Chamberlain Security+ 3900PLD - Manual (Page 3)

Safety
Reversing Sensor
Safety
Reversing
Sensor
Torsion Spring
Motor unit
Wall-mounted Single
Button Control Station
Access Door
Gap between floor
and bottom of door must not exceed 1/4" (6 mm).
Cable Tension
Monitor
Drum
3
Planning
Survey your area to see if any of the conditions below
apply to your installation. Additional materials may be
required. You may find it helpful to refer back to this page
as you proceed with the installation of your operator.
Depending on your requirements, there are several
installation steps which may call for materials or hardware
not included in the carton.
This operator is compatible with:
• Doors that use a torsion bar, springs and a door no
more than 14' (4.2 m) high.
• 4"-6" (10 cm - 15 cm) drums, not to be used on tapered
drums over 6" (15 cm).
• High lift and standard lift sectional doors up to 14'
(4.2 m) high.
• Doors up to 18' (5.4 m) wide.
• Doors up to 180 sq. ft. (16.7 sq. m).
• 1" (2.5 cm) torsion bar only.
• Review or inspect proposed installation area. Operator
can be installed on left or right side of door. Select the
side that meets the requirements listed below.
- Must have minimum of 2-1/2" (6.4 cm) between the
wall and the center of the torsion bar.
- Must have minimum of 3" (7.6 cm) between the ceiling
and the center of torsion bar.
- Must have minimum of 8" (20.3 cm) between the side
wall (or obstruction) and the end of torsion bar.
• The torsion bar must extend at least 1" to 5"
(2.5 cm to 12 cm) past the bearing plate.
• An electric outlet is required within 6' (1.8 m) of the
installation area. If outlet does not exist, contact a
qualified electrician.
• Depending upon building construction, extension
brackets or wood blocks may be needed to install safety
reversing sensors.
• Alternate floor mounting of the safety reversing sensors
will require hardware not provided.
• A model 475LM EverCharge TM Standby Power Unit is
strongly recommended if there is no access door to the
garage, as this operator cannot be used in conjunction
with an external emergency release mechanism.
• Any gap between the floor and the bottom of the door
must not exceed 1/4" (6 mm). Otherwise the safety
reversal system may not work properly.
NOTE: Inspect the torsion bar while the door is raised and
lowered. It is important that there is no noticeable
movement up and down or left and right. If this type of
movement is not corrected, life of this operator will be
greatly reduced.