Chamberlain 1356M 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 fl oor and
bottom of door must not
Safety Reversing
exceed 1/4" (6 mm)
Sensor
ONE-PIECE DOOR WITH TRACK
Gap between fl oor and
bottom of door must not
Safety Reversing
exceed 1/4" (6 mm)
Sensor
FINISHED CEILING
Support bracket & fastening
hardware is required.
Slack in chain
See page 15.
tension is normal
when garage
door is closed
Access
Door
Safety
Reversing Sensor
Header
Wall
Access
Door
Garage
Door
Safety
Reversing
Sensor
5
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.
Motor unit
Wall-Mounted
Door Control
Chain Pulley
Bracket
Header
Bracket
Door Bracket
Header Garage
Wall Door
CLOSED POSITION
Chain Pulley
Chain
Bracket
Curved
Header
Door Arm
Bracket
Door
Straight
Bracket
Door
Arm
CLOSED POSITION
Trolley
Rail
Emergency
Release
Rope
Straight Curved
& Handle
Door Door
Arm Arm
Trolley
Rail
Emergency Release
Rope & Handle