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Product CatalogAir-Cooled Scroll ChillersModel CGAM — Made in USA20 to 130 NominalTons (60 Hz and 50 Hz)July 2017CG-PRC017N-EN

IntroductionDesign and manufacturing excellence makesTrane a leader in the air-cooled chiller market place.This tradition of using excellence to meet market demands is illustrated with theTrane 20 to 130ton air-cooled scroll chiller.This next-generation chiller is an exciting step forward in energyefficiency, sound, reliability, ease of serviceability, control precision, application versatility, andoperational cost-effectiveness.The chiller is designed to deliver provenTrane performance basedon the redesign of a European model that has been a market leader, plus all the benefits of newheat transfer and fan designs, as well as, low-speed, direct-drive scroll compressors.Important Design Features and New Features Higher full-load and part-load energy efficiency that exceed ASHRAE 90.1 and reduce operatingcosts Significantly lower noise levels than other scroll compressor chillers. R-410A optimized design. Flow switch and water strainer are factory installed in the optimum locations for seamlessoperation and reduced chiller installation and maintenance time. Tracer CH530 with Adaptive Control has improved fan algorithms for more reliableoperation at extreme conditions. Single chiller time of day scheduling communication for easier control of small jobs. Easily integrated with existing BAS via BACnet or LonTalk communication interface. All major service components are close to the unit edge for safe and easy maintenance. The chiller is designed for easy serviceability with input from our extensive experience indesign, testing and field operation.CopyrightThis document and the information in it are the property ofTrane, and may not be used orreproduced in whole or in part without written permission.Trane reserves the right to revise thispublication at any time, and to make changes to its content without obligation to notify any personof such revision or change.TrademarksAll trademarks referenced in this document are the trademarks of their respective owners.Revision History 2017 Ingersoll Rand Updated flow rates in General Data table. Correction to Table 15, p. 41 for 100 ton unit dimensions. Update AHRI back cover logo.CG-PRC017N-EN

Table of ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Model Number Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60CG-PRC017N-EN3

Features and BenefitsReliability Years of laboratory testing, including running the chiller at extreme operating conditions, haveresulted in optimized compressor and chiller systems reliability by confirming a robust designand verifying quality each step of the way. Direct-drive, low-speed scroll compressors with fewer moving parts provide maximumefficiency, high reliability, and low maintenance requirements. Suction gas-cooled motor staysat a uniformly low temperature for long motor life. The third generation microprocessor control system provides improved control capabilitieswith Adaptive Control to keep the unit operating even in adverse conditions. Advancedmicroelectronics protect both the compressor and the motor from typical electrical faultconditions like thermal overload and phase rotation. Standard factory-installed water strainer helps prevent system debris from affecting unit flowor heat transfer. Flow switch is factory-installed at the optimum location in the piping for reduced chillerinstallation cost and superior flow sensing, reducing the potential for nuisance trips. Microchannel condenser uses all-aluminum coils with fully-brazed construction.This designreduces risk of leaks.Their flat streamlined tubes with small ports and metallurgical tube-tofin bond enable exceptional heat transfer and dramatic reduction in refrigerant use. The optional round tube and plate fin condenser with its exceptionally rigid coil structure ismanufactured with hairpin tubes which reduces the number of braze joints by half, significantlyreducing the potential for leaks. Innovative condenser pressure integrated fan control algorithms and variable frequency driveon circuits’ lead fans provides more reliable operation at extreme temperature conditions.Life Cycle Cost-Effectiveness Industry leading full- and part-load efficiencies Electronic expansion valve and high speed suction temperature sensor enables tight chilledwater temperature control and low superheat, resulting in more efficient full-load and part-loadoperation than previously available. Partial heat recovery available to save energy on pre-heat or reheat applications. Optional pump package features variable speed drive on the pump motors, eliminating theneed for energy sapping chilled water system triple-duty or balancing valves. Additionally,system commissioning and flexibility is greatly enhanced. Chilled water supply reliability isincreased with the dual pump design, due to standard failure/recovery functionality.Application Versatility4 Industrial/low temperature process cooling - Excellent operating temperature range andprecise control capabilities enable tight control. Ice/thermal storage - Utilities and owners benefit from reduced cooling energy cost.Thechiller’s dual setpoint control and industry leading energy storage efficiency assures reliableoperation and superior system efficiency.Trane’s partnership with CALMAC brings a proventrack record of successful installations across many markets; from churches and schools to skyscrapers and office buildings. Partial heat recovery - An optional factory-installed heat exchanger provides hot water for manyneeds; water preheat and reheat for enhanced system humidity control are just two.This optionreduces operating costs associated with boilers/domestic hot water.CG-PRC017N-EN

