CSA ANSI Z21.42-13:2018 pdf free download – Gas-fired illuminating appliances
Diaphragm type automatic valve — a device consisting essentially of an automatic valve, actuated by means of the application of gas pressure upon a flexible diaphragm. Electric type automatic valve — a device actuated by electrical energy for controlling the gas supply. Excess air — air which passes through the combustion chamber and the appliance flues in excess of that which is required for complete combustion. Flame check — a gauze, grid, or any other portion of the burner assembly used to avert a flash back. Flue gases — products of combustion and excess air. Flue outlet (vent) — the opening provided in an appliance for the escape of the flue gases. Foot-candle — a unit of illumination, being the direct illumination on a surface everywhere one foot from a uniform point source of one international candle. Heating value (total) — the number of British Thermal Units produced by the combustion at constant pressure of 1 cubic foot of gas when the products are cooled to the initial temperature of the gas and air, when the water vapor formed during combustion is condensed, and when all the necessary corrections have been applied. Input rating — the gas-burning capacity of an appliance in Btu per hour as specified by the manufacturer. Appliance input ratings are based on sea level operation and need not be changed for operations up to 2,000 feet elevation. For operation at elevations above 2,000 feet, input ratings should be reduced at the rate of 4 percent for each 1,000 feet above sea level.
Latching type valve — a manual gas valve which requires at least two separate actions or movements to turn on the valve, as for example, pushing in on the valve handle to “unlatch” the valve before the valve handle can be rotated to turn on the gas. Liquefied petroleum gases — the terms “Liquefied Petroleum Gases,” “LPG” and “LP-Gas” as used in this standard shall mean and include any material which is composed predominantly of any of the following hydrocarbons, or mixtures of them; propane, propylene, butanes (normal butane or isobutane) and butylenes. LP gas-air mixtures — liquefied petroleum gases distributed at relatively low pressures and normal atmospheric temperatures which have been diluted with air to produce desired heating value and utilization characteristics. Manifold — the conduit of an appliance which supplies gas to the individual burner(s). Mantle — a lacelike hood or envelope of some refractory material which, when placed over a flame, gives light by incandescence. Mixer — the combination of mixer head, mixer throat and mixer tube. Mixer head — that portion of an injection type burner, usually enlarged, into which primary air flows to mix with the gas stream. Mixer throat — that portion of the mixer which has the smallest cross-sectional area and which lies between the mixer head and the mixer tube. Mixer tube — that portion of the mixer which lies between the throat and the burner head.