Chamberlain 248730 Garage Door Opener User Manual


 
12
Attach Hanging Brackets to Ceiling and Fasten Motor Unit to Hanging Brackets
Remove the 2x4 and Close Door
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 t oward the motor unit. The trolley can remain
disconnected until installation is completed.
NOTE: The garage door opener motor head will typically
sit lower than the header bracket, therefore, the rail will
be at an angle.
Open Door to Full Open Position and Rest
Rail on a 2x4 to Position Opener at the
Proper Angle for Hanging from the Ceiling
NOTE: Before the motor unit is secured to the ceiling, insure that the motor unit and rail are centered over
the door. If you mounted the header bracket off center, hang the motor unit the same distance. Concrete
anchors must be used if installing any brackets into masonry.
Option with unfi nished ceilingOption with fi nished or unfi nished ceiling
To prevent damage to garage door, rest garage door
opener rail on 2x4 placed on top section of door.
To avoid possible SERIOUS INJURY from a falling
garage door opener, fasten it SECURELY to structural
supports of the garage.
ALL HARDWARE SHOWN ACTUAL SIZE
POSITION AND HANG MOTOR UNIT
OR
2
3
1
2 x 4
Bracket (Not Provided)
Measure
Distance
C6
Lag Screws or
Concrete Anchors
(Not Provided)
C2 Nut
Remove
2 x 4
(Not Provided)
Bolt 5/16"-18 x 7/8"
Lock Washer 5/16"
Nut 5/16"-18
C3 Lock Washer
Close door
C7 Hex Bolt
C3 Lock
Washer
C2 Nut
C6 Lag Screw
C6 Lag Screws
C7 Hex Bolt
C7 Hex Bolt
C3 Lock
Washer
C2 Nut