Electric Unit Heaters - Trane

1 Electric unit HeatersUH-PRC003-ENAugust 2005 Model UHECM odel UHXAM odel UHWAM odel UHAAM odel UHRAM odel UHCA 2005 American Standard Inc. All rights unit Heaters have been a traditional means of heating hard-to-warm spaces for many years. Their uncomplicatedapproach in auxiliary heating make them easy to install and maintain. Their versatile characteristics allow Trane selectric unit Heaters to fill nearly every heating application gap, while their structural integrity makes them a reliableheat source to blend into today s building d s Electric unit Heaters are available in 6 variations. The following chart presents a brief overview of the differentelectric unit heater models Trane and Vertical SpotHeating Electric unit HeaterApplied as an auxiliary heat sourcein walkways, stairways, vestibules,and entrances.

2 The horizontal andvertical spot heater may be used incommercial, industrial andinstitutional , Corrosion-ResistantElectric unit HeaterUsed in industrial applications wheredirt or dust may be extensive. Thetotally enclosed, watertight casing iscorrosion-resistant for 3 to 25 kWExplosion-Proof Electric unit HeaterDesigned for hazardous locations, theUHXA model may be applied whereflammable gases, vapors, powderedmetals or dust may be , Ceiling-MountedElectric unit HeaterThe surface- or recessed mountedmodel may be applied in restrictedareas or where wall space is may included vestibules, lobbies,rest rooms, small-offices or 3 to 48 kWUHWA 2 to 5 kWHeavy Duty, Wall MountedElectric unit HeaterSeries 20 and 50 Suited for public buildings such asschools, stores, offices, dormitories,hospitals and to kWArchitectural Wall MountedElectric unit HeaterThe rugged construction andattractive design of the UHAA modelmake them appropriate for offices,lobbies.

3 And reception areas forschools and 2 to 5 kWUHEC 3 to 50 kW3 ContentsUH-PRC003-ENIntroductionFeatures and BenefitsApplication ConsiderationsSelection ProcedureModel NumberGeneral DataControl WiringDimensional DataOptionsMechanical Specifications241314151929323942UH-PRC00 3-EN4 Features andBenefitsModel UHECE lectric unit Heaters Thirty-seven models to choose fromranging from to 50 kW. Available for208, 240/208, 277 or 480-volt operation. One unit can be used for eitherhorizontal or vertical discharge. Specially designed inlet louvers, venturiand outlet diffuser provide uniform airtemperature and throw characteristics. Single-phase units, easily converted tothree-phase power, are available in 10 kW for 208 and 240-voltoperation. Two-speed fan operation standard on25 kW units and above. Meets all requirements of UL listingstandard 1278 when installed Electric unit Heaters are ideal forapplications ranging from newconstruction to auxiliary heat torenovation.

4 They are available in 37models ranging from kW to 50 kW. Inaddition to a wide capacity range, eachcompact, attractive unit can be mountedin either a horizontal or vertical Trane Electric unit heater shows itsflexibility in installation and for industrial, commercial orinstitutional use, the Trane Electric unitheater is available for 208 to 480-volt,single or three-phase operation. Unitsfrom to 10 kW for 208 and 240-voltoperation may be converted easily fromsingle to three-phase operation in thefield. Two-speed fan operation on 25 kWunits and above provides greater Air DistributionThe Trane unit heater uniformly directsthe air to exactly where it s needed. Aspecially designed deep-drawn venturiassures uniform air distribution. Theoutward-drawn venturi channels the airforward for maximum, uniform air diffusers are provided to properlydirect the heated discharge order to minimize the potential for hotspots on the heating coil, inlet louversevenly distribute intake air over the entireheating Electric unit Heaters are designedwith totally enclosed, permanentlylubricated industrial motors.

5 Theair-over-motor design reduces operatingtemperatures, promoting long motor overloads provide additionalprotection for major circuits, in casenormal operating temperatures and EasyLow-Cost InstallationInstallation time and costs are and completely factory wired,the Trane Electric unit heater requiresonly a single-source power supplyconnection. The units are available withfactory installed 24-volt controltransformers and Panel Single-point terminalboard wiring for easy control Die-formed heavy-gauge steelwith baked enamel Louvers Individually adjustablefrom 30 up to 45 and Fan Totally enclosed,permanently lubricated, sealed bearing,all-angle motor and fan combinationthrough 20 kW and two-speed permanentcapacitor-type motor on 25 through 50kW All units 25 kW and largerare equipped with two contactors andtwo element banks for either single ortwo-stage heating Element, motor and transformerprimary fusing are factory installed andwired where required to NEC.

