Chamberlain LiftMaster PROFESSIONAL SECURITY+ 3800C Mode D'emploi page 18

ADJUSTMENT STEP 2
Setting the Force
The force setting button is located on the front panel.
The force setting measures the amount of force
required to open and close the door.
1. Locate the purple button on the unit (Figure 1).
2. Push the purple button twice to enter unit into Force
Adjustment Mode (Figure 2). The LED (Indicator Light)
will flash quickly.
3. Push the remote control or control console (Figure 3).
The door will travel to the DOWN (close) position.
Push the remote control or control console again, the
door will travel to the UP (open) position. Push the
remote control or control console a third time to send
the door to the DOWN (close) position.
The LED (Indicator Light) will stop flashing when the
force has been learned.
The unit has learned the forces required to open and
close your door.
The door must travel through a complete cycle, UP and
DOWN, in order for the force to be set properly. If the
unit cannot open and close your door fully, inspect your
door to insure that it is balanced properly and is not
sticking or binding. See page 4, "Preparing your
garage door."
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18
WARNING
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLY INJURED
CAUTION
or KILLED by a closing garage door.
• NEVER learn forces or limits when door is binding or
sticking. Repair door first
• Too much force on garage door will interfere with proper
operation of safety reversal system.
• 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.
Figure 1
Indicator
Black
Light
Button
Purple
Button
Figure 3
Figure 2
BLACK
Push Purple button
twice to enter
unit into Force
Adjustment Mode
PURPLE
or