Assessments - 4, GPA: 4.5
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Exhaust ducts shall be constructed of sheet metal or other noncombustible material. Such ducts must be equivalent in strength and corrosion resistance to ducts made of galvanized sheet steel not less than 0.0195 inches (0.495 mm) thick. Where the exhaust duct pierces a combustible wall or ceiling, an opening having a diameter of 4 inches (10.2 cm) larger than the diameter of the exhaust duct shall be provided, with the duct centered in the opening. When ducts pass through walls, ceilings, floors or partitions, the space around the duct shall be sealed with noncombustible material. Refer to Figures 3, 4 and 5. • Individual Venting For maximum efficiency and performance, it is preferred to exhaust tumbler(s) individually to the outdoors. At no point may the cross area of installed venting be less than the cross area of the exhaust thimble of the tumbler. The maximum allowable length venting is 14 feet (4.3 m) and two 90° elbows or equivalent. If the equivalent length of a duct required for an installation exceeds the maximum allowable equivalent length, the diameter of a round duct must be increased by 10% for each additional 20 feet (6.1 m). Cross section area of a rectangular duct must be increased by 20% for each addtional 20 feet (6.1 m). To determine equivalent venting, Refer to Table 1. DUCT DIAMETER EQUIVALENT LENGTH OF STRAIGHT DUCT 6" (15.2 cm) 8" (20.3 cm) 10" (25.40 cm) 12" (30.48 cm) 14" (35.56 cm) 16" (40.64 cm) 18" (45.72 cm) One 90° elbow = 7 feet (2.1 m) One 90° elbow = 9.3 feet (2.83 m) One 90° elbow = 11.6 feet (3.5 m) One 90° elbow = 14 feet (4.3 m) One 90° elbow = 16 feet (4.9 m) One 90° elbow = 18.7 feet (5.7 m) One 90° elbow = 21 feet (6.4 m) Equivalent Length (feet) = 1.7 x Duct Diameter (inches) Table 1 Example: A 12" diameter duct’s equivalent length of 14 feet of duct and two 90° elbows is: Equivalent Length = 14 feet + (2) 90° elbows = 14 feet + 14 feet + 14 feet = 42 feet (12.8 m) With the tumbler in operation, airflow at any point in the duct must be at least 1200 feet per minute (366 m./ min.) to insure that the lint remains airborne. 20 © Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT M414545 • Collector Venting While it is preferable to exhaust tumblers individually to the outdoors, a main collector duct may be used if it is sized accordingly. Refer to Figure 5. This illustration indicates minimum diameters, and should be increased if the collector length exceeds 20 feet (6.1 m). The collector duct may be rectangular in cross section, as long as the area is not reduced. Provisions should be made for lint removal and cleaning of the collector duct. The collector duct must be tapered. Refer to Figure 5. The individual tumbler ducts must enter the collector duct at a 45° angle in the direction of airflow. Never connect a tumbler duct at a 90° angle to the collector duct. Doing so will cause excessive back pressure, resulting in poor performance. Never connect two tumbler exhaust ducts directly across from each other at the point of entry to the collector duct. The collector system must be designed so the static back pressure measured 12 inches (30.5 cm) from the exhaust thimble does not exceed the maximum allowable pressure specified on the installation sticker on the rear of the tumbler. This must be measured with all tumblers running that are vented into the collector. MAKE-UP AIR A tumbler is forced air exhausted and requires provisions for make-up air to replace the air exhausted by the tumbler. IMPORTANT: Do not obstruct the flow of combustion and ventilation air. Recommended make-up air opening to the outside is 144 inches2 (928 cm2). At a minimum, the National Fuel Gas Code requires tumblers to have at least one square inch (6.5 sq. cm) of opening for every 1000 BTU/hr. of input rating for proper combustion. Example: A tumbler with a rated input of 120,000 BTU/hr. requires 120 square inches of free opening. The additional opening recomended by the manufacturer is required for optimum drying and reliability. Protective louvers in the opening to the outdoors can reduce air movement by approximately 40 percent. The opening must compensate for the area taken up by the louvers. The make-up air openings for a room containing tumbler(s) and/or gas fired hot water heater or other gravity vented appliances must be increased sufficiently to prevent downdrafts in any of the vents when all tumblers are in operation. Do not locate gravity vented appliances between tumbler(s) and make-up air openings. If it is necessary to duct make-up air to the tumbler(s), increase the area of the duct work by 25 percent to compensate for any restriction in air movement. M414545 © Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT 21 Solvent gases and vapors from dry cleaning machines create acids when drawn through the heater of a drying tumbler. These acids are corrosive to the drying tumbler as well as to the laundry load being dried. Be sure make-up air is free of ...
Este manual também é adequado para os modelos :Secadores - 000 BTU (2.02 mb)
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