Features and BenefitsSimple, Economical Installation Reduced sound levels, compared to other scroll compressor chillers, perfect for applyingoutdoor HVAC equipment in neighborhoods, such as K-12 schools. System integration available with LonTalk or BACnet through a single twisted-pair wire fora less expensive translation to an existing building automation system. Powder-coated paint provides superior durability, corrosion protection, and is less likely to bedamaged while rigging/lifting/installing the chiller. Factory commissioned unit-mounted starter reduces overall job cost and improves systemreliability by eliminating job site design, installation and labor coordination requirements.Precision Control Easily integrated with existing BAS via BACnet or LonTalk communication interfaces. Microprocessor-basedTracer CH530 controls monitor and maintain optimal operation of thechiller and its associated sensors, actuators, relays, and switches, all of which are factoryinstalled and tested prior to shipping. Adaptive Control maintains chiller operation under adverse conditions, when many otherchillers might simply shut down.The chiller control is able to compensate for conditions suchas high condensing pressure and low suction pressure. Advanced microprocessor controls enable variable primary flow applications providing chilledwater temperature control accuracy of 2 F (1.1 C) with flow changes up to 10 percent perminute, while keeping the chiller online through flow changes up to 30 percent per minute. Easy-to-use operator interface displays all operating and safety messages, with completediagnostics information, on a highly readable panel with a scrolling touch-screen display.Status and diagnostic messages are in plain language - no codes to interpret - and are availablein 20 languages.Improved ServiceabilityCG-PRC017N-EN All major serviceable components are close to the edge. Service shutoff valves and waterstrainer are conveniently located to enable easy service. Water piping connections are factory piped to the edge of the unit to make installation safer andfaster. Electronic expansion valve designed so controls can be removed and serviced withoutrefrigerant handling. The optional pump package is designed to be serviced in place.The unit structure includes arigging point for pump servicing, making inspection, cleaning and pump seal changes easier. High pressure transducer and temperature sensors mountings enable troubleshooting andreplacement without removing refrigerant charge, greatly improving serviceability over the lifeof the unit. Dead front panel construction provides for enhanced service technician safety.5

