York MILLENNIUM 28971AR - Manual (Page 97)

YORK INTERNATIONAL
FORM 201.18-EG1
97
Guide Specifications
PART 1 — GENERAL
1.01 SCOPE
A. The requirements of the General Conditions, Supple-
mentary Conditions, Division 1, and Drawings apply
to all Work herein.
B. Provide Microprocessor controlled, twin-screw com-
pressor, air-cooled, liquid chillers of the scheduled
capacities as shown and indicated on the Drawings,
including but not limited to:
1. Chiller package
2. Charge of refrigerant and oil
3. Electrical power and control connections
4. Chilled water connections
1.02 QUALITY ASSURANCE
A. Products shall be Designed, Tested, Rated and Cer-
tified in accordance with, and installed in compliance
with applicable sections of the following Standards
and Codes:
1. ANSI/ASHRAE Standard 15 – Safety Code for
Mechanical Refrigeration
2. ANSI/NFPA Standard 70 – National Electrical
Code (N.E.C).
3. ASME Boiler and Pressure Vessel Code, Sec-
tion VIII, Division 1.
4. ARI Standard 550/590 – Centrifugal and Rotary
Screw Water Chilling Packages.
5. Conform to Underwriters Laboratories (U.L.) for
construction of chillers and provide U.L./cU.L. List-
ing label.
6. Manufactured in facility registered to ISO 9002.
B. Factory Test: Chiller shall be pressure-tested, evacu-
ated and fully charged with refrigerant and oil, and
shall be factory operational run tested with water flow-
ing through the vessel.
C. Warranty: Manufacturer shall Warrant all equipment
and material of its manufacture against defects in
workmanship and material for a period of one year
from date of initial start-up or eighteen (18) months
from date of shipment, whichever occurs first.
1.03 DELIVERY AND HANDLING
A. Unit shall be delivered to job site fully assembled,
and charged with refrigerant and oil by the Manufac-
turer.
B. Unit shall be stored and handled per Manufacturer’s
instructions.
PART 2 — PRODUCTS
2.01 CHILLER MATERIALS AND COMPONENTS
A. General: Install and commission, as shown on the
schedules and plans, factory assembled, charged,
and tested air cooled screw compressor chiller(s) as
specified herein. Chiller shall be designed, selected,
and constructed using a refrigerant with Flammabil-
ity rating of “1”, as defined by ANSI/ASHRAE STAN-
DARD-34
Number Designation and Safety Classifi-
cation of Refrigerants. Chiller shall include, but is not
limited to: a complete system with not less than two
independent refrigerant circuits, semihermetic twin
screw compressors, direct expansion type evapora-
tor, air-cooled condenser, refrigerant, lubrication sys-
tem, interconnecting wiring, safety and operating
controls including capacity controller, control center,
motor starting components, and special features as
specified herein or required for safe, automatic op-
eration.
B. Cabinet: External structural members shall be con-
structed of heavy gauge, galvanized steel coated with
baked on powder paint which, when subject to ASTM
B117, 500 hour, 5% salt spray test, yields minimum
ASTM 1654 rating of “6”.
2.02 COMPRESSORS AND MOTORS
A. Compressors: Shall be direct drive, semihermetic,
rotary twin-screw type, including: internal muffler, tem-
perature actuated ‘off-cycle’ heater, rain-tight termi-
nal box, internal discharge check, discharge and
suction shut-off service valves, and precision ma-
chined cast iron housing. Design working pressure
of entire compressor, suction to discharge, shall be
450 PSIG (31 bar). Compressor shall be U.L. listed.
B. Motors: Refrigerant suction gas cooled two-pole ac-
cessible hermetic compressor motor, full suction gas
flow through 0.006" maximum mesh screen, with in-
herent internal thermal overload protection and ex-
ternal current overload on all three phases. Motor
stator shall employ APT2000 type magnet wire.
C. Lubrication: External oil separators with no moving
or fragile parts, 450 PSIG design working pressure,
and UL listing. Refrigerant system differential pres-
sure shall provide oil flow through service replace-
able, 0.5 micron, full flow, cartridge type oil filter in-
ternal to compressor. Filter bypass, less restrictive
media, or oil pump not acceptable.
D. Capacity Control: Compressors shall start at mini-
mum load position. Capacity control range from 100%
to 10% of chiller full load using continuous function
slide valves, and without hot gas bypass. Step un-
loading unacceptable. Provide Microprocessor con-
trolled, output pressure regulating capacity control