Merlin MT600 Installation And Operating Instructions Manual page 6

INSTALLATION SECTION
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.
It is recommended that the opener be installed 2,1m (7 feet) or more above the floor where space permits.
12
Position the Header Bracket
The header bracket must be rigidly fastened to a
structural support of the garage. Reinforce the wall or
ceiling with a 40mm (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 centerline (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 5 cm (2") above high point
to provide travel clearance for top edge of door.
13
Install the Header Bracket
NOTE: Refer to vertical center and horizontal lines
created in step 12 for proper placement of header bracket.
A. Wall Mount: Center the header bracket (1) on the vertical
center line (2) with the bottom edge of the header bracket
on the horizontal line (4) (with the arrow pointing toward the
ceiling). Mark all of the header bracket holes (5). Drill
4,5mm (3/16") pilot holes and fasten the header bracket
with wood screws (3).
B. Ceiling Mount: Extend vertical center line (2) onto the
ceiling. Center the header bracket (1) on the vertical mark
no more than 150mm (6") from the wall. Make sure the
arrow is pointing toward the opener. Mark all of the header
bracket holes (5). Drill 4,5mm (3/16") pilot holes and fasten
the header bracket with wood screws (3). For concrete
ceiling mount, use concrete anchors provided.
14
Attach Rail to Header Bracket
Position opener on garage floor below the header bracket.
Use packing material to protect the cover. Raise rail until
holes in the header sleeve and holes in the header bracket
align. Join with clevis pin (1). Insert ring fastener (2) to
secure.
NOTE: To enable the rail to clear sectional door springs, it
may be necessary to lift opener onto a temporary support.
The opener must either be secured to a support or held
firmly in place by another person.
1
4
2
2
1
4
50mm
(2")
A
3
5
3
5
1 2
150mm
(6")
3
B