Model YVAA Air Cooled Screw Compressor Liquid Chillers With Variable .
FORM 201.28-EG1.EN.PED/CE (1111)Model YVAA Air Cooled Screw Compressor Liquid Chillerswith Variable Speed DriveStyle A525 - 1225 kW2 Compressor50 HzHFC-134a
FORM 201.28-EG1.EN.PED/CE (1111)FORM 201.28-EG1.EN.PED/CE (1111). 1Introduction. 3Ratings . 4Product Description . 4MicroComputer Control Center . 6Accessories and Options . 7Refrigerant Piping Layout. 10Application Data .11Physical Data . 14Evaporator Options . 16Dimensions . 17Electrical Data . 18Power Wiring. 19Customer Control Wiring . 20NOMENCLATUREYVAA 074 3AXX 50 AA12345BASE PRODUCT TYPEY: YorkV: VariableAA2speed screw: Air cooled: Design series67FRAME SIZE###89101112CONFIGURATION#: Condenser code#: Evaporator code##1214VOLTAGE50: 380-415 / 3 / 5015LEVEL / REFRIGERANTA: Development Level AA: Refrigerant R134a: Compressor code: Condenser fan &sound kit codeJOHNSON CONTROLS
IntroductionFor over 135 years, Johnson Controls has raised thebar of chiller design and customer expectations. We areraising the bar again with a leap forward in air-cooledchiller technology. Continuing the history of innovation inboth compressor design and Variable Speed Drive (VSD)technology, Johnson Controls proudly introduces theYORK YVAA.In the past, the choice to use an air-cooled chiller camewith the expectation of compromise, where simplicity ofdesign and maintenance were traded for performanceand efficiency. The new YVAA provides a better balanceby combining the best of both - a high performance designthat minimizes the total cost of ownership.YORK YVAA model air-cooled chillers provide superiorperformance. Higher efficiency heat exchangers coupledwith variable speed operation and smart controls elevatethe system efficiency to a whole new level. The resultingbenefit from YVAA chillers is much greater than the sumof its parts.Efficiency: Reduce your consumptionYVAA chillers are Johnson Controls’ most efficient aircooled chillers. The design offers a lighter, smaller andquieter package that minimizes the installed cost andmaximizes usable building space. YVAA chillers are simplerin design with easy access to service components forreliable operation and efficient maintenance. With up to a40% improvement in real world efficiency versus currentproducts, YVAA sets the new standards for lowering energyuse.JOHNSON CONTROLSFORM 201.28-EG1.EN.PED/CE (1111)Sustainability: Improve your environmental footprintYVAA lowers both direct and indirect impact on theenvironment. It uses R134a refrigerant which has zeroozone depletion potential (ODP). The design minimizesthe quantity of refrigerant used in the system.The highest portion of green house gases is carbon dioxidegenerated from electric power plants. HVAC systems areone of the largest consumers of electricity in commercialbuildings. YVAA chillers reduce the electricity usage,thereby contributing to reducing greenhouse gases andhelping keep the planet cool.Low Sound: Quiet operation makes you a goodneighbourThe variable speed technology on YVAA allows unparalleledlow sound levels at off peak design conditions. Thismakes YVAA a great solution for sound sensitive zones.Several acoustic attenuation options with smart controls(SilentNight ), aerodynamic fans and effective soundenclosures will meet the sound levels required.Confidence: Proven performance provides peace ofmindYVAA design is proven by years of success with theprevious generation of VSD air-cooled screw chillers withthousands of machines operating in more than one hundredcountries.YVAA is configurable to be the perfect fit for your uniqueneeds. YVAA offers an array of options that can be tailoredand tuned to match the capacity, efficiency, sound andfootprint for your specific application. Several variationsof condenser fans, evaporator arrangements, sound kits,protection enclosures, and controls schemes are availableto meet specific requirements for your site.3
FORM 201.28-EG1.EN.PED/CE (1111)RatingsCOMPUTERIZED PERFORMANCE RATINGSOFF-DESIGN PERFORMANCEEach chiller is custom-matched to meet the individualbuilding load and energy requirements. A variety ofstandard heat exchangers and pass arrangements areavailable to provide the best possible match.Since the vast majority of its operating hours are spent atoff-design conditions, a chiller should be chosen not only tomeet the full load design, but also for its ability to performefficiently at lower loads. It is not uncommon for chillerswith the same full load kW/kW to have an operating costdifference of over 10% due to part-load operation.It is not practical to provide tabulated performance for eachcombination, as the energy requirements at both full andpart load vary significantly with