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G
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Galvanic
Action – The corroding action of
two unlike metals due to electrical current passing between them. |
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Gas - The vapor state of a material. |
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Gas,
Non-condensable - Gas that will not form into a liquid under the
operating pressure-temperature conditions. |
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Gas
Valve – A device for starting, stopping, or regulating flow of gas. |
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Gas
Regulator – A device for the regulation of gas. |
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Gasket
– A material used to form a leak proof seal between 2 parts. |
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Gasket,
Foam - Joint sealing material made of rubber or plastic foam strips. |
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Gauge - An instrument to measure pressure
or Fluid levels. |
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Gauge,
High Pressure - Used for pressure ranges from 0 psig to 500 psig
1101.3 kPa to 3 600 kPa. |
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Gauge,
Low Pressure - Used for pressure ranges from 0 psia to 50 psia 10 kPa to
350 kPa. |
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Gauge
Manifold - A Chambered device constructed to hold both compound and
high-pressure gauges. Valves control flow of fluids through it. |
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Gauge
Port – A connection in a system to provided for a service technician
to install a gauge. |
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Gauge
Vacuum – An Instrument used to measure pressures below atmospheric
pressure. |
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Geothermal Energy - Heat energy stored in
the earth's crust by the absorption of solar energy and by conduction with
the earth's hot interior. |
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Glide - The temperature difference
between the starting and ending temperatures of a phase change within a
system, exclusive of any subcooling or superheating. |
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Glycerol - Is a lubricant but has found
little because of its tendency to rapidly absorb moisture. |
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Grain
- Unit of weight and equal to 1/7000 lb. It is used to indicate the
amount of moisture in the air. |
| Gravity Cooling - Evaporator does not have
a fan to distribute the air.
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| Gravity Heating- heat is distributed
by gravity this king of unit has no fan.
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Grille
- A cover or louvered opening placed in a room at the end of an air
passageway. |
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Grommet
- Plastic, metal, or rubber doughnut-shaped protectors which line holes
where wires or tubing pass through panels. |
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Ground,
Short circuit – A Fault in an electrical circuit allowing electricity
to flow to ground. |
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Ground
Coil - Heat exchanger buried in the ground. May be used either as an
evaporator or as a condenser. |
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Ground Loop - A series of heat exchange
pipes which are buried either vertically
or horizontally in the earth.
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Ground Source - A refrigeration system which
utilizes the earth as it's source of energy. |
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Ground
Wire – An electrical wire that will safely conduct electricity from a
structure into the ground. |
 
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