Planning - Chamberlain Power Drive Security+ HD400DM Owner's Manual

Planning

Identify the type and height of your garage door. Survey
your garage area to see if any of the conditions below
apply to your installation. Additional materials may be
required. You may fi nd it helpful to refer back to this page
and the accompanying illustrations as you proceed with
the installation of your opener.
Depending on your requirements, there are several
installation steps which may call for materials or hardware
not included in the carton.
• Installation Step 1 – Look at the wall or ceiling above
the garage door. The header bracket must be securely
fastened to structural supports.
• Installation Step 5 – Do you have a fi nished ceiling in
your garage? If so, a support bracket and additional
fastening hardware may be required.
• Installation Step 10 – Depending upon garage
construction, extension brackets or wood blocks may
be needed to install sensors.
• Installation Step 10 – Alternate fl oor mounting of
the safety reversing sensor will require hardware not
provided.
SECTIONAL DOOR INSTALLATION
Horizontal and vertical
reinforcement is needed for
lightweight garage doors
(fi berglass, steel, aluminum,
door with glass panels, etc.).
See page 23 for details.
Header Wall
Safety
Reversing
Sensor
Slack in chain
tension is normal
when garage door
is closed.
Torsion Spring
Vertical
Centerline of
Garage Door
Gap between fl oor and
bottom of door must not
exceed 1/4" (6 mm).
• Do you have an access door in addition to the garage
door? If not, Model 7702CB Emergency Key Release is
required. See Accessories page.
• Look at the garage door where it meets the fl oor. Any
gap between the fl oor and the bottom of the door must
not exceed 1/4" (6 mm). Otherwise, the safety reversal
system may not work properly. See Adjustment Step 3.
Floor or door should be repaired.
SECTIONAL DOOR INSTALLATIONS
• Do you have a steel, aluminum, fi berglass or glass
panel door? If so, horizontal and vertical reinforce ment
is required (Installation Step 11).
• The opener should be installed above the center of the
door. If there is a torsion spring or center bearing plate
in the way of the header bracket, it may be installed
within 4 feet (1.22 m) to the left or right of the door
center. See Installation Steps 1 and 11.
• If your door is more than 7 feet (2.13 m) high, see rail
extension kits listed on Accessories page.
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 15.
Extension Spring
OR
Wall-Mounted
Door Control
Access
Door
Safety
Reversing
Sensor
Header
Wall
Garage
Door
4
Motor Unit
Header
CLOSED POSITION
Trolley
Bracket
Trolley
Stop Bolt
Garage
Door
Spring
Straight
Door
Arm
Curved
Door Arm
Door
Bracket
Chain
Emergency
Release
Rope &
Handle