Installation Guide Manual

along with the K-factor of the VAV terminal unit are used to calculate the
airflow through the VAV unit.
Occupancy
sequence
A SimplyVAV controller is designed to operate as a stand-alone controller
and determine occupancy based only on the availability of primary airflow
and motion in the zone. The controller can be in any one of the following
occupancy states.
Occupied on page 59
Unoccupied
Standby
Occupancy can also be commanded by another BACnet device or an operator
workstation connected the building automation network. See the topic System
integration and networking on page 71 for details.
Automatic occupancy
If Automatic Occupancy is enabled, the controller will automatically toggle
between Unoccupied, Occupied, and Standby based on the presence of primary
airflow and motion in the zone.
The default for Automatic Occupancy is Disabled. See the topic Advanced
options on page 37 to change Automatic Occupancy.
Occupied
For controllers without a connected motion sensor, the controller changes to
Occupied upon the detection of primary airflow.
Controllers with a connected motion sensor change to Occupied upon the
detection of primary airflow and motion in the space. The unit will remain in
the Occupied state as long as periodic motion is detected and primary airflow
continues. If motion stops, the controller changes to Standby.
Unoccupied
The controller Occupancy mode changes to Unoccupied when it detects a loss
of primary airflow. While in the Unoccupied state, the controller will fully
open the damper in an attempt to reach the maximum airflow setpoint.
Loss of primary airflow is defined as less than 25% of the requested flow for
at least 5 minutes. The Occupancy mode changes to Occupied or Standby once
the actual airflow is at least 30% of the requested flow.
Standby
In units with a connected motion sensor, the controller starts in Standby and
changes to Occupied after detecting motion in the space. Motion in the space is
SimplyVAV Section 7: Sequences of operation
Revision E 59