Packaged Gas/Electric Rooftop Units - Heating and …

1 Packaged Gas/ElectricRooftop UnitsPrecedent 3 - 10 Tons 60 HzRT-PRC006-ENOctober 2004 2004 American Standard Inc. All rights reservedRT-PRC006-ENIntroductionPackaged RooftopAir ConditionersThrough the years, Trane has designedand developed the most complete line ofPackaged Rooftop products available inthe market today. Trane was the first tointroduce the Micro microelectronicunit controls and has continued toimprove and revolutionalize this controls are availablefor simpler applications, and for themore sophisticated, ReliaTel microprocessor ReliaTel control platform offers thesame great features and functionality asthe original Micro, with additionalbenefits for greater application its sleek compact cabinet, roundedcorners and beveled top Precedentcontinues to provide the higheststandards in quality and reliability,comfort, ease of service, and theperformance of Trane light customers demand products thatprovide exceptional reliability, meetstringent performance requirements,and are competitively priced.

2 Tranedelivers with features cutting edgetechnologies: reliable compressors,Trane engineered ReliaTel controls,computer-aided run testing, andIntegrated Comfort Systems. So,whether you re the contractor, theengineer, or the owner you can becertain Precedent Products are built tomeet your s Hard To Stop A Trane. 3 ContentsRT-PRC006-ENIntroductionFeatures and BenefitsApplication ConsiderationsSelection ProcedureModel Number DescriptionGeneral DataPerformance DataCooling PerformanceFan PerformanceHeating PerformanceControlsElectric PowerDimension and WeightsMechanical Specifications24111214152837287577798695 RT-PRC006-EN4 Features andBenefitsFactory Installed Options Black Epoxy Pre-Coated Coils Dehumidification Option High Pressure Cutout Hinged Access Doors Novar Return Air Sensor Novar unit Controls Phase Monitor Powered or Unpowered ConvenienceOutlet Supply and/or Return Air Smoke Detector Thermal Expansion Valve Through the Base Electrical Access Through the Base Electrical With CircuitBreaker Through the Base Electrical WithDisconnect Switch Two-Inch Pleated FiltersFactory or Field Installed Options Clogged Filter/Fan Failure Switch Differential Pressure

3 Switches Discharge Air Sensing Kit Economizer electric Heaters Frostat LonTalk Communications Interface Oversized Motors Reference or Comparative Enthalpy Tool-less Hail Guards Trane Communications Interface (TCI)Field Installed Options CO2 Sensing Digital Display Zone Sensor Dual Thermistor Remote Zone Sensor High Static Drive Humidity Sensor Manual Outside Air Damper Motorized Outside Air Dampers Powered Exhaust Remote Potentiometer Roof Curb Thermostat Ventilation Override Accessory Zone Sensor5RT-PRC006-ENFeatures andBenefitsEasy to Install, Service andMaintainBecause today s owners are very cost-conscious when it comes to service andmaintenance, the Trane Precedent wasdesigned with direct input from servicecontractors. This valuable informationhelped to design a product that would getthe serviceman off the job quicker andsave the owner money. Precedent doesthis by offering:Quality and ReliabilityReliaTel Controls (LCI-R)ReliaTel controls provide unit control forheating, cooling and ventilating utilizinginput from sensors that measure outdoorand indoor and Reliability are enhancedthrough ReliaTel control and logic: prevents the unit from short cycling,considerably improvingcompressor life.

4 Ensures that the compressor will runfor a specific amount of time whichallows oil to return for betterlubrication, enhancing the reliability ofthe with ReliaTel reduces thenumber of components required tooperate the unit , thereby reducingpossibilities for component Makes Installing andServicing EasyReliaTel eliminates the need for fieldinstalled anti-shortcycle timer and timedelay relays. ReliaTel controls providethese functions as an integral part of theunit. The contractor no longer has topurchase these controls as options andpay to install wiring of the low voltage connectionsto the unit and the zone sensors is aseasy as 1-1, 2-2, and 3-3. This simplifiedsystem makes wiring easier for Makes Testing EasyReliaTel requires no special tools to runthe Precedent unit through its place a jumper between Test 1and Test 2 terminals on the Low VoltageTerminal Board and the unit will walkthrough its operational stepsautomatically.

5 The unit automatically returns control to the zone sensor after stepping through the test mode a single time, even if the jumper is left on the long as the unit has power and the system on LED is lit, ReliaTel isoperational. The light indicates that thecontrols are functioning features expanded diagnosticcapabilities when utilized with TraneIntegrated Comfort zone sensor options have centralcontrol panel lights which indicate themode the unit is in and possiblediagnostic information (dirty filters forexample).Other ReliaTel BenefitsThe ReliaTel built-in anti-shortcycle timer,time delay relay and minimum on timecontrol functions are factory tested toassure proper softens electrical spikes bystaging on fans, compressors Fallback is a benefit to thebuilding occupant. If a component goesastray, the unit will continue to operate atpredetermined temperature Anticipation is a standardReliaTel feature.

