Guide Specifications, Compressors, Refrigerant Circuits

Guide Specifications

FORM 201.24-EG1

YORK Model YCWS ______ Packaged Chiller(s). The

(each) unit shall have a cooling capacity of ______ tons

with Compressor kW when cooling GPM of water from

______ °F (°C) to ______ °F (°C) and with ____ GPM of

condensing water entering at ____ °F (°C) and leaving

at _____ °F (°C), and a cooler fouling factor of _____

and condenser water fouling factor of _____. The water

pressure drop shall not exceed ______ feet (kPa) of

water through the cooler and ______ feet (kPa) of water

through the condenser. The unit overall dimensions shall not exceed _____feet (mm) _____ ins. in length, ______

feet (mm) _____ ins. in width and _____feet (mm) _____

in height. The unit operating weight shall not exceed

_____ lbs. (Kg).

GENERAL

The (Each) Packaged Water Cooled Screw Chiller shall be completely factory assembled (in an ISO 9001 regis- tered facility) including all interconnecting refrigerant pip- ing and internal wiring of controls, mounted on a steel base which accommodates the condenser, compressor(s) and evaporator. Operating test shall in- clude operation with water flowing through the evapora- tor.

Unit shall be painted with Caribbean Blue enamel. The unit shall be shipped with a full operating charge of R-

22.The unit shall contain two separate refrigerant cir- cuits, each with a single compressor for standby opera- tion. All units shall be designed and constructed in ac- cordance with the applicable sections of the following: American Society of Heating, Refrigeration and Air Con- ditioning Engineers ANSI/ASHRAE 15 Safety Code for Mechanical Refrigeration: American Society of Mechani- cal Engineers ASME Pressure Vessel Code; National Electrical Code/National Fire Protection Association NFPA 70. The unit shall be produced at an ISO 9001 registered facility. All chillers are rated in accordance with ARI Standard 550/590.

COMPRESSORS

Compressors shall be direct drive, semi-hermetic, ro- tary twin-screw type, including: internal muffler, tempera- ture actuated ‚off-cycle heater, terminal box, internal dis- charge check, discharge and suction shutoff service valves, and precision machined cast iron housing. De- sign working pressure of entire compressor, suction to discharge, shall be 31 bar (450psig).

Motors shall feature refrigerant suction-gas cooled two- pole accessible hermetic compressor motor, full suction gas flow through a mesh screen, with inherent internal thermal overload protection and external current over- load on all three phases. Motor stator shall employ

APT2000 type magnet wire.

Lubrication shall feature external oil separators with no moving or fragile parts, 31 bar (450psig) design working pressure, and UL listing. Refrigerant system differential pressure shall provide oil flow through service replace- able, 0.5 micron, full flow, cartridge type oil filter internal to compressor. Filter bypass, less restrictive media, or oil pump not acceptable.

Compressors shall start at minimum load position. Ca- pacity control range from 100% to 10% of chiller full load using continuous function slide valves, and without hot gas bypass. Step unloading unacceptable. Provide Mi- croprocessor controlled, output pressure regulating ca- pacity control valve to command compressor capacity independent of control valve input pressure and balance compressor capacity with cooling load.

CAPACITY CONTROL SYSTEM

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 ca- pacity to cooling load to 10% of chiller capacity.

COOLER

The cooler shall be a direct expansion shell and tube type with refrigerant in the tubes and liquid to be chilled in the shell. The design working pressure of the cooler shell (liquid) side shall be 150 PSIG for the tube (refrig- erant) side. Refrigerant heads shall be removable. The cooler shall be covered with 3/4" flexible closed cell foam insulation (K = 0.25 maximum) to prevent sweating. The cooler shall be constructed and tested in accordance with ASME Code requirements. Vent and drain connec- tions shall be included. The water connections shall be fully accessible and grooved to accept victaulic couplings if used (by others).

CONDENSER

The condenser is a cleanable thru-tube with steel shell, copper tubes, removable water heads and includes in- tegral subcooling. Refer to PHYSICAL DATA for design working pressures. The shell will be constructed and tested in accordance with section VlII, division 1 of ASME pressure-vessel code. The condenser is equipped with relief valves and will hold the full refrigerant charge for pumpdown.

REFRIGERANT CIRCUITS

Two independent refrigerant circuits will be furnished on

YORK INTERNATIONAL

YCWS specifications

York YCWS, or York Chilled Water System, represents a revolutionary approach to modern commercial cooling solutions, offering efficiency, reliability, and sustainability. Designed specifically for large-scale applications such as industrial facilities, data centers, and office buildings, the York YCWS aims to optimize energy use while maintaining climatic comfort indoors.

One of the standout features of the York YCWS is its advanced chiller technology. Utilizing cutting-edge centrifugal chillers, the system maximizes cooling through a combination of high efficiency and low operational costs. These chillers operate with variable speed drives, allowing them to adjust their output based on the real-time cooling demand. This leads to significant energy savings, especially in fluctuating load conditions, and reduces wear on the equipment, extending its lifespan.

The YCWS also incorporates smart control systems that enhance its overall performance. These controls employ algorithms to anticipate system demands, dynamically balancing the load across multiple chillers and optimizing energy use throughout the day. Integration with building management systems (BMS) allows for seamless communication and remote monitoring, giving facility managers greater oversight and control over their cooling operations.

Sustainability is at the core of the York YCWS design. The system uses environmentally friendly refrigerants that comply with global standards for reducing greenhouse gas emissions. Additionally, the modular design of the chiller units allows for easy upgrades and expansions, accommodating growing cooling needs without necessitating a complete system overhaul. This flexibility supports a more energy-efficient and environmentally responsible operational model.

The system's footprint is relatively compact, allowing it to fit into tighter spaces typically found in urban settings. Furthermore, the YCWS is engineered for quiet operation, minimizing noise disturbances for occupants in and around the building.

Reliability is another key characteristic of the York YCWS. With a focus on durability and performance, these systems are built to function optimally in various environmental conditions. The robust construction and high-quality materials ensure long-term service, reducing the need for frequent maintenance and associated costs.

In summary, the York YCWS is not just a cooling solution but a comprehensive system that embodies modern engineering principles. Its efficiency, sustainability, and adaptability make it a preferred choice for industries looking to invest in their future. With its smart technologies and robust features, the York Chilled Water System is well-equipped to meet the demanding needs of today's commercial cooling challenges.