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Page D.29

Doc. No. PC140/11.01/GB

York Water Cooled Chillers (YNWS) andRemote Condenser Chillers (YNRS) area compact design suitable for chilledwater or water/glycol cooling. They aredesigned to be located inside a plantroom.

YNWS Chillers require a cooling toweror dry cooler for heat rejection.

YNRS Chillers require an air cooled orevaporative condenser for heat rejection.

YNWS MILLENNIUMWATER COOLEDCHILLER

YNRS MILLENNIUMREMOTE CONDENSERCHILLER

R717 REFRIGERANT

COOLING CAPACITIES472 KW TO 1760 KW

CONTENTSYNWS and YNRS Features

Specification

Accessories and Options

ISN Millennium Control Centre

Application Data

YNWS Refrigerant Flow Diagram

YNRS Refrigerant Flow Diagram

Identification

Electrical Data

Electrical Connections

Operating Limitations

Technical Data

YNWS Dimensions and Weight

YNRS Dimensions and Weight

Neoprene Isolators

Spring Isolators

Available Motors

Solid State Starter (Optional)

Starter Panel (Optional)

FEATURESFactory certified to EN/ISO 9001.

High full load and part load efficiency.

Operates at low condenser water temperatures (YNWS).Cooling Tower bypass not required.

Open drive motor.Mixed-matched components.

Industrial type screw compressor.

Refrigerant R717.

Microprocessor control with visual display oftemperatures, pressures, slide valve position, motorcurrent, operating hours and number of starts.

Unit remote alarm contacts.

Optional remote water temperature and current limitreset.

Building Management Interface.

Small ammonia charge.

CE Mark.

BENEFITSHigh standard of quality control.

Low operating costs at all load conditions.

Reduced energy costs during winter andcapital cost savings.

More efficient than refrigerant cooled motor.

Satisfies exact capacity/energy requirements.

Long life reliability.

Zero ozone depletion value. Zero globalwarming impact.

System data logging and temperature resetcapability.Fault diagnostics.Energy management.

Warning notification.

To improve operating efficiency.

For central data logging and single pointsystem monitoring and control.

Safe use.

For all European Market.

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AVAILABLE MODELS & NOMINAL COOLING CAPACITIES TABLE 1

Doc. No. PC140/11.01/GB

Page D.30

York Millennium Rotary ScrewCompressor Chillers are computerselected to custom-match individualbuilding load and energy requirements.

Matched Components MaximizeEfficiencyA large number of standard heatexchangers and pass arrangements, as wellas compressor and motor options, areavailable to provide a componentcombination that can achieve the requiredcapacity and lowest full and part loadenergy consumption at the specifiedoperating conditions.

Screw Compressor ReliabilityThe rotary screw compressor is designedand manufactured by the York company"Frick" and has a proven dependability inthousands of demanding industrialrefrigeration and gas compressionapplications since the early 1980's. the York-Frick combination has been applied to airconditioning systems worldwide.

Superior Low Load CapabilityThe Millennium chiller can operate easilyand efficiently from 100% capacity to 10%.The key is a compressor design whichprevents oil from leaking into suction line,regardless of refrigerant gas velocity.Most screw compressors cannot unloadbelow 25% to 30% of full load capacity,seriously impairing their low load efficiency.These designs utilise bottom suction inletsand require a high refrigerant gas velocityto prevent oil from dropping into the cooler.

Slide-Valve Design Reduces WearThe method used to support the capacity-controlling slide valve of a screwcompressor can have an important impacton reliability. The Frick compressor has aslide valve built long enough to extendbeyond the rotor housing, where thedischarge housing supports the valve fromunderneath. This design means that thevalve is kept within a very close tolerancewith the spinning rotors, yet never allowedto touch them.

Motor Burn-out Problems solved withOpen DriveHermetic motor burn-out can cause seriousdamage to a chiller, due to the systemcontamination by motor winding debris. Theentire chiller has to be cleaned and therefrigerant replaced. The motor usually hasto be returned to the factory for repair. Thisrisk is eliminated by using air cooled motors,which have no direct connection to therefrigerant system and being of standarddesign, can be rewound locally.

Electronic Starting - Smooth andReliableThe electronic design of the optional YORKSolid-State Starter provides the mostreliable motor starting system availabletoday. Compare this to old-fashioned electro-mechanical starters, with mechanicalcontactors and linkages that corrode orweld together.The Solid-State Starter also improves chillerreliability. By "soft starting" the motor, itminimizes the damaging effects of suddencurrent inrush on the motor/compressordriveline.

Take Advantage of Colder CoolingTower WaterYORK Millennium chillers have beendesigned to take full advantage of coldercooling-tower water temperatures which arenaturally available during off-peak hours.Considerable energy savings are availableby allowing the tower water temperature todrop, rather than artificially holding it at 20to 24C as required by some chillers.

