Pelco Manual C467M-D (5/95) 7
4.3.1.2 Suspended Ceiling Tile
Replacement Mounting
To mount the enclosure into a suspended ceiling grid
where the tile is replaced, perform the following steps.
1. Determine the location for mounting the enclosure
and remove the appropriate ceiling tile.
IMPORTANT: When installing the enclo-
sure in a 2' x 4' ceiling grid, cut the ceiling tile
in half and install an additional “T” rail for
support.
2. Angle the 23.75" back box mounting plate (part
number APSB19, which must be ordered sepa-
rately) through the grid opening and set the plate
into the grid. Attach the back box mount rails with
1/4-20 nuts (provided) to two opposite sides of the
mounting plate (see Figure 2). Use these mount
rails to secure the back box in place so that it can’t
move when inserting or removing the dome drive
unit, and so that all of the weight of the unit is not
on the ceiling tile, per local code.
3. Remove the factory assembled 12.5" round face-
plate from the back box by disengaging the ser-
rated studs.
4. Remove the factory assembled 14.5" square mount-
ing plate by removing the four (4) 1-4/20 bolts.
5. Slide the back box through the mounting plate and
replace the four (4) 1/4-20 bolts and tighten to se-
cure the back box to the mounting plate.
6. Check the alignment of the back box to the mount-
ing plate by attaching the 12.5" round faceplate
trim to the bottom of the back box, aligning the
two studs with two of the holes in the flanges of
the back box and engaging the studs. The studs
should engage, while leaving a very minimal gap
between the ceiling and faceplate trim. Loosen the
1/4-20 hardware in the sides of the back box and
make adjustments as required. Insure that the face
of the back box is level with the ceiling.
7. Attach the lens and camera head to the tilt table (hard-
ware not supplied), if not factory pre-assembled, us-
ing the camera/lens position template supplied as a
guide (see Figure 3). Locate the lens and camera so
that when the notched area in the template is fitted
under the tilt table, the lens and camera do not project
further out from the tilt table than allowed by the
template. Also, the lens must not project higher than
the long end of the template.
NOTE: If the camera and lens do not fit within
the boundaries of the template, they will not fit
inside the dome and need to be replaced with
smaller units.
8. Mount the camera power supply onto the bracket
provided, if not factory pre-assembled. (Screws to
mount the camera power supply and lens are not
provided with the pan/tilt.)
NOTE: For PC1804B and PC900U cameras,
remove the mounting bracket with the two 1/4-
20 threaded holes in it from the camera’s power
supply, align the camera power supply so that
the two (2) threaded holes in the power sup-
ply align over two of the round holes in the
camera power supply bracket on the pan/tilt,
and attach it with the screws provided with
the camera.
9. Hook up camera power, video, and lens with the
connectors supplied, if not factory pre-assembled.
Coil the excess camera cable and tie it down with
tie-wraps to the pan/tilt body.
NOTE: To insert or remove the drive unit from
the back box, the drive unit may need to be ro-
tated 90° so that the wiring cover and/or cam-
era power supply does not interfere with the
side of the back box. If difficulty inserting or
removing the drive unit is experienced, slowly
and gently rotate the drive unit 90°.
10. Engage the connector of the coil cord into the con-
nector of the pan/tilt and attach the safety clamp;
then insert the pan/tilt into the back box, feeding
the coil cord back through the opening in the top
of the back box. Position the pan/tilt in the back
box so that the horizontal studs in the pan/tilt mount
bracket align with slots in the back box mount
bracket. Lift the pan/tilt until it reaches its stop,
then slide it to one side while letting it drop about
1/4 inch (see Figure 4).
11. Attach the dome to the pan/tilt by aligning the two
ball studs protruding through the flange of the dome
with the two holes in the dome attachment brack-
ets and engaging the studs.