Adjustment; Program The Travel Limits - Chamberlain 3850 Owner's Manual

ADJUSTMENT STEP 1

Program the Travel Limits

Travel limits regulate the points at which the door will stop
when moving up or down.
Figure 1
Cover
Protection Bolt
2-4"
(5-10 cm)
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 flashing
slowly, then release (Figure 2).
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 (Figure 3).
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.
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
LED
MUST be tested. Door MUST reverse on contact with
1-1/2" (3.8 cm) high object (or 2x4 laid flat) on floor.
Black Button
Purple Button
To prevent damage to vehicles, be sure fully open door
provides adequate clearance.
Figure 2
LED
Figure 3
Figure 4
LED
23
BLACK
Push and hold
until the door
is at desired UP
position
PURPLE
or
BLACK
Push either
button to stop
door at desired
DOWN position
PURPLE
T
L IG H
K
L O C