LiftMaster SD Industrial-Duty Door Operator for Single and Bi-Parting Doors - Manual (Page 6)

6
OPERATOR MOUNTING
NOTE: Refer the figures on page 2 for general
information during this part of the installation.
1. Determine the clearance necessary for the door to
pass between the powerhead and wall (see figure 6).
This dimension must be less than 4 inches, it may be
necessary to shim the brackets out from the wall
accordingly.
2. With the door fully closed, locate the vertical
center-line of the door and mark this line on the wall
above the door. Measure 18” to the left of this line if
the door slides left to close or 18” to the right of this
line if the door slides right to close (see figure 1).
NOTE: For bi-parting doors, omit this step. The
track should extend 3-1/2 feet beyond the door
opening (see figure 2).
3. Set the assembled operator into position and mark
the holes for the angle mounting brackets on the wall,
as low as possible without interfering with door travel
(see figure 6). Drill holes in the wall for mounting.
Through-bolts are recommended for this purpose. If
wall construction does not permit the use of through-
bolts, lag bolts and shields may be used.
4. Secure the assembled operator to the wall.
IMPORTANT: BE SURE OPERATOR, TRACK AND
DOOR TRACK ARE PARALLEL.
Check that the door clears the power head when
moving. Adjust the track hangers on the mounting
brackets to the desired position and tighten all bolts.
It is recommended that at least one sway brace be
used (not provided) between the wall and one of the
track hangers for increased rigidity, especially on
large or heavy doors.
5. Mount the door disconnect mechanism on the
center-line of the door so that the top of the bracket is
no more than 1-1/2” below the slider carriage (see
figure 6). This mechanism may be adjusted both
front to back and up and down to align the disconnect
pin. It may be necessary to shim between the
mechanism and the door to bring the pin out into the
center-line of the track.
NOTE: For bi-parting doors, mount each door
disconnect mechanism centered on a line 24” from
the door edge (see figure 2).
6. Move the door so that the disconnect pin is
directly aligned with the hole in the carriage and
engage pin in hole.
DOOR DISCONNECT MECHANISM
SCREW COLLAR
1-1/2” MIN.
SLIDER CARRIAGE
1” MIN.
4”
MAX.
POWER HEAD CLEARANCE
FROM WALL
ANGLE BRACKETS SHOULD NOT
INTERFERE WITH DOOR TRAVEL
BOTTOM OF TRACK
TOP OF DOOR
6-1/4” MAX.
FIGURE 6