Application

Room Functions
Room Coordination Functions for HVAC
41
Siemens Industry, Inc.
Application Note
A6V11692055
Smart Infrastructure – Building Products
2019-04-01
Enum
PltOpMod
Plant Mode
Purpose
Action of Mechanical
Equipment
Trigger(s)
unoccupied period.
Ventilation reduced or off
selected by configuration.
4
Pre-Comfort
Conserve energy for brief
unoccupied periods.
Configurable. Example: Shut
off ventilation for conference
rooms that are unoccupied
during the normally occupied
daytime hours.
schedule/ occ sensor
5
Comfort
Provide room air conditions
suitable for room occupancy.
All space conditioning
equipment runs in
“automatic” to maintain
desired space conditions
during occupancy.
schedule/ occ sensor or
comfort button from room
operating unit
6
Warm-up
Return to comfort conditions
before occupancy
Mechanical heating
equipment starts before
occupancy period begins.
Comfort setpoints apply for
temperature. Ventilation may
be off.
central command
7
Cool-down
Return to comfort conditions
before occupancy
Cooling equipment starts
before occupancy period
begins. Comfort setpoints
apply for temperature.
Ventilation may be off.
central command
8
Room temp. (frost) prot.
Avoid damage in room by
applying heat at high priority,
overriding errant commands
from outside the application
not used in VAV
9
Equipment temperature
protection
Avoid damage to equipment,
such as frozen coils
not used in VAV
10
Free cooling
Overcool past current
demand to store energy
Pre-cool building or zones
beyond current setpoint
during advantageous
periods, storing energy in the
thermal mass to reduce the
need for cooling later.
central command
11
Night cooling
Prevent build-up of heat in
interior spaces during
unoccupied hours.
Cooling using 100% outside
air during night time.
central command
12
Rapid ventilation
Clear contaminated air with
temporary high primary
airflow
Supply air flow goes to the
max ventilation value. Temp
control continues according
to room op mode.
manual command from room
unit
14
Fire (EmgOff)
Isolate fire and smoke,
preventing spread through
the ventilation system
Supply air damper closes.
Exhaust air damper closes.
External command to fire
mode object.
15
Smoke Positive press.
Oppose infiltration of smoke
to room from surrounding
spaces
Supply flow goes to a
configured level. Extract
damper closes.
External command to fire
mode object.
16
Smoke Negative press.
Oppose exfiltration of smoke
from room to surrounding
spaces
Extract flow goes to a
configured level. Supply
damper closes,
External command to fire
mode object.
17
Smoke Purge
Clear smoke from the
building after a fire
Supply flow goes to largest
of configured limits. Extract
tracks normally.
External command to fire
mode object.