Stimmen - 3, Durchschnittliche Bewertung: 3.7 ( )

Hersteller: Superior Dateigröße: 1.06 mb Dateiname: Lennox_Hearth_UVFRC_UVF_Installation_700032M.pdf Unterrichtssprache:

(1430 Broadway, New York, NY, 10018) or National Fire Protection Association, Inc. (Batterymarch Park, Quincy, MA, 02269). COMBUSTION AND VENTILATION AIR Heaters installed in these appliances shall not be installed in a confined space. Heaters installed in these appliances may be located in unusually tight construction provided the space is unconfined, or if confined, is provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all connected spaces meets the criteria for an unconfined space, (National Fuel Gas Code ANSI Z223.1 1992, Section 5.3). Generally 50 ft 3 per 1,000 BTU input of all operating appliances in the space. The National Fuel Gas Code defines a confined space as a space whose volume is less than 50 ft 3 per 1,000 BTU/Hr (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 ft 3 per 1,000 BTU/Hr (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfi ned space. Unusually tight construction is defined as construction where: a. Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one perm or less with openings gasketed or sealed, and b. Weather stripping has been added on operable windows and doors, and c. Caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other openings. Use the following equations to determine if you have a confi ned or unconfi ned space. 1. Determine the volume of space — ft 3. Length x Width x Height = _____ ft 3 (Include adjoining rooms with doorless passageways or ventilation grills between rooms). Example: 24' (L) x 16' (W) x 8' (H) = 3072 ft 3 2. Divide the volume of space by 50 ft 3 to determine the maximum BTU/Hr the space can support. (volume of space – ft 3)/ 50 ft 3 = (Maximum BTU/Hr the space can support) Example: 3072 ft 3 / 50 ft 3 = 61.44 or 61,440 BTU/Hr the space can support. 3. Add the BTU/Hr of all the fuel burning appliances in the space. Vent-Free heater ________ BTU/Hr Gas appliance #1* ________ BTU/Hr Gas appliance #2 +________ BTU/Hr Total =________ BTU/Hr Example: Vent-free heater 26,000 BTU/Hr Gas appliance #1 40,000 BTU/Hr (water heater) Total = 66,000 BTU/Hr * Do not include direct-vent gas appliances. Direct-vent is sealed combustion and draws combustion air from the outdoors. 4. Compare the maximum BTU/Hr the space can support with the actual amount of BTU/Hr used. _________ BTU/Hr (max. the space can support) _________ BTU/Hr (actual amount of BTU/Hr used) Example: 61,440 BTU/H...

Herunterladen

Geben Sie zwei Ziffern: