Installation - Merlin Commander Extreme MS125MYQ Series Installation And Operating Instructions Manual

Wear protective goggles when working overhead to protect your eyes from injury.
Disengage all existing garage door locks to avoid damage to the garage door.
To avoid serious personal injury from entanglement, remove all ropes connected to the garage door before
installing the opener.
HEADER BRACKET POSITIONING
11
The header bracket must be rigidly fastened to a structural
support of the garage. Reinforce the wall or ceiling with a 40
mm (1-1/2") board if necessary. Failure to comply may result
in improper operation of safety reverse system.
You can attach the header bracket either to the header wall (1) or
to the ceiling (3). Follow the instructions which will work best for
your particular requirements.
With the door closed, mark the vertical centre line (2) of the garage
door. Extend line onto header wall above the door.
Open door to highest point of travel. Draw an intersecting
horizontal line (4) on header wall at least 50 mm above high point
to provide travel clearance for top edge of door.
INSTALL THE HEADER BRACKET
12
NOTE: Refer to vertical centre and horizontal lines created in
the previous section for proper placement of header bracket.
A. Wall mount: centre the header bracket (1) on the vertical centre
line (2) with the bottom edge of the header bracket on the
horizontal line (4) (with the arrow pointing toward the ceiling).
Drill and secure the Header Bracket using the most suitable
variation of holes (5). If using the wood screws provided (3)
(item 8 in the Hardware Provided - Section 5), uses a 4.5 mm
pilot drill. If securing to a metal fixture, self tapping "tek" screws
may be more suitable.
B. Ceiling mount: extend vertical centre line (2) onto the ceiling.
Centre the header bracket (1) on the vertical mark no more than
150 mm (6") from the wall. Make sure the arrow is pointing
toward the opener. Drill and secure the Header Bracket using
the most suitable variation of holes (5). If using the wood screws
provided, uses a 4.5 mm pilot drill. If securing to a metal fixture,
self tapping "tek" screws may be more suitable. For concrete
ceiling fixtures, 8 mm wall plugs are provided.
ATTACH RAIL TO HEADER BRACKET
13
Attach the Rail to the Header Bracket
• Position the assembled opener on the garage floor below the
header bracket. Use foam packing material as a protective
base.
NOTE: If the door spring is in the way youʼll need help. Have
someone hold the opener securely on a temporary support to
allow the rail to clear the spring.
• Position the rail bracket against the header bracket.
• Align the bracket holes and secure with the 80 mm clevis pin
and "R" clip (1) item 1 in the Hardware Provided - Section (5)
and (2) (item 2 in the Hardware Provided - Section 5).

INSTALLATION

Header Wall
(50 to 200 mm depending on door type)
8
Unfinished
Ceiling
2
4
Level
(optional)
2
5
5
50 mm
A
1 2
150 mm
(6")
3
1
2
OPTIONAL
CEILING
MOUNT
FOR
HEADER
BRACKET
3
1
Structural
Supports
1
2
3
4
3