Application ConsiderationsCertain application constraints should be considered when sizing, selecting and installingTraneCGAM chillers. Unit and system reliability is often dependent upon proper and completecompliance with these considerations.Where the application varies from the guidelines presented,it should be reviewed with your localTrane account manager.Note: The terms water and solution are used interchangeably in the following paragraphs.Unit SizingSeeTOPSS performance selection software for unit capacities. Intentionally over-sizing a unit toassure adequate capacity is not recommended. Erratic system operation and excessivecompressor cycling are often a direct result of an oversized chiller. In addition, an oversized unitis usually more expensive to purchase, install, and operate. If oversizing is desired consider usingtwo smaller units.Water TreatmentThe use of untreated or improperly treated water in chillers may result in scaling, erosion,corrosion, and algae or slime buildup.This will adversely affect heat transfer between the waterand system components. Proper water treatment must be determined locally and depends on thetype of system and local water characteristics.Neither salt nor brackish water is recommend for use inTrane air-cooled CGAM chillers. Use ofeither will lead to a shortened life.Trane encourages employing a qualified water treatmentspecialist, familiar with local water conditions, to assist in establishing a proper water treatmentprogram.Foreign matter in the chilled water system can also increase pressure drop and, consequently,reduce water flow. For this reason it is important to thoroughly flush all water piping to the unitbefore making the final piping connections to the unit.Effect of Altitude on CapacityAt elevations substantially above sea level, the decreased air density will decrease condensercapacity and, therefore, unit capacity and efficiency. SAmbient LimitationsTrane chillers are designed for year-round operation over a range of ambient temperatures.The aircooled model CGAM chiller will operate in ambient temperatures of 32 to 125 F (0 to 52 C) for highambient or 0 to 125 F (-18 to 52 C) for wide ambient. Extreme low ambient operation is offereddown to -20 F (-28.9 C). Operation below 32 F requires the use of variable speed fans unlessotherwise specified.The minimum ambient temperatures are based on still conditions (winds not exceeding five mph).Greater wind velocities will result in a drop in head pressure, therefore increasing the minimumstarting and operating ambient temperature.The Adaptive Control microprocessor will attemptto keep the chiller on-line when high or low ambient conditions exist, making every effort to avoidnuisance trip-outs and provide the maximum allowable tonnage.6CG-PRC017N-EN

Application ConsiderationsWater Flow LimitsThe minimum water flow rates are given in the General Data section of this catalog. Evaporatorflow rates below the tabulated values will result in laminar flow causing freeze-up problems,scaling, stratification and poor control.The maximum evaporator water flow rate is also given.Flow rates exceeding those listed may result in very high pressure drop across the evaporator.Flow Rates Out of RangeMany process cooling jobs require flow rates outside of the published minimum and maximumflow rates for the CGAM evaporator. A simple piping change can alleviate this problem. Forexample: a plastic injection molding process requires 80 gpm (5.0 l/s) of 50 F (10 C) water andreturns that water at 60 F (15.6 C).The selected chiller can operate at these temperatures, but hasa minimum flow rate of 106 gpm (6.6 l/s).The system layout in Figure 1 can satisfy the process.Figure 1. Flow rate out of range systems solution50 F (10 C)80 gpm (5 l/s)50 F (10 C)112 gpm (7 l/s)50 F (10 C)32 gpm (2 l/s)57 F (14 C)112 gpm (7 l/s)60 F (15.6 C)80 gpm (5 l/s)Flow ProvingTrane provides a factory-installed water flow switch monitored by CH530 which protects the chillerfrom operating in loss of flow conditions.Variable Flow in the EvaporatorVariable Primary Flow (VPF) systems present building owners with several cost-saving benefitswhen compared with Primary/Secondary chilled water systems.The most obvious cost savingsresults from eliminating the constant volume chiller pump(s), which in turn eliminates the relatedexpenses of the associated piping connections (material, labor), and electrical service and switchgear. In addition to the installed cost advantage, building owners often cite pump related energysavings as the reasons that prompted them to select a VPF system.The CGAM is capable of handling variable evaporator flow without losing control of the leavingwater temperature.The microprocessor and capacity control algorithms are designed to handle a10 percent change in water flow rate per minute while maintaining a 2 F (1.1 C) leaving watertemperature control accuracy.The chiller tolerates up to 30 percent per minute water flow variationas long as the flow is equal or above the minimum flow rate requirement.With the help of a software analysis tool such as System Analyzer , DOE-2 orTRACE , you candetermine whether the anticipated energy savings justify the use of variable primary flow in aparticular application. Existing constant flow chilled water systems may be relatively easilyconverted to VPF and benefit greatly from the inherent efficiency advantages.CG-PRC017N-EN7

