Packaged Cooling with Electric Heat Rooftop Units

1 Packaged Cooling withElectric heat Rooftop UnitsPrecedent 3 - 10 Tons 60 HzRT-PRC005-ENMarch 2003RT-PRC005-EN 2003 American Standard Inc. All rights reservedIntroductionPrecedentTM .. The same with added is a flexible line of packagedunits that covers a wide variety controls are availablefor simpler applications, and for themore sophisticated, ReliaTel microprocessor controls. In addition tocontrols, Precedent offers many otheroutstanding features and option its sleek compact cabinet, roundedcorners and beveled top, it may just bethe most aesthetically pleasing packagedunit on the planet. And, of course,Precedent carries the Trane reputation forexcellence, quality and simple applications, to the mostcomplex, Precedent has the and BenefitsApplication ConsiderationsSelection ProcedureModel Number DescriptionGeneral DataPerformance DataCooling PerformanceFan PerformanceHeat PerformanceControlsElectric PowerDimension and WeightsMechanical Specifications248910111515264749506473 Contents4RT-PRC005-ENFeatures andBenefitsUnit CabinetThe compact cabinet with roundedcorners takes up less room and is lesscostly to ship.

2 The beveled and ribbedtop is not only aesthetically pleasing, it isdesigned to prevent water from Point PowerA single electrical connection powers contains the bestcompressor technology available toachieve the highest possibleperformance. Our compressor lineincludes Trane built reciprocating Access PanelsEasy access panels reduce the number ofpossible water entry Ambient CoolingAll Precedent microprocessor Units havecooling capabilities down to 0 F asstandard. Electromechanical modelshave Cooling capabilities to 40 F as built,or to 0 F by adding the optional lowambient control (frostat).Unit BaseFor added water integrity, Precedent hasa raised 11/8" lip around the unit sdownflow supply and return to preventwater from blowing into the Drain PansEvery Precedent unit has a non-corrosive, removable, double-slopeddrain pan that s easy to clean andreversible to allow installation of draintrap on either side of the the Base CondensateEvery unit includes provisions forthrough the base condensate drainconnections.

3 This allows the drain to beconnected through the roof curb insteadof a roof InsulationAll panels in the Evaporator section ofthe unit have cleanable foil-facedinsulation. All edges are either capturedor sealed to ensure no fibers get into Units The Units ship in a downflowconfiguration. They can be easilyconverted to horizontal by simplymoving two panels. Units come complete with horizontalduct flanges so the contractor doesn thave to field fabricate them. Theseduct flanges are a time and cost Access PanelsRemove two screws for access to thestandardized internal components Idler ArmWith the Easy-Adjust Idler Arm, the beltand sheaves on belt drive Units can bequickly adjusted without moving themounted fan motor. The result is a majorsavings in time and Condenser CoilPrecedent boasts a patented 1+1+1 Hybrid coil, permanently gapped foreasy of And Numbered WiringYou save time and money tracing wiresand diagnosing the andBenefitsStandardized Components Components are placed in the samelocation on all Precedent yourself with one Precedentand you are familiar with Access Low Voltage Terminal BoardPrecedent s Low Voltage Terminal Boardis external to the electrical controlcabinet.

4 It is extremely easy to locate andattach the thermostat wire. This isanother cost and time saving Voltage ConnectionsThe wiring of the low voltage connectionsto the unit and the zone sensors is assimple as 1-1, 2-2, and 3-3. This simplifiedsystem makes it easy for the installer towireSingle-Side ServiceSingle-side service is standard on allPrecedent Applications Only two roof curbs for the 3-10 tonPrecedent line..simplifies curbselection. Standard or High Efficiency Cooling Electromechanical or ReliaTelmicroprocessor controls to meet eitherthe simple or the more complexapplication. Airflow is outstanding. The Precedentcan replace an older machine with oldductwork and, in many cases, improvecomfort through better air distribution. Belt or direct drive standard oroversized supply fan motors meet awide airflow range.

5 Precedent offers ultimate and components are not pre- Packaged at the factory. Units are builtto order in our standard shortest in theindustry ship cycle ControlsSeveral years ago, Trane was the first tointroduce microprocessor controls intothe Light Commercial Market. Thatdesign, along with immeasurableexperience, has provided the technologyfor Trane s second-generation ReliaTel microprocessor Micro: Provides unit control for heating, Cooling , and ventilating by utilizing inputfrom sensors that measure outdoorand indoor temperature. Improves quality and reliability throughthe use of time-tested microprocessorcontrols and logic. Prevents the unit from short cycling,considerably improving compressorlife. Ensures that the compressor will run fora specific amount of time, which allowsoil to return for better lubrication,enhancing the reliability of thecompressor.

