lift-master 1280c Manual De Usuario

4

Safety Reversing Sensor

Horizontal and vertical reinforcement

is needed for lightweight garage doors

(fiberglass, steel, aluminum, door with glass panels, etc.).

See page 20 for details.

Support bracket & 

fastening hardware

is required.

See page 13.

 — — —        — — —        — —

Door Center

Header Wall

Safety

Reversing

Sensor

Floor must be level

across width of door

FINISHED CEILING

Extension Spring

Torsion Spring

Access Door

OR

OR

One-Piece Door-Extension Spring

Header

Wall

Door

Track

Slack in belt tension

is normal when

garage door is closed.

Before you begin, survey your garage area to see whether any of the conditions below apply to your installation.

Safety Reversing Sensor

FINISHED CEILING

Support bracket

& fastening

hardware is required.

See page 13.

Safety

Reversing 

Sensor

Header

Wall

Access Door

Gap between floor and bottom of

door must not exceed 1/4".