2.5.6.3
Fans
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NOTE: When the density of the ambient air to be
handled by the fans differs substantially from the
density of the standard air value of 1.2 kg per
cubic m (0.075 pound per cubic foot) at 21 degrees C
(70 degrees F) and 101 kPa (29.92 inches mercury),
the density of the air and/or the elevation above
mean sea level will be stated.
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Fans shall be centrifugal or propeller type as best suited for the
application. Fans shall be direct or V-belt driven. Belt drives shall be
completely enclosed within the unit casing or equipped with a guard. When
belt drive is provided, an adjustable sheave to furnish not less than 20
percent fan-speed adjustment shall be provided. Sheaves shall be selected
to provide the capacity indicated at the approximate midpoint of the
adjustment. Fans shall be statically and dynamically balanced. Fan motor
shall be totally enclosed type or open dripproof and located within an
enclosure to be fully protected from the weather.
2.5.6.4
Water Section
Water eliminators shall be constructed of nonferrous metal, of an approved
nonmetallic material, or of not lighter than 0.6 mm (24 gauge) 24 gauge
steel, hot-dip galvanized after fabrication. Spray nozzles shall be brass
nonclogging type designed to permit easy disassembly, and shall be arranged
for easy access. Water pump shall be bronze-fitted centrifugal or turbine
type, and may be mounted as an integral part of the evaporative condenser
or remotely on a separate mounting pad. Pump suction shall be fully
submerged and provided with screened inlet. Water pan or sump shall be
constructed of not lighter than 1.8 mm (14 gauge) 14 gauge steel, hot-dip
galvanized after fabrication, or molded acid-resistant
glass-fiber-reinforced polyester. Water distribution pan shall be
constructed of not lighter than 1.6 mm 16 gauge steel, hot-dip galvanized
after fabrication. Joints shall be watertight. Water pan or sump shall be
provided with drain, overflow, and make-up water connection with stop valve
and float valve. A bleed line with a flow valve of the needle type sized
for the flow required or fixed orifice shall be provided in the pump
discharge line and shall be extended to the nearest drain for continuous
discharge.
2.6
CHILLER COMPONENTS
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NOTE: Coordinate the type of chiller components
required with the type of chiller specified in the
previous paragraphs. Components define under this
paragraph do not apply to absorption type chillers.
Delete this paragraph if only absorption type
chillers are specified.
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2.6.1
Refrigerant and Oil
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NOTE: Non-absorption type chillers shall operate on
SECTION 15620A
Page 23
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