Adjustment; Adjust The Up And Down Travellimits - Chamberlain Whisper Drive Security+ 248739 Owner's Manual

ADJUSTMENT STEP 1
Adjust the UP and DOWN TravelLimits
Limit adiustment settings regulate the points at which the
door wilt stop when moving up or down.
To operate the opener, press the Door Control push bar.
Run the opener through a complete travet cycle.
. Does the door open and close completely?
o Does the door stay closed and not reverse
unintentionally when fully closed?
it your door passes both of these tests, no limit
adjustments are necessary unfess the reversing test fails
(Adjustment Step 3, page 30).
Adjustment procedures are outlined below. Read the
procedures carefully before proceeding to Adjustment
Step 2. Use a screwdriver to make limit adjustments, Bun
the opener through a complete travel cycle after each
adjustment.
NOTE:Repeatedoperation of the opener during adjustment
procedures may cause the motor to overheat and shut off.
Simply wait !5 minutes and try again, If anything interferes
with the door's upward travel, it wilt stop. If anything
interferes with the door's downward travel (including
binding or unbalanced doors), it win reverse.
HOW AND WHEN TO ADJUST THE LIMITS
• If the doordoesnot open completely but opens at
least live feet (1.5 m):
increase up travel. Turn the UP fimit adjustment screw
clockwise. One turn equals 2" (5 cm) of travel.
NOTE: To prevent the trolley from hitting the cover
protection bolt, keep a minimum distance of
2-4" (5 cm - 10 cm) between the trolley and the bolt.
• If door doesnot open at least 5 feet (1.5 m):
Adjust the UP (open) force as explained in
Adjustment Step 2.
• If the door doesnot close completely:
Increase down travel Turn the down limit adjustment
screw counterclockwise. One turn equals 2" (5 cm) of
travel.
If door still won't close completely and the trolley
bumps into the puiley bracket (page 4), try lengthening
the door arm (page 26) and decreasing the down limit,
o If the openerreverses in fully closed position:
Decrease down travel. Turn the down limit adjustment
screw clockwise. One turn equats 2" (5 cm) of travel.
Without a properly installed safety reversal system,
persons (particularly smali children) could be
SERIOUSLYiNJURED or KILLED bya closing garage
door.
• Incorrect adjustment of garage door travel limits
will interfere with proper operation ol safety
reversal system,
• If one control (force or travel limits) is adiusted, the
other control may also needadjustment.
• After ANY adjustments are made, the safety
reversal system MUST be tested. Door MUST
reverseon contact with "_-1t2"high (3.8 cm) obiect
(or 2x4 laid fiat) on floor.
To prevent damage to vehicles, be sure fully open door
provides adequate clearance.
CoverProlectionBolt
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LeftPanel LimitAdiustmentScrews
ADJUSTMENT LABEL
It the doorreverses when closingand there is no
visible interference to travel cycle:
if the opener lights are flashing, the Safety Reversing
Sensors are either not installed, misaligned, or
obstructed. SeeTroubleshooting, page 23.
Test the door for binding: Putt the emergency retease
handle. Manually open and close the door. If the door is
binding or unbalanced, call for a trained door systems
technician. It the door is balanced and not binding,
adiust the DOWN (close) force. SeeAdjustment Step 2.
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