Application

Room Functions
Room Coordination Functions for HVAC
42
Siemens Industry, Inc.
Application Note
A6V11692053
Smart Infrastructure – Building Products
2019-04-01
The Table below shows the different room and central BAS functions that
determine the plant mode for the VAV application templates.
NOTE:
If an input is not configured in the application, it is NOT USED in determining the
plant mode state.
IF
THEN
Room operating
mode
Presence
detection
(Room Comfort
Button)
Window contact
(Room)
Night cooling
signal
(from
Scheduler)
Cool down
signal
(from
Scheduler)
Warm-up signal
(from
Scheduler)
Plant mode
-
-
Open
-
-
-
Protection
Protection
-
Closed
-
-
-
Protection
Economy
-
Closed
False
False
False
Economy
-
Closed
True
False
False
Night cooling
-
Closed
-
-
True
Warm-up
-
Closed
-
True
False
Cool down
Pre-Comfort
-
Closed
-
True
-
Cool down
-
Closed
-
False
-
Pre-Comfort
Present
Closed
-
-
-
Comfort
Absent
Closed
-
False
-
Pre-Comfort
Absent
Closed
-
True
-
Cool down
Comfort
-
Closed
-
-
-
Comfort
Present
Closed
-
-
-
Comfort
Absent
Closed
-
False
-
Pre-Comfort
Absent
Closed
-
True
-
Cool down
Present
Closed
-
-
-
Rapid Ventilation
HVAC GreenLeaf
Overview
The application function HVAC green leaf, energy efficiency (HvacGrnLf11)
determines if manual user operations influence HVAC energy efficiency, and
manages the return to normal (energy efficient) state after receiving the reset
request.
Inputs:
The main inputs for HVAC determining energy efficiency are:
⚫ Setpoint shift configurable limit and heating/cooling status (using internal
connection).
– The leaf icon on the room operator unit turns red if the user shifts the
setpoint greater than the maximum configurable tolerance (TRShft >
TolMaxSpTRShft).