Page 563 - 2018_IRC

FUEL GAS

first requires the removal or movement of a panel, door or AUTOMATIC IGNITION. Ignition of gas at the burner(s)
similar obstruction (see also “Ready access”). when the gas controlling device is turned on, including reig-
nition if the flames on the burner(s) have been extinguished
AIR CONDITIONER, GAS-FIRED. A gas-burning, auto-
matically operated appliance for supplying cooled air, dehu- by means other than by the closing of the gas controlling
midified air, or both, or chilled liquid. device.
BAROMETRIC DRAFT REGULATOR. A balanced
AIR CONDITIONING. The treatment of air so as to control
simultaneously the temperature, humidity, cleanness and dis- damper device attached to a chimney, vent connector, breech-
tribution of the air to meet the requirements of a conditioned ing or flue gas manifold to protect combustion appliances by
space. controlling chimney draft. A double-acting barometric draft
regulator is one whose balancing damper is free to move in
AIR, EXHAUST. Air being removed from any space or either direction to protect combustion appliances from both
piece of equipment or appliance and conveyed directly to the excessive draft and backdraft.
atmosphere by means of openings or ducts.
BOILER, LOW-PRESSURE. A self-contained appliance
AIR-HANDLING UNIT. A blower or fan used for the pur- for supplying steam or hot water.
pose of distributing supply air to a room, space or area. Hot water heating boiler. A boiler in which no steam is
AIR, MAKEUP. Any combination of outdoor and transfer generated, from which hot water is circulated for heating
air intended to replace exhaust air and exfiltration. purposes and then returned to the boiler, and that operates
at water pressures not exceeding 160 pounds per square
ALTERATION. A change in a system that involves an inch gauge (psig) (1100 kPa gauge) and at water tempera-
extension, addition or change to the arrangement, type or pur- tures not exceeding 250ºF (121ºC) at or near the boiler
pose of the original installation. outlet.
ANODELESS RISER. A transition assembly in which plas- Hot water supply boiler. A boiler, completely filled with
tic piping is installed and terminated above ground outside of water, which furnishes hot water to be used externally to
a building. itself, and that operates at water pressures not exceeding
APPLIANCE. Any apparatus or device that utilizes a fuel or 160 psig (1100 kPa gauge) and at water temperatures not
a raw material as a fuel to produce light, heat, power, refriger- exceeding 250ºF (121ºC) at or near the boiler outlet.
ation or air conditioning. Also, an apparatus that compresses Steam heating boiler. A boiler in which steam is gener-
fuel gases. ated and that operates at a steam pressure not exceeding 15
APPLIANCE, AUTOMATICALLY CONTROLLED. psig (100 kPa gauge).
Appliances equipped with an automatic burner ignition and BONDING JUMPER. A conductor installed to electrically
safety shutoff device and other automatic devices, that connect metallic gas piping to the grounding electrode sys-
accomplish complete turn-on and shutoff of the gas to the tem.
main burner or burners, and graduate the gas supply to the
burner or burners, but do not affect complete shutoff of the BRAZING. A metal-joining process wherein coalescence is
gas. produced by the use of a nonferrous filler metal having a
melting point above 1,000ºF (538ºC), but lower than that of
APPLIANCE, FAN-ASSISTED COMBUSTION. An the base metal being joined. The filler material is distributed
appliance equipped with an integral mechanical means to between the closely fitted surfaces of the joint by capillary
either draw or force products of combustion through the com- action.
bustion chamber or heat exchanger.
BTU. Abbreviation for British thermal unit, which is the
APPLIANCE, UNVENTED. An appliance designed or quantity of heat required to raise the temperature of 1 pound
installed in such a manner that the products of combustion are (454 g) of water 1ºF (0.56ºC) (1 Btu = 1055 J).
not conveyed by a vent or chimney directly to the outside BURNER. A device for the final conveyance of the gas, or a
atmosphere. mixture of gas and air, to the combustion zone.
APPLIANCE, VENTED. An appliance designed and Induced-draft. A burner that depends on draft induced by
installed in such a manner that all of the products of combus- a fan that is an integral part of the appliance and is located
tion are conveyed directly from the appliance to the outside downstream from the burner.
atmosphere through an approved chimney or vent system.
Power. A burner in which gas, air or both are supplied at
APPROVED. Acceptable to the code official. pressures exceeding, for gas, the line pressure, and for air,
APPROVED AGENCY. An established and recognized atmospheric pressure, with this added pressure being
agency that is regularly engaged in conducting tests, furnish- applied at the burner.
ing inspection services or furnishing certification, where such CHIMNEY. A primarily vertical structure containing one or
agency has been approved by the code official. more flues, for the purpose of carrying gaseous products of
ATMOSPHERIC PRESSURE. The pressure of the weight combustion and air from an appliance to the outside atmo-
of air and water vapor on the surface of the earth, approxi- sphere.
mately 14.7 pounds per square inch (psia) (101 kPa absolute) Factory-built chimney. A listed and labeled chimney
at sea level. composed of factory-made components, assembled in the

538 2018 INTERNATIONAL RESIDENTIAL CODE ®
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