Position The Opener - LiftMaster MERIK SECURITY+ 790LMK Manual Del Propietário

INSTALLATION STEP 4

Position the Opener

Follow instructions which apply to your door type as illustrated.
SECTIONAL DOOR OR ONE-PIECE DOOR WITH TRACK
A 38 mm board is convenient for setting an ideal
door-to-rail distance.
• Raise the opener onto a stepladder. You will need help at this
point if the ladder is not tall enough.
• Open the door all the way and place a 38 mm board on the top
section beneath the rail.
• If the top section or panel hits the trolley when you raise
the door, pull down on the trolley release arm to disconnect
inner and outer sections. Slide the outer trolley toward
the motor unit. The trolley can remain disconnected until
Installation Step 11 is completed.
ENGAGED ENGAGED
ONE-PIECE DOOR WITHOUT TRACK
• With the door fully open and parallel to the fl oor, measure the
distance from the fl oor to the top of the door.
• Using a stepladder as a support, raise the top of the opener to
this height.
• The top of the door should be level with the top of the motor
unit. Do not position the opener more than 5 cm above this
point.
Trolley
Trolley
Release Arm
Release Arm
RELEASED
RELEASED
To prevent damage to garage door, rest garage door opener rail
on 38 mm board placed on top section of door.
Door Door
Header
Header
Bracket
Bracket
Top of Door
Top of Door
20
Rail
Rail
38 mm is used to determine the
38 mm is used to determine
correct mounting height from ceiling.
the correct mounting height
from ceiling.
38 mm is used to determine the
38 mm is used to determine
correct mounting height from ceiling. the correct mounting height
from ceiling.