6 Reduces the number of componentsrequired to operate the unit, therebyreducing possibilities for componentfailure. Eliminates the need for field-installedcomponents with its built-in anti-short-cycle timer, time delay relay andminimum on time controls. Thesecontrols are factory tested to assureproper operation. Requires no special tools to run thePrecedent unit through its paces duringtesting. Simply place a jumper betweenTest 1 and Test 2 terminals on the LowVoltage Terminal Board and the unit willwalk through its operational steps. Theunit automatically returns control to thezone sensor after stepping through thetest mode a single time, even if thejumper is left on the unit. As long as the unit has power and theLED is lit, the Micro is operational. Thelight indicates that the Micro isfunctioning properly.

7 Features expanded diagnosticcapabilities when used with Trane sIntegrated Comfort TM Systems. As an energy benefit, softens electrical spikes by staging on fans,compressors and heaters. The Intelligent Fallback or AdaptiveControl is a benefit to the buildingoccupant. If a component goes astray,the unit will continue to operate atpredetermined temperature set points. Intelligent Anticipation is a standardfeature of the Micro. Functioningconstantly, the Micro and zone sensorswork together in harmony, to providetight comfort Controls For the simpler job that does notrequire a building automation system,or expanded diagnostics capabilities,Precedent offers electromechnicalcontrols. This 24-volt control includesthe control transformer, contactorpressure lugs for power andBenefitsFactory-installed OptionsEconomizerEquipped with either dry bulb, referenceor comparative enthalpy sensing, thisfeature provides free Cooling as theoutdoor temperature and/or humiditydecreases.

8 Economizers, correctlyinstalled, offer a valuable energysavings. Factory-installed economizerssave time and ensure proper Communication InterfaceAvailable factory or field-installed. Thismodule when applied with ReliaTel easily interfaces with Trane s IntegratedComfortTM Access DoorsThese doors permit easy access to thefilter, fan/ heat , and compressor/controlsections. They reduce the potential roofdamage from screws or sharp accessdoor the Base Electrical UtilityAccessFactory provided through the baseopenings simplify wiring and these utility openingsfrequently minimize the number of roofpenetrations, the integrity of roofingmaterials is Mounted Disconnect or CircuitBreakerCodes require a method of assured unitshutdown for servicing. Field-installeddisconnects sometimes interfere withservice access.

9 Factory installation of unitdisconnects reduces costs, assuresproper mounting and provides theopportunity to upgrade to unit circuitbreaker Filter/Fan Fail SwitchesThese sensors allow a zone sensorservice light or Integrated ComfortSystem to indicate a dirty filter or a fanthat s not working. The field installationcharges for these valuable feedbackdevices often eliminate them fromconsideration. Factory installation canmake such features a good (Hot Gas Reheat)OptionThis option allows for increased outdoorair ventilation. 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 following options round-out thecomplete line of Precedent options: 0 - 50% Manual or MotorizedOutside Air Hail Protection Quality Coil Guards Electric Heaters Supply and/or Return SmokeDetectors High Pressure Cutout(standard on 3-phase models withscroll compressors and all standardefficiency 3-ton models) Thermal Expansion Valve for a widerrange of applications Discharge Air Sensor Wide array of Zone Sensors andThermostats Factory built Roof Curb Power Exhaust LonTalk Communications InterfaceOne of Our Finest Assets:Trane Sales Representatives are aSupport group that can assist you with .

10 Product Application Service Training Special Applications Specifications Computer Programs and much morePrecedent has the features and benefitsthat make it first class in the lightcommercial Rooftop market. Designedwith input from field contractors andengineers, its airflow performance same added DisconnectConvenience Outlet7RT-PRC005-ENFeatures andBenefitsVariTrac Va ri Tra cWhen Trane s changeover VAV Systemfor light commercial applications iscoupled with Precedent, it provides thelatest in technological advances forcomfort management systems and canallow thermostat control in every zoneserved by VariTrac. We perform a 100% coil leak test at thefactory. The evaporator and condensercoils are leak tested at 200 psig andpressure tested to 450 psig. All parts are inspected at the point offinal assembly.