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Chamberlain merlin MT23O Installation And Operating Instructions Manual page 8

Sectional and tilt garage door opener

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@ anrue rHE 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 structur-
al 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 open-
er lo the structural support (or ceil;ng).
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 flattened ends of brackets to suDoorts with wood
screws (2).
Lift opener and fasten to hanging brackets with screw lock washer. Check to make sure the pole is centred over the
door. REN4OVE 50mm board. Ooerate door manuallv. lf door hits the Dole. raise header bracket.
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MAN;AL RELEAiE 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 over-
hand 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 han-
dle is '1.8m (6 feet) above the floor. Secure with an overhand knot.
Note: lf it is necessary to cut rope, heat seal cut end to
prevent fraying.
Door should be released in the closed
position if possible.
To Disengage:
Pull down the on red handle.
DO NOT USE THE HANDLE TO OPEN OR
CLOSE THE DOOR.
To Engage:
Pull the red handle up and back towards the
opener. The trolley will engage when opener
is activated.
4
DO NAT DI6€NGAGE THE OPENER TO MAN'IAL OPERANON WTH CHILDREN, PERSOIVS OR OIHER
OBJECIS INCLUDING MOTOR VEHICLES VWTHTN THE DOORWAY: (The daor is under signilicant tension and if
the daor has developed a fault or incorrect tension, it may be unsafe and may fall rapidly.)
8

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