Application

3
Siemens Industry, Inc.
Application Note, App 2927
140-1311
2015-07-07
Table of Contents
Overview ............................................................................................................................. 5
Hardware Inputs .................................................................................................................. 6
Hardware Outputs ................................................................................................................ 7
Ordering Notes .................................................................................................................... 7
Sequence of Operation ..................................................................................................... 8
Pressurization Control ......................................................................................................... 8
Room Airflow Balance ......................................................................................................... 8
Occupancy ........................................................................................................................... 9
Active Flow Minimums and Maximums ............................................................................. 10
VAV versus CV Control ..................................................................................................... 11
Fume Hood Flow Input ...................................................................................................... 11
Flow Tracking – Supply Tracks Exhaust vs. Exhaust Tracks Supply ................................ 12
Calculating Exhaust Flow Setpoint .................................................................................... 13
Calculating Supply Flow Setpoint ...................................................................................... 14
External Flow Values ......................................................................................................... 14
Ventilation – VAV Mode ..................................................................................................... 15
Ventilation Setback in VAV Mode ...................................................................................... 15
Ventilation – Constant Volume Mode ................................................................................ 15
AVS Calibration ................................................................................................................. 15
Airflow Control ................................................................................................................... 16
Floating Control Actuation Auto-correct ............................................................................. 16
Room Temperature and Setpoint ...................................................................................... 17
Room Temperature Offset ................................................................................................. 17
Room Unit Identification ..................................................................................................... 17
Room Unit Operation ......................................................................................................... 18
Sensor Select ..................................................................................................... 18
Room CO2.......................................................................................................... 19
Room RH ............................................................................................................ 19
Temperature Control Loops ............................................................................................... 19
BTU Calculations ............................................................................................................... 19
BTU Calculations – VAV Mode .......................................................................... 19
BTU Calculations – Constant Volume Mode ...................................................... 21
Alarms ............................................................................................................................ 22
Ventilation Alarm ................................................................................................ 22
Pressurization Alarm .......................................................................................... 23
Local Annunciation ............................................................................................. 24
Network Annunciation ........................................................................................ 25
Damper Position on Return from Power Failure ................................................................ 25
Operation of AVS FAILMODE ........................................................................................... 25