RTAA Packaged Air-Cooled Helical Rotary Liquid Chiller For High Ambient .

Trouble-Free Installation,Start-Up and OperationAdaptive Control MicroprocessorThe air-cooled Rotary chiller employsAdaptive Control Microprocessor. This isthe most advanced microprocessorcontrol available on any packaged waterchiller in the marketplace. So what is theAdaptive Control microprocessor? Adaptive Control means the Unit Control Module (UCM) directly senses the controlvariables that govern operation of thechiller: motor current draw, evaporatortemperature, condenser temperature, etc.If any of the variables approaches a limitcondition where the unit may be shutdown on a safety, the UCM takes corrective action to avoid shutdown and keepthe chiller operating. It does this throughcombined actions of compressor slidevalve modulation, electronic expansionvalve modulation and fan staging. Additionally, the UCM optimizes total unitpower consumption during normal operating conditions. No other chiller controlsystem in the marketplace offers this performance.Close Spacing Of ChillerThe air-cooled Rotary chiller has thetightest recommended side clearances in the industry, 1.8 meters,but that is not all. In situations whereequipment must be installed withless clearance than recommended,such as frequently occurs in retrofitand rooftop applications, restrictedair flow is common. Conventionalchillers may not work at all.However, the air-cooled Rotary chiller with its Adaptive Control microprocessor will simply make as muchchilled water as possible given theactual conditions. It will stay on lineduring any unforeseen abnormalconditions and optimize its performance. Consult your Trane salesengineer for more details.Improved chiller andmotor protectionThe control system integrates all thenecessary functions to ensure safe operation of the chiller in all applications andduty conditions : System safeties, such as oil, water,refrigerant pressure and temperaturefaults. Motor safeties. By monitoring themotor current on each of the 3 phases,the control system ensures protectionagainst :- Overload at start-up and in operation.- Phase loss/Power loss.- Phase unbalance or reversal.- Over/Undervoltage.- Welded contactors.If a fault occurs, one message will be displayed directly on the control module.CONTROLS ON OTHER CHILLERSWILL TYPICALLY SHUT DOWN THECHILLER, WHEN CHILLED WATER ISMOSTLY NEEDED.For example:A typical five-year-old chiller with dirtycoils might trip-out on high pressurecutout on a hot day in August. A hot dayis just when comfort cooling is neededthe most. In contrast, the air-cooled Rotary chiller with an Adaptive Control microprocessor will stage fans on, modulateelectronic expansion valve, and modulateslide valve as the chiller approaches ahigh pressure situation. Thereby KEEPING THE CHILLER ON-LINE JUSTWHEN YOU NEED IT THE MOST.The End Of Nuisance Trip-Outs AndUnnecessary Service Calls?Unnecessary service calls are avoided.The unit does not trip on nuisance orunnecessarily shuts down. Only when theUCM has exhausted all the correctiveactions it can take and if the unit is stillviolating an operating limit, the UCM willshut down the unit.Integrated Comfort system or aremote display panel, service problems can be identified and diagnosed remotly from the chiller.Unit mounted clear language display (UCM).Factory Testing MeansTrouble-Free Start-UpAll air-cooled Rotary chillers aregiven a complete functional test atthe factory. This is over and abovethe unit individual components testsdone prior final assembly of themachine. All the units are fully performance runtested before shipmentto verify capacity and power drawnunder full load conditions.2,40mLower Service ExpenseNuisance service calls are avoided.When there is a real problem thatmust be corrected, the UCM’s extensive diagnostics help to assure thatthe problem is quickly identified.Down time and service expense areminimized. And with the ability tocommunicate with the Trane71,80m