each heat exchanger andpass arrangement. Computerized ratings are availablethrough each Johnson Controls sales office.Part load information can be easily and accuratelygenerated by use of the computer. And because it is soimportant to an owner’s operating budget, this informationhas now been standardized.A more detailed analysis must take into account actualbuilding load profiles, and local weather data. Part loadperformance data should be obtained for each job usingits own design criteria.Product DescriptionYVAA air-cooled chillers are completely assembled withall interconnecting refrigerant piping and internal wiring,ready for field installation. The unit is pressure tested,evacuated, and fully factory charged with refrigerantR134a and oil in each of the independent refrigerantcircuits. After assembly, an operational test is performedwith water flowing through the evaporator to ensure thateach refrigerant circuit operates correctly.The unit structure is manufactured from heavy gauge,galvanised steel and coated with baked-on powderpaint (colour Champagne ((RAL 7006), (Munsel No.9.8YR4.36/1.2)).YVAA chillers are designed within EN ISO 9001 andbuilt within an EN ISO 9002 accredited manufacturingorganisation.Chillers conform with the following European Directives: Machinery directive (2006/42/EC)EMC Directive (2004/108/EC)Pressure Equipment Directive (97/23/EC)Safety Code for Mechanical Refrigeration(EN378-2 (2008))FLUORINATED GREENHOUSE GASESThis equipment contains fluorinated greenhouse gasescovered by the Kyoto Protocol. The global warming potential of the refrigerant(R134a) used in this unit is 1300.The refrigerant quantity is stated in the PhysicalData table in this document.The fluorinated greenhouse gases in this equipmentmay not be vented to the atmosphere.This equipment should only be serviced by qualifiedtechnicians.SEMI-HERMETIC YORK TWIN-SCREW COMPRESSORSCompressors are direct drive, semi-hermetic, rotary twinscrew type, including: muffler, temperature actuated ‘offcycle’ heater, IP55 terminal board and precision machinedcast iron housing.Reliable suction gas cooled, high efficiency, accessiblehermetic compressor motor, full suction gas flow throughmesh screen filter, with inherent internal thermal overloadprotection and external current overload on all threephases.Continuous function, microprocessor controlled, VariableSpeed Drive (VSD) shall provide valve-less, smoothcapacity control from 100% down to 10% of chillercapacity.In addition, elimination of the slide valve and associatedunloading components has resulted in a 50% reductionin compressor moving parts.4JOHNSON CONTROLS
Product Description - continuedFORM 201.28-EG1.EN.PED/CE (1111)EVAPORATORELECTRICALThe evaporator is a shell and tube, hybrid falling film typeheat exchanger. It contains a balance of flooded andfalling film technology to optimize efficiency, minimizerefrigerant charge, and maintain reliable control. Aspecifically designed distribution system provides uniformrefrigerant flow for optimum performance.YORK has over 25 years of experience designing variable-speed drives specifically for chiller applications. Theresult is an extremely reliable air-cooled chiller system thatoffers industry leading efficiency at real world operatingconditions, valve-less compressor loading/unloading,excellent capacity control, high power factor and soft start.CONDENSERIncoming single point power is standard utilizing a lockablecircuit breaker, 115 Vac control transformer, VSD, fancontactors, ON/OFF unit switch, microcomputer keypadand display, Chiller Control and VSD Logic boards, andrelay boards.The YVAA introduces micro-channel coil to the York screwcompressor chiller line. The micro-channel maximizescondenser heat transfer, resulting in a smaller footprint,and reduces refrigerant charge by as much as 50%.Each condenser coil is a single piece all aluminiumconstruction including headers, tubes and fins to avoidgalvanic corrosion due to dissimilar metals. Coils andheaders are brazed as one piece. Integral sub-cooling isincluded. The design working pressure is 43 bar.Multiple, standard low sound, high efficiency, TEAOmotor driven fans move air through the coils. They aredynamically and statically balanced, direct drive withcorrosion-resistant glass fibre reinforced composite bladesmoulded into low-noise, full airfoil cross sections, providingvertical air discharge from extended orifices for efficiencyand low sound.Fan motors are Totally Enclosed Air-Over (TEAO),squirrel-cage type and current protected. The direct drivemotors feature double-sealed and permanently lubricatedball bearings, cutting down on maintenance cost over thelife of the unit.Standard design includes IP55 rating, powder