Chamberlain HD920EV Owner's Manual page 24

Installation
STEP 13 Install the Protector System
OPTION B
WALL INSTALLATION
If additional clearance is needed an extension bracket (not provided) or wood blocks can be used. Make
sure each bracket has the same amount of clearance so they will align correctly.
1. Position the sensor bracket against the wall with the curved arms facing the door. Make sure
there is enough clearance for the beam to be unobstructed. Mark holes.
2. Drill 3/16 inch pilot holes for each sensor bracket and attach the sensor brackets to the wall
using lag screws (not provided).
3. Slide the carriage bolt into the slot on each sensor.
4. Insert the bolt through the hole in the sensor bracket and attach with the wing nut. The lenses
on both sensors should point toward each other. Make sure the lens is not obstructed by the
sensor bracket.
1
(Not provided)
No more than
6 inches (15 cm)
3
Carriage Bolt
Lens 1/4"-20x1/2"
®
(continued)
2
(Not provided)
4
Wing Nut
1/4"-20
OPTION C
FLOOR INSTALLATION
Use an extension bracket (not provided) or wood block to raise the sensor bracket if needed.
1. Carefully measure the position of both sensor brackets so they will be the same distance from
the wall and unobstructed.
2. Attach the sensor brackets to the floor using concrete anchors (not provided).
3. Slide the carriage bolt into the slot on each sensor.
4. Insert the bolt through the hole in the sensor bracket and attach with the wing nut. The lenses
on both sensors should point toward each other. Make sure the lens is not obstructed by the
sensor bracket.
1
3
Carriage Bolt
1/4"-20x1/2"
23
2
(Not provided)
4
Wing Nut
1/4"-20