6 It functions continuouslyas ReliaTel and zone sensor(s) worktogether in harmony to provide muchtighter comfort control than conventionalelectro-mechanical same ReliaTel Board fits allPrecedent Packaged Gas/Electrics,Cooling with electric Heat, and HeatPump models. This providesstandardization of parts for money is tied up in inventory ControlsFor the simpler job that does not requirea building automation system, orexpanded diagnostics capabilities,Precedent offers electromechnicalcontrols. This 24-volt control includes thecontrol transformer and contactorpressure lugs for power RT-PRC006-EN6 Features andBenefitsBlack Epoxy Pre-Coated CoilsThe pre-coated coils are an economicaloption for protection in mildly IntegrityFor added water integrity, Precedent hasa raised 11/8" lip around the supply andreturn of the downflow Units to preventwater from blowing into the Filter/Fan Failure SwitchA dedicated differential pressure switch isavailable to achieve active fan failureindication and/or clogged filter sensors allow a zone sensorservice light or Integrated ComfortSystem to indicate a dirty filter or a fanthat s not working.

7 The field installationcharges for these valuable feedbackdevices often eliminate them fromconsideration. Factory installation canmake such features a good SensingThe CO2 sensor has the ability to monitorspace occupancy levels within thebuilding by measuring the parts permillion of CO2 (Carbon Dioxide) in the the CO2 levels increase, the outside airdamper modulates to meet the CO2space ventilation requirements. The CO2sensor kit is available as a field And Numbered WiringSave time and money tracing wires anddiagnosing the Standard andOptional ComponentsCompressorsPrecedent contains the best compressortechnology available to achieve thehighest possible performance. Ourcompressor line includes Trane builtClimaTuff reciprocating and CoilPrecedent boasts a patent-pending1+1+1 condenser coil, permanentlygapped for easy (Hot Gas Reheat)OptionThis option allows for increased outdoorair ventilation.

8 It reduces humidity levelswhile increasing comfort level in the airspace. Cooling can operate without ademand for dehumidification. The hot gasreheat coil is designed to delivermaximum reheat temperatures andpivot to allow for easy access Display Zone SensorThe Digital LCD (Liquid Crystal Display)zone sensor has the look and functionalityof standard zone sensors. This sensorshould be utilized with ReliaTel Air Sensing KitProvides true discharge air sensing inheating models. The kit is functional onlywith the ReliaTel Options And Horizontal EconomizersThe economizers come with three controloptions dry bulb is standard, enthalpyand differential enthalpy are Thermistor Remote Zone SensorThis sensor will reduce the total numberof remote sensors to obtain spacetemperature averaging. This sensorshould be utilized with ReliaTel andBenefitsFoil-Faced InsulationAll panels in the evaporator section of theunit have cleanable foil-faced edges are either captured or sealed toensure no fibers get into the Built Roof CurbsAvailable for downflow Units .

9 Only tworoof curbs for the entire Precedent linesimplifies curb are built to order in our standard shortest in the industry ship cycle Air0 - 25% manual or 0 - 50% motorizedoutside air hoods are Pressure CutoutThis factory-installed option is offered forunits that do not have High PressureCutout as standard. All 3-phase Units withscroll compressors include High Pressurecutout as Static Drive AccessoryAvailable on many models, this highstatic drive accessory extends thecapability of the standard motor. Avoidexpensive motors and operating costs byinstalling this optimized Access DoorsThese doors permit easy access to thefilter, fan/heat,and compressor/control reduce thepotential roofdamage fromscrews or sharpaccess CommunicationsInterfaceThe LonTalkcommunicationsinterface allowsthe unit tocommunicate as a Tracer LCI-V deviceor directly with generic LonTalk NetworkBuilding Automation System MonitorPhase monitor shall provide 100%protection for motors and compressorsagainst problems caused by phase loss,phase imbalance, and phase monitor is equipped with an LEDthat provides an ON or FAULT Exhaust OptionThis option is available on downflow unitsand provides exhaust of the return air,when using a downflow economizer, tomaintain proper building for relieving most buildingoverpressurization Tubular Heat ExchangerThe compact cabinet features a tubularheat exchanger in low.

10 Medium and highheat heat exchanger is fabricated usingstainless steel burners and corrosion-resistant aluminized steel tubes asstandard on all models. It has an induceddraft blower to pull the gas mixturethrough the burner tubes. The heater hasa direct spark ignition system whichdoubles as a safety device to prove electric Precedent models exceed allCalifornia seasonal efficiencyrequirements. They also perform betterthan required to meet the California NOxemission PanelsRemove two screws for access to thestandardized internal components Idler ArmWith the Quick-Adjust Idler Arm, the beltand sheaves can be quickly adjustedwithout moving the mounted fan result is a major savings in time or Comparative EnthalpyMeasures and communicates humiditywhile maximizing comfort Drain PansEvery Precedent unit has a non-corrosive, removable,double-slopeddrain pan that seasy to clean andreversible to allo winstallation of draintrap on either sideof the are placedin the same location onall Precedent yourself with one Precedentand you are familiar with to standardized componentsthroughout the Precedent line,contractors/owners can stock and/or Return Air SmokeDetector With this option installed, if smoke isdetected, all unit operation will be shutdown.