paintedsteel cabinet with hinged, latched, and gasket sealedouter doors equipped with wind struts for safer servicing.The panel includes a control display access door so thatdisplay and control features can be accessed withoutopening main cabinet doors.All exposed power wiring is routed through liquid-tight,UV-stabilized, non-metallic conduit.BUILDING AUTOMATION SYSTEM CAPABILITIESThe E-Link Gateway provides an economical and versatileconnection between York equipment and open/standardprotocols. It efficiently manages the communicationprotocols currently used by York equipment, exposing thedata in a consistent, organized, and defined fashion. TheE-Link Gateway is available as a field-installed option onYVAA. A simple switch selection allows configuration ofthe required equipment profile and output protocol, whichreduces equipment connectivity startup time.REFRIGERANT CIRCUITAn independent refrigerant circuit is provided percompressor. Each circuit uses copper refrigerant pipeformed on computer controlled bending machines toreduce the number of brazed joints resulting in a reliableand leak resistant system. Discharge lines are provided with a manual compressor shutoff service valve (See Options and Accessoriesfor suction line service valve).The external oil separators, with no moving parts anddesigned for minimum oil carry-over, are mounted inthe discharge line of the compressor.Liquid line components include: high absorption removable core filter-drier, sight glasses with moistureindicators, manual shut-off valve with charging port,orifice and electronic expansion valve.An economizer (flash) tank is located in each refrigerant circuit to increase the system efficiency. The designworking pressure is 31 bar.JOHNSON CONTROLS5
MicroComputer Control CenterFORM 201.28-EG1.EN.PED/CE (1111)FIG.1 – VIEW OF YORK CONTROL CENTER USER INTERFACEMICROCOMPUTER CONTROL CENTERThe microcomputer control center (see Figure 1) providesautomatic control of chiller operation including compressorstart/ stop and load/unload anti-recycle timers, condenserfans, evaporator pump, evaporator heater, unit alarmcontacts and run signal contacts. The microcomputercontrol center comes online as soon as the main powerswitch on the unit is switched on; immediately, themicrocomputer control center will begin to check allvariables with a frequency ranging from 30 seconds toalmost continuous monitoring.The microprocessor controls the unit’s capacity bymatching the actual leaving chilled liquid temperature(LCHLT) to the user-defined setpoint. Factors that maycause the system’s actual LCHLT to fluctuate are changesin ambient temperature, loop flow rate, load, and loopvolume. The control system reacts to such changes byadjusting the number of compressors that are on and theloading of each compressor in order to keep the LCHLTat the setpoint.The control system logic monitors the rate at which theLCHLT is approaching the setpoint to ramp up or downcompressor capacity as required. The variable frequencydrive allows the compressor capacity to match the load.Display Data Leaving Chilled Liquid Temperature Returning Liquid Temperature Ambient Temperature Lead System Compressor Capacity (% of Full Load Amps) VSD Output Frequency / Compressor Speed Compressor Run Hours Compressor Number of Starts Oil Pressure and Temperature (per Compressor)6 Evaporator Pump StatusEvaporator Heater StatusHistory Data for Last Twenty Normal ShutdownsHistory Data for Last Ten Shutdown FaultsProgrammable Setpoints Chiller On/Off Chilled Liquid (Water or Glycol) Local or Remote Control Units of Measure (Imperial or SI) System Lead / Lag Remote Temperature Reset Remote Current Limit Leaving Chilled Liquid Temperature Setpoint andRangeJohnson Controls’ systems or another vendor’s systemscan incorporate these setpoints and data outputs to givethe customer a complete understanding of how the systemis running through a Building Automation System.Extreme Conditions - During extreme or unusualconditions (i.e. blocked condenser coils, ambient abovescheduled maximum, etc.) the chiller control system willavoid shutdown by varying capacity. By monitoring motorcurrent and suction and discharge pressures, the chillercan maintain maximum available cooling output withoutshutting down.Unit Safeties are provided for the chiller to perform autoreset shut down for the following conditions: Ambient temperature above or below allowable range Out of range leaving chilled liquid temperature Under voltage Flow switch operationJOHNSON CONTROLS
