
This really is about safety futures that MANY people (homeowners / installers) neglect to install properly. 
The Consumer Product Safety Commission (CPSC) requires that all garage door openers manufactured or imported after January 1, 1993, available in the United States are equipped with an external entrapment protection system. Additionally, it recommends, that any garage door openers with out a such safety future should replaced. External entrapment protection system describes either:
A power eye - two photoelectric sensors installed on both sides of the garage door track - they will never be installed higher than six inches from the garage floor (4"-6" could be the recommended location). Such installation ensures that a small child cannot crawl underneath the sensor's invisible beam. When the light beam is broken during the door closing process, the door should stop and reverse. If there's anything on the sensor light beam path or both sensors are out of alignment, you'll still be able to close the door by holding the wall button - correct the problem as opposed to forcing the door to close. I've seen so many garages used as storage where it is impossible to see the reduced section of the garage door from the location the push button has been installed, so you may not know what's blocking the light beam. Believe it or not but I often see two sensors taped together and secured above the garage door opener ... or installed very high on both sides of the garage overhead doors opening. Remember - safety sensors must certanly be installed within 6" from the garage floor level to avoid young children from crawling within the light beam - having them on the ceiling is just seeking a accident to happen.
A door edge sensor - commonly applied to elevator doors, but additionally in certain residential garage door openers - it's a strip installed along the bottom edge of the door. When it detects pressure applied by any obstruction, it will stop and reverse the door.
The garage door opener reverse on obstruction future must certanly be set properly.Just in case this is the only safety future (no door edge sensor or photoelectric eye) - it becomes critical. It can also be critical in situations where a power eye has been improperly mounted (too high or in a different location - like on the pictures above). There ought to be a few adjustment screws on the body of the garage door opener assembly, usually marked "down force" & "up force" or "open force" & "close force" (just like on the picture). Make certain, that you're adjusting the appropriate group of screws, because many models of garage door openers may also have "up / down travel" adjustments - read the label. Always follow manufacturers instructions when doing adjustment, if the paperwork is gone, look it down online for that one model. The typical rule is to put a 2"x4" block of wood underneath the door and attempt to close it. The garage door opener down / up force must certanly be adjusted in such way, that whenever the door bottom edge touches the obstruction, it will immediately reverse. Some recommend using paper towels rolls as opposed to a wooden block, because it has an occurrence just like the human body, and especially small children. If you will get the garage door opener sensitivity adjustment that close, it would be perfect!

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