Operation Of Your Opener - Chamberlain 1255GM Owner's Manual

Activate the opener with any of the following
devices:
• The Remote Control Transmitter. Hold push
button down until the door starts to move.
• The Door Control. Hold button down until the
door starts to move.
• The Outside Keylock or Keyless Entry.
(See Accessories.)
When the opener is activated with the Safety
Reversing Sensor installed and correctly aligned:
1. If open, the door will close. If closed, the door will
open.
2. If closing, the door will reverse.
3. If opening, the door will stop (allowing space for
entry and exit of pets and for fresh air).
4. If the door has been stopped in a partially open
position, it will close.
5. If obstructed while closing, the door will reverse.
6. If obstructed while opening, the door will stop.
7. The garage door will reverse in the closing cycle
when the invisible beam is broken. If fully open, the
door will not close when the beam is broken. The
sensor has no effect in the opening cycle.
If the sensor is not installed, or is not aligned
correctly, the door won't close from any remote
control transmitter. You can close the door with the
Door Control, the Outside Keylock, or Keyless Entry,
however, if you activate them until down travel is
complete. If you release them too soon, the door will
reverse.
The opener lights will blink for 5 seconds when the
safety reversing sensor causes the door to reverse.
The Opener Light will turn on under the following
conditions: When the opener is initially plugged in;
when the power is interrupted; when the opener is
activated. It will turn off automatically after 4-1/2
minute. Bulb size is 75 watts maximum.
Operation of the
Lighted Door Control Button
Press to open or close the door.
Press again to reverse the door during the closing
cycle or to stop the door while it's opening.

Operation of Your Opener

28
Weak or broken springs could allow an open
door to fall (either rapidly or unexpectedly),
resulting in serious injury, death or property
damage. If possible, use the manual release
rope and handle only when the door is fully
closed.
Trolley
Release Arm
Trolley
Manual Release
Handle (Pull Down)
Manual disconnect
position
The lockout feature
prevents the trolley from
reconnecting auto-
matically. Pull the red
manual release handle
down and back (toward
the opener). The door
can then be raised and
lowered manually as
often as necessary. To
disengage the Lockout
Feature, pull the manual
handle straight down.
The trolley will reconnect
on the next UP or DOWN
operation.
WARNING
To open the door
manually:
The door should be fully
closed if possible. Pull
down on the red manual
release handle and lift
the door manually. To
reconnect the door to the
opener, press the Door
Control button.
Trolley
Release Arm
Trolley
Manual Release Handle
(Pull Down & Back
Towards Opener)
Lockout position