Chamberlain HD920EV Manual page 25

Install the Protector System
1 Install the Safety Reversing Sensors
OPTION C
FLOOR INSTALLATION
Use an extension bracket (not provided) or wood black to raise the sensor bracket if needed.
1.1C
Carefully measure the position of both
sensor brackets so they will be the same
distance from the wall and unobstructed.
2 Wire the Safety Reversing
Sensors
PRE-WIRED INSTALLATIONS: If your garage
already has wires installed for the safety
reversing sensors, proceed to page 26.
HARDWARE
Insulated Staple
®
1.2C
Attach the sensor brackets to the floor
using concrete anchors (not
provided).
(not provided)
OPTION A
INSTALLATION WITHOUT PRE-WIRING
2.1A
Run the wire from both sensors to the
garage door opener. Attach the wire to
the wall and ceiling with the staples.
Staple
1.3C
Slide the carriage bolt (H17)
into the slot on each sensor.
H17
2.2A
Strip 7/16 inch (11 mm) of
insulation from each set of
wires. Separate the wires. Twist
the white wires together. Twist
the white/black wires together.
7/16"
(11 mm)
25
1.4C
Insert the bolt through the hole in the sensor
bracket and attach with the wing nut (H18). The
lenses on both sensors should point toward
each other. Make sure the lens is not obstructed
by the sensor bracket.
H18
2.3A
Insert the white wires into the white terminal on
the garage door opener. Insert the white/black
wires into the grey terminal on the garage door
opener. To insert or remove the wires from the
terminal, push in the tab with a screwdriver tip.