LiftMaster 8557 8557 Manual - Page 19

OPTION C FLOOR INSTALLATION, 2 Wire the Safety ReversingSensors

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Install the Protector System® 1 Install the Safety Reversing Sensors OPTION C FLOOR INSTALLATION Use an extension bracket (not provided) or wood block 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. 1.2C Attach the sensor brackets to the floor using concrete anchors (not provided). (not provided) IGWnsaairdlalege 1.3C Slide the carriage bolt into the slot on each sensor. Carriage Bolt 1/4" - 20 x 1/2" 1.4C Insert the bolt through the hole in the sensor bracket and attach with the wing nut. The lens on both sensors should point toward each other. Make sure the lens is not obstructed by the sensor bracket. Wing Nut 1/4" - 20 2 Wire the Safety Reversing Sensors OPTION A INSTALLATION WITHOUT PRE-WIRING PRE-WIRED INSTALLATIONS: If your garage 2.1A Run the wire from both sensors to the already has wires installed for the safety reversing garage door opener. Attach the wire to sensors, see page 20. the wall and ceiling with the staples. HARDWARE Staple 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. 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. RED WHITE WHITE GREY Insulated Staple (Not shown) 7/16" (11 mm) 19

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Install the Protector System
®
1 Install the Safety Reversing Sensors
OPTION
C
FLOOR INSTALLATION
Use an extension bracket (not provided) or wood block 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.
1.2C
Attach the sensor brackets to the floor
using concrete anchors (not
provided).
Inside
Garage
Wall
(not provided)
1.3C
Slide the carriage bolt into the slot on
each sensor.
Carriage Bolt
1/4" - 20 x 1/2"
1.4C
Insert the bolt through the hole in the sensor
bracket and attach with the wing nut. The lens
on both sensors should point toward each
other. Make sure the lens is not obstructed by
the sensor bracket.
Wing Nut
1/4" - 20
2 Wire the Safety Reversing
Sensors
OPTION
A
INSTALLATION WITHOUT PRE-WIRING
PRE-WIRED INSTALLATIONS:
If your garage
already has wires installed for the safety reversing
sensors,see page 20.
HARDWARE
Insulated Staple
(Not shown)
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
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)
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.
RED
WHITE
WHITE
GREY
D
RED
W
RE
WH
WHITE
GREY
19