Desa CDCFPRA Operation And Installation Manual

Also see for CDCFNRA: OWNER'S OPERATION AND INSTALLATION MANUAL OWNER'S OPERATION AND INSTALLATION MANUAL

Contents

www.desatech.com116658-01D 73. Add the Btu/Hr of all fuel burning appliances inthe space.Vent-free fireplace ___________ 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. Di-rect-vent draws combustion air from the outdoorsand vents to the outdoors.Example: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: 35,840 Btu/Hr (maximum the spacecan support)40,000 Btu/Hr (actual amount ofBtu/Hr used)The space in the above example is a confined spacebecause the actual Btu/Hr used is more than the maxi-mum Btu/Hr the space can support. You must provideadditional 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, page 8.B. Vent room directly to the outdoors. See Ventila-tion Air From Outdoors, page 8.C. Install a lower Btu/Hr fireplace, if lower Btu/Hrsize makes room unconfined.If the actual Btu/Hr used is less than the maximum Btu/Hrthe space can support, the space is an unconfined space.You will need no additional fresh air ventilation.WARNING: If the area inwhich the fireplace 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.aiR FoR ComBUsTioNaND VENTilaTioNContinuedConfined and Unconfined SpaceThe National Fuel Gas Code, ANSI Z223.1/NFPA54 defines a confined space as a space whosevolume is less than 50 cubic feet per 1,000 Btuper hour (4.8 m3 per kw) of the aggregate inputrating of all appliances installed in that space andan unconfined space as a space whose volume isnot less than 50 cubic feet per 1,000 Btu per hour(4.8 m3 per kw) of the aggregate input rating ofall appliances installed in that space. Rooms com-municating directly with the space in which theappliances are installed*, through openings notfurnished with doors, are considered a part of theunconfined space.* Adjoining rooms are communicating only ifthere are doorless passageways or ventilation grillsbetween them.DETERMINING FRESH-AIR FLOWFOR FIREPLACE 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 installfireplace plus any adjoining rooms with doorless pas-sageways or ventilation grills between the rooms.1. Determine the volume of the space (length xwidth x height).Length x Width x Height =__________cu. ft.(volume of space)Example: Space size 16 ft. (length) x 14 ft.(width) x 8 ft. (ceiling height) = 1792 cu. ft.(volume of space)If additional ventilation to adjoining room issupplied with grills or openings, add the volumeof these rooms to the total volume of the space.2. Multiply the space volume by 20 to determinethe maximum Btu/Hr the space can support.__________ (volume of space) x 20 = (Maxi-mum Btu/Hr the space can support)Example: 1792 cu. ft. (volume of space) x 20 =35,840 (maximum Btu/Hr the space can support)30,000+ 10,000= 40,000