Chamberlain 985 - Manual (Page 4)

Safety
Reversing
Sensor
Slack in chain tension
is normal when
garage door is closed
Header
Wall
Safety
Reversing
Sensor
Access Door
FINISHED CEILING
Support bracket
& fastening
hardware is required.
See page 13.
Gap between floor
and bottom of door
must not exceed 1/4".
Access
Door
Floor must be level
across width of door Safety
Reversing Sensor
Safety
Reversing Sensor
Slack in chain tension
is normal when
garage door is closed.
4
Safety Reversing Sensor
Horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, steel, aluminum,
door with glass panels, etc.).
See page 20 for details.
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 13. Slack in Chain Tension
is Normal When
Garage Door is Closed
— — — — — — — —
Door Center
Header Wall
Safety
Reversing
Sensor
Floor must be level
across width of door
Extension Spring
Torsion Spring
Access Door
OR
Before you begin, survey your garage area to see whether any of the conditions below apply to your installation.
You may find it helpful to refer back to this page as you proceed with the installation of your opener.
Sectional Door Installation
One-Piece Door Installation without Track
Model 1702 Outside Quick Release
required if there is no access door.
One-Piece Door with Track