Oil Management SystemScrew compressors use oil to seal themeshing rotors for efficient compressionand to cool the mating parts. Much of thisoil becomes entrained in the refrigerant gas.If it is not removed, it will become trappedin the heat exchangers, robbing thecompressor of critical lubrication andwasting energy.The Millennium screw chiller uses a time-proven two-stage oil separator, removingthe oil by gravity dropout and by mesheliminators.

Oil Reservoir Positioned for ConstantLubricationA compressor must have adequatelubrication during start-up and shutdown,or it may seize. Less advanced designsdepend only on residual oil clinging tocompressor surfaces to provide lubrication.The Frick screw compressor leaves nothingto chance. An oil reservoir located at rotor-bearing level ensures proper lubricationduring start-up and shutdown.

Open Drive Motor BenefitsThe compressor drive-line has a closecoupled open drive air cooled electric motor.

More Efficient than Hermetic MotorThe Millennium close coupled open drivedesign reduces energy consumption by 3%to 6% compared to a semi-hermeticrefrigerant cooled motor. Air cooled motorseliminate heat rejection into the chillersystem providing the same cooling capacityfor less motor power. Air offers lessresistance to motor rotation than refrigerantresulting in higher operating efficiency.

SLIDEVALVE

SUPPORTAREAS

SUPPORTAREAS

ROTOR HOUSING

DISCHARGEPORT

DISCHARGE HOUSING

YNWS AND YNRS FEATURES

FIGURE 2

The York slide valve extends beyond the rotorhousing to where the discharge housing cansupport the valve from underneath, providingsecure positioning and close tolerances.

The Millennium rotary screw compressor offersa greater unloading range because oil cannotdrop into the cooler at low loads.

OIL INJECTION

REFRIGERANTGAS

TOPSUCTION

OIL

FIGURE 1

Reliable YORK open-drive motor designeliminates the possibility of a hermetic motorburn-out, a catastrophic failure which maycontaminate an entire chiller system.

FIGURE 3

The YORK Solid-State Starter provides efficient,reliable motor operation.

FIGURE 4

Page D.31

Doc. No. PC140/11.01/GB

GeneralThe YORK Millennium Rotary Screw Chilleris completely factory packaged includingcooler, condenser, oil separator,compressor, motor, lubrication system, ISNMillennium Control Centre, and allinterconnecting unit piping and wiring. Theunit is supplied with nitrogen gas pressure.Ammonia and miscible oil charge issupplied in container.

CompressorThe rotary twin screw compressor has beenengineered and constructed to meet theexacting requirements of the industrialrefrigeration market. It utilizes state-of-the-art technology to provide the most reliableand energy efficient compressor availableat all operating conditions. The compressoroperates at 2975 rpm. The compressorhousing is made of cast iron, precisionmachined to provide minimal clearance forthe rotors.

The rotors are manufactured from forgedsteel and use asymmetric profiles. Thecompressor incorporates a complete anti-friction bearing design for reduced powerand increased reliability. Four separatecylindrical roller bearings handle radialloads. Two 4-point angular contact ballbearings handle axial loads. Together theymaintain accurate rotor positioning at allpressure ratios thereby minimizing blow-byand maintaining efficiency.

A non return valve is installed in thecompressor discharge housing (betweencompressor and oil separator for S4 andS5 compressor) to prevent compressorrotor backspin due to system refrigerantpressure gradients during shutdown.

The open-drive compressor shaft sealconsists of a spring loaded, precisioncarbon ring, high temperature elastomer"O" ring static seal, and stress-relieved,precision lapped collars. The entire shaftseal cavity is at low pressure, being ventedto the oil drain from the compressor.Combining low pressure with direct oilcooling provides long seal life.

Capacity ControlCapacity control is achieved by use of aslide valve which provides fully modulatingcontrol from 100% to 10% of full load. Theslide valve is actuated by oil pressurecontrolled by external solenoid valves viathe ISN Millennium Control Centre.

