Application

Room Segment Functions
Device Control Functions HVAC
52
Siemens Industry, Inc.
Application Note
A6V11692042
Smart Infrastructure – Building Products
2019-04-01
Device
mode
Duct 1
Duct 2
ctrl.air flow
setp
(common setpoint for both ducts)
(common setpoint for both ducts)
Heating Coil Device Mode
The device mode for the Heating coil position (HclDevMod) is a multistate value
that supports the following states:
⚫ Off
⚫ Control mode (modulation)
⚫ Fully open
Device Control Functions HVAC
The following sections describe the main features of the room segment application
functions in a preloaded template, and include the most important parameters and
configuration objects for each AF. For the complete list of all configuration items
found in a specific template or type, refer to the Application help in ABT Site.
Note
A small number of configuration objects/parameters in preloaded templates have
values that are slightly different from raw factory default (that is, the values found
in an unconfigured HVAC "type" in the ABT Site library).
Dual Duct VAV Supply Air Dampers with 2-inlet
pressure sensors
For each supply duct, the application function uses a differential pressure sensor,
duct area, and an internal airflow controller to separately modulate the VAV supply
damper for temperature control and ventilation purposes. The main output is an
analog output (in percent) for damper position (VavSuPos1 and VavSuPos2 ) that is
generated by each PID airflow controller in this AF.
NOTE:
To calculate each air volume flow, this AF uses separate duct area calculations,
airflow coefficients and inputs from differential pressure sensors.
Main features:
⚫ VAV supply damper modulation (2) for dual duct temperature and ventilation
control
⚫ Two inlet flow sensors
⚫ Air volume flow setpoint calculation (2)
⚫ Air volume flow calculation (2)
⚫ Selectable ducts for hot air or cold air (hot, cold, or neither)
⚫ Mixing control or snap acting control