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YORK Millennium Rotary Screw Chillers with OptiView Control Center

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Page 1: YORK Millennium Rotary Screw Chillers - Ingenieria de … · YORK Millennium Rotary Screw Chillers ... many screw chiller designs ... water-cooled oil coolers used on other screw

YORK Millennium

Rotary Screw Chillerswith OptiView Control Center

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OptiView Control Center for crystal-clear chilleroperation

See why the YORK

OptiView Control Centeris easier to use

YORK has always pioneered powerful,yet simpler chiller control. We were the first to apply the OptiView Control Center to liquid chillers.

As a result, YORK rotary screw chillersnow incorporate the full-color, active-matrix,

YORK® OptiView Control Center as a standard feature.

It’s an advanced, microprocessor control panel that sets the standard by presenting more data in the most user-friendly way possible. You still get the code-free, plain-language data you’reaccustomed to from a YORK microprocessorcontrol panel. But now it’s even easier to read, thanks to a large, full-color, active-matrix display technology.

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These sample screens demonstratehow easy it is to access and viewmore useable data. These are typicalof the over 35 screens available on the YORK OptiView Control Center.

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This larger display shows even moredata per screen with far less button pushing.And that makes it much quicker and easierto operate your chiller.

To facilitate a higher level of monitoringand control, data outputs are shown inassociation with illustrations of the appropriatechiller components—a layout that minimizesuser confusion. Plus, a “navigation bar”quickly guides you to the level of informationyou need. For convenience, all data can bedisplayed in English or several other languages,as well as English or metric units.

Enjoy the advantage ofcursor navigation andkeyboard input

With the OptiView Control Center, datainput is foolproof. A dedicated keypad fornumerical input minimizes keystroke errors.Cursor controls for screen navigation makeit easy to access all input, control, andmonitoring functions.

On-screen trend analysisThe YORK OptiView Control Center

full-screen, full-color display allows on-boardtrending of up to six different values, selectedfrom over 100 items, directly at the chillercontrol panel. The values and samplinginterval are all user selectable via theOptiView Control Center. This flexibilityallows the operator to select parameters

that are critical for their operation and to trend operating characteristics without aBAS interface and separate monitor.

Get the message – graphically and quickly

Thanks to the large, active-matrix screen,complete, detailed logs can be read directlyfrom the OptiView Control Center. Insteadof keystroke after keystroke to gather sufficient data from a small, monochromeLCD screen, a single button reveals anarray of chiller information that is quicklyseen on a single screen. Data output is provided in precise, digital form. Valuableoperator time is freed for other importantactivities.

Advanced data loggingFor convenience, a printer can be easily

connected to the control center withoutinterfacing through a BAS system panel. A printed log can be obtained automatically,at predetermined time intervals, without an operator interface. In addition, servicetechnicians can use a portable printer todownload information for troubleshootingand repair. All this can also be done whileconnected to a BAS system.

BAS compatibleEnergy savings and ease of use can

be fully realized when the HVAC system isan integrated part of the BAS system. TheYORK OptiView Control Center is designedto communicate with most existing controlsystems on the market today, such asBACnet and others.

Four control options available through securityaccess code

You can rest assured that along withstate-of-the-art control, the OptiView ControlCenter provides advanced levels of security.Setpoints are protected by a user-selectablesecurity access code. A “Remote” modeallows a BAS to implement sophisticatedcontrol strategies as a first priority. A “Local”mode provides full control at the chiller control panel. “Operator” opens control software to your commands. And “Service”gives qualified service personnel exclusiveaccess to special functions.

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Designed for energy efficiency

Until now, many screw chiller designshave emphasized low first costs withoutoffering low operating costs, resulting inchillers with reduced heat exchanger surfacesand inefficient low-load capabilities.

Fortunately for those who pay energybills, YORK® has taken a different path. The YORK screw chiller carries the nameMillennium®, because it has the same excellent operating-cost capabilities pioneeredby our Millennium centrifugal chillers.

ARI-certification programThe performance of YORK Millennium

chillers is certified to the Air Conditioning andRefrigeration Institute (ARI) as complyingwith the certification sections of ARI Standard550/590. Under this program, chillers areregularly tested according to strict ARI standards providing an independent, third-party verification of Millennium chiller performance.

Part-load efficiency plays a very importantrole in overall chiller efficiency, since chillersspend the majority of their operating hoursat part-load. The ARI Certification Programprovides an easy method to compare chillerperformance at part-load, using the IntegratedPart Load Value (IPLV) and the Non-StandardPart Load Value (NPLV). The IPLV andNPLV ratings of Millennium screw chillersare unsurpassed in energy efficiency.

Superior low-load capabilityThe Millennium screw chiller can

transition easily and efficiently from 100% of capacity down to 10%—competitivechillers cannot. The key is a compressordesign which prevents oil from leaking intothe suction line, regardless of refrigerantgas velocity.

Other screw compressors cannot unloadbelow 25% to 30% of capacity, seriouslyimpairing their low-load efficiency. Thesedesigns utilize bottom-suction inlets, andrequire a high refrigerant gas velocity toprevent oil from dropping into the evaporator.

Competitive screw chillers rely on a high refrigerant velocity to prevent oil loss to the evaporator which limits unloading capability.

Competitive Compressor

YORK

The Millennium rotary screw compressor offers a greater unloading range because oil cannot drop into the evaporator at low loads.

Precisely machined rotary screws provide highly efficient compression.

Advanced chiller technologyreduces operating costs

Oil Injection

Oil Injection

Oil Resevoir(both ends)

Refrigerant Gas

Refrigerant Gas

Oil

Oil

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chillers at off-peak times when rates arelow, and store the thermal energy for useduring peak hours of the day when ratesare high. The YORK Millennium Screwchiller maximizes ice build time by utilizingan alternate unloading scheme designedspecifically for thermal storage applications.This logic maintains maximum chiller loadingwhere conventional chiller control logic willunload the chiller. The benefit is a shorterchill time and maximization of operationduring off-peak rate time.

Take advantage of coldertower water

YORK 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 tower water temperature to drop,rather than artificially holding it at 70-75°Fas required by some chillers.

Advanced warning of tube fouling

No longer must an owner guess whenwater-side fouling begins to waste energy.The YORK OptiView Control Center providesreadouts of saturated refrigerant temperatures.A simple review of the readings will indicateif tube cleaning is needed.

Designed for integration intoa building automation system

If you want even more sophisticatedcontrol strategies, the OptiView ControlCenter provides a built-in interface thataccepts all types of building automationsystems available today. You can takeadvantage of strategies such as chilledwater temperature reset, adaptivestop/start, and special demand schedulesquickly and easily.

Matched components maximize efficiency

Actual chiller efficiency cannot bedetermined by analyzing the theoretical efficiency of any one chiller component. It requires a specific combination of heatexchanger, compressor, and motor performances to achieve the lowest systemkW/Ton. YORK® Millennium® technologymatches chiller system components to providemaximum chiller efficiency under actual—not just theoretical—operating conditions.

Open motor eliminates hermeticmotor energy losses. YORK Millenniumclose-coupled, open drive design reducesenergy usage by 3% to 6% compared tohermetic refrigerant-cooled drives. Air-cooled motors do not reject heat into thechiller system, providing the same coolingcapacity for less motor power.

Precise chilled water temperature setting to 0.1°. A chiller is designed to produce chilled water at a given temperature.But until now, the setting of this crucial tem-perature involved laborious trial-and-erroradjustments, often accurate to only +/-1°.And a setting of 1° below design canincrease chiller energy consumption by as much as 3%, wasting thousands of kilowatt-hours per year.

The OptiView Control Center eliminatesthis energy waste. Now you have the capability of setting chilled water temperatureto a resolution of 0.1° right at your fingertips.Energy savings through chiller control hasnever been easier— or more accurate.

High-efficiency heat exchangers.Millennium heat exchangers offer the latesttechnology in heat transfer surface designto give you maximum efficiency and compactdesign. Water-side and refrigerant-sidedesign enhancements minimize both energyconsumption and tube fouling.

Thermal Storage Control Mode

As electricity markets deregulatearound the US and the world, significantoperating savings can be obtained by utilizing a thermal storage system. This system design allows owners to run

YORK Millennium rotary screw chillers offer greater energy efficiency.

YORKMilleniumScrew Chiller

%Tons

kw/T

R

CompetitiveScrew Chiller

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has traditionally been plagued by excessivewear. Critical tolerances in relation to therotors can be compromised, and, in manycases, the valve may actually hit the high-speed rotors.

