Cold Weather Catalog - Chromalox Precision Heat and Control

ComfortUBHigh CapacityHorizontal Blower HeaterFORCED AIR• 2 - 50 kW• 6,820 - 170,600 Btuh• 120, 208, 240, 277, 480and 550 Volt• 1 or 3 Phase• Wall or Ceiling MountedConfigurationsDescriptionRugged, industrial UB heaters are ideal forfactories, warehouses, garages or any otherarea that requires a high volume of forced-airheat.Applications• Entryway Air-Curtain Heating• Power Generating Stations• Factories• Freeze Protection of MachineryConstruction (2 - 50 kW models)Painted Finish — For attractive appearanceand corrosion resistance.Cabinet — 16 gauge steel cabinet constructionsupported with an 18 gauge base assemblyand fi nished in almond powder.Louvers — Adjustable discharge grille todirect the air fl ow up or down.Heavy Gauge Rear Wire Grille protectsagainst accidental contact with rapidly rotatingfan blade.Refer toWR-80, WR-90in the Controls section.Metal Sheath Fintube ® Heating Elements —The electric heat bank - Chromalox patentedmetal sheath Fintube ® heating elements. Heatradiation fi ns are corrosion-resistant coppercladsteel, furnace brazed to the tubular heatingelements to assure superior heat transfer.Wide spacing prevents clogging. Air is evenlydrawn across the circumferential elementspreventing hot spots and prolonging elementlife.Rugged Motor and Dynamically BalancedFan provides a high volume of hot air.Integral Automatic Reset Thermal Cutout forfast heat response and overheat protection.Features (2 - 20 kW models)Fan Only Operation — UB-23 and UB-32,(excluding the 120V UB-32), have a separatefan control switch for circulating air duringsummer months.Totally Enclosed Fan Motor — Continuousduty with built-in automatic reset thermaloverload protection operates on same voltageas supplied to the heater, except on 480 and550 volt where motor is either 115 or 230volts. All motors are single phase with sleevebearings.Heaters with model numbers having a suffi x“T” include a transformer to stepdown thevoltage for operating the fan motor.External contactor is not necessary with heatershaving a model number suffi x “R”.Wall or Ceiling Mounting Brackets are availableseparately for fi eld installation dependingon mounting arrangement desired.Features (25 - 50 kW models)Universal Wall & Ceiling Mounting Bracket isincluded to provide fl exibility in the mountingarrangement.Fan Interlock — Fan motor contactor includesa set of auxiliary contacts to prevent heatingelements from being energized unless contactsof fan motor contactor are closed.Thermal Fan Delay allows fan motor tocontinue to operate after heating thermostathas been satisfi ed to maximize transfer of generatedheat to space being heated and extendoperating life of heating elements.Built-in Controlling Contactors and Line Fusing— All heaters drawing 48 Amps or greaterare sub-divided into two (2) circuits withbuilt-in line fuses and controlling contactors.Units drawing less than 48 Amps have built-incontactors only, line fusing must be providedexternally. All units regardless of amperagerating have built-in fuse protection for the motorand transformer.Integral 120V Control Circuit — 120 voltpower for the control circuit is provided fromthe unit mounted transformer to eliminatethe need to run separate power to the unit forcontrol.Heavy Duty 1/3 HP Motor operates at 1,550RPM on line voltage. Motor has built-inthermal overload protection, permanently lubricatedball bearings and factory installed linefuses for maximum trouble-free service life.Advantages• Low Maintenance• High Capacity• Primary Heating• Supplementary Heating• Dual System Heating• Long Horizontal Air Throw• Long Life15