Illustration Of One-Piece Door Installation - Chamberlain 3500 - 1/2HP Series Owner's Manual

ONE-PIECE Door Installation
Before you begin, survey your garage area to
see whether any of the conditions below apply
to your installation.
Header
Wall
Gap between floor and bottom of
Safety
door must not exceed 1/4"
Reversing Sensor
Based on your particular requirements, there are
several installation steps which might call for materials
and/or hardware not included in the carton.
• Step 1, page 13 - Look at the wall or ceiling above
the garage door. The header bracket must be
securely fastened to structural supports.
• Step 5, page 17 - Do you have a finished ceiling in
your garage? If so, a support bracket and additional
fastening hardware (not supplied) may be required.
• Safety reversing sensor, page 21 - Depending on
garage construction, wood blocks may need to be
securely fastened to mounting locations before
sensors are installed.
• Step 10, page 22 - Alternate floor mounting of the
safety reversing sensor will require hardware that is
not provided.
• Step 11, page 25 - Generally, a one-piece door
does not require reinforcement. If your door is
lightweight, you can refer to the information relating
to sectional doors on page 24.
• Step 11, page 25 - Depending on your door's
construction, you might need additional mounting
hardware for the door bracket.
• Do you have an access door in addition to the
garage door? If not, Model 7702C Outside Quick
Release is required. See page 38.
• The gap between the bottom of the garage door
and the floor cannot exceed 1/4". Otherwise, the
safety reverse system may not work properly.
See page 30. The floor or the door should be
repaired.
One-Piece Door without Track
Access Door
Header
Wall
Safety
Reversing
Sensor
One-Piece Door with Track
Reversing
Sensor
Header
Wall
Garage
Door
You may find it helpful to refer back to this page as
you proceed with the installation of your opener.
5
Closed Position
Cable
Pulley
Bracket
Cable
Trolley
Header
Bracket
T-rail
Door
Bracket
Curved
Straight
Door
Door
Arm
Garage
Arm
Door
Slack in Chain Tension
is Normal When
Garage Door is Closed
Floor must be level
Safety
across width of door
Closed Position
Cable
Trolley
Cable
Pulley Bracket
Header
Curved
Bracket
Door Arm
Straight
Door
Door
Bracket
Arm
Manual
Release
Rope & Handle
Access
Door
Safety
Reversing
Sensor
Chain
T-rail
Manual Release
Rope & Handle