Desa V32S Owner's Operation And Installation Manual

Contents

www.desatech.com 108662-01K8deteRmINING FResh-AIR FloWFoR heAteR locAtIoNDetermining if You Have a Confined orunconfined spaceUse this work sheet to determine if you havea confined or unconfined space.space: Includes the room in which you willinstall heater plus any adjoining rooms withdoorless passageways or ventilation grillsbetween the rooms.1. Determine the volume of the space (lengthx width x height).Length x Width x Height = ______cu. ft.(volume of space)Example: Space size 22 ft. (length) x 18ft. (width) x 8 ft. (ceiling height) = 3168 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 deter-mine the maximum Btu/Hr the space cansupport._____ (volume of space) x 20 = (Maxi-mum Btu/Hr the space can support)Example: 3168 cu. ft. (volume of space) x20 = 63,360 (maximum Btu/Hr the spacecan support)3. Add the Btu/Hr of all fuel burning appli-ances in 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 appli-ances. Direct-vent draws combustionair from the outdoors and vents to theoutdoors.Example:Gas water heater _________ Btu/HrVent-free heater + ________ Btu/HrTotal = ________ Btu/HrAIR FOR COMBUSTION AND VENTILATIONContinued4. Compare the maximum Btu/Hr the spacecan support with the actual amount ofBtu/Hr used._________ Btu/Hr (maximum the spacecan support)_________ Btu/Hr (actual amount ofBtu/Hr used)Example: 63,360 Btu/Hr (maximum thespace can support)79,000 Btu/Hr (actual amountof Btu/Hr 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.Your options are as follows:A. Rework worksheet, adding the spaceof an adjoining room. If the extra spaceprovides an unconfined space, removedoor to adjoining room or add ventilationgrills between rooms. See Ventilation AirFrom Inside Building, page 9.B. Vent room directly to the outdoors. SeeVentilation Air From Outdoors, page 9.C. Install a lower Btu/Hr heater, if lowerBtu/Hr size makes room unconfined.If the actual Btu/Hr used is less than themaximum Btu/Hr the space can support, thespace is an unconfined space. You will needno additional fresh 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.40,00039,00079,000