Force Adjustments - Chamberlain 1120E-1/2HP Owner's Manual

ADJUSTMENT STEP 2
Adjust Force
Force Adjustment Controls are located on the back
panel of opener. Force adjustment settings regulate
amount of the power required to open and close the
door.
The door STOPS in the UP direction if anything
interferes with its travel. Door REVERSES in the
DOWN direction if anything interferes with its travel
(including binding or unbalanced doors).
If the force adjustments are set too light, door travel
may be interrupted by nuisances reversals in
DOWN direction and stops in UP direction. Weather
conditions can affect the door movement, so
occasional adjustment may be needed.
Maximum force adjustment range is 260 degrees,
about 3/4 of a complete turn. Do not force controls
beyond that point. Turn force adjustment controls
with a screwdriver.
9
1
7
3
5
KG
Adjustment Label
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 one-inch
obstruction. See page 25. If the door is hard to hold
or doesn't reverse, decrease the DOWN (close)
force by turning the control counterclockwise.
Make 10 degree turn adjustments until the door
reverses normally. After each adjustment, run the
opener through a complete cycle.
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 10 degree turn adjustments until the door
stops easily. After each adjustment, run the opener
through a complete travel cycle.
9
1
7
3
5
KG
How and When to Adjust the Forces
24
Too much force on the door will interfere
with the proper operation of the safety
reverse system. The door might not
reverse properly when required and could seriously
injure or kill someone under it. Do not increase the
force beyond the minimum amount required to close
the door. Do not use the force adjustments to
compensate for a binding or sticking garage door.
Test the safety reverse system following all
adjustments to force levels. See page 25.
Back Panel
of Opener
If the door doesn't open at least 1.5M
Increase UP (Open) force by turning the control
clockwise. Make 10 degree turn adjustments until
door opens completely. Re-adjust the UP limit if
necessary. After each adjustment, run the opener
through a complete travel 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 10 degree turn 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.
Force
Adjustment
Controls
1 2 3
9 1 9 1
7 3 7 3
5 5
KG KG