Desa HDCFTN Owner's Operation And Installation Manual

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

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Desa HDCFTN Owner's Operation And Installation Manual Manual pdf 7 page image

www.desatech.com111044-01F 7Unusually tight construction is defined asconstruction where:a. walls and ceilings exposed to the out-side atmosphere have a continuouswater vapor retarder with a rating ofone perm (6 x 10-11 kg per pa-sec-m2)or less with openings gasketed orsealed andb. weather stripping has been added onopenable windows and doors andc. caulking or sealants are applied toareas such as joints around windowand door frames, between sole platesand floors, between wall-ceiling joints,between wall panels, at penetrationsfor plumbing, electrical and gas linesand at other openings.If your home meets all of the three criteriaabove, you must provide additional fresh air.See Ventilation Air From Outdoors, page 8.If your home does not meet all of the threecriteria above, proceed to DeterminingFresh-Air Flow For Fireplace Location.Confined and Unconfined SpaceThe National Fuel Gas Code, ANSI Z223.1/NFPA54 defines a confined space as a space whose vol-ume is less than 50 cubic feet per 1,000 Btu per hour(4.8 m3 per kw) of the aggregate input rating of allappliances installed in that space and an unconfinedspace as a space whose volume is not less than 50cubic feet per 1,000 Btu per hour (4.8 m3 per kw) ofthe aggregate input rating of all appliances installedin that space. Rooms communicating directly withthe space in which the appliances are installed*,through openings not furnished with doors, areconsidered a part of the unconfined space.* Adjoining rooms are communicating only ifthere are doorless passageways or ventilation grillsbetween them.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 willinstall heater plus any adjoining rooms with door-less passageways or ventilation grills betweenthe rooms.AIR FOR COMBUSTIONAND VENTILATIONContinued1. 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) = 2560 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: 2560 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)56,000 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.30,00026,00056,000