Indoor Gas Heating Products - Trane

1 Indoor GasHeating ProductsUnit HeatersDuct FurnacesUH-PRC002-ENFebruary 2001 American Standard Inc. 2001UH-PRC002-ENIntroductionTrane unit heaters represent atechnological breakthrough in offers customers the mostcomplete line of unit heaters every unit in the line has been ratedfor 80 percent thermal efficiency higher thermal efficiency and loweroperating costs are just two features ofthis product line. Innovation theengineering advances you ve come toexpect from Trane can also be foundacross this entire line of unit rugged, quality constructionprovides years of dependable Products mean Trane does fair, competitive pricing. The 10-year warranty tells you Trane will be herefor the long haul keeping ourcommitment to you. You can count onTrane standing behind every unitshipped. That is what Trane value HighlightsFeatures and BenefitsApplication ConsiderationsSelection ProcedureManual Selection ProcedureModel Number DescriptionGeneral DataPerformance DataAdjustment FactorControlsElectric PowerDimension and WeightsMechanical Specifications245816161719212127294157UH -PRC002-EN4 FeaturesHighlightsTen-Year WarrantyThe complete heat exchanger, draft hoodassembly of the unit heater and burnersare warranted by Trane to be free fromdefects in material and workmanship fora period of 10 years from the date ofmanufacture.

2 (Warranty not applicableon duct furnaces or SeparatedCombustion units.)Quiet OperationTrane unit heaters incorporate anexceptionally balanced fan blade toassure quiet ExchangersAll Trane heat exchangers are available inthree types of steel: Aluminized Steel (Standard) 409 Grade Stainless Steel (Optional)(30-400 MBh units) 321 Grade Stainless Steel (Optional)(100-400 MBh units)24V SystemAll units are equipped with a 24 Vcontrolsystem which is powered by a 24 Vtransformer as standard Time DelayThe fan time delay is mounted at thefactory as standard equipment (optionalon duct furnaces). This feature eliminatesan initial blast of cold air by allowing theunit to fire for a short period of timebefore actuating the fan motor. After thethermostat is satisfied (with burners off),the fan continues to operate forapproximately one minute, removingresidual heat from heat sizes 30,000 through 400,000 Btuinput are equipped with a provendesign pressed steel burner having aunique burner shade protectivedevice to prevent scale or foreignmatter from plugging the burner Saving Intermittent Pilot ControlThe pilot burner is ignited only duringeach cycle of operation, therebyconserving energy during the off OperationAll units are available for operation oneither natural or LP gas from Access For MaintenanceAll Trane unit heaters are so designedthat the burner access panel is removedwith just two screws.

3 Burners areindividually removable for inspectionand servicing. Pilot is also accessiblethrough side panel access FiredAll Trane unit heaters are test fired toassure proper For RetrofitTrane unit heaters let you pocket fuelsavings from day one and provideyears of dependable andBenefitsHigh-Efficiency PropellerFan Unit HeatersTrane high-efficiency propeller fan unitheaters achieve annual fuel savings of20 to 25 percent over conventionalgravity vented unit features a factory-installedflue vent fan and sealed flue collectorthat controls combustion and excessair during the air no longer escapes throughthe draft diverter opening during theoff-cycle. Energy saving intermittentpilot ignition reduces gas losses. Thepilot only operates when power venting, smalleropenings and single-walled vent pipereduce heat loss. Higher efficienciescan reduce equipment and materialcosts as well as installation Efficiency Indoor Duct FurnaceThe high efficiency Indoor gas ductfurnace complements our currentcentrifugal and propeller fan high efficiency lines were designed toachieve fuel savings of up to25 percent over conventional gravityvented gravity vented heaters lostheated room air through the draftdiverter opening.

4 The high efficiency linefeatures an integral flue vent fan andsealed flue collector for improvedcombustion. It reduces air requirementsand wind effects on the system sefficiency. Intermittent pilot ignitionreduces pilot gas losses and the flue ventfan allows for horizontal venting throughside FURNACES ARE APPROVED FORBLOW-THRU APPLICATIONS CentrifugalFan Unit HeatersThe high-efficiency centrifugal fan unitheater keeps energy costs down. Thedesign advances achieve annual fuelsavings of 20 to 25 percent overconventional gravity vented the past, these conventional gravityvented heaters lost heated room airthrough the draft diverter high-efficiency centrifugal unitfeatures integral power venting (factory-installed) and sealed flue collector foroptimum reduces wind effects on the system sefficiency. Intermittent pilot ignitionreduces pilot gas losses and the powerdrafter allows for horizontal ventingthrough side walls. It all adds up tohigher efficiencies and lower andBenefitsSeparated Combustion Propeller FanUnit HeatersSeparated Combustion Centrifugal FanUnit HeatersThe Trane separated combustion unitsare designed for space Heating in mildlyhostile environments.

5 These units can beinstalled where dusty, dirty, or mildlycorrosive conditions exist or where highhumidity or slightly negative applications are industrial workareas with wood or textile dust, non-explosive contaminated environments,non-chlorine process areas, automotiveand truck garages and Fan Unit HeatersCentrifugal fan unit heaters are ideal forcommercial and industrial applicationswhere a low noise level is desired. Tranecentrifugal fan unit heaters whichoperate at .2-inches are fan gas-fired unit heatersshould be selected for applicationswhere ductwork or discharge nozzles areto be Fan Unit HeatersThe Trane gas-fired unit heater is acomplete heat generating anddistributing plant, equipped withautomatic safety controls, all packaged ina modern, streamlined, space saving,attractive casing for mounting near theceiling. Propeller units are basically zerostatic pressure appliances. At no timeshould ductwork be used with designs are certified by AGA andCGA as conforming with standards forsafe and efficient units achieve higher seasonalefficiencies by using outside air forcombustion, overcomes slight negativepressures near exhaust fans or paintbooths and isolates burner from dust,humidity and chemicals.

