Chamberlain C400 Owner's Manual page 15

Installation
STEP 5 Hang the Garage Door Opener
To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it SECURELY to structural
supports of the garage. Concrete anchors MUST be used if installing ANY brackets into masonry.
Hanging the garage door opener will vary depending on your garage. Below are three example installations. Your
installation may be different. For ALL installations the garage door opener MUST be connected to structural supports.
The instructions illustrate one of the examples below.
1. On finished ceilings, use the lag screws to attach a support bracket (not provided) to the structural
supports before installing the garage door opener.
2. Make sure the garage door opener is aligned with the header bracket. Measure the distance from each side
of the garage door opener to the support bracket.
3. Cut both pieces of the hanging bracket to required lengths.
4. Attach the end of each hanging bracket to the support bracket with appropriate hardware (not provided).
5. Attach the garage door opener to the hanging brackets with the hex bolts, lock washers, and nuts.
6. Remove the 2x4 and manually close the door. If the door hits the rail, raise the header bracket.
EXAMPLES
Finished Ceiling
1
Finished Ceiling
Not Provided
Lag Screw
Lag Screw
4 5
Hex Bolt
Not
Provided
15
HARDWARE
Lag Screw
5/16"-9x1-5/8"
Lock Washer
Hex Bolt
5/16"-18
5/16"-18x7/8"
Unfinished Ceiling
2
Not Provided
6
Lock
Washer
Nut
Nut
5/16"-18
3