Heat ExchangersShells - Cooler and condenser (YNWSmodels) shells are fabricated from rolledcarbon steel plates. Carbon steel tubesheets, drilled and reamed to accommodatethe tubes, are welded to the end of eachshell. Intermediate tube supports arefabricated of carbon steel plates.Tubes - Tubes are state-of-the-art, highefficiency, steel finned and internallyenhanced type (3/4" BWG 20) for cooler,stainless steel plain tubes (3/4" BWG 22)for condenser (YNWS only) to provideoptimum performance. Each tube is rollerexpanded into the tube sheets providing aleak-proof seal, and are individuallyreplaceable.Cooler - Cooler is a shell and tube, DXtype heat exchanger. A distributor throttleprovides uniform distribution of refrigeranton tubes to yield optimum heat transfer. Arefrigerant charging valve is provided. Therefrigerant side of each cooler is designedfor 15 bar g design working pressure, testedat 30 bar g.Condenser (YNWS only) - The condenseris a shell and tube type, with a dischargegas baffle to prevent direct high velocityimpingement on the tubes. This baffle isalso used to distribute the refrigerant gasflow properly for most efficient heat transfer.The refrigerant side of each shell isdesigned for 24 bar g design workingpressure tested at 48 bar g.Compact Water Boxes - Removable waterboxes are fabricated of steel. The designworking pressure is 10 bar g and the boxesare tested at 15 bar g. Integral steel waterbaffles are located and welded within thewater box to provide required passarrangements. Stub-out water nozzleconnections with victaulic grooves arewelded to the water boxes. These nozzleconnections are suitable for Victauliccouplings, welding or flanges, nozzles arecapped for shipment. Plugged 3/4" drainand vent connections are provided in eachcooler water box.

Liquid Receiver (YNRS only)Factory fitted liquid receiver complete withrelief valve and level glass. All standardliquid line components are includedbetween the receiver and cooler.

Refrigerant Flow ControlRefrigerant flow to the cooler is controlledby a mechanical expansion valve to provide4C superheating for 100% to 10% ofcapacity.

Motor DrivelineThe compressor motor is an open drip-proof, squirrel cage, type constructed toYORK design specifications. 50 hertzmotors operate at 2975 rpm. The openmotor is provided with a D-flange, factorymounted to a cast iron adaptor mountedon the compressor. This unique designallows the motor to be rigidly coupled tothe compressor to provide factory alignmentof motor and compressor shafts.

The motor drive shaft is directly connectedto the compressor shaft with a flexible disccoupling. The coupling is of all metalconstruction with no wearing parts toassure long life, and no lubricationrequirements to provide low maintenance.

For units utilizing remote electro-mechanicalstarters, a steel terminal box is providedfor field connected conduit. There are sixterminals (three for high voltage) broughtthrough the motor casing into the terminalbox. Jumpers are supplied for three-leadtypes of starting. Motor terminal lugs aresupplied. Overload/overcurrent transformersare supplied with all units. For units suppliedwith factory packaged Solid State Starters,refer to the Accessories and OptionsSection.

Oil SeparatorThe oil separator is a horizontal design withno moving parts. Effective oil separation isachieved by gravity dropout of oil from therefrigerant gas as velocity decreases uponentering the separator, and by mesh padsto provide final gas/oil separation beforegas enters the condenser. The oil separatoris designed for 24 bar g design workingpressure. Each vessel has a refrigerantrelief device(s) set at 24 bar g.

LubricationThe main oil reservoir is located in the oilseparator. The compressor also has an oilreservoir located at the rotor bearings toprovide lubrication during start-up,coastdown and in the event of a powerfailure. During operation, system pressuredifferential provides proper oil flow withoutthe need of an oil pump. This minimizessystem energy consumption.

A 250 watt (115 volt - 1 phase- 50Hz)immersion oil heater is located in the oilseparator reservoir, temperature actuatedto effectively remove refrigerant from theoil. Power wiring is provided to the controlcentre. An external, replaceable cartridge,15 micron oil filter is provided with manualisolation stop valves for ease of servicing.

SPECIFICATION

Doc. No. PC140/11.01/GB

Page D.32

High Voltage Motor3300 volt high voltage motor instead ofstandard low voltage. Suitable for three leadtype starting only. Star delta not available.This option increase the unit height. Pleasecontact factory.

Anti-Vibration MountsSpring type vibration isolators, required onall upper floor locations, instead ofneoprene isolation pads supplied asstandard.

Flow SwitchPaddle-type vapour-proof water flowswitches suitable for 10 bar g DWP forchilled and condenser water circuits, switchfor 115V-1-50 service. A chilled water flowswitch is required. Condenser water flowswitch is optional (YNWS only).

Cooler InsulationFactory applied anti-sweat flexible closedcell plastic type insulation, 19 mm thick,fixed with vapour-proof cement to cooler,liquid lines, suction lines and as necessaryto auxiliary tubing. Does not includeinsulation of water nozzles. Normallyprevents sweating in environments of 75%RH and temperatures between 10C and32C. 38 mm insulation is available for 90%RH conditions.Note: It is difficult to insulate the undersideof the chiller when installed.

Pressure Vessel CodesPressure Vessels can be supplied inconformance with the following codes:

DRIRE (France)T.U.V. (Germany & Austria)I.S.P.E.S.L. (Italy)ASMESVDB (Switzerland)SA (Sweden).

High Protection MotorIP 54 protection motor instead of standardIP 23 protection.

Siemens Control PanelSIEMENS 95 U microprocessor with OP07or OP35/37 operating display instead of ISNcontrol panel.

