Planning; Sectional Door Installations - LiftMaster MERIK SECURITY+ 790LMK Manual Del Propietário

Planning

Identify the type and height of your garage door. Survey your
garage area to see if any of the conditions below apply to your
installation. Additional materials may be required. You may
fi nd it helpful to refer back to this page and the accompanying
illustrations as you proceed with the installation of your opener.
Depending on your requirements, there are several installation
steps which may call for materials or hardware not included in the
carton.
• Installation Step 1 – Look at the wall or ceiling above the
garage door. The header bracket must be securely fastened to
structural supports.
• Installation Step 5 – Do you have a fi nished ceiling in your
garage? If so, a support bracket and additional fastening
hardware may be required.
• Do you have an access door in addition to the garage door?
If not, Model 1702E Outside Quick Release is required. See
Accessories page.
SECTIONAL DOOR INSTALLATION
Horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, steel, aluminum, door with
glass panels, etc.). See page 25 for details.
Safety Reversing Sensor
(Optional Accessory)
Header Wall
Vertical
Centerline of
Garage Door
Safety Reversing Sensor
Gap between floor
(Optional Accessory)
and bottom of door
must not exceed 6 mm.
• Look at the garage door where it meets the fl oor. Any gap
between the fl oor and the bottom of the door must not exceed
6 mm. Otherwise, the safety reversal system may not work
properly. See Adjustment Step 3. Floor or door should be
repaired.

SECTIONAL DOOR INSTALLATIONS

• Do you have a steel, aluminum, fi berglass or glass panel
door? If so, horizontal and vertical reinforce ment is required
(Installation Step 10).
• The opener should be installed above the center of the door. If
there is a torsion spring or center bearing plate in the way of
the header bracket, it may be installed within 1.2 m to the left or
right of the door center. See Installation Steps 1 and 10.
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 21.
Slack in chain tension
is normal when
garage door is closed
Extension
Spring
OR
Torsion
Spring
Wall-mounted
Door Control
Access
Door
Header
Header
Wall
Wall
Garage Garage
Door Door
4
Motor unit
CLOSED POSITION
CLOSED POSITION
Header
Header Cable Pulley
Chain Sprocket
Bracket
Bracket Bracket
Bracket
Trolley
Trolley
Garage
Garage
Door Door
Spring Spring
Straight Straight
Door
Door
Emergency
Emergency Release
Arm
Arm
Release
Rope & Handle
Rope & Handle
Curved
Curved
Door Door
Arm
Arm
Door Bracket
Door Bracket
T-rail
T-rail
Chain
Chain