Adjustment Section - Chamberlain Merlin Whisper Drive MT3850 Installation And Operating Instructions Manual

ADJUSTMENT STEP 1
Program the Travel Limits
NOTE: Travel limits regulate the points at which the
door will stop when moving up or down. Follow the
steps below to set the limits.
Figure 1
To program the travel limits:
Adjust the position of the door by using the black and
orange buttons. Black moves the door UP (open) and
orange moves the door DOWN (close).
1. Setting the UP position: Press and hold the black
button until the orange indicator light starts flashing
slowly then release.
2. Push and hold the black button until the door reaches
the desired UP (open) position (Figure 2).
NOTE: Check to be sure the door opens high enough
for your vehicle.
3. Push the remote control or door control (Figure 3).
This sets the UP (open) limit and begins closing the
door.
4. Immediately the door starts to move down, press and
release either the black or orange button. This will stop
the door.
5. Setting the DOWN position: Push and hold the
orange button until the door reaches the desired
DOWN (closed) position (Figure 4).
6. Once the door is closed, if there appears to have too
much pressure on the door, you may adjust the door
up and down using the black and orange buttons to
reach the desired closed position.
7. Push the remote control or the door control (Figure 5).
This sets the DOWN (close) limit and should bring the
door to the open position.
• When the opener stops in both the desired up (open)
and down (close) positions.
NOTE: Proceed to Adjustment Step 2, Setting the
Force even if the door reverses just before the
open position.
• NEVER use force adjustments to compensate for a binding or
• After ANY adjustments are made, the safety reversal system
To prevent damage to vehicles, be sure fully open door provides
adequate clearance.
Indicator Light
Black Button
Orange Button
Figure 2
Figure 3
Figure 4
Figure 5
20
sticking garage door.
MUST be tested. Door MUST reverse on contact with 40mm high
object laid flat on floor.
Indicator Light
BLACK
ORANGE
Indicator Light
BLACK
ORANGE
Push and hold
until the door
is at desired UP
position
or
Push either
button to stop
door at desired
DOWN position
or