Superior ControlUnit Control Module FeaturesUnit Control ModuleTrane’s new Adaptive Control microprocessor control system enhances the aircooled Rotary chiller by providing thevery latest chiller control technology.Equal Compressor SequencingTrane maximizes both compressor andmotor life by equalizing the number ofstarts and the operating hours. The UCMwill start the compressor with the leastnumber of starts and turn off the compressor with the most operating hours.Conventional “auto” lead-lagcontrol will equalize starts, but runninghours will typically be unequal. Equalizing starts and running hours will provide equal compressor wear.State-of-the-Art EquipmentThe new 125 to 400 air-cooled chillersoffer the exclusive Trane AdaptiveControl logic with the Clear LanguageDisplay (UCM). The Clear Language Display has various functions that allow theoperator to read unit information andadjust setpoints. The Clear Language Display panel has 16 keys. The readoutscreen is a two-line, 40 character liquidcrystal with a backlight. The backlightallows the operator to read the display inlow-light conditions.Internal “Built-In” Chiller FlowProtectionThe UCM automatically detects a nowaterflow condition. An external flowswitch is not a necessity for the safe operation of the chiller.Remote MountedClear Language DisplayEasy Chiller System LoggingThe UCM displays data required to log thechiller system. The following information isavailable either as standard or as an optionwith the Air- Cooled Rotary Chiller microprocessor: Entering and leaving chilled water temperatures Ambient air temperature Evaporator and condenser refrigeranttemperatures and pressures Compressor suction temperature Percent RLA for each compressor Percent line voltage Compressor starts and running hours Active setpoints:chilled water setpointcurrent limit setpointlow ambient lockout setpoint Over 90 diagnostic and operating conditions Part failure diagnostics:water temperature sensorsrefrigerant temperature sensorscompressor contactorsRemote Display PanelTrane air-cooled Rotary chillers are available with a twisted pair connection to anoptional remote display panel. Chiller operation can be controlled similarly to thecontrol interface on the chiller itself.Through a twisted pair of wires the unit canbe turned on or off, change the chilledwater setpoint, and display over 90 operating and diagnostic conditions. The remotedisplay panel can be mounted indoors, so,all can be accessed without the need to goto the chillers plant room.Remote clear language display has theability to control multiple units. In a multiple unit configuration, the Remote ClearLanguage Display Panel has the capability to communicate with up to four units.Each unit requires a separate communication link with the Remote DisplayPanel.Easy Interface To The BuildingManagement SystemInterfacing the air-cooled Rotary chillerwith building management systems isstate-of-the-art, yet simple.Chiller inputs include: Chiller enable/disable Circuit enable/disable Chilled water setpoint Current limit setpointChiller outputs include: Compressor running indication Alarm indication (CKt 1/CKt2) Maximum capacity8Trane Chiller Plant Manager ICSThe Tracer Chiller Plant Manager Building Management System provides building automation and energy managementfunctions through stand- alone control.The Chiller Plant Manager is capable ofmonitoring and controlling your entirechiller plant system.Application software available: Time-of-day scheduling Duty cycle Demand limiting Chiller sequencing Process control language Boolean processing Zone control Reports and logs Custom messages Run time and maintenance Trend log Totalizing PID control loopsAnd of course, Trane’s Chiller PlantManager Panel can be used on a standalone basis or tied into a complete Building Automation System.

General Data 200 SeriesTable 1 - General Data 200 seriesRTAA21350 Hz21460 Hz50 Hz21560 Hz50 Hz21660 Hz50 Hz21760 Hz50 Hz60 HzCompressorQuantityModelCHHBNb of elES120140140170140170170200170Water capacityGallons28717158715858545854Min Water FlowGPM159176176204176204204239204239Max Water 1681681681681683333333333CondenserModelNumber of FansFins / FtN of RowsCondenser FansStandard Low NoiseAir 103930113390Fan SpeedRPM91511309151130915113091511309151130Fan /032/032/032/032/032/032/032/032/032/0General UnitRefrigerant ChargeOil ChargeMin Starting/Oper AmbientStd Unit( F/C)Shipping WeightWith AL. Cds Finskg3795429543704500443546104590491046704910With CU Cds Finskg4245483549105040497551505130564052105650With AL. Cds Finskg3900457046404720471048304810513048905130With CU Cds ating 022202220Water Connection Diam.mmFlange N150PN16PN16PN16PN16PN16PN16PN16PN16PN16PN16Note: Data containing information on two circuits shown as follows: Ckt1/Ckt29

