2.3
ELECTRICAL WORK
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NOTE: Where motor starters for mechanical equipment
are provided in motor-control centers, the
references to motor starters will be deleted.
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Electrical equipment, motors, motor efficiencies, and wiring shall be in
accordance with Section 16402 INTERIOR DISTRIBUTION SYSTEM. Electrical
motor driven equipment specified shall be provided complete with motors,
motor starters, and controls. Electrical characteristics shall be as
shown, and unless otherwise indicated, all motors of 746 kW 1 horsepower
and above with open, dripproof, totally enclosed, or explosion proof fan
cooled enclosures, shall be high efficiency type. Field wiring shall be in
accordance with manufacturer's instructions. Each motor shall conform to
NEMA MG 1 and NEMA MG 2 and be of sufficient size to drive the equipment at
the specified capacity without exceeding the nameplate rating of the motor.
Motors shall be continuous duty with the enclosure specified. Motor
starters shall be provided complete with thermal overload protection and
other appurtenances necessary for the motor control indicated. Motors
shall be furnished with a magnetic across-the-line or reduced voltage type
starter as required by the manufacturer. Motor duty requirements shall
allow for maximum frequency start-stop operation and minimum encountered
interval between start and stop. Motors shall be sized for the applicable
loads. Motor torque shall be capable of accelerating the connected load
within 20 seconds with 80 percent of the rated voltage maintained at motor
terminals during one starting period. Motor bearings shall be fitted with
grease supply fittings and grease relief to outside of enclosure. Manual
or automatic control and protective or signal devices required for the
operation specified and any control wiring required for controls and
devices specified, but not shown, shall be provided.
2.4
SELF-CONTAINED LIQUID CHILLER
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NOTE: Typically, units 500 tons or smaller are
fully assembled and run-tested at the factory.
Units larger than 500 tons are typically shipped and
then assembled, charged, and run-tested in the field.
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Unless necessary for delivery purposes, units shall be assembled,
leak-tested, charged (refrigerant and oil), and adjusted at the factory.
In lieu of delivery constraints, a chiller may be assembled, leak-tested,
charged (refrigerant and oil), and adjusted at the job site by a factory
representative. Unit components delivered separately shall be sealed and
charged with a nitrogen holding charge. Unit assembly shall be completed
in strict accordance with manufacturer's recommendations. Chiller 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. Chiller shall include all customary auxiliaries deemed necessary by
the manufacturer for safe, controlled, automatic operation of the
equipment. Chiller shall be provided with a single point wiring connection
for incoming power supply. Chiller's condenser and liquid cooler shall be
provided with [standard] [marine] water boxes with [grooved mechanical]
[flanged] [welded] connections.
SECTION 15620A
Page 17
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