Application ConsiderationsWater TemperatureLeaving Water Temperature LimitsTrane CGAM chillers have three distinct leaving water temperature categories: standard, with a leaving solution range of 42 to 65 F (5.5 to 18 C) low temperature process cooling, with leaving solution range of 10 to 65 F (-12 to 18 C) ice-making, with leaving solution range of 20 to 65 F (-7 to 18 C) low leaving temperature, with leaving solution below 10 F (-12.2 C)Since a leaving solution temperature below 42 F (5.5 C) results in a suction temperature at orbelow the freezing point of water, a glycol solution is required for all low temperature and icemaking machines. Ice making control includes dual setpoint controls and safeties for ice makingand standard cooling capabilities. Consult your localTrane account manager for applications orselections involving low temperature or ice making machines.The maximum water temperature that can be circulated through the CGAM evaporator when theunit is not operating is 125 F (51.7 C). Evaporator damage may result above this temperature.Leaving Water Temperature Out of RangeSimilar to the flow rate limitations above, many process cooling jobs require temperature rangesthat are outside the allowable minimum and maximum operating values for the chiller. Figure 2below shows a simple example of a mixed water piping arrangement change that can enablereliable chiller operation while meeting such cooling conditions. For example, a laboratory loadrequires 238 gpm (5 l/s) of water entering the process at 86 F (30 C) and returning at 95 F (35 C).The chiller’s maximum leaving chilled water temperature of 65 F (15.6 C) prevents direct supply tothe load. In the example shown, both the chiller and process flow rates are equal, however, this isnot necessary. For example, if the chiller had a higher flow rate, there would simply be more waterbypassing and mixing with warm water returning to the chiller.Figure 2. Temperature out of range system solution59 F (15 C)60 gpm (3.8 l/s)86 F (30 C)238 gpm(15 l/s)59 F (15 C)238 gpm (15 l/s)P59 F(15 C)68 F (20 C)238 gpm (15 l/s)178 gpm(11.2 l/s)95 F(35 C)L178 gpm(11.2 l/s)P95 F (35 C)60 gpm (3.8 l/s)95 F (35 C)238 gpm (15 l/s)Supply Water Temperature DropThe cataloged performance data for theTrane CGAM chiller is based on a chilled water temperaturedrop of 10 F (6 C) for I-P data and 9 F (5 C) for SI data. Full load chilled water temperature dropsfrom 6 to 18 F (3.3 to 10 C) may be used as long as minimum and maximum water temperatureand minimum and maximum flow rates are not exceeded.Temperature drops outside this range8CG-PRC017N-EN

Application Considerationsat full load conditions are beyond the optimum range for control and may adversely affect themicrocomputer’s ability to maintain an acceptable supply water temperature range. Furthermore,full load temperature drops of less than 6 F (3.3 C) may result in inadequate refrigerant superheatwhich is critical to long term efficient and reliable operation. Sufficient superheat is always aprimary concern in any refrigerant system and is especially important in a packaged chiller wherethe evaporator is closely coupled to the compressor.Typical Water PipingAll building water piping must be flushed prior to making final connections to the chiller.To reduceheat loss and prevent condensation, insulation should be applied. Expansion tanks are also usuallyrequired so that chilled water volume changes can be accommodated.Avoidance of Short Water LoopsAdequate water volume is an important system design parameter because it provides for stablechilled water temperature control and helps limit unacceptable short cycling of chillercompressors.The chiller’s temperature control sensor is located in the supply (outlet) water connection or pipe.This location allows the building to act as a buffer to slow the rate of change of the system watertemperature. If there is not sufficient water volume in the system to provide an adequate buffer,temperature control can suffer, resulting in erratic system operation and excessive compressorcycling.Typically, a two-minute water loop circulation time is sufficient to prevent short water loop issues.Therefore, as a guideline, ensure the volume of water in the chilled water loop is greater than orequal to two times the evaporator flow rate. For systems with a rapidly changing load profile thevolume should be increased.If the installed system volume does not meet the above recommendations, the following itemsshould be given careful consideration to increase the volume of water in the system and, therefore,reduce the rate of change of the return water temperature. A volume buffer tank located in the return water piping. Larger system supply and return header piping (which also reduces system pressure drop andpump energy use).Minimum water volume for a process applicationIf a chiller is attached to an on/off