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Marley
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MCW Cooling Tower
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Specifications: Options
33
■ Where a tower is installed in a building well or there are high sur-
rounding walls it is possible that a proportion of the hot and humid
discharge air will be drawn back into the fans thus increasing the inlet
wet bulb temperature with detriment to the tower performance.
The tapered discharge duct is intended to increase the exit velocity
by up to 70% in order to reduce the effects of recirculation in some
installations. Experience and sound judgement should be exercised to
determine when and if a duct is required.
If the surrounding walls are much higher than the tower discharge
height then extensions to the tapered duct may be installed.
Premium Efficiency Motor:
6.3 Replace paragraph 6.3 with the fol-
lowing: The fan and fan drive assem-
bly for each cell shall be supported
by a rigid, welded, hot dip galvanized
steel structural support that resists
misalignment. The mechanical equip-
ment assembly shall be warranted
against any failure caused by defects
in materials and workmanship for no
lessthanfive(5)yearsfollowingthe
date of tower shipment. This warranty
shall cover the fan, speed reducer,
motor, drive shaft and couplings, and
the mechanical equipment support. The
bearing assemblies and V-belts shall be
warranted for 18 months.
Discharge Hood:
6.4 Add the following paragraph to the
Mechanical Equipment Section: There
shall be a galvanized steel tapered duct
on the discharge side of the tower.
Drift eliminators shall be repositioned
into the lower section of the duct.