Chamberlain ML750 Installation And Operating Instructions Manual page 8

16
HANG THE OPENER
The opener must be securely fastened to a
structural support of the garage.
Three representative installations are shown.
Yours may be different. Hanging brackets (1)
should be angled (Figure A) to provide rigid
support. On finished ceilings, (Figure B) attach a
sturdy metal bracket (not supplied) (4) to a
structural support before installing the opener. For
concrete ceiling mount, (Figure C), use concrete
anchors (5) provided.
On each side of opener measure the distance
from the opener to the structural support (or
ceiling).
Cut both pieces of the hanging bracket to required
lengths. Flatten one end of each bracket and bend
or twist to fit the fastening angles. Do not bend at
the bracket holes. Drill 4.5mm (3/16") pilot holes
in the structural supports (or ceiling).
Attach brackets to supports with wood screws (2).
Lift opener and fasten to hanging brackets with
screw, lock washer and nut (3). Check to make
sure rail is centred over the door. REMOVE 50mm
or 100mm board. Operate door manually. If door
hits the rail, raise header bracket. Use rail grease
and lubricate bottom inside surface of rail (6).
17
ATTACH EMERGENCY RELEASE ROPE & HANDLE
Thread one end of rope (1) through hole in top of red handle so
"NOTICE" reads right side up as shown (3). Secure with an
overhand knot (2). Knot should be at least 25mm (1") from end
of the rope to prevent slipping.
Thread other end of rope through hole in release arm of the
outer trolley (4). Adjust rope length so that handle is less than
1.8m (6 feet) above the floor. Secure with an overhand knot.
NOTE: If it is necessary to cut rope, heat seal cut end to
prevent fraying
.
Door should be released in the closed position if possible.
To release the trolley PULL down on the red handle.
To re-engage PULL the red handle back towards the opener
(trolley will re-engage automatically when operated).
DO NOT USE THE HANDLE TO OPEN OR CLOSE THE DOOR.
DO NOT DISENGAGE THE OPENER IF ANY PERSONS OR OTHER OBJECTS INCLUDING MOTOR VEHICLES
ARE WITHIN THE DOORWAY: (The door is under significant tension and if the door has developed a fault or
incorrect tension, it may be unsafe and may fall rapidly).
A
2
1
1
3
6
2
3
5
7
B
4
3
2
1
6
C
5
1
2
6
2
3
2
3