Centurion SD04 Installation Manual page 21

Use a long spirit level along the
length of the SDO4 drive rail, and
level out the SDO4, so that it is
running parallel to the ceiling.
Place another 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 should not exceed
300mm.
(Marked as 'A' in Figure 25)
Draw a line on the ceiling joining
these two marks, perpendicular to
the garage door center line made
earlier.
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Spirit level
Spirit level
Drive rail
hanger bolt
Drive rail
hanger bolt
Spirit level
page 21
SDO4
FIGURE 24
Structural
member
of ceiling
SDO4
A
FIGURE 25
Garage door center line
Ceiling
Spirit level
SDO4
FIGURE 26