Time-proven oil management system

Screw compressors use oil to seal themeshing rotors for efficient compressionand to cool the mating parts. Much of thisoil becomes entrained in the refrigerantgas. If it is not removed, it will becometrapped in the heat exchangers, robbing the compressor of critical lubrication andwasting energy.

The Millennium screw chiller uses a time-proven two-stage oil separator,removing the oil by gravity dropout and bymesh eliminators. In addition, an eductorremoves any oil that might migrate to theevaporator, particularly at low loads. Systemreliability is further enhanced by the refrig-erant-cooled oil cooler, which never needscleaning—a distinct advantage over thenon-cleanable, water-cooled oil coolersused on other screw chillers.

Oil reservoir positioned for constant lubrication

A compressor must have adequatelubrication during startup and shutdown, or it may seize. Less advanced designs

Reliability from the screw compressor leader

Reliability is built into a YORK®

Millennium® screw chiller from the outset.The rotary screw compressor designed byYORK Refrigeration’s Frick® subsidiary hasbeen proven dependable in thousands ofdemanding industrial refrigeration and gascompression applications since the early1980s. No other manufacturer can matchYORK Refrigeration in the number of rotaryscrew compressors installed worldwide inrefrigeration and air conditioning applications.

Slide-valve design reduces wear

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

In designs used by less experiencedscrew chiller manufacturers, the slide valveassembly is confined to an area directlyabove the rotors. Therefore, it must be supported by the sides of the housing only, a much less secure design which

Proven design providesgreater reliability

Only the rotor housing sidewalls support the slide valve, often resulting in excessive wear and loss of tolerances.

YORK slide valve extends beyond the rotor housing to where the discharge housing can support the valve from underneath, providing secure positioning and close tolerances.

Competitive-slide valve support YORK slide-valve support

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Rotor Rotor

Rotor Housing

Slide Valve

Support Areas

Support Areas

Support Areas

Support Areas

Slide Valve

Rotor Housing

Discharge Port

Discharge Housing

Rotor Housing

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depend only on residual oil clinging to compressor surfaces to provide lubrication.

Our screw compressor leaves nothingto chance. An oil reservoir located at rotor-bearing level ensures proper lubricationduring startup and shutdown.

Open drive design—so reliable, other chillers costconsiderably more to insure

Hermetic-motor burn-out can causecatastrophic damage to a chiller, requiringthat the entire chiller be cleaned, and therefrigerant replaced. YORK Millenniumchillers eliminate this risk by utilizing air-cooled motors. Refrigerant never comes in contact with the motor, preventing contamination of the rest of the chiller.

Insurance companies that offer policieson large air conditioning equipment considerair-cooled motors a significant advantageover hermetic refrigerant-cooled units.

UL and cUL acceptance—your assurance of reliability

YORK® Millennium® chillers are approvedfor listing by Underwriter’s Laboratories and the Canadian Underwriter’s Laboratory.Recognition of safety and reliability is yourassurance of trouble-free performance inday-to-day building operation.

Electronic starting—smoothand reliable

The electronic design of the optionalYORK Solid-State Starter provides the mostreliable motor starting system availabletoday. Compare this to old-fashionedelectromechanical starters, with mechanicalcontactors and linkages that can corrode orweld together.

The Solid-State Starter also improveschiller reliability. By “soft starting” the motor, it minimizes the damaging effects of sudden current inrush on the motor/compressor driveline.

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Reliable YORK open-drive motor design eliminates the possibility of a hermetic motor burn out, a catastrophic failure which may contaminate an entire chiller system.

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

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Factory packaging reducesfield labor costs

YORK® Millennium® screw chillers aredesigned to keep installation costs low.Where installation access is not a problem,the unit can be shipped completely packaged,requiring only three field installation steps:

1. Connect power leads to solid-statestarter disconnect switch.

2. Connect chilled and condenser water piping. Victaulic grooves require no on-site welding.

3. Connect chilled water flow switchand pump interlocks to control panel.

That’s it. No other screw chiller is quicker,easier, and less expensive to install. Mostrequire additional field labor to completethe following extra steps:

Flexibility that makesinstallation easier and faster

No additional field installation labor required

YORK Others

1. Additional water piping, valves, No Yesstrainers for centrifugal chiller purge unit

2. Additional oil cooler water No Yespiping, valves, strainers

3. Additional solid-state motor No Yesstarter

4. Additional thermometers No Yesand wells

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Flexible packaging for tight fitsIf access to the installation site is restricted, the Millennium® chiller can be shipped

with the driveline separate from the heat exchangers. For even tighter space restrictions,the evaporator and condenser heat exchangers can also be shipped separately. Virtuallyall installations can be accommodated without the need for costly and time-consumingmodifications to the building structure.

