Planning - Chamberlain Security+ 7420 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"
Safety
Reversing Sensor
ONE-PIECE DOOR WITHOUT TRACK
Gap between floor
and bottom of door
Safety
must not exceed 1/4"
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 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.
Wall-
mounted
Door
Control
Access
Door
Safety
Reversing Sensor
Header
Wall
Header
Wall
Access
Door
Garage
Door
Safety
Reversing
Sensor
5
WARNING
CAUTION
Motor Unit
CLOSED POSITION
Cable
Pulley Bracket
Cable
Trolley
Header
Bracket
Rail
Door
Bracket
Straight Curved
Door Door
Arm Arm
Garage
Door
CLOSED POSITION
Cable
Trolley
Cable
Pulley Bracket
Header
Curved
Bracket
Door Arm
Straight
Door
Door
Bracket
Arm
Emergency Release
Rope & Handle
Emergency
Release
Rope & Handle
Chain
Rail