Chamberlain 41A2817 Manual De Instrucciones página 4

Without a properly installed safety reversal system, persons (particularly
small children) could be SERIOUSLY INJURED or KILLED by a closing
garage door.
• Incorrect adjustment of garage door travel limits will interfere with
proper operation of safety reversal system.
• Too much force on garage door will interfere with proper operation of
safety reversal system.
• NEVER increase force beyond minimum amount required to close
garage door.
• NEVER use force adjustments to compensate for a binding or sticking
garage door.
• If one control (force or travel limits) is adjusted, the other control may
also need adjustment.
• After ANY adjustments are made, the safety reversal system MUST be
tested. Door MUST reverse on contact with 1-1/2" high (3.8 cm)
object (or 2x4 laid flat) on floor.
To prevent damage to vehicles, be sure fully open door provides
adequate clearance.
Limit Adjustment Screws
Vis de réglage de fin de course
Tornillos de regulación de recorrido
Force Adjustment Controls
Commandes de réglage de force
Controles de regulación de fuerza
Adjustments
TYPE 1 - Garage door opener with a limit switch assembly
_ Run the opener through a complete travel cycle.
_ Does the door open and close completely?
_ Does the door stay closed and not reverse unintentionally when fully
closed?
If you answered "No" to either of the above questions, read "When to adjust
the Limits" and "When to Adjust the Forces".
If your door passes both of these tests, no limit/force adjustments are
necessary please proceed to "Testing the Safety Reverse System".
When to Adjust the Limits:
• If the door does not open completely but opens at least five feet
(1.5 m):
Increase up travel. Turn the UP limit adjustment screw clockwise. One turn
equals 2" (5 cm) of travel for 1/2 HP, 1/3 HP and 1/4 HP opener. One turn
equals 3" (7.5 cm) of travel for 3/4 HP opener.
NOTE: To prevent the trolley from hitting the cover protection bolt, keep a
minimum distance of 2-4" (5-10 cm) between the trolley and the bolt.
• If door does not open at least 5 feet (1.5 m):
Adjust the UP (open) force as explained above.
• If the door does not close completely:
Increase down travel. Turn the down limit adjustment screw
counterclockwise. One turn equals 2" (5 cm) of travel for 1/2 hp, 1/3 hp
and 1/4 hp opener. One turn equals 3" (7.5 cm) of travel for 3/4 hp opener.
If door still won't close completely and the trolley bumps into the pulley
protection bolt, try lengthening the door arm and decreasing the down
limit.
• If the opener reverses in fully closed position:
Decrease down travel. Turn the down limit adjustment screw clockwise.
One turn equals 2" (5 cm) of travel for 1/2 HP, 1/3 HP and 1/4 HP opener.
One turn equals 3" (7.5 cm) of travel for 3/4 HP opener.
• If the door reverses when closing and there is no visible interference to
travel cycle:
If the opener lights are flashing, the safety reversing sensors are either not
installed, misaligned, or obstructed.
When to Adjust the Force:
Test the DOWN (CLOSE) force
• Grasp the door bottom when the door is about halfway through DOWN
(close) travel. The door should reverse. Reversal halfway through down
travel does not guarantee reversal on a 1-1/2" (3.8 cm) obstruction. Refer
to the owner's manual.
• If the door is hard to hold or doesn't reverse, decrease the DOWN (close)
force by turning the control counterclockwise. Make small adjustments
until the door reverses normally. After each adjustment, run the opener
through a complete cycle.
• If the door reverses during the down (close) cycle and the opener lights
aren't flashing, increase DOWN (close) force by turning the control
clockwise. Make small adjustments until the door completes a close cycle.
After each adjustment, run the opener through a complete travel cycle. Do
not increase the force beyond the minimum amount required to close the
door.
Test the UP (OPEN) force
• Grasp the door bottom when the door is about halfway through UP (open)
travel. The door should stop. If the door is hard to hold or doesn't stop,
decrease UP (open) force by turning the control counterclockwise. Make
small adjustments until the door stops easily and opens fully. After each
adjustment, run the opener through a complete travel cycle.
• If the door doesn't open at least 5 feet (1.5 m), Increase UP (open) force
by turning the control clockwise. Make small adjustments until door opens
completely. Readjust the UP limit if necessary. After each adjustment, run
the opener through a complete travel cycle.
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