Chamberlain 1156- 1/2HP EN - Manual (Page 4)

ADJUSTMENT STEP 2
Adjust Force
DO NOT USE FORCE ADJUSTMENTS TO
COMPENSATE FOR A BINDING OR
STICKING GARAGE DOOR EXCESSIVE
FORCE WILL INTERFERE WITH THE PROPER
OPERATION OF THE SAFETY REVERSE SYSTEM OR
DAMAGE THE GARAGE DOOR.
Force Adjustment Controls are located on rear panel of
opener. FORCE ADJUSTMENT settings regulate amount
of the power required to open and close door.
NOTE: 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 nuisance 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.
Adjustment Label
FORCE ADJUSTMENT CHART
TEST DOWN (CLOSE) FORCE
Grasp the door handle or door bottom when door is about
halfway through DOWN (CLOSE) TRAVEL. Door should
reverse. If the door is hard to hold or doesn't
reverse,decrease
DOWN (CLOSE) FORCE by turning the
control in a counterclockwise direction. Make 10 degree
turn adjustments until door reverses normally. After each
adjustment, run opener through a complete cycle.
PROCEED TO STEP 3
IF DOOR DOESN'T OPEN AT LEAST 5 FEET
Increase UP (OPEN) FORCE by turning the control in a
clockwise direction. Make 10 degree turn adjustments until
door opens completely.Readjust UP LIMIT if necessary.
After each adjustment, run opener through a complete
travel cycle.
IF DOOR REVERSES DURING DOWN
(CLOSE) CYCLE
Increase DOWN (CLOSE) FORCE by turning control
clockwise. Make 10 degree turn adjustments until door
completes close cycle. After each adjustment, run the
opener through a complete travel cycle.
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