Chamberlain 1120E-1/2HP Owner's Manual page 4

BEFORE YOU BEGIN, PLEASE TAKE SOME TIME TO CAREFULLY EXAMINE THE ILLUSTRATIONS OF
TYPICAL GARAGE DOOR OPENER INSTALLATIONS. Some installation instructions vary.
Do you have a finished ceiling in your garage? If so, you will need a support bracket and additional fastening
hardware. Refer to Installation Step 5, Page 17 for specific requirements.
Do you have a lightweight or metal door (or does it have glass panels)? If so, horizontal and vertical
reinforcement is required. Refer to Installation Step 10, Page 20.
If possible, install the door opener 2.1m or more above floor with the manual release handle mounted
1.8m above the floor.
SECTIONAL
DOOR INSTALLATION
Horizontal & Vertical
Support - Not Supplied
(Needed Only for
Lightweight Garage
Door Installation)
ONE-PIECE DOOR INSTALLATION
Support Bracket
and Fastening
Hardware
(Not Supplied)
Slack in chain tension
is normal when
garage door is closed
Header Bracket
Chain Pulley
Horizontal
Garage Door
Reinforcement
(If needed)
Header
Garage
Door
Reinforcement (if needed)
Support Bracket
and Fastening
Hardware
(Not Supplied)
Slack in chain tension
is normal when
garage door is closed
Chain
Pulley Bracket
Header
Bracket
Door Bracket
& Plate
Garage
Header
Door
4
Trolley
Bracket
Chain
Garage
Door
Spring
Straight
Door
Arm
Manual
Curve
Trolley
Door
Release
Arm
Door Bracket
& Plate
Vertical Garage Door
Trolley
Curve
Straight
Door
Door
Arm
Arm
Chain
Manual
Trolley
Release