York 28971AR manual Specifications, Complete Factory Package, SEMI-HERMETIC York Screw Compressors

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 TÜ V, 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).

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