Chamberlain HD920EV Manual page 15

Installation
5
Hang the garage door opener
To avoid possible SERIOUS NJURY 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.
Finished Ceiling
Unfinished Ceiling
H10 (2)
Lag Screw 5/16"- 18x1-7/8"
5.1
On finished ceilings, use the lag screws
(H10) to attach a support bracket (not
provided) to the structural supports
before installing the garage door opener.
(not provided)
Finished
H10
Ceiling
H10
5.4
Attach the end of each hanging bracket to
the support bracket with appropriate
hardware (not provided).
(not provided)
HARDWARE
H20 (2)
Lock Washer
5/16"-18
5.2
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.
5.5
Attach the garage door opener to the
hanging brackets with the bolts (H21),
lock washers (H15) and nuts (H20).
H15
H21
H20
15
H15 (2)
H21 (2)
Hex Bolt 5/16"- 18x7/8"
Nut 5/16"-18
5.3
Cut both pieces of the hanging bracket
(not provided) to required lengths.
5.6
Remove the 2x4 and manually close the
door. If the door hits the rail, raise the
header bracket.