Installation & Operation Manual - Model AVC5000
Contents of this Manual are Subject to Change Without Notification
Page 4
SECTION 1 - INTRODUCTION
The AVC product family integrates a high performance controller with the revolutionary award
winning AccuValve
®
product. The Engineers at Accutrol have used technology and innovation
to make the AVC AccuValve
®
not only the most advanced airflow control valve in the industry,
but also the most reliable and intuitive airflow control valve available.
1.1
Theory of Operation (Reference the Diagram Below)
The AccuValve
®
divides the airflow into two equal chambers using an airfoil shaped
compression section. Each chamber is comprised of a vortex shedding airflow sensor, a
modulating control blade and a static regain section. As air enters the chambers it accelerates
and compresses, creating an ideal zone for measuring airflow velocity. The vortex shedding
airflow sensors provide a highly repeatable digital pulse-train with a frequency that is directly
proportional to the air flow velocity in each chamber of the AccuValve
®
.
The digital pulses generated by each vortex shedding sensor are used to calculate the total
airflow volume flowing through the AccuValve
®
at all times. The airflow measurement provides
closed-loop feedback to the ePI
®
controller which modulates the valve actuator to maintain the
desired airflow set point. The airflow set point can be provided from either, analog input,
digital input, communications over BACnet MS/TP or AVC internal program memory. The AVC
also provides analog output signals and alarm outputs which can be used to indicate abnormal
airflow conditions.
For network communications, the AVC provides an EIA-485 port supporting BACnet MS/TP as a
Full Master Node state machine. Field programming is accomplished through the intuitive PC-
based tool
referred to as the AVC “Insight”.
Connection between the AVC and computer is
provided through a USB port located on the AVC control module.
