Adjustment - Chamberlain 8550 Manual

Adjustments
2
Test the Safety Reversal System
Without a properly installed safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing
garage door.
• Safety reversal system MUST be tested every
month.
• 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 the floor.
3
Test the Protector System
Without a properly installed safety reversing
sensor, persons (particularly small children) could
be SERIOUSLY INJURED or KILLED by a closing
garage door.
2.1
With the door fully open, place a 1-1/2
inch (3.8 cm) board (or a 2x4 laid flat) on
the floor, centered under the garage
door.
3.1
Open the door. Place the garage door
opener carton in the path of the door.
2.2
Press the remote control push button to
close the door. The door MUST reverse
when it makes contact with the board.
3.2
Press the remote control push button to
close the door. The door will not move
more than an inch (2.5 cm), and the
garage door opener lights will flash 10
times.
25
If the door stops and does not reverse on
the obstruction, the travel need to be
adjusted (refer to Adjustment Step 1).
Repeat the test. When the door reverses
upon contact with the 1-1/2 inch board,
remove the board and open/close the
door 3 or 4 times to test the adjustment.
If the test continues to fail, call a trained
door systems technician.
The garage door opener will not close
from a remote control if the LED in either
safety reversing sensor is off (alerting you
to the fact that the sensor is misaligned or
obstructed).
If the garage door opener closes the door
when the safety reversing sensor is
obstructed (and the sensors are no more
than 6 inches [15 cm] above the floor), call
for a trained door systems technician.