Desa NY100 Safety Information And Installation Manual

Contents

www.desatech.com 118620-01E6AIR FOR COMBUSTIONAND VENTILATIONContinued40,00020,00060,0004. Compare the maximum Btu/Hr the spacecan support with the actual amount of Btu/Hrused._______ Btu/Hr (maximum can support)_______ Btu/Hr (actual amount used)Example:51,200 Btu/Hr (maximum can support)60,000 Btu/Hr (actual amount used)The space in the above example is a confinedspace because the actual Btu/Hr used is morethan the maximum Btu/Hr the space can sup-port. You must provide additional fresh air. Youroptions are as follows:A. Rework worksheet, adding the space of anadjoining room. If the extra space providesan unconfined space, remove door to adjoin-ing room or add ventilation grills betweenrooms. See Ventilation Air From InsideBuilding, page 7.B. Vent room directly to the outdoors. SeeVentilation Air From Outdoors, page 7.C. Install a lower Btu/Hr heater, if lower Btu/Hrsize 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 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.DETERMINING FRESH-AIR FLOWFOR HEATER LOCATIONDetermining if You Have a Confined orUnconfined SpaceUse this work sheet to determine if you have aconfined or unconfined space.Space: Includes the room in which you will installheater plus any adjoining rooms with doorlesspassageways or ventilation grills between therooms.1. Determine the volume of the space (lengthx width x height).Length x Width x Height =__________cu. ft.(volume of space)Example: Space size 20 ft. (length) x 16 ft.(width) x 8 ft. (ceiling height) = 2560 cu. ft.(volume of space)If additional ventilation to adjoining roomis supplied with grills or openings, add thevolume of these rooms to the total volumeof the space.2. Multiply the space volume by 20 to determinethe maximum Btu/Hr the space can support.______ (volume of space) x 20 = (MaximumBtu/Hr the space can support)Example: 2560 cu. ft. (volume of space) x 20 =51,200 (maximum Btu/Hr the space can sup-port)3. Add the Btu/Hr of all fuel burning appliancesin the space.Vent-free heater ____________ Btu/HrGas water heater* ____________ Btu/HrGas furnace ____________ Btu/HrVented gas heater ____________ Btu/HrGas fireplace logs ____________ Btu/HrOther gas appliances* + ___________ Btu/HrTotal = ___________ Btu/Hr* Do not include direct-vent gas appliances.Direct-vent draws combustion air from theoutdoors and vents to the outdoors.Example:Gas water heater ____________ Btu/HrVent-free heater + ___________ Btu/HrTotal = ___________ Btu/Hr