Chamberlain 2000SDC 1/2HP - Manual (Page 8)

Installation Section: Pages 8 - 23
Installation Step 1
Determine Header Bracket Location
Installation procedures vary according to garage
door types. Follow the instructions which apply to
your door.
SECTIONAL Door or
ONE PIECE Door with Track
If the header bracket is not rigidly fastened to a
structural support on the header wall or ceiling, the
safety reverse system may not work properly (see page
26). The door might not reverse when required, and
could cause serious injury or death.
The garage door springs, cables, pulleys, brackets and
their hardware are under extreme tension. Do not attempt
to loosen, move or adjust them yourself. Serious
personal injury or death could result. Call for
professional garage door service.
Vertical
Guideline
Finished
Ceiling
• Close the door and mark the inside
vertical centerline of the garage door.
• Extend the line onto the header wall
above the door.
Remember, you can fasten the header
bracket within 2 feet of the left or right
of the door center only if a torsion
spring or center bearing plate is in the
way; or you can attach it to the ceiling
(refer to page 10) when clearance is
minimal. (It may be mounted on the
wall upside down if necessary, to gain
approximately 1/2”.)
If you need to install the header bracket on
a 2x4 (on wall or ceiling), use lag screws
(not supplied) to securely fasten the 2x4 to
structural supports as shown here and on
page 9.
Open your door to the highest point
of travel as shown. Draw an inter­
secting horizontal line on the header
wall 3" above the high point. This
height will provide travel clearance
for the top edge of the door.
Sectional door
with curved track
Proceed to Step 2, page 10.
8