Planning (continued) – Chamberlain 248739 User 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).

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.

ONE-PIECE DOOR WITHOUT TRACK

CLOSED POSITION

Straight
Door Arm

Emergency
Release
Rope &
Handle

Header
Wall

Header Wall

Belt

Rail

Trolley Stop Bolt

Trolley

Garage
Door

Door Bracket

Curved
Door
Arm

Header
Bracket

Gap between ﬂ oor
and bottom of door
must not exceed 1/4" (6 mm).

Safety
Reversing
Sensor

Safety Reversing Sensor

Access
Door

FINISHED CEILING

Support bracket &
fastening hardware
is required.
See page 16.

Motor unit

Wall-mounted
Door Control

ONE-PIECE DOOR WITH TRACK