Adjust The Force - LiftMaster ATS2113X 1/2 HP Manuel D'installation

ADJUSTMENT STEP 2

Adjust the Force

Force adjustment controls are located on the back panel of the
motor unit. Force adjustment settings regulate the amount of
power required to open and close the door.
If the forces are set too light, door travel may be interrupted
by nuisance reversals in the down direction and stops in
the up direction. Weather conditions can affect the door
movement, so occasional adjustment may be needed.
The maximum force adjustment range is about 3/4 of a
complete turn. Do not force controls beyond that point. Turn
force adjustment controls with a screwdriver.
NOTE:
If anything interferes with the door's upward travel,
it will stop. If anything interferes with the door's downward
travel (including binding or unbalanced doors), it will reverse.
HOW AND WHEN TO ADJUST THE FORCES
1. 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 1-1/2" (3.8 cm) obstruction. See
Adjustment Step 3, page 23. If the door is hard to hold
or doesn't reverse, DECREASE the DOWN (close) force
by turning the control counterclockwise. Make small
adjustments until the door reverses normally. After each
adjustment, run the operator through a complete cycle.
• If the door reverses during the down (close) cycle and
the operator lights aren't fl ashing, INCREASE DOWN
(close) force by turning the control clockwise. Make
small adjustments until the door completes a close
cycle. After each adjustment, run the operator through a
complete travel cycle. Do not increase the force beyond
the minimum amount required to close the door.
2. 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 small adjustments until the door stops easily and
opens fully. After each adjustment, run the operator
through a complete travel cycle.
• If the door doesn't open at least 5 feet (1.5 m),
INCREASE UP (open) force by turning the control
clockwise. Make small adjustments until door opens
completely. Readjust the UP limit if necessary. After
each adjustment, run the operator through a complete
travel cycle.
Without a properly installed safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing door.
• Too much force on door will interfere with proper
operation of safety reversal system.
• NEVER increase force beyond minimum amount
required to close door.
• NEVER use force adjustments to compensate for a
binding or sticking door.
• 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" high (3.8 cm) object (or 2x4 laid
fl at) on fl oor.
Back Panel of Operator
22
Force Adjustment Controls
Adjustment Label