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Guide specs FORM -EG Model CYK Compound Centrifugal Liquid Chillers Design Level G Through TONS Through kW Utilizing HFC- a Table of Contents FORM -EG Introduction Mechanical Speci ?cations Accessories and Modi ?cations Application Data Overall Chiller Ar

FORM -EG Model CYK Compound Centrifugal Liquid Chillers Design Level G Through TONS Through kW Utilizing HFC- a Table of Contents FORM -EG Introduction Mechanical Speci ?cations Accessories and Modi ?cations Application Data Overall Chiller Arrangement Compact Nozzle Arrangements Marine Nozzle Arrangements Guide Speci ?cations SI Metric Conversion NOMENCLATURE JOHNSON CONTROLS Introduction The YORK Compound YK Chiller is a design using two centrifugal compressors arranged in series to handle radiator-cooled brine- chilling and heat-pump applications at conditions outside the range of typical centrifugal chillers These custom units use HFC- a refrigerant and are available in a wide range of capacities ? For air-cooled applications air- cooled radiators to tons at F LWT and up to F LCWT to kWR at C LWT and up to C LCWT ? For brine chilling to tons at F LBT and F LCWT to kWR at - C LBT and C LCWT Brine temperatures as low as F - C can be achieved ? For heat pump applications to MBH to kWR heat rejection STANDARD COMPONENTS Each compound chiller employs common parts instead of a one-of-a-kind design The compressors and heat exchangers use standard technology proven in the successful YORK packaged chiller line Each compressor is driven by a standard open-drive electric motor COMPACT FOOTPRINT Compressors and motors are mounted above the shells to assure the smallest footprint for this type of chiller GREATER ADAPTABILITY With the compound chiller the impeller diameter width and speed can be optimized for each stage of compression based on operating conditions SUPERIOR PART-LOAD PERFORMANCE Using a compound arrangement allows the use of pre- rotation-vane PRV capacity control for the centrifugal impellers of both compressors Pre-rotation vanes act like a throttle on the suction side of the compressor to control compressor load With PRV control on both compressors the result is better part-load performance than for typical multistage compressors HANDLES VARYING CONDENSING CONDITIONS Since chillers most often operate at o ?-design conditions o ?-design performance is a major factor in the energy saving equation A compound chiller can operate with a wider range of condensing water temperatures than typical chillers The compound unit allows one compressor to be shut o ? so the chiller can run on just one compressor during low head conditions This practice not only ensures system stability it allows the chiller to run more e ?ciently and takes advantage of cooling water temperatures well below design JOHNSON CONTROLS FORM -EG Lower inrush current Instead of starting a single large motor the compound chiller stagger-starts the motors in sequence Consequently peak inrush current is reduced to about compared to starting a motor for a single large compressor Lower sound levels Acoustically with compound compressors sharing the workload compressor RPMs are lower than in standard centrifugal designs ?? and lower RPMs help lower sound levels Graphic control A powerful graphic control panel makes chiller operation easy Startup is handled by a push of the button there is no need for manual intervention in the staggered-start sequence of