Chamberlain C253 Guide De L'utilisateur page 7

Installation
If you are replacing a LiftMaster, Chamberlain, or Craftsman garage door opener you
may use the existing door bracket, see Installation step 10 in the Installation
Manual.
Installation 10 - Install the Door Bracket
Fiberglass, aluminum or lightweight steel garage doors WILL REQUIRE reinforcement BEFORE installation of
door bracket. Contact the garage door manufacturer or installing dealer for opener reinforcement instructions or
reinforcement kit. Failure to reinforce the top section as required according to the door manufacturer may void the
door warranty.
Sectional Doors Only
1. Center the door bracket (O) on the door. Note correct UP placement, as stamped inside bracket.
2. Position the top edge of the bracket 2"-4" (5-10 cm) below the top edge of the door, OR directly below any
structural support across the top of the door.
3. Mark, drill holes and install as follows, depending on your door's construction.
Metal or light weight doors using a vertical angle iron brace in the door panel support and the door
bracket:
Drill 3/16" fastening holes. Secure the door bracket with self-threading screws (OO). (Figure 1)
l
Alternately, use two 5/16"-18x2" bolts, lock washers and nuts (not provided). (Figure 2)
l
Metal, insulated or light weight factory reinforced doors:
Drill 3/16" fastening holes. Secure the door bracket with self-threading screws (OO). (Figure 3)
l
Wood doors:
Use top and bottom or side to side door bracket holes. Drill 5/16" holes through the door and secure
l
bracket with 5/16"-18x2" carriage bolts, lock washers and nuts (not provided). (Figure 4)
NOTE: The self-threading screws (OO) are not intended for use on wood doors.
To continue, go to Installation step 11 in the
Installation Manual
Horizontal Reinforcement
Vertical Reinforcement
FIGURE 1
Vertical
Reinforcement
Center of Door
UP
O
OO
FIGURE 3
Center of Door
UP
OO
7/16"
7
HARDWARE
OO
Self-Threading Screw
1/4"-14x5/8"
Sectional Door
FIGURE 2
Vertical Reinforcement
Hardware
7/16"
(not provided)
FIGURE 4
Inside Edge of Door or
Reinforcement Board
Hardware
(not provided)
Center of Door
Center of Door
O
UP
UP