Accessories and OptionsAll options factory mounted unless otherwise noted.SOUND ATTENUATIONLOW NOISE KITS – The standard chiller configuration isequipped with low sound fans and acoustic treatments onthe refrigerant lines and compressors. There are severalsound attenuation options available to further reducesound at its source thereby meeting local sound levelregulations.SilentNight - Due to time of day based soundregulations in some locations it may be desirable toforce the chiller to a lower sound level on demand. TheSilentNight control option provides a control input to limitsound output of the chiller based on time of day. Thisfeature is programmable at the chiller panel or can becontrolled remotely via a signal (4-20 mA or 0-10 VDC)from a BAS system.FAN OPTIONSULTRA QUIET FANS – The chiller is equipped withspecially designed fans and motors to provide lowersound levels yet retain appropriate airflow. The result isreduced fan generated sound with minimal effect on thechiller capacity or efficiency.HIGH STATIC FANS - The chiller is equipped withcondenser fans with higher power motors suitable forhigh external static pressure, up to 100 Pa (0.4 in. water),across condenser coils. This option should be selectedif additional airflow resistance may be present due toflow restrictions such as field installed ducts, filters,sound enclosures etc. Please contact your local JCIrepresentative for more information.HIGH AIRFLOW FANS - The chiller is equipped withcondenser fans with airfoil type blades and high powermotors providing extra airflow across coils. In some chillerconfigurations, this option can provide an increase inchiller capacity at high ambient. The high airflow fans arealso available with variable speed control. Please contactyour local JCI representative for more information.CONDENSER COIL PROTECTIONThe aluminium alloys used in the YVAA micro-channelcondenser have been carefully selected and testedfor high corrosion resistance. However, all metals cancorrode in harsh conditions. Consider protecting coilsfrom corrosive environments such as coastal, marine,urban and industrial.JOHNSON CONTROLSFORM 201.28-EG1.EN.PED/CE (1111)POST-COATED EPOXY DIPPED CONDENSER – Microchannel condenser coils applied with electro-depositedand baked flexible epoxy coating that is finished with apolyurethane UV resistant top-coat suitable for highlycorrosive applications.PROTECTIVE CHILLER PANELSWIRE PANELS – UV stabilized black polyvinyl chloridecoated, heavy gauge, welded wire mesh guards mountedon the exterior of the full unit. Protects condenser coilfaces and prevents unauthorized access to refrigerantcomponents (compressors, pipes, evaporator, etc.), yetprovides free air flow. This can cut installation cost byeliminating the need for separate, expensive fencing.See Figure 2.LOUVERED PANELS – Louvered panels, painted thesame colour as the unit, enclose the unit to visually screenand protect the coils as well as preventing unauthorizedaccess to internal components. Also available as acondenser-only option. See Figures 3 and 4.LOUVERED/WIRE PANELS COMBINATION - Louveredpanels, painted the same colour as the unit, are mountedon external condenser coil faces. Heavy gauge, weldedwire-mesh panels, coated to resist corrosion, are mountedaround base of machine to restrict unauthorized access.See Figure 5.END HAIL GUARD – Louvered panels, painted the samecolour as the unit, are installed on the rear of the unit(opposite end of the control panel) to protect the exposedcondenser from flying debris or hail. See Figure 6.V-GUARD PANELS – Solid panels, painted the samecolour as the unit, are installed along the sides of theunits to cover exposed piping within the condensersection without impacting airflow. These guard panels canbe combined with End Hail Guard option for additionalprotection from debris. See Figure 7.EVAPORATOR OPTIONS:38 mm INSULATION – Double thickness insulationprovided.FLANGE KIT – Provides contractor with the couplingsbest suited to tie into the chilled water piping. All flangesare PN10.CONNECTION LOCATION - The standard unitconfiguration is available with fluid inlet connections atrear (opposite control panel end) of unit. Option availablefor front fluid inlet on select configurations.7
FORM 201.28-EG1.EN.PED/CE (1111)Accessories and Options - continuedFIG. 2 – FULL UNIT WIRE PANELSFIG.5 – LOUVERED/WIRE PANELS COMBINATIONFIG. 3 – FULL UNIT LOUVERED PANELSFIG. 6 – END HAIL GUARDFIG. 4 – CONDENSERS-ONLY LOUVERED PANELSFIG. 7 – V-GUARD OPTION8JOHNSON CONTROLS
