Chamberlain 459950 Manual De Usuario

15

A 2x4 on its side is convenient for setting an ideal 
door-to-rail distance. 

•  Remove foam packaging.

•   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 on its side on 

the top section of the door beneath the rail.

•   The top of the door should be level with the top of the 

motor unit. Do not position the opener more than
4" (10 cm) above this point.

Follow instructions which apply to your door type as 
illustrated.

A 2x4 laid fl at is convenient for setting an ideal door-to-rail 
distance. 

•  Remove foam packaging.

•   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 fl at 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.

To prevent damage to garage door, rest garage door 
opener rail on 2x4 placed on top section of door.

Rail

2x4 is used to determine 
the correct mounting height 
from ceiling.

ENGAGED

Trolley
Release Arm

Door

RELEASED

Header 
Bracket

2x4 is used to determine 
the correct mounting height 
from ceiling.

Top of Door