LiftMaster 1355 1355 Manual - Page 16

Installation Step 4

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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 2x4 laid flat is convenient for setting an ideal doorto-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 2x4 laid flat 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 12 is completed. WARNING CAUTION To prevent damage to garage door, rest garage door opener rail on 2x4 placed on top section of door. Rail Door 2x4 is used to determine the correct mounting height from ceiling. ENGAGED Trolley Release Arm RELEASED ONE-PIECE DOOR WITHOUT TRACK • With the door fully open and parallel to the floor, measure the distance from the floor 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 2" (5 cm) above this point. Header Bracket Top of Door 2x4 is used to determine the correct mounting height from ceiling. 16

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16
ONE-PIECE DOOR WITHOUT TRACK
•
With the door fully open and parallel to the floor,
measure the distance from the floor 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 2" (5 cm) above this point.
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 2x4 laid flat 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 2x4 laid flat
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 12
is completed.
Rail
Door
2x4 is
u
sed to determine
the correct mo
u
nting height
from ceiling.
Trolley
Release Arm
E
N
GAGED
RELEASED
To prevent damage to garage door, rest garage door
opener rail on 2x4 placed on top section of door.
CAUTION
Header
Bracket
Top of Door
2x4 is
u
sed to determine
the correct mo
u
nting height
from ceiling.