Designed to reduce on-site labor

Victaulic couplings eliminate on-sitewelding or pipe flanging.

Simple field wiring connections assurequick installation, reliable operation.

Factory-installed electronic sensors eliminate thermometer mounting on-site.

Antisweat insulation can be factory applied.

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OptiView Control Centerkeeps you on track

The OptiView Control Center providescomplete information on your chillers’operating condition.

Safety-shutdown information includesday, time, and cause of shutdown and typeof restart required—in English or severalother languages. Color coding of fault mes-sages allows easy determination of chillerstatus. Yellow messages are shut-downswith automatic restart with no operatorintervention required. Red messages aredisplayed for shut-downs requiring manualrestart, alerting an operator that a systemcheck may be required. A software test buttoneven allows you to verify the status of eachelectronic circuit board in the panel.

The Trending Screen shows changes inmotor current, oil temperature and pressure,refrigerant pressures, or water temperatures,which can be valuable indications of developing problems. This capability givesyou ample time to take corrective measuresbefore any expensive downtime is incurred.

With the graphic control center, you cansee when to schedule routine maintenancein advance of actual need.

No need to reprogram ifpower fails

The chiller operating system is a non-volatile EPROM, so no power backup isrequired. A factory-supplied lithium battery(11 years rated life) ensures safe storage of program setpoints without external power to the OptiView Control Center. As a result, restarts follow the parametersyou established before power was interrupted.

Open drive is reliable…andeasy to maintain

The hallmark of a YORK rotary screwchiller is the open-motor design—a provenconfiguration that continues on Millenniumchillers. Why? On hermetic designs, motorburnout can cause catastrophic damage.

When the motor “goes” in a hermeticallysealed chiller unit, the whole system,

Advanced YORK technologykeeps your maintenancecosts low

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The air-cooled Millennium motor eliminates this risk. Refrigerant nevercomes in contact with the motor, preventingcontamination of the rest of the chiller. As a result, downtime due to motor burnout isdramatically reduced.

Single-source responsibilityWith competitive chillers, service can

require shipping components to off-sitefacilities. With YORK, if any problem occurs,one call to YORK Service takes care of it all.That’s because the worldwide corps of YORKfactory-trained and factory-certified techni-cians is near you to help. In the unlikelyevent that replacement parts are needed, a complete stock is available from YORK.

UL reliabilityYORK Millennium chillers are approved

for listing by Underwriter’s Laboratories for the United States and Canada. Thisrecognition of safety and reliability is yourassurance of trouble-free performance inday-to-day operation.

essentially, goes with it. Because contamination is spread throughout theclosed loop, the entire system will need to be cleaned and overhauled.

You can’t afford to take shortcuts. Leavingeven minute amounts of contaminants inthe refrigerant stream can result in a quickre-occurrence of the burnout, even on a brand new motor.

If the motor is not replaced with a new one, it will have to be rewound andextensively repaired by the manufacturer.Cost of clean-up and motor replacement on an average-sized hermetically sealedsystem can easily exceed $45,000. Add the potential cost of temporary relocationfor employees and tenants while the systemis being repaired or the cost of a rentalchiller. Plus, time and labor of clean-upadministrative and management personnel—which is made more costly with EPA clean-air legislation regulating use and disposalof CFCs. Then, because systems that havehad one burnout are more likely to have a re-occurrence, you can expect to seeyour insurance costs rise.

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P.O. Box 1592, York, Pennsylvania USA 17405-1592 Tele. 800-861-1001Copyright by YORK International Corporation 2000 www.york.comForm 160.80-SG1 (600)

Subject to change without notice. Printed in the USA.ALL RIGHTS RESERVED

Proud Sponsorof the 2000U.S. Olympic Team

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