Desa EFP33NR Owner's Operation And Installation Manual

Also see for Comfort Glow CGEFP33NR: OWNER'S OPERATION AND INSTALLATION MANUAL OWNER'S OPERATION AND INSTALLATION MANUAL OWNER'S OPERATION AND INSTALLATION MANUAL

108117-01HFor more information, visit www.desatech.comFor more information, visit www.desatech.com6AIR 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 18 ft. (width) x 8 ft. (ceilingheight) = 2880 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: 2880 cu. ft. (volume of space) x 20 = 57,600 (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: 57,600 Btu/Hr (maximum the space can support)73,000 Btu/Hr (actual amount of Btu/Hr used)The space in the above example is a confined space because the actual Btu/Hrused is more than the maximum Btu/Hr the space can support. You mustprovide additional fresh air. Your options are as follows:WARNING: If the area in which the heater may beoperated is smaller than that defined as an uncon-fined space or if the building is of unusually tightconstruction, provide adequate combustion and ven-tilation air by one of the methods described in theNational Fuel Gas Code, ANSI Z223.1/NFPA 54 Sec-tion 5.3 or applicable local codes.A. Rework worksheet, adding the space of an adjoining room. If theextra space provides an unconfined space, remove door to adjoiningroom or add ventilation grills between rooms. See Ventilation Air FromInside Building.B. Vent room directly to the outdoors. See Ventilation Air From Out-doors, page 7.C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.If the actual Btu/Hr used is less than the maximum Btu/Hr the space cansupport, the space is an unconfined space. You will need no additional freshair ventilation.40,00033,00073,000AIR FOR COMBUSTION AND VENTILATIONDetermining Fresh-Air Flow For Heater LocationVentilation AirVENTILATION AIRVentilation Air From Inside BuildingThis fresh air would come from an adjoining unconfined space.When ventilating to an adjoining unconfined space, you mustprovide two permanent openings: one within 12" of the ceiling andone within 12" of the floor on the wall connecting the two spaces(see options 1 and 2, Figure 3). You can also remove door intoadjoining room (see option 3, Figure 3). Follow the National FuelGas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustionand Ventilation for required size of ventilation grills or ducts.Figure 3 - Ventilation Air from Inside Building (EFP33PR Shown)OrRemoveDoor intoAdjoiningRoom,Option3Ventilation GrillsInto Adjoining Room,Option 2VentilationGrillsInto AdjoiningRoom,Option 112"12"