Gauge Kit3 pressures gauge (Suction, Discharge and,Oil) added to the control system.

Dual Oil Filter

Suction ValveOne suction valve on the compressorsuction pipe.

Factory Running Test

Factory Performance Test(Norm NF E35.201 & ISO/R916:1968)

Factory Welded FlangesFactory welded on cooler and condenser(YNWS only) connections, withoutcompanion flange. Flange PN 10 ISO type1 NFE 29.203.

Marine Water Boxes on Condenser(YNWS only)Removable bolted water boxes, instead ofstandard compact boxes, at nozzle end only.

Shipping SkidsUnit shipped on two wood skids. Heightincrease 150 mm. Weight increase 135 kg.

Remote Interface Option Boards(only with ISN Control Panel)Allows remote reset of temperature setpoint and current limit. Boards accept 4-20mA or 0-10 V control signals. Field installed.

Solid State Starter(only with ISN Control Panel)Water cooled factory mounted starter.Reduced voltage, soft start. Controlledinrush maintains motor current at a constantlevel throughout the acceleration periodusing six silicon controlled rectifiers.

SPECIFICATION (Continued)

ACCESSORIES AND OPTIONS

Refrigerant IsolationThe condenser shell (YNWS) or liquidreceiver (YNRS) serves as a refrigerantreceiver to store the system charge duringservicing. Manually operated isolationvalves are located at the inlet and outlet ofthe condenser or liquid receiver. Valves arealso provided to facilitate removal of therefrigerant from the system should that benecessary.

ISN Millennium Control CentreThe ISN Millennium Control Centre isfactory mounted, wired and tested. Theelectronic panel automatically controls theoperation of the unit in meeting systemcooling requirements while minimizingenergy usage. Chiller operating parametersare sensed by either thermistors ortransducers and displayed on the keypad.The control centre is fused through a 1-1/2 kVA transformer in the compressor motorstarter.

Isolation MountingThe unit is provided with four vibrationisolation mounts consisting of 25 mm thickneoprene isolation pads for field mountingunder the steel mounting pads located onthe tube sheets. Suitable for ground floorinstallations.

PaintExterior surfaces are protected withCaribbean blue machinery paint.

ShipmentProtective covering film is supplied on theunit water nozzles are capped with fittedplastic enclosures.

Page D.33

Doc. No. PC140/11.01/GB

The ISN Millennium Control centre providesthe ultimate in efficiency and chillerprotection. State-of-the-art micro-electronicsassure precise, reliable chiller control logicand safety annunciations. The control centreallows direct interfacing with the YORKIntegrated Systems Network (ISN) buildingmanagement system, allowing completeintegration of chiller, airside, and buildingautomation controls.

Microcomputer Control CentreOther Building Management Systems canbe interfaced by applying a YorkTalktranslator.A keypad, divided into distinct colour codedgroups, according to function, provides easyaccess to all chiller control and monitoringfunctions. Essential set points that can beprogrammed include leaving chilled liquidtemperature, electrical demand limit, anddaily start/stop schedule.

Data LoggingAll data required for accurate, detailed logscan be collected directly from the displayor via a printer that can be connected tothe panel. A printed log can be obtainedautomatically at predetermined timeintervals without the need for the presenceof an operator.

Advanced Warning of ProblemsChanges in motor current, oil temperatureand pressure, refrigerant pressures, orwater temperatures can be valuableindicators of developing problems. This datagives you ample time to take correctivemeasures before any major expense ordowntime occurs

Advanced Warning of Tube FoulingNo longer must an owner guess whenwater-side fouling begins to waste energy.The YORK Micro-Computer Control Centreprovides readouts of saturated refrigeranttemperatures. A simple review of thereadings will indicate if tube cleaning isneeded.

Trouble Shooting DiagnosticsSafety shutdown annunciations includeinformation on day and time of shutdown,cause of shutdown, and type of restartrequired. Cause of shutdown is displayedeliminating time-consuming crossreferencing and confusion. A software testbutton inside the Microcomputer Controlcentre allows you to verify the operationalstatus of each electronic circuit board inthe panel.

Schedule Routine MaintenanceWith more information about chilleroperation available, routine maintenancecan be accurately scheduled well inadvance of actual need. And with advancedinformation on the nature of themaintenance required, you can confidentlyschedule routine service whenever it's mostconvenient for day-to-day building operation.

