Desa VP10A. VN10TA Owner's Operation And Installation Manual

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Desa VP10A. VN10TA Owner's Operation And Installation Manual Manual pdf 6 page image

www.desatech.com 110720-01G6AIR FOR COMBUSTIONAND VENTILATIONContinuedDETERMINING 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 20 ft. (length) x 16 ft.(width) x 8 ft. (ceiling height) = 2,560 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: 2,560 cu. ft. (volume of space) x 20 =51,200 (maximum Btu/Hr the space can support)3. Add the Btu/Hr of all fuel burning appliances inthe 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. Di-rect-vent draws combustion air from the outdoorsand vents to the outdoors.Example:Gas water heater ______________ Btu/HrVent-free heater + _____________ 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)60,000 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, page 7.C. Install a lower Btu/Hr heater, if lower Btu/Hr sizemakes room unconfined.If the actual Btu/Hr used is less than the maximumBtu/Hr the space can support, the space is an uncon-fined space. You will need no additional fresh airventilation.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 permanentopenings: one within 12" of the ceiling and onewithin 12" of the floor on the wall connecting thetwo spaces (see options 1 and 2, Figure 2, page 7).You can also remove door into adjoining room (seeoption 3, Figure 2, page 7). Follow the National FuelGas Code, ANSI Z223.1/NFPA 54, Section 5.3, Airfor Combustion and Ventilation for required sizeof ventilation grills or ducts.50,00010,00060,000