General Data 300 SeriesTable 2 - General Data 300 seriesRTAA32232432850 Hz60 Hz50 Hz60 Hz50 Hz60 Hz33333370 70/8570 70/8585 85/10085 85/100100 100/100100 100/100222222250CompressorQuantityModelCHHBNb of circuitsEvaporatorModelES225225225225250Water capacityGallons117117117117110110Min Water FlowGPM275275275275307307Max Water denserModelNumber of FansFins / FtN of 2168/1923/23/23/23/23/23/2Condenser FansStandard Low NoiseAir FlowCFM126470145430148700170910160440184400Fan SpeedRPM915113091511309151130Fan Diametermm762762762762762762General UnitRefrigerant ChargeOil Chargekg94/5394/53117/53117/53120/55120/55Liters15 15/1715 15/1717 17/2017 17/2020 20/2020 20/2032/032/032/032/032/032/0Min Starting/Oper AmbientStd Unit( F/C)Shipping WeightWith AL. Cds Finskg636063606885688568856885With CU Cds Finskg691569157505750575057505With AL. Cds Finskg680068007285728572857285With CU Cds Finskg735573557905790579057905Operating 18321832183168.3168.3168.3168.3168.3168.3Water Connection Diam.mmVICTAULICConnection typeNote: Data containing information on two circuits shown as follows: Ckt1/Ckt210

General Data 400 SeriesTable 3 - General Data 400 seriesRTAA43043250 Hz60 Hz50 Hz43460 Hz50 Hz60 Hz44CompressorQuantityModelCHHBNb of circuits444485 85/85 8585 85/85 8585 85/100 10085 85/100 100222222340100 100/100 100 100 100/100 100EvaporatorModelES300300300300340Water capacityGallons176176176176162162Min Water FlowGPM360360360360400400Max Water 0432432434434Number of Fans161618182020Fins / Ft168168168168168168333333N of RowsCondenser FansStandard Low NoiseAir FlowCFM174300200460186040213950197780227440Fan SpeedRPM915113091511309151130Fan 6116/116120/120120/120Liters17 17/17 1717 17/17 1717 17/20 2017 17/20 2020 20/20 2020 20/20 2032/032/032/032/032/032/0General UnitRefrigerant ChargeOil ChargeMin Starting/Oper AmbientStd Unit( F/C)Shipping WeightWith AL. Cds Finskg911091109110911091109110With CU Cds Finskg997099709970997099709970Operating WeightWith AL. Cds Finskg975097509750975097509750With CU Cds .3168.3168.3168.3DimensionsWater Connection Diam.InchVICTAULICConnection typeNote: Data containing information on two circuits shown as follows: Ckt1/Ckt211

