Installation & Operation Manual - Model AVC4000
Contents of this Manual are Subject to Change Without Notification
Page 28
6.5.9.3.4
BACnet Communications
provides a means for
setting the AVC4000 BACnet
parameters. In the lower portion of the dialog box, the Actuator Control BACnet
Priority Level is displayed along with the current status of the selected Priority
Level. Checking the “Relinquish” box will release the AVC’s priority level.
6.5.9.3.5
Volume Measurement Adjust
is a calibration tool that can be used to correlate
the airflow volume measured by the AVC4000 with a field measurement.
NOTE:
The
Equal % Cal. Adj.
is a single-step field calibration method
which does not overwrite the factory calibration of the AVC4000. Using
this function is not normally required (or advisable) and is only provided
as a tool for the Airflow Balancer to correlate the AVC airflow
measurement to a field airflow measurement. The graph below shows
the effect the Equal % Cal Adj. has over the entire operating range
.
-10% Adj.=
-100 CFM change
-10% Adj. =
-40 CFM change
1000
400
800
600
200
0
Caution:
The Equal % Cal. Adj.
should only be performed if the
field measurement is taken in
accordance with ANSI/ASHRAE
STD 111 with the minimum
requirements satisfied,
otherwise the calibration
adjustment will reduce the
accuracy of the AVC.
Factory Cal. Airflow Meas. Curve
Airflow Meas. Curve with -10% Cal. Adj.
WARNING:
By selecting
“Relinquish” the internal
control loop will not
control the actuator.
Command of the actuator
will be provided by the
highest AO1 priority level
on the BACnet network.
