Planning - Chamberlain 1240R - 1/4HP 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
Safety Reversing
not exceed 1/4" (6 mm)
Sensor
ONE-PIECE DOOR WITH TRACK
Gap between floor and
Safety
bottom of door must not
Reversing
exceed 1/4" (6 mm)
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" (6 mm). 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
Chain
Pulley Bracket
Header
Bracket
Rail
Door
Bracket
Straight
Door
Arm
Header Garage
Wall
Door
CLOSED POSITION
Chain
Trolley
Chain
Pulley Bracket
Curved
Header
Door Arm
Bracket
Door
Bracket Straight
Door
Arm
Trolley
Emergency
Release
Curved
Rope
Door & Handle
Arm
Rail
Emergency Release
Rope & Handle