York MILLENNIUM 28971AR - Manual (Page 4)

YORK INTERNATIONAL 4
Specifications
These YORK air cooled chillers are shipped as a com-
plete factory package. Each unit is completely as-
sembled with all interconnecting refrigerant piping and
internal wiring, ready for field installation:
COMPLETE FACTORY PACKAGE
• Each compressor is installed on its own indepen-
dent refrigerant circuit, which is factory pressure
tested, evacuated, then fully charged with refriger-
ant and oil.
• After assembly, an operational test is performed with
water flowing through the cooler to ensure each cir-
cuit operates correctly.
• Cabinet and base frame are constructed of formed
heavy gauge, galvanized steel.
• All external structural parts are covered with archi-
tecturally neutral “Desert Sand” (Munsell #10YR6-
2) baked-on enamel powder paint. This provides a
finish which, when subjected to ASTM B117, 500
hour, 5% salt spray conditions, shows breakdown
of less than
1 /
8
" either side of a scribed line (equiva-
lent to ASTM D1654 rating of “6”).
• Design is in accordance with applicable sections of
ASME Pressure Vessel Code, NFPA 70 (National
Electrical Code), U.L. and cU.L. Standards , and
ASHRAE/ANSI-15 Safety Code for Mechanical Re-
frigeration.
• Units are Rated and Certified in accordance with
ARI Standard 550/590-98.
• All exposed power wiring routed through liquid-tight,
non-metallic conduit.
SEMI-HERMETIC YORK SCREW COMPRESSORS
• An ideal synergy of expertise, sister division YORK
Refrigeration Compressor Engineers as integral
members on YORK Engineered Systems’ Chiller De-
sign Team, has resulted in a world class compressor
with unequaled performance.
• Continuous function, microprocessor controlled, 3-
way proportional Capacity Control Valve provides
regulated output pressure independent of valve input
pressure for a stable, smooth, and precise match of
compressor capacity to cooling load to 10% of chiller
capacity.
• Automatic spring return of capacity control valve to
minimum load position ensures compressor starting
at minimum motor load. Internal discharge check to
prevent rotor backspin upon shut-down.
• Acoustically tuned, internal discharge gas muffler
eliminates objectionable noise at the source, while
optimizing flow for maximum performance.
• Reliable suction gas cooled, high efficiency, acces-
sible hermetic motor with APT2000 type magnet wire
and redundant overload protection using both ther-
mistor and current overload protection.
• Suction gas screen and serviceable, 0.5 micron full
flow oil filter within the compressor housing.
• Some models equipped with tuned port economizer
as appropriate for enhanced capacity and superior
efficiency.
• Cast iron compressor housing precisely machined for
optimal clearances and superb efficiency. Entire com-
pressor, from suction to discharge has a Design
Working Pressure of 450 PSIG (31 bar).
• 350W compressor body cartridge heater.
CONDENSER SECTION
• Condenser Fans with low noise, full airfoil cross sec-
tion for maximum efficiency, statically and dynami-
cally balanced for low vibration operation, and posi-
tioned in extended, formed steel orifices for low sound
and maximum efficiency.
• Condenser fan motors are high efficiency, direct drive,
6-pole, 3-phase, Class-“F”, current overload pro-
tected, totally enclosed (TEAO) type with double
sealed, permanently lubricated, ball bearings.
• Fin and tube condenser coils of seamless, internally
enhanced, high condensing coefficient, corrosion re-
sistant copper tubes arranged in staggered rows and
mechanically bonded to corrosion resistant aluminum
alloy fins with full height fin collars. Design working
pressure is 450 PSIG (31 bar).
EVAPORATOR
• High efficiency, direct-expansion type cooler with re-
frigerant in tubes and chilled liquid through the baffled
shell. Independent circuits provided for each com-
pressor.
• Design working pressure of the shell waterside is
150 PSIG (10.3 bar), and 350 PSIG (24 bar) for the
refrigerant side. Constructed and tested in accor-
dance with applicable sections of ASME Pressure
Vessel Code, Section VIII, Division (1). Water side
exempt per paragraph U-1, (c), (6). Other codes,
such as German TÜV, also available for global cus-
tomers.
• Water baffles fabricated from galvanized steel to
resist corrosion. Removable heads allow access to
internally-enhanced, seamless, copper tubes. Wa-
ter vent and drain connections included.
• Cooler equipped with thermostatically controlled
heater for protection to -20°F (-29°C) ambient, and
insulated with ¾" (19mm) flexible, closed-cell foam
(k = 0.25).