Information DisplayVital chiller operating information can beshown on the 40-character alphanumericdisplay. All information is in plain language.Reference codes are not used. Informationprovided on all units as standard includes:

Chilled liquid temperatures - entering andleaving

Condenser liquid temperatures -enteringand leaving (YNWS only)

Refrigerant pressures - cooler andcondenser

Oil pressure - at compressor and oil filterdifferential

Oil temperature % motor current % slide valve position Operating hours Number of compressor starts Saturation temperatures - cooler and

condenser Discharge temperature Suction temperature - Superheating

Information provided as an option: Three phase motor current with Solid

State Starter option Three phase motor voltage with solid

State Starter option

In addition, all operating and setpointinformation can be transmitted to anoptional remote printer through the RS-232port to obtain data logs: At any time by pressing PRINT button At set time intervals by programming the

panel Record of time and cause of safety and

cycling shutdowns with all operatinginformation just prior to shutdown

History printout of last four shutdowns

ISN MillenniumTM CONTROL CENTRE

ISN Millennium Control centre

FIGURE 5 Precise Leaving Chilled WaterTemperature Control Digital keypad entry of setpoint to 0.05C Verify actual vs. setpoint temperature via

alphanumeric display Remote reset capability standard with

YORK ISN Building Automation system,optional for other analog or discreetremote signals.

Adjustable remote reset range ( up to11C) provides flexible, efficient use ofremote signal depending on reset needs.

Thermal (ice) Storage Control ModeThermal ice storage systems are basedon the concept of using off-peak, lower costelectricity to build ice for handling thecooling load during peak hours. The mostefficient way to build ice is to maximizechiller load and minimize run time. Standardchiller control systems are not designedfor this operating mode. In a typicalapplication, chillers will load and unload tomaintain a leaving chilled liquid setpoint.

When the YORK chiller operates in thethermal storage control mode, the unit willremain at 100% load until the setpointshutdown temperature is reached. To addgreater operating flexibility and eliminateunnecessary chiller cycling, two differentLow Water (Liquid) Temperature RestartThresholds can be programmed, one forthe ice mode and one for the standardcooling mode.

This control enhancement is standard onall chillers. The chiller can also be left inthe standard control mode for temperaturesbetween -6,7 to 0C, for applicationsinvolving a process cooling duty thatrequires leaving chilled liquid temperaturesetpoint control.System Cycling Controls Programmable seven-day time clock for

automatic start/stop of chiller, and coolerand condenser water pumps, and coolingtower.

Separate schedule input strictly forholidays.

Remote cycling contacts available forother field-supplied signals.

Motor Current Limiting Controls Programmable pulldown demand to

automatically limit motor loading forminimizing building demand charges

Pulldown time period control up to fourhours.

Verify time remaining in pulldown cyclefrom display readout.

Separate digital setpoint for currentlimiting between 40 and 100%.

Remote reset capability standard withYORK ISN Building Automation System,optional for other analog or discreetremote signals.

Doc. No. PC140/11.01/GB

Page D.34

Safety - those controls which (whenemployed) require a manual operation todepress the STOP-RESET switch and thenCOMPRESSOR START to restart thesystem. High Compressor Discharge temperature

- fixed cutout provided by thermistorsensor.

High Oil Temperature- fixed cutout provided by thermistorsensor.

Manual Restart after Power failure (jumperplug supplied if automatic restart isdesired).

High Oil Pressure or Low Oil Pressure- fixed cutout provided by differentialbetween separate transducer readingsfrom the compressor sump and bearingfeed line.

Low Cooler Pressure or High CondenserPressure- to avoid nuisance cycling, thecompressor capacity is held at cutoutthreshold for a safe period of time; ifcondition persists, a fixed cutout isprovided by dedicated transducers.

Clogged oil filter. Low oil level switch in oil separator. Remote stop (field-supplied signal). Differential between Leaving Chilled water

and Cooler Saturation temperatures- fixed cutout when value falls outsidespecified range to detect faulty sensors.

Motor Controller- fixed cutout provided by motor overloads(manual reset required of specificcontroller depending on starter type).

Control Mode SelectionThere are three keys for the selection ofthe control centre modes : ACCESS CODE permits access to the

microcomputer PROGRAM and MODEbuttons.

PROGRAM permits the operator toprogram the setpoints.

MODE permits the operator to select thefollowing control modes :

LOCAL allows manual compressor startfrom the compressor switch located onthe control centre.

REMOTE allows remote start and stopof the compressor and remote reset ofthe chilled water temperature and currentlimit.

SERVICE allows manual operation of thescrew compressor slide valve, includesLOAD, UNLOAD HOLD and AUTO keys.

Field Interlocks-Chiller Status Remote mode ready to start - contact

closure indicates that the panel is inREMOTE mode and that the unit will start(all safeties and cycling devices satisfied)when a remote start signal is received.

Cycling shutdown - contact closureindicates that a cycling shutdown hasoccurred and that the unit will restartwhen the cycling control re-closes.

Safety shutdown - contact closureindicates that a safety shutdown hasoccurred and that a manual reset isrequired to restart.

Run contact - closure indicates that thepanel is providing a run signal to thecompressor motor starter.

