Planning - Chamberlain LiftMaster Security+ 311 Owner's Manual

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 must not exceed 1/4" (6 mm).
Safety
Reversing Sensor
ONE-PIECE DOOR WITH TRACK
Gap between floor
and bottom of door
must not exceed 1/4" (6 mm)
Safety Reversing
Sensor
Without a properly working safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door.
• The gap between the bottom of the garage door and
• The floor or the garage door MUST be repaired to
Access
Door
Safety
Reversing Sensor
Header
Wall
Header
Wall
Access
Door
Wall-
Mounted
Door
Control
Garage
Door
Safety Reversing
Sensor
5
WARNING
CAUTION
the floor MUST NOT exceed 1/4" (6 mm). Otherwise,
the safety reversal system may not work properly.
eliminate the gap.
Motor Unit
CLOSED POSITION
Idler
Pulley Bracket
Header
Bracket
Rail
Door
Bracket
Straight
Door
Arm
Garage
Door
CLOSED POSITION
Cable
Pulley Bracket
Curved
Header
Door Arm
Bracket
Straight
Door
Door
Bracket
Arm
Trolley
Emergency
Release
Curved
Rope
Door & Handle
Arm
Trolley Chain
Rail
Emergency Release
Rope & Handle