Position The Opener - Chamberlain 1120E-1/2HP Owner's Manual

INSTALLATION STEP 3
Attach T-rail to Header Bracket
• Position opener on garage floor below header
bracket. Use packing material as a protective base.
• Position the chain pulley against the header
bracket.
• Align the bracket holes and join with a clevis pin as
shown.
• Insert ring fastener to secure.
NOTE: If the door spring is in the way you'll need
help. Have someone hold the opener securely on
a temporary support to allow the T-rail to clear
the spring.
INSTALLATION STEP 4

Position the Opener

Follow instructions which apply to your door
type as illustrated.
SECTIONAL DOOR & 1-PIECE DOOR
WITH TRACK
NOTE: A 25mm board is convenient for setting
an ideal door-to-T-rail distance. It is not
necessary when headroom is insufficient.
• Raise the opener onto a stepladder.
You wil need help at this point if the ladder is
not tall enough.
• Open garage door. Place a 25mm board on the
top section of door near centerline as shown. Rest
T-rail on board as shown.
Door
If the top panel hits the trolley when you raise
the door, pull down on the trolley release arm to
disconnect the inner and outer sections. The
trolley can remain disconnected until Step 11 is
completed.
Trolly
25mm board
Trolly
Release Arm
Header
Bracket
Clevis Pin
5/16"x2-3/4 "
To prevent damage to steel, aluminum,
fiberglass or glass panel doors, do not
rest the opener on the door without using
a 25mm board.
1-PIECE DOOR WITHOUT TRACK
• With the door fully open and parrallel to the floor,
measure the distance from the floor to the top of
the door.
• Using a stepladder as a support, raise the opener
to the same distance as the door from the floor
(it will be at a slight angle as shown).
• The top of the door should be level with the top of
opener. Do not position opener more than 5cm
above this point.
Header Bracket
16
Fastener
Ring
Chain
Pulley
Bracket
Packing
Material