Chamberlain POWER DRIVE 7920KD Assembly & Installation Manual page 18

1
Assemble Safety Reversing Sensors
A17
Safety Reversing
Sensor C14
Carriage
Bolts
Mount Brackets: Mounting Options
2a
Floor installation (optional)
Attach with
concrete anchors
(not provided)
Sensor Beam
No Higher
Than 6" (15 cm)
Above Floor
NOTE: The safety reversing sensor must
be connected and aligned correctly before
the garage door opener will move in the
down direction.
INSTALL THE PROTECTOR SYSTEM
A17
Safety Reversing
Sensor
A10
Safety Sensor
C14
Bracket
Wing Nut
2b
Wall installation (optional)
OR
Sensor Beam
No Higher
Than 6" (15 cm)
Above Floor
ALL HARDWARE SHOWN ACTUAL SIZE
C14
Carriage Bolt
2
Mount Brackets
Garage door track installation (preferred)
Inside Garage Wall
Fasten 2x4 to
Wall with Lag
Screws (Not
Provided)
Lag Screws
(Not Provided)
Safety Reversing Sensors
MUST be aligned and no
higher than 6" (15 cm)
above floor
C16
Wing Nut
18
®
Door
Track
Lens
2c
Wall installation with Extension
Brackets (optional)
A9
Extension Bracket
OR
(Provided with
Extension Bracket)
Safety Reversing Sensors
MUST be aligned and no
higher than 6" (15 cm)
above floor
Indicator
Light
Sensor Beam
No Higher
Than 6" (15cm)
Above Floor
(Provided with
Extension Bracket)
Sensor Beam
No Higher Than
6" (15 cm)
Above Floor