May 1998 Packaged RT-DS-9 27 Voyager …

1 271/2 to 50 Ton - 60 HzVoyager Commercial RT-DS-9 May 1998 First Printing July 1998 PackagedRooftopAir ConditionersRT-DS-92 Features andBenefits American Standard Inc. 1998SM Voyager Commercial s features andbenefits are comprised of cutting edgetechnologies like the reliable 3-D Scrollcompressor, Trane engineeredmicroprocessor controls, computer-aided run testing, and IntegratedComfort Systems. So, whether you rethe contractor, the engineer, or theowner you can be certain that whenyou ve chosen Voyager Commercial,you ve the best value!Over the years the Voyager productline has developed into the mostcomplete line of commercial packagedunits available. We were first with theMicro when we developedmicroelectronic unit controls and wemove ahead again with VoyagerCommercial Voyager Commercial line ofpackage units begins with 271/2 andincludes 30, 35, 40, and 50 ton new sizes meet the needs of thechanging commercial customers demand units that willhave exceptional reliability, meetstringent performance requirements,and be competitively priced.

2 Thesesame requirements drove the design ofthe original light commercial Voyagerand have been carried forward intoVoyager andBenefitsContentsOptional Features Electric heat Natural gas heat LP gas heat (kit only) Power Exhaust Barometric Relief High Efficiency 2 Throwaway Filters High Efficiency 4 Throwaway Filters High Efficiency supply fan motors Manual fresh air damper Economizer with dry bulb control Economizer with reference enthalpycontrol Economizer with differential(comparative) enthalpy control Inlet guide vanes on VAV units Variable frequency drives on VAV units(with or without bypass) Service Valves Through-the-base electrical provision Factory mounted disconnect withexternal handle (non-fused) Factory powered 15A GFI convenienceoutlet Field powered 15A GFI convenienceoutlet Integrated Comfort System ControlOption Ventilation Override Hinged Service Access Factory installed Condenser CoilGuardsStandard Features Factory installed and commissionedmicroelectronic controls Trane 3-D Scroll Compressors Dedicated downflow or horizontalconfiguration CV or VAV control FROSTAT coil frost protection on allunits Supply air overpressurization protectionon VAV units Supply airflow proving Emergency stop input Compressor lead-lag Occupied-Unoccupied switching Timed override activation FC supply fans UL and CSA listing on standard options Two inch standard efficiency filters Finish exceeds salt spray requirementsof ASTM B117 Sloped condensate drain pansFeatures and Benefits2 Model Number Description9 General Data10 Application Considerations13 Selection Procedure15 Performance Adjustment Factors17 Performance Data18 Electrical

3 Data26 Controls28 Dimensional Data31 Weights34 Field Installed Sensors35 Mechanical Specifications384 Features andBenefitsOne of two matched scroll plates thedistinguishing feature of the illustrates low torque variation of3-D Scroll compressors reciprocatingcompressor. Trane 3-D Scroll CompressorSimple Design with 70% Fewer PartsFewer parts than an equal capacityreciprocating compressor meanssignificant reliability and efficiencybenefits. The single orbiting scrolleliminates the need for pistons,connecting rods, wrist pins and parts lead to increased moving parts, less rotating massand less internal friction means greaterefficiency than Trane 3-D Scroll provides importantreliability and efficiency benefits. The 3-DScroll allows the orbiting scrolls to touchin all three dimensions, forming acompletely enclosed compressionchamber which leads to increasedefficiency. In addition, the orbiting scrollsonly touch with enough force to create aseal; there is no wear between the scrollplates.

4 The fixed and orbiting scrolls aremade of high strength cast iron whichresults in less thermal distortion, lessleakage, and higher efficiencies. Themost outstanding feature of the 3-DScroll compressor is that slugging willnot cause failure. In a reciprocatingcompressor, however, the liquid or dirtcan cause serious Torque VariationThe 3-D Scroll compressor has a verysmooth compression cycle with torquevariations that are only 30 percent ofthat produced by a reciprocatingcompressor. This means the scrollcompressor imposes very little stress onthe motor for greater reliability. Lowtorque variation means reduced noiseand Gas Cooled MotorCompressor motor efficiency andreliability is further optimized with thisdesign. Cool suction gas keeps themotor cooler for longer life and Design Through Testing andResearchWith over twenty years of developmentand testing, Trane 3-D Scrollcompressors have undergone morethan 400,000 hours of laboratory testingand field operation.

