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General
1. Optional discharge accessories such as tapered hoods, positive
closure dampers, discharge sound attenuators and/or access
plenums can be fitted.
2. Rigging method of optional accessories is indicated in the
rigging tables (see section "Rigging).
3. Never assemble the unit before lifting, as the lifting devices
provided are not designed to support the weight of the entire
assembled unit.
4. Refer to the unit certified drawing for installation sequence of
optional accessories.
5. Position the lower section on the supporting steel and bolt in
place.
6. Remove any protective wood from the top horizontal flanges of
the lower section. Wipe down the flanges to remove dust, dirt or
moisture that may have accumulated during shipment and
storage.
7. Apply the 25 mm flat tape sealer around the periphery of the top
flange of the lower section.
This tape sealer must be centred directly over the centreline of
the tapper holes and on the centreline of the end flanges where
there are no tapper holes. The sealer is to be spliced only along
the flanges with tapper holes. When it is necessary to splice
sealer, mitre and press the two ends together so as to form a
smooth, continuous bead. Tape sealer is trapezoidal in shape
and must be installed wide side down (see Figure "Installation of
tape sealer"). Do not stretch sealer tape.
8. Sealer applied to the end flanges of the unit must be continuous.
Figure 2: Installation of tape sealer
1. Upper section; 2. Lower section; 3. Lower section frame; 4. 25 mm flat
tape sealer laid over punch line wide side down.
9. Remove the skid from the upper section. Lift the upper section
and position it over the lower section so that the flanges of the
upper section are about 50 mm above the lower section. Dot not
let the upper section swing and damage the sealer.
Using at least four drift pins (see figure) in the fastening holes
located on the long sides of the sections to align the top section
to the bottom section. To avoid incorrect alignment, refer to the
below drawing for the position of the fastening holes to be used.
Use additional drift pins in the middle of the unit if required, to
align long panels. Make sure all holes from upper section and
lower section are properly aligned before lowering the top
section completely to the bottom section.
OPTIONAL ACCESSORIES ASSEMBLY
Figure 3: Position of the fastening holes to be used.
1. Fastening hole; 2. Drift pin position; 3. The distance between the fastening
hole in which the drift pin is inserted and the corner should be at least 30 cm;
4. Usage of additional drift pin for long sides.
Figure 4: Usage of drift pin to align the screw holes
10. Using the self-tapping screws, drive screws down through the
upper section and into the lower section. Start next to lifting ear
towards centre of unit. Continue to install the screws using the
drift pin to align the screw holes until all holes are filled with
screws
Bleed line installation
On all open cooling towers, install a bleed line with valve between
the system circulating pump discharge riser and a convenient drain.
Locate the bleed line in a portion of the riser piping that drains when
the pump is off. Closed circuit cooling towers or condensers that are
furnished with a factory installed circulating pump include a bleed
line with valve.
The bleed valve should always be open when the unit is in operation,
unless the bleed rate is automatically controlled by a water
treatment system. Recommended bleed rates may be found in the
Operating and Maintenance Manual.
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