Chamberlain WHISPER DRIVE 248754 - Manual (Page 29)

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Without a properly installed safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door.
• Incorrect adjustment of garage door travel limits
will interfere with proper operation of safety
reversal system.
• NEVER use force adjustments to compensate for a
binding or sticking garage door.
• After ANY adjustments are made, the safety reversal
system MUST be tested. Door MUST reverse on
contact with 1-1/2" (3.8 cm) high object (or 2x4 laid
fl at) on fl oor.
To prevent damage to vehicles, be sure fully open
door provides adequate clearance.
ADJUSTMENT STEP 1
Program the Travel Limits
Travel limits regulate the points at which the door will
stop when moving up or down.
Adjust the position of the door by using the black and
purple buttons. Black moves the door UP (open) and
purple moves the door DOWN (close).
Setting the UP position:
1. Press and hold the black button until the LED starts
fl ashing slowly, then release.
2. Push and hold the black button until the door reaches
the desired UP (open) position.
NOTE: Make sure the door opens high enough for your
vehicle.
3. Push the door control or programmed remote control.
This sets the UP (open) limit and begins closing the
door.
4. Immediately when the door begins to close, press and
release either the black or purple button. This will stop
the door.
Setting the DOWN position:
5. Push and hold the purple button until the door reaches
the desired DOWN (closed) position.
6. Once the door is closed, if there appears to be too
much pressure on the door, you may toggle the door
back and forth using the black and purple buttons to
reach the desired closed position.
7. Push the door control or programmed remote control.
This sets the DOWN (close) limit and the door should
open.
Proceed to Set the Force.
Black Button
LED
Purple Button
Figure 1
Figure 4
Figure 3
OR
Figure 2
LED
LED
Push and hold
until the door
is at desired UP
position
Push either
button to stop
door at desired
DOWN position