Assortment / System Description

Room pressurization and fume hood control
Pressurized room, temperature control
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21.7.6 Presence control
The HVAC application can also be controlled by presence through the use of a
presence detector.
The HVAC application can be configured for each room to react to the presence
signal for each room according to the room operating mode.
The application is programmed to respond to presence and absence of
occupants in the room. Occupancy includes scheduled and unscheduled use of
the room. BAS scheduling features drive the room operating mode to
accommodate scheduled use. An optional presence detector can accommodate
unscheduled use. The two sources of data are combined to set the operating
state of the HVAC application. The combination of data from two sources is
configurable.
By default the application ignores the presence detector during Economy mode
and follows it during Comfort mode. For many critical spaces, the opposite
behavior is selected: ignore the presence detector during Comfort mode and
follow it during Economy. The applicable delays for the HVAC application in a
room can also be configured for each room.
Description Name Default value
Switching delay for presence SwiDlyPrst 5 Min
Switching delay for absence SwiDlyAbst 5 Min
21.7.7 Dynamic calibration
Dynamic calibration can be only conducted during operation with a network and
switched-on VAV system.
The DXR2 web server during commissioning is used to conduct dynamic
calibration of a VAV box. The DXR2 web server must be connected. After
logging on, a Favorites view is provided for calibration. The overview includes
all relevant parameters and the data point for automatically conducting
dynamic calibration. The following list displays an overview of the parameters
on dynamic calibration for each VAV box.
A detailed guide on dynamic calibration and a video guide are available from
the Siemens download center www.siemens.com/bt/download.