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Definitions (148)
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pump down
To use the compressor to pump all of the system's refrigerant into the receiver and/or condenser prior to opening the system for service. This is also used in commercial systems to prevent refrigerant migration in the off cycle.
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80% a.f.u.e.
80% of the fuel burned is turned into heat delivered at the register. The U.S. government's established minimum AFUE rating for a furnace is 78 percent.
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ac alternating current
A heat exchanger consisting of two diagonal coils that are joined together in the shape of the letter A.
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accumulator
A storage tank located in the suction line of a compressor.
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ach
Stands for Air Changes per Hour. It is the number of times in one hour that the air in your house is completely replaced with outside air.
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acid condition
The presence of corrosive substances in a sealed refrigeration system.
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add on heat pump
Installing a heat pump in conjunction with an existing fossil fuel furnace. The result is a dual fuel system.
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a.f.u.e
A rating that reflects the efficiency of a gas furnace in converting fuel to energy. A rating of 90 means that approximately 90% of the fuel is utilized to provide warmth to your home, while the remaining 10% escapes as exhaust.
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ahu
A substance capable of causing an allergic reaction because of an individual's sensitivity to that substance
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allergic rhinitis
Inflammation of the mucous membranes in the nose that is caused by an allergic reaction.
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