Commissioning Instructions

Before You Begin
Setting Duct Area
8
Siemens Industry, Inc. Start-up Procedures 140-1342
Restricted 2015-11-09
Setting Duct Area
If provided, enter the duct area (sq ft or sq m) into DUCT AREA.
If you do not know the duct area, use the appropriate tool to calculate it, or use one of
the following equations to calculate it manually:
Area =
Round Duct
Rectangular Duct
Area in Sq. Ft.
(Dimensions in inches)
π x R
2
/144
(where R = radius of duct)
Width x Height/144
Area in Sq. M
(Dimensions in centimeters)
π x R
2
/10,000
(where R = radius of duct)
Width x Height/10,000
NOTE:
When entering the controller definition for a controller at the field panel, do not enter a
duct area. (Choose
N
for none when prompted for the duct shape.) This controller
does not send the value of air volume to the field panel in velocity (fpm). Instead, it
uses volume (cfm) so a conversion is not necessary.
Setting Airflow Sensing Input
The controller allows the exhaust volume to be measured in several different methods.
 Differential pressure on AVS-1 (default)
 Differential pressure signal on AI3
 Linear flow signal on AI3
When not using the default method, refer to the
Setting Airflow Input Type section.
Setting Flow Coefficients
CAUTION
It is extremely important that the flow readings are accurate.
Inaccurate flow readings will cause control problems.
NOTE:
The Laboratory Room Exhaust Air Terminal Technical Specification Sheet (149-320),
has a full listing of the latest coefficients for multiple setups. Those coefficient values
are initial values only. Actual values must be verified by the balancer.
NOTE:
Make sure the airflow sensors are calibrated before determining flow coefficients.
This is done by setting CAL AIR to
YES
and waiting for it to switch back to NO on its
own.