Glossary
24
Siemens Industry, Inc.
Owner's Manual
125-5093
Building Technologies
2015-10-14
Demand Control Ventilation
A control algorithm that provides for the control or reduction of outdoor air intake below
design rates when the actual occupancy of spaces served by the system is at less than
design occupancy.
DCV
Demand Control Ventilation.
DDC
Direct Digital Control.
Direct digital control
The automated control of a condition or process by a digital device (computer).
DO
Digital Output. Physical output point that sends a two-state signal (ON/OFF,
OPEN/CLOSED, YES/NO).
English units
The foot-pound-second system of units for weights and measurements.
equipment controller
FLN device, such as a BACnet PTEC or ATEC, that provides individual room or
mechanical equipment control or additional point capacity to a field panel.
field panel
A DDC control device containing a microprocessor for centralized control and
monitoring of system components and equipment controllers.
Floating Control
The combination of a modulating controlled device with the use of a pair of two position
outputs. The control signal will either activate one or the other outputs to drive the
controlled device towards its open or closed position. When both outputs are off, the
controlled device maintains its last position. Also referred to as tri-state control.
FLN
Field Level Network. Network consisting of equipment controllers, FLN end devices,
fume hoods, and so on.
lps
Liters per Second.
loopout
Output of the control loop expressed as a percentage.
Heat pump
An HVAC device used for both space heating and space cooling. When a heat pump is
used for heating, it employs the same basic refrigeration-type cycle used by an air
conditioner but in the opposite direction, releasing heat into the conditioned-space
rather than the surrounding environment. In this use, heat pumps generally draw heat
from the cooler external air or from the ground.
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