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Glossary
23
Siemens Industry, Inc. Owner's Manual 125-5093
Building Technologies 2015-10-14
Glossary
This glossary contains the collected terms and acronyms that are used in Siemens
BACnet PTEC and TEC Controllers. For definitions of point database descriptors, see
Chapter 3 - Point Database, in this manual.
airflow
Rate at which a volume of air moves through a duct. Usually expressed in cubic feet
per minute (cfm) or liters per second (lps).
algorithm
Mathematical formula and control logic that uses varying inputs to calculate an output
value.
AVS
Air Velocity Sensor. An electronic device that converts differential pressure from a pilot
tube or multi-point pickup to an analog rate of fluid flow (air velocity in fpm, m/s) to
provide calculations of air volume rate (cfm, lps) in a duct. The air velocity sensor may
be an external device or an internal component of a controller.
centralized control
Type of control offered by a controller that is connected by means of Field Level
Network (FLN).
cfm
Cubic Feet per Minute.
Chilled Beam
A cooling device that provides a cooling system by taking care of both the sensible and
latent heat gains of a room in a single package by a series of chilled water coils
mounted near or in the ceiling. Coupled with a CV or VAV terminal ventilation system,
a chilled beam induces air movement over the coil in the way that it discharges fresh
air into the room. This allows for both fresh air and cooling to be taken care of at the
same time.
control loop
An algorithm, such as PI or PID, that is used to control an output based on a setpoint
and an input reading from a sensor.
CO
2
Carbon dioxide, a naturally occurring chemical compound composed of two oxygen
atoms and a single carbon atom. Among other production sources, carbon dioxide is
produced as the result of breathing of humans and animals and can therefore be an
indirect indication of the concentration of humans in a zone.
CV
Constant air volume. Ventilation system that provides a fixed air volume supplied to
and exhausted from the rooms served. The fixed volume may be different during
occupied and unoccupied times