6 Branchcircuit fusing installed where required on48 amps and Louvers Designed to provideuniform air distribution across entireheating High mass, all steel finned,tubular heating 24-volt control circuit forcloser temperature control and addedsafety. Standard on most models,optional on and 5 kW 208, 240/208,277-volt Overloads Automatic resetthermal cutouts disconnect motor andelement in the event normal operatingtemperatures are Panel Full width access panelsecured by quarter-turn andBenefitsModel UHECM ounting the unit is easily accomplishedwith the use of hanger rods connected toweld nuts on the unit casing. Anaccessory mounting bracket is availablefor single-point mounting. Field installedaccessories such as built-in thermostats,disconnect switches and summer fanswitches are provided with spadeterminals for easy installation to a single-point terminal OperationTrane Electric UHEC unit Heaters operatereliably when installed and operated asdirected.

7 In addition to meeting allrequirements of UL listing standard 1025,the heating element is backed with a five-year AccessIn the event that service is required, easyaccess to the control components isprovided with a full-length access panelsecured by quarter-turn fasteners. Foradded convenience, unit wiring diagramsare located inside the access panel foreasy reference during installation DischargeVertical DischargeUH-PRC003-EN6 Features andBenefitsModel UHRAHose-Down Electric unit HeatersTrane UHRA hose-down Electric unitheaters are constructed for use in areasthat require washing or hosing ofequipment due to a dirty or dustyindustrial environment innon- hazardous locations. Thetotally enclosed, watertight casing madewith corrosion-resistant material, makesthe unit ideal for industrial heatingapplications.

8 All controls are built-in andthe safety temperature controls arewired in a nonmetallic NEMA 4x controlpanel with single-point Features Heavy-duty 304 stainless steel casing NEMA 4x nonmetallic control panel 24-volt transformer and control circuit Three-position switch (off - heat - fan) Disconnect switch with enclosureinterlock Capillary thermostat with stainless steelsensor Automatic reset thermal cutout Totally enclosed UL listed motor Pilot light (power on indicator) Chrome-plated finned tubular element Control panel on bottom of unit for easeof installation and service Single-point power connection Meets all UL, NEC and OSHA requirements (when installed asdirected) Corrosion-resistant in high humidity andwater-saturated areas (for areas wherecorrosion-resistance is needed innon-hazardous areas).

9 304 Stainless Steel CasingControl Components (24-Volt Standard)NEMA 4x Non-Metallic EnclosureElementStainless SteelDischarge GrilleEasy-mount bracket for Use withField- Installed Hanger or OptionalMounting BracketsDoor InterlockDisconnect Switch(Optional)Pilot Light (HeaterEnergized)Three-Position Fan SwitchThermostatAluminum Fan BladeTotally Enclosed MotorPlated Inlet GrilleControl Enclosure7UH-PRC003-ENFeatures andBenefitsModel UHXAT rane Explosion-ProofElectric unit HeatersPressure Relief ValveRated at 200 PSIS piral Aluminum Finned Tubular SteelHeat Exchanger Core Liquid FilledOperation (see page 3)14-Gauge Steel AdjustableLouvers with MinimumPosition StopsEpoxy Coated 14-Gauge Cold RolledSteel CabinetCast Aluminum Control Enclosurewith Oversized OpeningBuilt-In Load Carrying ContactorProtective Heating Element CoverCopper Sheathed Immersion TypeHeating ElementHigh Performance Aluminum FanBlades (not shown)Etched Aluminum Data PlatesRiveted to CaseUH-PRC003-EN8 Features andBenefitsModel UHXAL iquid to air heat exchanger with lowwatt density heating elements inethylene glycol solution that providesfreeze protection to -45 bearing permanently lubricatedexplosion-proof motor.

10 Chrome platedguard meets OSHA control contactor with24-volt control circuit provided on for rugged industrialapplications in hazardous locationswhere the possibility of explosion or fireexists due to the presence of certainflammable gases, vapors, powderedmetals or dusts. Permanently sealed, liquid to air, finnedtube heat exchanger core. Ethylene glycol water mixture used asheat transfer fluid in the heater core,providing -45 C, (-49 F) freeze damageprotection. High-performance Electric motordriven fan blows air across finned tubesto effect uniform heat transfer and areaheat distribution. Automatic reset capillary type high limitprovides high temperature regulationand is rated for 100,000 cycles ofservice. Stainless steel and aluminum pressurerelief valve handles any over-pressure. 14-gauge steel cabinet contains heatercore, motor and fan assembly.