UL 17:2008 pdf download.Vent or Chimney Connector Dampers for Oil-Fired Appliances.
5.2 ElectrIcal circuits
5.2.1 The pnrnary input to a safety control circuit shall be a 2-wire, one-side-grounded system, having a voltage rating of a nominal 120 volts. A switch or protective device in the circuit shall be electrically connected to the ungrounded supply conductor.
6 Materials
6.1 The parts of a vent oi chimney connector damper assembly that serve as a passageway for the flue gases or otherwise are in direct contact with the flue gases shall be made of stainless steel, cast iron, aluminum-coated or hot-rolled steel or other metals having equivalent durability and resistance to corrosion, fire, and heat. The maximum temperature ratings of matenals are specified in Table 20.2.
6.2 With reference to 6.1. the thickness including coatings, of stainless steel shall not be less than 0.012 Inch (0.3 mm), and neither aluminum-coated nor hot-rolled steel shall be less than 0.032 Inch (0.81 mm).
6.3 Galvanized steel may be used in the same thickness and at the same temperature as hot-rolled steel. provided galvanizing is not required as a protective coating or for the reflectivity of the surface to reduce the risk of fire.
6.4 A part made of drawn brass or machined from brass rod shall withstand, without cracking. a 10-day moist ammonia air stress cracking test. See Section 28. 10-Day Moist Ammonia Air Stress Cracking Test.
7 SprIngs
7.1 A spring shall be of a material that is protected against corrosion.
7.2 It impaired operation of a spring may cause the damper blade to remain in the closed or partially closed position, the construction and application of the Spring employed shall be such that corrosion, fatigue. overstress. wear, or abrasion is not likely to impair operation of the spring nor remove it from its intended position.
5.2.1 The pnrnary input to a safety control circuit shall be a 2-wire, one-side-grounded system, having a voltage rating of a nominal 120 volts. A switch or protective device in the circuit shall be electrically connected to the ungrounded supply conductor.
6 Materials
6.1 The parts of a vent oi chimney connector damper assembly that serve as a passageway for the flue gases or otherwise are in direct contact with the flue gases shall be made of stainless steel, cast iron, aluminum-coated or hot-rolled steel or other metals having equivalent durability and resistance to corrosion, fire, and heat. The maximum temperature ratings of matenals are specified in Table 20.2.
6.2 With reference to 6.1. the thickness including coatings, of stainless steel shall not be less than 0.012 Inch (0.3 mm), and neither aluminum-coated nor hot-rolled steel shall be less than 0.032 Inch (0.81 mm).
6.3 Galvanized steel may be used in the same thickness and at the same temperature as hot-rolled steel. provided galvanizing is not required as a protective coating or for the reflectivity of the surface to reduce the risk of fire.
6.4 A part made of drawn brass or machined from brass rod shall withstand, without cracking. a 10-day moist ammonia air stress cracking test. See Section 28. 10-Day Moist Ammonia Air Stress Cracking Test.
7 SprIngs
7.1 A spring shall be of a material that is protected against corrosion.
7.2 It impaired operation of a spring may cause the damper blade to remain in the closed or partially closed position, the construction and application of the Spring employed shall be such that corrosion, fatigue. overstress. wear, or abrasion is not likely to impair operation of the spring nor remove it from its intended position.