System Shutdown ControlsThe following safeties responsible forsystem shutdown are shown on thealphanumeric display. Each annunciationdetails the day, time, reason for shutdownand type of restart required. All shutdownsare sequenced by the micro board exceptas noted.

Cycling - those controls whichautomatically reset and permit auto restartof the system (as allowed by anti-recycletimers). Low water temperature as sensed

through the LWT sensor. If a drop in watertemperature occurs, the unit is stoppedat 2.2C below the chilled liquidtemperature setpoint. On a rise in watertemperature, the unit restartsautomatically.

Chilled water pump interlock or flowswitch. Flow must be interrupted for aminimum of two seconds before shutdownwill occur.

Remote/local cycling devices (fieldsupplied).

Automatic restart after power failure (ajumper plug is supplied if automaticrestart is desired).

Multi-unit sequencing. Power fault relay. High and low line voltage with Solid State

Starter option.

ISN MillenniumTM CONTROL CENTRE (Continued)

Refrigerant Relief PipingEach chiller is equipped with pressure reliefdevice and the vent line must be connectedto the outside of the building. This pipingshould include a flexible connection and acleanable vertical-leg dirt trap to catch ventstack condensation.

LocationChillers should be sited on a mounting padwhich is level within 5 mm and capable ofsupporting the operating weight. Neopreneisolators, supplied as standard, areadequate for ground floor installations. Forupper floor locations optional springisolators are required. Sufficient clearance,around the unit, for normal serviceoperations should be provided andadditional space at one end of the unit fortube cleaning is required.

VentilationAll mechanical refrigeration plant roomsshould be vented to outside by one or morefans. Since the Millennium motor is aircooled ventilation should allow for theremoval of heat from the motor.

Specific Regulation for AmmoniaRefer to the regulation in force in the settingup country.

APPLICATION DATA

Remote CondensersWhere a chiller is used in conjunction witha remote condenser, the condenser shouldbe located as close to the chiller as possible.This will minimize refrigerant pipingpressure drop. Adequate subcooling mustbe provided to assure liquid refrigerant atthe thermal expansion valve in a sub-cooledstate. A relief valve must be installed inaccordance with the applicable local codes.

The condenser must be located highenough above the liquid receiver to achieveliquid draining of the condenser.

Page D.35

Doc. No. PC140/11.01/GB

YNWS REFRIGERANT FLOW DIAGRAM FIGURE 6

CONDENSER

FILTEROIL SEPARATOR

COOLER

MOTORCOMP.

S

S

S

S

BT

AP

+ -

LIQUIDINLET

LIQUIDOUTLET

WATEROUTLET

WATERINLET

YNRS REFRIGERANT FLOW DIAGRAM FIGURE 7

OIL SEPARATOR

REMOTECONDENSER

LIQUID RECEIVER

CUSTOMER SUPPLY

MOTORCOMP.

S

S

S

BT

AP

+ -

FILTER

COOLER S

LIQUIDOUTLET

LIQUIDINLET

Static headto overcomecondenserpressure

drop

Doc. No. PC140/11.01/GB

Page D.36

,

!

Chiller typeYNWS : Water Cooled ChillerYNRS : Remote Condenser Model

Refrigerant type : R717 (NH3)

Cooler code

Condenser code (YNWS only)

Compressor code

50 Hz

Motor code

Motor VoltageLow voltage motors (up to and including400 volts) are supplied with six leads. Highvoltage (3300 volts) motors have threeleads. Motor circuit conductor size must bein accordance with applicable codes, forthe motor full load amperes (FLA). Flexibleconduit should be used for the last meteror two to the chiller in order to providevibration isolation. Table 1 lists the allowablevariation in voltage supplied to theMillennium motor. The unit name plate isstamped with the specific motor voltage,and frequency for the appropriate motor.

StartersThe Millennium is available with a factory-mounted and wired YORK Solid StateStarter for voltages up to 400 volts. Othertypes of remote mounted starters areavailable. These electro-mechanical startersmust be supplied in accordance with YORKStandard Specifications. This will ensurethat starter components, controls, circuits,and terminal markings will be proper forrequired overall system performance.

ControlsA 115 volt (220 volt for optional SIEMENScontrol panel), single phase, 50 Hertzpower supply must be supplied to the chillerfrom a separate, fused disconnect or froma control transformer included as an optionwith electro-mechanical starters. No fieldcontrol wiring is required when a YORKSolid State starter is supplied.Copper Conductors

Only copper conductors should beconnected to compressor motors andstarters. Aluminium conductors haveproven to be unsatisfactory when connectedto copper lugs. Aluminium oxide and thedifference in thermal conductivity betweencopper and aluminium cannot guaranteethe required tight connection over a longperiod of time.

