Desa VMH3000TPA Owner's Operation And Installation Manual

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109889For more information, visit www.desatech.comFor more information, visit www.desatech.com6PROVIDING ADEQUATE VENTILATIONThe following are excerpts from National Fuel Gas Code, ANSIZ223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation.All spaces in homes fall into one of the three following ventilationclassifications:1. Unusually Tight Construction2. Unconfined Space3. Confined SpaceThe information on pages 5 through 7 will help you classify yourspace and provide adequate ventilation.Unusually Tight ConstructionThe air that leaks around doors and windows may provide enoughfresh air for combustion and ventilation. However, in buildings ofunusually tight construction, you must provide additional fresh air.Unusually tight construction is defined as constructionwhere:a. walls and ceilings exposed to the outside atmospherehave a continuous water vapor retarder with a ratingof one perm (6 x 10-11 kg per pa-sec-m2 ) or less withopenings gasketed or sealedandb. weather stripping has been added on openable win-dows and doorsandc. caulking or sealants are applied to areas such asjoints around window and door frames, between soleplates and floors, between wall-ceiling joints, betweenwall panels, at penetrations for plumbing, electrical,and gas lines, and at other openings.If your home meets all of the three criteria above, youmust provide additional fresh air. SeeVentilation AirFrom Outdoors, page 7.If your home does not meet all of the three criteria above,proceed toDetermining Fresh-Air Flow for Heater Location.Confined and Unconfined SpaceThe National Fuel Gas Code, ANS Z223.1 defines a confined spaceas a space whose volume is less than 50 cubic feet per 1,000 Btu perhour (4.8 m 3 per kw) of the aggregate input rating of all appliancesinstalled in that space and an unconfined space as a space whosevolume is not less than 50 cubic feet per 1,000 Btu per hour (4.8 m3per kw) of the aggregate input rating of all appliances installed inthat space. Rooms communicating directly with the space in whichthe appliances are installed*, through openings not furnished withdoors, are considered a part of the unconfined space.* Adjoining rooms are communicating only if there are doorlesspassageways or ventilation grills between them.AIR FOR COMBUSTION ANDVENTILATIONContinuedDETERMINING FRESH-AIR FLOW FORHEATER LOCATIONDetermining if You Have a Confined orUnconfined SpaceUse this work sheet to determine if you have a confined or unconfined space.Space: Includes the room in which you will install heater plus any adjoiningrooms with doorless passageways or ventilation grills between the rooms.1. Determine the volume of the space (length x 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. (ceilingheight) = 2560 cu. ft. (volume of space)If additional ventilation to adjoining room is supplied with grills or open-ings, add the volume of these rooms to the total volume of the space.2. Multiply the space volume by 20 to determine the maximum Btu/Hrthe space can support.__________ (volume of space) x 20 = (Maximum Btu/Hr the spacecan support)Example: 2560 cu. ft. (volume of space) x 20 = 51,200 (maximumBtu/Hr the space can support)3. Add the Btu/Hr of all fuel burning appliances 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 appliances. Direct-vent draws com-bustion air from the outdoors and vents to the outdoors.Example:Gas water heater _____________ Btu/HrVent-free heater + _____________ Btu/HrTotal = _____________ Btu/Hr4. Compare the maximum Btu/Hr the space can support with the actualamount 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 space can support)60,000 Btu/Hr (actual amount of Btu/Hr used)30,00030,00060,000AIR FOR COMBUSTION AND VENTILATIONProviding Adequate VentilationDetermining Fresh Air Flow For Heater Location