6 The combustionprocess is separate from theenvironment where the unit is power venting system draws acontrolled quantity of combustion air from outside the building. The samesystem exhausts flue Products to theoutside. The burners, pilot and fluesystem are enclosed within the unit, thusthe whole combustion process is literallyunaffected by the atmosphere where theheater is andBenefitsTubular Heat ExchangerPropeller Fan Unit HeatersThe Trane Company has added a newunit heater to enhance its broad line ofheating Products . The Trane tubular heatexchanger is a very durable unit heaterthat provides an alternative to thetraditional clam shell style. These arepropeller style units that combine thelatest tubular heat exchanger style withinshot burner technology to create a veryefficient operating FurnacesA duct furnace is normally installed in thedistribution duct of an air conditioningsystem to supply warm air for definition applies only to anappliance which depends for aircirculation on a blower not furnished aspart of the and experience gained fromthousands of installations over manyyears have gone into the design of theTrane gas-fired duct furnace.

7 No efforthas been spared to make this productone of the best obtainable. The objectivewas to produce an appliance that wouldbe low in first cost and installation cost,dependable in performance andendowed with long life under normaloperating FURNACES ARE APPROVED FORBLOW-THRU APPLICATIONS CombustionDuct FurnaceThe Trane separated combustion ductfurnace is designed to operate efficientlyand reliably, even in environments thatare dusty, dirty or mildly corrosive, orwhere high humidity or slightly negativepressure is Blower AssembliesTrane horizontal blower assemblies havebeen specially designed for air handlingsystems of high static pressure incombination with Trane duct are matched against the properfurnace size for greatest efficiency include:Industrial work areas with wood ortextile dustNon-explosive contaminatedenvironmentsNon-chlorine process areasAutomotive and truck garagesGreenhousesUH-PRC002-EN8 ApplicationConsiderationsnatural gas is not available, Trane unitsmay be ordered directly from the factoryfor use on LP (propane) heat content varies by fuel type andlocation.

8 The standard gross heatingvalue for natural gas is 1,000 Btu percubic foot, and for propane, 2,500 Btuper cubic foot. Significant variationsselections. To account for variations inthe gross Heating value of the fuel, adjustthe total heat input required and selectthe unit on the basis of the adjusted loadusing the following formula:Adjusted load = Calculated load xgross heat value (Btu/cu ft)Actual gross heat value (Btu/cu ft)Low Temperature RiseTrane recommends against the setup ofa unit which will result in a temperaturerise of less than 30 F. With such lowtemperature rises, the flue gases passingthrough the heat exchanger are cooledto condensate before reaching the flueoutlet. This condensate is corrosive andwill result in shortened heat DensityCatalog performance data is based onelevations up to 2,000 feet above sealevel. Above 2,000 feet the unit s heatingcapacity must be derated four percentfor each 1,000 feet above sea level, andspecial orifice selections are PAF-1 contains correction factorsthat can be applied to the unit scataloged Heating capacity, fan rpm, andfan bhp to obtain actual values forelevations above 2,000 AtmospheresCorrosion of heat exchangers and draftdiverters have two basic variables moisture (condensation) and two ingredients form to makesulfuric acid in the combustion occurs commonly inmakeup air systems, using largeamounts of fresh air, when airtemperatures entering the heatexchanger drop to 40 F or below.

9 Thisreaction can also occur in recirculatingsystems where some quantity of outsideair is introduced upstream of theexchanger. The sulphur will always bepresent as an integral component of thegas. The resulting concentration of theacid is governed by the amount ofsulphur in the gas. This concentrationvaries from gas to gas andgeographically within the same typeof sulfuric acid corrosion there isthe area of chlorinated or halogenatedhydrocarbon vapor corrosion. This typeof corrosion occurs when substances aremixed with combustion air that willcause the formation of hydrochloric orhydrofluoric acid when burned. Thesebasic substances are found indegreasers, dry cleaning solvents, glues,cements, paint removers and aerosolpropellants. Specific chemicals includedin this group are trichloroethylene,perchloroethylene, carbon tetrachloride,methylene chloride, methyl chloroformand refrigerants 11, 12, 21, 22 and sufficient PPM content of thesecorrosives is present, none of thecommon heat exchanger materials willhold up.

10 The dilemma becomes whetherto place the gas Heating equipmentoutside of the area to be conditioned, oruse equipment in the space which doesnot burn a fuel such as gas ( electric orhydronic).Units should not be installed in areaswith corrosive or inflammableatmospheres. Locations containingsolvents or chlorinated hydrocarbonswill produce corrosive acids whencoming in contact with burner reaction will greatly reduce the lifeof the heat exchanger and may void thewarranty. For added protection againstheat exchanger corrosion, optional 409and 321 stainless steel construction isavailable. On units using outside air, withentering air temperature below 40 F,condensation of flue gas in the heatexchanger is possible. In these cases,stainless steel heat exchangers review of the job application withrespect to use, probable contaminantswithin a conditioned space or theamount of fresh air to be brought in, willhelp to make the proper selection of heatexchanger material. This review will helpto eliminate problems before they : When installing duct furnaces inparallel or in series, minimum clearancerequirements must be considered.