CapacitorsCapacitors can be applied to a YNWS forthe purpose of power factor correction. ForStar-Delta Closed-Transition and Across-the-Line starters, the capacitors should belocated on the load side of the starter. ForYORK Solid State Starters, the capacitorsmust be located on the line side of thestarter. Capacitors are not recommendedfor use with star-delta Open-transitionstarters. The capacitors must be verified byYORK.

Compressor Motor Power SupplyElectrical power wire size to the Millenniumis based on the minimum unit ampacity.For Solid State Starters, this wiring is doneat the factory. For remote starters, thecalculation of ampacity, is summarizedbelow. More specific information on actualamperage ratings will be supplied with thesubmittal drawings. Six-lead type of starting (Star-delta)

Minimum circuit ampacity perconductor (1 of 6):Ampacity = .721 x compressor motoramps.

YNWS 717 FC GC S2 5 CK

Three-lead type starting(Across-the-Line, Autotransformer andPrimary reactor)

Minimum circuit ampacity perconductor (1 of 3):Ampacity = 1.25 x compressor motoramps.

Fused Disconnect SwitchThe fused disconnect switch for thecompressor motor starter must be sized inaccordance with the applicable code.Below 415 volts, the formula generally is:

Amp rating = 115% x amps of all loadson the circuit.

This would include compressor motor, andmay include control transformer. Refer tosubmittal drawings for specific calculationsfor each application.

Ampacity on Line Side of StarterMin. Circuit Ampacity

= 125% of compressor motor amps(FLA) + all other loads on the circuit

The only additional load on the circuit forthe Millennium would be the controltransformer, unless they are supplied by aseparate source.

Branch Circuit Overcurrent ProtectionThe branch circuit overcurrent protectiondevice(s) should be a time delay type, witha minimum rating equal to the next standardfuse/breaker rating above the calculatedvalue. It is calculated taking into accountthe compressor motor amps and may alsoinclude control transformer. Refer tosubmittal drawings for the specificcalculations for each application.

IDENTIFICATION

ELECTRICAL DATA

TABLE 2 MOTOR VOLTAGE FACTORS

Page D.37

Doc. No. PC140/11.01/GB

TB4TB2 TB5

L2

2L

L2

2L

L3

2L

L1

POWER SUPPLYL1 L3

1.5 KVA

15AL 2 43 53 13 1 24 2

T1

2T

2

2T

62

T5

2T

42

T3

IF UNIT IS SUPPLIED WITHA YORK SOLID STATESTARTER CONNECT TOFACTORY INSTALLEDDISCONNECT

CONTROLPOWERTRANSFORMER

Millennium CONTROL CENTRE FIELDWIRING TERMINAL BOARDS(TB2, TB4 & TB5)

CONDENSER WATER PUMPOR REMOTE CONDENSER

CHILLEDWATER PUMP

FLOWSWITCH

EARTH SCREWS

Millennium MICRO-COMPUTERCONTROL CENTRE

REMOTEELECTROMECHANICALSTARTER

COMPRESSORMOTOR

N

TB4

POWER CONNECTIONS TB2

TB5

3N ~ 50 Hz400V

or330V

817

19

201

13121

19

LLL

2

32

25244

3536153

424140

43

4544

2726

CYCLING SHUT-DOWNINDICATION

SAFETY SHUT-DOWNINDICATION

CHILLED WATER PUMPSTART / STOP

Millennium RUNINDICATION

CONDENSER WATER PUMPOR REMOTE CONDENSERSTART / STOP

START

STOP

REMOTE LWTRESET

REMOTE START / STOPFROM BMS OR PUSH BUTTON

CONNECT TOOPTIONALPCB'sREMOTE CURRENTRESET

LOCAL REMOTESTART / STOP

CHILLED WATERFLOW SWITCH

MULTI UNIT SEQUENCESTART / STOP

MANUAL RESET OVERLOADSELECTRO-MECHANICAL STARTER

REMOTE MODE READYTO START INDICATION

ISN MICRO PANEL CONNECTIONS

ELECTRICAL CONNECTIONS

Doc. No. PC140/11.01/GB

Page D.38

100

90

80

70

60

50

40

30

10

9

8

10 20 30 40 50 60 70 1009080 200

20

7

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GC

FCHC JC

KC LC MCNC

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SECONDARY FLUID QUALITYThe cooler and condenser are designed for use with noncorrosivewater. Water and glycol brine analysis is essential in protectingsystem heat exchangers. Analyses prior to start-up will preventcorrosion. When the system has been turned over to the owner,the latter should take such steps as will ensure the continuedprotection of the heat exchangers.YORK recommends the use of local water treatment company.

SECONDARY FLUID SYSTEMR717 (NH3) and copper are incompatible. Whenever copper is inthe secondary system, pH levels must be monitored on apermanent basis using an electrometric pH meter that will alertto the presence of ammonia.

