Packaged Gas/Electric Rooftop Units - Trane

1 Packaged Gas/ElectricRooftop UnitsPrecedent YSC060-12050 HzRT-PRC017-ENFebruary 2004 2004 American Standard Inc. All rights reservedRT-PRC017-ENIntroductionPreceden t .. The same with added is a flexible line of packagedunits that covers a wide variety microprocessor controlsprovide superior flexibility for thesimplest to the most sophisticatedapplications. In addition to controls,Precedent offers many other outstandingfeatures and option its sleek compact cabinet, roundedcorners and beveled top, it may just bethe most aesthetically pleasingpackaged unit on the planet. And, ofcourse, Precedent carries the Tranereputation for excellence, quality, andreliability.

2 It s hard to stop a simple applications, to the mostcomplex, Precedent has the and BenefitsApplication ConsiderationsSelection ProcedureModel Number DescriptionGeneral DataPerformance DataZone ControlsElectrical DataJobsite ConnectionDimensional DataWeightsMechanical Specifications3 ContentsRT-PRC017-EN24910121314424344455 354RT-PRC017-EN4 Features andBenefitsUnit CabinetThe compact cabinet with roundedcorners takes up less room and is lesscostly to ship. 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.

3 Our compressor lineincludes Trane built Climatuff reciprocating and Access PanelsEasy access panels reduce the number ofpossible water entry Ambient CoolingAll Precedent Units have coolingcapabilities down to -18 C (0 F) BaseFor added water integrity, Precedent hasa raised 29 mm (11/8") lip around theunit s downflow supply and return toprevent water from blowing into 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.

4 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 can be quickly adjustedwithout moving the mounted fan result is a major savings in time Condenser CoilPrecedent boasts a patented 1+1+1 Hybrid coil.

5 Permanently gapped foreasy 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 TerminalBoardPrecedent s Low Voltage Terminal Boardis external to the electrical controlcabinet. It is extremely easy to testoperation of all unit functions. This isanother cost and time saving Voltage ConnectionsThe wiring of the low voltageconnections to the unit and the zonesensors is as simple as 1-1, 2-2, and simplified system makes it easy forthe installer to ServiceSingle-side service is standard on allPrecedent Tubular Heat ExchangerThe compact cabinet features a tubularheat exchanger in low, medium and highheat heat exchanger is fabricated usingstainless steel burners and corrosion-resistant aluminized steel tubes asstandard on all models.

6 It has an induceddraft blower to pull the gas mixturethrough the burner tubes. The heaterhas a direct spark ignition system whichdoubles as a safety device to prove Applications Only two roof curbs for the 5-10 tonPrecedent line..simplifies curbselection. ReliaTel microprocessor controls tomeet either the simple or the morecomplex application. Low or high gas heat capacities. Airflow is outstanding. The Precedentcan replace an older machine with oldductwork and, in many cases, improvecomfort through better air distribution. Belt drive standard or oversizedsupply fan motors meet a wide airflowrange. Precedent offers ultimate and components are not pre- Packaged at the factory.

7 Units are builtto order in our standard shortest inthe industry ship cycle andBenefitsMicro 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 utilizinginput from sensors that measureoutdoor and indoor temperature. Improves quality and reliabilitythrough the use of time-testedmicroprocessor controls and logic. Prevents the unit from short cycling,considerably improving compressorlife.

8 Ensures that the compressor will runfor a specific amount of time, whichallows oil to return for betterlubrication, enhancing the reliability ofthe compressor. 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 pacesduring testing. Simply place a jumperbetween Test 1 and Test 2 terminals onthe Low Voltage Terminal Board andthe unit will walk through itsoperational steps.

9 The unitautomatically 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. Features expanded diagnosticcapabilities when used with Trane sIntegrated Comfort 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.

10 Intelligent Anticipation is a standardfeature of the Micro. Functioningconstantly, the Micro and zone sensorswork together in harmony, to providetight comfort andBenefitsFactory-installed OptionsHinged Access DoorsThese doors permit easy access to thefilter, fan/heat, and compressor/controlsections. They reduce the potential roofdamage from screws or sharp accessdoor with either dry bulb, referenceor comparative enthalpy sensing, thisfeature provides free cooling as theoutdoor temperature and/or humiditydecreases. Economizers, correctlyinstalled, offer valuable energy economizers save timeand ensure proper 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 Filter/Fan Fail SwitchesThese sensors allow a zone sensorservice light or Integrated ComfortSystem to indicate a dirty filter or a fanthat s not working.