Selection ProcedureThe chiller capacity tables presented onpages 18 to 25 cover the most frequentlyencountered leaving water temperatures.The tables reflect a 10 F (5,6 C) temperature drop through the evaporator. Fortemperature drops other than 10 F(5,6 C), refer to Table 4, and apply theappropriate Performance Data Adjustment Factors.To select a Trane air-cooled Rotary chiller, the following information is required:1. Design load in tons of refrigeration2. Design chilled water temperature drop3. Design leaving chilled water temperature4. Design ambient temperatureEvaporator flow rates can be determinedby using the following formulas:Tons x 24GPM Temperature Drop ( F)ORL/S kW (Capacity) x .239Temperature Drop ( C)NOTE: Flow rates must fall within thelimits specified in Tables 1,2 and 3 (forGPM).Selection ExampleGiven:Required System Load 140 TonsLeaving Chilled Water Temperature(LCWT) 45 FChilled Water Temperature Drop 10 FDesign Ambient Temperature 95 FEvaporator Fouling Factor 0.000251. From Table 5 (RTAA PerformanceData)50 Hz, RTAA-214 at the givenconditions will produce 141 tons with acompressor power input of 149 kWand a unit EER of 10.3.2. To calculate the required chilled waterflow rate we use the formula givenbelow:GPM 141 Tons x 24 338 GPM10 F3. To determine the evaporator pressuredrop we use the flow rate (GPM) andthe evaporator water pressure dropcurves, page 17. Entering the curve at338 GPM, the pressure drop for anominal 140 ton evaporator is 11.5feet.4. For selection of applications where thealtitude is significantly greater thansea level or the temperature drop isdifferent than 10 F, the performanceadjustment factors from Table 4should be applied at this point.125. The final unit selection is: QTY (1) RTAA 214 Cooling Capacity 141 tons Entering/Leaving Chilled WaterTemperatures 55/45 F Chilled Water Flow Rate 338GPM Evaporator Water Pressure Drop 11.5 ft. H2O Compressor Power Input 149kW Unit EER 10.3Minimum Leaving Chilled WaterTemperature SetpointThe minimum leaving chilled water temperature setpoint for water is 40 F. Forthose applications requiring lower setpoints, a glycol solution must be used.Contact the local Trane sales office foradditional information.

Application ConsiderationsApplication ConsiderationsCertain application constraints should beconsidered when sizing, selecting andinstalling Trane air-cooled Rotary chillers. Unit and system reliability are oftendependent upon properly and completelycomplying with these considerations.Where the application varies from theguidelines presented, it should be reviewed with your local Trane sales office.Unit SizingUnit capacities are listed in the performance data section. Intentionally oversizing a unit to assure adequate capacity isnot recommended. Erratic system operation and excessive compressor cyclingare often a direct result of an oversizedchiller. In addition, an oversized unit isusually more expensive to purchase, install, and operate. If oversizing is desired,consider using two units.Unit Placement1. Setting The UnitA base or foundation is not required ifthe selected unit location is level andstrong enough to support the unit operating weight as listed in Table 15.2. Isolation and Sound EmissionThe most effective form of isolation isto locate the unit away from anysound-sensitive area. Structurallytransmitted sound can be reduced byELASTOMERIC vibration eliminators.Spring isolators have proven to be oflittle additional benefit when compareto elastomeric vibration eliminators.An acoustical engineer should alwaysbe consulted in critical sound applications.For maximum isolation effect, waterlines and electrical conduit should alsobe isolated. Wall sleeves and rubberisolated pipes hangers can be used toreduce the sound transmitted throughwater piping. To reduce the soundtransmitted through electrical conduit,use flexible electrical conduit.State and local codes on sound emissions should always be considered.Since the environment in which asound source is located affects soundpressure, unit placement must becarefully evaluated. Sound powerlevels for Trane air-cooled Rotary chillers are available on request.3. ServicingAdequate clearance for evaporator andcompressor servicing should be provided. Recommended minimum spaceenvelopes for servicing are located inthe dimensional data section and canserve as a guideline for providing adequate clearance. The minimum spaceenvelopes also allow for control panelswing and routine maintenance requirements. Local code requirementsmay take precedence.4. Unit Locationa. GeneralUnobstructed flow of condenser air isessential to maintain chiller capacityand operating efficiency. When determining unit placement, careful consideration must be given to assure a sufficient flow of air across the condenserheat transfer surface. Two detrimentalconditions are possible and must beavoided if optimum performance is tobe achieved: warm air recirculationand coil starvation.Warm air recirculation occurs whendischarge air from the condenser fansis recycled back to the condenser coilinlet. Coil starvation occurs when freeairflow to the condenser is restricted.Both warm air recirculation and coilstarvation cause reductions in unit efficiency and capacity because of theassociated higher head pressures. Theair-cooled Rotary chiller offers anadvantage over competitive equipmentin these situations. Performance isminimally affected in many restrictedair flow situations due to its uniquecondensing coil geometry. Also,through its advanced Adaptive Controlmicroprocessor logic, the chiller willstay on-line where competitive chillerswould shut down.Trane’s unique Adaptive Controlmicroprocessor has the ability tounderstand the operating environmentof the chiller and adapt to it by firstoptimizing its performance andsecond, staying on line during abnormal conditions. For example, highambient temperatures combined witha restricted air flow situation will generally not lead the air-cooled Rotarychiller to shut down.13Debris, trash, supplies, etc. should notbe allowed to accumulate in the vicinity of the air-cooled Rotary chiller. Supply air movement may draw debrisinto the condenser coil, blockingspaces between coil fins and causingcoil starvation.

