1 Product Manual PM WSCWDC-2. Group: chiller Date: October 2002. Supersedes: PM WSCWDC-1. Centrifugal Compressor Water Chillers THE DISTINCTION SERIES . Model WDC, Dual Compressor , 160 to 2700 Tons (560 to 9500 kW). Model WSC, Single Compressor , 80 to 1300 Tons (280 to 4550 kW). HFC 134a, The Global Refrigerant of Choice 2001 McQuay International Table of Contents 3 Unit Selection ..27. Customer 4 chiller Identification ..29. Wide Choice of Capacities and 4. Physical Data and Weights ..30. Dual Compressor Design .. 5. Variable Frequency 6 Evaporator .. 30. HFC-134a: .. 6 31. Compressor 8 32. Compact 12 Relief Valves .. 32. Heat Exchangers .. 13 Refrigerant Recovery 33. Lubrication 13 SurgeGard .. 14. Chillers .
2 34. Pumpdown .. 14. Marine Water Boxes (WSC) .. 44. Thermal Expansion 14. Marine Water Boxes (WDC).. 45. Factory Performance 15. Weights .. 46. McQuayService 15. WDC Design Features .. 16 Electrical Data ..48. Control Power .. 53. Industry Leading Efficiency .. 16. The Redundancy Feature .. 16 Motor Part Load Efficiency .. 18. Lower Installed Costs .. 18 Variable Frequency Drives ..57. Bolt Together Construction .. 18. WDC chiller Controls .. 19 Application Considerations ..61. Oil Coolers .. 63. Control 20. BACdrop 21 Options and Building Management Systems .. 22. Multiple Machine Control .. 22. Specifications ..68. Sound .. 25. (Cover picture: Model WDC 126, 2300 ton dual Compressor chiller ). Our facility is ISO Certified Initial Issue September, 1998.
3 "McQuay" is registered trademarks of McQuay International . 1996 McQuay International Data and illustrations cover McQuay International products at the time of publication and we reserve the right to make changes in design and construction at anytime without notice. 2 Product Manual PM WSC/WDC-2. Introduction THE DISTINCTION SERIES. As a result of extensive research and development efforts on both heat transfer and Compressor components, McQuay will enter the 21st century with a new generation of Centrifugal Chillers . So advanced that they have been given a new model designation, WSC. for single and WDC for dual Compressor units. Their new name, the DISTINCTION . SERIES , was deemed highly appropriate. DISTINCTION is defined as: Excellent in performance Recognition of superiority The fact of being different FEATURES BENEFITS.
4 Available with Variable Frequency Drive Provides superior efficiency in many (VFD) applications. Industry leading efficiency when teamed with Dual Compressor Chillers Alternative refrigerant leadership- Complete The confident choice for the future-Positive HFC-134a Centrifugal chiller line pressure-Environmentally safe -Non-toxic- Dual compressors available up to 2,700 tons- Lower annual energy cost than any single (9500kW) Two of all mechanical and Compressor chiller - Dual Compressor electrical components reliability Small footprint New generation MicroTech Control A complete chiller plant controller-Open protocol-Loaded with customer benefits-See detailed specification Bolt together construction at tube sheets Easy disassembly and re-assembly at the job site for those difficult retrofit installations Pumpdown capability-Entire charge can be Eliminates the need for a separate pumpout stored in the condenser vessel in most situations Small footprint Optimizes equipment room space Units performance tested in the factory to job Factory testing assures trouble free startups conditions.
5 Within established limits and reliable operation Over 30 years of product refinement and Insures consistent quality for long, trouble- factory ISO Certification free operation Certification Full ARI 550/590 participation and certification has been an on-going commitment at McQuay International. The ARI label affixed to certified units certifies that the unit will meet the specified performance. This equipment is certified in accordance with ARI Standard 550/590, latest edition, provided the application ratings are within the scope of the certification program. The program excludes the following applications: air and evaporative cooled Chillers , capacity exceeding 2000 tons (7000 kW) on 60 hertz service, voltages above 5000 volts, brine and special fluids other than Water and heat recovery units.
6 The capacity range for 50 hertz is 200. to 1,000 tons (700 to 3500 kW). Product Manual PM WSC/WDC-2 3. Customer Benefits Wide Choice of Capacities and Efficiencies The range of capacities and chiller types shown in the following chart gives the plant designer the ability to pick and chose the exact capacity and optimum chiller type and efficiency for either a single or multiple unit chiller plant. This flexibility is also a tremendous asset for replacement chiller applications. McQuay Offers the Widest Choice of ARI Certified, Ozone Safe Centrifugal Chillers TONS 0 500 1000 1500 2000. Single Compressor Chillers Single Compressor with VFD. Dual Compressor Chillers Dual Compressor with VFD. Variable Speed Water Flow Tower Economizer Cycle NOTE: ARI limit for certification on 60 Hz service is 2,000 tons.
7 McQuay dual Compressor Chillers with or without VFD. are available up to 2,700 tons. The chart below illustrates the relative IPLV efficiencies of various McQuay options for a 500 ton selection. The chiller cost increases as the efficiency improves. Industry Leading Efficiencies (kW/Ton)..6..505..5. IPLV..403..4..365..337..3. WSC WDC WSC w/VFD WDC w/VFD. Notes: WSC = Single Compressor Centrifugal chiller WDC = Dual Compressor Centrifugal chiller VFD = Variable Frequency Drive The IPLV values are ARI Certified Ratings based on ARI Standard 550/590-1998, Standard for Water Chilling Packages Using the Vapor Compression Cycle. Full load at 44qF chilled Water temperature with gpm/ton, 85qF condenser Water temperatures with 3 gpm/ton.
8 Part load points of 75%, 50%, and 25% employing condenser Water temperature relief per the standard. Be wary of competitive efficiency claims at other than standard conditions. 4 Product Manual PM WSC/WDC-2. Dual Compressor Design Dual Compressor Chillers Offer Better Efficiency, Lower Installed Costs, Less Floor Space, and Higher Reliability Than Single Compressor Designs AND NOW with Variable Frequency Drive (VFD) for Industry Leading IPLV. Efficiency Note: Building part load data directly from a major manufacturer's load and energy program Most buildings operate at their full design cooling load for only a few hours a year, yes, hours. In fact some buildings, schools for example, may never run at full design load.
9 Except for some electrical demand considerations, why be concerned about a chiller 's full load kW/ton (COP) at all? The real question should be "what does it cost to run the chiller in my building, at my loads, and my power costs?". The answer to this question is in the part load efficiency of the chiller -and no chiller can do as well as the McQuay Dual Centrifugal . These Chillers excel when it comes to operating efficiency in the five percent to sixty percent capacity range-where 70 percent of the annual operating occur in most buildings. The building part load curves shown above are from detailed energy studies performed on various building types. See page 16 for a comprehensive discussion of dual Compressor advantages.
10 Product Manual PM WSC/WDC-2 5. Variable Frequency Drive Efficiency: Variable frequency drive is a technology that has been used for decades to control motor speed on a wide variety of motor drive applications. When applied to Centrifugal Compressor motors, significant gains in Compressor part load performance can be realized. The improvement in efficiency and reduction of annual energy cost is maximized when a there are long periods of part load operation combined with low Compressor lift (lower condenser Water temperatures). This operating scenario will offset the small VFD full load power penalty. Combining the attributes of VFD drives and the extremely efficient McQuay WDC Dual Centrifugal chiller produces the industry's most efficient chiller based on the all important IPLV value.