Chamberlain 248754 - Manual (Page 5)

5
Access
Door
Safety
Reversing
Sensor
Safety
Reversing
Sensor
Gap between floor
and bottom of door
must not exceed 1/4" (6 mm).
Garage
Door
Header
Wall
Header
Bracket
Door
Bracket
Straight
Door
Arm
Curved
Door Arm
Trolley
Emergency
Release
Rope &
Handle
Rail
Belt Trolley Stop Bolt
CLOSED POSITION
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 12.
• Depending on your door’s construction, you may need
additional mounting hardware for the door bracket
(Step 12).
Safety Reversing Sensor
Access
Door
FINISHED CEILING
Support bracket
& fastening
hardware is required.
See page 16.
Safety Reversing
Sensor
Header Wall
Gap between floor
and bottom of door must not exceed 1/4" (6 mm).
Wall-mounted
Door Control
Rail
Motor Unit
ONE-PIECE DOOR WITHOUT TRACK
CLOSED POSITION
Header
Wall
Header
Bracket
Trolley
Straight
Door
Arm
Emergency
Release
Rope & Handle Door Bracket
Curved
Door
Arm
Garage
Door
Trolley Stop Bolt
Belt
Rail
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.
ONE-PIECE DOOR WITH TRACK