Craftsman 139.53990 Manual Del Propietário página 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
Gap between floor
and bottom of door
Safety
must not exceed 1/4" (6 mm)
Reversing Sensor
Rail
Slack in chain tension
is normal when garage
door is closed
Wall-mounted
Door Control
Access
Door
Safety Reversing
Sensor
Header
Access
Wall
Door
Safety
Reversing
Sensor
5
WARNING
Without a properly working safety reversal system,
persons (particularly small children) could be
CAUTION
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.
Motor Unit
CLOSED POSITION
Trolley Stop Bolt
Header
Bracket
Rail
Door Bracket
Straight
Door
Arm
Header
Wall
Garage Door
CLOSED POSITION
Trolley Stop Bolt
Cable
Curved
Header
Door Arm
Bracket
Door
Straight
Bracket
Door
Arm
Garage
Door
Trolley
Cable
Emergency
Release
Rope & Handle
Curved
Door
Arm
Chain
Rail
Emergency
Release
Rope &
Handle