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• APPLIANCE - Device to convert gas into energy; term
includes any component, control, wiring, piping or tubing
required to be part of the device.
• ANSI - American National Standards Institute, Inc. over
see's creation and maintenance of voluntary consensus
standards, including ANSI Z21.13/CSA 4.9: Gas-Fired Low
Pressure Steam and Hot Water Boilers.
• ASME - Association of Mechanical Engineers
Establishes rules of safety governing the design, fabrication,
and inspection of boilers and pressure vessels, determining
the MAWP of such vessels.
• ASTM - American Society for Testing and Materials.
ASTM International is one of largest voluntary standards
development organizations in world trusted source for
technical standards for materials, products, systems, and
services. Known for their high technical quality and market
relevancy, ASTM International standards have important
role in information infrastructure that guides design,
manufacturing and trade in the global economy.
• AUTHORITY HAVING JURISDICTION - Individual or
organization adopting and enforcing codes, rules, and by-
laws governing various concerns of community. Commonly
referred to as "final authority" for any matters relating
to LIFE SAFETY and BUILDING CONSTRUCTION within a
community.
• BOILER - Appliance intended to supply hot liquid for space-
heating, processing or power purposes.
• BTU - Abbreviation for British Thermal Unit. Quantity of heat
required to raise temperature of 1 pound of water 1°F.
• BURNER - Device for final conveyance of gas or mixture of
gas and air, to combustion zone.
• CALIBRATE - Make fine adjustments or divide into marked
intervals for optimal measuring.
• COAXIAL VENTING Sharing the same center.
• COMBUSTION - Rapid oxidation of fuel gases accompanied
by production of heat or heat and light. Complete combustion
of fuel is possible only in presence of adequate supply of
Oxygen.
• COMBUSTIBLE MATERIAL - Materials made of or surfaced
with wood, compressed paper, plant fibers, or other
materials capable of being ignited and burned. Such
material shall be considered combustible even though flame-
proofed, fire-retardant treated, or plastered.
• COMBUSTION AIR - Air that is drawn into an appliance to
mix with fuel and support combustion.
• CONDENSATE - Liquid separated from flue gas due to
reduction in temperature.
14 - GLOSSARY
• DIRECT VENT BOILER - Boiler constructed and installed so
all combustion air is derived directly from outdoors and all
vent gases are discharged to outdoors.
• DOMESTIC - Relating to household usage as opposed to
commercial usage.
• DOMESTIC WATER - Potable drinking water - tap water.
• DRAFT - Pressure difference causes gases or air to flow
through a chimney, vent, flue or appliance.
• FLA - Full load amps.
• FLUE - Enclosed passageway for conveying combustion
gases.
• FLUE GASES - Products of combustion plus excess air in
appliance flues or heat exchanger.
• GAS SUPPLIER - Party that sells commodity of Natural Gas
(Gas A) or LPG (Gas E).
• HIGH-VOLTAGE - Circuit involving potential of not more
than 600 volts and having circuit characteristics in excess of
those of low-voltage circuit.
• HYSTERESIS (DIFFERENTIAL) -difference between the
temperature at which the thermostat switches off - and the
temperature at which it switches on again.
• IGNITER - Device utilizing electrical energy to ignite gas at
main burner.
• LEAK CHECK - Operation performed on gas piping system
to verify system does not leak.
• LICENSED QUALIFIED INSTALLER / SERVICE
TECHNICIAN - any individual, firm, corporation or
company that either directly or through a representative is
engaged in the installation, replacement, repair or servicing
of gas piping, venting systems, appliances, components,
accessories, or equipment, and whose representative is
experienced and trained, in such work and has complied
with the requirements of the authority having jurisdiction.
• LOW WATER CUTOFF - Device constructed to automatically
cut off fuel supply when surface of water in boiler falls to
lowest safe water level.
• LOW-VOLTAGE - Circuit involving potential of not more
than 30 volts.
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240012564 REV A, [05/15/2019]
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