Chamberlain CG40CD 1/2 HP Manual Do Utilizador

5

Access
Door

Safety
Reversing Sensor

Safety
Reversing
Sensor

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

Door
Bracket

Straight
Door
Arm

Garage
Door

Header

Bracket

Curved
Door Arm

Chain

Emergency
Release
Rope &
Handle

Cable

Rail

Trolley Stop Bolt

Header
Wall

• 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).

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

Slack in chain tension 
is normal when garage 
door is closed.

Header

Bracket

Trolley

Straight
Door
Arm

Emergency
Release
Rope & Handle

Door Bracket

Curved
Door
Arm

Header
Wall

Cable

Rail

Garage Door

Trolley Stop Bolt

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.