Chamberlain 9902 - Manual (Page 7)

7
Safety Reversing Sensor
FINISHED CEILING
Support bracket
& fastening
hardware is required.
See page 20.
Safety Reversing Sensor
Header
Wall
Access Door
Gap between floor and bottom of
door must not exceed 1/4".
Closed Position
Header
Bracket Trolley
Straight
Door
Arm
Manual
Release
Rope & Handle
Door
Bracket
Curved
Door
Arm Header
Wall
Rail Assembly
Garage
Door
Rail
Bracket
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.
Based on your particular requirements, there are several
installation steps which might call for materials and/or
hardware not included in the carton.
• Step 1, page 13 – Look at the wall or ceiling above the
garage door. The header bracket must be securely
fastened to structural supports.
• Step 6, page 20 – Do you have a finished ceiling in your
garage? If so, a support bracket and additional fastening
hardware (not supplied) may be required.
• Safety reversing sensor, page 16 – Depending on garage
construction, extension brackets (see Accessories) or
wood blocks may be needed to fasten sensors to
mounting locations.
• Step 14, page 17 – Floor mounting of the safety reversing
sensor will require hardware that is not provided.
• Step 12, page 25 – Generally, a one-piece door does not
require reinforcement. If your door is lightweight, you
can refer to the information relating to sectional doors
on page 24.
• Step 12, page 25 – Depending on your door's
construction, you might need additional mounting
hardware for the door bracket.
• Do you have an access door in addition to the garage
door? If not, Model 7702CB Outside Quick Release is
required. See page 38.
• The gap between the bottom of the garage door and
the floor cannot exceed 1/4". Otherwise, the safety
reverse system may not work properly. See page 30.
The floor or the door should be repaired.
ONE-PIECE Door Installation
One-Piece Door without Track
Access
Door
Floor must be level
across width of door Safety
Reversing Sensor
Header
Bracket
Door
Bracket Straight
Door
Arm
Curved
Door Arm
Trolley
Manual Release
Rope & Handle
Rail Assembly
Garage
Door
Header
Wall
Safety
Reversing
Sensor
One-Piece Door With Track
Closed Position
Rail
Bracket