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Hersteller: Lennox Hearth Dateigröße: 598.98 kb Dateiname: Lennox_Hearth_CF_Installation_904538.pdf Unterrichtssprache:

(Batterymarch Park, Quincy, MA, 02269). All electrical wiring must be in accordance with local codes or in the absence of local codes the latest edition of the National Electrical Code, ANSI/NFPA 70. COMBUSTION AND VENTILATION AIR These heaters shall not be installed in a confined space. The heater 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 unconfined space. Unusually tight construction is defined as construction where: a. wall 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 confined or unconfined 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 x 1000 = (Maximum BTU/hr the space can support) Example: 3072 ft 3 / 50 ft 3 x 1000 = 61.44 or 61,440 BTU/hr the space can support. 3. 3. ances in the space. Vent-Free heater (Max.) ______ BTU/hr Gas appliance #1* ______ BTU/hr Gas appliance #2 + ______ BTU/hr Total = ______ BTU/hr Example: CF6500 Catalytic heater 29,000 BTU/hr Gas appliance #1 34,000 BTU/hr (water heater) Total = 63,000 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/hr (max. the space can support) 63,000 BTU/Hr (actual amount of BTU/hr used) The space in the above example is a confined space because the actual BTU/hr used is more than the maximum BTU/hr the space can support. You must provide additional fresh air. WARNING: IF THE AREA IN WHICH THE HEATER MAY BE OPERATED IS SMALLER THAN THAT DEFINED AS AN UNCONFINED SPACE OR IF THE BUILDING IS OF UNUSUALLY TIGHT CONSTRUCTION, PROVIDE ADEQUATE COMBUSTION AND VENTILATION AIR BY ONE OF THE METHODS DESCRIBED IN THE NATIONAL FUEL GAS CODE, ANSI Z223.1 1992, SECTION 5.3 OR APPLICABLE LOCAL CODES. Your options are: a. Rework equations adding the space of adjoin...

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