Application

Room Functions
Room Coordination Functions for HVAC
40
Siemens Industry, Inc.
Application Note
A6V11692055
Smart Infrastructure – Building Products
2019-04-01
– HVAC:
The Maximum tolerance for manually shifting the room temperature
setpoint can be configured. Fan speed and room operating mode: No
configuration. Their values cannot exceed the automatic values.
– Lighting and shading:
No configuration. Lighting setpoints and shading positions cannot be less
energy efficient than the automatic values.
⚫ The manual changes and overrides initiated by the room occupant can be
cleared, and the GreenLeaf status and GreenLeaf icon on the room operator
unit can be externally reset to green by setting the multistate BACnet object
Energy efficiency indication room (REei) to Excellent (5) at Priority 13.
Configuration
Parameters
Switch-on delay can be configured to smooth changes to the energy efficiency
state:
Description
Parameter
Default value
Switch-on delay before energy efficiency indication → provides a
delay before the LED GreenLeaf indicator changes color
See also HVAC GreenLeaf [➙ 42]
DlyOnEeiInd
5 [s]
Room Coordination Functions for HVAC
Plant Operating Mode for VAV
The application function selects the HVAC plant operating mode (PltOpMod) and
considers the room operating mode, presence detection, HVAC presence mode and
window contact. Warmup and cool down request signals are received using the
central operating system (e.g., Scheduler).
The VAV application templates support 17 different plant modes. The plant modes
are provided to cover a wide variety of room applications.
NOTE:
If a specific plant mode is not used, it should not be enabled.
Enum
PltOpMod
Plant Mode
Purpose
Action of Mechanical
Equipment
Trigger(s)
1
Off
Shutdown all heating,
cooling and ventilation.
All mechanical equipment
turns off.
manual command, or initial
startup
2
Building Protection
Conserve energy in long term
vacancy. To protect
mechanical equipment from
freezing or other adverse
conditions.
manual command or
schedule
3
Economy
Conserve energy during daily
Night setback/setup during
unoccupied hours.
schedule/ occ sensor