Chamberlain CG40DM - Manual (Page 5)

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
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 fl oor MUST NOT exceed 1/4" (6 mm).
Otherwise, the safety reversal system may NOT
work properly.
• The fl oor or the garage door MUST be repaired to
eliminate the gap.
ONE-PIECE DOOR WITH TRACK
Motor Unit
Gap between fl oor and bottom of
door must not exceed 1/4" (6 mm).
Safety Reversing Sensor
Safety Reversing Sensor
Access
Door
Wall-mounted
Door Control
Header Wall
Slack in chain tension
is normal when garage
door is closed.
Rail
CLOSED POSITION
Cable
Rail
Rail Tab
Header Bracket
Door Bracket
Straight
Door Arm
Header
Wall
Garage Door
Support bracket &
fastening hardware is
required. See page 15.
FINISHED CEILING
Trolley
Emergency
Release
Rope &
Handle
Curved
Door Arm
Chain
Gap between fl oor and bottom of
door must not exceed 1/4" (6 mm).
Safety Reversing
Sensor
Safety Reversing Sensor
Access
Door
CLOSED POSITION
Straight
Door Arm
Emergency
Release
Rope &
Handle
Cable
Chain
Rail Tab
Rail
Garage
Door
Door
Bracket
Curved
Door Arm
Header
Bracket
Header
Wall