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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.
!"#!$"%&"'!"('$"%'"#"(!"(
) !"#!$"%&"'!"('$'"#"*"(!+("
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
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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.
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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
6
GC
FCHC JC
KC LC MCNC
-*,&. -,#. -*
,&. -,#.
/
0
1
2
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
"% &"'3!"(!"*"(!+("$
"%4 !"*"(!+("$ 5
"% '"#"(3!"(!"*"(!+("$ !"
) '"#!"*"(!+("$
6!"( '"#"(3!"(!"*"(!+("7%"
"% &"'8+'!"*"(!+("-.
-
Page D.39
Doc. No. PC140/11.01/GB
9 6 6
6 : /
9 /
6 9 /
6 9 /
/
100
90
80
70
60
50
40
30
10
9
8
5 6 7 1098 20 30 40 50 60 70 1009080
20
7
6
5
4
3
A
B
C
D E
FG
H
OPERATING LIMITATIONS (Continued)W
ATE
R P
RE
SS
UR
E D
RO
P k
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
-*,&. -,#. -*
,&. -,#.
9 ;
6 ;
;
: ;
/
/:
-
Doc. No. PC140/11.01/GB
Page D.40
#$%&
9
9 /
6
6 /
9
9 /
6
6 /
6 /
6
6 0
/
0
6
6 0
6 1
0
1
:, 1
:,
:, 2
:,
/:,/ 1
/:,/
/:,/ 2
/:,/
:,
:, 2
:,
/:,/
/:,/ 2
/:,/
"( '"#"(
"( !"( '"#"( !"(
4" !4 4" !4
-!"(#. -!"(#.
9
6 /
:
0
/: 1
/
2
REMOTE CONDENSER INSTALLATIONThe customer must supply and
install the remote condenser withconsideration given to the
following :1 - The remote condenser should be in close proximity to
the unit
to minimize piping pressure drop.2 - The height of the remote
condenser above liquid receiver
must be large enough to overcome condenser and pipingpressure
drop at full load.
#'&
;;;
;
RECOMMENDED COOLER/CONDENSER PIPEWORKARRANGEMENT
Refrigerant
Isolating Valve
Flow Switch
Regulating Valve
Flow Measurement Device
Strainer
Pressure Tapping
Flanged Connection
Water
Water
(1) The refrigerant charge depends on the leaving chilled
watertemperature. The charge is given at +6C leaving chilled
watertemperature.
()*+,--(+(.,
TABLE 6 REFRIGERANT CHARGE (1)
TECHNICAL DATA
TABLE 6 OIL CHARGE
TABLE 7 COOLER AND CONDENSER WATERCAPACITIES
#$%&
/01(20(3.,3-,+
43./52/./3,
) 9
) 6
) 9
) 6
) 6
)
) 6
)
) :,
) /:,/
) :,
) /:,/
-
Page D.41
Doc. No. PC140/11.01/GB
()/!, "
9 5
9 5
9 5
9 5
9
9
T
D
Optional Flanges
-
Doc. No. PC140/11.01/GB
Page D.42
#& #&
(.,' " -1/**/3% (*,+40/3%
-**. -**. -**. -**. -**. -**. -**. -**. -**. -**. -**. -**. -9.
-9. -. -.
6
6
6
6
6
6
6
6
6
6
6
6
6
6
CO
ND
EN
SE
R I
NL
ET
DC
COOLER INLETDE
COOLER OUTLETDE
CO
ND
EN
SE
R
OU
TL
ET
DC
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
#& #&
(.,' " -1/**/3% (*,+40/3%
-**. -**. -**. -**. -**. -**. -**. -**. -**. -**. -**. -**. -**.
-**. -9. -9. -9. -9. -. -.
"
"
,
" ,
"
,
P
C
KS
Q
R
1250
150
15 E
DE
DE
HL
B DE
E
A
D
DL
DG DR
(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
SJ
SSS
SSS
SSS
100
SK
CONDENSEROR RECEIVER
OIL SEPARATOR
MOTOR
COOLER
COOLER
COMPRESSOR MOTORPOWER CONNECTIONENTRANCE
POWER WIRINGENTRANCE COVER
AXE OF POWERCONNECTION LOCATION
SG
SA
01+2
01+2
01+27
#))&
01+2" 801+2
#))&
"9
"9
:
:
:
01+2" 801+2
#))&
" #))&
#))&
#))&
,/%10 #$%&
SOLID STATE STARTER (OPTIONAL)
SELECTION TABLE
2)96 9 6 / > 0 1 2 < ? ) @
: :
: : 2)
A/6
-
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