Chamberlain LiftMaster Security+ 1256R - One-Piece Door Installation

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)
Without a properly working safety reversal system,
persons (particularly small children) could be
SERIOUSLYINJUREDor KILLEDby a closing garage
door.
• The gap betweenthe bottom of the garage door and
the floor MUSTNOTexceed1/4" (6 mm). Otherwise,
the safety reversal system may not work properly.
• The floor or the garage door MUSTbe repairedto
eliminate the gap.
ONE-PIECE DOOR WITHOUT TRACK
Header
_ _ Gap between floor
and bottom of door must
Safety Reversing not exceed 1/4" (6 mm)
Sensor
Slack in chain tension
is normal when
garage door is closed.
FINISHED CEILING
Support bracket
& fastening
hardware is required.
See page 17.
O
Safety Reversing
Sensor
Motor Unit
CLOSED POSITION
Chain
Pulley Bracket Trolley
Straight
Door Door
Arm Arm
Garage
Door
Emergency
Rope
& Handle
l
ONE-PIECE DOOR WITH TRACK I
E CLOSED POSiTiON
Chain Trolley
Pulley Bracket Chain ]_
Curv ...............
_c k;to c::oo_ A/,!o _: ) j _ Rat,
/_// Bracket !!o? ht E/ergency Release
Rope & Handle
/--i_l__ _ - \ Safety.
_ Heverstng --
i__--[ Gap between floor and Sensor
Safety bottom of door must not
Reversing exceed 1/4" (6 mm) I
Sensor j