Recommendations for maintenanceIt is good practice to have the system analysed first and the wateranalysed on a periodical basis by a water conditioning engineer.A minimum protective measure is to periodically check systemwater pH content, which should be between 7 and 8. Any otherpH levels will immediately cause corrosion. Checking systemwater pH levels, in addition, is an excellent way of monitoringammonia (NH3) leakage.

: Condenser CodeFC

WAT

ER

PR

ES

SU

RE

DR

OP

kP

a

WATER FLOW RATE l/s

OPERATING LIMITATIONS

Nota 1 : 45C of LCWT or 50C of condensing temperature.

COMPRESSORMaximum condensing saturation temperature : 50CFor condensing temperature above 50C consult our TechnicalDepartments.

Maximum discharge temperature : +100C

Nominal discharge temperature : +65CThe discharge temperature should always be at least 15Cover the saturated condensing temperature.

CONDENSER (YNWS only) AND COOLERMaximum waterside operating pressure : 10 bargMaximum water and brine pressure drop : 100 kPa

The chart below describes the pressure drop for your nominalflow (pressure drop are given with a tolerance of 20%) andstandard range of YNWS and YNRS. Lower pressure drop orhigher flow rate and more accurate calculation can be achieved(contact York Engineering Department).

YNWS and YNRS 717 chillers with steel tube coolers shouldbe installed in closed systems only.

TABLE 4 CONDENSER 3 PASS FLOW LIMITATIONS

FIGURE 8 CONDENSER 3 PASS PRESSURE DROPS

TABLE 3 TEMPERATURE RANGE

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Page D.39

Doc. No. PC140/11.01/GB

9 6 6

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6 9 /

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100

90

80

70

60

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OPERATING LIMITATIONS (Continued)W

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Pa

Water application

WATER FLOW RATE l/s

COOLER - BRINE COOLING APPLICATIONMaximum waterside operating pressure : 10 barg

- All units are designed for a maximum nominal pressure dropof 100 kPa. The pressure drop tolerances depend on theapplication. For any warranty on this value, see the tolerancesin the YF selection software or consult York.

- The maximum flow of the secondary fluid is a function of thenumber of baffles in the cooler. This number of baffles iscalculated to keep 100 kPa maximum pressure drop and is afunction of your nominal flow. For your unit the maximum flowis 10% over the nominal flow of the contract selection. Theminimum flow is 20% lower than the nominal flow.

- The number of the baffles could be designed by the YF selectionsoftware to keep the pressure drop you want, function of yournominal flow and the percentage of brine.COOLER PRESSURE DROPS FIGURE 9

CHILLED WATER FLOW LIMITATIONS "

COOLER - WATER COOLING APPLICATION

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Doc. No. PC140/11.01/GB

Page D.40

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REMOTE CONDENSER INSTALLATIONThe customer must supply and install the remote condenser withconsideration given to the following :1 - The remote condenser should be in close proximity to the unit

to minimize piping pressure drop.2 - The height of the remote condenser above liquid receiver

must be large enough to overcome condenser and pipingpressure drop at full load.

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RECOMMENDED COOLER/CONDENSER PIPEWORKARRANGEMENT

Refrigerant

Isolating Valve

Flow Switch

Regulating Valve

Flow Measurement Device

Strainer

Pressure Tapping

Flanged Connection

Water

Water

(1) The refrigerant charge depends on the leaving chilled watertemperature. The charge is given at +6C leaving chilled watertemperature.

()*+,--(+(.,

TABLE 6 REFRIGERANT CHARGE (1)

TECHNICAL DATA

TABLE 6 OIL CHARGE

TABLE 7 COOLER AND CONDENSER WATERCAPACITIES

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Page D.41

Doc. No. PC140/11.01/GB

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Optional Flanges

Doc. No. PC140/11.01/GB

Page D.42

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YNWS DIMENSIONS AND WEIGHT

(1) : Without suction valve option(2) : With suction valve option(3) : For high voltage motor option, please contact factory.

Shipping height : add 150 mm for shipping skid option.

Page D.43

Doc. No. PC140/11.01/GB

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(1) : Without suction valve option(2) : With suction valve option(3) : For high voltage motor option, please contact factory.

Shipping height : add 150 mm for shipping skid option.

DE : COOLER WATER INLET AND OUTLETDG : RECEIVER EQUALIZINGDL : CONDENSER LIQUIDDR : CONDENSER GAS

YNRS DIMENSIONS AND WEIGHT

Doc. No. PC140/11.01/GB

Page D.44

SB

SD770*

* Required service clearance

REAR OF UNIT FRONT OF UNIT

SL

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CONDENSEROR RECEIVER

OIL SEPARATOR

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Page D.45

Doc. No. PC140/11.01/GB

AY

H

L

OIL SEPARATOR

RECEIVERCOOLER

COMPRESSOR

Doc. No. PC140/11.01/GB

Page D.46

NOTES