Better ecology, Better economy. Air Cooled Screw …

1 FORM (803). Better ecology , Better economy . Air Cooled Screw liquid Chillers (STYLE G). 28971AR. R-407C Optimized 260 kW 1200 kW. 50 Hz Table of Contents Accessories and Options ..8. Temperatures and Cooler Water Pressure Drop (SI Units)..12. Ratings R-407C Physical Data R-407C Dimensions YCAS0295EB - Dimensions YCAS0425EB -YCAS0575EB ..24. Dimensions Dimensions Dimensions YCAS0775EB - Dimensions Dimensions YCAS1065EB - Operating Weights Aluminum Fin Condenser Operating Weights Copper Fin (Or Aluminum Fin with Optional ..38. Operating Weights Copper Fin with Optional Silencer Isolator Electrical Electrical Power Connection Typical Control Application Guide NOMENCLATURE.)

2 The Model Number denotes the following characteristics of the unit: YC A S 0375 E B 50 Y G. YORK chiller Design Series YC = YORK chiller Type Start Y = Star (WYE)-Delta Air- Cooled X = Across-the-Line Compressor Type S = Screw Voltage Code 50 = 380/415-3-50. Nominal Capacity (kw). Unit Designator E = High Efficiency Refrigerant B = R-407C. 2 YORK INTERNATIONAL. FORM Introduction YORK Air Cooled Screw liquid Chillers R- 407C Optimized 28971AR. The YORK eco2 technology takes the YCAS Air Cooled Screw Chillers yet another step beyond the competition. Using unique (patent pending) heat transfer design, the eco2 chillers exploit the special glide characteristic of HFC refrigerant R-407C, resulting in excellent performance from a machine using a zero ozone depletion refrigerant.

3 These Air Cooled Screw Compressor machines are the state-of-the- art in air Cooled chillers, providing chilled fluids for all air conditioning applications. Completely self-contained and designed for outdoor installation, they employ low noise, energy efficient, serviceable, semi-hermetic Screw compressors designed and manufactured specifically for this new product line. These compressors, with reliable twin- Screw technology, are ideally matched to evaporators and condensers optimally configured for superior heat transfer and unit efficiency. Condenser coils are arranged to maximize air flow using full airfoil, high efficiency, low noise fans driven by low energy motors.

4 The Screw compressors, high efficiency evaporator, enhanced heat transfer condensers, and weather tight power and microprocessor control centers are mounted on a bolted, fully galvanized and powder painted, all steel base, for unsurpassed reliability and performance. YORK INTERNATIONAL 3. Specifications These YORK air Cooled chillers are shipped as a evaporated in the tubes, and water flowing over the complete factory package. Each unit is completely as- tubes inside the shell), and Flooded (refrigerant boil- sembled with all interconnecting refrigerant piping and ing in a pool' in the shell, and water inside the tubes). internal wiring, ready for field installation, including: are terms used to describe typical chiller evaporator heat exchangers.

5 While flooded designs are easily employed on indoor equipment, DX is preferred on HFC REFRIGERANT R-407C: air- Cooled equipment for Better refrigerant and oil R-407C has outstanding properties which make it the management across the broad range of ambient superior HFC refrigerant for air Cooled chillers. conditions, resulting in greater application flexibility R-407C is an HFC (hydrofluorocarbon). HFCs have and system reliability. zero ODP (ozone depletion potential) because they EVAPORATOR: contain no chlorine to damage the ozone layer. YORK's special eco2 Counter-Flow' heat exchanger R-407C achieves low total global warming impact in design takes advantage of the Glide characteristic YORK's eco2 air Cooled chillers.

6 Direct effect GWP intrinsic to HFC R-407C. It employs technologically (Global Warming Potential) assumes refrigerant is al- advanced (patent pending) high efficiency tube as- lowed to leak into the atmosphere. Refrigerants suit- semblies which make possible a single refrigerant able for air Cooled chillers have similar GWPs, and the pass, DX type cooler that is Better than a flooded slight differences are not significant when evaluating cooler; delivering refrigerant suction gas warmer than TEWI (Total Equivalent Warming Impact). Instead, the the leaving chilled water at full load. CO2 and rejection heat from utilities generating elec- tricity to run the machines account for 98% to 99% of Independent circuits provided for each compressor.

7 TEWI over the typical life of a chiller . Therefore, the Design working pressure of the shell waterside is critical issue is energy efficiency. The YORK eco2 air Cooled chillers have excellent energy efficiency. Temperature ( C). R-407C is safe and chemically stable. R-407C is Water listed in ASHRAE Standard-34 Number Designation and Safety Classification for Refrigerants as an A-1 . refrigerant; lowest toxicity, non-flammable. R-407C is similar to R-22. Though there are many refrigerants, HFC R-407C retains many of the fine properties of HCFC R-22, the venerable work-horse' Water In Water Out refrigerant of air- Cooled DX chillers for decades, but Refrigerant Out Refrigerant In with no chlorine.

8 In fact, the pressures, temperatures, and heat transfer characteristics of R-407C are so LD04906. similar to R-22, it has been applied for years as a drop-in' alternative in machines originally designed Bar (150 PSIG), and Bar (350 PSIG) for the re- for R-22. frigerant side. Constructed and tested in accordance with applicable sections of ASME Pressure Vessel R-407C has Glide, which benefits performance. Glide Code, Section VIII, Division (1). Water side exempt describes the property of a refrigerant boiling across a per paragraph U-1, (c), (6). temperature range at a given pressure (it is zeotropic), Water baffles fabricated from galvanized steel to rather than at a single temperature (azeotropic).

9 R- resist corrosion. Removable heads allow access to 407C is a blend of three constituents (23% R-32, 25%. internally-enhanced, seamless, copper tubes. Water R-125, and 52% R-134a) and is zeotropic. At typical vent and drain connections included. water chiller evaporator pressures, R-407C has about C (8 F) of glide. While placing a refrigerant with Cooler equipped with thermostat controlled heater glide into a machine designed for an azeotropic refrig- for protection to -29 C (-20 F) ambient, and in- erant (no glide, like R-22) typically diminishes chiller sulated with 19mm (3/4") flexible, closed-cell foam performance, the YORK eco2 machine exploits glide (k = ).

10 To achieve exceptional energy efficiency. SEMI-HERMETIC YORK Screw COMPRESSORS: R-407C is a good DX refrigerant, well suited to air Cooled chillers. DX, or Direct Expansion (refrigerant Continuous function, microprocessor controlled, 3- way proportional Capacity Control Valve provides 4 YORK INTERNATIONAL. FORM regulated output pressure independent of valve input system piping brazed joints as compared to designs pressure for a stable, smooth, and precise match of that use fittings, resulting in a highly reliable and leak compressor capacity to cooling load to 10% of chiller resistant system. capacity. liquid line components include: manual shut-off valve Automatic spring return of capacity control valve to with charging port, high adsorption removable core minimum load position ensures compressor starting filter-drier, solenoid valve, sight glass with moisture-in- at minimum motor load.)