Desa HL18N Owners Manual And Installation Manual

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Desa HL18N Owners Manual And Installation Manual Manual pdf 7 page image

www.desatech.com122136-01C 7Example:Gas water heater __________ Btu/HrVent-free fireplace + _________ Btu/HrTotal = _________ Btu/Hr4. Compare the maximum Btu/Hr the spacecan support with the actual amount of Btu/Hr used._______ Btu/Hr (maximum the space cansupport)_______ Btu/Hr (actual amount of Btu/Hrused)Example: 51,200 Btu/Hr (maximum thespace can support)71,500 Btu/Hr (actual amount ofBtu/Hr used)The space in the example is a confined spacebecause the actual Btu/Hr used is more than themaximum Btu/Hr the space can support. Youmust provide additional fresh air. Your optionsare as follows:A. Rework worksheet, adding the space of anadjoining room. If the extra space provides anunconfined space, remove door to adjoiningroom or add ventilation grills between rooms.See Ventilation Air From Inside Building,page 7.B. Vent room directly to the outdoors. SeeVentilation Air From Outdoors, page 7.C. Install a lower Btu/Hr fireplace, if lower Btu/Hr size makes room unconfined.If the actual Btu/Hr used is less than the maxi-mum Btu/Hr the space can support, the space isan unconfined space. You will need no additionalfresh air ventilation.WARNING: If the area in whichthe heater may be operated doesnot meet the required volume forindoor combustion air, combus-tion and ventilation air shall beprovided by one of the methodsdescribed in the National FuelGas Code, ANSI Z223.1/NFPA 54,the International Fuel Gas Code,or applicable local codes.VENTILATION AIRVentilation Air From Inside BuildingThis fresh air would come from an adjoiningunconfined space. When ventilating to anadjoining unconfined space, you must providetwo permanent openings: one within 12" of the40,00031,50071,500AIR FOR COMbUSTION AND VENTILATIONContinuedFigure 2 - Ventilation Air from InsideBuildingOrRemoveDoor intoAdjoiningRoom,Option3Ventilation GrillsInto Adjoining Room,Option 2VentilationGrills IntoAdjoiningRoom,Option 112"12"Figure 3 - Ventilation Air from OutdoorsOutletAirVentilatedAtticOutletAirInletAirInlet Air VentilatedCrawl SpaceToCrawlSpaceTo Atticceiling and one within 12" of the floor on thewall connecting the two spaces (see options1 and 2, Figure 2). You can also remove doorinto adjoining room (see option 3, Figure 2).Follow the National Fuel Gas Code ANSIZ223.1/NFPA 54, Air for Combustion andVentilation for required size of ventilationgrills or ducts.Ventilation Air From OutdoorsProvide extra fresh air by using ventilationgrills or ducts. You must provide two perma-nent openings: one within 12" of the ceilingand one within 12" of the floor. Connect theseitems directly to the outdoors or spaces opento the outdoors. These spaces include atticsand crawl spaces. Follow the National FuelGas Code ANSI Z223.1/NFPA 54, Air forCombustion and Ventilation for required sizeof ventilation grills or ducts.IMPORTANT: Do not provide openings forinlet or outlet air into attic if attic has a thermo-stat-controlled power vent. Heated air enteringthe attic will activate the power vent.