5 This work combinedwith over 25 patents makes Trane theworldwide leader in air conditioningscroll compressor andBenefitsMicro Controls For over 10 years Trane has beenworking with micro-processor controls inthe applied equipment markets. Thesedesigns have provided the technologythat has been applied to the Voyagerunits. The Micro provides unit control forheating, cooling and ventilating utilizinginput from sensors that measureoutdoor and indoor temperature. The Micro improves quality andreliability through the use of time-testedmicro-processor controls and Micro: prevents the unit from short cycling,considerably improvingcompressor life. ensures that the compressor will runfor a specific amount of time whichallows oil to return for betterlubrication, enhancing the reliability ofthe commercial compressor. The Voyager with the Micro reduces thenumber of components required tooperate the unit, thereby reducingpossibilities for component failure.

6 The negative pressure gas valve will notallow gas flow unless the combustionblower is operating. This is one of ourunique safety features. The forced combustion blower suppliespre-mixed fuel through a singlestainless steel burner screen into asealed drum where ignition takes is more reliable to operate andmaintain than a multiple burner system. The hot surface ignitor is a gas ignitiondevice which doubles as a safety deviceutilizing a continuous test to prove theflame. The design is cycle tested at thefactory for quality and reliability. All the gas/electric rooftops exceed allCalifornia seasonal efficiencyrequirements. They also perform betterthan required to meet the CaliforniaNOx emission and Tube Heat Exchanger The drum and tube heat exchanger isdesigned for increased efficiency andreliability and has utilized improvedtechnology incorporated in the largeroof top commercial units for almost20 heat exchanger is manufacturedusing aluminized steel with stainlesssteel components for maximumdurability.

7 The requirement for cycletesting of heat exchangers is 10,000cycles by ANSI This is thestandard required by both UL and AGAfor cycle test requirements. Tranerequires the design to be tested to 21/2times this current standard. The drumand tube design has been tested andpassed over 150,000 cycles which isover 15 times the current ANSI and Tube Heat Exchanger Quality and ReliabilityForced Combustion BlowerNegative Pressure Gas ValveHot Surface Ignitor6 Features andBenefitsEase of InstallationContractors look for lower installation(jobsite) costs. Voyager sconversionless units provide many timeand money saving Units The dedicated design units (eitherdownflow or horizontal) require nopanel removal or alteration time toconvert in the field a major costsavings during Airflow U-shaped airflow allows for improvedstatic capabilities. The need for highstatic motor conversion is minimizedand time isn t spent changing to highstatic oversized Point PowerA single electrical connection powersthe The function of the Micro replaces theneed for field installed anti-shortcycletimer and time delay relays.

8 The Microensures that these controls are integralto the unit. The contractor no longer hasto purchase these controls as optionsand pay to install them. The wiring of the low voltageconnections to the unit and the zonesensors is as easy as 1-1, 2-2, and simplified system makes it easierfor the installer to Fans with Inlet Guide Vanes Trane s forward-curved fans with inletguide vanes pre-rotate the air in thedirection of the fan wheel, decreasingstatic pressure and horsepower,essentially unloading the fan wheel. Theunloading characteristics of a Trane FCfan with inlet guide vanes result insuperior part load Testing All of Voyager s designs were rigorouslyrain tested at the factory to ensurewater integrity. Actual shipping tests are performed todetermine packaging are test shipped around thecountry. Factory shake and drop testedas part of the package design processto help assure that the unit will arrive atyour job site in top condition.

9 Rigging tests include lifting a unit intothe air and letting it drop one foot,assuring that the lifting lugs and railshold up under stress. 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. Sub-standard parts areidentified and rejected immediately. Every unit receives a 100% unit run testbefore leaving the production line tomake sure it lives up to rigorous Part-Load Efficiency The Scroll compressor s unique designallows it to be applied in a passiveparallel manifolded piping scheme,something that a recip just doesn t dovery the unit begins stage back at partload it still has the full area and circuitryof its evaporator and condenser coilsavailable to transfer heat. In simpleterms this means superior part-loadefficiencies (IPLV) and lower unitoperating andBenefitsValueLow Ambient CoolingAll Voyager Commercial units havecooling capabilities down to 0 F Exhaust OptionProvides exhaust of the return air whenusing an economizer to maintain properbuilding pressurization.

10 Great forrelieving most buildingoverpressurization Benefits The Micro in the Voyager units has built-in anti-short-cycle timer, time delay relayand minimum on time controls. Thesecontrols are functions of the Micro andare factory tested to assure properoperation. The Micro softens electrical spikes bystaging on fans, compressors andheaters. Intelligent Fallback is a benefit to thebuilding occupant. If a component goesastray, the unit will continue to operateat predetermined temperature setpoint. Intelligent Anticipation is a standardfeature of the Micro. It functionsconstantly as the Micro and zonesensor work together in harmony toprovide tighter comfort control thanconventional s owners are more conscious ofthe cost of service and was designed with input fromservice contractors. Their informationhelped us design a unit that would getthe serviceman off the job quicker andsave the owner money. Here is whyVoyager can save money in s Simpler DesignThe Voyager design uses fewer partsthan previous units.