Chamberlain LiftMaster PROFESSIONAL SECURITY+ 3500C Manuel Du Propriétaire page 26

ADJUSTMENT STEP 3
Test the Safety Reversal System
TEST
• With the door fully open, place a 1-1/2" (3.8 cm)
board (or a 2x4 laid flat) on the floor, centered
under the garage door.
• Operate the door in the down direction. The door
must reverse on striking the obstruction. Upon
successful safety reversal test proceed to
Adjustment Step 4.
ADJUST
• If the door stops on the obstruction, it is not
traveling far enough in the down direction.
Complete Adjustment Steps 1 and 2 Programming
the Limits and Forces.
NOTE: On a sectional door, make sure limit
adjustments do not force the door arm beyond a
straight up and down position. See Figure 3,
page 22.
• Repeat the test.
• When the door reverses on the 1-1/2" (3.8 cm)
board (or 2x4 laid flat), remove the obstruction and
run the opener through 3 or 4 complete travel
cycles to test adjustment.
• If the unit continues to fail the Safety Reverse Test,
call for a trained door systems technician.
IMPORTANT SAFETY CHECK:
Test the Safety Reverse System after:
• Each adjustment of door arm length, limits, or
force controls.
• Any repair to or adjustment of the garage door
(including springs and hardware).
• Any repair to or buckling of the garage floor.
• Any repair to or adjustment of the opener.
ADJUSTMENT STEP 4
Test The Protector System
• Press the remote control push button to open the
door.
• Place the opener carton in the path of the door.
• Press the remote control push button to close the
door. The door will not move more than an inch,
and the opener lights will flash.
The garage door opener will not close from a remote
if the indicator light in either sensor is off (alerting
you to the fact that the sensor is misaligned or
obstructed).
If the opener closes the door when the safety
reversing sensor is obstructed (and the sensors
are no more than 6" (15 cm) above the floor), call
for a trained door systems technician.
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.
• 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" (3.8 cm) high object (or 2x4 laid
flat) on the floor.
Without a properly installed safety reversing sensor,
®
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door.
Safety Reversing Sensor
26
WARNING
CAUTION
1-1/2" (3.8 cm) board
(or a 2x4 laid flat)
WARNING
CAUTION
Safety Reversing Sensor