Preparing Your Door; Tools Needed; Specifications - Chamberlain Liftmaster Security+ 3900PLD Owner's Manual

Preparing your Door

Before you begin:
• Disable locks.
• Remove any ropes connected to door.
• Complete the following test to make sure your door is
balanced and is not sticking or binding:
1. Lift the door about halfway as shown. Release the
door. If balanced, it should stay in place, supported
entirely by its springs.
2. Raise and lower the door to see if there is any
binding or sticking.
If your door binds, sticks or is out of balance, call a
trained door systems technician.
3. Verify equal cable tension on each side of door.
Cable tension should remain equal during the entire
travel of the door.
Sectional Door

Tools needed

During assembly, installation and adjustment of the
operator, instructions will call for hand tools as illustrated
below.
Stepladder
Drill
Tape Measure
5/32", 3/16", 5/16"
and 3/4" Drill Bits
1/4", 5/16" & 3/8" Sockets
and Wrench with 6" Extension
To prevent possible SERIOUS INJURY or DEATH:
• ALWAYS call a trained door systems technician if door binds,
sticks or is out of balance. An unbalanced door may not
reverse when required.
• NEVER try to loosen, move or adjust door, door springs,
cables, pulleys, brackets or their hardware, ALL of which are
under EXTREME tension.
• Disable ALL locks and remove ALL ropes connected to door
BEFORE installing and operating door operator to avoid
entanglement.
To prevent damage to door and operator:
• ALWAYS disable locks BEFORE installing and operating the
operator.
• ONLY operate door operator at 120V, 60 Hz to avoid
malfunction and damage.
• DO NOT exceed 10 complete cycles of door operation per
hour.
Volts . . . . . . . . . . . . . . . . . . . 120Vac - 60 Hz, ONLY
Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 AMP
Rated Load. . . . . . . . . . . . . . . . . 325 in.lb/sec
Pliers
Pencil
Screwdriver
Adjustable End Wrench
Torque Meter (not shown)
4

Specifications

10 Cycles per Hour
Wire Cutters
3/16" and 1/8"
Hex Key Wrench
Claw Hammer
Needle Nose Pliers