FORM 201.28-EG1.EN.PED/CE (1111)Accessories and Options - continuedTHREE-PASS – The standard evaporator is constructedwith two chilled water passes through the evaporator.The three-pass option is recommended for use in brineapplications or where a greater water temperaturedifference is required but efficiency cannot be sacrificed.WATER BOX HEATER - The standard unit comes withfreeze protection on the evaporator down to -17.8 C (0 F).The waterbox heater option provides additional freezeprotection down to -28 C(-20 F).CONTROLS OPTIONS:HIGH AMBIENT OPERATION – This provides specialcontrol logic coupled with high airflow fans to permit highambient (up to 52 C (125 F)) operation. Fans are airfoiltype blades with high power motors. This option mayalso allow for increased machine capacity, allowing theselection of a smaller chassis to meet specific capacityrequirements.BUILDING AUTOMATION SYSTEM INTERFACE(TEMPERATURE) - Factory installed option to accept a4 to 20 mA or a 0 to 10 VDC input to allow remote resetof the Leaving Chilled Liquid Temperature Setpoint. Thesetpoint can be positively offset upwards up to 22.2 C(40 F). This option is useful for ice storage or processapplications or for periods where higher chilled liquidtemperatures are adequate for low loads. Available aloneor in combination with BAS Load Limit.BUILDING AUTOMATION SYSTEM INTERFACE (LOADLIMIT) - Factory installed option to accept a 4 to 20 mAor a 0 to 10 VDC input to allow remote reset of the LoadLimit Setpoint. The setpoint can limit system demandfrom 30-100%. Available alone or in combination withBAS Temperature Reset.E-Link – The E-Link gateway provides communicationor Building Automation Systems, including BACnet (MS/TP), Modbus, LON and N2.THERMAL STORAGE – Provides special control logicand modifications to produce leaving chilled brinetemperatures below 4.4 C (40 F) primarily at timesof low ambient temperatures (night time). Option canbe used to produce ice to supplement cooling andsignificantly decrease energy costs. The capability of thechiller is enhanced by using both ice and chilled watersimultaneously during times of peak cooling needs.JOHNSON CONTROLSGENERAL OPTIONS:FLOW SWITCH ACCESSORY - Vapor proof SPDT, NEMA3R switch, 10.3 barg (150 psig) DWP, -29 C to 121 C(-20 F to 250 F) with 1" NPT (IPS) connection for uprightmounting in horizontal pipe (This flow switch or equivalentmust be furnished with each unit). Field mounted.DIFFERENTIAL PRESSURE SWITCH – This 0.2-3barg (3-45 psig) range switch, with 1/4" NPTE pressureconnections, is an alternative to the paddle-type flowswitch. Field mounted.SERVICE ISOLATION VALVE – Servic
Model YVAA Air Cooled Screw Compressor Liquid Chillers with Variable Speed Drive Style A 525 - 1225 kW 2 Compressor 50 Hz HFC-134a. FORM 201.28-EG1.EN.PED/CE (1111) . YVAA air-cooled chillers are completely assembled with all interconnecting refrigerant piping and internal wiring,
Model YVAA . Air-Cooled Screw Compressor Liquid Chillers With Variable Speed Drive. Style A. 150-500 Tons. 525-1750 kW 2 Compressor. 50 and 60 Hz HFC-134a
bar of chiller design and customer expectations. We are raising the bar again with a leap forward in air-cooled chiller technology. Continuing the history of innovation in both compressor design and Variable Speed Drive (VSD) technology, Johnson Controls proudly introduces the YORK YVAA. In the past, the
Air-Cooled Screw Compressor Liquid Chillers With Variable Speed Drive. Style A. 150-500 Tons. 525-1750 kW 2 Compressor. 50 and 60 Hz HFC-134a. FORM 201.28-EG1 (915) JOHNSON CONTROLS. . air-cooled screw chillers with thousands of machines operating in more than one hundred . countries.
Maximum Series portable chillers can be used on a variety of process applications that require 20 F to 80 F chilled water. MAXIMUM SERIES † Air & Water-Cooled † 1/4 to 40 Tons † 20 F to 80 F † Using Non-Ozone Depleting Refrigerants 10 ton air-cooled model 10 ton water-cooled model 2 ton water-cooled model 1 ton air-cooled model
Air-cooled chillers are used to produce chilled water to air-side systems such as primary air fan coil systems, constant air volume systems and variable air volume systems in different zones of the building. An air-cooled screw chiller generally comprises a shell and tube evaporator, an air-cooled condenser with
Air Cooled Chiller Air Air 2 Air Air 6 AIR COOLED CHILLERS Air-cooled chillers are refrigeration machines that remove heat from cooling loads using chilled water and reject this heat into the atmosphere using refrigerant. THEY ALL HAVE fans, condenser coils, and compressors. Air-cooled chillers are used to provide cooling for human comfort and electronic equipment as well as industrial process .
YVAA Air Cooled Screw Chiller* This three-day course teaches experienced service technicians about the YVAA Chiller. The course will include features of this unit and the differences in installation, operation and maintenance from the YCAV. Recommended Prerequisites: Working knowledge of the YCAV/YCIV Chiller Working knowledge of VSDs
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