CSA ANSI Z83.18:2015 pdf free download – Recirculating direct gas-fired industrial air heaters
Baffle — an object placed in an appliance to change the direction of or retard the flow of air, gas-air mixtures, or flue gases. Body — the principal structure of the appliance, including supporting frame. BTU/Btu — abbreviation for British Thermal Unit. The quantity of heat required to raise the temperature of 1 pound of water 1 °F. Burner — a device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone. Burner, automatically lighted — one where gas to the main burner is normally turned on and ignited automatically. Burner manifold — piping and orifice(s) downstream from the modulating valve. Burner profile opening — the required free area surrounding the burner in which the appliance fan pushes or pulls air through the appliance at a selected velocity. Burner profile plate(s) — an adjustable means of changing or setting the burner profile opening. Profile plates can be fixed adjustable, remote adjustable, or of the modulating type as dictated by the appliance design requirements.
Combustion products — constituents resulting from the combustion of a fuel gas with the oxygen of the air, including the inerts, but excluding excess air. Condensate (condensation) — the liquid that separates from a gas (including flue gases) due to a reduction in temperature. Controls — devices designed to regulate the gas, air, water, or electrical supplies to a gas appliance. These may be manual, semi-automatic, or automatic. Combustion control — a control that automatically regulates the firing rate at predetermined air- fuel ratios in accordance with load demand. High-low firing — the action of a combustion control that positions the air and fuel supply for low-fire and for high-fire in accordance with load demand. Modulating — the action of a combustion control that gradually varies the air and fuel supplies within limits in accordance with load demand. Limit control — an automatic control responsive to changes in liquid level; in fuel, steam, or air pressures; in air, gas, or liquid flow; or in temperature; for limiting the operation of the controlled equipment. Operating control — a control, other than a safety control or interlock, to start or regulate burner firing according to load demand and to stop or regulate firing on satisfaction of demand or upon reaching normal temperature or pressure in the appliances being fired. Operating controls may also actuate auxiliary equipment. Primary safety control — a control responsive directly to flame properties; sensing the presence of flame and causing fuel to be shut off in the event of ignition or flame failure requiring manual reset. Cubic foot of gas — the amount of gas that would occupy 1 ft 3 when at a temperature of 60 °F, if saturated with water vapor, and under a pressure equivalent to that of 30 in Hg.