Attach The Emergency Release Rope And Handle; Install Power Door Lock (Not Provided) - Chamberlain Liftmaster Security+ 3900PLD Owner's Manual

INSTALLATION STEP 2
Attach the Emergency Release Rope
and Handle
• Thread one end of the rope through the hole in the top
of the red handle so "NOTICE" reads right side up as
shown. Secure with an overhand knot at least 1"
(2.5 cm) from the end of the rope to prevent slipping.
• Thread the other end of the rope through the loop in the
emergency release cable.
• Adjust rope length so the handle is no higher than 6'
(1.83 m) above the floor. Secure with an overhand knot.
NOTE: If it is necessary to cut the rope, heat seal the cut
end with a match or lighter to prevent unraveling.
INSTALLATION STEP 3
Install Power Door Lock
(Not Provided)
The lock is used to prevent the door from being
manually opened once the door is fully closed.
1. Select a door roller to mount the lock above. Check
for clearance. If possible select a roller on the same
side of the door as the motor unit.
The second roller up from the bottom is ideal in
most installations.
2. Ensure rail surface is clean and adhere lock
template to achieve a 3" (7.6 cm) distance between
the center of the roller and the pin hole (Figure 1).
3. Drill holes as marked on the template.
4. Fasten power door lock to the outside of the garage
door track with hardware provided.
5. Run bell wire up wall to motor unit. Use insulated
staples to secure wire in several places.
6. Plug connector into the motor unit (Figure 2).
NOTE: Lock must be mounted within 10' of the
power head.
HARDWARE SHOWN ACTUAL SIZE
Lock Screw
1/4-20 x 1/2" (2)
Staples
To prevent possible SERIOUS INJURY or DEATH from a falling
door:
• If possible, use emergency release handle to disengage door
ONLY when door is CLOSED. Weak or broken springs or
unbalanced door could result in an open door falling rapidly
and/or unexpectedly.
• NEVER use emergency release handle unless doorway is
clear of persons and obstructions.
Motor Unit
Emergency
Release Cable
Overhand
Knot
Rope
Emergency
Release Handle
Overhand
Knot
Figure 1
T O P
D R IL
L 5 /1
6 "
D R IL
L 3 /4
"
D R IL
L 5 /1
6 "
Approx. 3"
(7.6 cm)
Roller
Figure 2
8
Garage
Door Track
Door Track
Lock Template
TO P