Chamberlain B970 B353 B353C B550 B550C B750 B750C B751C B970 B970C B1381 B1381 - Page 13

Adjustments

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Adjustments For sectional door installations see Adjustments in the Installation Manual. Adjustments One-Piece Doors Only Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door. l Incorrect adjustment of garage door travel limits will interfere with proper operation of safety reversal system. l After ANY adjustments are made, the safety reversal system MUST be tested. Door MUST reverse on contact with 1-1/2" (3.8 cm) high object (or 2x4 laid flat) on floor. To prevent damage to vehicles, be sure fully open door provides adequate clearance. Your garage door opener is designed with electronic controls to make setup and adjustments easy. The adjustments allow you to program where the door will stop in the open (UP) and close (DOWN) position. The electronic controls sense the amount of force required to open and close the door. The force is adjusted automatically when you program the travel. NOTE: If anything interferes with the door's upward travel it will stop. If anything interferes with the door's downward travel, it will reverse. When setting the UP travel for a one-piece door ensure that the door does not slant backwards when fully open (UP). If the door is slanted backwards this will cause unnecessary bucking and/or jerking when the door is opening or closing. To continue, go to Adjustments step 1 in the Installation Manual 13 Correct Incorrect Open (UP) Close (DOWN)

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13
Adjustments
For sectional door installations see Adjustments in the Installation Manual.
Adjustments
One-Piece Doors Only
Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY
INJURED or KILLED by a closing garage door.
l
Incorrect adjustment of garage door travel limits will interfere with proper operation of safety reversal
system.
l
After ANY adjustments are made, the safety reversal system MUST be tested. Door MUST reverse on
contact with 1-1/2" (3.8 cm) high object (or 2x4 laid flat) on floor.
To prevent damage to vehicles, be sure fully open door provides adequate clearance.
Your garage door opener is designed with electronic controls to make setup and adjustments easy. The adjustments
allow you to program where the door will stop in the open (UP) and close (DOWN) position. The electronic controls
sense the amount of force required to open and close the door. The force is adjusted automatically when you program
the travel.
NOTE:
If anything interferes with the door’s upward travel it will stop. If anything interferes with the door’s downward
travel, it will reverse.
When setting the UP travel for a one-piece door ensure that the door does not slant backwards when fully open (UP).
If the door is slanted backwards this will cause unnecessary bucking and/or jerking when the door is opening or
closing.
To continue, go to Adjustments step 1 in the
Installation Manual
Open (UP)
Close (DOWN)
Correct
Incorrect