Chamberlain 4142DC 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 10.
• Depending on your door's construction, you may need
additional mounting hardware for the door bracket (Step 10).
ONE-PIECE DOOR WITHOUT TRACK
Header
Wall
Gap between floor and bottom
of door must not exceed 6 mm.
Safety
Reversing Sensor
(Optional accessory)
ONE-PIECE DOOR WITH TRACK
Safety Reversing
Sensor
(Optional Accessory)
Access
Door
Safety
Reversing Sensor
(Optional accessory)
Access
Door
Safety Reversing
Gap between floor Sensor
and bottom of door (Optional Accessory)
must not exceed 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 6 mm. Otherwise, the safety reversal
system may not work properly.
• The floor or the garage door MUST be repaired to eliminate
the gap.
Cable
Pulley Bracket
Header
Bracket
Door
Bracket
Header
Wall
Garage
Door
Cable
Pulley Bracket
Header
Wall
Header
Wall-
Bracket
Mounted
Door
Control
Door
Garage
Bracket
Door
5
CLOSED POSITION
Cable
Trolley
Rail
Emergency
Release
Straight Curved
Rope & Handle
Door Door
Arm Arm
CLOSED POSITION
Trolley
Chain
Curved
Door Arm
Straight
Door
Arm
Emergency Release
Rope & Handle
Rail