Application

3
Siemens Industry, Inc.
Application Note, App 2922
140-1301
2015-07-07
Table of Contents
Overview ............................................................................................................................. 5
Hardware Inputs .................................................................................................................. 6
Hardware Outputs ................................................................................................................ 7
Ordering Notes .................................................................................................................... 7
Sequence of Operation ..................................................................................................... 8
Pressurization Control ......................................................................................................... 8
Optional Rate Limiting of Actuators ..................................................................................... 8
Room Airflow Balance ....................................................................................................... 10
Occupancy ......................................................................................................................... 10
Active Flow Minimums and Maximums ............................................................................. 11
VAV versus CV Control ..................................................................................................... 12
Fume Hood Flow Input ...................................................................................................... 12
Flow Tracking – Supply Tracks Exhaust vs. Exhaust Tracks Supply ................................ 13
Calculating Exhaust Flow Setpoint .................................................................................... 14
Calculating Supply Flow Setpoint ...................................................................................... 15
External Flow Values ......................................................................................................... 15
Ventilation – VAV Mode ..................................................................................................... 16
Ventilation Setback in VAV Mode ...................................................................................... 16
Ventilation – Constant Volume Mode ................................................................................ 16
AVS Calibration ................................................................................................................. 17
Airflow Control ................................................................................................................... 17
Venturi Air Valve Calibration (Mode 1, 3) .......................................................................... 19
Table Access Feature (Mode 1, 3) .................................................................................... 20
Venturi Table Evaluation and Editing (Mode 1, 3) ............................................................. 22
PID Only (Mode 2) ............................................................................................................. 26
Open Loop (Mode 3) .......................................................................................................... 26
Operating Without a Supply or Exhaust ............................................................................ 28
Heating Safety ................................................................................................................... 28
Room Temperature and Setpoint ...................................................................................... 29
Room Temperature Offset ................................................................................................. 29
Room Unit Identification ..................................................................................................... 30
Room Unit Operation ......................................................................................................... 30
Sensor Select ..................................................................................................... 30
Room CO2.......................................................................................................... 31
Room RH ............................................................................................................ 31
Temperature Control Loop ................................................................................................. 31
Alarms ............................................................................................................................ 33
Ventilation Alarm ................................................................................................ 33
Pressurization Alarm .......................................................................................... 34