Chamberlain CG40 Series Owner's Manual page 5

Planning (Continued)
ONE-PIECE DOOR INSTALLATIONS
• Generally, a one-piece door does not require
reinforcement. If your door is lightweight, refer to
the information relating to sectional doors in
Installation Step 11.
• Depending on your door's construction, you may
need additional mounting hardware for the door
bracket (Step 11).
ONE-PIECE DOOR WITHOUT TRACK
Header
Wall
Gap between floor
and bottom of door
Safety Reversing
must not exceed 1/4"
Sensor
ONE-PIECE DOOR WITH TRACK
Gap between floor
and bottom of door
Safety
must not exceed 1/4"
Reversing Sensor
Wall-
mounted
Door
Control
Access
Door
Safety
Reversing Sensor
Header
Wall
Access
Door
Garage
Door
Safety
Reversing
Sensor
5
WARNING
Without a properly working safety reversal system,
persons (particularly small children) could be
CAUTION
SERIOUSLY INJURED or KILLED by a closing garage
door.
• The gap between the bottom of the garage door and
the floor MUST NOT exceed 1/4". Otherwise, the safety
reversal system may not work properly.
• The floor or the garage door MUST be repaired to
eliminate the gap.
Motor Unit
CLOSED POSITION
Cable
Pulley Bracket
Cable
Header
Bracket
T-rail
Door
Bracket
Straight
Door
Arm
Garage
Header
Door
Wall
CLOSED POSITION
Cable
Trolley
Cable
Pulley Bracket
Curved
Header
Door Arm
Bracket
Door
Straight
Bracket
Door
Arm
Emergency Release
Rope & Handle
Trolley
Chain
Emergency
Release
Curved
Rope
Door & Handle
Arm
Chain
T-rail