Depletion Factor (ODF) of 0.05 or less. The ODF shall be in accordance
with the "Montreal Protocol On Substances That Deplete The Ozone Layer,"
September 1987, sponsored by the United Nations Environment Programme.
PART 2
PRODUCTS
2.1
SELF-CONTAINED WATER CHILLERS
Provide complete, packaged water chillers, each mounted on a single
welded-steel base. Chillers shall be ready for operation after
installation and field testing. Equipment shall operate within capacity
range and speed recommended by the manufacturer. Parts weighing 23 kg 50
pounds or more which must be removed for inspection, cleaning, or repair,
such as motors, gear boxes, cylinder heads, casing tops, condenser, and
cooler heads, shall have lifting eyes or lugs. Provide insulation for
surfaces subject to sweating including the liquid cooler, suction line
piping, water boxes, economizer, and cooling lines. Insulation shall
conform to Section 15080 THERMAL INSULATION FOR MECHANICAL SYSTEMS.
2.1.1
Centrifugal, Helical Rotary, Water-Cooled
**************************************************************************
NOTE: Specify applicable ratio after consulting
current literature to ensure an energy-efficient
system is provided. The ratios specified shall
permit unlimited competition among at least three
manufacturers.
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ARI 550/590. Base capacity and power ratings, at the conditions indicated
and specified, on the test requirements of ARI 550/590. Power input shall
not exceed [_____] kW/kW kW/ton load at full load capacity.
2.1.1.1
Statically and dynamically balanced impellers, either direct or gear driven
by an electric motor. Impeller shafts shall be heat-treated alloy steel.
Shaft main bearings shall be journal type with bronze or babitted liners or
aluminum-alloy, one-piece insert type, or rolling element bearings with an
American Bearing Manufacturers Association L10 life greater than 200,000
hours. Casings of cast iron, aluminum, or steel plate shall have split
sections with gaskets which are bolted or clamped together. Lubrication
systems shall be forced-feed type. An oil pressure differential cutout
interlocked with the compressor starter shall allow compressor to operate
only when required oil pressure is provided. Provide for lubrication of
bearings and shaft seals prior to starting and on stopping with or without
electrical power supply. Speed reducing gears shall be designed to ensure
self-alignment, interchangeable parts, proper lubrication and minimum of
unbalanced forces. Gear box bearings shall be sleeve type. Provide
pressure lubrication with pump and cooler. Gear cases shall be oiltight.
Shaft extensions shall be provided with seals to retain oil and exclude
dust. Compressors shall operate stably and for indefinite periods of time
at any stage of capacity reduction from 100 to 10 percent of full load
capacity.
2.1.1.2
Helical Rotary Compressors
Positive displacement, oil-injected type, and driven by an electric motor.
Rotors shall be solid steel, Society of Automotive Engineers Grade 1141 or
SECTION 15601N
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