Chamberlain Power Drive Security+ 182638DM 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 must not exceed 1/4" (6 mm).
Safety Reversing Sensor
ONE-PIECE DOOR WITH TRACK
Safety
Reversing Sensor
Rail
Access
Door
Safety Reversing
Sensor
Access
Door
Safety
Reversing
Gap between floor
Sensor
and bottom of door
must not exceed 1/4" (6 mm).
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" (6 mm). Otherwise, the safety
reversal system may not work properly.
• The floor or the garage door MUST be repaired to eliminate
the gap.
Slack in chain tension
is normal when garage
Motor Unit
door is closed.
Wall-mounted
Door Control
Door Bracket
Header
Wall
Trolley Stop Bolt
Header
Wall
Header
Bracket
Door
Bracket
Garage
Door
5
CLOSED POSITION
Trolley Stop Bolt
Cable
Header
Bracket
Rail
Straight
Curved
Door
Door
Arm
Arm
Garage Door
CLOSED POSITION
Cable
Curved
Door Arm
Straight
Door
Arm
Trolley
Emergency
Release
Rope & Handle
Chain
Rail
Emergency
Release
Rope &
Handle