Desa HDVF3018N Owner's Operation And Installation Manual

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Desa HDVF3018N Owner's Operation And Installation Manual Manual pdf 7 page image

www.desatech.com119421-01A 7Example:Gas water heater ____________ Btu/HrVent-free fireplace + ___________ Btu/HrTotal = ___________ Btu/Hr4. Compare the maximum Btu/Hr the space cansupport with the actual amount of Btu/Hr used._________Btu/Hr (maximum the space can support)_________Btu/Hr (actual amount of Btu/Hr used)Example: 51,200 Btu/Hr (maximum the spacecan support)79,000 Btu/Hr (actual amount ofBtu/Hr used)The space in the example is a confined space becausethe actual Btu/Hr used is more than the maximumBtu/Hr the space can support. You must provide ad-ditional fresh air. Your options are as follows:A. Rework worksheet, adding the space of an adjoin-ing room. If the extra space provides an unconfinedspace, remove door to adjoining room or addventilation grills between rooms. See VentilationAir From Inside Building.B. Vent room directly to the outdoors. See Ventila-tion Air From Outdoors.C. Install a lower Btu/Hr fireplace, if lower Btu/Hrsize makes room unconfined.If the actual Btu/Hr used is less than the maximumBtu/Hr the space can support, the space is an un-confined space. You will need no additional freshair ventilation.WARNING: If the area inwhich the heater may be oper-ated is smaller than that definedas an unconfined space or if thebuilding is of unusually tightconstruction, provide adequatecombustion and ventilation airby one of the methods describedin the National Fuel Gas Code,ANSI Z223.1/NFPA 54 Section 5.3or applicable local codes.VENTILATION AIRVentilation Air From Inside BuildingThis fresh air would come from an adjoining un-confined space. When ventilating to an adjoiningunconfined space, you must provide two perma-nent openings: one within 12" of the ceiling andone within 12" of the floor on the wall connectingthe two spaces (see options 1 and 2, Figure 2). Youcan also remove door into adjoining room (seeoption 3, Figure 2). Follow the National Fuel GasCode, ANSI Z223.1/NFPA 54, Section 5.3, Air forCombustion and Ventilation for required size ofventilation grills or ducts.AIR FOR COMbUSTIONAND VENTILATIONContinued40,00039,00079,000Figure 3 - Ventilation Air from OutdoorsFigure 2 - Ventilation Air from InsideBuildingOutletAirVentilatedAtticOutletAirInletAirInlet Air VentilatedCrawl SpaceToCrawlSpaceTo AtticOrRemoveDoor intoAdjoiningRoom,Option3Ventilation GrillsInto Adjoining Room,Option 2VentilationGrillsInto AdjoiningRoom,Option 112"12"Ventilation Air From OutdoorsProvide extra fresh air by using ventilation grills orducts. You must provide two permanent openings:one within 12" of the ceiling and one within 12"of the floor. Connect these items directly to theoutdoors or spaces open to the outdoors. Thesespaces include attics and crawl spaces. Follow theNational Fuel Gas Code, ANSI Z223.1/NFPA 54,Section 5.3, Air for Combustion and Ventilation forrequired size of ventilation grills or ducts.IMPORTANT: Do not provide openings for inletor outlet air into attic if attic has a thermostat-controlled power vent. Heated air entering the atticwill activate the power vent.