VC1000 Focus Guide - ProLon

VAV Controller
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• Correction Factor: Multiplication factor used to correct the slope of the airflow sensor.
Figure 2.1.20: Correction factor
Units MIN MAX Default
N/A 0 10 1
Auto Calibrate: This calibration procedure is provided by Focus to automatically
determine the correction factor and offset that best suits your system. To perform this
function, you must be online and have a balometer ready (air flow sensor). Also, you
must have already input to the VAV Controller the correct K Factor of the flow sensor, the
duct diameter and the damper opening delay.
• Step 1: Focus overrides the damper position to 100% (or lower in case of an invalid
reading). A progress bar appears indicating the current damper position. You can
cancel the operation at any time by pressing the “Cancel” button.
Figure 2.1.21: Damper progress bar
• Step 2: With the damper now open, Focus asks you for the first balometer reading in
CFM (cubic feet per minute). The moment you click on the “Next>” button, Focus will
also retrieve the airflow reading from the VAV Controller. If you type an invalid
number, or if Focus cannot read from the VAV Controller, the operation is aborted.
Figure 2.1.22: Airflow dialog box
• Step 3: Focus overrides the damper to 20% (or greater in case of an invalid reading). A
progress bar appears indicating the current damper position. You can cancel the
operation at any time by pressing the “Cancel” button.
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