Centurion SD04 Installation Manual page 33

Lift the SDO4 to a point where the
control unit (Point B) is in line with
the top of the open garage door
(Point A).
Keeping the control unit in line with
the top of the garage door, place
a spirit level perpendicular to the
ceiling, and line it up with the center
of the drive rail hanger bolt on the
side of the drive rail hanger. Make a
mark on the ceiling, and repeat this
for the other side of the drive rail
hanger.
Ensure that the drive rail
hanger bracket is positioned
directly under a strong
structural member of the
ceiling. If it is not, move
it along the drive rail to
a suitable position before
marking it off on the ceiling.
We recommend that the
maximum cantilever
distance between the
hanger bracket and the
front edge of the control
unit does not exceed
300mm.
(Marked as 'A' in Figure 58)
Draw a line on the ceiling joining
these two marks, perpendicular to
the garage door center line made
earlier.
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Garage door
Point A in line
with Point B
Spirit level
SDO4
Drive rail
hanger bolt
Spirit level
page 33
A B
FIGURE 57
Structural
member
of ceiling
A
FIGURE 58
Garage door center line
FIGURE 59
SDO4
Control
Head
Control
unit
Ceiling
SDO4