Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| log |
1. record of events and data pertinent to a
machine operation.
2. printout of the status of all points in a
system.
3. periodic printed summary of operating data.
See also data logging. |
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| logic | 1. science of dealing with the criteria or
formal principles of reasoning and thought.
2.
systematic scheme which defines the interactions of signals in the design of an
automatic data-processing system.
3.
basic principles and application of truth tables and interconnection between
logical elements required for arithmetic computation in an automatic
data-processing system. |
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| logical decision | choice or ability to choose between
alternatives. This amounts to an answer yes or no to a question of equality or
relative magnitude. |
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| logical flowchart |
detailed statement of the work order in terms of
logic, or built-in operations and characteristics, of a specified machine.
Concise symbolic notation is used to represent the information and describe the
input, output, arithmetic, and logical operations by use of a standard set of
block symbols. A coding process normally follows a logical flowchart |
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| loop |
1. sequence of instructions that is repeated
until a terminal condition prevails.
2.
communications circuit between two private subscribers or between a subscriber
and a local switching center.
3. electric circuit containing a complete,
continuous path as in a feedback loop. |
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| loss of head |
pressure loss expressed by the height of a
column of the fluid |
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| loss-of-charge protector |
1.
device which is capable of discerning the loss of refrigerant charge in a
refrigerating machine and of reacting to protect the apparatus from motor
burnout. 2. splitting of a dry condensate line to permit
vapors to pass above and condensate to pass below an obstruction |
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| louver |
1.
assembly of sloping vanes intended to permit air to pass through and to inhibit
transfer of water droplets; outdoors, to shed rain. 2. device comprising multiple blades which, when
mounted in an opening, permits the flow of air but inhibits entrance of other
elements in a reverse direction |
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| low pressure side (low side) |
1.
portion of a refrigerating system operating at approximately the evaporator
pressure. 2. suction side |
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| low pressure stage |
compression stage from a low to an intermediate
pressure level |
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