complete wetting of the coil at all times. Spray nozzles shall be brass,
stainless steel, or high-impact plastic. Nozzles shall be the cleanable,
nonclogging, removable type. Nozzles shall be designed to permit easy
disassembly and shall be arranged for easy access.
2.8.5
Water Pump
The water pump shall be the 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. Pumps shall have cast iron casings. Impellers
shall be bronze, and shafts shall be stainless steel with bronze casing
wearing rings. Shaft seals shall be the mechanical type. Pump casing
shall be factory coated with epoxy paint. Pump motors shall have [open]
[dripproof] [totally enclosed] [explosion proof] enclosures. A bleed line
with a flow valve or fixed orifice shall be provided in the pump discharge
line and shall be extended to the nearest drain for continuous discharge.
Pump suction shall be fully submerged and provided with a galvanized steel
or monel screened inlet.
2.8.6
Drift Eliminator
Eliminators shall be provided to limit drift loss to not over 0.005 percent
of the specified water flow. Eliminators shall be constructed of
zinc-coated steel or polyvinyl chloride (PVC). Eliminators shall prevent
carry over into the unit's fan section.
2.9
UNIT COOLERS
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NOTE: If it is more economical to use one big air
handling unit instead of several unit coolers, use
UFGS-15895 to develop the requirements and delete
the unit coolers. Use UFGS-15950A to develop the
control requirements for the air handling unit.
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Unit shall be [forced circulation] [free delivery] type, factory
fabricated, assembled and tested, and packaged in accordance with ARI 420.
Ammonia systems shall conform to IIAR 2. Fan shall be the [centrifugal]
[propeller] type in accordance with paragraph Fans. Motors shall have
[open] [dripproof] [totally enclosed] [explosion proof] enclosures.
2.9.1
Construction
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NOTE: Coils for fluorocarbon systems will have
copper tubes and aluminum fins. Coils for ammonia
systems will be hot-dip galvanized steel or aluminum.
**************************************************************************
Casing shall be Type 300 stainless steel, aluminum, mill galvanized or
hot-dip galvanized steel after fabrication. Zinc-coated carbon steel shall
be provided with protective coating. Coils shall [be hot-dip galvanized
steel or aluminum.] [have copper tubes and aluminum fins.] Drain pan shall
be watertight, corrosion resistant. Drainage piping for units in spaces
maintained at less than 2 degrees C 35 degrees F shall be insulated.
SECTION 15652A
Page 23
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