Évaluations - 2, GPA: 3.5
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Facilité d'utilisation
Definition of Appliance Categories Boilers are divided into four categories based on the pressure produced in the exhaust and the likelihood of condensate production in the vent. Category I. A boiler which operates with a non-positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent. Category II. A boiler which operates with a non-positive vent static pressure and with a vent gas temperature that may cause excessive condensate production in the vent. Category III. A boiler which operates with a positive vent pressure and with a vent gas temperature that avoids excessive condensate production in the vent. Category IV. A boiler which operates with a positive vent pressure and with a vent gas temperature that may cause excessive condensate production in the vent. See Table J-1 for vent category requirements for the Advanced Design Boiler Note: For additional information on appliance categorization, see appropriate ANSI Z21 Standard and the latest edition Standard of National Fuel Gas Code or in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of local building codes. Determination of Appliance Category for Venting Purposes and Venting Arrangements WARNING: Contact the manufacturer of the vent material if there is any question about the appliance categori zation and suitability of a vent material for application on a Category III or IV vent system. Using improper venting materials can result in personal injury, death or property damage. 27 Table J-1 ADB Category Determination for Venting Purpose and Venting Arrangement 28 A D B V E N T I N G A R R A N G E M E N T S Table J-1 ADB Category Determination for Venting Purpose and Venting Arrangement 28 A D B V E N T I N G A R R A N G E M E N T S NOTE: PVC or CPVC vent maybe Contact manufacturer for details. Support of Vent Stack The weight of the vent stack or chimney must not rest on the boiler vent connection. Support must be provided in compliance with applicable codes. The vent should also be supported to maintain proper clearances from combustible materials. Use insulated vent pipe spacers where the vent passes through combustible roofs and walls. Vent Terminal Location NOTICE: During winter months check the vent cap and make sure no blockage occurs from build up of snow. Condensate can freeze on the vent cap. Frozen condensate on the vent cap can result in a blocked flue condition. Give special attention to the location of the vent termination to avoid possibility of property damage or personal injury. a) Gases may form a white vapor plume in winter. The plume could obstruct a window view if the termination is installed in close proximity to windows. b) Prevailing winds could cause freezing of condensate and water/ice buildup on building, plants or roof. c) The bottom of the vent terminal and the air intake shall be located at least 12 inches above grade, including normal snow line. d) Un-insulated single-wall metal vent pipe shall not be used outdoors on cold climates for venting gas utilization equipment. e) Through-the-wall vents for Category II and IV appliances and non-categorized condensing appliances shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief valves, or other equipment. Where local experience indicates that condensate is a problem with Category I and III appliances, this provision shall also apply. f) Locate and guard vent termination to prevent accidental contact by people and pets. g) DO NOT terminate vent in window well, stairwell, alcove, courtyard or other recessed area, unless previously approved by local authority. h) DO NOT terminate above any door, window, or gravity air intake. Condensate can freeze causing ice formations. i) Locate or guard vent to prevent condensate from damaging exterior finishes. Use a 2’ x 2’ rust resistant sheet metal backing plate against brick or masonry surfaces. j) DO NOT extend exposed vent pipe outside of building. Condensate could freeze and block vent pipe. k) Multiple direct vent installations require a four (4) foot clearance between the vent caps, center to center. U.S. Installations- Refer to latest edition of the National Fuel Gas Code. Vent termination requirements are as follows: a) Vent must terminate at least four (4) feet below, four (4) feet horizontally, or one (1) foot above any door, window or gravity air inlet to the building. b) The vent must not be less than seven (7) feet above grade when located adjacent to public walkways. c) Terminate vent at least three (3) feet above any forced air inlet located within ten (10) feet. d) Vent must terminate at least four (4) feet horizontally, and in no case above or below unless four (4) feet horizontal distance is maintained, from electric meters, gas meters, regulators, and relie...
Ce manuel est également adapté pour les modèles :Chauffe-eau - 1000 (3.22 mb)
Chauffe-eau - 750 (3.22 mb)