Helpful Plumbing Terms A-B

A.C.
 Alternate Current - Electrical supply in which the polarity of the hot wire  reverses rapidly
 
AGA
 American Gas Association
 
Ambient Temperature
  Average temperature of the atmosphere in the vicinity of an appliance
 
Ampere
 Unit of measure of current flow
 
Anode Rod
 A sacrificial rod composed of one or more metals installed in the  water heater that protects the tank
 from corrosion helping extend the life of  the tank
 
Anti Scald Valve
 Device used to prevent high water temperature
 
ASHRAE
 American Society of Heating Refrigeration Air Conditioning Engineers
 
ASME
 American Society of Mechanical Engineers
 
Atmospheric Combustion
 takes place when gaseous, liquid or solid fuels react at an  elevated temperature with oxygen by burning, thus releasing heat
 
Back Flow
 When water travels from one system back into any part of the main  distribution system

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