b. Provide Vertical ClearanceVertical condenser air discharge mustbe unobstructed. While it is difficult topredict the degree of warm air circulation, a unit installed as shown on theleft would have its capacity and efficiency significantly reduced.Performance data are based on free airdischarge.c. Provide Lateral ClearanceThe condenser coil inlet must not beobstructed. A unit installed closer thanthe minimum recommended distanceto a wall or other vertical riser mayexperience a combination of coil starvation and warm air recirculation, thuscausing reduction in unit capacity andefficiency reductions. Once again, theAdaptive Control microprocessor willallow the chiller to stay on line, producing the maximum available capacity,even at less than recommended lateralclearances.The recommended lateral clearancesare shown in the dimensional data section.d. Provide Sufficient Unit-to-UnitClearanceUnits should be separated from eachother by a sufficient distance to prevent warm air recirculation or coil starvation. The air-cooled Rotary chillerhas the lowest recommended unit-tounit clearance in the industry, 2.4meters. Consult the local Trane salesoffice for applications concerning closer spacings and restricted airflowssituations.e. Walled Enclosure InstallationsWhen the unit is placed in an enclosure or small depression, the top of thefans should be no lower than the topof the enclosure or depression. If theyare, consideration should be given toducting the top of the unit. Such applications should always be reviewedwith the local Trane sales office.Water TreatmentDirt, scale, products of corrosion andother foreign material will adverselyaffect heat transfer between the waterand system components. Foreign matterin the chilled water system can alsoincrease pressure drop and, consequently, reduce waterflow. Proper water treatment must be determined locally, depending on the type of system and localwater characteristics.Neither salt nor brackish water is recommended for use in Trane air-cooled Rotary chillers. The Trane Company encourages the employment of a reputablewater treatment specialist, familiar withlocal water conditions, to assist in establishing the proper water treatment program.The capacities given in the performancedata section of this catalog are based onwater with a fouling factor of .00025. Forcapacities at other fouling factors, seeadjustment factors in Table 4.Effect Of Altitude On CapacityAir-cooled Rotary chiller capacities givenin the performance data tables, (Tables 5through 12), are at sea level. For elevations substantially higher than sea level,the decreased air density will decreasecondenser capacity and, therefore, unitcapacity and efficiency. The adjustmentfactors in Table 4 can be applied directlyto the catalog performance data to determine the unit’s adjusted performance.Ambient LimitationsTrane air-cooled Rotary chillers are designed for year-round applications inambients from 32 F to 125 F.The minimum ambient temperatures arebased on still weather conditions (windsnot exceeding five mph). Greater windvelocities will result in a drop in headpressure, therefore increasing the minimum starting and operating ambient temperature. Once again, the AdaptiveControl microprocessor will keep thechiller on line when high or low ambientconditions exist, making every effort toavoid nuisance trip-outs and provide themaximum allowable tonnage.14Waterflow Limits

The air-cooled Rotary chiller utilizes two, three, or four Trane Helirotor compres-sors that operate on two refrigeration cir-cuits. The tonnages of these compressors are 70, 85, and 100 ton, and they are grouped together in different configura-tions to make up the air-cooled product line from 125 to 400 tons. Trane air-cooled Helirotor compressors